ReleaseNotes 1.5 MB

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  1. This document summarizes new features and bugfixes in each stable
  2. release of Tor. If you want to see more detailed descriptions of the
  3. changes in each development snapshot, see the ChangeLog file.
  4. Changes in version 0.4.8.11 - 2024-04-10
  5. This is a minor release mostly to upgrade the fallbackdir list.
  6. Directory authorities running this version will now automatically
  7. reject relays running the end of life 0.4.7.x version.
  8. o Minor features (directory authorities):
  9. - Reject 0.4.7.x series at the authority level. Closes ticket 40896.
  10. - New IP address and keys for tor26.
  11. - Allow BandwidthFiles "node_id" KeyValue without the dollar sign at
  12. the start of the hexdigit, in order to easier database queries
  13. combining Tor documents in which the relays fingerprint does not
  14. include it. Fixes bug 40891; bugfix on 0.4.7 (all supported
  15. versions of Tor).
  16. o Minor features (fallbackdir):
  17. - Regenerate fallback directories generated on April 10, 2024.
  18. o Minor features (geoip data):
  19. - Update the geoip files to match the IPFire Location Database, as
  20. retrieved on 2024/04/10.
  21. o Minor bugfixes (directory authorities):
  22. - Add a warning when publishing a vote or signatures to another
  23. directory authority fails. Fixes bug 40910; bugfix on 0.2.0.3-alpha.
  24. Changes in version 0.4.8.10 - 2023-12-08
  25. This is a security release fixing a high severity bug (TROVE-2023-007)
  26. affecting Exit relays supporting Conflux. We strongly recommend to update as
  27. soon as possible.
  28. o Major bugfixes (TROVE-2023-007, exit):
  29. - Improper error propagation from a safety check in conflux leg
  30. linking led to a desynchronization of which legs were part of a
  31. conflux set, ultimately causing a UAF and NULL pointer dereference
  32. crash on Exit relays. Fixes bug 40897; bugfix on 0.4.8.1-alpha.
  33. o Minor features (fallbackdir):
  34. - Regenerate fallback directories generated on December 08, 2023.
  35. o Minor features (geoip data):
  36. - Update the geoip files to match the IPFire Location Database, as
  37. retrieved on 2023/12/08.
  38. o Minor bugfixes (bridges, statistics):
  39. - Correctly report statistics for client count over pluggable
  40. transports. Fixes bug 40871; bugfix on 0.4.8.4.
  41. Changes in version 0.4.8.9 - 2023-11-09
  42. This is another security release fixing a high severity bug affecting onion
  43. services which is tracked by TROVE-2023-006. We are also releasing a guard
  44. major bugfix as well. If you are an onion service operator, we strongly
  45. recommend to update as soon as possible.
  46. o Major bugfixes (guard usage):
  47. - When Tor excluded a guard due to temporary circuit restrictions,
  48. it considered *additional* primary guards for potential usage by
  49. that circuit. This could result in more than the specified number
  50. of guards (currently 2) being used, long-term, by the tor client.
  51. This could happen when a Guard was also selected as an Exit node,
  52. but it was exacerbated by the Conflux guard restrictions. Both
  53. instances have been fixed. Fixes bug 40876; bugfix
  54. on 0.3.0.1-alpha.
  55. o Major bugfixes (onion service, TROVE-2023-006):
  56. - Fix a possible hard assert on a NULL pointer when recording a
  57. failed rendezvous circuit on the service side for the MetricsPort.
  58. Fixes bug 40883; bugfix on 0.4.8.1-alpha.
  59. o Minor features (fallbackdir):
  60. - Regenerate fallback directories generated on November 09, 2023.
  61. o Minor features (geoip data):
  62. - Update the geoip files to match the IPFire Location Database, as
  63. retrieved on 2023/11/09.
  64. Changes in version 0.4.8.8 - 2023-11-03
  65. We are releasing today a fix for a high security issue, TROVE-2023-004, that
  66. is affecting relays. Also a few minor bugfixes detailed below. Please upgrade
  67. as soon as posssible.
  68. o Major bugfixes (TROVE-2023-004, relay):
  69. - Mitigate an issue when Tor compiled with OpenSSL can crash during
  70. handshake with a remote relay. Fixes bug 40874; bugfix
  71. on 0.2.7.2-alpha.
  72. o Minor features (fallbackdir):
  73. - Regenerate fallback directories generated on November 03, 2023.
  74. o Minor features (geoip data):
  75. - Update the geoip files to match the IPFire Location Database, as
  76. retrieved on 2023/11/03.
  77. o Minor bugfixes (directory authority):
  78. - Look at the network parameter "maxunmeasuredbw" with the correct
  79. spelling. Fixes bug 40869; bugfix on 0.4.6.1-alpha.
  80. o Minor bugfixes (vanguards addon support):
  81. - Count the conflux linked cell as valid when it is successfully
  82. processed. This will quiet a spurious warn in the vanguards addon.
  83. Fixes bug 40878; bugfix on 0.4.8.1-alpha.
  84. Changes in version 0.4.8.7 - 2023-09-25
  85. This version fixes a single major bug in the Conflux subsystem on the client
  86. side. See below for more information. The upcoming Tor Browser 13 stable will
  87. pick this up.
  88. o Major bugfixes (conflux):
  89. - Fix an issue that prevented us from pre-building more conflux sets
  90. after existing sets had been used. Fixes bug 40862; bugfix
  91. on 0.4.8.1-alpha.
  92. o Minor features (fallbackdir):
  93. - Regenerate fallback directories generated on September 25, 2023.
  94. o Minor features (geoip data):
  95. - Update the geoip files to match the IPFire Location Database, as
  96. retrieved on 2023/09/25.
  97. Changes in version 0.4.8.6 - 2023-09-18
  98. This version contains an important fix for onion service regarding congestion
  99. control and its reliability. Apart from that, unneeded BUG warnings have been
  100. suppressed especially about a compression bomb seen on relays. We strongly
  101. recommend, in particular onion service operators, to upgrade as soon as
  102. possible to this latest stable.
  103. o Major bugfixes (onion service):
  104. - Fix a reliability issue where services were expiring their
  105. introduction points every consensus update. This caused
  106. connectivity issues for clients caching the old descriptor and
  107. intro points. Bug reported and fixed by gitlab user
  108. @hyunsoo.kim676. Fixes bug 40858; bugfix on 0.4.7.5-alpha.
  109. o Minor features (debugging, compression):
  110. - Log the input and output buffer sizes when we detect a potential
  111. compression bomb. Diagnostic for ticket 40739.
  112. o Minor features (fallbackdir):
  113. - Regenerate fallback directories generated on September 18, 2023.
  114. o Minor features (geoip data):
  115. - Update the geoip files to match the IPFire Location Database, as
  116. retrieved on 2023/09/18.
  117. o Minor bugfix (defensive programming):
  118. - Disable multiple BUG warnings of a missing relay identity key when
  119. starting an instance of Tor compiled without relay support. Fixes
  120. bug 40848; bugfix on 0.4.3.1-alpha.
  121. o Minor bugfixes (bridge authority):
  122. - When reporting a pseudo-networkstatus as a bridge authority, or
  123. answering "ns/purpose/*" controller requests, include accurate
  124. published-on dates from our list of router descriptors. Fixes bug
  125. 40855; bugfix on 0.4.8.1-alpha.
  126. o Minor bugfixes (compression, zstd):
  127. - Use less frightening language and lower the log-level of our run-
  128. time ABI compatibility check message in our Zstd compression
  129. subsystem. Fixes bug 40815; bugfix on 0.4.3.1-alpha.
  130. Changes in version 0.4.8.5 - 2023-08-30
  131. Quick second release after the first stable few days ago fixing minor
  132. annoying bugfixes creating log BUG stacktrace. We also fix BSD compilation
  133. failures and PoW unit test.
  134. o Minor features (fallbackdir):
  135. - Regenerate fallback directories generated on August 30, 2023.
  136. o Minor features (geoip data):
  137. - Update the geoip files to match the IPFire Location Database, as
  138. retrieved on 2023/08/30.
  139. o Minor bugfix (NetBSD, compilation):
  140. - Fix compilation issue on NetBSD by avoiding an unnecessary
  141. dependency on "huge" page mappings in Equi-X. Fixes bug 40843;
  142. bugfix on 0.4.8.1-alpha.
  143. o Minor bugfix (NetBSD, testing):
  144. - Fix test failures in "crypto/hashx" and "slow/crypto/equix" on
  145. x86_64 and aarch64 NetBSD hosts, by adding support for
  146. PROT_MPROTECT() flags. Fixes bug 40844; bugfix on 0.4.8.1-alpha.
  147. o Minor bugfixes (conflux):
  148. - Demote a relay-side warn about too many legs to ProtocolWarn, as
  149. there are conditions that it can briefly happen during set
  150. construction. Also add additional set logging details for all
  151. error cases. Fixes bug 40841; bugfix on 0.4.8.1-alpha.
  152. - Prevent non-fatal assert stacktrace caused by using conflux sets
  153. during their teardown process. Fixes bug 40842; bugfix
  154. on 0.4.8.1-alpha.
  155. Changes in version 0.4.8.4 - 2023-08-23
  156. Finally, this is the very first stable release of the 0.4.8.x series making,
  157. among other features, Proof-of-Work (prop#327) and Conflux (prop#329)
  158. available to the entire network. Several new features and a lot of bugfixes
  159. detailed below.
  160. o Major feature (denial of service):
  161. - Extend DoS protection to partially opened channels and known relays.
  162. Because re-entry is not allowed anymore, we can apply DoS protections
  163. onto known IP namely relays. Fixes bug 40821; bugfix on 0.3.5.1-alpha.
  164. o Major features (onion service, proof-of-work):
  165. - Implement proposal 327 (Proof-Of-Work). This is aimed at thwarting
  166. introduction flooding DoS attacks by introducing a dynamic Proof-Of-Work
  167. protocol that occurs over introduction circuits. This introduces several
  168. torrc options prefixed with "HiddenServicePoW" in order to control this
  169. feature. By default, this is disabled. Closes ticket 40634.
  170. o Major features (conflux):
  171. - Implement Proposal 329 (conflux traffic splitting). Conflux splits
  172. traffic across two circuits to Exits that support the protocol. These
  173. circuits are pre-built only, which means that if the pre- built conflux
  174. pool runs out, regular circuits will then be used. When using conflux
  175. circuit pairs, clients choose the lower-latency circuit to send data to
  176. the Exit. When the Exit sends data to the client, it maximizes
  177. throughput, by fully utilizing both circuits in a multiplexed fashion.
  178. Alternatively, clients can request that the Exit optimize for latency
  179. when transmitting to them, by setting the torrc option 'ConfluxClientUX
  180. latency'. Onion services are not currently supported, but will be in
  181. arti. Many other future optimizations will also be possible using this
  182. protocol. Closes ticket 40593.
  183. o Major features (dirauth):
  184. - Directory authorities and relays now interact properly with directory
  185. authorities if they change addresses. In the past, they would continue to
  186. upload votes, signatures, descriptors, etc to the hard-coded address in
  187. the configuration. Now, if the directory authority is listed in the
  188. consensus at a different address, they will direct queries to this new
  189. address. Implements ticket 40705.
  190. o Major bugfixes (conflux):
  191. - Fix a relay-side crash caused by side effects of the fix for bug
  192. 40827. Reverts part of that fix that caused the crash and adds additional
  193. log messages to help find the root cause. Fixes bug 40834; bugfix on
  194. 0.4.8.3-rc.
  195. o Major bugfixes (conflux):
  196. - Fix a relay-side assert crash caused by attempts to use a conflux circuit
  197. between circuit close and free, such that no legs were on the conflux
  198. set. Fixed by nulling out the stream's circuit back- pointer when the
  199. last leg is removed. Additional checks and log messages have been added
  200. to detect other cases. Fixes bug 40827; bugfix on 0.4.8.1-alpha.
  201. o Major bugfixes (proof of work, onion service, hashx):
  202. - Fix a very rare buffer overflow in hashx, specific to the dynamic
  203. compiler on aarch64 platforms. Fixes bug 40833; bugfix on 0.4.8.2-alpha.
  204. o Major bugfixes (vanguards):
  205. - Rotate to a new L2 vanguard whenever an existing one loses the Stable or
  206. Fast flag. Previously, we would leave these relays in the L2 vanguard
  207. list but never use them, and if all of our vanguards end up like this we
  208. wouldn't have any middle nodes left to choose from so we would fail to
  209. make onion-related circuits. Fixes bug 40805; bugfix on 0.4.7.1-alpha.
  210. o Minor features (bridge):
  211. - warn when a bridge is also configure to be an exit relay.
  212. Closes ticket 40819.
  213. o Minor features (geoip data):
  214. - Update the geoip files to match the IPFire Location Database, as
  215. retrieved on 2023/08/23.
  216. o Minor features (fallbackdir):
  217. - Regenerate fallback directories generated on August 23, 2023.
  218. o Minor features (testing):
  219. - All Rust code is now linted (cargo clippy) as part of GitLab CI, and
  220. existing warnings have been fixed. - Any unit tests written in Rust now
  221. run as part of GitLab CI.
  222. o Minor feature (CI):
  223. - Update CI to use Debian Bullseye for runners.
  224. o Minor feature (client, IPv6):
  225. - Make client able to pick IPv6 relays by default now meaning
  226. ClientUseIPv6 option now defaults to 1. Closes ticket 40785.
  227. o Minor feature (compilation):
  228. - Fix returning something other than "Unknown N/A" as libc version
  229. if we build tor on an O.S. like DragonFlyBSD, FreeBSD, OpenBSD
  230. or NetBSD.
  231. o Minor feature (cpuworker):
  232. - Always use the number of threads for our CPU worker pool to the
  233. number of core available but cap it to a minimum of 2 in case of a
  234. single core. Fixes bug 40713; bugfix on 0.3.5.1-alpha.
  235. o Minor feature (lzma):
  236. - Fix compiler warnings for liblzma >= 5.3.1. Closes ticket 40741.
  237. o Minor feature (MetricsPort, relay):
  238. - Expose time until online keys expires on the MetricsPort. Closes
  239. ticket 40546.
  240. o Minor feature (MetricsPort, relay, onion service):
  241. - Add metrics for the relay side onion service interactions counting
  242. seen cells. Closes ticket 40797. Patch by "friendly73".
  243. o Minor features (directory authorities):
  244. - Directory authorities now include their AuthDirMaxServersPerAddr
  245. config option in the consensus parameter section of their vote.
  246. Now external tools can better predict how they will behave.
  247. Implements ticket 40753.
  248. o Minor features (directory authority):
  249. - Add a new consensus method in which the "published" times on
  250. router entries in a microdesc consensus are all set to a
  251. meaningless fixed date. Doing this will make the download size for
  252. compressed microdesc consensus diffs much smaller. Part of ticket
  253. 40130; implements proposal 275.
  254. o Minor features (network documents):
  255. - Clients and relays no longer track the "published on" time
  256. declared for relays in any consensus documents. When reporting
  257. this time on the control port, they instead report a fixed date in
  258. the future. Part of ticket 40130.
  259. o Minor features (fallbackdir):
  260. - Regenerate fallback directories generated on June 01, 2023.
  261. o Minor features (geoip data):
  262. - Update the geoip files to match the IPFire Location Database, as
  263. retrieved on 2023/06/01.
  264. o Minor features (hs, metrics):
  265. - Add tor_hs_rend_circ_build_time and tor_hs_intro_circ_build_time
  266. histograms to measure hidden service rend/intro circuit build time
  267. durations. Part of ticket 40757.
  268. o Minor features (metrics):
  269. - Add a `reason` label to the HS error metrics. Closes ticket 40758.
  270. - Add service side metrics for REND and introduction request
  271. failures. Closes ticket 40755.
  272. - Add support for histograms. Part of ticket 40757.
  273. o Minor features (pluggable transports):
  274. - Automatically restart managed Pluggable Transport processes when
  275. their process terminate. Resolves ticket 33669.
  276. o Minor features (portability, compilation):
  277. - Use OpenSSL 1.1 APIs for LibreSSL, fixing LibreSSL 3.5
  278. compatibility. Fixes issue 40630; patch by Alex Xu (Hello71).
  279. o Minor features (relay):
  280. - Do not warn about configuration options that may expose a non-
  281. anonymous onion service. Closes ticket 40691.
  282. o Minor features (relays):
  283. - Trigger OOS when bind fails with EADDRINUSE. This improves
  284. fairness when a large number of exit connections are requested,
  285. and properly signals exhaustion to the network. Fixes issue 40597;
  286. patch by Alex Xu (Hello71).
  287. o Minor features (tests):
  288. - Avoid needless key reinitialization with OpenSSL during unit
  289. tests, saving significant time. Patch from Alex Xu.
  290. o Minor bugfix (hs):
  291. - Fix compiler warnings in equix and hashx when building with clang.
  292. Closes ticket 40800.
  293. o Minor bugfix (FreeBSD, compilation):
  294. - Fix compilation issue on FreeBSD by properly importing
  295. sys/param.h. Fixes bug 40825; bugfix on 0.4.8.1-alpha.
  296. o Minor bugfixes (compression):
  297. - Right after compression/decompression work is done, check for
  298. errors. Before this, we would consider compression bomb before
  299. that and then looking for errors leading to false positive on that
  300. log warning. Fixes bug 40739; bugfix on 0.3.5.1-alpha. Patch
  301. by "cypherpunks".
  302. o Minor bugfixes (compilation):
  303. - Fix all -Werror=enum-int-mismatch warnings. No behavior change.
  304. Fixes bug 40824; bugfix on 0.3.5.1-alpha.
  305. o Minor bugfixes (protocol warn):
  306. - Wrap a handful of cases where ProtocolWarning logs could emit IP
  307. addresses. Fixes bug 40828; bugfix on 0.3.5.1-alpha.
  308. o Minor bugfix (congestion control):
  309. - Reduce the accepted range of a circuit's negotiated 'cc_sendme_inc'
  310. to be +/- 1 from the consensus parameter value. Fixes bug 40569;
  311. bugfix on 0.4.7.4-alpha.
  312. - Remove unused congestion control algorithms and BDP calculation
  313. code, now that we have settled on and fully tuned Vegas. Fixes bug
  314. 40566; bugfix on 0.4.7.4-alpha.
  315. - Update default congestion control parameters to match consensus.
  316. Fixes bug 40709; bugfix on 0.4.7.4-alpha.
  317. o Minor bugfixes (compilation):
  318. - Fix "initializer is not a constant" compilation error that
  319. manifests itself on gcc versions < 8.1 and MSVC. Fixes bug 40773;
  320. bugfix on 0.4.8.1-alpha
  321. o Minor bugfixes (conflux):
  322. - Count leg launch attempts prior to attempting to launch them. This
  323. avoids inifinite launch attempts due to internal circuit building
  324. failures. Additionally, double-check that we have enough exits in
  325. our consensus overall, before attempting to launch conflux sets.
  326. Fixes bug 40811; bugfix on 0.4.8.1-alpha.
  327. - Fix a case where we were resuming reading on edge connections that
  328. were already marked for close. Fixes bug 40801; bugfix
  329. on 0.4.8.1-alpha.
  330. - Fix stream attachment order when creating conflux circuits, so
  331. that stream attachment happens after finishing the full link
  332. handshake, rather than upon set finalization. Fixes bug 40801;
  333. bugfix on 0.4.8.1-alpha.
  334. - Handle legs being closed or destroyed before computing an RTT
  335. (resulting in warns about too many legs). Fixes bug 40810; bugfix
  336. on 0.4.8.1-alpha.
  337. - Remove a "BUG" warning from conflux_pick_first_leg that can be
  338. triggered by broken or malicious clients. Fixes bug 40801; bugfix
  339. on 0.4.8.1-alpha.
  340. o Minor bugfixes (KIST):
  341. - Prevent KISTSchedRunInterval from having values of 0 or 1, neither
  342. of which work properly. Additionally, make a separate
  343. KISTSchedRunIntervalClient parameter, so that the client and relay
  344. KIST values can be set separately. Set the default of both to 2ms.
  345. Fixes bug 40808; bugfix on 0.3.2.1-alpha.
  346. o Minor bugfix (relay, logging):
  347. - The wrong max queue cell size was used in a protocol warning
  348. logging statement. Fixes bug 40745; bugfix on 0.4.7.1-alpha.
  349. o Minor bugfixes (logging):
  350. - Avoid ""double-quoting"" strings in several log messages. Fixes
  351. bug 22723; bugfix on 0.1.2.2-alpha.
  352. - Correct a log message when cleaning microdescriptors. Fixes bug
  353. 40619; bugfix on 0.2.5.4-alpha.
  354. o Minor bugfixes (metrics):
  355. - Decrement hs_intro_established_count on introduction circuit
  356. close. Fixes bug 40751; bugfix on 0.4.7.12.
  357. o Minor bugfixes (pluggable transports, windows):
  358. - Remove a warning `BUG()` that could occur when attempting to
  359. execute a non-existing pluggable transport on Windows. Fixes bug
  360. 40596; bugfix on 0.4.0.1-alpha.
  361. o Minor bugfixes (relay):
  362. - Remove a "BUG" warning for an acceptable race between a circuit
  363. close and considering that circuit active. Fixes bug 40647; bugfix
  364. on 0.3.5.1-alpha.
  365. - Remove a harmless "Bug" log message that can happen in
  366. relay_addr_learn_from_dirauth() on relays during startup. Finishes
  367. fixing bug 40231. Fixes bug 40523; bugfix on 0.4.5.4-rc.
  368. o Minor bugfixes (sandbox):
  369. - Allow membarrier for the sandbox. And allow rt_sigprocmask when
  370. compiled with LTTng. Fixes bug 40799; bugfix on 0.3.5.1-alpha.
  371. - Fix sandbox support on AArch64 systems. More "*at" variants of
  372. syscalls are now supported. Signed 32 bit syscall parameters are
  373. checked more precisely, which should lead to lower likelihood of
  374. breakages with future compiler and libc releases. Fixes bug 40599;
  375. bugfix on 0.4.4.3-alpha.
  376. o Minor bugfixes (state file):
  377. - Avoid a segfault if the state file doesn't contains TotalBuildTimes
  378. along CircuitBuildAbandonedCount being above 0. Fixes bug 40437;
  379. bugfix on 0.3.5.1-alpha.
  380. o Removed features:
  381. - Remove the RendPostPeriod option. This was primarily used in
  382. Version 2 Onion Services and after its deprecation isn't needed
  383. anymore. Closes ticket 40431. Patch by Neel Chauhan.
  384. Changes in version 0.4.7.13 - 2023-01-12
  385. This version contains three major bugfixes, two for relays and one for
  386. client being a security fix, TROVE-2022-002. We have added, for Linux, the
  387. support for IP_BIND_ADDRESS_NO_PORT for relays using OutboundBindAddress.
  388. We strongly recommend to upgrade to this version considering the important
  389. congestion control fix detailed below.
  390. o Major bugfixes (congestion control):
  391. - Avoid incrementing the congestion window when the window is not
  392. fully in use. Thia prevents overshoot in cases where long periods
  393. of low activity would allow our congestion window to grow, and
  394. then get followed by a burst, which would cause queue overload.
  395. Also improve the increment checks for RFC3742. Fixes bug 40732;
  396. bugfix on 0.4.7.5-alpha.
  397. o Major bugfixes (relay):
  398. - When opening a channel because of a circuit request that did not
  399. include an Ed25519 identity, record the Ed25519 identity that we
  400. actually received, so that we can use the channel for other
  401. circuit requests that _do_ list an Ed25519 identity. (Previously
  402. we had code to record this identity, but a logic bug caused it to
  403. be disabled.) Fixes bug 40563; bugfix on 0.3.0.1-alpha. Patch
  404. from "cypherpunks".
  405. o Major bugfixes (TROVE-2022-002, client):
  406. - The SafeSocks option had its logic inverted for SOCKS4 and
  407. SOCKS4a. It would let the unsafe SOCKS4 pass but not the safe
  408. SOCKS4a one. This is TROVE-2022-002 which was reported on
  409. Hackerone by "cojabo". Fixes bug 40730; bugfix on 0.3.5.1-alpha.
  410. o Minor feature (authority):
  411. - Reject 0.4.6.x series at the authority level. Closes ticket 40664.
  412. o Minor features (fallbackdir):
  413. - Regenerate fallback directories generated on January 12, 2023.
  414. o Minor features (geoip data):
  415. - Update the geoip files to match the IPFire Location Database, as
  416. retrieved on 2023/01/12.
  417. o Minor features (relays):
  418. - Set the Linux-specific IP_BIND_ADDRESS_NO_PORT option on outgoing
  419. sockets, allowing relays using OutboundBindAddress to make more
  420. outgoing connections than ephemeral ports, as long as they are to
  421. separate destinations. Related to issue 40597; patch by Alex
  422. Xu (Hello71).
  423. o Minor bugfixes (relay, metrics):
  424. - Fix typo in a congestion control label on the MetricsPort. Fixes
  425. bug 40727; bugfix on 0.4.7.12.
  426. o Minor bugfixes (sandbox, authority):
  427. - With the sandbox enabled, allow to write "my-consensus-
  428. {ns|microdesc}" and to rename them as well. Fixes bug 40729;
  429. bugfix on 0.3.5.1-alpha.
  430. o Code simplifications and refactoring:
  431. - Rely on actual error returned by the kernel when choosing what
  432. resource exhaustion to log. Fixes issue 40613; Fix
  433. on tor-0.4.6.1-alpha.
  434. Changes in version 0.4.5.16 - 2023-01-12
  435. This version has one major bugfix for relay and a security fix,
  436. TROVE-2022-002, affecting clients. We strongly recommend to upgrade to our
  437. 0.4.7.x stable series. As a reminder, this series is EOL on February 15th,
  438. 2023.
  439. o Major bugfixes (relay):
  440. - When opening a channel because of a circuit request that did not
  441. include an Ed25519 identity, record the Ed25519 identity that we
  442. actually received, so that we can use the channel for other
  443. circuit requests that _do_ list an Ed25519 identity. (Previously
  444. we had code to record this identity, but a logic bug caused it to
  445. be disabled.) Fixes bug 40563; bugfix on 0.3.0.1-alpha. Patch
  446. from "cypherpunks".
  447. o Major bugfixes (TROVE-2022-002, client):
  448. - The SafeSocks option had its logic inverted for SOCKS4 and
  449. SOCKS4a. It would let the unsafe SOCKS4 pass but not the safe
  450. SOCKS4a one. This is TROVE-2022-002 which was reported on
  451. Hackerone by "cojabo". Fixes bug 40730; bugfix on 0.3.5.1-alpha.
  452. o Minor features (fallbackdir):
  453. - Regenerate fallback directories generated on January 12, 2023.
  454. o Minor features (geoip data):
  455. - Update the geoip files to match the IPFire Location Database, as
  456. retrieved on 2023/01/12.
  457. Changes in version 0.4.7.12 - 2022-12-06
  458. This version contains a major change that is a new key for moria1. Also, new
  459. metrics are exported on the MetricsPort for the congestion control
  460. subsystem.
  461. o Directory authority changes (moria1):
  462. - Rotate the relay identity key and v3 identity key for moria1. They
  463. have been online for more than a decade and refreshing keys
  464. periodically is good practice. Advertise new ports too, to avoid
  465. confusion. Closes ticket 40722.
  466. o Minor feature (Congestion control metrics):
  467. - Add additional metricsport relay metrics for congestion control.
  468. Closes ticket 40724.
  469. o Minor features (fallbackdir):
  470. - Regenerate fallback directories generated on December 06, 2022.
  471. o Minor features (geoip data):
  472. - Update the geoip files to match the IPFire Location Database, as
  473. retrieved on 2022/12/06.
  474. o Minor bugfixes (cpuworker, relay):
  475. - Fix an off by one overload calculation on the number of CPUs being
  476. used by our thread pool. Fixes bug 40719; bugfix on 0.3.5.1-alpha.
  477. Changes in version 0.4.5.15 - 2022-12-06
  478. This version has several major changes for directory authorities. And a
  479. major bugfix on OSX. Again, we strongly recommend to upgrade to our 0.4.7.x
  480. series latest stable. This series is EOL on February 15th, 2023.
  481. o Directory authority changes (dizum):
  482. - Change dizum IP address. Closes ticket 40687.
  483. o Directory authority changes (Faravahar):
  484. - Remove Faravahar until its operator, Sina, set it back up online
  485. outside of Team Cymru network. Closes ticket 40688.
  486. o Directory authority changes (moria1):
  487. - Rotate the relay identity key and v3 identity key for moria1. They
  488. have been online for more than a decade and refreshing keys
  489. periodically is good practice. Advertise new ports too, to avoid
  490. confusion. Closes ticket 40722.
  491. o Major bugfixes (OSX):
  492. - Fix coarse-time computation on Apple platforms (like Mac M1) where
  493. the Mach absolute time ticks do not correspond directly to
  494. nanoseconds. Previously, we computed our shift value wrong, which
  495. led us to give incorrect timing results. Fixes bug 40684; bugfix
  496. on 0.3.3.1-alpha.
  497. o Major bugfixes (relay):
  498. - Improve security of our DNS cache by randomly clipping the TTL
  499. value. TROVE-2021-009. Fixes bug 40674; bugfix on 0.3.5.1-alpha.
  500. o Minor features (fallbackdir):
  501. - Regenerate fallback directories generated on December 06, 2022.
  502. o Minor features (geoip data):
  503. - Update the geoip files to match the IPFire Location Database, as
  504. retrieved on 2022/12/06.
  505. Changes in version 0.4.7.11 - 2022-11-10
  506. This version contains several major fixes aimed at helping defend against
  507. network denial of service. It is also extending drastically the MetricsPort
  508. for relays to help us gather more internal data to investigate performance
  509. and attacks.
  510. We strongly recommend to upgrade to this version especially for Exit relays
  511. in order to help the network defend against this ongoing DDoS.
  512. o Directory authority changes (dizum, Faravahar):
  513. - Change dizum IP address. Closes ticket 40687.
  514. - Remove Faravahar until its operator, Sina, set it back up online
  515. outside of Team Cymru network. Closes ticket 40688.
  516. o Major bugfixes (geoip data):
  517. - IPFire informed us on August 12th that databases generated after
  518. (including) August 10th did not have proper ARIN network
  519. allocations. We are updating the database to use the one generated
  520. on August 9th, 2022. Fixes bug 40658; bugfix on 0.4.5.13.
  521. o Major bugfixes (onion service):
  522. - Set a much higher circuit build timeout for opened client rendezvous
  523. circuit. Before this, tor would time them out very quickly leading to
  524. unnecessary retries meaning more load on the network. Fixes bug 40694;
  525. bugfix on 0.3.5.1-alpha.
  526. o Major bugfixes (OSX):
  527. - Fix coarse-time computation on Apple platforms (like Mac M1) where
  528. the Mach absolute time ticks do not correspond directly to
  529. nanoseconds. Previously, we computed our shift value wrong, which
  530. led us to give incorrect timing results. Fixes bug 40684; bugfix
  531. on 0.3.3.1-alpha.
  532. o Major bugfixes (relay):
  533. - Improve security of our DNS cache by randomly clipping the TTL
  534. value. TROVE-2021-009. Fixes bug 40674; bugfix on 0.3.5.1-alpha.
  535. o Minor feature (Mac and iOS build):
  536. - Change how combine_libs works on Darwin like platforms to make
  537. sure we don't include any `__.SYMDEF` and `__.SYMDEF SORTED`
  538. symbols on the archive before we repack and run ${RANLIB} on the
  539. archive. This fixes a build issue with recent Xcode versions on
  540. Mac Silicon and iOS. Closes ticket 40683.
  541. o Minor feature (metrics):
  542. - Add various congestion control counters to the MetricsPort. Closes
  543. ticket 40708.
  544. o Minor feature (performance):
  545. - Bump the maximum amount of CPU that can be used from 16 to 128. Note
  546. that NumCPUs torrc option overrides this hardcoded maximum. Fixes bug
  547. 40703; bugfix on 0.3.5.1-alpha.
  548. o Minor feature (relay):
  549. - Make an hardcoded value for the maximum of per CPU tasks into a
  550. consensus parameter.
  551. - Two new consensus parameters are added to control the wait time in
  552. queue of the onionskins. One of them is the torrc
  553. MaxOnionQueueDelay options which supersedes the consensus
  554. parameter. Closes ticket 40704.
  555. o Minor feature (relay, DoS):
  556. - Apply circuit creation anti-DoS defenses if the outbound circuit
  557. max cell queue size is reached too many times. This introduces two
  558. new consensus parameters to control the queue size limit and
  559. number of times allowed to go over that limit. Closes ticket 40680.
  560. o Minor feature (relay, metrics):
  561. - Add DoS defenses counter to MetricsPort.
  562. - Add congestion control RTT reset counter to MetricsPort.
  563. - Add counters to the MetricsPort how many connections, per type,
  564. are currently opened and how many were created.
  565. - Add relay flags from the consensus to the MetricsPort.
  566. - Add total number of opened circuits to MetricsPort.
  567. - Add total number of streams seen by an Exit to the MetricsPort.
  568. - Add traffic stats as in number of read/written bytes in total.
  569. - Related to ticket 40194.
  570. o Minor features (fallbackdir):
  571. - Regenerate fallback directories generated on November 10, 2022.
  572. o Minor features (geoip data):
  573. - Update the geoip files to match the IPFire Location Database, as
  574. retrieved on 2022/11/10.
  575. o Minor bugfixes (authorities, sandbox):
  576. - Allow to write file my-consensus-<flavor-name> to disk when
  577. sandbox is activated. Fixes bug 40663; bugfix on 0.3.5.1-alpha.
  578. o Minor bugfixes (dirauth):
  579. - Directory authorities stop voting a consensus "Measured" weight
  580. for relays with the Authority flag. Now these relays will be
  581. considered unmeasured, which should reserve their bandwidth for
  582. their dir auth role and minimize distractions from other roles. In
  583. place of the "Measured" weight, they now include a
  584. "MeasuredButAuthority" weight (not used by anything) so the
  585. bandwidth authority's opinion on this relay can be recorded for
  586. posterity. Lastly, remove the AuthDirDontVoteOnDirAuthBandwidth
  587. torrc option which never worked right. Fixes bugs 40698 and 40700;
  588. bugfix on 0.4.7.2-alpha.
  589. o Minor bugfixes (onion service client):
  590. - A collapsing onion service circuit should be seen as an
  591. "unreachable" error so it can be retried. Fixes bug 40692; bugfix
  592. on 0.3.5.1-alpha.
  593. o Minor bugfixes (onion service):
  594. - Make the service retry a rendezvous if the circuit is being
  595. repurposed for measurements. Fixes bug 40696; bugfix
  596. on 0.3.5.1-alpha.
  597. o Minor bugfixes (relay overload statistics):
  598. - Count total create cells vs dropped create cells properly, when
  599. assessing if our fraction of dropped cells is too high. We only
  600. count non-client circuits in the denominator, but we would include
  601. client circuits in the numerator, leading to surprising log lines
  602. claiming that we had dropped more than 100% of incoming create
  603. cells. Fixes bug 40673; bugfix on 0.4.7.1-alpha.
  604. o Code simplification and refactoring (bridges):
  605. - Remove unused code related to ExtPort connection ID. Fixes bug
  606. 40648; bugfix on 0.3.5.1-alpha.
  607. Changes in version 0.4.7.10 - 2022-08-12
  608. This version updates the geoip cache that we generate from IPFire location
  609. database to use the August 9th, 2022 one. Everyone MUST update to this
  610. latest release else circuit path selection and relay metrics are badly
  611. affected.
  612. o Major bugfixes (geoip data):
  613. - IPFire informed us on August 12th that databases generated after
  614. (including) August 10th did not have proper ARIN network allocations. We
  615. are updating the database to use the one generated on August 9th, 2022.
  616. Fixes bug 40658; bugfix on 0.4.7.9.
  617. Changes in version 0.4.6.12 - 2022-08-12
  618. This version updates the geoip cache that we generate from IPFire location
  619. database to use the August 9th, 2022 one. Everyone MUST update to this
  620. latest release else circuit path selection and relay metrics are badly
  621. affected.
  622. o Major bugfixes (geoip data):
  623. - IPFire informed us on August 12th that databases generated after
  624. (including) August 10th did not have proper ARIN network allocations. We
  625. are updating the database to use the one generated on August 9th, 2022.
  626. Fixes bug 40658; bugfix on 0.4.6.11.
  627. Changes in version 0.4.5.14 - 2022-08-12
  628. This version updates the geoip cache that we generate from IPFire location
  629. database to use the August 9th, 2022 one. Everyone MUST update to this
  630. latest release else circuit path selection and relay metrics are badly
  631. affected.
  632. o Major bugfixes (geoip data):
  633. - IPFire informed us on August 12th that databases generated after
  634. (including) August 10th did not have proper ARIN network allocations. We
  635. are updating the database to use the one generated on August 9th, 2022.
  636. Fixes bug 40658; bugfix on 0.4.5.13.
  637. Changes in version 0.4.7.9 - 2022-08-11
  638. This version contains several major fixes aimed at reducing memory pressure on
  639. relays and possible side-channel. It also contains a major bugfix related to
  640. congestion control also aimed at reducing memory pressure on relays.
  641. Finally, there is last one major bugfix related to Vanguard L2 layer node
  642. selection.
  643. We strongly recommend to upgrade to this version especially for Exit relays
  644. in order to help the network defend against this ongoing DDoS.
  645. o Major bugfixes (congestion control):
  646. - Implement RFC3742 Limited Slow Start. Congestion control was
  647. overshooting the congestion window during slow start, particularly
  648. for onion service activity. With this fix, we now update the
  649. congestion window more often during slow start, as well as dampen
  650. the exponential growth when the congestion window grows above a
  651. capping parameter. This should reduce the memory increases guard
  652. relays were seeing, as well as allow us to set lower queue limits
  653. to defend against ongoing DoS attacks. Fixes bug 40642; bugfix
  654. on 0.4.7.5-alpha.
  655. o Major bugfixes (relay):
  656. - Remove OR connections btrack subsystem entries when the connections
  657. close normally. Before this, we would only remove the entry on error and
  658. thus leaking memory for each normal OR connections. Fixes bug 40604;
  659. bugfix on 0.4.0.1-alpha.
  660. - Stop sending TRUNCATED cell and instead close the circuit from which we
  661. received a DESTROY cell. This makes every relay in the circuit path to
  662. stop queuing cells. Fixes bug 40623; bugfix on 0.1.0.2-rc.
  663. o Major bugfixes (vanguards):
  664. - We had omitted some checks for whether our vanguards (second layer
  665. guards from proposal 333) overlapped. Now make sure to pick each
  666. of them to be independent. Also, change the design to allow them
  667. to come from the same family. Fixes bug 40639; bugfix
  668. on 0.4.7.1-alpha.
  669. o Minor features (dirauth):
  670. - Add a torrc option to control the Guard flag bandwidth threshold
  671. percentile. Closes ticket 40652.
  672. - Add an AuthDirVoteGuard torrc option that can allow authorities to
  673. assign the Guard flag to the given fingerprints/country code/IPs.
  674. This is a needed feature mostly for defense purposes in case a DoS
  675. hits the network and relay start losing the Guard flags too fast.
  676. - Make UPTIME_TO_GUARANTEE_STABLE, MTBF_TO_GUARANTEE_STABLE,
  677. TIME_KNOWN_TO_GUARANTEE_FAMILIAR WFU_TO_GUARANTEE_GUARD tunable
  678. from torrc.
  679. o Minor features (fallbackdir):
  680. - Regenerate fallback directories generated on August 11, 2022.
  681. o Minor features (geoip data):
  682. - Update the geoip files to match the IPFire Location Database, as
  683. retrieved on 2022/08/11.
  684. o Minor bugfixes (congestion control):
  685. - Add a check for an integer underflow condition that might happen
  686. in cases where the system clock is stopped, the ORconn is blocked,
  687. and the endpoint sends more than a congestion window worth of non-
  688. data control cells at once. This would cause a large congestion
  689. window to be calculated instead of a small one. No security
  690. impact. Fixes bug 40644; bugfix on 0.4.7.5-alpha.
  691. o Minor bugfixes (defense in depth):
  692. - Change a test in the netflow padding code to make it more
  693. _obviously_ safe against remotely triggered crashes. (It was safe
  694. against these before, but not obviously so.) Fixes bug 40645;
  695. bugfix on 0.3.1.1-alpha.
  696. o Minor bugfixes (relay):
  697. - Do not propagate either forward or backward a DESTROY remote reason when
  698. closing a circuit in order to avoid a possible side channel. Fixes bug
  699. 40649; bugfix on 0.1.2.4-alpha.
  700. Changes in version 0.4.6.11 - 2022-08-11
  701. This version contains two major fixes aimed at reducing memory pressure on
  702. relays and possible side-channel. The rest of the fixes were backported for
  703. stability or safety purposes.
  704. This is the very LAST version of this series. As of August 1st 2022, it is
  705. end-of-life (EOL). We thus strongly recommend to upgrade to the latest
  706. stable of the 0.4.7.x series.
  707. o Major bugfixes (relay):
  708. - Remove OR connections btrack subsystem entries when the connections
  709. close normally. Before this, we would only remove the entry on error and
  710. thus leaking memory for each normal OR connections. Fixes bug 40604;
  711. bugfix on 0.4.0.1-alpha.
  712. - Stop sending TRUNCATED cell and instead close the circuit from which we
  713. received a DESTROY cell. This makes every relay in the circuit path to
  714. stop queuing cells. Fixes bug 40623; bugfix on 0.1.0.2-rc.
  715. o Minor features (fallbackdir):
  716. - Regenerate fallback directories generated on August 11, 2022.
  717. o Minor features (geoip data):
  718. - Update the geoip files to match the IPFire Location Database, as
  719. retrieved on 2022/08/11.
  720. o Minor features (linux seccomp2 sandbox):
  721. - Permit the clone3 syscall, which is apparently used in glibc-2.34
  722. and later. Closes ticket 40590.
  723. o Minor bugfixes (controller, path bias):
  724. - When a circuit's path is specified, in full or in part, from the
  725. controller API, do not count that circuit towards our path-bias
  726. calculations. (Doing so was incorrect, since we cannot tell
  727. whether the controller is selecting relays randomly.) Resolves a
  728. "Bug" warning. Fixes bug 40515; bugfix on 0.2.4.10-alpha.
  729. o Minor bugfixes (defense in depth):
  730. - Change a test in the netflow padding code to make it more
  731. _obviously_ safe against remotely triggered crashes. (It was safe
  732. against these before, but not obviously so.) Fixes bug 40645;
  733. bugfix on 0.3.1.1-alpha.
  734. o Minor bugfixes (linux seccomp2 sandbox):
  735. - Allow the rseq system call in the sandbox. This solves a crash
  736. issue with glibc 2.35 on Linux. Patch from pmu-ipf. Fixes bug
  737. 40601; bugfix on 0.3.5.11.
  738. o Minor bugfixes (metrics port, onion service):
  739. - The MetricsPort line for an onion service with multiple ports are now
  740. unique that is one line per port. Before this, all ports of an onion
  741. service would be on the same line which violates the Prometheus rules of
  742. unique labels. Fixes bug 40581; bugfix on 0.4.5.1-alpha.
  743. o Minor bugfixes (onion service, client):
  744. - Fix a fatal assert due to a guard subsystem recursion triggered by
  745. the onion service client. Fixes bug 40579; bugfix on 0.3.5.1-alpha.
  746. o Minor bugfixes (performance, DoS):
  747. - Fix one case of a not-especially viable denial-of-service attack
  748. found by OSS-Fuzz in our consensus-diff parsing code. This attack
  749. causes a lot small of memory allocations and then immediately
  750. frees them: this is only slow when running with all the sanitizers
  751. enabled. Fixes one case of bug 40472; bugfix on 0.3.1.1-alpha.
  752. o Minor bugfixes (relay):
  753. - Do not propagate either forward or backward a DESTROY remote reason when
  754. closing a circuit in order to avoid a possible side channel. Fixes bug
  755. 40649; bugfix on 0.1.2.4-alpha.
  756. Changes in version 0.4.5.13 - 2022-08-11
  757. This version contains two major fixes aimed at reducing memory pressure on
  758. relays and possible side-channel. The rest of the fixes were backported for
  759. stability or safety purposes. We strongly recommend to upgrade your relay to
  760. this version or, ideally, to the latest stable of the 0.4.7.x series.
  761. o Major bugfixes (relay):
  762. - Remove OR connections btrack subsystem entries when the connections
  763. close normally. Before this, we would only remove the entry on error and
  764. thus leaking memory for each normal OR connections. Fixes bug 40604;
  765. bugfix on 0.4.0.1-alpha.
  766. - Stop sending TRUNCATED cell and instead close the circuit from which we
  767. received a DESTROY cell. This makes every relay in the circuit path to
  768. stop queuing cells. Fixes bug 40623; bugfix on 0.1.0.2-rc.
  769. o Minor features (fallbackdir):
  770. - Regenerate fallback directories generated on August 11, 2022.
  771. o Minor features (geoip data):
  772. - Update the geoip files to match the IPFire Location Database, as
  773. retrieved on 2022/08/11.
  774. o Minor features (linux seccomp2 sandbox):
  775. - Permit the clone3 syscall, which is apparently used in glibc-2.34
  776. and later. Closes ticket 40590.
  777. o Minor bugfixes (controller, path bias):
  778. - When a circuit's path is specified, in full or in part, from the
  779. controller API, do not count that circuit towards our path-bias
  780. calculations. (Doing so was incorrect, since we cannot tell
  781. whether the controller is selecting relays randomly.) Resolves a
  782. "Bug" warning. Fixes bug 40515; bugfix on 0.2.4.10-alpha.
  783. o Minor bugfixes (defense in depth):
  784. - Change a test in the netflow padding code to make it more
  785. _obviously_ safe against remotely triggered crashes. (It was safe
  786. against these before, but not obviously so.) Fixes bug 40645;
  787. bugfix on 0.3.1.1-alpha.
  788. o Minor bugfixes (linux seccomp2 sandbox):
  789. - Allow the rseq system call in the sandbox. This solves a crash
  790. issue with glibc 2.35 on Linux. Patch from pmu-ipf. Fixes bug
  791. 40601; bugfix on 0.3.5.11.
  792. o Minor bugfixes (metrics port, onion service):
  793. - The MetricsPort line for an onion service with multiple ports are now
  794. unique that is one line per port. Before this, all ports of an onion
  795. service would be on the same line which violates the Prometheus rules of
  796. unique labels. Fixes bug 40581; bugfix on 0.4.5.1-alpha.
  797. o Minor bugfixes (onion service, client):
  798. - Fix a fatal assert due to a guard subsystem recursion triggered by
  799. the onion service client. Fixes bug 40579; bugfix on 0.3.5.1-alpha.
  800. o Minor bugfixes (performance, DoS):
  801. - Fix one case of a not-especially viable denial-of-service attack
  802. found by OSS-Fuzz in our consensus-diff parsing code. This attack
  803. causes a lot small of memory allocations and then immediately
  804. frees them: this is only slow when running with all the sanitizers
  805. enabled. Fixes one case of bug 40472; bugfix on 0.3.1.1-alpha.
  806. o Minor bugfixes (relay):
  807. - Do not propagate either forward or backward a DESTROY remote reason when
  808. closing a circuit in order to avoid a possible side channel. Fixes bug
  809. 40649; bugfix on 0.1.2.4-alpha.
  810. Changes in version 0.4.7.8 - 2022-06-17
  811. This version fixes several bugfixes including a High severity security issue
  812. categorized as a Denial of Service. Everyone running an earlier version
  813. should upgrade to this version.
  814. o Major bugfixes (congestion control, TROVE-2022-001):
  815. - Fix a scenario where RTT estimation can become wedged, seriously
  816. degrading congestion control performance on all circuits. This
  817. impacts clients, onion services, and relays, and can be triggered
  818. remotely by a malicious endpoint. Tracked as CVE-2022-33903. Fixes
  819. bug 40626; bugfix on 0.4.7.5-alpha.
  820. o Minor features (fallbackdir):
  821. - Regenerate fallback directories generated on June 17, 2022.
  822. o Minor features (geoip data):
  823. - Update the geoip files to match the IPFire Location Database, as
  824. retrieved on 2022/06/17.
  825. o Minor bugfixes (linux seccomp2 sandbox):
  826. - Allow the rseq system call in the sandbox. This solves a crash
  827. issue with glibc 2.35 on Linux. Patch from pmu-ipf. Fixes bug
  828. 40601; bugfix on 0.3.5.11.
  829. o Minor bugfixes (logging):
  830. - Demote a harmless warn log message about finding a second hop to
  831. from warn level to info level, if we do not have enough
  832. descriptors yet. Leave it at notice level for other cases. Fixes
  833. bug 40603; bugfix on 0.4.7.1-alpha.
  834. - Demote a notice log message about "Unexpected path length" to info
  835. level. These cases seem to happen arbitrarily, and we likely will
  836. never find all of them before the switch to arti. Fixes bug 40612;
  837. bugfix on 0.4.7.5-alpha.
  838. o Minor bugfixes (relay, logging):
  839. - Demote a harmless XOFF log message to from notice level to info
  840. level. Fixes bug 40620; bugfix on 0.4.7.5-alpha.
  841. Changes in version 0.4.7.7 - 2022-04-27
  842. This is the first stable version of the 0.4.7.x series. This series
  843. includes several major bugfixes from previous series and several features
  844. including one massive new one: congestion control.
  845. Congestion control, among other things, should improve traffic speed and
  846. stability on the network once a majority of Exit upgrade. You can find more
  847. details about it in proposal 324 in the torspec.git repository.
  848. Below are all the changes of the 0.4.7.x series:
  849. o Major features (congestion control):
  850. - Implement support for flow control over congestion controlled
  851. circuits. This work comes from proposal 324. Closes ticket 40450.
  852. o Major features (relay, client, onion services):
  853. - Implement RTT-based congestion control for exits and onion
  854. services, from Proposal 324. Disabled by default. Enabled by the
  855. 'cc_alg' consensus parameter. Closes ticket 40444.
  856. o Major features (directory authority):
  857. - Add a new consensus method to handle MiddleOnly specially. When
  858. enough authorities are using this method, then any relay tagged
  859. with the MiddleOnly flag will have its Exit, Guard, HSDir, and
  860. V2Dir flags automatically cleared, and will have its BadExit flag
  861. automatically set. Implements part of proposal 335.
  862. - Authorities can now be configured to label relays as "MiddleOnly".
  863. When voting for this flag, authorities automatically vote against
  864. Exit, Guard, HSDir, and V2Dir; and in favor of BadExit. Implements
  865. part of proposal 335. Based on a patch from Neel Chauhan.
  866. o Major features (Proposal 332, onion services, guard selection algorithm):
  867. - Clients and onion services now choose four long-lived "layer 2"
  868. guard relays for use as the middle hop in all onion circuits.
  869. These relays are kept in place for a randomized duration averaging
  870. 1 week. This mitigates guard discovery attacks against clients and
  871. short-lived onion services such as OnionShare. Long-lived onion
  872. services that need high security should still use the Vanguards
  873. addon (https://github.com/mikeperry-tor/vanguards). Closes ticket
  874. 40363; implements proposal 333.
  875. o Major bugfix (relay, metrics):
  876. - On the MetricsPort, the DNS error statistics are not reported by
  877. record type ("record=...") anymore due to a libevent bug
  878. (https://github.com/libevent/libevent/issues/1219). Fixes bug
  879. 40490; bugfix on 0.4.7.1-alpha.
  880. o Major bugfixes (bridges):
  881. - Make Tor work reliably again when you have multiple bridges
  882. configured and one or more of them are unreachable. The problem
  883. came because we require that we have bridge descriptors for both
  884. of our first two bridges (else we refuse to try to connect), but
  885. in some cases we would wait three hours before trying to fetch
  886. these missing descriptors, and/or never recover when we do try to
  887. fetch them. Fixes bugs 40396 and 40495; bugfix on 0.3.0.5-rc
  888. and 0.3.2.1-alpha.
  889. o Major bugfixes (client):
  890. - Stop caching TCP connect failures to relays/bridges when we
  891. initiated the connection as a client. Now we only cache connect
  892. failures as a relay or bridge when we initiated them because of an
  893. EXTEND request. Declining to re-attempt the client-based
  894. connections could cause problems when we lose connectivity and try
  895. to reconnect. Fixes bug 40499; bugfix on 0.3.3.4-alpha.
  896. o Major bugfixes (onion service, congestion control):
  897. - Fix the onion service upload case where the congestion control
  898. parameters were not added to the right object. Fixes bug 40586;
  899. bugfix on 0.4.7.4-alpha.
  900. o Major bugfixes (relay, DNS):
  901. - Lower the DNS timeout from 3 attempts at 5 seconds each to 2
  902. attempts at 1 seconds each. Two new consensus parameters were
  903. added to control these values. This change should improve observed
  904. performance under DNS load; see ticket for more details. Fixes bug
  905. 40312; bugfix on 0.3.5.1-alpha.
  906. o Major bugfixes (relay, overload state):
  907. - Relays report the general overload state for DNS timeout errors
  908. only if X% of all DNS queries over Y seconds are errors. Before
  909. that, it only took 1 timeout to report the overload state which
  910. was just too low of a threshold. The X and Y values are 1% and 10
  911. minutes respectively but they are also controlled by consensus
  912. parameters. Fixes bug 40491; bugfix on 0.4.6.1-alpha.
  913. o Major bugfixes (relay, overload):
  914. - Do not trigger a general overload on DNS timeout. Even after
  915. fixing 40527, some code remained that triggered the overload.
  916. Fixes bug 40564; bugfix on 0.4.7.1-alpha.
  917. - Change the MetricsPort DNS "timeout" label to be "tor_timeout" in
  918. order to indicate that this was a DNS timeout from tor perspective
  919. and not the DNS server itself.
  920. - Deprecate overload_dns_timeout_period_secs and
  921. overload_dns_timeout_scale_percent consensus parameters as well.
  922. They were used to assess the overload state which is no more now.
  923. - Don't make Tor DNS timeout trigger an overload general state.
  924. These timeouts are different from DNS server timeout. They have to
  925. be seen as timeout related to UX and not because of a network
  926. problem. Fixes bug 40527; bugfix on 0.4.6.1-alpha.
  927. o Minor feature (authority, relay):
  928. - Reject End-Of-Life relays running version 0.4.2.x, 0.4.3.x,
  929. 0.4.4.x and 0.4.5 alphas/rc. Closes ticket 40480.
  930. - Reject End-Of-Life relays running version 0.3.5.x. Closes
  931. ticket 40559.
  932. o Minor feature (onion service v2):
  933. - Onion service v2 addresses are now not recognized anymore by tor
  934. meaning a bad hostname is returned when attempting to pass it on a
  935. SOCKS connection. No more deprecation log is emitted client side.
  936. Closes ticket 40476.
  937. - See https://blog.torproject.org/v2-deprecation-timeline for
  938. details on how to transition from v2 to v3.
  939. o Minor feature (reproducible build):
  940. - The repository can now build reproducible tarballs which adds the
  941. build command "make dist-reprod" for that purpose. Closes
  942. ticket 26299.
  943. o Minor features (bridge testing support):
  944. - Let external bridge reachability testing tools discard cached
  945. bridge descriptors when setting new bridges, so they can be sure
  946. to get a clean reachability test. Implements ticket 40209.
  947. o Minor features (compilation):
  948. - Give an error message if trying to build with a version of
  949. LibreSSL known not to work with Tor. (There's an incompatibility
  950. with LibreSSL versions 3.2.1 through 3.4.0 inclusive because of
  951. their incompatibility with OpenSSL 1.1.1's TLSv1.3 APIs.) Closes
  952. ticket 40511.
  953. o Minor features (control port):
  954. - Provide congestion control fields on CIRC_BW and STREAM control
  955. port events, for use by sbws. Closes ticket 40568.
  956. o Minor features (fallbackdir):
  957. - Regenerate fallback directories generated on April 27, 2022.
  958. o Minor features (fuzzing):
  959. - When building with --enable-libfuzzer, use a set of compiler flags
  960. that works with more recent versions of the library. Previously we
  961. were using a set of flags from 2017. Closes ticket 40407.
  962. o Minor features (geoip data):
  963. - Update the geoip files to match the IPFire Location Database, as
  964. retrieved on 2022/04/27.
  965. o Minor features (logging, heartbeat):
  966. - When a relay receives a cell that isn't encrypted properly for it,
  967. but the relay is the last hop on the circuit, the relay now counts
  968. how many cells of this kind it receives, on how many circuits, and
  969. reports this information in the log. Previously, we'd log each
  970. cell at PROTOCOL_WARN level, which is far too verbose to be
  971. useful. Fixes part of ticket 40400.
  972. o Minor features (portability):
  973. - Try to prevent a compiler warning about printf arguments that
  974. could sometimes occur on MSYS2 depending on the configuration.
  975. Closes ticket 40355.
  976. o Minor features (testing configuration):
  977. - When TestingTorNetwork is enabled, skip the permissions check on
  978. hidden service directories. Closes ticket 40338.
  979. - On a testing network, relays can now use the
  980. TestingMinTimeToReportBandwidth option to change the smallest
  981. amount of time over which they're willing to report their observed
  982. maximum bandwidth. Previously, this was fixed at 1 day. For
  983. safety, values under 2 hours are only supported on testing
  984. networks. Part of a fix for ticket 40337.
  985. - Relays on testing networks no longer rate-limit how frequently
  986. they are willing to report new bandwidth measurements. Part of a
  987. fix for ticket 40337.
  988. - Relays on testing networks now report their observed bandwidths
  989. immediately from startup. Previously, they waited until they had
  990. been running for a full day. Closes ticket 40337.
  991. o Minor features (testing):
  992. - We now have separate fuzzers for the inner layers of v3 onion
  993. service descriptors, to prevent future bugs like 40392. Closes
  994. ticket 40488.
  995. o Minor bugfix (CI, onion service):
  996. - Exclude onion service version 2 Stem tests in our CI. Fixes bug
  997. 40500; bugfix on 0.3.2.1-alpha.
  998. o Minor bugfix (logging):
  999. - Update a log notice dead URL to a working one. Fixes bug 40544;
  1000. bugfix on 0.3.5.1-alpha.
  1001. o Minor bugfix (pluggable transport):
  1002. - Do not kill a managed proxy if one of its transport configurations
  1003. emits a method error. Instead log a warning and continue processing
  1004. method arguments. Fixes bug 7362; bugfix on 0.2.3.6-alpha.
  1005. o Minor bugfix (relay):
  1006. - Remove the HSDir and HSIntro onion service v2 protocol versions so
  1007. relay stop advertising that they support them. Fixes bug 40509;
  1008. bugfix on 0.3.5.17.
  1009. o Minor bugfixes (bridges):
  1010. - When we don't yet have a descriptor for one of our bridges,
  1011. disable the entry guard retry schedule on that bridge. The entry
  1012. guard retry schedule and the bridge descriptor retry schedule can
  1013. conflict, e.g. where we mark a bridge as "maybe up" yet we don't
  1014. try to fetch its descriptor yet, leading Tor to wait (refusing to
  1015. do anything) until it becomes time to fetch the descriptor. Fixes
  1016. bug 40497; bugfix on 0.3.0.3-alpha.
  1017. o Minor bugfixes (cell scheduling):
  1018. - Avoid writing empty payload with NSS write.
  1019. - Don't attempt to write 0 bytes after a cell scheduling loop. No
  1020. empty payload was put on the wire. Fixes bug 40548; bugfix
  1021. on 0.3.5.1-alpha.
  1022. o Minor bugfixes (circuit padding):
  1023. - Don't send STOP circuit padding cells when the other side has
  1024. already shut down the corresponding padding machine. Fixes bug
  1025. 40435; bugfix on 0.4.0.1-alpha.
  1026. o Minor bugfixes (compatibility):
  1027. - Fix compatibility with the most recent Libevent versions, which no
  1028. longer have an evdns_set_random_bytes() function. Because this
  1029. function has been a no-op since Libevent 2.0.4-alpha, it is safe
  1030. for us to just stop calling it. Fixes bug 40371; bugfix
  1031. on 0.2.1.7-alpha.
  1032. o Minor bugfixes (compilation):
  1033. - Fix compilation error when __NR_time is not defined. Fixes bug
  1034. 40465; bugfix on 0.2.5.5-alpha. Patch by Daniel Pinto.
  1035. - Fix our configuration logic to detect whether we had OpenSSL 3:
  1036. previously, our logic was reversed. This has no other effect than
  1037. to change whether we suppress deprecated API warnings. Fixes bug
  1038. 40429; bugfix on 0.3.5.13.
  1039. - Resume being able to build on old / esoteric gcc versions. Fixes
  1040. bug 40550; bugfix on 0.4.7.1-alpha.
  1041. o Minor bugfixes (compiler warnings):
  1042. - Fix couple compiler warnings on latest Ubuntu Jammy. Fixes bug
  1043. 40516; bugfix on 0.3.5.1-alpha.
  1044. o Minor bugfixes (congestion control, client side logs):
  1045. - Demote a warn about 1-hop circuits using congestion control down
  1046. to info; Demote the 4-hop case to notice. Fixes bug 40598; bugfix
  1047. on 0.4.5-alpha.
  1048. o Minor bugfixes (control, sandbox):
  1049. - Allows the control command SAVECONF to succeed when the seccomp
  1050. sandbox is enabled. Makes SAVECONF keep only one backup file, to
  1051. simplify implementation. Fixes bug 40317; bugfix on 0.2.5.4-alpha.
  1052. Patch by Daniel Pinto.
  1053. o Minor bugfixes (controller, path bias):
  1054. - When a circuit's path is specified, in full or in part, from the
  1055. controller API, do not count that circuit towards our path-bias
  1056. calculations. (Doing so was incorrect, since we cannot tell
  1057. whether the controller is selecting relays randomly.) Resolves a
  1058. "Bug" warning. Fixes bug 40515; bugfix on 0.2.4.10-alpha.
  1059. o Minor bugfixes (dirauth, bandwidth scanner):
  1060. - Add the AuthDirDontVoteOnDirAuthBandwidth dirauth config parameter
  1061. to avoid voting on bandwidth scanner weights to v3 directory
  1062. authorities. Fixes bug 40471; bugfix on 0.2.2.1-alpha. Patch by
  1063. Neel Chauhan.
  1064. o Minor bugfixes (DNSPort, dormant mode):
  1065. - A request on the DNSPort now wakes up a dormant tor. Fixes bug
  1066. 40577; bugfix on 0.3.5.1-alpha.
  1067. o Minor bugfixes (fragile-hardening, sandbox):
  1068. - When building with --enable-fragile-hardening, add or relax Linux
  1069. seccomp rules to allow AddressSanitizer to execute normally if the
  1070. process terminates with the sandbox active. This has the side
  1071. effect of disabling the filtering of file- and directory-open
  1072. requests on most systems and dilutes the effectiveness of the
  1073. sandbox overall, as a wider range of system calls must be
  1074. permitted. Fixes bug 11477; bugfix on 0.2.5.4-alpha.
  1075. o Minor bugfixes (heartbeat):
  1076. - Adjust the heartbeat log message about distinct clients to
  1077. consider the HeartbeatPeriod rather than a flat 6-hour delay.
  1078. Fixes bug 40330; bugfix on 0.2.6.3-alpha.
  1079. o Minor bugfixes (logging):
  1080. - If a channel has never received or transmitted a cell, or seen a
  1081. client, do not calculate time diffs against 1/1/1970 but log a
  1082. better prettier message. Fixes bug 40182; bugfix on 0.2.4.4.
  1083. - When we no longer have enough directory information to use the
  1084. network, we would log a notice-level message -- but we would not
  1085. reliably log a message when we recovered and resumed using the
  1086. network. Now make sure there is always a corresponding message
  1087. about recovering. Fixes bug 40496; bugfix on 0.3.5.1-alpha.
  1088. o Minor bugfixes (logging, relay):
  1089. - Add spaces between the "and" when logging the "Your server has not
  1090. managed to confirm reachability for its" on dual-stack relays.
  1091. Fixes bug 40453; bugfix on 0.4.5.1-alpha. Patch by Neel Chauhan.
  1092. o Minor bugfixes (metrics port, onion service):
  1093. - Fix the metrics with a port label to be unique. Before this, all
  1094. ports of an onion service would be on the same line which violates
  1095. the Prometheus rules of unique labels. Fixes bug 40581; bugfix
  1096. on 0.4.5.1-alpha.
  1097. o Minor bugfixes (onion service congestion control):
  1098. - Avoid a non-fatal assertion failure in the case where we fail to
  1099. set up congestion control on a rendezvous circuit. This could
  1100. happen naturally if a cache entry expired at an unexpected time.
  1101. Fixes bug 40576; bugfix on 0.4.7.4-alpha.
  1102. o Minor bugfixes (onion service):
  1103. - Do not flag an HSDir as non-running in case the descriptor upload
  1104. or fetch fails. An onion service closes pending directory
  1105. connections before uploading a new descriptor which leads to
  1106. wrongly flagging many relays and thus affecting circuit path
  1107. selection. Fixes bug 40434; bugfix on 0.2.0.13-alpha.
  1108. - Fix a warning BUG that would occur often on heavily loaded onion
  1109. service leading to filling the logs with useless warnings. Fixes
  1110. bug 34083; bugfix on 0.3.2.1-alpha.
  1111. o Minor bugfixes (onion service, client):
  1112. - Fix a rare but fatal assertion failure due to a guard subsystem
  1113. recursion triggered by the onion service client. Fixes bug 40579;
  1114. bugfix on 0.3.5.1-alpha.
  1115. o Minor bugfixes (onion service, config):
  1116. - Fix a memory leak for a small config line string that could occur
  1117. if the onion service failed to be configured from file properly.
  1118. Fixes bug 40484; bugfix on 0.3.2.1-alpha.
  1119. o Minor bugfixes (onion service, TROVE-2021-008):
  1120. - Only log v2 access attempts once total, in order to not pollute
  1121. the logs with warnings and to avoid recording the times on disk
  1122. when v2 access was attempted. Note that the onion address was
  1123. _never_ logged. This counts as a Low-severity security issue.
  1124. Fixes bug 40474; bugfix on 0.4.5.8.
  1125. - Note that due to #40476 which removes v2 support entirely, this
  1126. log line is not emitted anymore. We still mention this in the
  1127. changelog because it is a Low-severity TROVE.
  1128. o Minor bugfixes (performance, DoS):
  1129. - Fix one case of a not-especially viable denial-of-service attack
  1130. found by OSS-Fuzz in our consensus-diff parsing code. This attack
  1131. causes a lot small of memory allocations and then immediately
  1132. frees them: this is only slow when running with all the sanitizers
  1133. enabled. Fixes one case of bug 40472; bugfix on 0.3.1.1-alpha.
  1134. o Minor bugfixes (relay):
  1135. - Reject IPv6-only DirPorts. Our reachability self-test forces
  1136. DirPorts to be IPv4, but our configuration parser allowed them to
  1137. be IPv6-only, which led to an assertion failure. Fixes bug 40494;
  1138. bugfix on 0.4.5.1-alpha.
  1139. o Minor bugfixes (relay, overload):
  1140. - Decide whether to signal overload based on a fraction and
  1141. assessment period of ntor handshake drops. Previously, a single
  1142. drop could trigger an overload state, which caused many false
  1143. positives. Fixes bug 40560; bugfix on 0.4.7.1-alpha.
  1144. o Minor bugfixes (sandbox):
  1145. - Fix the sandbox on i386 by modifying it to allow the
  1146. "clock_gettime64" and "statx" system calls and to filter the
  1147. "chown32" and "stat64" system calls in place of "chown" and
  1148. "stat", respectively. Fixes bug 40505; bugfix on 0.2.5.4-alpha.
  1149. o Minor bugfixes (statistics):
  1150. - Fix a fencepost issue when we check stability_last_downrated where
  1151. we called rep_hist_downrate_old_runs() twice. Fixes bug 40394;
  1152. bugfix on 0.2.0.5-alpha. Patch by Neel Chauhan.
  1153. o Minor bugfixes (tests):
  1154. - Fix a bug that prevented some tests from running with the correct
  1155. names. Fixes bug 40365; bugfix on 0.4.3.1-alpha.
  1156. o Minor bugfixes (usability):
  1157. - Do not log "RENDEZVOUS1 cell with unrecognized rendezvous cookie"
  1158. at LOG_PROTOCOL_WARN; instead log it at DEBUG. This warning can
  1159. happen naturally if a client gives up on a rendezvous circuit
  1160. after sending INTRODUCE1. Fixes part of bug 40400; bugfix
  1161. on 0.1.1.13-alpha.
  1162. - Do not log "circuit_receive_relay_cell failed" at
  1163. LOG_PROTOCOL_WARN; instead log it at DEBUG. In every case where we
  1164. would want to log this as a protocol warning, we are already
  1165. logging another warning from inside circuit_receive_relay_cell.
  1166. Fixes part of bug 40400; bugfix on 0.1.1.9-alpha.
  1167. o Code simplification and refactoring:
  1168. - Lower the official maximum for "guard-extreme-restriction-percent"
  1169. to 100. This has no effect on when the guard code will generate a
  1170. warning, but it makes the intent of the option clearer. Fixes bug
  1171. 40486; bugfix on 0.3.0.1-alpha.
  1172. o Documentation:
  1173. - Add links to original tor design paper and anonbib to
  1174. docs/HACKING/README.1st.md. Closes ticket 33742. Patch from
  1175. Emily Bones.
  1176. - Describe the "fingerprint-ed25519" file in the tor.1 man page.
  1177. Fixes bug 40467; bugfix on 0.4.3.1-alpha. Patch by Neel Chauhan.
  1178. - Provide an improved version of the tor-exit-notice.html file for
  1179. exit relays to use as a landing page. The text is unchanged, but
  1180. the page design and layout are significantly modernized, and
  1181. several links are fixed. Patch from "n_user"; closes ticket 40529.
  1182. o Testing:
  1183. - Add unit tests for the Linux seccomp sandbox. Resolves
  1184. issue 16803.
  1185. o Code simplification and refactoring (rust):
  1186. - Remove Rust support and its associated code. It is unsupported and
  1187. Rust focus should be shifted to arti. Closes ticket 40469.
  1188. o Documentation (man, relay):
  1189. - Missing "OverloadStatistics" in tor.1 manpage. Fixes bug 40504;
  1190. bugfix on 0.4.6.1-alpha.
  1191. o Testing (CI, chutney):
  1192. - Bump the data size that chutney transmits to 5MBytes in order to
  1193. trigger the flow control and congestion window code. Closes
  1194. ticket 40485.
  1195. Changes in version 0.4.6.10 - 2022-02-04
  1196. This version contains minor bugfixes but one in particular is that relays
  1197. don't advertise onion service v2 support at the protocol version level.
  1198. o Minor features (fallbackdir):
  1199. - Regenerate fallback directories generated on February 04, 2022.
  1200. o Minor features (geoip data):
  1201. - Update the geoip files to match the IPFire Location Database, as
  1202. retrieved on 2022/02/04.
  1203. o Minor bugfix (logging):
  1204. - Update a log notice dead URL to a working one. Fixes bug 40544;
  1205. bugfix on 0.3.5.1-alpha.
  1206. o Minor bugfix (relay):
  1207. - Remove the HSDir and HSIntro onion service v2 protocol versions so
  1208. relay stop advertising that they support them. Fixes bug 40509;
  1209. bugfix on 0.3.5.17.
  1210. o Minor bugfixes (MetricsPort, Prometheus):
  1211. - Add double quotes to the label values of the onion service
  1212. metrics. Fixes bug 40552; bugfix on 0.4.5.1-alpha.
  1213. Changes in version 0.4.6.9 - 2021-12-15
  1214. This version fixes several bugs from earlier versions of Tor. One important
  1215. piece is the removal of DNS timeout metric from the overload general signal.
  1216. See below for more details.
  1217. o Major bugfixes (relay, overload):
  1218. - Don't make Tor DNS timeout trigger an overload general state.
  1219. These timeouts are different from DNS server timeout. They have to
  1220. be seen as timeout related to UX and not because of a network
  1221. problem. Fixes bug 40527; bugfix on 0.4.6.1-alpha.
  1222. o Minor feature (reproducible build):
  1223. - The repository can now build reproducible tarballs which adds the
  1224. build command "make dist-reprod" for that purpose. Closes
  1225. ticket 26299.
  1226. o Minor features (compilation):
  1227. - Give an error message if trying to build with a version of
  1228. LibreSSL known not to work with Tor. (There's an incompatibility
  1229. with LibreSSL versions 3.2.1 through 3.4.0 inclusive because of
  1230. their incompatibility with OpenSSL 1.1.1's TLSv1.3 APIs.) Closes
  1231. ticket 40511.
  1232. o Minor features (fallbackdir):
  1233. - Regenerate fallback directories generated on December 15, 2021.
  1234. o Minor features (geoip data):
  1235. - Update the geoip files to match the IPFire Location Database, as
  1236. retrieved on 2021/12/15.
  1237. o Minor bugfixes (compilation):
  1238. - Fix our configuration logic to detect whether we had OpenSSL 3:
  1239. previously, our logic was reversed. This has no other effect than
  1240. to change whether we suppress deprecated API warnings. Fixes bug
  1241. 40429; bugfix on 0.3.5.13.
  1242. o Minor bugfixes (relay):
  1243. - Reject IPv6-only DirPorts. Our reachability self-test forces
  1244. DirPorts to be IPv4, but our configuration parser allowed them to
  1245. be IPv6-only, which led to an assertion failure. Fixes bug 40494;
  1246. bugfix on 0.4.5.1-alpha.
  1247. o Documentation (man, relay):
  1248. - Missing "OverloadStatistics" in tor.1 manpage. Fixes bug 40504;
  1249. bugfix on 0.4.6.1-alpha.
  1250. Changes in version 0.4.6.8 - 2021-10-26
  1251. This version fixes several bugs from earlier versions of Tor. One
  1252. highlight is a fix on how we track DNS timeouts to report general
  1253. relay overload.
  1254. o Major bugfixes (relay, overload state):
  1255. - Relays report the general overload state for DNS timeout errors
  1256. only if X% of all DNS queries over Y seconds are errors. Before
  1257. that, it only took 1 timeout to report the overload state which
  1258. was just too low of a threshold. The X and Y values are 1% and 10
  1259. minutes respectively but they are also controlled by consensus
  1260. parameters. Fixes bug 40491; bugfix on 0.4.6.1-alpha.
  1261. o Minor features (fallbackdir):
  1262. - Regenerate fallback directories for October 2021. Closes
  1263. ticket 40493.
  1264. o Minor features (testing):
  1265. - On a testing network, relays can now use the
  1266. TestingMinTimeToReportBandwidth option to change the smallest
  1267. amount of time over which they're willing to report their observed
  1268. maximum bandwidth. Previously, this was fixed at 1 day. For
  1269. safety, values under 2 hours are only supported on testing
  1270. networks. Part of a fix for ticket 40337.
  1271. - Relays on testing networks no longer rate-limit how frequently
  1272. they are willing to report new bandwidth measurements. Part of a
  1273. fix for ticket 40337.
  1274. - Relays on testing networks now report their observed bandwidths
  1275. immediately from startup. Previously, they waited until they had
  1276. been running for a full day. Closes ticket 40337.
  1277. o Minor bugfix (onion service):
  1278. - Do not flag an HSDir as non-running in case the descriptor upload
  1279. or fetch fails. An onion service closes pending directory
  1280. connections before uploading a new descriptor which can thus lead
  1281. to wrongly flagging many relays and thus affecting circuit building
  1282. path selection. Fixes bug 40434; bugfix on 0.2.0.13-alpha.
  1283. - Improve logging when a bad HS version is given. Fixes bug 40476;
  1284. bugfix on 0.4.6.1-alpha.
  1285. o Minor bugfix (CI, onion service):
  1286. - Exclude onion service version 2 Stem tests in our CI. Fixes bug 40500;
  1287. bugfix on 0.3.2.1-alpha.
  1288. o Minor bugfixes (compatibility):
  1289. - Fix compatibility with the most recent Libevent versions, which no
  1290. longer have an evdns_set_random_bytes() function. Because this
  1291. function has been a no-op since Libevent 2.0.4-alpha, it is safe
  1292. for us to just stop calling it. Fixes bug 40371; bugfix
  1293. on 0.2.1.7-alpha.
  1294. o Minor bugfixes (onion service, TROVE-2021-008):
  1295. - Only log v2 access attempts once total, in order to not pollute
  1296. the logs with warnings and to avoid recording the times on disk
  1297. when v2 access was attempted. Note that the onion address was
  1298. _never_ logged. This counts as a Low-severity security issue.
  1299. Fixes bug 40474; bugfix on 0.4.5.8.
  1300. Changes in version 0.4.5.11 - 2021-10-26
  1301. The major change in this version is that v2 onion services are now
  1302. disabled at the client, service, and relay: any Tor nodes running this
  1303. version and onward will stop supporting v2 onion services. This is the
  1304. last step in the long deprecation process of v2 onion services.
  1305. Everyone running an earlier version, whether as a client, a relay, or
  1306. an onion service, should upgrade to Tor 0.3.5.17, 0.4.5.11,
  1307. or 0.4.6.8.
  1308. o Major feature (onion service v2):
  1309. - See https://blog.torproject.org/v2-deprecation-timeline for
  1310. details on how to transition from v2 to v3.
  1311. - The control port commands HSFETCH and HSPOST no longer allow
  1312. version 2, and it is no longer possible to create a v2 service
  1313. with ADD_ONION.
  1314. - Tor no longer allows creating v2 services, or connecting as a
  1315. client to a v2 service. Relays will decline to be a v2 HSDir or
  1316. introduction point. This effectively disables onion service
  1317. version 2 Tor-wide. Closes ticket 40476.
  1318. o Minor features (bridge, backport from 0.4.6.8):
  1319. - We now announce the URL to Tor's new bridge status at
  1320. https://bridges.torproject.org/ when Tor is configured to run as a
  1321. bridge relay. Closes ticket 30477.
  1322. o Minor features (fallbackdir):
  1323. - Regenerate fallback directories for October 2021. Closes
  1324. ticket 40493.
  1325. o Minor features (logging, diagnostic, backport from 0.4.6.5):
  1326. - Log decompression failures at a higher severity level, since they
  1327. can help provide missing context for other warning messages. We
  1328. rate-limit these messages, to avoid flooding the logs if they
  1329. begin to occur frequently. Closes ticket 40175.
  1330. o Minor features (testing, backport from 0.4.6.8):
  1331. - On a testing network, relays can now use the
  1332. TestingMinTimeToReportBandwidth option to change the smallest
  1333. amount of time over which they're willing to report their observed
  1334. maximum bandwidth. Previously, this was fixed at 1 day. For
  1335. safety, values under 2 hours are only supported on testing
  1336. networks. Part of a fix for ticket 40337.
  1337. - Relays on testing networks no longer rate-limit how frequently
  1338. they are willing to report new bandwidth measurements. Part of a
  1339. fix for ticket 40337.
  1340. - Relays on testing networks now report their observed bandwidths
  1341. immediately from startup. Previously, they waited until they had
  1342. been running for a full day. Closes ticket 40337.
  1343. o Minor bugfix (CI, onion service):
  1344. - Exclude onion service version 2 Stem tests in our CI. Fixes bug 40500;
  1345. bugfix on 0.3.2.1-alpha.
  1346. o Minor bugfix (onion service, backport from 0.4.6.8):
  1347. - Do not flag an HSDir as non-running in case the descriptor upload
  1348. or fetch fails. An onion service closes pending directory
  1349. connections before uploading a new descriptor which can thus lead
  1350. to wrongly flagging many relays and thus affecting circuit building
  1351. path selection. Fixes bug 40434; bugfix on 0.2.0.13-alpha.
  1352. o Minor bugfixes (compatibility, backport from 0.4.6.8):
  1353. - Fix compatibility with the most recent Libevent versions, which no
  1354. longer have an evdns_set_random_bytes() function. Because this
  1355. function has been a no-op since Libevent 2.0.4-alpha, it is safe
  1356. for us to just stop calling it. Fixes bug 40371; bugfix
  1357. on 0.2.1.7-alpha.
  1358. o Minor bugfixes (consensus handling, backport from 0.4.6.4-rc):
  1359. - Avoid a set of bugs that could be caused by inconsistently
  1360. preferring an out-of-date consensus stored in a stale directory
  1361. cache over a more recent one stored on disk as the latest
  1362. consensus. Fixes bug 40375; bugfix on 0.3.1.1-alpha.
  1363. o Minor bugfixes (onion service, TROVE-2021-008, backport from 0.4.6.8):
  1364. - Only log v2 access attempts once total, in order to not pollute
  1365. the logs with warnings and to avoid recording the times on disk
  1366. when v2 access was attempted. Note that the onion address was
  1367. _never_ logged. This counts as a Low-severity security issue.
  1368. Fixes bug 40474; bugfix on 0.4.5.8.
  1369. Changes in version 0.3.5.17 - 2021-10-26
  1370. The major change in this version is that v2 onion services are now
  1371. disabled at the client, service, and relay: any Tor nodes running this
  1372. version and onward will stop supporting v2 onion services. This is the
  1373. last step in the long deprecation process of v2 onion services.
  1374. Everyone running an earlier version, whether as a client, a relay, or
  1375. an onion service, should upgrade to Tor 0.3.5.17, 0.4.5.11,
  1376. or 0.4.6.8.
  1377. o Major feature (onion service v2, backport from 0.4.5.11):
  1378. - See https://blog.torproject.org/v2-deprecation-timeline for
  1379. details on how to transition from v2 to v3.
  1380. - The control port commands HSFETCH and HSPOST no longer allow
  1381. version 2, and it is no longer possible to create a v2 service
  1382. with ADD_ONION.
  1383. - Tor no longer allows creating v2 services, or connecting as a
  1384. client to a v2 service. Relays will decline to be a v2 HSDir or
  1385. introduction point. This effectively disables onion service
  1386. version 2 Tor-wide. Closes ticket 40476.
  1387. o Minor features (bridge, backport from 0.4.6.8):
  1388. - We now announce the URL to Tor's new bridge status at
  1389. https://bridges.torproject.org/ when Tor is configured to run as a
  1390. bridge relay. Closes ticket 30477.
  1391. o Minor features (fallbackdir):
  1392. - Regenerate fallback directories for October 2021. Closes
  1393. ticket 40493.
  1394. o Minor bugfixes (compatibility, backport from 0.4.6.8):
  1395. - Fix compatibility with the most recent Libevent versions, which no
  1396. longer have an evdns_set_random_bytes() function. Because this
  1397. function has been a no-op since Libevent 2.0.4-alpha, it is safe
  1398. for us to just stop calling it. Fixes bug 40371; bugfix
  1399. on 0.2.1.7-alpha.
  1400. Changes in version 0.4.6.7 - 2021-08-16
  1401. This version fixes several bugs from earlier versions of Tor, including one
  1402. that could lead to a denial-of-service attack. Everyone running an earlier
  1403. version, whether as a client, a relay, or an onion service, should upgrade
  1404. to Tor 0.3.5.16, 0.4.5.10, or 0.4.6.7.
  1405. o Major bugfixes (cryptography, security):
  1406. - Resolve an assertion failure caused by a behavior mismatch between our
  1407. batch-signature verification code and our single-signature verification
  1408. code. This assertion failure could be triggered remotely, leading to a
  1409. denial of service attack. We fix this issue by disabling batch
  1410. verification. Fixes bug 40078; bugfix on 0.2.6.1-alpha. This issue is
  1411. also tracked as TROVE-2021-007 and CVE-2021-38385. Found by Henry de
  1412. Valence.
  1413. o Minor feature (fallbackdir):
  1414. - Regenerate fallback directories list. Close ticket 40447.
  1415. o Minor features (geoip data):
  1416. - Update the geoip files to match the IPFire Location Database,
  1417. as retrieved on 2021/08/12.
  1418. o Minor bugfix (crypto):
  1419. - Disable the unused batch verification feature of ed25519-donna. Fixes
  1420. bug 40078; bugfix on 0.2.6.1-alpha. Found by Henry de Valence.
  1421. o Minor bugfixes (onion service):
  1422. - Send back the extended SOCKS error 0xF6 (Onion Service Invalid Address)
  1423. for a v2 onion address. Fixes bug 40421; bugfix on 0.4.6.2-alpha.
  1424. o Minor bugfix (CI, onion service):
  1425. - Exclude onion service version 2 Stem tests in our CI. Fixes bug 40500;
  1426. bugfix on 0.3.2.1-alpha.
  1427. o Minor bugfixes (relay):
  1428. - Reduce the compression level for data streaming from HIGH to LOW in
  1429. order to reduce CPU load on the directory relays. Fixes bug 40301;
  1430. bugfix on 0.3.5.1-alpha.
  1431. o Minor bugfixes (timekeeping):
  1432. - Calculate the time of day correctly on systems where the time_t
  1433. type includes leap seconds. (This is not the case on most
  1434. operating systems, but on those where it occurs, our tor_timegm
  1435. function did not correctly invert the system's gmtime function,
  1436. which could result in assertion failures when calculating
  1437. voting schedules.) Fixes bug 40383; bugfix on 0.2.0.3-alpha.
  1438. Changes in version 0.4.5.10 - 2021-08-16
  1439. This version fixes several bugs from earlier versions of Tor, including one
  1440. that could lead to a denial-of-service attack. Everyone running an earlier
  1441. version, whether as a client, a relay, or an onion service, should upgrade
  1442. to Tor 0.3.5.16, 0.4.5.10, or 0.4.6.7.
  1443. o Major bugfixes (cryptography, security):
  1444. - Resolve an assertion failure caused by a behavior mismatch between our
  1445. batch-signature verification code and our single-signature verification
  1446. code. This assertion failure could be triggered remotely, leading to a
  1447. denial of service attack. We fix this issue by disabling batch
  1448. verification. Fixes bug 40078; bugfix on 0.2.6.1-alpha. This issue is
  1449. also tracked as TROVE-2021-007 and CVE-2021-38385. Found by Henry de
  1450. Valence.
  1451. o Minor feature (fallbackdir):
  1452. - Regenerate fallback directories list. Close ticket 40447.
  1453. o Minor features (geoip data):
  1454. - Update the geoip files to match the IPFire Location Database,
  1455. as retrieved on 2021/08/12.
  1456. o Minor features (testing):
  1457. - Enable the deterministic RNG for unit tests that covers the address set
  1458. bloomfilter-based API's. Fixes bug 40419; bugfix on 0.3.3.2-alpha.
  1459. o Minor bugfix (crypto):
  1460. - Disable the unused batch verification feature of ed25519-donna. Fixes
  1461. bug 40078; bugfix on 0.2.6.1-alpha. Found by Henry de Valence.
  1462. o Minor bugfixes (relay, backport from 0.4.6.x):
  1463. - Reduce the compression level for data streaming from HIGH to LOW. Fixes
  1464. bug 40301; bugfix on 0.3.5.1-alpha.
  1465. o Minor bugfixes (timekeeping, backport from 0.4.6.x):
  1466. - Calculate the time of day correctly on systems where the time_t
  1467. type includes leap seconds. (This is not the case on most
  1468. operating systems, but on those where it occurs, our tor_timegm
  1469. function did not correctly invert the system's gmtime function,
  1470. which could result in assertion failures when calculating
  1471. voting schedules.) Fixes bug 40383; bugfix on 0.2.0.3-alpha.
  1472. o Minor bugfixes (warnings, portability, backport from 0.4.6.x):
  1473. - Suppress a strict-prototype warning when building with some versions
  1474. of NSS. Fixes bug 40409; bugfix on 0.3.5.1-alpha.
  1475. Changes in version 0.3.5.16 - 2021-08-16
  1476. This version fixes several bugs from earlier versions of Tor, including one
  1477. that could lead to a denial-of-service attack. Everyone running an earlier
  1478. version, whether as a client, a relay, or an onion service, should upgrade
  1479. to Tor 0.3.5.16, 0.4.5.10, or 0.4.6.7.
  1480. o Major bugfixes (cryptography, security):
  1481. - Resolve an assertion failure caused by a behavior mismatch between our
  1482. batch-signature verification code and our single-signature verification
  1483. code. This assertion failure could be triggered remotely, leading to a
  1484. denial of service attack. We fix this issue by disabling batch
  1485. verification. Fixes bug 40078; bugfix on 0.2.6.1-alpha. This issue is
  1486. also tracked as TROVE-2021-007 and CVE-2021-38385. Found by Henry de
  1487. Valence.
  1488. o Minor feature (fallbackdir):
  1489. - Regenerate fallback directories list. Close ticket 40447.
  1490. o Minor features (geoip data):
  1491. - Update the geoip files to match the IPFire Location Database,
  1492. as retrieved on 2021/08/12.
  1493. o Minor bugfix (crypto):
  1494. - Disable the unused batch verification feature of ed25519-donna. Fixes
  1495. bug 40078; bugfix on 0.2.6.1-alpha. Found by Henry de Valence.
  1496. o Minor bugfixes (relay, backport from 0.4.6.x):
  1497. - Reduce the compression level for data streaming from HIGH to LOW. Fixes
  1498. bug 40301; bugfix on 0.3.5.1-alpha.
  1499. Changes in version 0.4.6.6 - 2021-06-30
  1500. Tor 0.4.6.6 makes several small fixes on 0.4.6.5, including one that
  1501. allows Tor to build correctly on older versions of GCC. You should
  1502. upgrade to this version if you were having trouble building Tor
  1503. 0.4.6.5; otherwise, there is probably no need.
  1504. o Minor bugfixes (compilation):
  1505. - Fix a compilation error when trying to build Tor with a compiler
  1506. that does not support const variables in static initializers.
  1507. Fixes bug 40410; bugfix on 0.4.6.5.
  1508. - Suppress a strict-prototype warning when building with some
  1509. versions of NSS. Fixes bug 40409; bugfix on 0.3.5.1-alpha.
  1510. o Minor bugfixes (testing):
  1511. - Enable the deterministic RNG for unit tests that covers the
  1512. address set bloomfilter-based API's. Fixes bug 40419; bugfix
  1513. on 0.3.3.2-alpha.
  1514. Changes in version 0.4.6.5 - 2021-06-14
  1515. Tor 0.4.6.5 is the first stable release in its series. The 0.4.6.x
  1516. series includes numerous features and bugfixes, including a significant
  1517. improvement to our circuit timeout algorithm that should improve
  1518. observed client performance, and a way for relays to report when they are
  1519. overloaded.
  1520. This release also includes security fixes for several security issues,
  1521. including a denial-of-service attack against onion service clients,
  1522. and another denial-of-service attack against relays. Everybody should
  1523. upgrade to one of 0.3.5.15, 0.4.4.9, 0.4.5.9, or 0.4.6.5.
  1524. Below are the changes since 0.4.5.8. For a list of changes since
  1525. 0.4.6.4-rc, see the ChangeLog file.
  1526. o Major bugfixes (security):
  1527. - Don't allow relays to spoof RELAY_END or RELAY_RESOLVED cell on
  1528. half-closed streams. Previously, clients failed to validate which
  1529. hop sent these cells: this would allow a relay on a circuit to end
  1530. a stream that wasn't actually built with it. Fixes bug 40389;
  1531. bugfix on 0.3.5.1-alpha. This issue is also tracked as TROVE-2021-
  1532. 003 and CVE-2021-34548.
  1533. o Major bugfixes (security, defense-in-depth):
  1534. - Detect more failure conditions from the OpenSSL RNG code.
  1535. Previously, we would detect errors from a missing RNG
  1536. implementation, but not failures from the RNG code itself.
  1537. Fortunately, it appears those failures do not happen in practice
  1538. when Tor is using OpenSSL's default RNG implementation. Fixes bug
  1539. 40390; bugfix on 0.2.8.1-alpha. This issue is also tracked as
  1540. TROVE-2021-004. Reported by Jann Horn at Google's Project Zero.
  1541. o Major bugfixes (security, denial of service):
  1542. - Resist a hashtable-based CPU denial-of-service attack against
  1543. relays. Previously we used a naive unkeyed hash function to look
  1544. up circuits in a circuitmux object. An attacker could exploit this
  1545. to construct circuits with chosen circuit IDs, to create
  1546. collisions and make the hash table inefficient. Now we use a
  1547. SipHash construction here instead. Fixes bug 40391; bugfix on
  1548. 0.2.4.4-alpha. This issue is also tracked as TROVE-2021-005 and
  1549. CVE-2021-34549. Reported by Jann Horn from Google's Project Zero.
  1550. - Fix an out-of-bounds memory access in v3 onion service descriptor
  1551. parsing. An attacker could exploit this bug by crafting an onion
  1552. service descriptor that would crash any client that tried to visit
  1553. it. Fixes bug 40392; bugfix on 0.3.0.1-alpha. This issue is also
  1554. tracked as TROVE-2021-006 and CVE-2021-34550. Reported by Sergei
  1555. Glazunov from Google's Project Zero.
  1556. o Major features (control port, onion services):
  1557. - Add controller support for creating version 3 onion services with
  1558. client authorization. Previously, only v2 onion services could be
  1559. created with client authorization. Closes ticket 40084. Patch by
  1560. Neel Chauhan.
  1561. o Major features (directory authority):
  1562. - When voting on a relay with a Sybil-like appearance, add the Sybil
  1563. flag when clearing out the other flags. This lets a relay operator
  1564. know why their relay hasn't been included in the consensus. Closes
  1565. ticket 40255. Patch by Neel Chauhan.
  1566. o Major features (metrics):
  1567. - Relays now report how overloaded they are in their extrainfo
  1568. documents. This information is controlled with the
  1569. OverloadStatistics torrc option, and it will be used to improve
  1570. decisions about the network's load balancing. Implements proposal
  1571. 328; closes ticket 40222.
  1572. o Major features (relay, denial of service):
  1573. - Add a new DoS subsystem feature to control the rate of client
  1574. connections for relays. Closes ticket 40253.
  1575. o Major features (statistics):
  1576. - Relays now publish statistics about the number of v3 onion
  1577. services and volume of v3 onion service traffic, in the same
  1578. manner they already do for v2 onions. Closes ticket 23126.
  1579. o Major bugfixes (circuit build timeout):
  1580. - Improve the accuracy of our circuit build timeout calculation for
  1581. 60%, 70%, and 80% build rates for various guard choices. We now
  1582. use a maximum likelihood estimator for Pareto parameters of the
  1583. circuit build time distribution, instead of a "right-censored
  1584. estimator". This causes clients to ignore circuits that never
  1585. finish building in their timeout calculations. Previously, clients
  1586. were counting such unfinished circuits as having the highest
  1587. possible build time value, when in reality these circuits most
  1588. likely just contain relays that are offline. We also now wait a
  1589. bit longer to let circuits complete for measurement purposes,
  1590. lower the minimum possible effective timeout from 1.5 seconds to
  1591. 10ms, and increase the resolution of the circuit build time
  1592. histogram from 50ms bin widths to 10ms bin widths. Additionally,
  1593. we alter our estimate Xm by taking the maximum of the top 10 most
  1594. common build time values of the 10ms histogram, and compute Xm as
  1595. the average of these. Fixes bug 40168; bugfix on 0.2.2.14-alpha.
  1596. - Remove max_time calculation and associated warning from circuit
  1597. build timeout 'alpha' parameter estimation, as this is no longer
  1598. needed by our new estimator from 40168. Fixes bug 34088; bugfix
  1599. on 0.2.2.9-alpha.
  1600. o Major bugfixes (signing key):
  1601. - In the tor-gencert utility, give an informative error message if
  1602. the passphrase given in `--create-identity-key` is too short.
  1603. Fixes bug 40189; bugfix on 0.2.0.1-alpha. Patch by Neel Chauhan.
  1604. o Minor features (bridge):
  1605. - We now announce the URL to Tor's new bridge status at
  1606. https://bridges.torproject.org/ when Tor is configured to run as a
  1607. bridge relay. Closes ticket 30477.
  1608. o Minor features (build system):
  1609. - New "make lsp" command to auto generate the compile_commands.json
  1610. file used by the ccls server. The "bear" program is needed for
  1611. this. Closes ticket 40227.
  1612. o Minor features (client):
  1613. - Clients now check whether their streams are attempting to re-enter
  1614. the Tor network (i.e. to send Tor traffic over Tor), and close
  1615. them preemptively if they think exit relays will refuse them for
  1616. this reason. See ticket 2667 for details. Closes ticket 40271.
  1617. o Minor features (command line):
  1618. - Add long format name "--torrc-file" equivalent to the existing
  1619. command-line option "-f". Closes ticket 40324. Patch by
  1620. Daniel Pinto.
  1621. o Minor features (command-line interface):
  1622. - Add build informations to `tor --version` in order to ease
  1623. reproducible builds. Closes ticket 32102.
  1624. - When parsing command-line flags that take an optional argument,
  1625. treat the argument as absent if it would start with a '-'
  1626. character. Arguments in that form are not intelligible for any of
  1627. our optional-argument flags. Closes ticket 40223.
  1628. - Allow a relay operator to list the ed25519 keys on the command
  1629. line by adding the `rsa` and `ed25519` arguments to the
  1630. --list-fingerprint flag to show the respective RSA and ed25519
  1631. relay fingerprint. Closes ticket 33632. Patch by Neel Chauhan.
  1632. o Minor features (compatibility):
  1633. - Remove an assertion function related to TLS renegotiation. It was
  1634. used nowhere outside the unit tests, and it was breaking
  1635. compilation with recent alpha releases of OpenSSL 3.0.0. Closes
  1636. ticket 40399.
  1637. o Minor features (control port, stream handling):
  1638. - Add the stream ID to the event line in the ADDRMAP control event.
  1639. Closes ticket 40249. Patch by Neel Chauhan.
  1640. o Minor features (dormant mode):
  1641. - Add a new 'DormantTimeoutEnabled' option to allow coarse-grained
  1642. control over whether the client ever becomes dormant from
  1643. inactivity. Most people won't need this. Closes ticket 40228.
  1644. - Add a new 'DormantTimeoutEnabled' option for coarse-grained
  1645. control over whether the client can become dormant from
  1646. inactivity. Most people won't need this. Closes ticket 40228.
  1647. o Minor features (geoip data):
  1648. - Update the geoip files to match the IPFire Location Database, as
  1649. retrieved on 2021/06/10.
  1650. o Minor features (logging):
  1651. - Edit heartbeat log messages so that more of them begin with the
  1652. string "Heartbeat: ". Closes ticket 40322; patch
  1653. from 'cypherpunks'.
  1654. - Change the DoS subsystem heartbeat line format to be more clear on
  1655. what has been detected/rejected, and which option is disabled (if
  1656. any). Closes ticket 40308.
  1657. - In src/core/mainloop/mainloop.c and src/core/mainloop/connection.c,
  1658. put brackets around IPv6 addresses in log messages. Closes ticket
  1659. 40232. Patch by Neel Chauhan.
  1660. o Minor features (logging, diagnostic):
  1661. - Log decompression failures at a higher severity level, since they
  1662. can help provide missing context for other warning messages. We
  1663. rate-limit these messages, to avoid flooding the logs if they
  1664. begin to occur frequently. Closes ticket 40175.
  1665. o Minor features (onion services):
  1666. - Add a warning message when trying to connect to (no longer
  1667. supported) v2 onion services. Closes ticket 40373.
  1668. o Minor features (performance, windows):
  1669. - Use SRWLocks to implement locking on Windows. Replaces the
  1670. "critical section" locking implementation with the faster
  1671. SRWLocks, available since Windows Vista. Closes ticket 17927.
  1672. Patch by Daniel Pinto.
  1673. o Minor features (protocol, proxy support, defense in depth):
  1674. - Close HAProxy connections if they somehow manage to send us data
  1675. before we start reading. Closes another case of ticket 40017.
  1676. o Minor features (tests, portability):
  1677. - Port the hs_build_address.py test script to work with recent
  1678. versions of python. Closes ticket 40213. Patch from
  1679. Samanta Navarro.
  1680. o Minor features (vote document):
  1681. - Add a "stats" line to directory authority votes, to report various
  1682. statistics that authorities compute about the relays. This will
  1683. help us diagnose the network better. Closes ticket 40314.
  1684. o Minor bugfixes (build):
  1685. - The configure script now shows whether or not lzma and zstd have
  1686. been used, not just if the enable flag was passed in. Fixes bug
  1687. 40236; bugfix on 0.4.3.1-alpha.
  1688. o Minor bugfixes (compatibility):
  1689. - Fix a failure in the test cases when running on the "hppa"
  1690. architecture, along with a related test that might fail on other
  1691. architectures in the future. Fixes bug 40274; bugfix
  1692. on 0.2.5.1-alpha.
  1693. o Minor bugfixes (compilation):
  1694. - Fix a compilation warning about unused functions when building
  1695. with a libc that lacks the GLOB_ALTDIRFUNC constant. Fixes bug
  1696. 40354; bugfix on 0.4.5.1-alpha. Patch by Daniel Pinto.
  1697. o Minor bugfixes (consensus handling):
  1698. - Avoid a set of bugs that could be caused by inconsistently
  1699. preferring an out-of-date consensus stored in a stale directory
  1700. cache over a more recent one stored on disk as the latest
  1701. consensus. Fixes bug 40375; bugfix on 0.3.1.1-alpha.
  1702. o Minor bugfixes (control, sandbox):
  1703. - Allow the control command SAVECONF to succeed when the seccomp
  1704. sandbox is enabled, and make SAVECONF keep only one backup file to
  1705. simplify implementation. Previously SAVECONF allowed a large
  1706. number of backup files, which made it incompatible with the
  1707. sandbox. Fixes bug 40317; bugfix on 0.2.5.4-alpha. Patch by
  1708. Daniel Pinto.
  1709. o Minor bugfixes (directory authorities, voting):
  1710. - Add a new consensus method (31) to support any future changes that
  1711. authorities decide to make to the value of bwweightscale or
  1712. maxunmeasuredbw. Previously, there was a bug that prevented the
  1713. authorities from parsing these consensus parameters correctly under
  1714. most circumstances. Fixes bug 19011; bugfix on 0.2.2.10-alpha.
  1715. o Minor bugfixes (ipv6):
  1716. - Allow non-SOCKSPorts to disable IPv4, IPv6, and PreferIPv4. Some
  1717. rare configurations might break, but in this case you can disable
  1718. NoIPv4Traffic and NoIPv6Traffic as needed. Fixes bug 33607; bugfix
  1719. on 0.4.1.1-alpha. Patch by Neel Chauhan.
  1720. o Minor bugfixes (key generation):
  1721. - Do not require a valid torrc when using the `--keygen` argument to
  1722. generate a signing key. This allows us to generate keys on systems
  1723. or users which may not run Tor. Fixes bug 40235; bugfix on
  1724. 0.2.7.2-alpha. Patch by Neel Chauhan.
  1725. o Minor bugfixes (logging, relay):
  1726. - Emit a warning if an Address is found to be internal and tor can't
  1727. use it. Fixes bug 40290; bugfix on 0.4.5.1-alpha.
  1728. o Minor bugfixes (metrics port):
  1729. - Fix a bug that made tor try to re-bind() on an already open
  1730. MetricsPort every 60 seconds. Fixes bug 40370; bugfix
  1731. on 0.4.5.1-alpha.
  1732. o Minor bugfixes (onion services, logging):
  1733. - Downgrade the severity of a few rendezvous circuit-related
  1734. warnings from warning to info. Fixes bug 40207; bugfix on
  1735. 0.3.2.1-alpha. Patch by Neel Chauhan.
  1736. o Minor bugfixes (relay):
  1737. - Reduce the compression level for data streaming from HIGH to LOW.
  1738. This should reduce the CPU and memory burden for directory caches.
  1739. Fixes bug 40301; bugfix on 0.3.5.1-alpha.
  1740. o Minor bugfixes (testing, BSD):
  1741. - Fix pattern-matching errors when patterns expand to invalid paths
  1742. on BSD systems. Fixes bug 40318; bugfix on 0.4.5.1-alpha. Patch by
  1743. Daniel Pinto.
  1744. o Code simplification and refactoring:
  1745. - Remove the orconn_ext_or_id_map structure and related functions.
  1746. (Nothing outside of unit tests used them.) Closes ticket 33383.
  1747. Patch by Neel Chauhan.
  1748. o Removed features:
  1749. - Remove unneeded code for parsing private keys in directory
  1750. documents. This code was only used for client authentication in v2
  1751. onion services, which are now unsupported. Closes ticket 40374.
  1752. - As of this release, Tor no longer supports the old v2 onion
  1753. services. They were deprecated last July for security, and support
  1754. will be removed entirely later this year. We strongly encourage
  1755. everybody to migrate to v3 onion services. For more information,
  1756. see https://blog.torproject.org/v2-deprecation-timeline . Closes
  1757. ticket 40266. (NOTE: We accidentally released an earlier version
  1758. of the 0.4.6.1-alpha changelog without this entry. Sorry for
  1759. the confusion!)
  1760. o Code simplification and refactoring (metrics, DoS):
  1761. - Move the DoS subsystem into the subsys manager, including its
  1762. configuration options. Closes ticket 40261.
  1763. o Documentation (manual):
  1764. - Move the ServerTransport* options to the "SERVER OPTIONS" section.
  1765. Closes issue 40331.
  1766. - Indicate that the HiddenServiceStatistics option also applies to
  1767. bridges. Closes ticket 40346.
  1768. - Move the description of BridgeRecordUsageByCountry to the section
  1769. "STATISTICS OPTIONS". Closes ticket 40323.
  1770. o Removed features (relay):
  1771. - Because DirPorts are only used on authorities, relays no longer
  1772. advertise them. Similarly, self-testing for DirPorts has been
  1773. disabled, since an unreachable DirPort is no reason for a relay
  1774. not to advertise itself. (Configuring a DirPort will still work,
  1775. for now.) Closes ticket 40282.
  1776. Changes in version 0.4.5.9 - 2021-06-14
  1777. Tor 0.4.5.9 fixes several security issues, including a
  1778. denial-of-service attack against onion service clients, and another
  1779. denial-of-service attack against relays. Everybody should upgrade to
  1780. one of 0.3.5.15, 0.4.4.9, 0.4.5.9, or 0.4.6.5.
  1781. o Major bugfixes (security, backport from 0.4.6.5):
  1782. - Don't allow relays to spoof RELAY_END or RELAY_RESOLVED cell on
  1783. half-closed streams. Previously, clients failed to validate which
  1784. hop sent these cells: this would allow a relay on a circuit to end
  1785. a stream that wasn't actually built with it. Fixes bug 40389;
  1786. bugfix on 0.3.5.1-alpha. This issue is also tracked as TROVE-2021-
  1787. 003 and CVE-2021-34548.
  1788. o Major bugfixes (security, defense-in-depth, backport from 0.4.6.5):
  1789. - Detect more failure conditions from the OpenSSL RNG code.
  1790. Previously, we would detect errors from a missing RNG
  1791. implementation, but not failures from the RNG code itself.
  1792. Fortunately, it appears those failures do not happen in practice
  1793. when Tor is using OpenSSL's default RNG implementation. Fixes bug
  1794. 40390; bugfix on 0.2.8.1-alpha. This issue is also tracked as
  1795. TROVE-2021-004. Reported by Jann Horn at Google's Project Zero.
  1796. o Major bugfixes (security, denial of service, backport from 0.4.6.5):
  1797. - Resist a hashtable-based CPU denial-of-service attack against
  1798. relays. Previously we used a naive unkeyed hash function to look
  1799. up circuits in a circuitmux object. An attacker could exploit this
  1800. to construct circuits with chosen circuit IDs, to create
  1801. collisions and make the hash table inefficient. Now we use a
  1802. SipHash construction here instead. Fixes bug 40391; bugfix on
  1803. 0.2.4.4-alpha. This issue is also tracked as TROVE-2021-005 and
  1804. CVE-2021-34549. Reported by Jann Horn from Google's Project Zero.
  1805. - Fix an out-of-bounds memory access in v3 onion service descriptor
  1806. parsing. An attacker could exploit this bug by crafting an onion
  1807. service descriptor that would crash any client that tried to visit
  1808. it. Fixes bug 40392; bugfix on 0.3.0.1-alpha. This issue is also
  1809. tracked as TROVE-2021-006 and CVE-2021-34550. Reported by Sergei
  1810. Glazunov from Google's Project Zero.
  1811. o Minor features (compatibility, backport from 0.4.6.4-rc):
  1812. - Remove an assertion function related to TLS renegotiation. It was
  1813. used nowhere outside the unit tests, and it was breaking
  1814. compilation with recent alpha releases of OpenSSL 3.0.0. Closes
  1815. ticket 40399.
  1816. o Minor features (geoip data):
  1817. - Update the geoip files to match the IPFire Location Database, as
  1818. retrieved on 2021/06/10.
  1819. o Minor bugfixes (control, sandbox, backport from 0.4.6.4-rc):
  1820. - Allow the control command SAVECONF to succeed when the seccomp
  1821. sandbox is enabled, and make SAVECONF keep only one backup file to
  1822. simplify implementation. Previously SAVECONF allowed a large
  1823. number of backup files, which made it incompatible with the
  1824. sandbox. Fixes bug 40317; bugfix on 0.2.5.4-alpha. Patch by
  1825. Daniel Pinto.
  1826. o Minor bugfixes (metrics port, backport from 0.4.6.4-rc):
  1827. - Fix a bug that made tor try to re-bind() on an already open
  1828. MetricsPort every 60 seconds. Fixes bug 40370; bugfix
  1829. on 0.4.5.1-alpha.
  1830. Changes in version 0.4.4.9 - 2021-06-14
  1831. Tor 0.4.4.9 fixes several security issues, including a
  1832. denial-of-service attack against onion service clients, and another
  1833. denial-of-service attack against relays. Everybody should upgrade to
  1834. one of 0.3.5.15, 0.4.4.9, 0.4.5.9, or 0.4.6.5.
  1835. Note that the scheduled end-of-life date for the Tor 0.4.4.x series is
  1836. June 15. This is therefore the last release in its series. Everybody
  1837. still running 0.4.4.x should plan to upgrade to 0.4.5.x or later.
  1838. o Major bugfixes (security, backport from 0.4.6.5):
  1839. - Don't allow relays to spoof RELAY_END or RELAY_RESOLVED cell on
  1840. half-closed streams. Previously, clients failed to validate which
  1841. hop sent these cells: this would allow a relay on a circuit to end
  1842. a stream that wasn't actually built with it. Fixes bug 40389;
  1843. bugfix on 0.3.5.1-alpha. This issue is also tracked as TROVE-2021-
  1844. 003 and CVE-2021-34548.
  1845. o Major bugfixes (security, defense-in-depth, backport from 0.4.6.5):
  1846. - Detect more failure conditions from the OpenSSL RNG code.
  1847. Previously, we would detect errors from a missing RNG
  1848. implementation, but not failures from the RNG code itself.
  1849. Fortunately, it appears those failures do not happen in practice
  1850. when Tor is using OpenSSL's default RNG implementation. Fixes bug
  1851. 40390; bugfix on 0.2.8.1-alpha. This issue is also tracked as
  1852. TROVE-2021-004. Reported by Jann Horn at Google's Project Zero.
  1853. o Major bugfixes (security, denial of service, backport from 0.4.6.5):
  1854. - Resist a hashtable-based CPU denial-of-service attack against
  1855. relays. Previously we used a naive unkeyed hash function to look
  1856. up circuits in a circuitmux object. An attacker could exploit this
  1857. to construct circuits with chosen circuit IDs, to create
  1858. collisions and make the hash table inefficient. Now we use a
  1859. SipHash construction here instead. Fixes bug 40391; bugfix on
  1860. 0.2.4.4-alpha. This issue is also tracked as TROVE-2021-005 and
  1861. CVE-2021-34549. Reported by Jann Horn from Google's Project Zero.
  1862. - Fix an out-of-bounds memory access in v3 onion service descriptor
  1863. parsing. An attacker could exploit this bug by crafting an onion
  1864. service descriptor that would crash any client that tried to visit
  1865. it. Fixes bug 40392; bugfix on 0.3.0.1-alpha. This issue is also
  1866. tracked as TROVE-2021-006 and CVE-2021-34550. Reported by Sergei
  1867. Glazunov from Google's Project Zero.
  1868. o Minor features (compatibility, backport from 0.4.6.4-rc):
  1869. - Remove an assertion function related to TLS renegotiation. It was
  1870. used nowhere outside the unit tests, and it was breaking
  1871. compilation with recent alpha releases of OpenSSL 3.0.0. Closes
  1872. ticket 40399.
  1873. o Minor features (fallback directory list, backport from 0.4.6.2-alpha):
  1874. - Regenerate the list of fallback directories to contain a new set
  1875. of 200 relays. Closes ticket 40265.
  1876. o Minor features (geoip data):
  1877. - Update the geoip files to match the IPFire Location Database, as
  1878. retrieved on 2021/06/10.
  1879. o Minor bugfixes (channel, DoS, backport from 0.4.6.2-alpha):
  1880. - Fix a non-fatal BUG() message due to a too-early free of a string,
  1881. when listing a client connection from the DoS defenses subsystem.
  1882. Fixes bug 40345; bugfix on 0.4.3.4-rc.
  1883. o Minor bugfixes (compiler warnings, backport from 0.4.6.3-rc):
  1884. - Fix an indentation problem that led to a warning from GCC 11.1.1.
  1885. Fixes bug 40380; bugfix on 0.3.0.1-alpha.
  1886. Changes in version 0.3.5.15 - 2021-06-14
  1887. Tor 0.3.5.15 fixes several security issues, including a
  1888. denial-of-service attack against onion service clients, and another
  1889. denial-of-service attack against relays. Everybody should upgrade to
  1890. one of 0.3.5.15, 0.4.4.9, 0.4.5.9, or 0.4.6.5.
  1891. o Major bugfixes (security, backport from 0.4.6.5):
  1892. - Don't allow relays to spoof RELAY_END or RELAY_RESOLVED cell on
  1893. half-closed streams. Previously, clients failed to validate which
  1894. hop sent these cells: this would allow a relay on a circuit to end
  1895. a stream that wasn't actually built with it. Fixes bug 40389;
  1896. bugfix on 0.3.5.1-alpha. This issue is also tracked as TROVE-2021-
  1897. 003 and CVE-2021-34548.
  1898. o Major bugfixes (security, defense-in-depth, backport from 0.4.6.5):
  1899. - Detect more failure conditions from the OpenSSL RNG code.
  1900. Previously, we would detect errors from a missing RNG
  1901. implementation, but not failures from the RNG code itself.
  1902. Fortunately, it appears those failures do not happen in practice
  1903. when Tor is using OpenSSL's default RNG implementation. Fixes bug
  1904. 40390; bugfix on 0.2.8.1-alpha. This issue is also tracked as
  1905. TROVE-2021-004. Reported by Jann Horn at Google's Project Zero.
  1906. o Major bugfixes (security, denial of service, backport from 0.4.6.5):
  1907. - Resist a hashtable-based CPU denial-of-service attack against
  1908. relays. Previously we used a naive unkeyed hash function to look
  1909. up circuits in a circuitmux object. An attacker could exploit this
  1910. to construct circuits with chosen circuit IDs, to create
  1911. collisions and make the hash table inefficient. Now we use a
  1912. SipHash construction here instead. Fixes bug 40391; bugfix on
  1913. 0.2.4.4-alpha. This issue is also tracked as TROVE-2021-005 and
  1914. CVE-2021-34549. Reported by Jann Horn from Google's Project Zero.
  1915. - Fix an out-of-bounds memory access in v3 onion service descriptor
  1916. parsing. An attacker could exploit this bug by crafting an onion
  1917. service descriptor that would crash any client that tried to visit
  1918. it. Fixes bug 40392; bugfix on 0.3.0.1-alpha. This issue is also
  1919. tracked as TROVE-2021-006 and CVE-2021-34550. Reported by Sergei
  1920. Glazunov from Google's Project Zero.
  1921. o Minor bugfixes (compiler warnings, backport from 0.4.6.3-rc):
  1922. - Fix an indentation problem that led to a warning from GCC 11.1.1.
  1923. Fixes bug 40380; bugfix on 0.3.0.1-alpha.
  1924. o Minor features (compatibility, backport from 0.4.6.4-rc):
  1925. - Remove an assertion function related to TLS renegotiation. It was
  1926. used nowhere outside the unit tests, and it was breaking
  1927. compilation with recent alpha releases of OpenSSL 3.0.0. Closes
  1928. ticket 40399.
  1929. o Minor features (fallback directory list, backport from 0.4.6.2-alpha):
  1930. - Regenerate the list of fallback directories to contain a new set
  1931. of 200 relays. Closes ticket 40265.
  1932. o Minor features (geoip data):
  1933. - Update the geoip files to match the IPFire Location Database, as
  1934. retrieved on 2021/06/10.
  1935. Changes in version 0.4.5.8 - 2021-05-10
  1936. Tor 0.4.5.8 fixes several bugs in earlier version, backporting fixes
  1937. from the 0.4.6.x series.
  1938. o Minor features (compatibility, Linux seccomp sandbox, backport from 0.4.6.3-rc):
  1939. - Add a workaround to enable the Linux sandbox to work correctly
  1940. with Glibc 2.33. This version of Glibc has started using the
  1941. fstatat() system call, which previously our sandbox did not allow.
  1942. Closes ticket 40382; see the ticket for a discussion of trade-offs.
  1943. o Minor features (compilation, backport from 0.4.6.3-rc):
  1944. - Make the autoconf script build correctly with autoconf versions
  1945. 2.70 and later. Closes part of ticket 40335.
  1946. o Minor features (fallback directory list, backport from 0.4.6.2-alpha):
  1947. - Regenerate the list of fallback directories to contain a new set
  1948. of 200 relays. Closes ticket 40265.
  1949. o Minor features (geoip data):
  1950. - Update the geoip files to match the IPFire Location Database, as
  1951. retrieved on 2021/05/07.
  1952. o Minor features (onion services):
  1953. - Add warning message when connecting to now deprecated v2 onion
  1954. services. As announced, Tor 0.4.5.x is the last series that will
  1955. support v2 onions. Closes ticket 40373.
  1956. o Minor bugfixes (bridge, pluggable transport, backport from 0.4.6.2-alpha):
  1957. - Fix a regression that made it impossible start Tor using a bridge
  1958. line with a transport name and no fingerprint. Fixes bug 40360;
  1959. bugfix on 0.4.5.4-rc.
  1960. o Minor bugfixes (build, cross-compilation, backport from 0.4.6.3-rc):
  1961. - Allow a custom "ar" for cross-compilation. Our previous build
  1962. script had used the $AR environment variable in most places, but
  1963. it missed one. Fixes bug 40369; bugfix on 0.4.5.1-alpha.
  1964. o Minor bugfixes (channel, DoS, backport from 0.4.6.2-alpha):
  1965. - Fix a non-fatal BUG() message due to a too-early free of a string,
  1966. when listing a client connection from the DoS defenses subsystem.
  1967. Fixes bug 40345; bugfix on 0.4.3.4-rc.
  1968. o Minor bugfixes (compiler warnings, backport from 0.4.6.3-rc):
  1969. - Fix an indentation problem that led to a warning from GCC 11.1.1.
  1970. Fixes bug 40380; bugfix on 0.3.0.1-alpha.
  1971. o Minor bugfixes (controller, backport from 0.4.6.1-alpha):
  1972. - Fix a "BUG" warning that would appear when a controller chooses
  1973. the first hop for a circuit, and that circuit completes. Fixes bug
  1974. 40285; bugfix on 0.3.2.1-alpha.
  1975. o Minor bugfixes (onion service, client, memory leak, backport from 0.4.6.3-rc):
  1976. - Fix a bug where an expired cached descriptor could get overwritten
  1977. with a new one without freeing it, leading to a memory leak. Fixes
  1978. bug 40356; bugfix on 0.3.5.1-alpha.
  1979. o Minor bugfixes (testing, BSD, backport from 0.4.6.2-alpha):
  1980. - Fix pattern-matching errors when patterns expand to invalid paths
  1981. on BSD systems. Fixes bug 40318; bugfix on 0.4.5.1-alpha. Patch by
  1982. Daniel Pinto.
  1983. Changes in version 0.3.5.14 - 2021-03-16
  1984. Tor 0.3.5.14 backports fixes for two important denial-of-service bugs
  1985. in earlier versions of Tor.
  1986. One of these vulnerabilities (TROVE-2021-001) would allow an attacker
  1987. who can send directory data to a Tor instance to force that Tor
  1988. instance to consume huge amounts of CPU. This is easiest to exploit
  1989. against authorities, since anybody can upload to them, but directory
  1990. caches could also exploit this vulnerability against relays or clients
  1991. when they download. The other vulnerability (TROVE-2021-002) only
  1992. affects directory authorities, and would allow an attacker to remotely
  1993. crash the authority with an assertion failure. Patches have already
  1994. been provided to the authority operators, to help ensure
  1995. network stability.
  1996. We recommend that everybody upgrade to one of the releases that fixes
  1997. these issues (0.3.5.14, 0.4.4.8, or 0.4.5.7) as they become available
  1998. to you.
  1999. This release also updates our GeoIP data source, and fixes a
  2000. compatibility issue.
  2001. o Major bugfixes (security, denial of service, backport from 0.4.5.7):
  2002. - Disable the dump_desc() function that we used to dump unparseable
  2003. information to disk. It was called incorrectly in several places,
  2004. in a way that could lead to excessive CPU usage. Fixes bug 40286;
  2005. bugfix on 0.2.2.1-alpha. This bug is also tracked as TROVE-2021-
  2006. 001 and CVE-2021-28089.
  2007. - Fix a bug in appending detached signatures to a pending consensus
  2008. document that could be used to crash a directory authority. Fixes
  2009. bug 40316; bugfix on 0.2.2.6-alpha. Tracked as TROVE-2021-002
  2010. and CVE-2021-28090.
  2011. o Minor features (geoip data, backport from 0.4.5.7):
  2012. - We have switched geoip data sources. Previously we shipped IP-to-
  2013. country mappings from Maxmind's GeoLite2, but in 2019 they changed
  2014. their licensing terms, so we were unable to update them after that
  2015. point. We now ship geoip files based on the IPFire Location
  2016. Database instead. (See https://location.ipfire.org/ for more
  2017. information). This release updates our geoip files to match the
  2018. IPFire Location Database as retrieved on 2021/03/12. Closes
  2019. ticket 40224.
  2020. o Removed features (mallinfo deprecated, backport from 0.4.5.7):
  2021. - Remove mallinfo() usage entirely. Libc 2.33+ now deprecates it.
  2022. Closes ticket 40309.
  2023. Changes in version 0.4.4.8 - 2021-03-16
  2024. Tor 0.4.4.8 backports fixes for two important denial-of-service bugs
  2025. in earlier versions of Tor.
  2026. One of these vulnerabilities (TROVE-2021-001) would allow an attacker
  2027. who can send directory data to a Tor instance to force that Tor
  2028. instance to consume huge amounts of CPU. This is easiest to exploit
  2029. against authorities, since anybody can upload to them, but directory
  2030. caches could also exploit this vulnerability against relays or clients
  2031. when they download. The other vulnerability (TROVE-2021-002) only
  2032. affects directory authorities, and would allow an attacker to remotely
  2033. crash the authority with an assertion failure. Patches have already
  2034. been provided to the authority operators, to help ensure
  2035. network stability.
  2036. We recommend that everybody upgrade to one of the releases that fixes
  2037. these issues (0.3.5.14, 0.4.4.8, or 0.4.5.7) as they become available
  2038. to you.
  2039. This release also updates our GeoIP data source, and fixes a
  2040. compatibility issue.
  2041. o Major bugfixes (security, denial of service, backport from 0.4.5.7):
  2042. - Disable the dump_desc() function that we used to dump unparseable
  2043. information to disk. It was called incorrectly in several places,
  2044. in a way that could lead to excessive CPU usage. Fixes bug 40286;
  2045. bugfix on 0.2.2.1-alpha. This bug is also tracked as TROVE-2021-
  2046. 001 and CVE-2021-28089.
  2047. - Fix a bug in appending detached signatures to a pending consensus
  2048. document that could be used to crash a directory authority. Fixes
  2049. bug 40316; bugfix on 0.2.2.6-alpha. Tracked as TROVE-2021-002
  2050. and CVE-2021-28090.
  2051. o Minor features (geoip data, backport from 0.4.5.7):
  2052. - We have switched geoip data sources. Previously we shipped IP-to-
  2053. country mappings from Maxmind's GeoLite2, but in 2019 they changed
  2054. their licensing terms, so we were unable to update them after that
  2055. point. We now ship geoip files based on the IPFire Location
  2056. Database instead. (See https://location.ipfire.org/ for more
  2057. information). This release updates our geoip files to match the
  2058. IPFire Location Database as retrieved on 2021/03/12. Closes
  2059. ticket 40224.
  2060. o Removed features (mallinfo deprecated, backport from 0.4.5.7):
  2061. - Remove mallinfo() usage entirely. Libc 2.33+ now deprecates it.
  2062. Closes ticket 40309.
  2063. Changes in version 0.4.5.7 - 2021-03-16
  2064. Tor 0.4.5.7 fixes two important denial-of-service bugs in earlier
  2065. versions of Tor.
  2066. One of these vulnerabilities (TROVE-2021-001) would allow an attacker
  2067. who can send directory data to a Tor instance to force that Tor
  2068. instance to consume huge amounts of CPU. This is easiest to exploit
  2069. against authorities, since anybody can upload to them, but directory
  2070. caches could also exploit this vulnerability against relays or clients
  2071. when they download. The other vulnerability (TROVE-2021-002) only
  2072. affects directory authorities, and would allow an attacker to remotely
  2073. crash the authority with an assertion failure. Patches have already
  2074. been provided to the authority operators, to help ensure
  2075. network stability.
  2076. We recommend that everybody upgrade to one of the releases that fixes
  2077. these issues (0.3.5.14, 0.4.4.8, or 0.4.5.7) as they become available
  2078. to you.
  2079. This release also updates our GeoIP data source, and fixes a few
  2080. smaller bugs in earlier releases.
  2081. o Major bugfixes (security, denial of service):
  2082. - Disable the dump_desc() function that we used to dump unparseable
  2083. information to disk. It was called incorrectly in several places,
  2084. in a way that could lead to excessive CPU usage. Fixes bug 40286;
  2085. bugfix on 0.2.2.1-alpha. This bug is also tracked as TROVE-2021-
  2086. 001 and CVE-2021-28089.
  2087. - Fix a bug in appending detached signatures to a pending consensus
  2088. document that could be used to crash a directory authority. Fixes
  2089. bug 40316; bugfix on 0.2.2.6-alpha. Tracked as TROVE-2021-002
  2090. and CVE-2021-28090.
  2091. o Minor features (geoip data):
  2092. - We have switched geoip data sources. Previously we shipped IP-to-
  2093. country mappings from Maxmind's GeoLite2, but in 2019 they changed
  2094. their licensing terms, so we were unable to update them after that
  2095. point. We now ship geoip files based on the IPFire Location
  2096. Database instead. (See https://location.ipfire.org/ for more
  2097. information). This release updates our geoip files to match the
  2098. IPFire Location Database as retrieved on 2021/03/12. Closes
  2099. ticket 40224.
  2100. o Minor bugfixes (directory authority):
  2101. - Now that exit relays don't allow exit connections to directory
  2102. authority DirPorts (to prevent network reentry), disable
  2103. authorities' reachability self test on the DirPort. Fixes bug
  2104. 40287; bugfix on 0.4.5.5-rc.
  2105. o Minor bugfixes (documentation):
  2106. - Fix a formatting error in the documentation for
  2107. VirtualAddrNetworkIPv6. Fixes bug 40256; bugfix on 0.2.9.4-alpha.
  2108. o Minor bugfixes (Linux, relay):
  2109. - Fix a bug in determining total available system memory that would
  2110. have been triggered if the format of Linux's /proc/meminfo file
  2111. had ever changed to include "MemTotal:" in the middle of a line.
  2112. Fixes bug 40315; bugfix on 0.2.5.4-alpha.
  2113. o Minor bugfixes (metrics port):
  2114. - Fix a BUG() warning on the MetricsPort for an internal missing
  2115. handler. Fixes bug 40295; bugfix on 0.4.5.1-alpha.
  2116. o Minor bugfixes (onion service):
  2117. - Remove a harmless BUG() warning when reloading tor configured with
  2118. onion services. Fixes bug 40334; bugfix on 0.4.5.1-alpha.
  2119. o Minor bugfixes (portability):
  2120. - Fix a non-portable usage of "==" with "test" in the configure
  2121. script. Fixes bug 40298; bugfix on 0.4.5.1-alpha.
  2122. o Minor bugfixes (relay):
  2123. - Remove a spammy log notice falsely claiming that the IPv4/v6
  2124. address was missing. Fixes bug 40300; bugfix on 0.4.5.1-alpha.
  2125. - Do not query the address cache early in the boot process when
  2126. deciding if a relay needs to fetch early directory information
  2127. from an authority. This bug resulted in a relay falsely believing
  2128. it didn't have an address and thus triggering an authority fetch
  2129. at each boot. Related to our fix for 40300.
  2130. o Removed features (mallinfo deprecated):
  2131. - Remove mallinfo() usage entirely. Libc 2.33+ now deprecates it.
  2132. Closes ticket 40309.
  2133. Changes in version 0.4.5.6 - 2021-02-15
  2134. The Tor 0.4.5.x release series is dedicated to the memory of Karsten
  2135. Loesing (1979-2020), Tor developer, cypherpunk, husband, and father.
  2136. Karsten is best known for creating the Tor metrics portal and leading
  2137. the metrics team, but he was involved in Tor from the early days. For
  2138. example, while he was still a student he invented and implemented the
  2139. v2 onion service directory design, and he also served as an ambassador
  2140. to the many German researchers working in the anonymity field. We
  2141. loved him and respected him for his patience, his consistency, and his
  2142. welcoming approach to growing our community.
  2143. This release series introduces significant improvements in relay IPv6
  2144. address discovery, a new "MetricsPort" mechanism for relay operators
  2145. to measure performance, LTTng support, build system improvements to
  2146. help when using Tor as a static library, and significant bugfixes
  2147. related to Windows relay performance. It also includes numerous
  2148. smaller features and bugfixes.
  2149. Below are the changes since 0.4.4.7. For a list of changes since
  2150. 0.4.5.5-rc, see the ChangeLog file.
  2151. o Major features (build):
  2152. - When building Tor, first link all object files into a single
  2153. static library. This may help with embedding Tor in other
  2154. programs. Note that most Tor functions do not constitute a part of
  2155. a stable or supported API: only those functions in tor_api.h
  2156. should be used if embedding Tor. Closes ticket 40127.
  2157. o Major features (metrics):
  2158. - Introduce a new MetricsPort which exposes, through an HTTP
  2159. interface, a series of metrics that tor collects at runtime. At
  2160. the moment, the only supported output format is Prometheus data
  2161. model. Closes ticket 40063. See the manual page for more
  2162. information and security considerations.
  2163. o Major features (relay, IPv6):
  2164. - The torrc option Address now supports IPv6. This unifies our
  2165. address discovery interface to support IPv4, IPv6, and hostnames.
  2166. Closes ticket 33233.
  2167. - Launch IPv4 and IPv6 ORPort self-test circuits on relays and
  2168. bridges. Closes ticket 33222.
  2169. - Relays now automatically bind on IPv6 for their ORPort, unless
  2170. specified otherwise with the IPv4Only flag. Closes ticket 33246.
  2171. - When a relay with IPv6 support is told to open a connection to
  2172. another relay, and the extend cell lists both IPv4 and IPv6
  2173. addresses, the first relay now picks randomly which address to
  2174. use. Closes ticket 33220.
  2175. - Relays now track their IPv6 ORPort reachability separately from
  2176. the reachability of their IPv4 ORPort. They will not publish a
  2177. descriptor unless _both_ ports appear to be externally reachable.
  2178. Closes ticket 34067.
  2179. o Major features (tracing):
  2180. - Add event-tracing library support for USDT and LTTng-UST, and a
  2181. few tracepoints in the circuit subsystem. More will come
  2182. incrementally. This feature is compiled out by default: it needs
  2183. to be enabled at configure time. See documentation in
  2184. doc/HACKING/Tracing.md. Closes ticket 32910.
  2185. o Major bugfixes (directory cache, performance, windows):
  2186. - Limit the number of items in the consensus diff cache to 64 on
  2187. Windows. We hope this will mitigate an issue where Windows relay
  2188. operators reported Tor using 100% CPU, while we investigate better
  2189. solutions. Fixes bug 24857; bugfix on 0.3.1.1-alpha.
  2190. o Major bugfixes (relay, windows):
  2191. - Fix a bug in our implementation of condition variables on Windows.
  2192. Previously, a relay on Windows would use 100% CPU after running
  2193. for some time. Because of this change, Tor now require Windows
  2194. Vista or later to build and run. Fixes bug 30187; bugfix on
  2195. 0.2.6.3-alpha. (This bug became more serious in 0.3.1.1-alpha with
  2196. the introduction of consensus diffs.) Patch by Daniel Pinto.
  2197. o Major bugfixes (TLS, buffer):
  2198. - When attempting to read N bytes on a TLS connection, really try to
  2199. read all N bytes. Previously, Tor would stop reading after the
  2200. first TLS record, which can be smaller than the N bytes requested,
  2201. and not check for more data until the next mainloop event. Fixes
  2202. bug 40006; bugfix on 0.1.0.5-rc.
  2203. o Minor features (address discovery):
  2204. - If no Address statements are found, relays now prioritize guessing
  2205. their address by looking at the local interface instead of the
  2206. local hostname. If the interface address can't be found, the local
  2207. hostname is used. Closes ticket 33238.
  2208. o Minor features (admin tools):
  2209. - Add a new --format argument to -key-expiration option to allow
  2210. specifying the time format of the expiration date. Adds Unix
  2211. timestamp format support. Patch by Daniel Pinto. Closes
  2212. ticket 30045.
  2213. o Minor features (authority, logging):
  2214. - Log more information for directory authority operators during the
  2215. consensus voting process, and while processing relay descriptors.
  2216. Closes ticket 40245.
  2217. o Minor features (bootstrap reporting):
  2218. - When reporting bootstrapping status on a relay, do not consider
  2219. connections that have never been the target of an origin circuit.
  2220. Previously, all connection failures were treated as potential
  2221. bootstrapping failures, including connections that had been opened
  2222. because of client requests. Closes ticket 25061.
  2223. o Minor features (build):
  2224. - When running the configure script, try to detect version
  2225. mismatches between the OpenSSL headers and libraries, and suggest
  2226. that the user should try "--with-openssl-dir". Closes 40138.
  2227. - If the configure script has given any warnings, remind the user
  2228. about them at the end of the script. Related to 40138.
  2229. o Minor features (configuration):
  2230. - Allow using wildcards (* and ?) with the %include option on
  2231. configuration files. Closes ticket 25140. Patch by Daniel Pinto.
  2232. - Allow the configuration options EntryNodes, ExcludeNodes,
  2233. ExcludeExitNodes, ExitNodes, MiddleNodes, HSLayer2Nodes and
  2234. HSLayer3Nodes to be specified multiple times. Closes ticket 28361.
  2235. Patch by Daniel Pinto.
  2236. o Minor features (control port):
  2237. - Add a DROPTIMEOUTS command to drop circuit build timeout history
  2238. and reset the current timeout. Closes ticket 40002.
  2239. - When a stream enters the AP_CONN_STATE_CONTROLLER_WAIT status,
  2240. send a control port event. Closes ticket 32190. Patch by
  2241. Neel Chauhan.
  2242. - Introduce GETINFO "stats/ntor/{assigned/requested}" and
  2243. "stats/tap/{assigned/requested}" to get the NTor and TAP circuit
  2244. onion handshake counts respectively. Closes ticket 28279. Patch by
  2245. Neel Chauhan.
  2246. o Minor features (control port, IPv6):
  2247. - Tor relays now try to report to the controller when they are
  2248. launching an IPv6 self-test. Closes ticket 34068.
  2249. - Introduce "GETINFO address/v4" and "GETINFO address/v6" in the
  2250. control port to fetch the Tor host's respective IPv4 or IPv6
  2251. address. We keep "GETINFO address" for backwards-compatibility.
  2252. Closes ticket 40039. Patch by Neel Chauhan.
  2253. o Minor features (directory authorities):
  2254. - Add a new consensus method 30 that removes the unnecessary "="
  2255. padding from ntor-onion-key. Closes ticket 7869. Patch by
  2256. Daniel Pinto.
  2257. - Directory authorities now reject descriptors from relays running
  2258. Tor versions from the obsolete 0.4.1 series. Resolves ticket
  2259. 34357. Patch by Neel Chauhan.
  2260. - The AssumeReachable option no longer stops directory authorities
  2261. from checking whether other relays are running. A new
  2262. AuthDirTestReachability option can be used to disable these
  2263. checks. Closes ticket 34445.
  2264. - When looking for possible Sybil attacks, also consider IPv6
  2265. addresses. Two routers are considered to have "the same" address
  2266. by this metric if they are in the same /64 network. Patch from
  2267. Maurice Pibouin. Closes ticket 7193.
  2268. o Minor features (directory authorities, IPv6):
  2269. - Make authorities add their IPv6 ORPort (if any) to the trusted
  2270. servers list. Authorities previously added only their IPv4
  2271. addresses. Closes ticket 32822.
  2272. o Minor features (documentation):
  2273. - Mention the "!badexit" directive that can appear in an authority's
  2274. approved-routers file, and update the description of the
  2275. "!invalid" directive. Closes ticket 40188.
  2276. o Minor features (ed25519, relay):
  2277. - Save a relay's base64-encoded ed25519 identity key to the data
  2278. directory in a file named fingerprint-ed25519. Closes ticket
  2279. 30642. Patch by Neel Chauhan.
  2280. o Minor features (heartbeat):
  2281. - Include the total number of inbound and outbound IPv4 and IPv6
  2282. connections in the heartbeat message. Closes ticket 29113.
  2283. o Minor features (IPv6, ExcludeNodes):
  2284. - Handle IPv6 addresses in ExcludeNodes; previously they were
  2285. ignored. Closes ticket 34065. Patch by Neel Chauhan.
  2286. o Minor features (logging):
  2287. - Add the running glibc version to the log, and the compiled glibc
  2288. version to the library list returned when using --library-versions.
  2289. Patch from Daniel Pinto. Closes ticket 40047.
  2290. - Consider an HTTP 301 response to be an error (like a 404) when
  2291. processing a directory response. Closes ticket 40053.
  2292. - Log directory fetch statistics as a single line. Closes
  2293. ticket 40159.
  2294. - Provide more complete descriptions of our connections when logging
  2295. about them. Closes ticket 40041.
  2296. - When describing a relay in the logs, we now include its ed25519
  2297. identity. Closes ticket 22668.
  2298. o Minor features (onion services):
  2299. - Only overwrite an onion service's existing hostname file if its
  2300. contents are wrong. This enables read-only onion-service
  2301. directories. Resolves ticket 40062. Patch by Neel Chauhan.
  2302. o Minor features (pluggable transports):
  2303. - Add an OutboundBindAddressPT option to allow users to specify
  2304. which IPv4 and IPv6 address pluggable transports should use for
  2305. outgoing IP packets. Tor does not have a way to enforce that the
  2306. pluggable transport honors this option, so each pluggable transport
  2307. needs to implement support on its own. Closes ticket 5304.
  2308. o Minor features (protocol, proxy support, defense in depth):
  2309. - Respond more deliberately to misbehaving proxies that leave
  2310. leftover data on their connections, so as to make Tor even less
  2311. likely to allow the proxies to pass their data off as having come
  2312. from a relay. Closes ticket 40017.
  2313. o Minor features (relay address tracking):
  2314. - We now store relay addresses for OR connections in a more logical
  2315. way. Previously we would sometimes overwrite the actual address of
  2316. a connection with a "canonical address", and then store the "real
  2317. address" elsewhere to remember it. We now track the "canonical
  2318. address" elsewhere for the cases where we need it, and leave the
  2319. connection's address alone. Closes ticket 33898.
  2320. o Minor features (relay):
  2321. - If a relay is unable to discover its address, attempt to learn it
  2322. from the NETINFO cell. Closes ticket 40022.
  2323. - Log immediately when launching a relay self-check. Previously we
  2324. would try to log before launching checks, or approximately when we
  2325. intended to launch checks, but this tended to be error-prone.
  2326. Closes ticket 34137.
  2327. o Minor features (relay, address discovery):
  2328. - If Address option is not found in torrc, attempt to learn our
  2329. address with the configured ORPort address if any. Closes
  2330. ticket 33236.
  2331. o Minor features (relay, IPv6):
  2332. - Add an AssumeReachableIPv6 option to disable self-checking IPv6
  2333. reachability. Closes part of ticket 33224.
  2334. - Add new "assume-reachable" and "assume-reachable-ipv6" consensus
  2335. parameters to be used in an emergency to tell relays that they
  2336. should publish even if they cannot complete their ORPort self-
  2337. checks. Closes ticket 34064 and part of 33224.
  2338. - Allow relays to send IPv6-only extend cells. Closes ticket 33222.
  2339. - Declare support for the Relay=3 subprotocol version. Closes
  2340. ticket 33226.
  2341. - When launching IPv6 ORPort self-test circuits, make sure that the
  2342. second-last hop can initiate an IPv6 extend. Closes ticket 33222.
  2343. o Minor features (safety):
  2344. - Log a warning at startup if Tor is built with compile-time options
  2345. that are likely to make it less stable or reliable. Closes
  2346. ticket 18888.
  2347. o Minor features (specification update):
  2348. - Several fields in microdescriptors, router descriptors, and
  2349. consensus documents that were formerly optional are now required.
  2350. Implements proposal 315; closes ticket 40132.
  2351. o Minor features (state management):
  2352. - When loading the state file, remove entries from the statefile
  2353. that have been obsolete for a long time. Ordinarily Tor preserves
  2354. unrecognized entries in order to keep forward-compatibility, but
  2355. these entries have not actually been used in any release since
  2356. before 0.3.5.x. Closes ticket 40137.
  2357. o Minor features (statistics, ipv6):
  2358. - Relays now publish IPv6-specific counts of single-direction versus
  2359. bidirectional relay connections. Closes ticket 33264.
  2360. - Relays now publish their IPv6 read and write statistics over time,
  2361. if statistics are enabled. Closes ticket 33263.
  2362. o Minor features (subprotocol versions):
  2363. - Use the new limitations on subprotocol versions due to proposal
  2364. 318 to simplify our implementation. Part of ticket 40133.
  2365. o Minor features (testing configuration):
  2366. - The TestingTorNetwork option no longer implicitly sets
  2367. AssumeReachable to 1. This change allows us to test relays' self-
  2368. testing mechanisms, and to test authorities' relay-testing
  2369. functionality. Closes ticket 34446.
  2370. o Minor features (testing):
  2371. - Added unit tests for channel_matches_target_addr_for_extend().
  2372. Closes Ticket 33919. Patch by MrSquanchee.
  2373. o Minor bugfixes (circuit padding):
  2374. - When circpad_send_padding_cell_for_callback is called,
  2375. `is_padding_timer_scheduled` flag was not reset. Now it is set to
  2376. 0 at the top of that function. Fixes bug 32671; bugfix
  2377. on 0.4.0.1-alpha.
  2378. - Add a per-circuit padding machine instance counter, so we can
  2379. differentiate between shutdown requests for old machines on a
  2380. circuit. Fixes bug 30992; bugfix on 0.4.1.1-alpha.
  2381. - Add the ability to keep circuit padding machines if they match a
  2382. set of circuit states or purposes. This allows us to have machines
  2383. that start up under some conditions but don't shut down under
  2384. others. We now use this mask to avoid starting up introduction
  2385. circuit padding again after the machines have already completed.
  2386. Fixes bug 32040; bugfix on 0.4.1.1-alpha.
  2387. o Minor bugfixes (circuit, handshake):
  2388. - In the v3 handshaking code, use connection_or_change_state() to
  2389. change the state. Previously, we changed the state directly, but
  2390. this did not pass the state change to the pubsub or channel
  2391. objects, potentially leading to bugs. Fixes bug 32880; bugfix on
  2392. 0.2.3.6-alpha. Patch by Neel Chauhan.
  2393. o Minor bugfixes (compilation):
  2394. - Change the linker flag ordering in our library search code so that
  2395. it works for compilers that need the libraries to be listed in the
  2396. right order. Fixes bug 33624; bugfix on 0.1.1.0-alpha.
  2397. - Fix the "--enable-static-tor" switch to properly set the "-static"
  2398. compile option onto the tor binary only. Fixes bug 40111; bugfix
  2399. on 0.2.3.1-alpha.
  2400. o Minor bugfixes (configuration):
  2401. - Exit Tor on a misconfiguration when the Bridge line is configured
  2402. to use a transport but no corresponding ClientTransportPlugin can
  2403. be found. Prior to this fix, Tor would attempt to connect to the
  2404. bridge directly without using the transport, making it easier for
  2405. adversaries to notice the bridge. Fixes bug 25528; bugfix
  2406. on 0.2.6.1-alpha.
  2407. o Minor bugfixes (control port):
  2408. - Make sure we send the SOCKS request address in relay begin cells
  2409. when a stream is attached with the purpose
  2410. CIRCUIT_PURPOSE_CONTROLLER. Fixes bug 33124; bugfix on 0.0.5.
  2411. Patch by Neel Chauhan.
  2412. o Minor bugfixes (crash, relay, signing key):
  2413. - Avoid assertion failures when we run Tor from the command line
  2414. with `--key-expiration sign`, but an ORPort is not set. Fixes bug
  2415. 40015; bugfix on 0.3.2.1-alpha. Patch by Neel Chauhan.
  2416. o Minor bugfixes (logging):
  2417. - Avoid a spurious log message about missing subprotocol versions,
  2418. when the consensus that we're reading from is older than the
  2419. current release. Previously we had made this message nonfatal, but
  2420. in practice, it is never relevant when the consensus is older than
  2421. the current release. Fixes bug 40281; bugfix on 0.4.0.1-alpha.
  2422. - Remove trailing whitespace from control event log messages. Fixes
  2423. bug 32178; bugfix on 0.1.1.1-alpha. Based on a patch by
  2424. Amadeusz Pawlik.
  2425. - Turn warning-level log message about SENDME failure into a debug-
  2426. level message. (This event can happen naturally, and is no reason
  2427. for concern). Fixes bug 40142; bugfix on 0.4.1.1-alpha.
  2428. - When logging a rate-limited message about how many messages have
  2429. been suppressed in the last N seconds, give an accurate value for
  2430. N, rounded up to the nearest minute. Previously we would report
  2431. the size of the rate-limiting interval, regardless of when the
  2432. messages started to occur. Fixes bug 19431; bugfix
  2433. on 0.2.2.16-alpha.
  2434. o Minor bugfixes (onion services):
  2435. - Avoid a non-fatal assertion in certain edge-cases when
  2436. establishing a circuit to an onion service. Fixes bug 32666;
  2437. bugfix on 0.3.0.3-alpha.
  2438. o Minor bugfixes (rust, protocol versions):
  2439. - Declare support for the onion service introduction point denial of
  2440. service extensions when building with Rust. Fixes bug 34248;
  2441. bugfix on 0.4.2.1-alpha.
  2442. - Make Rust protocol version support checks consistent with the
  2443. undocumented error behavior of the corresponding C code. Fixes bug
  2444. 34251; bugfix on 0.3.3.5-rc.
  2445. o Minor bugfixes (self-testing):
  2446. - When receiving an incoming circuit, only accept it as evidence
  2447. that we are reachable if the declared address of its channel is
  2448. the same address we think that we have. Otherwise, it could be
  2449. evidence that we're reachable on some other address. Fixes bug
  2450. 20165; bugfix on 0.1.0.1-rc.
  2451. o Minor bugfixes (spec conformance):
  2452. - Use the correct key type when generating signing->link
  2453. certificates. Fixes bug 40124; bugfix on 0.2.7.2-alpha.
  2454. o Minor bugfixes (subprotocol versions):
  2455. - Consistently reject extra commas, instead of only rejecting
  2456. leading commas. Fixes bug 27194; bugfix on 0.2.9.4-alpha.
  2457. - In summarize_protover_flags(), treat empty strings the same as
  2458. NULL. This prevents protocols_known from being set. Previously, we
  2459. treated empty strings as normal strings, which led to
  2460. protocols_known being set. Fixes bug 34232; bugfix on
  2461. 0.3.3.2-alpha. Patch by Neel Chauhan.
  2462. o Code simplification and refactoring:
  2463. - Add and use a set of functions to perform down-casts on constant
  2464. connection and channel pointers. Closes ticket 40046.
  2465. - Refactor our code that logs descriptions of connections, channels,
  2466. and the peers on them, to use a single call path. This change
  2467. enables us to refactor the data types that they use, and eliminates
  2468. many confusing usages of those types. Closes ticket 40041.
  2469. - Refactor some common node selection code into a single function.
  2470. Closes ticket 34200.
  2471. - Remove the now-redundant 'outbuf_flushlen' field from our
  2472. connection type. It was previously used for an older version of
  2473. our rate-limiting logic. Closes ticket 33097.
  2474. - Rename "fascist_firewall_*" identifiers to "reachable_addr_*"
  2475. instead, for consistency with other code. Closes ticket 18106.
  2476. - Rename functions about "advertised" ports which are not in fact
  2477. guaranteed to return the ports that have been advertised. Closes
  2478. ticket 40055.
  2479. - Split implementation of several command line options from
  2480. options_init_from_torrc into smaller isolated functions. Patch by
  2481. Daniel Pinto. Closes ticket 40102.
  2482. - When an extend cell is missing an IPv4 or IPv6 address, fill in
  2483. the address from the extend info. This is similar to what was done
  2484. in ticket 33633 for ed25519 keys. Closes ticket 33816. Patch by
  2485. Neel Chauhan.
  2486. o Deprecated features:
  2487. - The "non-builtin" argument to the "--dump-config" command is now
  2488. deprecated. When it works, it behaves the same as "short", which
  2489. you should use instead. Closes ticket 33398.
  2490. o Documentation:
  2491. - Replace URLs from our old bugtracker so that they refer to the new
  2492. bugtracker and wiki. Closes ticket 40101.
  2493. o Removed features:
  2494. - We no longer ship or build a "tor.service" file for use with
  2495. systemd. No distribution included this script unmodified, and we
  2496. don't have the expertise ourselves to maintain this in a way that
  2497. all the various systemd-based distributions can use. Closes
  2498. ticket 30797.
  2499. - We no longer ship support for the Android logging API. Modern
  2500. versions of Android can use the syslog API instead. Closes
  2501. ticket 32181.
  2502. - The "optimistic data" feature is now always on; there is no longer
  2503. an option to disable it from the torrc file or from the consensus
  2504. directory. Closes part of 40139.
  2505. - The "usecreatefast" network parameter is now removed; there is no
  2506. longer an option for authorities to turn it off. Closes part
  2507. of 40139.
  2508. o Testing:
  2509. - Add unit tests for bandwidth statistics manipulation functions.
  2510. Closes ticket 33812. Patch by MrSquanchee.
  2511. o Code simplification and refactoring (autoconf):
  2512. - Remove autoconf checks for unused funcs and headers. Closes ticket
  2513. 31699; Patch by @bduszel
  2514. o Code simplification and refactoring (maintainer scripts):
  2515. - Disable by default the pre-commit hook. Use the environment
  2516. variable TOR_EXTRA_PRE_COMMIT_CHECKS in order to run it.
  2517. Furthermore, stop running practracker in the pre-commit hook and
  2518. make check-local. Closes ticket 40019.
  2519. o Code simplification and refactoring (relay address):
  2520. - Most of IPv4 representation was using "uint32_t". It has now been
  2521. moved to use the internal "tor_addr_t" interface instead. This is
  2522. so we can properly integrate IPv6 along IPv4 with common
  2523. interfaces. Closes ticket 40043.
  2524. o Documentation (manual page):
  2525. - Move them from doc/ to doc/man/. Closes ticket 40044.
  2526. - Describe the status of the "Sandbox" option more accurately. It is
  2527. no longer "experimental", but it _is_ dependent on kernel and libc
  2528. versions. Closes ticket 23378.
  2529. o Documentation (tracing):
  2530. - Document in depth the circuit subsystem trace events in the new
  2531. doc/tracing/EventsCircuit.md. Closes ticket 40036.
  2532. o Removed features (controller):
  2533. - Remove the "GETINFO network-status" controller command. It has
  2534. been deprecated since 0.3.1.1-alpha. Closes ticket 22473.
  2535. Changes in version 0.4.4.7 - 2021-02-03
  2536. Tor 0.4.4.7 backports numerous bugfixes from later releases,
  2537. including one that made v3 onion services more susceptible to
  2538. denial-of-service attacks, and a feature that makes some kinds of
  2539. DoS attacks harder to perform.
  2540. o Major bugfixes (onion service v3, backport from 0.4.5.3-rc):
  2541. - Stop requiring a live consensus for v3 clients and services, and
  2542. allow a "reasonably live" consensus instead. This allows v3 onion
  2543. services to work even if the authorities fail to generate a
  2544. consensus for more than 2 hours in a row. Fixes bug 40237; bugfix
  2545. on 0.3.5.1-alpha.
  2546. o Major feature (exit, backport from 0.4.5.5-rc):
  2547. - Re-entry into the network is now denied at the Exit level to all
  2548. relays' ORPorts and authorities' ORPorts and DirPorts. This change
  2549. should help mitgate a set of denial-of-service attacks. Closes
  2550. ticket 2667.
  2551. o Minor feature (build system, backport from 0.4.5.4-rc):
  2552. - New "make lsp" command to generate the compile_commands.json file
  2553. used by the ccls language server. The "bear" program is needed for
  2554. this. Closes ticket 40227.
  2555. o Minor features (compilation, backport from 0.4.5.2-rc):
  2556. - Disable deprecation warnings when building with OpenSSL 3.0.0 or
  2557. later. There are a number of APIs newly deprecated in OpenSSL
  2558. 3.0.0 that Tor still requires. (A later version of Tor will try to
  2559. stop depending on these APIs.) Closes ticket 40165.
  2560. o Minor features (crypto, backport from 0.4.5.3-rc):
  2561. - Fix undefined behavior on our Keccak library. The bug only
  2562. appeared on platforms with 32-byte CPU cache lines (e.g. armv5tel)
  2563. and would result in wrong digests. Fixes bug 40210; bugfix on
  2564. 0.2.8.1-alpha. Thanks to Bernhard Übelacker, Arnd Bergmann and
  2565. weasel for diagnosing this.
  2566. o Minor bugfixes (compatibility, backport from 0.4.5.1-rc):
  2567. - Strip '\r' characters when reading text files on Unix platforms.
  2568. This should resolve an issue where a relay operator migrates a
  2569. relay from Windows to Unix, but does not change the line ending of
  2570. Tor's various state files to match the platform, and the CRLF line
  2571. endings from Windows end up leaking into other files such as the
  2572. extra-info document. Fixes bug 33781; bugfix on 0.0.9pre5.
  2573. o Minor bugfixes (compilation, backport from 0.4.5.3-rc):
  2574. - Fix a compilation warning about unreachable fallthrough
  2575. annotations when building with "--enable-all-bugs-are-fatal" on
  2576. some compilers. Fixes bug 40241; bugfix on 0.3.5.4-alpha.
  2577. o Minor bugfixes (SOCKS5, backport from 0.4.5.3-rc):
  2578. - Handle partial SOCKS5 messages correctly. Previously, our code
  2579. would send an incorrect error message if it got a SOCKS5 request
  2580. that wasn't complete. Fixes bug 40190; bugfix on 0.3.5.1-alpha.
  2581. o Minor bugfixes (testing, backport from 0.4.5.2-alpha):
  2582. - Fix the `config/parse_tcp_proxy_line` test so that it works
  2583. correctly on systems where the DNS provider hijacks invalid
  2584. queries. Fixes part of bug 40179; bugfix on 0.4.3.1-alpha.
  2585. - Fix our Python reference-implementation for the v3 onion service
  2586. handshake so that it works correctly with the version of hashlib
  2587. provided by Python 3.9. Fixes part of bug 40179; bugfix
  2588. on 0.3.1.6-rc.
  2589. - Fix the `tortls/openssl/log_one_error` test to work with OpenSSL
  2590. 3.0.0. Fixes bug 40170; bugfix on 0.2.8.1-alpha.
  2591. Changes in version 0.4.3.8 - 2021-02-03
  2592. Tor 0.4.3.8 backports numerous bugfixes from later releases,
  2593. including one that made v3 onion services more susceptible to
  2594. denial-of-service attacks, and a feature that makes some kinds of
  2595. DoS attacks harder to perform.
  2596. Note that this is, in all likelihood, the last release of Tor 0.4.3.x,
  2597. which will reach end-of-life on 15 Feb 2021.
  2598. o Major bugfixes (onion service v3, backport from 0.4.5.3-rc):
  2599. - Stop requiring a live consensus for v3 clients and services, and
  2600. allow a "reasonably live" consensus instead. This allows v3 onion
  2601. services to work even if the authorities fail to generate a
  2602. consensus for more than 2 hours in a row. Fixes bug 40237; bugfix
  2603. on 0.3.5.1-alpha.
  2604. o Major bugfixes (stats, onion services, backport from 0.4.4.5):
  2605. - Fix a bug where we were undercounting the Tor network's total
  2606. onion service traffic, by ignoring any traffic originating from
  2607. clients. Now we count traffic from both clients and services.
  2608. Fixes bug 40117; bugfix on 0.2.6.2-alpha.
  2609. o Major feature (exit, backport from 0.4.5.5-rc):
  2610. - Re-entry into the network is now denied at the Exit level to all
  2611. relays' ORPorts and authorities' ORPorts and DirPorts. This change
  2612. should help mitgate a set of denial-of-service attacks. Closes
  2613. ticket 2667.
  2614. o Minor feature (build system, backport from 0.4.5.4-rc):
  2615. - New "make lsp" command to generate the compile_commands.json file
  2616. used by the ccls language server. The "bear" program is needed for
  2617. this. Closes ticket 40227.
  2618. o Minor features (compilation, backport from 0.4.5.2-rc):
  2619. - Disable deprecation warnings when building with OpenSSL 3.0.0 or
  2620. later. There are a number of APIs newly deprecated in OpenSSL
  2621. 3.0.0 that Tor still requires. (A later version of Tor will try to
  2622. stop depending on these APIs.) Closes ticket 40165.
  2623. o Minor features (crypto, backport from 0.4.5.3-rc):
  2624. - Fix undefined behavior on our Keccak library. The bug only
  2625. appeared on platforms with 32-byte CPU cache lines (e.g. armv5tel)
  2626. and would result in wrong digests. Fixes bug 40210; bugfix on
  2627. 0.2.8.1-alpha. Thanks to Bernhard Übelacker, Arnd Bergmann and
  2628. weasel for diagnosing this.
  2629. o Minor bugfixes (compatibility, backport from 0.4.5.1-rc):
  2630. - Strip '\r' characters when reading text files on Unix platforms.
  2631. This should resolve an issue where a relay operator migrates a
  2632. relay from Windows to Unix, but does not change the line ending of
  2633. Tor's various state files to match the platform, and the CRLF line
  2634. endings from Windows end up leaking into other files such as the
  2635. extra-info document. Fixes bug 33781; bugfix on 0.0.9pre5.
  2636. o Minor bugfixes (compilation, backport from 0.4.5.1-rc):
  2637. - Resolve a compilation warning that could occur in
  2638. test_connection.c. Fixes bug 40113; bugfix on 0.2.9.3-alpha.
  2639. o Minor bugfixes (compilation, backport from 0.4.5.3-rc):
  2640. - Fix a compilation warning about unreachable fallthrough
  2641. annotations when building with "--enable-all-bugs-are-fatal" on
  2642. some compilers. Fixes bug 40241; bugfix on 0.3.5.4-alpha.
  2643. o Minor bugfixes (SOCKS5, backport from 0.4.5.3-rc):
  2644. - Handle partial SOCKS5 messages correctly. Previously, our code
  2645. would send an incorrect error message if it got a SOCKS5 request
  2646. that wasn't complete. Fixes bug 40190; bugfix on 0.3.5.1-alpha.
  2647. o Minor bugfixes (testing, backport from 0.4.5.2-alpha):
  2648. - Fix the `config/parse_tcp_proxy_line` test so that it works
  2649. correctly on systems where the DNS provider hijacks invalid
  2650. queries. Fixes part of bug 40179; bugfix on 0.4.3.1-alpha.
  2651. - Fix our Python reference-implementation for the v3 onion service
  2652. handshake so that it works correctly with the version of hashlib
  2653. provided by Python 3.9. Fixes part of bug 40179; bugfix
  2654. on 0.3.1.6-rc.
  2655. - Fix the `tortls/openssl/log_one_error` test to work with OpenSSL
  2656. 3.0.0. Fixes bug 40170; bugfix on 0.2.8.1-alpha.
  2657. Changes in version 0.3.5.13 - 2020-02-03
  2658. Tor 0.3.5.13 backports numerous bugfixes from later releases,
  2659. including one that made v3 onion services more susceptible to
  2660. denial-of-service attacks, and a feature that makes some kinds of
  2661. DoS attacks harder to perform.
  2662. o Major bugfixes (onion service v3, backport from 0.4.5.3-rc):
  2663. - Stop requiring a live consensus for v3 clients and services, and
  2664. allow a "reasonably live" consensus instead. This allows v3 onion
  2665. services to work even if the authorities fail to generate a
  2666. consensus for more than 2 hours in a row. Fixes bug 40237; bugfix
  2667. on 0.3.5.1-alpha.
  2668. o Major bugfixes (stats, onion services, backport from 0.4.4.5):
  2669. - Fix a bug where we were undercounting the Tor network's total
  2670. onion service traffic, by ignoring any traffic originating from
  2671. clients. Now we count traffic from both clients and services.
  2672. Fixes bug 40117; bugfix on 0.2.6.2-alpha.
  2673. o Major feature (exit, backport from 0.4.5.5-rc):
  2674. - Re-entry into the network is now denied at the Exit level to all
  2675. relays' ORPorts and authorities' ORPorts and DirPorts. This change
  2676. should help mitgate a set of denial-of-service attacks. Closes
  2677. ticket 2667.
  2678. o Minor feature (build system, backport from 0.4.5.4-rc):
  2679. - New "make lsp" command to generate the compile_commands.json file
  2680. used by the ccls language server. The "bear" program is needed for
  2681. this. Closes ticket 40227.
  2682. o Minor features (compilation, backport from 0.4.5.2-rc):
  2683. - Disable deprecation warnings when building with OpenSSL 3.0.0 or
  2684. later. There are a number of APIs newly deprecated in OpenSSL
  2685. 3.0.0 that Tor still requires. (A later version of Tor will try to
  2686. stop depending on these APIs.) Closes ticket 40165.
  2687. o Minor features (crypto, backport from 0.4.5.3-rc):
  2688. - Fix undefined behavior on our Keccak library. The bug only
  2689. appeared on platforms with 32-byte CPU cache lines (e.g. armv5tel)
  2690. and would result in wrong digests. Fixes bug 40210; bugfix on
  2691. 0.2.8.1-alpha. Thanks to Bernhard Übelacker, Arnd Bergmann and
  2692. weasel for diagnosing this.
  2693. o Minor bugfixes (compatibility, backport from 0.4.5.1-rc):
  2694. - Strip '\r' characters when reading text files on Unix platforms.
  2695. This should resolve an issue where a relay operator migrates a
  2696. relay from Windows to Unix, but does not change the line ending of
  2697. Tor's various state files to match the platform, and the CRLF line
  2698. endings from Windows end up leaking into other files such as the
  2699. extra-info document. Fixes bug 33781; bugfix on 0.0.9pre5.
  2700. o Minor bugfixes (compilation, backport from 0.4.5.1-rc):
  2701. - Resolve a compilation warning that could occur in
  2702. test_connection.c. Fixes bug 40113; bugfix on 0.2.9.3-alpha.
  2703. o Minor bugfixes (compilation, backport from 0.4.5.3-rc):
  2704. - Fix a compilation warning about unreachable fallthrough
  2705. annotations when building with "--enable-all-bugs-are-fatal" on
  2706. some compilers. Fixes bug 40241; bugfix on 0.3.5.4-alpha.
  2707. o Minor bugfixes (SOCKS5, backport from 0.4.5.3-rc):
  2708. - Handle partial SOCKS5 messages correctly. Previously, our code
  2709. would send an incorrect error message if it got a SOCKS5 request
  2710. that wasn't complete. Fixes bug 40190; bugfix on 0.3.5.1-alpha.
  2711. o Minor bugfixes (testing, backport from 0.4.5.2-alpha):
  2712. - Fix our Python reference-implementation for the v3 onion service
  2713. handshake so that it works correctly with the version of hashlib
  2714. provided by Python 3.9. Fixes part of bug 40179; bugfix
  2715. on 0.3.1.6-rc.
  2716. - Fix the `tortls/openssl/log_one_error` test to work with OpenSSL
  2717. 3.0.0. Fixes bug 40170; bugfix on 0.2.8.1-alpha.
  2718. Changes in version 0.4.4.6 - 2020-11-12
  2719. Tor 0.4.4.6 is the second stable release in the 0.4.4.x series. It
  2720. backports fixes from later releases, including a fix for TROVE-2020-
  2721. 005, a security issue that could be used, under certain cases, by an
  2722. adversary to observe traffic patterns on a limited number of circuits
  2723. intended for a different relay.
  2724. o Major bugfixes (security, backport from 0.4.5.1-alpha):
  2725. - When completing a channel, relays now check more thoroughly to
  2726. make sure that it matches any pending circuits before attaching
  2727. those circuits. Previously, address correctness and Ed25519
  2728. identities were not checked in this case, but only when extending
  2729. circuits on an existing channel. Fixes bug 40080; bugfix on
  2730. 0.2.7.2-alpha. Resolves TROVE-2020-005.
  2731. o Minor features (directory authorities, backport from 0.4.5.1-alpha):
  2732. - Authorities now list a different set of protocols as required and
  2733. recommended. These lists have been chosen so that only truly
  2734. recommended and/or required protocols are included, and so that
  2735. clients using 0.2.9 or later will continue to work (even though
  2736. they are not supported), whereas only relays running 0.3.5 or
  2737. later will meet the requirements. Closes ticket 40162.
  2738. - Make it possible to specify multiple ConsensusParams torrc lines.
  2739. Now directory authority operators can for example put the main
  2740. ConsensusParams config in one torrc file and then add to it from a
  2741. different torrc file. Closes ticket 40164.
  2742. o Minor features (subprotocol versions, backport from 0.4.5.1-alpha):
  2743. - Tor no longer allows subprotocol versions larger than 63.
  2744. Previously version numbers up to UINT32_MAX were allowed, which
  2745. significantly complicated our code. Implements proposal 318;
  2746. closes ticket 40133.
  2747. o Minor features (tests, v2 onion services, backport from 0.4.5.1-alpha):
  2748. - Fix a rendezvous cache unit test that was triggering an underflow
  2749. on the global rend cache allocation. Fixes bug 40125; bugfix
  2750. on 0.2.8.1-alpha.
  2751. - Fix another rendezvous cache unit test that was triggering an
  2752. underflow on the global rend cache allocation. Fixes bug 40126;
  2753. bugfix on 0.2.8.1-alpha.
  2754. o Minor bugfixes (compilation, backport from 0.4.5.1-alpha):
  2755. - Fix compiler warnings that would occur when building with
  2756. "--enable-all-bugs-are-fatal" and "--disable-module-relay" at the
  2757. same time. Fixes bug 40129; bugfix on 0.4.4.1-alpha.
  2758. - Resolve a compilation warning that could occur in
  2759. test_connection.c. Fixes bug 40113; bugfix on 0.2.9.3-alpha.
  2760. o Minor bugfixes (logging, backport from 0.4.5.1-alpha):
  2761. - Remove a debug logging statement that uselessly spammed the logs.
  2762. Fixes bug 40135; bugfix on 0.3.5.0-alpha.
  2763. o Minor bugfixes (relay configuration, crash, backport from 0.4.5.1-alpha):
  2764. - Avoid a fatal assert() when failing to create a listener
  2765. connection for an address that was in use. Fixes bug 40073; bugfix
  2766. on 0.3.5.1-alpha.
  2767. o Minor bugfixes (v2 onion services, backport from 0.4.5.1-alpha):
  2768. - For HSFETCH commands on v2 onion services addresses, check the
  2769. length of bytes decoded, not the base32 length. Fixes bug 34400;
  2770. bugfix on 0.4.1.1-alpha. Patch by Neel Chauhan.
  2771. Changes in version 0.4.3.7 - 2020-11-12
  2772. Tor 0.4.3.7 backports several bugfixes from later releases. It
  2773. includes a fix for TROVE-2020-005, a security issue that could be
  2774. used, under certain cases, by an adversary to observe traffic patterns
  2775. on a limited number of circuits intended for a different relay.
  2776. Please be aware that support for the 0.4.3.x series will end on 15
  2777. February 2021. Please upgrade to 0.4.4.x or 0.4.5.x before then, or
  2778. downgrade to 0.3.5.x, which will be supported until at least 1
  2779. February 2022.
  2780. o Major features (fallback directory list, backport form 0.4.4.3-alpha):
  2781. - Replace the 148 fallback directories originally included in Tor
  2782. 0.4.1.4-rc (of which around 105 are still functional) with a list
  2783. of 144 fallbacks generated in July 2020. Closes ticket 40061.
  2784. o Major bugfixes (security, backport from 0.4.5.1-alpha):
  2785. - When completing a channel, relays now check more thoroughly to
  2786. make sure that it matches any pending circuits before attaching
  2787. those circuits. Previously, address correctness and Ed25519
  2788. identities were not checked in this case, but only when extending
  2789. circuits on an existing channel. Fixes bug 40080; bugfix on
  2790. 0.2.7.2-alpha. Resolves TROVE-2020-005.
  2791. o Major bugfixes (NSS, backport from 0.4.4.3-alpha):
  2792. - When running with NSS enabled, make sure that NSS knows to expect
  2793. nonblocking sockets. Previously, we set our TCP sockets as
  2794. nonblocking, but did not tell NSS, which in turn could lead to
  2795. unexpected blocking behavior. Fixes bug 40035; bugfix
  2796. on 0.3.5.1-alpha.
  2797. o Minor features (security, backport from 0.4.4.4-rc):
  2798. - Channels using obsolete versions of the Tor link protocol are no
  2799. longer allowed to circumvent address-canonicity checks. (This is
  2800. only a minor issue, since such channels have no way to set ed25519
  2801. keys, and therefore should always be rejected for circuits that
  2802. specify ed25519 identities.) Closes ticket 40081.
  2803. o Minor features (subprotocol versions, backport from 0.4.5.1-alpha):
  2804. - Tor no longer allows subprotocol versions larger than 63.
  2805. Previously version numbers up to UINT32_MAX were allowed, which
  2806. significantly complicated our code. Implements proposal 318;
  2807. closes ticket 40133.
  2808. o Minor features (tests, backport from 0.4.4.5):
  2809. - Our "make check" target now runs the unit tests in 8 parallel
  2810. chunks. Doing this speeds up hardened CI builds by more than a
  2811. factor of two. Closes ticket 40098.
  2812. o Minor features (tests, v2 onion services, backport from 0.4.5.1-alpha):
  2813. - Fix a rendezvous cache unit test that was triggering an underflow
  2814. on the global rend cache allocation. Fixes bug 40125; bugfix
  2815. on 0.2.8.1-alpha.
  2816. - Fix another rendezvous cache unit test that was triggering an
  2817. underflow on the global rend cache allocation. Fixes bug 40126;
  2818. bugfix on 0.2.8.1-alpha.
  2819. o Minor bugfixes (correctness, buffers, backport from 0.4.4.4-rc):
  2820. - Fix a correctness bug that could cause an assertion failure if we
  2821. ever tried using the buf_move_all() function with an empty input
  2822. buffer. As far as we know, no released versions of Tor do this.
  2823. Fixes bug 40076; bugfix on 0.3.3.1-alpha.
  2824. o Minor bugfixes (logging, backport from 0.4.5.1-alpha):
  2825. - Remove a debug logging statement that uselessly spammed the logs.
  2826. Fixes bug 40135; bugfix on 0.3.5.0-alpha.
  2827. o Minor bugfixes (rate limiting, bridges, pluggable transports, backport from 0.4.4.4-rc):
  2828. - On a bridge, treat all connections from an ExtORPort as remote by
  2829. default for the purposes of rate-limiting. Previously, bridges
  2830. would treat the connection as local unless they explicitly
  2831. received a "USERADDR" command. ExtORPort connections still count
  2832. as local if there is a USERADDR command with an explicit local
  2833. address. Fixes bug 33747; bugfix on 0.2.5.1-alpha.
  2834. o Minor bugfixes (relay configuration, crash, backport from 0.4.5.1-alpha):
  2835. - Avoid a fatal assert() when failing to create a listener
  2836. connection for an address that was in use. Fixes bug 40073; bugfix
  2837. on 0.3.5.1-alpha.
  2838. o Minor bugfixes (relay, usability, backport from 0.4.4.3-alpha):
  2839. - Adjust the rules for when to warn about having too many
  2840. connections to other relays. Previously we'd tolerate up to 1.5
  2841. connections per relay on average. Now we tolerate more connections
  2842. for directory authorities, and raise the number of total
  2843. connections we need to see before we warn. Fixes bug 33880; bugfix
  2844. on 0.3.1.1-alpha.
  2845. o Minor bugfixes (tests, 0.4.4.5):
  2846. - Fix the behavior of the rend_cache/clean_v2_descs_as_dir when run
  2847. on its own. Previously, it would exit with an error. Fixes bug
  2848. 40099; bugfix on 0.2.8.1-alpha.
  2849. o Minor bugfixes (v2 onion services, backport from 0.4.5.1-alpha):
  2850. - For HSFETCH commands on v2 onion services addresses, check the
  2851. length of bytes decoded, not the base32 length. Fixes bug 34400;
  2852. bugfix on 0.4.1.1-alpha. Patch by Neel Chauhan.
  2853. o Minor bugfixes (windows, backport from 0.4.4.4-rc):
  2854. - Fix a bug that prevented Tor from starting if its log file grew
  2855. above 2GB. Fixes bug 31036; bugfix on 0.2.1.8-alpha.
  2856. o Deprecated features (onion service v2, backport form 0.4.4.2-alpha):
  2857. - Add a deprecation warning for version 2 onion services. Closes
  2858. ticket 40003.
  2859. o Removed features (backport from 0.4.4.3-alpha):
  2860. - Our "check-local" test target no longer tries to use the
  2861. Coccinelle semantic patching tool parse all the C files. While it
  2862. is a good idea to try to make sure Coccinelle works on our C
  2863. before we run a Coccinelle patch, doing so on every test run has
  2864. proven to be disruptive. You can still run this tool manually with
  2865. "make check-cocci". Closes ticket 40030. ticket 40030.
  2866. Changes in version 0.3.5.12 - 2020-11-12
  2867. Tor 0.4.3.7 backports several bugfixes from later releases. It
  2868. includes a fix for TROVE-2020-005, a security issue that could be
  2869. used, under certain cases, by an adversary to observe traffic patterns
  2870. on a limited number of circuits intended for a different relay.
  2871. o Major features (fallback directory list, backport form 0.4.4.3-alpha):
  2872. - Replace the 148 fallback directories originally included in Tor
  2873. 0.4.1.4-rc (of which around 105 are still functional) with a list
  2874. of 144 fallbacks generated in July 2020. Closes ticket 40061.
  2875. o Major bugfixes (security, backport from 0.4.5.1-alpha):
  2876. - When completing a channel, relays now check more thoroughly to
  2877. make sure that it matches any pending circuits before attaching
  2878. those circuits. Previously, address correctness and Ed25519
  2879. identities were not checked in this case, but only when extending
  2880. circuits on an existing channel. Fixes bug 40080; bugfix on
  2881. 0.2.7.2-alpha. Resolves TROVE-2020-005.
  2882. o Major bugfixes (NSS, backport from 0.4.4.3-alpha):
  2883. - When running with NSS enabled, make sure that NSS knows to expect
  2884. nonblocking sockets. Previously, we set our TCP sockets as
  2885. nonblocking, but did not tell NSS, which in turn could lead to
  2886. unexpected blocking behavior. Fixes bug 40035; bugfix
  2887. on 0.3.5.1-alpha.
  2888. o Minor features (security, backport from 0.4.4.4-rc):
  2889. - Channels using obsolete versions of the Tor link protocol are no
  2890. longer allowed to circumvent address-canonicity checks. (This is
  2891. only a minor issue, since such channels have no way to set ed25519
  2892. keys, and therefore should always be rejected for circuits that
  2893. specify ed25519 identities.) Closes ticket 40081.
  2894. o Minor features (debugging, directory system):
  2895. - Don't crash when we find a non-guard with a guard-fraction value
  2896. set. Instead, log a bug warning, in an attempt to figure out how
  2897. this happened. Diagnostic for ticket 32868.
  2898. o Minor features (subprotocol versions, backport from 0.4.5.1-alpha):
  2899. - Tor no longer allows subprotocol versions larger than 63.
  2900. Previously version numbers up to UINT32_MAX were allowed, which
  2901. significantly complicated our code. Implements proposal 318;
  2902. closes ticket 40133.
  2903. o Minor features (tests, backport from 0.4.4.5):
  2904. - Our "make check" target now runs the unit tests in 8 parallel
  2905. chunks. Doing this speeds up hardened CI builds by more than a
  2906. factor of two. Closes ticket 40098.
  2907. o Minor features (tests, v2 onion services, backport from 0.4.5.1-alpha):
  2908. - Fix a rendezvous cache unit test that was triggering an underflow
  2909. on the global rend cache allocation. Fixes bug 40125; bugfix
  2910. on 0.2.8.1-alpha.
  2911. - Fix another rendezvous cache unit test that was triggering an
  2912. underflow on the global rend cache allocation. Fixes bug 40126;
  2913. bugfix on 0.2.8.1-alpha.
  2914. o Minor bugfixes (correctness, buffers, backport from 0.4.4.4-rc):
  2915. - Fix a correctness bug that could cause an assertion failure if we
  2916. ever tried using the buf_move_all() function with an empty input
  2917. buffer. As far as we know, no released versions of Tor do this.
  2918. Fixes bug 40076; bugfix on 0.3.3.1-alpha.
  2919. o Minor bugfixes (logging, backport from 0.4.5.1-alpha):
  2920. - Remove a debug logging statement that uselessly spammed the logs.
  2921. Fixes bug 40135; bugfix on 0.3.5.0-alpha.
  2922. o Minor bugfixes (rate limiting, bridges, pluggable transports, backport from 0.4.4.4-rc):
  2923. - On a bridge, treat all connections from an ExtORPort as remote by
  2924. default for the purposes of rate-limiting. Previously, bridges
  2925. would treat the connection as local unless they explicitly
  2926. received a "USERADDR" command. ExtORPort connections still count
  2927. as local if there is a USERADDR command with an explicit local
  2928. address. Fixes bug 33747; bugfix on 0.2.5.1-alpha.
  2929. o Minor bugfixes (relay configuration, crash, backport from 0.4.5.1-alpha):
  2930. - Avoid a fatal assert() when failing to create a listener
  2931. connection for an address that was in use. Fixes bug 40073; bugfix
  2932. on 0.3.5.1-alpha.
  2933. o Minor bugfixes (relay, usability, backport from 0.4.4.3-alpha):
  2934. - Adjust the rules for when to warn about having too many
  2935. connections to other relays. Previously we'd tolerate up to 1.5
  2936. connections per relay on average. Now we tolerate more connections
  2937. for directory authorities, and raise the number of total
  2938. connections we need to see before we warn. Fixes bug 33880; bugfix
  2939. on 0.3.1.1-alpha.
  2940. o Minor bugfixes (relays, backport from 0.4.4.1-alpha):
  2941. - Stop advertising incorrect IPv6 ORPorts in relay and bridge
  2942. descriptors, when the IPv6 port was configured as "auto". Fixes
  2943. bug 32588; bugfix on 0.2.3.9-alpha.
  2944. o Minor bugfixes (tests, 0.4.4.5):
  2945. - Fix the behavior of the rend_cache/clean_v2_descs_as_dir when run
  2946. on its own. Previously, it would exit with an error. Fixes bug
  2947. 40099; bugfix on 0.2.8.1-alpha.
  2948. o Minor bugfixes (windows, backport from 0.4.4.4-rc):
  2949. - Fix a bug that prevented Tor from starting if its log file grew
  2950. above 2GB. Fixes bug 31036; bugfix on 0.2.1.8-alpha.
  2951. o Deprecated features (onion service v2, backport form 0.4.4.2-alpha):
  2952. - Add a deprecation warning for version 2 onion services. Closes
  2953. ticket 40003.
  2954. Changes in version 0.4.4.5 - 2020-09-15
  2955. Tor 0.4.4.5 is the first stable release in the 0.4.4.x series. This
  2956. series improves our guard selection algorithms, adds v3 onion balance
  2957. support, improves the amount of code that can be disabled when running
  2958. without relay support, and includes numerous small bugfixes and
  2959. enhancements. It also lays the ground for some IPv6 features that
  2960. we'll be developing more in the next (0.4.5) series.
  2961. Per our support policy, we support each stable release series for nine
  2962. months after its first stable release, or three months after the first
  2963. stable release of the next series: whichever is longer. This means
  2964. that 0.4.4.x will be supported until around June 2021--or later, if
  2965. 0.4.5.x is later than anticipated.
  2966. Note also that support for 0.4.2.x has just ended; support for 0.4.3
  2967. will continue until Feb 15, 2021. We still plan to continue supporting
  2968. 0.3.5.x, our long-term stable series, until Feb 2022.
  2969. Below are the changes since 0.4.3.6-rc. For a complete list of changes
  2970. since 0.4.4.4-rc, see the ChangeLog file.
  2971. o Major features (Proposal 310, performance + security):
  2972. - Implements Proposal 310, "Bandaid on guard selection". Proposal
  2973. 310 solves load-balancing issues with older versions of the guard
  2974. selection algorithm, and improves its security. Under this new
  2975. algorithm, a newly selected guard never becomes Primary unless all
  2976. previously sampled guards are unreachable. Implements
  2977. recommendation from 32088. (Proposal 310 is linked to the CLAPS
  2978. project researching optimal client location-aware path selections.
  2979. This project is a collaboration between the UCLouvain Crypto Group,
  2980. the U.S. Naval Research Laboratory, and Princeton University.)
  2981. o Major features (fallback directory list):
  2982. - Replace the 148 fallback directories originally included in Tor
  2983. 0.4.1.4-rc (of which around 105 are still functional) with a list
  2984. of 144 fallbacks generated in July 2020. Closes ticket 40061.
  2985. o Major features (IPv6, relay):
  2986. - Consider IPv6-only EXTEND2 cells valid on relays. Log a protocol
  2987. warning if the IPv4 or IPv6 address is an internal address, and
  2988. internal addresses are not allowed. But continue to use the other
  2989. address, if it is valid. Closes ticket 33817.
  2990. - If a relay can extend over IPv4 and IPv6, and both addresses are
  2991. provided, it chooses between them uniformly at random. Closes
  2992. ticket 33817.
  2993. - Re-use existing IPv6 connections for circuit extends. Closes
  2994. ticket 33817.
  2995. - Relays may extend circuits over IPv6, if the relay has an IPv6
  2996. ORPort, and the client supplies the other relay's IPv6 ORPort in
  2997. the EXTEND2 cell. IPv6 extends will be used by the relay IPv6
  2998. ORPort self-tests in 33222. Closes ticket 33817.
  2999. o Major features (v3 onion services):
  3000. - Allow v3 onion services to act as OnionBalance backend instances,
  3001. by using the HiddenServiceOnionBalanceInstance torrc option.
  3002. Closes ticket 32709.
  3003. o Major bugfixes (NSS):
  3004. - When running with NSS enabled, make sure that NSS knows to expect
  3005. nonblocking sockets. Previously, we set our TCP sockets as
  3006. nonblocking, but did not tell NSS, which in turn could lead to
  3007. unexpected blocking behavior. Fixes bug 40035; bugfix
  3008. on 0.3.5.1-alpha.
  3009. o Major bugfixes (onion services, DoS):
  3010. - Correct handling of parameters for the onion service DoS defense.
  3011. Previously, the consensus parameters for the onion service DoS
  3012. defenses were overwriting the parameters set by the service
  3013. operator using HiddenServiceEnableIntroDoSDefense. Fixes bug
  3014. 40109; bugfix on 0.4.2.1-alpha.
  3015. o Major bugfixes (stats, onion services):
  3016. - Fix a bug where we were undercounting the Tor network's total
  3017. onion service traffic, by ignoring any traffic originating from
  3018. clients. Now we count traffic from both clients and services.
  3019. Fixes bug 40117; bugfix on 0.2.6.2-alpha.
  3020. o Minor features (security):
  3021. - Channels using obsolete versions of the Tor link protocol are no
  3022. longer allowed to circumvent address-canonicity checks. (This is
  3023. only a minor issue, since such channels have no way to set ed25519
  3024. keys, and therefore should always be rejected for circuits that
  3025. specify ed25519 identities.) Closes ticket 40081.
  3026. o Minor features (bootstrap reporting):
  3027. - Report more detailed reasons for bootstrap failure when the
  3028. failure happens due to a TLS error. Previously we would just call
  3029. these errors "MISC" when they happened during read, and "DONE"
  3030. when they happened during any other TLS operation. Closes
  3031. ticket 32622.
  3032. o Minor features (client-only compilation):
  3033. - Disable more code related to the ext_orport protocol when
  3034. compiling without support for relay mode. Closes ticket 33368.
  3035. - Disable more of our self-testing code when support for relay mode
  3036. is disabled. Closes ticket 33370.
  3037. - Most server-side DNS code is now disabled when building without
  3038. support for relay mode. Closes ticket 33366.
  3039. o Minor features (code safety):
  3040. - Check for failures of tor_inet_ntop() and tor_inet_ntoa()
  3041. functions in DNS and IP address processing code, and adjust
  3042. codepaths to make them less likely to crash entire Tor instances.
  3043. Resolves issue 33788.
  3044. o Minor features (continuous integration):
  3045. - Run unit-test and integration test (Stem, Chutney) jobs with
  3046. ALL_BUGS_ARE_FATAL macro being enabled on Travis and Appveyor.
  3047. Resolves ticket 32143.
  3048. o Minor features (control port):
  3049. - If a ClientName was specified in ONION_CLIENT_AUTH_ADD for an
  3050. onion service, display it when we use ONION_CLIENT_AUTH_VIEW.
  3051. Closes ticket 40089. Patch by Neel Chauhan.
  3052. - Return a descriptive error message from the 'GETINFO status/fresh-
  3053. relay-descs' command on the control port. Previously, we returned
  3054. a generic error of "Error generating descriptor". Closes ticket
  3055. 32873. Patch by Neel Chauhan.
  3056. o Minor features (defense in depth):
  3057. - Wipe more data from connection address fields before returning
  3058. them to the memory heap. Closes ticket 6198.
  3059. o Minor features (denial-of-service memory limiter):
  3060. - Allow the user to configure even lower values for the
  3061. MaxMemInQueues parameter. Relays now enforce a minimum of 64 MB,
  3062. when previously the minimum was 256 MB. On clients, there is no
  3063. minimum. Relays and clients will both warn if the value is set so
  3064. low that Tor is likely to stop working. Closes ticket 24308.
  3065. o Minor features (developer tooling):
  3066. - Add a script to help check the alphabetical ordering of option
  3067. names in the manual page. Closes ticket 33339.
  3068. - Refrain from listing all .a files that are generated by the Tor
  3069. build in .gitignore. Add a single wildcard *.a entry that covers
  3070. all of them for present and future. Closes ticket 33642.
  3071. - Add a script ("git-install-tools.sh") to install git hooks and
  3072. helper scripts. Closes ticket 33451.
  3073. o Minor features (directory authority):
  3074. - Authorities now recommend the protocol versions that are supported
  3075. by Tor 0.3.5 and later. (Earlier versions of Tor have been
  3076. deprecated since January of this year.) This recommendation will
  3077. cause older clients and relays to give a warning on startup, or
  3078. when they download a consensus directory. Closes ticket 32696.
  3079. o Minor features (directory authority, shared random):
  3080. - Refactor more authority-only parts of the shared-random scheduling
  3081. code to reside in the dirauth module, and to be disabled when
  3082. compiling with --disable-module-dirauth. Closes ticket 33436.
  3083. o Minor features (directory):
  3084. - Remember the number of bytes we have downloaded for each directory
  3085. purpose while bootstrapping, and while fully bootstrapped. Log
  3086. this information as part of the heartbeat message. Closes
  3087. ticket 32720.
  3088. o Minor features (entry guards):
  3089. - Reinstate support for GUARD NEW/UP/DOWN control port events.
  3090. Closes ticket 40001.
  3091. o Minor features (IPv6 support):
  3092. - Adds IPv6 support to tor_addr_is_valid(). Adds tests for the above
  3093. changes and tor_addr_is_null(). Closes ticket 33679. Patch
  3094. by MrSquanchee.
  3095. - Allow clients and relays to send dual-stack and IPv6-only EXTEND2
  3096. cells. Parse dual-stack and IPv6-only EXTEND2 cells on relays.
  3097. Closes ticket 33901.
  3098. o Minor features (linux seccomp2 sandbox, portability):
  3099. - Allow Tor to build on platforms where it doesn't know how to
  3100. report which syscall caused the linux seccomp2 sandbox to fail.
  3101. This change should make the sandbox code more portable to less
  3102. common Linux architectures. Closes ticket 34382.
  3103. - Permit the unlinkat() syscall, which some Libc implementations use
  3104. to implement unlink(). Closes ticket 33346.
  3105. o Minor features (logging):
  3106. - When trying to find our own address, add debug-level logging to
  3107. report the sources of candidate addresses. Closes ticket 32888.
  3108. o Minor features (onion service client, SOCKS5):
  3109. - Add 3 new SocksPort ExtendedErrors (F2, F3, F7) that reports back
  3110. new type of onion service connection failures. The semantics of
  3111. these error codes are documented in proposal 309. Closes
  3112. ticket 32542.
  3113. o Minor features (onion service v3):
  3114. - If a service cannot upload its descriptor(s), log why at INFO
  3115. level. Closes ticket 33400; bugfix on 0.3.2.1-alpha.
  3116. o Minor features (python scripts):
  3117. - Stop assuming that /usr/bin/python exists. Instead of using a
  3118. hardcoded path in scripts that still use Python 2, use
  3119. /usr/bin/env, similarly to the scripts that use Python 3. Fixes
  3120. bug 33192; bugfix on 0.4.2.
  3121. o Minor features (testing, architecture):
  3122. - Our test scripts now double-check that subsystem initialization
  3123. order is consistent with the inter-module dependencies established
  3124. by our .may_include files. Implements ticket 31634.
  3125. - Initialize all subsystems at the beginning of our unit test
  3126. harness, to avoid crashes due to uninitialized subsystems. Follow-
  3127. up from ticket 33316.
  3128. - Our "make check" target now runs the unit tests in 8 parallel
  3129. chunks. Doing this speeds up hardened CI builds by more than a
  3130. factor of two. Closes ticket 40098.
  3131. o Minor features (v3 onion services):
  3132. - Add v3 onion service status to the dumpstats() call which is
  3133. triggered by a SIGUSR1 signal. Previously, we only did v2 onion
  3134. services. Closes ticket 24844. Patch by Neel Chauhan.
  3135. o Minor features (windows):
  3136. - Add support for console control signals like Ctrl+C in Windows.
  3137. Closes ticket 34211. Patch from Damon Harris (TheDcoder).
  3138. o Minor bugfixes (control port, onion service):
  3139. - Consistently use 'address' in "Invalid v3 address" response to
  3140. ONION_CLIENT_AUTH commands. Previously, we would sometimes say
  3141. 'addr'. Fixes bug 40005; bugfix on 0.4.3.1-alpha.
  3142. o Minor bugfixes (correctness, buffers):
  3143. - Fix a correctness bug that could cause an assertion failure if we
  3144. ever tried using the buf_move_all() function with an empty input
  3145. buffer. As far as we know, no released versions of Tor do this.
  3146. Fixes bug 40076; bugfix on 0.3.3.1-alpha.
  3147. o Minor bugfixes (directory authorities):
  3148. - Directory authorities now reject votes that arrive too late. In
  3149. particular, once an authority has started fetching missing votes,
  3150. it no longer accepts new votes posted by other authorities. This
  3151. change helps prevent a consensus split, where only some authorities
  3152. have the late vote. Fixes bug 4631; bugfix on 0.2.0.5-alpha.
  3153. o Minor bugfixes (git scripts):
  3154. - Stop executing the checked-out pre-commit hook from the pre-push
  3155. hook. Instead, execute the copy in the user's git directory. Fixes
  3156. bug 33284; bugfix on 0.4.1.1-alpha.
  3157. o Minor bugfixes (initialization):
  3158. - Initialize the subsystems in our code in an order more closely
  3159. corresponding to their dependencies, so that every system is
  3160. initialized before the ones that (theoretically) depend on it.
  3161. Fixes bug 33316; bugfix on 0.4.0.1-alpha.
  3162. o Minor bugfixes (IPv4, relay):
  3163. - Check for invalid zero IPv4 addresses and ports when sending and
  3164. receiving extend cells. Fixes bug 33900; bugfix on 0.2.4.8-alpha.
  3165. o Minor bugfixes (IPv6, relay):
  3166. - Consider IPv6 addresses when checking if a connection is
  3167. canonical. In 17604, relays assumed that a remote relay could
  3168. consider an IPv6 connection canonical, but did not set the
  3169. canonical flag on their side of the connection. Fixes bug 33899;
  3170. bugfix on 0.3.1.1-alpha.
  3171. - Log IPv6 addresses on connections where this relay is the
  3172. responder. Previously, responding relays would replace the remote
  3173. IPv6 address with the IPv4 address from the consensus. Fixes bug
  3174. 33899; bugfix on 0.3.1.1-alpha.
  3175. o Minor bugfixes (linux seccomp2 sandbox):
  3176. - Fix a regression on sandboxing rules for the openat() syscall. The
  3177. fix for bug 25440 fixed the problem on systems with glibc >= 2.27
  3178. but broke with versions of glibc. We now choose a rule based on
  3179. the glibc version. Patch from Daniel Pinto. Fixes bug 27315;
  3180. bugfix on 0.3.5.11.
  3181. - Makes the seccomp sandbox allow the correct syscall for opendir
  3182. according to the running glibc version. This fixes crashes when
  3183. reloading torrc with sandbox enabled when running on glibc 2.15 to
  3184. 2.21 and 2.26. Patch from Daniel Pinto. Fixes bug 40020; bugfix
  3185. on 0.3.5.11.
  3186. o Minor bugfixes (logging, testing):
  3187. - Make all of tor's assertion macros support the ALL_BUGS_ARE_FATAL
  3188. and DISABLE_ASSERTS_IN_UNIT_TESTS debugging modes. (IF_BUG_ONCE()
  3189. used to log a non-fatal warning, regardless of the debugging
  3190. mode.) Fixes bug 33917; bugfix on 0.2.9.1-alpha.
  3191. - Remove surprising empty line in the INFO-level log about circuit
  3192. build timeout. Fixes bug 33531; bugfix on 0.3.3.1-alpha.
  3193. o Minor bugfixes (mainloop):
  3194. - Better guard against growing a buffer past its maximum 2GB in
  3195. size. Fixes bug 33131; bugfix on 0.3.0.4-rc.
  3196. o Minor bugfixes (onion service v3 client):
  3197. - Remove a BUG() warning that could occur naturally. Fixes bug
  3198. 34087; bugfix on 0.3.2.1-alpha.
  3199. o Minor bugfixes (onion service, logging):
  3200. - Fix a typo in a log message PublishHidServDescriptors is set to 0.
  3201. Fixes bug 33779; bugfix on 0.3.2.1-alpha.
  3202. o Minor bugfixes (onion services v3):
  3203. - Avoid a non-fatal assertion failure in certain edge-cases when
  3204. opening an intro circuit as a client. Fixes bug 34084; bugfix
  3205. on 0.3.2.1-alpha.
  3206. o Minor bugfixes (protocol versions):
  3207. - Sort tor's supported protocol version lists, as recommended by the
  3208. tor directory specification. Fixes bug 33285; bugfix
  3209. on 0.4.0.1-alpha.
  3210. o Minor bugfixes (rate limiting, bridges, pluggable transports):
  3211. - On a bridge, treat all connections from an ExtORPort as remote by
  3212. default for the purposes of rate-limiting. Previously, bridges
  3213. would treat the connection as local unless they explicitly
  3214. received a "USERADDR" command. ExtORPort connections still count
  3215. as local if there is a USERADDR command with an explicit local
  3216. address. Fixes bug 33747; bugfix on 0.2.5.1-alpha.
  3217. o Minor bugfixes (refactoring):
  3218. - Lift circuit_build_times_disabled() out of the
  3219. circuit_expire_building() loop, to save CPU time when there are
  3220. many circuits open. Fixes bug 33977; bugfix on 0.3.5.9.
  3221. o Minor bugfixes (relay, self-testing):
  3222. - When starting up as a relay, if we haven't been able to verify
  3223. that we're reachable, only launch reachability tests at most once
  3224. a minute. Previously, we had been launching tests up to once a
  3225. second, which was needlessly noisy. Fixes bug 40083; bugfix
  3226. on 0.2.8.1-alpha.
  3227. o Minor bugfixes (relay, usability):
  3228. - Adjust the rules for when to warn about having too many
  3229. connections to other relays. Previously we'd tolerate up to 1.5
  3230. connections per relay on average. Now we tolerate more connections
  3231. for directory authorities, and raise the number of total
  3232. connections we need to see before we warn. Fixes bug 33880; bugfix
  3233. on 0.3.1.1-alpha.
  3234. o Minor bugfixes (SOCKS, onion service client):
  3235. - Detect v3 onion service addresses of the wrong length when
  3236. returning the F6 ExtendedErrors code. Fixes bug 33873; bugfix
  3237. on 0.4.3.1-alpha.
  3238. o Minor bugfixes (tests):
  3239. - Fix the behavior of the rend_cache/clean_v2_descs_as_dir when run
  3240. on its own. Previously, it would exit with an error. Fixes bug
  3241. 40099; bugfix on 0.2.8.1-alpha.
  3242. o Minor bugfixes (v3 onion services):
  3243. - Remove a BUG() warning that could trigger in certain unlikely
  3244. edge-cases. Fixes bug 34086; bugfix on 0.3.2.1-alpha.
  3245. - Remove a BUG() that was causing a stacktrace when a descriptor
  3246. changed at an unexpected time. Fixes bug 28992; bugfix
  3247. on 0.3.2.1-alpha.
  3248. o Minor bugfixes (windows):
  3249. - Fix a bug that prevented Tor from starting if its log file grew
  3250. above 2GB. Fixes bug 31036; bugfix on 0.2.1.8-alpha.
  3251. o Code simplification and refactoring:
  3252. - Define and use a new constant TOR_ADDRPORT_BUF_LEN which is like
  3253. TOR_ADDR_BUF_LEN but includes enough space for an IP address,
  3254. brackets, separating colon, and port number. Closes ticket 33956.
  3255. Patch by Neel Chauhan.
  3256. - Merge the orconn and ocirc events into the "core" subsystem, which
  3257. manages or connections and origin circuits. Previously they were
  3258. isolated in subsystems of their own.
  3259. - Move LOG_PROTOCOL_WARN to app/config. Resolves a dependency
  3260. inversion. Closes ticket 33633.
  3261. - Move the circuit extend code to the relay module. Split the
  3262. circuit extend function into smaller functions. Closes
  3263. ticket 33633.
  3264. - Rewrite port_parse_config() to use the default port flags from
  3265. port_cfg_new(). Closes ticket 32994. Patch by MrSquanchee.
  3266. - Updated comments in 'scheduler.c' to reflect old code changes, and
  3267. simplified the scheduler channel state change code. Closes
  3268. ticket 33349.
  3269. - Refactor configuration parsing to use the new config subsystem
  3270. code. Closes ticket 33014.
  3271. - Move a series of functions related to address resolving into their
  3272. own files. Closes ticket 33789.
  3273. o Documentation:
  3274. - Replace most http:// URLs in our code and documentation with
  3275. https:// URLs. (We have left unchanged the code in src/ext/, and
  3276. the text in LICENSE.) Closes ticket 31812. Patch from Jeremy Rand.
  3277. - Document the limitations of using %include on config files with
  3278. seccomp sandbox enabled. Fixes documentation bug 34133; bugfix on
  3279. 0.3.1.1-alpha. Patch by Daniel Pinto.
  3280. o Removed features:
  3281. - Our "check-local" test target no longer tries to use the
  3282. Coccinelle semantic patching tool parse all the C files. While it
  3283. is a good idea to try to make sure Coccinelle works on our C
  3284. before we run a Coccinelle patch, doing so on every test run has
  3285. proven to be disruptive. You can still run this tool manually with
  3286. "make check-cocci". Closes ticket 40030.
  3287. - Remove the ClientAutoIPv6ORPort option. This option attempted to
  3288. randomly choose between IPv4 and IPv6 for client connections, and
  3289. wasn't a true implementation of Happy Eyeballs. Often, this option
  3290. failed on IPv4-only or IPv6-only connections. Closes ticket 32905.
  3291. Patch by Neel Chauhan.
  3292. - Stop shipping contrib/dist/rc.subr file, as it is not being used
  3293. on FreeBSD anymore. Closes issue 31576.
  3294. o Testing:
  3295. - Add a basic IPv6 test to "make test-network". This test only runs
  3296. when the local machine has an IPv6 stack. Closes ticket 33300.
  3297. - Add test-network-ipv4 and test-network-ipv6 jobs to the Makefile.
  3298. These jobs run the IPv4-only and dual-stack chutney flavours from
  3299. test-network-all. Closes ticket 33280.
  3300. - Remove a redundant distcheck job. Closes ticket 33194.
  3301. - Run the test-network-ipv6 Makefile target in the Travis CI IPv6
  3302. chutney job. This job runs on macOS, so it's a bit slow. Closes
  3303. ticket 33303.
  3304. - Sort the Travis jobs in order of speed. Putting the slowest jobs
  3305. first takes full advantage of Travis job concurrency. Closes
  3306. ticket 33194.
  3307. - Stop allowing the Chutney IPv6 Travis job to fail. This job was
  3308. previously configured to fast_finish (which requires
  3309. allow_failure), to speed up the build. Closes ticket 33195.
  3310. - Test v3 onion services to tor's mixed IPv4 chutney network. And
  3311. add a mixed IPv6 chutney network. These networks are used in the
  3312. test-network-all, test-network-ipv4, and test-network-ipv6 make
  3313. targets. Closes ticket 33334.
  3314. - Use the "bridges+hs-v23" chutney network flavour in "make test-
  3315. network". This test requires a recent version of chutney (mid-
  3316. February 2020). Closes ticket 28208.
  3317. - When a Travis chutney job fails, use chutney's new "diagnostics.sh"
  3318. tool to produce detailed diagnostic output. Closes ticket 32792.
  3319. o Deprecated features (onion service v2):
  3320. - Add a deprecation warning for version 2 onion services. Closes
  3321. ticket 40003.
  3322. o Documentation (manual page):
  3323. - Add cross reference links and a table of contents to the HTML tor
  3324. manual page. Closes ticket 33369. Work by Swati Thacker as part of
  3325. Google Season of Docs.
  3326. - Alphabetize the Denial of Service Mitigation Options, Directory
  3327. Authority Server Options, Hidden Service Options, and Testing
  3328. Network Options sections of the tor(1) manual page. Closes ticket
  3329. 33275. Work by Swati Thacker as part of Google Season of Docs.
  3330. - Refrain from mentioning nicknames in manpage section for MyFamily
  3331. torrc option. Resolves issue 33417.
  3332. - Updated the options set by TestingTorNetwork in the manual page.
  3333. Closes ticket 33778.
  3334. Changes in version 0.3.5.11 - 2020-07-09
  3335. Tor 0.3.5.11 backports fixes from later tor releases, including several
  3336. usability, portability, and reliability fixes.
  3337. This release also fixes TROVE-2020-001, a medium-severity denial of
  3338. service vulnerability affecting all versions of Tor when compiled with
  3339. the NSS encryption library. (This is not the default configuration.)
  3340. Using this vulnerability, an attacker could cause an affected Tor
  3341. instance to crash remotely. This issue is also tracked as CVE-2020-
  3342. 15572. Anybody running a version of Tor built with the NSS library
  3343. should upgrade to 0.3.5.11, 0.4.2.8, 0.4.3.6, or 0.4.4.2-alpha
  3344. or later.
  3345. o Major bugfixes (NSS, security, backport from 0.4.4.2-alpha):
  3346. - Fix a crash due to an out-of-bound memory access when Tor is
  3347. compiled with NSS support. Fixes bug 33119; bugfix on
  3348. 0.3.5.1-alpha. This issue is also tracked as TROVE-2020-001
  3349. and CVE-2020-15572.
  3350. o Major bugfixes (DoS defenses, bridges, pluggable transport, backport from 0.4.3.4-rc):
  3351. - Fix a bug that was preventing DoS defenses from running on bridges
  3352. with a pluggable transport. Previously, the DoS subsystem was not
  3353. given the transport name of the client connection, thus failed to
  3354. find the GeoIP cache entry for that client address. Fixes bug
  3355. 33491; bugfix on 0.3.3.2-alpha.
  3356. o Minor features (testing, backport from 0.4.3.4-rc):
  3357. - The unit tests now support a "TOR_SKIP_TESTCASES" environment
  3358. variable to specify a list of space-separated test cases that
  3359. should not be executed. We will use this to disable certain tests
  3360. that are failing on Appveyor because of mismatched OpenSSL
  3361. libraries. Part of ticket 33643.
  3362. o Minor bugfix (CI, Windows, backport from 0.4.4.2-alpha):
  3363. - Use the correct 64-bit printf format when compiling with MINGW on
  3364. Appveyor. Fixes bug 40026; bugfix on 0.3.5.5-alpha.
  3365. o Minor bugfix (relay, configuration, backport from 0.4.3.3-alpha):
  3366. - Warn if the ContactInfo field is not set, and tell the relay
  3367. operator that not having a ContactInfo field set might cause their
  3368. relay to get rejected in the future. Fixes bug 33361; bugfix
  3369. on 0.1.1.10-alpha.
  3370. o Minor bugfixes (client performance, backport from 0.4.4.1-alpha):
  3371. - Resume use of preemptively-built circuits when UseEntryGuards is set
  3372. to 0. We accidentally disabled this feature with that config
  3373. setting, leading to slower load times. Fixes bug 34303; bugfix
  3374. on 0.3.3.2-alpha.
  3375. o Minor bugfixes (compiler compatibility, backport from 0.4.3.5):
  3376. - Avoid compiler warnings from Clang 10 related to the use of GCC-
  3377. style "/* falls through */" comments. Both Clang and GCC allow
  3378. __attribute__((fallthrough)) instead, so that's what we're using
  3379. now. Fixes bug 34078; bugfix on 0.3.1.3-alpha.
  3380. o Minor bugfixes (compiler warnings, backport from 0.4.4.2-alpha):
  3381. - Fix a compiler warning on platforms with 32-bit time_t values.
  3382. Fixes bug 40028; bugfix on 0.3.2.8-rc.
  3383. o Minor bugfixes (embedded Tor, backport from 0.4.3.1-alpha):
  3384. - When starting Tor any time after the first time in a process,
  3385. register the thread in which it is running as the main thread.
  3386. Previously, we only did this on Windows, which could lead to bugs
  3387. like 23081 on non-Windows platforms. Fixes bug 32884; bugfix
  3388. on 0.3.3.1-alpha.
  3389. o Minor bugfixes (key portability, backport from 0.4.3.4-rc):
  3390. - When reading PEM-encoded key data, tolerate CRLF line-endings even
  3391. if we are not running on Windows. Previously, non-Windows hosts
  3392. would reject these line-endings in certain positions, making
  3393. certain key files hard to move from one host to another. Fixes bug
  3394. 33032; bugfix on 0.3.5.1-alpha.
  3395. o Minor bugfixes (logging, backport from 0.4.4.2-alpha):
  3396. - Downgrade a noisy log message that could occur naturally when
  3397. receiving an extrainfo document that we no longer want. Fixes bug
  3398. 16016; bugfix on 0.2.6.3-alpha.
  3399. o Minor bugfixes (onion service v3, client, backport from 0.4.3.3-alpha):
  3400. - Remove a BUG() warning that would cause a stack trace if an onion
  3401. service descriptor was freed while we were waiting for a
  3402. rendezvous circuit to complete. Fixes bug 28992; bugfix
  3403. on 0.3.2.1-alpha.
  3404. o Testing (CI, backport from 0.4.3.4-rc):
  3405. - In our Appveyor Windows CI, copy required DLLs to test and app
  3406. directories, before running tor's tests. This ensures that tor.exe
  3407. and test*.exe use the correct version of each DLL. This fix is not
  3408. required, but we hope it will avoid DLL search issues in future.
  3409. Fixes bug 33673; bugfix on 0.3.4.2-alpha.
  3410. - On Appveyor, skip the crypto/openssl_version test, which is
  3411. failing because of a mismatched library installation. Fix
  3412. for 33643.
  3413. Changes in version 0.4.2.8 - 2020-07-09
  3414. Tor 0.4.2.8 backports various fixes from later releases, including
  3415. several that affect usability and portability.
  3416. This release also fixes TROVE-2020-001, a medium-severity denial of
  3417. service vulnerability affecting all versions of Tor when compiled with
  3418. the NSS encryption library. (This is not the default configuration.)
  3419. Using this vulnerability, an attacker could cause an affected Tor
  3420. instance to crash remotely. This issue is also tracked as CVE-2020-
  3421. 15572. Anybody running a version of Tor built with the NSS library
  3422. should upgrade to 0.3.5.11, 0.4.2.8, 0.4.3.6, or 0.4.4.2-alpha
  3423. or later.
  3424. o Major bugfixes (NSS, security, backport from 0.4.4.2-alpha):
  3425. - Fix a crash due to an out-of-bound memory access when Tor is
  3426. compiled with NSS support. Fixes bug 33119; bugfix on
  3427. 0.3.5.1-alpha. This issue is also tracked as TROVE-2020-001
  3428. and CVE-2020-15572.
  3429. o Major bugfixes (DoS defenses, bridges, pluggable transport, backport from 0.4.3.4-rc):
  3430. - Fix a bug that was preventing DoS defenses from running on bridges
  3431. with a pluggable transport. Previously, the DoS subsystem was not
  3432. given the transport name of the client connection, thus failed to
  3433. find the GeoIP cache entry for that client address. Fixes bug
  3434. 33491; bugfix on 0.3.3.2-alpha.
  3435. o Minor feature (sendme, flow control, backport form 0.4.3.4-rc):
  3436. - Default to sending SENDME version 1 cells. (Clients are already
  3437. sending these, because of a consensus parameter telling them to do
  3438. so: this change only affects what clients would do if the
  3439. consensus didn't contain a recommendation.) Closes ticket 33623.
  3440. o Minor features (diagnostic, backport from 0.4.3.3-alpha):
  3441. - Improve assertions and add some memory-poisoning code to try to
  3442. track down possible causes of a rare crash (32564) in the EWMA
  3443. code. Closes ticket 33290.
  3444. o Minor features (testing, backport from 0.4.3.4-rc):
  3445. - The unit tests now support a "TOR_SKIP_TESTCASES" environment
  3446. variable to specify a list of space-separated test cases that
  3447. should not be executed. We will use this to disable certain tests
  3448. that are failing on Appveyor because of mismatched OpenSSL
  3449. libraries. Part of ticket 33643.
  3450. o Minor bugfix (CI, Windows, backport from 0.4.4.2-alpha):
  3451. - Use the correct 64-bit printf format when compiling with MINGW on
  3452. Appveyor. Fixes bug 40026; bugfix on 0.3.5.5-alpha.
  3453. o Minor bugfix (relay, configuration, backport from 0.4.3.3-alpha):
  3454. - Warn if the ContactInfo field is not set, and tell the relay
  3455. operator that not having a ContactInfo field set might cause their
  3456. relay to get rejected in the future. Fixes bug 33361; bugfix
  3457. on 0.1.1.10-alpha.
  3458. o Minor bugfixes (client performance, backport from 0.4.4.1-alpha):
  3459. - Resume use of preemptively-built circuits when UseEntryGuards is set
  3460. to 0. We accidentally disabled this feature with that config
  3461. setting, leading to slower load times. Fixes bug 34303; bugfix
  3462. on 0.3.3.2-alpha.
  3463. o Minor bugfixes (compiler compatibility, backport from 0.4.3.5):
  3464. - Avoid compiler warnings from Clang 10 related to the use of GCC-
  3465. style "/* falls through */" comments. Both Clang and GCC allow
  3466. __attribute__((fallthrough)) instead, so that's what we're using
  3467. now. Fixes bug 34078; bugfix on 0.3.1.3-alpha.
  3468. - Fix compilation warnings with GCC 10.0.1. Fixes bug 34077; bugfix
  3469. on 0.4.0.3-alpha.
  3470. o Minor bugfixes (compiler warnings, backport from 0.4.4.2-alpha):
  3471. - Fix a compiler warning on platforms with 32-bit time_t values.
  3472. Fixes bug 40028; bugfix on 0.3.2.8-rc.
  3473. o Minor bugfixes (controller protocol, backport from 0.4.3.2-alpha):
  3474. - When receiving "ACTIVE" or "DORMANT" signals on the control port,
  3475. report them as SIGNAL events. Previously we would log a bug
  3476. warning. Fixes bug 33104; bugfix on 0.4.0.1-alpha.
  3477. o Minor bugfixes (embedded Tor, backport from 0.4.3.1-alpha):
  3478. - When starting Tor any time after the first time in a process,
  3479. register the thread in which it is running as the main thread.
  3480. Previously, we only did this on Windows, which could lead to bugs
  3481. like 23081 on non-Windows platforms. Fixes bug 32884; bugfix
  3482. on 0.3.3.1-alpha.
  3483. o Minor bugfixes (key portability, backport from 0.4.3.4-rc):
  3484. - When reading PEM-encoded key data, tolerate CRLF line-endings even
  3485. if we are not running on Windows. Previously, non-Windows hosts
  3486. would reject these line-endings in certain positions, making
  3487. certain key files hard to move from one host to another. Fixes bug
  3488. 33032; bugfix on 0.3.5.1-alpha.
  3489. o Minor bugfixes (logging, backport from 0.4.3.2-rc):
  3490. - When logging a bug, do not say "Future instances of this warning
  3491. will be silenced" unless we are actually going to silence them.
  3492. Previously we would say this whenever a BUG() check failed in the
  3493. code. Fixes bug 33095; bugfix on 0.4.1.1-alpha.
  3494. o Minor bugfixes (logging, backport from 0.4.3.4-rc):
  3495. - Flush stderr, stdout, and file logs during shutdown, if supported
  3496. by the OS. This change helps make sure that any final logs are
  3497. recorded. Fixes bug 33087; bugfix on 0.4.1.6.
  3498. o Minor bugfixes (logging, backport from 0.4.4.2-alpha):
  3499. - Downgrade a noisy log message that could occur naturally when
  3500. receiving an extrainfo document that we no longer want. Fixes bug
  3501. 16016; bugfix on 0.2.6.3-alpha.
  3502. o Minor bugfixes (onion service v3, client, backport from 0.4.3.3-alpha):
  3503. - Remove a BUG() warning that would cause a stack trace if an onion
  3504. service descriptor was freed while we were waiting for a
  3505. rendezvous circuit to complete. Fixes bug 28992; bugfix
  3506. on 0.3.2.1-alpha.
  3507. o Testing (CI, backport from 0.4.3.4-rc):
  3508. - In our Appveyor Windows CI, copy required DLLs to test and app
  3509. directories, before running tor's tests. This ensures that tor.exe
  3510. and test*.exe use the correct version of each DLL. This fix is not
  3511. required, but we hope it will avoid DLL search issues in future.
  3512. Fixes bug 33673; bugfix on 0.3.4.2-alpha.
  3513. - On Appveyor, skip the crypto/openssl_version test, which is
  3514. failing because of a mismatched library installation. Fix
  3515. for 33643.
  3516. Changes in version 0.4.3.6 - 2020-07-09
  3517. Tor 0.4.3.6 backports several bugfixes from later releases, including
  3518. some affecting usability.
  3519. This release also fixes TROVE-2020-001, a medium-severity denial of
  3520. service vulnerability affecting all versions of Tor when compiled with
  3521. the NSS encryption library. (This is not the default configuration.)
  3522. Using this vulnerability, an attacker could cause an affected Tor
  3523. instance to crash remotely. This issue is also tracked as CVE-2020-
  3524. 15572. Anybody running a version of Tor built with the NSS library
  3525. should upgrade to 0.3.5.11, 0.4.2.8, 0.4.3.6, or 0.4.4.2-alpha
  3526. or later.
  3527. o Major bugfixes (NSS, security, backport from 0.4.4.2-alpha):
  3528. - Fix a crash due to an out-of-bound memory access when Tor is
  3529. compiled with NSS support. Fixes bug 33119; bugfix on
  3530. 0.3.5.1-alpha. This issue is also tracked as TROVE-2020-001
  3531. and CVE-2020-15572.
  3532. o Minor bugfix (CI, Windows, backport from 0.4.4.2-alpha):
  3533. - Use the correct 64-bit printf format when compiling with MINGW on
  3534. Appveyor. Fixes bug 40026; bugfix on 0.3.5.5-alpha.
  3535. o Minor bugfixes (client performance, backport from 0.4.4.1-alpha):
  3536. - Resume use of preemptively-built circuits when UseEntryGuards is set
  3537. to 0. We accidentally disabled this feature with that config
  3538. setting, leading to slower load times. Fixes bug 34303; bugfix
  3539. on 0.3.3.2-alpha.
  3540. o Minor bugfixes (compiler warnings, backport from 0.4.4.2-alpha):
  3541. - Fix a compiler warning on platforms with 32-bit time_t values.
  3542. Fixes bug 40028; bugfix on 0.3.2.8-rc.
  3543. o Minor bugfixes (linux seccomp sandbox, nss, backport from 0.4.4.1-alpha):
  3544. - Fix a startup crash when tor is compiled with --enable-nss and
  3545. sandbox support is enabled. Fixes bug 34130; bugfix on
  3546. 0.3.5.1-alpha. Patch by Daniel Pinto.
  3547. o Minor bugfixes (logging, backport from 0.4.4.2-alpha):
  3548. - Downgrade a noisy log message that could occur naturally when
  3549. receiving an extrainfo document that we no longer want. Fixes bug
  3550. 16016; bugfix on 0.2.6.3-alpha.
  3551. o Minor bugfixes (manual page, backport from 0.4.4.1-alpha):
  3552. - Update the man page to reflect that MinUptimeHidServDirectoryV2
  3553. defaults to 96 hours. Fixes bug 34299; bugfix on 0.2.6.3-alpha.
  3554. o Minor bugfixes (onion service v3, backport from 0.4.4.1-alpha):
  3555. - Prevent an assert() that would occur when cleaning the client
  3556. descriptor cache, and attempting to close circuits for a non-
  3557. decrypted descriptor (lacking client authorization). Fixes bug
  3558. 33458; bugfix on 0.4.2.1-alpha.
  3559. o Minor bugfixes (portability, backport from 0.4.4.1-alpha):
  3560. - Fix a portability error in the configure script, where we were
  3561. using "==" instead of "=". Fixes bug 34233; bugfix on 0.4.3.5.
  3562. o Minor bugfixes (relays, backport from 0.4.4.1-alpha):
  3563. - Stop advertising incorrect IPv6 ORPorts in relay and bridge
  3564. descriptors, when the IPv6 port was configured as "auto". Fixes
  3565. bug 32588; bugfix on 0.2.3.9-alpha.
  3566. o Documentation (backport from 0.4.4.1-alpha):
  3567. - Fix several doxygen warnings related to imbalanced groups. Closes
  3568. ticket 34255.
  3569. Changes in version 0.4.3.5 - 2020-05-15
  3570. Tor 0.4.3.5 is the first stable release in the 0.4.3.x series. This
  3571. series adds support for building without relay code enabled, and
  3572. implements functionality needed for OnionBalance with v3 onion
  3573. services. It includes significant refactoring of our configuration and
  3574. controller functionality, and fixes numerous smaller bugs and
  3575. performance issues.
  3576. Per our support policy, we support each stable release series for nine
  3577. months after its first stable release, or three months after the first
  3578. stable release of the next series: whichever is longer. This means
  3579. that 0.4.3.x will be supported until around February 2021--later, if
  3580. 0.4.4.x is later than anticipated.
  3581. Note also that support for 0.4.1.x is about to end on May 20 of this
  3582. year; 0.4.2.x will be supported until September 15. We still plan to
  3583. continue supporting 0.3.5.x, our long-term stable series, until
  3584. Feb 2022.
  3585. Below are the changes since 0.4.2.6. For a list of only the changes
  3586. since 0.4.3.4-rc, see the ChangeLog file.
  3587. o New system requirements:
  3588. - When building Tor, you now need to have Python 3 in order to run
  3589. the integration tests. (Python 2 is officially unsupported
  3590. upstream, as of 1 Jan 2020.) Closes ticket 32608.
  3591. o Major features (build system):
  3592. - The relay code can now be disabled using the --disable-module-relay
  3593. configure option. When this option is set, we also disable the
  3594. dirauth module. Closes ticket 32123.
  3595. - When Tor is compiled --disable-module-relay, we also omit the code
  3596. used to act as a directory cache. Closes ticket 32487.
  3597. o Major features (directory authority, ed25519):
  3598. - Add support for banning a relay's ed25519 keys in the approved-
  3599. routers file. This will help us migrate away from RSA keys in the
  3600. future. Previously, only RSA keys could be banned in approved-
  3601. routers. Resolves ticket 22029. Patch by Neel Chauhan.
  3602. o Major features (onion services):
  3603. - New control port commands to manage client-side onion service
  3604. authorization credentials. The ONION_CLIENT_AUTH_ADD command adds
  3605. a credential, ONION_CLIENT_AUTH_REMOVE deletes a credential, and
  3606. ONION_CLIENT_AUTH_VIEW lists the credentials. Closes ticket 30381.
  3607. - Introduce a new SocksPort flag, ExtendedErrors, to support more
  3608. detailed error codes in information for applications that support
  3609. them. Closes ticket 30382; implements proposal 304.
  3610. o Major features (proxy):
  3611. - In addition to its current supported proxy types (HTTP CONNECT,
  3612. SOCKS4, and SOCKS5), Tor can now make its OR connections through a
  3613. HAProxy server. A new torrc option was added to specify the
  3614. address/port of the server: TCPProxy <protocol> <host>:<port>.
  3615. Currently the only supported protocol for the option is haproxy.
  3616. Closes ticket 31518. Patch done by Suphanat Chunhapanya (haxxpop).
  3617. o Major bugfixes (security, denial-of-service):
  3618. - Fix a denial-of-service bug that could be used by anyone to
  3619. consume a bunch of CPU on any Tor relay or authority, or by
  3620. directories to consume a bunch of CPU on clients or hidden
  3621. services. Because of the potential for CPU consumption to
  3622. introduce observable timing patterns, we are treating this as a
  3623. high-severity security issue. Fixes bug 33119; bugfix on
  3624. 0.2.1.5-alpha. Found by OSS-Fuzz. We are also tracking this issue
  3625. as TROVE-2020-002 and CVE-2020-10592.
  3626. o Major bugfixes (circuit padding, memory leak):
  3627. - Avoid a remotely triggered memory leak in the case that a circuit
  3628. padding machine is somehow negotiated twice on the same circuit.
  3629. Fixes bug 33619; bugfix on 0.4.0.1-alpha. Found by Tobias Pulls.
  3630. This is also tracked as TROVE-2020-004 and CVE-2020-10593.
  3631. o Major bugfixes (directory authority):
  3632. - Directory authorities will now send a 503 (not enough bandwidth)
  3633. code to clients when under bandwidth pressure. Known relays and
  3634. other authorities will always be answered regardless of the
  3635. bandwidth situation. Fixes bug 33029; bugfix on 0.1.2.5-alpha.
  3636. o Major bugfixes (DoS defenses, bridges, pluggable transport):
  3637. - Fix a bug that was preventing DoS defenses from running on bridges
  3638. with a pluggable transport. Previously, the DoS subsystem was not
  3639. given the transport name of the client connection, thus failed to
  3640. find the GeoIP cache entry for that client address. Fixes bug
  3641. 33491; bugfix on 0.3.3.2-alpha.
  3642. o Major bugfixes (networking):
  3643. - Correctly handle IPv6 addresses in SOCKS5 RESOLVE_PTR requests,
  3644. and accept strings as well as binary addresses. Fixes bug 32315;
  3645. bugfix on 0.3.5.1-alpha.
  3646. o Major bugfixes (onion service):
  3647. - Report HS circuit failure back into the HS subsystem so we take
  3648. appropriate action with regards to the client introduction point
  3649. failure cache. This improves reachability of onion services, since
  3650. now clients notice failing introduction circuits properly. Fixes
  3651. bug 32020; bugfix on 0.3.2.1-alpha.
  3652. o Minor feature (heartbeat, onion service):
  3653. - Add the DoS INTRODUCE2 defenses counter to the heartbeat DoS
  3654. message. Closes ticket 31371.
  3655. o Minor feature (sendme, flow control):
  3656. - Default to sending SENDME version 1 cells. (Clients are already
  3657. sending these, because of a consensus parameter telling them to do
  3658. so: this change only affects what clients would do if the
  3659. consensus didn't contain a recommendation.) Closes ticket 33623.
  3660. o Minor features (best practices tracker):
  3661. - Practracker now supports a --regen-overbroad option to regenerate
  3662. the exceptions file, but only to revise exceptions to be _less_
  3663. tolerant of best-practices violations. Closes ticket 32372.
  3664. o Minor features (configuration validation):
  3665. - Configuration validation can now be done by per-module callbacks,
  3666. rather than a global validation function. This will let us reduce
  3667. the size of config.c and some of its more cumbersome functions.
  3668. Closes ticket 31241.
  3669. o Minor features (configuration):
  3670. - If a configured hardware crypto accelerator in AccelName is
  3671. prefixed with "!", Tor now exits when it cannot be found. Closes
  3672. ticket 32406.
  3673. - We now use flag-driven logic to warn about obsolete configuration
  3674. fields, so that we can include their names. In 0.4.2, we used a
  3675. special type, which prevented us from generating good warnings.
  3676. Implements ticket 32404.
  3677. o Minor features (configure, build system):
  3678. - Output a list of enabled/disabled features at the end of the
  3679. configure process in a pleasing way. Closes ticket 31373.
  3680. o Minor features (continuous integration):
  3681. - Run Doxygen Makefile target on Travis, so we can learn about
  3682. regressions in our internal documentation. Closes ticket 32455.
  3683. - Stop allowing failures on the Travis CI stem tests job. It looks
  3684. like all the stem hangs we were seeing before are now fixed.
  3685. Closes ticket 33075.
  3686. o Minor features (controller):
  3687. - Add stream isolation data to STREAM event. Closes ticket 19859.
  3688. - Implement a new GETINFO command to fetch microdescriptor
  3689. consensus. Closes ticket 31684.
  3690. o Minor features (debugging, directory system):
  3691. - Don't crash when we find a non-guard with a guard-fraction value
  3692. set. Instead, log a bug warning, in an attempt to figure out how
  3693. this happened. Diagnostic for ticket 32868.
  3694. o Minor features (defense in depth):
  3695. - Add additional checks around tor_vasprintf() usage, in case the
  3696. function returns an error. Patch by Tobias Stoeckmann. Fixes
  3697. ticket 31147.
  3698. o Minor features (developer tools):
  3699. - Remove the 0.2.9.x series branches from git scripts (git-merge-
  3700. forward.sh, git-pull-all.sh, git-push-all.sh, git-setup-dirs.sh).
  3701. Closes ticket 32772.
  3702. - Add a check_cocci_parse.sh script that checks that new code is
  3703. parseable by Coccinelle. Add an exceptions file for unparseable
  3704. files, and run the script from travis CI. Closes ticket 31919.
  3705. - Call the check_cocci_parse.sh script from a 'check-cocci' Makefile
  3706. target. Closes ticket 31919.
  3707. - Add a rename_c_identifiers.py tool to rename a bunch of C
  3708. identifiers at once, and generate a well-formed commit message
  3709. describing the change. This should help with refactoring. Closes
  3710. ticket 32237.
  3711. - Add some scripts in "scripts/coccinelle" to invoke the Coccinelle
  3712. semantic patching tool with the correct flags. These flags are
  3713. fairly easy to forget, and these scripts should help us use
  3714. Coccinelle more effectively in the future. Closes ticket 31705.
  3715. o Minor features (diagnostic):
  3716. - Improve assertions and add some memory-poisoning code to try to
  3717. track down possible causes of a rare crash (32564) in the EWMA
  3718. code. Closes ticket 33290.
  3719. o Minor features (directory authorities):
  3720. - Directory authorities now reject descriptors from relays running
  3721. Tor versions from the 0.2.9 and 0.4.0 series. The 0.3.5 series is
  3722. still allowed. Resolves ticket 32672. Patch by Neel Chauhan.
  3723. o Minor features (Doxygen):
  3724. - Update Doxygen configuration file to a more recent template (from
  3725. 1.8.15). Closes ticket 32110.
  3726. - "make doxygen" now works with out-of-tree builds. Closes
  3727. ticket 32113.
  3728. - Make sure that doxygen outputs documentation for all of our C
  3729. files. Previously, some were missing @file declarations, causing
  3730. them to be ignored. Closes ticket 32307.
  3731. - Our "make doxygen" target now respects --enable-fatal-warnings by
  3732. default, and does not warn about items that are missing
  3733. documentation. To warn about missing documentation, run configure
  3734. with the "--enable-missing-doc-warnings" flag: doing so suspends
  3735. fatal warnings for doxygen. Closes ticket 32385.
  3736. o Minor features (git scripts):
  3737. - Add TOR_EXTRA_CLONE_ARGS to git-setup-dirs.sh for git clone
  3738. customisation. Closes ticket 32347.
  3739. - Add git-setup-dirs.sh, which sets up an upstream git repository
  3740. and worktrees for tor maintainers. Closes ticket 29603.
  3741. - Add TOR_EXTRA_REMOTE_* to git-setup-dirs.sh for a custom extra
  3742. remote. Closes ticket 32347.
  3743. - Call the check_cocci_parse.sh script from the git commit and push
  3744. hooks. Closes ticket 31919.
  3745. - Make git-push-all.sh skip unchanged branches when pushing to
  3746. upstream. The script already skipped unchanged test branches.
  3747. Closes ticket 32216.
  3748. - Make git-setup-dirs.sh create a master symlink in the worktree
  3749. directory. Closes ticket 32347.
  3750. - Skip unmodified source files when doing some existing git hook
  3751. checks. Related to ticket 31919.
  3752. o Minor features (IPv6, client):
  3753. - Make Tor clients tell dual-stack exits that they prefer IPv6
  3754. connections. This change is equivalent to setting the PreferIPv6
  3755. flag on SOCKSPorts (and most other listener ports). Tor Browser
  3756. has been setting this flag for some time, and we want to remove a
  3757. client distinguisher at exits. Closes ticket 32637.
  3758. o Minor features (portability, android):
  3759. - When building for Android, disable some tests that depend on $HOME
  3760. and/or pwdb, which Android doesn't have. Closes ticket 32825.
  3761. Patch from Hans-Christoph Steiner.
  3762. o Minor features (relay modularity):
  3763. - Split the relay and server pluggable transport config code into
  3764. separate files in the relay module. Disable this code when the
  3765. relay module is disabled. Closes part of ticket 32213.
  3766. - When the relay module is disabled, reject attempts to set the
  3767. ORPort, DirPort, DirCache, BridgeRelay, ExtORPort, or
  3768. ServerTransport* options, rather than ignoring the values of these
  3769. options. Closes part of ticket 32213.
  3770. - When the relay module is disabled, change the default config so
  3771. that DirCache is 0, and ClientOnly is 1. Closes ticket 32410.
  3772. o Minor features (release tools):
  3773. - Port our ChangeLog formatting and sorting tools to Python 3.
  3774. Closes ticket 32704.
  3775. o Minor features (testing):
  3776. - The unit tests now support a "TOR_SKIP_TESTCASES" environment
  3777. variable to specify a list of space-separated test cases that
  3778. should not be executed. We will use this to disable certain tests
  3779. that are failing on Appveyor because of mismatched OpenSSL
  3780. libraries. Part of ticket 33643.
  3781. - Detect some common failure cases for test_parseconf.sh in
  3782. src/test/conf_failures. Closes ticket 32451.
  3783. - Allow test_parseconf.sh to test expected log outputs for successful
  3784. configs, as well as failed configs. Closes ticket 32451.
  3785. - The test_parseconf.sh script now supports result variants for any
  3786. combination of the optional libraries lzma, nss, and zstd. Closes
  3787. ticket 32397.
  3788. - When running the unit tests on Android, create temporary files in
  3789. a subdirectory of /data/local/tmp. Closes ticket 32172. Based on a
  3790. patch from Hans-Christoph Steiner.
  3791. o Minor features (usability):
  3792. - Include more information when failing to parse a configuration
  3793. value. This should make it easier to tell what's going wrong when
  3794. a configuration file doesn't parse. Closes ticket 33460.
  3795. o Minor bugfix (relay, configuration):
  3796. - Warn if the ContactInfo field is not set, and tell the relay
  3797. operator that not having a ContactInfo field set might cause their
  3798. relay to get rejected in the future. Fixes bug 33361; bugfix
  3799. on 0.1.1.10-alpha.
  3800. o Minor bugfixes (bridges):
  3801. - Lowercase the configured value of BridgeDistribution before adding
  3802. it to the descriptor. Fixes bug 32753; bugfix on 0.3.2.3-alpha.
  3803. o Minor bugfixes (build system):
  3804. - Fix "make autostyle" for out-of-tree builds. Fixes bug 32370;
  3805. bugfix on 0.4.1.2-alpha.
  3806. o Minor bugfixes (compiler compatibility):
  3807. - Avoid compiler warnings from Clang 10 related to the use of GCC-
  3808. style "/* falls through */" comments. Both Clang and GCC allow
  3809. __attribute__((fallthrough)) instead, so that's what we're using
  3810. now. Fixes bug 34078; bugfix on 0.3.1.3-alpha.
  3811. - Fix compilation warnings with GCC 10.0.1. Fixes bug 34077; bugfix
  3812. on 0.4.0.3-alpha.
  3813. o Minor bugfixes (configuration handling):
  3814. - Make control_event_conf_changed() take in a config_line_t instead
  3815. of a smartlist of alternating key/value entries. Fixes bug 31531;
  3816. bugfix on 0.2.3.3-alpha. Patch by Neel Chauhan.
  3817. - Check for multiplication overflow when parsing memory units inside
  3818. configuration. Fixes bug 30920; bugfix on 0.0.9rc1.
  3819. - When dumping the configuration, stop adding a trailing space after
  3820. the option name when there is no option value. This issue only
  3821. affects options that accept an empty value or list. (Most options
  3822. reject empty values, or delete the entire line from the dumped
  3823. options.) Fixes bug 32352; bugfix on 0.0.9pre6.
  3824. - Avoid changing the user's value of HardwareAccel as stored by
  3825. SAVECONF, when AccelName is set but HardwareAccel is not. Fixes
  3826. bug 32382; bugfix on 0.2.2.1-alpha.
  3827. - When creating a KeyDirectory with the same location as the
  3828. DataDirectory (not recommended), respect the DataDirectory's
  3829. group-readable setting if one has not been set for the
  3830. KeyDirectory. Fixes bug 27992; bugfix on 0.3.3.1-alpha.
  3831. o Minor bugfixes (continuous integration):
  3832. - Remove the buggy and unused mirroring job. Fixes bug 33213; bugfix
  3833. on 0.3.2.2-alpha.
  3834. o Minor bugfixes (controller protocol):
  3835. - When receiving "ACTIVE" or "DORMANT" signals on the control port,
  3836. report them as SIGNAL events. Previously we would log a bug
  3837. warning. Fixes bug 33104; bugfix on 0.4.0.1-alpha.
  3838. o Minor bugfixes (controller):
  3839. - In routerstatus_has_changed(), check all the fields that are
  3840. output over the control port. Fixes bug 20218; bugfix
  3841. on 0.1.1.11-alpha.
  3842. o Minor bugfixes (developer tools):
  3843. - Allow paths starting with ./ in scripts/add_c_file.py. Fixes bug
  3844. 31336; bugfix on 0.4.1.2-alpha.
  3845. o Minor bugfixes (dirauth module):
  3846. - Split the dirauth config code into a separate file in the dirauth
  3847. module. Disable this code when the dirauth module is disabled.
  3848. Closes ticket 32213.
  3849. - When the dirauth module is disabled, reject attempts to set the
  3850. AuthoritativeDir option, rather than ignoring the value of the
  3851. option. Fixes bug 32213; bugfix on 0.3.4.1-alpha.
  3852. o Minor bugfixes (embedded Tor):
  3853. - When starting Tor any time after the first time in a process,
  3854. register the thread in which it is running as the main thread.
  3855. Previously, we only did this on Windows, which could lead to bugs
  3856. like 23081 on non-Windows platforms. Fixes bug 32884; bugfix
  3857. on 0.3.3.1-alpha.
  3858. o Minor bugfixes (git scripts):
  3859. - Avoid sleeping before the last push in git-push-all.sh. Closes
  3860. ticket 32216.
  3861. - Forward all unrecognised arguments in git-push-all.sh to git push.
  3862. Closes ticket 32216.
  3863. o Minor bugfixes (key portability):
  3864. - When reading PEM-encoded key data, tolerate CRLF line-endings even
  3865. if we are not running on Windows. Previously, non-Windows hosts
  3866. would reject these line-endings in certain positions, making
  3867. certain key files hard to move from one host to another. Fixes bug
  3868. 33032; bugfix on 0.3.5.1-alpha.
  3869. o Minor bugfixes (logging):
  3870. - Stop truncating IPv6 addresses and ports in channel and connection
  3871. logs. Fixes bug 33918; bugfix on 0.2.4.4-alpha.
  3872. - Flush stderr, stdout, and file logs during shutdown, if supported
  3873. by the OS. This change helps make sure that any final logs are
  3874. recorded. Fixes bug 33087; bugfix on 0.4.1.6.
  3875. - Stop closing stderr and stdout during shutdown. Closing these file
  3876. descriptors can hide sanitiser logs. Fixes bug 33087; bugfix
  3877. on 0.4.1.6.
  3878. - If we encounter a bug when flushing a buffer to a TLS connection,
  3879. only log the bug once per invocation of the Tor process.
  3880. Previously we would log with every occurrence, which could cause
  3881. us to run out of disk space. Fixes bug 33093; bugfix
  3882. on 0.3.2.2-alpha.
  3883. - When logging a bug, do not say "Future instances of this warning
  3884. will be silenced" unless we are actually going to silence them.
  3885. Previously we would say this whenever a BUG() check failed in the
  3886. code. Fixes bug 33095; bugfix on 0.4.1.1-alpha.
  3887. o Minor bugfixes (onion services v2):
  3888. - Move a series of v2 onion service warnings to protocol-warning
  3889. level because they can all be triggered remotely by a malformed
  3890. request. Fixes bug 32706; bugfix on 0.1.1.14-alpha.
  3891. - When sending the INTRO cell for a v2 Onion Service, look at the
  3892. failure cache alongside timeout values to check if the intro point
  3893. is marked as failed. Previously, we only looked at the relay
  3894. timeout values. Fixes bug 25568; bugfix on 0.2.7.3-rc. Patch by
  3895. Neel Chauhan.
  3896. o Minor bugfixes (onion services v3):
  3897. - Remove a BUG() warning that would cause a stack trace if an onion
  3898. service descriptor was freed while we were waiting for a
  3899. rendezvous circuit to complete. Fixes bug 28992; bugfix
  3900. on 0.3.2.1-alpha.
  3901. - Relax severity of a log message that can appear naturally when
  3902. decoding onion service descriptors as a relay. Also add some
  3903. diagnostics to debug any future bugs in that area. Fixes bug
  3904. 31669; bugfix on 0.3.0.1-alpha.
  3905. - Fix an assertion failure that could result from a corrupted
  3906. ADD_ONION control port command. Found by Saibato. Fixes bug 33137;
  3907. bugfix on 0.3.3.1-alpha. This issue is also tracked
  3908. as TROVE-2020-003.
  3909. - Properly handle the client rendezvous circuit timeout. Previously
  3910. Tor would sometimes timeout a rendezvous circuit awaiting the
  3911. introduction ACK, and find itself unable to re-establish all
  3912. circuits because the rendezvous circuit timed out too early. Fixes
  3913. bug 32021; bugfix on 0.3.2.1-alpha.
  3914. o Minor bugfixes (onion services):
  3915. - Do not rely on a "circuit established" flag for intro circuits but
  3916. instead always query the HS circuit map. This is to avoid sync
  3917. issue with that flag and the map. Fixes bug 32094; bugfix
  3918. on 0.3.2.1-alpha.
  3919. o Minor bugfixes (onion services, all):
  3920. - In cancel_descriptor_fetches(), use
  3921. connection_list_by_type_purpose() instead of
  3922. connection_list_by_type_state(). Fixes bug 32639; bugfix on
  3923. 0.3.2.1-alpha. Patch by Neel Chauhan.
  3924. o Minor bugfixes (pluggable transports):
  3925. - When receiving a message on standard error from a pluggable
  3926. transport, log it at info level, rather than as a warning. Fixes
  3927. bug 33005; bugfix on 0.4.0.1-alpha.
  3928. o Minor bugfixes (rust, build):
  3929. - Fix a syntax warning given by newer versions of Rust that was
  3930. creating problems for our continuous integration. Fixes bug 33212;
  3931. bugfix on 0.3.5.1-alpha.
  3932. o Minor bugfixes (scripts):
  3933. - Fix update_versions.py for out-of-tree builds. Fixes bug 32371;
  3934. bugfix on 0.4.0.1-alpha.
  3935. o Minor bugfixes (testing):
  3936. - Use the same code to find the tor binary in all of our test
  3937. scripts. This change makes sure we are always using the coverage
  3938. binary when coverage is enabled. Fixes bug 32368; bugfix
  3939. on 0.2.7.3-rc.
  3940. - Stop ignoring "tor --dump-config" errors in test_parseconf.sh.
  3941. Fixes bug 32468; bugfix on 0.4.2.1-alpha.
  3942. - Our option-validation tests no longer depend on specially
  3943. configured non-default, non-passing sets of options. Previously,
  3944. the tests had been written to assume that options would _not_ be
  3945. set to their defaults, which led to needless complexity and
  3946. verbosity. Fixes bug 32175; bugfix on 0.2.8.1-alpha.
  3947. o Minor bugfixes (TLS bug handling):
  3948. - When encountering a bug in buf_read_from_tls(), return a "MISC"
  3949. error code rather than "WANTWRITE". This change might help avoid
  3950. some CPU-wasting loops if the bug is ever triggered. Bug reported
  3951. by opara. Fixes bug 32673; bugfix on 0.3.0.4-alpha.
  3952. o Deprecated features:
  3953. - Deprecate the ClientAutoIPv6ORPort option. This option was not
  3954. true "Happy Eyeballs", and often failed on connections that
  3955. weren't reliably dual-stack. Closes ticket 32942. Patch by
  3956. Neel Chauhan.
  3957. o Documentation:
  3958. - Provide a quickstart guide for a Circuit Padding Framework, and
  3959. documentation for researchers to implement and study circuit
  3960. padding machines. Closes ticket 28804.
  3961. - Add documentation in 'HelpfulTools.md' to describe how to build a
  3962. tag file. Closes ticket 32779.
  3963. - Create a high-level description of the long-term software
  3964. architecture goals. Closes ticket 32206.
  3965. - Describe the --dump-config command in the manual page. Closes
  3966. ticket 32467.
  3967. - Unite coding advice from this_not_that.md in torguts repo into our
  3968. coding standards document. Resolves ticket 31853.
  3969. o Removed features:
  3970. - Our Doxygen configuration no longer generates LaTeX output. The
  3971. reference manual produced by doing this was over 4000 pages long,
  3972. and generally unusable. Closes ticket 32099.
  3973. - The option "TestingEstimatedDescriptorPropagationTime" is now
  3974. marked as obsolete. It has had no effect since 0.3.0.7, when
  3975. clients stopped rejecting consensuses "from the future". Closes
  3976. ticket 32807.
  3977. - We no longer support consensus methods before method 28; these
  3978. methods were only used by authorities running versions of Tor that
  3979. are now at end-of-life. In effect, this means that clients,
  3980. relays, and authorities now assume that authorities will be
  3981. running version 0.3.5.x or later. Closes ticket 32695.
  3982. o Testing:
  3983. - Avoid conflicts between the fake sockets in tor's unit tests, and
  3984. real file descriptors. Resolves issues running unit tests with
  3985. GitHub Actions, where the process that embeds or launches the
  3986. tests has already opened a large number of file descriptors. Fixes
  3987. bug 33782; bugfix on 0.2.8.1-alpha. Found and fixed by
  3988. Putta Khunchalee.
  3989. - Add more test cases for tor's UTF-8 validation function. Also,
  3990. check the arguments passed to the function for consistency. Closes
  3991. ticket 32845.
  3992. - Improve test coverage for relay and dirauth config code, focusing
  3993. on option validation and normalization. Closes ticket 32213.
  3994. - Improve the consistency of test_parseconf.sh output, and run all
  3995. the tests, even if one fails. Closes ticket 32213.
  3996. - Run the practracker unit tests in the pre-commit git hook. Closes
  3997. ticket 32609.
  3998. o Code simplification and refactoring (channel):
  3999. - Channel layer had a variable length cell handler that was not used
  4000. and thus removed. Closes ticket 32892.
  4001. o Code simplification and refactoring (configuration):
  4002. - Immutability is now implemented as a flag on individual
  4003. configuration options rather than as part of the option-transition
  4004. checking code. Closes ticket 32344.
  4005. - Instead of keeping a list of configuration options to check for
  4006. relative paths, check all the options whose type is "FILENAME".
  4007. Solves part of ticket 32339.
  4008. - Our default log (which ordinarily sends NOTICE-level messages to
  4009. standard output) is now handled in a more logical manner.
  4010. Previously, we replaced the configured log options if they were
  4011. empty. Now, we interpret an empty set of log options as meaning
  4012. "use the default log". Closes ticket 31999.
  4013. - Remove some unused arguments from the options_validate() function,
  4014. to simplify our code and tests. Closes ticket 32187.
  4015. - Simplify the options_validate() code so that it looks at the
  4016. default options directly, rather than taking default options as an
  4017. argument. This change lets us simplify its interface. Closes
  4018. ticket 32185.
  4019. - Use our new configuration architecture to move most authority-
  4020. related options to the directory authority module. Closes
  4021. ticket 32806.
  4022. - When parsing the command line, handle options that determine our
  4023. "quiet level" and our mode of operation (e.g., --dump-config and
  4024. so on) all in one table. Closes ticket 32003.
  4025. o Code simplification and refactoring (controller):
  4026. - Create a new abstraction for formatting control protocol reply
  4027. lines based on key-value pairs. Refactor some existing control
  4028. protocol code to take advantage of this. Closes ticket 30984.
  4029. - Create a helper function that can fetch network status or
  4030. microdesc consensuses. Closes ticket 31684.
  4031. o Code simplification and refactoring (dirauth modularization):
  4032. - Remove the last remaining HAVE_MODULE_DIRAUTH inside a function.
  4033. Closes ticket 32163.
  4034. - Replace some confusing identifiers in process_descs.c. Closes
  4035. ticket 29826.
  4036. - Simplify some relay and dirauth config code. Closes ticket 32213.
  4037. o Code simplification and refactoring (mainloop):
  4038. - Simplify the ip_address_changed() function by removing redundant
  4039. checks. Closes ticket 33091.
  4040. o Code simplification and refactoring (misc):
  4041. - Make all the structs we declare follow the same naming convention
  4042. of ending with "_t". Closes ticket 32415.
  4043. - Move and rename some configuration-related code for clarity.
  4044. Closes ticket 32304.
  4045. - Our include.am files are now broken up by subdirectory.
  4046. Previously, src/core/include.am covered all of the subdirectories
  4047. in "core", "feature", and "app". Closes ticket 32137.
  4048. - Remove underused NS*() macros from test code: they make our tests
  4049. more confusing, especially for code-formatting tools. Closes
  4050. ticket 32887.
  4051. o Code simplification and refactoring (relay modularization):
  4052. - Disable relay_periodic when the relay module is disabled. Closes
  4053. ticket 32244.
  4054. - Disable relay_sys when the relay module is disabled. Closes
  4055. ticket 32245.
  4056. o Code simplification and refactoring (tool support):
  4057. - Add numerous missing dependencies to our include files, so that
  4058. they can be included in different reasonable orders and still
  4059. compile. Addresses part of ticket 32764.
  4060. - Fix some parts of our code that were difficult for Coccinelle to
  4061. parse. Related to ticket 31705.
  4062. - Fix some small issues in our code that prevented automatic
  4063. formatting tools from working. Addresses part of ticket 32764.
  4064. o Documentation (manpage):
  4065. - Alphabetize the Server and Directory server sections of the tor
  4066. manpage. Also split Statistics options into their own section of
  4067. the manpage. Closes ticket 33188. Work by Swati Thacker as part of
  4068. Google Season of Docs.
  4069. - Document the __OwningControllerProcess torrc option and specify
  4070. its polling interval. Resolves issue 32971.
  4071. - Split "Circuit Timeout" options and "Node Selection" options into
  4072. their own sections of the tor manpage. Closes tickets 32928 and
  4073. 32929. Work by Swati Thacker as part of Google Season of Docs.
  4074. - Alphabetize the Client Options section of the tor manpage. Closes
  4075. ticket 32846.
  4076. - Alphabetize the General Options section of the tor manpage. Closes
  4077. ticket 32708.
  4078. - In the tor(1) manpage, reword and improve formatting of the
  4079. COMMAND-LINE OPTIONS and DESCRIPTION sections. Closes ticket
  4080. 32277. Based on work by Swati Thacker as part of Google Season
  4081. of Docs.
  4082. - In the tor(1) manpage, reword and improve formatting of the FILES,
  4083. SEE ALSO, and BUGS sections. Closes ticket 32176. Based on work by
  4084. Swati Thacker as part of Google Season of Docs.
  4085. o Testing (Appveyor CI):
  4086. - In our Appveyor Windows CI, copy required DLLs to test and app
  4087. directories, before running tor's tests. This ensures that tor.exe
  4088. and test*.exe use the correct version of each DLL. This fix is not
  4089. required, but we hope it will avoid DLL search issues in future.
  4090. Fixes bug 33673; bugfix on 0.3.4.2-alpha.
  4091. - On Appveyor, skip the crypto/openssl_version test, which is
  4092. failing because of a mismatched library installation. Fix
  4093. for 33643.
  4094. o Testing (circuit, EWMA):
  4095. - Add unit tests for circuitmux and EWMA subsystems. Closes
  4096. ticket 32196.
  4097. o Testing (Travis CI):
  4098. - Remove a redundant distcheck job. Closes ticket 33194.
  4099. - Sort the Travis jobs in order of speed: putting the slowest jobs
  4100. first takes full advantage of Travis job concurrency. Closes
  4101. ticket 33194.
  4102. - Stop allowing the Chutney IPv6 Travis job to fail. This job was
  4103. previously configured to fast_finish (which requires
  4104. allow_failure), to speed up the build. Closes ticket 33195.
  4105. - When a Travis chutney job fails, use chutney's new "diagnostics.sh"
  4106. tool to produce detailed diagnostic output. Closes ticket 32792.
  4107. Changes in version 0.4.2.7 - 2020-03-18
  4108. This is the third stable release in the 0.4.2.x series. It backports
  4109. numerous fixes from later releases, including a fix for TROVE-2020-
  4110. 002, a major denial-of-service vulnerability that affected all
  4111. released Tor instances since 0.2.1.5-alpha. Using this vulnerability,
  4112. an attacker could cause Tor instances to consume a huge amount of CPU,
  4113. disrupting their operations for several seconds or minutes. This
  4114. attack could be launched by anybody against a relay, or by a directory
  4115. cache against any client that had connected to it. The attacker could
  4116. launch this attack as much as they wanted, thereby disrupting service
  4117. or creating patterns that could aid in traffic analysis. This issue
  4118. was found by OSS-Fuzz, and is also tracked as CVE-2020-10592.
  4119. We do not have reason to believe that this attack is currently being
  4120. exploited in the wild, but nonetheless we advise everyone to upgrade
  4121. as soon as packages are available.
  4122. o Major bugfixes (security, denial-of-service, backport from 0.4.3.3-alpha):
  4123. - Fix a denial-of-service bug that could be used by anyone to
  4124. consume a bunch of CPU on any Tor relay or authority, or by
  4125. directories to consume a bunch of CPU on clients or hidden
  4126. services. Because of the potential for CPU consumption to
  4127. introduce observable timing patterns, we are treating this as a
  4128. high-severity security issue. Fixes bug 33119; bugfix on
  4129. 0.2.1.5-alpha. Found by OSS-Fuzz. We are also tracking this issue
  4130. as TROVE-2020-002 and CVE-2020-10592.
  4131. o Major bugfixes (circuit padding, memory leak, backport from 0.4.3.3-alpha):
  4132. - Avoid a remotely triggered memory leak in the case that a circuit
  4133. padding machine is somehow negotiated twice on the same circuit.
  4134. Fixes bug 33619; bugfix on 0.4.0.1-alpha. Found by Tobias Pulls.
  4135. This is also tracked as TROVE-2020-004 and CVE-2020-10593.
  4136. o Major bugfixes (directory authority, backport from 0.4.3.3-alpha):
  4137. - Directory authorities will now send a 503 (not enough bandwidth)
  4138. code to clients when under bandwidth pressure. Known relays and
  4139. other authorities will always be answered regardless of the
  4140. bandwidth situation. Fixes bug 33029; bugfix on 0.1.2.5-alpha.
  4141. o Minor features (continuous integration, backport from 0.4.3.2-alpha):
  4142. - Stop allowing failures on the Travis CI stem tests job. It looks
  4143. like all the stem hangs we were seeing before are now fixed.
  4144. Closes ticket 33075.
  4145. o Minor bugfixes (bridges, backport from 0.4.3.1-alpha):
  4146. - Lowercase the configured value of BridgeDistribution before adding
  4147. it to the descriptor. Fixes bug 32753; bugfix on 0.3.2.3-alpha.
  4148. o Minor bugfixes (logging, backport from 0.4.3.2-alpha):
  4149. - If we encounter a bug when flushing a buffer to a TLS connection,
  4150. only log the bug once per invocation of the Tor process.
  4151. Previously we would log with every occurrence, which could cause
  4152. us to run out of disk space. Fixes bug 33093; bugfix
  4153. on 0.3.2.2-alpha.
  4154. o Minor bugfixes (onion services v3, backport from 0.4.3.3-alpha):
  4155. - Fix an assertion failure that could result from a corrupted
  4156. ADD_ONION control port command. Found by Saibato. Fixes bug 33137;
  4157. bugfix on 0.3.3.1-alpha. This issue is also tracked
  4158. as TROVE-2020-003.
  4159. o Minor bugfixes (rust, build, backport from 0.4.3.2-alpha):
  4160. - Fix a syntax warning given by newer versions of Rust that was
  4161. creating problems for our continuous integration. Fixes bug 33212;
  4162. bugfix on 0.3.5.1-alpha.
  4163. o Testing (Travis CI, backport from 0.4.3.3-alpha):
  4164. - Remove a redundant distcheck job. Closes ticket 33194.
  4165. - Sort the Travis jobs in order of speed: putting the slowest jobs
  4166. first takes full advantage of Travis job concurrency. Closes
  4167. ticket 33194.
  4168. - Stop allowing the Chutney IPv6 Travis job to fail. This job was
  4169. previously configured to fast_finish (which requires
  4170. allow_failure), to speed up the build. Closes ticket 33195.
  4171. - When a Travis chutney job fails, use chutney's new "diagnostics.sh"
  4172. tool to produce detailed diagnostic output. Closes ticket 32792.
  4173. Changes in version 0.4.1.9 - 2020-03-18
  4174. Tor 0.4.1.9 backports important fixes from later Tor releases,
  4175. including a fix for TROVE-2020-002, a major denial-of-service
  4176. vulnerability that affected all released Tor instances since
  4177. 0.2.1.5-alpha. Using this vulnerability, an attacker could cause Tor
  4178. instances to consume a huge amount of CPU, disrupting their operations
  4179. for several seconds or minutes. This attack could be launched by
  4180. anybody against a relay, or by a directory cache against any client
  4181. that had connected to it. The attacker could launch this attack as
  4182. much as they wanted, thereby disrupting service or creating patterns
  4183. that could aid in traffic analysis. This issue was found by OSS-Fuzz,
  4184. and is also tracked as CVE-2020-10592.
  4185. We do not have reason to believe that this attack is currently being
  4186. exploited in the wild, but nonetheless we advise everyone to upgrade
  4187. as soon as packages are available.
  4188. o Major bugfixes (security, denial-of-service, backport from 0.4.3.3-alpha):
  4189. - Fix a denial-of-service bug that could be used by anyone to
  4190. consume a bunch of CPU on any Tor relay or authority, or by
  4191. directories to consume a bunch of CPU on clients or hidden
  4192. services. Because of the potential for CPU consumption to
  4193. introduce observable timing patterns, we are treating this as a
  4194. high-severity security issue. Fixes bug 33119; bugfix on
  4195. 0.2.1.5-alpha. Found by OSS-Fuzz. We are also tracking this issue
  4196. as TROVE-2020-002 and CVE-2020-10592.
  4197. o Major bugfixes (circuit padding, memory leak, backport from 0.4.3.3-alpha):
  4198. - Avoid a remotely triggered memory leak in the case that a circuit
  4199. padding machine is somehow negotiated twice on the same circuit.
  4200. Fixes bug 33619; bugfix on 0.4.0.1-alpha. Found by Tobias Pulls.
  4201. This is also tracked as TROVE-2020-004 and CVE-2020-10593.
  4202. o Minor bugfixes (bridges, backport from 0.4.3.1-alpha):
  4203. - Lowercase the configured value of BridgeDistribution before adding
  4204. it to the descriptor. Fixes bug 32753; bugfix on 0.3.2.3-alpha.
  4205. o Minor bugfixes (logging, backport from 0.4.3.2-alpha):
  4206. - If we encounter a bug when flushing a buffer to a TLS connection,
  4207. only log the bug once per invocation of the Tor process.
  4208. Previously we would log with every occurrence, which could cause
  4209. us to run out of disk space. Fixes bug 33093; bugfix
  4210. on 0.3.2.2-alpha.
  4211. o Minor bugfixes (onion services v3, backport from 0.4.3.3-alpha):
  4212. - Fix an assertion failure that could result from a corrupted
  4213. ADD_ONION control port command. Found by Saibato. Fixes bug 33137;
  4214. bugfix on 0.3.3.1-alpha. This issue is also tracked
  4215. as TROVE-2020-003.
  4216. o Minor bugfixes (rust, build, backport from 0.4.3.2-alpha):
  4217. - Fix a syntax warning given by newer versions of Rust that was
  4218. creating problems for our continuous integration. Fixes bug 33212;
  4219. bugfix on 0.3.5.1-alpha.
  4220. o Testing (Travis CI, backport from 0.4.3.3-alpha):
  4221. - Remove a redundant distcheck job. Closes ticket 33194.
  4222. - Sort the Travis jobs in order of speed: putting the slowest jobs
  4223. first takes full advantage of Travis job concurrency. Closes
  4224. ticket 33194.
  4225. - Stop allowing the Chutney IPv6 Travis job to fail. This job was
  4226. previously configured to fast_finish (which requires
  4227. allow_failure), to speed up the build. Closes ticket 33195.
  4228. - When a Travis chutney job fails, use chutney's new "diagnostics.sh"
  4229. tool to produce detailed diagnostic output. Closes ticket 32792.
  4230. Changes in version 0.3.5.10 - 2020-03-18
  4231. Tor 0.3.5.10 backports many fixes from later Tor releases, including a
  4232. fix for TROVE-2020-002, a major denial-of-service vulnerability that
  4233. affected all released Tor instances since 0.2.1.5-alpha. Using this
  4234. vulnerability, an attacker could cause Tor instances to consume a huge
  4235. amount of CPU, disrupting their operations for several seconds or
  4236. minutes. This attack could be launched by anybody against a relay, or
  4237. by a directory cache against any client that had connected to it. The
  4238. attacker could launch this attack as much as they wanted, thereby
  4239. disrupting service or creating patterns that could aid in traffic
  4240. analysis. This issue was found by OSS-Fuzz, and is also tracked
  4241. as CVE-2020-10592.
  4242. We do not have reason to believe that this attack is currently being
  4243. exploited in the wild, but nonetheless we advise everyone to upgrade
  4244. as soon as packages are available.
  4245. o Major bugfixes (security, denial-of-service, backport from 0.4.3.3-alpha):
  4246. - Fix a denial-of-service bug that could be used by anyone to
  4247. consume a bunch of CPU on any Tor relay or authority, or by
  4248. directories to consume a bunch of CPU on clients or hidden
  4249. services. Because of the potential for CPU consumption to
  4250. introduce observable timing patterns, we are treating this as a
  4251. high-severity security issue. Fixes bug 33119; bugfix on
  4252. 0.2.1.5-alpha. Found by OSS-Fuzz. We are also tracking this issue
  4253. as TROVE-2020-002 and CVE-2020-10592.
  4254. o Major bugfixes (linux seccomp sandbox, backport from 0.4.3.1-alpha):
  4255. - Correct how we use libseccomp. Particularly, stop assuming that
  4256. rules are applied in a particular order or that more rules are
  4257. processed after the first match. Neither is the case! In
  4258. libseccomp <2.4.0 this lead to some rules having no effect.
  4259. libseccomp 2.4.0 changed how rules are generated, leading to a
  4260. different ordering, which in turn led to a fatal crash during
  4261. startup. Fixes bug 29819; bugfix on 0.2.5.1-alpha. Patch by
  4262. Peter Gerber.
  4263. o Minor features (continuous integration, backport from 0.4.3.2-alpha):
  4264. - Stop allowing failures on the Travis CI stem tests job. It looks
  4265. like all the stem hangs we were seeing before are now fixed.
  4266. Closes ticket 33075.
  4267. o Minor bugfixes (bridges, backport from 0.4.3.1-alpha):
  4268. - Lowercase the configured value of BridgeDistribution before adding
  4269. it to the descriptor. Fixes bug 32753; bugfix on 0.3.2.3-alpha.
  4270. o Minor bugfixes (crash, backport from 0.4.2.4-rc):
  4271. - When running Tor with an option like --verify-config or
  4272. --dump-config that does not start the event loop, avoid crashing
  4273. if we try to exit early because of an error. Fixes bug 32407;
  4274. bugfix on 0.3.3.1-alpha.
  4275. o Minor bugfixes (logging, backport from 0.4.3.2-alpha):
  4276. - If we encounter a bug when flushing a buffer to a TLS connection,
  4277. only log the bug once per invocation of the Tor process.
  4278. Previously we would log with every occurrence, which could cause
  4279. us to run out of disk space. Fixes bug 33093; bugfix
  4280. on 0.3.2.2-alpha.
  4281. o Minor bugfixes (onion services v3, backport from 0.4.3.3-alpha):
  4282. - Fix an assertion failure that could result from a corrupted
  4283. ADD_ONION control port command. Found by Saibato. Fixes bug 33137;
  4284. bugfix on 0.3.3.1-alpha. This issue is also tracked
  4285. as TROVE-2020-003.
  4286. o Minor bugfixes (rust, build, backport from 0.4.3.2-alpha):
  4287. - Fix a syntax warning given by newer versions of Rust that was
  4288. creating problems for our continuous integration. Fixes bug 33212;
  4289. bugfix on 0.3.5.1-alpha.
  4290. o Testing (backport from 0.4.3.1-alpha):
  4291. - Re-enable the Travis CI macOS Chutney build, but don't let it
  4292. prevent the Travis job from finishing. (The Travis macOS jobs are
  4293. slow, so we don't want to have it delay the whole CI process.)
  4294. Closes ticket 32629.
  4295. - Turn off Tor's Sandbox in Chutney jobs, and run those jobs on
  4296. Ubuntu Bionic. Turning off the Sandbox is a work-around, until we
  4297. fix the sandbox errors in 32722. Closes ticket 32240.
  4298. o Testing (continuous integration, backport from 0.4.3.1-alpha):
  4299. - Use zstd in our Travis Linux builds. Closes ticket 32242.
  4300. o Testing (Travis CI, backport from 0.4.3.3-alpha):
  4301. - Remove a redundant distcheck job. Closes ticket 33194.
  4302. - Sort the Travis jobs in order of speed: putting the slowest jobs
  4303. first takes full advantage of Travis job concurrency. Closes
  4304. ticket 33194.
  4305. - Stop allowing the Chutney IPv6 Travis job to fail. This job was
  4306. previously configured to fast_finish (which requires
  4307. - When a Travis chutney job fails, use chutney's new "diagnostics.sh"
  4308. tool to produce detailed diagnostic output. Closes ticket 32792.
  4309. Changes in version 0.4.2.6 - 2020-01-30
  4310. This is the second stable release in the 0.4.2.x series. It backports
  4311. several bugfixes from 0.4.3.1-alpha, including some that had affected
  4312. the Linux seccomp2 sandbox or Windows services. If you're running with
  4313. one of those configurations, you'll probably want to upgrade;
  4314. otherwise, you should be fine with 0.4.2.5.
  4315. o Major bugfixes (linux seccomp sandbox, backport from 0.4.3.1-alpha):
  4316. - Correct how we use libseccomp. Particularly, stop assuming that
  4317. rules are applied in a particular order or that more rules are
  4318. processed after the first match. Neither is the case! In
  4319. libseccomp <2.4.0 this led to some rules having no effect.
  4320. libseccomp 2.4.0 changed how rules are generated, leading to a
  4321. different ordering, which in turn led to a fatal crash during
  4322. startup. Fixes bug 29819; bugfix on 0.2.5.1-alpha. Patch by
  4323. Peter Gerber.
  4324. - Fix crash when reloading logging configuration while the
  4325. experimental sandbox is enabled. Fixes bug 32841; bugfix on
  4326. 0.4.1.7. Patch by Peter Gerber.
  4327. o Minor bugfixes (correctness checks, backport from 0.4.3.1-alpha):
  4328. - Use GCC/Clang's printf-checking feature to make sure that
  4329. tor_assertf() arguments are correctly typed. Fixes bug 32765;
  4330. bugfix on 0.4.1.1-alpha.
  4331. o Minor bugfixes (logging, crash, backport from 0.4.3.1-alpha):
  4332. - Avoid a possible crash when trying to log a (fatal) assertion
  4333. failure about mismatched magic numbers in configuration objects.
  4334. Fixes bug 32771; bugfix on 0.4.2.1-alpha.
  4335. o Minor bugfixes (testing, backport from 0.4.3.1-alpha):
  4336. - When TOR_DISABLE_PRACTRACKER is set, do not apply it to the
  4337. test_practracker.sh script. Doing so caused a test failure. Fixes
  4338. bug 32705; bugfix on 0.4.2.1-alpha.
  4339. - When TOR_DISABLE_PRACTRACKER is set, log a notice to stderr when
  4340. skipping practracker checks. Fixes bug 32705; bugfix
  4341. on 0.4.2.1-alpha.
  4342. o Minor bugfixes (windows service, backport from 0.4.3.1-alpha):
  4343. - Initialize the publish/subscribe system when running as a windows
  4344. service. Fixes bug 32778; bugfix on 0.4.1.1-alpha.
  4345. o Testing (backport from 0.4.3.1-alpha):
  4346. - Turn off Tor's Sandbox in Chutney jobs, and run those jobs on
  4347. Ubuntu Bionic. Turning off the Sandbox is a work-around, until we
  4348. fix the sandbox errors in 32722. Closes ticket 32240.
  4349. - Re-enable the Travis CI macOS Chutney build, but don't let it
  4350. prevent the Travis job from finishing. (The Travis macOS jobs are
  4351. slow, so we don't want to have it delay the whole CI process.)
  4352. Closes ticket 32629.
  4353. o Testing (continuous integration, backport from 0.4.3.1-alpha):
  4354. - Use zstd in our Travis Linux builds. Closes ticket 32242.
  4355. Changes in version 0.4.1.8 - 2020-01-30
  4356. This release backports several bugfixes from later release series,
  4357. including some that had affected the Linux seccomp2 sandbox or Windows
  4358. services. If you're running with one of those configurations, you'll
  4359. probably want to upgrade; otherwise, you should be fine with your
  4360. current version of 0.4.1.x.
  4361. o Major bugfixes (linux seccomp sandbox, backport from 0.4.3.1-alpha):
  4362. - Correct how we use libseccomp. Particularly, stop assuming that
  4363. rules are applied in a particular order or that more rules are
  4364. processed after the first match. Neither is the case! In
  4365. libseccomp <2.4.0 this led to some rules having no effect.
  4366. libseccomp 2.4.0 changed how rules are generated, leading to a
  4367. different ordering, which in turn led to a fatal crash during
  4368. startup. Fixes bug 29819; bugfix on 0.2.5.1-alpha. Patch by
  4369. Peter Gerber.
  4370. - Fix crash when reloading logging configuration while the
  4371. experimental sandbox is enabled. Fixes bug 32841; bugfix on
  4372. 0.4.1.7. Patch by Peter Gerber.
  4373. o Minor bugfixes (crash, backport form 0.4.2.4-rc):
  4374. - When running Tor with an option like --verify-config or
  4375. --dump-config that does not start the event loop, avoid crashing
  4376. if we try to exit early because of an error. Fixes bug 32407;
  4377. bugfix on 0.3.3.1-alpha.
  4378. o Minor bugfixes (windows service, backport from 0.4.3.1-alpha):
  4379. - Initialize the publish/subscribe system when running as a windows
  4380. service. Fixes bug 32778; bugfix on 0.4.1.1-alpha.
  4381. o Testing (backport from 0.4.3.1-alpha):
  4382. - Turn off Tor's Sandbox in Chutney jobs, and run those jobs on
  4383. Ubuntu Bionic. Turning off the Sandbox is a work-around, until we
  4384. fix the sandbox errors in 32722. Closes ticket 32240.
  4385. - Re-enable the Travis CI macOS Chutney build, but don't let it
  4386. prevent the Travis job from finishing. (The Travis macOS jobs are
  4387. slow, so we don't want to have it delay the whole CI process.)
  4388. Closes ticket 32629.
  4389. o Testing (continuous integration, backport from 0.4.3.1-alpha):
  4390. - Use zstd in our Travis Linux builds. Closes ticket 32242.
  4391. Changes in version 0.4.2.5 - 2019-12-09
  4392. This is the first stable release in the 0.4.2.x series. This series
  4393. improves reliability and stability, and includes several stability and
  4394. correctness improvements for onion services. It also fixes many smaller
  4395. bugs present in previous series.
  4396. Per our support policy, we will support the 0.4.2.x series for nine
  4397. months, or until three months after the release of a stable 0.4.3.x:
  4398. whichever is longer. If you need longer-term support, please stick
  4399. with 0.3.5.x, which will we plan to support until Feb 2022.
  4400. Below are the changes since 0.4.1.4-rc. For a complete list of only
  4401. the changes since 0.4.2.4-rc, see the ChangeLog file.
  4402. o Major features (directory authorities):
  4403. - Directory authorities now reject relays running all currently
  4404. deprecated release series. The currently supported release series
  4405. are: 0.2.9, 0.3.5, 0.4.0, 0.4.1, and 0.4.2. Closes ticket 31549.
  4406. o Major features (onion service v3, denial of service):
  4407. - Add onion service introduction denial of service defenses. Intro
  4408. points can now rate-limit client introduction requests, using
  4409. parameters that can be sent by the service within the
  4410. ESTABLISH_INTRO cell. If the cell extension for this is not used,
  4411. the intro point will honor the consensus parameters. Closes
  4412. ticket 30924.
  4413. o Major bugfixes (circuit build, guard):
  4414. - When considering upgrading circuits from "waiting for guard" to
  4415. "open", always ignore circuits that are marked for close.
  4416. Previously we could end up in the situation where a subsystem is
  4417. notified of a circuit opening, but the circuit is still marked for
  4418. close, leading to undesirable behavior. Fixes bug 30871; bugfix
  4419. on 0.3.0.1-alpha.
  4420. o Major bugfixes (crash, Linux, Android):
  4421. - Tolerate systems (including some Android installations) where
  4422. madvise and MADV_DONTDUMP are available at build-time, but not at
  4423. run time. Previously, these systems would notice a failed syscall
  4424. and abort. Fixes bug 31570; bugfix on 0.4.1.1-alpha.
  4425. - Tolerate systems (including some Linux installations) where
  4426. madvise and/or MADV_DONTFORK are available at build-time, but not
  4427. at run time. Previously, these systems would notice a failed
  4428. syscall and abort. Fixes bug 31696; bugfix on 0.4.1.1-alpha.
  4429. o Major bugfixes (embedded Tor):
  4430. - Avoid a possible crash when restarting Tor in embedded mode and
  4431. enabling a different set of publish/subscribe messages. Fixes bug
  4432. 31898; bugfix on 0.4.1.1-alpha.
  4433. o Major bugfixes (relay):
  4434. - Relays now respect their AccountingMax bandwidth again. When
  4435. relays entered "soft" hibernation (which typically starts when
  4436. we've hit 90% of our AccountingMax), we had stopped checking
  4437. whether we should enter hard hibernation. Soft hibernation refuses
  4438. new connections and new circuits, but the existing circuits can
  4439. continue, meaning that relays could have exceeded their configured
  4440. AccountingMax. Fixes bug 32108; bugfix on 0.4.0.1-alpha.
  4441. o Major bugfixes (torrc parsing):
  4442. - Stop ignoring torrc options after an %include directive, when the
  4443. included directory ends with a file that does not contain any
  4444. config options (but does contain comments or whitespace). Fixes
  4445. bug 31408; bugfix on 0.3.1.1-alpha.
  4446. o Major bugfixes (v3 onion services):
  4447. - Onion services now always use the exact number of intro points
  4448. configured with the HiddenServiceNumIntroductionPoints option (or
  4449. fewer if nodes are excluded). Before, a service could sometimes
  4450. pick more intro points than configured. Fixes bug 31548; bugfix
  4451. on 0.3.2.1-alpha.
  4452. o Minor feature (onion services, control port):
  4453. - The ADD_ONION command's keyword "BEST" now defaults to ED25519-V3
  4454. (v3) onion services. Previously it defaulted to RSA1024 (v2).
  4455. Closes ticket 29669.
  4456. o Minor features (auto-formatting scripts):
  4457. - When annotating C macros, never generate a line that our check-
  4458. spaces script would reject. Closes ticket 31759.
  4459. - When annotating C macros, try to remove cases of double-negation.
  4460. Closes ticket 31779.
  4461. o Minor features (best practices tracker):
  4462. - Our best-practices tracker now integrates with our include-checker
  4463. tool to keep track of how many layering violations we have not yet
  4464. fixed. We hope to reduce this number over time to improve Tor's
  4465. modularity. Closes ticket 31176.
  4466. - Add a TOR_PRACTRACKER_OPTIONS variable for passing arguments to
  4467. practracker from the environment. We may want this for continuous
  4468. integration. Closes ticket 31309.
  4469. - Give a warning rather than an error when a practracker exception
  4470. is violated by a small amount, add a --list-overbroad option to
  4471. practracker that lists exceptions that are stricter than they need
  4472. to be, and provide an environment variable for disabling
  4473. practracker. Closes ticket 30752.
  4474. - Our best-practices tracker now looks at headers as well as C
  4475. files. Closes ticket 31175.
  4476. o Minor features (build system):
  4477. - Make pkg-config use --prefix when cross-compiling, if
  4478. PKG_CONFIG_PATH is not set. Closes ticket 32191.
  4479. - Add --disable-manpage and --disable-html-manual options to
  4480. configure script. This will enable shortening build times by not
  4481. building documentation. Resolves issue 19381.
  4482. o Minor features (compilation):
  4483. - Log a more useful error message when we are compiling and one of
  4484. the compile-time hardening options we have selected can be linked
  4485. but not executed. Closes ticket 27530.
  4486. o Minor features (configuration):
  4487. - The configuration code has been extended to allow splitting
  4488. configuration data across multiple objects. Previously, all
  4489. configuration data needed to be kept in a single object, which
  4490. tended to become bloated. Closes ticket 31240.
  4491. o Minor features (continuous integration):
  4492. - When building on Appveyor and Travis, pass the "-k" flag to make,
  4493. so that we are informed of all compilation failures, not just the
  4494. first one or two. Closes ticket 31372.
  4495. - When running CI builds on Travis, put some random data in
  4496. ~/.torrc, to make sure no tests are reading the Tor configuration
  4497. file from its default location. Resolves issue 30102.
  4498. o Minor features (debugging):
  4499. - Log a nonfatal assertion failure if we encounter a configuration
  4500. line whose command is "CLEAR" but which has a nonempty value. This
  4501. should be impossible, according to the rules of our configuration
  4502. line parsing. Closes ticket 31529.
  4503. o Minor features (geoip):
  4504. - Update geoip and geoip6 to the December 3 2019 Maxmind GeoLite2
  4505. Country database. Closes ticket 32685.
  4506. o Minor features (git hooks):
  4507. - Our pre-commit git hook now checks for a special file before
  4508. running practracker, so that practracker only runs on branches
  4509. that are based on master. Since the pre-push hook calls the pre-
  4510. commit hook, practracker will also only run before pushes of
  4511. branches based on master. Closes ticket 30979.
  4512. o Minor features (git scripts):
  4513. - Add a "--" command-line argument, to separate git-push-all.sh
  4514. script arguments from arguments that are passed through to git
  4515. push. Closes ticket 31314.
  4516. - Add a -r <remote-name> argument to git-push-all.sh, so the script
  4517. can push test branches to a personal remote. Closes ticket 31314.
  4518. - Add a -t <test-branch-prefix> argument to git-merge-forward.sh and
  4519. git-push-all.sh, which makes these scripts create, merge forward,
  4520. and push test branches. Closes ticket 31314.
  4521. - Add a -u argument to git-merge-forward.sh, so that the script can
  4522. re-use existing test branches after a merge failure and fix.
  4523. Closes ticket 31314.
  4524. - Add a TOR_GIT_PUSH env var, which sets the default git push
  4525. command and arguments for git-push-all.sh. Closes ticket 31314.
  4526. - Add a TOR_PUSH_DELAY variable to git-push-all.sh, which makes the
  4527. script push master and maint branches with a delay between each
  4528. branch. These delays trigger the CI jobs in a set order, which
  4529. should show the most likely failures first. Also make pushes
  4530. atomic by default, and make the script pass any command-line
  4531. arguments to git push. Closes ticket 29879.
  4532. - Call the shellcheck script from the pre-commit hook. Closes
  4533. ticket 30967.
  4534. - Skip pushing test branches that are the same as a remote
  4535. maint/release/master branch in git-push-all.sh by default. Add a
  4536. -s argument, so git-push-all.sh can push all test branches. Closes
  4537. ticket 31314.
  4538. o Minor features (IPv6, logging):
  4539. - Log IPv6 addresses as well as IPv4 addresses when describing
  4540. routerinfos, routerstatuses, and nodes. Closes ticket 21003.
  4541. o Minor features (maintenance scripts):
  4542. - Add a Coccinelle script to detect bugs caused by incrementing or
  4543. decrementing a variable inside a call to log_debug(). Since
  4544. log_debug() is a macro whose arguments are conditionally
  4545. evaluated, it is usually an error to do this. One such bug was
  4546. 30628, in which SENDME cells were miscounted by a decrement
  4547. operator inside a log_debug() call. Closes ticket 30743.
  4548. o Minor features (onion service v3):
  4549. - Do not allow single hop clients to fetch or post an HS descriptor
  4550. from an HSDir. Closes ticket 24964.
  4551. o Minor features (onion service):
  4552. - Disallow single-hop clients at the introduction point. We've
  4553. removed Tor2web support a while back and single-hop rendezvous
  4554. attempts are blocked at the relays. This change should remove load
  4555. off the network from spammy clients. Close ticket 24963.
  4556. o Minor features (onion services v3):
  4557. - Assist users who try to setup v2 client authorization in v3 onion
  4558. services by pointing them to the right documentation. Closes
  4559. ticket 28966.
  4560. o Minor features (stem tests):
  4561. - Change "make test-stem" so it only runs the stem tests that use
  4562. tor. This change makes test-stem faster and more reliable. Closes
  4563. ticket 31554.
  4564. o Minor features (testing):
  4565. - When running tests that attempt to look up hostnames, replace the
  4566. libc name lookup functions with ones that do not actually touch
  4567. the network. This way, the tests complete more quickly in the
  4568. presence of a slow or missing DNS resolver. Closes ticket 31841.
  4569. - Add a script to invoke "tor --dump-config" and "tor
  4570. --verify-config" with various configuration options, and see
  4571. whether tor's resulting configuration or error messages are what
  4572. we expect. Use it for integration testing of our +Option and
  4573. /Option flags. Closes ticket 31637.
  4574. - Improve test coverage for our existing configuration parsing and
  4575. management API. Closes ticket 30893.
  4576. - Add integration tests to make sure that practracker gives the
  4577. outputs we expect. Closes ticket 31477.
  4578. - The practracker self-tests are now run as part of the Tor test
  4579. suite. Closes ticket 31304.
  4580. o Minor features (testing, continuous integration):
  4581. - Disable all but one Travis CI macOS build, to mitigate slow
  4582. scheduling of Travis macOS jobs. Closes ticket 32177.
  4583. - Run the chutney IPv6 networks as part of Travis CI. Closes
  4584. ticket 30860.
  4585. - Simplify the Travis CI build matrix, and optimise for build time.
  4586. Closes ticket 31859.
  4587. - Use Windows Server 2019 instead of Windows Server 2016 in our
  4588. Appveyor builds. Closes ticket 32086.
  4589. o Minor features (token bucket):
  4590. - Implement a generic token bucket that uses a single counter, for
  4591. use in anti-DoS onion service work. Closes ticket 30687.
  4592. o Minor bugfixes (Appveyor continuous integration):
  4593. - Avoid spurious errors when Appveyor CI fails before the install
  4594. step. Fixes bug 31884; bugfix on 0.3.4.2-alpha.
  4595. o Minor bugfixes (best practices tracker):
  4596. - Fix a few issues in the best-practices script, including tests,
  4597. tab tolerance, error reporting, and directory-exclusion logic.
  4598. Fixes bug 29746; bugfix on 0.4.1.1-alpha.
  4599. - When running check-best-practices, only consider files in the src
  4600. subdirectory. Previously we had recursively considered all
  4601. subdirectories, which made us get confused by the temporary
  4602. directories made by "make distcheck". Fixes bug 31578; bugfix
  4603. on 0.4.1.1-alpha.
  4604. o Minor bugfixes (build system):
  4605. - Interpret "--disable-module-dirauth=no" correctly. Fixes bug
  4606. 32124; bugfix on 0.3.4.1-alpha.
  4607. - Interpret "--with-tcmalloc=no" correctly. Fixes bug 32124; bugfix
  4608. on 0.2.0.20-rc.
  4609. - Stop failing when jemalloc is requested, but tcmalloc is not
  4610. found. Fixes bug 32124; bugfix on 0.3.5.1-alpha.
  4611. - When pkg-config is not installed, or a library that depends on
  4612. pkg-config is not found, tell the user what to do to fix the
  4613. problem. Fixes bug 31922; bugfix on 0.3.1.1-alpha.
  4614. - Do not include the deprecated <sys/sysctl.h> on Linux or Windows
  4615. systems. Fixes bug 31673; bugfix on 0.2.5.4-alpha.
  4616. o Minor bugfixes (chutney, makefiles, documentation):
  4617. - "make test-network-all" now shows the warnings from each test-
  4618. network.sh run on the console, so developers see new warnings
  4619. early. We've also improved the documentation for this feature, and
  4620. renamed a Makefile variable so the code is self-documenting. Fixes
  4621. bug 30455; bugfix on 0.3.0.4-rc.
  4622. o Minor bugfixes (client, onion service v3):
  4623. - Fix a BUG() assertion that occurs within a very small race window
  4624. between when a client intro circuit opens and when its descriptor
  4625. gets cleaned up from the cache. The circuit is now closed early,
  4626. which will trigger a re-fetch of the descriptor and continue the
  4627. connection. Fixes bug 28970; bugfix on 0.3.2.1-alpha.
  4628. o Minor bugfixes (code quality):
  4629. - Fix "make check-includes" so it runs correctly on out-of-tree
  4630. builds. Fixes bug 31335; bugfix on 0.3.5.1-alpha.
  4631. o Minor bugfixes (compilation):
  4632. - Add more stub functions to fix compilation on Android with link-
  4633. time optimization when --disable-module-dirauth is used.
  4634. Previously, these compilation settings would make the compiler
  4635. look for functions that didn't exist. Fixes bug 31552; bugfix
  4636. on 0.4.1.1-alpha.
  4637. - Suppress spurious float-conversion warnings from GCC when calling
  4638. floating-point classifier functions on FreeBSD. Fixes part of bug
  4639. 31687; bugfix on 0.3.1.5-alpha.
  4640. o Minor bugfixes (configuration):
  4641. - Invalid floating-point values in the configuration file are now
  4642. treated as errors in the configuration. Previously, they were
  4643. ignored and treated as zero. Fixes bug 31475; bugfix on 0.0.1.
  4644. o Minor bugfixes (connections):
  4645. - Avoid trying to read data from closed connections, which can cause
  4646. needless loops in Libevent and infinite loops in Shadow. Fixes bug
  4647. 30344; bugfix on 0.1.1.1-alpha.
  4648. o Minor bugfixes (controller protocol):
  4649. - Fix the MAPADDRESS controller command to accept one or more
  4650. arguments. Previously, it required two or more arguments, and
  4651. ignored the first. Fixes bug 31772; bugfix on 0.4.1.1-alpha.
  4652. o Minor bugfixes (coverity):
  4653. - Add an assertion when parsing a BEGIN cell so that coverity can be
  4654. sure that we are not about to dereference a NULL address. Fixes
  4655. bug 31026; bugfix on 0.2.4.7-alpha. This is CID 1447296.
  4656. - In our siphash implementation, when building for coverity, use
  4657. memcpy in place of a switch statement, so that coverity can tell
  4658. we are not accessing out-of-bounds memory. Fixes bug 31025; bugfix
  4659. on 0.2.8.1-alpha. This is tracked as CID 1447293 and 1447295.
  4660. - Fix several coverity warnings from our unit tests. Fixes bug
  4661. 31030; bugfix on 0.2.4.1-alpha, 0.3.2.1-alpha, and 0.4.0.1-alpha.
  4662. o Minor bugfixes (crash):
  4663. - When running Tor with an option like --verify-config or
  4664. --dump-config that does not start the event loop, avoid crashing
  4665. if we try to exit early because of an error. Fixes bug 32407;
  4666. bugfix on 0.3.3.1-alpha.
  4667. o Minor bugfixes (developer tooling):
  4668. - Only log git script changes in the post-merge script when the
  4669. merge was to the master branch. Fixes bug 31040; bugfix
  4670. on 0.4.1.1-alpha.
  4671. o Minor bugfixes (directory authorities):
  4672. - Return a distinct status when formatting annotations fails. Fixes
  4673. bug 30780; bugfix on 0.2.0.8-alpha.
  4674. o Minor bugfixes (error handling):
  4675. - Always lock the backtrace buffer before it is used. Fixes bug
  4676. 31734; bugfix on 0.2.5.3-alpha.
  4677. - On abort, try harder to flush the output buffers of log messages.
  4678. On some platforms (macOS), log messages could be discarded when
  4679. the process terminates. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
  4680. - Report the tor version whenever an assertion fails. Previously, we
  4681. only reported the Tor version on some crashes, and some non-fatal
  4682. assertions. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
  4683. - When tor aborts due to an error, close log file descriptors before
  4684. aborting. Closing the logs makes some OSes flush log file buffers,
  4685. rather than deleting buffered log lines. Fixes bug 31594; bugfix
  4686. on 0.2.5.2-alpha.
  4687. o Minor bugfixes (FreeBSD, PF-based proxy, IPv6):
  4688. - When extracting an IPv6 address from a PF-based proxy, verify that
  4689. we are actually configured to receive an IPv6 address, and log an
  4690. internal error if not. Fixes part of bug 31687; bugfix
  4691. on 0.2.3.4-alpha.
  4692. o Minor bugfixes (git hooks):
  4693. - Remove a duplicate call to practracker from the pre-push hook. The
  4694. pre-push hook already calls the pre-commit hook, which calls
  4695. practracker. Fixes bug 31462; bugfix on 0.4.1.1-alpha.
  4696. o Minor bugfixes (git scripts):
  4697. - Stop hard-coding the bash path in the git scripts. Some OSes don't
  4698. have bash in /usr/bin, others have an ancient bash at this path.
  4699. Fixes bug 30840; bugfix on 0.4.0.1-alpha.
  4700. - Stop hard-coding the tor master branch name and worktree path in
  4701. the git scripts. Fixes bug 30841; bugfix on 0.4.0.1-alpha.
  4702. - Allow git-push-all.sh to be run from any directory. Previously,
  4703. the script only worked if run from an upstream worktree directory.
  4704. Closes ticket 31678.
  4705. o Minor bugfixes (guards):
  4706. - When tor is missing descriptors for some primary entry guards,
  4707. make the log message less alarming. It's normal for descriptors to
  4708. expire, as long as tor fetches new ones soon after. Fixes bug
  4709. 31657; bugfix on 0.3.3.1-alpha.
  4710. o Minor bugfixes (ipv6):
  4711. - Check for private IPv6 addresses alongside their IPv4 equivalents
  4712. when authorities check descriptors. Previously, we only checked
  4713. for private IPv4 addresses. Fixes bug 31088; bugfix on
  4714. 0.2.3.21-rc. Patch by Neel Chauhan.
  4715. - When parsing microdescriptors, we should check the IPv6 exit
  4716. policy alongside IPv4. Previously, we checked both exit policies
  4717. for only router info structures, while microdescriptors were
  4718. IPv4-only. Fixes bug 27284; bugfix on 0.2.3.1-alpha. Patch by
  4719. Neel Chauhan.
  4720. o Minor bugfixes (logging):
  4721. - Add a missing check for HAVE_PTHREAD_H, because the backtrace code
  4722. uses mutexes. Fixes bug 31614; bugfix on 0.2.5.2-alpha.
  4723. - Disable backtrace signal handlers when shutting down tor. Fixes
  4724. bug 31614; bugfix on 0.2.5.2-alpha.
  4725. - Rate-limit the logging message about the obsolete .exit
  4726. notation. Previously, there was no limit on this warning, which
  4727. could potentially be triggered many times by a hostile website.
  4728. Fixes bug 31466; bugfix on 0.2.2.1-alpha.
  4729. - When initialising log domain masks, only set known log domains.
  4730. Fixes bug 31854; bugfix on 0.2.1.1-alpha.
  4731. - Change log level of message "Hash of session info was not as
  4732. expected" to LOG_PROTOCOL_WARN. Fixes bug 12399; bugfix
  4733. on 0.1.1.10-alpha.
  4734. - Fix a code issue that would have broken our parsing of log domains
  4735. as soon as we had 33 of them. Fortunately, we still only have 29.
  4736. Fixes bug 31451; bugfix on 0.4.1.4-rc.
  4737. o Minor bugfixes (logging, protocol violations):
  4738. - Do not log a nonfatal assertion failure when receiving a VERSIONS
  4739. cell on a connection using the obsolete v1 link protocol. Log a
  4740. protocol_warn instead. Fixes bug 31107; bugfix on 0.2.4.4-alpha.
  4741. o Minor bugfixes (mainloop, periodic events, in-process API):
  4742. - Reset the periodic events' "enabled" flag when Tor is shut down
  4743. cleanly. Previously, this flag was left on, which caused periodic
  4744. events not to be re-enabled when Tor was relaunched in-process
  4745. with tor_api.h after a shutdown. Fixes bug 32058; bugfix
  4746. on 0.3.3.1-alpha.
  4747. o Minor bugfixes (memory management):
  4748. - Stop leaking a small amount of memory in nt_service_install(), in
  4749. unreachable code. Fixes bug 30799; bugfix on 0.2.0.7-alpha. Patch
  4750. by Xiaoyin Liu.
  4751. o Minor bugfixes (modules):
  4752. - Explain what the optional Directory Authority module is, and what
  4753. happens when it is disabled. Fixes bug 31825; bugfix
  4754. on 0.3.4.1-alpha.
  4755. o Minor bugfixes (multithreading):
  4756. - Avoid some undefined behaviour when freeing mutexes. Fixes bug
  4757. 31736; bugfix on 0.0.7.
  4758. o Minor bugfixes (networking, IP addresses):
  4759. - When parsing addresses via Tor's internal DNS lookup API, reject
  4760. IPv4 addresses in square brackets, and accept IPv6 addresses in
  4761. square brackets. This change completes the work started in 23082,
  4762. making address parsing consistent between tor's internal DNS
  4763. lookup and address parsing APIs. Fixes bug 30721; bugfix
  4764. on 0.2.1.5-alpha.
  4765. - When parsing addresses via Tor's internal address:port parsing and
  4766. DNS lookup APIs, require IPv6 addresses with ports to have square
  4767. brackets. But allow IPv6 addresses without ports, whether or not
  4768. they have square brackets. Fixes bug 30721; bugfix
  4769. on 0.2.1.5-alpha.
  4770. o Minor bugfixes (onion service v3):
  4771. - When purging the client descriptor cache, close any introduction
  4772. point circuits associated with purged cache entries. This avoids
  4773. picking those circuits later when connecting to the same
  4774. introduction points. Fixes bug 30921; bugfix on 0.3.2.1-alpha.
  4775. o Minor bugfixes (onion services):
  4776. - In the hs_ident_circuit_t data structure, remove the unused field
  4777. circuit_type and the respective argument in hs_ident_circuit_new().
  4778. This field was set by clients (for introduction) and services (for
  4779. introduction and rendezvous) but was never used afterwards. Fixes
  4780. bug 31490; bugfix on 0.3.2.1-alpha. Patch by Neel Chauhan.
  4781. o Minor bugfixes (operator tools):
  4782. - Make tor-print-ed-signing-cert(1) print certificate expiration
  4783. date in RFC 1123 and UNIX timestamp formats, to make output
  4784. machine readable. Fixes bug 31012; bugfix on 0.3.5.1-alpha.
  4785. o Minor bugfixes (process management):
  4786. - Remove overly strict assertions that triggered when a pluggable
  4787. transport failed to launch. Fixes bug 31091; bugfix
  4788. on 0.4.0.1-alpha.
  4789. - Remove an assertion in the Unix process backend. This assertion
  4790. would trigger when we failed to find the executable for a child
  4791. process. Fixes bug 31810; bugfix on 0.4.0.1-alpha.
  4792. o Minor bugfixes (relay):
  4793. - Avoid crashing when starting with a corrupt keys directory where
  4794. the old ntor key and the new ntor key are identical. Fixes bug
  4795. 30916; bugfix on 0.2.4.8-alpha.
  4796. o Minor bugfixes (rust):
  4797. - Correctly exclude a redundant rust build job in Travis. Fixes bug
  4798. 31463; bugfix on 0.3.5.4-alpha.
  4799. - Raise the minimum rustc version to 1.31.0, as checked by configure
  4800. and CI. Fixes bug 31442; bugfix on 0.3.5.4-alpha.
  4801. o Minor bugfixes (sendme, code structure):
  4802. - Rename the trunnel SENDME file definition from sendme.trunnel to
  4803. sendme_cell.trunnel to avoid having twice sendme.{c|h} in the
  4804. repository. Fixes bug 30769; bugfix on 0.4.1.1-alpha.
  4805. o Minor bugfixes (statistics):
  4806. - Stop removing the ed25519 signature if the extra info file is too
  4807. big. If the signature data was removed, but the keyword was kept,
  4808. this could result in an unparseable extra info file. Fixes bug
  4809. 30958; bugfix on 0.2.7.2-alpha.
  4810. o Minor bugfixes (subsystems):
  4811. - Make the subsystem init order match the subsystem module
  4812. dependencies. Call windows process security APIs as early as
  4813. possible. Initialize logging before network and time, so that
  4814. network and time can use logging. Fixes bug 31615; bugfix
  4815. on 0.4.0.1-alpha.
  4816. o Minor bugfixes (testing):
  4817. - Avoid intermittent test failures due to a test that had relied on
  4818. inconsistent timing sources. Fixes bug 31995; bugfix
  4819. on 0.3.1.3-alpha.
  4820. - When testing port rebinding, don't busy-wait for tor to log.
  4821. Instead, actually sleep for a short time before polling again.
  4822. Also improve the formatting of control commands and log messages.
  4823. Fixes bug 31837; bugfix on 0.3.5.1-alpha.
  4824. - Teach the util/socketpair_ersatz test to work correctly when we
  4825. have no network stack configured. Fixes bug 30804; bugfix
  4826. on 0.2.5.1-alpha.
  4827. o Minor bugfixes (tests, SunOS):
  4828. - Avoid a map_anon_nofork test failure due to a signed/unsigned
  4829. integer comparison. Fixes bug 31897; bugfix on 0.4.1.1-alpha.
  4830. o Minor bugfixes (tls, logging):
  4831. - Log bugs about the TLS read buffer's length only once, rather than
  4832. filling the logs with similar warnings. Fixes bug 31939; bugfix
  4833. on 0.3.0.4-rc.
  4834. o Minor bugfixes (v2 single onion services):
  4835. - Always retry v2 single onion service intro and rend circuits with
  4836. a 3-hop path. Previously, v2 single onion services used a 3-hop
  4837. path when rendezvous circuits were retried after a remote or
  4838. delayed failure, but a 1-hop path for immediate retries. Fixes bug
  4839. 23818; bugfix on 0.2.9.3-alpha.
  4840. o Minor bugfixes (v3 onion services):
  4841. - When cleaning up intro circuits for a v3 onion service, don't
  4842. remove circuits that have an established or pending circuit, even
  4843. if they ran out of retries. This way, we don't remove a circuit on
  4844. its last retry. Fixes bug 31652; bugfix on 0.3.2.1-alpha.
  4845. o Minor bugfixes (v3 single onion services):
  4846. - Always retry v3 single onion service intro and rend circuits with
  4847. a 3-hop path. Previously, v3 single onion services used a 3-hop
  4848. path when rend circuits were retried after a remote or delayed
  4849. failure, but a 1-hop path for immediate retries. Fixes bug 23818;
  4850. bugfix on 0.3.2.1-alpha.
  4851. - Make v3 single onion services fall back to a 3-hop intro, when all
  4852. intro points are unreachable via a 1-hop path. Previously, v3
  4853. single onion services failed when all intro nodes were unreachable
  4854. via a 1-hop path. Fixes bug 23507; bugfix on 0.3.2.1-alpha.
  4855. o Code simplification and refactoring:
  4856. - Refactor connection_control_process_inbuf() to reduce the size of
  4857. a practracker exception. Closes ticket 31840.
  4858. - Refactor the microdescs_parse_from_string() function into smaller
  4859. pieces, for better comprehensibility. Closes ticket 31675.
  4860. - Use SEVERITY_MASK_IDX() to find the LOG_* mask indexes in the unit
  4861. tests and fuzzers, rather than using hard-coded values. Closes
  4862. ticket 31334.
  4863. - Interface for function `decrypt_desc_layer` cleaned up. Closes
  4864. ticket 31589.
  4865. o Documentation:
  4866. - Correct the description of "GuardLifetime". Fixes bug 31189;
  4867. bugfix on 0.3.0.1-alpha.
  4868. - Make clear in the man page, in both the bandwidth section and the
  4869. AccountingMax section, that Tor counts in powers of two, not
  4870. powers of ten: 1 GByte is 1024*1024*1024 bytes, not one billion
  4871. bytes. Resolves ticket 32106.
  4872. - Document the signal-safe logging behaviour in the tor man page.
  4873. Also add some comments to the relevant functions. Closes
  4874. ticket 31839.
  4875. - Explain why we can't destroy the backtrace buffer mutex. Explain
  4876. why we don't need to destroy the log mutex. Closes ticket 31736.
  4877. - The Tor source code repository now includes a (somewhat dated)
  4878. description of Tor's modular architecture, in doc/HACKING/design.
  4879. This is based on the old "tor-guts.git" repository, which we are
  4880. adopting and superseding. Closes ticket 31849.
  4881. - Improve documentation in circuit padding subsystem. Patch by
  4882. Tobias Pulls. Closes ticket 31113.
  4883. - Include an example usage for IPv6 ORPort in our sample torrc.
  4884. Closes ticket 31320; patch from Ali Raheem.
  4885. - Use RFC 2397 data URL scheme to embed an image into tor-exit-
  4886. notice.html so that operators no longer have to host it
  4887. themselves. Closes ticket 31089.
  4888. o Removed features:
  4889. - No longer include recommended package digests in votes as detailed
  4890. in proposal 301. The RecommendedPackages torrc option is
  4891. deprecated and will no longer have any effect. "package" lines
  4892. will still be considered when computing consensuses for consensus
  4893. methods that include them. (This change has no effect on the list
  4894. of recommended Tor versions, which is still in use.) Closes
  4895. ticket 29738.
  4896. - Remove torctl.in from contrib/dist directory. Resolves
  4897. ticket 30550.
  4898. o Testing:
  4899. - Require C99 standards-conforming code in Travis CI, but allow GNU
  4900. gcc extensions. Also activates clang's -Wtypedef-redefinition
  4901. warnings. Build some jobs with -std=gnu99, and some jobs without.
  4902. Closes ticket 32500.
  4903. - Run shellcheck for all non-third-party shell scripts that are
  4904. shipped with Tor. Closes ticket 29533.
  4905. - When checking shell scripts, ignore any user-created directories.
  4906. Closes ticket 30967.
  4907. o Code simplification and refactoring (config handling):
  4908. - Extract our variable manipulation code from confparse.c to a new
  4909. lower-level typedvar.h module. Closes ticket 30864.
  4910. - Lower another layer of object management from confparse.c to a
  4911. more general tool. Now typed structure members are accessible via
  4912. an abstract type. Implements ticket 30914.
  4913. - Move our backend logic for working with configuration and state
  4914. files into a lower-level library, since it no longer depends on
  4915. any tor-specific functionality. Closes ticket 31626.
  4916. - Numerous simplifications in configuration-handling logic: remove
  4917. duplicated macro definitions, replace magical names with flags,
  4918. and refactor "TestingTorNetwork" to use the same default-option
  4919. logic as the rest of Tor. Closes ticket 30935.
  4920. - Replace our ad-hoc set of flags for configuration variables and
  4921. configuration variable types with fine-grained orthogonal flags
  4922. corresponding to the actual behavior we want. Closes ticket 31625.
  4923. o Code simplification and refactoring (misc):
  4924. - Eliminate some uses of lower-level control reply abstractions,
  4925. primarily in the onion_helper functions. Closes ticket 30889.
  4926. - Rework bootstrap tracking to use the new publish-subscribe
  4927. subsystem. Closes ticket 29976.
  4928. - Rewrite format_node_description() and router_get_verbose_nickname()
  4929. to use strlcpy() and strlcat(). The previous implementation used
  4930. memcpy() and pointer arithmetic, which was error-prone. Closes
  4931. ticket 31545. This is CID 1452819.
  4932. - Split extrainfo_dump_to_string() into smaller functions. Closes
  4933. ticket 30956.
  4934. - Use the ptrdiff_t type consistently for expressing variable
  4935. offsets and pointer differences. Previously we incorrectly (but
  4936. harmlessly) used int and sometimes off_t for these cases. Closes
  4937. ticket 31532.
  4938. - Use the subsystems mechanism to manage the main event loop code.
  4939. Closes ticket 30806.
  4940. - Various simplifications and minor improvements to the circuit
  4941. padding machines. Patch by Tobias Pulls. Closes tickets 31112
  4942. and 31098.
  4943. o Documentation (hard-coded directories):
  4944. - Improve the documentation for the DirAuthority and FallbackDir
  4945. torrc options. Closes ticket 30955.
  4946. o Documentation (tor.1 man page):
  4947. - Fix typo in tor.1 man page: the option is "--help", not "-help".
  4948. Fixes bug 31008; bugfix on 0.2.2.9-alpha.
  4949. o Testing (continuous integration):
  4950. - Use Ubuntu Bionic images for our Travis CI builds, so we can get a
  4951. recent version of coccinelle. But leave chutney on Ubuntu Trusty,
  4952. until we can fix some Bionic permissions issues (see ticket
  4953. 32240). Related to ticket 31919.
  4954. - Install the mingw OpenSSL package in Appveyor. This makes sure
  4955. that the OpenSSL headers and libraries match in Tor's Appveyor
  4956. builds. (This bug was triggered by an Appveyor image update.)
  4957. Fixes bug 32449; bugfix on 0.3.5.6-rc.
  4958. - In Travis, use Xcode 11.2 on macOS 10.14. Closes ticket 32241.
  4959. Changes in version 0.4.1.7 - 2019-12-09
  4960. This release backports several bugfixes to improve stability and
  4961. correctness. Anyone experiencing build problems or crashes with 0.4.1.6,
  4962. including all relays relying on AccountingMax, should upgrade.
  4963. o Major features (directory authorities, backport from 0.4.2.2-alpha):
  4964. - Directory authorities now reject relays running all currently
  4965. deprecated release series. The currently supported release series
  4966. are: 0.2.9, 0.3.5, 0.4.0, 0.4.1, and 0.4.2. Closes ticket 31549.
  4967. o Major bugfixes (embedded Tor, backport from 0.4.2.2-alpha):
  4968. - Avoid a possible crash when restarting Tor in embedded mode and
  4969. enabling a different set of publish/subscribe messages. Fixes bug
  4970. 31898; bugfix on 0.4.1.1-alpha.
  4971. o Major bugfixes (relay, backport from 0.4.2.3-alpha):
  4972. - Relays now respect their AccountingMax bandwidth again. When
  4973. relays entered "soft" hibernation (which typically starts when
  4974. we've hit 90% of our AccountingMax), we had stopped checking
  4975. whether we should enter hard hibernation. Soft hibernation refuses
  4976. new connections and new circuits, but the existing circuits can
  4977. continue, meaning that relays could have exceeded their configured
  4978. AccountingMax. Fixes bug 32108; bugfix on 0.4.0.1-alpha.
  4979. o Major bugfixes (torrc parsing, backport from 0.4.2.2-alpha):
  4980. - Stop ignoring torrc options after an %include directive, when the
  4981. included directory ends with a file that does not contain any
  4982. config options (but does contain comments or whitespace). Fixes
  4983. bug 31408; bugfix on 0.3.1.1-alpha.
  4984. o Major bugfixes (v3 onion services, backport from 0.4.2.3-alpha):
  4985. - Onion services now always use the exact number of intro points
  4986. configured with the HiddenServiceNumIntroductionPoints option (or
  4987. fewer if nodes are excluded). Before, a service could sometimes
  4988. pick more intro points than configured. Fixes bug 31548; bugfix
  4989. on 0.3.2.1-alpha.
  4990. o Minor features (continuous integration, backport from 0.4.2.2-alpha):
  4991. - When building on Appveyor and Travis, pass the "-k" flag to make,
  4992. so that we are informed of all compilation failures, not just the
  4993. first one or two. Closes ticket 31372.
  4994. o Minor features (geoip, backport from 0.4.2.5):
  4995. - Update geoip and geoip6 to the December 3 2019 Maxmind GeoLite2
  4996. Country database. Closes ticket 32685.
  4997. o Minor bugfixes (Appveyor CI, backport from 0.4.2.2-alpha):
  4998. - Avoid spurious errors when Appveyor CI fails before the install step.
  4999. Fixes bug 31884; bugfix on 0.3.4.2-alpha.
  5000. o Minor bugfixes (client, onion service v3, backport from 0.4.2.4-rc):
  5001. - Fix a BUG() assertion that occurs within a very small race window
  5002. between when a client intro circuit opens and when its descriptor
  5003. gets cleaned up from the cache. The circuit is now closed early,
  5004. which will trigger a re-fetch of the descriptor and continue the
  5005. connection. Fixes bug 28970; bugfix on 0.3.2.1-alpha.
  5006. o Minor bugfixes (connections, backport from 0.4.2.3-rc):
  5007. - Avoid trying to read data from closed connections, which can cause
  5008. needless loops in Libevent and infinite loops in Shadow. Fixes bug
  5009. 30344; bugfix on 0.1.1.1-alpha.
  5010. o Minor bugfixes (error handling, backport from 0.4.2.1-alpha):
  5011. - On abort, try harder to flush the output buffers of log messages.
  5012. On some platforms (macOS), log messages could be discarded when
  5013. the process terminates. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
  5014. - Report the tor version whenever an assertion fails. Previously, we
  5015. only reported the Tor version on some crashes, and some non-fatal
  5016. assertions. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
  5017. - When tor aborts due to an error, close log file descriptors before
  5018. aborting. Closing the logs makes some OSes flush log file buffers,
  5019. rather than deleting buffered log lines. Fixes bug 31594; bugfix
  5020. on 0.2.5.2-alpha.
  5021. o Minor bugfixes (logging, backport from 0.4.2.2-alpha):
  5022. - Add a missing check for HAVE_PTHREAD_H, because the backtrace code
  5023. uses mutexes. Fixes bug 31614; bugfix on 0.2.5.2-alpha.
  5024. - Disable backtrace signal handlers when shutting down tor. Fixes
  5025. bug 31614; bugfix on 0.2.5.2-alpha.
  5026. - Rate-limit the logging message about the obsolete .exit
  5027. notation. Previously, there was no limit on this warning, which
  5028. could potentially be triggered many times by a hostile website.
  5029. Fixes bug 31466; bugfix on 0.2.2.1-alpha.
  5030. o Minor bugfixes (logging, protocol violations, backport from 0.4.2.2-alpha):
  5031. - Do not log a nonfatal assertion failure when receiving a VERSIONS
  5032. cell on a connection using the obsolete v1 link protocol. Log a
  5033. protocol_warn instead. Fixes bug 31107; bugfix on 0.2.4.4-alpha.
  5034. o Minor bugfixes (mainloop, periodic events, in-process API, backport from 0.4.2.3-alpha):
  5035. - Reset the periodic events' "enabled" flag when Tor is shut down
  5036. cleanly. Previously, this flag was left on, which caused periodic
  5037. events not to be re-enabled when Tor was relaunched in-process
  5038. with tor_api.h after a shutdown. Fixes bug 32058; bugfix
  5039. on 0.3.3.1-alpha.
  5040. o Minor bugfixes (multithreading, backport from 0.4.2.2-alpha):
  5041. - Avoid some undefined behaviour when freeing mutexes. Fixes bug
  5042. 31736; bugfix on 0.0.7.
  5043. o Minor bugfixes (process management, backport from 0.4.2.3-alpha):
  5044. - Remove overly strict assertions that triggered when a pluggable
  5045. transport failed to launch. Fixes bug 31091; bugfix
  5046. on 0.4.0.1-alpha.
  5047. - Remove an assertion in the Unix process backend. This assertion
  5048. would trigger when we failed to find the executable for a child
  5049. process. Fixes bug 31810; bugfix on 0.4.0.1-alpha.
  5050. o Minor bugfixes (relay, backport from 0.4.2.2-alpha):
  5051. - Avoid crashing when starting with a corrupt keys directory where
  5052. the old ntor key and the new ntor key are identical. Fixes bug
  5053. 30916; bugfix on 0.2.4.8-alpha.
  5054. o Minor bugfixes (testing, backport from 0.4.2.3-alpha):
  5055. - When testing port rebinding, don't busy-wait for tor to log.
  5056. Instead, actually sleep for a short time before polling again.
  5057. Also improve the formatting of control commands and log messages.
  5058. Fixes bug 31837; bugfix on 0.3.5.1-alpha.
  5059. o Minor bugfixes (tests, SunOS, backport from 0.4.2.2-alpha):
  5060. - Avoid a map_anon_nofork test failure due to a signed/unsigned
  5061. integer comparison. Fixes bug 31897; bugfix on 0.4.1.1-alpha.
  5062. o Minor bugfixes (tls, logging, backport from 0.4.2.3-alpha):
  5063. - Log bugs about the TLS read buffer's length only once, rather than
  5064. filling the logs with similar warnings. Fixes bug 31939; bugfix
  5065. on 0.3.0.4-rc.
  5066. o Documentation (backport from 0.4.2.2-alpha):
  5067. - Explain why we can't destroy the backtrace buffer mutex. Explain
  5068. why we don't need to destroy the log mutex. Closes ticket 31736.
  5069. o Testing (continuous integration, backport from 0.4.2.3-alpha):
  5070. - Disable all but one Travis CI macOS build, to mitigate slow
  5071. scheduling of Travis macOS jobs. Closes ticket 32177.
  5072. - Run the chutney IPv6 networks as part of Travis CI. Closes
  5073. ticket 30860.
  5074. - Simplify the Travis CI build matrix, and optimise for build time.
  5075. Closes ticket 31859.
  5076. - Use Windows Server 2019 instead of Windows Server 2016 in our
  5077. Appveyor builds. Closes ticket 32086.
  5078. o Testing (continuous integration, backport from 0.4.2.4-rc):
  5079. - In Travis, use Xcode 11.2 on macOS 10.14. Closes ticket 32241.
  5080. - Use Ubuntu Bionic images for our Travis CI builds, so we can get a
  5081. recent version of coccinelle. But leave chutney on Ubuntu Trusty,
  5082. until we can fix some Bionic permissions issues (see ticket
  5083. 32240). Related to ticket 31919.
  5084. - Install the mingw OpenSSL package in Appveyor. This makes sure
  5085. that the OpenSSL headers and libraries match in Tor's Appveyor
  5086. builds. (This bug was triggered by an Appveyor image update.)
  5087. Fixes bug 32449; bugfix on 0.3.5.6-rc.
  5088. o Testing (continuous integration, backport from 0.4.2.5):
  5089. - Require C99 standards-conforming code in Travis CI, but allow GNU gcc
  5090. extensions. Also activates clang's -Wtypedef-redefinition warnings.
  5091. Build some jobs with -std=gnu99, and some jobs without.
  5092. Closes ticket 32500.
  5093. Changes in version 0.4.0.6 - 2019-12-09
  5094. This is the second stable release in the 0.4.0.x series. This release
  5095. backports several bugfixes to improve stability and correctness. Anyone
  5096. experiencing build problems or crashes with 0.4.0.5, including all relays
  5097. relying on AccountingMax, should upgrade.
  5098. Note that, per our support policy, support for the 0.4.0.x series will end
  5099. on 2 Feb 2020. Anyone still running 0.4.0.x should plan to upgrade to the
  5100. latest stable release, or downgrade to 0.3.5.x, which will get long-term
  5101. support until 1 Feb 2022.
  5102. o Directory authority changes (backport from 0.4.1.5):
  5103. - The directory authority "dizum" has a new IP address. Closes
  5104. ticket 31406.
  5105. o Major bugfixes (bridges, backport from 0.4.1.2-alpha):
  5106. - Consider our directory information to have changed when our list
  5107. of bridges changes. Previously, Tor would not re-compute the
  5108. status of its directory information when bridges changed, and
  5109. therefore would not realize that it was no longer able to build
  5110. circuits. Fixes part of bug 29875.
  5111. - Do not count previously configured working bridges towards our
  5112. total of working bridges. Previously, when Tor's list of bridges
  5113. changed, it would think that the old bridges were still usable,
  5114. and delay fetching router descriptors for the new ones. Fixes part
  5115. of bug 29875; bugfix on 0.3.0.1-alpha.
  5116. o Major bugfixes (circuit build, guard, backport from 0.4.1.4-rc):
  5117. - When considering upgrading circuits from "waiting for guard" to
  5118. "open", always ignore circuits that are marked for close. Otherwise,
  5119. we can end up in the situation where a subsystem is notified that
  5120. a closing circuit has just opened, leading to undesirable
  5121. behavior. Fixes bug 30871; bugfix on 0.3.0.1-alpha.
  5122. o Major bugfixes (Onion service reachability, backport from 0.4.1.3-alpha):
  5123. - Properly clean up the introduction point map when circuits change
  5124. purpose from onion service circuits to pathbias, measurement, or
  5125. other circuit types. This should fix some service-side instances
  5126. of introduction point failure. Fixes bug 29034; bugfix
  5127. on 0.3.2.1-alpha.
  5128. o Major bugfixes (onion service v3, backport from 0.4.1.1-alpha):
  5129. - Fix an unreachable bug in which an introduction point could try to
  5130. send an INTRODUCE_ACK with a status code that Trunnel would refuse
  5131. to encode, leading the relay to assert(). We've consolidated the
  5132. ABI values into Trunnel now. Fixes bug 30454; bugfix
  5133. on 0.3.0.1-alpha.
  5134. - Clients can now handle unknown status codes from INTRODUCE_ACK
  5135. cells. (The NACK behavior will stay the same.) This will allow us
  5136. to extend status codes in the future without breaking the normal
  5137. client behavior. Fixes another part of bug 30454; bugfix
  5138. on 0.3.0.1-alpha.
  5139. o Major bugfixes (relay, backport from 0.4.2.3-alpha):
  5140. - Relays now respect their AccountingMax bandwidth again. When
  5141. relays entered "soft" hibernation (which typically starts when
  5142. we've hit 90% of our AccountingMax), we had stopped checking
  5143. whether we should enter hard hibernation. Soft hibernation refuses
  5144. new connections and new circuits, but the existing circuits can
  5145. continue, meaning that relays could have exceeded their configured
  5146. AccountingMax. Fixes bug 32108; bugfix on 0.4.0.1-alpha.
  5147. o Major bugfixes (torrc parsing, backport from 0.4.2.2-alpha):
  5148. - Stop ignoring torrc options after an %include directive, when the
  5149. included directory ends with a file that does not contain any
  5150. config options (but does contain comments or whitespace). Fixes
  5151. bug 31408; bugfix on 0.3.1.1-alpha.
  5152. o Major bugfixes (v3 onion services, backport from 0.4.2.3-alpha):
  5153. - Onion services now always use the exact number of intro points
  5154. configured with the HiddenServiceNumIntroductionPoints option (or
  5155. fewer if nodes are excluded). Before, a service could sometimes
  5156. pick more intro points than configured. Fixes bug 31548; bugfix
  5157. on 0.3.2.1-alpha.
  5158. o Minor features (compile-time modules, backport from version 0.4.1.1-alpha):
  5159. - Add a "--list-modules" command to print a list of which compile-
  5160. time modules are enabled. Closes ticket 30452.
  5161. o Minor features (continuous integration, backport from 0.4.1.1-alpha):
  5162. - Remove sudo configuration lines from .travis.yml as they are no
  5163. longer needed with current Travis build environment. Resolves
  5164. issue 30213.
  5165. o Minor features (continuous integration, backport from 0.4.1.4-rc):
  5166. - Our Travis configuration now uses Chutney to run some network
  5167. integration tests automatically. Closes ticket 29280.
  5168. o Minor features (continuous integration, backport from 0.4.2.2-alpha):
  5169. - When building on Appveyor and Travis, pass the "-k" flag to make,
  5170. so that we are informed of all compilation failures, not just the
  5171. first one or two. Closes ticket 31372.
  5172. o Minor features (fallback directory list, backport from 0.4.1.4-rc):
  5173. - Replace the 157 fallbacks originally introduced in Tor 0.3.5.6-rc
  5174. in December 2018 (of which ~122 were still functional), with a
  5175. list of 148 fallbacks (70 new, 78 existing, 79 removed) generated
  5176. in June 2019. Closes ticket 28795.
  5177. o Minor features (geoip, backport from 0.4.2.5):
  5178. - Update geoip and geoip6 to the December 3 2019 Maxmind GeoLite2
  5179. Country database. Closes ticket 32685.
  5180. o Minor features (stem tests, backport from 0.4.2.1-alpha):
  5181. - Change "make test-stem" so it only runs the stem tests that use
  5182. tor. This change makes test-stem faster and more reliable. Closes
  5183. ticket 31554.
  5184. o Minor bugfixes (Appveyor CI, backport from 0.4.2.2-alpha):
  5185. - Avoid spurious errors when Appveyor CI fails before the install step.
  5186. Fixes bug 31884; bugfix on 0.3.4.2-alpha.
  5187. o Minor bugfixes (build system, backport form 0.4.2.1-alpha):
  5188. - Do not include the deprecated <sys/sysctl.h> on Linux or Windows
  5189. systems. Fixes bug 31673; bugfix on 0.2.5.4-alpha.
  5190. o Minor bugfixes (circuit isolation, backport from 0.4.1.3-alpha):
  5191. - Fix a logic error that prevented the SessionGroup sub-option from
  5192. being accepted. Fixes bug 22619; bugfix on 0.2.7.2-alpha.
  5193. o Minor bugfixes (circuit padding, backport from 0.4.1.4-rc):
  5194. - On relays, properly check that a padding machine is absent before
  5195. logging a warning about it being absent. Fixes bug 30649; bugfix
  5196. on 0.4.0.1-alpha.
  5197. o Minor bugfixes (client, onion service v3, backport from 0.4.2.4-rc):
  5198. - Fix a BUG() assertion that occurs within a very small race window
  5199. between when a client intro circuit opens and when its descriptor
  5200. gets cleaned up from the cache. The circuit is now closed early,
  5201. which will trigger a re-fetch of the descriptor and continue the
  5202. connection. Fixes bug 28970; bugfix on 0.3.2.1-alpha.
  5203. o Minor bugfixes (clock skew detection, backport from 0.4.1.5):
  5204. - Don't believe clock skew results from NETINFO cells that appear to
  5205. arrive before we sent the VERSIONS cells they are responding to.
  5206. Previously, we would accept them up to 3 minutes "in the past".
  5207. Fixes bug 31343; bugfix on 0.2.4.4-alpha.
  5208. o Minor bugfixes (compilation warning, backport from 0.4.1.5):
  5209. - Fix a compilation warning on Windows about casting a function
  5210. pointer for GetTickCount64(). Fixes bug 31374; bugfix
  5211. on 0.2.9.1-alpha.
  5212. o Minor bugfixes (compilation, backport from 0.4.1.5):
  5213. - Avoid using labs() on time_t, which can cause compilation warnings
  5214. on 64-bit Windows builds. Fixes bug 31343; bugfix on 0.2.4.4-alpha.
  5215. o Minor bugfixes (compilation, backport from 0.4.2.1-alpha):
  5216. - Suppress spurious float-conversion warnings from GCC when calling
  5217. floating-point classifier functions on FreeBSD. Fixes part of bug
  5218. 31687; bugfix on 0.3.1.5-alpha.
  5219. o Minor bugfixes (compilation, unusual configurations, backport from 0.4.1.1-alpha):
  5220. - Avoid failures when building with the ALL_BUGS_ARE_FATAL option
  5221. due to missing declarations of abort(), and prevent other such
  5222. failures in the future. Fixes bug 30189; bugfix on 0.3.4.1-alpha.
  5223. o Minor bugfixes (configuration, proxies, backport from 0.4.1.2-alpha):
  5224. - Fix a bug that prevented us from supporting SOCKS5 proxies that
  5225. want authentication along with configured (but unused!)
  5226. ClientTransportPlugins. Fixes bug 29670; bugfix on 0.2.6.1-alpha.
  5227. o Minor bugfixes (connections, backport from 0.4.2.3-rc):
  5228. - Avoid trying to read data from closed connections, which can cause
  5229. needless loops in Libevent and infinite loops in Shadow. Fixes bug
  5230. 30344; bugfix on 0.1.1.1-alpha.
  5231. o Minor bugfixes (continuous integration, backport from 0.4.1.3-alpha):
  5232. - Allow the test-stem job to fail in Travis, because it sometimes
  5233. hangs. Fixes bug 30744; bugfix on 0.3.5.4-alpha.
  5234. - Skip test_rebind on macOS in Travis, because it is unreliable on
  5235. macOS on Travis. Fixes bug 30713; bugfix on 0.3.5.1-alpha.
  5236. - Skip test_rebind when the TOR_SKIP_TEST_REBIND environment
  5237. variable is set. Fixes bug 30713; bugfix on 0.3.5.1-alpha.
  5238. o Minor bugfixes (crash on exit, backport from 0.4.1.4-rc):
  5239. - Avoid a set of possible code paths that could try to use freed
  5240. memory in routerlist_free() while Tor was exiting. Fixes bug
  5241. 31003; bugfix on 0.1.2.2-alpha.
  5242. o Minor bugfixes (directory authorities, backport from 0.4.1.3-alpha):
  5243. - Stop crashing after parsing an unknown descriptor purpose
  5244. annotation. We think this bug can only be triggered by modifying a
  5245. local file. Fixes bug 30781; bugfix on 0.2.0.8-alpha.
  5246. o Minor bugfixes (directory authority, backport from 0.4.1.2-alpha):
  5247. - Move the "bandwidth-file-headers" line in directory authority
  5248. votes so that it conforms to dir-spec.txt. Fixes bug 30316; bugfix
  5249. on 0.3.5.1-alpha.
  5250. o Minor bugfixes (error handling, backport from 0.4.2.1-alpha):
  5251. - On abort, try harder to flush the output buffers of log messages.
  5252. On some platforms (macOS), log messages could be discarded when
  5253. the process terminates. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
  5254. - Report the tor version whenever an assertion fails. Previously, we
  5255. only reported the Tor version on some crashes, and some non-fatal
  5256. assertions. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
  5257. o Minor bugfixes (FreeBSD, PF-based proxy, IPv6, backport from 0.4.2.1-alpha):
  5258. - When extracting an IPv6 address from a PF-based proxy, verify that
  5259. we are actually configured to receive an IPv6 address, and log an
  5260. internal error if not. Fixes part of bug 31687; bugfix
  5261. on 0.2.3.4-alpha.
  5262. o Minor bugfixes (guards, backport from 0.4.2.1-alpha):
  5263. - When tor is missing descriptors for some primary entry guards,
  5264. make the log message less alarming. It's normal for descriptors to
  5265. expire, as long as tor fetches new ones soon after. Fixes bug
  5266. 31657; bugfix on 0.3.3.1-alpha.
  5267. o Minor bugfixes (logging, backport from 0.4.1.1-alpha):
  5268. - Do not log a warning when running with an OpenSSL version other
  5269. than the one Tor was compiled with, if the two versions should be
  5270. compatible. Previously, we would warn whenever the version was
  5271. different. Fixes bug 30190; bugfix on 0.2.4.2-alpha.
  5272. o Minor bugfixes (logging, backport from 0.4.2.1-alpha):
  5273. - Change log level of message "Hash of session info was not as
  5274. expected" to LOG_PROTOCOL_WARN. Fixes bug 12399; bugfix
  5275. on 0.1.1.10-alpha.
  5276. o Minor bugfixes (logging, backport from 0.4.2.2-alpha):
  5277. - Rate-limit the logging message about the obsolete .exit
  5278. notation. Previously, there was no limit on this warning, which
  5279. could potentially be triggered many times by a hostile website.
  5280. Fixes bug 31466; bugfix on 0.2.2.1-alpha.
  5281. o Minor bugfixes (logging, protocol violations, backport from 0.4.2.2-alpha):
  5282. - Do not log a nonfatal assertion failure when receiving a VERSIONS
  5283. cell on a connection using the obsolete v1 link protocol. Log a
  5284. protocol_warn instead. Fixes bug 31107; bugfix on 0.2.4.4-alpha.
  5285. o Minor bugfixes (mainloop, periodic events, in-process API, backport from 0.4.2.3-alpha):
  5286. - Reset the periodic events' "enabled" flag when Tor is shut down
  5287. cleanly. Previously, this flag was left on, which caused periodic
  5288. events not to be re-enabled when Tor was relaunched in-process
  5289. with tor_api.h after a shutdown. Fixes bug 32058; bugfix
  5290. on 0.3.3.1-alpha.
  5291. o Minor bugfixes (memory leak, backport from 0.4.1.1-alpha):
  5292. - Avoid a minor memory leak that could occur on relays when failing
  5293. to create a "keys" directory. Fixes bug 30148; bugfix
  5294. on 0.3.3.1-alpha.
  5295. o Minor bugfixes (memory leak, backport from 0.4.1.4-rc):
  5296. - Fix a trivial memory leak when parsing an invalid value
  5297. from a download schedule in the configuration. Fixes bug
  5298. 30894; bugfix on 0.3.4.1-alpha.
  5299. o Minor bugfixes (NetBSD, backport from 0.4.1.2-alpha):
  5300. - Fix usage of minherit() on NetBSD and other platforms that define
  5301. MAP_INHERIT_{ZERO,NONE} instead of INHERIT_{ZERO,NONE}. Fixes bug
  5302. 30614; bugfix on 0.4.0.2-alpha. Patch from Taylor Campbell.
  5303. o Minor bugfixes (onion services, backport from 0.4.1.1-alpha):
  5304. - Avoid a GCC 9.1.1 warning (and possible crash depending on libc
  5305. implementation) when failing to load an onion service client
  5306. authorization file. Fixes bug 30475; bugfix on 0.3.5.1-alpha.
  5307. o Minor bugfixes (out-of-memory handler, backport from 0.4.1.2-alpha):
  5308. - When purging the DNS cache because of an out-of-memory condition,
  5309. try purging just the older entries at first. Previously, we would
  5310. always purge the whole thing. Fixes bug 29617; bugfix
  5311. on 0.3.5.1-alpha.
  5312. o Minor bugfixes (portability, backport from 0.4.1.2-alpha):
  5313. - Avoid crashing in our tor_vasprintf() implementation on systems
  5314. that define neither vasprintf() nor _vscprintf(). (This bug has
  5315. been here long enough that we question whether people are running
  5316. Tor on such systems, but we're applying the fix out of caution.)
  5317. Fixes bug 30561; bugfix on 0.2.8.2-alpha. Found and fixed by
  5318. Tobias Stoeckmann.
  5319. o Minor bugfixes (process management, backport from 0.4.2.3-alpha):
  5320. - Remove overly strict assertions that triggered when a pluggable
  5321. transport failed to launch. Fixes bug 31091; bugfix
  5322. on 0.4.0.1-alpha.
  5323. - Remove an assertion in the Unix process backend. This assertion
  5324. would trigger when we failed to find the executable for a child
  5325. process. Fixes bug 31810; bugfix on 0.4.0.1-alpha.
  5326. o Minor bugfixes (relay, backport from 0.4.2.2-alpha):
  5327. - Avoid crashing when starting with a corrupt keys directory where
  5328. the old ntor key and the new ntor key are identical. Fixes bug
  5329. 30916; bugfix on 0.2.4.8-alpha.
  5330. o Minor bugfixes (rust, backport from 0.4.2.1-alpha):
  5331. - Correctly exclude a redundant rust build job in Travis. Fixes bug
  5332. 31463; bugfix on 0.3.5.4-alpha.
  5333. o Minor bugfixes (testing, backport from 0.4.2.3-alpha):
  5334. - When testing port rebinding, don't busy-wait for tor to log.
  5335. Instead, actually sleep for a short time before polling again.
  5336. Also improve the formatting of control commands and log messages.
  5337. Fixes bug 31837; bugfix on 0.3.5.1-alpha.
  5338. o Minor bugfixes (tls, logging, backport from 0.4.2.3-alpha):
  5339. - Log bugs about the TLS read buffer's length only once, rather than
  5340. filling the logs with similar warnings. Fixes bug 31939; bugfix
  5341. on 0.3.0.4-rc.
  5342. o Minor bugfixes (v2 single onion services, backport from 0.4.2.1-alpha):
  5343. - Always retry v2 single onion service intro and rend circuits with
  5344. a 3-hop path. Previously, v2 single onion services used a 3-hop
  5345. path when rendezvous circuits were retried after a remote or
  5346. delayed failure, but a 1-hop path for immediate retries. Fixes bug
  5347. 23818; bugfix on 0.2.9.3-alpha.
  5348. - Make v3 single onion services fall back to a 3-hop intro, when all
  5349. intro points are unreachable via a 1-hop path. Previously, v3
  5350. single onion services failed when all intro nodes were unreachable
  5351. via a 1-hop path. Fixes bug 23507; bugfix on 0.3.2.1-alpha.
  5352. o Documentation (backport from 0.4.2.1-alpha):
  5353. - Use RFC 2397 data URL scheme to embed an image into tor-exit-
  5354. notice.html so that operators no longer have to host it
  5355. themselves. Closes ticket 31089.
  5356. o Testing (backport from 0.4.1.2-alpha):
  5357. - Specify torrc paths (with empty files) when launching tor in
  5358. integration tests; refrain from reading user and system torrcs.
  5359. Resolves issue 29702.
  5360. o Testing (continuous integration, backport from 0.4.1.1-alpha):
  5361. - In Travis, show stem's tor log after failure. Closes ticket 30234.
  5362. o Testing (continuous integration, backport from 0.4.1.5):
  5363. - In Travis, make stem log a controller trace to the console, and
  5364. tail stem's tor log after failure. Closes ticket 30591.
  5365. - In Travis, only run the stem tests that use a tor binary. Closes
  5366. ticket 30694.
  5367. o Testing (continuous integration, backport from 0.4.2.3-alpha):
  5368. - Disable all but one Travis CI macOS build, to mitigate slow
  5369. scheduling of Travis macOS jobs. Closes ticket 32177.
  5370. - Run the chutney IPv6 networks as part of Travis CI. Closes
  5371. ticket 30860.
  5372. - Simplify the Travis CI build matrix, and optimise for build time.
  5373. Closes ticket 31859.
  5374. - Use Windows Server 2019 instead of Windows Server 2016 in our
  5375. Appveyor builds. Closes ticket 32086.
  5376. o Testing (continuous integration, backport from 0.4.2.4-rc):
  5377. - Use Ubuntu Bionic images for our Travis CI builds, so we can get a
  5378. recent version of coccinelle. But leave chutney on Ubuntu Trusty,
  5379. until we can fix some Bionic permissions issues (see ticket
  5380. 32240). Related to ticket 31919.
  5381. - Install the mingw OpenSSL package in Appveyor. This makes sure
  5382. that the OpenSSL headers and libraries match in Tor's Appveyor
  5383. builds. (This bug was triggered by an Appveyor image update.)
  5384. Fixes bug 32449; bugfix on 0.3.5.6-rc.
  5385. - In Travis, use Xcode 11.2 on macOS 10.14. Closes ticket 32241.
  5386. o Testing (continuous integration, backport from 0.4.2.5):
  5387. - Require C99 standards-conforming code in Travis CI, but allow GNU gcc
  5388. extensions. Also activates clang's -Wtypedef-redefinition warnings.
  5389. Build some jobs with -std=gnu99, and some jobs without.
  5390. Closes ticket 32500.
  5391. Changes in version 0.3.5.9 - 2019-12-09
  5392. Tor 0.3.5.9 backports serveral fixes from later releases, including
  5393. several that affect bridge users, relay stability, onion services,
  5394. and much more.
  5395. o Directory authority changes (backport from 0.4.1.5):
  5396. - The directory authority "dizum" has a new IP address. Closes
  5397. ticket 31406.
  5398. o Major bugfixes (bridges, backport from 0.4.1.2-alpha):
  5399. - Consider our directory information to have changed when our list
  5400. of bridges changes. Previously, Tor would not re-compute the
  5401. status of its directory information when bridges changed, and
  5402. therefore would not realize that it was no longer able to build
  5403. circuits. Fixes part of bug 29875.
  5404. - Do not count previously configured working bridges towards our
  5405. total of working bridges. Previously, when Tor's list of bridges
  5406. changed, it would think that the old bridges were still usable,
  5407. and delay fetching router descriptors for the new ones. Fixes part
  5408. of bug 29875; bugfix on 0.3.0.1-alpha.
  5409. o Major bugfixes (circuit build, guard, backport from 0.4.1.4-rc):
  5410. - When considering upgrading circuits from "waiting for guard" to
  5411. "open", always ignore circuits that are marked for close. Otherwise,
  5412. we can end up in the situation where a subsystem is notified that
  5413. a closing circuit has just opened, leading to undesirable
  5414. behavior. Fixes bug 30871; bugfix on 0.3.0.1-alpha.
  5415. o Major bugfixes (NSS, relay, backport from 0.4.0.4-rc):
  5416. - When running with NSS, disable TLS 1.2 ciphersuites that use
  5417. SHA384 for their PRF. Due to an NSS bug, the TLS key exporters for
  5418. these ciphersuites don't work -- which caused relays to fail to
  5419. handshake with one another when these ciphersuites were enabled.
  5420. Fixes bug 29241; bugfix on 0.3.5.1-alpha.
  5421. o Major bugfixes (Onion service reachability, backport from 0.4.1.3-alpha):
  5422. - Properly clean up the introduction point map when circuits change
  5423. purpose from onion service circuits to pathbias, measurement, or
  5424. other circuit types. This should fix some service-side instances
  5425. of introduction point failure. Fixes bug 29034; bugfix
  5426. on 0.3.2.1-alpha.
  5427. o Major bugfixes (onion service v3, backport from 0.4.1.1-alpha):
  5428. - Fix an unreachable bug in which an introduction point could try to
  5429. send an INTRODUCE_ACK with a status code that Trunnel would refuse
  5430. to encode, leading the relay to assert(). We've consolidated the
  5431. ABI values into Trunnel now. Fixes bug 30454; bugfix
  5432. on 0.3.0.1-alpha.
  5433. - Clients can now handle unknown status codes from INTRODUCE_ACK
  5434. cells. (The NACK behavior will stay the same.) This will allow us
  5435. to extend status codes in the future without breaking the normal
  5436. client behavior. Fixes another part of bug 30454; bugfix
  5437. on 0.3.0.1-alpha.
  5438. o Major bugfixes (torrc parsing, backport from 0.4.2.2-alpha):
  5439. - Stop ignoring torrc options after an %include directive, when the
  5440. included directory ends with a file that does not contain any
  5441. config options (but does contain comments or whitespace). Fixes
  5442. bug 31408; bugfix on 0.3.1.1-alpha.
  5443. o Major bugfixes (v3 onion services, backport from 0.4.2.3-alpha):
  5444. - Onion services now always use the exact number of intro points
  5445. configured with the HiddenServiceNumIntroductionPoints option (or
  5446. fewer if nodes are excluded). Before, a service could sometimes
  5447. pick more intro points than configured. Fixes bug 31548; bugfix
  5448. on 0.3.2.1-alpha.
  5449. o Minor features (address selection, backport from 0.4.0.3-alpha):
  5450. - Treat the subnet 100.64.0.0/10 as public for some purposes;
  5451. private for others. This subnet is the RFC 6598 (Carrier Grade
  5452. NAT) IP range, and is deployed by many ISPs as an alternative to
  5453. RFC 1918 that does not break existing internal networks. Tor now
  5454. blocks SOCKS and control ports on these addresses and warns users
  5455. if client ports or ExtORPorts are listening on a RFC 6598 address.
  5456. Closes ticket 28525. Patch by Neel Chauhan.
  5457. o Minor features (bandwidth authority, backport from 0.4.0.4-rc):
  5458. - Make bandwidth authorities ignore relays that are reported in the
  5459. bandwidth file with the flag "vote=0". This change allows us to
  5460. report unmeasured relays for diagnostic reasons without including
  5461. their bandwidth in the bandwidth authorities' vote. Closes
  5462. ticket 29806.
  5463. o Minor features (compile-time modules, backport from version 0.4.1.1-alpha):
  5464. - Add a "--list-modules" command to print a list of which compile-
  5465. time modules are enabled. Closes ticket 30452.
  5466. o Minor features (continuous integration, backport from 0.4.0.4-rc):
  5467. - On Travis Rust builds, cleanup Rust registry and refrain from
  5468. caching the "target/" directory to speed up builds. Resolves
  5469. issue 29962.
  5470. o Minor features (continuous integration, backport from 0.4.0.5):
  5471. - In Travis, tell timelimit to use stem's backtrace signals, and
  5472. launch python directly from timelimit, so python receives the
  5473. signals from timelimit, rather than make. Closes ticket 30117.
  5474. o Minor features (continuous integration, backport from 0.4.1.1-alpha):
  5475. - Remove sudo configuration lines from .travis.yml as they are no
  5476. longer needed with current Travis build environment. Resolves
  5477. issue 30213.
  5478. o Minor features (continuous integration, backport from 0.4.1.4-rc):
  5479. - Our Travis configuration now uses Chutney to run some network
  5480. integration tests automatically. Closes ticket 29280.
  5481. o Minor features (continuous integration, backport from 0.4.2.2-alpha):
  5482. - When building on Appveyor and Travis, pass the "-k" flag to make,
  5483. so that we are informed of all compilation failures, not just the
  5484. first one or two. Closes ticket 31372.
  5485. o Minor features (fallback directory list, backport from 0.4.1.4-rc):
  5486. - Replace the 157 fallbacks originally introduced in Tor 0.3.5.6-rc
  5487. in December 2018 (of which ~122 were still functional), with a
  5488. list of 148 fallbacks (70 new, 78 existing, 79 removed) generated
  5489. in June 2019. Closes ticket 28795.
  5490. o Minor features (geoip, backport from 0.4.2.5):
  5491. - Update geoip and geoip6 to the December 3 2019 Maxmind GeoLite2
  5492. Country database. Closes ticket 32685.
  5493. o Minor features (NSS, diagnostic, backport from 0.4.0.4-rc):
  5494. - Try to log an error from NSS (if there is any) and a more useful
  5495. description of our situation if we are using NSS and a call to
  5496. SSL_ExportKeyingMaterial() fails. Diagnostic for ticket 29241.
  5497. o Minor features (stem tests, backport from 0.4.2.1-alpha):
  5498. - Change "make test-stem" so it only runs the stem tests that use
  5499. tor. This change makes test-stem faster and more reliable. Closes
  5500. ticket 31554.
  5501. o Minor bugfixes (security, backport from 0.4.0.4-rc):
  5502. - Verify in more places that we are not about to create a buffer
  5503. with more than INT_MAX bytes, to avoid possible OOB access in the
  5504. event of bugs. Fixes bug 30041; bugfix on 0.2.0.16. Found and
  5505. fixed by Tobias Stoeckmann.
  5506. - Fix a potential double free bug when reading huge bandwidth files.
  5507. The issue is not exploitable in the current Tor network because
  5508. the vulnerable code is only reached when directory authorities
  5509. read bandwidth files, but bandwidth files come from a trusted
  5510. source (usually the authorities themselves). Furthermore, the
  5511. issue is only exploitable in rare (non-POSIX) 32-bit architectures,
  5512. which are not used by any of the current authorities. Fixes bug
  5513. 30040; bugfix on 0.3.5.1-alpha. Bug found and fixed by
  5514. Tobias Stoeckmann.
  5515. o Minor bugfix (continuous integration, backport from 0.4.0.4-rc):
  5516. - Reset coverage state on disk after Travis CI has finished. This
  5517. should prevent future coverage merge errors from causing the test
  5518. suite for the "process" subsystem to fail. The process subsystem
  5519. was introduced in 0.4.0.1-alpha. Fixes bug 29036; bugfix
  5520. on 0.2.9.15.
  5521. - Terminate test-stem if it takes more than 9.5 minutes to run.
  5522. (Travis terminates the job after 10 minutes of no output.)
  5523. Diagnostic for 29437. Fixes bug 30011; bugfix on 0.3.5.4-alpha.
  5524. o Minor bugfixes (Appveyor CI, backport from 0.4.2.2-alpha):
  5525. - Avoid spurious errors when Appveyor CI fails before the install step.
  5526. Fixes bug 31884; bugfix on 0.3.4.2-alpha.
  5527. o Minor bugfixes (build system, backport form 0.4.2.1-alpha):
  5528. - Do not include the deprecated <sys/sysctl.h> on Linux or Windows
  5529. systems. Fixes bug 31673; bugfix on 0.2.5.4-alpha.
  5530. o Minor bugfixes (C correctness, backport from 0.4.0.4-rc):
  5531. - Fix an unlikely memory leak in consensus_diff_apply(). Fixes bug
  5532. 29824; bugfix on 0.3.1.1-alpha. This is Coverity warning
  5533. CID 1444119.
  5534. o Minor bugfixes (circuit isolation, backport from 0.4.1.3-alpha):
  5535. - Fix a logic error that prevented the SessionGroup sub-option from
  5536. being accepted. Fixes bug 22619; bugfix on 0.2.7.2-alpha.
  5537. o Minor bugfixes (client, onion service v3, backport from 0.4.2.4-rc):
  5538. - Fix a BUG() assertion that occurs within a very small race window
  5539. between when a client intro circuit opens and when its descriptor
  5540. gets cleaned up from the cache. The circuit is now closed early,
  5541. which will trigger a re-fetch of the descriptor and continue the
  5542. connection. Fixes bug 28970; bugfix on 0.3.2.1-alpha.
  5543. o Minor bugfixes (clock skew detection, backport from 0.4.1.5):
  5544. - Don't believe clock skew results from NETINFO cells that appear to
  5545. arrive before we sent the VERSIONS cells they are responding to.
  5546. Previously, we would accept them up to 3 minutes "in the past".
  5547. Fixes bug 31343; bugfix on 0.2.4.4-alpha.
  5548. o Minor bugfixes (compilation warning, backport from 0.4.1.5):
  5549. - Fix a compilation warning on Windows about casting a function
  5550. pointer for GetTickCount64(). Fixes bug 31374; bugfix
  5551. on 0.2.9.1-alpha.
  5552. o Minor bugfixes (compilation, backport from 0.4.0.2-alpha):
  5553. - Silence a compiler warning in test-memwipe.c on OpenBSD. Fixes bug
  5554. 29145; bugfix on 0.2.9.3-alpha. Patch from Kris Katterjohn.
  5555. o Minor bugfixes (compilation, backport from 0.4.1.5):
  5556. - Avoid using labs() on time_t, which can cause compilation warnings
  5557. on 64-bit Windows builds. Fixes bug 31343; bugfix on 0.2.4.4-alpha.
  5558. o Minor bugfixes (compilation, backport from 0.4.2.1-alpha):
  5559. - Suppress spurious float-conversion warnings from GCC when calling
  5560. floating-point classifier functions on FreeBSD. Fixes part of bug
  5561. 31687; bugfix on 0.3.1.5-alpha.
  5562. o Minor bugfixes (compilation, unusual configurations, backport from 0.4.1.1-alpha):
  5563. - Avoid failures when building with the ALL_BUGS_ARE_FATAL option
  5564. due to missing declarations of abort(), and prevent other such
  5565. failures in the future. Fixes bug 30189; bugfix on 0.3.4.1-alpha.
  5566. o Minor bugfixes (configuration, proxies, backport from 0.4.1.2-alpha):
  5567. - Fix a bug that prevented us from supporting SOCKS5 proxies that
  5568. want authentication along with configured (but unused!)
  5569. ClientTransportPlugins. Fixes bug 29670; bugfix on 0.2.6.1-alpha.
  5570. o Minor bugfixes (connections, backport from 0.4.2.3-rc):
  5571. - Avoid trying to read data from closed connections, which can cause
  5572. needless loops in Libevent and infinite loops in Shadow. Fixes bug
  5573. 30344; bugfix on 0.1.1.1-alpha.
  5574. o Minor bugfixes (continuous integration, backport from 0.4.1.3-alpha):
  5575. - Allow the test-stem job to fail in Travis, because it sometimes
  5576. hangs. Fixes bug 30744; bugfix on 0.3.5.4-alpha.
  5577. - Skip test_rebind on macOS in Travis, because it is unreliable on
  5578. macOS on Travis. Fixes bug 30713; bugfix on 0.3.5.1-alpha.
  5579. - Skip test_rebind when the TOR_SKIP_TEST_REBIND environment
  5580. variable is set. Fixes bug 30713; bugfix on 0.3.5.1-alpha.
  5581. o Minor bugfixes (crash on exit, backport from 0.4.1.4-rc):
  5582. - Avoid a set of possible code paths that could try to use freed
  5583. memory in routerlist_free() while Tor was exiting. Fixes bug
  5584. 31003; bugfix on 0.1.2.2-alpha.
  5585. o Minor bugfixes (directory authorities, backport from 0.4.1.3-alpha):
  5586. - Stop crashing after parsing an unknown descriptor purpose
  5587. annotation. We think this bug can only be triggered by modifying a
  5588. local file. Fixes bug 30781; bugfix on 0.2.0.8-alpha.
  5589. o Minor bugfixes (directory authority, backport from 0.4.1.2-alpha):
  5590. - Move the "bandwidth-file-headers" line in directory authority
  5591. votes so that it conforms to dir-spec.txt. Fixes bug 30316; bugfix
  5592. on 0.3.5.1-alpha.
  5593. o Minor bugfixes (error handling, backport from 0.4.2.1-alpha):
  5594. - On abort, try harder to flush the output buffers of log messages.
  5595. On some platforms (macOS), log messages could be discarded when
  5596. the process terminates. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
  5597. - Report the tor version whenever an assertion fails. Previously, we
  5598. only reported the Tor version on some crashes, and some non-fatal
  5599. assertions. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
  5600. o Minor bugfixes (FreeBSD, PF-based proxy, IPv6, backport from 0.4.2.1-alpha):
  5601. - When extracting an IPv6 address from a PF-based proxy, verify that
  5602. we are actually configured to receive an IPv6 address, and log an
  5603. internal error if not. Fixes part of bug 31687; bugfix
  5604. on 0.2.3.4-alpha.
  5605. o Minor bugfixes (guards, backport from 0.4.2.1-alpha):
  5606. - When tor is missing descriptors for some primary entry guards,
  5607. make the log message less alarming. It's normal for descriptors to
  5608. expire, as long as tor fetches new ones soon after. Fixes bug
  5609. 31657; bugfix on 0.3.3.1-alpha.
  5610. o Minor bugfixes (logging, backport from 0.4.0.2-alpha):
  5611. - Avoid logging that we are relaxing a circuit timeout when that
  5612. timeout is fixed. Fixes bug 28698; bugfix on 0.2.4.7-alpha.
  5613. o Minor bugfixes (logging, backport from 0.4.0.3-alpha):
  5614. - Correct a misleading error message when IPv4Only or IPv6Only is
  5615. used but the resolved address can not be interpreted as an address
  5616. of the specified IP version. Fixes bug 13221; bugfix on
  5617. 0.2.3.9-alpha. Patch from Kris Katterjohn.
  5618. - Log the correct port number for listening sockets when "auto" is
  5619. used to let Tor pick the port number. Previously, port 0 was
  5620. logged instead of the actual port number. Fixes bug 29144; bugfix
  5621. on 0.3.5.1-alpha. Patch from Kris Katterjohn.
  5622. - Stop logging a BUG() warning when Tor is waiting for exit
  5623. descriptors. Fixes bug 28656; bugfix on 0.3.5.1-alpha.
  5624. o Minor bugfixes (logging, backport from 0.4.1.1-alpha):
  5625. - Do not log a warning when running with an OpenSSL version other
  5626. than the one Tor was compiled with, if the two versions should be
  5627. compatible. Previously, we would warn whenever the version was
  5628. different. Fixes bug 30190; bugfix on 0.2.4.2-alpha.
  5629. o Minor bugfixes (logging, backport from 0.4.2.1-alpha):
  5630. - Change log level of message "Hash of session info was not as
  5631. expected" to LOG_PROTOCOL_WARN. Fixes bug 12399; bugfix
  5632. on 0.1.1.10-alpha.
  5633. o Minor bugfixes (logging, backport from 0.4.2.2-alpha):
  5634. - Rate-limit the logging message about the obsolete .exit
  5635. notation. Previously, there was no limit on this warning, which
  5636. could potentially be triggered many times by a hostile website.
  5637. Fixes bug 31466; bugfix on 0.2.2.1-alpha.
  5638. o Minor bugfixes (logging, protocol violations, backport from 0.4.2.2-alpha):
  5639. - Do not log a nonfatal assertion failure when receiving a VERSIONS
  5640. cell on a connection using the obsolete v1 link protocol. Log a
  5641. protocol_warn instead. Fixes bug 31107; bugfix on 0.2.4.4-alpha.
  5642. o Minor bugfixes (mainloop, periodic events, in-process API, backport from 0.4.2.3-alpha):
  5643. - Reset the periodic events' "enabled" flag when Tor is shut down
  5644. cleanly. Previously, this flag was left on, which caused periodic
  5645. events not to be re-enabled when Tor was relaunched in-process
  5646. with tor_api.h after a shutdown. Fixes bug 32058; bugfix
  5647. on 0.3.3.1-alpha.
  5648. o Minor bugfixes (memory leak, backport from 0.4.1.1-alpha):
  5649. - Avoid a minor memory leak that could occur on relays when failing
  5650. to create a "keys" directory. Fixes bug 30148; bugfix
  5651. on 0.3.3.1-alpha.
  5652. o Minor bugfixes (memory leak, backport from 0.4.1.4-rc):
  5653. - Fix a trivial memory leak when parsing an invalid value
  5654. from a download schedule in the configuration. Fixes bug
  5655. 30894; bugfix on 0.3.4.1-alpha.
  5656. o Minor bugfixes (memory management, backport from 0.4.0.3-alpha):
  5657. - Refactor the shared random state's memory management so that it
  5658. actually takes ownership of the shared random value pointers.
  5659. Fixes bug 29706; bugfix on 0.2.9.1-alpha.
  5660. o Minor bugfixes (memory management, testing, backport from 0.4.0.3-alpha):
  5661. - Stop leaking parts of the shared random state in the shared-random
  5662. unit tests. Fixes bug 29599; bugfix on 0.2.9.1-alpha.
  5663. o Minor bugfixes (onion services, backport from 0.4.1.1-alpha):
  5664. - Avoid a GCC 9.1.1 warning (and possible crash depending on libc
  5665. implementation) when failing to load an onion service client
  5666. authorization file. Fixes bug 30475; bugfix on 0.3.5.1-alpha.
  5667. o Minor bugfixes (out-of-memory handler, backport from 0.4.1.2-alpha):
  5668. - When purging the DNS cache because of an out-of-memory condition,
  5669. try purging just the older entries at first. Previously, we would
  5670. always purge the whole thing. Fixes bug 29617; bugfix
  5671. on 0.3.5.1-alpha.
  5672. o Minor bugfixes (portability, backport from 0.4.1.2-alpha):
  5673. - Avoid crashing in our tor_vasprintf() implementation on systems
  5674. that define neither vasprintf() nor _vscprintf(). (This bug has
  5675. been here long enough that we question whether people are running
  5676. Tor on such systems, but we're applying the fix out of caution.)
  5677. Fixes bug 30561; bugfix on 0.2.8.2-alpha. Found and fixed by
  5678. Tobias Stoeckmann.
  5679. o Minor bugfixes (relay, backport from 0.4.2.2-alpha):
  5680. - Avoid crashing when starting with a corrupt keys directory where
  5681. the old ntor key and the new ntor key are identical. Fixes bug
  5682. 30916; bugfix on 0.2.4.8-alpha.
  5683. o Minor bugfixes (rust, backport from 0.4.0.5):
  5684. - Abort on panic in all build profiles, instead of potentially
  5685. unwinding into C code. Fixes bug 27199; bugfix on 0.3.3.1-alpha.
  5686. o Minor bugfixes (rust, backport from 0.4.2.1-alpha):
  5687. - Correctly exclude a redundant rust build job in Travis. Fixes bug
  5688. 31463; bugfix on 0.3.5.4-alpha.
  5689. o Minor bugfixes (single onion services, backport from 0.4.0.3-alpha):
  5690. - Allow connections to single onion services to remain idle without
  5691. being disconnected. Previously, relays acting as rendezvous points
  5692. for single onion services were mistakenly closing idle rendezvous
  5693. circuits after 60 seconds, thinking that they were unused
  5694. directory-fetching circuits that had served their purpose. Fixes
  5695. bug 29665; bugfix on 0.2.1.26.
  5696. o Minor bugfixes (stats, backport from 0.4.0.3-alpha):
  5697. - When ExtraInfoStatistics is 0, stop including PaddingStatistics in
  5698. relay and bridge extra-info documents. Fixes bug 29017; bugfix
  5699. on 0.3.1.1-alpha.
  5700. o Minor bugfixes (testing, backport from 0.4.0.3-alpha):
  5701. - Downgrade some LOG_ERR messages in the address/* tests to
  5702. warnings. The LOG_ERR messages were occurring when we had no
  5703. configured network. We were failing the unit tests, because we
  5704. backported 28668 to 0.3.5.8, but did not backport 29530. Fixes bug
  5705. 29530; bugfix on 0.3.5.8.
  5706. - Fix our gcov wrapper script to look for object files at the
  5707. correct locations. Fixes bug 29435; bugfix on 0.3.5.1-alpha.
  5708. o Minor bugfixes (testing, backport from 0.4.0.4-rc):
  5709. - Backport the 0.3.4 src/test/test-network.sh to 0.2.9. We need a
  5710. recent test-network.sh to use new chutney features in CI. Fixes
  5711. bug 29703; bugfix on 0.2.9.1-alpha.
  5712. - Fix a test failure on Windows caused by an unexpected "BUG"
  5713. warning in our tests for tor_gmtime_r(-1). Fixes bug 29922; bugfix
  5714. on 0.2.9.3-alpha.
  5715. o Minor bugfixes (testing, backport from 0.4.2.3-alpha):
  5716. - When testing port rebinding, don't busy-wait for tor to log.
  5717. Instead, actually sleep for a short time before polling again.
  5718. Also improve the formatting of control commands and log messages.
  5719. Fixes bug 31837; bugfix on 0.3.5.1-alpha.
  5720. o Minor bugfixes (TLS protocol, backport form 0.4.0.4-rc):
  5721. - When classifying a client's selection of TLS ciphers, if the
  5722. client ciphers are not yet available, do not cache the result.
  5723. Previously, we had cached the unavailability of the cipher list
  5724. and never looked again, which in turn led us to assume that the
  5725. client only supported the ancient V1 link protocol. This, in turn,
  5726. was causing Stem integration tests to stall in some cases. Fixes
  5727. bug 30021; bugfix on 0.2.4.8-alpha.
  5728. o Minor bugfixes (tls, logging, backport from 0.4.2.3-alpha):
  5729. - Log bugs about the TLS read buffer's length only once, rather than
  5730. filling the logs with similar warnings. Fixes bug 31939; bugfix
  5731. on 0.3.0.4-rc.
  5732. o Minor bugfixes (v2 single onion services, backport from 0.4.2.1-alpha):
  5733. - Always retry v2 single onion service intro and rend circuits with
  5734. a 3-hop path. Previously, v2 single onion services used a 3-hop
  5735. path when rendezvous circuits were retried after a remote or
  5736. delayed failure, but a 1-hop path for immediate retries. Fixes bug
  5737. 23818; bugfix on 0.2.9.3-alpha.
  5738. - Make v3 single onion services fall back to a 3-hop intro, when all
  5739. intro points are unreachable via a 1-hop path. Previously, v3
  5740. single onion services failed when all intro nodes were unreachable
  5741. via a 1-hop path. Fixes bug 23507; bugfix on 0.3.2.1-alpha.
  5742. o Minor bugfixes (Windows, CI, backport from 0.4.0.3-alpha):
  5743. - Skip the Appveyor 32-bit Windows Server 2016 job, and 64-bit
  5744. Windows Server 2012 R2 job. The remaining 2 jobs still provide
  5745. coverage of 64/32-bit, and Windows Server 2016/2012 R2. Also set
  5746. fast_finish, so failed jobs terminate the build immediately. Fixes
  5747. bug 29601; bugfix on 0.3.5.4-alpha.
  5748. o Documentation (backport from 0.4.2.1-alpha):
  5749. - Use RFC 2397 data URL scheme to embed an image into tor-exit-
  5750. notice.html so that operators no longer have to host it
  5751. themselves. Closes ticket 31089.
  5752. o Testing (backport from 0.4.1.2-alpha):
  5753. - Specify torrc paths (with empty files) when launching tor in
  5754. integration tests; refrain from reading user and system torrcs.
  5755. Resolves issue 29702.
  5756. o Testing (continuous integration, backport from 0.4.1.1-alpha):
  5757. - In Travis, show stem's tor log after failure. Closes ticket 30234.
  5758. o Testing (continuous integration, backport from 0.4.1.5):
  5759. - In Travis, make stem log a controller trace to the console, and
  5760. tail stem's tor log after failure. Closes ticket 30591.
  5761. - In Travis, only run the stem tests that use a tor binary. Closes
  5762. ticket 30694.
  5763. o Testing (continuous integration, backport from 0.4.2.3-alpha):
  5764. - Disable all but one Travis CI macOS build, to mitigate slow
  5765. scheduling of Travis macOS jobs. Closes ticket 32177.
  5766. - Run the chutney IPv6 networks as part of Travis CI. Closes
  5767. ticket 30860.
  5768. - Simplify the Travis CI build matrix, and optimise for build time.
  5769. Closes ticket 31859.
  5770. - Use Windows Server 2019 instead of Windows Server 2016 in our
  5771. Appveyor builds. Closes ticket 32086.
  5772. o Testing (continuous integration, backport from 0.4.2.4-rc):
  5773. - Use Ubuntu Bionic images for our Travis CI builds, so we can get a
  5774. recent version of coccinelle. But leave chutney on Ubuntu Trusty,
  5775. until we can fix some Bionic permissions issues (see ticket
  5776. 32240). Related to ticket 31919.
  5777. - Install the mingw OpenSSL package in Appveyor. This makes sure
  5778. that the OpenSSL headers and libraries match in Tor's Appveyor
  5779. builds. (This bug was triggered by an Appveyor image update.)
  5780. Fixes bug 32449; bugfix on 0.3.5.6-rc.
  5781. - In Travis, use Xcode 11.2 on macOS 10.14. Closes ticket 32241.
  5782. o Testing (continuous integration, backport from 0.4.2.5):
  5783. - Require C99 standards-conforming code in Travis CI, but allow GNU gcc
  5784. extensions. Also activates clang's -Wtypedef-redefinition warnings.
  5785. Build some jobs with -std=gnu99, and some jobs without.
  5786. Closes ticket 32500.
  5787. Changes in version 0.4.1.6 - 2019-09-19
  5788. This release backports several bugfixes to improve stability and
  5789. correctness. Anyone experiencing build problems or crashes with 0.4.1.5,
  5790. or experiencing reliability issues with single onion services, should
  5791. upgrade.
  5792. o Major bugfixes (crash, Linux, Android, backport from 0.4.2.1-alpha):
  5793. - Tolerate systems (including some Android installations) where
  5794. madvise and MADV_DONTDUMP are available at build-time, but not at
  5795. run time. Previously, these systems would notice a failed syscall
  5796. and abort. Fixes bug 31570; bugfix on 0.4.1.1-alpha.
  5797. - Tolerate systems (including some Linux installations) where
  5798. madvise and/or MADV_DONTFORK are available at build-time, but not
  5799. at run time. Previously, these systems would notice a failed
  5800. syscall and abort. Fixes bug 31696; bugfix on 0.4.1.1-alpha.
  5801. o Minor features (stem tests, backport from 0.4.2.1-alpha):
  5802. - Change "make test-stem" so it only runs the stem tests that use
  5803. tor. This change makes test-stem faster and more reliable. Closes
  5804. ticket 31554.
  5805. o Minor bugfixes (build system, backport form 0.4.2.1-alpha):
  5806. - Do not include the deprecated <sys/sysctl.h> on Linux or Windows
  5807. systems. Fixes bug 31673; bugfix on 0.2.5.4-alpha.
  5808. o Minor bugfixes (compilation, backport from 0.4.2.1-alpha):
  5809. - Add more stub functions to fix compilation on Android with link-
  5810. time optimization when --disable-module-dirauth is used.
  5811. Previously, these compilation settings would make the compiler
  5812. look for functions that didn't exist. Fixes bug 31552; bugfix
  5813. on 0.4.1.1-alpha.
  5814. - Suppress spurious float-conversion warnings from GCC when calling
  5815. floating-point classifier functions on FreeBSD. Fixes part of bug
  5816. 31687; bugfix on 0.3.1.5-alpha.
  5817. o Minor bugfixes (controller protocol):
  5818. - Fix the MAPADDRESS controller command to accept one or more
  5819. arguments. Previously, it required two or more arguments, and ignored
  5820. the first. Fixes bug 31772; bugfix on 0.4.1.1-alpha.
  5821. o Minor bugfixes (FreeBSD, PF-based proxy, IPv6, backport from 0.4.2.1-alpha):
  5822. - When extracting an IPv6 address from a PF-based proxy, verify that
  5823. we are actually configured to receive an IPv6 address, and log an
  5824. internal error if not. Fixes part of bug 31687; bugfix
  5825. on 0.2.3.4-alpha.
  5826. o Minor bugfixes (guards, backport from 0.4.2.1-alpha):
  5827. - When tor is missing descriptors for some primary entry guards,
  5828. make the log message less alarming. It's normal for descriptors to
  5829. expire, as long as tor fetches new ones soon after. Fixes bug
  5830. 31657; bugfix on 0.3.3.1-alpha.
  5831. o Minor bugfixes (logging, backport from 0.4.2.1-alpha):
  5832. - Change log level of message "Hash of session info was not as
  5833. expected" to LOG_PROTOCOL_WARN. Fixes bug 12399; bugfix
  5834. on 0.1.1.10-alpha.
  5835. o Minor bugfixes (rust, backport from 0.4.2.1-alpha):
  5836. - Correctly exclude a redundant rust build job in Travis. Fixes bug
  5837. 31463; bugfix on 0.3.5.4-alpha.
  5838. o Minor bugfixes (v2 single onion services, backport from 0.4.2.1-alpha):
  5839. - Always retry v2 single onion service intro and rend circuits with
  5840. a 3-hop path. Previously, v2 single onion services used a 3-hop
  5841. path when rendezvous circuits were retried after a remote or
  5842. delayed failure, but a 1-hop path for immediate retries. Fixes bug
  5843. 23818; bugfix on 0.2.9.3-alpha.
  5844. o Minor bugfixes (v3 single onion services, backport from 0.4.2.1-alpha):
  5845. - Always retry v3 single onion service intro and rend circuits with
  5846. a 3-hop path. Previously, v3 single onion services used a 3-hop
  5847. path when rend circuits were retried after a remote or delayed
  5848. failure, but a 1-hop path for immediate retries. Fixes bug 23818;
  5849. bugfix on 0.3.2.1-alpha.
  5850. - Make v3 single onion services fall back to a 3-hop intro, when all
  5851. intro points are unreachable via a 1-hop path. Previously, v3
  5852. single onion services failed when all intro nodes were unreachable
  5853. via a 1-hop path. Fixes bug 23507; bugfix on 0.3.2.1-alpha.
  5854. o Documentation (backport from 0.4.2.1-alpha):
  5855. - Use RFC 2397 data URL scheme to embed an image into tor-exit-
  5856. notice.html so that operators no longer have to host it
  5857. themselves. Closes ticket 31089.
  5858. Changes in version 0.4.1.5 - 2019-08-20
  5859. This is the first stable release in the 0.4.1.x series. This series
  5860. adds experimental circuit-level padding, authenticated SENDME cells to
  5861. defend against certain attacks, and several performance improvements
  5862. to save on CPU consumption. It fixes bugs in bootstrapping and v3
  5863. onion services. It also includes numerous smaller features and
  5864. bugfixes on earlier versions.
  5865. Per our support policy, we will support the 0.4.1.x series for nine
  5866. months, or until three months after the release of a stable 0.4.2.x:
  5867. whichever is longer. If you need longer-term support, please stick
  5868. with 0.3.5.x, which will we plan to support until Feb 2022.
  5869. Below are the changes since 0.4.0.5. For a list of only the changes
  5870. since 0.4.1.4-rc, see the ChangeLog file.
  5871. o Directory authority changes:
  5872. - The directory authority "dizum" has a new IP address. Closes
  5873. ticket 31406.
  5874. o Major features (circuit padding):
  5875. - Onion service clients now add padding cells at the start of their
  5876. INTRODUCE and RENDEZVOUS circuits, to make those circuits' traffic
  5877. look more like general purpose Exit traffic. The overhead for this
  5878. is 2 extra cells in each direction for RENDEZVOUS circuits, and 1
  5879. extra upstream cell and 10 downstream cells for INTRODUCE
  5880. circuits. This feature is only enabled when also supported by the
  5881. circuit's middle node. (Clients may specify fixed middle nodes
  5882. with the MiddleNodes option, and may force-disable this feature
  5883. with the CircuitPadding option.) Closes ticket 28634.
  5884. o Major features (code organization):
  5885. - Tor now includes a generic publish-subscribe message-passing
  5886. subsystem that we can use to organize intermodule dependencies. We
  5887. hope to use this to reduce dependencies between modules that don't
  5888. need to be related, and to generally simplify our codebase. Closes
  5889. ticket 28226.
  5890. o Major features (controller protocol):
  5891. - Controller commands are now parsed using a generalized parsing
  5892. subsystem. Previously, each controller command was responsible for
  5893. parsing its own input, which led to strange inconsistencies.
  5894. Closes ticket 30091.
  5895. o Major features (flow control):
  5896. - Implement authenticated SENDMEs as detailed in proposal 289. A
  5897. SENDME cell now includes the digest of the traffic that it
  5898. acknowledges, so that once an end point receives the SENDME, it
  5899. can confirm the other side's knowledge of the previous cells that
  5900. were sent, and prevent certain types of denial-of-service attacks.
  5901. This behavior is controlled by two new consensus parameters: see
  5902. the proposal for more details. Fixes ticket 26288.
  5903. o Major features (performance):
  5904. - Our node selection algorithm now excludes nodes in linear time.
  5905. Previously, the algorithm was quadratic, which could slow down
  5906. heavily used onion services. Closes ticket 30307.
  5907. o Major features (performance, RNG):
  5908. - Tor now constructs a fast secure pseudorandom number generator for
  5909. each thread, to use when performance is critical. This PRNG is
  5910. based on AES-CTR, using a buffering construction similar to
  5911. libottery and the (newer) OpenBSD arc4random() code. It
  5912. outperforms OpenSSL 1.1.1a's CSPRNG by roughly a factor of 100 for
  5913. small outputs. Although we believe it to be cryptographically
  5914. strong, we are only using it when necessary for performance.
  5915. Implements tickets 29023 and 29536.
  5916. o Major bugfixes (bridges):
  5917. - Consider our directory information to have changed when our list
  5918. of bridges changes. Previously, Tor would not re-compute the
  5919. status of its directory information when bridges changed, and
  5920. therefore would not realize that it was no longer able to build
  5921. circuits. Fixes part of bug 29875.
  5922. - Do not count previously configured working bridges towards our
  5923. total of working bridges. Previously, when Tor's list of bridges
  5924. changed, it would think that the old bridges were still usable,
  5925. and delay fetching router descriptors for the new ones. Fixes part
  5926. of bug 29875; bugfix on 0.3.0.1-alpha.
  5927. o Major bugfixes (circuit build, guard):
  5928. - On relays, properly check that a padding machine is absent before
  5929. logging a warning about it being absent. Fixes bug 30649; bugfix
  5930. on 0.4.0.1-alpha.
  5931. - When considering upgrading circuits from "waiting for guard" to
  5932. "open", always ignore circuits that are marked for close. Otherwise,
  5933. we can end up in the situation where a subsystem is notified that
  5934. a closing circuit has just opened, leading to undesirable
  5935. behavior. Fixes bug 30871; bugfix on 0.3.0.1-alpha.
  5936. o Major bugfixes (onion service reachability):
  5937. - Properly clean up the introduction point map when circuits change
  5938. purpose from onion service circuits to pathbias, measurement, or
  5939. other circuit types. This should fix some service-side instances
  5940. of introduction point failure. Fixes bug 29034; bugfix
  5941. on 0.3.2.1-alpha.
  5942. o Major bugfixes (onion service v3):
  5943. - Fix an unreachable bug in which an introduction point could try to
  5944. send an INTRODUCE_ACK with a status code that Trunnel would refuse
  5945. to encode, leading the relay to assert(). We've consolidated the
  5946. ABI values into Trunnel now. Fixes bug 30454; bugfix
  5947. on 0.3.0.1-alpha.
  5948. - Clients can now handle unknown status codes from INTRODUCE_ACK
  5949. cells. (The NACK behavior will stay the same.) This will allow us
  5950. to extend status codes in the future without breaking the normal
  5951. client behavior. Fixes another part of bug 30454; bugfix
  5952. on 0.3.0.1-alpha.
  5953. o Minor features (authenticated SENDME):
  5954. - Ensure that there is enough randomness on every circuit to prevent
  5955. an attacker from successfully predicting the hashes they will need
  5956. to include in authenticated SENDME cells. At a random interval, if
  5957. we have not sent randomness already, we now leave some extra space
  5958. at the end of a cell that we can fill with random bytes. Closes
  5959. ticket 26846.
  5960. o Minor features (circuit padding logging):
  5961. - Demote noisy client-side warn logs about circuit padding to protocol
  5962. warnings. Add additional log messages and circuit ID fields to help
  5963. with bug 30992 and any other future issues.
  5964. o Minor features (circuit padding):
  5965. - We now use a fast PRNG when scheduling circuit padding. Part of
  5966. ticket 28636.
  5967. - Allow the padding machine designer to pick the edges of their
  5968. histogram instead of trying to compute them automatically using an
  5969. exponential formula. Resolves some undefined behavior in the case
  5970. of small histograms and allows greater flexibility on machine
  5971. design. Closes ticket 29298; bugfix on 0.4.0.1-alpha.
  5972. - Allow circuit padding machines to hold a circuit open until they
  5973. are done padding it. Closes ticket 28780.
  5974. o Minor features (compile-time modules):
  5975. - Add a "--list-modules" command to print a list of which compile-
  5976. time modules are enabled. Closes ticket 30452.
  5977. o Minor features (continuous integration):
  5978. - Our Travis configuration now uses Chutney to run some network
  5979. integration tests automatically. Closes ticket 29280.
  5980. - When running coverage builds on Travis, we now set
  5981. TOR_TEST_RNG_SEED, to avoid RNG-based coverage differences. Part
  5982. of ticket 28878.
  5983. - Remove sudo configuration lines from .travis.yml as they are no
  5984. longer needed with current Travis build environment. Resolves
  5985. issue 30213.
  5986. - In Travis, show stem's tor log after failure. Closes ticket 30234.
  5987. o Minor features (controller):
  5988. - Add onion service version 3 support to the HSFETCH command.
  5989. Previously, only version 2 onion services were supported. Closes
  5990. ticket 25417. Patch by Neel Chauhan.
  5991. o Minor features (debugging):
  5992. - Introduce tor_assertf() and tor_assertf_nonfatal() to enable
  5993. logging of additional information during assert failure. Now we
  5994. can use format strings to include information for trouble
  5995. shooting. Resolves ticket 29662.
  5996. o Minor features (defense in depth):
  5997. - In smartlist_remove_keeporder(), set unused pointers to NULL, in
  5998. case a bug causes them to be used later. Closes ticket 30176.
  5999. Patch from Tobias Stoeckmann.
  6000. - Tor now uses a cryptographically strong PRNG even for decisions
  6001. that we do not believe are security-sensitive. Previously, for
  6002. performance reasons, we had used a trivially predictable linear
  6003. congruential generator algorithm for certain load-balancing and
  6004. statistical sampling decisions. Now we use our fast RNG in those
  6005. cases. Closes ticket 29542.
  6006. o Minor features (developer tools):
  6007. - Tor's "practracker" test script now checks for files and functions
  6008. that seem too long and complicated. Existing overlong functions
  6009. and files are accepted for now, but should eventually be
  6010. refactored. Closes ticket 29221.
  6011. - Add some scripts used for git maintenance to scripts/git. Closes
  6012. ticket 29391.
  6013. - Call practracker from pre-push and pre-commit git hooks to let
  6014. developers know if they made any code style violations. Closes
  6015. ticket 30051.
  6016. - Add a script to check that each header has a well-formed and
  6017. unique guard macro. Closes ticket 29756.
  6018. o Minor features (fallback directory list):
  6019. - Replace the 157 fallbacks originally introduced in Tor 0.3.5.6-rc
  6020. in December 2018 (of which ~122 were still functional), with a
  6021. list of 148 fallbacks (70 new, 78 existing, 79 removed) generated
  6022. in June 2019. Closes ticket 28795.
  6023. o Minor features (geoip):
  6024. - Update geoip and geoip6 to the June 10 2019 Maxmind GeoLite2
  6025. Country database. Closes ticket 30852.
  6026. - Update geoip and geoip6 to the May 13 2019 Maxmind GeoLite2
  6027. Country database. Closes ticket 30522.
  6028. o Minor features (HTTP tunnel):
  6029. - Return an informative web page when the HTTPTunnelPort is used as
  6030. an HTTP proxy. Closes ticket 27821, patch by "eighthave".
  6031. o Minor features (IPv6, v3 onion services):
  6032. - Make v3 onion services put IPv6 addresses in service descriptors.
  6033. Before this change, service descriptors only contained IPv4
  6034. addresses. Implements 26992.
  6035. o Minor features (logging):
  6036. - Give a more useful assertion failure message if we think we have
  6037. minherit() but we fail to make a region non-inheritable. Give a
  6038. compile-time warning if our support for minherit() is incomplete.
  6039. Closes ticket 30686.
  6040. o Minor features (maintenance):
  6041. - Add a new "make autostyle" target that developers can use to apply
  6042. all automatic Tor style and consistency conversions to the
  6043. codebase. Closes ticket 30539.
  6044. o Minor features (modularity):
  6045. - The "--disable-module-dirauth" compile-time option now disables
  6046. even more dirauth-only code. Closes ticket 30345.
  6047. o Minor features (performance):
  6048. - Use OpenSSL's implementations of SHA3 when available (in OpenSSL
  6049. 1.1.1 and later), since they tend to be faster than tiny-keccak.
  6050. Closes ticket 28837.
  6051. o Minor features (testing):
  6052. - The circuitpadding tests now use a reproducible RNG implementation,
  6053. so that if a test fails, we can learn why. Part of ticket 28878.
  6054. - Tor's tests now support an environment variable, TOR_TEST_RNG_SEED,
  6055. to set the RNG seed for tests that use a reproducible RNG. Part of
  6056. ticket 28878.
  6057. - When running tests in coverage mode, take additional care to make
  6058. our coverage deterministic, so that we can accurately track
  6059. changes in code coverage. Closes ticket 30519.
  6060. - Tor's unit test code now contains helper functions to replace the
  6061. PRNG with a deterministic or reproducible version for testing.
  6062. Previously, various tests implemented this in various ways.
  6063. Implements ticket 29732.
  6064. - We now have a script, cov-test-determinism.sh, to identify places
  6065. where our unit test coverage has become nondeterministic. Closes
  6066. ticket 29436.
  6067. - Check that representative subsets of values of `int` and `unsigned
  6068. int` can be represented by `void *`. Resolves issue 29537.
  6069. o Minor bugfixes (bridge authority):
  6070. - Bridge authorities now set bridges as running or non-running when
  6071. about to dump their status to a file. Previously, they set bridges
  6072. as running in response to a GETINFO command, but those shouldn't
  6073. modify data structures. Fixes bug 24490; bugfix on 0.2.0.13-alpha.
  6074. Patch by Neel Chauhan.
  6075. o Minor bugfixes (channel padding statistics):
  6076. - Channel padding write totals and padding-enabled totals are now
  6077. counted properly in relay extrainfo descriptors. Fixes bug 29231;
  6078. bugfix on 0.3.1.1-alpha.
  6079. o Minor bugfixes (circuit isolation):
  6080. - Fix a logic error that prevented the SessionGroup sub-option from
  6081. being accepted. Fixes bug 22619; bugfix on 0.2.7.2-alpha.
  6082. o Minor bugfixes (circuit padding):
  6083. - Add a "CircuitPadding" torrc option to disable circuit padding.
  6084. Fixes bug 28693; bugfix on 0.4.0.1-alpha.
  6085. - Allow circuit padding machines to specify that they do not
  6086. contribute much overhead, and provide consensus flags and torrc
  6087. options to force clients to only use these low overhead machines.
  6088. Fixes bug 29203; bugfix on 0.4.0.1-alpha.
  6089. - Provide a consensus parameter to fully disable circuit padding, to
  6090. be used in emergency network overload situations. Fixes bug 30173;
  6091. bugfix on 0.4.0.1-alpha.
  6092. - The circuit padding subsystem will no longer schedule padding if
  6093. dormant mode is enabled. Fixes bug 28636; bugfix on 0.4.0.1-alpha.
  6094. - Inspect a circuit-level cell queue before sending padding, to
  6095. avoid sending padding while too much data is already queued. Fixes
  6096. bug 29204; bugfix on 0.4.0.1-alpha.
  6097. - Avoid calling monotime_absolute_usec() in circuit padding machines
  6098. that do not use token removal or circuit RTT estimation. Fixes bug
  6099. 29085; bugfix on 0.4.0.1-alpha.
  6100. o Minor bugfixes (clock skew detection):
  6101. - Don't believe clock skew results from NETINFO cells that appear to
  6102. arrive before we sent the VERSIONS cells they are responding to.
  6103. Previously, we would accept them up to 3 minutes "in the past".
  6104. Fixes bug 31343; bugfix on 0.2.4.4-alpha.
  6105. o Minor bugfixes (compatibility, standards compliance):
  6106. - Fix a bug that would invoke undefined behavior on certain
  6107. operating systems when trying to asprintf() a string exactly
  6108. INT_MAX bytes long. We don't believe this is exploitable, but it's
  6109. better to fix it anyway. Fixes bug 31001; bugfix on 0.2.2.11-alpha.
  6110. Found and fixed by Tobias Stoeckmann.
  6111. o Minor bugfixes (compilation warning):
  6112. - Fix a compilation warning on Windows about casting a function
  6113. pointer for GetTickCount64(). Fixes bug 31374; bugfix on
  6114. 0.2.9.1-alpha.
  6115. o Minor bugfixes (compilation):
  6116. - Avoid using labs() on time_t, which can cause compilation warnings
  6117. on 64-bit Windows builds. Fixes bug 31343; bugfix on 0.2.4.4-alpha.
  6118. o Minor bugfixes (compilation, unusual configurations):
  6119. - Avoid failures when building with the ALL_BUGS_ARE_FATAL option
  6120. due to missing declarations of abort(), and prevent other such
  6121. failures in the future. Fixes bug 30189; bugfix on 0.3.4.1-alpha.
  6122. o Minor bugfixes (configuration, proxies):
  6123. - Fix a bug that prevented us from supporting SOCKS5 proxies that
  6124. want authentication along with configured (but unused!)
  6125. ClientTransportPlugins. Fixes bug 29670; bugfix on 0.2.6.1-alpha.
  6126. o Minor bugfixes (continuous integration):
  6127. - Allow the test-stem job to fail in Travis, because it sometimes
  6128. hangs. Fixes bug 30744; bugfix on 0.3.5.4-alpha.
  6129. - Skip test_rebind on macOS in Travis, because it is unreliable on
  6130. macOS on Travis. Fixes bug 30713; bugfix on 0.3.5.1-alpha.
  6131. - Skip test_rebind when the TOR_SKIP_TEST_REBIND environment
  6132. variable is set. Fixes bug 30713; bugfix on 0.3.5.1-alpha.
  6133. o Minor bugfixes (controller protocol):
  6134. - Teach the controller parser to distinguish an object preceded by
  6135. an argument list from one without. Previously, it couldn't
  6136. distinguish an argument list from the first line of a multiline
  6137. object. Fixes bug 29984; bugfix on 0.2.3.8-alpha.
  6138. o Minor bugfixes (crash on exit):
  6139. - Avoid a set of possible code paths that could try to use freed
  6140. memory in routerlist_free() while Tor was exiting. Fixes bug
  6141. 31003; bugfix on 0.1.2.2-alpha.
  6142. o Minor bugfixes (developer tooling):
  6143. - Fix pre-push hook to allow fixup and squash commits when pushing
  6144. to non-upstream git remote. Fixes bug 30286; bugfix
  6145. on 0.4.0.1-alpha.
  6146. o Minor bugfixes (directory authorities):
  6147. - Stop crashing after parsing an unknown descriptor purpose
  6148. annotation. We think this bug can only be triggered by modifying a
  6149. local file. Fixes bug 30781; bugfix on 0.2.0.8-alpha.
  6150. - Move the "bandwidth-file-headers" line in directory authority
  6151. votes so that it conforms to dir-spec.txt. Fixes bug 30316; bugfix
  6152. on 0.3.5.1-alpha.
  6153. - Directory authorities with IPv6 support now always mark themselves
  6154. as reachable via IPv6. Fixes bug 24338; bugfix on 0.2.4.1-alpha.
  6155. Patch by Neel Chauhan.
  6156. o Minor bugfixes (documentation):
  6157. - Improve the documentation for using MapAddress with ".exit". Fixes
  6158. bug 30109; bugfix on 0.1.0.1-rc.
  6159. - Improve the monotonic time module and function documentation to
  6160. explain what "monotonic" actually means, and document some results
  6161. that have surprised people. Fixes bug 29640; bugfix
  6162. on 0.2.9.1-alpha.
  6163. - Use proper formatting when providing an example on quoting options
  6164. that contain whitespace. Fixes bug 29635; bugfix on 0.2.3.18-rc.
  6165. o Minor bugfixes (logging):
  6166. - Do not log a warning when running with an OpenSSL version other
  6167. than the one Tor was compiled with, if the two versions should be
  6168. compatible. Previously, we would warn whenever the version was
  6169. different. Fixes bug 30190; bugfix on 0.2.4.2-alpha.
  6170. - Warn operators when the MyFamily option is set but ContactInfo is
  6171. missing, as the latter should be set too. Fixes bug 25110; bugfix
  6172. on 0.3.3.1-alpha.
  6173. o Minor bugfixes (memory leaks):
  6174. - Avoid a minor memory leak that could occur on relays when failing
  6175. to create a "keys" directory. Fixes bug 30148; bugfix
  6176. on 0.3.3.1-alpha.
  6177. - Fix a trivial memory leak when parsing an invalid value from a
  6178. download schedule in the configuration. Fixes bug 30894; bugfix
  6179. on 0.3.4.1-alpha.
  6180. o Minor bugfixes (NetBSD):
  6181. - Fix usage of minherit() on NetBSD and other platforms that define
  6182. MAP_INHERIT_{ZERO,NONE} instead of INHERIT_{ZERO,NONE}. Fixes bug
  6183. 30614; bugfix on 0.4.0.2-alpha. Patch from Taylor Campbell.
  6184. o Minor bugfixes (onion services):
  6185. - Avoid a GCC 9.1.1 warning (and possible crash depending on libc
  6186. implementation) when failing to load an onion service client
  6187. authorization file. Fixes bug 30475; bugfix on 0.3.5.1-alpha.
  6188. - When refusing to launch a controller's HSFETCH request because of
  6189. rate-limiting, respond to the controller with a new response,
  6190. "QUERY_RATE_LIMITED". Previously, we would log QUERY_NO_HSDIR for
  6191. this case. Fixes bug 28269; bugfix on 0.3.1.1-alpha. Patch by
  6192. Neel Chauhan.
  6193. - When relaunching a circuit to a rendezvous service, mark the
  6194. circuit as needing high-uptime routers as appropriate. Fixes bug
  6195. 17357; bugfix on 0.1.0.1-rc. Patch by Neel Chauhan.
  6196. - Stop ignoring IPv6 link specifiers sent to v3 onion services.
  6197. (IPv6 support for v3 onion services is still incomplete: see
  6198. ticket 23493 for details.) Fixes bug 23588; bugfix on
  6199. 0.3.2.1-alpha. Patch by Neel Chauhan.
  6200. o Minor bugfixes (onion services, performance):
  6201. - When building circuits to onion services, call tor_addr_parse()
  6202. less often. Previously, we called tor_addr_parse() in
  6203. circuit_is_acceptable() even if its output wasn't used. This
  6204. change should improve performance when building circuits. Fixes
  6205. bug 22210; bugfix on 0.2.8.12. Patch by Neel Chauhan.
  6206. o Minor bugfixes (out-of-memory handler):
  6207. - When purging the DNS cache because of an out-of-memory condition,
  6208. try purging just the older entries at first. Previously, we would
  6209. always purge the whole thing. Fixes bug 29617; bugfix
  6210. on 0.3.5.1-alpha.
  6211. o Minor bugfixes (performance):
  6212. - When checking whether a node is a bridge, use a fast check to make
  6213. sure that its identity is set. Previously, we used a constant-time
  6214. check, which is not necessary in this case. Fixes bug 30308;
  6215. bugfix on 0.3.5.1-alpha.
  6216. o Minor bugfixes (pluggable transports):
  6217. - Tor now sets TOR_PT_EXIT_ON_STDIN_CLOSE=1 for client transports as
  6218. well as servers. Fixes bug 25614; bugfix on 0.2.7.1-alpha.
  6219. o Minor bugfixes (portability):
  6220. - Avoid crashing in our tor_vasprintf() implementation on systems
  6221. that define neither vasprintf() nor _vscprintf(). (This bug has
  6222. been here long enough that we question whether people are running
  6223. Tor on such systems, but we're applying the fix out of caution.)
  6224. Fixes bug 30561; bugfix on 0.2.8.2-alpha. Found and fixed by
  6225. Tobias Stoeckmann.
  6226. o Minor bugfixes (probability distributions):
  6227. - Refactor and improve parts of the probability distribution code
  6228. that made Coverity complain. Fixes bug 29805; bugfix
  6229. on 0.4.0.1-alpha.
  6230. o Minor bugfixes (python):
  6231. - Stop assuming that /usr/bin/python3 exists. For scripts that work
  6232. with python2, use /usr/bin/python. Otherwise, use /usr/bin/env
  6233. python3. Fixes bug 29913; bugfix on 0.2.5.3-alpha.
  6234. o Minor bugfixes (relay):
  6235. - When running as a relay, if IPv6Exit is set to 1 while ExitRelay
  6236. is auto, act as if ExitRelay is 1. Previously, we would ignore
  6237. IPv6Exit if ExitRelay was 0 or auto. Fixes bug 29613; bugfix on
  6238. 0.3.5.1-alpha. Patch by Neel Chauhan.
  6239. o Minor bugfixes (static analysis):
  6240. - Fix several spurious Coverity warnings about the unit tests, to
  6241. lower our chances of missing real warnings in the future. Fixes
  6242. bug 30150; bugfix on 0.3.5.1-alpha and various other Tor versions.
  6243. o Minor bugfixes (stats):
  6244. - When ExtraInfoStatistics is 0, stop including bandwidth usage
  6245. statistics, GeoIPFile hashes, ServerTransportPlugin lines, and
  6246. bridge statistics by country in extra-info documents. Fixes bug
  6247. 29018; bugfix on 0.2.4.1-alpha.
  6248. o Minor bugfixes (testing):
  6249. - Call setrlimit() to disable core dumps in test_bt_cl.c. Previously
  6250. we used `ulimit -c` in test_bt.sh, which violates POSIX shell
  6251. compatibility. Fixes bug 29061; bugfix on 0.3.5.1-alpha.
  6252. - Fix some incorrect code in the v3 onion service unit tests. Fixes
  6253. bug 29243; bugfix on 0.3.2.1-alpha.
  6254. - In the "routerkeys/*" tests, check the return values of mkdir()
  6255. for possible failures. Fixes bug 29939; bugfix on 0.2.7.2-alpha.
  6256. Found by Coverity as CID 1444254.
  6257. - Split test_utils_general() into several smaller test functions.
  6258. This makes it easier to perform resource deallocation on assert
  6259. failure, and fixes Coverity warnings CID 1444117 and CID 1444118.
  6260. Fixes bug 29823; bugfix on 0.2.9.1-alpha.
  6261. o Minor bugfixes (tor-resolve):
  6262. - Fix a memory leak in tor-resolve that could happen if Tor gave it
  6263. a malformed SOCKS response. (Memory leaks in tor-resolve don't
  6264. actually matter, but it's good to fix them anyway.) Fixes bug
  6265. 30151; bugfix on 0.4.0.1-alpha.
  6266. o Code simplification and refactoring:
  6267. - Abstract out the low-level formatting of replies on the control
  6268. port. Implements ticket 30007.
  6269. - Add several assertions in an attempt to fix some Coverity
  6270. warnings. Closes ticket 30149.
  6271. - Introduce a connection_dir_buf_add() helper function that checks
  6272. for compress_state of dir_connection_t and automatically writes a
  6273. string to directory connection with or without compression.
  6274. Resolves issue 28816.
  6275. - Make the base32_decode() API return the number of bytes written,
  6276. for consistency with base64_decode(). Closes ticket 28913.
  6277. - Move most relay-only periodic events out of mainloop.c into the
  6278. relay subsystem. Closes ticket 30414.
  6279. - Refactor and encapsulate parts of the codebase that manipulate
  6280. crypt_path_t objects. Resolves issue 30236.
  6281. - Refactor several places in our code that Coverity incorrectly
  6282. believed might have memory leaks. Closes ticket 30147.
  6283. - Remove redundant return values in crypto_format, and the
  6284. associated return value checks elsewhere in the code. Make the
  6285. implementations in crypto_format consistent, and remove redundant
  6286. code. Resolves ticket 29660.
  6287. - Rename tor_mem_is_zero() to fast_mem_is_zero(), to emphasize that
  6288. it is not a constant-time function. Closes ticket 30309.
  6289. - Replace hs_desc_link_specifier_t with link_specifier_t, and remove
  6290. all hs_desc_link_specifier_t-specific code. Fixes bug 22781;
  6291. bugfix on 0.3.2.1-alpha.
  6292. - Simplify v3 onion service link specifier handling code. Fixes bug
  6293. 23576; bugfix on 0.3.2.1-alpha.
  6294. - Split crypto_digest.c into NSS code, OpenSSL code, and shared
  6295. code. Resolves ticket 29108.
  6296. - Split control.c into several submodules, in preparation for
  6297. distributing its current responsibilities throughout the codebase.
  6298. Closes ticket 29894.
  6299. - Start to move responsibility for knowing about periodic events to
  6300. the appropriate subsystems, so that the mainloop doesn't need to
  6301. know all the periodic events in the rest of the codebase.
  6302. Implements tickets 30293 and 30294.
  6303. o Documentation:
  6304. - Mention URLs for Travis/Appveyor/Jenkins in ReleasingTor.md.
  6305. Closes ticket 30630.
  6306. - Document how to find git commits and tags for bug fixes in
  6307. CodingStandards.md. Update some file documentation. Closes
  6308. ticket 30261.
  6309. o Removed features:
  6310. - Remove the linux-tor-prio.sh script from contrib/operator-tools
  6311. directory. Resolves issue 29434.
  6312. - Remove the obsolete OpenSUSE initscript. Resolves issue 30076.
  6313. - Remove the obsolete script at contrib/dist/tor.sh.in. Resolves
  6314. issue 30075.
  6315. o Testing:
  6316. - Specify torrc paths (with empty files) when launching tor in
  6317. integration tests; refrain from reading user and system torrcs.
  6318. Resolves issue 29702.
  6319. o Code simplification and refactoring (shell scripts):
  6320. - Clean up many of our shell scripts to fix shellcheck warnings.
  6321. These include autogen.sh (ticket 26069), test_keygen.sh (ticket
  6322. 29062), test_switch_id.sh (ticket 29065), test_rebind.sh (ticket
  6323. 29063), src/test/fuzz/minimize.sh (ticket 30079), test_rust.sh
  6324. (ticket 29064), torify (ticket 29070), asciidoc-helper.sh (29926),
  6325. fuzz_multi.sh (30077), fuzz_static_testcases.sh (ticket 29059),
  6326. nagios-check-tor-authority-cert (ticket 29071),
  6327. src/test/fuzz/fixup_filenames.sh (ticket 30078), test-network.sh
  6328. (ticket 29060), test_key_expiration.sh (ticket 30002),
  6329. zero_length_keys.sh (ticket 29068), and test_workqueue_*.sh
  6330. (ticket 29067).
  6331. o Testing (chutney):
  6332. - In "make test-network-all", test IPv6-only v3 single onion
  6333. services, using the chutney network single-onion-v23-ipv6-md.
  6334. Closes ticket 27251.
  6335. o Testing (continuous integration):
  6336. - In Travis, make stem log a controller trace to the console, and tail
  6337. stem's tor log after failure. Closes ticket 30591.
  6338. - In Travis, only run the stem tests that use a tor binary.
  6339. Closes ticket 30694.
  6340. Changes in version 0.4.0.5 - 2019-05-02
  6341. This is the first stable release in the 0.4.0.x series. It contains
  6342. improvements for power management and bootstrap reporting, as well as
  6343. preliminary backend support for circuit padding to prevent some kinds
  6344. of traffic analysis. It also continues our work in refactoring Tor for
  6345. long-term maintainability.
  6346. Per our support policy, we will support the 0.4.0.x series for nine
  6347. months, or until three months after the release of a stable 0.4.1.x:
  6348. whichever is longer. If you need longer-term support, please stick
  6349. with 0.3.5.x, which will we plan to support until Feb 2022.
  6350. Below are the changes since 0.3.5.7. For a complete list of changes
  6351. since 0.4.0.4-rc, see the ChangeLog file.
  6352. o Major features (battery management, client, dormant mode):
  6353. - When Tor is running as a client, and it is unused for a long time,
  6354. it can now enter a "dormant" state. When Tor is dormant, it avoids
  6355. network and CPU activity until it is reawoken either by a user
  6356. request or by a controller command. For more information, see the
  6357. configuration options starting with "Dormant". Implements tickets
  6358. 2149 and 28335.
  6359. - The client's memory of whether it is "dormant", and how long it
  6360. has spent idle, persists across invocations. Implements
  6361. ticket 28624.
  6362. - There is a DormantOnFirstStartup option that integrators can use
  6363. if they expect that in many cases, Tor will be installed but
  6364. not used.
  6365. o Major features (bootstrap reporting):
  6366. - When reporting bootstrap progress, report the first connection
  6367. uniformly, regardless of whether it's a connection for building
  6368. application circuits. This allows finer-grained reporting of early
  6369. progress than previously possible, with the improvements of ticket
  6370. 27169. Closes tickets 27167 and 27103. Addresses ticket 27308.
  6371. - When reporting bootstrap progress, treat connecting to a proxy or
  6372. pluggable transport as separate from having successfully used that
  6373. proxy or pluggable transport to connect to a relay. Closes tickets
  6374. 27100 and 28884.
  6375. o Major features (circuit padding):
  6376. - Implement preliminary support for the circuit padding portion of
  6377. Proposal 254. The implementation supports Adaptive Padding (aka
  6378. WTF-PAD) state machines for use between experimental clients and
  6379. relays. Support is also provided for APE-style state machines that
  6380. use probability distributions instead of histograms to specify
  6381. inter-packet delay. At the moment, Tor does not provide any
  6382. padding state machines that are used in normal operation: for now,
  6383. this feature exists solely for experimentation. Closes
  6384. ticket 28142.
  6385. o Major features (refactoring):
  6386. - Tor now uses an explicit list of its own subsystems when
  6387. initializing and shutting down. Previously, these systems were
  6388. managed implicitly in various places throughout the codebase.
  6389. (There may still be some subsystems using the old system.) Closes
  6390. ticket 28330.
  6391. o Major bugfixes (cell scheduler, KIST, security):
  6392. - Make KIST consider the outbuf length when computing what it can
  6393. put in the outbuf. Previously, KIST acted as though the outbuf
  6394. were empty, which could lead to the outbuf becoming too full. It
  6395. is possible that an attacker could exploit this bug to cause a Tor
  6396. client or relay to run out of memory and crash. Fixes bug 29168;
  6397. bugfix on 0.3.2.1-alpha. This issue is also being tracked as
  6398. TROVE-2019-001 and CVE-2019-8955.
  6399. o Major bugfixes (networking):
  6400. - Gracefully handle empty username/password fields in SOCKS5
  6401. username/password auth message and allow SOCKS5 handshake to
  6402. continue. Previously, we had rejected these handshakes, breaking
  6403. certain applications. Fixes bug 29175; bugfix on 0.3.5.1-alpha.
  6404. o Major bugfixes (NSS, relay):
  6405. - When running with NSS, disable TLS 1.2 ciphersuites that use
  6406. SHA384 for their PRF. Due to an NSS bug, the TLS key exporters for
  6407. these ciphersuites don't work -- which caused relays to fail to
  6408. handshake with one another when these ciphersuites were enabled.
  6409. Fixes bug 29241; bugfix on 0.3.5.1-alpha.
  6410. o Minor features (address selection):
  6411. - Treat the subnet 100.64.0.0/10 as public for some purposes;
  6412. private for others. This subnet is the RFC 6598 (Carrier Grade
  6413. NAT) IP range, and is deployed by many ISPs as an alternative to
  6414. RFC 1918 that does not break existing internal networks. Tor now
  6415. blocks SOCKS and control ports on these addresses and warns users
  6416. if client ports or ExtORPorts are listening on a RFC 6598 address.
  6417. Closes ticket 28525. Patch by Neel Chauhan.
  6418. o Minor features (bandwidth authority):
  6419. - Make bandwidth authorities ignore relays that are reported in the
  6420. bandwidth file with the flag "vote=0". This change allows us to
  6421. report unmeasured relays for diagnostic reasons without including
  6422. their bandwidth in the bandwidth authorities' vote. Closes
  6423. ticket 29806.
  6424. - When a directory authority is using a bandwidth file to obtain the
  6425. bandwidth values that will be included in the next vote, serve
  6426. this bandwidth file at /tor/status-vote/next/bandwidth. Closes
  6427. ticket 21377.
  6428. o Minor features (bootstrap reporting):
  6429. - When reporting bootstrap progress, stop distinguishing between
  6430. situations where only internal paths are available and situations
  6431. where external paths are available. Previously, Tor would often
  6432. erroneously report that it had only internal paths. Closes
  6433. ticket 27402.
  6434. o Minor features (compilation):
  6435. - Compile correctly when OpenSSL is built with engine support
  6436. disabled, or with deprecated APIs disabled. Closes ticket 29026.
  6437. Patches from "Mangix".
  6438. o Minor features (continuous integration):
  6439. - On Travis Rust builds, cleanup Rust registry and refrain from
  6440. caching the "target/" directory to speed up builds. Resolves
  6441. issue 29962.
  6442. - Log Python version during each Travis CI job. Resolves
  6443. issue 28551.
  6444. - In Travis, tell timelimit to use stem's backtrace signals, and
  6445. launch python directly from timelimit, so python receives the
  6446. signals from timelimit, rather than make. Closes ticket 30117.
  6447. o Minor features (controller):
  6448. - Add a DROPOWNERSHIP command to undo the effects of TAKEOWNERSHIP.
  6449. Implements ticket 28843.
  6450. o Minor features (developer tooling):
  6451. - Check that bugfix versions in changes files look like Tor versions
  6452. from the versions spec. Warn when bugfixes claim to be on a future
  6453. release. Closes ticket 27761.
  6454. - Provide a git pre-commit hook that disallows committing if we have
  6455. any failures in our code and changelog formatting checks. It is
  6456. now available in scripts/maint/pre-commit.git-hook. Implements
  6457. feature 28976.
  6458. - Provide a git hook script to prevent "fixup!" and "squash!"
  6459. commits from ending up in the master branch, as scripts/main/pre-
  6460. push.git-hook. Closes ticket 27993.
  6461. o Minor features (diagnostic):
  6462. - Add more diagnostic log messages in an attempt to solve the issue
  6463. of NUL bytes appearing in a microdescriptor cache. Related to
  6464. ticket 28223.
  6465. o Minor features (directory authority):
  6466. - When a directory authority is using a bandwidth file to obtain
  6467. bandwidth values, include the digest of that file in the vote.
  6468. Closes ticket 26698.
  6469. - Directory authorities support a new consensus algorithm, under
  6470. which the family lines in microdescriptors are encoded in a
  6471. canonical form. This change makes family lines more compressible
  6472. in transit, and on the client. Closes ticket 28266; implements
  6473. proposal 298.
  6474. o Minor features (directory authority, relay):
  6475. - Authorities now vote on a "StaleDesc" flag to indicate that a
  6476. relay's descriptor is so old that the relay should upload again
  6477. soon. Relays treat this flag as a signal to upload a new
  6478. descriptor. This flag will eventually let us remove the
  6479. 'published' date from routerstatus entries, and make our consensus
  6480. diffs much smaller. Closes ticket 26770; implements proposal 293.
  6481. o Minor features (dormant mode):
  6482. - Add a DormantCanceledByStartup option to tell Tor that it should
  6483. treat a startup event as cancelling any previous dormant state.
  6484. Integrators should use this option with caution: it should only be
  6485. used if Tor is being started because of something that the user
  6486. did, and not if Tor is being automatically started in the
  6487. background. Closes ticket 29357.
  6488. o Minor features (fallback directory mirrors):
  6489. - Update the fallback whitelist based on operator opt-ins and opt-
  6490. outs. Closes ticket 24805, patch by Phoul.
  6491. o Minor features (FreeBSD):
  6492. - On FreeBSD-based systems, warn relay operators if the
  6493. "net.inet.ip.random_id" sysctl (IP ID randomization) is disabled.
  6494. Closes ticket 28518.
  6495. o Minor features (geoip):
  6496. - Update geoip and geoip6 to the April 2 2019 Maxmind GeoLite2
  6497. Country database. Closes ticket 29992.
  6498. o Minor features (HTTP standards compliance):
  6499. - Stop sending the header "Content-type: application/octet-stream"
  6500. along with transparently compressed documents: this confused
  6501. browsers. Closes ticket 28100.
  6502. o Minor features (IPv6):
  6503. - We add an option ClientAutoIPv6ORPort, to make clients randomly
  6504. prefer a node's IPv4 or IPv6 ORPort. The random preference is set
  6505. every time a node is loaded from a new consensus or bridge config.
  6506. We expect that this option will enable clients to bootstrap more
  6507. quickly without having to determine whether they support IPv4,
  6508. IPv6, or both. Closes ticket 27490. Patch by Neel Chauhan.
  6509. - When using addrs_in_same_network_family(), avoid choosing circuit
  6510. paths that pass through the same IPv6 subnet more than once.
  6511. Previously, we only checked IPv4 subnets. Closes ticket 24393.
  6512. Patch by Neel Chauhan.
  6513. o Minor features (log messages):
  6514. - Improve log message in v3 onion services that could print out
  6515. negative revision counters. Closes ticket 27707. Patch
  6516. by "ffmancera".
  6517. o Minor features (memory usage):
  6518. - Save memory by storing microdescriptor family lists with a more
  6519. compact representation. Closes ticket 27359.
  6520. - Tor clients now use mmap() to read consensus files from disk, so
  6521. that they no longer need keep the full text of a consensus in
  6522. memory when parsing it or applying a diff. Closes ticket 27244.
  6523. o Minor features (NSS, diagnostic):
  6524. - Try to log an error from NSS (if there is any) and a more useful
  6525. description of our situation if we are using NSS and a call to
  6526. SSL_ExportKeyingMaterial() fails. Diagnostic for ticket 29241.
  6527. o Minor features (parsing):
  6528. - Directory authorities now validate that router descriptors and
  6529. ExtraInfo documents are in a valid subset of UTF-8, and reject
  6530. them if they are not. Closes ticket 27367.
  6531. o Minor features (performance):
  6532. - Cache the results of summarize_protocol_flags(), so that we don't
  6533. have to parse the same protocol-versions string over and over.
  6534. This should save us a huge number of malloc calls on startup, and
  6535. may reduce memory fragmentation with some allocators. Closes
  6536. ticket 27225.
  6537. - Remove a needless memset() call from get_token_arguments, thereby
  6538. speeding up the tokenization of directory objects by about 20%.
  6539. Closes ticket 28852.
  6540. - Replace parse_short_policy() with a faster implementation, to
  6541. improve microdescriptor parsing time. Closes ticket 28853.
  6542. - Speed up directory parsing a little by avoiding use of the non-
  6543. inlined strcmp_len() function. Closes ticket 28856.
  6544. - Speed up microdescriptor parsing by about 30%, to help improve
  6545. startup time. Closes ticket 28839.
  6546. o Minor features (pluggable transports):
  6547. - Add support for emitting STATUS updates to Tor's control port from
  6548. a pluggable transport process. Closes ticket 28846.
  6549. - Add support for logging to Tor's logging subsystem from a
  6550. pluggable transport process. Closes ticket 28180.
  6551. o Minor features (process management):
  6552. - Add a new process API for handling child processes. This new API
  6553. allows Tor to have bi-directional communication with child
  6554. processes on both Unix and Windows. Closes ticket 28179.
  6555. - Use the subsystem manager to initialize and shut down the process
  6556. module. Closes ticket 28847.
  6557. o Minor features (relay):
  6558. - When listing relay families, list them in canonical form including
  6559. the relay's own identity, and try to give a more useful set of
  6560. warnings. Part of ticket 28266 and proposal 298.
  6561. o Minor features (required protocols):
  6562. - Before exiting because of a missing required protocol, Tor will
  6563. now check the publication time of the consensus, and not exit
  6564. unless the consensus is newer than the Tor program's own release
  6565. date. Previously, Tor would not check the consensus publication
  6566. time, and so might exit because of a missing protocol that might
  6567. no longer be required in a current consensus. Implements proposal
  6568. 297; closes ticket 27735.
  6569. o Minor features (testing):
  6570. - Treat all unexpected ERR and BUG messages as test failures. Closes
  6571. ticket 28668.
  6572. - Allow a HeartbeatPeriod of less than 30 minutes in testing Tor
  6573. networks. Closes ticket 28840. Patch by Rob Jansen.
  6574. - Use the approx_time() function when setting the "Expires" header
  6575. in directory replies, to make them more testable. Needed for
  6576. ticket 30001.
  6577. o Minor bugfixes (security):
  6578. - Fix a potential double free bug when reading huge bandwidth files.
  6579. The issue is not exploitable in the current Tor network because
  6580. the vulnerable code is only reached when directory authorities
  6581. read bandwidth files, but bandwidth files come from a trusted
  6582. source (usually the authorities themselves). Furthermore, the
  6583. issue is only exploitable in rare (non-POSIX) 32-bit architectures,
  6584. which are not used by any of the current authorities. Fixes bug
  6585. 30040; bugfix on 0.3.5.1-alpha. Bug found and fixed by
  6586. Tobias Stoeckmann.
  6587. - Verify in more places that we are not about to create a buffer
  6588. with more than INT_MAX bytes, to avoid possible OOB access in the
  6589. event of bugs. Fixes bug 30041; bugfix on 0.2.0.16. Found and
  6590. fixed by Tobias Stoeckmann.
  6591. o Minor bugfix (continuous integration):
  6592. - Reset coverage state on disk after Travis CI has finished. This
  6593. should prevent future coverage merge errors from causing the test
  6594. suite for the "process" subsystem to fail. The process subsystem
  6595. was introduced in 0.4.0.1-alpha. Fixes bug 29036; bugfix
  6596. on 0.2.9.15.
  6597. - Terminate test-stem if it takes more than 9.5 minutes to run.
  6598. (Travis terminates the job after 10 minutes of no output.)
  6599. Diagnostic for 29437. Fixes bug 30011; bugfix on 0.3.5.4-alpha.
  6600. o Minor bugfixes (build, compatibility, rust):
  6601. - Update Cargo.lock file to match the version made by the latest
  6602. version of Rust, so that "make distcheck" will pass again. Fixes
  6603. bug 29244; bugfix on 0.3.3.4-alpha.
  6604. o Minor bugfixes (C correctness):
  6605. - Fix an unlikely memory leak in consensus_diff_apply(). Fixes bug
  6606. 29824; bugfix on 0.3.1.1-alpha. This is Coverity warning
  6607. CID 1444119.
  6608. o Minor bugfixes (client, clock skew):
  6609. - Bootstrap successfully even when Tor's clock is behind the clocks
  6610. on the authorities. Fixes bug 28591; bugfix on 0.2.0.9-alpha.
  6611. - Select guards even if the consensus has expired, as long as the
  6612. consensus is still reasonably live. Fixes bug 24661; bugfix
  6613. on 0.3.0.1-alpha.
  6614. o Minor bugfixes (compilation):
  6615. - Silence a compiler warning in test-memwipe.c on OpenBSD. Fixes bug
  6616. 29145; bugfix on 0.2.9.3-alpha. Patch from Kris Katterjohn.
  6617. - Compile correctly on OpenBSD; previously, we were missing some
  6618. headers required in order to detect it properly. Fixes bug 28938;
  6619. bugfix on 0.3.5.1-alpha. Patch from Kris Katterjohn.
  6620. o Minor bugfixes (directory clients):
  6621. - Mark outdated dirservers when Tor only has a reasonably live
  6622. consensus. Fixes bug 28569; bugfix on 0.3.2.5-alpha.
  6623. o Minor bugfixes (directory mirrors):
  6624. - Even when a directory mirror's clock is behind the clocks on the
  6625. authorities, we now allow the mirror to serve "future"
  6626. consensuses. Fixes bug 28654; bugfix on 0.3.0.1-alpha.
  6627. o Minor bugfixes (DNS):
  6628. - Gracefully handle an empty or absent resolve.conf file by falling
  6629. back to using "localhost" as a DNS server (and hoping it works).
  6630. Previously, we would just stop running as an exit. Fixes bug
  6631. 21900; bugfix on 0.2.1.10-alpha.
  6632. o Minor bugfixes (documentation):
  6633. - Describe the contents of the v3 onion service client authorization
  6634. files correctly: They hold public keys, not private keys. Fixes
  6635. bug 28979; bugfix on 0.3.5.1-alpha. Spotted by "Felixix".
  6636. o Minor bugfixes (guards):
  6637. - In count_acceptable_nodes(), the minimum number is now one bridge
  6638. or guard node, and two non-guard nodes for a circuit. Previously,
  6639. we had added up the sum of all nodes with a descriptor, but that
  6640. could cause us to build failing circuits when we had either too
  6641. many bridges or not enough guard nodes. Fixes bug 25885; bugfix on
  6642. 0.2.3.1-alpha. Patch by Neel Chauhan.
  6643. o Minor bugfixes (IPv6):
  6644. - Fix tor_ersatz_socketpair on IPv6-only systems. Previously, the
  6645. IPv6 socket was bound using an address family of AF_INET instead
  6646. of AF_INET6. Fixes bug 28995; bugfix on 0.3.5.1-alpha. Patch from
  6647. Kris Katterjohn.
  6648. o Minor bugfixes (logging):
  6649. - Correct a misleading error message when IPv4Only or IPv6Only is
  6650. used but the resolved address can not be interpreted as an address
  6651. of the specified IP version. Fixes bug 13221; bugfix on
  6652. 0.2.3.9-alpha. Patch from Kris Katterjohn.
  6653. - Log the correct port number for listening sockets when "auto" is
  6654. used to let Tor pick the port number. Previously, port 0 was
  6655. logged instead of the actual port number. Fixes bug 29144; bugfix
  6656. on 0.3.5.1-alpha. Patch from Kris Katterjohn.
  6657. - Stop logging a BUG() warning when Tor is waiting for exit
  6658. descriptors. Fixes bug 28656; bugfix on 0.3.5.1-alpha.
  6659. - Avoid logging that we are relaxing a circuit timeout when that
  6660. timeout is fixed. Fixes bug 28698; bugfix on 0.2.4.7-alpha.
  6661. - Log more information at "warning" level when unable to read a
  6662. private key; log more information at "info" level when unable to
  6663. read a public key. We had warnings here before, but they were lost
  6664. during our NSS work. Fixes bug 29042; bugfix on 0.3.5.1-alpha.
  6665. - Rework rep_hist_log_link_protocol_counts() to iterate through all
  6666. link protocol versions when logging incoming/outgoing connection
  6667. counts. Tor no longer skips version 5, and we won't have to
  6668. remember to update this function when new link protocol version is
  6669. developed. Fixes bug 28920; bugfix on 0.2.6.10.
  6670. o Minor bugfixes (memory management):
  6671. - Refactor the shared random state's memory management so that it
  6672. actually takes ownership of the shared random value pointers.
  6673. Fixes bug 29706; bugfix on 0.2.9.1-alpha.
  6674. - Stop leaking parts of the shared random state in the shared-random
  6675. unit tests. Fixes bug 29599; bugfix on 0.2.9.1-alpha.
  6676. o Minor bugfixes (misc):
  6677. - The amount of total available physical memory is now determined
  6678. using the sysctl identifier HW_PHYSMEM (rather than HW_USERMEM)
  6679. when it is defined and a 64-bit variant is not available. Fixes
  6680. bug 28981; bugfix on 0.2.5.4-alpha. Patch from Kris Katterjohn.
  6681. o Minor bugfixes (networking):
  6682. - Introduce additional checks into tor_addr_parse() to reject
  6683. certain incorrect inputs that previously were not detected. Fixes
  6684. bug 23082; bugfix on 0.2.0.10-alpha.
  6685. o Minor bugfixes (onion service v3, client):
  6686. - Stop logging a "BUG()" warning and stacktrace when we find a SOCKS
  6687. connection waiting for a descriptor that we actually have in the
  6688. cache. It turns out that this can actually happen, though it is
  6689. rare. Now, tor will recover and retry the descriptor. Fixes bug
  6690. 28669; bugfix on 0.3.2.4-alpha.
  6691. o Minor bugfixes (onion services):
  6692. - Avoid crashing if ClientOnionAuthDir (incorrectly) contains more
  6693. than one private key for a hidden service. Fixes bug 29040; bugfix
  6694. on 0.3.5.1-alpha.
  6695. - In hs_cache_store_as_client() log an HSDesc we failed to parse at
  6696. "debug" level. Tor used to log it as a warning, which caused very
  6697. long log lines to appear for some users. Fixes bug 29135; bugfix
  6698. on 0.3.2.1-alpha.
  6699. - Stop logging "Tried to establish rendezvous on non-OR circuit..."
  6700. as a warning. Instead, log it as a protocol warning, because there
  6701. is nothing that relay operators can do to fix it. Fixes bug 29029;
  6702. bugfix on 0.2.5.7-rc.
  6703. o Minor bugfixes (periodic events):
  6704. - Refrain from calling routerlist_remove_old_routers() from
  6705. check_descriptor_callback(). Instead, create a new hourly periodic
  6706. event. Fixes bug 27929; bugfix on 0.2.8.1-alpha.
  6707. o Minor bugfixes (pluggable transports):
  6708. - Make sure that data is continously read from standard output and
  6709. standard error pipes of a pluggable transport child-process, to
  6710. avoid deadlocking when a pipe's buffer is full. Fixes bug 26360;
  6711. bugfix on 0.2.3.6-alpha.
  6712. o Minor bugfixes (rust):
  6713. - Abort on panic in all build profiles, instead of potentially
  6714. unwinding into C code. Fixes bug 27199; bugfix on 0.3.3.1-alpha.
  6715. o Minor bugfixes (scheduler):
  6716. - When re-adding channels to the pending list, check the correct
  6717. channel's sched_heap_idx. This issue has had no effect in mainline
  6718. Tor, but could have led to bugs down the road in improved versions
  6719. of our circuit scheduling code. Fixes bug 29508; bugfix
  6720. on 0.3.2.10.
  6721. o Minor bugfixes (single onion services):
  6722. - Allow connections to single onion services to remain idle without
  6723. being disconnected. Previously, relays acting as rendezvous points
  6724. for single onion services were mistakenly closing idle rendezvous
  6725. circuits after 60 seconds, thinking that they were unused
  6726. directory-fetching circuits that had served their purpose. Fixes
  6727. bug 29665; bugfix on 0.2.1.26.
  6728. o Minor bugfixes (stats):
  6729. - When ExtraInfoStatistics is 0, stop including PaddingStatistics in
  6730. relay and bridge extra-info documents. Fixes bug 29017; bugfix
  6731. on 0.3.1.1-alpha.
  6732. o Minor bugfixes (testing):
  6733. - Backport the 0.3.4 src/test/test-network.sh to 0.2.9. We need a
  6734. recent test-network.sh to use new chutney features in CI. Fixes
  6735. bug 29703; bugfix on 0.2.9.1-alpha.
  6736. - Fix a test failure on Windows caused by an unexpected "BUG"
  6737. warning in our tests for tor_gmtime_r(-1). Fixes bug 29922; bugfix
  6738. on 0.2.9.3-alpha.
  6739. - Downgrade some LOG_ERR messages in the address/* tests to
  6740. warnings. The LOG_ERR messages were occurring when we had no
  6741. configured network. We were failing the unit tests, because we
  6742. backported 28668 to 0.3.5.8, but did not backport 29530. Fixes bug
  6743. 29530; bugfix on 0.3.5.8.
  6744. - Fix our gcov wrapper script to look for object files at the
  6745. correct locations. Fixes bug 29435; bugfix on 0.3.5.1-alpha.
  6746. - Detect and suppress "bug" warnings from the util/time test on
  6747. Windows. Fixes bug 29161; bugfix on 0.2.9.3-alpha.
  6748. - Do not log an error-level message if we fail to find an IPv6
  6749. network interface from the unit tests. Fixes bug 29160; bugfix
  6750. on 0.2.7.3-rc.
  6751. - Instead of relying on hs_free_all() to clean up all onion service
  6752. objects in test_build_descriptors(), we now deallocate them one by
  6753. one. This lets Coverity know that we are not leaking memory there
  6754. and fixes CID 1442277. Fixes bug 28989; bugfix on 0.3.5.1-alpha.
  6755. o Minor bugfixes (TLS protocol):
  6756. - When classifying a client's selection of TLS ciphers, if the
  6757. client ciphers are not yet available, do not cache the result.
  6758. Previously, we had cached the unavailability of the cipher list
  6759. and never looked again, which in turn led us to assume that the
  6760. client only supported the ancient V1 link protocol. This, in turn,
  6761. was causing Stem integration tests to stall in some cases. Fixes
  6762. bug 30021; bugfix on 0.2.4.8-alpha.
  6763. o Minor bugfixes (usability):
  6764. - Stop saying "Your Guard ..." in pathbias_measure_{use,close}_rate().
  6765. Some users took this phrasing to mean that the mentioned guard was
  6766. under their control or responsibility, which it is not. Fixes bug
  6767. 28895; bugfix on Tor 0.3.0.1-alpha.
  6768. o Minor bugfixes (Windows, CI):
  6769. - Skip the Appveyor 32-bit Windows Server 2016 job, and 64-bit
  6770. Windows Server 2012 R2 job. The remaining 2 jobs still provide
  6771. coverage of 64/32-bit, and Windows Server 2016/2012 R2. Also set
  6772. fast_finish, so failed jobs terminate the build immediately. Fixes
  6773. bug 29601; bugfix on 0.3.5.4-alpha.
  6774. o Code simplification and refactoring:
  6775. - Introduce a connection_dir_buf_add() helper function that detects
  6776. whether compression is in use, and adds a string accordingly.
  6777. Resolves issue 28816.
  6778. - Refactor handle_get_next_bandwidth() to use
  6779. connection_dir_buf_add(). Implements ticket 29897.
  6780. - Reimplement NETINFO cell parsing and generation to rely on
  6781. trunnel-generated wire format handling code. Closes ticket 27325.
  6782. - Remove unnecessary unsafe code from the Rust macro "cstr!". Closes
  6783. ticket 28077.
  6784. - Rework SOCKS wire format handling to rely on trunnel-generated
  6785. parsing/generation code. Resolves ticket 27620.
  6786. - Split out bootstrap progress reporting from control.c into a
  6787. separate file. Part of ticket 27402.
  6788. - The .may_include files that we use to describe our directory-by-
  6789. directory dependency structure now describe a noncircular
  6790. dependency graph over the directories that they cover. Our
  6791. checkIncludes.py tool now enforces this noncircularity. Closes
  6792. ticket 28362.
  6793. o Documentation:
  6794. - Clarify that Tor performs stream isolation among *Port listeners
  6795. by default. Resolves issue 29121.
  6796. - In the manpage entry describing MapAddress torrc setting, use
  6797. example IP addresses from ranges specified for use in documentation
  6798. by RFC 5737. Resolves issue 28623.
  6799. - Mention that you cannot add a new onion service if Tor is already
  6800. running with Sandbox enabled. Closes ticket 28560.
  6801. - Improve ControlPort documentation. Mention that it accepts
  6802. address:port pairs, and can be used multiple times. Closes
  6803. ticket 28805.
  6804. - Document the exact output of "tor --version". Closes ticket 28889.
  6805. o Removed features:
  6806. - Remove the old check-tor script. Resolves issue 29072.
  6807. - Stop responding to the 'GETINFO status/version/num-concurring' and
  6808. 'GETINFO status/version/num-versioning' control port commands, as
  6809. those were deprecated back in 0.2.0.30. Also stop listing them in
  6810. output of 'GETINFO info/names'. Resolves ticket 28757.
  6811. - The scripts used to generate and maintain the list of fallback
  6812. directories have been extracted into a new "fallback-scripts"
  6813. repository. Closes ticket 27914.
  6814. o Testing:
  6815. - Run shellcheck for scripts in the in scripts/ directory. Closes
  6816. ticket 28058.
  6817. - Add unit tests for tokenize_string() and get_next_token()
  6818. functions. Resolves ticket 27625.
  6819. o Code simplification and refactoring (onion service v3):
  6820. - Consolidate the authorized client descriptor cookie computation
  6821. code from client and service into one function. Closes
  6822. ticket 27549.
  6823. o Code simplification and refactoring (shell scripts):
  6824. - Cleanup scan-build.sh to silence shellcheck warnings. Closes
  6825. ticket 28007.
  6826. - Fix issues that shellcheck found in chutney-git-bisect.sh.
  6827. Resolves ticket 28006.
  6828. - Fix issues that shellcheck found in updateRustDependencies.sh.
  6829. Resolves ticket 28012.
  6830. - Fix shellcheck warnings in cov-diff script. Resolves issue 28009.
  6831. - Fix shellcheck warnings in run_calltool.sh. Resolves ticket 28011.
  6832. - Fix shellcheck warnings in run_trunnel.sh. Resolves issue 28010.
  6833. - Fix shellcheck warnings in scripts/test/coverage. Resolves
  6834. issue 28008.
  6835. Changes in version 0.3.5.8 - 2019-02-21
  6836. Tor 0.3.5.8 backports several fixes from later releases, including fixes
  6837. for an annoying SOCKS-parsing bug that affected users in earlier 0.3.5.x
  6838. releases.
  6839. It also includes a fix for a medium-severity security bug affecting Tor
  6840. 0.3.2.1-alpha and later. All Tor instances running an affected release
  6841. should upgrade to 0.3.3.12, 0.3.4.11, 0.3.5.8, or 0.4.0.2-alpha.
  6842. o Major bugfixes (cell scheduler, KIST, security):
  6843. - Make KIST consider the outbuf length when computing what it can
  6844. put in the outbuf. Previously, KIST acted as though the outbuf
  6845. were empty, which could lead to the outbuf becoming too full. It
  6846. is possible that an attacker could exploit this bug to cause a Tor
  6847. client or relay to run out of memory and crash. Fixes bug 29168;
  6848. bugfix on 0.3.2.1-alpha. This issue is also being tracked as
  6849. TROVE-2019-001 and CVE-2019-8955.
  6850. o Major bugfixes (networking, backport from 0.4.0.2-alpha):
  6851. - Gracefully handle empty username/password fields in SOCKS5
  6852. username/password auth messsage and allow SOCKS5 handshake to
  6853. continue. Previously, we had rejected these handshakes, breaking
  6854. certain applications. Fixes bug 29175; bugfix on 0.3.5.1-alpha.
  6855. o Minor features (compilation, backport from 0.4.0.2-alpha):
  6856. - Compile correctly when OpenSSL is built with engine support
  6857. disabled, or with deprecated APIs disabled. Closes ticket 29026.
  6858. Patches from "Mangix".
  6859. o Minor features (geoip):
  6860. - Update geoip and geoip6 to the February 5 2019 Maxmind GeoLite2
  6861. Country database. Closes ticket 29478.
  6862. o Minor features (testing, backport from 0.4.0.2-alpha):
  6863. - Treat all unexpected ERR and BUG messages as test failures. Closes
  6864. ticket 28668.
  6865. o Minor bugfixes (onion service v3, client, backport from 0.4.0.1-alpha):
  6866. - Stop logging a "BUG()" warning and stacktrace when we find a SOCKS
  6867. connection waiting for a descriptor that we actually have in the
  6868. cache. It turns out that this can actually happen, though it is
  6869. rare. Now, tor will recover and retry the descriptor. Fixes bug
  6870. 28669; bugfix on 0.3.2.4-alpha.
  6871. o Minor bugfixes (IPv6, backport from 0.4.0.1-alpha):
  6872. - Fix tor_ersatz_socketpair on IPv6-only systems. Previously, the
  6873. IPv6 socket was bound using an address family of AF_INET instead
  6874. of AF_INET6. Fixes bug 28995; bugfix on 0.3.5.1-alpha. Patch from
  6875. Kris Katterjohn.
  6876. o Minor bugfixes (build, compatibility, rust, backport from 0.4.0.2-alpha):
  6877. - Update Cargo.lock file to match the version made by the latest
  6878. version of Rust, so that "make distcheck" will pass again. Fixes
  6879. bug 29244; bugfix on 0.3.3.4-alpha.
  6880. o Minor bugfixes (client, clock skew, backport from 0.4.0.1-alpha):
  6881. - Select guards even if the consensus has expired, as long as the
  6882. consensus is still reasonably live. Fixes bug 24661; bugfix
  6883. on 0.3.0.1-alpha.
  6884. o Minor bugfixes (compilation, backport from 0.4.0.1-alpha):
  6885. - Compile correctly on OpenBSD; previously, we were missing some
  6886. headers required in order to detect it properly. Fixes bug 28938;
  6887. bugfix on 0.3.5.1-alpha. Patch from Kris Katterjohn.
  6888. o Minor bugfixes (documentation, backport from 0.4.0.2-alpha):
  6889. - Describe the contents of the v3 onion service client authorization
  6890. files correctly: They hold public keys, not private keys. Fixes
  6891. bug 28979; bugfix on 0.3.5.1-alpha. Spotted by "Felixix".
  6892. o Minor bugfixes (logging, backport from 0.4.0.1-alpha):
  6893. - Rework rep_hist_log_link_protocol_counts() to iterate through all
  6894. link protocol versions when logging incoming/outgoing connection
  6895. counts. Tor no longer skips version 5, and we won't have to
  6896. remember to update this function when new link protocol version is
  6897. developed. Fixes bug 28920; bugfix on 0.2.6.10.
  6898. o Minor bugfixes (logging, backport from 0.4.0.2-alpha):
  6899. - Log more information at "warning" level when unable to read a
  6900. private key; log more information at "info" level when unable to
  6901. read a public key. We had warnings here before, but they were lost
  6902. during our NSS work. Fixes bug 29042; bugfix on 0.3.5.1-alpha.
  6903. o Minor bugfixes (misc, backport from 0.4.0.2-alpha):
  6904. - The amount of total available physical memory is now determined
  6905. using the sysctl identifier HW_PHYSMEM (rather than HW_USERMEM)
  6906. when it is defined and a 64-bit variant is not available. Fixes
  6907. bug 28981; bugfix on 0.2.5.4-alpha. Patch from Kris Katterjohn.
  6908. o Minor bugfixes (onion services, backport from 0.4.0.2-alpha):
  6909. - Avoid crashing if ClientOnionAuthDir (incorrectly) contains more
  6910. than one private key for a hidden service. Fixes bug 29040; bugfix
  6911. on 0.3.5.1-alpha.
  6912. - In hs_cache_store_as_client() log an HSDesc we failed to parse at
  6913. "debug" level. Tor used to log it as a warning, which caused very
  6914. long log lines to appear for some users. Fixes bug 29135; bugfix
  6915. on 0.3.2.1-alpha.
  6916. - Stop logging "Tried to establish rendezvous on non-OR circuit..."
  6917. as a warning. Instead, log it as a protocol warning, because there
  6918. is nothing that relay operators can do to fix it. Fixes bug 29029;
  6919. bugfix on 0.2.5.7-rc.
  6920. o Minor bugfixes (tests, directory clients, backport from 0.4.0.1-alpha):
  6921. - Mark outdated dirservers when Tor only has a reasonably live
  6922. consensus. Fixes bug 28569; bugfix on 0.3.2.5-alpha.
  6923. o Minor bugfixes (tests, backport from 0.4.0.2-alpha):
  6924. - Detect and suppress "bug" warnings from the util/time test on
  6925. Windows. Fixes bug 29161; bugfix on 0.2.9.3-alpha.
  6926. - Do not log an error-level message if we fail to find an IPv6
  6927. network interface from the unit tests. Fixes bug 29160; bugfix
  6928. on 0.2.7.3-rc.
  6929. o Minor bugfixes (usability, backport from 0.4.0.1-alpha):
  6930. - Stop saying "Your Guard ..." in pathbias_measure_{use,close}_rate().
  6931. Some users took this phrasing to mean that the mentioned guard was
  6932. under their control or responsibility, which it is not. Fixes bug
  6933. 28895; bugfix on Tor 0.3.0.1-alpha.
  6934. Changes in version 0.3.4.11 - 2019-02-21
  6935. Tor 0.3.4.11 is the third stable release in its series. It includes
  6936. a fix for a medium-severity security bug affecting Tor 0.3.2.1-alpha and
  6937. later. All Tor instances running an affected release should upgrade to
  6938. 0.3.3.12, 0.3.4.11, 0.3.5.8, or 0.4.0.2-alpha.
  6939. o Major bugfixes (cell scheduler, KIST, security):
  6940. - Make KIST consider the outbuf length when computing what it can
  6941. put in the outbuf. Previously, KIST acted as though the outbuf
  6942. were empty, which could lead to the outbuf becoming too full. It
  6943. is possible that an attacker could exploit this bug to cause a Tor
  6944. client or relay to run out of memory and crash. Fixes bug 29168;
  6945. bugfix on 0.3.2.1-alpha. This issue is also being tracked as
  6946. TROVE-2019-001 and CVE-2019-8955.
  6947. o Minor features (geoip):
  6948. - Update geoip and geoip6 to the February 5 2019 Maxmind GeoLite2
  6949. Country database. Closes ticket 29478.
  6950. o Minor bugfixes (build, compatibility, rust, backport from 0.4.0.2-alpha):
  6951. - Update Cargo.lock file to match the version made by the latest
  6952. version of Rust, so that "make distcheck" will pass again. Fixes
  6953. bug 29244; bugfix on 0.3.3.4-alpha.
  6954. o Minor bugfixes (onion services, backport from 0.4.0.2-alpha):
  6955. - Stop logging "Tried to establish rendezvous on non-OR circuit..."
  6956. as a warning. Instead, log it as a protocol warning, because there
  6957. is nothing that relay operators can do to fix it. Fixes bug 29029;
  6958. bugfix on 0.2.5.7-rc.
  6959. Changes in version 0.3.3.12 - 2019-02-21
  6960. Tor 0.3.3.12 fixes a medium-severity security bug affecting Tor
  6961. 0.3.2.1-alpha and later. All Tor instances running an affected release
  6962. should upgrade to 0.3.3.12, 0.3.4.11, 0.3.5.8, or 0.4.0.2-alpha.
  6963. This release marks the end of support for the Tor 0.3.3.x series. We
  6964. recommend that users switch to either the Tor 0.3.4 series (supported
  6965. until at least 10 June 2019), or the Tor 0.3.5 series, which will
  6966. receive long-term support until at least 1 Feb 2022.
  6967. o Major bugfixes (cell scheduler, KIST, security):
  6968. - Make KIST consider the outbuf length when computing what it can
  6969. put in the outbuf. Previously, KIST acted as though the outbuf
  6970. were empty, which could lead to the outbuf becoming too full. It
  6971. is possible that an attacker could exploit this bug to cause a Tor
  6972. client or relay to run out of memory and crash. Fixes bug 29168;
  6973. bugfix on 0.3.2.1-alpha. This issue is also being tracked as
  6974. TROVE-2019-001 and CVE-2019-8955.
  6975. o Minor features (geoip):
  6976. - Update geoip and geoip6 to the February 5 2019 Maxmind GeoLite2
  6977. Country database. Closes ticket 29478.
  6978. o Minor bugfixes (build, compatibility, rust, backport from 0.4.0.2-alpha):
  6979. - Update Cargo.lock file to match the version made by the latest
  6980. version of Rust, so that "make distcheck" will pass again. Fixes
  6981. bug 29244; bugfix on 0.3.3.4-alpha.
  6982. o Minor bugfixes (onion services, backport from 0.4.0.2-alpha):
  6983. - Stop logging "Tried to establish rendezvous on non-OR circuit..."
  6984. as a warning. Instead, log it as a protocol warning, because there
  6985. is nothing that relay operators can do to fix it. Fixes bug 29029;
  6986. bugfix on 0.2.5.7-rc.
  6987. Changes in version 0.3.3.11 - 2019-01-07
  6988. Tor 0.3.3.11 backports numerous fixes from later versions of Tor.
  6989. numerous fixes, including an important fix for anyone using OpenSSL
  6990. 1.1.1. Anyone running an earlier version of Tor 0.3.3 should upgrade
  6991. to this version, or to a later series.
  6992. As a reminder, support the Tor 0.3.3 series will end on 22 Feb 2019.
  6993. We anticipate that this will be the last release of Tor 0.3.3, unless
  6994. some major bug is before then. Some time between now and then, users
  6995. should switch to either the Tor 0.3.4 series (supported until at least
  6996. 10 June 2019), or the Tor 0.3.5 series, which will receive long-term
  6997. support until at least 1 Feb 2022.
  6998. o Major bugfixes (OpenSSL, portability, backport from 0.3.5.5-alpha):
  6999. - Fix our usage of named groups when running as a TLS 1.3 client in
  7000. OpenSSL 1.1.1. Previously, we only initialized EC groups when
  7001. running as a relay, which caused clients to fail to negotiate TLS
  7002. 1.3 with relays. Fixes bug 28245; bugfix on 0.2.9.15 (when TLS 1.3
  7003. support was added).
  7004. o Major bugfixes (restart-in-process, backport from 0.3.5.1-alpha):
  7005. - Fix a use-after-free error that could be caused by passing Tor an
  7006. impossible set of options that would fail during options_act().
  7007. Fixes bug 27708; bugfix on 0.3.3.1-alpha.
  7008. o Minor features (continuous integration, backport from 0.3.5.1-alpha):
  7009. - Only run one online rust build in Travis, to reduce network
  7010. errors. Skip offline rust builds on Travis for Linux gcc, because
  7011. they're redundant. Implements ticket 27252.
  7012. - Skip gcc on OSX in Travis CI, because it's rarely used. Skip a
  7013. duplicate hardening-off build in Travis on Tor 0.2.9. Skip gcc on
  7014. Linux with default settings, because all the non-default builds
  7015. use gcc on Linux. Implements ticket 27252.
  7016. o Minor features (continuous integration, backport from 0.3.5.3-alpha):
  7017. - Use the Travis Homebrew addon to install packages on macOS during
  7018. Travis CI. The package list is the same, but the Homebrew addon
  7019. does not do a `brew update` by default. Implements ticket 27738.
  7020. o Minor features (fallback directory list, backport from 0.3.5.6-rc):
  7021. - Replace the 150 fallbacks originally introduced in Tor
  7022. 0.3.3.1-alpha in January 2018 (of which ~115 were still
  7023. functional), with a list of 157 fallbacks (92 new, 65 existing, 85
  7024. removed) generated in December 2018. Closes ticket 24803.
  7025. o Minor features (geoip):
  7026. - Update geoip and geoip6 to the January 3 2019 Maxmind GeoLite2
  7027. Country database. Closes ticket 29012.
  7028. o Minor features (OpenSSL bug workaround, backport from 0.3.5.7):
  7029. - Work around a bug in OpenSSL 1.1.1a, which prevented the TLS 1.3
  7030. key export function from handling long labels. When this bug is
  7031. detected, Tor will disable TLS 1.3. We recommend upgrading to a
  7032. version of OpenSSL without this bug when it becomes available.
  7033. Closes ticket 28973.
  7034. o Minor bugfixes (relay statistics, backport from 0.3.5.7):
  7035. - Update relay descriptor on bandwidth changes only when the uptime
  7036. is smaller than 24h, in order to reduce the efficiency of guard
  7037. discovery attacks. Fixes bug 24104; bugfix on 0.1.1.6-alpha.
  7038. o Minor bugfixes (C correctness, backport from 0.3.5.4-alpha):
  7039. - Avoid undefined behavior in an end-of-string check when parsing
  7040. the BEGIN line in a directory object. Fixes bug 28202; bugfix
  7041. on 0.2.0.3-alpha.
  7042. o Minor bugfixes (code safety, backport from 0.3.5.3-alpha):
  7043. - Rewrite our assertion macros so that they no longer suppress the
  7044. compiler's -Wparentheses warnings. Fixes bug 27709; bugfix
  7045. o Minor bugfixes (compilation, backport from 0.3.5.5-alpha):
  7046. - Initialize a variable unconditionally in aes_new_cipher(), since
  7047. some compilers cannot tell that we always initialize it before
  7048. use. Fixes bug 28413; bugfix on 0.2.9.3-alpha.
  7049. o Minor bugfixes (directory authority, backport from 0.3.5.4-alpha):
  7050. - Log additional info when we get a relay that shares an ed25519 ID
  7051. with a different relay, instead making a BUG() warning. Fixes bug
  7052. 27800; bugfix on 0.3.2.1-alpha.
  7053. o Minor bugfixes (directory permissions, backport form 0.3.5.3-alpha):
  7054. - When a user requests a group-readable DataDirectory, give it to
  7055. them. Previously, when the DataDirectory and the CacheDirectory
  7056. were the same, the default setting (0) for
  7057. CacheDirectoryGroupReadable would override the setting for
  7058. DataDirectoryGroupReadable. Fixes bug 26913; bugfix
  7059. on 0.3.3.1-alpha.
  7060. o Minor bugfixes (onion service v3, backport from 0.3.5.1-alpha):
  7061. - When the onion service directory can't be created or has the wrong
  7062. permissions, do not log a stack trace. Fixes bug 27335; bugfix
  7063. on 0.3.2.1-alpha.
  7064. o Minor bugfixes (onion service v3, backport from 0.3.5.2-alpha):
  7065. - Close all SOCKS request (for the same .onion) if the newly fetched
  7066. descriptor is unusable. Before that, we would close only the first
  7067. one leaving the other hanging and let to time out by themselves.
  7068. Fixes bug 27410; bugfix on 0.3.2.1-alpha.
  7069. o Minor bugfixes (onion service v3, backport from 0.3.5.3-alpha):
  7070. - Don't warn so loudly when Tor is unable to decode an onion
  7071. descriptor. This can now happen as a normal use case if a client
  7072. gets a descriptor with client authorization but the client is not
  7073. authorized. Fixes bug 27550; bugfix on 0.3.5.1-alpha.
  7074. o Minor bugfixes (onion service v3, backport from 0.3.5.6-rc):
  7075. - When deleting an ephemeral onion service (DEL_ONION), do not close
  7076. any rendezvous circuits in order to let the existing client
  7077. connections finish by themselves or closed by the application. The
  7078. HS v2 is doing that already so now we have the same behavior for
  7079. all versions. Fixes bug 28619; bugfix on 0.3.3.1-alpha.
  7080. o Minor bugfixes (HTTP tunnel):
  7081. - Fix a bug warning when closing an HTTP tunnel connection due to
  7082. an HTTP request we couldn't handle. Fixes bug 26470; bugfix on
  7083. 0.3.2.1-alpha.
  7084. o Minor bugfixes (memory leaks, backport from 0.3.5.5-alpha):
  7085. - Fix a harmless memory leak in libtorrunner.a. Fixes bug 28419;
  7086. bugfix on 0.3.3.1-alpha. Patch from Martin Kepplinger.
  7087. o Minor bugfixes (netflow padding, backport from 0.3.5.1-alpha):
  7088. - Ensure circuitmux queues are empty before scheduling or sending
  7089. padding. Fixes bug 25505; bugfix on 0.3.1.1-alpha.
  7090. o Minor bugfixes (protover, backport from 0.3.5.3-alpha):
  7091. - Reject protocol names containing bytes other than alphanumeric
  7092. characters and hyphens ([A-Za-z0-9-]). Fixes bug 27316; bugfix
  7093. on 0.2.9.4-alpha.
  7094. o Minor bugfixes (rust, backport from 0.3.5.1-alpha):
  7095. - Compute protover votes correctly in the rust version of the
  7096. protover code. Previously, the protover rewrite in 24031 allowed
  7097. repeated votes from the same voter for the same protocol version
  7098. to be counted multiple times in protover_compute_vote(). Fixes bug
  7099. 27649; bugfix on 0.3.3.5-rc.
  7100. - Reject protover names that contain invalid characters. Fixes bug
  7101. 27687; bugfix on 0.3.3.1-alpha.
  7102. o Minor bugfixes (rust, backport from 0.3.5.2-alpha):
  7103. - protover_all_supported() would attempt to allocate up to 16GB on
  7104. some inputs, leading to a potential memory DoS. Fixes bug 27206;
  7105. bugfix on 0.3.3.5-rc.
  7106. o Minor bugfixes (rust, backport from 0.3.5.4-alpha):
  7107. - Fix a potential null dereference in protover_all_supported(). Add
  7108. a test for it. Fixes bug 27804; bugfix on 0.3.3.1-alpha.
  7109. - Return a string that can be safely freed by C code, not one
  7110. created by the rust allocator, in protover_all_supported(). Fixes
  7111. bug 27740; bugfix on 0.3.3.1-alpha.
  7112. - Fix an API mismatch in the rust implementation of
  7113. protover_compute_vote(). This bug could have caused crashes on any
  7114. directory authorities running Tor with Rust (which we do not yet
  7115. recommend). Fixes bug 27741; bugfix on 0.3.3.6.
  7116. o Minor bugfixes (testing, backport from 0.3.5.1-alpha):
  7117. - If a unit test running in a subprocess exits abnormally or with a
  7118. nonzero status code, treat the test as having failed, even if the
  7119. test reported success. Without this fix, memory leaks don't cause
  7120. the tests to fail, even with LeakSanitizer. Fixes bug 27658;
  7121. bugfix on 0.2.2.4-alpha.
  7122. o Minor bugfixes (testing, backport from 0.3.5.4-alpha):
  7123. - Treat backtrace test failures as expected on BSD-derived systems
  7124. (NetBSD, OpenBSD, and macOS/Darwin) until we solve bug 17808.
  7125. (FreeBSD failures have been treated as expected since 18204 in
  7126. 0.2.8.) Fixes bug 27948; bugfix on 0.2.5.2-alpha.
  7127. o Minor bugfixes (unit tests, guard selection, backport from 0.3.5.6-rc):
  7128. - Stop leaking memory in an entry guard unit test. Fixes bug 28554;
  7129. bugfix on 0.3.0.1-alpha.
  7130. Changes in version 0.3.4.10 - 2019-01-07
  7131. Tor 0.3.4.9 is the second stable release in its series; it backports
  7132. numerous fixes, including an important fix for relays, and for anyone
  7133. using OpenSSL 1.1.1. Anyone running an earlier version of Tor 0.3.4
  7134. should upgrade.
  7135. As a reminder, the Tor 0.3.4 series will be supported until 10 June
  7136. 2019. Some time between now and then, users should switch to the Tor
  7137. 0.3.5 series, which will receive long-term support until at least 1
  7138. Feb 2022.
  7139. o Major bugfixes (OpenSSL, portability, backport from 0.3.5.5-alpha):
  7140. - Fix our usage of named groups when running as a TLS 1.3 client in
  7141. OpenSSL 1.1.1. Previously, we only initialized EC groups when
  7142. running as a relay, which caused clients to fail to negotiate TLS
  7143. 1.3 with relays. Fixes bug 28245; bugfix on 0.2.9.15 (when TLS 1.3
  7144. support was added).
  7145. o Major bugfixes (relay, directory, backport from 0.3.5.7):
  7146. - Always reactivate linked connections in the main loop so long as
  7147. any linked connection has been active. Previously, connections
  7148. serving directory information wouldn't get reactivated after the
  7149. first chunk of data was sent (usually 32KB), which would prevent
  7150. clients from bootstrapping. Fixes bug 28912; bugfix on
  7151. 0.3.4.1-alpha. Patch by "cypherpunks3".
  7152. o Minor features (continuous integration, Windows, backport from 0.3.5.6-rc):
  7153. - Always show the configure and test logs, and upload them as build
  7154. artifacts, when building for Windows using Appveyor CI.
  7155. Implements 28459.
  7156. o Minor features (controller, backport from 0.3.5.1-alpha):
  7157. - For purposes of CIRC_BW-based dropped cell detection, track half-
  7158. closed stream ids, and allow their ENDs, SENDMEs, DATA and path
  7159. bias check cells to arrive without counting it as dropped until
  7160. either the END arrives, or the windows are empty. Closes
  7161. ticket 25573.
  7162. o Minor features (fallback directory list, backport from 0.3.5.6-rc):
  7163. - Replace the 150 fallbacks originally introduced in Tor
  7164. 0.3.3.1-alpha in January 2018 (of which ~115 were still
  7165. functional), with a list of 157 fallbacks (92 new, 65 existing, 85
  7166. removed) generated in December 2018. Closes ticket 24803.
  7167. o Minor features (geoip):
  7168. - Update geoip and geoip6 to the November 6 2018 Maxmind GeoLite2
  7169. Country database. Closes ticket 28395.
  7170. o Minor features (OpenSSL bug workaround, backport from 0.3.5.7):
  7171. - Work around a bug in OpenSSL 1.1.1a, which prevented the TLS 1.3
  7172. key export function from handling long labels. When this bug is
  7173. detected, Tor will disable TLS 1.3. We recommend upgrading to a
  7174. version of OpenSSL without this bug when it becomes available.
  7175. Closes ticket 28973.
  7176. o Minor bugfixes (compilation, backport from 0.3.5.5-alpha):
  7177. - Initialize a variable unconditionally in aes_new_cipher(), since
  7178. some compilers cannot tell that we always initialize it before
  7179. use. Fixes bug 28413; bugfix on 0.2.9.3-alpha.
  7180. o Minor bugfixes (connection, relay, backport from 0.3.5.5-alpha):
  7181. - Avoid a logging a BUG() stacktrace when closing connection held
  7182. open because the write side is rate limited but not the read side.
  7183. Now, the connection read side is simply shut down until Tor is
  7184. able to flush the connection and close it. Fixes bug 27750; bugfix
  7185. on 0.3.4.1-alpha.
  7186. o Minor bugfixes (continuous integration, Windows, backport from 0.3.5.5-alpha):
  7187. - Manually configure the zstd compiler options, when building using
  7188. mingw on Appveyor Windows CI. The MSYS2 mingw zstd package does
  7189. not come with a pkg-config file. Fixes bug 28454; bugfix
  7190. on 0.3.4.1-alpha.
  7191. - Stop using an external OpenSSL install, and stop installing MSYS2
  7192. packages, when building using mingw on Appveyor Windows CI. Fixes
  7193. bug 28399; bugfix on 0.3.4.1-alpha.
  7194. o Minor bugfixes (continuous integration, Windows, backport from 0.3.5.6-rc):
  7195. - Explicitly specify the path to the OpenSSL library and do not
  7196. download OpenSSL from Pacman, but instead use the library that is
  7197. already provided by AppVeyor. Fixes bug 28574; bugfix on master.
  7198. o Minor bugfixes (directory permissions, backport form 0.3.5.3-alpha):
  7199. - When a user requests a group-readable DataDirectory, give it to
  7200. them. Previously, when the DataDirectory and the CacheDirectory
  7201. were the same, the default setting (0) for
  7202. CacheDirectoryGroupReadable would override the setting for
  7203. DataDirectoryGroupReadable. Fixes bug 26913; bugfix
  7204. on 0.3.3.1-alpha.
  7205. o Minor bugfixes (memory leaks, backport from 0.3.5.5-alpha):
  7206. - Fix a harmless memory leak in libtorrunner.a. Fixes bug 28419;
  7207. bugfix on 0.3.3.1-alpha. Patch from Martin Kepplinger.
  7208. o Minor bugfixes (onion service v3, backport from 0.3.5.3-alpha):
  7209. - Don't warn so loudly when Tor is unable to decode an onion
  7210. descriptor. This can now happen as a normal use case if a client
  7211. gets a descriptor with client authorization but the client is not
  7212. authorized. Fixes bug 27550; bugfix on 0.3.5.1-alpha.
  7213. o Minor bugfixes (onion service v3, backport from 0.3.5.6-rc):
  7214. - When deleting an ephemeral onion service (DEL_ONION), do not close
  7215. any rendezvous circuits in order to let the existing client
  7216. connections finish by themselves or closed by the application. The
  7217. HS v2 is doing that already so now we have the same behavior for
  7218. all versions. Fixes bug 28619; bugfix on 0.3.3.1-alpha.
  7219. o Minor bugfixes (relay statistics, backport from 0.3.5.7):
  7220. - Update relay descriptor on bandwidth changes only when the uptime
  7221. is smaller than 24h, in order to reduce the efficiency of guard
  7222. discovery attacks. Fixes bug 24104; bugfix on 0.1.1.6-alpha.
  7223. o Minor bugfixes (unit tests, guard selection, backport from 0.3.5.6-rc):
  7224. - Stop leaking memory in an entry guard unit test. Fixes bug 28554;
  7225. bugfix on 0.3.0.1-alpha.
  7226. Changes in version 0.3.5.7 - 2019-01-07
  7227. Tor 0.3.5.7 is the first stable release in its series; it includes
  7228. compilation and portability fixes, and a fix for a severe problem
  7229. affecting directory caches.
  7230. The Tor 0.3.5 series includes several new features and performance
  7231. improvements, including client authorization for v3 onion services,
  7232. cleanups to bootstrap reporting, support for improved bandwidth-
  7233. measurement tools, experimental support for NSS in place of OpenSSL,
  7234. and much more. It also begins a full reorganization of Tor's code
  7235. layout, for improved modularity and maintainability in the future.
  7236. Finally, there is the usual set of performance improvements and
  7237. bugfixes that we try to do in every release series.
  7238. There are a couple of changes in the 0.3.5 that may affect
  7239. compatibility. First, the default version for newly created onion
  7240. services is now v3. Use the HiddenServiceVersion option if you want to
  7241. override this. Second, some log messages related to bootstrapping have
  7242. changed; if you use stem, you may need to update to the latest version
  7243. so it will recognize them.
  7244. We have designated 0.3.5 as a "long-term support" (LTS) series: we
  7245. will continue to patch major bugs in typical configurations of 0.3.5
  7246. until at least 1 Feb 2022. (We do not plan to provide long-term
  7247. support for embedding, Rust support, NSS support, running a directory
  7248. authority, or unsupported platforms. For these, you will need to stick
  7249. with the latest stable release.)
  7250. Below are the changes since 0.3.4.9. For a complete list of changes
  7251. since 0.3.5.6-rc, see the ChangeLog file.
  7252. o Major features (bootstrap):
  7253. - Don't report directory progress until after a connection to a
  7254. relay or bridge has succeeded. Previously, we'd report 80%
  7255. progress based on cached directory information when we couldn't
  7256. even connect to the network. Closes ticket 27169.
  7257. o Major features (new code layout):
  7258. - Nearly all of Tor's source code has been moved around into more
  7259. logical places. The "common" directory is now divided into a set
  7260. of libraries in "lib", and files in the "or" directory have been
  7261. split into "core" (logic absolutely needed for onion routing),
  7262. "feature" (independent modules in Tor), and "app" (to configure
  7263. and invoke the rest of Tor). See doc/HACKING/CodeStructure.md for
  7264. more information. Closes ticket 26481.
  7265. This refactoring is not complete: although the libraries have been
  7266. refactored to be acyclic, the main body of Tor is still too
  7267. interconnected. We will attempt to improve this in the future.
  7268. o Major features (onion services v3):
  7269. - Implement onion service client authorization at the descriptor
  7270. level: only authorized clients can decrypt a service's descriptor
  7271. to find out how to contact it. A new torrc option was added to
  7272. control this client side: ClientOnionAuthDir <path>. On the
  7273. service side, if the "authorized_clients/" directory exists in the
  7274. onion service directory path, client configurations are read from
  7275. the files within. See the manpage for more details. Closes ticket
  7276. 27547. Patch done by Suphanat Chunhapanya (haxxpop).
  7277. - Improve revision counter generation in next-gen onion services.
  7278. Onion services can now scale by hosting multiple instances on
  7279. different hosts without synchronization between them, which was
  7280. previously impossible because descriptors would get rejected by
  7281. HSDirs. Addresses ticket 25552.
  7282. - Version 3 onion services can now use the per-service
  7283. HiddenServiceExportCircuitID option to differentiate client
  7284. circuits. It communicates with the service by using the HAProxy
  7285. protocol to assign virtual IP addresses to inbound client
  7286. circuits. Closes ticket 4700. Patch by Mahrud Sayrafi.
  7287. o Major features (onion services, UI change):
  7288. - For a newly created onion service, the default version is now 3.
  7289. Tor still supports existing version 2 services, but the operator
  7290. now needs to set "HiddenServiceVersion 2" in order to create a new
  7291. version 2 service. For existing services, Tor now learns the
  7292. version by reading the key file. Closes ticket 27215.
  7293. o Major features (portability, cryptography, experimental, TLS):
  7294. - Tor now has the option to compile with the NSS library instead of
  7295. OpenSSL. This feature is experimental, and we expect that bugs may
  7296. remain. It is mainly intended for environments where Tor's
  7297. performance is not CPU-bound, and where NSS is already known to be
  7298. installed. To try it out, configure Tor with the --enable-nss
  7299. flag. Closes tickets 26631, 26815, and 26816.
  7300. If you are experimenting with this option and using an old cached
  7301. consensus, Tor may fail to start. To solve this, delete your
  7302. "cached-consensus" and "cached-microdesc-consensus" files,
  7303. (if present), and restart Tor.
  7304. o Major features (relay, UI change):
  7305. - Relays no longer run as exits by default. If the "ExitRelay"
  7306. option is auto (or unset), and no exit policy is specified with
  7307. ExitPolicy or ReducedExitPolicy, we now treat ExitRelay as 0.
  7308. Previously in this case, we allowed exit traffic and logged a
  7309. warning message. Closes ticket 21530. Patch by Neel Chauhan.
  7310. - Tor now validates that the ContactInfo config option is valid UTF-
  7311. 8 when parsing torrc. Closes ticket 27428.
  7312. o Major bugfixes (compilation):
  7313. - Fix compilation on ARM (and other less-used CPUs) when compiling
  7314. with OpenSSL before 1.1. Fixes bug 27781; bugfix on 0.3.4.1-alpha.
  7315. o Major bugfixes (compilation, rust):
  7316. - Rust tests can now build and run successfully with the
  7317. --enable-fragile-hardening option enabled. Doing this currently
  7318. requires the rust beta channel; it will be possible with stable
  7319. rust once Rust version 1.31 is released. Patch from Alex Crichton.
  7320. Fixes bugs 27272, 27273, and 27274. Bugfix on 0.3.1.1-alpha.
  7321. o Major bugfixes (directory authority):
  7322. - Actually check that the address we get from DirAuthority
  7323. configuration line is valid IPv4. Explicitly disallow DirAuthority
  7324. address to be a DNS hostname. Fixes bug 26488; bugfix
  7325. on 0.1.2.10-rc.
  7326. o Major bugfixes (embedding, main loop):
  7327. - When DisableNetwork becomes set, actually disable periodic events
  7328. that are already enabled. (Previously, we would refrain from
  7329. enabling new ones, but we would leave the old ones turned on.)
  7330. Fixes bug 28348; bugfix on 0.3.4.1-alpha.
  7331. o Major bugfixes (main loop, bootstrap):
  7332. - Make sure Tor bootstraps and works properly if only the
  7333. ControlPort is set. Prior to this fix, Tor would only bootstrap
  7334. when a client port was set (Socks, Trans, NATD, DNS or HTTPTunnel
  7335. port). Fixes bug 27849; bugfix on 0.3.4.1-alpha.
  7336. o Major bugfixes (onion service v3):
  7337. - On an intro point for a version 3 onion service, stop closing
  7338. introduction circuits on a NACK. This lets the client decide
  7339. whether to reuse the circuit or discard it. Previously, we closed
  7340. intro circuits when sending NACKs. Fixes bug 27841; bugfix on
  7341. 0.3.2.1-alpha. Patch by Neel Chaunan.
  7342. o Major bugfixes (OpenSSL, portability):
  7343. - Fix our usage of named groups when running as a TLS 1.3 client in
  7344. OpenSSL 1.1.1. Previously, we only initialized EC groups when
  7345. running as a relay, which caused clients to fail to negotiate TLS
  7346. 1.3 with relays. Fixes bug 28245; bugfix on 0.2.9.15 (when TLS 1.3
  7347. support was added).
  7348. o Major bugfixes (relay bandwidth statistics):
  7349. - When we close relayed circuits, report the data in the circuit
  7350. queues as being written in our relay bandwidth stats. This
  7351. mitigates guard discovery and other attacks that close circuits
  7352. for the explicit purpose of noticing this discrepancy in
  7353. statistics. Fixes bug 23512; bugfix on 0.0.8pre3.
  7354. o Major bugfixes (relay):
  7355. - When our write bandwidth limit is exhausted, stop writing on the
  7356. connection. Previously, we had a typo in the code that would make
  7357. us stop reading instead, leading to relay connections being stuck
  7358. indefinitely and consuming kernel RAM. Fixes bug 28089; bugfix
  7359. on 0.3.4.1-alpha.
  7360. - Always reactivate linked connections in the main loop so long as
  7361. any linked connection has been active. Previously, connections
  7362. serving directory information wouldn't get reactivated after the
  7363. first chunk of data was sent (usually 32KB), which would prevent
  7364. clients from bootstrapping. Fixes bug 28912; bugfix on
  7365. 0.3.4.1-alpha. Patch by "cypherpunks3".
  7366. o Major bugfixes (restart-in-process):
  7367. - Fix a use-after-free error that could be caused by passing Tor an
  7368. impossible set of options that would fail during options_act().
  7369. Fixes bug 27708; bugfix on 0.3.3.1-alpha.
  7370. o Minor features (admin tools):
  7371. - Add a new --key-expiration option to print the expiration date of
  7372. the signing cert in an ed25519_signing_cert file. Resolves
  7373. issue 19506.
  7374. o Minor features (build):
  7375. - If you pass the "--enable-pic" option to configure, Tor will try
  7376. to tell the compiler to build position-independent code suitable
  7377. to link into a dynamic library. (The default remains -fPIE, for
  7378. code suitable for a relocatable executable.) Closes ticket 23846.
  7379. o Minor features (code correctness, testing):
  7380. - Tor's build process now includes a "check-includes" make target to
  7381. verify that no module of Tor relies on any headers from a higher-
  7382. level module. We hope to use this feature over time to help
  7383. refactor our codebase. Closes ticket 26447.
  7384. o Minor features (code layout):
  7385. - We have a new "lowest-level" error-handling API for use by code
  7386. invoked from within the logging module. With this interface, the
  7387. logging code is no longer at risk of calling into itself if a
  7388. failure occurs while it is trying to log something. Closes
  7389. ticket 26427.
  7390. o Minor features (compilation):
  7391. - When possible, place our warning flags in a separate file, to
  7392. avoid flooding verbose build logs. Closes ticket 28924.
  7393. - Tor's configure script now supports a --with-malloc= option to
  7394. select your malloc implementation. Supported options are
  7395. "tcmalloc", "jemalloc", "openbsd" (deprecated), and "system" (the
  7396. default). Addresses part of ticket 20424. Based on a patch from
  7397. Alex Xu.
  7398. o Minor features (config):
  7399. - The "auto" keyword in torrc is now case-insensitive. Closes
  7400. ticket 26663.
  7401. o Minor features (continuous integration):
  7402. - Add a Travis CI build for --enable-nss on Linux gcc. Closes
  7403. ticket 27751.
  7404. - Add new CI job to Travis configuration to run stem-based
  7405. integration tests. Closes ticket 27913.
  7406. - Use the Travis Homebrew addon to install packages on macOS during
  7407. Travis CI. The package list is the same, but the Homebrew addon
  7408. does not do a `brew update` by default. Implements ticket 27738.
  7409. - Report what program produced the mysterious core file that we
  7410. occasionally see on Travis CI during make distcheck. Closes
  7411. ticket 28024.
  7412. - Don't do a distcheck with --disable-module-dirauth in Travis.
  7413. Implements ticket 27252.
  7414. - Install libcap-dev and libseccomp2-dev so these optional
  7415. dependencies get tested on Travis CI. Closes ticket 26560.
  7416. - Only run one online rust build in Travis, to reduce network
  7417. errors. Skip offline rust builds on Travis for Linux gcc, because
  7418. they're redundant. Implements ticket 27252.
  7419. - Skip gcc on OSX in Travis CI, because it's rarely used. Skip a
  7420. duplicate hardening-off build in Travis on Tor 0.2.9. Skip gcc on
  7421. Linux with default settings, because all the non-default builds
  7422. use gcc on Linux. Implements ticket 27252.
  7423. o Minor features (continuous integration, Windows):
  7424. - Always show the configure and test logs, and upload them as build
  7425. artifacts, when building for Windows using Appveyor CI.
  7426. Implements 28459.
  7427. - Build tor on Windows Server 2012 R2 and Windows Server 2016 using
  7428. Appveyor's CI. Closes ticket 28318.
  7429. o Minor features (controller):
  7430. - Emit CIRC_BW events as soon as we detect that we processed an
  7431. invalid or otherwise dropped cell on a circuit. This allows
  7432. vanguards and other controllers to react more quickly to dropped
  7433. cells. Closes ticket 27678.
  7434. - For purposes of CIRC_BW-based dropped cell detection, track half-
  7435. closed stream ids, and allow their ENDs, SENDMEs, DATA and path
  7436. bias check cells to arrive without counting it as dropped until
  7437. either the END arrives, or the windows are empty. Closes
  7438. ticket 25573.
  7439. - Implement a 'GETINFO md/all' controller command to enable getting
  7440. all known microdescriptors. Closes ticket 8323.
  7441. - The GETINFO command now support an "uptime" argument, to return
  7442. Tor's uptime in seconds. Closes ticket 25132.
  7443. o Minor features (denial-of-service avoidance):
  7444. - Make our OOM handler aware of the DNS cache so that it doesn't
  7445. fill up the memory. This check is important for our DoS mitigation
  7446. subsystem. Closes ticket 18642. Patch by Neel Chauhan.
  7447. o Minor features (development):
  7448. - Tor's makefile now supports running the "clippy" Rust style tool
  7449. on our Rust code. Closes ticket 22156.
  7450. o Minor features (directory authority):
  7451. - There is no longer an artificial upper limit on the length of
  7452. bandwidth lines. Closes ticket 26223.
  7453. - When a bandwidth file is used to obtain the bandwidth measurements,
  7454. include this bandwidth file headers in the votes. Closes
  7455. ticket 3723.
  7456. - Improved support for networks with only a single authority or a
  7457. single fallback directory. Patch from Gabriel Somlo. Closes
  7458. ticket 25928.
  7459. o Minor features (embedding API):
  7460. - The Tor controller API now supports a function to launch Tor with
  7461. a preconstructed owning controller FD, so that embedding
  7462. applications don't need to manage controller ports and
  7463. authentication. Closes ticket 24204.
  7464. - The Tor controller API now has a function that returns the name
  7465. and version of the backend implementing the API. Closes
  7466. ticket 26947.
  7467. o Minor features (fallback directory list):
  7468. - Replace the 150 fallbacks originally introduced in Tor
  7469. 0.3.3.1-alpha in January 2018 (of which ~115 were still
  7470. functional), with a list of 157 fallbacks (92 new, 65 existing, 85
  7471. removed) generated in December 2018. Closes ticket 24803.
  7472. o Minor features (geoip):
  7473. - Update geoip and geoip6 to the January 3 2019 Maxmind GeoLite2
  7474. Country database. Closes ticket 29012.
  7475. o Minor features (memory management):
  7476. - Get Libevent to use the same memory allocator as Tor, by calling
  7477. event_set_mem_functions() during initialization. Resolves
  7478. ticket 8415.
  7479. o Minor features (memory usage):
  7480. - When not using them, store legacy TAP public onion keys in DER-
  7481. encoded format, rather than as expanded public keys. This should
  7482. save several megabytes on typical clients. Closes ticket 27246.
  7483. o Minor features (OpenSSL bug workaround):
  7484. - Work around a bug in OpenSSL 1.1.1a, which prevented the TLS 1.3
  7485. key export function from handling long labels. When this bug is
  7486. detected, Tor will disable TLS 1.3. We recommend upgrading to a
  7487. version of OpenSSL without this bug when it becomes available.
  7488. Closes ticket 28973.
  7489. o Minor features (OpenSSL):
  7490. - When possible, use RFC5869 HKDF implementation from OpenSSL rather
  7491. than our own. Resolves ticket 19979.
  7492. o Minor features (performance):
  7493. - Remove about 96% of the work from the function that we run at
  7494. startup to test our curve25519_basepoint implementation. Since
  7495. this function has yet to find an actual failure, we now only run
  7496. it for 8 iterations instead of 200. Based on our profile
  7497. information, this change should save around 8% of our startup time
  7498. on typical desktops, and may have a similar effect on other
  7499. platforms. Closes ticket 28838.
  7500. - Stop re-validating our hardcoded Diffie-Hellman parameters on
  7501. every startup. Doing this wasted time and cycles, especially on
  7502. low-powered devices. Closes ticket 28851.
  7503. o Minor features (Rust, code quality):
  7504. - Improve rust code quality in the rust protover implementation by
  7505. making it more idiomatic. Includes changing an internal API to
  7506. take &str instead of &String. Closes ticket 26492.
  7507. o Minor features (testing):
  7508. - Add scripts/test/chutney-git-bisect.sh, for bisecting using
  7509. chutney. Implements ticket 27211.
  7510. o Minor features (tor-resolve):
  7511. - The tor-resolve utility can now be used with IPv6 SOCKS proxies.
  7512. Side-effect of the refactoring for ticket 26526.
  7513. o Minor features (UI):
  7514. - Log each included configuration file or directory as we read it,
  7515. to provide more visibility about where Tor is reading from. Patch
  7516. from Unto Sten; closes ticket 27186.
  7517. - Lower log level of "Scheduler type KIST has been enabled" to INFO.
  7518. Closes ticket 26703.
  7519. o Minor bugfixes (32-bit OSX and iOS, timing):
  7520. - Fix an integer overflow bug in our optimized 32-bit millisecond-
  7521. difference algorithm for 32-bit Apple platforms. Previously, it
  7522. would overflow when calculating the difference between two times
  7523. more than 47 days apart. Fixes part of bug 27139; bugfix
  7524. on 0.3.4.1-alpha.
  7525. - Improve the precision of our 32-bit millisecond difference
  7526. algorithm for 32-bit Apple platforms. Fixes part of bug 27139;
  7527. bugfix on 0.3.4.1-alpha.
  7528. - Relax the tolerance on the mainloop/update_time_jumps test when
  7529. running on 32-bit Apple platforms. Fixes part of bug 27139; bugfix
  7530. on 0.3.4.1-alpha.
  7531. o Minor bugfixes (bootstrap):
  7532. - Try harder to get descriptors in non-exit test networks, by using
  7533. the mid weight for the third hop when there are no exits. Fixes
  7534. bug 27237; bugfix on 0.2.6.2-alpha.
  7535. o Minor bugfixes (C correctness):
  7536. - Avoid casting smartlist index to int implicitly, as it may trigger
  7537. a warning (-Wshorten-64-to-32). Fixes bug 26282; bugfix on
  7538. 0.2.3.13-alpha, 0.2.7.1-alpha and 0.2.1.1-alpha.
  7539. - Use time_t for all values in
  7540. predicted_ports_prediction_time_remaining(). Rework the code that
  7541. computes difference between durations/timestamps. Fixes bug 27165;
  7542. bugfix on 0.3.1.1-alpha.
  7543. o Minor bugfixes (client, memory usage):
  7544. - When not running as a directory cache, there is no need to store
  7545. the text of the current consensus networkstatus in RAM.
  7546. Previously, however, clients would store it anyway, at a cost of
  7547. over 5 MB. Now, they do not. Fixes bug 27247; bugfix
  7548. on 0.3.0.1-alpha.
  7549. o Minor bugfixes (client, ReachableAddresses):
  7550. - Instead of adding a "reject *:*" line to ReachableAddresses when
  7551. loading the configuration, add one to the policy after parsing it
  7552. in parse_reachable_addresses(). This prevents extra "reject *.*"
  7553. lines from accumulating on reloads. Fixes bug 20874; bugfix on
  7554. 0.1.1.5-alpha. Patch by Neel Chauhan.
  7555. o Minor bugfixes (code quality):
  7556. - Rename sandbox_getaddrinfo() and other functions to no longer
  7557. misleadingly suggest that they are sandbox-only. Fixes bug 26525;
  7558. bugfix on 0.2.7.1-alpha.
  7559. o Minor bugfixes (code safety):
  7560. - Rewrite our assertion macros so that they no longer suppress the
  7561. compiler's -Wparentheses warnings. Fixes bug 27709; bugfix
  7562. on 0.0.6.
  7563. o Minor bugfixes (compilation):
  7564. - Initialize a variable unconditionally in aes_new_cipher(), since
  7565. some compilers cannot tell that we always initialize it before
  7566. use. Fixes bug 28413; bugfix on 0.2.9.3-alpha.
  7567. o Minor bugfixes (configuration):
  7568. - Refuse to start with relative file paths and RunAsDaemon set
  7569. (regression from the fix for bug 22731). Fixes bug 28298; bugfix
  7570. on 0.3.3.1-alpha.
  7571. o Minor bugfixes (configuration, Onion Services):
  7572. - In rend_service_parse_port_config(), disallow any input to remain
  7573. after address-port pair was parsed. This will catch address and
  7574. port being whitespace-separated by mistake of the user. Fixes bug
  7575. 27044; bugfix on 0.2.9.10.
  7576. o Minor bugfixes (connection, relay):
  7577. - Avoid a logging a BUG() stacktrace when closing connection held
  7578. open because the write side is rate limited but not the read side.
  7579. Now, the connection read side is simply shut down until Tor is
  7580. able to flush the connection and close it. Fixes bug 27750; bugfix
  7581. on 0.3.4.1-alpha.
  7582. o Minor bugfixes (continuous integration, Windows):
  7583. - Stop reinstalling identical packages in our Windows CI. Fixes bug
  7584. 27464; bugfix on 0.3.4.1-alpha.
  7585. - Install only the necessary mingw packages during our appveyor
  7586. builds. This change makes the build a little faster, and prevents
  7587. a conflict with a preinstalled mingw openssl that appveyor now
  7588. ships. Fixes bugs 27765 and 27943; bugfix on 0.3.4.2-alpha.
  7589. - Explicitly specify the path to the OpenSSL library and do not
  7590. download OpenSSL from Pacman, but instead use the library that is
  7591. already provided by AppVeyor. Fixes bug 28574; bugfix on master.
  7592. - Manually configure the zstd compiler options, when building using
  7593. mingw on Appveyor Windows CI. The MSYS2 mingw zstd package does
  7594. not come with a pkg-config file. Fixes bug 28454; bugfix
  7595. on 0.3.4.1-alpha.
  7596. - Stop using an external OpenSSL install, and stop installing MSYS2
  7597. packages, when building using mingw on Appveyor Windows CI. Fixes
  7598. bug 28399; bugfix on 0.3.4.1-alpha.
  7599. o Minor bugfixes (controller):
  7600. - Consider all routerinfo errors other than "not a server" to be
  7601. transient for the purpose of "GETINFO exit-policy/*" controller
  7602. request. Print stacktrace in the unlikely case of failing to
  7603. recompute routerinfo digest. Fixes bug 27034; bugfix
  7604. on 0.3.4.1-alpha.
  7605. o Minor bugfixes (correctness):
  7606. - Fix an unreached code path where we checked the value of
  7607. "hostname" inside send_resolved_hostname_cell(). Previously, we
  7608. used it before checking it; now we check it first. Fixes bug
  7609. 28879; bugfix on 0.1.2.7-alpha.
  7610. o Minor bugfixes (directory connection shutdown):
  7611. - Avoid a double-close when shutting down a stalled directory
  7612. connection. Fixes bug 26896; bugfix on 0.3.4.1-alpha.
  7613. o Minor bugfixes (directory permissions):
  7614. - When a user requests a group-readable DataDirectory, give it to
  7615. them. Previously, when the DataDirectory and the CacheDirectory
  7616. were the same, the default setting (0) for
  7617. CacheDirectoryGroupReadable would override the setting for
  7618. DataDirectoryGroupReadable. Fixes bug 26913; bugfix
  7619. on 0.3.3.1-alpha.
  7620. o Minor bugfixes (HTTP tunnel):
  7621. - Fix a bug warning when closing an HTTP tunnel connection due to an
  7622. HTTP request we couldn't handle. Fixes bug 26470; bugfix
  7623. on 0.3.2.1-alpha.
  7624. o Minor bugfixes (ipv6):
  7625. - In addrs_in_same_network_family(), we choose the subnet size based
  7626. on the IP version (IPv4 or IPv6). Previously, we chose a fixed
  7627. subnet size of /16 for both IPv4 and IPv6 addresses. Fixes bug
  7628. 15518; bugfix on 0.2.3.1-alpha. Patch by Neel Chauhan.
  7629. o Minor bugfixes (Linux seccomp2 sandbox):
  7630. - Permit the "shutdown()" system call, which is apparently used by
  7631. OpenSSL under some circumstances. Fixes bug 28183; bugfix
  7632. on 0.2.5.1-alpha.
  7633. o Minor bugfixes (logging):
  7634. - Stop talking about the Named flag in log messages. Clients have
  7635. ignored the Named flag since 0.3.2. Fixes bug 28441; bugfix
  7636. on 0.3.2.1-alpha.
  7637. - As a precaution, do an early return from log_addr_has_changed() if
  7638. Tor is running as client. Also, log a stack trace for debugging as
  7639. this function should only be called when Tor runs as server. Fixes
  7640. bug 26892; bugfix on 0.1.1.9-alpha.
  7641. - Refrain from mentioning bug 21018 in the logs, as it is already
  7642. fixed. Fixes bug 25477; bugfix on 0.2.9.8.
  7643. o Minor bugfixes (logging, documentation):
  7644. - When SafeLogging is enabled, scrub IP address in
  7645. channel_tls_process_netinfo_cell(). Also, add a note to manpage
  7646. that scrubbing is not guaranteed on loglevels below Notice. Fixes
  7647. bug 26882; bugfix on 0.2.4.10-alpha.
  7648. o Minor bugfixes (memory leaks):
  7649. - Fix a harmless memory leak in libtorrunner.a. Fixes bug 28419;
  7650. bugfix on 0.3.3.1-alpha. Patch from Martin Kepplinger.
  7651. - Fix a small memory leak when calling Tor with --dump-config. Fixes
  7652. bug 27893; bugfix on 0.3.2.1-alpha.
  7653. o Minor bugfixes (netflow padding):
  7654. - Ensure circuitmux queues are empty before scheduling or sending
  7655. padding. Fixes bug 25505; bugfix on 0.3.1.1-alpha.
  7656. o Minor bugfixes (onion service v2):
  7657. - Log at level "info", not "warning", in the case that we do not
  7658. have a consensus when a .onion request comes in. This can happen
  7659. normally while bootstrapping. Fixes bug 27040; bugfix
  7660. on 0.2.8.2-alpha.
  7661. o Minor bugfixes (onion service v3):
  7662. - When deleting an ephemeral onion service (DEL_ONION), do not close
  7663. any rendezvous circuits in order to let the existing client
  7664. connections finish by themselves or closed by the application. The
  7665. HS v2 is doing that already so now we have the same behavior for
  7666. all versions. Fixes bug 28619; bugfix on 0.3.3.1-alpha.
  7667. - Build the service descriptor's signing key certificate before
  7668. uploading, so we always have a fresh one: leaving no chances for
  7669. it to expire service side. Fixes bug 27838; bugfix
  7670. on 0.3.2.1-alpha.
  7671. - Stop dumping a stack trace when trying to connect to an intro
  7672. point without having a descriptor for it. Fixes bug 27774; bugfix
  7673. on 0.3.2.1-alpha.
  7674. - When selecting a v3 rendezvous point, don't only look at the
  7675. protover, but also check whether the curve25519 onion key is
  7676. present. This way we avoid picking a relay that supports the v3
  7677. rendezvous but for which we don't have the microdescriptor. Fixes
  7678. bug 27797; bugfix on 0.3.2.1-alpha.
  7679. - Close all SOCKS request (for the same .onion) if the newly fetched
  7680. descriptor is unusable. Before that, we would close only the first
  7681. one leaving the other hanging and let to time out by themselves.
  7682. Fixes bug 27410; bugfix on 0.3.2.1-alpha.
  7683. - When the onion service directory can't be created or has the wrong
  7684. permissions, do not log a stack trace. Fixes bug 27335; bugfix
  7685. on 0.3.2.1-alpha.
  7686. - When replacing a descriptor in the client cache, make sure to
  7687. close all client introduction circuits for the old descriptor, so
  7688. we don't end up with unusable leftover circuits. Fixes bug 27471;
  7689. bugfix on 0.3.2.1-alpha.
  7690. o Minor bugfixes (OS compatibility):
  7691. - Properly handle configuration changes that move a listener to/from
  7692. wildcard IP address. If the first attempt to bind a socket fails,
  7693. close the old listener and try binding the socket again. Fixes bug
  7694. 17873; bugfix on 0.0.8pre-1.
  7695. o Minor bugfixes (performance)::
  7696. - Rework node_is_a_configured_bridge() to no longer call
  7697. node_get_all_orports(), which was performing too many memory
  7698. allocations. Fixes bug 27224; bugfix on 0.2.3.9.
  7699. o Minor bugfixes (protover):
  7700. - Reject protocol names containing bytes other than alphanumeric
  7701. characters and hyphens ([A-Za-z0-9-]). Fixes bug 27316; bugfix
  7702. on 0.2.9.4-alpha.
  7703. o Minor bugfixes (protover, rust):
  7704. - Reject extra commas in version strings. Fixes bug 27197; bugfix
  7705. on 0.3.3.3-alpha.
  7706. - protover_all_supported() would attempt to allocate up to 16GB on
  7707. some inputs, leading to a potential memory DoS. Fixes bug 27206;
  7708. bugfix on 0.3.3.5-rc.
  7709. - Compute protover votes correctly in the rust version of the
  7710. protover code. Previously, the protover rewrite in 24031 allowed
  7711. repeated votes from the same voter for the same protocol version
  7712. to be counted multiple times in protover_compute_vote(). Fixes bug
  7713. 27649; bugfix on 0.3.3.5-rc.
  7714. - Reject protover names that contain invalid characters. Fixes bug
  7715. 27687; bugfix on 0.3.3.1-alpha.
  7716. o Minor bugfixes (relay shutdown, systemd):
  7717. - Notify systemd of ShutdownWaitLength so it can be set to longer
  7718. than systemd's TimeoutStopSec. In Tor's systemd service file, set
  7719. TimeoutSec to 60 seconds to allow Tor some time to shut down.
  7720. Fixes bug 28113; bugfix on 0.2.6.2-alpha.
  7721. o Minor bugfixes (relay statistics):
  7722. - Update relay descriptor on bandwidth changes only when the uptime
  7723. is smaller than 24h, in order to reduce the efficiency of guard
  7724. discovery attacks. Fixes bug 24104; bugfix on 0.1.1.6-alpha.
  7725. o Minor bugfixes (relay):
  7726. - Consider the fact that we'll be making direct connections to our
  7727. entry and guard nodes when computing the fraction of nodes that
  7728. have their descriptors. Also, if we are using bridges and there is
  7729. at least one bridge with a full descriptor, treat the fraction of
  7730. guards available as 100%. Fixes bug 25886; bugfix on 0.2.4.10-alpha.
  7731. Patch by Neel Chauhan.
  7732. - Update the message logged on relays when DirCache is disabled.
  7733. Since 0.3.3.5-rc, authorities require DirCache (V2Dir) for the
  7734. Guard flag. Fixes bug 24312; bugfix on 0.3.3.5-rc.
  7735. o Minor bugfixes (testing):
  7736. - Stop running stem's unit tests as part of "make test-stem", but
  7737. continue to run stem's unit and online tests during "make test-
  7738. stem-full". Fixes bug 28568; bugfix on 0.2.6.3-alpha.
  7739. - Stop leaking memory in an entry guard unit test. Fixes bug 28554;
  7740. bugfix on 0.3.0.1-alpha.
  7741. - Make the hs_service tests use the same time source when creating
  7742. the introduction point and when testing it. Now tests work better
  7743. on very slow systems like ARM or Travis. Fixes bug 27810; bugfix
  7744. on 0.3.2.1-alpha.
  7745. - Revise the "conditionvar_timeout" test so that it succeeds even on
  7746. heavily loaded systems where the test threads are not scheduled
  7747. within 200 msec. Fixes bug 27073; bugfix on 0.2.6.3-alpha.
  7748. - Fix two unit tests to work when HOME environment variable is not
  7749. set. Fixes bug 27096; bugfix on 0.2.8.1-alpha.
  7750. - If a unit test running in a subprocess exits abnormally or with a
  7751. nonzero status code, treat the test as having failed, even if the
  7752. test reported success. Without this fix, memory leaks don't cause
  7753. the tests to fail, even with LeakSanitizer. Fixes bug 27658;
  7754. bugfix on 0.2.2.4-alpha.
  7755. - When logging a version mismatch in our openssl_version tests,
  7756. report the actual offending version strings. Fixes bug 26152;
  7757. bugfix on 0.2.9.1-alpha.
  7758. - Fix forking tests on Windows when there is a space somewhere in
  7759. the path. Fixes bug 26437; bugfix on 0.2.2.4-alpha.
  7760. o Minor bugfixes (Windows):
  7761. - Correctly identify Windows 8.1, Windows 10, and Windows Server
  7762. 2008 and later from their NT versions. Fixes bug 28096; bugfix on
  7763. 0.2.2.34; reported by Keifer Bly.
  7764. - On recent Windows versions, the GetVersionEx() function may report
  7765. an earlier Windows version than the running OS. To avoid user
  7766. confusion, add "[or later]" to Tor's version string on affected
  7767. versions of Windows. Fixes bug 28096; bugfix on 0.2.2.34; reported
  7768. by Keifer Bly.
  7769. - Remove Windows versions that were never supported by the
  7770. GetVersionEx() function. Stop duplicating the latest Windows
  7771. version in get_uname(). Fixes bug 28096; bugfix on 0.2.2.34;
  7772. reported by Keifer Bly.
  7773. o Code simplification and refactoring:
  7774. - When parsing a port configuration, make it more obvious to static
  7775. analyzer tools that we always initialize the address. Closes
  7776. ticket 28881.
  7777. - Divide more large Tor source files -- especially ones that span
  7778. multiple areas of functionality -- into smaller parts, including
  7779. onion.c and main.c. Closes ticket 26747.
  7780. - Divide the "routerparse.c" module into separate modules for each
  7781. group of parsed objects. Closes ticket 27924.
  7782. - Move protover_rust.c to the same place protover.c was moved to.
  7783. Closes ticket 27814.
  7784. - Split directory.c into separate pieces for client, server, and
  7785. common functionality. Closes ticket 26744.
  7786. - Split the non-statistics-related parts from the rephist.c and
  7787. geoip.c modules. Closes ticket 27892.
  7788. - Split the router.c file into relay-only and shared components, to
  7789. help with future modularization. Closes ticket 27864.
  7790. - Divide the routerlist.c and dirserv.c modules into smaller parts.
  7791. Closes ticket 27799.
  7792. - 'updateFallbackDirs.py' now ignores the blacklist file, as it's not
  7793. longer needed. Closes ticket 26502.
  7794. - Include paths to header files within Tor are now qualified by
  7795. directory within the top-level src directory.
  7796. - Many structures have been removed from the centralized "or.h"
  7797. header, and moved into their own headers. This will allow us to
  7798. reduce the number of places in the code that rely on each
  7799. structure's contents and layout. Closes ticket 26383.
  7800. - Remove ATTR_NONNULL macro from codebase. Resolves ticket 26527.
  7801. - Remove GetAdaptersAddresses_fn_t. The code that used it was
  7802. removed as part of the 26481 refactor. Closes ticket 27467.
  7803. - Rework Tor SOCKS server code to use Trunnel and benefit from
  7804. autogenerated functions for parsing and generating SOCKS wire
  7805. format. New implementation is cleaner, more maintainable and
  7806. should be less prone to heartbleed-style vulnerabilities.
  7807. Implements a significant fraction of ticket 3569.
  7808. - Split sampled_guards_update_from_consensus() and
  7809. select_entry_guard_for_circuit() into subfunctions. In
  7810. entry_guards_update_primary() unite three smartlist enumerations
  7811. into one and move smartlist comparison code out of the function.
  7812. Closes ticket 21349.
  7813. - Tor now assumes that you have standards-conformant stdint.h and
  7814. inttypes.h headers when compiling. Closes ticket 26626.
  7815. - Unify our bloom filter logic. Previously we had two copies of this
  7816. code: one for routerlist filtering, and one for address set
  7817. calculations. Closes ticket 26510.
  7818. - Use the simpler strcmpstart() helper in
  7819. rend_parse_v2_service_descriptor instead of strncmp(). Closes
  7820. ticket 27630.
  7821. - Utility functions that can perform a DNS lookup are now wholly
  7822. separated from those that can't, in separate headers and C
  7823. modules. Closes ticket 26526.
  7824. o Documentation:
  7825. - In the tor-resolve(1) manpage, fix the reference to socks-
  7826. extensions.txt by adding a web URL. Resolves ticket 27853.
  7827. - Mention that we require Python to be 2.7 or newer for some
  7828. integration tests that we ship with Tor. Resolves ticket 27677.
  7829. - Copy paragraph and URL to Tor's code of conduct document from
  7830. CONTRIBUTING to new CODE_OF_CONDUCT file. Resolves ticket 26638.
  7831. - Remove old instructions from INSTALL document. Closes ticket 26588.
  7832. - Warn users that they should not include MyFamily line(s) in their
  7833. torrc when running Tor bridge. Closes ticket 26908.
  7834. o Removed features:
  7835. - Tor no longer supports building with the dmalloc library. For
  7836. debugging memory issues, we suggest using gperftools or msan
  7837. instead. Closes ticket 26426.
  7838. - Tor no longer attempts to run on Windows environments without the
  7839. GetAdaptersAddresses() function. This function has existed since
  7840. Windows XP, which is itself already older than we support.
  7841. - Remove Tor2web functionality for version 2 onion services. The
  7842. Tor2webMode and Tor2webRendezvousPoints options are now obsolete.
  7843. (This feature was never shipped in vanilla Tor and it was only
  7844. possible to use this feature by building the support at compile
  7845. time. Tor2webMode is not implemented for version 3 onion services.)
  7846. Closes ticket 26367.
  7847. o Testing:
  7848. - Increase logging and tag all log entries with timestamps in
  7849. test_rebind.py. Provides diagnostics for issue 28229.
  7850. o Code simplification and refactoring (shared random, dirauth):
  7851. - Change many tor_assert() to use BUG() instead. The idea is to not
  7852. crash a dirauth but rather scream loudly with a stacktrace and let
  7853. it continue run. The shared random subsystem is very resilient and
  7854. if anything wrong happens with it, at worst a non coherent value
  7855. will be put in the vote and discarded by the other authorities.
  7856. Closes ticket 19566.
  7857. o Documentation (onion services):
  7858. - Improve HSv3 client authorization by making some options more
  7859. explicit and detailed. Closes ticket 28026. Patch by Mike Tigas.
  7860. - Document in the man page that changing ClientOnionAuthDir value or
  7861. adding a new file in the directory will not work at runtime upon
  7862. sending a HUP if Sandbox 1. Closes ticket 28128.
  7863. - Note in the man page that the only real way to fully revoke an
  7864. onion service v3 client authorization is by restarting the tor
  7865. process. Closes ticket 28275.
  7866. Changes in version 0.3.4.9 - 2018-11-02
  7867. Tor 0.3.4.9 is the second stable release in its series; it backports
  7868. numerous fixes, including a fix for a bandwidth management bug that
  7869. was causing memory exhaustion on relays. Anyone running an earlier
  7870. version of Tor 0.3.4.9 should upgrade.
  7871. o Major bugfixes (compilation, backport from 0.3.5.3-alpha):
  7872. - Fix compilation on ARM (and other less-used CPUs) when compiling
  7873. with OpenSSL before 1.1. Fixes bug 27781; bugfix on 0.3.4.1-alpha.
  7874. o Major bugfixes (mainloop, bootstrap, backport from 0.3.5.3-alpha):
  7875. - Make sure Tor bootstraps and works properly if only the
  7876. ControlPort is set. Prior to this fix, Tor would only bootstrap
  7877. when a client port was set (Socks, Trans, NATD, DNS or HTTPTunnel
  7878. port). Fixes bug 27849; bugfix on 0.3.4.1-alpha.
  7879. o Major bugfixes (relay, backport from 0.3.5.3-alpha):
  7880. - When our write bandwidth limit is exhausted, stop writing on the
  7881. connection. Previously, we had a typo in the code that would make
  7882. us stop reading instead, leading to relay connections being stuck
  7883. indefinitely and consuming kernel RAM. Fixes bug 28089; bugfix
  7884. on 0.3.4.1-alpha.
  7885. o Major bugfixes (restart-in-process, backport from 0.3.5.1-alpha):
  7886. - Fix a use-after-free error that could be caused by passing Tor an
  7887. impossible set of options that would fail during options_act().
  7888. Fixes bug 27708; bugfix on 0.3.3.1-alpha.
  7889. o Minor features (continuous integration, backport from 0.3.5.1-alpha):
  7890. - Don't do a distcheck with --disable-module-dirauth in Travis.
  7891. Implements ticket 27252.
  7892. - Only run one online rust build in Travis, to reduce network
  7893. errors. Skip offline rust builds on Travis for Linux gcc, because
  7894. they're redundant. Implements ticket 27252.
  7895. - Skip gcc on OSX in Travis CI, because it's rarely used. Skip a
  7896. duplicate hardening-off build in Travis on Tor 0.2.9. Skip gcc on
  7897. Linux with default settings, because all the non-default builds
  7898. use gcc on Linux. Implements ticket 27252.
  7899. o Minor features (continuous integration, backport from 0.3.5.3-alpha):
  7900. - Use the Travis Homebrew addon to install packages on macOS during
  7901. Travis CI. The package list is the same, but the Homebrew addon
  7902. does not do a `brew update` by default. Implements ticket 27738.
  7903. o Minor features (geoip):
  7904. - Update geoip and geoip6 to the October 9 2018 Maxmind GeoLite2
  7905. Country database. Closes ticket 27991.
  7906. o Minor bugfixes (32-bit OSX and iOS, timing, backport from 0.3.5.2-alpha):
  7907. - Fix an integer overflow bug in our optimized 32-bit millisecond-
  7908. difference algorithm for 32-bit Apple platforms. Previously, it
  7909. would overflow when calculating the difference between two times
  7910. more than 47 days apart. Fixes part of bug 27139; bugfix
  7911. on 0.3.4.1-alpha.
  7912. - Improve the precision of our 32-bit millisecond difference
  7913. algorithm for 32-bit Apple platforms. Fixes part of bug 27139;
  7914. bugfix on 0.3.4.1-alpha.
  7915. - Relax the tolerance on the mainloop/update_time_jumps test when
  7916. running on 32-bit Apple platforms. Fixes part of bug 27139; bugfix
  7917. on 0.3.4.1-alpha.
  7918. o Minor bugfixes (C correctness, to appear in 0.3.5.4-alpha):
  7919. - Avoid undefined behavior in an end-of-string check when parsing
  7920. the BEGIN line in a directory object. Fixes bug 28202; bugfix
  7921. on 0.2.0.3-alpha.
  7922. o Minor bugfixes (CI, appveyor, to appear in 0.3.5.4-alpha):
  7923. - Only install the necessary mingw packages during our appveyor
  7924. builds. This change makes the build a little faster, and prevents
  7925. a conflict with a preinstalled mingw openssl that appveyor now
  7926. ships. Fixes bugs 27943 and 27765; bugfix on 0.3.4.2-alpha.
  7927. o Minor bugfixes (code safety, backport from 0.3.5.3-alpha):
  7928. - Rewrite our assertion macros so that they no longer suppress the
  7929. compiler's -Wparentheses warnings. Fixes bug 27709; bugfix
  7930. o Minor bugfixes (continuous integration, backport from 0.3.5.1-alpha):
  7931. - Stop reinstalling identical packages in our Windows CI. Fixes bug
  7932. 27464; bugfix on 0.3.4.1-alpha.
  7933. o Minor bugfixes (directory authority, to appear in 0.3.5.4-alpha):
  7934. - Log additional info when we get a relay that shares an ed25519 ID
  7935. with a different relay, instead making a BUG() warning. Fixes bug
  7936. 27800; bugfix on 0.3.2.1-alpha.
  7937. o Minor bugfixes (directory connection shutdown, backport from 0.3.5.1-alpha):
  7938. - Avoid a double-close when shutting down a stalled directory
  7939. connection. Fixes bug 26896; bugfix on 0.3.4.1-alpha.
  7940. o Minor bugfixes (HTTP tunnel, backport from 0.3.5.1-alpha):
  7941. - Fix a bug warning when closing an HTTP tunnel connection due to an
  7942. HTTP request we couldn't handle. Fixes bug 26470; bugfix
  7943. on 0.3.2.1-alpha.
  7944. o Minor bugfixes (netflow padding, backport from 0.3.5.1-alpha):
  7945. - Ensure circuitmux queues are empty before scheduling or sending
  7946. padding. Fixes bug 25505; bugfix on 0.3.1.1-alpha.
  7947. o Minor bugfixes (onion service v3, backport from 0.3.5.1-alpha):
  7948. - When the onion service directory can't be created or has the wrong
  7949. permissions, do not log a stack trace. Fixes bug 27335; bugfix
  7950. on 0.3.2.1-alpha.
  7951. o Minor bugfixes (onion service v3, backport from 0.3.5.2-alpha):
  7952. - Close all SOCKS request (for the same .onion) if the newly fetched
  7953. descriptor is unusable. Before that, we would close only the first
  7954. one leaving the other hanging and let to time out by themselves.
  7955. Fixes bug 27410; bugfix on 0.3.2.1-alpha.
  7956. o Minor bugfixes (onion service v3, backport from 0.3.5.3-alpha):
  7957. - When selecting a v3 rendezvous point, don't only look at the
  7958. protover, but also check whether the curve25519 onion key is
  7959. present. This way we avoid picking a relay that supports the v3
  7960. rendezvous but for which we don't have the microdescriptor. Fixes
  7961. bug 27797; bugfix on 0.3.2.1-alpha.
  7962. o Minor bugfixes (protover, backport from 0.3.5.3-alpha):
  7963. - Reject protocol names containing bytes other than alphanumeric
  7964. characters and hyphens ([A-Za-z0-9-]). Fixes bug 27316; bugfix
  7965. on 0.2.9.4-alpha.
  7966. o Minor bugfixes (rust, backport from 0.3.5.1-alpha):
  7967. - Compute protover votes correctly in the rust version of the
  7968. protover code. Previously, the protover rewrite in 24031 allowed
  7969. repeated votes from the same voter for the same protocol version
  7970. to be counted multiple times in protover_compute_vote(). Fixes bug
  7971. 27649; bugfix on 0.3.3.5-rc.
  7972. - Reject protover names that contain invalid characters. Fixes bug
  7973. 27687; bugfix on 0.3.3.1-alpha.
  7974. o Minor bugfixes (rust, backport from 0.3.5.2-alpha):
  7975. - protover_all_supported() would attempt to allocate up to 16GB on
  7976. some inputs, leading to a potential memory DoS. Fixes bug 27206;
  7977. bugfix on 0.3.3.5-rc.
  7978. o Minor bugfixes (rust, directory authority, to appear in 0.3.5.4-alpha):
  7979. - Fix an API mismatch in the rust implementation of
  7980. protover_compute_vote(). This bug could have caused crashes on any
  7981. directory authorities running Tor with Rust (which we do not yet
  7982. recommend). Fixes bug 27741; bugfix on 0.3.3.6.
  7983. o Minor bugfixes (rust, to appear in 0.3.5.4-alpha):
  7984. - Fix a potential null dereference in protover_all_supported(). Add
  7985. a test for it. Fixes bug 27804; bugfix on 0.3.3.1-alpha.
  7986. - Return a string that can be safely freed by C code, not one
  7987. created by the rust allocator, in protover_all_supported(). Fixes
  7988. bug 27740; bugfix on 0.3.3.1-alpha.
  7989. o Minor bugfixes (testing, backport from 0.3.5.1-alpha):
  7990. - If a unit test running in a subprocess exits abnormally or with a
  7991. nonzero status code, treat the test as having failed, even if the
  7992. test reported success. Without this fix, memory leaks don't cause
  7993. the tests to fail, even with LeakSanitizer. Fixes bug 27658;
  7994. bugfix on 0.2.2.4-alpha.
  7995. o Minor bugfixes (testing, backport from 0.3.5.3-alpha):
  7996. - Make the hs_service tests use the same time source when creating
  7997. the introduction point and when testing it. Now tests work better
  7998. on very slow systems like ARM or Travis. Fixes bug 27810; bugfix
  7999. on 0.3.2.1-alpha.
  8000. o Minor bugfixes (testing, to appear in 0.3.5.4-alpha):
  8001. - Treat backtrace test failures as expected on BSD-derived systems
  8002. (NetBSD, OpenBSD, and macOS/Darwin) until we solve bug 17808.
  8003. (FreeBSD failures have been treated as expected since 18204 in
  8004. 0.2.8.) Fixes bug 27948; bugfix on 0.2.5.2-alpha.
  8005. Changes in version 0.2.9.17 - 2018-09-10
  8006. Tor 0.2.9.17 backports numerous bugfixes from later versions of Tor.
  8007. o Minor features (compatibility, backport from 0.3.4.8):
  8008. - Tell OpenSSL to maintain backward compatibility with previous
  8009. RSA1024/DH1024 users in Tor. With OpenSSL 1.1.1-pre6, these
  8010. ciphers are disabled by default. Closes ticket 27344.
  8011. o Minor features (continuous integration, backport from 0.3.4.7-rc):
  8012. - Enable macOS builds in our Travis CI configuration. Closes
  8013. ticket 24629.
  8014. - Install libcap-dev and libseccomp2-dev so these optional
  8015. dependencies get tested on Travis CI. Closes ticket 26560.
  8016. - Run asciidoc during Travis CI. Implements ticket 27087.
  8017. - Use ccache in our Travis CI configuration. Closes ticket 26952.
  8018. o Minor features (geoip):
  8019. - Update geoip and geoip6 to the August 7 2018 Maxmind GeoLite2
  8020. Country database. Closes ticket 27089.
  8021. o Minor bugfixes (compilation, backport from 0.3.4.6-rc):
  8022. - When compiling with --enable-openbsd-malloc or --enable-tcmalloc,
  8023. tell the compiler not to include the system malloc implementation.
  8024. Fixes bug 20424; bugfix on 0.2.0.20-rc.
  8025. o Minor bugfixes (compilation, backport from 0.3.4.7-rc):
  8026. - Silence a spurious compiler warning on the GetAdaptersAddresses
  8027. function pointer cast. This issue is already fixed by 26481 in
  8028. 0.3.5 and later, by removing the lookup and cast. Fixes bug 27465;
  8029. bugfix on 0.2.3.11-alpha.
  8030. - Stop calling SetProcessDEPPolicy() on 64-bit Windows. It is not
  8031. supported, and always fails. Some compilers warn about the
  8032. function pointer cast on 64-bit Windows. Fixes bug 27461; bugfix
  8033. on 0.2.2.23-alpha.
  8034. o Minor bugfixes (compilation, windows, backport from 0.3.4.7-rc):
  8035. - Don't link or search for pthreads when building for Windows, even
  8036. if we are using build environment (like mingw) that provides a
  8037. pthreads library. Fixes bug 27081; bugfix on 0.1.0.1-rc.
  8038. o Minor bugfixes (continuous integration, backport from 0.3.4.6-rc):
  8039. - Skip a pair of unreliable key generation tests on Windows, until
  8040. the underlying issue in bug 26076 is resolved. Fixes bug 26830 and
  8041. bug 26853; bugfix on 0.2.7.3-rc and 0.3.2.1-alpha respectively.
  8042. o Minor bugfixes (continuous integration, backport from 0.3.4.7-rc):
  8043. - Pass the module flags to distcheck configure, and log the flags
  8044. before running configure. (Backported to 0.2.9 and later as a
  8045. precaution.) Fixes bug 27088; bugfix on 0.3.4.1-alpha.
  8046. o Minor bugfixes (continuous integration, backport from 0.3.4.8):
  8047. - When a Travis build fails, and showing a log fails, keep trying to
  8048. show the other logs. Fixes bug 27453; bugfix on 0.3.4.7-rc.
  8049. - When we use echo in Travis, don't pass a --flag as the first
  8050. argument. Fixes bug 27418; bugfix on 0.3.4.7-rc.
  8051. o Minor bugfixes (directory authority, backport from 0.3.4.6-rc):
  8052. - When voting for recommended versions, make sure that all of the
  8053. versions are well-formed and parsable. Fixes bug 26485; bugfix
  8054. on 0.1.1.6-alpha.
  8055. o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.4.7-rc):
  8056. - Fix a bug in out sandboxing rules for the openat() syscall.
  8057. Previously, no openat() call would be permitted, which would break
  8058. filesystem operations on recent glibc versions. Fixes bug 25440;
  8059. bugfix on 0.2.9.15. Diagnosis and patch from Daniel Pinto.
  8060. o Minor bugfixes (onion services, backport from 0.3.4.8):
  8061. - Silence a spurious compiler warning in
  8062. rend_client_send_introduction(). Fixes bug 27463; bugfix
  8063. on 0.1.1.2-alpha.
  8064. o Minor bugfixes (single onion services, Tor2web, backport from 0.3.4.6-rc):
  8065. - Log a protocol warning when single onion services or Tor2web clients
  8066. fail to authenticate direct connections to relays.
  8067. Fixes bug 26924; bugfix on 0.2.9.1-alpha.
  8068. o Minor bugfixes (testing, backport from 0.3.4.6-rc):
  8069. - Disable core dumps in test_bt.sh, to avoid failures in "make
  8070. distcheck". Fixes bug 26787; bugfix on 0.2.5.2-alpha.
  8071. o Minor bugfixes (testing, chutney, backport from 0.3.4.8):
  8072. - Before running make test-network-all, delete old logs and test
  8073. result files, to avoid spurious failures. Fixes bug 27295; bugfix
  8074. on 0.2.7.3-rc.
  8075. o Minor bugfixes (testing, openssl compatibility, backport from 0.3.4.7-rc):
  8076. - Our "tortls/cert_matches_key" unit test no longer relies on
  8077. OpenSSL internals. Previously, it relied on unsupported OpenSSL
  8078. behavior in a way that caused it to crash with OpenSSL 1.0.2p.
  8079. Fixes bug 27226; bugfix on 0.2.5.1-alpha.
  8080. o Minor bugfixes (Windows, compilation, backport from 0.3.4.7-rc):
  8081. - Silence a compilation warning on MSVC 2017 and clang-cl. Fixes bug
  8082. 27185; bugfix on 0.2.2.2-alpha.
  8083. Changes in version 0.3.2.12 - 2018-09-10
  8084. Tor 0.3.2.12 backport numerous fixes from later versions of Tor.
  8085. o Minor features (compatibility, backport from 0.3.4.8):
  8086. - Tell OpenSSL to maintain backward compatibility with previous
  8087. RSA1024/DH1024 users in Tor. With OpenSSL 1.1.1-pre6, these
  8088. ciphers are disabled by default. Closes ticket 27344.
  8089. o Minor features (continuous integration, backport from 0.3.4.7-rc):
  8090. - Enable macOS builds in our Travis CI configuration. Closes
  8091. ticket 24629.
  8092. - Install libcap-dev and libseccomp2-dev so these optional
  8093. dependencies get tested on Travis CI. Closes ticket 26560.
  8094. - Run asciidoc during Travis CI. Implements ticket 27087.
  8095. - Use ccache in our Travis CI configuration. Closes ticket 26952.
  8096. o Minor features (continuous integration, rust, backport from 0.3.4.7-rc):
  8097. - Use cargo cache in our Travis CI configuration. Closes
  8098. ticket 26952.
  8099. o Minor features (controller, backport from 0.3.4.6-rc):
  8100. - The control port now exposes the list of HTTPTunnelPorts and
  8101. ExtOrPorts via GETINFO net/listeners/httptunnel and
  8102. net/listeners/extor respectively. Closes ticket 26647.
  8103. o Minor features (directory authorities, backport from 0.3.4.7-rc):
  8104. - Authorities no longer vote to make the subprotocol version
  8105. "LinkAuth=1" a requirement: it is unsupportable with NSS, and
  8106. hasn't been needed since Tor 0.3.0.1-alpha. Closes ticket 27286.
  8107. o Minor features (geoip):
  8108. - Update geoip and geoip6 to the August 7 2018 Maxmind GeoLite2
  8109. Country database. Closes ticket 27089.
  8110. o Minor bugfixes (compilation, backport from 0.3.4.6-rc):
  8111. - When compiling with --enable-openbsd-malloc or --enable-tcmalloc,
  8112. tell the compiler not to include the system malloc implementation.
  8113. Fixes bug 20424; bugfix on 0.2.0.20-rc.
  8114. - Don't try to use a pragma to temporarily disable the
  8115. -Wunused-const-variable warning if the compiler doesn't support
  8116. it. Fixes bug 26785; bugfix on 0.3.2.11.
  8117. o Minor bugfixes (compilation, backport from 0.3.4.7-rc):
  8118. - Silence a spurious compiler warning on the GetAdaptersAddresses
  8119. function pointer cast. This issue is already fixed by 26481 in
  8120. 0.3.5 and later, by removing the lookup and cast. Fixes bug 27465;
  8121. bugfix on 0.2.3.11-alpha.
  8122. - Stop calling SetProcessDEPPolicy() on 64-bit Windows. It is not
  8123. supported, and always fails. Some compilers warn about the
  8124. function pointer cast on 64-bit Windows. Fixes bug 27461; bugfix
  8125. on 0.2.2.23-alpha.
  8126. o Minor bugfixes (compilation, windows, backport from 0.3.4.7-rc):
  8127. - Don't link or search for pthreads when building for Windows, even
  8128. if we are using build environment (like mingw) that provides a
  8129. pthreads library. Fixes bug 27081; bugfix on 0.1.0.1-rc.
  8130. o Minor bugfixes (continuous integration, backport from 0.3.4.6-rc):
  8131. - Skip a pair of unreliable key generation tests on Windows, until
  8132. the underlying issue in bug 26076 is resolved. Fixes bug 26830 and
  8133. bug 26853; bugfix on 0.2.7.3-rc and 0.3.2.1-alpha respectively.
  8134. o Minor bugfixes (continuous integration, backport from 0.3.4.7-rc):
  8135. - Build with zstd on macOS. Fixes bug 27090; bugfix on 0.3.1.5-alpha.
  8136. - Pass the module flags to distcheck configure, and log the flags
  8137. before running configure. (Backported to 0.2.9 and later as a
  8138. precaution.) Fixes bug 27088; bugfix on 0.3.4.1-alpha.
  8139. o Minor bugfixes (continuous integration, backport from 0.3.4.8):
  8140. - When a Travis build fails, and showing a log fails, keep trying to
  8141. show the other logs. Fixes bug 27453; bugfix on 0.3.4.7-rc.
  8142. - When we use echo in Travis, don't pass a --flag as the first
  8143. argument. Fixes bug 27418; bugfix on 0.3.4.7-rc.
  8144. o Minor bugfixes (directory authority, backport from 0.3.4.6-rc):
  8145. - When voting for recommended versions, make sure that all of the
  8146. versions are well-formed and parsable. Fixes bug 26485; bugfix
  8147. on 0.1.1.6-alpha.
  8148. o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.4.7-rc):
  8149. - Fix a bug in out sandboxing rules for the openat() syscall.
  8150. Previously, no openat() call would be permitted, which would break
  8151. filesystem operations on recent glibc versions. Fixes bug 25440;
  8152. bugfix on 0.2.9.15. Diagnosis and patch from Daniel Pinto.
  8153. o Minor bugfixes (logging, backport from 0.3.4.6-rc):
  8154. - Improve the log message when connection initiators fail to
  8155. authenticate direct connections to relays. Fixes bug 26927; bugfix
  8156. on 0.3.0.1-alpha.
  8157. o Minor bugfixes (onion services, backport from 0.3.4.7-rc):
  8158. - Fix bug that causes services to not ever rotate their descriptors
  8159. if they were getting SIGHUPed often. Fixes bug 26932; bugfix
  8160. on 0.3.2.1-alpha.
  8161. o Minor bugfixes (onion services, backport from 0.3.4.8):
  8162. - Silence a spurious compiler warning in
  8163. rend_client_send_introduction(). Fixes bug 27463; bugfix
  8164. on 0.1.1.2-alpha.
  8165. o Minor bugfixes (rust, backport from 0.3.4.7-rc):
  8166. - Backport test_rust.sh from master. Fixes bug 26497; bugfix
  8167. on 0.3.1.5-alpha.
  8168. - Consistently use ../../.. as a fallback for $abs_top_srcdir in
  8169. test_rust.sh. Fixes bug 27093; bugfix on 0.3.4.3-alpha.
  8170. - Stop setting $CARGO_HOME. cargo will use the user's $CARGO_HOME, or
  8171. $HOME/.cargo by default. Fixes bug 26497; bugfix on 0.3.1.5-alpha.
  8172. o Minor bugfixes (single onion services, Tor2web, backport from 0.3.4.6-rc):
  8173. - Log a protocol warning when single onion services or Tor2web clients
  8174. fail to authenticate direct connections to relays.
  8175. Fixes bug 26924; bugfix on 0.2.9.1-alpha.
  8176. o Minor bugfixes (testing, backport from 0.3.4.6-rc):
  8177. - Disable core dumps in test_bt.sh, to avoid failures in "make
  8178. distcheck". Fixes bug 26787; bugfix on 0.2.5.2-alpha.
  8179. o Minor bugfixes (testing, chutney, backport from 0.3.4.8):
  8180. - When running make test-network-all, use the mixed+hs-v2 network.
  8181. (A previous fix to chutney removed v3 onion services from the
  8182. mixed+hs-v23 network, so seeing "mixed+hs-v23" in tests is
  8183. confusing.) Fixes bug 27345; bugfix on 0.3.2.1-alpha.
  8184. - Before running make test-network-all, delete old logs and test
  8185. result files, to avoid spurious failures. Fixes bug 27295; bugfix
  8186. on 0.2.7.3-rc.
  8187. o Minor bugfixes (testing, openssl compatibility):
  8188. - Our "tortls/cert_matches_key" unit test no longer relies on OpenSSL
  8189. internals. Previously, it relied on unsupported OpenSSL behavior in
  8190. a way that caused it to crash with OpenSSL 1.0.2p. Fixes bug 27226;
  8191. bugfix on 0.2.5.1-alpha.
  8192. o Minor bugfixes (testing, openssl compatibility, backport from 0.3.4.7-rc):
  8193. - Our "tortls/cert_matches_key" unit test no longer relies on
  8194. OpenSSL internals. Previously, it relied on unsupported OpenSSL
  8195. behavior in a way that caused it to crash with OpenSSL 1.0.2p.
  8196. Fixes bug 27226; bugfix on 0.2.5.1-alpha.
  8197. o Minor bugfixes (Windows, compilation, backport from 0.3.4.7-rc):
  8198. - Silence a compilation warning on MSVC 2017 and clang-cl. Fixes bug
  8199. 27185; bugfix on 0.2.2.2-alpha.
  8200. Changes in version 0.3.3.10 - 2018-09-10
  8201. Tor 0.3.3.10 backports numerous fixes from later versions of Tor.
  8202. o Minor features (bug workaround, backport from 0.3.4.7-rc):
  8203. - Compile correctly on systems that provide the C11 stdatomic.h
  8204. header, but where C11 atomic functions don't actually compile.
  8205. Closes ticket 26779; workaround for Debian issue 903709.
  8206. o Minor features (compatibility, backport from 0.3.4.8):
  8207. - Tell OpenSSL to maintain backward compatibility with previous
  8208. RSA1024/DH1024 users in Tor. With OpenSSL 1.1.1-pre6, these
  8209. ciphers are disabled by default. Closes ticket 27344.
  8210. o Minor features (continuous integration, backport from 0.3.4.7-rc):
  8211. - Backport Travis rust distcheck to 0.3.3. Closes ticket 24629.
  8212. - Enable macOS builds in our Travis CI configuration. Closes
  8213. ticket 24629.
  8214. - Install libcap-dev and libseccomp2-dev so these optional
  8215. dependencies get tested on Travis CI. Closes ticket 26560.
  8216. - Run asciidoc during Travis CI. Implements ticket 27087.
  8217. - Use ccache in our Travis CI configuration. Closes ticket 26952.
  8218. o Minor features (continuous integration, rust, backport from 0.3.4.7-rc):
  8219. - Use cargo cache in our Travis CI configuration. Closes
  8220. ticket 26952.
  8221. o Minor features (controller, backport from 0.3.4.6-rc):
  8222. - The control port now exposes the list of HTTPTunnelPorts and
  8223. ExtOrPorts via GETINFO net/listeners/httptunnel and
  8224. net/listeners/extor respectively. Closes ticket 26647.
  8225. o Minor features (directory authorities, backport from 0.3.4.7-rc):
  8226. - Authorities no longer vote to make the subprotocol version
  8227. "LinkAuth=1" a requirement: it is unsupportable with NSS, and
  8228. hasn't been needed since Tor 0.3.0.1-alpha. Closes ticket 27286.
  8229. o Minor features (geoip):
  8230. - Update geoip and geoip6 to the August 7 2018 Maxmind GeoLite2
  8231. Country database. Closes ticket 27089.
  8232. o Minor bugfixes (compilation, backport from 0.3.4.6-rc):
  8233. - When compiling with --enable-openbsd-malloc or --enable-tcmalloc,
  8234. tell the compiler not to include the system malloc implementation.
  8235. Fixes bug 20424; bugfix on 0.2.0.20-rc.
  8236. - Don't try to use a pragma to temporarily disable the
  8237. -Wunused-const-variable warning if the compiler doesn't support
  8238. it. Fixes bug 26785; bugfix on 0.3.2.11.
  8239. o Minor bugfixes (compilation, backport from 0.3.4.7-rc):
  8240. - Silence a spurious compiler warning on the GetAdaptersAddresses
  8241. function pointer cast. This issue is already fixed by 26481 in
  8242. 0.3.5 and later, by removing the lookup and cast. Fixes bug 27465;
  8243. bugfix on 0.2.3.11-alpha.
  8244. - Stop calling SetProcessDEPPolicy() on 64-bit Windows. It is not
  8245. supported, and always fails. Some compilers warn about the
  8246. function pointer cast on 64-bit Windows. Fixes bug 27461; bugfix
  8247. on 0.2.2.23-alpha.
  8248. o Minor bugfixes (compilation, windows, backport from 0.3.4.7-rc):
  8249. - Don't link or search for pthreads when building for Windows, even
  8250. if we are using build environment (like mingw) that provides a
  8251. pthreads library. Fixes bug 27081; bugfix on 0.1.0.1-rc.
  8252. o Minor bugfixes (continuous integration, backport from 0.3.4.6-rc):
  8253. - Skip a pair of unreliable key generation tests on Windows, until
  8254. the underlying issue in bug 26076 is resolved. Fixes bug 26830 and
  8255. bug 26853; bugfix on 0.2.7.3-rc and 0.3.2.1-alpha respectively.
  8256. o Minor bugfixes (continuous integration, backport from 0.3.4.7-rc):
  8257. - Build with zstd on macOS. Fixes bug 27090; bugfix on 0.3.1.5-alpha.
  8258. - Pass the module flags to distcheck configure, and log the flags
  8259. before running configure. (Backported to 0.2.9 and later as a
  8260. precaution.) Fixes bug 27088; bugfix on 0.3.4.1-alpha.
  8261. o Minor bugfixes (continuous integration, backport from 0.3.4.8):
  8262. - When a Travis build fails, and showing a log fails, keep trying to
  8263. show the other logs. Fixes bug 27453; bugfix on 0.3.4.7-rc.
  8264. - When we use echo in Travis, don't pass a --flag as the first
  8265. argument. Fixes bug 27418; bugfix on 0.3.4.7-rc.
  8266. o Minor bugfixes (directory authority, backport from 0.3.4.6-rc):
  8267. - When voting for recommended versions, make sure that all of the
  8268. versions are well-formed and parsable. Fixes bug 26485; bugfix
  8269. on 0.1.1.6-alpha.
  8270. o Minor bugfixes (in-process restart, backport from 0.3.4.7-rc):
  8271. - Always call tor_free_all() when leaving tor_run_main(). When we
  8272. did not, restarting tor in-process would cause an assertion
  8273. failure. Fixes bug 26948; bugfix on 0.3.3.1-alpha.
  8274. o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.4.7-rc):
  8275. - Fix a bug in our sandboxing rules for the openat() syscall.
  8276. Previously, no openat() call would be permitted, which would break
  8277. filesystem operations on recent glibc versions. Fixes bug 25440;
  8278. bugfix on 0.2.9.15. Diagnosis and patch from Daniel Pinto.
  8279. o Minor bugfixes (logging, backport from 0.3.4.6-rc):
  8280. - Improve the log message when connection initiators fail to
  8281. authenticate direct connections to relays. Fixes bug 26927; bugfix
  8282. on 0.3.0.1-alpha.
  8283. o Minor bugfixes (onion services, backport from 0.3.4.7-rc):
  8284. - Fix bug that causes services to not ever rotate their descriptors
  8285. if they were getting SIGHUPed often. Fixes bug 26932; bugfix
  8286. on 0.3.2.1-alpha.
  8287. o Minor bugfixes (onion services, backport from 0.3.4.8):
  8288. - Silence a spurious compiler warning in
  8289. rend_client_send_introduction(). Fixes bug 27463; bugfix
  8290. on 0.1.1.2-alpha.
  8291. o Minor bugfixes (portability, backport from 0.3.4.6-rc):
  8292. - Work around two different bugs in the OS X 10.10 and later SDKs
  8293. that would prevent us from successfully targeting earlier versions
  8294. of OS X. Fixes bug 26876; bugfix on 0.3.3.1-alpha.
  8295. o Minor bugfixes (portability, backport from 0.3.4.7-rc):
  8296. - Fix compilation of the unit tests on GNU/Hurd, which does not
  8297. define PATH_MAX. Fixes bug 26873; bugfix on 0.3.3.1-alpha. Patch
  8298. from "paulusASol".
  8299. o Minor bugfixes (rust, backport from 0.3.4.7-rc):
  8300. - Backport test_rust.sh from master. Fixes bug 26497; bugfix
  8301. on 0.3.1.5-alpha.
  8302. - Consistently use ../../.. as a fallback for $abs_top_srcdir in
  8303. test_rust.sh. Fixes bug 27093; bugfix on 0.3.4.3-alpha.
  8304. - Protover parsing was accepting the presence of whitespace in
  8305. version strings, which the C implementation would choke on, e.g.
  8306. "Desc=1\t,2". Fixes bug 27177; bugfix on 0.3.3.5-rc.
  8307. - Protover parsing was ignoring a 2nd hyphen and everything after
  8308. it, accepting entries like "Link=1-5-foo". Fixes bug 27164; bugfix
  8309. on 0.3.3.1-alpha.
  8310. - Stop setting $CARGO_HOME. cargo will use the user's $CARGO_HOME, or
  8311. $HOME/.cargo by default. Fixes bug 26497; bugfix on 0.3.1.5-alpha.
  8312. - cd to ${abs_top_builddir}/src/rust before running cargo in
  8313. src/test/test_rust.sh. This makes the working directory consistent
  8314. between builds and tests. Fixes bug 26497; bugfix on 0.3.3.2-alpha.
  8315. o Minor bugfixes (single onion services, Tor2web, backport from 0.3.4.6-rc):
  8316. - Log a protocol warning when single onion services or Tor2web clients
  8317. fail to authenticate direct connections to relays.
  8318. Fixes bug 26924; bugfix on 0.2.9.1-alpha.
  8319. o Minor bugfixes (testing, backport from 0.3.4.6-rc):
  8320. - Disable core dumps in test_bt.sh, to avoid failures in "make
  8321. distcheck". Fixes bug 26787; bugfix on 0.2.5.2-alpha.
  8322. o Minor bugfixes (testing, chutney, backport from 0.3.4.8):
  8323. - When running make test-network-all, use the mixed+hs-v2 network.
  8324. (A previous fix to chutney removed v3 onion services from the
  8325. mixed+hs-v23 network, so seeing "mixed+hs-v23" in tests is
  8326. confusing.) Fixes bug 27345; bugfix on 0.3.2.1-alpha.
  8327. - Before running make test-network-all, delete old logs and test
  8328. result files, to avoid spurious failures. Fixes bug 27295; bugfix
  8329. on 0.2.7.3-rc.
  8330. o Minor bugfixes (testing, openssl compatibility, backport from 0.3.4.7-rc):
  8331. - Our "tortls/cert_matches_key" unit test no longer relies on
  8332. OpenSSL internals. Previously, it relied on unsupported OpenSSL
  8333. behavior in a way that caused it to crash with OpenSSL 1.0.2p.
  8334. Fixes bug 27226; bugfix on 0.2.5.1-alpha.
  8335. o Minor bugfixes (v3 onion services, backport from 0.3.4.6-rc):
  8336. - Stop sending ed25519 link specifiers in v3 onion service introduce
  8337. cells and descriptors, when the rendezvous or introduction point
  8338. doesn't support ed25519 link authentication. Fixes bug 26627;
  8339. bugfix on 0.3.2.4-alpha.
  8340. o Minor bugfixes (Windows, compilation, backport from 0.3.4.7-rc):
  8341. - Silence a compilation warning on MSVC 2017 and clang-cl. Fixes bug
  8342. 27185; bugfix on 0.2.2.2-alpha.
  8343. Changes in version 0.3.4.8 - 2018-09-10
  8344. Tor 0.3.4.8 is the first stable release in its series; it includes
  8345. compilation and portability fixes.
  8346. The Tor 0.3.4 series includes improvements for running Tor in
  8347. low-power and embedded environments, which should help performance in
  8348. general. We've begun work on better modularity, and included preliminary
  8349. changes on the directory authority side to accommodate a new bandwidth
  8350. measurement system. We've also integrated more continuous-integration
  8351. systems into our development process, and made corresponding changes to
  8352. Tor's testing infrastructure. Finally, we've continued to refine
  8353. our anti-denial-of-service code.
  8354. Below are the changes since 0.3.3.9. For a list of only the changes
  8355. since 0.3.4.7-rc, see the ChangeLog file.
  8356. o New system requirements:
  8357. - Tor no longer tries to support old operating systems without
  8358. mmap() or some local equivalent. Apparently, compilation on such
  8359. systems has been broken for some time, without anybody noticing or
  8360. complaining. Closes ticket 25398.
  8361. o Major features (directory authority, modularization):
  8362. - The directory authority subsystem has been modularized. The code
  8363. is now located in src/or/dirauth/, and is compiled in by default.
  8364. To disable the module, the configure option
  8365. --disable-module-dirauth has been added. This module may be
  8366. disabled by default in some future release. Closes ticket 25610.
  8367. o Major features (main loop, CPU usage):
  8368. - When Tor is disabled (via DisableNetwork or via hibernation), it
  8369. no longer needs to run any per-second events. This change should
  8370. make it easier for mobile applications to disable Tor while the
  8371. device is sleeping, or Tor is not running. Closes ticket 26063.
  8372. - Tor no longer enables all of its periodic events by default.
  8373. Previously, Tor would enable all possible main loop events,
  8374. regardless of whether it needed them. Furthermore, many of these
  8375. events are now disabled when Tor is hibernating or DisableNetwork
  8376. is set. This is a big step towards reducing client CPU usage by
  8377. reducing the amount of wake-ups the daemon does. Closes tickets
  8378. 25376 and 25762.
  8379. - The bandwidth-limitation logic has been refactored so that
  8380. bandwidth calculations are performed on-demand, rather than every
  8381. TokenBucketRefillInterval milliseconds. This change should improve
  8382. the granularity of our bandwidth calculations, and limit the
  8383. number of times that the Tor process needs to wake up when it is
  8384. idle. Closes ticket 25373.
  8385. - Move responsibility for many operations from a once-per-second
  8386. callback to a callback that is only scheduled as needed. Moving
  8387. this functionality has allowed us to disable the callback when
  8388. Tor's network is disabled. Once enough items are removed from our
  8389. once-per-second callback, we can eliminate it entirely to conserve
  8390. CPU when idle. The functionality removed includes: closing
  8391. connections, circuits, and channels (ticket 25932); consensus
  8392. voting (25937); flushing log callbacks (25951); honoring delayed
  8393. SIGNEWNYM requests (25949); rescanning the consensus cache
  8394. (25931); saving the state file to disk (25948); warning relay
  8395. operators about unreachable ports (25952); and keeping track of
  8396. Tor's uptime (26009).
  8397. o Minor features (accounting):
  8398. - When Tor becomes dormant, it now uses a scheduled event to wake up
  8399. at the right time. Previously, we would use the per-second timer
  8400. to check whether to wake up, but we no longer have any per-second
  8401. timers enabled when the network is disabled. Closes ticket 26064.
  8402. o Minor features (bug workaround):
  8403. - Compile correctly on systems that provide the C11 stdatomic.h
  8404. header, but where C11 atomic functions don't actually compile.
  8405. Closes ticket 26779; workaround for Debian issue 903709.
  8406. o Minor features (code quality):
  8407. - Add optional spell-checking for the Tor codebase, using the
  8408. "misspell" program. To use this feature, run "make check-typos".
  8409. Closes ticket 25024.
  8410. o Minor features (compatibility):
  8411. - Tell OpenSSL to maintain backward compatibility with previous
  8412. RSA1024/DH1024 users in Tor. With OpenSSL 1.1.1-pre6, these
  8413. ciphers are disabled by default. Closes ticket 27344.
  8414. - Tor now detects versions of OpenSSL 1.1.0 and later compiled with
  8415. the no-deprecated option, and builds correctly with them. Closes
  8416. tickets 19429, 19981, and 25353.
  8417. o Minor features (compilation):
  8418. - When compiling with --enable-openbsd-malloc or --enable-tcmalloc,
  8419. tell the compiler not to include the system malloc implementation.
  8420. Fixes bug 20424; bugfix on 0.2.0.20-rc.
  8421. - Don't try to use a pragma to temporarily disable the
  8422. -Wunused-const-variable warning if the compiler doesn't support
  8423. it. Fixes bug 26785; bugfix on 0.3.2.11.
  8424. - When building Tor, prefer to use Python 3 over Python 2, and more
  8425. recent (contemplated) versions over older ones. Closes
  8426. ticket 26372.
  8427. o Minor features (compression, zstd):
  8428. - When running with zstd, Tor now considers using advanced functions
  8429. that the zstd maintainers have labeled as potentially unstable. To
  8430. prevent breakage, Tor will only use this functionality when the
  8431. runtime version of the zstd library matches the version with which
  8432. Tor was compiled. Closes ticket 25162.
  8433. o Minor features (configuration):
  8434. - The "DownloadSchedule" options have been renamed to end with
  8435. "DownloadInitialDelay". The old names are still allowed, but will
  8436. produce a warning. Comma-separated lists are still permitted for
  8437. these options, but all values after the first are ignored (as they
  8438. have been since 0.2.9). Closes ticket 23354.
  8439. o Minor features (continuous integration):
  8440. - Log the compiler path and version during Appveyor builds.
  8441. Implements ticket 27449.
  8442. - Show config.log and test-suite.log after failed Appveyor builds.
  8443. Also upload the zipped full logs as a build artifact. Implements
  8444. ticket 27430.
  8445. - Backport Travis rust distcheck to 0.3.3. Closes ticket 24629.
  8446. - Enable macOS builds in our Travis CI configuration. Closes
  8447. ticket 24629.
  8448. - Install libcap-dev and libseccomp2-dev so these optional
  8449. dependencies get tested on Travis CI. Closes ticket 26560.
  8450. - Only post Appveyor IRC notifications when the build fails.
  8451. Implements ticket 27275.
  8452. - Run asciidoc during Travis CI. Implements ticket 27087.
  8453. - Use ccache in our Travis CI configuration. Closes ticket 26952.
  8454. - Add the necessary configuration files for continuous integration
  8455. testing on Windows, via the Appveyor platform. Closes ticket
  8456. 25549. Patches from Marcin Cieślak and Isis Lovecruft.
  8457. o Minor features (continuous integration, rust):
  8458. - Use cargo cache in our Travis CI configuration. Closes
  8459. ticket 26952.
  8460. o Minor features (control port):
  8461. - Introduce GETINFO "current-time/{local,utc}" to return the local
  8462. and UTC times respectively in ISO format. This helps a controller
  8463. like Tor Browser detect a time-related error. Closes ticket 25511.
  8464. Patch by Neel Chauhan.
  8465. - Introduce new fields to the CIRC_BW event. There are two new
  8466. fields in each of the read and written directions. The DELIVERED
  8467. fields report the total valid data on the circuit, as measured by
  8468. the payload sizes of verified and error-checked relay command
  8469. cells. The OVERHEAD fields report the total unused bytes in each
  8470. of these cells. Closes ticket 25903.
  8471. o Minor features (controller):
  8472. - The control port now exposes the list of HTTPTunnelPorts and
  8473. ExtOrPorts via GETINFO net/listeners/httptunnel and
  8474. net/listeners/extor respectively. Closes ticket 26647.
  8475. o Minor features (directory authorities):
  8476. - Stop warning about incomplete bw lines before the first complete
  8477. bw line has been found, so that additional header lines can be
  8478. ignored. Fixes bug 25960; bugfix on 0.2.2.1-alpha
  8479. - Authorities no longer vote to make the subprotocol version
  8480. "LinkAuth=1" a requirement: it is unsupportable with NSS, and
  8481. hasn't been needed since Tor 0.3.0.1-alpha. Closes ticket 27286.
  8482. o Minor features (directory authority):
  8483. - Directory authorities now open their key-pinning files as O_SYNC,
  8484. to limit their chances of accidentally writing partial lines.
  8485. Closes ticket 23909.
  8486. o Minor features (directory authority, forward compatibility):
  8487. - Make the lines of the measured bandwidth file able to contain
  8488. their entries in any order. Previously, the node_id entry needed
  8489. to come first. Closes ticket 26004.
  8490. o Minor features (entry guards):
  8491. - Introduce a new torrc option NumPrimaryGuards for controlling the
  8492. number of primary guards. Closes ticket 25843.
  8493. o Minor features (geoip):
  8494. - Update geoip and geoip6 to the August 7 2018 Maxmind GeoLite2
  8495. Country database. Closes ticket 27089.
  8496. o Minor features (performance):
  8497. - Avoid a needless call to malloc() when processing an incoming
  8498. relay cell. Closes ticket 24914.
  8499. - Make our timing-wheel code run a tiny bit faster on 32-bit
  8500. platforms, by preferring 32-bit math to 64-bit. Closes
  8501. ticket 24688.
  8502. - Avoid a needless malloc()/free() pair every time we handle an ntor
  8503. handshake. Closes ticket 25150.
  8504. o Minor features (Rust, portability):
  8505. - Rust cross-compilation is now supported. Closes ticket 25895.
  8506. o Minor features (testing):
  8507. - Add a unit test for voting_schedule_get_start_of_next_interval().
  8508. Closes ticket 26014, and helps make unit test coverage
  8509. more deterministic.
  8510. - A new unittests module specifically for testing the functions in
  8511. the (new-ish) bridges.c module has been created with new
  8512. unittests, raising the code coverage percentages. Closes 25425.
  8513. - We now have improved testing for addressmap_get_virtual_address()
  8514. function. This should improve our test coverage, and make our test
  8515. coverage more deterministic. Closes ticket 25993.
  8516. o Minor features (timekeeping, circuit scheduling):
  8517. - When keeping track of how busy each circuit have been recently on
  8518. a given connection, use coarse-grained monotonic timers rather
  8519. than gettimeofday(). This change should marginally increase
  8520. accuracy and performance. Implements part of ticket 25927.
  8521. o Minor features (unit tests):
  8522. - Test complete bandwidth measurements files, and test that
  8523. incomplete bandwidth lines only give warnings when the end of the
  8524. header has not been detected. Fixes bug 25947; bugfix
  8525. on 0.2.2.1-alpha
  8526. o Minor bugfixes (bandwidth management):
  8527. - Consider ourselves "low on write bandwidth" if we have exhausted
  8528. our write bandwidth some time in the last second. This was the
  8529. documented behavior before, but the actual behavior was to change
  8530. this value every TokenBucketRefillInterval. Fixes bug 25828;
  8531. bugfix on 0.2.3.5-alpha.
  8532. o Minor bugfixes (C correctness):
  8533. - Add a missing lock acquisition in the shutdown code of the control
  8534. subsystem. Fixes bug 25675; bugfix on 0.2.7.3-rc. Found by
  8535. Coverity; this is CID 1433643.
  8536. o Minor bugfixes (code style):
  8537. - Fixed multiple includes of transports.h in src/or/connection.c
  8538. Fixes bug 25261; bugfix on 0.2.5.1-alpha.
  8539. - Remove the unused variable n_possible from the function
  8540. channel_get_for_extend(). Fixes bug 25645; bugfix on 0.2.4.4-alpha
  8541. o Minor bugfixes (compilation):
  8542. - Silence a spurious compiler warning on the GetAdaptersAddresses
  8543. function pointer cast. This issue is already fixed by 26481 in
  8544. 0.3.5 and later, by removing the lookup and cast. Fixes bug 27465;
  8545. bugfix on 0.2.3.11-alpha.
  8546. - Stop calling SetProcessDEPPolicy() on 64-bit Windows. It is not
  8547. supported, and always fails. Some compilers warn about the
  8548. function pointer cast on 64-bit Windows. Fixes bug 27461; bugfix
  8549. on 0.2.2.23-alpha.
  8550. - Fix a compilation warning on some versions of GCC when building
  8551. code that calls routerinfo_get_my_routerinfo() twice, assuming
  8552. that the second call will succeed if the first one did. Fixes bug
  8553. 26269; bugfix on 0.2.8.2-alpha.
  8554. - Refrain from compiling unit testing related object files when
  8555. --disable-unittests is set to configure script. Fixes bug 24891;
  8556. bugfix on 0.2.5.1-alpha.
  8557. - The --enable-fatal-warnings flag now affects Rust code as well.
  8558. Closes ticket 26245.
  8559. - Avoid a compiler warning when casting the return value of
  8560. smartlist_len() to double with DEBUG_SMARTLIST enabled. Fixes bug
  8561. 26283; bugfix on 0.2.4.10-alpha.
  8562. o Minor bugfixes (compilation, windows):
  8563. - Don't link or search for pthreads when building for Windows, even
  8564. if we are using build environment (like mingw) that provides a
  8565. pthreads library. Fixes bug 27081; bugfix on 0.1.0.1-rc.
  8566. o Minor bugfixes (continuous integration):
  8567. - Build with zstd on macOS. Fixes bug 27090; bugfix on 0.3.1.5-alpha.
  8568. - Skip a pair of unreliable key generation tests on Windows, until
  8569. the underlying issue in bug 26076 is resolved. Fixes bug 26830 and
  8570. bug 26853; bugfix on 0.2.7.3-rc and 0.3.2.1-alpha respectively.
  8571. o Minor bugfixes (control port):
  8572. - Respond with more human-readable error messages to GETINFO exit-
  8573. policy/* requests. Also, let controller know if an error is
  8574. transient (response code 551) or not (response code 552). Fixes
  8575. bug 25852; bugfix on 0.2.8.1-alpha.
  8576. - Parse the "HSADDRESS=" parameter in HSPOST commands properly.
  8577. Previously, it was misparsed and ignored. Fixes bug 26523; bugfix
  8578. on 0.3.3.1-alpha. Patch by "akwizgran".
  8579. - Make CIRC_BW event reflect the total of all data sent on a
  8580. circuit, including padding and dropped cells. Also fix a mis-
  8581. counting bug when STREAM_BW events were enabled. Fixes bug 25400;
  8582. bugfix on 0.2.5.2-alpha.
  8583. o Minor bugfixes (correctness, flow control):
  8584. - Upon receiving a stream-level SENDME cell, verify that our window
  8585. has not grown too large. Fixes bug 26214; bugfix on svn
  8586. r54 (pre-0.0.1).
  8587. o Minor bugfixes (directory authority):
  8588. - When voting for recommended versions, make sure that all of the
  8589. versions are well-formed and parsable. Fixes bug 26485; bugfix
  8590. on 0.1.1.6-alpha.
  8591. o Minor bugfixes (directory client):
  8592. - When unverified-consensus is verified, rename it to cached-
  8593. consenus. Fixes bug 4187; bugfix on 0.2.0.3-alpha.
  8594. - Fixed launching a certificate fetch always during the scheduled
  8595. periodic consensus fetch by fetching only in those cases when
  8596. consensus are waiting for certs. Fixes bug 24740; bugfix
  8597. on 0.2.9.1-alpha.
  8598. o Minor bugfixes (error reporting):
  8599. - Improve tolerance for directory authorities with skewed clocks.
  8600. Previously, an authority with a clock more than 60 seconds ahead
  8601. could cause a client with a correct clock to warn that the
  8602. client's clock was behind. Now the clocks of a majority of
  8603. directory authorities have to be ahead of the client before this
  8604. warning will occur. Fixes bug 25756; bugfix on 0.2.2.25-alpha.
  8605. o Minor bugfixes (in-process restart):
  8606. - Always call tor_free_all() when leaving tor_run_main(). When we
  8607. did not, restarting tor in-process would cause an assertion
  8608. failure. Fixes bug 26948; bugfix on 0.3.3.1-alpha.
  8609. o Minor bugfixes (Linux seccomp2 sandbox):
  8610. - Fix a bug in our sandboxing rules for the openat() syscall.
  8611. Previously, no openat() call would be permitted, which would break
  8612. filesystem operations on recent glibc versions. Fixes bug 25440;
  8613. bugfix on 0.2.9.15. Diagnosis and patch from Daniel Pinto.
  8614. o Minor bugfixes (logging):
  8615. - Improve the log message when connection initiators fail to
  8616. authenticate direct connections to relays. Fixes bug 26927; bugfix
  8617. on 0.3.0.1-alpha.
  8618. o Minor bugfixes (onion services):
  8619. - Silence a spurious compiler warning in
  8620. rend_client_send_introduction(). Fixes bug 27463; bugfix
  8621. on 0.1.1.2-alpha.
  8622. - Fix bug that causes services to not ever rotate their descriptors
  8623. if they were getting SIGHUPed often. Fixes bug 26932; bugfix
  8624. on 0.3.2.1-alpha.
  8625. - Recompute some consensus information after detecting a clock jump,
  8626. or after transitioning from a non-live consensus to a live
  8627. consensus. We do this to avoid having an outdated state, and
  8628. miscalculating the index for next-generation onion services. Fixes
  8629. bug 24977; bugfix on 0.3.2.1-alpha.
  8630. o Minor bugfixes (portability):
  8631. - Fix compilation of the unit tests on GNU/Hurd, which does not
  8632. define PATH_MAX. Fixes bug 26873; bugfix on 0.3.3.1-alpha. Patch
  8633. from "paulusASol".
  8634. - Work around two different bugs in the OS X 10.10 and later SDKs
  8635. that would prevent us from successfully targeting earlier versions
  8636. of OS X. Fixes bug 26876; bugfix on 0.3.3.1-alpha.
  8637. - Do not align mmap length, as it is not required by POSIX, and the
  8638. getpagesize function is deprecated. Fixes bug 25399; bugfix
  8639. on 0.1.1.23.
  8640. o Minor bugfixes (portability, FreeBSD):
  8641. - In have_enough_mem_for_dircache(), the variable DIRCACHE_MIN_MEM_MB
  8642. does not stringify on FreeBSD, so we switch to tor_asprintf().
  8643. Fixes bug 20887; bugfix on 0.2.8.1-alpha. Patch by Neel Chauhan.
  8644. o Minor bugfixes (relay statistics):
  8645. - When a relay is collecting internal statistics about how many
  8646. create cell requests it has seen of each type, accurately count
  8647. the requests from relays that temporarily fall out of the
  8648. consensus. (To be extra conservative, we were already ignoring
  8649. requests from clients in our counts, and we continue ignoring them
  8650. here.) Fixes bug 24910; bugfix on 0.2.4.17-rc.
  8651. o Minor bugfixes (rust):
  8652. - Backport test_rust.sh from master. Fixes bug 26497; bugfix
  8653. on 0.3.1.5-alpha.
  8654. - Protover parsing was accepting the presence of whitespace in
  8655. version strings, which the C implementation would choke on, e.g.
  8656. "Desc=1\t,2". Fixes bug 27177; bugfix on 0.3.3.5-rc.
  8657. - Protover parsing was ignoring a 2nd hyphen and everything after
  8658. it, accepting entries like "Link=1-5-foo". Fixes bug 27164; bugfix
  8659. on 0.3.3.1-alpha.
  8660. - Stop setting $CARGO_HOME. cargo will use the user's $CARGO_HOME, or
  8661. $HOME/.cargo by default. Fixes bug 26497; bugfix on 0.3.1.5-alpha.
  8662. - cd to ${abs_top_builddir}/src/rust before running cargo in
  8663. src/test/test_rust.sh. This makes the working directory consistent
  8664. between builds and tests. Fixes bug 26497; bugfix on 0.3.3.2-alpha.
  8665. o Minor bugfixes (single onion services, Tor2web):
  8666. - Log a protocol warning when single onion services or Tor2web
  8667. clients fail to authenticate direct connections to relays. Fixes
  8668. bug 26924; bugfix on 0.2.9.1-alpha.
  8669. o Minor bugfixes (test coverage tools):
  8670. - Update our "cov-diff" script to handle output from the latest
  8671. version of gcov, and to remove extraneous timestamp information
  8672. from its output. Fixes bugs 26101 and 26102; bugfix
  8673. on 0.2.5.1-alpha.
  8674. o Minor bugfixes (testing):
  8675. - Disable core dumps in test_bt.sh, to avoid failures in "make
  8676. distcheck". Fixes bug 26787; bugfix on 0.2.5.2-alpha.
  8677. - When testing workqueue event-cancellation, make sure that we
  8678. actually cancel an event, and that cancel each event with equal
  8679. probability. (It was previously possible, though extremely
  8680. unlikely, for our event-canceling test not to cancel any events.)
  8681. Fixes bug 26008; bugfix on 0.2.6.3-alpha.
  8682. - Repeat part of the test in test_client_pick_intro() a number of
  8683. times, to give it consistent coverage. Fixes bug 25996; bugfix
  8684. on 0.3.2.1-alpha.
  8685. - Remove randomness from the hs_common/responsible_hsdirs test, so
  8686. that it always takes the same path through the function it tests.
  8687. Fixes bug 25997; bugfix on 0.3.2.1-alpha.
  8688. - Change the behavior of the "channel/outbound" test so that it
  8689. never causes a 10-second rollover for the EWMA circuitmux code.
  8690. Previously, this behavior would happen randomly, and result in
  8691. fluctuating test coverage. Fixes bug 25994; bugfix
  8692. on 0.3.3.1-alpha.
  8693. - Use X509_new() to allocate certificates that will be freed later
  8694. with X509_free(). Previously, some parts of the unit tests had
  8695. used tor_malloc_zero(), which is incorrect, and which caused test
  8696. failures on Windows when they were built with extra hardening.
  8697. Fixes bugs 25943 and 25944; bugfix on 0.2.8.1-alpha. Patch by
  8698. Marcin Cieślak.
  8699. - While running the circuit_timeout test, fix the PRNG to a
  8700. deterministic AES stream, so that the test coverage from this test
  8701. will itself be deterministic. Fixes bug 25995; bugfix
  8702. on 0.2.2.2-alpha.
  8703. o Minor bugfixes (testing, bootstrap):
  8704. - When calculating bootstrap progress, check exit policies and the
  8705. exit flag. Previously, Tor would only check the exit flag, which
  8706. caused race conditions in small and fast networks like chutney.
  8707. Fixes bug 27236; bugfix on 0.2.6.3-alpha.
  8708. o Minor bugfixes (testing, chutney):
  8709. - When running make test-network-all, use the mixed+hs-v2 network.
  8710. (A previous fix to chutney removed v3 onion services from the
  8711. mixed+hs-v23 network, so seeing "mixed+hs-v23" in tests is
  8712. confusing.) Fixes bug 27345; bugfix on 0.3.2.1-alpha.
  8713. - Before running make test-network-all, delete old logs and test
  8714. result files, to avoid spurious failures. Fixes bug 27295; bugfix
  8715. on 0.2.7.3-rc.
  8716. o Minor bugfixes (testing, openssl compatibility):
  8717. - Our "tortls/cert_matches_key" unit test no longer relies on
  8718. OpenSSL internals. Previously, it relied on unsupported OpenSSL
  8719. behavior in a way that caused it to crash with OpenSSL 1.0.2p.
  8720. Fixes bug 27226; bugfix on 0.2.5.1-alpha.
  8721. o Minor bugfixes (v3 onion services):
  8722. - Stop sending ed25519 link specifiers in v3 onion service introduce
  8723. cells and descriptors, when the rendezvous or introduction point
  8724. doesn't support ed25519 link authentication. Fixes bug 26627;
  8725. bugfix on 0.3.2.4-alpha.
  8726. o Minor bugfixes (vanguards):
  8727. - Allow the last hop in a vanguard circuit to be the same as our
  8728. first, to prevent the adversary from influencing guard node choice
  8729. by choice of last hop. Also prevent the creation of A - B - A
  8730. paths, or A - A paths, which are forbidden by relays. Fixes bug
  8731. 25870; bugfix on 0.3.3.1-alpha.
  8732. o Minor bugfixes (Windows, compilation):
  8733. - Silence a compilation warning on MSVC 2017 and clang-cl. Fixes bug
  8734. 27185; bugfix on 0.2.2.2-alpha.
  8735. o Code simplification and refactoring:
  8736. - Remove duplicate code in parse_{c,s}method_line and bootstrap
  8737. their functionalities into a single function. Fixes bug 6236;
  8738. bugfix on 0.2.3.6-alpha.
  8739. - We remove the PortForwarding and PortForwardingHelper options,
  8740. related functions, and the port_forwarding tests. These options
  8741. were used by the now-deprecated Vidalia to help ordinary users
  8742. become Tor relays or bridges. Closes ticket 25409. Patch by
  8743. Neel Chauhan.
  8744. - In order to make the OR and dir checking function in router.c less
  8745. confusing we renamed some functions and
  8746. consider_testing_reachability() has been split into
  8747. router_should_check_reachability() and
  8748. router_do_reachability_checks(). Also we improved the documentation
  8749. in some functions. Closes ticket 18918.
  8750. - Initial work to isolate Libevent usage to a handful of modules in
  8751. our codebase, to simplify our call structure, and so that we can
  8752. more easily change event loops in the future if needed. Closes
  8753. ticket 23750.
  8754. - Introduce a function to call getsockname() and return tor_addr_t,
  8755. to save a little complexity throughout the codebase. Closes
  8756. ticket 18105.
  8757. - Make hsdir_index in node_t a hsdir_index_t rather than a pointer
  8758. as hsdir_index is always present. Also, we move hsdir_index_t into
  8759. or.h. Closes ticket 23094. Patch by Neel Chauhan.
  8760. - Merge functions used for describing nodes and suppress the
  8761. functions that do not allocate memory for the output buffer
  8762. string. NODE_DESC_BUF_LEN constant and format_node_description()
  8763. function cannot be used externally from router.c module anymore.
  8764. Closes ticket 25432. Patch by valentecaio.
  8765. - Our main loop has been simplified so that all important operations
  8766. happen inside events. Previously, some operations had to happen
  8767. outside the event loop, to prevent infinite sequences of event
  8768. activations. Closes ticket 25374.
  8769. - Put a SHA1 public key digest in hs_service_intro_point_t, and use
  8770. it in register_intro_circ() and service_intro_point_new(). This
  8771. prevents the digest from being re-calculated each time. Closes
  8772. ticket 23107. Patch by Neel Chauhan.
  8773. - Refactor token-bucket implementations to use a common backend.
  8774. Closes ticket 25766.
  8775. - Remove extern declaration of stats_n_seconds_working variable from
  8776. main, protecting its accesses with get_uptime() and reset_uptime()
  8777. functions. Closes ticket 25081, patch by “valentecaio”.
  8778. - Remove our previous logic for "cached gettimeofday()" -- our
  8779. coarse monotonic timers are fast enough for this purpose, and far
  8780. less error-prone. Implements part of ticket 25927.
  8781. - Remove the return value for fascist_firewall_choose_address_base(),
  8782. and sister functions such as fascist_firewall_choose_address_node()
  8783. and fascist_firewall_choose_address_rs(). Also, while we're here,
  8784. initialize the ap argument as leaving it uninitialized can pose a
  8785. security hazard. Closes ticket 24734. Patch by Neel Chauhan.
  8786. - Rename two fields of connection_t struct. timestamp_lastwritten is
  8787. renamed to timestamp_last_write_allowed and timestamp_lastread is
  8788. renamed to timestamp_last_read_allowed. Closes ticket 24714, patch
  8789. by "valentecaio".
  8790. - Since Tor requires C99, remove our old workaround code for libc
  8791. implementations where free(NULL) doesn't work. Closes ticket 24484.
  8792. - Use our standard rate-limiting code to deal with excessive
  8793. libevent failures, rather than the hand-rolled logic we had
  8794. before. Closes ticket 26016.
  8795. - We remove the return value of node_get_prim_orport() and
  8796. node_get_prim_dirport(), and introduce node_get_prim_orport() in
  8797. node_ipv6_or_preferred() and node_ipv6_dir_preferred() in order to
  8798. check for a null address. Closes ticket 23873. Patch by
  8799. Neel Chauhan.
  8800. - We switch to should_record_bridge_info() in
  8801. geoip_note_client_seen() and options_need_geoip_info() instead of
  8802. accessing the configuration values directly. Fixes bug 25290;
  8803. bugfix on 0.2.1.6-alpha. Patch by Neel Chauhan.
  8804. o Deprecated features:
  8805. - As we are not recommending 0.2.5 anymore, we require relays that
  8806. once had an ed25519 key associated with their RSA key to always
  8807. have that key, instead of allowing them to drop back to a version
  8808. that didn't support ed25519. This means they need to use a new RSA
  8809. key if they want to downgrade to an older version of tor without
  8810. ed25519. Closes ticket 20522.
  8811. o Removed features:
  8812. - Directory authorities will no longer support voting according to
  8813. any consensus method before consensus method 25. This keeps
  8814. authorities compatible with all authorities running 0.2.9.8 and
  8815. later, and does not break any clients or relays. Implements ticket
  8816. 24378 and proposal 290.
  8817. - The PortForwarding and PortForwardingHelper features have been
  8818. removed. The reasoning is, given that implementations of NAT
  8819. traversal protocols within common consumer grade routers are
  8820. frequently buggy, and that the target audience for a NAT punching
  8821. feature is a perhaps less-technically-inclined relay operator,
  8822. when the helper fails to setup traversal the problems are usually
  8823. deep, ugly, and very router specific, making them horrendously
  8824. impossible for technical support to reliable assist with, and thus
  8825. resulting in frustration all around. Unfortunately, relay
  8826. operators who would like to run relays behind NATs will need to
  8827. become more familiar with the port forwarding configurations on
  8828. their local router. Closes 25409.
  8829. - The TestingEnableTbEmptyEvent option has been removed. It was used
  8830. in testing simulations to measure how often connection buckets
  8831. were emptied, in order to improve our scheduling, but it has not
  8832. been actively used in years. Closes ticket 25760.
  8833. - The old "round-robin" circuit multiplexer (circuitmux)
  8834. implementation has been removed, along with a fairly large set of
  8835. code that existed to support it. It has not been the default
  8836. circuitmux since we introduced the "EWMA" circuitmux in 0.2.4.x,
  8837. but it still required an unreasonable amount of memory and CPU.
  8838. Closes ticket 25268.
  8839. Changes in version 0.3.3.9 - 2018-07-13
  8840. Tor 0.3.3.9 moves to a new bridge authority, meaning people running
  8841. bridge relays should upgrade.
  8842. o Directory authority changes:
  8843. - The "Bifroest" bridge authority has been retired; the new bridge
  8844. authority is "Serge", and it is operated by George from the
  8845. TorBSD project. Closes ticket 26771.
  8846. Changes in version 0.3.2.11 - 2018-07-13
  8847. Tor 0.3.2.11 moves to a new bridge authority, meaning people running
  8848. bridge relays should upgrade. We also take this opportunity to backport
  8849. other minor fixes.
  8850. o Directory authority changes:
  8851. - The "Bifroest" bridge authority has been retired; the new bridge
  8852. authority is "Serge", and it is operated by George from the
  8853. TorBSD project. Closes ticket 26771.
  8854. o Directory authority changes (backport from 0.3.3.7):
  8855. - Add an IPv6 address for the "dannenberg" directory authority.
  8856. Closes ticket 26343.
  8857. o Major bugfixes (directory authorities, backport from 0.3.4.1-alpha):
  8858. - When directory authorities read a zero-byte bandwidth file, they
  8859. would previously log a warning with the contents of an
  8860. uninitialised buffer. They now log a warning about the empty file
  8861. instead. Fixes bug 26007; bugfix on 0.2.2.1-alpha.
  8862. o Major bugfixes (onion service, backport from 0.3.4.1-alpha):
  8863. - Correctly detect when onion services get disabled after HUP. Fixes
  8864. bug 25761; bugfix on 0.3.2.1.
  8865. o Minor features (sandbox, backport from 0.3.3.4-alpha):
  8866. - Explicitly permit the poll() system call when the Linux
  8867. seccomp2-based sandbox is enabled: apparently, some versions of
  8868. libc use poll() when calling getpwnam(). Closes ticket 25313.
  8869. o Minor feature (continuous integration, backport from 0.3.3.5-rc):
  8870. - Update the Travis CI configuration to use the stable Rust channel,
  8871. now that we have decided to require that. Closes ticket 25714.
  8872. o Minor features (continuous integration, backport from 0.3.4.1-alpha):
  8873. - Our .travis.yml configuration now includes support for testing the
  8874. results of "make distcheck". (It's not uncommon for "make check"
  8875. to pass but "make distcheck" to fail.) Closes ticket 25814.
  8876. - Our Travis CI configuration now integrates with the Coveralls
  8877. coverage analysis tool. Closes ticket 25818.
  8878. o Minor features (relay, diagnostic, backport from 0.3.4.3-alpha):
  8879. - Add several checks to detect whether Tor relays are uploading
  8880. their descriptors without specifying why they regenerated them.
  8881. Diagnostic for ticket 25686.
  8882. o Minor features (compilation, backport from 0.3.4.4-rc):
  8883. - When building Tor, prefer to use Python 3 over Python 2, and more
  8884. recent (contemplated) versions over older ones. Closes
  8885. ticket 26372.
  8886. o Minor features (geoip):
  8887. - Update geoip and geoip6 to the July 3 2018 Maxmind GeoLite2
  8888. Country database. Closes ticket 26674.
  8889. o Minor bugfixes (correctness, client, backport from 0.3.4.1-alpha):
  8890. - Upon receiving a malformed connected cell, stop processing the
  8891. cell immediately. Previously we would mark the connection for
  8892. close, but continue processing the cell as if the connection were
  8893. open. Fixes bug 26072; bugfix on 0.2.4.7-alpha.
  8894. o Minor bugfixes (Linux seccomp2 sandbox, backport from 0.3.4.1-alpha):
  8895. - Allow the nanosleep() system call, which glibc uses to implement
  8896. sleep() and usleep(). Fixes bug 24969; bugfix on 0.2.5.1-alpha.
  8897. o Minor bugfixes (testing, compatibility, backport from 0.3.4.4-rc):
  8898. - When running the hs_ntor_ref.py test, make sure only to pass
  8899. strings (rather than "bytes" objects) to the Python subprocess
  8900. module. Python 3 on Windows seems to require this. Fixes bug
  8901. 26535; bugfix on 0.3.1.1-alpha.
  8902. - When running the ntor_ref.py test, make sure only to pass strings
  8903. (rather than "bytes" objects) to the Python subprocess module.
  8904. Python 3 on Windows seems to require this. Fixes bug 26535; bugfix
  8905. on 0.2.5.5-alpha.
  8906. o Minor bugfixes (compatibility, openssl, backport from 0.3.4.2-alpha):
  8907. - Work around a change in OpenSSL 1.1.1 where return values that
  8908. would previously indicate "no password" now indicate an empty
  8909. password. Without this workaround, Tor instances running with
  8910. OpenSSL 1.1.1 would accept descriptors that other Tor instances
  8911. would reject. Fixes bug 26116; bugfix on 0.2.5.16.
  8912. o Minor bugfixes (documentation, backport from 0.3.3.5-rc):
  8913. - Document that the PerConnBW{Rate,Burst} options will fall back to
  8914. their corresponding consensus parameters only if those parameters
  8915. are set. Previously we had claimed that these values would always
  8916. be set in the consensus. Fixes bug 25296; bugfix on 0.2.2.7-alpha.
  8917. o Minor bugfixes (compilation, backport from 0.3.4.4-rc):
  8918. - Fix a compilation warning on some versions of GCC when building
  8919. code that calls routerinfo_get_my_routerinfo() twice, assuming
  8920. that the second call will succeed if the first one did. Fixes bug
  8921. 26269; bugfix on 0.2.8.2-alpha.
  8922. o Minor bugfixes (client, backport from 0.3.4.1-alpha):
  8923. - Don't consider Tor running as a client if the ControlPort is open,
  8924. but no actual client ports are open. Fixes bug 26062; bugfix
  8925. on 0.2.9.4-alpha.
  8926. o Minor bugfixes (hardening, backport from 0.3.4.2-alpha):
  8927. - Prevent a possible out-of-bounds smartlist read in
  8928. protover_compute_vote(). Fixes bug 26196; bugfix on 0.2.9.4-alpha.
  8929. o Minor bugfixes (C correctness, backport from 0.3.3.4-alpha):
  8930. - Fix a very unlikely (impossible, we believe) null pointer
  8931. dereference. Fixes bug 25629; bugfix on 0.2.9.15. Found by
  8932. Coverity; this is CID 1430932.
  8933. o Minor bugfixes (onion service, backport from 0.3.4.1-alpha):
  8934. - Fix a memory leak when a v3 onion service is configured and gets a
  8935. SIGHUP signal. Fixes bug 25901; bugfix on 0.3.2.1-alpha.
  8936. - When parsing the descriptor signature, look for the token plus an
  8937. extra white-space at the end. This is more correct but also will
  8938. allow us to support new fields that might start with "signature".
  8939. Fixes bug 26069; bugfix on 0.3.0.1-alpha.
  8940. o Minor bugfixes (relay, backport from 0.3.4.3-alpha):
  8941. - Relays now correctly block attempts to re-extend to the previous
  8942. relay by Ed25519 identity. Previously they would warn in this
  8943. case, but not actually reject the attempt. Fixes bug 26158; bugfix
  8944. on 0.3.0.1-alpha.
  8945. o Minor bugfixes (relay, crash, backport from 0.3.4.1-alpha):
  8946. - Avoid a crash when running with DirPort set but ORPort turned off.
  8947. Fixes a case of bug 23693; bugfix on 0.3.1.1-alpha.
  8948. o Minor bugfixes (compilation, backport from 0.3.4.2-alpha):
  8949. - Silence unused-const-variable warnings in zstd.h with some GCC
  8950. versions. Fixes bug 26272; bugfix on 0.3.1.1-alpha.
  8951. o Minor bugfixes (testing, backport from 0.3.3.4-alpha):
  8952. - Avoid intermittent test failures due to a test that had relied on
  8953. onion service introduction point creation finishing within 5
  8954. seconds of real clock time. Fixes bug 25450; bugfix
  8955. on 0.3.1.3-alpha.
  8956. o Minor bugfixes (compilation, backport from 0.3.3.4-alpha):
  8957. - Fix a C99 compliance issue in our configuration script that caused
  8958. compilation issues when compiling Tor with certain versions of
  8959. xtools. Fixes bug 25474; bugfix on 0.3.2.5-alpha.
  8960. o Minor bugfixes (memory, correctness, backport from 0.3.4.4-rc):
  8961. - Fix a number of small memory leaks identified by coverity. Fixes
  8962. bug 26467; bugfix on numerous Tor versions.
  8963. o Code simplification and refactoring (backport from 0.3.3.5-rc):
  8964. - Move the list of default directory authorities to its own file.
  8965. Closes ticket 24854. Patch by "beastr0".
  8966. Changes in version 0.2.9.16 - 2018-07-13
  8967. Tor 0.2.9.16 moves to a new bridge authority, meaning people running
  8968. bridge relays should upgrade. We also take this opportunity to backport
  8969. other minor fixes.
  8970. o Directory authority changes:
  8971. - The "Bifroest" bridge authority has been retired; the new bridge
  8972. authority is "Serge", and it is operated by George from the
  8973. TorBSD project. Closes ticket 26771.
  8974. o Directory authority changes (backport from 0.3.3.7):
  8975. - Add an IPv6 address for the "dannenberg" directory authority.
  8976. Closes ticket 26343.
  8977. o Major bugfixes (directory authorities, backport from 0.3.4.1-alpha):
  8978. - When directory authorities read a zero-byte bandwidth file, they
  8979. would previously log a warning with the contents of an
  8980. uninitialised buffer. They now log a warning about the empty file
  8981. instead. Fixes bug 26007; bugfix on 0.2.2.1-alpha.
  8982. o Minor features (sandbox, backport from 0.3.3.4-alpha):
  8983. - Explicitly permit the poll() system call when the Linux
  8984. seccomp2-based sandbox is enabled: apparently, some versions of
  8985. libc use poll() when calling getpwnam(). Closes ticket 25313.
  8986. o Minor features (continuous integration, backport from 0.3.4.1-alpha):
  8987. - Our .travis.yml configuration now includes support for testing the
  8988. results of "make distcheck". (It's not uncommon for "make check"
  8989. to pass but "make distcheck" to fail.) Closes ticket 25814.
  8990. - Our Travis CI configuration now integrates with the Coveralls
  8991. coverage analysis tool. Closes ticket 25818.
  8992. o Minor features (compilation, backport from 0.3.4.4-rc):
  8993. - When building Tor, prefer to use Python 3 over Python 2, and more
  8994. recent (contemplated) versions over older ones. Closes
  8995. ticket 26372.
  8996. o Minor features (geoip):
  8997. - Update geoip and geoip6 to the July 3 2018 Maxmind GeoLite2
  8998. Country database. Closes ticket 26674.
  8999. o Minor bugfixes (correctness, client, backport from 0.3.4.1-alpha):
  9000. - Upon receiving a malformed connected cell, stop processing the
  9001. cell immediately. Previously we would mark the connection for
  9002. close, but continue processing the cell as if the connection were
  9003. open. Fixes bug 26072; bugfix on 0.2.4.7-alpha.
  9004. o Minor bugfixes (Linux seccomp2 sandbox, backport from 0.3.4.1-alpha):
  9005. - Allow the nanosleep() system call, which glibc uses to implement
  9006. sleep() and usleep(). Fixes bug 24969; bugfix on 0.2.5.1-alpha.
  9007. o Minor bugfixes (testing, compatibility, backport from 0.3.4.4-rc):
  9008. - When running the ntor_ref.py test, make sure only to pass strings
  9009. (rather than "bytes" objects) to the Python subprocess module.
  9010. Python 3 on Windows seems to require this. Fixes bug 26535; bugfix
  9011. on 0.2.5.5-alpha.
  9012. o Minor bugfixes (compatibility, openssl, backport from 0.3.4.2-alpha):
  9013. - Work around a change in OpenSSL 1.1.1 where return values that
  9014. would previously indicate "no password" now indicate an empty
  9015. password. Without this workaround, Tor instances running with
  9016. OpenSSL 1.1.1 would accept descriptors that other Tor instances
  9017. would reject. Fixes bug 26116; bugfix on 0.2.5.16.
  9018. o Minor bugfixes (compilation, backport from 0.3.4.4-rc):
  9019. - Fix a compilation warning on some versions of GCC when building
  9020. code that calls routerinfo_get_my_routerinfo() twice, assuming
  9021. that the second call will succeed if the first one did. Fixes bug
  9022. 26269; bugfix on 0.2.8.2-alpha.
  9023. o Minor bugfixes (client, backport from 0.3.4.1-alpha):
  9024. - Don't consider Tor running as a client if the ControlPort is open,
  9025. but no actual client ports are open. Fixes bug 26062; bugfix
  9026. on 0.2.9.4-alpha.
  9027. o Minor bugfixes (hardening, backport from 0.3.4.2-alpha):
  9028. - Prevent a possible out-of-bounds smartlist read in
  9029. protover_compute_vote(). Fixes bug 26196; bugfix on 0.2.9.4-alpha.
  9030. o Minor bugfixes (C correctness, backport from 0.3.3.4-alpha):
  9031. - Fix a very unlikely (impossible, we believe) null pointer
  9032. dereference. Fixes bug 25629; bugfix on 0.2.9.15. Found by
  9033. Coverity; this is CID 1430932.
  9034. o Minor bugfixes (memory, correctness, backport from 0.3.4.4-rc):
  9035. - Fix a number of small memory leaks identified by coverity. Fixes
  9036. bug 26467; bugfix on numerous Tor versions.
  9037. o Code simplification and refactoring (backport from 0.3.3.5-rc):
  9038. - Move the list of default directory authorities to its own file.
  9039. Closes ticket 24854. Patch by "beastr0".
  9040. Changes in version 0.3.3.8 - 2018-07-09
  9041. Tor 0.3.3.8 backports several changes from the 0.3.4.x series, including
  9042. fixes for a memory leak affecting directory authorities.
  9043. o Major bugfixes (directory authority, backport from 0.3.4.3-alpha):
  9044. - Stop leaking memory on directory authorities when planning to
  9045. vote. This bug was crashing authorities by exhausting their
  9046. memory. Fixes bug 26435; bugfix on 0.3.3.6.
  9047. o Major bugfixes (rust, testing, backport from 0.3.4.3-alpha):
  9048. - Make sure that failing tests in Rust will actually cause the build
  9049. to fail: previously, they were ignored. Fixes bug 26258; bugfix
  9050. on 0.3.3.4-alpha.
  9051. o Minor features (compilation, backport from 0.3.4.4-rc):
  9052. - When building Tor, prefer to use Python 3 over Python 2, and more
  9053. recent (contemplated) versions over older ones. Closes
  9054. ticket 26372.
  9055. o Minor features (geoip):
  9056. - Update geoip and geoip6 to the July 3 2018 Maxmind GeoLite2
  9057. Country database. Closes ticket 26674.
  9058. o Minor features (relay, diagnostic, backport from 0.3.4.3-alpha):
  9059. - Add several checks to detect whether Tor relays are uploading
  9060. their descriptors without specifying why they regenerated them.
  9061. Diagnostic for ticket 25686.
  9062. o Minor bugfixes (circuit path selection, backport from 0.3.4.1-alpha):
  9063. - Don't count path selection failures as circuit build failures.
  9064. This change should eliminate cases where Tor blames its guard or
  9065. the network for situations like insufficient microdescriptors
  9066. and/or overly restrictive torrc settings. Fixes bug 25705; bugfix
  9067. on 0.3.3.1-alpha.
  9068. o Minor bugfixes (compilation, backport from 0.3.4.4-rc):
  9069. - Fix a compilation warning on some versions of GCC when building
  9070. code that calls routerinfo_get_my_routerinfo() twice, assuming
  9071. that the second call will succeed if the first one did. Fixes bug
  9072. 26269; bugfix on 0.2.8.2-alpha.
  9073. o Minor bugfixes (control port, backport from 0.3.4.4-rc):
  9074. - Handle the HSADDRESS= argument to the HSPOST command properly.
  9075. (Previously, this argument was misparsed and thus ignored.) Fixes
  9076. bug 26523; bugfix on 0.3.3.1-alpha. Patch by "akwizgran".
  9077. o Minor bugfixes (memory, correctness, backport from 0.3.4.4-rc):
  9078. - Fix a number of small memory leaks identified by coverity. Fixes
  9079. bug 26467; bugfix on numerous Tor versions.
  9080. o Minor bugfixes (relay, backport from 0.3.4.3-alpha):
  9081. - Relays now correctly block attempts to re-extend to the previous
  9082. relay by Ed25519 identity. Previously they would warn in this
  9083. case, but not actually reject the attempt. Fixes bug 26158; bugfix
  9084. on 0.3.0.1-alpha.
  9085. o Minor bugfixes (restart-in-process, backport from 0.3.4.1-alpha):
  9086. - When shutting down, Tor now clears all the flags in the control.c
  9087. module. This should prevent a bug where authentication cookies are
  9088. not generated on restart. Fixes bug 25512; bugfix on 0.3.3.1-alpha.
  9089. o Minor bugfixes (testing, compatibility, backport from 0.3.4.4-rc):
  9090. - When running the hs_ntor_ref.py test, make sure only to pass
  9091. strings (rather than "bytes" objects) to the Python subprocess
  9092. module. Python 3 on Windows seems to require this. Fixes bug
  9093. 26535; bugfix on 0.3.1.1-alpha.
  9094. - When running the ntor_ref.py test, make sure only to pass strings
  9095. (rather than "bytes" objects) to the Python subprocess module.
  9096. Python 3 on Windows seems to require this. Fixes bug 26535; bugfix
  9097. on 0.2.5.5-alpha.
  9098. Changes in version 0.3.3.7 - 2018-06-12
  9099. Tor 0.3.3.7 backports several changes from the 0.3.4.x series, including
  9100. fixes for bugs affecting compatibility and stability.
  9101. o Directory authority changes:
  9102. - Add an IPv6 address for the "dannenberg" directory authority.
  9103. Closes ticket 26343.
  9104. o Minor features (geoip):
  9105. - Update geoip and geoip6 to the June 7 2018 Maxmind GeoLite2
  9106. Country database. Closes ticket 26351.
  9107. o Minor bugfixes (compatibility, openssl, backport from 0.3.4.2-alpha):
  9108. - Work around a change in OpenSSL 1.1.1 where return values that
  9109. would previously indicate "no password" now indicate an empty
  9110. password. Without this workaround, Tor instances running with
  9111. OpenSSL 1.1.1 would accept descriptors that other Tor instances
  9112. would reject. Fixes bug 26116; bugfix on 0.2.5.16.
  9113. o Minor bugfixes (compilation, backport from 0.3.4.2-alpha):
  9114. - Silence unused-const-variable warnings in zstd.h with some GCC
  9115. versions. Fixes bug 26272; bugfix on 0.3.1.1-alpha.
  9116. o Minor bugfixes (controller, backport from 0.3.4.2-alpha):
  9117. - Improve accuracy of the BUILDTIMEOUT_SET control port event's
  9118. TIMEOUT_RATE and CLOSE_RATE fields. (We were previously
  9119. miscounting the total number of circuits for these field values.)
  9120. Fixes bug 26121; bugfix on 0.3.3.1-alpha.
  9121. o Minor bugfixes (hardening, backport from 0.3.4.2-alpha):
  9122. - Prevent a possible out-of-bounds smartlist read in
  9123. protover_compute_vote(). Fixes bug 26196; bugfix on 0.2.9.4-alpha.
  9124. o Minor bugfixes (path selection, backport from 0.3.4.1-alpha):
  9125. - Only select relays when they have the descriptors we prefer to use
  9126. for them. This change fixes a bug where we could select a relay
  9127. because it had _some_ descriptor, but reject it later with a
  9128. nonfatal assertion error because it didn't have the exact one we
  9129. wanted. Fixes bugs 25691 and 25692; bugfix on 0.3.3.4-alpha.
  9130. Changes in version 0.3.3.6 - 2018-05-22
  9131. Tor 0.3.3.6 is the first stable release in the 0.3.3 series. It
  9132. backports several important fixes from the 0.3.4.1-alpha.
  9133. The Tor 0.3.3 series includes controller support and other
  9134. improvements for v3 onion services, official support for embedding Tor
  9135. within other applications, and our first non-trivial module written in
  9136. the Rust programming language. (Rust is still not enabled by default
  9137. when building Tor.) And as usual, there are numerous other smaller
  9138. bugfixes, features, and improvements.
  9139. Below are the changes since 0.3.2.10. For a list of only the changes
  9140. since 0.3.3.5-rc, see the ChangeLog file.
  9141. o New system requirements:
  9142. - When built with Rust, Tor now depends on version 0.2.39 of the
  9143. libc crate. Closes tickets 25310 and 25664.
  9144. o Major features (embedding):
  9145. - There is now a documented stable API for programs that need to
  9146. embed Tor. See tor_api.h for full documentation and known bugs.
  9147. Closes ticket 23684.
  9148. - Tor now has support for restarting in the same process.
  9149. Controllers that run Tor using the "tor_api.h" interface can now
  9150. restart Tor after Tor has exited. This support is incomplete,
  9151. however: we fixed crash bugs that prevented it from working at
  9152. all, but many bugs probably remain, including a possibility of
  9153. security issues. Implements ticket 24581.
  9154. o Major features (IPv6, directory documents):
  9155. - Add consensus method 27, which adds IPv6 ORPorts to the microdesc
  9156. consensus. This information makes it easier for IPv6 clients to
  9157. bootstrap and choose reachable entry guards. Implements
  9158. ticket 23826.
  9159. - Add consensus method 28, which removes IPv6 ORPorts from
  9160. microdescriptors. Now that the consensus contains IPv6 ORPorts,
  9161. they are redundant in microdescs. This change will be used by Tor
  9162. clients on 0.2.8.x and later. (That is to say, with all Tor
  9163. clients that have IPv6 bootstrap and guard support.) Implements
  9164. ticket 23828.
  9165. - Expand the documentation for AuthDirHasIPv6Connectivity when it is
  9166. set by different numbers of authorities. Fixes 23870
  9167. on 0.2.4.1-alpha.
  9168. o Major features (onion service v3, control port):
  9169. - The control port now supports commands and events for v3 onion
  9170. services. It is now possible to create ephemeral v3 services using
  9171. ADD_ONION. Additionally, several events (HS_DESC, HS_DESC_CONTENT,
  9172. CIRC and CIRC_MINOR) and commands (GETINFO, HSPOST, ADD_ONION and
  9173. DEL_ONION) have been extended to support v3 onion services. Closes
  9174. ticket 20699; implements proposal 284.
  9175. o Major features (onion services):
  9176. - Provide torrc options to pin the second and third hops of onion
  9177. service circuits to a list of nodes. The option HSLayer2Guards
  9178. pins the second hop, and the option HSLayer3Guards pins the third
  9179. hop. These options are for use in conjunction with experiments
  9180. with "vanguards" for preventing guard enumeration attacks. Closes
  9181. ticket 13837.
  9182. - When v3 onion service clients send introduce cells, they now
  9183. include the IPv6 address of the rendezvous point, if it has one.
  9184. Current v3 onion services running 0.3.2 ignore IPv6 addresses, but
  9185. in future Tor versions, IPv6-only v3 single onion services will be
  9186. able to use IPv6 addresses to connect directly to the rendezvous
  9187. point. Closes ticket 23577. Patch by Neel Chauhan.
  9188. o Major features (relay):
  9189. - Implement an option, ReducedExitPolicy, to allow an Tor exit relay
  9190. operator to use a more reasonable ("reduced") exit policy, rather
  9191. than the default one. If you want to run an exit node without
  9192. thinking too hard about which ports to allow, this one is for you.
  9193. Closes ticket 13605. Patch from Neel Chauhan.
  9194. o Major features (rust, portability, experimental):
  9195. - Tor now ships with an optional implementation of one of its
  9196. smaller modules (protover.c) in the Rust programming language. To
  9197. try it out, install a Rust build environment, and configure Tor
  9198. with "--enable-rust --enable-cargo-online-mode". This should not
  9199. cause any user-visible changes, but should help us gain more
  9200. experience with Rust, and plan future Rust integration work.
  9201. Implementation by Chelsea Komlo. Closes ticket 22840.
  9202. o Major bugfixes (directory authorities, security, backport from 0.3.4.1-alpha):
  9203. - When directory authorities read a zero-byte bandwidth file, they
  9204. would previously log a warning with the contents of an
  9205. uninitialised buffer. They now log a warning about the empty file
  9206. instead. Fixes bug 26007; bugfix on 0.2.2.1-alpha.
  9207. o Major bugfixes (security, directory authority, denial-of-service):
  9208. - Fix a bug that could have allowed an attacker to force a directory
  9209. authority to use up all its RAM by passing it a maliciously
  9210. crafted protocol versions string. Fixes bug 25517; bugfix on
  9211. 0.2.9.4-alpha. This issue is also tracked as TROVE-2018-005.
  9212. o Major bugfixes (crash, backport from 0.3.4.1-alpha):
  9213. - Avoid a rare assertion failure in the circuit build timeout code
  9214. if we fail to allow any circuits to actually complete. Fixes bug
  9215. 25733; bugfix on 0.2.2.2-alpha.
  9216. o Major bugfixes (netflow padding):
  9217. - Stop adding unneeded channel padding right after we finish
  9218. flushing to a connection that has been trying to flush for many
  9219. seconds. Instead, treat all partial or complete flushes as
  9220. activity on the channel, which will defer the time until we need
  9221. to add padding. This fix should resolve confusing and scary log
  9222. messages like "Channel padding timeout scheduled 221453ms in the
  9223. past." Fixes bug 22212; bugfix on 0.3.1.1-alpha.
  9224. o Major bugfixes (networking):
  9225. - Tor will no longer reject IPv6 address strings from Tor Browser
  9226. when they are passed as hostnames in SOCKS5 requests. Fixes bug
  9227. 25036, bugfix on Tor 0.3.1.2.
  9228. o Major bugfixes (onion service, backport from 0.3.4.1-alpha):
  9229. - Correctly detect when onion services get disabled after HUP. Fixes
  9230. bug 25761; bugfix on 0.3.2.1.
  9231. o Major bugfixes (performance, load balancing):
  9232. - Directory authorities no longer vote in favor of the Guard flag
  9233. for relays without directory support. Starting in Tor
  9234. 0.3.0.1-alpha, clients have been avoiding using such relays in the
  9235. Guard position, leading to increasingly broken load balancing for
  9236. the 5%-or-so of Guards that don't advertise directory support.
  9237. Fixes bug 22310; bugfix on 0.3.0.6.
  9238. o Major bugfixes (relay):
  9239. - If we have failed to connect to a relay and received a connection
  9240. refused, timeout, or similar error (at the TCP level), do not try
  9241. that same address/port again for 60 seconds after the failure has
  9242. occurred. Fixes bug 24767; bugfix on 0.0.6.
  9243. o Major bugfixes (relay, denial of service, backport from 0.3.4.1-alpha):
  9244. - Impose a limit on circuit cell queue size. The limit can be
  9245. controlled by a consensus parameter. Fixes bug 25226; bugfix
  9246. on 0.2.4.14-alpha.
  9247. o Minor features (cleanup):
  9248. - Tor now deletes the CookieAuthFile and ExtORPortCookieAuthFile
  9249. when it stops. Closes ticket 23271.
  9250. o Minor features (compatibility, backport from 0.3.4.1-alpha):
  9251. - Avoid some compilation warnings with recent versions of LibreSSL.
  9252. Closes ticket 26006.
  9253. o Minor features (config options):
  9254. - Change the way the default value for MaxMemInQueues is calculated.
  9255. We now use 40% of the hardware RAM if the system has 8 GB RAM or
  9256. more. Otherwise we use the former value of 75%. Closes
  9257. ticket 24782.
  9258. o Minor features (continuous integration):
  9259. - Update the Travis CI configuration to use the stable Rust channel,
  9260. now that we have decided to require that. Closes ticket 25714.
  9261. o Minor features (continuous integration, backport from 0.3.4.1-alpha):
  9262. - Our .travis.yml configuration now includes support for testing the
  9263. results of "make distcheck". (It's not uncommon for "make check"
  9264. to pass but "make distcheck" to fail.) Closes ticket 25814.
  9265. - Our Travis CI configuration now integrates with the Coveralls
  9266. coverage analysis tool. Closes ticket 25818.
  9267. o Minor features (defensive programming):
  9268. - Most of the functions in Tor that free objects have been replaced
  9269. with macros that free the objects and set the corresponding
  9270. pointers to NULL. This change should help prevent a large class of
  9271. dangling pointer bugs. Closes ticket 24337.
  9272. - Where possible, the tor_free() macro now only evaluates its input
  9273. once. Part of ticket 24337.
  9274. - Check that microdesc ed25519 ids are non-zero in
  9275. node_get_ed25519_id() before returning them. Implements ticket
  9276. 24001, patch by "aruna1234".
  9277. o Minor features (directory authority):
  9278. - When directory authorities are unable to add signatures to a
  9279. pending consensus, log the reason why. Closes ticket 24849.
  9280. o Minor features (embedding):
  9281. - Tor can now start with a preauthenticated control connection
  9282. created by the process that launched it. This feature is meant for
  9283. use by programs that want to launch and manage a Tor process
  9284. without allowing other programs to manage it as well. For more
  9285. information, see the __OwningControllerFD option documented in
  9286. control-spec.txt. Closes ticket 23900.
  9287. - On most errors that would cause Tor to exit, it now tries to
  9288. return from the tor_main() function, rather than calling the
  9289. system exit() function. Most users won't notice a difference here,
  9290. but it should be significant for programs that run Tor inside a
  9291. separate thread: they should now be able to survive Tor's exit
  9292. conditions rather than having Tor shut down the entire process.
  9293. Closes ticket 23848.
  9294. - Applications that want to embed Tor can now tell Tor not to
  9295. register any of its own POSIX signal handlers, using the
  9296. __DisableSignalHandlers option. Closes ticket 24588.
  9297. o Minor features (fallback directory list):
  9298. - Avoid selecting fallbacks that change their IP addresses too
  9299. often. Select more fallbacks by ignoring the Guard flag, and
  9300. allowing lower cutoffs for the Running and V2Dir flags. Also allow
  9301. a lower bandwidth, and a higher number of fallbacks per operator
  9302. (5% of the list). Implements ticket 24785.
  9303. - Update the fallback whitelist and blacklist based on opt-ins and
  9304. relay changes. Closes tickets 22321, 24678, 22527, 24135,
  9305. and 24695.
  9306. o Minor features (fallback directory mirror configuration):
  9307. - Add a nickname to each fallback in a C comment. This makes it
  9308. easier for operators to find their relays, and allows stem to use
  9309. nicknames to identify fallbacks. Implements ticket 24600.
  9310. - Add a type and version header to the fallback directory mirror
  9311. file. Also add a delimiter to the end of each fallback entry. This
  9312. helps external parsers like stem and Relay Search. Implements
  9313. ticket 24725.
  9314. - Add an extrainfo cache flag for each fallback in a C comment. This
  9315. allows stem to use fallbacks to fetch extra-info documents, rather
  9316. than using authorities. Implements ticket 22759.
  9317. - Add the generateFallbackDirLine.py script for automatically
  9318. generating fallback directory mirror lines from relay fingerprints.
  9319. No more typos! Add the lookupFallbackDirContact.py script for
  9320. automatically looking up operator contact info from relay
  9321. fingerprints. Implements ticket 24706, patch by teor and atagar.
  9322. - Reject any fallback directory mirror that serves an expired
  9323. consensus. Implements ticket 20942, patch by "minik".
  9324. - Remove commas and equals signs from external string inputs to the
  9325. fallback list. This avoids format confusion attacks. Implements
  9326. ticket 24726.
  9327. - Remove the "weight=10" line from fallback directory mirror
  9328. entries. Ticket 24681 will maintain the current fallback weights
  9329. by changing Tor's default fallback weight to 10. Implements
  9330. ticket 24679.
  9331. - Stop logging excessive information about fallback netblocks.
  9332. Implements ticket 24791.
  9333. o Minor features (forward-compatibility):
  9334. - If a relay supports some link authentication protocol that we do
  9335. not recognize, then include that relay's ed25519 key when telling
  9336. other relays to extend to it. Previously, we treated future
  9337. versions as if they were too old to support ed25519 link
  9338. authentication. Closes ticket 20895.
  9339. o Minor features (geoip):
  9340. - Update geoip and geoip6 to the May 1 2018 Maxmind GeoLite2 Country
  9341. database. Closes ticket 26104.
  9342. o Minor features (heartbeat):
  9343. - Add onion service information to our heartbeat logs, displaying
  9344. stats about the activity of configured onion services. Closes
  9345. ticket 24896.
  9346. o Minor features (instrumentation, development):
  9347. - Add the MainloopStats option to allow developers to get
  9348. instrumentation information from the main event loop via the
  9349. heartbeat messages. We hope to use this to improve Tor's behavior
  9350. when it's trying to sleep. Closes ticket 24605.
  9351. o Minor features (IPv6):
  9352. - Make IPv6-only clients wait for microdescs for relays, even if we
  9353. were previously using descriptors (or were using them as a bridge)
  9354. and have a cached descriptor for them. Implements ticket 23827.
  9355. - When a consensus has IPv6 ORPorts, make IPv6-only clients use
  9356. them, rather than waiting to download microdescriptors. Implements
  9357. ticket 23827.
  9358. o Minor features (log messages):
  9359. - Improve log message in the out-of-memory handler to include
  9360. information about memory usage from the different compression
  9361. backends. Closes ticket 25372.
  9362. - Improve a warning message that happens when we fail to re-parse an
  9363. old router because of an expired certificate. Closes ticket 20020.
  9364. - Make the log more quantitative when we hit MaxMemInQueues
  9365. threshold exposing some values. Closes ticket 24501.
  9366. o Minor features (logging):
  9367. - Clarify the log messages produced when getrandom() or a related
  9368. entropy-generation mechanism gives an error. Closes ticket 25120.
  9369. - Added support for the Android logging subsystem. Closes
  9370. ticket 24362.
  9371. o Minor features (performance):
  9372. - Support predictive circuit building for onion service circuits
  9373. with multiple layers of guards. Closes ticket 23101.
  9374. - Use stdatomic.h where available, rather than mutexes, to implement
  9375. atomic_counter_t. Closes ticket 23953.
  9376. o Minor features (performance, 32-bit):
  9377. - Improve performance on 32-bit systems by avoiding 64-bit division
  9378. when calculating the timestamp in milliseconds for channel padding
  9379. computations. Implements ticket 24613.
  9380. - Improve performance on 32-bit systems by avoiding 64-bit division
  9381. when timestamping cells and buffer chunks for OOM calculations.
  9382. Implements ticket 24374.
  9383. o Minor features (performance, OSX, iOS):
  9384. - Use the mach_approximate_time() function (when available) to
  9385. implement coarse monotonic time. Having a coarse time function
  9386. should avoid a large number of system calls, and improve
  9387. performance slightly, especially under load. Closes ticket 24427.
  9388. o Minor features (performance, windows):
  9389. - Improve performance on Windows Vista and Windows 7 by adjusting
  9390. TCP send window size according to the recommendation from
  9391. SIO_IDEAL_SEND_BACKLOG_QUERY. Closes ticket 22798. Patch
  9392. from Vort.
  9393. o Minor features (sandbox):
  9394. - Explicitly permit the poll() system call when the Linux
  9395. seccomp2-based sandbox is enabled: apparently, some versions of
  9396. libc use poll() when calling getpwnam(). Closes ticket 25313.
  9397. o Minor features (storage, configuration):
  9398. - Users can store cached directory documents somewhere other than
  9399. the DataDirectory by using the CacheDirectory option. Similarly,
  9400. the storage location for relay's keys can be overridden with the
  9401. KeyDirectory option. Closes ticket 22703.
  9402. o Minor features (testing):
  9403. - Add a "make test-rust" target to run the rust tests only. Closes
  9404. ticket 25071.
  9405. o Minor features (testing, debugging, embedding):
  9406. - For development purposes, Tor now has a mode in which it runs for
  9407. a few seconds, then stops, and starts again without exiting the
  9408. process. This mode is meant to help us debug various issues with
  9409. ticket 23847. To use this feature, compile with
  9410. --enable-restart-debugging, and set the TOR_DEBUG_RESTART
  9411. environment variable. This is expected to crash a lot, and is
  9412. really meant for developers only. It will likely be removed in a
  9413. future release. Implements ticket 24583.
  9414. o Minor bugfixes (build, rust):
  9415. - Fix output of autoconf checks to display success messages for Rust
  9416. dependencies and a suitable rustc compiler version. Fixes bug
  9417. 24612; bugfix on 0.3.1.3-alpha.
  9418. - Don't pass the --quiet option to cargo: it seems to suppress some
  9419. errors, which is not what we want to do when building. Fixes bug
  9420. 24518; bugfix on 0.3.1.7.
  9421. - Build correctly when building from outside Tor's source tree with
  9422. the TOR_RUST_DEPENDENCIES option set. Fixes bug 22768; bugfix
  9423. on 0.3.1.7.
  9424. o Minor bugfixes (C correctness):
  9425. - Fix a very unlikely (impossible, we believe) null pointer
  9426. dereference. Fixes bug 25629; bugfix on 0.2.9.15. Found by
  9427. Coverity; this is CID 1430932.
  9428. o Minor bugfixes (channel, client):
  9429. - Better identify client connection when reporting to the geoip
  9430. client cache. Fixes bug 24904; bugfix on 0.3.1.7.
  9431. o Minor bugfixes (circuit, cannibalization):
  9432. - Don't cannibalize preemptively-built circuits if we no longer
  9433. recognize their first hop. This situation can happen if our Guard
  9434. relay went off the consensus after the circuit was created. Fixes
  9435. bug 24469; bugfix on 0.0.6.
  9436. o Minor bugfixes (client, backport from 0.3.4.1-alpha):
  9437. - Don't consider Tor running as a client if the ControlPort is open,
  9438. but no actual client ports are open. Fixes bug 26062; bugfix
  9439. on 0.2.9.4-alpha.
  9440. o Minor bugfixes (compilation):
  9441. - Fix a C99 compliance issue in our configuration script that caused
  9442. compilation issues when compiling Tor with certain versions of
  9443. xtools. Fixes bug 25474; bugfix on 0.3.2.5-alpha.
  9444. o Minor bugfixes (controller):
  9445. - Restore the correct operation of the RESOLVE command, which had
  9446. been broken since we added the ability to enable/disable DNS on
  9447. specific listener ports. Fixes bug 25617; bugfix on 0.2.9.3-alpha.
  9448. - Avoid a (nonfatal) assertion failure when extending a one-hop
  9449. circuit from the controller to become a multihop circuit. Fixes
  9450. bug 24903; bugfix on 0.2.5.2-alpha.
  9451. o Minor bugfixes (correctness):
  9452. - Remove a nonworking, unnecessary check to see whether a circuit
  9453. hop's identity digest was set when the circuit failed. Fixes bug
  9454. 24927; bugfix on 0.2.4.4-alpha.
  9455. o Minor bugfixes (correctness, client, backport from 0.3.4.1-alpha):
  9456. - Upon receiving a malformed connected cell, stop processing the
  9457. cell immediately. Previously we would mark the connection for
  9458. close, but continue processing the cell as if the connection were
  9459. open. Fixes bug 26072; bugfix on 0.2.4.7-alpha.
  9460. o Minor bugfixes (directory authorities, IPv6):
  9461. - When creating a routerstatus (vote) from a routerinfo (descriptor),
  9462. set the IPv6 address to the unspecified IPv6 address, and
  9463. explicitly initialize the port to zero. Fixes bug 24488; bugfix
  9464. on 0.2.4.1-alpha.
  9465. o Minor bugfixes (documentation):
  9466. - Document that the PerConnBW{Rate,Burst} options will fall back to
  9467. their corresponding consensus parameters only if those parameters
  9468. are set. Previously we had claimed that these values would always
  9469. be set in the consensus. Fixes bug 25296; bugfix on 0.2.2.7-alpha.
  9470. o Minor bugfixes (documentation, backport from 0.3.4.1-alpha):
  9471. - Stop saying in the manual that clients cache ipv4 dns answers from
  9472. exit relays. We haven't used them since 0.2.6.3-alpha, and in
  9473. ticket 24050 we stopped even caching them as of 0.3.2.6-alpha, but
  9474. we forgot to say so in the man page. Fixes bug 26052; bugfix
  9475. on 0.3.2.6-alpha.
  9476. o Minor bugfixes (exit relay DNS retries):
  9477. - Re-attempt timed-out DNS queries 3 times before failure, since our
  9478. timeout is 5 seconds for them, but clients wait 10-15. Also allow
  9479. slightly more timeouts per resolver when an exit has multiple
  9480. resolvers configured. Fixes bug 21394; bugfix on 0.3.1.9.
  9481. o Minor bugfixes (fallback directory mirrors):
  9482. - Make updateFallbackDirs.py search harder for python. (Some OSs
  9483. don't put it in /usr/bin.) Fixes bug 24708; bugfix
  9484. on 0.2.8.1-alpha.
  9485. o Minor bugfixes (hibernation, bandwidth accounting, shutdown):
  9486. - When hibernating, close connections normally and allow them to
  9487. flush. Fixes bug 23571; bugfix on 0.2.4.7-alpha. Also fixes
  9488. bug 7267.
  9489. - Do not attempt to launch self-reachability tests when entering
  9490. hibernation. Fixes a case of bug 12062; bugfix on 0.0.9pre5.
  9491. - Resolve several bugs related to descriptor fetching on bridge
  9492. clients with bandwidth accounting enabled. (This combination is
  9493. not recommended!) Fixes a case of bug 12062; bugfix
  9494. on 0.2.0.3-alpha.
  9495. - When hibernating, do not attempt to launch DNS checks. Fixes a
  9496. case of bug 12062; bugfix on 0.1.2.2-alpha.
  9497. - When hibernating, do not try to upload or download descriptors.
  9498. Fixes a case of bug 12062; bugfix on 0.0.9pre5.
  9499. o Minor bugfixes (IPv6, bridges):
  9500. - Tor now always sets IPv6 preferences for bridges. Fixes bug 24573;
  9501. bugfix on 0.2.8.2-alpha.
  9502. - Tor now sets IPv6 address in the routerstatus as well as in the
  9503. router descriptors when updating addresses for a bridge. Closes
  9504. ticket 24572; bugfix on 0.2.4.5-alpha. Patch by "ffmancera".
  9505. o Minor bugfixes (Linux seccomp2 sandbox):
  9506. - When running with the sandbox enabled, reload configuration files
  9507. correctly even when %include was used. Previously we would crash.
  9508. Fixes bug 22605; bugfix on 0.3.1. Patch from Daniel Pinto.
  9509. o Minor bugfixes (Linux seccomp2 sandbox, backport from 0.3.4.1-alpha):
  9510. - Allow the nanosleep() system call, which glibc uses to implement
  9511. sleep() and usleep(). Fixes bug 24969; bugfix on 0.2.5.1-alpha.
  9512. o Minor bugfixes (logging):
  9513. - Fix a (mostly harmless) race condition when invoking
  9514. LOG_PROTOCOL_WARN message from a subthread while the torrc options
  9515. are changing. Fixes bug 23954; bugfix on 0.1.1.9-alpha.
  9516. o Minor bugfixes (man page, SocksPort):
  9517. - Remove dead code from the old "SocksSocket" option, and rename
  9518. SocksSocketsGroupWritable to UnixSocksGroupWritable. The old
  9519. option still works, but is deprecated. Fixes bug 24343; bugfix
  9520. on 0.2.6.3.
  9521. o Minor bugfixes (memory leaks):
  9522. - Avoid possible at-exit memory leaks related to use of Libevent's
  9523. event_base_once() function. (This function tends to leak memory if
  9524. the event_base is closed before the event fires.) Fixes bug 24584;
  9525. bugfix on 0.2.8.1-alpha.
  9526. - Fix a harmless memory leak in tor-resolve. Fixes bug 24582; bugfix
  9527. on 0.2.1.1-alpha.
  9528. o Minor bugfixes (network IPv6 test):
  9529. - Tor's test scripts now check if "ping -6 ::1" works when the user
  9530. runs "make test-network-all". Fixes bug 24677; bugfix on
  9531. 0.2.9.3-alpha. Patch by "ffmancera".
  9532. o Minor bugfixes (networking):
  9533. - string_is_valid_hostname() will not consider IP strings to be
  9534. valid hostnames. Fixes bug 25055; bugfix on Tor 0.2.5.5.
  9535. o Minor bugfixes (onion service v3):
  9536. - Avoid an assertion failure when the next onion service descriptor
  9537. rotation type is out of sync with the consensus's valid-after
  9538. time. Instead, log a warning message with extra information, so we
  9539. can better hunt down the cause of this assertion. Fixes bug 25306;
  9540. bugfix on 0.3.2.1-alpha.
  9541. o Minor bugfixes (onion service, backport from 0.3.4.1-alpha):
  9542. - Fix a memory leak when a v3 onion service is configured and gets a
  9543. SIGHUP signal. Fixes bug 25901; bugfix on 0.3.2.1-alpha.
  9544. - When parsing the descriptor signature, look for the token plus an
  9545. extra white-space at the end. This is more correct but also will
  9546. allow us to support new fields that might start with "signature".
  9547. Fixes bug 26069; bugfix on 0.3.0.1-alpha.
  9548. o Minor bugfixes (onion services):
  9549. - If we are configured to offer a single onion service, don't log
  9550. long-term established one hop rendezvous points in the heartbeat.
  9551. Fixes bug 25116; bugfix on 0.2.9.6-rc.
  9552. o Minor bugfixes (performance):
  9553. - Reduce the number of circuits that will be opened at once during
  9554. the circuit build timeout phase. This is done by increasing the
  9555. idle timeout to 3 minutes, and lowering the maximum number of
  9556. concurrent learning circuits to 10. Fixes bug 24769; bugfix
  9557. on 0.3.1.1-alpha.
  9558. - Avoid calling protocol_list_supports_protocol() from inside tight
  9559. loops when running with cached routerinfo_t objects. Instead,
  9560. summarize the relevant protocols as flags in the routerinfo_t, as
  9561. we do for routerstatus_t objects. This change simplifies our code
  9562. a little, and saves a large amount of short-term memory allocation
  9563. operations. Fixes bug 25008; bugfix on 0.2.9.4-alpha.
  9564. o Minor bugfixes (performance, timeouts):
  9565. - Consider circuits for timeout as soon as they complete a hop. This
  9566. is more accurate than applying the timeout in
  9567. circuit_expire_building() because that function is only called
  9568. once per second, which is now too slow for typical timeouts on the
  9569. current network. Fixes bug 23114; bugfix on 0.2.2.2-alpha.
  9570. - Use onion service circuits (and other circuits longer than 3 hops)
  9571. to calculate a circuit build timeout. Previously, Tor only
  9572. calculated its build timeout based on circuits that planned to be
  9573. exactly 3 hops long. With this change, we include measurements
  9574. from all circuits at the point where they complete their third
  9575. hop. Fixes bug 23100; bugfix on 0.2.2.2-alpha.
  9576. o Minor bugfixes (relay, crash, backport from 0.3.4.1-alpha):
  9577. - Avoid a crash when running with DirPort set but ORPort turned off.
  9578. Fixes a case of bug 23693; bugfix on 0.3.1.1-alpha.
  9579. o Minor bugfixes (Rust FFI):
  9580. - Fix a minor memory leak which would happen whenever the C code
  9581. would call the Rust implementation of
  9582. protover_get_supported_protocols(). This was due to the C version
  9583. returning a static string, whereas the Rust version newly allocated
  9584. a CString to pass across the FFI boundary. Consequently, the C
  9585. code was not expecting to need to free() what it was given. Fixes
  9586. bug 25127; bugfix on 0.3.2.1-alpha.
  9587. o Minor bugfixes (spelling):
  9588. - Use the "misspell" tool to detect and fix typos throughout the
  9589. source code. Fixes bug 23650; bugfix on various versions of Tor.
  9590. Patch from Deepesh Pathak.
  9591. o Minor bugfixes (testing):
  9592. - Avoid intermittent test failures due to a test that had relied on
  9593. onion service introduction point creation finishing within 5
  9594. seconds of real clock time. Fixes bug 25450; bugfix
  9595. on 0.3.1.3-alpha.
  9596. - Give out Exit flags in bootstrapping networks. Fixes bug 24137;
  9597. bugfix on 0.2.3.1-alpha.
  9598. o Minor bugfixes (unit test, monotonic time):
  9599. - Increase a constant (1msec to 10msec) in the monotonic time test
  9600. that makes sure the nsec/usec/msec times read are synchronized.
  9601. This change was needed to accommodate slow systems like armel or
  9602. when the clock_gettime() is not a VDSO on the running kernel.
  9603. Fixes bug 25113; bugfix on 0.2.9.1.
  9604. o Code simplification and refactoring:
  9605. - Move the list of default directory authorities to its own file.
  9606. Closes ticket 24854. Patch by "beastr0".
  9607. - Remove the old (deterministic) directory retry logic entirely:
  9608. We've used exponential backoff exclusively for some time. Closes
  9609. ticket 23814.
  9610. - Remove the unused nodelist_recompute_all_hsdir_indices(). Closes
  9611. ticket 25108.
  9612. - Remove a series of counters used to track circuit extend attempts
  9613. and connection status but that in reality we aren't using for
  9614. anything other than stats logged by a SIGUSR1 signal. Closes
  9615. ticket 25163.
  9616. - Remove /usr/athena from search path in configure.ac. Closes
  9617. ticket 24363.
  9618. - Remove duplicate code in node_has_curve25519_onion_key() and
  9619. node_get_curve25519_onion_key(), and add a check for a zero
  9620. microdesc curve25519 onion key. Closes ticket 23966, patch by
  9621. "aruna1234" and teor.
  9622. - Rewrite channel_rsa_id_group_set_badness to reduce temporary
  9623. memory allocations with large numbers of OR connections (e.g.
  9624. relays). Closes ticket 24119.
  9625. - Separate the function that deletes ephemeral files when Tor
  9626. stops gracefully.
  9627. - Small changes to Tor's buf_t API to make it suitable for use as a
  9628. general-purpose safe string constructor. Closes ticket 22342.
  9629. - Switch -Wnormalized=id to -Wnormalized=nfkc in configure.ac to
  9630. avoid source code identifier confusion. Closes ticket 24467.
  9631. - The tor_git_revision[] constant no longer needs to be redeclared
  9632. by everything that links against the rest of Tor. Done as part of
  9633. ticket 23845, to simplify our external API.
  9634. - We make extend_info_from_node() use node_get_curve25519_onion_key()
  9635. introduced in ticket 23577 to access the curve25519 public keys
  9636. rather than accessing it directly. Closes ticket 23760. Patch by
  9637. Neel Chauhan.
  9638. - Add a function to log channels' scheduler state changes to aid
  9639. debugging efforts. Closes ticket 24531.
  9640. o Documentation:
  9641. - Improved the documentation of AccountingStart parameter. Closes
  9642. ticket 23635.
  9643. - Update the documentation for "Log" to include the current list of
  9644. logging domains. Closes ticket 25378.
  9645. - Add documentation on how to build tor with Rust dependencies
  9646. without having to be online. Closes ticket 22907; bugfix
  9647. on 0.3.0.3-alpha.
  9648. - Clarify the behavior of RelayBandwidth{Rate,Burst} with client
  9649. traffic. Closes ticket 24318.
  9650. - Document that OutboundBindAddress doesn't apply to DNS requests.
  9651. Closes ticket 22145. Patch from Aruna Maurya.
  9652. o Code simplification and refactoring (channels):
  9653. - Remove the incoming and outgoing channel queues. These were never
  9654. used, but still took up a step in our fast path.
  9655. - The majority of the channel unit tests have been rewritten and the
  9656. code coverage has now been raised to 83.6% for channel.c. Closes
  9657. ticket 23709.
  9658. - Remove other dead code from the channel subsystem: All together,
  9659. this cleanup has removed more than 1500 lines of code overall and
  9660. adding very little except for unit test.
  9661. o Code simplification and refactoring (circuit rendezvous):
  9662. - Split the client-side rendezvous circuit lookup into two
  9663. functions: one that returns only established circuits and another
  9664. that returns all kinds of circuits. Closes ticket 23459.
  9665. o Code simplification and refactoring (controller):
  9666. - Make most of the variables in networkstatus_getinfo_by_purpose()
  9667. const. Implements ticket 24489.
  9668. o Documentation (backport from 0.3.4.1-alpha):
  9669. - Correct an IPv6 error in the documentation for ExitPolicy. Closes
  9670. ticket 25857. Patch from "CTassisF".
  9671. o Documentation (man page):
  9672. - The HiddenServiceVersion torrc option accepts only one number:
  9673. either version 2 or 3. Closes ticket 25026; bugfix
  9674. on 0.3.2.2-alpha.
  9675. o Documentation (manpage, denial of service):
  9676. - Provide more detail about the denial-of-service options, by
  9677. listing each mitigation and explaining how they relate. Closes
  9678. ticket 25248.
  9679. Changes in version 0.3.1.10 - 2018-03-03
  9680. Tor 0.3.1.10 backports a number of bugfixes, including important fixes for
  9681. security issues.
  9682. It includes an important security fix for a remote crash attack
  9683. against directory authorities, tracked as TROVE-2018-001.
  9684. This release also backports our new system for improved resistance to
  9685. denial-of-service attacks against relays.
  9686. This release also fixes several minor bugs and annoyances from
  9687. earlier releases.
  9688. All directory authorities should upgrade to one of the versions
  9689. released today. Relays running 0.3.1.x may wish to update to one of
  9690. the versions released today, for the DoS mitigations.
  9691. Please note: according to our release calendar, Tor 0.3.1 will no
  9692. longer be supported after 1 July 2018. If you will be running Tor
  9693. after that date, you should make sure to plan to upgrade to the latest
  9694. stable version, or downgrade to 0.2.9 (which will receive long-term
  9695. support).
  9696. o Major bugfixes (denial-of-service, directory authority, backport from 0.3.3.3-alpha):
  9697. - Fix a protocol-list handling bug that could be used to remotely crash
  9698. directory authorities with a null-pointer exception. Fixes bug 25074;
  9699. bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2018-001 and
  9700. CVE-2018-0490.
  9701. o Major features (denial-of-service mitigation, backport from 0.3.3.2-alpha):
  9702. - Give relays some defenses against the recent network overload. We
  9703. start with three defenses (default parameters in parentheses).
  9704. First: if a single client address makes too many concurrent
  9705. connections (>100), hang up on further connections. Second: if a
  9706. single client address makes circuits too quickly (more than 3 per
  9707. second, with an allowed burst of 90) while also having too many
  9708. connections open (3), refuse new create cells for the next while
  9709. (1-2 hours). Third: if a client asks to establish a rendezvous
  9710. point to you directly, ignore the request. These defenses can be
  9711. manually controlled by new torrc options, but relays will also
  9712. take guidance from consensus parameters, so there's no need to
  9713. configure anything manually. Implements ticket 24902.
  9714. o Minor features (linux seccomp2 sandbox, backport from 0.3.2.5-alpha):
  9715. - Update the sandbox rules so that they should now work correctly
  9716. with Glibc 2.26. Closes ticket 24315.
  9717. o Major bugfixes (onion services, retry behavior, backport from 0.3.3.1-alpha):
  9718. - Fix an "off by 2" error in counting rendezvous failures on the
  9719. onion service side. While we thought we would stop the rendezvous
  9720. attempt after one failed circuit, we were actually making three
  9721. circuit attempts before giving up. Now switch to a default of 2,
  9722. and allow the consensus parameter "hs_service_max_rdv_failures" to
  9723. override. Fixes bug 24895; bugfix on 0.0.6.
  9724. o Major bugfixes (protocol versions, backport from 0.3.3.2-alpha):
  9725. - Add Link protocol version 5 to the supported protocols list. Fixes
  9726. bug 25070; bugfix on 0.3.1.1-alpha.
  9727. o Major bugfixes (relay, backport from 0.3.3.1-alpha):
  9728. - Fix a set of false positives where relays would consider
  9729. connections to other relays as being client-only connections (and
  9730. thus e.g. deserving different link padding schemes) if those
  9731. relays fell out of the consensus briefly. Now we look only at the
  9732. initial handshake and whether the connection authenticated as a
  9733. relay. Fixes bug 24898; bugfix on 0.3.1.1-alpha.
  9734. o Minor features (denial-of-service avoidance, backport from 0.3.3.2-alpha):
  9735. - Make our OOM handler aware of the geoip client history cache so it
  9736. doesn't fill up the memory. This check is important for IPv6 and
  9737. our DoS mitigation subsystem. Closes ticket 25122.
  9738. o Minor feature (relay statistics, backport from 0.3.2.6-alpha):
  9739. - Change relay bandwidth reporting stats interval from 4 hours to 24
  9740. hours in order to reduce the efficiency of guard discovery
  9741. attacks. Fixes ticket 23856.
  9742. o Minor features (compatibility, OpenSSL, backport from 0.3.3.3-alpha):
  9743. - Tor will now support TLS1.3 once OpenSSL 1.1.1 is released.
  9744. Previous versions of Tor would not have worked with OpenSSL 1.1.1,
  9745. since they neither disabled TLS 1.3 nor enabled any of the
  9746. ciphersuites it requires. Now we enable the TLS 1.3 ciphersuites.
  9747. Closes ticket 24978.
  9748. o Minor features (fallback directory mirrors, backport from 0.3.2.9):
  9749. - The fallback directory list has been re-generated based on the
  9750. current status of the network. Tor uses fallback directories to
  9751. bootstrap when it doesn't yet have up-to-date directory
  9752. information. Closes ticket 24801.
  9753. - Make the default DirAuthorityFallbackRate 0.1, so that clients
  9754. prefer to bootstrap from fallback directory mirrors. This is a
  9755. follow-up to 24679, which removed weights from the default
  9756. fallbacks. Implements ticket 24681.
  9757. o Minor features (geoip):
  9758. - Update geoip and geoip6 to the February 7 2018 Maxmind GeoLite2
  9759. Country database.
  9760. o Minor bugfix (channel connection, backport from 0.3.3.2-alpha):
  9761. - Use the actual observed address of an incoming relay connection,
  9762. not the canonical address of the relay from its descriptor, when
  9763. making decisions about how to handle the incoming connection.
  9764. Fixes bug 24952; bugfix on 0.2.4.11-alpha. Patch by "ffmancera".
  9765. o Minor bugfix (directory authority, backport from 0.3.3.2-alpha):
  9766. - Directory authorities, when refusing a descriptor from a rejected
  9767. relay, now explicitly tell the relay (in its logs) to set a valid
  9768. ContactInfo address and contact the bad-relays@ mailing list.
  9769. Fixes bug 25170; bugfix on 0.2.9.1.
  9770. o Minor bugfixes (address selection, backport from 0.3.2.9):
  9771. - When the fascist_firewall_choose_address_ functions don't find a
  9772. reachable address, set the returned address to the null address
  9773. and port. This is a precautionary measure, because some callers do
  9774. not check the return value. Fixes bug 24736; bugfix
  9775. on 0.2.8.2-alpha.
  9776. o Major bugfixes (bootstrapping, backport from 0.3.2.5-alpha):
  9777. - Fetch descriptors aggressively whenever we lack enough to build
  9778. circuits, regardless of how many descriptors we are missing.
  9779. Previously, we would delay launching the fetch when we had fewer
  9780. than 15 missing descriptors, even if some of those descriptors
  9781. were blocking circuits from building. Fixes bug 23985; bugfix on
  9782. 0.1.1.11-alpha. The effects of this bug became worse in
  9783. 0.3.0.3-alpha, when we began treating missing descriptors from our
  9784. primary guards as a reason to delay circuits.
  9785. - Don't try fetching microdescriptors from relays that have failed
  9786. to deliver them in the past. Fixes bug 23817; bugfix
  9787. on 0.3.0.1-alpha.
  9788. o Minor bugfixes (compilation, backport from 0.3.2.7-rc):
  9789. - Fix a signed/unsigned comparison warning introduced by our fix to
  9790. TROVE-2017-009. Fixes bug 24480; bugfix on 0.2.5.16.
  9791. o Minor bugfixes (control port, linux seccomp2 sandbox, backport from 0.3.2.5-alpha):
  9792. - Avoid a crash when attempting to use the seccomp2 sandbox together
  9793. with the OwningControllerProcess feature. Fixes bug 24198; bugfix
  9794. on 0.2.5.1-alpha.
  9795. o Minor bugfixes (denial-of-service, backport from 0.3.3.3-alpha):
  9796. - Fix a possible crash on malformed consensus. If a consensus had
  9797. contained an unparseable protocol line, it could have made clients
  9798. and relays crash with a null-pointer exception. To exploit this
  9799. issue, however, an attacker would need to be able to subvert the
  9800. directory authority system. Fixes bug 25251; bugfix on
  9801. 0.2.9.4-alpha. Also tracked as TROVE-2018-004.
  9802. o Minor bugfixes (directory cache, backport from 0.3.2.5-alpha):
  9803. - Recover better from empty or corrupt files in the consensus cache
  9804. directory. Fixes bug 24099; bugfix on 0.3.1.1-alpha.
  9805. - When a consensus diff calculation is only partially successful,
  9806. only record the successful parts as having succeeded. Partial
  9807. success can happen if (for example) one compression method fails
  9808. but the others succeed. Previously we misrecorded all the
  9809. calculations as having succeeded, which would later cause a
  9810. nonfatal assertion failure. Fixes bug 24086; bugfix
  9811. on 0.3.1.1-alpha.
  9812. o Minor bugfixes (entry guards, backport from 0.3.2.3-alpha):
  9813. - Tor now updates its guard state when it reads a consensus
  9814. regardless of whether it's missing descriptors. That makes tor use
  9815. its primary guards to fetch descriptors in some edge cases where
  9816. it would previously have used fallback directories. Fixes bug
  9817. 23862; bugfix on 0.3.0.1-alpha.
  9818. o Minor bugfixes (logging, backport from 0.3.3.2-alpha):
  9819. - Don't treat inability to store a cached consensus object as a bug:
  9820. it can happen normally when we are out of disk space. Fixes bug
  9821. 24859; bugfix on 0.3.1.1-alpha.
  9822. o Minor bugfixes (memory usage, backport from 0.3.2.8-rc):
  9823. - When queuing DESTROY cells on a channel, only queue the circuit-id
  9824. and reason fields: not the entire 514-byte cell. This fix should
  9825. help mitigate any bugs or attacks that fill up these queues, and
  9826. free more RAM for other uses. Fixes bug 24666; bugfix
  9827. on 0.2.5.1-alpha.
  9828. o Minor bugfixes (network layer, backport from 0.3.2.5-alpha):
  9829. - When closing a connection via close_connection_immediately(), we
  9830. mark it as "not blocked on bandwidth", to prevent later calls from
  9831. trying to unblock it, and give it permission to read. This fixes a
  9832. backtrace warning that can happen on relays under various
  9833. circumstances. Fixes bug 24167; bugfix on 0.1.0.1-rc.
  9834. o Minor bugfixes (path selection, backport from 0.3.2.4-alpha):
  9835. - When selecting relays by bandwidth, avoid a rounding error that
  9836. could sometimes cause load to be imbalanced incorrectly.
  9837. Previously, we would always round upwards; now, we round towards
  9838. the nearest integer. This had the biggest effect when a relay's
  9839. weight adjustments should have given it weight 0, but it got
  9840. weight 1 instead. Fixes bug 23318; bugfix on 0.2.4.3-alpha.
  9841. - When calculating the fraction of nodes that have descriptors, and
  9842. all nodes in the network have zero bandwidths, count the number of
  9843. nodes instead. Fixes bug 23318; bugfix on 0.2.4.10-alpha.
  9844. - Actually log the total bandwidth in compute_weighted_bandwidths().
  9845. Fixes bug 24170; bugfix on 0.2.4.3-alpha.
  9846. o Minor bugfixes (performance, fragile-hardening, backport from 0.3.3.1-alpha):
  9847. - Improve the performance of our consensus-diff application code
  9848. when Tor is built with the --enable-fragile-hardening option set.
  9849. Fixes bug 24826; bugfix on 0.3.1.1-alpha.
  9850. o Minor bugfixes (OSX, backport from 0.3.3.1-alpha):
  9851. - Don't exit the Tor process if setrlimit() fails to change the file
  9852. limit (which can happen sometimes on some versions of OSX). Fixes
  9853. bug 21074; bugfix on 0.0.9pre5.
  9854. o Minor bugfixes (portability, msvc, backport from 0.3.2.9):
  9855. - Fix a bug in the bit-counting parts of our timing-wheel code on
  9856. MSVC. (Note that MSVC is still not a supported build platform, due
  9857. to cyptographic timing channel risks.) Fixes bug 24633; bugfix
  9858. on 0.2.9.1-alpha.
  9859. o Minor bugfixes (relay, partial backport):
  9860. - Make the internal channel_is_client() function look at what sort
  9861. of connection handshake the other side used, rather than whether
  9862. the other side ever sent a create_fast cell to us. Backports part
  9863. of the fixes from bugs 22805 and 24898.
  9864. o Minor bugfixes (spec conformance, backport from 0.3.3.3-alpha):
  9865. - Forbid "-0" as a protocol version. Fixes part of bug 25249; bugfix on
  9866. 0.2.9.4-alpha.
  9867. - Forbid UINT32_MAX as a protocol version. Fixes part of bug 25249;
  9868. bugfix on 0.2.9.4-alpha.
  9869. o Code simplification and refactoring (backport from 0.3.3.3-alpha):
  9870. - Update the "rust dependencies" submodule to be a project-level
  9871. repository, rather than a user repository. Closes ticket 25323.
  9872. Changes in version 0.2.9.15 - 2018-03-03
  9873. Tor 0.2.9.15 backports important security and stability bugfixes from
  9874. later Tor releases.
  9875. It includes an important security fix for a remote crash attack
  9876. against directory authorities, tracked as TROVE-2018-001.
  9877. This release also backports our new system for improved resistance to
  9878. denial-of-service attacks against relays.
  9879. This release also fixes several minor bugs and annoyances from
  9880. earlier releases.
  9881. All directory authorities should upgrade to one of the versions
  9882. released today. Relays running 0.2.9.x may wish to update to one of
  9883. the versions released today, for the DoS mitigations.
  9884. o Major bugfixes (denial-of-service, directory authority, backport from 0.3.3.3-alpha):
  9885. - Fix a protocol-list handling bug that could be used to remotely crash
  9886. directory authorities with a null-pointer exception. Fixes bug 25074;
  9887. bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2018-001 and
  9888. CVE-2018-0490.
  9889. o Major features (denial-of-service mitigation):
  9890. - Give relays some defenses against the recent network overload. We
  9891. start with three defenses (default parameters in parentheses).
  9892. First: if a single client address makes too many concurrent
  9893. connections (>100), hang up on further connections. Second: if a
  9894. single client address makes circuits too quickly (more than 3 per
  9895. second, with an allowed burst of 90) while also having too many
  9896. connections open (3), refuse new create cells for the next while
  9897. (1-2 hours). Third: if a client asks to establish a rendezvous
  9898. point to you directly, ignore the request. These defenses can be
  9899. manually controlled by new torrc options, but relays will also
  9900. take guidance from consensus parameters, so there's no need to
  9901. configure anything manually. Implements ticket 24902.
  9902. o Major bugfixes (bootstrapping):
  9903. - Fetch descriptors aggressively whenever we lack enough to build
  9904. circuits, regardless of how many descriptors we are missing.
  9905. Previously, we would delay launching the fetch when we had fewer
  9906. than 15 missing descriptors, even if some of those descriptors
  9907. were blocking circuits from building. Fixes bug 23985; bugfix on
  9908. 0.1.1.11-alpha. The effects of this bug became worse in
  9909. 0.3.0.3-alpha, when we began treating missing descriptors from our
  9910. primary guards as a reason to delay circuits.
  9911. o Major bugfixes (onion services, retry behavior):
  9912. - Fix an "off by 2" error in counting rendezvous failures on the
  9913. onion service side. While we thought we would stop the rendezvous
  9914. attempt after one failed circuit, we were actually making three
  9915. circuit attempts before giving up. Now switch to a default of 2,
  9916. and allow the consensus parameter "hs_service_max_rdv_failures" to
  9917. override. Fixes bug 24895; bugfix on 0.0.6.
  9918. o Minor feature (relay statistics):
  9919. - Change relay bandwidth reporting stats interval from 4 hours to 24
  9920. hours in order to reduce the efficiency of guard discovery
  9921. attacks. Fixes ticket 23856.
  9922. o Minor features (compatibility, OpenSSL):
  9923. - Tor will now support TLS1.3 once OpenSSL 1.1.1 is released.
  9924. Previous versions of Tor would not have worked with OpenSSL 1.1.1,
  9925. since they neither disabled TLS 1.3 nor enabled any of the
  9926. ciphersuites it requires. Now we enable the TLS 1.3 ciphersuites.
  9927. Closes ticket 24978.
  9928. o Minor features (denial-of-service avoidance):
  9929. - Make our OOM handler aware of the geoip client history cache so it
  9930. doesn't fill up the memory. This check is important for IPv6 and
  9931. our DoS mitigation subsystem. Closes ticket 25122.
  9932. o Minor features (fallback directory mirrors):
  9933. - The fallback directory list has been re-generated based on the
  9934. current status of the network. Tor uses fallback directories to
  9935. bootstrap when it doesn't yet have up-to-date directory
  9936. information. Closes ticket 24801.
  9937. - Make the default DirAuthorityFallbackRate 0.1, so that clients
  9938. prefer to bootstrap from fallback directory mirrors. This is a
  9939. follow-up to 24679, which removed weights from the default
  9940. fallbacks. Implements ticket 24681.
  9941. o Minor features (geoip):
  9942. - Update geoip and geoip6 to the February 7 2018 Maxmind GeoLite2
  9943. Country database.
  9944. o Minor features (linux seccomp2 sandbox):
  9945. - Update the sandbox rules so that they should now work correctly
  9946. with Glibc 2.26. Closes ticket 24315.
  9947. o Minor bugfix (channel connection):
  9948. - Use the actual observed address of an incoming relay connection,
  9949. not the canonical address of the relay from its descriptor, when
  9950. making decisions about how to handle the incoming connection.
  9951. Fixes bug 24952; bugfix on 0.2.4.11-alpha. Patch by "ffmancera".
  9952. o Minor bugfix (directory authority):
  9953. - Directory authorities, when refusing a descriptor from a rejected
  9954. relay, now explicitly tell the relay (in its logs) to set a valid
  9955. ContactInfo address and contact the bad-relays@ mailing list.
  9956. Fixes bug 25170; bugfix on 0.2.9.1.
  9957. o Minor bugfixes (address selection):
  9958. - When the fascist_firewall_choose_address_ functions don't find a
  9959. reachable address, set the returned address to the null address
  9960. and port. This is a precautionary measure, because some callers do
  9961. not check the return value. Fixes bug 24736; bugfix
  9962. on 0.2.8.2-alpha.
  9963. o Minor bugfixes (compilation):
  9964. - Fix a signed/unsigned comparison warning introduced by our fix to
  9965. TROVE-2017-009. Fixes bug 24480; bugfix on 0.2.5.16.
  9966. o Minor bugfixes (control port, linux seccomp2 sandbox):
  9967. - Avoid a crash when attempting to use the seccomp2 sandbox together
  9968. with the OwningControllerProcess feature. Fixes bug 24198; bugfix
  9969. on 0.2.5.1-alpha.
  9970. o Minor bugfixes (denial-of-service, backport from 0.3.3.3-alpha):
  9971. - Fix a possible crash on malformed consensus. If a consensus had
  9972. contained an unparseable protocol line, it could have made clients
  9973. and relays crash with a null-pointer exception. To exploit this
  9974. issue, however, an attacker would need to be able to subvert the
  9975. directory authority system. Fixes bug 25251; bugfix on
  9976. 0.2.9.4-alpha. Also tracked as TROVE-2018-004.
  9977. o Minor bugfixes (memory usage):
  9978. - When queuing DESTROY cells on a channel, only queue the circuit-id
  9979. and reason fields: not the entire 514-byte cell. This fix should
  9980. help mitigate any bugs or attacks that fill up these queues, and
  9981. free more RAM for other uses. Fixes bug 24666; bugfix
  9982. on 0.2.5.1-alpha.
  9983. o Minor bugfixes (network layer):
  9984. - When closing a connection via close_connection_immediately(), we
  9985. mark it as "not blocked on bandwidth", to prevent later calls from
  9986. trying to unblock it, and give it permission to read. This fixes a
  9987. backtrace warning that can happen on relays under various
  9988. circumstances. Fixes bug 24167; bugfix on 0.1.0.1-rc.
  9989. o Minor bugfixes (OSX):
  9990. - Don't exit the Tor process if setrlimit() fails to change the file
  9991. limit (which can happen sometimes on some versions of OSX). Fixes
  9992. bug 21074; bugfix on 0.0.9pre5.
  9993. o Minor bugfixes (path selection):
  9994. - When selecting relays by bandwidth, avoid a rounding error that
  9995. could sometimes cause load to be imbalanced incorrectly.
  9996. Previously, we would always round upwards; now, we round towards
  9997. the nearest integer. This had the biggest effect when a relay's
  9998. weight adjustments should have given it weight 0, but it got
  9999. weight 1 instead. Fixes bug 23318; bugfix on 0.2.4.3-alpha.
  10000. - When calculating the fraction of nodes that have descriptors, and
  10001. all nodes in the network have zero bandwidths, count the number of
  10002. nodes instead. Fixes bug 23318; bugfix on 0.2.4.10-alpha.
  10003. - Actually log the total bandwidth in compute_weighted_bandwidths().
  10004. Fixes bug 24170; bugfix on 0.2.4.3-alpha.
  10005. o Minor bugfixes (portability, msvc):
  10006. - Fix a bug in the bit-counting parts of our timing-wheel code on
  10007. MSVC. (Note that MSVC is still not a supported build platform, due
  10008. to cryptographic timing channel risks.) Fixes bug 24633; bugfix
  10009. on 0.2.9.1-alpha.
  10010. o Minor bugfixes (relay):
  10011. - Make the internal channel_is_client() function look at what sort
  10012. of connection handshake the other side used, rather than whether
  10013. the other side ever sent a create_fast cell to us. Backports part
  10014. of the fixes from bugs 22805 and 24898.
  10015. o Minor bugfixes (spec conformance, backport from 0.3.3.3-alpha):
  10016. - Forbid "-0" as a protocol version. Fixes part of bug 25249; bugfix on
  10017. 0.2.9.4-alpha.
  10018. - Forbid UINT32_MAX as a protocol version. Fixes part of bug 25249;
  10019. bugfix on 0.2.9.4-alpha.
  10020. Changes in version 0.3.2.10 - 2018-03-03
  10021. Tor 0.3.2.10 is the second stable release in the 0.3.2 series. It
  10022. backports a number of bugfixes, including important fixes for security
  10023. issues.
  10024. It includes an important security fix for a remote crash attack
  10025. against directory authorities, tracked as TROVE-2018-001.
  10026. Additionally, it backports a fix for a bug whose severity we have
  10027. upgraded: Bug 24700, which was fixed in 0.3.3.2-alpha, can be remotely
  10028. triggered in order to crash relays with a use-after-free pattern. As
  10029. such, we are now tracking that bug as TROVE-2018-002 and
  10030. CVE-2018-0491, and backporting it to earlier releases. This bug
  10031. affected versions 0.3.2.1-alpha through 0.3.2.9, as well as version
  10032. 0.3.3.1-alpha.
  10033. This release also backports our new system for improved resistance to
  10034. denial-of-service attacks against relays.
  10035. This release also fixes several minor bugs and annoyances from
  10036. earlier releases.
  10037. Relays running 0.3.2.x SHOULD upgrade to one of the versions released
  10038. today, for the fix to TROVE-2018-002. Directory authorities should
  10039. also upgrade. (Relays on earlier versions might want to update too for
  10040. the DoS mitigations.)
  10041. o Major bugfixes (denial-of-service, directory authority, backport from 0.3.3.3-alpha):
  10042. - Fix a protocol-list handling bug that could be used to remotely crash
  10043. directory authorities with a null-pointer exception. Fixes bug 25074;
  10044. bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2018-001 and
  10045. CVE-2018-0490.
  10046. o Major bugfixes (scheduler, KIST, denial-of-service, backport from 0.3.3.2-alpha):
  10047. - Avoid adding the same channel twice in the KIST scheduler pending
  10048. list, which could lead to remote denial-of-service use-after-free
  10049. attacks against relays. Fixes bug 24700; bugfix on 0.3.2.1-alpha.
  10050. o Major features (denial-of-service mitigation, backport from 0.3.3.2-alpha):
  10051. - Give relays some defenses against the recent network overload. We
  10052. start with three defenses (default parameters in parentheses).
  10053. First: if a single client address makes too many concurrent
  10054. connections (>100), hang up on further connections. Second: if a
  10055. single client address makes circuits too quickly (more than 3 per
  10056. second, with an allowed burst of 90) while also having too many
  10057. connections open (3), refuse new create cells for the next while
  10058. (1-2 hours). Third: if a client asks to establish a rendezvous
  10059. point to you directly, ignore the request. These defenses can be
  10060. manually controlled by new torrc options, but relays will also
  10061. take guidance from consensus parameters, so there's no need to
  10062. configure anything manually. Implements ticket 24902.
  10063. o Major bugfixes (onion services, retry behavior, backport from 0.3.3.1-alpha):
  10064. - Fix an "off by 2" error in counting rendezvous failures on the
  10065. onion service side. While we thought we would stop the rendezvous
  10066. attempt after one failed circuit, we were actually making three
  10067. circuit attempts before giving up. Now switch to a default of 2,
  10068. and allow the consensus parameter "hs_service_max_rdv_failures" to
  10069. override. Fixes bug 24895; bugfix on 0.0.6.
  10070. - New-style (v3) onion services now obey the "max rendezvous circuit
  10071. attempts" logic. Previously they would make as many rendezvous
  10072. circuit attempts as they could fit in the MAX_REND_TIMEOUT second
  10073. window before giving up. Fixes bug 24894; bugfix on 0.3.2.1-alpha.
  10074. o Major bugfixes (protocol versions, backport from 0.3.3.2-alpha):
  10075. - Add Link protocol version 5 to the supported protocols list. Fixes
  10076. bug 25070; bugfix on 0.3.1.1-alpha.
  10077. o Major bugfixes (relay, backport from 0.3.3.1-alpha):
  10078. - Fix a set of false positives where relays would consider
  10079. connections to other relays as being client-only connections (and
  10080. thus e.g. deserving different link padding schemes) if those
  10081. relays fell out of the consensus briefly. Now we look only at the
  10082. initial handshake and whether the connection authenticated as a
  10083. relay. Fixes bug 24898; bugfix on 0.3.1.1-alpha.
  10084. o Major bugfixes (scheduler, consensus, backport from 0.3.3.2-alpha):
  10085. - The scheduler subsystem was failing to promptly notice changes in
  10086. consensus parameters, making it harder to switch schedulers
  10087. network-wide. Fixes bug 24975; bugfix on 0.3.2.1-alpha.
  10088. o Minor features (denial-of-service avoidance, backport from 0.3.3.2-alpha):
  10089. - Make our OOM handler aware of the geoip client history cache so it
  10090. doesn't fill up the memory. This check is important for IPv6 and
  10091. our DoS mitigation subsystem. Closes ticket 25122.
  10092. o Minor features (compatibility, OpenSSL, backport from 0.3.3.3-alpha):
  10093. - Tor will now support TLS1.3 once OpenSSL 1.1.1 is released.
  10094. Previous versions of Tor would not have worked with OpenSSL 1.1.1,
  10095. since they neither disabled TLS 1.3 nor enabled any of the
  10096. ciphersuites it requires. Now we enable the TLS 1.3 ciphersuites.
  10097. Closes ticket 24978.
  10098. o Minor features (geoip):
  10099. - Update geoip and geoip6 to the February 7 2018 Maxmind GeoLite2
  10100. Country database.
  10101. o Minor features (logging, diagnostic, backport from 0.3.3.2-alpha):
  10102. - When logging a failure to create an onion service's descriptor,
  10103. also log what the problem with the descriptor was. Diagnostic
  10104. for ticket 24972.
  10105. o Minor bugfix (channel connection, backport from 0.3.3.2-alpha):
  10106. - Use the actual observed address of an incoming relay connection,
  10107. not the canonical address of the relay from its descriptor, when
  10108. making decisions about how to handle the incoming connection.
  10109. Fixes bug 24952; bugfix on 0.2.4.11-alpha. Patch by "ffmancera".
  10110. o Minor bugfixes (denial-of-service, backport from 0.3.3.3-alpha):
  10111. - Fix a possible crash on malformed consensus. If a consensus had
  10112. contained an unparseable protocol line, it could have made clients
  10113. and relays crash with a null-pointer exception. To exploit this
  10114. issue, however, an attacker would need to be able to subvert the
  10115. directory authority system. Fixes bug 25251; bugfix on
  10116. 0.2.9.4-alpha. Also tracked as TROVE-2018-004.
  10117. o Minor bugfix (directory authority, backport from 0.3.3.2-alpha):
  10118. - Directory authorities, when refusing a descriptor from a rejected
  10119. relay, now explicitly tell the relay (in its logs) to set a valid
  10120. ContactInfo address and contact the bad-relays@ mailing list.
  10121. Fixes bug 25170; bugfix on 0.2.9.1.
  10122. o Minor bugfixes (build, rust, backport from 0.3.3.1-alpha):
  10123. - When building with Rust on OSX, link against libresolv, to work
  10124. around the issue at https://github.com/rust-lang/rust/issues/46797.
  10125. Fixes bug 24652; bugfix on 0.3.1.1-alpha.
  10126. o Minor bugfixes (onion services, backport from 0.3.3.2-alpha):
  10127. - Remove a BUG() statement when a client fetches an onion descriptor
  10128. that has a lower revision counter than the one in its cache. This
  10129. can happen in normal circumstances due to HSDir desync. Fixes bug
  10130. 24976; bugfix on 0.3.2.1-alpha.
  10131. o Minor bugfixes (logging, backport from 0.3.3.2-alpha):
  10132. - Don't treat inability to store a cached consensus object as a bug:
  10133. it can happen normally when we are out of disk space. Fixes bug
  10134. 24859; bugfix on 0.3.1.1-alpha.
  10135. o Minor bugfixes (performance, fragile-hardening, backport from 0.3.3.1-alpha):
  10136. - Improve the performance of our consensus-diff application code
  10137. when Tor is built with the --enable-fragile-hardening option set.
  10138. Fixes bug 24826; bugfix on 0.3.1.1-alpha.
  10139. o Minor bugfixes (OSX, backport from 0.3.3.1-alpha):
  10140. - Don't exit the Tor process if setrlimit() fails to change the file
  10141. limit (which can happen sometimes on some versions of OSX). Fixes
  10142. bug 21074; bugfix on 0.0.9pre5.
  10143. o Minor bugfixes (spec conformance, backport from 0.3.3.3-alpha):
  10144. - Forbid "-0" as a protocol version. Fixes part of bug 25249; bugfix on
  10145. 0.2.9.4-alpha.
  10146. - Forbid UINT32_MAX as a protocol version. Fixes part of bug 25249;
  10147. bugfix on 0.2.9.4-alpha.
  10148. o Minor bugfixes (testing, backport from 0.3.3.1-alpha):
  10149. - Fix a memory leak in the scheduler/loop_kist unit test. Fixes bug
  10150. 25005; bugfix on 0.3.2.7-rc.
  10151. o Minor bugfixes (v3 onion services, backport from 0.3.3.2-alpha):
  10152. - Look at the "HSRend" protocol version, not the "HSDir" protocol
  10153. version, when deciding whether a consensus entry can support the
  10154. v3 onion service protocol as a rendezvous point. Fixes bug 25105;
  10155. bugfix on 0.3.2.1-alpha.
  10156. o Code simplification and refactoring (backport from 0.3.3.3-alpha):
  10157. - Update the "rust dependencies" submodule to be a project-level
  10158. repository, rather than a user repository. Closes ticket 25323.
  10159. o Documentation (backport from 0.3.3.1-alpha)
  10160. - Document that operators who run more than one relay or bridge are
  10161. expected to set MyFamily and ContactInfo correctly. Closes
  10162. ticket 24526.
  10163. Changes in version 0.3.2.9 - 2018-01-09
  10164. Tor 0.3.2.9 is the first stable release in the 0.3.2 series.
  10165. The 0.3.2 series includes our long-anticipated new onion service
  10166. design, with numerous security features. (For more information, see
  10167. our blog post at https://blog.torproject.org/fall-harvest.) We also
  10168. have a new circuit scheduler algorithm for improved performance on
  10169. relays everywhere (see https://blog.torproject.org/kist-and-tell),
  10170. along with many smaller features and bugfixes.
  10171. Per our stable release policy, we plan to support each stable release
  10172. series for at least the next nine months, or for three months after
  10173. the first stable release of the next series: whichever is longer. If
  10174. you need a release with long-term support, we recommend that you stay
  10175. with the 0.2.9 series.
  10176. Below is a list of the changes since 0.3.1.7. For a list of all
  10177. changes since 0.3.2.8-rc, see the ChangeLog file.
  10178. o Directory authority changes:
  10179. - Add "Bastet" as a ninth directory authority to the default list.
  10180. Closes ticket 23910.
  10181. - The directory authority "Longclaw" has changed its IP address.
  10182. Closes ticket 23592.
  10183. - Remove longclaw's IPv6 address, as it will soon change. Authority
  10184. IPv6 addresses were originally added in 0.2.8.1-alpha. This leaves
  10185. 3/8 directory authorities with IPv6 addresses, but there are also
  10186. 52 fallback directory mirrors with IPv6 addresses. Resolves 19760.
  10187. - Add an IPv6 address for the "bastet" directory authority. Closes
  10188. ticket 24394.
  10189. o Major features (next-generation onion services):
  10190. - Tor now supports the next-generation onion services protocol for
  10191. clients and services! As part of this release, the core of
  10192. proposal 224 has been implemented and is available for
  10193. experimentation and testing by our users. This newer version of
  10194. onion services ("v3") features many improvements over the legacy
  10195. system, including:
  10196. a) Better crypto (replaced SHA1/DH/RSA1024
  10197. with SHA3/ed25519/curve25519)
  10198. b) Improved directory protocol, leaking much less information to
  10199. directory servers.
  10200. c) Improved directory protocol, with smaller surface for
  10201. targeted attacks.
  10202. d) Better onion address security against impersonation.
  10203. e) More extensible introduction/rendezvous protocol.
  10204. f) A cleaner and more modular codebase.
  10205. You can identify a next-generation onion address by its length:
  10206. they are 56 characters long, as in
  10207. "4acth47i6kxnvkewtm6q7ib2s3ufpo5sqbsnzjpbi7utijcltosqemad.onion".
  10208. In the future, we will release more options and features for v3
  10209. onion services, but we first need a testing period, so that the
  10210. current codebase matures and becomes more robust. Planned features
  10211. include: offline keys, advanced client authorization, improved
  10212. guard algorithms, and statistics. For full details, see
  10213. proposal 224.
  10214. Legacy ("v2") onion services will still work for the foreseeable
  10215. future, and will remain the default until this new codebase gets
  10216. tested and hardened. Service operators who want to experiment with
  10217. the new system can use the 'HiddenServiceVersion 3' torrc
  10218. directive along with the regular onion service configuration
  10219. options. For more information, see our blog post at
  10220. "https://blog.torproject.org/fall-harvest". Enjoy!
  10221. o Major feature (scheduler, channel):
  10222. - Tor now uses new schedulers to decide which circuits should
  10223. deliver cells first, in order to improve congestion at relays. The
  10224. first type is called "KIST" ("Kernel Informed Socket Transport"),
  10225. and is only available on Linux-like systems: it uses feedback from
  10226. the kernel to prevent the kernel's TCP buffers from growing too
  10227. full. The second new scheduler type is called "KISTLite": it
  10228. behaves the same as KIST, but runs on systems without kernel
  10229. support for inspecting TCP implementation details. The old
  10230. scheduler is still available, under the name "Vanilla". To change
  10231. the default scheduler preference order, use the new "Schedulers"
  10232. option. (The default preference order is "KIST,KISTLite,Vanilla".)
  10233. Matt Traudt implemented KIST, based on research by Rob Jansen,
  10234. John Geddes, Christ Wacek, Micah Sherr, and Paul Syverson. For
  10235. more information, see the design paper at
  10236. http://www.robgjansen.com/publications/kist-sec2014.pdf and the
  10237. followup implementation paper at https://arxiv.org/abs/1709.01044.
  10238. Closes ticket 12541. For more information, see our blog post at
  10239. "https://blog.torproject.org/kist-and-tell".
  10240. o Major bugfixes (security, general):
  10241. - Fix a denial of service bug where an attacker could use a
  10242. malformed directory object to cause a Tor instance to pause while
  10243. OpenSSL would try to read a passphrase from the terminal. (Tor
  10244. instances run without a terminal, which is the case for most Tor
  10245. packages, are not impacted.) Fixes bug 24246; bugfix on every
  10246. version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
  10247. Found by OSS-Fuzz as testcase 6360145429790720.
  10248. o Major bugfixes (security, directory authority):
  10249. - Fix a denial of service issue where an attacker could crash a
  10250. directory authority using a malformed router descriptor. Fixes bug
  10251. 24245; bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2017-010
  10252. and CVE-2017-8820.
  10253. o Major bugfixes (security, onion service v2):
  10254. - Fix a use-after-free error that could crash v2 Tor onion services
  10255. when they failed to open circuits while expiring introduction
  10256. points. Fixes bug 24313; bugfix on 0.2.7.2-alpha. This issue is
  10257. also tracked as TROVE-2017-013 and CVE-2017-8823.
  10258. - When checking for replays in the INTRODUCE1 cell data for a
  10259. (legacy) onion service, correctly detect replays in the RSA-
  10260. encrypted part of the cell. We were previously checking for
  10261. replays on the entire cell, but those can be circumvented due to
  10262. the malleability of Tor's legacy hybrid encryption. This fix helps
  10263. prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
  10264. 0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
  10265. and CVE-2017-8819.
  10266. o Major bugfixes (security, relay):
  10267. - When running as a relay, make sure that we never build a path
  10268. through ourselves, even in the case where we have somehow lost the
  10269. version of our descriptor appearing in the consensus. Fixes part
  10270. of bug 21534; bugfix on 0.2.0.1-alpha. This issue is also tracked
  10271. as TROVE-2017-012 and CVE-2017-8822.
  10272. - When running as a relay, make sure that we never choose ourselves
  10273. as a guard. Fixes part of bug 21534; bugfix on 0.3.0.1-alpha. This
  10274. issue is also tracked as TROVE-2017-012 and CVE-2017-8822.
  10275. o Major bugfixes (bootstrapping):
  10276. - Fetch descriptors aggressively whenever we lack enough to build
  10277. circuits, regardless of how many descriptors we are missing.
  10278. Previously, we would delay launching the fetch when we had fewer
  10279. than 15 missing descriptors, even if some of those descriptors
  10280. were blocking circuits from building. Fixes bug 23985; bugfix on
  10281. 0.1.1.11-alpha. The effects of this bug became worse in
  10282. 0.3.0.3-alpha, when we began treating missing descriptors from our
  10283. primary guards as a reason to delay circuits.
  10284. - Don't try fetching microdescriptors from relays that have failed
  10285. to deliver them in the past. Fixes bug 23817; bugfix
  10286. on 0.3.0.1-alpha.
  10287. o Major bugfixes (circuit prediction):
  10288. - Fix circuit prediction logic so that a client doesn't treat a port
  10289. as being "handled" by a circuit if that circuit already has
  10290. isolation settings on it. This change should make Tor clients more
  10291. responsive by improving their chances of having a pre-created
  10292. circuit ready for use when a request arrives. Fixes bug 18859;
  10293. bugfix on 0.2.3.3-alpha.
  10294. o Major bugfixes (exit relays, DNS):
  10295. - Fix an issue causing DNS to fail on high-bandwidth exit nodes,
  10296. making them nearly unusable. Fixes bugs 21394 and 18580; bugfix on
  10297. 0.1.2.2-alpha, which introduced eventdns. Thanks to Dhalgren for
  10298. identifying and finding a workaround to this bug and to Moritz,
  10299. Arthur Edelstein, and Roger for helping to track it down and
  10300. analyze it.
  10301. o Major bugfixes (relay, crash, assertion failure):
  10302. - Fix a timing-based assertion failure that could occur when the
  10303. circuit out-of-memory handler freed a connection's output buffer.
  10304. Fixes bug 23690; bugfix on 0.2.6.1-alpha.
  10305. o Major bugfixes (usability, control port):
  10306. - Report trusted clock skew indications as bootstrap errors, so
  10307. controllers can more easily alert users when their clocks are
  10308. wrong. Fixes bug 23506; bugfix on 0.1.2.6-alpha.
  10309. o Minor features (bridge):
  10310. - Bridge relays can now set the BridgeDistribution config option to
  10311. add a "bridge-distribution-request" line to their bridge
  10312. descriptor, which tells BridgeDB how they'd like their bridge
  10313. address to be given out. (Note that as of Oct 2017, BridgeDB does
  10314. not yet implement this feature.) As a side benefit, this feature
  10315. provides a way to distinguish bridge descriptors from non-bridge
  10316. descriptors. Implements tickets 18329.
  10317. - When handling the USERADDR command on an ExtOrPort, warn when the
  10318. transports provides a USERADDR with no port. In a future version,
  10319. USERADDR commands of this format may be rejected. Detects problems
  10320. related to ticket 23080.
  10321. o Minor features (bug detection):
  10322. - Log a warning message with a stack trace for any attempt to call
  10323. get_options() during option validation. This pattern has caused
  10324. subtle bugs in the past. Closes ticket 22281.
  10325. o Minor features (build, compilation):
  10326. - The "check-changes" feature is now part of the "make check" tests;
  10327. we'll use it to try to prevent misformed changes files from
  10328. accumulating. Closes ticket 23564.
  10329. - Tor builds should now fail if there are any mismatches between the
  10330. C type representing a configuration variable and the C type the
  10331. data-driven parser uses to store a value there. Previously, we
  10332. needed to check these by hand, which sometimes led to mistakes.
  10333. Closes ticket 23643.
  10334. o Minor features (client):
  10335. - You can now use Tor as a tunneled HTTP proxy: use the new
  10336. HTTPTunnelPort option to open a port that accepts HTTP CONNECT
  10337. requests. Closes ticket 22407.
  10338. - Add an extra check to make sure that we always use the newer guard
  10339. selection code for picking our guards. Closes ticket 22779.
  10340. - When downloading (micro)descriptors, don't split the list into
  10341. multiple requests unless we want at least 32 descriptors.
  10342. Previously, we split at 4, not 32, which led to significant
  10343. overhead in HTTP request size and degradation in compression
  10344. performance. Closes ticket 23220.
  10345. - Improve log messages when missing descriptors for primary guards.
  10346. Resolves ticket 23670.
  10347. o Minor features (command line):
  10348. - Add a new commandline option, --key-expiration, which prints when
  10349. the current signing key is going to expire. Implements ticket
  10350. 17639; patch by Isis Lovecruft.
  10351. o Minor features (control port):
  10352. - If an application tries to use the control port as an HTTP proxy,
  10353. respond with a meaningful "This is the Tor control port" message,
  10354. and log the event. Closes ticket 1667. Patch from Ravi
  10355. Chandra Padmala.
  10356. - Provide better error message for GETINFO desc/(id|name) when not
  10357. fetching router descriptors. Closes ticket 5847. Patch by
  10358. Kevin Butler.
  10359. - Add GETINFO "{desc,md}/download-enabled", to inform the controller
  10360. whether Tor will try to download router descriptors and
  10361. microdescriptors respectively. Closes ticket 22684.
  10362. - Added new GETINFO targets "ip-to-country/{ipv4,ipv6}-available",
  10363. so controllers can tell whether the geoip databases are loaded.
  10364. Closes ticket 23237.
  10365. - Adds a timestamp field to the CIRC_BW and STREAM_BW bandwidth
  10366. events. Closes ticket 19254. Patch by "DonnchaC".
  10367. o Minor features (development support):
  10368. - Developers can now generate a call-graph for Tor using the
  10369. "calltool" python program, which post-processes object dumps. It
  10370. should work okay on many Linux and OSX platforms, and might work
  10371. elsewhere too. To run it, install calltool from
  10372. https://gitweb.torproject.org/user/nickm/calltool.git and run
  10373. "make callgraph". Closes ticket 19307.
  10374. o Minor features (directory authority):
  10375. - Make the "Exit" flag assignment only depend on whether the exit
  10376. policy allows connections to ports 80 and 443. Previously relays
  10377. would get the Exit flag if they allowed connections to one of
  10378. these ports and also port 6667. Resolves ticket 23637.
  10379. o Minor features (ed25519):
  10380. - Add validation function to checks for torsion components in
  10381. ed25519 public keys, used by prop224 client-side code. Closes
  10382. ticket 22006. Math help by Ian Goldberg.
  10383. o Minor features (exit relay, DNS):
  10384. - Improve the clarity and safety of the log message from evdns when
  10385. receiving an apparently spoofed DNS reply. Closes ticket 3056.
  10386. o Minor features (fallback directory mirrors):
  10387. - The fallback directory list has been re-generated based on the
  10388. current status of the network. Tor uses fallback directories to
  10389. bootstrap when it doesn't yet have up-to-date directory
  10390. information. Closes ticket 24801.
  10391. - Make the default DirAuthorityFallbackRate 0.1, so that clients
  10392. prefer to bootstrap from fallback directory mirrors. This is a
  10393. follow-up to 24679, which removed weights from the default
  10394. fallbacks. Implements ticket 24681.
  10395. o Minor features (geoip):
  10396. - Update geoip and geoip6 to the January 5 2018 Maxmind GeoLite2
  10397. Country database.
  10398. o Minor features (integration, hardening):
  10399. - Add a new NoExec option to prevent Tor from running other
  10400. programs. When this option is set to 1, Tor will never try to run
  10401. another program, regardless of the settings of
  10402. PortForwardingHelper, ClientTransportPlugin, or
  10403. ServerTransportPlugin. Once NoExec is set, it cannot be disabled
  10404. without restarting Tor. Closes ticket 22976.
  10405. o Minor features (linux seccomp2 sandbox):
  10406. - Update the sandbox rules so that they should now work correctly
  10407. with Glibc 2.26. Closes ticket 24315.
  10408. o Minor features (logging):
  10409. - Provide better warnings when the getrandom() syscall fails. Closes
  10410. ticket 24500.
  10411. - Downgrade a pair of log messages that could occur when an exit's
  10412. resolver gave us an unusual (but not forbidden) response. Closes
  10413. ticket 24097.
  10414. - Improve the message we log when re-enabling circuit build timeouts
  10415. after having received a consensus. Closes ticket 20963.
  10416. - Log more circuit information whenever we are about to try to
  10417. package a relay cell on a circuit with a nonexistent n_chan.
  10418. Attempt to diagnose ticket 8185.
  10419. - Improve info-level log identification of particular circuits, to
  10420. help with debugging. Closes ticket 23645.
  10421. - Improve the warning message for specifying a relay by nickname.
  10422. The previous message implied that nickname registration was still
  10423. part of the Tor network design, which it isn't. Closes
  10424. ticket 20488.
  10425. - If the sandbox filter fails to load, suggest to the user that
  10426. their kernel might not support seccomp2. Closes ticket 23090.
  10427. o Minor features (onion service, circuit, logging):
  10428. - Improve logging of many callsite in the circuit subsystem to print
  10429. the circuit identifier(s).
  10430. - Log when we cleanup an intro point from a service so we know when
  10431. and for what reason it happened. Closes ticket 23604.
  10432. o Minor features (portability):
  10433. - Tor now compiles correctly on arm64 with libseccomp-dev installed.
  10434. (It doesn't yet work with the sandbox enabled.) Closes
  10435. ticket 24424.
  10436. - Check at configure time whether uint8_t is the same type as
  10437. unsigned char. Lots of existing code already makes this
  10438. assumption, and there could be strict aliasing issues if the
  10439. assumption is violated. Closes ticket 22410.
  10440. o Minor features (relay):
  10441. - When choosing which circuits can be expired as unused, consider
  10442. circuits from clients even if those clients used regular CREATE
  10443. cells to make them; and do not consider circuits from relays even
  10444. if they were made with CREATE_FAST. Part of ticket 22805.
  10445. - Reject attempts to use relative file paths when RunAsDaemon is
  10446. set. Previously, Tor would accept these, but the directory-
  10447. changing step of RunAsDaemon would give strange and/or confusing
  10448. results. Closes ticket 22731.
  10449. o Minor features (relay statistics):
  10450. - Change relay bandwidth reporting stats interval from 4 hours to 24
  10451. hours in order to reduce the efficiency of guard discovery
  10452. attacks. Fixes ticket 23856.
  10453. o Minor features (reverted deprecations):
  10454. - The ClientDNSRejectInternalAddresses flag can once again be set in
  10455. non-testing Tor networks, so long as they do not use the default
  10456. directory authorities. This change also removes the deprecation of
  10457. this flag from 0.2.9.2-alpha. Closes ticket 21031.
  10458. o Minor features (robustness):
  10459. - Change several fatal assertions when flushing buffers into non-
  10460. fatal assertions, to prevent any recurrence of 23690.
  10461. o Minor features (startup, safety):
  10462. - When configured to write a PID file, Tor now exits if it is unable
  10463. to do so. Previously, it would warn and continue. Closes
  10464. ticket 20119.
  10465. o Minor features (static analysis):
  10466. - The BUG() macro has been changed slightly so that Coverity no
  10467. longer complains about dead code if the bug is impossible. Closes
  10468. ticket 23054.
  10469. o Minor features (testing):
  10470. - Our fuzzing tests now test the encrypted portions of v3 onion
  10471. service descriptors. Implements more of 21509.
  10472. - Add a unit test to make sure that our own generated platform
  10473. string will be accepted by directory authorities. Closes
  10474. ticket 22109.
  10475. - The default chutney network tests now include tests for the v3
  10476. onion service design. Make sure you have the latest version of
  10477. chutney if you want to run these. Closes ticket 22437.
  10478. - Add a unit test to verify that we can parse a hardcoded v2 onion
  10479. service descriptor. Closes ticket 15554.
  10480. o Minor bugfixes (address selection):
  10481. - When the fascist_firewall_choose_address_ functions don't find a
  10482. reachable address, set the returned address to the null address
  10483. and port. This is a precautionary measure, because some callers do
  10484. not check the return value. Fixes bug 24736; bugfix
  10485. on 0.2.8.2-alpha.
  10486. o Minor bugfixes (bootstrapping):
  10487. - When warning about state file clock skew, report the correct
  10488. direction for the detected skew. Fixes bug 23606; bugfix
  10489. on 0.2.8.1-alpha.
  10490. o Minor bugfixes (bridge clients, bootstrap):
  10491. - Retry directory downloads when we get our first bridge descriptor
  10492. during bootstrap or while reconnecting to the network. Keep
  10493. retrying every time we get a bridge descriptor, until we have a
  10494. reachable bridge. Fixes part of bug 24367; bugfix on 0.2.0.3-alpha.
  10495. - Stop delaying bridge descriptor fetches when we have cached bridge
  10496. descriptors. Instead, only delay bridge descriptor fetches when we
  10497. have at least one reachable bridge. Fixes part of bug 24367;
  10498. bugfix on 0.2.0.3-alpha.
  10499. - Stop delaying directory fetches when we have cached bridge
  10500. descriptors. Instead, only delay bridge descriptor fetches when
  10501. all our bridges are definitely unreachable. Fixes part of bug
  10502. 24367; bugfix on 0.2.0.3-alpha.
  10503. o Minor bugfixes (bridge):
  10504. - Overwrite the bridge address earlier in the process of retrieving
  10505. its descriptor, to make sure we reach it on the configured
  10506. address. Fixes bug 20532; bugfix on 0.2.0.10-alpha.
  10507. o Minor bugfixes (build, compilation):
  10508. - Fix a compilation warning when building with zstd support on
  10509. 32-bit platforms. Fixes bug 23568; bugfix on 0.3.1.1-alpha. Found
  10510. and fixed by Andreas Stieger.
  10511. - When searching for OpenSSL, don't accept any OpenSSL library that
  10512. lacks TLSv1_1_method(): Tor doesn't build with those versions.
  10513. Additionally, look in /usr/local/opt/openssl, if it's present.
  10514. These changes together repair the default build on OSX systems
  10515. with Homebrew installed. Fixes bug 23602; bugfix on 0.2.7.2-alpha.
  10516. - Fix a signed/unsigned comparison warning introduced by our fix to
  10517. TROVE-2017-009. Fixes bug 24480; bugfix on 0.2.5.16.
  10518. - Fix a memory leak warning in one of the libevent-related
  10519. configuration tests that could occur when manually specifying
  10520. -fsanitize=address. Fixes bug 24279; bugfix on 0.3.0.2-alpha.
  10521. Found and patched by Alex Xu.
  10522. - Fix unused-variable warnings in donna's Curve25519 SSE2 code.
  10523. Fixes bug 22895; bugfix on 0.2.7.2-alpha.
  10524. o Minor bugfixes (certificate handling):
  10525. - Fix a time handling bug in Tor certificates set to expire after
  10526. the year 2106. Fixes bug 23055; bugfix on 0.3.0.1-alpha. Found by
  10527. Coverity as CID 1415728.
  10528. o Minor bugfixes (client):
  10529. - By default, do not enable storage of client-side DNS values. These
  10530. values were unused by default previously, but they should not have
  10531. been cached at all. Fixes bug 24050; bugfix on 0.2.6.3-alpha.
  10532. o Minor bugfixes (client, usability):
  10533. - Refrain from needlessly rejecting SOCKS5-with-hostnames and
  10534. SOCKS4a requests that contain IP address strings, even when
  10535. SafeSocks in enabled, as this prevents user from connecting to
  10536. known IP addresses without relying on DNS for resolving. SafeSocks
  10537. still rejects SOCKS connections that connect to IP addresses when
  10538. those addresses are _not_ encoded as hostnames. Fixes bug 22461;
  10539. bugfix on Tor 0.2.6.2-alpha.
  10540. o Minor bugfixes (code correctness):
  10541. - Call htons() in extend_cell_format() for encoding a 16-bit value.
  10542. Previously we used ntohs(), which happens to behave the same on
  10543. all the platforms we support, but which isn't really correct.
  10544. Fixes bug 23106; bugfix on 0.2.4.8-alpha.
  10545. - For defense-in-depth, make the controller's write_escaped_data()
  10546. function robust to extremely long inputs. Fixes bug 19281; bugfix
  10547. on 0.1.1.1-alpha. Reported by Guido Vranken.
  10548. - Fix several places in our codebase where a C compiler would be
  10549. likely to eliminate a check, based on assuming that undefined
  10550. behavior had not happened elsewhere in the code. These cases are
  10551. usually a sign of redundant checking or dubious arithmetic. Found
  10552. by Georg Koppen using the "STACK" tool from Wang, Zeldovich,
  10553. Kaashoek, and Solar-Lezama. Fixes bug 24423; bugfix on various
  10554. Tor versions.
  10555. o Minor bugfixes (compression):
  10556. - Handle a pathological case when decompressing Zstandard data when
  10557. the output buffer size is zero. Fixes bug 23551; bugfix
  10558. on 0.3.1.1-alpha.
  10559. o Minor bugfixes (consensus expiry):
  10560. - Check for adequate directory information correctly. Previously, Tor
  10561. would reconsider whether it had sufficient directory information
  10562. every 2 minutes. Fixes bug 23091; bugfix on 0.2.0.19-alpha.
  10563. o Minor bugfixes (control port, linux seccomp2 sandbox):
  10564. - Avoid a crash when attempting to use the seccomp2 sandbox together
  10565. with the OwningControllerProcess feature. Fixes bug 24198; bugfix
  10566. on 0.2.5.1-alpha.
  10567. o Minor bugfixes (control port, onion services):
  10568. - Report "FAILED" instead of "UPLOAD_FAILED" "FAILED" for the
  10569. HS_DESC event when a service is not able to upload a descriptor.
  10570. Fixes bug 24230; bugfix on 0.2.7.1-alpha.
  10571. o Minor bugfixes (directory cache):
  10572. - Recover better from empty or corrupt files in the consensus cache
  10573. directory. Fixes bug 24099; bugfix on 0.3.1.1-alpha.
  10574. - When a consensus diff calculation is only partially successful,
  10575. only record the successful parts as having succeeded. Partial
  10576. success can happen if (for example) one compression method fails
  10577. but the others succeed. Previously we misrecorded all the
  10578. calculations as having succeeded, which would later cause a
  10579. nonfatal assertion failure. Fixes bug 24086; bugfix
  10580. on 0.3.1.1-alpha.
  10581. o Minor bugfixes (directory client):
  10582. - On failure to download directory information, delay retry attempts
  10583. by a random amount based on the "decorrelated jitter" algorithm.
  10584. Our previous delay algorithm tended to produce extra-long delays
  10585. too easily. Fixes bug 23816; bugfix on 0.2.9.1-alpha.
  10586. o Minor bugfixes (directory protocol):
  10587. - Directory servers now include a "Date:" http header for response
  10588. codes other than 200. Clients starting with a skewed clock and a
  10589. recent consensus were getting "304 Not modified" responses from
  10590. directory authorities, so without the Date header, the client
  10591. would never hear about a wrong clock. Fixes bug 23499; bugfix
  10592. on 0.0.8rc1.
  10593. - Make clients wait for 6 seconds before trying to download a
  10594. consensus from an authority. Fixes bug 17750; bugfix
  10595. on 0.2.8.1-alpha.
  10596. o Minor bugfixes (documentation):
  10597. - Document better how to read gcov, and what our gcov postprocessing
  10598. scripts do. Fixes bug 23739; bugfix on 0.2.9.1-alpha.
  10599. - Fix manpage to not refer to the obsolete (and misspelled)
  10600. UseEntryGuardsAsDirectoryGuards parameter in the description of
  10601. NumDirectoryGuards. Fixes bug 23611; bugfix on 0.2.4.8-alpha.
  10602. o Minor bugfixes (DoS-resistance):
  10603. - If future code asks if there are any running bridges, without
  10604. checking if bridges are enabled, log a BUG warning rather than
  10605. crashing. Fixes bug 23524; bugfix on 0.3.0.1-alpha.
  10606. o Minor bugfixes (entry guards):
  10607. - Tor now updates its guard state when it reads a consensus
  10608. regardless of whether it's missing descriptors. That makes tor use
  10609. its primary guards to fetch descriptors in some edge cases where
  10610. it would previously have used fallback directories. Fixes bug
  10611. 23862; bugfix on 0.3.0.1-alpha.
  10612. o Minor bugfixes (format strictness):
  10613. - Restrict several data formats to decimal. Previously, the
  10614. BuildTimeHistogram entries in the state file, the "bw=" entries in
  10615. the bandwidth authority file, and the process IDs passed to the
  10616. __OwningControllerProcess option could all be specified in hex or
  10617. octal as well as in decimal. This was not an intentional feature.
  10618. Fixes bug 22802; bugfixes on 0.2.2.1-alpha, 0.2.2.2-alpha,
  10619. and 0.2.2.28-beta.
  10620. o Minor bugfixes (heartbeat):
  10621. - If we fail to write a heartbeat message, schedule a retry for the
  10622. minimum heartbeat interval number of seconds in the future. Fixes
  10623. bug 19476; bugfix on 0.2.3.1-alpha.
  10624. o Minor bugfixes (logging):
  10625. - Suppress a log notice when relay descriptors arrive. We already
  10626. have a bootstrap progress for this so no need to log notice
  10627. everytime tor receives relay descriptors. Microdescriptors behave
  10628. the same. Fixes bug 23861; bugfix on 0.2.8.2-alpha.
  10629. - Remove duplicate log messages regarding opening non-local
  10630. SocksPorts upon parsing config and opening listeners at startup.
  10631. Fixes bug 4019; bugfix on 0.2.3.3-alpha.
  10632. - Use a more comprehensible log message when telling the user
  10633. they've excluded every running exit node. Fixes bug 7890; bugfix
  10634. on 0.2.2.25-alpha.
  10635. - When logging the number of descriptors we intend to download per
  10636. directory request, do not log a number higher than then the number
  10637. of descriptors we're fetching in total. Fixes bug 19648; bugfix
  10638. on 0.1.1.8-alpha.
  10639. - When warning about a directory owned by the wrong user, log the
  10640. actual name of the user owning the directory. Previously, we'd log
  10641. the name of the process owner twice. Fixes bug 23487; bugfix
  10642. on 0.2.9.1-alpha.
  10643. - Fix some messages on unexpected errors from the seccomp2 library.
  10644. Fixes bug 22750; bugfix on 0.2.5.1-alpha. Patch from "cypherpunks".
  10645. - The tor specification says hop counts are 1-based, so fix two log
  10646. messages that mistakenly logged 0-based hop counts. Fixes bug
  10647. 18982; bugfix on 0.2.6.2-alpha and 0.2.4.5-alpha. Patch by teor.
  10648. Credit to Xiaofan Li for reporting this issue.
  10649. o Minor bugfixes (logging, relay shutdown, annoyance):
  10650. - When a circuit is marked for close, do not attempt to package any
  10651. cells for channels on that circuit. Previously, we would detect
  10652. this condition lower in the call stack, when we noticed that the
  10653. circuit had no attached channel, and log an annoying message.
  10654. Fixes bug 8185; bugfix on 0.2.5.4-alpha.
  10655. o Minor bugfixes (memory safety, defensive programming):
  10656. - Clear the target address when node_get_prim_orport() returns
  10657. early. Fixes bug 23874; bugfix on 0.2.8.2-alpha.
  10658. o Minor bugfixes (memory usage):
  10659. - When queuing DESTROY cells on a channel, only queue the circuit-id
  10660. and reason fields: not the entire 514-byte cell. This fix should
  10661. help mitigate any bugs or attacks that fill up these queues, and
  10662. free more RAM for other uses. Fixes bug 24666; bugfix
  10663. on 0.2.5.1-alpha.
  10664. o Minor bugfixes (network layer):
  10665. - When closing a connection via close_connection_immediately(), we
  10666. mark it as "not blocked on bandwidth", to prevent later calls from
  10667. trying to unblock it, and give it permission to read. This fixes a
  10668. backtrace warning that can happen on relays under various
  10669. circumstances. Fixes bug 24167; bugfix on 0.1.0.1-rc.
  10670. o Minor bugfixes (onion services):
  10671. - The introduction circuit was being timed out too quickly while
  10672. waiting for the rendezvous circuit to complete. Keep the intro
  10673. circuit around longer instead of timing out and reopening new ones
  10674. constantly. Fixes bug 23681; bugfix on 0.2.4.8-alpha.
  10675. - Rename the consensus parameter "hsdir-interval" to "hsdir_interval"
  10676. so it matches dir-spec.txt. Fixes bug 24262; bugfix
  10677. on 0.3.1.1-alpha.
  10678. - When handling multiple SOCKS request for the same .onion address,
  10679. only fetch the service descriptor once.
  10680. - Avoid a possible double close of a circuit by the intro point on
  10681. error of sending the INTRO_ESTABLISHED cell. Fixes bug 23610;
  10682. bugfix on 0.3.0.1-alpha.
  10683. - When reloading configured onion services, copy all information
  10684. from the old service object. Previously, some data was omitted,
  10685. causing delays in descriptor upload, and other bugs. Fixes bug
  10686. 23790; bugfix on 0.2.1.9-alpha.
  10687. o Minor bugfixes (path selection):
  10688. - When selecting relays by bandwidth, avoid a rounding error that
  10689. could sometimes cause load to be imbalanced incorrectly.
  10690. Previously, we would always round upwards; now, we round towards
  10691. the nearest integer. This had the biggest effect when a relay's
  10692. weight adjustments should have given it weight 0, but it got
  10693. weight 1 instead. Fixes bug 23318; bugfix on 0.2.4.3-alpha.
  10694. - When calculating the fraction of nodes that have descriptors, and
  10695. all nodes in the network have zero bandwidths, count the number of
  10696. nodes instead. Fixes bug 23318; bugfix on 0.2.4.10-alpha.
  10697. - Actually log the total bandwidth in compute_weighted_bandwidths().
  10698. Fixes bug 24170; bugfix on 0.2.4.3-alpha.
  10699. o Minor bugfixes (portability):
  10700. - Stop using the PATH_MAX variable, which is not defined on GNU
  10701. Hurd. Fixes bug 23098; bugfix on 0.3.1.1-alpha.
  10702. - Fix a bug in the bit-counting parts of our timing-wheel code on
  10703. MSVC. (Note that MSVC is still not a supported build platform, due
  10704. to cryptographic timing channel risks.) Fixes bug 24633; bugfix
  10705. on 0.2.9.1-alpha.
  10706. o Minor bugfixes (relay):
  10707. - When uploading our descriptor for the first time after startup,
  10708. report the reason for uploading as "Tor just started" rather than
  10709. leaving it blank. Fixes bug 22885; bugfix on 0.2.3.4-alpha.
  10710. - Avoid unnecessary calls to directory_fetches_from_authorities() on
  10711. relays, to prevent spurious address resolutions and descriptor
  10712. rebuilds. This is a mitigation for bug 21789. Fixes bug 23470;
  10713. bugfix on in 0.2.8.1-alpha.
  10714. - Avoid a crash when transitioning from client mode to bridge mode.
  10715. Previously, we would launch the worker threads whenever our
  10716. "public server" mode changed, but not when our "server" mode
  10717. changed. Fixes bug 23693; bugfix on 0.2.6.3-alpha.
  10718. o Minor bugfixes (testing):
  10719. - Fix a spurious fuzzing-only use of an uninitialized value. Found
  10720. by Brian Carpenter. Fixes bug 24082; bugfix on 0.3.0.3-alpha.
  10721. - Test that IPv6-only clients can use microdescriptors when running
  10722. "make test-network-all". Requires chutney master 61c28b9 or later.
  10723. Closes ticket 24109.
  10724. - Prevent scripts/test/coverage from attempting to move gcov output
  10725. to the root directory. Fixes bug 23741; bugfix on 0.2.5.1-alpha.
  10726. - Capture and detect several "Result does not fit" warnings in unit
  10727. tests on platforms with 32-bit time_t. Fixes bug 21800; bugfix
  10728. on 0.2.9.3-alpha.
  10729. - Fix additional channelpadding unit test failures by using mocked
  10730. time instead of actual time for all tests. Fixes bug 23608; bugfix
  10731. on 0.3.1.1-alpha.
  10732. - Fix a bug in our fuzzing mock replacement for crypto_pk_checksig(),
  10733. to correctly handle cases where a caller gives it an RSA key of
  10734. under 160 bits. (This is not actually a bug in Tor itself, but
  10735. rather in our fuzzing code.) Fixes bug 24247; bugfix on
  10736. 0.3.0.3-alpha. Found by OSS-Fuzz as issue 4177.
  10737. - Fix a broken unit test for the OutboundAddress option: the parsing
  10738. function was never returning an error on failure. Fixes bug 23366;
  10739. bugfix on 0.3.0.3-alpha.
  10740. - Fix a signed-integer overflow in the unit tests for
  10741. dir/download_status_random_backoff, which was untriggered until we
  10742. fixed bug 17750. Fixes bug 22924; bugfix on 0.2.9.1-alpha.
  10743. o Minor bugfixes (usability, control port):
  10744. - Stop making an unnecessary routerlist check in NETINFO clock skew
  10745. detection; this was preventing clients from reporting NETINFO clock
  10746. skew to controllers. Fixes bug 23532; bugfix on 0.2.4.4-alpha.
  10747. o Code simplification and refactoring:
  10748. - Remove various ways of testing circuits and connections for
  10749. "clientness"; instead, favor channel_is_client(). Part of
  10750. ticket 22805.
  10751. - Extract the code for handling newly-open channels into a separate
  10752. function from the general code to handle channel state
  10753. transitions. This change simplifies our callgraph, reducing the
  10754. size of the largest strongly connected component by roughly a
  10755. factor of two. Closes ticket 22608.
  10756. - Remove dead code for largely unused statistics on the number of
  10757. times we've attempted various public key operations. Fixes bug
  10758. 19871; bugfix on 0.1.2.4-alpha. Fix by Isis Lovecruft.
  10759. - Remove several now-obsolete functions for asking about old
  10760. variants directory authority status. Closes ticket 22311; patch
  10761. from "huyvq".
  10762. - Remove some of the code that once supported "Named" and "Unnamed"
  10763. routers. Authorities no longer vote for these flags. Closes
  10764. ticket 22215.
  10765. - Rename the obsolete malleable hybrid_encrypt functions used in TAP
  10766. and old hidden services, to indicate that they aren't suitable for
  10767. new protocols or formats. Closes ticket 23026.
  10768. - Replace our STRUCT_OFFSET() macro with offsetof(). Closes ticket
  10769. 22521. Patch from Neel Chauhan.
  10770. - Split the enormous circuit_send_next_onion_skin() function into
  10771. multiple subfunctions. Closes ticket 22804.
  10772. - Split the portions of the buffer.c module that handle particular
  10773. protocols into separate modules. Part of ticket 23149.
  10774. - Use our test macros more consistently, to produce more useful
  10775. error messages when our unit tests fail. Add coccinelle patches to
  10776. allow us to re-check for test macro uses. Closes ticket 22497.
  10777. o Deprecated features:
  10778. - The ReachableDirAddresses and ClientPreferIPv6DirPort options are
  10779. now deprecated; they do not apply to relays, and they have had no
  10780. effect on clients since 0.2.8.x. Closes ticket 19704.
  10781. - Deprecate HTTPProxy/HTTPProxyAuthenticator config options. They
  10782. only applies to direct unencrypted HTTP connections to your
  10783. directory server, which your Tor probably isn't using. Closes
  10784. ticket 20575.
  10785. o Documentation:
  10786. - Add notes in man page regarding OS support for the various
  10787. scheduler types. Attempt to use less jargon in the scheduler
  10788. section. Closes ticket 24254.
  10789. - Clarify that the Address option is entirely about setting an
  10790. advertised IPv4 address. Closes ticket 18891.
  10791. - Clarify the manpage's use of the term "address" to clarify what
  10792. kind of address is intended. Closes ticket 21405.
  10793. - Document that onion service subdomains are allowed, and ignored.
  10794. Closes ticket 18736.
  10795. - Clarify in the manual that "Sandbox 1" is only supported on Linux
  10796. kernels. Closes ticket 22677.
  10797. - Document all values of PublishServerDescriptor in the manpage.
  10798. Closes ticket 15645.
  10799. - Improve the documentation for the directory port part of the
  10800. DirAuthority line. Closes ticket 20152.
  10801. - Restore documentation for the authorities' "approved-routers"
  10802. file. Closes ticket 21148.
  10803. o Removed features:
  10804. - The AllowDotExit option has been removed as unsafe. It has been
  10805. deprecated since 0.2.9.2-alpha. Closes ticket 23426.
  10806. - The ClientDNSRejectInternalAddresses flag can no longer be set on
  10807. non-testing networks. It has been deprecated since 0.2.9.2-alpha.
  10808. Closes ticket 21031.
  10809. - The controller API no longer includes an AUTHDIR_NEWDESCS event:
  10810. nobody was using it any longer. Closes ticket 22377.
  10811. Changes in version 0.3.1.9 - 2017-12-01:
  10812. Tor 0.3.1.9 backports important security and stability fixes from the
  10813. 0.3.2 development series. All Tor users should upgrade to this
  10814. release, or to another of the releases coming out today.
  10815. o Major bugfixes (security, backport from 0.3.2.6-alpha):
  10816. - Fix a denial of service bug where an attacker could use a
  10817. malformed directory object to cause a Tor instance to pause while
  10818. OpenSSL would try to read a passphrase from the terminal. (Tor
  10819. instances run without a terminal, which is the case for most Tor
  10820. packages, are not impacted.) Fixes bug 24246; bugfix on every
  10821. version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
  10822. Found by OSS-Fuzz as testcase 6360145429790720.
  10823. - Fix a denial of service issue where an attacker could crash a
  10824. directory authority using a malformed router descriptor. Fixes bug
  10825. 24245; bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2017-010
  10826. and CVE-2017-8820.
  10827. - When checking for replays in the INTRODUCE1 cell data for a
  10828. (legacy) onion service, correctly detect replays in the RSA-
  10829. encrypted part of the cell. We were previously checking for
  10830. replays on the entire cell, but those can be circumvented due to
  10831. the malleability of Tor's legacy hybrid encryption. This fix helps
  10832. prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
  10833. 0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
  10834. and CVE-2017-8819.
  10835. o Major bugfixes (security, onion service v2, backport from 0.3.2.6-alpha):
  10836. - Fix a use-after-free error that could crash v2 Tor onion services
  10837. when they failed to open circuits while expiring introduction
  10838. points. Fixes bug 24313; bugfix on 0.2.7.2-alpha. This issue is
  10839. also tracked as TROVE-2017-013 and CVE-2017-8823.
  10840. o Major bugfixes (security, relay, backport from 0.3.2.6-alpha):
  10841. - When running as a relay, make sure that we never build a path
  10842. through ourselves, even in the case where we have somehow lost the
  10843. version of our descriptor appearing in the consensus. Fixes part
  10844. of bug 21534; bugfix on 0.2.0.1-alpha. This issue is also tracked
  10845. as TROVE-2017-012 and CVE-2017-8822.
  10846. - When running as a relay, make sure that we never choose ourselves
  10847. as a guard. Fixes part of bug 21534; bugfix on 0.3.0.1-alpha. This
  10848. issue is also tracked as TROVE-2017-012 and CVE-2017-8822.
  10849. o Major bugfixes (exit relays, DNS, backport from 0.3.2.4-alpha):
  10850. - Fix an issue causing DNS to fail on high-bandwidth exit nodes,
  10851. making them nearly unusable. Fixes bugs 21394 and 18580; bugfix on
  10852. 0.1.2.2-alpha, which introduced eventdns. Thanks to Dhalgren for
  10853. identifying and finding a workaround to this bug and to Moritz,
  10854. Arthur Edelstein, and Roger for helping to track it down and
  10855. analyze it.
  10856. o Minor features (bridge):
  10857. - Bridges now include notice in their descriptors that they are
  10858. bridges, and notice of their distribution status, based on their
  10859. publication settings. Implements ticket 18329. For more fine-
  10860. grained control of how a bridge is distributed, upgrade to 0.3.2.x
  10861. or later.
  10862. o Minor features (directory authority, backport from 0.3.2.6-alpha):
  10863. - Add an IPv6 address for the "bastet" directory authority. Closes
  10864. ticket 24394.
  10865. o Minor features (geoip):
  10866. - Update geoip and geoip6 to the November 6 2017 Maxmind GeoLite2
  10867. Country database.
  10868. o Minor bugfix (relay address resolution, backport from 0.3.2.1-alpha):
  10869. - Avoid unnecessary calls to directory_fetches_from_authorities() on
  10870. relays, to prevent spurious address resolutions and descriptor
  10871. rebuilds. This is a mitigation for bug 21789. Fixes bug 23470;
  10872. bugfix on in 0.2.8.1-alpha.
  10873. o Minor bugfixes (compilation, backport from 0.3.2.1-alpha):
  10874. - Fix unused variable warnings in donna's Curve25519 SSE2 code.
  10875. Fixes bug 22895; bugfix on 0.2.7.2-alpha.
  10876. o Minor bugfixes (logging, relay shutdown, annoyance, backport from 0.3.2.2-alpha):
  10877. - When a circuit is marked for close, do not attempt to package any
  10878. cells for channels on that circuit. Previously, we would detect
  10879. this condition lower in the call stack, when we noticed that the
  10880. circuit had no attached channel, and log an annoying message.
  10881. Fixes bug 8185; bugfix on 0.2.5.4-alpha.
  10882. o Minor bugfixes (onion service, backport from 0.3.2.5-alpha):
  10883. - Rename the consensus parameter "hsdir-interval" to "hsdir_interval"
  10884. so it matches dir-spec.txt. Fixes bug 24262; bugfix
  10885. on 0.3.1.1-alpha.
  10886. o Minor bugfixes (relay, crash, backport from 0.3.2.4-alpha):
  10887. - Avoid a crash when transitioning from client mode to bridge mode.
  10888. Previously, we would launch the worker threads whenever our
  10889. "public server" mode changed, but not when our "server" mode
  10890. changed. Fixes bug 23693; bugfix on 0.2.6.3-alpha.
  10891. Changes in version 0.3.0.13 - 2017-12-01
  10892. Tor 0.3.0.13 backports important security and stability bugfixes from
  10893. later Tor releases. All Tor users should upgrade to this release, or
  10894. to another of the releases coming out today.
  10895. Note: the Tor 0.3.0 series will no longer be supported after 26 Jan
  10896. 2018. If you need a release with long-term support, please stick with
  10897. the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
  10898. o Major bugfixes (security, backport from 0.3.2.6-alpha):
  10899. - Fix a denial of service bug where an attacker could use a
  10900. malformed directory object to cause a Tor instance to pause while
  10901. OpenSSL would try to read a passphrase from the terminal. (Tor
  10902. instances run without a terminal, which is the case for most Tor
  10903. packages, are not impacted.) Fixes bug 24246; bugfix on every
  10904. version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
  10905. Found by OSS-Fuzz as testcase 6360145429790720.
  10906. - Fix a denial of service issue where an attacker could crash a
  10907. directory authority using a malformed router descriptor. Fixes bug
  10908. 24245; bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2017-010
  10909. and CVE-2017-8820.
  10910. - When checking for replays in the INTRODUCE1 cell data for a
  10911. (legacy) onion service, correctly detect replays in the RSA-
  10912. encrypted part of the cell. We were previously checking for
  10913. replays on the entire cell, but those can be circumvented due to
  10914. the malleability of Tor's legacy hybrid encryption. This fix helps
  10915. prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
  10916. 0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
  10917. and CVE-2017-8819.
  10918. o Major bugfixes (security, onion service v2, backport from 0.3.2.6-alpha):
  10919. - Fix a use-after-free error that could crash v2 Tor onion services
  10920. when they failed to open circuits while expiring introduction
  10921. points. Fixes bug 24313; bugfix on 0.2.7.2-alpha. This issue is
  10922. also tracked as TROVE-2017-013 and CVE-2017-8823.
  10923. o Major bugfixes (security, relay, backport from 0.3.2.6-alpha):
  10924. - When running as a relay, make sure that we never build a path
  10925. through ourselves, even in the case where we have somehow lost the
  10926. version of our descriptor appearing in the consensus. Fixes part
  10927. of bug 21534; bugfix on 0.2.0.1-alpha. This issue is also tracked
  10928. as TROVE-2017-012 and CVE-2017-8822.
  10929. - When running as a relay, make sure that we never choose ourselves
  10930. as a guard. Fixes part of bug 21534; bugfix on 0.3.0.1-alpha. This
  10931. issue is also tracked as TROVE-2017-012 and CVE-2017-8822.
  10932. o Major bugfixes (exit relays, DNS, backport from 0.3.2.4-alpha):
  10933. - Fix an issue causing DNS to fail on high-bandwidth exit nodes,
  10934. making them nearly unusable. Fixes bugs 21394 and 18580; bugfix on
  10935. 0.1.2.2-alpha, which introduced eventdns. Thanks to Dhalgren for
  10936. identifying and finding a workaround to this bug and to Moritz,
  10937. Arthur Edelstein, and Roger for helping to track it down and
  10938. analyze it.
  10939. o Minor features (security, windows, backport from 0.3.1.1-alpha):
  10940. - Enable a couple of pieces of Windows hardening: one
  10941. (HeapEnableTerminationOnCorruption) that has been on-by-default
  10942. since Windows 8, and unavailable before Windows 7; and one
  10943. (PROCESS_DEP_DISABLE_ATL_THUNK_EMULATION) which we believe doesn't
  10944. affect us, but shouldn't do any harm. Closes ticket 21953.
  10945. o Minor features (bridge, backport from 0.3.1.9):
  10946. - Bridges now include notice in their descriptors that they are
  10947. bridges, and notice of their distribution status, based on their
  10948. publication settings. Implements ticket 18329. For more fine-
  10949. grained control of how a bridge is distributed, upgrade to 0.3.2.x
  10950. or later.
  10951. o Minor features (directory authority, backport from 0.3.2.6-alpha):
  10952. - Add an IPv6 address for the "bastet" directory authority. Closes
  10953. ticket 24394.
  10954. o Minor features (geoip):
  10955. - Update geoip and geoip6 to the November 6 2017 Maxmind GeoLite2
  10956. Country database.
  10957. o Minor bugfix (relay address resolution, backport from 0.3.2.1-alpha):
  10958. - Avoid unnecessary calls to directory_fetches_from_authorities() on
  10959. relays, to prevent spurious address resolutions and descriptor
  10960. rebuilds. This is a mitigation for bug 21789. Fixes bug 23470;
  10961. bugfix on in 0.2.8.1-alpha.
  10962. o Minor bugfixes (compilation, backport from 0.3.2.1-alpha):
  10963. - Fix unused variable warnings in donna's Curve25519 SSE2 code.
  10964. Fixes bug 22895; bugfix on 0.2.7.2-alpha.
  10965. o Minor bugfixes (logging, relay shutdown, annoyance, backport from 0.3.2.2-alpha):
  10966. - When a circuit is marked for close, do not attempt to package any
  10967. cells for channels on that circuit. Previously, we would detect
  10968. this condition lower in the call stack, when we noticed that the
  10969. circuit had no attached channel, and log an annoying message.
  10970. Fixes bug 8185; bugfix on 0.2.5.4-alpha.
  10971. o Minor bugfixes (relay, crash, backport from 0.3.2.4-alpha):
  10972. - Avoid a crash when transitioning from client mode to bridge mode.
  10973. Previously, we would launch the worker threads whenever our
  10974. "public server" mode changed, but not when our "server" mode
  10975. changed. Fixes bug 23693; bugfix on 0.2.6.3-alpha.
  10976. o Minor bugfixes (testing, backport from 0.3.1.6-rc):
  10977. - Fix an undersized buffer in test-memwipe.c. Fixes bug 23291;
  10978. bugfix on 0.2.7.2-alpha. Found and patched by Ties Stuij.
  10979. Changes in version 0.2.9.14 - 2017-12-01
  10980. Tor 0.3.0.13 backports important security and stability bugfixes from
  10981. later Tor releases. All Tor users should upgrade to this release, or
  10982. to another of the releases coming out today.
  10983. o Major bugfixes (exit relays, DNS, backport from 0.3.2.4-alpha):
  10984. - Fix an issue causing DNS to fail on high-bandwidth exit nodes,
  10985. making them nearly unusable. Fixes bugs 21394 and 18580; bugfix on
  10986. 0.1.2.2-alpha, which introduced eventdns. Thanks to Dhalgren for
  10987. identifying and finding a workaround to this bug and to Moritz,
  10988. Arthur Edelstein, and Roger for helping to track it down and
  10989. analyze it.
  10990. o Major bugfixes (security, backport from 0.3.2.6-alpha):
  10991. - Fix a denial of service bug where an attacker could use a
  10992. malformed directory object to cause a Tor instance to pause while
  10993. OpenSSL would try to read a passphrase from the terminal. (Tor
  10994. instances run without a terminal, which is the case for most Tor
  10995. packages, are not impacted.) Fixes bug 24246; bugfix on every
  10996. version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
  10997. Found by OSS-Fuzz as testcase 6360145429790720.
  10998. - Fix a denial of service issue where an attacker could crash a
  10999. directory authority using a malformed router descriptor. Fixes bug
  11000. 24245; bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2017-010
  11001. and CVE-2017-8820.
  11002. - When checking for replays in the INTRODUCE1 cell data for a
  11003. (legacy) onion service, correctly detect replays in the RSA-
  11004. encrypted part of the cell. We were previously checking for
  11005. replays on the entire cell, but those can be circumvented due to
  11006. the malleability of Tor's legacy hybrid encryption. This fix helps
  11007. prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
  11008. 0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
  11009. and CVE-2017-8819.
  11010. o Major bugfixes (security, onion service v2, backport from 0.3.2.6-alpha):
  11011. - Fix a use-after-free error that could crash v2 Tor onion services
  11012. when they failed to open circuits while expiring introduction
  11013. points. Fixes bug 24313; bugfix on 0.2.7.2-alpha. This issue is
  11014. also tracked as TROVE-2017-013 and CVE-2017-8823.
  11015. o Major bugfixes (security, relay, backport from 0.3.2.6-alpha):
  11016. - When running as a relay, make sure that we never build a path
  11017. through ourselves, even in the case where we have somehow lost the
  11018. version of our descriptor appearing in the consensus. Fixes part
  11019. of bug 21534; bugfix on 0.2.0.1-alpha. This issue is also tracked
  11020. as TROVE-2017-012 and CVE-2017-8822.
  11021. o Minor features (bridge, backport from 0.3.1.9):
  11022. - Bridges now include notice in their descriptors that they are
  11023. bridges, and notice of their distribution status, based on their
  11024. publication settings. Implements ticket 18329. For more fine-
  11025. grained control of how a bridge is distributed, upgrade to 0.3.2.x
  11026. or later.
  11027. o Minor features (directory authority, backport from 0.3.2.6-alpha):
  11028. - Add an IPv6 address for the "bastet" directory authority. Closes
  11029. ticket 24394.
  11030. o Minor features (geoip):
  11031. - Update geoip and geoip6 to the November 6 2017 Maxmind GeoLite2
  11032. Country database.
  11033. o Minor features (security, windows, backport from 0.3.1.1-alpha):
  11034. - Enable a couple of pieces of Windows hardening: one
  11035. (HeapEnableTerminationOnCorruption) that has been on-by-default
  11036. since Windows 8, and unavailable before Windows 7; and one
  11037. (PROCESS_DEP_DISABLE_ATL_THUNK_EMULATION) which we believe doesn't
  11038. affect us, but shouldn't do any harm. Closes ticket 21953.
  11039. o Minor bugfix (relay address resolution, backport from 0.3.2.1-alpha):
  11040. - Avoid unnecessary calls to directory_fetches_from_authorities() on
  11041. relays, to prevent spurious address resolutions and descriptor
  11042. rebuilds. This is a mitigation for bug 21789. Fixes bug 23470;
  11043. bugfix on in 0.2.8.1-alpha.
  11044. o Minor bugfixes (compilation, backport from 0.3.2.1-alpha):
  11045. - Fix unused variable warnings in donna's Curve25519 SSE2 code.
  11046. Fixes bug 22895; bugfix on 0.2.7.2-alpha.
  11047. o Minor bugfixes (logging, relay shutdown, annoyance, backport from 0.3.2.2-alpha):
  11048. - When a circuit is marked for close, do not attempt to package any
  11049. cells for channels on that circuit. Previously, we would detect
  11050. this condition lower in the call stack, when we noticed that the
  11051. circuit had no attached channel, and log an annoying message.
  11052. Fixes bug 8185; bugfix on 0.2.5.4-alpha.
  11053. o Minor bugfixes (relay, crash, backport from 0.3.2.4-alpha):
  11054. - Avoid a crash when transitioning from client mode to bridge mode.
  11055. Previously, we would launch the worker threads whenever our
  11056. "public server" mode changed, but not when our "server" mode
  11057. changed. Fixes bug 23693; bugfix on 0.2.6.3-alpha.
  11058. o Minor bugfixes (testing, backport from 0.3.1.6-rc):
  11059. - Fix an undersized buffer in test-memwipe.c. Fixes bug 23291;
  11060. bugfix on 0.2.7.2-alpha. Found and patched by Ties Stuij.
  11061. Changes in version 0.2.8.17 - 2017-12-01
  11062. Tor 0.2.8.17 backports important security and stability bugfixes from
  11063. later Tor releases. All Tor users should upgrade to this release, or
  11064. to another of the releases coming out today.
  11065. Note: the Tor 0.2.8 series will no longer be supported after 1 Jan
  11066. 2018. If you need a release with long-term support, please upgrade with
  11067. the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
  11068. o Major bugfixes (security, backport from 0.3.2.6-alpha):
  11069. - Fix a denial of service bug where an attacker could use a
  11070. malformed directory object to cause a Tor instance to pause while
  11071. OpenSSL would try to read a passphrase from the terminal. (Tor
  11072. instances run without a terminal, which is the case for most Tor
  11073. packages, are not impacted.) Fixes bug 24246; bugfix on every
  11074. version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
  11075. Found by OSS-Fuzz as testcase 6360145429790720.
  11076. - When checking for replays in the INTRODUCE1 cell data for a
  11077. (legacy) onion service, correctly detect replays in the RSA-
  11078. encrypted part of the cell. We were previously checking for
  11079. replays on the entire cell, but those can be circumvented due to
  11080. the malleability of Tor's legacy hybrid encryption. This fix helps
  11081. prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
  11082. 0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
  11083. and CVE-2017-8819.
  11084. o Major bugfixes (security, onion service v2, backport from 0.3.2.6-alpha):
  11085. - Fix a use-after-free error that could crash v2 Tor onion services
  11086. when they failed to open circuits while expiring introduction
  11087. points. Fixes bug 24313; bugfix on 0.2.7.2-alpha. This issue is
  11088. also tracked as TROVE-2017-013 and CVE-2017-8823.
  11089. o Major bugfixes (security, relay, backport from 0.3.2.6-alpha):
  11090. - When running as a relay, make sure that we never build a path through
  11091. ourselves, even in the case where we have somehow lost the version of
  11092. our descriptor appearing in the consensus. Fixes part of bug 21534;
  11093. bugfix on 0.2.0.1-alpha. This issue is also tracked as TROVE-2017-012
  11094. and CVE-2017-8822.
  11095. o Minor features (bridge, backport from 0.3.1.9):
  11096. - Bridges now include notice in their descriptors that they are
  11097. bridges, and notice of their distribution status, based on their
  11098. publication settings. Implements ticket 18329. For more fine-
  11099. grained control of how a bridge is distributed, upgrade to 0.3.2.x
  11100. or later.
  11101. o Minor features (directory authority, backport from 0.3.2.6-alpha):
  11102. - Add an IPv6 address for the "bastet" directory authority. Closes
  11103. ticket 24394.
  11104. o Minor features (geoip):
  11105. - Update geoip and geoip6 to the November 6 2017 Maxmind GeoLite2
  11106. Country database.
  11107. o Minor bugfixes (testing, backport from 0.3.1.6-rc):
  11108. - Fix an undersized buffer in test-memwipe.c. Fixes bug 23291;
  11109. bugfix on 0.2.7.2-alpha. Found and patched by Ties Stuij.
  11110. Changes in version 0.2.5.16 - 2017-12-01
  11111. Tor 0.2.5.13 backports important security and stability bugfixes from
  11112. later Tor releases. All Tor users should upgrade to this release, or
  11113. to another of the releases coming out today.
  11114. Note: the Tor 0.2.5 series will no longer be supported after 1 May
  11115. 2018. If you need a release with long-term support, please upgrade to
  11116. the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
  11117. o Major bugfixes (security, backport from 0.3.2.6-alpha):
  11118. - Fix a denial of service bug where an attacker could use a
  11119. malformed directory object to cause a Tor instance to pause while
  11120. OpenSSL would try to read a passphrase from the terminal. (Tor
  11121. instances run without a terminal, which is the case for most Tor
  11122. packages, are not impacted.) Fixes bug 24246; bugfix on every
  11123. version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
  11124. Found by OSS-Fuzz as testcase 6360145429790720.
  11125. - When checking for replays in the INTRODUCE1 cell data for a
  11126. (legacy) onion service, correctly detect replays in the RSA-
  11127. encrypted part of the cell. We were previously checking for
  11128. replays on the entire cell, but those can be circumvented due to
  11129. the malleability of Tor's legacy hybrid encryption. This fix helps
  11130. prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
  11131. 0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
  11132. and CVE-2017-8819.
  11133. o Major bugfixes (security, relay, backport from 0.3.2.6-alpha):
  11134. - When running as a relay, make sure that we never build a path
  11135. through ourselves, even in the case where we have somehow lost the
  11136. version of our descriptor appearing in the consensus. Fixes part
  11137. of bug 21534; bugfix on 0.2.0.1-alpha. This issue is also tracked
  11138. as TROVE-2017-012 and CVE-2017-8822.
  11139. o Minor features (bridge, backport from 0.3.1.9):
  11140. - Bridges now include notice in their descriptors that they are
  11141. bridges, and notice of their distribution status, based on their
  11142. publication settings. Implements ticket 18329. For more fine-
  11143. grained control of how a bridge is distributed, upgrade to 0.3.2.x
  11144. or later.
  11145. o Minor features (geoip):
  11146. - Update geoip and geoip6 to the November 6 2017 Maxmind GeoLite2
  11147. Country database.
  11148. Changes in version 0.2.5.15 - 2017-10-25
  11149. Tor 0.2.5.15 backports a collection of bugfixes from later Tor release
  11150. series. It also adds a new directory authority, Bastet.
  11151. Note: the Tor 0.2.5 series will no longer be supported after 1 May
  11152. 2018. If you need a release with long-term support, please upgrade to
  11153. the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
  11154. o Directory authority changes:
  11155. - Add "Bastet" as a ninth directory authority to the default list.
  11156. Closes ticket 23910.
  11157. - The directory authority "Longclaw" has changed its IP address.
  11158. Closes ticket 23592.
  11159. o Major bugfixes (openbsd, denial-of-service, backport from 0.3.1.5-alpha):
  11160. - Avoid an assertion failure bug affecting our implementation of
  11161. inet_pton(AF_INET6) on certain OpenBSD systems whose strtol()
  11162. handling of "0xx" differs from what we had expected. Fixes bug
  11163. 22789; bugfix on 0.2.3.8-alpha. Also tracked as TROVE-2017-007.
  11164. o Minor features (geoip):
  11165. - Update geoip and geoip6 to the October 4 2017 Maxmind GeoLite2
  11166. Country database.
  11167. o Minor bugfixes (defensive programming, undefined behavior, backport from 0.3.1.4-alpha):
  11168. - Fix a memset() off the end of an array when packing cells. This
  11169. bug should be harmless in practice, since the corrupted bytes are
  11170. still in the same structure, and are always padding bytes,
  11171. ignored, or immediately overwritten, depending on compiler
  11172. behavior. Nevertheless, because the memset()'s purpose is to make
  11173. sure that any other cell-handling bugs can't expose bytes to the
  11174. network, we need to fix it. Fixes bug 22737; bugfix on
  11175. 0.2.4.11-alpha. Fixes CID 1401591.
  11176. o Build features (backport from 0.3.1.5-alpha):
  11177. - Tor's repository now includes a Travis Continuous Integration (CI)
  11178. configuration file (.travis.yml). This is meant to help new
  11179. developers and contributors who fork Tor to a Github repository be
  11180. better able to test their changes, and understand what we expect
  11181. to pass. To use this new build feature, you must fork Tor to your
  11182. Github account, then go into the "Integrations" menu in the
  11183. repository settings for your fork and enable Travis, then push
  11184. your changes. Closes ticket 22636.
  11185. Changes in version 0.2.8.16 - 2017-10-25
  11186. Tor 0.2.8.16 backports a collection of bugfixes from later Tor release
  11187. series, including a bugfix for a crash issue that had affected relays
  11188. under memory pressure. It also adds a new directory authority, Bastet.
  11189. Note: the Tor 0.2.8 series will no longer be supported after 1 Jan
  11190. 2018. If you need a release with long-term support, please stick with
  11191. the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
  11192. o Directory authority changes:
  11193. - Add "Bastet" as a ninth directory authority to the default list.
  11194. Closes ticket 23910.
  11195. - The directory authority "Longclaw" has changed its IP address.
  11196. Closes ticket 23592.
  11197. o Major bugfixes (relay, crash, assertion failure, backport from 0.3.2.2-alpha):
  11198. - Fix a timing-based assertion failure that could occur when the
  11199. circuit out-of-memory handler freed a connection's output buffer.
  11200. Fixes bug 23690; bugfix on 0.2.6.1-alpha.
  11201. o Minor features (directory authorities, backport from 0.3.2.2-alpha):
  11202. - Remove longclaw's IPv6 address, as it will soon change. Authority
  11203. IPv6 addresses were originally added in 0.2.8.1-alpha. This leaves
  11204. 3/8 directory authorities with IPv6 addresses, but there are also
  11205. 52 fallback directory mirrors with IPv6 addresses. Resolves 19760.
  11206. o Minor features (geoip):
  11207. - Update geoip and geoip6 to the October 4 2017 Maxmind GeoLite2
  11208. Country database.
  11209. Changes in version 0.2.9.13 - 2017-10-25
  11210. Tor 0.2.9.13 backports a collection of bugfixes from later Tor release
  11211. series, including a bugfix for a crash issue that had affected relays
  11212. under memory pressure. It also adds a new directory authority, Bastet.
  11213. o Directory authority changes:
  11214. - Add "Bastet" as a ninth directory authority to the default list.
  11215. Closes ticket 23910.
  11216. - The directory authority "Longclaw" has changed its IP address.
  11217. Closes ticket 23592.
  11218. o Major bugfixes (relay, crash, assertion failure, backport from 0.3.2.2-alpha):
  11219. - Fix a timing-based assertion failure that could occur when the
  11220. circuit out-of-memory handler freed a connection's output buffer.
  11221. Fixes bug 23690; bugfix on 0.2.6.1-alpha.
  11222. o Minor features (directory authorities, backport from 0.3.2.2-alpha):
  11223. - Remove longclaw's IPv6 address, as it will soon change. Authority
  11224. IPv6 addresses were originally added in 0.2.8.1-alpha. This leaves
  11225. 3/8 directory authorities with IPv6 addresses, but there are also
  11226. 52 fallback directory mirrors with IPv6 addresses. Resolves 19760.
  11227. o Minor features (geoip):
  11228. - Update geoip and geoip6 to the October 4 2017 Maxmind GeoLite2
  11229. Country database.
  11230. o Minor bugfixes (directory authority, backport from 0.3.1.5-alpha):
  11231. - When a directory authority rejects a descriptor or extrainfo with
  11232. a given digest, mark that digest as undownloadable, so that we do
  11233. not attempt to download it again over and over. We previously
  11234. tried to avoid downloading such descriptors by other means, but we
  11235. didn't notice if we accidentally downloaded one anyway. This
  11236. behavior became problematic in 0.2.7.2-alpha, when authorities
  11237. began pinning Ed25519 keys. Fixes bug 22349; bugfix
  11238. on 0.2.1.19-alpha.
  11239. o Minor bugfixes (memory safety, backport from 0.3.2.3-alpha):
  11240. - Clear the address when node_get_prim_orport() returns early.
  11241. Fixes bug 23874; bugfix on 0.2.8.2-alpha.
  11242. o Minor bugfixes (Windows service, backport from 0.3.1.6-rc):
  11243. - When running as a Windows service, set the ID of the main thread
  11244. correctly. Failure to do so made us fail to send log messages to
  11245. the controller in 0.2.1.16-rc, slowed down controller event
  11246. delivery in 0.2.7.3-rc and later, and crash with an assertion
  11247. failure in 0.3.1.1-alpha. Fixes bug 23081; bugfix on 0.2.1.6-alpha.
  11248. Patch and diagnosis from "Vort".
  11249. Changes in version 0.3.0.12 - 2017-10-25
  11250. Tor 0.3.0.12 backports a collection of bugfixes from later Tor release
  11251. series, including a bugfix for a crash issue that had affected relays
  11252. under memory pressure. It also adds a new directory authority, Bastet.
  11253. Note: the Tor 0.3.0 series will no longer be supported after 26 Jan
  11254. 2018. If you need a release with long-term support, please stick with
  11255. the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
  11256. o Directory authority changes:
  11257. - Add "Bastet" as a ninth directory authority to the default list.
  11258. Closes ticket 23910.
  11259. - The directory authority "Longclaw" has changed its IP address.
  11260. Closes ticket 23592.
  11261. o Major bugfixes (relay, crash, assertion failure, backport from 0.3.2.2-alpha):
  11262. - Fix a timing-based assertion failure that could occur when the
  11263. circuit out-of-memory handler freed a connection's output buffer.
  11264. Fixes bug 23690; bugfix on 0.2.6.1-alpha.
  11265. o Minor features (directory authorities, backport from 0.3.2.2-alpha):
  11266. - Remove longclaw's IPv6 address, as it will soon change. Authority
  11267. IPv6 addresses were originally added in 0.2.8.1-alpha. This leaves
  11268. 3/8 directory authorities with IPv6 addresses, but there are also
  11269. 52 fallback directory mirrors with IPv6 addresses. Resolves 19760.
  11270. o Minor features (geoip):
  11271. - Update geoip and geoip6 to the October 4 2017 Maxmind GeoLite2
  11272. Country database.
  11273. o Minor bugfixes (directory authority, backport from 0.3.1.5-alpha):
  11274. - When a directory authority rejects a descriptor or extrainfo with
  11275. a given digest, mark that digest as undownloadable, so that we do
  11276. not attempt to download it again over and over. We previously
  11277. tried to avoid downloading such descriptors by other means, but we
  11278. didn't notice if we accidentally downloaded one anyway. This
  11279. behavior became problematic in 0.2.7.2-alpha, when authorities
  11280. began pinning Ed25519 keys. Fixes bug 22349; bugfix
  11281. on 0.2.1.19-alpha.
  11282. o Minor bugfixes (hidden service, relay, backport from 0.3.2.2-alpha):
  11283. - Avoid a possible double close of a circuit by the intro point on
  11284. error of sending the INTRO_ESTABLISHED cell. Fixes bug 23610;
  11285. bugfix on 0.3.0.1-alpha.
  11286. o Minor bugfixes (memory safety, backport from 0.3.2.3-alpha):
  11287. - Clear the address when node_get_prim_orport() returns early.
  11288. Fixes bug 23874; bugfix on 0.2.8.2-alpha.
  11289. o Minor bugfixes (Windows service, backport from 0.3.1.6-rc):
  11290. - When running as a Windows service, set the ID of the main thread
  11291. correctly. Failure to do so made us fail to send log messages to
  11292. the controller in 0.2.1.16-rc, slowed down controller event
  11293. delivery in 0.2.7.3-rc and later, and crash with an assertion
  11294. failure in 0.3.1.1-alpha. Fixes bug 23081; bugfix on 0.2.1.6-alpha.
  11295. Patch and diagnosis from "Vort".
  11296. Changes in version 0.3.1.8 - 2017-10-25
  11297. Tor 0.3.1.8 is the second stable release in the 0.3.1 series.
  11298. It includes several bugfixes, including a bugfix for a crash issue
  11299. that had affected relays under memory pressure. It also adds
  11300. a new directory authority, Bastet.
  11301. o Directory authority changes:
  11302. - Add "Bastet" as a ninth directory authority to the default list.
  11303. Closes ticket 23910.
  11304. - The directory authority "Longclaw" has changed its IP address.
  11305. Closes ticket 23592.
  11306. o Major bugfixes (relay, crash, assertion failure, backport from 0.3.2.2-alpha):
  11307. - Fix a timing-based assertion failure that could occur when the
  11308. circuit out-of-memory handler freed a connection's output buffer.
  11309. Fixes bug 23690; bugfix on 0.2.6.1-alpha.
  11310. o Minor features (directory authorities, backport from 0.3.2.2-alpha):
  11311. - Remove longclaw's IPv6 address, as it will soon change. Authority
  11312. IPv6 addresses were originally added in 0.2.8.1-alpha. This leaves
  11313. 3/8 directory authorities with IPv6 addresses, but there are also
  11314. 52 fallback directory mirrors with IPv6 addresses. Resolves 19760.
  11315. o Minor features (geoip):
  11316. - Update geoip and geoip6 to the October 4 2017 Maxmind GeoLite2
  11317. Country database.
  11318. o Minor bugfixes (compilation, backport from 0.3.2.2-alpha):
  11319. - Fix a compilation warning when building with zstd support on
  11320. 32-bit platforms. Fixes bug 23568; bugfix on 0.3.1.1-alpha. Found
  11321. and fixed by Andreas Stieger.
  11322. o Minor bugfixes (compression, backport from 0.3.2.2-alpha):
  11323. - Handle a pathological case when decompressing Zstandard data when
  11324. the output buffer size is zero. Fixes bug 23551; bugfix
  11325. on 0.3.1.1-alpha.
  11326. o Minor bugfixes (directory authority, backport from 0.3.2.1-alpha):
  11327. - Remove the length limit on HTTP status lines that authorities can
  11328. send in their replies. Fixes bug 23499; bugfix on 0.3.1.6-rc.
  11329. o Minor bugfixes (hidden service, relay, backport from 0.3.2.2-alpha):
  11330. - Avoid a possible double close of a circuit by the intro point on
  11331. error of sending the INTRO_ESTABLISHED cell. Fixes bug 23610;
  11332. bugfix on 0.3.0.1-alpha.
  11333. o Minor bugfixes (memory safety, backport from 0.3.2.3-alpha):
  11334. - Clear the address when node_get_prim_orport() returns early.
  11335. Fixes bug 23874; bugfix on 0.2.8.2-alpha.
  11336. o Minor bugfixes (unit tests, backport from 0.3.2.2-alpha):
  11337. - Fix additional channelpadding unit test failures by using mocked
  11338. time instead of actual time for all tests. Fixes bug 23608; bugfix
  11339. on 0.3.1.1-alpha.
  11340. Changes in version 0.2.8.15 - 2017-09-18
  11341. Tor 0.2.8.15 backports a collection of bugfixes from later
  11342. Tor series.
  11343. Most significantly, it includes a fix for TROVE-2017-008, a
  11344. security bug that affects hidden services running with the
  11345. SafeLogging option disabled. For more information, see
  11346. https://trac.torproject.org/projects/tor/ticket/23490
  11347. Note that Tor 0.2.8.x will no longer be supported after 1 Jan
  11348. 2018. We suggest that you upgrade to the latest stable release if
  11349. possible. If you can't, we recommend that you upgrade at least to
  11350. 0.2.9, which will be supported until 2020.
  11351. o Major bugfixes (openbsd, denial-of-service, backport from 0.3.1.5-alpha):
  11352. - Avoid an assertion failure bug affecting our implementation of
  11353. inet_pton(AF_INET6) on certain OpenBSD systems whose strtol()
  11354. handling of "0xx" differs from what we had expected. Fixes bug
  11355. 22789; bugfix on 0.2.3.8-alpha. Also tracked as TROVE-2017-007.
  11356. o Minor features:
  11357. - Update geoip and geoip6 to the September 6 2017 Maxmind GeoLite2
  11358. Country database.
  11359. o Minor bugfixes (compilation, mingw, backport from 0.3.1.1-alpha):
  11360. - Backport a fix for an "unused variable" warning that appeared
  11361. in some versions of mingw. Fixes bug 22838; bugfix on
  11362. 0.2.8.1-alpha.
  11363. o Minor bugfixes (defensive programming, undefined behavior, backport from 0.3.1.4-alpha):
  11364. - Fix a memset() off the end of an array when packing cells. This
  11365. bug should be harmless in practice, since the corrupted bytes are
  11366. still in the same structure, and are always padding bytes,
  11367. ignored, or immediately overwritten, depending on compiler
  11368. behavior. Nevertheless, because the memset()'s purpose is to make
  11369. sure that any other cell-handling bugs can't expose bytes to the
  11370. network, we need to fix it. Fixes bug 22737; bugfix on
  11371. 0.2.4.11-alpha. Fixes CID 1401591.
  11372. o Build features (backport from 0.3.1.5-alpha):
  11373. - Tor's repository now includes a Travis Continuous Integration (CI)
  11374. configuration file (.travis.yml). This is meant to help new
  11375. developers and contributors who fork Tor to a Github repository be
  11376. better able to test their changes, and understand what we expect
  11377. to pass. To use this new build feature, you must fork Tor to your
  11378. Github account, then go into the "Integrations" menu in the
  11379. repository settings for your fork and enable Travis, then push
  11380. your changes. Closes ticket 22636.
  11381. Changes in version 0.2.9.12 - 2017-09-18
  11382. Tor 0.2.9.12 backports a collection of bugfixes from later
  11383. Tor series.
  11384. Most significantly, it includes a fix for TROVE-2017-008, a
  11385. security bug that affects hidden services running with the
  11386. SafeLogging option disabled. For more information, see
  11387. https://trac.torproject.org/projects/tor/ticket/23490
  11388. o Major features (security, backport from 0.3.0.2-alpha):
  11389. - Change the algorithm used to decide DNS TTLs on client and server
  11390. side, to better resist DNS-based correlation attacks like the
  11391. DefecTor attack of Greschbach, Pulls, Roberts, Winter, and
  11392. Feamster. Now relays only return one of two possible DNS TTL
  11393. values, and clients are willing to believe DNS TTL values up to 3
  11394. hours long. Closes ticket 19769.
  11395. o Major bugfixes (crash, directory connections, backport from 0.3.0.5-rc):
  11396. - Fix a rare crash when sending a begin cell on a circuit whose
  11397. linked directory connection had already been closed. Fixes bug
  11398. 21576; bugfix on 0.2.9.3-alpha. Reported by Alec Muffett.
  11399. o Major bugfixes (DNS, backport from 0.3.0.2-alpha):
  11400. - Fix a bug that prevented exit nodes from caching DNS records for
  11401. more than 60 seconds. Fixes bug 19025; bugfix on 0.2.4.7-alpha.
  11402. o Major bugfixes (linux TPROXY support, backport from 0.3.1.1-alpha):
  11403. - Fix a typo that had prevented TPROXY-based transparent proxying
  11404. from working under Linux. Fixes bug 18100; bugfix on 0.2.6.3-alpha.
  11405. Patch from "d4fq0fQAgoJ".
  11406. o Major bugfixes (openbsd, denial-of-service, backport from 0.3.1.5-alpha):
  11407. - Avoid an assertion failure bug affecting our implementation of
  11408. inet_pton(AF_INET6) on certain OpenBSD systems whose strtol()
  11409. handling of "0xx" differs from what we had expected. Fixes bug
  11410. 22789; bugfix on 0.2.3.8-alpha. Also tracked as TROVE-2017-007.
  11411. o Minor features (code style, backport from 0.3.1.3-alpha):
  11412. - Add "Falls through" comments to our codebase, in order to silence
  11413. GCC 7's -Wimplicit-fallthrough warnings. Patch from Andreas
  11414. Stieger. Closes ticket 22446.
  11415. o Minor features (geoip):
  11416. - Update geoip and geoip6 to the September 6 2017 Maxmind GeoLite2
  11417. Country database.
  11418. o Minor bugfixes (bandwidth accounting, backport from 0.3.1.1-alpha):
  11419. - Roll over monthly accounting at the configured hour and minute,
  11420. rather than always at 00:00. Fixes bug 22245; bugfix on 0.0.9rc1.
  11421. Found by Andrey Karpov with PVS-Studio.
  11422. o Minor bugfixes (compilation, backport from 0.3.1.5-alpha):
  11423. - Suppress -Wdouble-promotion warnings with clang 4.0. Fixes bug 22915;
  11424. bugfix on 0.2.8.1-alpha.
  11425. - Fix warnings when building with libscrypt and openssl scrypt support
  11426. on Clang. Fixes bug 22916; bugfix on 0.2.7.2-alpha.
  11427. - When building with certain versions the mingw C header files, avoid
  11428. float-conversion warnings when calling the C functions isfinite(),
  11429. isnan(), and signbit(). Fixes bug 22801; bugfix on 0.2.8.1-alpha.
  11430. o Minor bugfixes (compilation, backport from 0.3.1.7):
  11431. - Avoid compiler warnings in the unit tests for running tor_sscanf()
  11432. with wide string outputs. Fixes bug 15582; bugfix on 0.2.6.2-alpha.
  11433. o Minor bugfixes (compilation, mingw, backport from 0.3.1.1-alpha):
  11434. - Backport a fix for an "unused variable" warning that appeared
  11435. in some versions of mingw. Fixes bug 22838; bugfix on
  11436. 0.2.8.1-alpha.
  11437. o Minor bugfixes (controller, backport from 0.3.1.7):
  11438. - Do not crash when receiving a HSPOST command with an empty body.
  11439. Fixes part of bug 22644; bugfix on 0.2.7.1-alpha.
  11440. - Do not crash when receiving a POSTDESCRIPTOR command with an
  11441. empty body. Fixes part of bug 22644; bugfix on 0.2.0.1-alpha.
  11442. o Minor bugfixes (coverity build support, backport from 0.3.1.5-alpha):
  11443. - Avoid Coverity build warnings related to our BUG() macro. By
  11444. default, Coverity treats BUG() as the Linux kernel does: an
  11445. instant abort(). We need to override that so our BUG() macro
  11446. doesn't prevent Coverity from analyzing functions that use it.
  11447. Fixes bug 23030; bugfix on 0.2.9.1-alpha.
  11448. o Minor bugfixes (defensive programming, undefined behavior, backport from 0.3.1.4-alpha):
  11449. - Fix a memset() off the end of an array when packing cells. This
  11450. bug should be harmless in practice, since the corrupted bytes are
  11451. still in the same structure, and are always padding bytes,
  11452. ignored, or immediately overwritten, depending on compiler
  11453. behavior. Nevertheless, because the memset()'s purpose is to make
  11454. sure that any other cell-handling bugs can't expose bytes to the
  11455. network, we need to fix it. Fixes bug 22737; bugfix on
  11456. 0.2.4.11-alpha. Fixes CID 1401591.
  11457. o Minor bugfixes (file limits, osx, backport from 0.3.1.5-alpha):
  11458. - When setting the maximum number of connections allowed by the OS,
  11459. always allow some extra file descriptors for other files. Fixes
  11460. bug 22797; bugfix on 0.2.0.10-alpha.
  11461. o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.1.5-alpha):
  11462. - Avoid a sandbox failure when trying to re-bind to a socket and
  11463. mark it as IPv6-only. Fixes bug 20247; bugfix on 0.2.5.1-alpha.
  11464. o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.1.4-alpha):
  11465. - Permit the fchmod system call, to avoid crashing on startup when
  11466. starting with the seccomp2 sandbox and an unexpected set of
  11467. permissions on the data directory or its contents. Fixes bug
  11468. 22516; bugfix on 0.2.5.4-alpha.
  11469. o Minor bugfixes (relay, backport from 0.3.0.5-rc):
  11470. - Avoid a double-marked-circuit warning that could happen when we
  11471. receive DESTROY cells under heavy load. Fixes bug 20059; bugfix
  11472. on 0.1.0.1-rc.
  11473. o Minor bugfixes (voting consistency, backport from 0.3.1.1-alpha):
  11474. - Reject version numbers with non-numeric prefixes (such as +, -, or
  11475. whitespace). Disallowing whitespace prevents differential version
  11476. parsing between POSIX-based and Windows platforms. Fixes bug 21507
  11477. and part of 21508; bugfix on 0.0.8pre1.
  11478. o Build features (backport from 0.3.1.5-alpha):
  11479. - Tor's repository now includes a Travis Continuous Integration (CI)
  11480. configuration file (.travis.yml). This is meant to help new
  11481. developers and contributors who fork Tor to a Github repository be
  11482. better able to test their changes, and understand what we expect
  11483. to pass. To use this new build feature, you must fork Tor to your
  11484. Github account, then go into the "Integrations" menu in the
  11485. repository settings for your fork and enable Travis, then push
  11486. your changes. Closes ticket 22636.
  11487. Changes in version 0.3.0.11 - 2017-09-18
  11488. Tor 0.3.0.11 backports a collection of bugfixes from Tor the 0.3.1
  11489. series.
  11490. Most significantly, it includes a fix for TROVE-2017-008, a
  11491. security bug that affects hidden services running with the
  11492. SafeLogging option disabled. For more information, see
  11493. https://trac.torproject.org/projects/tor/ticket/23490
  11494. o Minor features (code style, backport from 0.3.1.7):
  11495. - Add "Falls through" comments to our codebase, in order to silence
  11496. GCC 7's -Wimplicit-fallthrough warnings. Patch from Andreas
  11497. Stieger. Closes ticket 22446.
  11498. o Minor features:
  11499. - Update geoip and geoip6 to the September 6 2017 Maxmind GeoLite2
  11500. Country database.
  11501. o Minor bugfixes (compilation, backport from 0.3.1.7):
  11502. - Avoid compiler warnings in the unit tests for calling tor_sscanf()
  11503. with wide string outputs. Fixes bug 15582; bugfix on 0.2.6.2-alpha.
  11504. o Minor bugfixes (controller, backport from 0.3.1.7):
  11505. - Do not crash when receiving a HSPOST command with an empty body.
  11506. Fixes part of bug 22644; bugfix on 0.2.7.1-alpha.
  11507. - Do not crash when receiving a POSTDESCRIPTOR command with an empty
  11508. body. Fixes part of bug 22644; bugfix on 0.2.0.1-alpha.
  11509. o Minor bugfixes (file limits, osx, backport from 0.3.1.5-alpha):
  11510. - When setting the maximum number of connections allowed by the OS,
  11511. always allow some extra file descriptors for other files. Fixes
  11512. bug 22797; bugfix on 0.2.0.10-alpha.
  11513. o Minor bugfixes (logging, relay, backport from 0.3.1.6-rc):
  11514. - Remove a forgotten debugging message when an introduction point
  11515. successfully establishes a hidden service prop224 circuit with
  11516. a client.
  11517. - Change three other log_warn() for an introduction point to
  11518. protocol warnings, because they can be failure from the network
  11519. and are not relevant to the operator. Fixes bug 23078; bugfix on
  11520. 0.3.0.1-alpha and 0.3.0.2-alpha.
  11521. Changes in version 0.3.1.7 - 2017-09-18
  11522. Tor 0.3.1.7 is the first stable release in the 0.3.1 series.
  11523. With the 0.3.1 series, Tor now serves and downloads directory
  11524. information in more compact formats, to save on bandwidth overhead. It
  11525. also contains a new padding system to resist netflow-based traffic
  11526. analysis, and experimental support for building parts of Tor in Rust
  11527. (though no parts of Tor are in Rust yet). There are also numerous
  11528. small features, bugfixes on earlier release series, and groundwork for
  11529. the hidden services revamp of 0.3.2.
  11530. This release also includes a fix for TROVE-2017-008, a security bug
  11531. that affects hidden services running with the SafeLogging option
  11532. disabled. For more information, see
  11533. https://trac.torproject.org/projects/tor/ticket/23490
  11534. Per our stable release policy, we plan to support each stable release
  11535. series for at least the next nine months, or for three months after
  11536. the first stable release of the next series: whichever is longer. If
  11537. you need a release with long-term support, we recommend that you stay
  11538. with the 0.2.9 series.
  11539. Below is a list of the changes since 0.3.0. For a list of all
  11540. changes since 0.3.1.6-rc, see the ChangeLog file.
  11541. o New dependencies:
  11542. - To build with zstd and lzma support, Tor now requires the
  11543. pkg-config tool at build time.
  11544. o Major bugfixes (security, hidden services, loggging):
  11545. - Fix a bug where we could log uninitialized stack when a certain
  11546. hidden service error occurred while SafeLogging was disabled.
  11547. Fixes bug #23490; bugfix on 0.2.7.2-alpha.
  11548. This is also tracked as TROVE-2017-008 and CVE-2017-0380.
  11549. o Major features (build system, continuous integration):
  11550. - Tor's repository now includes a Travis Continuous Integration (CI)
  11551. configuration file (.travis.yml). This is meant to help new
  11552. developers and contributors who fork Tor to a Github repository be
  11553. better able to test their changes, and understand what we expect
  11554. to pass. To use this new build feature, you must fork Tor to your
  11555. Github account, then go into the "Integrations" menu in the
  11556. repository settings for your fork and enable Travis, then push
  11557. your changes. Closes ticket 22636.
  11558. o Major features (directory protocol):
  11559. - Tor relays and authorities can now serve clients an abbreviated
  11560. version of the consensus document, containing only the changes
  11561. since an older consensus document that the client holds. Clients
  11562. now request these documents when available. When both client and
  11563. server use this new protocol, they will use far less bandwidth (up
  11564. to 94% less) to keep the client's consensus up-to-date. Implements
  11565. proposal 140; closes ticket 13339. Based on work by Daniel Martí.
  11566. - Tor can now compress directory traffic with lzma or with zstd
  11567. compression algorithms, which can deliver better bandwidth
  11568. performance. Because lzma is computationally expensive, it's only
  11569. used for documents that can be compressed once and served many
  11570. times. Support for these algorithms requires that tor is built
  11571. with the libzstd and/or liblzma libraries available. Implements
  11572. proposal 278; closes ticket 21662.
  11573. - Relays now perform the more expensive compression operations, and
  11574. consensus diff generation, in worker threads. This separation
  11575. avoids delaying the main thread when a new consensus arrives.
  11576. o Major features (experimental):
  11577. - Tor can now build modules written in Rust. To turn this on, pass
  11578. the "--enable-rust" flag to the configure script. It's not time to
  11579. get excited yet: currently, there is no actual Rust functionality
  11580. beyond some simple glue code, and a notice at startup to tell you
  11581. that Rust is running. Still, we hope that programmers and
  11582. packagers will try building Tor with Rust support, so that we can
  11583. find issues and solve portability problems. Closes ticket 22106.
  11584. o Major features (traffic analysis resistance):
  11585. - Connections between clients and relays now send a padding cell in
  11586. each direction every 1.5 to 9.5 seconds (tunable via consensus
  11587. parameters). This padding will not resist specialized
  11588. eavesdroppers, but it should be enough to make many ISPs' routine
  11589. network flow logging less useful in traffic analysis against
  11590. Tor users.
  11591. Padding is negotiated using Tor's link protocol, so both relays
  11592. and clients must upgrade for this to take effect. Clients may
  11593. still send padding despite the relay's version by setting
  11594. ConnectionPadding 1 in torrc, and may disable padding by setting
  11595. ConnectionPadding 0 in torrc. Padding may be minimized for mobile
  11596. users with the torrc option ReducedConnectionPadding. Implements
  11597. Proposal 251 and Section 2 of Proposal 254; closes ticket 16861.
  11598. - Relays will publish 24 hour totals of padding and non-padding cell
  11599. counts to their extra-info descriptors, unless PaddingStatistics 0
  11600. is set in torrc. These 24 hour totals are also rounded to
  11601. multiples of 10000.
  11602. o Major bugfixes (hidden service, relay, security):
  11603. - Fix a remotely triggerable assertion failure when a hidden service
  11604. handles a malformed BEGIN cell. Fixes bug 22493, tracked as
  11605. TROVE-2017-004 and as CVE-2017-0375; bugfix on 0.3.0.1-alpha.
  11606. - Fix a remotely triggerable assertion failure caused by receiving a
  11607. BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
  11608. 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
  11609. on 0.2.2.1-alpha.
  11610. o Major bugfixes (path selection, security):
  11611. - When choosing which guard to use for a circuit, avoid the exit's
  11612. family along with the exit itself. Previously, the new guard
  11613. selection logic avoided the exit, but did not consider its family.
  11614. Fixes bug 22753; bugfix on 0.3.0.1-alpha. Tracked as TROVE-2017-
  11615. 006 and CVE-2017-0377.
  11616. o Major bugfixes (connection usage):
  11617. - We use NETINFO cells to try to determine if both relays involved
  11618. in a connection will agree on the canonical status of that
  11619. connection. We prefer the connections where this is the case for
  11620. extend cells, and try to close connections where relays disagree
  11621. on their canonical status early. Also, we now prefer the oldest
  11622. valid connection for extend cells. These two changes should reduce
  11623. the number of long-term connections that are kept open between
  11624. relays. Fixes bug 17604; bugfix on 0.2.5.5-alpha.
  11625. - Relays now log hourly statistics (look for
  11626. "channel_check_for_duplicates" lines) on the total number of
  11627. connections to other relays. If the number of connections per
  11628. relay is unexpectedly large, this log message is at notice level.
  11629. Otherwise it is at info.
  11630. o Major bugfixes (entry guards):
  11631. - When starting with an old consensus, do not add new entry guards
  11632. unless the consensus is "reasonably live" (under 1 day old). Fixes
  11633. one root cause of bug 22400; bugfix on 0.3.0.1-alpha.
  11634. - Don't block bootstrapping when a primary bridge is offline and we
  11635. can't get its descriptor. Fixes bug 22325; fixes one case of bug
  11636. 21969; bugfix on 0.3.0.3-alpha.
  11637. o Major bugfixes (linux TPROXY support):
  11638. - Fix a typo that had prevented TPROXY-based transparent proxying
  11639. from working under Linux. Fixes bug 18100; bugfix on 0.2.6.3-alpha.
  11640. Patch from "d4fq0fQAgoJ".
  11641. o Major bugfixes (openbsd, denial-of-service):
  11642. - Avoid an assertion failure bug affecting our implementation of
  11643. inet_pton(AF_INET6) on certain OpenBSD systems whose strtol()
  11644. handling of "0xx" differs from what we had expected. Fixes bug
  11645. 22789; bugfix on 0.2.3.8-alpha. Also tracked as TROVE-2017-007.
  11646. o Major bugfixes (relay, link handshake):
  11647. - When performing the v3 link handshake on a TLS connection, report
  11648. that we have the x509 certificate that we actually used on that
  11649. connection, even if we have changed certificates since that
  11650. connection was first opened. Previously, we would claim to have
  11651. used our most recent x509 link certificate, which would sometimes
  11652. make the link handshake fail. Fixes one case of bug 22460; bugfix
  11653. on 0.2.3.6-alpha.
  11654. o Major bugfixes (relays, key management):
  11655. - Regenerate link and authentication certificates whenever the key
  11656. that signs them changes; also, regenerate link certificates
  11657. whenever the signed key changes. Previously, these processes were
  11658. only weakly coupled, and we relays could (for minutes to hours)
  11659. wind up with an inconsistent set of keys and certificates, which
  11660. other relays would not accept. Fixes two cases of bug 22460;
  11661. bugfix on 0.3.0.1-alpha.
  11662. - When sending an Ed25519 signing->link certificate in a CERTS cell,
  11663. send the certificate that matches the x509 certificate that we
  11664. used on the TLS connection. Previously, there was a race condition
  11665. if the TLS context rotated after we began the TLS handshake but
  11666. before we sent the CERTS cell. Fixes a case of bug 22460; bugfix
  11667. on 0.3.0.1-alpha.
  11668. o Minor features (security, windows):
  11669. - Enable a couple of pieces of Windows hardening: one
  11670. (HeapEnableTerminationOnCorruption) that has been on-by-default
  11671. since Windows 8, and unavailable before Windows 7; and one
  11672. (PROCESS_DEP_DISABLE_ATL_THUNK_EMULATION) which we believe doesn't
  11673. affect us, but shouldn't do any harm. Closes ticket 21953.
  11674. o Minor features (bridge authority):
  11675. - Add "fingerprint" lines to the networkstatus-bridges file produced
  11676. by bridge authorities. Closes ticket 22207.
  11677. o Minor features (code style):
  11678. - Add "Falls through" comments to our codebase, in order to silence
  11679. GCC 7's -Wimplicit-fallthrough warnings. Patch from Andreas
  11680. Stieger. Closes ticket 22446.
  11681. o Minor features (config options):
  11682. - Allow "%include" directives in torrc configuration files. These
  11683. directives import the settings from other files, or from all the
  11684. files in a directory. Closes ticket 1922. Code by Daniel Pinto.
  11685. - Make SAVECONF return an error when overwriting a torrc that has
  11686. includes. Using SAVECONF with the FORCE option will allow it to
  11687. overwrite torrc even if includes are used. Related to ticket 1922.
  11688. - Add "GETINFO config-can-saveconf" to tell controllers if SAVECONF
  11689. will work without the FORCE option. Related to ticket 1922.
  11690. o Minor features (controller):
  11691. - Warn the first time that a controller requests data in the long-
  11692. deprecated 'GETINFO network-status' format. Closes ticket 21703.
  11693. o Minor features (defaults):
  11694. - The default value for UseCreateFast is now 0: clients which
  11695. haven't yet received a consensus document will now use a proper
  11696. ntor handshake to talk to their directory servers whenever they
  11697. can. Closes ticket 21407.
  11698. - Onion key rotation and expiry intervals are now defined as a
  11699. network consensus parameter, per proposal 274. The default
  11700. lifetime of an onion key is increased from 7 to 28 days. Old onion
  11701. keys will expire after 7 days by default. This change will make
  11702. consensus diffs much smaller, and save significant bandwidth.
  11703. Closes ticket 21641.
  11704. o Minor features (defensive programming):
  11705. - Create a pair of consensus parameters, nf_pad_tor2web and
  11706. nf_pad_single_onion, to disable netflow padding in the consensus
  11707. for non-anonymous connections in case the overhead is high. Closes
  11708. ticket 17857.
  11709. o Minor features (diagnostic):
  11710. - Add a stack trace to the bug warnings that can be logged when
  11711. trying to send an outgoing relay cell with n_chan == 0. Diagnostic
  11712. attempt for bug 23105.
  11713. - Add logging messages to try to diagnose a rare bug that seems to
  11714. generate RSA->Ed25519 cross-certificates dated in the 1970s. We
  11715. think this is happening because of incorrect system clocks, but
  11716. we'd like to know for certain. Diagnostic for bug 22466.
  11717. - Avoid an assertion failure, and log a better error message, when
  11718. unable to remove a file from the consensus cache on Windows.
  11719. Attempts to mitigate and diagnose bug 22752.
  11720. o Minor features (directory authority):
  11721. - Improve the message that authorities report to relays that present
  11722. RSA/Ed25519 keypairs that conflict with previously pinned keys.
  11723. Closes ticket 22348.
  11724. o Minor features (directory cache, consensus diff):
  11725. - Add a new MaxConsensusAgeForDiffs option to allow directory cache
  11726. operators with low-resource environments to adjust the number of
  11727. consensuses they'll store and generate diffs from. Most cache
  11728. operators should leave it unchanged. Helps to work around
  11729. bug 22883.
  11730. o Minor features (fallback directory list):
  11731. - Update the fallback directory mirror whitelist and blacklist based
  11732. on operator emails. Closes task 21121.
  11733. - Replace the 177 fallbacks originally introduced in Tor 0.2.9.8 in
  11734. December 2016 (of which ~126 were still functional) with a list of
  11735. 151 fallbacks (32 new, 119 unchanged, 58 removed) generated in May
  11736. 2017. Resolves ticket 21564.
  11737. o Minor features (geoip):
  11738. - Update geoip and geoip6 to the September 6 2017 Maxmind GeoLite2
  11739. Country database.
  11740. o Minor features (hidden services, logging):
  11741. - Log a message when a hidden service descriptor has fewer
  11742. introduction points than specified in
  11743. HiddenServiceNumIntroductionPoints. Closes tickets 21598.
  11744. - Log a message when a hidden service reaches its introduction point
  11745. circuit limit, and when that limit is reset. Follow up to ticket
  11746. 21594; closes ticket 21622.
  11747. - Warn user if multiple entries in EntryNodes and at least one
  11748. HiddenService are used together. Pinning EntryNodes along with a
  11749. hidden service can be possibly harmful; for instance see ticket
  11750. 14917 or 21155. Closes ticket 21155.
  11751. o Minor features (linux seccomp2 sandbox):
  11752. - We now have a document storage backend compatible with the Linux
  11753. seccomp2 sandbox. This backend is used for consensus documents and
  11754. diffs between them; in the long term, we'd like to use it for
  11755. unparseable directory material too. Closes ticket 21645
  11756. - Increase the maximum allowed size passed to mprotect(PROT_WRITE)
  11757. from 1MB to 16MB. This was necessary with the glibc allocator in
  11758. order to allow worker threads to allocate more memory -- which in
  11759. turn is necessary because of our new use of worker threads for
  11760. compression. Closes ticket 22096.
  11761. o Minor features (logging):
  11762. - Log files are no longer created world-readable by default.
  11763. (Previously, most distributors would store the logs in a non-
  11764. world-readable location to prevent inappropriate access. This
  11765. change is an extra precaution.) Closes ticket 21729; patch
  11766. from toralf.
  11767. o Minor features (performance):
  11768. - Our Keccak (SHA-3) implementation now accesses memory more
  11769. efficiently, especially on little-endian systems. Closes
  11770. ticket 21737.
  11771. - Add an O(1) implementation of channel_find_by_global_id(), to
  11772. speed some controller functions.
  11773. o Minor features (relay, configuration):
  11774. - The MyFamily option may now be repeated as many times as desired,
  11775. for relays that want to configure large families. Closes ticket
  11776. 4998; patch by Daniel Pinto.
  11777. o Minor features (relay, performance):
  11778. - Always start relays with at least two worker threads, to prevent
  11779. priority inversion on slow tasks. Part of the fix for bug 22883.
  11780. - Allow background work to be queued with different priorities, so
  11781. that a big pile of slow low-priority jobs will not starve out
  11782. higher priority jobs. This lays the groundwork for a fix for
  11783. bug 22883.
  11784. o Minor features (safety):
  11785. - Add an explicit check to extrainfo_parse_entry_from_string() for
  11786. NULL inputs. We don't believe this can actually happen, but it may
  11787. help silence a warning from the Clang analyzer. Closes
  11788. ticket 21496.
  11789. o Minor features (testing):
  11790. - Add more tests for compression backend initialization. Closes
  11791. ticket 22286.
  11792. - Add a "--disable-memory-sentinels" feature to help with fuzzing.
  11793. When Tor is compiled with this option, we disable a number of
  11794. redundant memory-safety failsafes that are intended to stop bugs
  11795. from becoming security issues. This makes it easier to hunt for
  11796. bugs that would be security issues without the failsafes turned
  11797. on. Closes ticket 21439.
  11798. - Add a general event-tracing instrumentation support to Tor. This
  11799. subsystem will enable developers and researchers to add fine-
  11800. grained instrumentation to their Tor instances, for use when
  11801. examining Tor network performance issues. There are no trace
  11802. events yet, and event-tracing is off by default unless enabled at
  11803. compile time. Implements ticket 13802.
  11804. - Improve our version parsing tests: add tests for typical version
  11805. components, add tests for invalid versions, including numeric
  11806. range and non-numeric prefixes. Unit tests 21278, 21450, and
  11807. 21507. Partially implements 21470.
  11808. o Minor bugfixes (bandwidth accounting):
  11809. - Roll over monthly accounting at the configured hour and minute,
  11810. rather than always at 00:00. Fixes bug 22245; bugfix on 0.0.9rc1.
  11811. Found by Andrey Karpov with PVS-Studio.
  11812. o Minor bugfixes (code correctness):
  11813. - Accurately identify client connections by their lack of peer
  11814. authentication. This means that we bail out earlier if asked to
  11815. extend to a client. Follow-up to 21407. Fixes bug 21406; bugfix
  11816. on 0.2.4.23.
  11817. o Minor bugfixes (compilation warnings):
  11818. - Suppress -Wdouble-promotion warnings with clang 4.0. Fixes bug
  11819. 22915; bugfix on 0.2.8.1-alpha.
  11820. - Fix warnings when building with libscrypt and openssl scrypt
  11821. support on Clang. Fixes bug 22916; bugfix on 0.2.7.2-alpha.
  11822. - When building with certain versions of the mingw C header files,
  11823. avoid float-conversion warnings when calling the C functions
  11824. isfinite(), isnan(), and signbit(). Fixes bug 22801; bugfix
  11825. on 0.2.8.1-alpha.
  11826. o Minor bugfixes (compilation):
  11827. - Avoid compiler warnings in the unit tests for calling tor_sscanf()
  11828. with wide string outputs. Fixes bug 15582; bugfix on 0.2.6.2-alpha.
  11829. o Minor bugfixes (compression):
  11830. - When spooling compressed data to an output buffer, don't try to
  11831. spool more data when there is no more data to spool and we are not
  11832. trying to flush the input. Previously, we would sometimes launch
  11833. compression requests with nothing to do, which interferes with our
  11834. 22672 checks. Fixes bug 22719; bugfix on 0.2.0.16-alpha.
  11835. o Minor bugfixes (configuration):
  11836. - Do not crash when starting with LearnCircuitBuildTimeout 0. Fixes
  11837. bug 22252; bugfix on 0.2.9.3-alpha.
  11838. o Minor bugfixes (connection lifespan):
  11839. - Allow more control over how long TLS connections are kept open:
  11840. unify CircuitIdleTimeout and PredictedPortsRelevanceTime into a
  11841. single option called CircuitsAvailableTimeout. Also, allow the
  11842. consensus to control the default values for both this preference
  11843. and the lifespan of relay-to-relay connections. Fixes bug 17592;
  11844. bugfix on 0.2.5.5-alpha.
  11845. - Increase the initial circuit build timeout testing frequency, to
  11846. help ensure that ReducedConnectionPadding clients finish learning
  11847. a timeout before their orconn would expire. The initial testing
  11848. rate was set back in the days of TAP and before the Tor Browser
  11849. updater, when we had to be much more careful about new clients
  11850. making lots of circuits. With this change, a circuit build timeout
  11851. is learned in about 15-20 minutes, instead of 100-120 minutes.
  11852. o Minor bugfixes (controller):
  11853. - Do not crash when receiving a HSPOST command with an empty body.
  11854. Fixes part of bug 22644; bugfix on 0.2.7.1-alpha.
  11855. - Do not crash when receiving a POSTDESCRIPTOR command with an empty
  11856. body. Fixes part of bug 22644; bugfix on 0.2.0.1-alpha.
  11857. - GETINFO onions/current and onions/detached no longer respond with
  11858. 551 on empty lists. Fixes bug 21329; bugfix on 0.2.7.1-alpha.
  11859. - Trigger HS descriptor events on the control port when the client
  11860. fails to pick a hidden service directory for a hidden service.
  11861. This can happen if all the hidden service directories are in
  11862. ExcludeNodes, or they have all been queried within the last 15
  11863. minutes. Fixes bug 22042; bugfix on 0.2.5.2-alpha.
  11864. o Minor bugfixes (correctness):
  11865. - Avoid undefined behavior when parsing IPv6 entries from the geoip6
  11866. file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
  11867. o Minor bugfixes (coverity build support):
  11868. - Avoid Coverity build warnings related to our BUG() macro. By
  11869. default, Coverity treats BUG() as the Linux kernel does: an
  11870. instant abort(). We need to override that so our BUG() macro
  11871. doesn't prevent Coverity from analyzing functions that use it.
  11872. Fixes bug 23030; bugfix on 0.2.9.1-alpha.
  11873. o Minor bugfixes (defensive programming):
  11874. - Detect and break out of infinite loops in our compression code. We
  11875. don't think that any such loops exist now, but it's best to be
  11876. safe. Closes ticket 22672.
  11877. - Fix a memset() off the end of an array when packing cells. This
  11878. bug should be harmless in practice, since the corrupted bytes are
  11879. still in the same structure, and are always padding bytes,
  11880. ignored, or immediately overwritten, depending on compiler
  11881. behavior. Nevertheless, because the memset()'s purpose is to make
  11882. sure that any other cell-handling bugs can't expose bytes to the
  11883. network, we need to fix it. Fixes bug 22737; bugfix on
  11884. 0.2.4.11-alpha. Fixes CID 1401591.
  11885. o Minor bugfixes (directory authority):
  11886. - When a directory authority rejects a descriptor or extrainfo with
  11887. a given digest, mark that digest as undownloadable, so that we do
  11888. not attempt to download it again over and over. We previously
  11889. tried to avoid downloading such descriptors by other means, but we
  11890. didn't notice if we accidentally downloaded one anyway. This
  11891. behavior became problematic in 0.2.7.2-alpha, when authorities
  11892. began pinning Ed25519 keys. Fixes bug 22349; bugfix
  11893. on 0.2.1.19-alpha.
  11894. - When rejecting a router descriptor for running an obsolete version
  11895. of Tor without ntor support, warn about the obsolete tor version,
  11896. not the missing ntor key. Fixes bug 20270; bugfix on 0.2.9.3-alpha.
  11897. - Prevent the shared randomness subsystem from asserting when
  11898. initialized by a bridge authority with an incomplete configuration
  11899. file. Fixes bug 21586; bugfix on 0.2.9.8.
  11900. o Minor bugfixes (error reporting, windows):
  11901. - When formatting Windows error messages, use the English format to
  11902. avoid codepage issues. Fixes bug 22520; bugfix on 0.1.2.8-alpha.
  11903. Patch from "Vort".
  11904. o Minor bugfixes (exit-side DNS):
  11905. - Fix an untriggerable assertion that checked the output of a
  11906. libevent DNS error, so that the assertion actually behaves as
  11907. expected. Fixes bug 22244; bugfix on 0.2.0.20-rc. Found by Andrey
  11908. Karpov using PVS-Studio.
  11909. o Minor bugfixes (fallback directories):
  11910. - Make the usage example in updateFallbackDirs.py actually work, and
  11911. explain what it does. Fixes bug 22270; bugfix on 0.3.0.3-alpha.
  11912. - Decrease the guard flag average required to be a fallback. This
  11913. allows us to keep relays that have their guard flag removed when
  11914. they restart. Fixes bug 20913; bugfix on 0.2.8.1-alpha.
  11915. - Decrease the minimum number of fallbacks to 100. Fixes bug 20913;
  11916. bugfix on 0.2.8.1-alpha.
  11917. - Make sure fallback directory mirrors have the same address, port,
  11918. and relay identity key for at least 30 days before they are
  11919. selected. Fixes bug 20913; bugfix on 0.2.8.1-alpha.
  11920. o Minor bugfixes (file limits, osx):
  11921. - When setting the maximum number of connections allowed by the OS,
  11922. always allow some extra file descriptors for other files. Fixes
  11923. bug 22797; bugfix on 0.2.0.10-alpha.
  11924. o Minor bugfixes (hidden services):
  11925. - Increase the number of circuits that a service is allowed to
  11926. open over a specific period of time. The value was lower than it
  11927. should be (8 vs 12) in the normal case of 3 introduction points.
  11928. Fixes bug 22159; bugfix on 0.3.0.5-rc.
  11929. - Fix a BUG warning during HSv3 descriptor decoding that could be
  11930. cause by a specially crafted descriptor. Fixes bug 23233; bugfix
  11931. on 0.3.0.1-alpha. Bug found by "haxxpop".
  11932. - Stop printing a cryptic warning when a hidden service gets a
  11933. request to connect to a virtual port that it hasn't configured.
  11934. Fixes bug 16706; bugfix on 0.2.6.3-alpha.
  11935. - Simplify hidden service descriptor creation by using an existing
  11936. flag to check if an introduction point is established. Fixes bug
  11937. 21599; bugfix on 0.2.7.2-alpha.
  11938. o Minor bugfixes (link handshake):
  11939. - Lower the lifetime of the RSA->Ed25519 cross-certificate to six
  11940. months, and regenerate it when it is within one month of expiring.
  11941. Previously, we had generated this certificate at startup with a
  11942. ten-year lifetime, but that could lead to weird behavior when Tor
  11943. was started with a grossly inaccurate clock. Mitigates bug 22466;
  11944. mitigation on 0.3.0.1-alpha.
  11945. o Minor bugfixes (linux seccomp2 sandbox):
  11946. - Avoid a sandbox failure when trying to re-bind to a socket and
  11947. mark it as IPv6-only. Fixes bug 20247; bugfix on 0.2.5.1-alpha.
  11948. - Permit the fchmod system call, to avoid crashing on startup when
  11949. starting with the seccomp2 sandbox and an unexpected set of
  11950. permissions on the data directory or its contents. Fixes bug
  11951. 22516; bugfix on 0.2.5.4-alpha.
  11952. o Minor bugfixes (logging):
  11953. - When decompressing, do not warn if we fail to decompress using a
  11954. compression method that we merely guessed. Fixes part of bug
  11955. 22670; bugfix on 0.1.1.14-alpha.
  11956. - When decompressing, treat mismatch between content-encoding and
  11957. actual compression type as a protocol warning. Fixes part of bug
  11958. 22670; bugfix on 0.1.1.9-alpha.
  11959. - Downgrade "assigned_to_cpuworker failed" message to info-level
  11960. severity. In every case that can reach it, either a better warning
  11961. has already been logged, or no warning is warranted. Fixes bug
  11962. 22356; bugfix on 0.2.6.3-alpha.
  11963. - Log a better message when a directory authority replies to an
  11964. upload with an unexpected status code. Fixes bug 11121; bugfix
  11965. on 0.1.0.1-rc.
  11966. - Downgrade a log statement about unexpected relay cells from "bug"
  11967. to "protocol warning", because there is at least one use case
  11968. where it can be triggered by a buggy tor implementation. Fixes bug
  11969. 21293; bugfix on 0.1.1.14-alpha.
  11970. o Minor bugfixes (logging, relay):
  11971. - Remove a forgotten debugging message when an introduction point
  11972. successfully establishes a hidden service prop224 circuit with
  11973. a client.
  11974. - Change three other log_warn() for an introduction point to
  11975. protocol warnings, because they can be failure from the network
  11976. and are not relevant to the operator. Fixes bug 23078; bugfix on
  11977. 0.3.0.1-alpha and 0.3.0.2-alpha.
  11978. o Minor bugfixes (relay):
  11979. - Inform the geoip and rephist modules about all requests, even on
  11980. relays that are only fetching microdescriptors. Fixes a bug
  11981. related to 21585; bugfix on 0.3.0.1-alpha.
  11982. o Minor bugfixes (memory leaks):
  11983. - Fix a small memory leak at exit from the backtrace handler code.
  11984. Fixes bug 21788; bugfix on 0.2.5.2-alpha. Patch from Daniel Pinto.
  11985. - When directory authorities reject a router descriptor due to
  11986. keypinning, free the router descriptor rather than leaking the
  11987. memory. Fixes bug 22370; bugfix on 0.2.7.2-alpha.
  11988. - Fix a small memory leak when validating a configuration that uses
  11989. two or more AF_UNIX sockets for the same port type. Fixes bug
  11990. 23053; bugfix on 0.2.6.3-alpha. This is CID 1415725.
  11991. o Minor bugfixes (process behavior):
  11992. - When exiting because of an error, always exit with a nonzero exit
  11993. status. Previously, we would fail to report an error in our exit
  11994. status in cases related to __OwningControllerProcess failure,
  11995. lockfile contention, and Ed25519 key initialization. Fixes bug
  11996. 22720; bugfix on versions 0.2.1.6-alpha, 0.2.2.28-beta, and
  11997. 0.2.7.2-alpha respectively. Reported by "f55jwk4f"; patch
  11998. from "huyvq".
  11999. o Minor bugfixes (robustness, error handling):
  12000. - Improve our handling of the cases where OpenSSL encounters a
  12001. memory error while encoding keys and certificates. We haven't
  12002. observed these errors in the wild, but if they do happen, we now
  12003. detect and respond better. Fixes bug 19418; bugfix on all versions
  12004. of Tor. Reported by Guido Vranken.
  12005. o Minor bugfixes (testing):
  12006. - Fix an undersized buffer in test-memwipe.c. Fixes bug 23291;
  12007. bugfix on 0.2.7.2-alpha. Found and patched by Ties Stuij.
  12008. - Use unbuffered I/O for utility functions around the
  12009. process_handle_t type. This fixes unit test failures reported on
  12010. OpenBSD and FreeBSD. Fixes bug 21654; bugfix on 0.2.3.1-alpha.
  12011. - Make display of captured unit test log messages consistent. Fixes
  12012. bug 21510; bugfix on 0.2.9.3-alpha.
  12013. - Make test-network.sh always call chutney's test-network.sh.
  12014. Previously, this only worked on systems which had bash installed,
  12015. due to some bash-specific code in the script. Fixes bug 19699;
  12016. bugfix on 0.3.0.4-rc. Follow-up to ticket 21581.
  12017. - Fix a memory leak in the link-handshake/certs_ok_ed25519 test.
  12018. Fixes bug 22803; bugfix on 0.3.0.1-alpha.
  12019. - The unit tests now pass on systems where localhost is misconfigured
  12020. to some IPv4 address other than 127.0.0.1. Fixes bug 6298; bugfix
  12021. on 0.0.9pre2.
  12022. o Minor bugfixes (voting consistency):
  12023. - Reject version numbers with non-numeric prefixes (such as +, -, or
  12024. whitespace). Disallowing whitespace prevents differential version
  12025. parsing between POSIX-based and Windows platforms. Fixes bug 21507
  12026. and part of 21508; bugfix on 0.0.8pre1.
  12027. o Minor bugfixes (Windows service):
  12028. - When running as a Windows service, set the ID of the main thread
  12029. correctly. Failure to do so made us fail to send log messages to
  12030. the controller in 0.2.1.16-rc, slowed down controller event
  12031. delivery in 0.2.7.3-rc and later, and crash with an assertion
  12032. failure in 0.3.1.1-alpha. Fixes bug 23081; bugfix on 0.2.1.6-alpha.
  12033. Patch and diagnosis from "Vort".
  12034. o Minor bugfixes (windows, relay):
  12035. - Resolve "Failure from drain_fd: No error" warnings on Windows
  12036. relays. Fixes bug 21540; bugfix on 0.2.6.3-alpha.
  12037. o Code simplification and refactoring:
  12038. - Break up the 630-line function connection_dir_client_reached_eof()
  12039. into a dozen smaller functions. This change should help
  12040. maintainability and readability of the client directory code.
  12041. - Isolate our use of the openssl headers so that they are only
  12042. included from our crypto wrapper modules, and from tests that
  12043. examine those modules' internals. Closes ticket 21841.
  12044. - Simplify our API to launch directory requests, making it more
  12045. extensible and less error-prone. Now it's easier to add extra
  12046. headers to directory requests. Closes ticket 21646.
  12047. - Our base64 decoding functions no longer overestimate the output
  12048. space that they need when parsing unpadded inputs. Closes
  12049. ticket 17868.
  12050. - Remove unused "ROUTER_ADDED_NOTIFY_GENERATOR" internal value.
  12051. Resolves ticket 22213.
  12052. - The logic that directory caches use to spool request to clients,
  12053. serving them one part at a time so as not to allocate too much
  12054. memory, has been refactored for consistency. Previously there was
  12055. a separate spooling implementation per type of spoolable data. Now
  12056. there is one common spooling implementation, with extensible data
  12057. types. Closes ticket 21651.
  12058. - Tor's compression module now supports multiple backends. Part of
  12059. the implementation for proposal 278; closes ticket 21663.
  12060. o Documentation:
  12061. - Add a manpage description for the key-pinning-journal file. Closes
  12062. ticket 22347.
  12063. - Correctly note that bandwidth accounting values are stored in the
  12064. state file, and the bw_accounting file is now obsolete. Closes
  12065. ticket 16082.
  12066. - Document more of the files in the Tor data directory, including
  12067. cached-extrainfo, secret_onion_key{,_ntor}.old, hidserv-stats,
  12068. approved-routers, sr-random, and diff-cache. Found while fixing
  12069. ticket 22347.
  12070. - Clarify the manpage for the (deprecated) torify script. Closes
  12071. ticket 6892.
  12072. - Clarify the behavior of the KeepAliveIsolateSOCKSAuth sub-option.
  12073. Closes ticket 21873.
  12074. - Correct documentation about the default DataDirectory value.
  12075. Closes ticket 21151.
  12076. - Document the default behavior of NumEntryGuards and
  12077. NumDirectoryGuards correctly. Fixes bug 21715; bugfix
  12078. on 0.3.0.1-alpha.
  12079. - Document key=value pluggable transport arguments for Bridge lines
  12080. in torrc. Fixes bug 20341; bugfix on 0.2.5.1-alpha.
  12081. - Note that bandwidth-limiting options don't affect TCP headers or
  12082. DNS. Closes ticket 17170.
  12083. o Removed features (configuration options, all in ticket 22060):
  12084. - These configuration options are now marked Obsolete, and no longer
  12085. have any effect: AllowInvalidNodes, AllowSingleHopCircuits,
  12086. AllowSingleHopExits, ExcludeSingleHopRelays, FastFirstHopPK,
  12087. TLSECGroup, WarnUnsafeSocks. They were first marked as deprecated
  12088. in 0.2.9.2-alpha and have now been removed. The previous default
  12089. behavior is now always chosen; the previous (less secure) non-
  12090. default behavior is now unavailable.
  12091. - CloseHSClientCircuitsImmediatelyOnTimeout and
  12092. CloseHSServiceRendCircuitsImmediatelyOnTimeout were deprecated in
  12093. 0.2.9.2-alpha and now have been removed. HS circuits never close
  12094. on circuit build timeout; they have a longer timeout period.
  12095. - {Control,DNS,Dir,Socks,Trans,NATD,OR}ListenAddress were deprecated
  12096. in 0.2.9.2-alpha and now have been removed. Use the ORPort option
  12097. (and others) to configure listen-only and advertise-only addresses.
  12098. o Removed features (tools):
  12099. - We've removed the tor-checkkey tool from src/tools. Long ago, we
  12100. used it to help people detect RSA keys that were generated by
  12101. versions of Debian affected by CVE-2008-0166. But those keys have
  12102. been out of circulation for ages, and this tool is no longer
  12103. required. Closes ticket 21842.
  12104. Changes in version 0.3.0.10 - 2017-08-02
  12105. Tor 0.3.0.10 backports a collection of small-to-medium bugfixes
  12106. from the current Tor alpha series. OpenBSD users and TPROXY users
  12107. should upgrade; others are probably okay sticking with 0.3.0.9.
  12108. o Major features (build system, continuous integration, backport from 0.3.1.5-alpha):
  12109. - Tor's repository now includes a Travis Continuous Integration (CI)
  12110. configuration file (.travis.yml). This is meant to help new
  12111. developers and contributors who fork Tor to a Github repository be
  12112. better able to test their changes, and understand what we expect
  12113. to pass. To use this new build feature, you must fork Tor to your
  12114. Github account, then go into the "Integrations" menu in the
  12115. repository settings for your fork and enable Travis, then push
  12116. your changes. Closes ticket 22636.
  12117. o Major bugfixes (linux TPROXY support, backport from 0.3.1.1-alpha):
  12118. - Fix a typo that had prevented TPROXY-based transparent proxying
  12119. from working under Linux. Fixes bug 18100; bugfix on 0.2.6.3-alpha.
  12120. Patch from "d4fq0fQAgoJ".
  12121. o Major bugfixes (openbsd, denial-of-service, backport from 0.3.1.5-alpha):
  12122. - Avoid an assertion failure bug affecting our implementation of
  12123. inet_pton(AF_INET6) on certain OpenBSD systems whose strtol()
  12124. handling of "0xbar" differs from what we had expected. Fixes bug
  12125. 22789; bugfix on 0.2.3.8-alpha. Also tracked as TROVE-2017-007.
  12126. o Minor features (backport from 0.3.1.5-alpha):
  12127. - Update geoip and geoip6 to the July 4 2017 Maxmind GeoLite2
  12128. Country database.
  12129. o Minor bugfixes (bandwidth accounting, backport from 0.3.1.2-alpha):
  12130. - Roll over monthly accounting at the configured hour and minute,
  12131. rather than always at 00:00. Fixes bug 22245; bugfix on 0.0.9rc1.
  12132. Found by Andrey Karpov with PVS-Studio.
  12133. o Minor bugfixes (compilation warnings, backport from 0.3.1.5-alpha):
  12134. - Suppress -Wdouble-promotion warnings with clang 4.0. Fixes bug 22915;
  12135. bugfix on 0.2.8.1-alpha.
  12136. - Fix warnings when building with libscrypt and openssl scrypt
  12137. support on Clang. Fixes bug 22916; bugfix on 0.2.7.2-alpha.
  12138. - When building with certain versions of the mingw C header files,
  12139. avoid float-conversion warnings when calling the C functions
  12140. isfinite(), isnan(), and signbit(). Fixes bug 22801; bugfix
  12141. on 0.2.8.1-alpha.
  12142. o Minor bugfixes (compilation, mingw, backport from 0.3.1.1-alpha):
  12143. - Backport a fix for an "unused variable" warning that appeared
  12144. in some versions of mingw. Fixes bug 22838; bugfix on
  12145. 0.2.8.1-alpha.
  12146. o Minor bugfixes (coverity build support, backport from 0.3.1.5-alpha):
  12147. - Avoid Coverity build warnings related to our BUG() macro. By
  12148. default, Coverity treats BUG() as the Linux kernel does: an
  12149. instant abort(). We need to override that so our BUG() macro
  12150. doesn't prevent Coverity from analyzing functions that use it.
  12151. Fixes bug 23030; bugfix on 0.2.9.1-alpha.
  12152. o Minor bugfixes (directory authority, backport from 0.3.1.1-alpha):
  12153. - When rejecting a router descriptor for running an obsolete version
  12154. of Tor without ntor support, warn about the obsolete tor version,
  12155. not the missing ntor key. Fixes bug 20270; bugfix on 0.2.9.3-alpha.
  12156. o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.1.5-alpha):
  12157. - Avoid a sandbox failure when trying to re-bind to a socket and
  12158. mark it as IPv6-only. Fixes bug 20247; bugfix on 0.2.5.1-alpha.
  12159. o Minor bugfixes (unit tests, backport from 0.3.1.5-alpha)
  12160. - Fix a memory leak in the link-handshake/certs_ok_ed25519 test.
  12161. Fixes bug 22803; bugfix on 0.3.0.1-alpha.
  12162. Changes in version 0.3.0.9 - 2017-06-29
  12163. Tor 0.3.0.9 fixes a path selection bug that would allow a client
  12164. to use a guard that was in the same network family as a chosen exit
  12165. relay. This is a security regression; all clients running earlier
  12166. versions of 0.3.0.x or 0.3.1.x should upgrade to 0.3.0.9 or
  12167. 0.3.1.4-alpha.
  12168. This release also backports several other bugfixes from the 0.3.1.x
  12169. series.
  12170. o Major bugfixes (path selection, security, backport from 0.3.1.4-alpha):
  12171. - When choosing which guard to use for a circuit, avoid the exit's
  12172. family along with the exit itself. Previously, the new guard
  12173. selection logic avoided the exit, but did not consider its family.
  12174. Fixes bug 22753; bugfix on 0.3.0.1-alpha. Tracked as TROVE-2017-
  12175. 006 and CVE-2017-0377.
  12176. o Major bugfixes (entry guards, backport from 0.3.1.1-alpha):
  12177. - Don't block bootstrapping when a primary bridge is offline and we
  12178. can't get its descriptor. Fixes bug 22325; fixes one case of bug
  12179. 21969; bugfix on 0.3.0.3-alpha.
  12180. o Major bugfixes (entry guards, backport from 0.3.1.4-alpha):
  12181. - When starting with an old consensus, do not add new entry guards
  12182. unless the consensus is "reasonably live" (under 1 day old). Fixes
  12183. one root cause of bug 22400; bugfix on 0.3.0.1-alpha.
  12184. o Minor features (geoip):
  12185. - Update geoip and geoip6 to the June 8 2017 Maxmind GeoLite2
  12186. Country database.
  12187. o Minor bugfixes (voting consistency, backport from 0.3.1.1-alpha):
  12188. - Reject version numbers with non-numeric prefixes (such as +, -, or
  12189. whitespace). Disallowing whitespace prevents differential version
  12190. parsing between POSIX-based and Windows platforms. Fixes bug 21507
  12191. and part of 21508; bugfix on 0.0.8pre1.
  12192. o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.1.4-alpha):
  12193. - Permit the fchmod system call, to avoid crashing on startup when
  12194. starting with the seccomp2 sandbox and an unexpected set of
  12195. permissions on the data directory or its contents. Fixes bug
  12196. 22516; bugfix on 0.2.5.4-alpha.
  12197. o Minor bugfixes (defensive programming, backport from 0.3.1.4-alpha):
  12198. - Fix a memset() off the end of an array when packing cells. This
  12199. bug should be harmless in practice, since the corrupted bytes are
  12200. still in the same structure, and are always padding bytes,
  12201. ignored, or immediately overwritten, depending on compiler
  12202. behavior. Nevertheless, because the memset()'s purpose is to make
  12203. sure that any other cell-handling bugs can't expose bytes to the
  12204. network, we need to fix it. Fixes bug 22737; bugfix on
  12205. 0.2.4.11-alpha. Fixes CID 1401591.
  12206. Changes in version 0.3.0.8 - 2017-06-08
  12207. Tor 0.3.0.8 fixes a pair of bugs that would allow an attacker to
  12208. remotely crash a hidden service with an assertion failure. Anyone
  12209. running a hidden service should upgrade to this version, or to some
  12210. other version with fixes for TROVE-2017-004 and TROVE-2017-005.
  12211. Tor 0.3.0.8 also includes fixes for several key management bugs
  12212. that sometimes made relays unreliable, as well as several other
  12213. bugfixes described below.
  12214. o Major bugfixes (hidden service, relay, security, backport
  12215. from 0.3.1.3-alpha):
  12216. - Fix a remotely triggerable assertion failure when a hidden service
  12217. handles a malformed BEGIN cell. Fixes bug 22493, tracked as
  12218. TROVE-2017-004 and as CVE-2017-0375; bugfix on 0.3.0.1-alpha.
  12219. - Fix a remotely triggerable assertion failure caused by receiving a
  12220. BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
  12221. 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
  12222. on 0.2.2.1-alpha.
  12223. o Major bugfixes (relay, link handshake, backport from 0.3.1.3-alpha):
  12224. - When performing the v3 link handshake on a TLS connection, report
  12225. that we have the x509 certificate that we actually used on that
  12226. connection, even if we have changed certificates since that
  12227. connection was first opened. Previously, we would claim to have
  12228. used our most recent x509 link certificate, which would sometimes
  12229. make the link handshake fail. Fixes one case of bug 22460; bugfix
  12230. on 0.2.3.6-alpha.
  12231. o Major bugfixes (relays, key management, backport from 0.3.1.3-alpha):
  12232. - Regenerate link and authentication certificates whenever the key
  12233. that signs them changes; also, regenerate link certificates
  12234. whenever the signed key changes. Previously, these processes were
  12235. only weakly coupled, and we relays could (for minutes to hours)
  12236. wind up with an inconsistent set of keys and certificates, which
  12237. other relays would not accept. Fixes two cases of bug 22460;
  12238. bugfix on 0.3.0.1-alpha.
  12239. - When sending an Ed25519 signing->link certificate in a CERTS cell,
  12240. send the certificate that matches the x509 certificate that we
  12241. used on the TLS connection. Previously, there was a race condition
  12242. if the TLS context rotated after we began the TLS handshake but
  12243. before we sent the CERTS cell. Fixes a case of bug 22460; bugfix
  12244. on 0.3.0.1-alpha.
  12245. o Major bugfixes (hidden service v3, backport from 0.3.1.1-alpha):
  12246. - Stop rejecting v3 hidden service descriptors because their size
  12247. did not match an old padding rule. Fixes bug 22447; bugfix on
  12248. tor-0.3.0.1-alpha.
  12249. o Minor features (fallback directory list, backport from 0.3.1.3-alpha):
  12250. - Replace the 177 fallbacks originally introduced in Tor 0.2.9.8 in
  12251. December 2016 (of which ~126 were still functional) with a list of
  12252. 151 fallbacks (32 new, 119 unchanged, 58 removed) generated in May
  12253. 2017. Resolves ticket 21564.
  12254. o Minor bugfixes (configuration, backport from 0.3.1.1-alpha):
  12255. - Do not crash when starting with LearnCircuitBuildTimeout 0. Fixes
  12256. bug 22252; bugfix on 0.2.9.3-alpha.
  12257. o Minor bugfixes (correctness, backport from 0.3.1.3-alpha):
  12258. - Avoid undefined behavior when parsing IPv6 entries from the geoip6
  12259. file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
  12260. o Minor bugfixes (link handshake, backport from 0.3.1.3-alpha):
  12261. - Lower the lifetime of the RSA->Ed25519 cross-certificate to six
  12262. months, and regenerate it when it is within one month of expiring.
  12263. Previously, we had generated this certificate at startup with a
  12264. ten-year lifetime, but that could lead to weird behavior when Tor
  12265. was started with a grossly inaccurate clock. Mitigates bug 22466;
  12266. mitigation on 0.3.0.1-alpha.
  12267. o Minor bugfixes (memory leak, directory authority, backport from
  12268. 0.3.1.2-alpha):
  12269. - When directory authorities reject a router descriptor due to
  12270. keypinning, free the router descriptor rather than leaking the
  12271. memory. Fixes bug 22370; bugfix on 0.2.7.2-alpha.
  12272. Changes in version 0.2.9.11 - 2017-06-08
  12273. Tor 0.2.9.11 backports a fix for a bug that would allow an attacker to
  12274. remotely crash a hidden service with an assertion failure. Anyone
  12275. running a hidden service should upgrade to this version, or to some
  12276. other version with fixes for TROVE-2017-005. (Versions before 0.3.0
  12277. are not affected by TROVE-2017-004.)
  12278. Tor 0.2.9.11 also backports fixes for several key management bugs
  12279. that sometimes made relays unreliable, as well as several other
  12280. bugfixes described below.
  12281. o Major bugfixes (hidden service, relay, security, backport
  12282. from 0.3.1.3-alpha):
  12283. - Fix a remotely triggerable assertion failure caused by receiving a
  12284. BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
  12285. 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
  12286. on 0.2.2.1-alpha.
  12287. o Major bugfixes (relay, link handshake, backport from 0.3.1.3-alpha):
  12288. - When performing the v3 link handshake on a TLS connection, report
  12289. that we have the x509 certificate that we actually used on that
  12290. connection, even if we have changed certificates since that
  12291. connection was first opened. Previously, we would claim to have
  12292. used our most recent x509 link certificate, which would sometimes
  12293. make the link handshake fail. Fixes one case of bug 22460; bugfix
  12294. on 0.2.3.6-alpha.
  12295. o Minor features (fallback directory list, backport from 0.3.1.3-alpha):
  12296. - Replace the 177 fallbacks originally introduced in Tor 0.2.9.8 in
  12297. December 2016 (of which ~126 were still functional) with a list of
  12298. 151 fallbacks (32 new, 119 unchanged, 58 removed) generated in May
  12299. 2017. Resolves ticket 21564.
  12300. o Minor features (future-proofing, backport from 0.3.0.7):
  12301. - Tor no longer refuses to download microdescriptors or descriptors if
  12302. they are listed as "published in the future". This change will
  12303. eventually allow us to stop listing meaningful "published" dates
  12304. in microdescriptor consensuses, and thereby allow us to reduce the
  12305. resources required to download consensus diffs by over 50%.
  12306. Implements part of ticket 21642; implements part of proposal 275.
  12307. o Minor features (directory authorities, backport from 0.3.0.4-rc)
  12308. - Directory authorities now reject relays running versions
  12309. 0.2.9.1-alpha through 0.2.9.4-alpha, because those relays
  12310. suffer from bug 20499 and don't keep their consensus cache
  12311. up-to-date. Resolves ticket 20509.
  12312. o Minor features (geoip):
  12313. - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
  12314. Country database.
  12315. o Minor bugfixes (control port, backport from 0.3.0.6):
  12316. - The GETINFO extra-info/digest/<digest> command was broken because
  12317. of a wrong base16 decode return value check, introduced when
  12318. refactoring that API. Fixes bug 22034; bugfix on 0.2.9.1-alpha.
  12319. o Minor bugfixes (correctness, backport from 0.3.1.3-alpha):
  12320. - Avoid undefined behavior when parsing IPv6 entries from the geoip6
  12321. file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
  12322. o Minor bugfixes (Linux seccomp2 sandbox, backport from 0.3.0.7):
  12323. - The getpid() system call is now permitted under the Linux seccomp2
  12324. sandbox, to avoid crashing with versions of OpenSSL (and other
  12325. libraries) that attempt to learn the process's PID by using the
  12326. syscall rather than the VDSO code. Fixes bug 21943; bugfix
  12327. on 0.2.5.1-alpha.
  12328. o Minor bugfixes (memory leak, directory authority, backport
  12329. from 0.3.1.2-alpha):
  12330. - When directory authorities reject a router descriptor due to
  12331. keypinning, free the router descriptor rather than leaking the
  12332. memory. Fixes bug 22370; bugfix on 0.2.7.2-alpha.
  12333. Changes in version 0.2.8.14 - 2017-06-08
  12334. Tor 0.2.7.8 backports a fix for a bug that would allow an attacker to
  12335. remotely crash a hidden service with an assertion failure. Anyone
  12336. running a hidden service should upgrade to this version, or to some
  12337. other version with fixes for TROVE-2017-005. (Versions before 0.3.0
  12338. are not affected by TROVE-2017-004.)
  12339. o Major bugfixes (hidden service, relay, security):
  12340. - Fix a remotely triggerable assertion failure caused by receiving a
  12341. BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
  12342. 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
  12343. on 0.2.2.1-alpha.
  12344. o Minor features (geoip):
  12345. - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
  12346. Country database.
  12347. o Minor features (fallback directory list, backport from 0.3.1.3-alpha):
  12348. - Replace the 177 fallbacks originally introduced in Tor 0.2.9.8 in
  12349. December 2016 (of which ~126 were still functional) with a list of
  12350. 151 fallbacks (32 new, 119 unchanged, 58 removed) generated in May
  12351. 2017. Resolves ticket 21564.
  12352. o Minor bugfixes (correctness):
  12353. - Avoid undefined behavior when parsing IPv6 entries from the geoip6
  12354. file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
  12355. Changes in version 0.2.7.8 - 2017-06-08
  12356. Tor 0.2.7.8 backports a fix for a bug that would allow an attacker to
  12357. remotely crash a hidden service with an assertion failure. Anyone
  12358. running a hidden service should upgrade to this version, or to some
  12359. other version with fixes for TROVE-2017-005. (Versions before 0.3.0
  12360. are not affected by TROVE-2017-004.)
  12361. o Major bugfixes (hidden service, relay, security):
  12362. - Fix a remotely triggerable assertion failure caused by receiving a
  12363. BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
  12364. 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
  12365. on 0.2.2.1-alpha.
  12366. o Minor features (geoip):
  12367. - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
  12368. Country database.
  12369. o Minor bugfixes (correctness):
  12370. - Avoid undefined behavior when parsing IPv6 entries from the geoip6
  12371. file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
  12372. Changes in version 0.2.6.12 - 2017-06-08
  12373. Tor 0.2.6.12 backports a fix for a bug that would allow an attacker to
  12374. remotely crash a hidden service with an assertion failure. Anyone
  12375. running a hidden service should upgrade to this version, or to some
  12376. other version with fixes for TROVE-2017-005. (Versions before 0.3.0
  12377. are not affected by TROVE-2017-004.)
  12378. o Major bugfixes (hidden service, relay, security):
  12379. - Fix a remotely triggerable assertion failure caused by receiving a
  12380. BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
  12381. 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
  12382. on 0.2.2.1-alpha.
  12383. o Minor features (geoip):
  12384. - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
  12385. Country database.
  12386. o Minor bugfixes (correctness):
  12387. - Avoid undefined behavior when parsing IPv6 entries from the geoip6
  12388. file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
  12389. Changes in version 0.2.5.14 - 2017-06-08
  12390. Tor 0.2.5.14 backports a fix for a bug that would allow an attacker to
  12391. remotely crash a hidden service with an assertion failure. Anyone
  12392. running a hidden service should upgrade to this version, or to some
  12393. other version with fixes for TROVE-2017-005. (Versions before 0.3.0
  12394. are not affected by TROVE-2017-004.)
  12395. o Major bugfixes (hidden service, relay, security):
  12396. - Fix a remotely triggerable assertion failure caused by receiving a
  12397. BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
  12398. 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
  12399. on 0.2.2.1-alpha.
  12400. o Minor features (geoip):
  12401. - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
  12402. Country database.
  12403. o Minor bugfixes (correctness):
  12404. - Avoid undefined behavior when parsing IPv6 entries from the geoip6
  12405. file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
  12406. Changes in version 0.2.4.29 - 2017-06-08
  12407. Tor 0.2.4.29 backports a fix for a bug that would allow an attacker to
  12408. remotely crash a hidden service with an assertion failure. Anyone
  12409. running a hidden service should upgrade to this version, or to some
  12410. other version with fixes for TROVE-2017-005. (Versions before 0.3.0
  12411. are not affected by TROVE-2017-004.)
  12412. o Major bugfixes (hidden service, relay, security):
  12413. - Fix a remotely triggerable assertion failure caused by receiving a
  12414. BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
  12415. 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
  12416. on 0.2.2.1-alpha.
  12417. o Minor features (geoip):
  12418. - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
  12419. Country database.
  12420. o Minor bugfixes (correctness):
  12421. - Avoid undefined behavior when parsing IPv6 entries from the geoip6
  12422. file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
  12423. Changes in version 0.3.0.7 - 2017-05-15
  12424. Tor 0.3.0.7 fixes a medium-severity security bug in earlier versions
  12425. of Tor 0.3.0.x, where an attacker could cause a Tor relay process
  12426. to exit. Relays running earlier versions of Tor 0.3.0.x should upgrade;
  12427. clients are not affected.
  12428. o Major bugfixes (hidden service directory, security):
  12429. - Fix an assertion failure in the hidden service directory code, which
  12430. could be used by an attacker to remotely cause a Tor relay process to
  12431. exit. Relays running earlier versions of Tor 0.3.0.x should upgrade.
  12432. should upgrade. This security issue is tracked as TROVE-2017-002.
  12433. Fixes bug 22246; bugfix on 0.3.0.1-alpha.
  12434. o Minor features:
  12435. - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
  12436. Country database.
  12437. o Minor features (future-proofing):
  12438. - Tor no longer refuses to download microdescriptors or descriptors
  12439. if they are listed as "published in the future". This change will
  12440. eventually allow us to stop listing meaningful "published" dates
  12441. in microdescriptor consensuses, and thereby allow us to reduce the
  12442. resources required to download consensus diffs by over 50%.
  12443. Implements part of ticket 21642; implements part of proposal 275.
  12444. o Minor bugfixes (Linux seccomp2 sandbox):
  12445. - The getpid() system call is now permitted under the Linux seccomp2
  12446. sandbox, to avoid crashing with versions of OpenSSL (and other
  12447. libraries) that attempt to learn the process's PID by using the
  12448. syscall rather than the VDSO code. Fixes bug 21943; bugfix
  12449. on 0.2.5.1-alpha.
  12450. Changes in version 0.3.0.6 - 2017-04-26
  12451. Tor 0.3.0.6 is the first stable release of the Tor 0.3.0 series.
  12452. With the 0.3.0 series, clients and relays now use Ed25519 keys to
  12453. authenticate their link connections to relays, rather than the old
  12454. RSA1024 keys that they used before. (Circuit crypto has been
  12455. Curve25519-authenticated since 0.2.4.8-alpha.) We have also replaced
  12456. the guard selection and replacement algorithm to behave more robustly
  12457. in the presence of unreliable networks, and to resist guard-
  12458. capture attacks.
  12459. This series also includes numerous other small features and bugfixes,
  12460. along with more groundwork for the upcoming hidden-services revamp.
  12461. Per our stable release policy, we plan to support the Tor 0.3.0
  12462. release series for at least the next nine months, or for three months
  12463. after the first stable release of the 0.3.1 series: whichever is
  12464. longer. If you need a release with long-term support, we recommend
  12465. that you stay with the 0.2.9 series.
  12466. Below are the changes since 0.2.9.10. For a list of only the changes
  12467. since 0.3.0.5-rc, see the ChangeLog file.
  12468. o Major features (directory authority, security):
  12469. - The default for AuthDirPinKeys is now 1: directory authorities
  12470. will reject relays where the RSA identity key matches a previously
  12471. seen value, but the Ed25519 key has changed. Closes ticket 18319.
  12472. o Major features (guard selection algorithm):
  12473. - Tor's guard selection algorithm has been redesigned from the
  12474. ground up, to better support unreliable networks and restrictive
  12475. sets of entry nodes, and to better resist guard-capture attacks by
  12476. hostile local networks. Implements proposal 271; closes
  12477. ticket 19877.
  12478. o Major features (next-generation hidden services):
  12479. - Relays can now handle v3 ESTABLISH_INTRO cells as specified by
  12480. prop224 aka "Next Generation Hidden Services". Service and clients
  12481. don't use this functionality yet. Closes ticket 19043. Based on
  12482. initial code by Alec Heifetz.
  12483. - Relays now support the HSDir version 3 protocol, so that they can
  12484. can store and serve v3 descriptors. This is part of the next-
  12485. generation onion service work detailed in proposal 224. Closes
  12486. ticket 17238.
  12487. o Major features (protocol, ed25519 identity keys):
  12488. - Clients now support including Ed25519 identity keys in the EXTEND2
  12489. cells they generate. By default, this is controlled by a consensus
  12490. parameter, currently disabled. You can turn this feature on for
  12491. testing by setting ExtendByEd25519ID in your configuration. This
  12492. might make your traffic appear different than the traffic
  12493. generated by other users, however. Implements part of ticket
  12494. 15056; part of proposal 220.
  12495. - Relays now understand requests to extend to other relays by their
  12496. Ed25519 identity keys. When an Ed25519 identity key is included in
  12497. an EXTEND2 cell, the relay will only extend the circuit if the
  12498. other relay can prove ownership of that identity. Implements part
  12499. of ticket 15056; part of proposal 220.
  12500. - Relays now use Ed25519 to prove their Ed25519 identities and to
  12501. one another, and to clients. This algorithm is faster and more
  12502. secure than the RSA-based handshake we've been doing until now.
  12503. Implements the second big part of proposal 220; Closes
  12504. ticket 15055.
  12505. o Major features (security):
  12506. - Change the algorithm used to decide DNS TTLs on client and server
  12507. side, to better resist DNS-based correlation attacks like the
  12508. DefecTor attack of Greschbach, Pulls, Roberts, Winter, and
  12509. Feamster. Now relays only return one of two possible DNS TTL
  12510. values, and clients are willing to believe DNS TTL values up to 3
  12511. hours long. Closes ticket 19769.
  12512. o Major bugfixes (client, onion service, also in 0.2.9.9):
  12513. - Fix a client-side onion service reachability bug, where multiple
  12514. socks requests to an onion service (or a single slow request)
  12515. could cause us to mistakenly mark some of the service's
  12516. introduction points as failed, and we cache that failure so
  12517. eventually we run out and can't reach the service. Also resolves a
  12518. mysterious "Remote server sent bogus reason code 65021" log
  12519. warning. The bug was introduced in ticket 17218, where we tried to
  12520. remember the circuit end reason as a uint16_t, which mangled
  12521. negative values. Partially fixes bug 21056 and fixes bug 20307;
  12522. bugfix on 0.2.8.1-alpha.
  12523. o Major bugfixes (crash, directory connections):
  12524. - Fix a rare crash when sending a begin cell on a circuit whose
  12525. linked directory connection had already been closed. Fixes bug
  12526. 21576; bugfix on 0.2.9.3-alpha. Reported by Alec Muffett.
  12527. o Major bugfixes (directory authority):
  12528. - During voting, when marking a relay as a probable sybil, do not
  12529. clear its BadExit flag: sybils can still be bad in other ways
  12530. too. (We still clear the other flags.) Fixes bug 21108; bugfix
  12531. on 0.2.0.13-alpha.
  12532. o Major bugfixes (DNS):
  12533. - Fix a bug that prevented exit nodes from caching DNS records for
  12534. more than 60 seconds. Fixes bug 19025; bugfix on 0.2.4.7-alpha.
  12535. o Major bugfixes (IPv6 Exits):
  12536. - Stop rejecting all IPv6 traffic on Exits whose exit policy rejects
  12537. any IPv6 addresses. Instead, only reject a port over IPv6 if the
  12538. exit policy rejects that port on more than an IPv6 /16 of
  12539. addresses. This bug was made worse by 17027 in 0.2.8.1-alpha,
  12540. which rejected a relay's own IPv6 address by default. Fixes bug
  12541. 21357; bugfix on commit 004f3f4e53 in 0.2.4.7-alpha.
  12542. o Major bugfixes (parsing):
  12543. - Fix an integer underflow bug when comparing malformed Tor
  12544. versions. This bug could crash Tor when built with
  12545. --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
  12546. 0.2.9.8, which were built with -ftrapv by default. In other cases
  12547. it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
  12548. on 0.0.8pre1. Found by OSS-Fuzz.
  12549. - When parsing a malformed content-length field from an HTTP
  12550. message, do not read off the end of the buffer. This bug was a
  12551. potential remote denial-of-service attack against Tor clients and
  12552. relays. A workaround was released in October 2016, to prevent this
  12553. bug from crashing Tor. This is a fix for the underlying issue,
  12554. which should no longer matter (if you applied the earlier patch).
  12555. Fixes bug 20894; bugfix on 0.2.0.16-alpha. Bug found by fuzzing
  12556. using AFL (http://lcamtuf.coredump.cx/afl/).
  12557. o Major bugfixes (scheduler):
  12558. - Actually compare circuit policies in ewma_cmp_cmux(). This bug
  12559. caused the channel scheduler to behave more or less randomly,
  12560. rather than preferring channels with higher-priority circuits.
  12561. Fixes bug 20459; bugfix on 0.2.6.2-alpha.
  12562. o Major bugfixes (security, also in 0.2.9.9):
  12563. - Downgrade the "-ftrapv" option from "always on" to "only on when
  12564. --enable-expensive-hardening is provided." This hardening option,
  12565. like others, can turn survivable bugs into crashes--and having it
  12566. on by default made a (relatively harmless) integer overflow bug
  12567. into a denial-of-service bug. Fixes bug 21278 (TROVE-2017-001);
  12568. bugfix on 0.2.9.1-alpha.
  12569. o Minor feature (client):
  12570. - Enable IPv6 traffic on the SocksPort by default. To disable this,
  12571. a user will have to specify "NoIPv6Traffic". Closes ticket 21269.
  12572. o Minor feature (fallback scripts):
  12573. - Add a check_existing mode to updateFallbackDirs.py, which checks
  12574. if fallbacks in the hard-coded list are working. Closes ticket
  12575. 20174. Patch by haxxpop.
  12576. o Minor feature (protocol versioning):
  12577. - Add new protocol version for proposal 224. HSIntro now advertises
  12578. version "3-4" and HSDir version "1-2". Fixes ticket 20656.
  12579. o Minor features (ciphersuite selection):
  12580. - Allow relays to accept a wider range of ciphersuites, including
  12581. chacha20-poly1305 and AES-CCM. Closes the other part of 15426.
  12582. - Clients now advertise a list of ciphersuites closer to the ones
  12583. preferred by Firefox. Closes part of ticket 15426.
  12584. o Minor features (controller):
  12585. - Add "GETINFO sr/current" and "GETINFO sr/previous" keys, to expose
  12586. shared-random values to the controller. Closes ticket 19925.
  12587. - When HSFETCH arguments cannot be parsed, say "Invalid argument"
  12588. rather than "unrecognized." Closes ticket 20389; patch from
  12589. Ivan Markin.
  12590. o Minor features (controller, configuration):
  12591. - Each of the *Port options, such as SocksPort, ORPort, ControlPort,
  12592. and so on, now comes with a __*Port variant that will not be saved
  12593. to the torrc file by the controller's SAVECONF command. This
  12594. change allows TorBrowser to set up a single-use domain socket for
  12595. each time it launches Tor. Closes ticket 20956.
  12596. - The GETCONF command can now query options that may only be
  12597. meaningful in context-sensitive lists. This allows the controller
  12598. to query the mixed SocksPort/__SocksPort style options introduced
  12599. in feature 20956. Implements ticket 21300.
  12600. o Minor features (diagnostic, directory client):
  12601. - Warn when we find an unexpected inconsistency in directory
  12602. download status objects. Prevents some negative consequences of
  12603. bug 20593.
  12604. o Minor features (directory authorities):
  12605. - Directory authorities now reject descriptors that claim to be
  12606. malformed versions of Tor. Helps prevent exploitation of
  12607. bug 21278.
  12608. - Reject version numbers with components that exceed INT32_MAX.
  12609. Otherwise 32-bit and 64-bit platforms would behave inconsistently.
  12610. Fixes bug 21450; bugfix on 0.0.8pre1.
  12611. o Minor features (directory authority):
  12612. - Add a new authority-only AuthDirTestEd25519LinkKeys option (on by
  12613. default) to control whether authorities should try to probe relays
  12614. by their Ed25519 link keys. This option will go away in a few
  12615. releases--unless we encounter major trouble in our ed25519 link
  12616. protocol rollout, in which case it will serve as a safety option.
  12617. o Minor features (directory cache):
  12618. - Relays and bridges will now refuse to serve the consensus they
  12619. have if they know it is too old for a client to use. Closes
  12620. ticket 20511.
  12621. o Minor features (ed25519 link handshake):
  12622. - Advertise support for the ed25519 link handshake using the
  12623. subprotocol-versions mechanism, so that clients can tell which
  12624. relays can identity themselves by Ed25519 ID. Closes ticket 20552.
  12625. o Minor features (entry guards):
  12626. - Add UseEntryGuards to TEST_OPTIONS_DEFAULT_VALUES in order to not
  12627. break regression tests.
  12628. - Require UseEntryGuards when UseBridges is set, in order to make
  12629. sure bridges aren't bypassed. Resolves ticket 20502.
  12630. o Minor features (fallback directories):
  12631. - Allow 3 fallback relays per operator, which is safe now that we
  12632. are choosing 200 fallback relays. Closes ticket 20912.
  12633. - Annotate updateFallbackDirs.py with the bandwidth and consensus
  12634. weight for each candidate fallback. Closes ticket 20878.
  12635. - Display the relay fingerprint when downloading consensuses from
  12636. fallbacks. Closes ticket 20908.
  12637. - Exclude relays affected by bug 20499 from the fallback list.
  12638. Exclude relays from the fallback list if they are running versions
  12639. known to be affected by bug 20499, or if in our tests they deliver
  12640. a stale consensus (i.e. one that expired more than 24 hours ago).
  12641. Closes ticket 20539.
  12642. - Make it easier to change the output sort order of fallbacks.
  12643. Closes ticket 20822.
  12644. - Reduce the minimum fallback bandwidth to 1 MByte/s. Part of
  12645. ticket 18828.
  12646. - Require fallback directories to have the same address and port for
  12647. 7 days (now that we have enough relays with this stability).
  12648. Relays whose OnionOO stability timer is reset on restart by bug
  12649. 18050 should upgrade to Tor 0.2.8.7 or later, which has a fix for
  12650. this issue. Closes ticket 20880; maintains short-term fix
  12651. in 0.2.8.2-alpha.
  12652. - Require fallbacks to have flags for 90% of the time (weighted
  12653. decaying average), rather than 95%. This allows at least 73% of
  12654. clients to bootstrap in the first 5 seconds without contacting an
  12655. authority. Part of ticket 18828.
  12656. - Select 200 fallback directories for each release. Closes
  12657. ticket 20881.
  12658. o Minor features (fingerprinting resistance, authentication):
  12659. - Extend the length of RSA keys used for TLS link authentication to
  12660. 2048 bits. (These weren't used for forward secrecy; for forward
  12661. secrecy, we used P256.) Closes ticket 13752.
  12662. o Minor features (geoip):
  12663. - Update geoip and geoip6 to the April 4 2017 Maxmind GeoLite2
  12664. Country database.
  12665. o Minor features (geoip, also in 0.2.9.9):
  12666. - Update geoip and geoip6 to the January 4 2017 Maxmind GeoLite2
  12667. Country database.
  12668. o Minor features (infrastructure):
  12669. - Implement smartlist_add_strdup() function. Replaces the use of
  12670. smartlist_add(sl, tor_strdup(str)). Closes ticket 20048.
  12671. o Minor features (linting):
  12672. - Enhance the changes file linter to warn on Tor versions that are
  12673. prefixed with "tor-". Closes ticket 21096.
  12674. o Minor features (logging):
  12675. - In several places, describe unset ed25519 keys as "<unset>",
  12676. rather than the scary "AAAAAAAA...AAA". Closes ticket 21037.
  12677. o Minor features (portability, compilation):
  12678. - Autoconf now checks to determine if OpenSSL structures are opaque,
  12679. instead of explicitly checking for OpenSSL version numbers. Part
  12680. of ticket 21359.
  12681. - Support building with recent LibreSSL code that uses opaque
  12682. structures. Closes ticket 21359.
  12683. o Minor features (relay):
  12684. - We now allow separation of exit and relay traffic to different
  12685. source IP addresses, using the OutboundBindAddressExit and
  12686. OutboundBindAddressOR options respectively. Closes ticket 17975.
  12687. Written by Michael Sonntag.
  12688. o Minor features (reliability, crash):
  12689. - Try better to detect problems in buffers where they might grow (or
  12690. think they have grown) over 2 GB in size. Diagnostic for
  12691. bug 21369.
  12692. o Minor features (testing):
  12693. - During 'make test-network-all', if tor logs any warnings, ask
  12694. chutney to output them. Requires a recent version of chutney with
  12695. the 21572 patch. Implements 21570.
  12696. o Minor bugfix (control protocol):
  12697. - The reply to a "GETINFO config/names" request via the control
  12698. protocol now spells the type "Dependent" correctly. This is a
  12699. breaking change in the control protocol. (The field seems to be
  12700. ignored by the most common known controllers.) Fixes bug 18146;
  12701. bugfix on 0.1.1.4-alpha.
  12702. - The GETINFO extra-info/digest/<digest> command was broken because
  12703. of a wrong base16 decode return value check, introduced when
  12704. refactoring that API. Fixes bug 22034; bugfix on 0.2.9.1-alpha.
  12705. o Minor bugfix (logging):
  12706. - Don't recommend the use of Tor2web in non-anonymous mode.
  12707. Recommending Tor2web is a bad idea because the client loses all
  12708. anonymity. Tor2web should only be used in specific cases by users
  12709. who *know* and understand the issues. Fixes bug 21294; bugfix
  12710. on 0.2.9.3-alpha.
  12711. o Minor bugfixes (bug resilience):
  12712. - Fix an unreachable size_t overflow in base64_decode(). Fixes bug
  12713. 19222; bugfix on 0.2.0.9-alpha. Found by Guido Vranken; fixed by
  12714. Hans Jerry Illikainen.
  12715. o Minor bugfixes (build):
  12716. - Replace obsolete Autoconf macros with their modern equivalent and
  12717. prevent similar issues in the future. Fixes bug 20990; bugfix
  12718. on 0.1.0.1-rc.
  12719. o Minor bugfixes (certificate expiration time):
  12720. - Avoid using link certificates that don't become valid till some
  12721. time in the future. Fixes bug 21420; bugfix on 0.2.4.11-alpha
  12722. o Minor bugfixes (client):
  12723. - Always recover from failures in extend_info_from_node(), in an
  12724. attempt to prevent any recurrence of bug 21242. Fixes bug 21372;
  12725. bugfix on 0.2.3.1-alpha.
  12726. - When clients that use bridges start up with a cached consensus on
  12727. disk, they were ignoring it and downloading a new one. Now they
  12728. use the cached one. Fixes bug 20269; bugfix on 0.2.3.12-alpha.
  12729. o Minor bugfixes (code correctness):
  12730. - Repair a couple of (unreachable or harmless) cases of the risky
  12731. comparison-by-subtraction pattern that caused bug 21278.
  12732. o Minor bugfixes (config):
  12733. - Don't assert on startup when trying to get the options list and
  12734. LearnCircuitBuildTimeout is set to 0: we are currently parsing the
  12735. options so of course they aren't ready yet. Fixes bug 21062;
  12736. bugfix on 0.2.9.3-alpha.
  12737. o Minor bugfixes (configuration):
  12738. - Accept non-space whitespace characters after the severity level in
  12739. the `Log` option. Fixes bug 19965; bugfix on 0.2.1.1-alpha.
  12740. - Support "TByte" and "TBytes" units in options given in bytes.
  12741. "TB", "terabyte(s)", "TBit(s)" and "terabit(s)" were already
  12742. supported. Fixes bug 20622; bugfix on 0.2.0.14-alpha.
  12743. o Minor bugfixes (configure, autoconf):
  12744. - Rename the configure option --enable-expensive-hardening to
  12745. --enable-fragile-hardening. Expensive hardening makes the tor
  12746. daemon abort when some kinds of issues are detected. Thus, it
  12747. makes tor more at risk of remote crashes but safer against RCE or
  12748. heartbleed bug category. We now try to explain this issue in a
  12749. message from the configure script. Fixes bug 21290; bugfix
  12750. on 0.2.5.4-alpha.
  12751. o Minor bugfixes (consensus weight):
  12752. - Add new consensus method that initializes bw weights to 1 instead
  12753. of 0. This prevents a zero weight from making it all the way to
  12754. the end (happens in small testing networks) and causing an error.
  12755. Fixes bug 14881; bugfix on 0.2.2.17-alpha.
  12756. o Minor bugfixes (crash prevention):
  12757. - Fix an (currently untriggerable, but potentially dangerous) crash
  12758. bug when base32-encoding inputs whose sizes are not a multiple of
  12759. 5. Fixes bug 21894; bugfix on 0.2.9.1-alpha.
  12760. o Minor bugfixes (dead code):
  12761. - Remove a redundant check for PidFile changes at runtime in
  12762. options_transition_allowed(): this check is already performed
  12763. regardless of whether the sandbox is active. Fixes bug 21123;
  12764. bugfix on 0.2.5.4-alpha.
  12765. o Minor bugfixes (descriptors):
  12766. - Correctly recognise downloaded full descriptors as valid, even
  12767. when using microdescriptors as circuits. This affects clients with
  12768. FetchUselessDescriptors set, and may affect directory authorities.
  12769. Fixes bug 20839; bugfix on 0.2.3.2-alpha.
  12770. o Minor bugfixes (directory mirrors):
  12771. - Allow relays to use directory mirrors without a DirPort: these
  12772. relays need to be contacted over their ORPorts using a begindir
  12773. connection. Fixes one case of bug 20711; bugfix on 0.2.8.2-alpha.
  12774. - Clarify the message logged when a remote relay is unexpectedly
  12775. missing an ORPort or DirPort: users were confusing this with a
  12776. local port. Fixes another case of bug 20711; bugfix
  12777. on 0.2.8.2-alpha.
  12778. o Minor bugfixes (directory system):
  12779. - Bridges and relays now use microdescriptors (like clients do)
  12780. rather than old-style router descriptors. Now bridges will blend
  12781. in with clients in terms of the circuits they build. Fixes bug
  12782. 6769; bugfix on 0.2.3.2-alpha.
  12783. - Download all consensus flavors, descriptors, and authority
  12784. certificates when FetchUselessDescriptors is set, regardless of
  12785. whether tor is a directory cache or not. Fixes bug 20667; bugfix
  12786. on all recent tor versions.
  12787. o Minor bugfixes (documentation):
  12788. - Update the tor manual page to document every option that can not
  12789. be changed while tor is running. Fixes bug 21122.
  12790. o Minor bugfixes (ed25519 certificates):
  12791. - Correctly interpret ed25519 certificates that would expire some
  12792. time after 19 Jan 2038. Fixes bug 20027; bugfix on 0.2.7.2-alpha.
  12793. o Minor bugfixes (fallback directories):
  12794. - Avoid checking fallback candidates' DirPorts if they are down in
  12795. OnionOO. When a relay operator has multiple relays, this
  12796. prioritizes relays that are up over relays that are down. Fixes
  12797. bug 20926; bugfix on 0.2.8.3-alpha.
  12798. - Stop failing when OUTPUT_COMMENTS is True in updateFallbackDirs.py.
  12799. Fixes bug 20877; bugfix on 0.2.8.3-alpha.
  12800. - Stop failing when a relay has no uptime data in
  12801. updateFallbackDirs.py. Fixes bug 20945; bugfix on 0.2.8.1-alpha.
  12802. o Minor bugfixes (hidden service):
  12803. - Clean up the code for expiring intro points with no associated
  12804. circuits. It was causing, rarely, a service with some expiring
  12805. introduction points to not open enough additional introduction
  12806. points. Fixes part of bug 21302; bugfix on 0.2.7.2-alpha.
  12807. - Resolve two possible underflows which could lead to creating and
  12808. closing a lot of introduction point circuits in a non-stop loop.
  12809. Fixes bug 21302; bugfix on 0.2.7.2-alpha.
  12810. - Stop setting the torrc option HiddenServiceStatistics to "0" just
  12811. because we're not a bridge or relay. Instead, we preserve whatever
  12812. value the user set (or didn't set). Fixes bug 21150; bugfix
  12813. on 0.2.6.2-alpha.
  12814. o Minor bugfixes (hidden services):
  12815. - Make hidden services check for failed intro point connections,
  12816. even when they have exceeded their intro point creation limit.
  12817. Fixes bug 21596; bugfix on 0.2.7.2-alpha. Reported by Alec Muffett.
  12818. - Make hidden services with 8 to 10 introduction points check for
  12819. failed circuits immediately after startup. Previously, they would
  12820. wait for 5 minutes before performing their first checks. Fixes bug
  12821. 21594; bugfix on 0.2.3.9-alpha. Reported by Alec Muffett.
  12822. - Stop ignoring misconfigured hidden services. Instead, refuse to
  12823. start tor until the misconfigurations have been corrected. Fixes
  12824. bug 20559; bugfix on multiple commits in 0.2.7.1-alpha
  12825. and earlier.
  12826. o Minor bugfixes (IPv6):
  12827. - Make IPv6-using clients try harder to find an IPv6 directory
  12828. server. Fixes bug 20999; bugfix on 0.2.8.2-alpha.
  12829. - When IPv6 addresses have not been downloaded yet (microdesc
  12830. consensus documents don't list relay IPv6 addresses), use hard-
  12831. coded addresses for authorities, fallbacks, and configured
  12832. bridges. Now IPv6-only clients can use microdescriptors. Fixes bug
  12833. 20996; bugfix on b167e82 from 19608 in 0.2.8.5-alpha.
  12834. o Minor bugfixes (memory leak at exit):
  12835. - Fix a small harmless memory leak at exit of the previously unused
  12836. RSA->Ed identity cross-certificate. Fixes bug 17779; bugfix
  12837. on 0.2.7.2-alpha.
  12838. o Minor bugfixes (onion services):
  12839. - Allow the number of introduction points to be as low as 0, rather
  12840. than as low as 3. Fixes bug 21033; bugfix on 0.2.7.2-alpha.
  12841. o Minor bugfixes (portability):
  12842. - Use "OpenBSD" compiler macro instead of "OPENBSD" or "__OpenBSD__".
  12843. It is supported by OpenBSD itself, and also by most OpenBSD
  12844. variants (such as Bitrig). Fixes bug 20980; bugfix
  12845. on 0.1.2.1-alpha.
  12846. o Minor bugfixes (portability, also in 0.2.9.9):
  12847. - Avoid crashing when Tor is built using headers that contain
  12848. CLOCK_MONOTONIC_COARSE, but then tries to run on an older kernel
  12849. without CLOCK_MONOTONIC_COARSE. Fixes bug 21035; bugfix
  12850. on 0.2.9.1-alpha.
  12851. - Fix Libevent detection on platforms without Libevent 1 headers
  12852. installed. Fixes bug 21051; bugfix on 0.2.9.1-alpha.
  12853. o Minor bugfixes (relay):
  12854. - Avoid a double-marked-circuit warning that could happen when we
  12855. receive DESTROY cells under heavy load. Fixes bug 20059; bugfix
  12856. on 0.1.0.1-rc.
  12857. - Honor DataDirectoryGroupReadable when tor is a relay. Previously,
  12858. initializing the keys would reset the DataDirectory to 0700
  12859. instead of 0750 even if DataDirectoryGroupReadable was set to 1.
  12860. Fixes bug 19953; bugfix on 0.0.2pre16. Patch by "redfish".
  12861. o Minor bugfixes (testing):
  12862. - Fix Raspbian build issues related to missing socket errno in
  12863. test_util.c. Fixes bug 21116; bugfix on 0.2.8.2. Patch by "hein".
  12864. - Remove undefined behavior from the backtrace generator by removing
  12865. its signal handler. Fixes bug 21026; bugfix on 0.2.5.2-alpha.
  12866. - Use bash in src/test/test-network.sh. This ensures we reliably
  12867. call chutney's newer tools/test-network.sh when available. Fixes
  12868. bug 21562; bugfix on 0.2.9.1-alpha.
  12869. o Minor bugfixes (tor-resolve):
  12870. - The tor-resolve command line tool now rejects hostnames over 255
  12871. characters in length. Previously, it would silently truncate them,
  12872. which could lead to bugs. Fixes bug 21280; bugfix on 0.0.9pre5.
  12873. Patch by "junglefowl".
  12874. o Minor bugfixes (unit tests):
  12875. - Allow the unit tests to pass even when DNS lookups of bogus
  12876. addresses do not fail as expected. Fixes bug 20862 and 20863;
  12877. bugfix on unit tests introduced in 0.2.8.1-alpha
  12878. through 0.2.9.4-alpha.
  12879. o Minor bugfixes (util):
  12880. - When finishing writing a file to disk, if we were about to replace
  12881. the file with the temporary file created before and we fail to
  12882. replace it, remove the temporary file so it doesn't stay on disk.
  12883. Fixes bug 20646; bugfix on 0.2.0.7-alpha. Patch by fk.
  12884. o Minor bugfixes (Windows services):
  12885. - Be sure to initialize the monotonic time subsystem before using
  12886. it, even when running as an NT service. Fixes bug 21356; bugfix
  12887. on 0.2.9.1-alpha.
  12888. o Minor bugfixes (Windows):
  12889. - Check for getpagesize before using it to mmap files. This fixes
  12890. compilation in some MinGW environments. Fixes bug 20530; bugfix on
  12891. 0.1.2.1-alpha. Reported by "ice".
  12892. o Code simplification and refactoring:
  12893. - Abolish all global guard context in entrynodes.c; replace with new
  12894. guard_selection_t structure as preparation for proposal 271.
  12895. Closes ticket 19858.
  12896. - Extract magic numbers in circuituse.c into defined variables.
  12897. - Introduce rend_service_is_ephemeral() that tells if given onion
  12898. service is ephemeral. Replace unclear NULL-checkings for service
  12899. directory with this function. Closes ticket 20526.
  12900. - Refactor circuit_is_available_for_use to remove unnecessary check.
  12901. - Refactor circuit_predict_and_launch_new for readability and
  12902. testability. Closes ticket 18873.
  12903. - Refactor code to manipulate global_origin_circuit_list into
  12904. separate functions. Closes ticket 20921.
  12905. - Refactor large if statement in purpose_needs_anonymity to use
  12906. switch statement instead. Closes part of ticket 20077.
  12907. - Refactor the hashing API to return negative values for errors, as
  12908. is done as throughout the codebase. Closes ticket 20717.
  12909. - Remove data structures that were used to index or_connection
  12910. objects by their RSA identity digests. These structures are fully
  12911. redundant with the similar structures used in the
  12912. channel abstraction.
  12913. - Remove duplicate code in the channel_write_*cell() functions.
  12914. Closes ticket 13827; patch from Pingl.
  12915. - Remove redundant behavior of is_sensitive_dir_purpose, refactor to
  12916. use only purpose_needs_anonymity. Closes part of ticket 20077.
  12917. - The code to generate and parse EXTEND and EXTEND2 cells has been
  12918. replaced with code automatically generated by the
  12919. "trunnel" utility.
  12920. o Documentation (formatting):
  12921. - Clean up formatting of tor.1 man page and HTML doc, where <pre>
  12922. blocks were incorrectly appearing. Closes ticket 20885.
  12923. o Documentation (man page):
  12924. - Clarify many options in tor.1 and add some min/max values for
  12925. HiddenService options. Closes ticket 21058.
  12926. o Documentation:
  12927. - Change '1' to 'weight_scale' in consensus bw weights calculation
  12928. comments, as that is reality. Closes ticket 20273. Patch
  12929. from pastly.
  12930. - Clarify that when ClientRejectInternalAddresses is enabled (which
  12931. is the default), multicast DNS hostnames for machines on the local
  12932. network (of the form *.local) are also rejected. Closes
  12933. ticket 17070.
  12934. - Correct the value for AuthDirGuardBWGuarantee in the manpage, from
  12935. 250 KBytes to 2 MBytes. Fixes bug 20435; bugfix on 0.2.5.6-alpha.
  12936. - Include the "TBits" unit in Tor's man page. Fixes part of bug
  12937. 20622; bugfix on 0.2.5.1-alpha.
  12938. - Small fixes to the fuzzing documentation. Closes ticket 21472.
  12939. - Stop the man page from incorrectly stating that HiddenServiceDir
  12940. must already exist. Fixes 20486.
  12941. - Update the description of the directory server options in the
  12942. manual page, to clarify that a relay no longer needs to set
  12943. DirPort in order to be a directory cache. Closes ticket 21720.
  12944. o Removed features:
  12945. - The AuthDirMaxServersPerAuthAddr option no longer exists: The same
  12946. limit for relays running on a single IP applies to authority IP
  12947. addresses as well as to non-authority IP addresses. Closes
  12948. ticket 20960.
  12949. - The UseDirectoryGuards torrc option no longer exists: all users
  12950. that use entry guards will also use directory guards. Related to
  12951. proposal 271; implements part of ticket 20831.
  12952. o Testing:
  12953. - Add tests for networkstatus_compute_bw_weights_v10.
  12954. - Add unit tests circuit_predict_and_launch_new.
  12955. - Extract dummy_origin_circuit_new so it can be used by other
  12956. test functions.
  12957. - New unit tests for tor_htonll(). Closes ticket 19563. Patch
  12958. from "overcaffeinated".
  12959. - Perform the coding style checks when running the tests and fail
  12960. when coding style violations are found. Closes ticket 5500.
  12961. Changes in version 0.2.8.13 - 2017-03-03
  12962. Tor 0.2.8.13 backports a security fix from later Tor
  12963. releases. Anybody running Tor 0.2.8.12 or earlier should upgrade to this
  12964. this release, if for some reason they cannot upgrade to a later
  12965. release series, and if they build Tor with the --enable-expensive-hardening
  12966. option.
  12967. Note that support for Tor 0.2.8.x is ending next year: we will not issue
  12968. any fixes for the Tor 0.2.8.x series after 1 Jan 2018. If you need
  12969. a Tor release series with longer-term support, we recommend Tor 0.2.9.x.
  12970. o Major bugfixes (parsing, backported from 0.3.0.4-rc):
  12971. - Fix an integer underflow bug when comparing malformed Tor
  12972. versions. This bug could crash Tor when built with
  12973. --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
  12974. 0.2.9.8, which were built with -ftrapv by default. In other cases
  12975. it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
  12976. on 0.0.8pre1. Found by OSS-Fuzz.
  12977. o Minor features (geoip):
  12978. - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
  12979. Country database.
  12980. Changes in version 0.2.7.7 - 2017-03-03
  12981. Tor 0.2.7.7 backports a number of security fixes from later Tor
  12982. releases. Anybody running Tor 0.2.7.6 or earlier should upgrade to
  12983. this release, if for some reason they cannot upgrade to a later
  12984. release series.
  12985. Note that support for Tor 0.2.7.x is ending this year: we will not issue
  12986. any fixes for the Tor 0.2.7.x series after 1 August 2017. If you need
  12987. a Tor release series with longer-term support, we recommend Tor 0.2.9.x.
  12988. o Directory authority changes (backport from 0.2.8.5-rc):
  12989. - Urras is no longer a directory authority. Closes ticket 19271.
  12990. o Directory authority changes (backport from 0.2.9.2-alpha):
  12991. - The "Tonga" bridge authority has been retired; the new bridge
  12992. authority is "Bifroest". Closes tickets 19728 and 19690.
  12993. o Directory authority key updates (backport from 0.2.8.1-alpha):
  12994. - Update the V3 identity key for the dannenberg directory authority:
  12995. it was changed on 18 November 2015. Closes task 17906. Patch
  12996. by "teor".
  12997. o Major bugfixes (parsing, security, backport from 0.2.9.8):
  12998. - Fix a bug in parsing that could cause clients to read a single
  12999. byte past the end of an allocated region. This bug could be used
  13000. to cause hardened clients (built with --enable-expensive-hardening)
  13001. to crash if they tried to visit a hostile hidden service. Non-
  13002. hardened clients are only affected depending on the details of
  13003. their platform's memory allocator. Fixes bug 21018; bugfix on
  13004. 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
  13005. 2016-12-002 and as CVE-2016-1254.
  13006. o Major bugfixes (security, client, DNS proxy, backport from 0.2.8.3-alpha):
  13007. - Stop a crash that could occur when a client running with DNSPort
  13008. received a query with multiple address types, and the first
  13009. address type was not supported. Found and fixed by Scott Dial.
  13010. Fixes bug 18710; bugfix on 0.2.5.4-alpha.
  13011. - Prevent a class of security bugs caused by treating the contents
  13012. of a buffer chunk as if they were a NUL-terminated string. At
  13013. least one such bug seems to be present in all currently used
  13014. versions of Tor, and would allow an attacker to remotely crash
  13015. most Tor instances, especially those compiled with extra compiler
  13016. hardening. With this defense in place, such bugs can't crash Tor,
  13017. though we should still fix them as they occur. Closes ticket
  13018. 20384 (TROVE-2016-10-001).
  13019. o Major bugfixes (security, pointers, backport from 0.2.8.2-alpha):
  13020. - Avoid a difficult-to-trigger heap corruption attack when extending
  13021. a smartlist to contain over 16GB of pointers. Fixes bug 18162;
  13022. bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
  13023. Reported by Guido Vranken.
  13024. o Major bugfixes (dns proxy mode, crash, backport from 0.2.8.2-alpha):
  13025. - Avoid crashing when running as a DNS proxy. Fixes bug 16248;
  13026. bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
  13027. o Major bugfixes (key management, backport from 0.2.8.3-alpha):
  13028. - If OpenSSL fails to generate an RSA key, do not retain a dangling
  13029. pointer to the previous (uninitialized) key value. The impact here
  13030. should be limited to a difficult-to-trigger crash, if OpenSSL is
  13031. running an engine that makes key generation failures possible, or
  13032. if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
  13033. 0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
  13034. Baishakhi Ray.
  13035. o Major bugfixes (parsing, backported from 0.3.0.4-rc):
  13036. - Fix an integer underflow bug when comparing malformed Tor
  13037. versions. This bug could crash Tor when built with
  13038. --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
  13039. 0.2.9.8, which were built with -ftrapv by default. In other cases
  13040. it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
  13041. on 0.0.8pre1. Found by OSS-Fuzz.
  13042. o Minor features (security, memory erasure, backport from 0.2.8.1-alpha):
  13043. - Make memwipe() do nothing when passed a NULL pointer or buffer of
  13044. zero size. Check size argument to memwipe() for underflow. Fixes
  13045. bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
  13046. patch by "teor".
  13047. o Minor features (bug-resistance, backport from 0.2.8.2-alpha):
  13048. - Make Tor survive errors involving connections without a
  13049. corresponding event object. Previously we'd fail with an
  13050. assertion; now we produce a log message. Related to bug 16248.
  13051. o Minor features (geoip):
  13052. - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
  13053. Country database.
  13054. Changes in version 0.2.6.11 - 2017-03-03
  13055. Tor 0.2.6.11 backports a number of security fixes from later Tor
  13056. releases. Anybody running Tor 0.2.6.10 or earlier should upgrade to
  13057. this release, if for some reason they cannot upgrade to a later
  13058. release series.
  13059. Note that support for Tor 0.2.6.x is ending this year: we will not issue
  13060. any fixes for the Tor 0.2.6.x series after 1 August 2017. If you need
  13061. a Tor release series with longer-term support, we recommend Tor 0.2.9.x.
  13062. o Directory authority changes (backport from 0.2.8.5-rc):
  13063. - Urras is no longer a directory authority. Closes ticket 19271.
  13064. o Directory authority changes (backport from 0.2.9.2-alpha):
  13065. - The "Tonga" bridge authority has been retired; the new bridge
  13066. authority is "Bifroest". Closes tickets 19728 and 19690.
  13067. o Directory authority key updates (backport from 0.2.8.1-alpha):
  13068. - Update the V3 identity key for the dannenberg directory authority:
  13069. it was changed on 18 November 2015. Closes task 17906. Patch
  13070. by "teor".
  13071. o Major features (security fixes, backport from 0.2.9.4-alpha):
  13072. - Prevent a class of security bugs caused by treating the contents
  13073. of a buffer chunk as if they were a NUL-terminated string. At
  13074. least one such bug seems to be present in all currently used
  13075. versions of Tor, and would allow an attacker to remotely crash
  13076. most Tor instances, especially those compiled with extra compiler
  13077. hardening. With this defense in place, such bugs can't crash Tor,
  13078. though we should still fix them as they occur. Closes ticket
  13079. 20384 (TROVE-2016-10-001).
  13080. o Major bugfixes (parsing, security, backport from 0.2.9.8):
  13081. - Fix a bug in parsing that could cause clients to read a single
  13082. byte past the end of an allocated region. This bug could be used
  13083. to cause hardened clients (built with --enable-expensive-hardening)
  13084. to crash if they tried to visit a hostile hidden service. Non-
  13085. hardened clients are only affected depending on the details of
  13086. their platform's memory allocator. Fixes bug 21018; bugfix on
  13087. 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
  13088. 2016-12-002 and as CVE-2016-1254.
  13089. o Major bugfixes (security, client, DNS proxy, backport from 0.2.8.3-alpha):
  13090. - Stop a crash that could occur when a client running with DNSPort
  13091. received a query with multiple address types, and the first
  13092. address type was not supported. Found and fixed by Scott Dial.
  13093. Fixes bug 18710; bugfix on 0.2.5.4-alpha.
  13094. o Major bugfixes (security, correctness, backport from 0.2.7.4-rc):
  13095. - Fix an error that could cause us to read 4 bytes before the
  13096. beginning of an openssl string. This bug could be used to cause
  13097. Tor to crash on systems with unusual malloc implementations, or
  13098. systems with unusual hardening installed. Fixes bug 17404; bugfix
  13099. on 0.2.3.6-alpha.
  13100. o Major bugfixes (security, pointers, backport from 0.2.8.2-alpha):
  13101. - Avoid a difficult-to-trigger heap corruption attack when extending
  13102. a smartlist to contain over 16GB of pointers. Fixes bug 18162;
  13103. bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
  13104. Reported by Guido Vranken.
  13105. o Major bugfixes (dns proxy mode, crash, backport from 0.2.8.2-alpha):
  13106. - Avoid crashing when running as a DNS proxy. Fixes bug 16248;
  13107. bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
  13108. o Major bugfixes (guard selection, backport from 0.2.7.6):
  13109. - Actually look at the Guard flag when selecting a new directory
  13110. guard. When we implemented the directory guard design, we
  13111. accidentally started treating all relays as if they have the Guard
  13112. flag during guard selection, leading to weaker anonymity and worse
  13113. performance. Fixes bug 17772; bugfix on 0.2.4.8-alpha. Discovered
  13114. by Mohsen Imani.
  13115. o Major bugfixes (key management, backport from 0.2.8.3-alpha):
  13116. - If OpenSSL fails to generate an RSA key, do not retain a dangling
  13117. pointer to the previous (uninitialized) key value. The impact here
  13118. should be limited to a difficult-to-trigger crash, if OpenSSL is
  13119. running an engine that makes key generation failures possible, or
  13120. if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
  13121. 0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
  13122. Baishakhi Ray.
  13123. o Major bugfixes (parsing, backported from 0.3.0.4-rc):
  13124. - Fix an integer underflow bug when comparing malformed Tor
  13125. versions. This bug could crash Tor when built with
  13126. --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
  13127. 0.2.9.8, which were built with -ftrapv by default. In other cases
  13128. it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
  13129. on 0.0.8pre1. Found by OSS-Fuzz.
  13130. o Minor features (security, memory erasure, backport from 0.2.8.1-alpha):
  13131. - Make memwipe() do nothing when passed a NULL pointer or buffer of
  13132. zero size. Check size argument to memwipe() for underflow. Fixes
  13133. bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
  13134. patch by "teor".
  13135. o Minor features (bug-resistance, backport from 0.2.8.2-alpha):
  13136. - Make Tor survive errors involving connections without a
  13137. corresponding event object. Previously we'd fail with an
  13138. assertion; now we produce a log message. Related to bug 16248.
  13139. o Minor features (geoip):
  13140. - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
  13141. Country database.
  13142. o Minor bugfixes (compilation, backport from 0.2.7.6):
  13143. - Fix a compilation warning with Clang 3.6: Do not check the
  13144. presence of an address which can never be NULL. Fixes bug 17781.
  13145. Changes in version 0.2.5.13 - 2017-03-03
  13146. Tor 0.2.5.13 backports a number of security fixes from later Tor
  13147. releases. Anybody running Tor 0.2.5.13 or earlier should upgrade to
  13148. this release, if for some reason they cannot upgrade to a later
  13149. release series.
  13150. Note that support for Tor 0.2.5.x is ending next year: we will not issue
  13151. any fixes for the Tor 0.2.5.x series after 1 May 2018. If you need
  13152. a Tor release series with longer-term support, we recommend Tor 0.2.9.x.
  13153. o Directory authority changes (backport from 0.2.8.5-rc):
  13154. - Urras is no longer a directory authority. Closes ticket 19271.
  13155. o Directory authority changes (backport from 0.2.9.2-alpha):
  13156. - The "Tonga" bridge authority has been retired; the new bridge
  13157. authority is "Bifroest". Closes tickets 19728 and 19690.
  13158. o Directory authority key updates (backport from 0.2.8.1-alpha):
  13159. - Update the V3 identity key for the dannenberg directory authority:
  13160. it was changed on 18 November 2015. Closes task 17906. Patch
  13161. by "teor".
  13162. o Major features (security fixes, backport from 0.2.9.4-alpha):
  13163. - Prevent a class of security bugs caused by treating the contents
  13164. of a buffer chunk as if they were a NUL-terminated string. At
  13165. least one such bug seems to be present in all currently used
  13166. versions of Tor, and would allow an attacker to remotely crash
  13167. most Tor instances, especially those compiled with extra compiler
  13168. hardening. With this defense in place, such bugs can't crash Tor,
  13169. though we should still fix them as they occur. Closes ticket
  13170. 20384 (TROVE-2016-10-001).
  13171. o Major bugfixes (parsing, security, backport from 0.2.9.8):
  13172. - Fix a bug in parsing that could cause clients to read a single
  13173. byte past the end of an allocated region. This bug could be used
  13174. to cause hardened clients (built with --enable-expensive-hardening)
  13175. to crash if they tried to visit a hostile hidden service. Non-
  13176. hardened clients are only affected depending on the details of
  13177. their platform's memory allocator. Fixes bug 21018; bugfix on
  13178. 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
  13179. 2016-12-002 and as CVE-2016-1254.
  13180. o Major bugfixes (security, client, DNS proxy, backport from 0.2.8.3-alpha):
  13181. - Stop a crash that could occur when a client running with DNSPort
  13182. received a query with multiple address types, and the first
  13183. address type was not supported. Found and fixed by Scott Dial.
  13184. Fixes bug 18710; bugfix on 0.2.5.4-alpha.
  13185. o Major bugfixes (security, correctness, backport from 0.2.7.4-rc):
  13186. - Fix an error that could cause us to read 4 bytes before the
  13187. beginning of an openssl string. This bug could be used to cause
  13188. Tor to crash on systems with unusual malloc implementations, or
  13189. systems with unusual hardening installed. Fixes bug 17404; bugfix
  13190. on 0.2.3.6-alpha.
  13191. o Major bugfixes (security, pointers, backport from 0.2.8.2-alpha):
  13192. - Avoid a difficult-to-trigger heap corruption attack when extending
  13193. a smartlist to contain over 16GB of pointers. Fixes bug 18162;
  13194. bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
  13195. Reported by Guido Vranken.
  13196. o Major bugfixes (dns proxy mode, crash, backport from 0.2.8.2-alpha):
  13197. - Avoid crashing when running as a DNS proxy. Fixes bug 16248;
  13198. bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
  13199. o Major bugfixes (guard selection, backport from 0.2.7.6):
  13200. - Actually look at the Guard flag when selecting a new directory
  13201. guard. When we implemented the directory guard design, we
  13202. accidentally started treating all relays as if they have the Guard
  13203. flag during guard selection, leading to weaker anonymity and worse
  13204. performance. Fixes bug 17772; bugfix on 0.2.4.8-alpha. Discovered
  13205. by Mohsen Imani.
  13206. o Major bugfixes (key management, backport from 0.2.8.3-alpha):
  13207. - If OpenSSL fails to generate an RSA key, do not retain a dangling
  13208. pointer to the previous (uninitialized) key value. The impact here
  13209. should be limited to a difficult-to-trigger crash, if OpenSSL is
  13210. running an engine that makes key generation failures possible, or
  13211. if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
  13212. 0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
  13213. Baishakhi Ray.
  13214. o Major bugfixes (parsing, backported from 0.3.0.4-rc):
  13215. - Fix an integer underflow bug when comparing malformed Tor
  13216. versions. This bug could crash Tor when built with
  13217. --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
  13218. 0.2.9.8, which were built with -ftrapv by default. In other cases
  13219. it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
  13220. on 0.0.8pre1. Found by OSS-Fuzz.
  13221. o Minor features (security, memory erasure, backport from 0.2.8.1-alpha):
  13222. - Make memwipe() do nothing when passed a NULL pointer or buffer of
  13223. zero size. Check size argument to memwipe() for underflow. Fixes
  13224. bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
  13225. patch by "teor".
  13226. o Minor features (bug-resistance, backport from 0.2.8.2-alpha):
  13227. - Make Tor survive errors involving connections without a
  13228. corresponding event object. Previously we'd fail with an
  13229. assertion; now we produce a log message. Related to bug 16248.
  13230. o Minor features (geoip):
  13231. - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
  13232. Country database.
  13233. o Minor bugfixes (compilation, backport from 0.2.7.6):
  13234. - Fix a compilation warning with Clang 3.6: Do not check the
  13235. presence of an address which can never be NULL. Fixes bug 17781.
  13236. o Minor bugfixes (crypto error-handling, backport from 0.2.7.2-alpha):
  13237. - Check for failures from crypto_early_init, and refuse to continue.
  13238. A previous typo meant that we could keep going with an
  13239. uninitialized crypto library, and would have OpenSSL initialize
  13240. its own PRNG. Fixes bug 16360; bugfix on 0.2.5.2-alpha, introduced
  13241. when implementing ticket 4900. Patch by "teor".
  13242. o Minor bugfixes (hidden service, backport from 0.2.7.1-alpha):
  13243. - Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
  13244. a client authorized hidden service. Fixes bug 15823; bugfix
  13245. on 0.2.1.6-alpha.
  13246. Changes in version 0.2.4.28 - 2017-03-03
  13247. Tor 0.2.4.28 backports a number of security fixes from later Tor
  13248. releases. Anybody running Tor 0.2.4.27 or earlier should upgrade to
  13249. this release, if for some reason they cannot upgrade to a later
  13250. release series.
  13251. Note that support for Tor 0.2.4.x is ending soon: we will not issue
  13252. any fixes for the Tor 0.2.4.x series after 1 August 2017. If you need
  13253. a Tor release series with long-term support, we recommend Tor 0.2.9.x.
  13254. o Directory authority changes (backport from 0.2.8.5-rc):
  13255. - Urras is no longer a directory authority. Closes ticket 19271.
  13256. o Directory authority changes (backport from 0.2.9.2-alpha):
  13257. - The "Tonga" bridge authority has been retired; the new bridge
  13258. authority is "Bifroest". Closes tickets 19728 and 19690.
  13259. o Directory authority key updates (backport from 0.2.8.1-alpha):
  13260. - Update the V3 identity key for the dannenberg directory authority:
  13261. it was changed on 18 November 2015. Closes task 17906. Patch
  13262. by "teor".
  13263. o Major features (security fixes, backport from 0.2.9.4-alpha):
  13264. - Prevent a class of security bugs caused by treating the contents
  13265. of a buffer chunk as if they were a NUL-terminated string. At
  13266. least one such bug seems to be present in all currently used
  13267. versions of Tor, and would allow an attacker to remotely crash
  13268. most Tor instances, especially those compiled with extra compiler
  13269. hardening. With this defense in place, such bugs can't crash Tor,
  13270. though we should still fix them as they occur. Closes ticket
  13271. 20384 (TROVE-2016-10-001).
  13272. o Major bugfixes (parsing, security, backport from 0.2.9.8):
  13273. - Fix a bug in parsing that could cause clients to read a single
  13274. byte past the end of an allocated region. This bug could be used
  13275. to cause hardened clients (built with --enable-expensive-hardening)
  13276. to crash if they tried to visit a hostile hidden service. Non-
  13277. hardened clients are only affected depending on the details of
  13278. their platform's memory allocator. Fixes bug 21018; bugfix on
  13279. 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
  13280. 2016-12-002 and as CVE-2016-1254.
  13281. o Major bugfixes (security, correctness, backport from 0.2.7.4-rc):
  13282. - Fix an error that could cause us to read 4 bytes before the
  13283. beginning of an openssl string. This bug could be used to cause
  13284. Tor to crash on systems with unusual malloc implementations, or
  13285. systems with unusual hardening installed. Fixes bug 17404; bugfix
  13286. on 0.2.3.6-alpha.
  13287. o Major bugfixes (security, pointers, backport from 0.2.8.2-alpha):
  13288. - Avoid a difficult-to-trigger heap corruption attack when extending
  13289. a smartlist to contain over 16GB of pointers. Fixes bug 18162;
  13290. bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
  13291. Reported by Guido Vranken.
  13292. o Major bugfixes (dns proxy mode, crash, backport from 0.2.8.2-alpha):
  13293. - Avoid crashing when running as a DNS proxy. Fixes bug 16248;
  13294. bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
  13295. o Major bugfixes (guard selection, backport from 0.2.7.6):
  13296. - Actually look at the Guard flag when selecting a new directory
  13297. guard. When we implemented the directory guard design, we
  13298. accidentally started treating all relays as if they have the Guard
  13299. flag during guard selection, leading to weaker anonymity and worse
  13300. performance. Fixes bug 17772; bugfix on 0.2.4.8-alpha. Discovered
  13301. by Mohsen Imani.
  13302. o Major bugfixes (key management, backport from 0.2.8.3-alpha):
  13303. - If OpenSSL fails to generate an RSA key, do not retain a dangling
  13304. pointer to the previous (uninitialized) key value. The impact here
  13305. should be limited to a difficult-to-trigger crash, if OpenSSL is
  13306. running an engine that makes key generation failures possible, or
  13307. if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
  13308. 0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
  13309. Baishakhi Ray.
  13310. o Major bugfixes (parsing, backported from 0.3.0.4-rc):
  13311. - Fix an integer underflow bug when comparing malformed Tor
  13312. versions. This bug could crash Tor when built with
  13313. --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
  13314. 0.2.9.8, which were built with -ftrapv by default. In other cases
  13315. it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
  13316. on 0.0.8pre1. Found by OSS-Fuzz.
  13317. o Minor features (security, memory erasure, backport from 0.2.8.1-alpha):
  13318. - Make memwipe() do nothing when passed a NULL pointer or buffer of
  13319. zero size. Check size argument to memwipe() for underflow. Fixes
  13320. bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
  13321. patch by "teor".
  13322. o Minor features (bug-resistance, backport from 0.2.8.2-alpha):
  13323. - Make Tor survive errors involving connections without a
  13324. corresponding event object. Previously we'd fail with an
  13325. assertion; now we produce a log message. Related to bug 16248.
  13326. o Minor features (DoS-resistance, backport from 0.2.7.1-alpha):
  13327. - Make it harder for attackers to overload hidden services with
  13328. introductions, by blocking multiple introduction requests on the
  13329. same circuit. Resolves ticket 15515.
  13330. o Minor features (geoip):
  13331. - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
  13332. Country database.
  13333. o Minor bugfixes (compilation, backport from 0.2.7.6):
  13334. - Fix a compilation warning with Clang 3.6: Do not check the
  13335. presence of an address which can never be NULL. Fixes bug 17781.
  13336. o Minor bugfixes (hidden service, backport from 0.2.7.1-alpha):
  13337. - Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
  13338. a client authorized hidden service. Fixes bug 15823; bugfix
  13339. on 0.2.1.6-alpha.
  13340. Changes in version 0.2.9.10 - 2017-03-01
  13341. Tor 0.2.9.10 backports a security fix from later Tor release. It also
  13342. includes fixes for some major issues affecting directory authorities,
  13343. LibreSSL compatibility, and IPv6 correctness.
  13344. The Tor 0.2.9.x release series is now marked as a long-term-support
  13345. series. We intend to backport security fixes to 0.2.9.x until at
  13346. least January of 2020.
  13347. o Major bugfixes (directory authority, 0.3.0.3-alpha):
  13348. - During voting, when marking a relay as a probable sybil, do not
  13349. clear its BadExit flag: sybils can still be bad in other ways
  13350. too. (We still clear the other flags.) Fixes bug 21108; bugfix
  13351. on 0.2.0.13-alpha.
  13352. o Major bugfixes (IPv6 Exits, backport from 0.3.0.3-alpha):
  13353. - Stop rejecting all IPv6 traffic on Exits whose exit policy rejects
  13354. any IPv6 addresses. Instead, only reject a port over IPv6 if the
  13355. exit policy rejects that port on more than an IPv6 /16 of
  13356. addresses. This bug was made worse by 17027 in 0.2.8.1-alpha,
  13357. which rejected a relay's own IPv6 address by default. Fixes bug
  13358. 21357; bugfix on commit 004f3f4e53 in 0.2.4.7-alpha.
  13359. o Major bugfixes (parsing, also in 0.3.0.4-rc):
  13360. - Fix an integer underflow bug when comparing malformed Tor
  13361. versions. This bug could crash Tor when built with
  13362. --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
  13363. 0.2.9.8, which were built with -ftrapv by default. In other cases
  13364. it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
  13365. on 0.0.8pre1. Found by OSS-Fuzz.
  13366. o Minor features (directory authorities, also in 0.3.0.4-rc):
  13367. - Directory authorities now reject descriptors that claim to be
  13368. malformed versions of Tor. Helps prevent exploitation of
  13369. bug 21278.
  13370. - Reject version numbers with components that exceed INT32_MAX.
  13371. Otherwise 32-bit and 64-bit platforms would behave inconsistently.
  13372. Fixes bug 21450; bugfix on 0.0.8pre1.
  13373. o Minor features (geoip):
  13374. - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
  13375. Country database.
  13376. o Minor features (portability, compilation, backport from 0.3.0.3-alpha):
  13377. - Autoconf now checks to determine if OpenSSL structures are opaque,
  13378. instead of explicitly checking for OpenSSL version numbers. Part
  13379. of ticket 21359.
  13380. - Support building with recent LibreSSL code that uses opaque
  13381. structures. Closes ticket 21359.
  13382. o Minor bugfixes (code correctness, also in 0.3.0.4-rc):
  13383. - Repair a couple of (unreachable or harmless) cases of the risky
  13384. comparison-by-subtraction pattern that caused bug 21278.
  13385. o Minor bugfixes (tor-resolve, backport from 0.3.0.3-alpha):
  13386. - The tor-resolve command line tool now rejects hostnames over 255
  13387. characters in length. Previously, it would silently truncate them,
  13388. which could lead to bugs. Fixes bug 21280; bugfix on 0.0.9pre5.
  13389. Patch by "junglefowl".
  13390. Changes in version 0.2.9.9 - 2017-01-23
  13391. Tor 0.2.9.9 fixes a denial-of-service bug where an attacker could
  13392. cause relays and clients to crash, even if they were not built with
  13393. the --enable-expensive-hardening option. This bug affects all 0.2.9.x
  13394. versions, and also affects 0.3.0.1-alpha: all relays running an affected
  13395. version should upgrade.
  13396. This release also resolves a client-side onion service reachability
  13397. bug, and resolves a pair of small portability issues.
  13398. o Major bugfixes (security):
  13399. - Downgrade the "-ftrapv" option from "always on" to "only on when
  13400. --enable-expensive-hardening is provided." This hardening option,
  13401. like others, can turn survivable bugs into crashes -- and having
  13402. it on by default made a (relatively harmless) integer overflow bug
  13403. into a denial-of-service bug. Fixes bug 21278 (TROVE-2017-001);
  13404. bugfix on 0.2.9.1-alpha.
  13405. o Major bugfixes (client, onion service):
  13406. - Fix a client-side onion service reachability bug, where multiple
  13407. socks requests to an onion service (or a single slow request)
  13408. could cause us to mistakenly mark some of the service's
  13409. introduction points as failed, and we cache that failure so
  13410. eventually we run out and can't reach the service. Also resolves a
  13411. mysterious "Remote server sent bogus reason code 65021" log
  13412. warning. The bug was introduced in ticket 17218, where we tried to
  13413. remember the circuit end reason as a uint16_t, which mangled
  13414. negative values. Partially fixes bug 21056 and fixes bug 20307;
  13415. bugfix on 0.2.8.1-alpha.
  13416. o Minor features (geoip):
  13417. - Update geoip and geoip6 to the January 4 2017 Maxmind GeoLite2
  13418. Country database.
  13419. o Minor bugfixes (portability):
  13420. - Avoid crashing when Tor is built using headers that contain
  13421. CLOCK_MONOTONIC_COARSE, but then tries to run on an older kernel
  13422. without CLOCK_MONOTONIC_COARSE. Fixes bug 21035; bugfix
  13423. on 0.2.9.1-alpha.
  13424. - Fix Libevent detection on platforms without Libevent 1 headers
  13425. installed. Fixes bug 21051; bugfix on 0.2.9.1-alpha.
  13426. Changes in version 0.2.8.12 - 2016-12-19
  13427. Tor 0.2.8.12 backports a fix for a medium-severity issue (bug 21018
  13428. below) where Tor clients could crash when attempting to visit a
  13429. hostile hidden service. Clients are recommended to upgrade as packages
  13430. become available for their systems.
  13431. It also includes an updated list of fallback directories, backported
  13432. from 0.2.9.
  13433. Now that the Tor 0.2.9 series is stable, only major bugfixes will be
  13434. backported to 0.2.8 in the future.
  13435. o Major bugfixes (parsing, security, backported from 0.2.9.8):
  13436. - Fix a bug in parsing that could cause clients to read a single
  13437. byte past the end of an allocated region. This bug could be used
  13438. to cause hardened clients (built with --enable-expensive-hardening)
  13439. to crash if they tried to visit a hostile hidden service. Non-
  13440. hardened clients are only affected depending on the details of
  13441. their platform's memory allocator. Fixes bug 21018; bugfix on
  13442. 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
  13443. 2016-12-002 and as CVE-2016-1254.
  13444. o Minor features (fallback directory list, backported from 0.2.9.8):
  13445. - Replace the 81 remaining fallbacks of the 100 originally
  13446. introduced in Tor 0.2.8.3-alpha in March 2016, with a list of 177
  13447. fallbacks (123 new, 54 existing, 27 removed) generated in December
  13448. 2016. Resolves ticket 20170.
  13449. o Minor features (geoip, backported from 0.2.9.7-rc):
  13450. - Update geoip and geoip6 to the December 7 2016 Maxmind GeoLite2
  13451. Country database.
  13452. Changes in version 0.2.9.8 - 2016-12-19
  13453. Tor 0.2.9.8 is the first stable release of the Tor 0.2.9 series.
  13454. The Tor 0.2.9 series makes mandatory a number of security features
  13455. that were formerly optional. It includes support for a new shared-
  13456. randomness protocol that will form the basis for next generation
  13457. hidden services, includes a single-hop hidden service mode for
  13458. optimizing .onion services that don't actually want to be hidden,
  13459. tries harder not to overload the directory authorities with excessive
  13460. downloads, and supports a better protocol versioning scheme for
  13461. improved compatibility with other implementations of the Tor protocol.
  13462. And of course, there are numerous other bugfixes and improvements.
  13463. This release also includes a fix for a medium-severity issue (bug
  13464. 21018 below) where Tor clients could crash when attempting to visit a
  13465. hostile hidden service. Clients are recommended to upgrade as packages
  13466. become available for their systems.
  13467. Below are listed the changes since Tor 0.2.8.11. For a list of
  13468. changes since 0.2.9.7-rc, see the ChangeLog file.
  13469. o New system requirements:
  13470. - When building with OpenSSL, Tor now requires version 1.0.1 or
  13471. later. OpenSSL 1.0.0 and earlier are no longer supported by the
  13472. OpenSSL team, and should not be used. Closes ticket 20303.
  13473. - Tor now requires Libevent version 2.0.10-stable or later. Older
  13474. versions of Libevent have less efficient backends for several
  13475. platforms, and lack the DNS code that we use for our server-side
  13476. DNS support. This implements ticket 19554.
  13477. - Tor now requires zlib version 1.2 or later, for security,
  13478. efficiency, and (eventually) gzip support. (Back when we started,
  13479. zlib 1.1 and zlib 1.0 were still found in the wild. 1.2 was
  13480. released in 2003. We recommend the latest version.)
  13481. o Deprecated features:
  13482. - A number of DNS-cache-related sub-options for client ports are now
  13483. deprecated for security reasons, and may be removed in a future
  13484. version of Tor. (We believe that client-side DNS caching is a bad
  13485. idea for anonymity, and you should not turn it on.) The options
  13486. are: CacheDNS, CacheIPv4DNS, CacheIPv6DNS, UseDNSCache,
  13487. UseIPv4Cache, and UseIPv6Cache.
  13488. - A number of options are deprecated for security reasons, and may
  13489. be removed in a future version of Tor. The options are:
  13490. AllowDotExit, AllowInvalidNodes, AllowSingleHopCircuits,
  13491. AllowSingleHopExits, ClientDNSRejectInternalAddresses,
  13492. CloseHSClientCircuitsImmediatelyOnTimeout,
  13493. CloseHSServiceRendCircuitsImmediatelyOnTimeout,
  13494. ExcludeSingleHopRelays, FastFirstHopPK, TLSECGroup,
  13495. UseNTorHandshake, and WarnUnsafeSocks.
  13496. - The *ListenAddress options are now deprecated as unnecessary: the
  13497. corresponding *Port options should be used instead. These options
  13498. may someday be removed. The affected options are:
  13499. ControlListenAddress, DNSListenAddress, DirListenAddress,
  13500. NATDListenAddress, ORListenAddress, SocksListenAddress,
  13501. and TransListenAddress.
  13502. o Major bugfixes (parsing, security, new since 0.2.9.7-rc):
  13503. - Fix a bug in parsing that could cause clients to read a single
  13504. byte past the end of an allocated region. This bug could be used
  13505. to cause hardened clients (built with --enable-expensive-hardening)
  13506. to crash if they tried to visit a hostile hidden service. Non-
  13507. hardened clients are only affected depending on the details of
  13508. their platform's memory allocator. Fixes bug 21018; bugfix on
  13509. 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
  13510. 2016-12-002 and as CVE-2016-1254.
  13511. o Major features (build, hardening):
  13512. - Tor now builds with -ftrapv by default on compilers that support
  13513. it. This option detects signed integer overflow (which C forbids),
  13514. and turns it into a hard-failure. We do not apply this option to
  13515. code that needs to run in constant time to avoid side-channels;
  13516. instead, we use -fwrapv in that code. Closes ticket 17983.
  13517. - When --enable-expensive-hardening is selected, stop applying the
  13518. clang/gcc sanitizers to code that needs to run in constant time.
  13519. Although we are aware of no introduced side-channels, we are not
  13520. able to prove that there are none. Related to ticket 17983.
  13521. o Major features (circuit building, security):
  13522. - Authorities, relays, and clients now require ntor keys in all
  13523. descriptors, for all hops (except for rare hidden service protocol
  13524. cases), for all circuits, and for all other roles. Part of
  13525. ticket 19163.
  13526. - Authorities, relays, and clients only use ntor, except for
  13527. rare cases in the hidden service protocol. Part of ticket 19163.
  13528. o Major features (compilation):
  13529. - Our big list of extra GCC warnings is now enabled by default when
  13530. building with GCC (or with anything like Clang that claims to be
  13531. GCC-compatible). To make all warnings into fatal compilation
  13532. errors, pass --enable-fatal-warnings to configure. Closes
  13533. ticket 19044.
  13534. - Use the Autoconf macro AC_USE_SYSTEM_EXTENSIONS to automatically
  13535. turn on C and POSIX extensions. (Previously, we attempted to do
  13536. this on an ad hoc basis.) Closes ticket 19139.
  13537. o Major features (directory authorities, hidden services):
  13538. - Directory authorities can now perform the shared randomness
  13539. protocol specified by proposal 250. Using this protocol, directory
  13540. authorities generate a global fresh random value every day. In the
  13541. future, this value will be used by hidden services to select
  13542. HSDirs. This release implements the directory authority feature;
  13543. the hidden service side will be implemented in the future as part
  13544. of proposal 224. Resolves ticket 16943; implements proposal 250.
  13545. o Major features (downloading, random exponential backoff):
  13546. - When we fail to download an object from a directory service, wait
  13547. for an (exponentially increasing) randomized amount of time before
  13548. retrying, rather than a fixed interval as we did before. This
  13549. prevents a group of Tor instances from becoming too synchronized,
  13550. or a single Tor instance from becoming too predictable, in its
  13551. download schedule. Closes ticket 15942.
  13552. o Major features (resource management):
  13553. - Tor can now notice it is about to run out of sockets, and
  13554. preemptively close connections of lower priority. (This feature is
  13555. off by default for now, since the current prioritizing method is
  13556. yet not mature enough. You can enable it by setting
  13557. "DisableOOSCheck 0", but watch out: it might close some sockets
  13558. you would rather have it keep.) Closes ticket 18640.
  13559. o Major features (single-hop "hidden" services):
  13560. - Add experimental HiddenServiceSingleHopMode and
  13561. HiddenServiceNonAnonymousMode options. When both are set to 1,
  13562. every hidden service on that Tor instance becomes a non-anonymous
  13563. Single Onion Service. Single Onions make one-hop (direct)
  13564. connections to their introduction and rendezvous points. One-hop
  13565. circuits make Single Onion servers easily locatable, but clients
  13566. remain location-anonymous. This is compatible with the existing
  13567. hidden service implementation, and works on the current Tor
  13568. network without any changes to older relays or clients. Implements
  13569. proposal 260, completes ticket 17178. Patch by teor and asn.
  13570. o Major features (subprotocol versions):
  13571. - Tor directory authorities now vote on a set of recommended
  13572. "subprotocol versions", and on a set of required subprotocol
  13573. versions. Clients and relays that lack support for a _required_
  13574. subprotocol version will not start; those that lack support for a
  13575. _recommended_ subprotocol version will warn the user to upgrade.
  13576. This change allows compatible implementations of the Tor protocol(s)
  13577. to exist without pretending to be 100% bug-compatible with
  13578. particular releases of Tor itself. Closes ticket 19958; implements
  13579. part of proposal 264.
  13580. o Major bugfixes (circuit building):
  13581. - Hidden service client-to-intro-point and service-to-rendezvous-
  13582. point circuits use the TAP key supplied by the protocol, to avoid
  13583. epistemic attacks. Fixes bug 19163; bugfix on 0.2.4.18-rc.
  13584. o Major bugfixes (download scheduling):
  13585. - Avoid resetting download status for consensuses hourly, since we
  13586. already have another, smarter retry mechanism. Fixes bug 8625;
  13587. bugfix on 0.2.0.9-alpha.
  13588. - If a consensus expires while we are waiting for certificates to
  13589. download, stop waiting for certificates.
  13590. - If we stop waiting for certificates less than a minute after we
  13591. started downloading them, do not consider the certificate download
  13592. failure a separate failure. Fixes bug 20533; bugfix
  13593. on 0.2.0.9-alpha.
  13594. - When using exponential backoff in test networks, use a lower
  13595. exponent, so the delays do not vary as much. This helps test
  13596. networks bootstrap consistently. Fixes bug 20597; bugfix on 20499.
  13597. o Major bugfixes (exit policies):
  13598. - Avoid disclosing exit outbound bind addresses, configured port
  13599. bind addresses, and local interface addresses in relay descriptors
  13600. by default under ExitPolicyRejectPrivate. Instead, only reject
  13601. these (otherwise unlisted) addresses if
  13602. ExitPolicyRejectLocalInterfaces is set. Fixes bug 18456; bugfix on
  13603. 0.2.7.2-alpha. Patch by teor.
  13604. o Major bugfixes (hidden services):
  13605. - Allow Tor clients with appropriate controllers to work with
  13606. FetchHidServDescriptors set to 0. Previously, this option also
  13607. disabled descriptor cache lookup, thus breaking hidden services
  13608. entirely. Fixes bug 18704; bugfix on 0.2.0.20-rc. Patch by "twim".
  13609. - Clients now require hidden services to include the TAP keys for
  13610. their intro points in the hidden service descriptor. This prevents
  13611. an inadvertent upgrade to ntor, which a malicious hidden service
  13612. could use to distinguish clients by consensus version. Fixes bug
  13613. 20012; bugfix on 0.2.4.8-alpha. Patch by teor.
  13614. o Major bugfixes (relay, resolver, logging):
  13615. - For relays that don't know their own address, avoid attempting a
  13616. local hostname resolve for each descriptor we download. This
  13617. will cut down on the number of "Success: chose address 'x.x.x.x'"
  13618. log lines, and also avoid confusing clock jumps if the resolver
  13619. is slow. Fixes bugs 20423 and 20610; bugfix on 0.2.8.1-alpha.
  13620. o Minor features (port flags):
  13621. - Add new flags to the *Port options to give finer control over which
  13622. requests are allowed. The flags are NoDNSRequest, NoOnionTraffic,
  13623. and the synthetic flag OnionTrafficOnly, which is equivalent to
  13624. NoDNSRequest, NoIPv4Traffic, and NoIPv6Traffic. Closes enhancement
  13625. 18693; patch by "teor".
  13626. o Minor features (build, hardening):
  13627. - Detect and work around a libclang_rt problem that would prevent
  13628. clang from finding __mulodi4() on some 32-bit platforms, and thus
  13629. keep -ftrapv from linking on those systems. Closes ticket 19079.
  13630. - When building on a system without runtime support for the runtime
  13631. hardening options, try to log a useful warning at configuration
  13632. time, rather than an incomprehensible warning at link time. If
  13633. expensive hardening was requested, this warning becomes an error.
  13634. Closes ticket 18895.
  13635. o Minor features (client, directory):
  13636. - Since authorities now omit all routers that lack the Running and
  13637. Valid flags, we assume that any relay listed in the consensus must
  13638. have those flags. Closes ticket 20001; implements part of
  13639. proposal 272.
  13640. o Minor features (code safety):
  13641. - In our integer-parsing functions, ensure that the maximum value we
  13642. allow is no smaller than the minimum value. Closes ticket 19063;
  13643. patch from "U+039b".
  13644. o Minor features (compilation, portability):
  13645. - Compile correctly on MacOS 10.12 (aka "Sierra"). Closes
  13646. ticket 20241.
  13647. o Minor features (config):
  13648. - Warn users when descriptor and port addresses are inconsistent.
  13649. Mitigates bug 13953; patch by teor.
  13650. o Minor features (controller):
  13651. - Allow controllers to configure basic client authorization on
  13652. hidden services when they create them with the ADD_ONION controller
  13653. command. Implements ticket 15588. Patch by "special".
  13654. - Fire a STATUS_SERVER controller event whenever the hibernation
  13655. status changes between "awake"/"soft"/"hard". Closes ticket 18685.
  13656. - Implement new GETINFO queries for all downloads that use
  13657. download_status_t to schedule retries. This allows controllers to
  13658. examine the schedule for pending downloads. Closes ticket 19323.
  13659. o Minor features (development tools, etags):
  13660. - Teach the "make tags" Makefile target how to correctly find
  13661. "MOCK_IMPL" function definitions. Patch from nherring; closes
  13662. ticket 16869.
  13663. o Minor features (directory authority):
  13664. - After voting, if the authorities decide that a relay is not
  13665. "Valid", they no longer include it in the consensus at all. Closes
  13666. ticket 20002; implements part of proposal 272.
  13667. - Directory authorities now only give the Guard flag to a relay if
  13668. they are also giving it the Stable flag. This change allows us to
  13669. simplify path selection for clients. It should have minimal effect
  13670. in practice, since >99% of Guards already have the Stable flag.
  13671. Implements ticket 18624.
  13672. - Directory authorities now write their v3-status-votes file out to
  13673. disk earlier in the consensus process, so we have a record of the
  13674. votes even if we abort the consensus process. Resolves
  13675. ticket 19036.
  13676. o Minor features (fallback directory list, new since 0.2.9.7-rc):
  13677. - Replace the 81 remaining fallbacks of the 100 originally
  13678. introduced in Tor 0.2.8.3-alpha in March 2016, with a list of 177
  13679. fallbacks (123 new, 54 existing, 27 removed) generated in December
  13680. 2016. Resolves ticket 20170.
  13681. o Minor features (hidden service):
  13682. - Stop being so strict about the payload length of "rendezvous1"
  13683. cells. We used to be locked in to the "TAP" handshake length, and
  13684. now we can handle better handshakes like "ntor". Resolves
  13685. ticket 18998.
  13686. o Minor features (infrastructure, time):
  13687. - Tor now includes an improved timer backend, so that we can
  13688. efficiently support tens or hundreds of thousands of concurrent
  13689. timers, as will be needed for some of our planned anti-traffic-
  13690. analysis work. This code is based on William Ahern's "timeout.c"
  13691. project, which implements a "tickless hierarchical timing wheel".
  13692. Closes ticket 18365.
  13693. - Tor now uses the operating system's monotonic timers (where
  13694. available) for internal fine-grained timing. Previously we would
  13695. look at the system clock, and then attempt to compensate for the
  13696. clock running backwards. Closes ticket 18908.
  13697. o Minor features (logging):
  13698. - Add a set of macros to check nonfatal assertions, for internal
  13699. use. Migrating more of our checks to these should help us avoid
  13700. needless crash bugs. Closes ticket 18613.
  13701. - Provide a more useful warning message when configured with an
  13702. invalid Nickname. Closes ticket 18300; patch from "icanhasaccount".
  13703. - When dumping unparseable router descriptors, optionally store them
  13704. in separate files, named by digest, up to a configurable size
  13705. limit. You can change the size limit by setting the
  13706. MaxUnparseableDescSizeToLog option, and disable this feature by
  13707. setting that option to 0. Closes ticket 18322.
  13708. o Minor features (performance):
  13709. - Change the "optimistic data" extension from "off by default" to
  13710. "on by default". The default was ordinarily overridden by a
  13711. consensus option, but when clients were bootstrapping for the
  13712. first time, they would not have a consensus to get the option
  13713. from. Changing this default saves a round-trip during startup.
  13714. Closes ticket 18815.
  13715. o Minor features (relay, usability):
  13716. - When the directory authorities refuse a bad relay's descriptor,
  13717. encourage the relay operator to contact us. Many relay operators
  13718. won't notice this line in their logs, but it's a win if even a few
  13719. learn why we don't like what their relay was doing. Resolves
  13720. ticket 18760.
  13721. o Minor features (security, TLS):
  13722. - Servers no longer support clients that lack AES ciphersuites.
  13723. (3DES is no longer considered an acceptable cipher.) We believe
  13724. that no such Tor clients currently exist, since Tor has required
  13725. OpenSSL 0.9.7 or later since 2009. Closes ticket 19998.
  13726. o Minor features (testing):
  13727. - Disable memory protections on OpenBSD when performing our unit
  13728. tests for memwipe(). The test deliberately invokes undefined
  13729. behavior, and the OpenBSD protections interfere with this. Patch
  13730. from "rubiate". Closes ticket 20066.
  13731. - Move the test-network.sh script to chutney, and modify tor's test-
  13732. network.sh to call the (newer) chutney version when available.
  13733. Resolves ticket 19116. Patch by teor.
  13734. - Use the lcov convention for marking lines as unreachable, so that
  13735. we don't count them when we're generating test coverage data.
  13736. Update our coverage tools to understand this convention. Closes
  13737. ticket 16792.
  13738. - Our link-handshake unit tests now check that when invalid
  13739. handshakes fail, they fail with the error messages we expected.
  13740. - Our unit testing code that captures log messages no longer
  13741. prevents them from being written out if the user asked for them
  13742. (by passing --debug or --info or --notice or --warn to the "test"
  13743. binary). This change prevents us from missing unexpected log
  13744. messages simply because we were looking for others. Related to
  13745. ticket 19999.
  13746. - The unit tests now log all warning messages with the "BUG" flag.
  13747. Previously, they only logged errors by default. This change will
  13748. help us make our testing code more correct, and make sure that we
  13749. only hit this code when we mean to. In the meantime, however,
  13750. there will be more warnings in the unit test logs than before.
  13751. This is preparatory work for ticket 19999.
  13752. - The unit tests now treat any failure of a "tor_assert_nonfatal()"
  13753. assertion as a test failure.
  13754. - We've done significant work to make the unit tests run faster.
  13755. o Minor features (testing, ipv6):
  13756. - Add the hs-ipv6 chutney target to make test-network-all's IPv6
  13757. tests. Remove bridges+hs, as it's somewhat redundant. This
  13758. requires a recent chutney version that supports IPv6 clients,
  13759. relays, and authorities. Closes ticket 20069; patch by teor.
  13760. - Add the single-onion and single-onion-ipv6 chutney targets to
  13761. "make test-network-all". This requires a recent chutney version
  13762. with the single onion network flavors (git c72a652 or later).
  13763. Closes ticket 20072; patch by teor.
  13764. o Minor features (Tor2web):
  13765. - Make Tor2web clients respect ReachableAddresses. This feature was
  13766. inadvertently enabled in 0.2.8.6, then removed by bugfix 19973 on
  13767. 0.2.8.7. Implements feature 20034. Patch by teor.
  13768. o Minor features (unix domain sockets):
  13769. - When configuring a unix domain socket for a SocksPort,
  13770. ControlPort, or Hidden service, you can now wrap the address in
  13771. quotes, using C-style escapes inside the quotes. This allows unix
  13772. domain socket paths to contain spaces. Resolves ticket 18753.
  13773. o Minor features (user interface):
  13774. - Tor now supports the ability to declare options deprecated, so
  13775. that we can recommend that people stop using them. Previously, this
  13776. was done in an ad-hoc way. There is a new --list-deprecated-options
  13777. command-line option to list all of the deprecated options. Closes
  13778. ticket 19820.
  13779. o Minor features (virtual addresses):
  13780. - Increase the maximum number of bits for the IPv6 virtual network
  13781. prefix from 16 to 104. In this way, the condition for address
  13782. allocation is less restrictive. Closes ticket 20151; feature
  13783. on 0.2.4.7-alpha.
  13784. o Minor bug fixes (circuits):
  13785. - Use the CircuitBuildTimeout option whenever
  13786. LearnCircuitBuildTimeout is disabled. Previously, we would respect
  13787. the option when a user disabled it, but not when it was disabled
  13788. because some other option was set. Fixes bug 20073; bugfix on
  13789. 0.2.4.12-alpha. Patch by teor.
  13790. o Minor bugfixes (build):
  13791. - The current Git revision when building from a local repository is
  13792. now detected correctly when using git worktrees. Fixes bug 20492;
  13793. bugfix on 0.2.3.9-alpha.
  13794. o Minor bugfixes (relay address discovery):
  13795. - Stop reordering IP addresses returned by the OS. This makes it
  13796. more likely that Tor will guess the same relay IP address every
  13797. time. Fixes issue 20163; bugfix on 0.2.7.1-alpha, ticket 17027.
  13798. Reported by René Mayrhofer, patch by "cypherpunks".
  13799. o Minor bugfixes (memory allocation):
  13800. - Change how we allocate memory for large chunks on buffers, to
  13801. avoid a (currently impossible) integer overflow, and to waste less
  13802. space when allocating unusually large chunks. Fixes bug 20081;
  13803. bugfix on 0.2.0.16-alpha. Issue identified by Guido Vranken.
  13804. o Minor bugfixes (bootstrap):
  13805. - Remember the directory server we fetched the consensus or previous
  13806. certificates from, and use it to fetch future authority
  13807. certificates. This change improves bootstrapping performance.
  13808. Fixes bug 18963; bugfix on 0.2.8.1-alpha.
  13809. o Minor bugfixes (circuits):
  13810. - Make sure extend_info_from_router() is only called on servers.
  13811. Fixes bug 19639; bugfix on 0.2.8.1-alpha.
  13812. o Minor bugfixes (client, fascistfirewall):
  13813. - Avoid spurious warnings when ReachableAddresses or FascistFirewall
  13814. is set. Fixes bug 20306; bugfix on 0.2.8.2-alpha.
  13815. o Minor bugfixes (client, unix domain sockets):
  13816. - Disable IsolateClientAddr when using AF_UNIX backed SocksPorts as
  13817. the client address is meaningless. Fixes bug 20261; bugfix
  13818. on 0.2.6.3-alpha.
  13819. o Minor bugfixes (code style):
  13820. - Fix an integer signedness conversion issue in the case conversion
  13821. tables. Fixes bug 19168; bugfix on 0.2.1.11-alpha.
  13822. o Minor bugfixes (compilation):
  13823. - Build correctly on versions of libevent2 without support for
  13824. evutil_secure_rng_add_bytes(). Fixes bug 19904; bugfix
  13825. on 0.2.5.4-alpha.
  13826. - When building with Clang, use a full set of GCC warnings.
  13827. (Previously, we included only a subset, because of the way we
  13828. detected them.) Fixes bug 19216; bugfix on 0.2.0.1-alpha.
  13829. - Detect Libevent2 functions correctly on systems that provide
  13830. libevent2, but where libevent1 is linked with -levent. Fixes bug
  13831. 19904; bugfix on 0.2.2.24-alpha. Patch from Rubiate.
  13832. - Run correctly when built on Windows build environments that
  13833. require _vcsprintf(). Fixes bug 20560; bugfix on 0.2.2.11-alpha.
  13834. o Minor bugfixes (configuration):
  13835. - When parsing quoted configuration values from the torrc file,
  13836. handle Windows line endings correctly. Fixes bug 19167; bugfix on
  13837. 0.2.0.16-alpha. Patch from "Pingl".
  13838. o Minor bugfixes (directory authority):
  13839. - Authorities now sort the "package" lines in their votes, for ease
  13840. of debugging. (They are already sorted in consensus documents.)
  13841. Fixes bug 18840; bugfix on 0.2.6.3-alpha.
  13842. - Die with a more useful error when the operator forgets to place
  13843. the authority_signing_key file into the keys directory. This
  13844. avoids an uninformative assert & traceback about having an invalid
  13845. key. Fixes bug 20065; bugfix on 0.2.0.1-alpha.
  13846. - When allowing private addresses, mark Exits that only exit to
  13847. private locations as such. Fixes bug 20064; bugfix
  13848. on 0.2.2.9-alpha.
  13849. - When parsing a detached signature, make sure we use the length of
  13850. the digest algorithm instead of a hardcoded DIGEST256_LEN in
  13851. order to avoid comparing bytes out-of-bounds with a smaller digest
  13852. length such as SHA1. Fixes bug 19066; bugfix on 0.2.2.6-alpha.
  13853. o Minor bugfixes (getpass):
  13854. - Defensively fix a non-triggerable heap corruption at do_getpass()
  13855. to protect ourselves from mistakes in the future. Fixes bug
  13856. 19223; bugfix on 0.2.7.3-rc. Bug found by Guido Vranken, patch
  13857. by nherring.
  13858. o Minor bugfixes (guard selection):
  13859. - Don't mark guards as unreachable if connection_connect() fails.
  13860. That function fails for local reasons, so it shouldn't reveal
  13861. anything about the status of the guard. Fixes bug 14334; bugfix
  13862. on 0.2.3.10-alpha.
  13863. - Use a single entry guard even if the NumEntryGuards consensus
  13864. parameter is not provided. Fixes bug 17688; bugfix
  13865. on 0.2.5.6-alpha.
  13866. o Minor bugfixes (hidden services):
  13867. - Increase the minimum number of internal circuits we preemptively
  13868. build from 2 to 3, so a circuit is available when a client
  13869. connects to another onion service. Fixes bug 13239; bugfix
  13870. on 0.1.0.1-rc.
  13871. - Allow hidden services to run on IPv6 addresses even when the
  13872. IPv6Exit option is not set. Fixes bug 18357; bugfix
  13873. on 0.2.4.7-alpha.
  13874. - Stop logging intro point details to the client log on certain
  13875. error conditions. Fixed as part of bug 20012; bugfix on
  13876. 0.2.4.8-alpha. Patch by teor.
  13877. - When deleting an ephemeral hidden service, close its intro points
  13878. even if they are not completely open. Fixes bug 18604; bugfix
  13879. on 0.2.7.1-alpha.
  13880. - When configuring hidden services, check every hidden service
  13881. directory's permissions. Previously, we only checked the last
  13882. hidden service. Fixes bug 20529; bugfix on 0.2.6.2-alpha.
  13883. o Minor bugfixes (IPv6, testing):
  13884. - Check for IPv6 correctly on Linux when running test networks.
  13885. Fixes bug 19905; bugfix on 0.2.7.3-rc; patch by teor.
  13886. o Minor bugfixes (Linux seccomp2 sandbox):
  13887. - Add permission to run the sched_yield() and sigaltstack() system
  13888. calls, in order to support versions of Tor compiled with asan or
  13889. ubsan code that use these calls. Now "sandbox 1" and
  13890. "--enable-expensive-hardening" should be compatible on more
  13891. systems. Fixes bug 20063; bugfix on 0.2.5.1-alpha.
  13892. o Minor bugfixes (logging):
  13893. - Downgrade a harmless log message about the
  13894. pending_entry_connections list from "warn" to "info". Mitigates
  13895. bug 19926.
  13896. - Log a more accurate message when we fail to dump a microdescriptor.
  13897. Fixes bug 17758; bugfix on 0.2.2.8-alpha. Patch from Daniel Pinto.
  13898. - When logging a directory ownership mismatch, log the owning
  13899. username correctly. Fixes bug 19578; bugfix on 0.2.2.29-beta.
  13900. - When we are unable to remove the bw_accounting file, do not warn
  13901. if the reason we couldn't remove it was that it didn't exist.
  13902. Fixes bug 19964; bugfix on 0.2.5.4-alpha. Patch from pastly.
  13903. o Minor bugfixes (memory leak):
  13904. - Fix a series of slow memory leaks related to parsing torrc files
  13905. and options. Fixes bug 19466; bugfix on 0.2.1.6-alpha.
  13906. - Avoid a small memory leak when informing worker threads about
  13907. rotated onion keys. Fixes bug 20401; bugfix on 0.2.6.3-alpha.
  13908. - Fix a small memory leak when receiving AF_UNIX connections on a
  13909. SocksPort. Fixes bug 20716; bugfix on 0.2.6.3-alpha.
  13910. - When moving a signed descriptor object from a source to an
  13911. existing destination, free the allocated memory inside that
  13912. destination object. Fixes bug 20715; bugfix on 0.2.8.3-alpha.
  13913. - Fix a memory leak and use-after-free error when removing entries
  13914. from the sandbox's getaddrinfo() cache. Fixes bug 20710; bugfix on
  13915. 0.2.5.5-alpha. Patch from "cypherpunks".
  13916. - Fix a small, uncommon memory leak that could occur when reading a
  13917. truncated ed25519 key file. Fixes bug 18956; bugfix
  13918. on 0.2.6.1-alpha.
  13919. o Minor bugfixes (option parsing):
  13920. - Count unix sockets when counting client listeners (SOCKS, Trans,
  13921. NATD, and DNS). This has no user-visible behavior changes: these
  13922. options are set once, and never read. Required for correct
  13923. behavior in ticket 17178. Fixes bug 19677; bugfix on
  13924. 0.2.6.3-alpha. Patch by teor.
  13925. o Minor bugfixes (options):
  13926. - Check the consistency of UseEntryGuards and EntryNodes more
  13927. reliably. Fixes bug 20074; bugfix on 0.2.4.12-alpha. Patch
  13928. by teor.
  13929. - Stop changing the configured value of UseEntryGuards on
  13930. authorities and Tor2web clients. Fixes bug 20074; bugfix on
  13931. commits 51fc6799 in 0.1.1.16-rc and acda1735 in 0.2.4.3-alpha.
  13932. Patch by teor.
  13933. o Minor bugfixes (relay):
  13934. - Ensure relays don't make multiple connections during bootstrap.
  13935. Fixes bug 20591; bugfix on 0.2.8.1-alpha.
  13936. - Do not try to parallelize workers more than 16x without the user
  13937. explicitly configuring us to do so, even if we do detect more than
  13938. 16 CPU cores. Fixes bug 19968; bugfix on 0.2.3.1-alpha.
  13939. o Minor bugfixes (testing):
  13940. - The test-stem and test-network makefile targets now depend only on
  13941. the tor binary that they are testing. Previously, they depended on
  13942. "make all". Fixes bug 18240; bugfix on 0.2.8.2-alpha. Based on a
  13943. patch from "cypherpunks".
  13944. - Allow clients to retry HSDirs much faster in test networks. Fixes
  13945. bug 19702; bugfix on 0.2.7.1-alpha. Patch by teor.
  13946. - Avoid a unit test failure on systems with over 16 detectable CPU
  13947. cores. Fixes bug 19968; bugfix on 0.2.3.1-alpha.
  13948. - Let backtrace tests work correctly under AddressSanitizer:
  13949. disable ASAN's detection of segmentation faults while running
  13950. test_bt.sh, so that we can make sure that our own backtrace
  13951. generation code works. Fixes bug 18934; bugfix
  13952. on 0.2.5.2-alpha. Patch from "cypherpunks".
  13953. - Fix the test-network-all target on out-of-tree builds by using the
  13954. correct path to the test driver script. Fixes bug 19421; bugfix
  13955. on 0.2.7.3-rc.
  13956. - Stop spurious failures in the local interface address discovery
  13957. unit tests. Fixes bug 20634; bugfix on 0.2.8.1-alpha; patch by
  13958. Neel Chauhan.
  13959. - Use ECDHE ciphers instead of ECDH in tortls tests. LibreSSL has
  13960. removed the ECDH ciphers which caused the tests to fail on
  13961. platforms which use it. Fixes bug 20460; bugfix on 0.2.8.1-alpha.
  13962. - The tor_tls_server_info_callback unit test no longer crashes when
  13963. debug-level logging is turned on. Fixes bug 20041; bugfix
  13964. on 0.2.8.1-alpha.
  13965. o Minor bugfixes (time):
  13966. - Improve overflow checks in tv_udiff and tv_mdiff. Fixes bug 19483;
  13967. bugfix on all released tor versions.
  13968. - When computing the difference between two times in milliseconds,
  13969. we now round to the nearest millisecond correctly. Previously, we
  13970. could sometimes round in the wrong direction. Fixes bug 19428;
  13971. bugfix on 0.2.2.2-alpha.
  13972. o Minor bugfixes (Tor2web):
  13973. - Prevent Tor2web clients from running hidden services: these services
  13974. are not anonymous due to the one-hop client paths. Fixes bug
  13975. 19678. Patch by teor.
  13976. o Minor bugfixes (user interface):
  13977. - Display a more accurate number of suppressed messages in the log
  13978. rate-limiter. Previously, there was a potential integer overflow
  13979. in the counter. Now, if the number of messages hits a maximum, the
  13980. rate-limiter doesn't count any further. Fixes bug 19435; bugfix
  13981. on 0.2.4.11-alpha.
  13982. - Fix a typo in the passphrase prompt for the ed25519 identity key.
  13983. Fixes bug 19503; bugfix on 0.2.7.2-alpha.
  13984. o Code simplification and refactoring:
  13985. - Remove redundant declarations of the MIN macro. Closes
  13986. ticket 18889.
  13987. - Rename tor_dup_addr() to tor_addr_to_str_dup() to avoid confusion.
  13988. Closes ticket 18462; patch from "icanhasaccount".
  13989. - Split the 600-line directory_handle_command_get function into
  13990. separate functions for different URL types. Closes ticket 16698.
  13991. o Documentation:
  13992. - Add module-level internal documentation for 36 C files that
  13993. previously didn't have a high-level overview. Closes ticket 20385.
  13994. - Correct the IPv6 syntax in our documentation for the
  13995. VirtualAddrNetworkIPv6 torrc option. Closes ticket 19743.
  13996. - Correct the minimum bandwidth value in torrc.sample, and queue a
  13997. corresponding change for torrc.minimal. Closes ticket 20085.
  13998. - Fix spelling of "--enable-tor2web-mode" in the manpage. Closes
  13999. ticket 19153. Patch from "U+039b".
  14000. - Module-level documentation for several more modules. Closes
  14001. tickets 19287 and 19290.
  14002. - Document the --passphrase-fd option in the tor manpage. Fixes bug
  14003. 19504; bugfix on 0.2.7.3-rc.
  14004. - Document the default PathsNeededToBuildCircuits value that's used
  14005. by clients when the directory authorities don't set
  14006. min_paths_for_circs_pct. Fixes bug 20117; bugfix on 0.2.4.10-alpha.
  14007. Patch by teor, reported by Jesse V.
  14008. - Fix manual for the User option: it takes a username, not a UID.
  14009. Fixes bug 19122; bugfix on 0.0.2pre16 (the first version to have
  14010. a manpage!).
  14011. - Fix the description of the --passphrase-fd option in the
  14012. tor-gencert manpage. The option is used to pass the number of a
  14013. file descriptor to read the passphrase from, not to read the file
  14014. descriptor from. Fixes bug 19505; bugfix on 0.2.0.20-alpha.
  14015. o Removed code:
  14016. - We no longer include the (dead, deprecated) bufferevent code in
  14017. Tor. Closes ticket 19450. Based on a patch from "U+039b".
  14018. o Removed features:
  14019. - Remove support for "GET /tor/bytes.txt" DirPort request, and
  14020. "GETINFO dir-usage" controller request, which were only available
  14021. via a compile-time option in Tor anyway. Feature was added in
  14022. 0.2.2.1-alpha. Resolves ticket 19035.
  14023. - There is no longer a compile-time option to disable support for
  14024. TransPort. (If you don't want TransPort, just don't use it.) Patch
  14025. from "U+039b". Closes ticket 19449.
  14026. o Testing:
  14027. - Run more workqueue tests as part of "make check". These had
  14028. previously been implemented, but you needed to know special
  14029. command-line options to enable them.
  14030. - We now have unit tests for our code to reject zlib "compression
  14031. bombs". (Fortunately, the code works fine.)
  14032. Changes in version 0.2.8.11 - 2016-12-08
  14033. Tor 0.2.8.11 backports fixes for additional portability issues that
  14034. could prevent Tor from building correctly on OSX Sierra, or with
  14035. OpenSSL 1.1. Affected users should upgrade; others can safely stay
  14036. with 0.2.8.10.
  14037. o Minor bugfixes (portability):
  14038. - Avoid compilation errors when building on OSX Sierra. Sierra began
  14039. to support the getentropy() and clock_gettime() APIs, but created
  14040. a few problems in doing so. Tor 0.2.9 has a more thorough set of
  14041. workarounds; in 0.2.8, we are just using the /dev/urandom and mach
  14042. monotonic time interfaces. Fixes bug 20865. Bugfix
  14043. on 0.2.8.1-alpha.
  14044. o Minor bugfixes (portability, backport from 0.2.9.5-alpha):
  14045. - Fix compilation with OpenSSL 1.1 and less commonly-used CPU
  14046. architectures. Closes ticket 20588.
  14047. Changes in version 0.2.8.10 - 2016-12-02
  14048. Tor 0.2.8.10 backports a fix for a bug that would sometimes make clients
  14049. unusable after they left standby mode. It also backports fixes for
  14050. a few portability issues and a small but problematic memory leak.
  14051. o Major bugfixes (client reliability, backport from 0.2.9.5-alpha):
  14052. - When Tor leaves standby because of a new application request, open
  14053. circuits as needed to serve that request. Previously, we would
  14054. potentially wait a very long time. Fixes part of bug 19969; bugfix
  14055. on 0.2.8.1-alpha.
  14056. o Major bugfixes (client performance, backport from 0.2.9.5-alpha):
  14057. - Clients now respond to new application stream requests immediately
  14058. when they arrive, rather than waiting up to one second before
  14059. starting to handle them. Fixes part of bug 19969; bugfix
  14060. on 0.2.8.1-alpha.
  14061. o Minor bugfixes (portability, backport from 0.2.9.6-rc):
  14062. - Work around a bug in the OSX 10.12 SDK that would prevent us from
  14063. successfully targeting earlier versions of OSX. Resolves
  14064. ticket 20235.
  14065. o Minor bugfixes (portability, backport from 0.2.9.5-alpha):
  14066. - Fix implicit conversion warnings under OpenSSL 1.1. Fixes bug
  14067. 20551; bugfix on 0.2.1.1-alpha.
  14068. o Minor bugfixes (relay, backport from 0.2.9.5-alpha):
  14069. - Work around a memory leak in OpenSSL 1.1 when encoding public
  14070. keys. Fixes bug 20553; bugfix on 0.0.2pre8.
  14071. o Minor features (geoip):
  14072. - Update geoip and geoip6 to the November 3 2016 Maxmind GeoLite2
  14073. Country database.
  14074. Changes in version 0.2.8.9 - 2016-10-17
  14075. Tor 0.2.8.9 backports a fix for a security hole in previous versions
  14076. of Tor that would allow a remote attacker to crash a Tor client,
  14077. hidden service, relay, or authority. All Tor users should upgrade to
  14078. this version, or to 0.2.9.4-alpha. Patches will be released for older
  14079. versions of Tor.
  14080. o Major features (security fixes, also in 0.2.9.4-alpha):
  14081. - Prevent a class of security bugs caused by treating the contents
  14082. of a buffer chunk as if they were a NUL-terminated string. At
  14083. least one such bug seems to be present in all currently used
  14084. versions of Tor, and would allow an attacker to remotely crash
  14085. most Tor instances, especially those compiled with extra compiler
  14086. hardening. With this defense in place, such bugs can't crash Tor,
  14087. though we should still fix them as they occur. Closes ticket
  14088. 20384 (TROVE-2016-10-001).
  14089. o Minor features (geoip):
  14090. - Update geoip and geoip6 to the October 4 2016 Maxmind GeoLite2
  14091. Country database.
  14092. Changes in version 0.2.8.8 - 2016-09-23
  14093. Tor 0.2.8.8 fixes two crash bugs present in previous versions of the
  14094. 0.2.8.x series. Relays running 0.2.8.x should upgrade, as should users
  14095. who select public relays as their bridges.
  14096. o Major bugfixes (crash):
  14097. - Fix a complicated crash bug that could affect Tor clients
  14098. configured to use bridges when replacing a networkstatus consensus
  14099. in which one of their bridges was mentioned. OpenBSD users saw
  14100. more crashes here, but all platforms were potentially affected.
  14101. Fixes bug 20103; bugfix on 0.2.8.2-alpha.
  14102. o Major bugfixes (relay, OOM handler):
  14103. - Fix a timing-dependent assertion failure that could occur when we
  14104. tried to flush from a circuit after having freed its cells because
  14105. of an out-of-memory condition. Fixes bug 20203; bugfix on
  14106. 0.2.8.1-alpha. Thanks to "cypherpunks" for help diagnosing
  14107. this one.
  14108. o Minor feature (fallback directories):
  14109. - Remove broken fallbacks from the hard-coded fallback directory
  14110. list. Closes ticket 20190; patch by teor.
  14111. o Minor features (geoip):
  14112. - Update geoip and geoip6 to the September 6 2016 Maxmind GeoLite2
  14113. Country database.
  14114. Changes in version 0.2.8.7 - 2016-08-24
  14115. Tor 0.2.8.7 fixes an important bug related to the ReachableAddresses
  14116. option in 0.2.8.6, and replaces a retiring bridge authority. Everyone
  14117. who sets the ReachableAddresses option, and all bridges, are strongly
  14118. encouraged to upgrade.
  14119. o Directory authority changes:
  14120. - The "Tonga" bridge authority has been retired; the new bridge
  14121. authority is "Bifroest". Closes tickets 19728 and 19690.
  14122. o Major bugfixes (client, security):
  14123. - Only use the ReachableAddresses option to restrict the first hop
  14124. in a path. In earlier versions of 0.2.8.x, it would apply to
  14125. every hop in the path, with a possible degradation in anonymity
  14126. for anyone using an uncommon ReachableAddress setting. Fixes bug
  14127. 19973; bugfix on 0.2.8.2-alpha.
  14128. o Minor features (geoip):
  14129. - Update geoip and geoip6 to the August 2 2016 Maxmind GeoLite2
  14130. Country database.
  14131. o Minor bugfixes (compilation):
  14132. - Remove an inappropriate "inline" in tortls.c that was causing
  14133. warnings on older versions of GCC. Fixes bug 19903; bugfix
  14134. on 0.2.8.1-alpha.
  14135. o Minor bugfixes (fallback directories):
  14136. - Avoid logging a NULL string pointer when loading fallback
  14137. directory information. Fixes bug 19947; bugfix on 0.2.4.7-alpha
  14138. and 0.2.8.1-alpha. Report and patch by "rubiate".
  14139. Changes in version 0.2.8.6 - 2016-08-02
  14140. Tor 0.2.8.6 is the first stable version of the Tor 0.2.8 series.
  14141. The Tor 0.2.8 series improves client bootstrapping performance,
  14142. completes the authority-side implementation of improved identity
  14143. keys for relays, and includes numerous bugfixes and performance
  14144. improvements throughout the program. This release continues to
  14145. improve the coverage of Tor's test suite. For a full list of
  14146. changes since Tor 0.2.7, see the ReleaseNotes file.
  14147. Below is a list of the changes since Tor 0.2.7.
  14148. o New system requirements:
  14149. - Tor no longer attempts to support platforms where the "time_t"
  14150. type is unsigned. (To the best of our knowledge, only OpenVMS does
  14151. this, and Tor has never actually built on OpenVMS.) Closes
  14152. ticket 18184.
  14153. - Tor no longer supports versions of OpenSSL with a broken
  14154. implementation of counter mode. (This bug was present in OpenSSL
  14155. 1.0.0, and was fixed in OpenSSL 1.0.0a.) Tor still detects, but no
  14156. longer runs with, these versions.
  14157. - Tor now uses Autoconf version 2.63 or later, and Automake 1.11 or
  14158. later (released in 2008 and 2009 respectively). If you are
  14159. building Tor from the git repository instead of from the source
  14160. distribution, and your tools are older than this, you will need to
  14161. upgrade. Closes ticket 17732.
  14162. o Directory authority changes:
  14163. - Update the V3 identity key for the dannenberg directory authority:
  14164. it was changed on 18 November 2015. Closes task 17906. Patch
  14165. by teor.
  14166. - Urras is no longer a directory authority. Closes ticket 19271.
  14167. o Major features (directory system):
  14168. - Include a trial list of default fallback directories, based on an
  14169. opt-in survey of suitable relays. Doing this should make clients
  14170. bootstrap more quickly and reliably, and reduce the load on the
  14171. directory authorities. Closes ticket 15775. Patch by teor.
  14172. Candidates identified using an OnionOO script by weasel, teor,
  14173. gsathya, and karsten.
  14174. - Previously only relays that explicitly opened a directory port
  14175. (DirPort) accepted directory requests from clients. Now all
  14176. relays, with and without a DirPort, accept and serve tunneled
  14177. directory requests that they receive through their ORPort. You can
  14178. disable this behavior using the new DirCache option. Closes
  14179. ticket 12538.
  14180. - When bootstrapping multiple consensus downloads at a time, use the
  14181. first one that starts downloading, and close the rest. This
  14182. reduces failures when authorities or fallback directories are slow
  14183. or down. Together with the code for feature 15775, this feature
  14184. should reduces failures due to fallback churn. Implements ticket
  14185. 4483. Patch by teor. Implements IPv4 portions of proposal 210 by
  14186. mikeperry and teor.
  14187. o Major features (security, Linux):
  14188. - When Tor starts as root on Linux and is told to switch user ID, it
  14189. can now retain the capability to bind to low ports. By default,
  14190. Tor will do this only when it's switching user ID and some low
  14191. ports have been configured. You can change this behavior with the
  14192. new option KeepBindCapabilities. Closes ticket 8195.
  14193. o Major bugfixes (client, bootstrapping):
  14194. - Check if bootstrap consensus downloads are still needed when the
  14195. linked connection attaches. This prevents tor making unnecessary
  14196. begindir-style connections, which are the only directory
  14197. connections tor clients make since the fix for 18483 was merged.
  14198. - Fix some edge cases where consensus download connections may not
  14199. have been closed, even though they were not needed. Related to fix
  14200. for 18809.
  14201. - Make relays retry consensus downloads the correct number of times,
  14202. rather than the more aggressive client retry count. Fixes part of
  14203. ticket 18809.
  14204. o Major bugfixes (dns proxy mode, crash):
  14205. - Avoid crashing when running as a DNS proxy. Fixes bug 16248;
  14206. bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
  14207. o Major bugfixes (ed25519, voting):
  14208. - Actually enable support for authorities to match routers by their
  14209. Ed25519 identities. Previously, the code had been written, but
  14210. some debugging code that had accidentally been left in the
  14211. codebase made it stay turned off. Fixes bug 17702; bugfix
  14212. on 0.2.7.2-alpha.
  14213. - When collating votes by Ed25519 identities, authorities now
  14214. include a "NoEdConsensus" flag if the ed25519 value (or lack
  14215. thereof) for a server does not reflect the majority consensus.
  14216. Related to bug 17668; bugfix on 0.2.7.2-alpha.
  14217. - When generating a vote with keypinning disabled, never include two
  14218. entries for the same ed25519 identity. This bug was causing
  14219. authorities to generate votes that they could not parse when a
  14220. router violated key pinning by changing its RSA identity but
  14221. keeping its Ed25519 identity. Fixes bug 17668; fixes part of bug
  14222. 18318. Bugfix on 0.2.7.2-alpha.
  14223. o Major bugfixes (key management):
  14224. - If OpenSSL fails to generate an RSA key, do not retain a dangling
  14225. pointer to the previous (uninitialized) key value. The impact here
  14226. should be limited to a difficult-to-trigger crash, if OpenSSL is
  14227. running an engine that makes key generation failures possible, or
  14228. if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
  14229. 0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
  14230. Baishakhi Ray.
  14231. o Major bugfixes (security, client, DNS proxy):
  14232. - Stop a crash that could occur when a client running with DNSPort
  14233. received a query with multiple address types, and the first
  14234. address type was not supported. Found and fixed by Scott Dial.
  14235. Fixes bug 18710; bugfix on 0.2.5.4-alpha.
  14236. o Major bugfixes (security, compilation):
  14237. - Correctly detect compiler flags on systems where _FORTIFY_SOURCE
  14238. is predefined. Previously, our use of -D_FORTIFY_SOURCE would
  14239. cause a compiler warning, thereby making other checks fail, and
  14240. needlessly disabling compiler-hardening support. Fixes one case of
  14241. bug 18841; bugfix on 0.2.3.17-beta. Patch from "trudokal".
  14242. - Repair hardened builds under the clang compiler. Previously, our
  14243. use of _FORTIFY_SOURCE would conflict with clang's address
  14244. sanitizer. Fixes bug 14821; bugfix on 0.2.5.4-alpha.
  14245. o Major bugfixes (security, pointers):
  14246. - Avoid a difficult-to-trigger heap corruption attack when extending
  14247. a smartlist to contain over 16GB of pointers. Fixes bug 18162;
  14248. bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
  14249. Reported by Guido Vranken.
  14250. o Major bugfixes (testing):
  14251. - Fix a bug that would block 'make test-network-all' on systems where
  14252. IPv6 packets were lost. Fixes bug 19008; bugfix on 0.2.7.3-rc.
  14253. o Major bugfixes (user interface):
  14254. - Correctly give a warning in the cases where a relay is specified
  14255. by nickname, and one such relay is found, but it is not officially
  14256. Named. Fixes bug 19203; bugfix on 0.2.3.1-alpha.
  14257. o Minor features (accounting):
  14258. - Added two modes to the AccountingRule option: One for limiting
  14259. only the number of bytes sent ("AccountingRule out"), and one for
  14260. limiting only the number of bytes received ("AccountingRule in").
  14261. Closes ticket 15989; patch from "unixninja92".
  14262. o Minor features (bug-resistance):
  14263. - Make Tor survive errors involving connections without a
  14264. corresponding event object. Previously we'd fail with an
  14265. assertion; now we produce a log message. Related to bug 16248.
  14266. - Use tor_snprintf() and tor_vsnprintf() even in external and low-
  14267. level code, to harden against accidental failures to NUL-
  14268. terminate. Part of ticket 17852. Patch from jsturgix. Found
  14269. with Flawfinder.
  14270. o Minor features (build):
  14271. - Detect systems with FreeBSD-derived kernels (such as GNU/kFreeBSD)
  14272. as having possible IPFW support. Closes ticket 18448. Patch from
  14273. Steven Chamberlain.
  14274. - Since our build process now uses "make distcheck", we no longer
  14275. force "make dist" to depend on "make check". Closes ticket 17893;
  14276. patch from "cypherpunks".
  14277. - Tor now builds once again with the recent OpenSSL 1.1 development
  14278. branch (tested against 1.1.0-pre5 and 1.1.0-pre6-dev). We have been
  14279. tracking OpenSSL 1.1 development as it has progressed, and fixing
  14280. numerous compatibility issues as they arose. See tickets
  14281. 17549, 17921, 17984, 19499, and 18286.
  14282. - When building manual pages, set the timezone to "UTC", so that the
  14283. output is reproducible. Fixes bug 19558; bugfix on 0.2.2.9-alpha.
  14284. Patch from intrigeri.
  14285. o Minor features (clients):
  14286. - Make clients, onion services, and bridge relays always use an
  14287. encrypted begindir connection for directory requests. Resolves
  14288. ticket 18483. Patch by teor.
  14289. o Minor features (controller):
  14290. - Add 'GETINFO exit-policy/reject-private/[default,relay]', so
  14291. controllers can examine the the reject rules added by
  14292. ExitPolicyRejectPrivate. This makes it easier for stem to display
  14293. exit policies.
  14294. - Adds the FallbackDir entries to 'GETINFO config/defaults'. Closes
  14295. tickets 16774 and 17817. Patch by George Tankersley.
  14296. - New 'GETINFO hs/service/desc/id/' command to retrieve a hidden
  14297. service descriptor from a service's local hidden service
  14298. descriptor cache. Closes ticket 14846.
  14299. o Minor features (crypto):
  14300. - Add SHA3 and SHAKE support to crypto.c. Closes ticket 17783.
  14301. - Add SHA512 support to crypto.c. Closes ticket 17663; patch from
  14302. George Tankersley.
  14303. - Improve performance when hashing non-multiple of 8 sized buffers,
  14304. based on Andrew Moon's public domain SipHash-2-4 implementation.
  14305. Fixes bug 17544; bugfix on 0.2.5.3-alpha.
  14306. - Validate the hard-coded Diffie-Hellman parameters and ensure that
  14307. p is a safe prime, and g is a suitable generator. Closes
  14308. ticket 18221.
  14309. - When allocating a digest state object, allocate no more space than
  14310. we actually need. Previously, we would allocate as much space as
  14311. the state for the largest algorithm would need. This change saves
  14312. up to 672 bytes per circuit. Closes ticket 17796.
  14313. o Minor features (directory downloads):
  14314. - Add UseDefaultFallbackDirs, which enables any hard-coded fallback
  14315. directory mirrors. The default is 1; set it to 0 to disable
  14316. fallbacks. Implements ticket 17576. Patch by teor.
  14317. - Wait for busy authorities and fallback directories to become non-
  14318. busy when bootstrapping. (A similar change was made in 6c443e987d
  14319. for directory caches chosen from the consensus.) Closes ticket
  14320. 17864; patch by teor.
  14321. o Minor features (geoip):
  14322. - Update geoip and geoip6 to the July 6 2016 Maxmind GeoLite2
  14323. Country database.
  14324. o Minor features (hidden service directory):
  14325. - Streamline relay-side hsdir handling: when relays consider whether
  14326. to accept an uploaded hidden service descriptor, they no longer
  14327. check whether they are one of the relays in the network that is
  14328. "supposed" to handle that descriptor. Implements ticket 18332.
  14329. o Minor features (IPv6):
  14330. - Add ClientPreferIPv6DirPort, which is set to 0 by default. If set
  14331. to 1, tor prefers IPv6 directory addresses.
  14332. - Add ClientUseIPv4, which is set to 1 by default. If set to 0, tor
  14333. avoids using IPv4 for client OR and directory connections.
  14334. - Add address policy assume_action support for IPv6 addresses.
  14335. - Add an argument 'ipv6=address:orport' to the DirAuthority and
  14336. FallbackDir torrc options, to specify an IPv6 address for an
  14337. authority or fallback directory. Add hard-coded ipv6 addresses for
  14338. directory authorities that have them. Closes ticket 17327; patch
  14339. from Nick Mathewson and teor.
  14340. - Allow users to configure directory authorities and fallback
  14341. directory servers with IPv6 addresses and ORPorts. Resolves
  14342. ticket 6027.
  14343. - Limit IPv6 mask bits to 128.
  14344. - Make tor_ersatz_socketpair work on IPv6-only systems. Fixes bug
  14345. 17638; bugfix on 0.0.2pre8. Patch by teor.
  14346. - Try harder to obey the IP version restrictions "ClientUseIPv4 0",
  14347. "ClientUseIPv6 0", "ClientPreferIPv6ORPort", and
  14348. "ClientPreferIPv6DirPort". Closes ticket 17840; patch by teor.
  14349. - Warn when comparing against an AF_UNSPEC address in a policy, it's
  14350. almost always a bug. Closes ticket 17863; patch by teor.
  14351. - routerset_parse now accepts IPv6 literal addresses. Fixes bug
  14352. 17060; bugfix on 0.2.1.3-alpha. Patch by teor.
  14353. o Minor features (Linux seccomp2 sandbox):
  14354. - Reject attempts to change our Address with "Sandbox 1" enabled.
  14355. Changing Address with Sandbox turned on would never actually work,
  14356. but previously it would fail in strange and confusing ways. Found
  14357. while fixing 18548.
  14358. o Minor features (logging):
  14359. - When logging to syslog, allow a tag to be added to the syslog
  14360. identity (the string prepended to every log message). The tag can
  14361. be configured with SyslogIdentityTag and defaults to none. Setting
  14362. it to "foo" will cause logs to be tagged as "Tor-foo". Closes
  14363. ticket 17194.
  14364. o Minor features (portability):
  14365. - Use timingsafe_memcmp() where available. Closes ticket 17944;
  14366. patch from <logan@hackers.mu>.
  14367. o Minor features (relay, address discovery):
  14368. - Add a family argument to get_interface_addresses_raw() and
  14369. subfunctions to make network interface address interogation more
  14370. efficient. Now Tor can specifically ask for IPv4, IPv6 or both
  14371. types of interfaces from the operating system. Resolves
  14372. ticket 17950.
  14373. - When get_interface_address6_list(.,AF_UNSPEC,.) is called and
  14374. fails to enumerate interface addresses using the platform-specific
  14375. API, have it rely on the UDP socket fallback technique to try and
  14376. find out what IP addresses (both IPv4 and IPv6) our machine has.
  14377. Resolves ticket 17951.
  14378. o Minor features (replay cache):
  14379. - The replay cache now uses SHA256 instead of SHA1. Implements
  14380. feature 8961. Patch by teor, issue reported by rransom.
  14381. o Minor features (robustness):
  14382. - Exit immediately with an error message if the code attempts to use
  14383. Libevent without having initialized it. This should resolve some
  14384. frequently-made mistakes in our unit tests. Closes ticket 18241.
  14385. o Minor features (security, clock):
  14386. - Warn when the system clock appears to move back in time (when the
  14387. state file was last written in the future). Tor doesn't know that
  14388. consensuses have expired if the clock is in the past. Patch by
  14389. teor. Implements ticket 17188.
  14390. o Minor features (security, exit policies):
  14391. - ExitPolicyRejectPrivate now rejects more private addresses by
  14392. default. Specifically, it now rejects the relay's outbound bind
  14393. addresses (if configured), and the relay's configured port
  14394. addresses (such as ORPort and DirPort). Fixes bug 17027; bugfix on
  14395. 0.2.0.11-alpha. Patch by teor.
  14396. o Minor features (security, memory erasure):
  14397. - Make memwipe() do nothing when passed a NULL pointer or buffer of
  14398. zero size. Check size argument to memwipe() for underflow. Fixes
  14399. bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
  14400. patch by teor.
  14401. - Set the unused entries in a smartlist to NULL. This helped catch
  14402. a (harmless) bug, and shouldn't affect performance too much.
  14403. Implements ticket 17026.
  14404. - Use SecureMemoryWipe() function to securely clean memory on
  14405. Windows. Previously we'd use OpenSSL's OPENSSL_cleanse() function.
  14406. Implements feature 17986.
  14407. - Use explicit_bzero or memset_s when present. Previously, we'd use
  14408. OpenSSL's OPENSSL_cleanse() function. Closes ticket 7419; patches
  14409. from <logan@hackers.mu> and <selven@hackers.mu>.
  14410. o Minor features (security, RNG):
  14411. - Adjust Tor's use of OpenSSL's RNG APIs so that they absolutely,
  14412. positively are not allowed to fail. Previously we depended on
  14413. internal details of OpenSSL's behavior. Closes ticket 17686.
  14414. - Never use the system entropy output directly for anything besides
  14415. seeding the PRNG. When we want to generate important keys, instead
  14416. of using system entropy directly, we now hash it with the PRNG
  14417. stream. This may help resist certain attacks based on broken OS
  14418. entropy implementations. Closes part of ticket 17694.
  14419. - Use modern system calls (like getentropy() or getrandom()) to
  14420. generate strong entropy on platforms that have them. Closes
  14421. ticket 13696.
  14422. o Minor features (security, win32):
  14423. - Set SO_EXCLUSIVEADDRUSE on Win32 to avoid a local port-stealing
  14424. attack. Fixes bug 18123; bugfix on all tor versions. Patch
  14425. by teor.
  14426. o Minor features (unix domain sockets):
  14427. - Add a new per-socket option, RelaxDirModeCheck, to allow creating
  14428. Unix domain sockets without checking the permissions on the parent
  14429. directory. (Tor checks permissions by default because some
  14430. operating systems only check permissions on the parent directory.
  14431. However, some operating systems do look at permissions on the
  14432. socket, and tor's default check is unneeded.) Closes ticket 18458.
  14433. Patch by weasel.
  14434. o Minor features (unix file permissions):
  14435. - Defer creation of Unix sockets until after setuid. This avoids
  14436. needing CAP_CHOWN and CAP_FOWNER when using systemd's
  14437. CapabilityBoundingSet, or chown and fowner when using SELinux.
  14438. Implements part of ticket 17562. Patch from Jamie Nguyen.
  14439. - If any directory created by Tor is marked as group readable, the
  14440. filesystem group is allowed to be either the default GID or the
  14441. root user. Allowing root to read the DataDirectory prevents the
  14442. need for CAP_READ_SEARCH when using systemd's
  14443. CapabilityBoundingSet, or dac_read_search when using SELinux.
  14444. Implements part of ticket 17562. Patch from Jamie Nguyen.
  14445. - Introduce a new DataDirectoryGroupReadable option. If it is set to
  14446. 1, the DataDirectory will be made readable by the default GID.
  14447. Implements part of ticket 17562. Patch from Jamie Nguyen.
  14448. o Minor bugfixes (accounting):
  14449. - The max bandwidth when using 'AccountRule sum' is now correctly
  14450. logged. Fixes bug 18024; bugfix on 0.2.6.1-alpha. Patch
  14451. from "unixninja92".
  14452. o Minor bugfixes (assert, portability):
  14453. - Fix an assertion failure in memarea.c on systems where "long" is
  14454. shorter than the size of a pointer. Fixes bug 18716; bugfix
  14455. on 0.2.1.1-alpha.
  14456. o Minor bugfixes (bootstrap):
  14457. - Consistently use the consensus download schedule for authority
  14458. certificates. Fixes bug 18816; bugfix on 0.2.4.13-alpha.
  14459. o Minor bugfixes (build):
  14460. - Avoid spurious failures from configure files related to calling
  14461. exit(0) in TOR_SEARCH_LIBRARY. Fixes bug 18626; bugfix on
  14462. 0.2.0.1-alpha. Patch from "cypherpunks".
  14463. - Do not link the unit tests against both the testing and non-
  14464. testing versions of the static libraries. Fixes bug 18490; bugfix
  14465. on 0.2.7.1-alpha.
  14466. - Resolve warnings when building on systems that are concerned with
  14467. signed char. Fixes bug 18728; bugfix on 0.2.7.2-alpha
  14468. and 0.2.6.1-alpha.
  14469. - Silence spurious clang-scan warnings in the ed25519_donna code by
  14470. explicitly initializing some objects. Fixes bug 18384; bugfix on
  14471. 0.2.7.2-alpha. Patch by teor.
  14472. - When libscrypt.h is found, but no libscrypt library can be linked,
  14473. treat libscrypt as absent. Fixes bug 19161; bugfix
  14474. on 0.2.6.1-alpha.
  14475. - Cause the unit tests to compile correctly on mingw64 versions that
  14476. lack sscanf. Fixes bug 19213; bugfix on 0.2.7.1-alpha.
  14477. - Don't try to use the pthread_condattr_setclock() function unless
  14478. it actually exists. Fixes compilation on NetBSD-6.x. Fixes bug
  14479. 17819; bugfix on 0.2.6.3-alpha.
  14480. - Fix backtrace compilation on FreeBSD. Fixes bug 17827; bugfix
  14481. on 0.2.5.2-alpha.
  14482. - Fix search for libevent libraries on OpenBSD (and other systems
  14483. that install libevent 1 and libevent 2 in parallel). Fixes bug
  14484. 16651; bugfix on 0.1.0.7-rc. Patch from "rubiate".
  14485. - Isolate environment variables meant for tests from the rest of the
  14486. build system. Fixes bug 17818; bugfix on 0.2.7.3-rc.
  14487. - Mark all object files that include micro-revision.i as depending
  14488. on it, so as to make parallel builds more reliable. Fixes bug
  14489. 17826; bugfix on 0.2.5.1-alpha.
  14490. - Remove config.log only from make distclean, not from make clean.
  14491. Fixes bug 17924; bugfix on 0.2.4.1-alpha.
  14492. - Replace usage of 'INLINE' with 'inline'. Fixes bug 17804; bugfix
  14493. on 0.0.2pre8.
  14494. - Remove an #endif from configure.ac so that we correctly detect the
  14495. presence of in6_addr.s6_addr32. Fixes bug 17923; bugfix
  14496. on 0.2.0.13-alpha.
  14497. o Minor bugfixes (client, bootstrap):
  14498. - Count receipt of new microdescriptors as progress towards
  14499. bootstrapping. Previously, with EntryNodes set, Tor might not
  14500. successfully repopulate the guard set on bootstrapping. Fixes bug
  14501. 16825; bugfix on 0.2.3.1-alpha.
  14502. o Minor bugfixes (code correctness):
  14503. - Fix a bad memory handling bug that would occur if we had queued a
  14504. cell on a channel's incoming queue. Fortunately, we can't actually
  14505. queue a cell like that as our code is constructed today, but it's
  14506. best to avoid this kind of error, even if there isn't any code
  14507. that triggers it today. Fixes bug 18570; bugfix on 0.2.4.4-alpha.
  14508. - Assert that allocated memory held by the reputation code is freed
  14509. according to its internal counters. Fixes bug 17753; bugfix
  14510. on 0.1.1.1-alpha.
  14511. - Assert when the TLS contexts fail to initialize. Fixes bug 17683;
  14512. bugfix on 0.0.6.
  14513. - Update to the latest version of Trunnel, which tries harder to
  14514. avoid generating code that can invoke memcpy(p,NULL,0). Bug found
  14515. by clang address sanitizer. Fixes bug 18373; bugfix
  14516. on 0.2.7.2-alpha.
  14517. - When closing an entry connection, generate a warning if we should
  14518. have sent an end cell for it but we haven't. Fixes bug 17876;
  14519. bugfix on 0.2.3.2-alpha.
  14520. o Minor bugfixes (configuration):
  14521. - Fix a tiny memory leak when parsing a port configuration ending in
  14522. ":auto". Fixes bug 18374; bugfix on 0.2.3.3-alpha.
  14523. o Minor bugfixes (containers):
  14524. - If we somehow attempt to construct a heap with more than
  14525. 1073741822 elements, avoid an integer overflow when maintaining
  14526. the heap property. Fixes bug 18296; bugfix on 0.1.2.1-alpha.
  14527. o Minor bugfixes (controller, microdescriptors):
  14528. - Make GETINFO dir/status-vote/current/consensus conform to the
  14529. control specification by returning "551 Could not open cached
  14530. consensus..." when not caching consensuses. Fixes bug 18920;
  14531. bugfix on 0.2.2.6-alpha.
  14532. o Minor bugfixes (crypto):
  14533. - Check the return value of HMAC() and assert on failure. Fixes bug
  14534. 17658; bugfix on 0.2.3.6-alpha. Patch by teor.
  14535. o Minor bugfixes (directories):
  14536. - When fetching extrainfo documents, compare their SHA256 digests
  14537. and Ed25519 signing key certificates with the routerinfo that led
  14538. us to fetch them, rather than with the most recent routerinfo.
  14539. Otherwise we generate many spurious warnings about mismatches.
  14540. Fixes bug 17150; bugfix on 0.2.7.2-alpha.
  14541. - When generating a URL for a directory server on an IPv6 address,
  14542. wrap the IPv6 address in square brackets. Fixes bug 18051; bugfix
  14543. on 0.2.3.9-alpha. Patch from Malek.
  14544. o Minor bugfixes (downloading):
  14545. - Predict more correctly whether we'll be downloading over HTTP when
  14546. we determine the maximum length of a URL. This should avoid a
  14547. "BUG" warning about the Squid HTTP proxy and its URL limits. Fixes
  14548. bug 19191.
  14549. o Minor bugfixes (exit policies, security):
  14550. - Refresh an exit relay's exit policy when interface addresses
  14551. change. Previously, tor only refreshed the exit policy when the
  14552. configured external address changed. Fixes bug 18208; bugfix on
  14553. 0.2.7.3-rc. Patch by teor.
  14554. o Minor bugfixes (fallback directories):
  14555. - Mark fallbacks as "too busy" when they return a 503 response,
  14556. rather than just marking authorities. Fixes bug 17572; bugfix on
  14557. 0.2.4.7-alpha. Patch by teor.
  14558. - When requesting extrainfo descriptors from a trusted directory
  14559. server, check whether it is an authority or a fallback directory
  14560. which supports extrainfo descriptors. Fixes bug 18489; bugfix on
  14561. 0.2.4.7-alpha. Reported by atagar, patch by teor.
  14562. o Minor bugfixes (hidden service, client):
  14563. - Handle the case where the user makes several fast consecutive
  14564. requests to the same .onion address. Previously, the first six
  14565. requests would each trigger a descriptor fetch, each picking a
  14566. directory (there are 6 overall) and the seventh one would fail
  14567. because no directories were left, thereby triggering a close on
  14568. all current directory connections asking for the hidden service.
  14569. The solution here is to not close the connections if we have
  14570. pending directory fetches. Fixes bug 15937; bugfix
  14571. on 0.2.7.1-alpha.
  14572. o Minor bugfixes (hidden service, control port):
  14573. - Add the onion address to the HS_DESC event for the UPLOADED action
  14574. both on success or failure. It was previously hardcoded with
  14575. UNKNOWN. Fixes bug 16023; bugfix on 0.2.7.2-alpha.
  14576. o Minor bugfixes (hidden service, directory):
  14577. - Bridges now refuse "rendezvous2" (hidden service descriptor)
  14578. publish attempts. Suggested by ticket 18332.
  14579. o Minor bugfixes (IPv6):
  14580. - Update the limits in max_dl_per_request for IPv6 address length.
  14581. Fixes bug 17573; bugfix on 0.2.1.5-alpha.
  14582. o Minor bugfixes (Linux seccomp2 sandbox):
  14583. - Allow more syscalls when running with "Sandbox 1" enabled:
  14584. sysinfo, getsockopt(SO_SNDBUF), and setsockopt(SO_SNDBUFFORCE). On
  14585. some systems, these are required for Tor to start. Fixes bug
  14586. 18397; bugfix on 0.2.5.1-alpha. Patch from Daniel Pinto.
  14587. - Allow IPPROTO_UDP datagram sockets when running with "Sandbox 1",
  14588. so that get_interface_address6_via_udp_socket_hack() can work.
  14589. Fixes bug 19660; bugfix on 0.2.5.1-alpha.
  14590. - Allow the setrlimit syscall, and the prlimit and prlimit64
  14591. syscalls, which some libc implementations use under the hood.
  14592. Fixes bug 15221; bugfix on 0.2.5.1-alpha.
  14593. - Avoid a 10-second delay when starting as a client with "Sandbox 1"
  14594. enabled and no DNS resolvers configured. This should help TAILS
  14595. start up faster. Fixes bug 18548; bugfix on 0.2.5.1-alpha.
  14596. - Fix a crash when using offline master ed25519 keys with the Linux
  14597. seccomp2 sandbox enabled. Fixes bug 17675; bugfix on 0.2.7.3-rc.
  14598. - Allow statistics to be written to disk when "Sandbox 1" is
  14599. enabled. Fixes bugs 19556 and 19957; bugfix on 0.2.5.1-alpha and
  14600. 0.2.6.1-alpha respectively.
  14601. o Minor bugfixes (logging):
  14602. - In log messages that include a function name, use __FUNCTION__
  14603. instead of __PRETTY_FUNCTION__. In GCC, these are synonymous, but
  14604. with clang __PRETTY_FUNCTION__ has extra information we don't
  14605. need. Fixes bug 16563; bugfix on 0.0.2pre8. Fix by Tom van
  14606. der Woerdt.
  14607. - Remove needless quotes from a log message about unparseable
  14608. addresses. Fixes bug 17843; bugfix on 0.2.3.3-alpha.
  14609. - Scrub service name in "unrecognized service ID" log messages.
  14610. Fixes bug 18600; bugfix on 0.2.4.11-alpha.
  14611. - When logging information about an unparsable networkstatus vote or
  14612. consensus, do not say "vote" when we mean consensus. Fixes bug
  14613. 18368; bugfix on 0.2.0.8-alpha.
  14614. - When we can't generate a signing key because OfflineMasterKey is
  14615. set, do not imply that we should have been able to load it. Fixes
  14616. bug 18133; bugfix on 0.2.7.2-alpha.
  14617. - When logging a malformed hostname received through socks4, scrub
  14618. it if SafeLogging says we should. Fixes bug 17419; bugfix
  14619. on 0.1.1.16-rc.
  14620. o Minor bugfixes (memory safety):
  14621. - Avoid freeing an uninitialized pointer when opening a socket fails
  14622. in get_interface_addresses_ioctl(). Fixes bug 18454; bugfix on
  14623. 0.2.3.11-alpha. Reported by toralf and "cypherpunks", patch
  14624. by teor.
  14625. - Fix a memory leak in "tor --list-fingerprint". Fixes part of bug
  14626. 18672; bugfix on 0.2.5.1-alpha.
  14627. - Fix a memory leak in tor-gencert. Fixes part of bug 18672; bugfix
  14628. on 0.2.0.1-alpha.
  14629. o Minor bugfixes (pluggable transports):
  14630. - Avoid reporting a spurious error when we decide that we don't need
  14631. to terminate a pluggable transport because it has already exited.
  14632. Fixes bug 18686; bugfix on 0.2.5.5-alpha.
  14633. o Minor bugfixes (pointer arithmetic):
  14634. - Fix a bug in memarea_alloc() that could have resulted in remote
  14635. heap write access, if Tor had ever passed an unchecked size to
  14636. memarea_alloc(). Fortunately, all the sizes we pass to
  14637. memarea_alloc() are pre-checked to be less than 128 kilobytes.
  14638. Fixes bug 19150; bugfix on 0.2.1.1-alpha. Bug found by
  14639. Guido Vranken.
  14640. o Minor bugfixes (private directory):
  14641. - Prevent a race condition when creating private directories. Fixes
  14642. part of bug 17852; bugfix on 0.0.2pre13. Part of ticket 17852.
  14643. Patch from jsturgix. Found with Flawfinder.
  14644. o Minor bugfixes (relays):
  14645. - Check that both the ORPort and DirPort (if present) are reachable
  14646. before publishing a relay descriptor. Otherwise, relays publish a
  14647. descriptor with DirPort 0 when the DirPort reachability test takes
  14648. longer than the ORPort reachability test. Fixes bug 18050; bugfix
  14649. on 0.1.0.1-rc. Reported by "starlight", patch by teor.
  14650. - Resolve some edge cases where we might launch an ORPort
  14651. reachability check even when DisableNetwork is set. Noticed while
  14652. fixing bug 18616; bugfix on 0.2.3.9-alpha.
  14653. o Minor bugfixes (relays, hidden services):
  14654. - Refuse connection requests to private OR addresses unless
  14655. ExtendAllowPrivateAddresses is set. Previously, tor would connect,
  14656. then refuse to send any cells to a private address. Fixes bugs
  14657. 17674 and 8976; bugfix on 0.2.3.21-rc. Patch by teor.
  14658. o Minor bugfixes (security, hidden services):
  14659. - Prevent hidden services connecting to client-supplied rendezvous
  14660. addresses that are reserved as internal or multicast. Fixes bug
  14661. 8976; bugfix on 0.2.3.21-rc. Patch by dgoulet and teor.
  14662. o Minor bugfixes (statistics):
  14663. - Consistently check for overflow in round_*_to_next_multiple_of
  14664. functions, and add unit tests with additional and maximal values.
  14665. Fixes part of bug 13192; bugfix on 0.2.2.1-alpha.
  14666. - Handle edge cases in the laplace functions: avoid division by
  14667. zero, avoid taking the log of zero, and silence clang type
  14668. conversion warnings using round and trunc. Add unit tests for edge
  14669. cases with maximal values. Fixes part of bug 13192; bugfix
  14670. on 0.2.6.2-alpha.
  14671. - We now include consensus downloads via IPv6 in our directory-
  14672. request statistics. Fixes bug 18460; bugfix on 0.2.3.14-alpha.
  14673. o Minor bugfixes (test networks, IPv6):
  14674. - Allow internal IPv6 addresses in descriptors in test networks.
  14675. Fixes bug 17153; bugfix on 0.2.3.16-alpha. Patch by teor, reported
  14676. by karsten.
  14677. o Minor bugfixes (testing):
  14678. - Check the full results of SHA256 and SHA512 digests in the unit
  14679. tests. Bugfix on 0.2.2.4-alpha. Patch by teor.
  14680. - Fix a memory leak in the ntor test. Fixes bug 17778; bugfix
  14681. on 0.2.4.8-alpha.
  14682. - Fix a small memory leak that would occur when the
  14683. TestingEnableCellStatsEvent option was turned on. Fixes bug 18673;
  14684. bugfix on 0.2.5.2-alpha.
  14685. - Make unit tests pass on IPv6-only systems, and systems without
  14686. localhost addresses (like some FreeBSD jails). Fixes bug 17632;
  14687. bugfix on 0.2.7.3-rc. Patch by teor.
  14688. - The test for log_heartbeat was incorrectly failing in timezones
  14689. with non-integer offsets. Instead of comparing the end of the time
  14690. string against a constant, compare it to the output of
  14691. format_local_iso_time when given the correct input. Fixes bug
  14692. 18039; bugfix on 0.2.5.4-alpha.
  14693. - We no longer disable assertions in the unit tests when coverage is
  14694. enabled. Instead, we require you to say --disable-asserts-in-tests
  14695. to the configure script if you need assertions disabled in the
  14696. unit tests (for example, if you want to perform branch coverage).
  14697. Fixes bug 18242; bugfix on 0.2.7.1-alpha.
  14698. o Minor bugfixes (time handling):
  14699. - When correcting a corrupt 'struct tm' value, fill in the tm_wday
  14700. field. Otherwise, our unit tests crash on Windows. Fixes bug
  14701. 18977; bugfix on 0.2.2.25-alpha.
  14702. - Avoid overflow in tor_timegm when parsing dates in and after 2038
  14703. on platforms with 32-bit time_t. Fixes bug 18479; bugfix on
  14704. 0.0.2pre14. Patch by teor.
  14705. o Minor bugfixes (tor-gencert):
  14706. - Correctly handle the case where an authority operator enters a
  14707. passphrase but sends an EOF before sending a newline. Fixes bug
  14708. 17443; bugfix on 0.2.0.20-rc. Found by junglefowl.
  14709. o Code simplification and refactoring:
  14710. - Clean up a little duplicated code in
  14711. crypto_expand_key_material_TAP(). Closes ticket 17587; patch
  14712. from "pfrankw".
  14713. - Decouple the list of streams waiting to be attached to circuits
  14714. from the overall connection list. This change makes it possible to
  14715. attach streams quickly while simplifying Tor's callgraph and
  14716. avoiding O(N) scans of the entire connection list. Closes
  14717. ticket 17590.
  14718. - Extract the more complicated parts of circuit_mark_for_close()
  14719. into a new function that we run periodically before circuits are
  14720. freed. This change removes more than half of the functions
  14721. currently in the "blob". Closes ticket 17218.
  14722. - Move logging of redundant policy entries in
  14723. policies_parse_exit_policy_internal into its own function. Closes
  14724. ticket 17608; patch from "juce".
  14725. - Quote all the string interpolations in configure.ac -- even those
  14726. which we are pretty sure can't contain spaces. Closes ticket
  14727. 17744. Patch from zerosion.
  14728. - Remove code for configuring OpenSSL dynamic locks; OpenSSL doesn't
  14729. use them. Closes ticket 17926.
  14730. - Remove specialized code for non-inplace AES_CTR. 99% of our AES is
  14731. inplace, so there's no need to have a separate implementation for
  14732. the non-inplace code. Closes ticket 18258. Patch from Malek.
  14733. - Simplify return types for some crypto functions that can't
  14734. actually fail. Patch from Hassan Alsibyani. Closes ticket 18259.
  14735. - When a direct directory request fails immediately on launch,
  14736. instead of relaunching that request from inside the code that
  14737. launches it, instead mark the connection for teardown. This change
  14738. simplifies Tor's callback and prevents the directory-request
  14739. launching code from invoking itself recursively. Closes
  14740. ticket 17589.
  14741. o Documentation:
  14742. - Add a description of the correct use of the '--keygen' command-
  14743. line option. Closes ticket 17583; based on text by 's7r'.
  14744. - Change build messages to refer to "Fedora" instead of "Fedora
  14745. Core", and "dnf" instead of "yum". Closes tickets 18459 and 18426.
  14746. Patches from "icanhasaccount" and "cypherpunks".
  14747. - Document the contents of the 'datadir/keys' subdirectory in the
  14748. manual page. Closes ticket 17621.
  14749. - Document the minimum HeartbeatPeriod value. Closes ticket 15638.
  14750. - Explain actual minima for BandwidthRate. Closes ticket 16382.
  14751. - Fix a minor formatting typo in the manpage. Closes ticket 17791.
  14752. - Mention torspec URL in the manpage and point the reader to it
  14753. whenever we mention a document that belongs in torspce. Fixes
  14754. issue 17392.
  14755. - Stop recommending use of nicknames to identify relays in our
  14756. MapAddress documentation. Closes ticket 18312.
  14757. o Removed features:
  14758. - Remove client-side support for connecting to Tor relays running
  14759. versions of Tor before 0.2.3.6-alpha. These relays didn't support
  14760. the v3 TLS handshake protocol, and are no longer allowed on the
  14761. Tor network. Implements the client side of ticket 11150. Based on
  14762. patches by Tom van der Woerdt.
  14763. - We no longer maintain an internal freelist in memarea.c.
  14764. Allocators should be good enough to make this code unnecessary,
  14765. and it's doubtful that it ever had any performance benefit.
  14766. o Testing:
  14767. - Add unit tests to check for common RNG failure modes, such as
  14768. returning all zeroes, identical values, or incrementing values
  14769. (OpenSSL's rand_predictable feature). Patch by teor.
  14770. - Always test both ed25519 backends, so that we can be sure that our
  14771. batch-open replacement code works. Part of ticket 16794.
  14772. - Cover dns_resolve_impl() in dns.c with unit tests. Implements a
  14773. portion of ticket 16831.
  14774. - Fix several warnings from clang's address sanitizer produced in
  14775. the unit tests.
  14776. - Log more information when the backtrace tests fail. Closes ticket
  14777. 17892. Patch from "cypherpunks."
  14778. - More unit tests for compat_libevent.c, procmon.c, tortls.c,
  14779. util_format.c, directory.c, and options_validate.c. Closes tickets
  14780. 17075, 17082, 17084, 17003, and 17076 respectively. Patches from
  14781. Ola Bini.
  14782. - Treat backtrace test failures as expected on FreeBSD until we
  14783. solve bug 17808. Closes ticket 18204.
  14784. - Unit tests for directory_handle_command_get. Closes ticket 17004.
  14785. Patch from Reinaldo de Souza Jr.
  14786. Changes in version 0.2.7.6 - 2015-12-10
  14787. Tor version 0.2.7.6 fixes a major bug in entry guard selection, as
  14788. well as a minor bug in hidden service reliability.
  14789. o Major bugfixes (guard selection):
  14790. - Actually look at the Guard flag when selecting a new directory
  14791. guard. When we implemented the directory guard design, we
  14792. accidentally started treating all relays as if they have the Guard
  14793. flag during guard selection, leading to weaker anonymity and worse
  14794. performance. Fixes bug 17772; bugfix on 0.2.4.8-alpha. Discovered
  14795. by Mohsen Imani.
  14796. o Minor features (geoip):
  14797. - Update geoip and geoip6 to the December 1 2015 Maxmind GeoLite2
  14798. Country database.
  14799. o Minor bugfixes (compilation):
  14800. - When checking for net/pfvar.h, include netinet/in.h if possible.
  14801. This fixes transparent proxy detection on OpenBSD. Fixes bug
  14802. 17551; bugfix on 0.1.2.1-alpha. Patch from "rubiate".
  14803. - Fix a compilation warning with Clang 3.6: Do not check the
  14804. presence of an address which can never be NULL. Fixes bug 17781.
  14805. o Minor bugfixes (correctness):
  14806. - When displaying an IPv6 exit policy, include the mask bits
  14807. correctly even when the number is greater than 31. Fixes bug
  14808. 16056; bugfix on 0.2.4.7-alpha. Patch from "gturner".
  14809. - The wrong list was used when looking up expired intro points in a
  14810. rend service object, causing what we think could be reachability
  14811. issues for hidden services, and triggering a BUG log. Fixes bug
  14812. 16702; bugfix on 0.2.7.2-alpha.
  14813. - Fix undefined behavior in the tor_cert_checksig function. Fixes
  14814. bug 17722; bugfix on 0.2.7.2-alpha.
  14815. Changes in version 0.2.7.5 - 2015-11-20
  14816. The Tor 0.2.7 release series is dedicated to the memory of Tor user
  14817. and privacy advocate Caspar Bowden (1961-2015). Caspar worked
  14818. tirelessly to advocate human rights regardless of national borders,
  14819. and oppose the encroachments of mass surveillance. He opposed national
  14820. exceptionalism, he brought clarity to legal and policy debates, he
  14821. understood and predicted the impact of mass surveillance on the world,
  14822. and he laid the groundwork for resisting it. While serving on the Tor
  14823. Project's board of directors, he brought us his uncompromising focus
  14824. on technical excellence in the service of humankind. Caspar was an
  14825. inimitable force for good and a wonderful friend. He was kind,
  14826. humorous, generous, gallant, and believed we should protect one
  14827. another without exception. We honor him here for his ideals, his
  14828. efforts, and his accomplishments. Please honor his memory with works
  14829. that would make him proud.
  14830. Tor 0.2.7.5 is the first stable release in the Tor 0.2.7 series.
  14831. The 0.2.7 series adds a more secure identity key type for relays,
  14832. improves cryptography performance, resolves several longstanding
  14833. hidden-service performance issues, improves controller support for
  14834. hidden services, and includes small bugfixes and performance
  14835. improvements throughout the program. This release series also includes
  14836. more tests than before, and significant simplifications to which parts
  14837. of Tor invoke which others. For a full list of changes, see below.
  14838. o New system requirements:
  14839. - Tor no longer includes workarounds to support Libevent versions
  14840. before 1.3e. Libevent 2.0 or later is recommended. Closes
  14841. ticket 15248.
  14842. - Tor no longer supports copies of OpenSSL that are missing support
  14843. for Elliptic Curve Cryptography. (We began using ECC when
  14844. available in 0.2.4.8-alpha, for more safe and efficient key
  14845. negotiation.) In particular, support for at least one of P256 or
  14846. P224 is now required, with manual configuration needed if only
  14847. P224 is available. Resolves ticket 16140.
  14848. - Tor no longer supports versions of OpenSSL before 1.0. (If you are
  14849. on an operating system that has not upgraded to OpenSSL 1.0 or
  14850. later, and you compile Tor from source, you will need to install a
  14851. more recent OpenSSL to link Tor against.) These versions of
  14852. OpenSSL are still supported by the OpenSSL, but the numerous
  14853. cryptographic improvements in later OpenSSL releases makes them a
  14854. clear choice. Resolves ticket 16034.
  14855. o Major features (controller):
  14856. - Add the ADD_ONION and DEL_ONION commands that allow the creation
  14857. and management of hidden services via the controller. Closes
  14858. ticket 6411.
  14859. - New "GETINFO onions/current" and "GETINFO onions/detached"
  14860. commands to get information about hidden services created via the
  14861. controller. Part of ticket 6411.
  14862. - New HSFETCH command to launch a request for a hidden service
  14863. descriptor. Closes ticket 14847.
  14864. - New HSPOST command to upload a hidden service descriptor. Closes
  14865. ticket 3523. Patch by "DonnchaC".
  14866. o Major features (Ed25519 identity keys, Proposal 220):
  14867. - Add support for offline encrypted Ed25519 master keys. To use this
  14868. feature on your tor relay, run "tor --keygen" to make a new master
  14869. key (or to make a new signing key if you already have a master
  14870. key). Closes ticket 13642.
  14871. - All relays now maintain a stronger identity key, using the Ed25519
  14872. elliptic curve signature format. This master key is designed so
  14873. that it can be kept offline. Relays also generate an online
  14874. signing key, and a set of other Ed25519 keys and certificates.
  14875. These are all automatically regenerated and rotated as needed.
  14876. Implements part of ticket 12498.
  14877. - Directory authorities now vote on Ed25519 identity keys along with
  14878. RSA1024 keys. Implements part of ticket 12498.
  14879. - Directory authorities track which Ed25519 identity keys have been
  14880. used with which RSA1024 identity keys, and do not allow them to
  14881. vary freely. Implements part of ticket 12498.
  14882. - Microdescriptors now include Ed25519 identity keys. Implements
  14883. part of ticket 12498.
  14884. - Add a --newpass option to allow changing or removing the
  14885. passphrase of an encrypted key with tor --keygen. Implements part
  14886. of ticket 16769.
  14887. - Add a new OfflineMasterKey option to tell Tor never to try loading
  14888. or generating a secret Ed25519 identity key. You can use this in
  14889. combination with tor --keygen to manage offline and/or encrypted
  14890. Ed25519 keys. Implements ticket 16944.
  14891. - On receiving a HUP signal, check to see whether the Ed25519
  14892. signing key has changed, and reload it if so. Closes ticket 16790.
  14893. - Significant usability improvements for Ed25519 key management. Log
  14894. messages are better, and the code can recover from far more
  14895. failure conditions. Thanks to "s7r" for reporting and diagnosing
  14896. so many of these!
  14897. o Major features (ECC performance):
  14898. - Improve the runtime speed of Ed25519 signature verification by
  14899. using Ed25519-donna's batch verification support. Implements
  14900. ticket 16533.
  14901. - Improve the speed of Ed25519 operations and Curve25519 keypair
  14902. generation when built targeting 32 bit x86 platforms with SSE2
  14903. available. Implements ticket 16535.
  14904. - Improve the runtime speed of Ed25519 operations by using the
  14905. public-domain Ed25519-donna by Andrew M. ("floodyberry").
  14906. Implements ticket 16467.
  14907. - Improve the runtime speed of the ntor handshake by using an
  14908. optimized curve25519 basepoint scalarmult implementation from the
  14909. public-domain Ed25519-donna by Andrew M. ("floodyberry"), based on
  14910. ideas by Adam Langley. Implements ticket 9663.
  14911. o Major features (Hidden services):
  14912. - Hidden services, if using the EntryNodes option, are required to
  14913. use more than one EntryNode, in order to avoid a guard discovery
  14914. attack. (This would only affect people who had configured hidden
  14915. services and manually specified the EntryNodes option with a
  14916. single entry-node. The impact was that it would be easy to
  14917. remotely identify the guard node used by such a hidden service.
  14918. See ticket for more information.) Fixes ticket 14917.
  14919. - Add the torrc option HiddenServiceNumIntroductionPoints, to
  14920. specify a fixed number of introduction points. Its maximum value
  14921. is 10 and default is 3. Using this option can increase a hidden
  14922. service's reliability under load, at the cost of making it more
  14923. visible that the hidden service is facing extra load. Closes
  14924. ticket 4862.
  14925. - Remove the adaptive algorithm for choosing the number of
  14926. introduction points, which used to change the number of
  14927. introduction points (poorly) depending on the number of
  14928. connections the HS sees. Closes ticket 4862.
  14929. o Major features (onion key cross-certification):
  14930. - Relay descriptors now include signatures of their own identity
  14931. keys, made using the TAP and ntor onion keys. These signatures
  14932. allow relays to prove ownership of their own onion keys. Because
  14933. of this change, microdescriptors will no longer need to include
  14934. RSA identity keys. Implements proposal 228; closes ticket 12499.
  14935. o Major bugfixes (client-side privacy, also in 0.2.6.9):
  14936. - Properly separate out each SOCKSPort when applying stream
  14937. isolation. The error occurred because each port's session group
  14938. was being overwritten by a default value when the listener
  14939. connection was initialized. Fixes bug 16247; bugfix on
  14940. 0.2.6.3-alpha. Patch by "jojelino".
  14941. o Major bugfixes (hidden service clients, stability, also in 0.2.6.10):
  14942. - Stop refusing to store updated hidden service descriptors on a
  14943. client. This reverts commit 9407040c59218 (which indeed fixed bug
  14944. 14219, but introduced a major hidden service reachability
  14945. regression detailed in bug 16381). This is a temporary fix since
  14946. we can live with the minor issue in bug 14219 (it just results in
  14947. some load on the network) but the regression of 16381 is too much
  14948. of a setback. First-round fix for bug 16381; bugfix
  14949. on 0.2.6.3-alpha.
  14950. o Major bugfixes (hidden services):
  14951. - Revert commit that made directory authorities assign the HSDir
  14952. flag to relays without a DirPort; this was bad because such relays
  14953. can't handle BEGIN_DIR cells. Fixes bug 15850; bugfix
  14954. on 0.2.6.3-alpha.
  14955. - When cannibalizing a circuit for an introduction point, always
  14956. extend to the chosen exit node (creating a 4 hop circuit).
  14957. Previously Tor would use the current circuit exit node, which
  14958. changed the original choice of introduction point, and could cause
  14959. the hidden service to skip excluded introduction points or
  14960. reconnect to a skipped introduction point. Fixes bug 16260; bugfix
  14961. on 0.1.0.1-rc.
  14962. o Major bugfixes (memory leaks):
  14963. - Fix a memory leak in ed25519 batch signature checking. Fixes bug
  14964. 17398; bugfix on 0.2.6.1-alpha.
  14965. o Major bugfixes (open file limit):
  14966. - The open file limit wasn't checked before calling
  14967. tor_accept_socket_nonblocking(), which would make Tor exceed the
  14968. limit. Now, before opening a new socket, Tor validates the open
  14969. file limit just before, and if the max has been reached, return an
  14970. error. Fixes bug 16288; bugfix on 0.1.1.1-alpha.
  14971. o Major bugfixes (security, correctness):
  14972. - Fix an error that could cause us to read 4 bytes before the
  14973. beginning of an openssl string. This bug could be used to cause
  14974. Tor to crash on systems with unusual malloc implementations, or
  14975. systems with unusual hardening installed. Fixes bug 17404; bugfix
  14976. on 0.2.3.6-alpha.
  14977. o Major bugfixes (stability, also in 0.2.6.10):
  14978. - Stop crashing with an assertion failure when parsing certain kinds
  14979. of malformed or truncated microdescriptors. Fixes bug 16400;
  14980. bugfix on 0.2.6.1-alpha. Found by "torkeln"; fix based on a patch
  14981. by "cypherpunks_backup".
  14982. - Stop random client-side assertion failures that could occur when
  14983. connecting to a busy hidden service, or connecting to a hidden
  14984. service while a NEWNYM is in progress. Fixes bug 16013; bugfix
  14985. on 0.1.0.1-rc.
  14986. o Minor features (client, SOCKS):
  14987. - Add GroupWritable and WorldWritable options to unix-socket based
  14988. SocksPort and ControlPort options. These options apply to a single
  14989. socket, and override {Control,Socks}SocketsGroupWritable. Closes
  14990. ticket 15220.
  14991. - Relax the validation done to hostnames in SOCKS5 requests, and
  14992. allow a single trailing '.' to cope with clients that pass FQDNs
  14993. using that syntax to explicitly indicate that the domain name is
  14994. fully-qualified. Fixes bug 16674; bugfix on 0.2.6.2-alpha.
  14995. - Relax the validation of hostnames in SOCKS5 requests, allowing the
  14996. character '_' to appear, in order to cope with domains observed in
  14997. the wild that are serving non-RFC compliant records. Resolves
  14998. ticket 16430.
  14999. o Minor features (client-side privacy):
  15000. - New KeepAliveIsolateSOCKSAuth option to indefinitely extend circuit
  15001. lifespan when IsolateSOCKSAuth and streams with SOCKS
  15002. authentication are attached to the circuit. This allows
  15003. applications like TorBrowser to manage circuit lifetime on their
  15004. own. Implements feature 15482.
  15005. - When logging malformed hostnames from SOCKS5 requests, respect
  15006. SafeLogging configuration. Fixes bug 16891; bugfix on 0.1.1.16-rc.
  15007. o Minor features (clock-jump tolerance):
  15008. - Recover better when our clock jumps back many hours, like might
  15009. happen for Tails or Whonix users who start with a very wrong
  15010. hardware clock, use Tor to discover a more accurate time, and then
  15011. fix their clock. Resolves part of ticket 8766.
  15012. o Minor features (command-line interface):
  15013. - Make --hash-password imply --hush to prevent unnecessary noise.
  15014. Closes ticket 15542. Patch from "cypherpunks".
  15015. - Print a warning whenever we find a relative file path being used
  15016. as torrc option. Resolves issue 14018.
  15017. o Minor features (compilation):
  15018. - Give a warning as early as possible when trying to build with an
  15019. unsupported OpenSSL version. Closes ticket 16901.
  15020. - Use C99 variadic macros when the compiler is not GCC. This avoids
  15021. failing compilations on MSVC, and fixes a log-file-based race
  15022. condition in our old workarounds. Original patch from Gisle Vanem.
  15023. o Minor features (control protocol):
  15024. - Support network-liveness GETINFO key and NETWORK_LIVENESS event in
  15025. the control protocol. Resolves ticket 15358.
  15026. o Minor features (controller):
  15027. - Add DirAuthority lines for default directory authorities to the
  15028. output of the "GETINFO config/defaults" command if not already
  15029. present. Implements ticket 14840.
  15030. - Controllers can now use "GETINFO hs/client/desc/id/..." to
  15031. retrieve items from the client's hidden service descriptor cache.
  15032. Closes ticket 14845.
  15033. - Implement a new controller command "GETINFO status/fresh-relay-
  15034. descs" to fetch a descriptor/extrainfo pair that was generated on
  15035. demand just for the controller's use. Implements ticket 14784.
  15036. o Minor features (directory authorities):
  15037. - Directory authorities no longer vote against the "Fast", "Stable",
  15038. and "HSDir" flags just because they were going to vote against
  15039. "Running": if the consensus turns out to be that the router was
  15040. running, then the authority's vote should count. Patch from Peter
  15041. Retzlaff; closes issue 8712.
  15042. o Minor features (directory authorities, security, also in 0.2.6.9):
  15043. - The HSDir flag given by authorities now requires the Stable flag.
  15044. For the current network, this results in going from 2887 to 2806
  15045. HSDirs. Also, it makes it harder for an attacker to launch a sybil
  15046. attack by raising the effort for a relay to become Stable to
  15047. require at the very least 7 days, while maintaining the 96 hours
  15048. uptime requirement for HSDir. Implements ticket 8243.
  15049. o Minor features (DoS-resistance):
  15050. - Make it harder for attackers to overload hidden services with
  15051. introductions, by blocking multiple introduction requests on the
  15052. same circuit. Resolves ticket 15515.
  15053. o Minor features (geoip):
  15054. - Update geoip and geoip6 to the October 9 2015 Maxmind GeoLite2
  15055. Country database.
  15056. o Minor features (hidden services):
  15057. - Add the new options "HiddenServiceMaxStreams" and
  15058. "HiddenServiceMaxStreamsCloseCircuit" to allow hidden services to
  15059. limit the maximum number of simultaneous streams per circuit, and
  15060. optionally tear down the circuit when the limit is exceeded. Part
  15061. of ticket 16052.
  15062. - Client now uses an introduction point failure cache to know when
  15063. to fetch or keep a descriptor in their cache. Previously, failures
  15064. were recorded implicitly, but not explicitly remembered. Closes
  15065. ticket 16389.
  15066. - Relays need to have the Fast flag to get the HSDir flag. As this
  15067. is being written, we'll go from 2745 HSDirs down to 2342, a ~14%
  15068. drop. This change should make some attacks against the hidden
  15069. service directory system harder. Fixes ticket 15963.
  15070. - Turn on hidden service statistics collection by setting the torrc
  15071. option HiddenServiceStatistics to "1" by default. (This keeps
  15072. track only of the fraction of traffic used by hidden services, and
  15073. the total number of hidden services in existence.) Closes
  15074. ticket 15254.
  15075. - To avoid leaking HS popularity, don't cycle the introduction point
  15076. when we've handled a fixed number of INTRODUCE2 cells but instead
  15077. cycle it when a random number of introductions is reached, thus
  15078. making it more difficult for an attacker to find out the amount of
  15079. clients that have used the introduction point for a specific HS.
  15080. Closes ticket 15745.
  15081. o Minor features (logging):
  15082. - Include the Tor version in all LD_BUG log messages, since people
  15083. tend to cut and paste those into the bugtracker. Implements
  15084. ticket 15026.
  15085. o Minor features (pluggable transports):
  15086. - When launching managed pluggable transports on Linux systems,
  15087. attempt to have the kernel deliver a SIGTERM on tor exit if the
  15088. pluggable transport process is still running. Resolves
  15089. ticket 15471.
  15090. - When launching managed pluggable transports, setup a valid open
  15091. stdin in the child process that can be used to detect if tor has
  15092. terminated. The "TOR_PT_EXIT_ON_STDIN_CLOSE" environment variable
  15093. can be used by implementations to detect this new behavior.
  15094. Resolves ticket 15435.
  15095. o Minor bugfixes (torrc exit policies):
  15096. - In each instance above, usage advice is provided to avoid the
  15097. message. Resolves ticket 16069. Patch by "teor". Fixes part of bug
  15098. 16069; bugfix on 0.2.4.7-alpha.
  15099. - In torrc, "accept6 *" and "reject6 *" ExitPolicy lines now only
  15100. produce IPv6 wildcard addresses. Previously they would produce
  15101. both IPv4 and IPv6 wildcard addresses. Patch by "teor". Fixes part
  15102. of bug 16069; bugfix on 0.2.4.7-alpha.
  15103. - When parsing torrc ExitPolicies, we now issue an info-level
  15104. message when expanding an "accept/reject *" line to include both
  15105. IPv4 and IPv6 wildcard addresses. Related to ticket 16069.
  15106. - When parsing torrc ExitPolicies, we now warn for a number of cases
  15107. where the user's intent is likely to differ from Tor's actual
  15108. behavior. These include: using an IPv4 address with an accept6 or
  15109. reject6 line; using "private" on an accept6 or reject6 line; and
  15110. including any ExitPolicy lines after accept *:* or reject *:*.
  15111. Related to ticket 16069.
  15112. o Minor bugfixes (command-line interface):
  15113. - When "--quiet" is provided along with "--validate-config", do not
  15114. write anything to stdout on success. Fixes bug 14994; bugfix
  15115. on 0.2.3.3-alpha.
  15116. - When complaining about bad arguments to "--dump-config", use
  15117. stderr, not stdout.
  15118. - Print usage information for --dump-config when it is used without
  15119. an argument. Also, fix the error message to use different wording
  15120. and add newline at the end. Fixes bug 15541; bugfix
  15121. on 0.2.5.1-alpha.
  15122. o Minor bugfixes (compilation):
  15123. - Fix compilation of sandbox.c with musl-libc. Fixes bug 17347;
  15124. bugfix on 0.2.5.1-alpha. Patch from 'jamestk'.
  15125. - Repair compilation with the most recent (unreleased, alpha)
  15126. vesions of OpenSSL 1.1. Fixes part of ticket 17237.
  15127. o Minor bugfixes (compilation, also in 0.2.6.9):
  15128. - Build with --enable-systemd correctly when libsystemd is
  15129. installed, but systemd is not. Fixes bug 16164; bugfix on
  15130. 0.2.6.3-alpha. Patch from Peter Palfrader.
  15131. o Minor bugfixes (configuration, unit tests):
  15132. - Only add the default fallback directories when the DirAuthorities,
  15133. AlternateDirAuthority, and FallbackDir directory config options
  15134. are set to their defaults. The default fallback directory list is
  15135. currently empty, this fix will only change tor's behavior when it
  15136. has default fallback directories. Includes unit tests for
  15137. consider_adding_dir_servers(). Fixes bug 15642; bugfix on
  15138. 90f6071d8dc0 in 0.2.4.7-alpha. Patch by "teor".
  15139. o Minor bugfixes (controller):
  15140. - Add the descriptor ID in each HS_DESC control event. It was
  15141. missing, but specified in control-spec.txt. Fixes bug 15881;
  15142. bugfix on 0.2.5.2-alpha.
  15143. o Minor bugfixes (correctness):
  15144. - For correctness, avoid modifying a constant string in
  15145. handle_control_postdescriptor. Fixes bug 15546; bugfix
  15146. on 0.1.1.16-rc.
  15147. - Remove side-effects from tor_assert() calls. This was harmless,
  15148. because we never disable assertions, but it is bad style and
  15149. unnecessary. Fixes bug 15211; bugfix on 0.2.5.5, 0.2.2.36,
  15150. and 0.2.0.10.
  15151. - When calling channel_free_list(), avoid calling smartlist_remove()
  15152. while inside a FOREACH loop. This partially reverts commit
  15153. 17356fe7fd96af where the correct SMARTLIST_DEL_CURRENT was
  15154. incorrectly removed. Fixes bug 16924; bugfix on 0.2.4.4-alpha.
  15155. o Minor bugfixes (crypto error-handling, also in 0.2.6.10):
  15156. - Check for failures from crypto_early_init, and refuse to continue.
  15157. A previous typo meant that we could keep going with an
  15158. uninitialized crypto library, and would have OpenSSL initialize
  15159. its own PRNG. Fixes bug 16360; bugfix on 0.2.5.2-alpha, introduced
  15160. when implementing ticket 4900. Patch by "teor".
  15161. o Minor bugfixes (hidden service):
  15162. - Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
  15163. a client authorized hidden service. Fixes bug 15823; bugfix
  15164. on 0.2.1.6-alpha.
  15165. - Remove an extraneous newline character from the end of hidden
  15166. service descriptors. Fixes bug 15296; bugfix on 0.2.0.10-alpha.
  15167. o Minor bugfixes (Linux seccomp2 sandbox):
  15168. - Use the sandbox in tor_open_cloexec whether or not O_CLOEXEC is
  15169. defined. Patch by "teor". Fixes bug 16515; bugfix on 0.2.3.1-alpha.
  15170. - Allow bridge authorities to run correctly under the seccomp2
  15171. sandbox. Fixes bug 16964; bugfix on 0.2.5.1-alpha.
  15172. - Add the "hidserv-stats" filename to our sandbox filter for the
  15173. HiddenServiceStatistics option to work properly. Fixes bug 17354;
  15174. bugfix on 0.2.6.2-alpha. Patch from David Goulet.
  15175. o Minor bugfixes (Linux seccomp2 sandbox, also in 0.2.6.10):
  15176. - Allow pipe() and pipe2() syscalls in the seccomp2 sandbox: we need
  15177. these when eventfd2() support is missing. Fixes bug 16363; bugfix
  15178. on 0.2.6.3-alpha. Patch from "teor".
  15179. o Minor bugfixes (Linux seccomp2 sandbox, also in 0.2.6.9):
  15180. - Allow systemd connections to work with the Linux seccomp2 sandbox
  15181. code. Fixes bug 16212; bugfix on 0.2.6.2-alpha. Patch by
  15182. Peter Palfrader.
  15183. - Fix sandboxing to work when running as a relay, by allowing the
  15184. renaming of secret_id_key, and allowing the eventfd2 and futex
  15185. syscalls. Fixes bug 16244; bugfix on 0.2.6.1-alpha. Patch by
  15186. Peter Palfrader.
  15187. o Minor bugfixes (logging):
  15188. - When building Tor under Clang, do not include an extra set of
  15189. parentheses in log messages that include function names. Fixes bug
  15190. 15269; bugfix on every released version of Tor when compiled with
  15191. recent enough Clang.
  15192. o Minor bugfixes (network):
  15193. - When attempting to use fallback technique for network interface
  15194. lookup, disregard loopback and multicast addresses since they are
  15195. unsuitable for public communications.
  15196. o Minor bugfixes (open file limit):
  15197. - Fix set_max_file_descriptors() to set by default the max open file
  15198. limit to the current limit when setrlimit() fails. Fixes bug
  15199. 16274; bugfix on tor- 0.2.0.10-alpha. Patch by dgoulet.
  15200. o Minor bugfixes (portability):
  15201. - Check correctly for Windows socket errors in the workqueue
  15202. backend. Fixes bug 16741; bugfix on 0.2.6.3-alpha.
  15203. - Try harder to normalize the exit status of the Tor process to the
  15204. standard-provided range. Fixes bug 16975; bugfix on every version
  15205. of Tor ever.
  15206. - Use libexecinfo on FreeBSD to enable backtrace support. Fixes part
  15207. of bug 17151; bugfix on 0.2.5.2-alpha. Patch from Marcin Cieślak.
  15208. o Minor bugfixes (relay):
  15209. - Ensure that worker threads actually exit when a fatal error or
  15210. shutdown is indicated. This fix doesn't currently affect the
  15211. behavior of Tor, because Tor workers never indicates fatal error
  15212. or shutdown except in the unit tests. Fixes bug 16868; bugfix
  15213. on 0.2.6.3-alpha.
  15214. - Fix a rarely-encountered memory leak when failing to initialize
  15215. the thread pool. Fixes bug 16631; bugfix on 0.2.6.3-alpha. Patch
  15216. from "cypherpunks".
  15217. - Unblock threads before releasing the work queue mutex to ensure
  15218. predictable scheduling behavior. Fixes bug 16644; bugfix
  15219. on 0.2.6.3-alpha.
  15220. o Minor bugfixes (security, exit policies):
  15221. - ExitPolicyRejectPrivate now also rejects the relay's published
  15222. IPv6 address (if any), and any publicly routable IPv4 or IPv6
  15223. addresses on any local interfaces. ticket 17027. Patch by "teor".
  15224. Fixes bug 17027; bugfix on 0.2.0.11-alpha.
  15225. o Minor bugfixes (statistics):
  15226. - Disregard the ConnDirectionStatistics torrc options when Tor is
  15227. not a relay since in that mode of operation no sensible data is
  15228. being collected and because Tor might run into measurement hiccups
  15229. when running as a client for some time, then becoming a relay.
  15230. Fixes bug 15604; bugfix on 0.2.2.35.
  15231. o Minor bugfixes (systemd):
  15232. - Tor's systemd unit file no longer contains extraneous spaces.
  15233. These spaces would sometimes confuse tools like deb-systemd-
  15234. helper. Fixes bug 16162; bugfix on 0.2.5.5-alpha.
  15235. o Minor bugfixes (test networks):
  15236. - When self-testing reachability, use ExtendAllowPrivateAddresses to
  15237. determine if local/private addresses imply reachability. The
  15238. previous fix used TestingTorNetwork, which implies
  15239. ExtendAllowPrivateAddresses, but this excluded rare configurations
  15240. where ExtendAllowPrivateAddresses is set but TestingTorNetwork is
  15241. not. Fixes bug 15771; bugfix on 0.2.6.1-alpha. Patch by "teor",
  15242. issue discovered by CJ Ess.
  15243. o Minor bugfixes (tests, also in 0.2.6.9):
  15244. - Fix a crash in the unit tests when built with MSVC2013. Fixes bug
  15245. 16030; bugfix on 0.2.6.2-alpha. Patch from "NewEraCracker".
  15246. o Code simplification and refactoring:
  15247. - Change the function that's called when we need to retry all
  15248. downloads so that it only reschedules the downloads to happen
  15249. immediately, rather than launching them all at once itself. This
  15250. further simplifies Tor's callgraph.
  15251. - Define WINVER and _WIN32_WINNT centrally, in orconfig.h, in order
  15252. to ensure they remain consistent and visible everywhere.
  15253. - Move some format-parsing functions out of crypto.c and
  15254. crypto_curve25519.c into crypto_format.c and/or util_format.c.
  15255. - Move the client-only parts of init_keys() into a separate
  15256. function. Closes ticket 16763.
  15257. - Move the hacky fallback code out of get_interface_address6() into
  15258. separate function and get it covered with unit-tests. Resolves
  15259. ticket 14710.
  15260. - Refactor hidden service client-side cache lookup to intelligently
  15261. report its various failure cases, and disentangle failure cases
  15262. involving a lack of introduction points. Closes ticket 14391.
  15263. - Remove some vestigial workarounds for the MSVC6 compiler. We
  15264. haven't supported that in ages.
  15265. - Remove the unused "nulterminate" argument from buf_pullup().
  15266. - Simplify the microdesc_free() implementation so that it no longer
  15267. appears (to code analysis tools) to potentially invoke a huge
  15268. suite of other microdesc functions.
  15269. - Simply the control graph further by deferring the inner body of
  15270. directory_all_unreachable() into a callback. Closes ticket 16762.
  15271. - The link authentication code has been refactored for better
  15272. testability and reliability. It now uses code generated with the
  15273. "trunnel" binary encoding generator, to reduce the risk of bugs
  15274. due to programmer error. Done as part of ticket 12498.
  15275. - Treat the loss of an owning controller as equivalent to a SIGTERM
  15276. signal. This removes a tiny amount of duplicated code, and
  15277. simplifies our callgraph. Closes ticket 16788.
  15278. - Use our own Base64 encoder instead of OpenSSL's, to allow more
  15279. control over the output. Part of ticket 15652.
  15280. - When generating an event to send to the controller, we no longer
  15281. put the event over the network immediately. Instead, we queue
  15282. these events, and use a Libevent callback to deliver them. This
  15283. change simplifies Tor's callgraph by reducing the number of
  15284. functions from which all other Tor functions are reachable. Closes
  15285. ticket 16695.
  15286. - Wrap Windows-only C files inside '#ifdef _WIN32' so that tools
  15287. that try to scan or compile every file on Unix won't decide that
  15288. they are broken.
  15289. o Documentation:
  15290. - Fix capitalization of SOCKS in sample torrc. Closes ticket 15609.
  15291. - Improve the descriptions of statistics-related torrc options in
  15292. the manpage to describe rationale and possible uses cases. Fixes
  15293. issue 15550.
  15294. - Improve the layout and formatting of ./configure --help messages.
  15295. Closes ticket 15024. Patch from "cypherpunks".
  15296. - Include a specific and (hopefully) accurate documentation of the
  15297. torrc file's meta-format in doc/torrc_format.txt. This is mainly
  15298. of interest to people writing programs to parse or generate torrc
  15299. files. This document is not a commitment to long-term
  15300. compatibility; some aspects of the current format are a bit
  15301. ridiculous. Closes ticket 2325.
  15302. - Include the TUNING document in our source tarball. It is referred
  15303. to in the ChangeLog and an error message. Fixes bug 16929; bugfix
  15304. on 0.2.6.1-alpha.
  15305. - Note that HiddenServicePorts can take a unix domain socket. Closes
  15306. ticket 17364.
  15307. - Recommend a 40 GB example AccountingMax in torrc.sample rather
  15308. than a 4 GB max. Closes ticket 16742.
  15309. - Standardize on the term "server descriptor" in the manual page.
  15310. Previously, we had used "router descriptor", "server descriptor",
  15311. and "relay descriptor" interchangeably. Part of ticket 14987.
  15312. - Advise users on how to configure separate IPv4 and IPv6 exit
  15313. policies in the manpage and sample torrcs. Related to ticket 16069.
  15314. - Fix an error in the manual page and comments for
  15315. TestingDirAuthVoteHSDir[IsStrict], which suggested that a HSDir
  15316. required "ORPort connectivity". While this is true, it is in no
  15317. way unique to the HSDir flag. Of all the flags, only HSDirs need a
  15318. DirPort configured in order for the authorities to assign that
  15319. particular flag. Patch by "teor". Fixed as part of 14882; bugfix
  15320. on 0.2.6.3-alpha.
  15321. - Fix the usage message of tor-resolve(1) so that it no longer lists
  15322. the removed -F option. Fixes bug 16913; bugfix on 0.2.2.28-beta.
  15323. o Removed code:
  15324. - Remove `USE_OPENSSL_BASE64` and the corresponding fallback code
  15325. and always use the internal Base64 decoder. The internal decoder
  15326. has been part of tor since 0.2.0.10-alpha, and no one should
  15327. be using the OpenSSL one. Part of ticket 15652.
  15328. - Remove the 'tor_strclear()' function; use memwipe() instead.
  15329. Closes ticket 14922.
  15330. - Remove the code that would try to aggressively flush controller
  15331. connections while writing to them. This code was introduced in
  15332. 0.1.2.7-alpha, in order to keep output buffers from exceeding
  15333. their limits. But there is no longer a maximum output buffer size,
  15334. and flushing data in this way caused some undesirable recursions
  15335. in our call graph. Closes ticket 16480.
  15336. - The internal pure-C tor-fw-helper tool is now removed from the Tor
  15337. distribution, in favor of the pure-Go clone available from
  15338. https://gitweb.torproject.org/tor-fw-helper.git/ . The libraries
  15339. used by the C tor-fw-helper are not, in our opinion, very
  15340. confidence- inspiring in their secure-programming techniques.
  15341. Closes ticket 13338.
  15342. o Removed features:
  15343. - Remove the (seldom-used) DynamicDHGroups feature. For anti-
  15344. fingerprinting we now recommend pluggable transports; for forward-
  15345. secrecy in TLS, we now use the P-256 group. Closes ticket 13736.
  15346. - Remove the HidServDirectoryV2 option. Now all relays offer to
  15347. store hidden service descriptors. Related to 16543.
  15348. - Remove the VoteOnHidServDirectoriesV2 option, since all
  15349. authorities have long set it to 1. Closes ticket 16543.
  15350. - Remove the undocumented "--digests" command-line option. It
  15351. complicated our build process, caused subtle build issues on
  15352. multiple platforms, and is now redundant since we started
  15353. including git version identifiers. Closes ticket 14742.
  15354. - Tor no longer contains checks for ancient directory cache versions
  15355. that didn't know about microdescriptors.
  15356. - Tor no longer contains workarounds for stat files generated by
  15357. super-old versions of Tor that didn't choose guards sensibly.
  15358. o Testing:
  15359. - The test-network.sh script now supports performance testing.
  15360. Requires corresponding chutney performance testing changes. Patch
  15361. by "teor". Closes ticket 14175.
  15362. - Add a new set of callgraph analysis scripts that use clang to
  15363. produce a list of which Tor functions are reachable from which
  15364. other Tor functions. We're planning to use these to help simplify
  15365. our code structure by identifying illogical dependencies.
  15366. - Add new 'test-full' and 'test-full-online' targets to run all
  15367. tests, including integration tests with stem and chutney.
  15368. - Autodetect CHUTNEY_PATH if the chutney and Tor sources are side-
  15369. by-side in the same parent directory. Closes ticket 16903. Patch
  15370. by "teor".
  15371. - Document use of coverity, clang static analyzer, and clang dynamic
  15372. undefined behavior and address sanitizers in doc/HACKING. Include
  15373. detailed usage instructions in the blacklist. Patch by "teor".
  15374. Closes ticket 15817.
  15375. - Make "bridges+hs" the default test network. This tests almost all
  15376. tor functionality during make test-network, while allowing tests
  15377. to succeed on non-IPv6 systems. Requires chutney commit 396da92 in
  15378. test-network-bridges-hs. Closes tickets 16945 (tor) and 16946
  15379. (chutney). Patches by "teor".
  15380. - Make the test-workqueue test work on Windows by initializing the
  15381. network before we begin.
  15382. - New make target (make test-network-all) to run multiple applicable
  15383. chutney test cases. Patch from Teor; closes 16953.
  15384. - Now that OpenSSL has its own scrypt implementation, add an unit
  15385. test that checks for interoperability between libscrypt_scrypt()
  15386. and OpenSSL's EVP_PBE_scrypt() so that we could not use libscrypt
  15387. and rely on EVP_PBE_scrypt() whenever possible. Resolves
  15388. ticket 16189.
  15389. - The link authentication protocol code now has extensive tests.
  15390. - The relay descriptor signature testing code now has
  15391. extensive tests.
  15392. - The test_workqueue program now runs faster, and is enabled by
  15393. default as a part of "make check".
  15394. - Unit test dns_resolve(), dns_clip_ttl() and dns_get_expiry_ttl()
  15395. functions in dns.c. Implements a portion of ticket 16831.
  15396. - Use environment variables rather than autoconf substitutions to
  15397. send variables from the build system to the test scripts. This
  15398. change should be easier to maintain, and cause 'make distcheck' to
  15399. work better than before. Fixes bug 17148.
  15400. - When building Tor with testing coverage enabled, run Chutney tests
  15401. (if any) using the 'tor-cov' coverage binary.
  15402. - When running test-network or test-stem, check for the absence of
  15403. stem/chutney before doing any build operations.
  15404. - Add a test to verify that the compiler does not eliminate our
  15405. memwipe() implementation. Closes ticket 15377.
  15406. - Add make rule `check-changes` to verify the format of changes
  15407. files. Closes ticket 15180.
  15408. - Add unit tests for control_event_is_interesting(). Add a compile-
  15409. time check that the number of events doesn't exceed the capacity
  15410. of control_event_t.event_mask. Closes ticket 15431, checks for
  15411. bugs similar to 13085. Patch by "teor".
  15412. - Command-line argument tests moved to Stem. Resolves ticket 14806.
  15413. - Integrate the ntor, backtrace, and zero-length keys tests into the
  15414. automake test suite. Closes ticket 15344.
  15415. - Remove assertions during builds to determine Tor's test coverage.
  15416. We don't want to trigger these even in assertions, so including
  15417. them artificially makes our branch coverage look worse than it is.
  15418. This patch provides the new test-stem-full and coverage-html-full
  15419. configure options. Implements ticket 15400.
  15420. - New TestingDirAuthVote{Exit,Guard,HSDir}IsStrict flags to
  15421. explicitly manage consensus flags in testing networks. Patch by
  15422. "robgjansen", modified by "teor". Implements part of ticket 14882.
  15423. - Check for matching value in server response in ntor_ref.py. Fixes
  15424. bug 15591; bugfix on 0.2.4.8-alpha. Reported and fixed
  15425. by "joelanders".
  15426. - Set the severity correctly when testing
  15427. get_interface_addresses_ifaddrs() and
  15428. get_interface_addresses_win32(), so that the tests fail gracefully
  15429. instead of triggering an assertion. Fixes bug 15759; bugfix on
  15430. 0.2.6.3-alpha. Reported by Nicolas Derive.
  15431. Changes in version 0.2.6.10 - 2015-07-12
  15432. Tor version 0.2.6.10 fixes some significant stability and hidden
  15433. service client bugs, bulletproofs the cryptography init process, and
  15434. fixes a bug when using the sandbox code with some older versions of
  15435. Linux. Everyone running an older version, especially an older version
  15436. of 0.2.6, should upgrade.
  15437. o Major bugfixes (hidden service clients, stability):
  15438. - Stop refusing to store updated hidden service descriptors on a
  15439. client. This reverts commit 9407040c59218 (which indeed fixed bug
  15440. 14219, but introduced a major hidden service reachability
  15441. regression detailed in bug 16381). This is a temporary fix since
  15442. we can live with the minor issue in bug 14219 (it just results in
  15443. some load on the network) but the regression of 16381 is too much
  15444. of a setback. First-round fix for bug 16381; bugfix
  15445. on 0.2.6.3-alpha.
  15446. o Major bugfixes (stability):
  15447. - Stop crashing with an assertion failure when parsing certain kinds
  15448. of malformed or truncated microdescriptors. Fixes bug 16400;
  15449. bugfix on 0.2.6.1-alpha. Found by "torkeln"; fix based on a patch
  15450. by "cypherpunks_backup".
  15451. - Stop random client-side assertion failures that could occur when
  15452. connecting to a busy hidden service, or connecting to a hidden
  15453. service while a NEWNYM is in progress. Fixes bug 16013; bugfix
  15454. on 0.1.0.1-rc.
  15455. o Minor features (geoip):
  15456. - Update geoip to the June 3 2015 Maxmind GeoLite2 Country database.
  15457. - Update geoip6 to the June 3 2015 Maxmind GeoLite2 Country database.
  15458. o Minor bugfixes (crypto error-handling):
  15459. - Check for failures from crypto_early_init, and refuse to continue.
  15460. A previous typo meant that we could keep going with an
  15461. uninitialized crypto library, and would have OpenSSL initialize
  15462. its own PRNG. Fixes bug 16360; bugfix on 0.2.5.2-alpha, introduced
  15463. when implementing ticket 4900. Patch by "teor".
  15464. o Minor bugfixes (Linux seccomp2 sandbox):
  15465. - Allow pipe() and pipe2() syscalls in the seccomp2 sandbox: we need
  15466. these when eventfd2() support is missing. Fixes bug 16363; bugfix
  15467. on 0.2.6.3-alpha. Patch from "teor".
  15468. Changes in version 0.2.6.9 - 2015-06-11
  15469. Tor 0.2.6.9 fixes a regression in the circuit isolation code, increases the
  15470. requirements for receiving an HSDir flag, and addresses some other small
  15471. bugs in the systemd and sandbox code. Clients using circuit isolation
  15472. should upgrade; all directory authorities should upgrade.
  15473. o Major bugfixes (client-side privacy):
  15474. - Properly separate out each SOCKSPort when applying stream
  15475. isolation. The error occurred because each port's session group was
  15476. being overwritten by a default value when the listener connection
  15477. was initialized. Fixes bug 16247; bugfix on 0.2.6.3-alpha. Patch
  15478. by "jojelino".
  15479. o Minor feature (directory authorities, security):
  15480. - The HSDir flag given by authorities now requires the Stable flag.
  15481. For the current network, this results in going from 2887 to 2806
  15482. HSDirs. Also, it makes it harder for an attacker to launch a sybil
  15483. attack by raising the effort for a relay to become Stable which
  15484. takes at the very least 7 days to do so and by keeping the 96
  15485. hours uptime requirement for HSDir. Implements ticket 8243.
  15486. o Minor bugfixes (compilation):
  15487. - Build with --enable-systemd correctly when libsystemd is
  15488. installed, but systemd is not. Fixes bug 16164; bugfix on
  15489. 0.2.6.3-alpha. Patch from Peter Palfrader.
  15490. o Minor bugfixes (Linux seccomp2 sandbox):
  15491. - Fix sandboxing to work when running as a relaymby renaming of
  15492. secret_id_key, and allowing the eventfd2 and futex syscalls. Fixes
  15493. bug 16244; bugfix on 0.2.6.1-alpha. Patch by Peter Palfrader.
  15494. - Allow systemd connections to work with the Linux seccomp2 sandbox
  15495. code. Fixes bug 16212; bugfix on 0.2.6.2-alpha. Patch by
  15496. Peter Palfrader.
  15497. o Minor bugfixes (tests):
  15498. - Fix a crash in the unit tests when built with MSVC2013. Fixes bug
  15499. 16030; bugfix on 0.2.6.2-alpha. Patch from "NewEraCracker".
  15500. Changes in version 0.2.6.8 - 2015-05-21
  15501. Tor 0.2.6.8 fixes a bit of dodgy code in parsing INTRODUCE2 cells, and
  15502. fixes an authority-side bug in assigning the HSDir flag. All directory
  15503. authorities should upgrade.
  15504. o Major bugfixes (hidden services, backport from 0.2.7.1-alpha):
  15505. - Revert commit that made directory authorities assign the HSDir
  15506. flag to relays without a DirPort; this was bad because such relays
  15507. can't handle BEGIN_DIR cells. Fixes bug 15850; bugfix
  15508. on 0.2.6.3-alpha.
  15509. o Minor bugfixes (hidden service, backport from 0.2.7.1-alpha):
  15510. - Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
  15511. a client authorized hidden service. Fixes bug 15823; bugfix
  15512. on 0.2.1.6-alpha.
  15513. o Minor features (geoip):
  15514. - Update geoip to the April 8 2015 Maxmind GeoLite2 Country database.
  15515. - Update geoip6 to the April 8 2015 Maxmind GeoLite2
  15516. Country database.
  15517. Changes in version 0.2.6.7 - 2015-04-06
  15518. Tor 0.2.6.7 fixes two security issues that could be used by an
  15519. attacker to crash hidden services, or crash clients visiting hidden
  15520. services. Hidden services should upgrade as soon as possible; clients
  15521. should upgrade whenever packages become available.
  15522. This release also contains two simple improvements to make hidden
  15523. services a bit less vulnerable to denial-of-service attacks.
  15524. o Major bugfixes (security, hidden service):
  15525. - Fix an issue that would allow a malicious client to trigger an
  15526. assertion failure and halt a hidden service. Fixes bug 15600;
  15527. bugfix on 0.2.1.6-alpha. Reported by "disgleirio".
  15528. - Fix a bug that could cause a client to crash with an assertion
  15529. failure when parsing a malformed hidden service descriptor. Fixes
  15530. bug 15601; bugfix on 0.2.1.5-alpha. Found by "DonnchaC".
  15531. o Minor features (DoS-resistance, hidden service):
  15532. - Introduction points no longer allow multiple INTRODUCE1 cells to
  15533. arrive on the same circuit. This should make it more expensive for
  15534. attackers to overwhelm hidden services with introductions.
  15535. Resolves ticket 15515.
  15536. - Decrease the amount of reattempts that a hidden service performs
  15537. when its rendezvous circuits fail. This reduces the computational
  15538. cost for running a hidden service under heavy load. Resolves
  15539. ticket 11447.
  15540. Changes in version 0.2.5.12 - 2015-04-06
  15541. Tor 0.2.5.12 backports two fixes from 0.2.6.7 for security issues that
  15542. could be used by an attacker to crash hidden services, or crash clients
  15543. visiting hidden services. Hidden services should upgrade as soon as
  15544. possible; clients should upgrade whenever packages become available.
  15545. This release also backports a simple improvement to make hidden
  15546. services a bit less vulnerable to denial-of-service attacks.
  15547. o Major bugfixes (security, hidden service):
  15548. - Fix an issue that would allow a malicious client to trigger an
  15549. assertion failure and halt a hidden service. Fixes bug 15600;
  15550. bugfix on 0.2.1.6-alpha. Reported by "disgleirio".
  15551. - Fix a bug that could cause a client to crash with an assertion
  15552. failure when parsing a malformed hidden service descriptor. Fixes
  15553. bug 15601; bugfix on 0.2.1.5-alpha. Found by "DonnchaC".
  15554. o Minor features (DoS-resistance, hidden service):
  15555. - Introduction points no longer allow multiple INTRODUCE1 cells to
  15556. arrive on the same circuit. This should make it more expensive for
  15557. attackers to overwhelm hidden services with introductions.
  15558. Resolves ticket 15515.
  15559. Changes in version 0.2.4.27 - 2015-04-06
  15560. Tor 0.2.4.27 backports two fixes from 0.2.6.7 for security issues that
  15561. could be used by an attacker to crash hidden services, or crash clients
  15562. visiting hidden services. Hidden services should upgrade as soon as
  15563. possible; clients should upgrade whenever packages become available.
  15564. This release also backports a simple improvement to make hidden
  15565. services a bit less vulnerable to denial-of-service attacks.
  15566. o Major bugfixes (security, hidden service):
  15567. - Fix an issue that would allow a malicious client to trigger an
  15568. assertion failure and halt a hidden service. Fixes bug 15600;
  15569. bugfix on 0.2.1.6-alpha. Reported by "disgleirio".
  15570. - Fix a bug that could cause a client to crash with an assertion
  15571. failure when parsing a malformed hidden service descriptor. Fixes
  15572. bug 15601; bugfix on 0.2.1.5-alpha. Found by "DonnchaC".
  15573. o Minor features (DoS-resistance, hidden service):
  15574. - Introduction points no longer allow multiple INTRODUCE1 cells to
  15575. arrive on the same circuit. This should make it more expensive for
  15576. attackers to overwhelm hidden services with introductions.
  15577. Resolves ticket 15515.
  15578. Changes in version 0.2.6.6 - 2015-03-24
  15579. Tor 0.2.6.6 is the first stable release in the 0.2.6 series.
  15580. It adds numerous safety, security, correctness, and performance
  15581. improvements. Client programs can be configured to use more kinds of
  15582. sockets, AutomapHosts works better, the multithreading backend is
  15583. improved, cell transmission is refactored, test coverage is much
  15584. higher, more denial-of-service attacks are handled, guard selection is
  15585. improved to handle long-term guards better, pluggable transports
  15586. should work a bit better, and some annoying hidden service performance
  15587. bugs should be addressed.
  15588. o New compiler and system requirements:
  15589. - Tor 0.2.6.x requires that your compiler support more of the C99
  15590. language standard than before. The 'configure' script now detects
  15591. whether your compiler supports C99 mid-block declarations and
  15592. designated initializers. If it does not, Tor will not compile.
  15593. We may revisit this requirement if it turns out that a significant
  15594. number of people need to build Tor with compilers that don't
  15595. bother implementing a 15-year-old standard. Closes ticket 13233.
  15596. - Tor no longer supports systems without threading support. When we
  15597. began working on Tor, there were several systems that didn't have
  15598. threads, or where the thread support wasn't able to run the
  15599. threads of a single process on multiple CPUs. That no longer
  15600. holds: every system where Tor needs to run well now has threading
  15601. support. Resolves ticket 12439.
  15602. o Deprecated versions and removed support:
  15603. - Tor relays older than 0.2.4.18-rc are no longer allowed to
  15604. advertise themselves on the network. Closes ticket 13555.
  15605. - Tor clients no longer support connecting to hidden services
  15606. running on Tor 0.2.2.x and earlier; the Support022HiddenServices
  15607. option has been removed. (There shouldn't be any hidden services
  15608. running these versions on the network.) Closes ticket 7803.
  15609. o Directory authority changes:
  15610. - The directory authority Faravahar has a new IP address. This
  15611. closes ticket 14487.
  15612. - Remove turtles as a directory authority.
  15613. - Add longclaw as a new (v3) directory authority. This implements
  15614. ticket 13296. This keeps the directory authority count at 9.
  15615. o Major features (bridges):
  15616. - Expose the outgoing upstream HTTP/SOCKS proxy to pluggable
  15617. transports if they are configured via the "TOR_PT_PROXY"
  15618. environment variable. Implements proposal 232. Resolves
  15619. ticket 8402.
  15620. o Major features (changed defaults):
  15621. - Prevent relay operators from unintentionally running exits: When a
  15622. relay is configured as an exit node, we now warn the user unless
  15623. the "ExitRelay" option is set to 1. We warn even more loudly if
  15624. the relay is configured with the default exit policy, since this
  15625. can indicate accidental misconfiguration. Setting "ExitRelay 0"
  15626. stops Tor from running as an exit relay. Closes ticket 10067.
  15627. o Major features (client performance, hidden services):
  15628. - Allow clients to use optimistic data when connecting to a hidden
  15629. service, which should remove a round-trip from hidden service
  15630. initialization. See proposal 181 for details. Implements
  15631. ticket 13211.
  15632. o Major features (directory system):
  15633. - Upon receiving an unparseable directory object, if its digest
  15634. matches what we expected, then don't try to download it again.
  15635. Previously, when we got a descriptor we didn't like, we would keep
  15636. trying to download it over and over. Closes ticket 11243.
  15637. - When downloading server- or microdescriptors from a directory
  15638. server, we no longer launch multiple simultaneous requests to the
  15639. same server. This reduces load on the directory servers,
  15640. especially when directory guards are in use. Closes ticket 9969.
  15641. - When downloading server- or microdescriptors over a tunneled
  15642. connection, do not limit the length of our requests to what the
  15643. Squid proxy is willing to handle. Part of ticket 9969.
  15644. - Authorities can now vote on the correct digests and latest
  15645. versions for different software packages. This allows packages
  15646. that include Tor to use the Tor authority system as a way to get
  15647. notified of updates and their correct digests. Implements proposal
  15648. 227. Closes ticket 10395.
  15649. o Major features (guards):
  15650. - Introduce the Guardfraction feature to improves load balancing on
  15651. guard nodes. Specifically, it aims to reduce the traffic gap that
  15652. guard nodes experience when they first get the Guard flag. This is
  15653. a required step if we want to increase the guard lifetime to 9
  15654. months or greater. Closes ticket 9321.
  15655. o Major features (hidden services):
  15656. - Make HS port scanning more difficult by immediately closing the
  15657. circuit when a user attempts to connect to a nonexistent port.
  15658. Closes ticket 13667.
  15659. - Add a HiddenServiceStatistics option that allows Tor relays to
  15660. gather and publish statistics about the overall size and volume of
  15661. hidden service usage. Specifically, when this option is turned on,
  15662. an HSDir will publish an approximate number of hidden services
  15663. that have published descriptors to it the past 24 hours. Also, if
  15664. a relay has acted as a hidden service rendezvous point, it will
  15665. publish the approximate amount of rendezvous cells it has relayed
  15666. the past 24 hours. The statistics themselves are obfuscated so
  15667. that the exact values cannot be derived. For more details see
  15668. proposal 238, "Better hidden service stats from Tor relays". This
  15669. feature is currently disabled by default. Implements feature 13192.
  15670. o Major features (performance):
  15671. - Make the CPU worker implementation more efficient by avoiding the
  15672. kernel and lengthening pipelines. The original implementation used
  15673. sockets to transfer data from the main thread to the workers, and
  15674. didn't allow any thread to be assigned more than a single piece of
  15675. work at once. The new implementation avoids communications
  15676. overhead by making requests in shared memory, avoiding kernel IO
  15677. where possible, and keeping more requests in flight at once.
  15678. Implements ticket 9682.
  15679. o Major features (relay):
  15680. - Raise the minimum acceptable configured bandwidth rate for bridges
  15681. to 50 KiB/sec and for relays to 75 KiB/sec. (The old values were
  15682. 20 KiB/sec.) Closes ticket 13822.
  15683. - Complete revision of the code that relays use to decide which cell
  15684. to send next. Formerly, we selected the best circuit to write on
  15685. each channel, but we didn't select among channels in any
  15686. sophisticated way. Now, we choose the best circuits globally from
  15687. among those whose channels are ready to deliver traffic.
  15688. This patch implements a new inter-cmux comparison API, a global
  15689. high/low watermark mechanism and a global scheduler loop for
  15690. transmission prioritization across all channels as well as among
  15691. circuits on one channel. This schedule is currently tuned to
  15692. (tolerantly) avoid making changes in network performance, but it
  15693. should form the basis for major circuit performance increases in
  15694. the future. Code by Andrea; tuning by Rob Jansen; implements
  15695. ticket 9262.
  15696. o Major features (sample torrc):
  15697. - Add a new, infrequently-changed "torrc.minimal". This file is
  15698. similar to torrc.sample, but it will change as infrequently as
  15699. possible, for the benefit of users whose systems prompt them for
  15700. intervention whenever a default configuration file is changed.
  15701. Making this change allows us to update torrc.sample to be a more
  15702. generally useful "sample torrc".
  15703. o Major features (security, unix domain sockets):
  15704. - Allow SocksPort to be an AF_UNIX Unix Domain Socket. Now high risk
  15705. applications can reach Tor without having to create AF_INET or
  15706. AF_INET6 sockets, meaning they can completely disable their
  15707. ability to make non-Tor network connections. To create a socket of
  15708. this type, use "SocksPort unix:/path/to/socket". Implements
  15709. ticket 12585.
  15710. - Support mapping hidden service virtual ports to AF_UNIX sockets.
  15711. The syntax is "HiddenServicePort 80 unix:/path/to/socket".
  15712. Implements ticket 11485.
  15713. o Major bugfixes (client, automap):
  15714. - Repair automapping with IPv6 addresses. This automapping should
  15715. have worked previously, but one piece of debugging code that we
  15716. inserted to detect a regression actually caused the regression to
  15717. manifest itself again. Fixes bug 13811 and bug 12831; bugfix on
  15718. 0.2.4.7-alpha. Diagnosed and fixed by Francisco Blas
  15719. Izquierdo Riera.
  15720. o Major bugfixes (crash, OSX, security):
  15721. - Fix a remote denial-of-service opportunity caused by a bug in
  15722. OSX's _strlcat_chk() function. Fixes bug 15205; bug first appeared
  15723. in OSX 10.9.
  15724. o Major bugfixes (directory authorities):
  15725. - Do not assign the HSDir flag to relays if they are not Valid, or
  15726. currently hibernating. Fixes 12573; bugfix on 0.2.0.10-alpha.
  15727. o Major bugfixes (directory bandwidth performance):
  15728. - Don't flush the zlib buffer aggressively when compressing
  15729. directory information for clients. This should save about 7% of
  15730. the bandwidth currently used for compressed descriptors and
  15731. microdescriptors. Fixes bug 11787; bugfix on 0.1.1.23.
  15732. o Major bugfixes (exit node stability):
  15733. - Fix an assertion failure that could occur under high DNS load.
  15734. Fixes bug 14129; bugfix on Tor 0.0.7rc1. Found by "jowr";
  15735. diagnosed and fixed by "cypherpunks".
  15736. o Major bugfixes (FreeBSD IPFW transparent proxy):
  15737. - Fix address detection with FreeBSD transparent proxies, when
  15738. "TransProxyType ipfw" is in use. Fixes bug 15064; bugfix
  15739. on 0.2.5.4-alpha.
  15740. o Major bugfixes (hidden services):
  15741. - When closing an introduction circuit that was opened in parallel
  15742. with others, don't mark the introduction point as unreachable.
  15743. Previously, the first successful connection to an introduction
  15744. point would make the other introduction points get marked as
  15745. having timed out. Fixes bug 13698; bugfix on 0.0.6rc2.
  15746. o Major bugfixes (Linux seccomp2 sandbox):
  15747. - Upon receiving sighup with the seccomp2 sandbox enabled, do not
  15748. crash during attempts to call wait4. Fixes bug 15088; bugfix on
  15749. 0.2.5.1-alpha. Patch from "sanic".
  15750. o Major bugfixes (mixed relay-client operation):
  15751. - When running as a relay and client at the same time (not
  15752. recommended), if we decide not to use a new guard because we want
  15753. to retry older guards, only close the locally-originating circuits
  15754. passing through that guard. Previously we would close all the
  15755. circuits through that guard. Fixes bug 9819; bugfix on
  15756. 0.2.1.1-alpha. Reported by "skruffy".
  15757. o Major bugfixes (pluggable transports):
  15758. - Initialize the extended OR Port authentication cookie before
  15759. launching pluggable transports. This prevents a race condition
  15760. that occurred when server-side pluggable transports would cache the
  15761. authentication cookie before it has been (re)generated. Fixes bug
  15762. 15240; bugfix on 0.2.5.1-alpha.
  15763. o Major bugfixes (relay, stability, possible security):
  15764. - Fix a bug that could lead to a relay crashing with an assertion
  15765. failure if a buffer of exactly the wrong layout is passed to
  15766. buf_pullup() at exactly the wrong time. Fixes bug 15083; bugfix on
  15767. 0.2.0.10-alpha. Patch from "cypherpunks".
  15768. - Do not assert if the 'data' pointer on a buffer is advanced to the
  15769. very end of the buffer; log a BUG message instead. Only assert if
  15770. it is past that point. Fixes bug 15083; bugfix on 0.2.0.10-alpha.
  15771. o Minor features (build):
  15772. - New --disable-system-torrc compile-time option to prevent Tor from
  15773. looking for the system-wide torrc or torrc-defaults files.
  15774. Resolves ticket 13037.
  15775. o Minor features (client):
  15776. - Clients are now willing to send optimistic data (before they
  15777. receive a 'connected' cell) to relays of any version. (Relays
  15778. without support for optimistic data are no longer supported on the
  15779. Tor network.) Resolves ticket 13153.
  15780. o Minor features (client):
  15781. - Validate hostnames in SOCKS5 requests more strictly. If SafeSocks
  15782. is enabled, reject requests with IP addresses as hostnames.
  15783. Resolves ticket 13315.
  15784. o Minor features (controller):
  15785. - Add a "SIGNAL HEARTBEAT" controller command that tells Tor to
  15786. write an unscheduled heartbeat message to the log. Implements
  15787. feature 9503.
  15788. - Include SOCKS_USERNAME and SOCKS_PASSWORD values in controller
  15789. events so controllers can observe circuit isolation inputs. Closes
  15790. ticket 8405.
  15791. - ControlPort now supports the unix:/path/to/socket syntax as an
  15792. alternative to the ControlSocket option, for consistency with
  15793. SocksPort and HiddenServicePort. Closes ticket 14451.
  15794. - New "GETINFO bw-event-cache" to get information about recent
  15795. bandwidth events. Closes ticket 14128. Useful for controllers to
  15796. get recent bandwidth history after the fix for ticket 13988.
  15797. - Messages about problems in the bootstrap process now include
  15798. information about the server we were trying to connect to when we
  15799. noticed the problem. Closes ticket 15006.
  15800. o Minor features (Denial of service resistance):
  15801. - Count the total number of bytes used storing hidden service
  15802. descriptors against the value of MaxMemInQueues. If we're low on
  15803. memory, and more than 20% of our memory is used holding hidden
  15804. service descriptors, free them until no more than 10% of our
  15805. memory holds hidden service descriptors. Free the least recently
  15806. fetched descriptors first. Resolves ticket 13806.
  15807. - When we have recently been under memory pressure (over 3/4 of
  15808. MaxMemInQueues is allocated), then allocate smaller zlib objects
  15809. for small requests. Closes ticket 11791.
  15810. o Minor features (directory authorities):
  15811. - Don't list relays with a bandwidth estimate of 0 in the consensus.
  15812. Implements a feature proposed during discussion of bug 13000.
  15813. - In tor-gencert, report an error if the user provides the same
  15814. argument more than once.
  15815. - If a directory authority can't find a best consensus method in the
  15816. votes that it holds, it now falls back to its favorite consensus
  15817. method. Previously, it fell back to method 1. Neither of these is
  15818. likely to get enough signatures, but "fall back to favorite"
  15819. doesn't require us to maintain support an obsolete consensus
  15820. method. Implements part of proposal 215.
  15821. o Minor features (geoip):
  15822. - Update geoip to the March 3 2015 Maxmind GeoLite2 Country database.
  15823. - Update geoip6 to the March 3 2015 Maxmind GeoLite2
  15824. Country database.
  15825. o Minor features (guard nodes):
  15826. - Reduce the time delay before saving guard status to disk from 10
  15827. minutes to 30 seconds (or from one hour to 10 minutes if
  15828. AvoidDiskWrites is set). Closes ticket 12485.
  15829. o Minor features (heartbeat):
  15830. - On relays, report how many connections we negotiated using each
  15831. version of the Tor link protocols. This information will let us
  15832. know if removing support for very old versions of the Tor
  15833. protocols is harming the network. Closes ticket 15212.
  15834. o Minor features (hidden service):
  15835. - Make Sybil attacks against hidden services harder by changing the
  15836. minimum time required to get the HSDir flag from 25 hours up to 96
  15837. hours. Addresses ticket 14149.
  15838. - New option "HiddenServiceAllowUnknownPorts" to allow hidden
  15839. services to disable the anti-scanning feature introduced in
  15840. 0.2.6.2-alpha. With this option not set, a connection to an
  15841. unlisted port closes the circuit. With this option set, only a
  15842. RELAY_DONE cell is sent. Closes ticket 14084.
  15843. - When re-enabling the network, don't try to build introduction
  15844. circuits until we have successfully built a circuit. This makes
  15845. hidden services come up faster when the network is re-enabled.
  15846. Patch from "akwizgran". Closes ticket 13447.
  15847. - When we fail to retrieve a hidden service descriptor, send the
  15848. controller an "HS_DESC FAILED" controller event. Implements
  15849. feature 13212.
  15850. - New HiddenServiceDirGroupReadable option to cause hidden service
  15851. directories and hostname files to be created group-readable. Patch
  15852. from "anon", David Stainton, and "meejah". Closes ticket 11291.
  15853. o Minor features (interface):
  15854. - Implement "-f -" command-line option to read torrc configuration
  15855. from standard input, if you don't want to store the torrc file in
  15856. the file system. Implements feature 13865.
  15857. o Minor features (logging):
  15858. - Add a count of unique clients to the bridge heartbeat message.
  15859. Resolves ticket 6852.
  15860. - Suppress "router info incompatible with extra info" message when
  15861. reading extrainfo documents from cache. (This message got loud
  15862. around when we closed bug 9812 in 0.2.6.2-alpha.) Closes
  15863. ticket 13762.
  15864. - Elevate hidden service authorized-client message from DEBUG to
  15865. INFO. Closes ticket 14015.
  15866. - On Unix-like systems, you can now use named pipes as the target of
  15867. the Log option, and other options that try to append to files.
  15868. Closes ticket 12061. Patch from "carlo von lynX".
  15869. - When opening a log file at startup, send it every log message that
  15870. we generated between startup and opening it. Previously, log
  15871. messages that were generated before opening the log file were only
  15872. logged to stdout. Closes ticket 6938.
  15873. - Add a TruncateLogFile option to overwrite logs instead of
  15874. appending to them. Closes ticket 5583.
  15875. - Quiet some log messages in the heartbeat and at startup. Closes
  15876. ticket 14950.
  15877. o Minor features (portability, Solaris):
  15878. - Threads are no longer disabled by default on Solaris; we believe
  15879. that the versions of Solaris with broken threading support are all
  15880. obsolete by now. Resolves ticket 9495.
  15881. o Minor features (relay):
  15882. - Re-check our address after we detect a changed IP address from
  15883. getsockname(). This ensures that the controller command "GETINFO
  15884. address" will report the correct value. Resolves ticket 11582.
  15885. Patch from "ra".
  15886. - A new AccountingRule option lets Relays set whether they'd like
  15887. AccountingMax to be applied separately to inbound and outbound
  15888. traffic, or applied to the sum of inbound and outbound traffic.
  15889. Resolves ticket 961. Patch by "chobe".
  15890. - When identity keypair is generated for first time, log a
  15891. congratulatory message that links to the new relay lifecycle
  15892. document. Implements feature 10427.
  15893. o Minor features (security, memory wiping):
  15894. - Ensure we securely wipe keys from memory after
  15895. crypto_digest_get_digest and init_curve25519_keypair_from_file
  15896. have finished using them. Resolves ticket 13477.
  15897. o Minor features (security, out-of-memory handling):
  15898. - When handling an out-of-memory condition, allocate less memory for
  15899. temporary data structures. Fixes issue 10115.
  15900. - When handling an out-of-memory condition, consider more types of
  15901. buffers, including those on directory connections, and zlib
  15902. buffers. Resolves ticket 11792.
  15903. o Minor features (stability):
  15904. - Add assertions in our hash-table iteration code to check for
  15905. corrupted values that could cause infinite loops. Closes
  15906. ticket 11737.
  15907. o Minor features (systemd):
  15908. - Various improvements and modernizations in systemd hardening
  15909. support. Closes ticket 13805. Patch from Craig Andrews.
  15910. - Where supported, when running with systemd, report successful
  15911. startup to systemd. Part of ticket 11016. Patch by Michael Scherer.
  15912. - When running with systemd, support systemd watchdog messages. Part
  15913. of ticket 11016. Patch by Michael Scherer.
  15914. o Minor features (testing networks):
  15915. - Add the TestingDirAuthVoteExit option, which lists nodes to assign
  15916. the "Exit" flag regardless of their uptime, bandwidth, or exit
  15917. policy. TestingTorNetwork must be set for this option to have any
  15918. effect. Previously, authorities would take up to 35 minutes to
  15919. give nodes the Exit flag in a test network. Partially implements
  15920. ticket 13161.
  15921. - Drop the minimum RendPostPeriod on a testing network to 5 seconds,
  15922. and the default on a testing network to 2 minutes. Drop the
  15923. MIN_REND_INITIAL_POST_DELAY on a testing network to 5 seconds, but
  15924. keep the default on a testing network at 30 seconds. This reduces
  15925. HS bootstrap time to around 25 seconds. Also, change the default
  15926. time in test-network.sh to match. Closes ticket 13401. Patch
  15927. by "teor".
  15928. - Create TestingDirAuthVoteHSDir to correspond to
  15929. TestingDirAuthVoteExit/Guard. Ensures that authorities vote the
  15930. HSDir flag for the listed relays regardless of uptime or ORPort
  15931. connectivity. Respects the value of VoteOnHidServDirectoriesV2.
  15932. Partial implementation for ticket 14067. Patch by "teor".
  15933. o Minor features (tor2web mode):
  15934. - Introduce the config option Tor2webRendezvousPoints, which allows
  15935. clients in Tor2webMode to select a specific Rendezvous Point to be
  15936. used in HS circuits. This might allow better performance for
  15937. Tor2Web nodes. Implements ticket 12844.
  15938. o Minor features (transparent proxy):
  15939. - Update the transparent proxy option checks to allow for both ipfw
  15940. and pf on OS X. Closes ticket 14002.
  15941. - Use the correct option when using IPv6 with transparent proxy
  15942. support on Linux. Resolves 13808. Patch by Francisco Blas
  15943. Izquierdo Riera.
  15944. o Minor features (validation):
  15945. - Check all date/time values passed to tor_timegm and
  15946. parse_rfc1123_time for validity, taking leap years into account.
  15947. Improves HTTP header validation. Implemented with bug 13476.
  15948. - In correct_tm(), limit the range of values returned by system
  15949. localtime(_r) and gmtime(_r) to be between the years 1 and 8099.
  15950. This means we don't have to deal with negative or too large dates,
  15951. even if a clock is wrong. Otherwise we might fail to read a file
  15952. written by us which includes such a date. Fixes bug 13476.
  15953. - Stop allowing invalid address patterns like "*/24" that contain
  15954. both a wildcard address and a bit prefix length. This affects all
  15955. our address-range parsing code. Fixes bug 7484; bugfix
  15956. on 0.0.2pre14.
  15957. o Minor bugfixes (bridge clients):
  15958. - When configured to use a bridge without an identity digest (not
  15959. recommended), avoid launching an extra channel to it when
  15960. bootstrapping. Fixes bug 7733; bugfix on 0.2.4.4-alpha.
  15961. o Minor bugfixes (bridges):
  15962. - When DisableNetwork is set, do not launch pluggable transport
  15963. plugins, and if any are running, terminate them. Fixes bug 13213;
  15964. bugfix on 0.2.3.6-alpha.
  15965. o Minor bugfixes (C correctness):
  15966. - Fix several instances of possible integer overflow/underflow/NaN.
  15967. Fixes bug 13104; bugfix on 0.2.3.1-alpha and later. Patches
  15968. from "teor".
  15969. - In circuit_build_times_calculate_timeout() in circuitstats.c,
  15970. avoid dividing by zero in the pareto calculations. This traps
  15971. under clang's "undefined-trap" sanitizer. Fixes bug 13290; bugfix
  15972. on 0.2.2.2-alpha.
  15973. - Fix an integer overflow in format_time_interval(). Fixes bug
  15974. 13393; bugfix on 0.2.0.10-alpha.
  15975. - Set the correct day of year value when the system's localtime(_r)
  15976. or gmtime(_r) functions fail to set struct tm. Not externally
  15977. visible. Fixes bug 13476; bugfix on 0.0.2pre14.
  15978. - Avoid unlikely signed integer overflow in tor_timegm on systems
  15979. with 32-bit time_t. Fixes bug 13476; bugfix on 0.0.2pre14.
  15980. o Minor bugfixes (certificate handling):
  15981. - If an authority operator accidentally makes a signing certificate
  15982. with a future publication time, do not discard its real signing
  15983. certificates. Fixes bug 11457; bugfix on 0.2.0.3-alpha.
  15984. - Remove any old authority certificates that have been superseded
  15985. for at least two days. Previously, we would keep superseded
  15986. certificates until they expired, if they were published close in
  15987. time to the certificate that superseded them. Fixes bug 11454;
  15988. bugfix on 0.2.1.8-alpha.
  15989. o Minor bugfixes (client):
  15990. - Fix smartlist_choose_node_by_bandwidth() so that relays with the
  15991. BadExit flag are not considered worthy candidates. Fixes bug
  15992. 13066; bugfix on 0.1.2.3-alpha.
  15993. - Use the consensus schedule for downloading consensuses, and not
  15994. the generic schedule. Fixes bug 11679; bugfix on 0.2.2.6-alpha.
  15995. - Handle unsupported or malformed SOCKS5 requests properly by
  15996. responding with the appropriate error message before closing the
  15997. connection. Fixes bugs 12971 and 13314; bugfix on 0.0.2pre13.
  15998. o Minor bugfixes (client, automapping):
  15999. - Avoid crashing on torrc lines for VirtualAddrNetworkIPv[4|6] when
  16000. no value follows the option. Fixes bug 14142; bugfix on
  16001. 0.2.4.7-alpha. Patch by "teor".
  16002. - Fix a memory leak when using AutomapHostsOnResolve. Fixes bug
  16003. 14195; bugfix on 0.1.0.1-rc.
  16004. - Prevent changes to other options from removing the wildcard value
  16005. "." from "AutomapHostsSuffixes". Fixes bug 12509; bugfix
  16006. on 0.2.0.1-alpha.
  16007. - Allow MapAddress and AutomapHostsOnResolve to work together when
  16008. an address is mapped into another address type (like .onion) that
  16009. must be automapped at resolve time. Fixes bug 7555; bugfix
  16010. on 0.2.0.1-alpha.
  16011. o Minor bugfixes (client, bridges):
  16012. - When we are using bridges and we had a network connectivity
  16013. problem, only retry connecting to our currently configured
  16014. bridges, not all bridges we know about and remember using. Fixes
  16015. bug 14216; bugfix on 0.2.2.17-alpha.
  16016. o Minor bugfixes (client, DNS):
  16017. - Report the correct cached DNS expiration times on SOCKS port or in
  16018. DNS replies. Previously, we would report everything as "never
  16019. expires." Fixes bug 14193; bugfix on 0.2.3.17-beta.
  16020. - Avoid a small memory leak when we find a cached answer for a
  16021. reverse DNS lookup in a client-side DNS cache. (Remember, client-
  16022. side DNS caching is off by default, and is not recommended.) Fixes
  16023. bug 14259; bugfix on 0.2.0.1-alpha.
  16024. o Minor bugfixes (client, IPv6):
  16025. - Reject socks requests to literal IPv6 addresses when IPv6Traffic
  16026. flag is not set; and not because the NoIPv4Traffic flag was set.
  16027. Previously we'd looked at the NoIPv4Traffic flag for both types of
  16028. literal addresses. Fixes bug 14280; bugfix on 0.2.4.7-alpha.
  16029. o Minor bugfixes (client, microdescriptors):
  16030. - Use a full 256 bits of the SHA256 digest of a microdescriptor when
  16031. computing which microdescriptors to download. This keeps us from
  16032. erroneous download behavior if two microdescriptor digests ever
  16033. have the same first 160 bits. Fixes part of bug 13399; bugfix
  16034. on 0.2.3.1-alpha.
  16035. - Reset a router's status if its microdescriptor digest changes,
  16036. even if the first 160 bits remain the same. Fixes part of bug
  16037. 13399; bugfix on 0.2.3.1-alpha.
  16038. o Minor bugfixes (client, torrc):
  16039. - Stop modifying the value of our DirReqStatistics torrc option just
  16040. because we're not a bridge or relay. This bug was causing Tor
  16041. Browser users to write "DirReqStatistics 0" in their torrc files
  16042. as if they had chosen to change the config. Fixes bug 4244; bugfix
  16043. on 0.2.3.1-alpha.
  16044. - When GeoIPExcludeUnknown is enabled, do not incorrectly decide
  16045. that our options have changed every time we SIGHUP. Fixes bug
  16046. 9801; bugfix on 0.2.4.10-alpha. Patch from "qwerty1".
  16047. o Minor bugfixes (compilation):
  16048. - Fix a compilation warning on s390. Fixes bug 14988; bugfix
  16049. on 0.2.5.2-alpha.
  16050. - Silence clang warnings under --enable-expensive-hardening,
  16051. including implicit truncation of 64 bit values to 32 bit, const
  16052. char assignment to self, tautological compare, and additional
  16053. parentheses around equality tests. Fixes bug 13577; bugfix
  16054. on 0.2.5.4-alpha.
  16055. - Fix a clang warning about checking whether an address in the
  16056. middle of a structure is NULL. Fixes bug 14001; bugfix
  16057. on 0.2.1.2-alpha.
  16058. - The address of an array in the middle of a structure will always
  16059. be non-NULL. clang recognises this and complains. Disable the
  16060. tautologous and redundant check to silence this warning. Fixes bug
  16061. 14001; bugfix on 0.2.1.2-alpha.
  16062. - Compile correctly with (unreleased) OpenSSL 1.1.0 headers.
  16063. Addresses ticket 14188.
  16064. - Build without warnings with the stock OpenSSL srtp.h header, which
  16065. has a duplicate declaration of SSL_get_selected_srtp_profile().
  16066. Fixes bug 14220; this is OpenSSL's bug, not ours.
  16067. - Do not compile any code related to Tor2Web mode when Tor2Web mode
  16068. is not enabled at compile time. Previously, this code was included
  16069. in a disabled state. See discussion on ticket 12844.
  16070. - Allow our configure script to build correctly with autoconf 2.62
  16071. again. Fixes bug 12693; bugfix on 0.2.5.2-alpha.
  16072. - Improve the error message from ./configure to make it clear that
  16073. when asciidoc has not been found, the user will have to either add
  16074. --disable-asciidoc argument or install asciidoc. Resolves
  16075. ticket 13228.
  16076. o Minor bugfixes (controller):
  16077. - Report "down" in response to the "GETINFO entry-guards" command
  16078. when relays are down with an unreachable_since value. Previously,
  16079. we would report "up". Fixes bug 14184; bugfix on 0.1.2.2-alpha.
  16080. - Avoid crashing on a malformed EXTENDCIRCUIT command. Fixes bug
  16081. 14116; bugfix on 0.2.2.9-alpha.
  16082. o Minor bugfixes (controller):
  16083. - Return an error when the second or later arguments of the
  16084. "setevents" controller command are invalid events. Previously we
  16085. would return success while silently skipping invalid events. Fixes
  16086. bug 13205; bugfix on 0.2.3.2-alpha. Reported by "fpxnns".
  16087. o Minor bugfixes (directory authority):
  16088. - Allow directory authorities to fetch more data from one another if
  16089. they find themselves missing lots of votes. Previously, they had
  16090. been bumping against the 10 MB queued data limit. Fixes bug 14261;
  16091. bugfix on 0.1.2.5-alpha.
  16092. - Do not attempt to download extrainfo documents which we will be
  16093. unable to validate with a matching server descriptor. Fixes bug
  16094. 13762; bugfix on 0.2.0.1-alpha.
  16095. - Fix a bug that was truncating AUTHDIR_NEWDESC events sent to the
  16096. control port. Fixes bug 14953; bugfix on 0.2.0.1-alpha.
  16097. - Enlarge the buffer to read bwauth generated files to avoid an
  16098. issue when parsing the file in dirserv_read_measured_bandwidths().
  16099. Fixes bug 14125; bugfix on 0.2.2.1-alpha.
  16100. - When running as a v3 directory authority, advertise that you serve
  16101. extra-info documents so that clients who want them can find them
  16102. from you too. Fixes part of bug 11683; bugfix on 0.2.0.1-alpha.
  16103. o Minor bugfixes (directory system):
  16104. - Always believe that v3 directory authorities serve extra-info
  16105. documents, whether they advertise "caches-extra-info" or not.
  16106. Fixes part of bug 11683; bugfix on 0.2.0.1-alpha.
  16107. - Check the BRIDGE_DIRINFO flag bitwise rather than using equality.
  16108. Previously, directories offering BRIDGE_DIRINFO and some other
  16109. flag (i.e. microdescriptors or extrainfo) would be ignored when
  16110. looking for bridges. Partially fixes bug 13163; bugfix
  16111. on 0.2.0.7-alpha.
  16112. o Minor bugfixes (file handling):
  16113. - Stop failing when key files are zero-length. Instead, generate new
  16114. keys, and overwrite the empty key files. Fixes bug 13111; bugfix
  16115. on all versions of Tor. Patch by "teor".
  16116. - Stop generating a fresh .old RSA onion key file when the .old file
  16117. is missing. Fixes part of 13111; bugfix on 0.0.6rc1.
  16118. - Avoid overwriting .old key files with empty key files.
  16119. - Skip loading zero-length extrainfo store, router store, stats,
  16120. state, and key files.
  16121. - Avoid crashing when trying to reload a torrc specified as a
  16122. relative path with RunAsDaemon turned on. Fixes bug 13397; bugfix
  16123. on 0.2.3.11-alpha.
  16124. o Minor bugfixes (hidden services):
  16125. - Close the introduction circuit when we have no more usable intro
  16126. points, instead of waiting for it to time out. This also ensures
  16127. that no follow-up HS descriptor fetch is triggered when the
  16128. circuit eventually times out. Fixes bug 14224; bugfix on 0.0.6.
  16129. - When fetching a hidden service descriptor for a down service that
  16130. was recently up, do not keep refetching until we try the same
  16131. replica twice in a row. Fixes bug 14219; bugfix on 0.2.0.10-alpha.
  16132. - Correctly send a controller event when we find that a rendezvous
  16133. circuit has finished. Fixes bug 13936; bugfix on 0.1.1.5-alpha.
  16134. - Pre-check directory permissions for new hidden-services to avoid
  16135. at least one case of "Bug: Acting on config options left us in a
  16136. broken state. Dying." Fixes bug 13942; bugfix on 0.0.6pre1.
  16137. - When fetching hidden service descriptors, we now check not only
  16138. for whether we got the hidden service we had in mind, but also
  16139. whether we got the particular descriptors we wanted. This prevents
  16140. a class of inefficient but annoying DoS attacks by hidden service
  16141. directories. Fixes bug 13214; bugfix on 0.2.1.6-alpha. Reported
  16142. by "special".
  16143. o Minor bugfixes (Linux seccomp2 sandbox):
  16144. - Make transparent proxy support work along with the seccomp2
  16145. sandbox. Fixes part of bug 13808; bugfix on 0.2.5.1-alpha. Patch
  16146. by Francisco Blas Izquierdo Riera.
  16147. - Fix a memory leak in tor-resolve when running with the sandbox
  16148. enabled. Fixes bug 14050; bugfix on 0.2.5.9-rc.
  16149. - Allow glibc fatal errors to be sent to stderr before Tor exits.
  16150. Previously, glibc would try to write them to /dev/tty, and the
  16151. sandbox would trap the call and make Tor exit prematurely. Fixes
  16152. bug 14759; bugfix on 0.2.5.1-alpha.
  16153. o Minor bugfixes (logging):
  16154. - Avoid crashing when there are more log domains than entries in
  16155. domain_list. Bugfix on 0.2.3.1-alpha.
  16156. - Downgrade warnings about RSA signature failures to info log level.
  16157. Emit a warning when an extra info document is found incompatible
  16158. with a corresponding router descriptor. Fixes bug 9812; bugfix
  16159. on 0.0.6rc3.
  16160. - Make connection_ap_handshake_attach_circuit() log the circuit ID
  16161. correctly. Fixes bug 13701; bugfix on 0.0.6.
  16162. o Minor bugfixes (networking):
  16163. - Check for orconns and use connection_or_close_for_error() rather
  16164. than connection_mark_for_close() directly in the getsockopt()
  16165. failure case of connection_handle_write_impl(). Fixes bug 11302;
  16166. bugfix on 0.2.4.4-alpha.
  16167. o Minor bugfixes (parsing):
  16168. - Stop accepting milliseconds (or other junk) at the end of
  16169. descriptor publication times. Fixes bug 9286; bugfix on 0.0.2pre25.
  16170. - Support two-number and three-number version numbers correctly, in
  16171. case we change the Tor versioning system in the future. Fixes bug
  16172. 13661; bugfix on 0.0.8pre1.
  16173. o Minor bugfixes (portability):
  16174. - Fix the ioctl()-based network interface lookup code so that it
  16175. will work on systems that have variable-length struct ifreq, for
  16176. example Mac OS X.
  16177. - Use the correct datatype in the SipHash-2-4 function to prevent
  16178. compilers from assuming any sort of alignment. Fixes bug 15436;
  16179. bugfix on 0.2.5.3-alpha.
  16180. o Minor bugfixes (preventative security, C safety):
  16181. - When reading a hexadecimal, base-32, or base-64 encoded value from
  16182. a string, always overwrite the whole output buffer. This prevents
  16183. some bugs where we would look at (but fortunately, not reveal)
  16184. uninitialized memory on the stack. Fixes bug 14013; bugfix on all
  16185. versions of Tor.
  16186. - Clear all memory targeted by tor_addr_{to,from}_sockaddr(), not
  16187. just the part that's used. This makes it harder for data leak bugs
  16188. to occur in the event of other programming failures. Resolves
  16189. ticket 14041.
  16190. o Minor bugfixes (relay):
  16191. - When generating our family list, remove spaces from around the
  16192. entries. Fixes bug 12728; bugfix on 0.2.1.7-alpha.
  16193. - If our previous bandwidth estimate was 0 bytes, allow publishing a
  16194. new relay descriptor immediately. Fixes bug 13000; bugfix
  16195. on 0.1.1.6-alpha.
  16196. o Minor bugfixes (shutdown):
  16197. - When shutting down, always call event_del() on lingering read or
  16198. write events before freeing them. Otherwise, we risk double-frees
  16199. or read-after-frees in event_base_free(). Fixes bug 12985; bugfix
  16200. on 0.1.0.2-rc.
  16201. o Minor bugfixes (small memory leaks):
  16202. - Avoid leaking memory when using IPv6 virtual address mappings.
  16203. Fixes bug 14123; bugfix on 0.2.4.7-alpha. Patch by Tom van
  16204. der Woerdt.
  16205. o Minor bugfixes (statistics):
  16206. - Increase period over which bandwidth observations are aggregated
  16207. from 15 minutes to 4 hours. Fixes bug 13988; bugfix on 0.0.8pre1.
  16208. o Minor bugfixes (systemd support):
  16209. - Run correctly under systemd with the RunAsDaemon option set. Fixes
  16210. part of bug 14141; bugfix on 0.2.5.7-rc. Patch from Tomasz Torcz.
  16211. - Inform the systemd supervisor about more changes in the Tor
  16212. process status. Implements part of ticket 14141. Patch from
  16213. Tomasz Torcz.
  16214. o Minor bugfixes (testing networks):
  16215. - Fix TestingDirAuthVoteGuard to properly give out Guard flags in a
  16216. testing network. Fixes bug 13064; bugfix on 0.2.5.2-alpha.
  16217. - Stop using the default authorities in networks which provide both
  16218. AlternateDirAuthority and AlternateBridgeAuthority. Partially
  16219. fixes bug 13163; bugfix on 0.2.0.13-alpha.
  16220. o Minor bugfixes (testing networks, fast startup):
  16221. - Allow Tor to build circuits using a consensus with no exits. If
  16222. the consensus has no exits (typical of a bootstrapping test
  16223. network), allow Tor to build circuits once enough descriptors have
  16224. been downloaded. This assists in bootstrapping a testing Tor
  16225. network. Fixes bug 13718; bugfix on 0.2.4.10-alpha. Patch
  16226. by "teor".
  16227. - When V3AuthVotingInterval is low, give a lower If-Modified-Since
  16228. header to directory servers. This allows us to obtain consensuses
  16229. promptly when the consensus interval is very short. This assists
  16230. in bootstrapping a testing Tor network. Fixes parts of bugs 13718
  16231. and 13963; bugfix on 0.2.0.3-alpha. Patch by "teor".
  16232. - Stop assuming that private addresses are local when checking
  16233. reachability in a TestingTorNetwork. Instead, when testing, assume
  16234. all OR connections are remote. (This is necessary due to many test
  16235. scenarios running all relays on localhost.) This assists in
  16236. bootstrapping a testing Tor network. Fixes bug 13924; bugfix on
  16237. 0.1.0.1-rc. Patch by "teor".
  16238. - Avoid building exit circuits from a consensus with no exits. Now
  16239. thanks to our fix for 13718, we accept a no-exit network as not
  16240. wholly lost, but we need to remember not to try to build exit
  16241. circuits on it. Closes ticket 13814; patch by "teor".
  16242. - Stop requiring exits to have non-zero bandwithcapacity in a
  16243. TestingTorNetwork. Instead, when TestingMinExitFlagThreshold is 0,
  16244. ignore exit bandwidthcapacity. This assists in bootstrapping a
  16245. testing Tor network. Fixes parts of bugs 13718 and 13839; bugfix
  16246. on 0.2.0.3-alpha. Patch by "teor".
  16247. - Add "internal" to some bootstrap statuses when no exits are
  16248. available. If the consensus does not contain Exits, Tor will only
  16249. build internal circuits. In this case, relevant statuses will
  16250. contain the word "internal" as indicated in the Tor control-
  16251. spec.txt. When bootstrap completes, Tor will be ready to build
  16252. internal circuits. If a future consensus contains Exits, exit
  16253. circuits may become available. Fixes part of bug 13718; bugfix on
  16254. 0.2.4.10-alpha. Patch by "teor".
  16255. - Decrease minimum consensus interval to 10 seconds when
  16256. TestingTorNetwork is set, or 5 seconds for the first consensus.
  16257. Fix assumptions throughout the code that assume larger intervals.
  16258. Fixes bugs 13718 and 13823; bugfix on 0.2.0.3-alpha. Patch
  16259. by "teor".
  16260. - Avoid excluding guards from path building in minimal test
  16261. networks, when we're in a test network and excluding guards would
  16262. exclude all relays. This typically occurs in incredibly small tor
  16263. networks, and those using "TestingAuthVoteGuard *". Fixes part of
  16264. bug 13718; bugfix on 0.1.1.11-alpha. Patch by "teor".
  16265. o Minor bugfixes (testing):
  16266. - Avoid a side-effect in a tor_assert() in the unit tests. Fixes bug
  16267. 15188; bugfix on 0.1.2.3-alpha. Patch from Tom van der Woerdt.
  16268. - Stop spawn test failures due to a race condition between the
  16269. SIGCHLD handler updating the process status, and the test reading
  16270. it. Fixes bug 13291; bugfix on 0.2.3.3-alpha.
  16271. - Avoid passing an extra backslash when creating a temporary
  16272. directory for running the unit tests on Windows. Fixes bug 12392;
  16273. bugfix on 0.2.2.25-alpha. Patch from Gisle Vanem.
  16274. o Minor bugfixes (TLS):
  16275. - Check more thoroughly throughout the TLS code for possible
  16276. unlogged TLS errors. Possible diagnostic or fix for bug 13319.
  16277. o Minor bugfixes (transparent proxy):
  16278. - Use getsockname, not getsockopt, to retrieve the address for a
  16279. TPROXY-redirected connection. Fixes bug 13796; bugfix
  16280. on 0.2.5.2-alpha.
  16281. o Minor bugfixes (windows):
  16282. - Remove code to special-case handling of NTE_BAD_KEYSET when
  16283. acquiring windows CryptoAPI context. This error can't actually
  16284. occur for the parameters we're providing. Fixes bug 10816; bugfix
  16285. on 0.0.2pre26.
  16286. o Minor bugfixes (zlib):
  16287. - Avoid truncating a zlib stream when trying to finalize it with an
  16288. empty output buffer. Fixes bug 11824; bugfix on 0.1.1.23.
  16289. o Code simplification and refactoring:
  16290. - Change the entry_is_live() function to take named bitfield
  16291. elements instead of an unnamed list of booleans. Closes
  16292. ticket 12202.
  16293. - Refactor and unit-test entry_is_time_to_retry() in entrynodes.c.
  16294. Resolves ticket 12205.
  16295. - Use calloc and reallocarray functions instead of multiply-
  16296. then-malloc. This makes it less likely for us to fall victim to an
  16297. integer overflow attack when allocating. Resolves ticket 12855.
  16298. - Use the standard macro name SIZE_MAX, instead of our
  16299. own SIZE_T_MAX.
  16300. - Document usage of the NO_DIRINFO and ALL_DIRINFO flags clearly in
  16301. functions which take them as arguments. Replace 0 with NO_DIRINFO
  16302. in a function call for clarity. Seeks to prevent future issues
  16303. like 13163.
  16304. - Avoid 4 null pointer errors under clang static analysis by using
  16305. tor_assert() to prove that the pointers aren't null. Fixes
  16306. bug 13284.
  16307. - Rework the API of policies_parse_exit_policy() to use a bitmask to
  16308. represent parsing options, instead of a confusing mess of
  16309. booleans. Resolves ticket 8197.
  16310. - Introduce a helper function to parse ExitPolicy in
  16311. or_options_t structure.
  16312. - Move fields related to isolating and configuring client ports into
  16313. a shared structure. Previously, they were duplicated across
  16314. port_cfg_t, listener_connection_t, and edge_connection_t. Failure
  16315. to copy them correctly had been the cause of at least one bug in
  16316. the past. Closes ticket 8546.
  16317. - Refactor the get_interface_addresses_raw() doom-function into
  16318. multiple smaller and simpler subfunctions. Cover the resulting
  16319. subfunctions with unit-tests. Fixes a significant portion of
  16320. issue 12376.
  16321. - Remove workaround in dirserv_thinks_router_is_hs_dir() that was
  16322. only for version <= 0.2.2.24 which is now deprecated. Closes
  16323. ticket 14202.
  16324. - Remove a test for a long-defunct broken version-one
  16325. directory server.
  16326. - Refactor main loop to extract the 'loop' part. This makes it
  16327. easier to run Tor under Shadow. Closes ticket 15176.
  16328. - Stop using can_complete_circuits as a global variable; access it
  16329. with a function instead.
  16330. - Avoid using operators directly as macro arguments: this lets us
  16331. apply coccinelle transformations to our codebase more directly.
  16332. Closes ticket 13172.
  16333. - Combine the functions used to parse ClientTransportPlugin and
  16334. ServerTransportPlugin into a single function. Closes ticket 6456.
  16335. - Add inline functions and convenience macros for inspecting channel
  16336. state. Refactor the code to use convenience macros instead of
  16337. checking channel state directly. Fixes issue 7356.
  16338. - Document all members of was_router_added_t and rename
  16339. ROUTER_WAS_NOT_NEW to ROUTER_IS_ALREADY_KNOWN to make it less
  16340. confusable with ROUTER_WAS_TOO_OLD. Fixes issue 13644.
  16341. - In connection_exit_begin_conn(), use END_CIRC_REASON_TORPROTOCOL
  16342. constant instead of hardcoded value. Fixes issue 13840.
  16343. - Refactor our generic strmap and digestmap types into a single
  16344. implementation, so that we can add a new digest256map
  16345. type trivially.
  16346. o Documentation:
  16347. - Add a doc/TUNING document with tips for handling large numbers of
  16348. TCP connections when running busy Tor relay. Update the warning
  16349. message to point to this file when running out of sockets
  16350. operating system is allowing to use simultaneously. Resolves
  16351. ticket 9708.
  16352. - Adding section on OpenBSD to our TUNING document. Thanks to mmcc
  16353. for writing the OpenBSD-specific tips. Resolves ticket 13702.
  16354. - Make the tor-resolve documentation match its help string and its
  16355. options. Resolves part of ticket 14325.
  16356. - Log a more useful error message from tor-resolve when failing to
  16357. look up a hidden service address. Resolves part of ticket 14325.
  16358. - Document the bridge-authority-only 'networkstatus-bridges' file.
  16359. Closes ticket 13713; patch from "tom".
  16360. - Fix typo in PredictedPortsRelevanceTime option description in
  16361. manpage. Resolves issue 13707.
  16362. - Stop suggesting that users specify relays by nickname: it isn't a
  16363. good idea. Also, properly cross-reference how to specify relays in
  16364. all parts of manual documenting options that take a list of
  16365. relays. Closes ticket 13381.
  16366. - Clarify the HiddenServiceDir option description in manpage to make
  16367. it clear that relative paths are taken with respect to the current
  16368. working directory. Also clarify that this behavior is not
  16369. guaranteed to remain indefinitely. Fixes issue 13913.
  16370. o Distribution (systemd):
  16371. - systemd unit file: only allow tor to write to /var/lib/tor and
  16372. /var/log/tor. The rest of the filesystem is accessible for reading
  16373. only. Patch by intrigeri; resolves ticket 12751.
  16374. - systemd unit file: ensure that the process and all its children
  16375. can never gain new privileges. Patch by intrigeri; resolves
  16376. ticket 12939.
  16377. - systemd unit file: set up /var/run/tor as writable for the Tor
  16378. service. Patch by intrigeri; resolves ticket 13196.
  16379. o Downgraded warnings:
  16380. - Don't warn when we've attempted to contact a relay using the wrong
  16381. ntor onion key. Closes ticket 9635.
  16382. o Removed code:
  16383. - Remove some lingering dead code that once supported mempools.
  16384. Mempools were disabled by default in 0.2.5, and removed entirely
  16385. in 0.2.6.3-alpha. Closes more of ticket 14848; patch
  16386. by "cypherpunks".
  16387. o Removed features (directory authorities):
  16388. - Remove code that prevented authorities from listing Tor relays
  16389. affected by CVE-2011-2769 as guards. These relays are already
  16390. rejected altogether due to the minimum version requirement of
  16391. 0.2.3.16-alpha. Closes ticket 13152.
  16392. - The "AuthDirRejectUnlisted" option no longer has any effect, as
  16393. the fingerprints file (approved-routers) has been deprecated.
  16394. - Directory authorities do not support being Naming dirauths anymore.
  16395. The "NamingAuthoritativeDir" config option is now obsolete.
  16396. - Directory authorities do not support giving out the BadDirectory
  16397. flag anymore.
  16398. - Directory authorities no longer advertise or support consensus
  16399. methods 1 through 12 inclusive. These consensus methods were
  16400. obsolete and/or insecure: maintaining the ability to support them
  16401. served no good purpose. Implements part of proposal 215; closes
  16402. ticket 10163.
  16403. o Removed features:
  16404. - To avoid confusion with the "ExitRelay" option, "ExitNode" is no
  16405. longer silently accepted as an alias for "ExitNodes".
  16406. - The --enable-mempool and --enable-buf-freelists options, which
  16407. were originally created to work around bad malloc implementations,
  16408. no longer exist. They were off-by-default in 0.2.5. Closes
  16409. ticket 14848.
  16410. - We no longer remind the user about configuration options that have
  16411. been obsolete since 0.2.3.x or earlier. Patch by Adrien Bak.
  16412. - Remove our old, non-weighted bandwidth-based node selection code.
  16413. Previously, we used it as a fallback when we couldn't perform
  16414. weighted bandwidth-based node selection. But that would only
  16415. happen in the cases where we had no consensus, or when we had a
  16416. consensus generated by buggy or ancient directory authorities. In
  16417. either case, it's better to use the more modern, better maintained
  16418. algorithm, with reasonable defaults for the weights. Closes
  16419. ticket 13126.
  16420. - Remove the --disable-curve25519 configure option. Relays and
  16421. clients now are required to support curve25519 and the
  16422. ntor handshake.
  16423. - The old "StrictEntryNodes" and "StrictExitNodes" options, which
  16424. used to be deprecated synonyms for "StrictNodes", are now marked
  16425. obsolete. Resolves ticket 12226.
  16426. - Clients don't understand the BadDirectory flag in the consensus
  16427. anymore, and ignore it.
  16428. o Removed platform support:
  16429. - We no longer include special code to build on Windows CE; as far
  16430. as we know, nobody has used Tor on Windows CE in a very long time.
  16431. Closes ticket 11446.
  16432. o Testing (test-network.sh):
  16433. - Stop using "echo -n", as some shells' built-in echo doesn't
  16434. support "-n". Instead, use "/bin/echo -n". Partially fixes
  16435. bug 13161.
  16436. - Stop an apparent test-network hang when used with make -j2. Fixes
  16437. bug 13331.
  16438. - Add a --delay option to test-network.sh, which configures the
  16439. delay before the chutney network tests for data transmission.
  16440. Partially implements ticket 13161.
  16441. o Testing:
  16442. - Test that tor does not fail when key files are zero-length. Check
  16443. that tor generates new keys, and overwrites the empty key files.
  16444. - Test that tor generates new keys when keys are missing
  16445. (existing behavior).
  16446. - Test that tor does not overwrite key files that already contain
  16447. data (existing behavior). Tests bug 13111. Patch by "teor".
  16448. - New "make test-stem" target to run stem integration tests.
  16449. Requires that the "STEM_SOURCE_DIR" environment variable be set.
  16450. Closes ticket 14107.
  16451. - Make the test_cmdline_args.py script work correctly on Windows.
  16452. Patch from Gisle Vanem.
  16453. - Move the slower unit tests into a new "./src/test/test-slow"
  16454. binary that can be run independently of the other tests. Closes
  16455. ticket 13243.
  16456. - New tests for many parts of channel, relay, and circuitmux
  16457. functionality. Code by Andrea; part of 9262.
  16458. - New tests for parse_transport_line(). Part of ticket 6456.
  16459. - In the unit tests, use chgrp() to change the group of the unit
  16460. test temporary directory to the current user, so that the sticky
  16461. bit doesn't interfere with tests that check directory groups.
  16462. Closes 13678.
  16463. - Add unit tests for resolve_my_addr(). Part of ticket 12376; patch
  16464. by 'rl1987'.
  16465. - Refactor the function that chooses guard nodes so that it can more
  16466. easily be tested; write some tests for it.
  16467. - Fix and re-enable the fgets_eagain unit test. Fixes bug 12503;
  16468. bugfix on 0.2.3.1-alpha. Patch from "cypherpunks."
  16469. - Create unit tests for format_time_interval(). With bug 13393.
  16470. - Add unit tests for tor_timegm signed overflow, tor_timegm and
  16471. parse_rfc1123_time validity checks, correct_tm year clamping. Unit
  16472. tests (visible) fixes in bug 13476.
  16473. - Add a "coverage-html" make target to generate HTML-visualized
  16474. coverage results when building with --enable-coverage. (Requires
  16475. lcov.) Patch from Kevin Murray.
  16476. - Enable the backtrace handler (where supported) when running the
  16477. unit tests.
  16478. - Revise all unit tests that used the legacy test_* macros to
  16479. instead use the recommended tt_* macros. This patch was generated
  16480. with coccinelle, to avoid manual errors. Closes ticket 13119.
  16481. Changes in version 0.2.5.11 - 2015-03-17
  16482. Tor 0.2.5.11 is the second stable release in the 0.2.5 series.
  16483. It backports several bugfixes from the 0.2.6 branch, including a
  16484. couple of medium-level security fixes for relays and exit nodes.
  16485. It also updates the list of directory authorities.
  16486. o Directory authority changes:
  16487. - Remove turtles as a directory authority.
  16488. - Add longclaw as a new (v3) directory authority. This implements
  16489. ticket 13296. This keeps the directory authority count at 9.
  16490. - The directory authority Faravahar has a new IP address. This
  16491. closes ticket 14487.
  16492. o Major bugfixes (crash, OSX, security):
  16493. - Fix a remote denial-of-service opportunity caused by a bug in
  16494. OSX's _strlcat_chk() function. Fixes bug 15205; bug first appeared
  16495. in OSX 10.9.
  16496. o Major bugfixes (relay, stability, possible security):
  16497. - Fix a bug that could lead to a relay crashing with an assertion
  16498. failure if a buffer of exactly the wrong layout was passed to
  16499. buf_pullup() at exactly the wrong time. Fixes bug 15083; bugfix on
  16500. 0.2.0.10-alpha. Patch from 'cypherpunks'.
  16501. - Do not assert if the 'data' pointer on a buffer is advanced to the
  16502. very end of the buffer; log a BUG message instead. Only assert if
  16503. it is past that point. Fixes bug 15083; bugfix on 0.2.0.10-alpha.
  16504. o Major bugfixes (exit node stability):
  16505. - Fix an assertion failure that could occur under high DNS load.
  16506. Fixes bug 14129; bugfix on Tor 0.0.7rc1. Found by "jowr";
  16507. diagnosed and fixed by "cypherpunks".
  16508. o Major bugfixes (Linux seccomp2 sandbox):
  16509. - Upon receiving sighup with the seccomp2 sandbox enabled, do not
  16510. crash during attempts to call wait4. Fixes bug 15088; bugfix on
  16511. 0.2.5.1-alpha. Patch from "sanic".
  16512. o Minor features (controller):
  16513. - New "GETINFO bw-event-cache" to get information about recent
  16514. bandwidth events. Closes ticket 14128. Useful for controllers to
  16515. get recent bandwidth history after the fix for ticket 13988.
  16516. o Minor features (geoip):
  16517. - Update geoip to the March 3 2015 Maxmind GeoLite2 Country database.
  16518. - Update geoip6 to the March 3 2015 Maxmind GeoLite2
  16519. Country database.
  16520. o Minor bugfixes (client, automapping):
  16521. - Avoid crashing on torrc lines for VirtualAddrNetworkIPv[4|6] when
  16522. no value follows the option. Fixes bug 14142; bugfix on
  16523. 0.2.4.7-alpha. Patch by "teor".
  16524. - Fix a memory leak when using AutomapHostsOnResolve. Fixes bug
  16525. 14195; bugfix on 0.1.0.1-rc.
  16526. o Minor bugfixes (compilation):
  16527. - Build without warnings with the stock OpenSSL srtp.h header, which
  16528. has a duplicate declaration of SSL_get_selected_srtp_profile().
  16529. Fixes bug 14220; this is OpenSSL's bug, not ours.
  16530. o Minor bugfixes (directory authority):
  16531. - Allow directory authorities to fetch more data from one another if
  16532. they find themselves missing lots of votes. Previously, they had
  16533. been bumping against the 10 MB queued data limit. Fixes bug 14261;
  16534. bugfix on 0.1.2.5-alpha.
  16535. - Enlarge the buffer to read bwauth generated files to avoid an
  16536. issue when parsing the file in dirserv_read_measured_bandwidths().
  16537. Fixes bug 14125; bugfix on 0.2.2.1-alpha.
  16538. o Minor bugfixes (statistics):
  16539. - Increase period over which bandwidth observations are aggregated
  16540. from 15 minutes to 4 hours. Fixes bug 13988; bugfix on 0.0.8pre1.
  16541. o Minor bugfixes (preventative security, C safety):
  16542. - When reading a hexadecimal, base-32, or base-64 encoded value from
  16543. a string, always overwrite the whole output buffer. This prevents
  16544. some bugs where we would look at (but fortunately, not reveal)
  16545. uninitialized memory on the stack. Fixes bug 14013; bugfix on all
  16546. versions of Tor.
  16547. Changes in version 0.2.4.26 - 2015-03-17
  16548. Tor 0.2.4.26 includes an updated list of directory authorities. It
  16549. also backports a couple of stability and security bugfixes from 0.2.5
  16550. and beyond.
  16551. o Directory authority changes:
  16552. - Remove turtles as a directory authority.
  16553. - Add longclaw as a new (v3) directory authority. This implements
  16554. ticket 13296. This keeps the directory authority count at 9.
  16555. - The directory authority Faravahar has a new IP address. This
  16556. closes ticket 14487.
  16557. o Major bugfixes (exit node stability, also in 0.2.6.3-alpha):
  16558. - Fix an assertion failure that could occur under high DNS load.
  16559. Fixes bug 14129; bugfix on Tor 0.0.7rc1. Found by "jowr";
  16560. diagnosed and fixed by "cypherpunks".
  16561. o Major bugfixes (relay, stability, possible security, also in 0.2.6.4-rc):
  16562. - Fix a bug that could lead to a relay crashing with an assertion
  16563. failure if a buffer of exactly the wrong layout was passed to
  16564. buf_pullup() at exactly the wrong time. Fixes bug 15083; bugfix on
  16565. 0.2.0.10-alpha. Patch from 'cypherpunks'.
  16566. - Do not assert if the 'data' pointer on a buffer is advanced to the
  16567. very end of the buffer; log a BUG message instead. Only assert if
  16568. it is past that point. Fixes bug 15083; bugfix on 0.2.0.10-alpha.
  16569. o Minor features (geoip):
  16570. - Update geoip to the March 3 2015 Maxmind GeoLite2 Country database.
  16571. - Update geoip6 to the March 3 2015 Maxmind GeoLite2
  16572. Country database.
  16573. Changes in version 0.2.5.10 - 2014-10-24
  16574. Tor 0.2.5.10 is the first stable release in the 0.2.5 series.
  16575. It adds several new security features, including improved
  16576. denial-of-service resistance for relays, new compiler hardening
  16577. options, and a system-call sandbox for hardened installations on Linux
  16578. (requires seccomp2). The controller protocol has several new features,
  16579. resolving IPv6 addresses should work better than before, and relays
  16580. should be a little more CPU-efficient. We've added support for more
  16581. OpenBSD and FreeBSD transparent proxy types. We've improved the build
  16582. system and testing infrastructure to allow unit testing of more parts
  16583. of the Tor codebase. Finally, we've addressed several nagging pluggable
  16584. transport usability issues, and included numerous other small bugfixes
  16585. and features mentioned below.
  16586. This release marks end-of-life for Tor 0.2.3.x; those Tor versions
  16587. have accumulated many known flaws; everyone should upgrade.
  16588. o Major features (security):
  16589. - The ntor handshake is now on-by-default, no matter what the
  16590. directory authorities recommend. Implements ticket 8561.
  16591. - Make the "tor-gencert" tool used by directory authority operators
  16592. create 2048-bit signing keys by default (rather than 1024-bit, since
  16593. 1024-bit is uncomfortably small these days). Addresses ticket 10324.
  16594. - Warn about attempts to run hidden services and relays in the same
  16595. process: that's probably not a good idea. Closes ticket 12908.
  16596. - Disable support for SSLv3. All versions of OpenSSL in use with Tor
  16597. today support TLS 1.0 or later, so we can safely turn off support
  16598. for this old (and insecure) protocol. Fixes bug 13426.
  16599. o Major features (relay security, DoS-resistance):
  16600. - When deciding whether we have run out of memory and we need to
  16601. close circuits, also consider memory allocated in buffers for
  16602. streams attached to each circuit.
  16603. This change, which extends an anti-DoS feature introduced in
  16604. 0.2.4.13-alpha and improved in 0.2.4.14-alpha, lets Tor exit relays
  16605. better resist more memory-based DoS attacks than before. Since the
  16606. MaxMemInCellQueues option now applies to all queues, it is renamed
  16607. to MaxMemInQueues. This feature fixes bug 10169.
  16608. - Avoid hash-flooding denial-of-service attacks by using the secure
  16609. SipHash-2-4 hash function for our hashtables. Without this
  16610. feature, an attacker could degrade performance of a targeted
  16611. client or server by flooding their data structures with a large
  16612. number of entries to be stored at the same hash table position,
  16613. thereby slowing down the Tor instance. With this feature, hash
  16614. table positions are derived from a randomized cryptographic key,
  16615. and an attacker cannot predict which entries will collide. Closes
  16616. ticket 4900.
  16617. - If you don't specify MaxMemInQueues yourself, Tor now tries to
  16618. pick a good value based on your total system memory. Previously,
  16619. the default was always 8 GB. You can still override the default by
  16620. setting MaxMemInQueues yourself. Resolves ticket 11396.
  16621. o Major features (bridges and pluggable transports):
  16622. - Add support for passing arguments to managed pluggable transport
  16623. proxies. Implements ticket 3594.
  16624. - Bridges now track GeoIP information and the number of their users
  16625. even when pluggable transports are in use, and report usage
  16626. statistics in their extra-info descriptors. Resolves tickets 4773
  16627. and 5040.
  16628. - Don't launch pluggable transport proxies if we don't have any
  16629. bridges configured that would use them. Now we can list many
  16630. pluggable transports, and Tor will dynamically start one when it
  16631. hears a bridge address that needs it. Resolves ticket 5018.
  16632. - The bridge directory authority now assigns status flags (Stable,
  16633. Guard, etc) to bridges based on thresholds calculated over all
  16634. Running bridges. Now bridgedb can finally make use of its features
  16635. to e.g. include at least one Stable bridge in its answers. Fixes
  16636. bug 9859.
  16637. o Major features (controller):
  16638. - Extend ORCONN controller event to include an "ID" parameter,
  16639. and add four new controller event types CONN_BW, CIRC_BW,
  16640. CELL_STATS, and TB_EMPTY that show connection and circuit usage.
  16641. The new events are emitted in private Tor networks only, with the
  16642. goal of being able to better track performance and load during
  16643. full-network simulations. Implements proposal 218 and ticket 7359.
  16644. o Major features (relay performance):
  16645. - Speed up server-side lookups of rendezvous and introduction point
  16646. circuits by using hashtables instead of linear searches. These
  16647. functions previously accounted between 3 and 7% of CPU usage on
  16648. some busy relays. Resolves ticket 9841.
  16649. - Avoid wasting CPU when extending a circuit over a channel that is
  16650. nearly out of circuit IDs. Previously, we would do a linear scan
  16651. over possible circuit IDs before finding one or deciding that we
  16652. had exhausted our possibilities. Now, we try at most 64 random
  16653. circuit IDs before deciding that we probably won't succeed. Fixes
  16654. a possible root cause of ticket 11553.
  16655. o Major features (seccomp2 sandbox, Linux only):
  16656. - Use the seccomp2 syscall filtering facility on Linux to limit
  16657. which system calls Tor can invoke. This is an experimental,
  16658. Linux-only feature to provide defense-in-depth against unknown
  16659. attacks. To try turning it on, set "Sandbox 1" in your torrc
  16660. file. Please be ready to report bugs. We hope to add support
  16661. for better sandboxing in the future, including more fine-grained
  16662. filters, better division of responsibility, and support for more
  16663. platforms. This work has been done by Cristian-Matei Toader for
  16664. Google Summer of Code. Resolves tickets 11351 and 11465.
  16665. o Major features (testing networks):
  16666. - Make testing Tor networks bootstrap better: lower directory fetch
  16667. retry schedules and maximum interval without directory requests,
  16668. and raise maximum download tries. Implements ticket 6752.
  16669. - Add make target 'test-network' to run tests on a Chutney network.
  16670. Implements ticket 8530.
  16671. o Major features (other):
  16672. - On some platforms (currently: recent OSX versions, glibc-based
  16673. platforms that support the ELF format, and a few other
  16674. Unix-like operating systems), Tor can now dump stack traces
  16675. when a crash occurs or an assertion fails. By default, traces
  16676. are dumped to stderr (if possible) and to any logs that are
  16677. reporting errors. Implements ticket 9299.
  16678. o Deprecated versions:
  16679. - Tor 0.2.3.x has reached end-of-life; it has received no patches or
  16680. attention for some while.
  16681. o Major bugfixes (security, directory authorities):
  16682. - Directory authorities now include a digest of each relay's
  16683. identity key as a part of its microdescriptor.
  16684. This is a workaround for bug 11743 (reported by "cypherpunks"),
  16685. where Tor clients do not support receiving multiple
  16686. microdescriptors with the same SHA256 digest in the same
  16687. consensus. When clients receive a consensus like this, they only
  16688. use one of the relays. Without this fix, a hostile relay could
  16689. selectively disable some client use of target relays by
  16690. constructing a router descriptor with a different identity and the
  16691. same microdescriptor parameters and getting the authorities to
  16692. list it in a microdescriptor consensus. This fix prevents an
  16693. attacker from causing a microdescriptor collision, because the
  16694. router's identity is not forgeable.
  16695. o Major bugfixes (openssl bug workaround):
  16696. - Avoid crashing when using OpenSSL version 0.9.8zc, 1.0.0o, or
  16697. 1.0.1j, built with the 'no-ssl3' configuration option. Fixes
  16698. bug 13471. This is a workaround for an OpenSSL bug.
  16699. o Major bugfixes (client):
  16700. - Perform circuit cleanup operations even when circuit
  16701. construction operations are disabled (because the network is
  16702. disabled, or because there isn't enough directory information).
  16703. Previously, when we were not building predictive circuits, we
  16704. were not closing expired circuits either. Fixes bug 8387; bugfix on
  16705. 0.1.1.11-alpha. This bug became visible in 0.2.4.10-alpha when we
  16706. became more strict about when we have "enough directory information
  16707. to build circuits".
  16708. o Major bugfixes (client, pluggable transports):
  16709. - When managing pluggable transports, use OS notification facilities
  16710. to learn if they have crashed, and don't attempt to kill any
  16711. process that has already exited. Fixes bug 8746; bugfix
  16712. on 0.2.3.6-alpha.
  16713. o Major bugfixes (relay denial of service):
  16714. - Instead of writing destroy cells directly to outgoing connection
  16715. buffers, queue them and intersperse them with other outgoing cells.
  16716. This can prevent a set of resource starvation conditions where too
  16717. many pending destroy cells prevent data cells from actually getting
  16718. delivered. Reported by "oftc_must_be_destroyed". Fixes bug 7912;
  16719. bugfix on 0.2.0.1-alpha.
  16720. o Major bugfixes (relay):
  16721. - Avoid queuing or sending destroy cells for circuit ID zero when we
  16722. fail to send a CREATE cell. Fixes bug 12848; bugfix on 0.0.8pre1.
  16723. Found and fixed by "cypherpunks".
  16724. - Fix ORPort reachability detection on relays running behind a
  16725. proxy, by correctly updating the "local" mark on the controlling
  16726. channel when changing the address of an or_connection_t after the
  16727. handshake. Fixes bug 12160; bugfix on 0.2.4.4-alpha.
  16728. - Use a direct dirport connection when uploading non-anonymous
  16729. descriptors to the directory authorities. Previously, relays would
  16730. incorrectly use tunnel connections under a fairly wide variety of
  16731. circumstances. Fixes bug 11469; bugfix on 0.2.4.3-alpha.
  16732. - When a circuit accidentally has the same circuit ID for its
  16733. forward and reverse direction, correctly detect the direction of
  16734. cells using that circuit. Previously, this bug made roughly one
  16735. circuit in a million non-functional. Fixes bug 12195; this is a
  16736. bugfix on every version of Tor.
  16737. o Minor features (security):
  16738. - New --enable-expensive-hardening option to enable security
  16739. hardening options that consume nontrivial amounts of CPU and
  16740. memory. Right now, this includes AddressSanitizer and UbSan, which
  16741. are supported in newer versions of GCC and Clang. Closes ticket
  16742. 11477.
  16743. - Authorities now assign the Guard flag to the fastest 25% of the
  16744. network (it used to be the fastest 50%). Also raise the consensus
  16745. weight that guarantees the Guard flag from 250 to 2000. For the
  16746. current network, this results in about 1100 guards, down from 2500.
  16747. This step paves the way for moving the number of entry guards
  16748. down to 1 (proposal 236) while still providing reasonable expected
  16749. performance for most users. Implements ticket 12690.
  16750. o Minor features (security, memory management):
  16751. - Memory allocation tricks (mempools and buffer freelists) are now
  16752. disabled by default. You can turn them back on with
  16753. --enable-mempools and --enable-buf-freelists respectively. We're
  16754. disabling these features because malloc performance is good enough
  16755. on most platforms, and a similar feature in OpenSSL exacerbated
  16756. exploitation of the Heartbleed attack. Resolves ticket 11476.
  16757. o Minor features (bridge client):
  16758. - Report a more useful failure message when we can't connect to a
  16759. bridge because we don't have the right pluggable transport
  16760. configured. Resolves ticket 9665. Patch from Fábio J. Bertinatto.
  16761. o Minor features (bridge):
  16762. - Add an ExtORPortCookieAuthFileGroupReadable option to make the
  16763. cookie file for the ExtORPort g+r by default.
  16764. o Minor features (bridges, pluggable transports):
  16765. - Bridges now write the SHA1 digest of their identity key
  16766. fingerprint (that is, a hash of a hash of their public key) to
  16767. notice-level logs, and to a new hashed-fingerprint file. This
  16768. information will help bridge operators look up their bridge in
  16769. Globe and similar tools. Resolves ticket 10884.
  16770. - Improve the message that Tor displays when running as a bridge
  16771. using pluggable transports without an Extended ORPort listener.
  16772. Also, log the message in the log file too. Resolves ticket 11043.
  16773. - Add threshold cutoffs to the networkstatus document created by
  16774. the Bridge Authority. Fixes bug 1117.
  16775. - On Windows, spawn background processes using the CREATE_NO_WINDOW
  16776. flag. Now Tor Browser Bundle 3.5 with pluggable transports enabled
  16777. doesn't pop up a blank console window. (In Tor Browser Bundle 2.x,
  16778. Vidalia set this option for us.) Implements ticket 10297.
  16779. o Minor features (build):
  16780. - The configure script has a --disable-seccomp option to turn off
  16781. support for libseccomp on systems that have it, in case it (or
  16782. Tor's use of it) is broken. Resolves ticket 11628.
  16783. - Assume that a user using ./configure --host wants to cross-compile,
  16784. and give an error if we cannot find a properly named
  16785. tool-chain. Add a --disable-tool-name-check option to proceed
  16786. nevertheless. Addresses ticket 9869. Patch by Benedikt Gollatz.
  16787. - If we run ./configure and the compiler recognizes -fstack-protector
  16788. but the linker rejects it, warn the user about a potentially missing
  16789. libssp package. Addresses ticket 9948. Patch from Benedikt Gollatz.
  16790. - Add support for `--library-versions` flag. Implements ticket 6384.
  16791. - Return the "unexpected sendme" warnings to a warn severity, but make
  16792. them rate limited, to help diagnose ticket 8093.
  16793. - Detect a missing asciidoc, and warn the user about it, during
  16794. configure rather than at build time. Fixes issue 6506. Patch from
  16795. Arlo Breault.
  16796. o Minor features (client):
  16797. - Add a new option, PredictedPortsRelevanceTime, to control how long
  16798. after having received a request to connect to a given port Tor
  16799. will try to keep circuits ready in anticipation of future requests
  16800. for that port. Patch from "unixninja92"; implements ticket 9176.
  16801. o Minor features (config options and command line):
  16802. - Add an --allow-missing-torrc commandline option that tells Tor to
  16803. run even if the configuration file specified by -f is not available.
  16804. Implements ticket 10060.
  16805. - Add support for the TPROXY transparent proxying facility on Linux.
  16806. See documentation for the new TransProxyType option for more
  16807. details. Implementation by "thomo". Closes ticket 10582.
  16808. o Minor features (config options):
  16809. - Config (torrc) lines now handle fingerprints which are missing
  16810. their initial '$'. Resolves ticket 4341; improvement over 0.0.9pre5.
  16811. - Support a --dump-config option to print some or all of the
  16812. configured options. Mainly useful for debugging the command-line
  16813. option parsing code. Helps resolve ticket 4647.
  16814. - Raise awareness of safer logging: notify user of potentially
  16815. unsafe config options, like logging more verbosely than severity
  16816. "notice" or setting SafeLogging to 0. Resolves ticket 5584.
  16817. - Add a new configuration option TestingV3AuthVotingStartOffset
  16818. that bootstraps a network faster by changing the timing for
  16819. consensus votes. Addresses ticket 8532.
  16820. - Add a new torrc option "ServerTransportOptions" that allows
  16821. bridge operators to pass configuration parameters to their
  16822. pluggable transports. Resolves ticket 8929.
  16823. - The config (torrc) file now accepts bandwidth and space limits in
  16824. bits as well as bytes. (Anywhere that you can say "2 Kilobytes",
  16825. you can now say "16 kilobits", and so on.) Resolves ticket 9214.
  16826. Patch by CharlieB.
  16827. o Minor features (controller):
  16828. - Make the entire exit policy available from the control port via
  16829. GETINFO exit-policy/*. Implements enhancement 7952. Patch from
  16830. "rl1987".
  16831. - Because of the fix for ticket 11396, the real limit for memory
  16832. usage may no longer match the configured MaxMemInQueues value. The
  16833. real limit is now exposed via GETINFO limits/max-mem-in-queues.
  16834. - Add a new "HS_DESC" controller event that reports activities
  16835. related to hidden service descriptors. Resolves ticket 8510.
  16836. - New "DROPGUARDS" controller command to forget all current entry
  16837. guards. Not recommended for ordinary use, since replacing guards
  16838. too frequently makes several attacks easier. Resolves ticket 9934;
  16839. patch from "ra".
  16840. - Implement the TRANSPORT_LAUNCHED control port event that
  16841. notifies controllers about new launched pluggable
  16842. transports. Resolves ticket 5609.
  16843. o Minor features (diagnostic):
  16844. - When logging a warning because of bug 7164, additionally check the
  16845. hash table for consistency (as proposed on ticket 11737). This may
  16846. help diagnose bug 7164.
  16847. - When we log a heartbeat, log how many one-hop circuits we have
  16848. that are at least 30 minutes old, and log status information about
  16849. a few of them. This is an attempt to track down bug 8387.
  16850. - When encountering an unexpected CR while writing text to a file on
  16851. Windows, log the name of the file. Should help diagnosing
  16852. bug 11233.
  16853. - Give more specific warnings when a client notices that an onion
  16854. handshake has failed. Fixes ticket 9635.
  16855. - Add significant new logging code to attempt to diagnose bug 12184,
  16856. where relays seem to run out of available circuit IDs.
  16857. - Improve the diagnostic log message for bug 8387 even further to
  16858. try to improve our odds of figuring out why one-hop directory
  16859. circuits sometimes do not get closed.
  16860. - Add more log messages to diagnose bug 7164, which causes
  16861. intermittent "microdesc_free() called but md was still referenced"
  16862. warnings. We now include more information, to figure out why we
  16863. might be cleaning a microdescriptor for being too old if it's
  16864. still referenced by a live node_t object.
  16865. - Log current accounting state (bytes sent and received + remaining
  16866. time for the current accounting period) in the relay's heartbeat
  16867. message. Implements ticket 5526; patch from Peter Retzlaff.
  16868. o Minor features (geoip):
  16869. - Update geoip and geoip6 to the August 7 2014 Maxmind GeoLite2
  16870. Country database.
  16871. o Minor features (interface):
  16872. - Generate a warning if any ports are listed in the SocksPolicy,
  16873. DirPolicy, AuthDirReject, AuthDirInvalid, AuthDirBadDir, or
  16874. AuthDirBadExit options. (These options only support address
  16875. ranges.) Fixes part of ticket 11108.
  16876. o Minor features (kernel API usage):
  16877. - Use the SOCK_NONBLOCK socket type, if supported, to open nonblocking
  16878. sockets in a single system call. Implements ticket 5129.
  16879. o Minor features (log messages):
  16880. - When ServerTransportPlugin is set on a bridge, Tor can write more
  16881. useful statistics about bridge use in its extrainfo descriptors,
  16882. but only if the Extended ORPort ("ExtORPort") is set too. Add a
  16883. log message to inform the user in this case. Resolves ticket 9651.
  16884. - When receiving a new controller connection, log the origin address.
  16885. Resolves ticket 9698; patch from "sigpipe".
  16886. - When logging OpenSSL engine status at startup, log the status of
  16887. more engines. Fixes ticket 10043; patch from Joshua Datko.
  16888. o Minor features (log verbosity):
  16889. - Demote the message that we give when a flushing connection times
  16890. out for too long from NOTICE to INFO. It was usually meaningless.
  16891. Resolves ticket 5286.
  16892. - Don't log so many notice-level bootstrapping messages at startup
  16893. about downloading descriptors. Previously, we'd log a notice
  16894. whenever we learned about more routers. Now, we only log a notice
  16895. at every 5% of progress. Fixes bug 9963.
  16896. - Warn less verbosely when receiving a malformed
  16897. ESTABLISH_RENDEZVOUS cell. Fixes ticket 11279.
  16898. o Minor features (performance):
  16899. - If we're using the pure-C 32-bit curve25519_donna implementation
  16900. of curve25519, build it with the -fomit-frame-pointer option to
  16901. make it go faster on register-starved hosts. This improves our
  16902. handshake performance by about 6% on i386 hosts without nacl.
  16903. Closes ticket 8109.
  16904. o Minor features (relay):
  16905. - If a circuit timed out for at least 3 minutes, check if we have a
  16906. new external IP address, and publish a new descriptor with the new
  16907. IP address if it changed. Resolves ticket 2454.
  16908. o Minor features (testing):
  16909. - If Python is installed, "make check" now runs extra tests beyond
  16910. the unit test scripts.
  16911. - When bootstrapping a test network, sometimes very few relays get
  16912. the Guard flag. Now a new option "TestingDirAuthVoteGuard" can
  16913. specify a set of relays which should be voted Guard regardless of
  16914. their uptime or bandwidth. Addresses ticket 9206.
  16915. o Minor features (transparent proxy, *BSD):
  16916. - Support FreeBSD's ipfw firewall interface for TransPort ports on
  16917. FreeBSD. To enable it, set "TransProxyType ipfw". Resolves ticket
  16918. 10267; patch from "yurivict".
  16919. - Support OpenBSD's divert-to rules with the pf firewall for
  16920. transparent proxy ports. To enable it, set "TransProxyType
  16921. pf-divert". This allows Tor to run a TransPort transparent proxy
  16922. port on OpenBSD 4.4 or later without root privileges. See the
  16923. pf.conf(5) manual page for information on configuring pf to use
  16924. divert-to rules. Closes ticket 10896; patch from Dana Koch.
  16925. o Minor bugfixes (bridge client):
  16926. - Stop accepting bridge lines containing hostnames. Doing so would
  16927. cause clients to perform DNS requests on the hostnames, which was
  16928. not sensible behavior. Fixes bug 10801; bugfix on 0.2.0.1-alpha.
  16929. o Minor bugfixes (bridges):
  16930. - Avoid potential crashes or bad behavior when launching a
  16931. server-side managed proxy with ORPort or ExtORPort temporarily
  16932. disabled. Fixes bug 9650; bugfix on 0.2.3.16-alpha.
  16933. - Fix a bug where the first connection works to a bridge that uses a
  16934. pluggable transport with client-side parameters, but we don't send
  16935. the client-side parameters on subsequent connections. (We don't
  16936. use any pluggable transports with client-side parameters yet,
  16937. but ScrambleSuit will soon become the first one.) Fixes bug 9162;
  16938. bugfix on 0.2.0.3-alpha. Based on a patch from "rl1987".
  16939. o Minor bugfixes (build, auxiliary programs):
  16940. - Stop preprocessing the "torify" script with autoconf, since
  16941. it no longer refers to LOCALSTATEDIR. Fixes bug 5505; patch
  16942. from Guilhem.
  16943. - The tor-fw-helper program now follows the standard convention and
  16944. exits with status code "0" on success. Fixes bug 9030; bugfix on
  16945. 0.2.3.1-alpha. Patch by Arlo Breault.
  16946. - Corrected ./configure advice for what openssl dev package you should
  16947. install on Debian. Fixes bug 9207; bugfix on 0.2.0.1-alpha.
  16948. o Minor bugfixes (client):
  16949. - Avoid "Tried to open a socket with DisableNetwork set" warnings
  16950. when starting a client with bridges configured and DisableNetwork
  16951. set. (Tor launcher starts Tor with DisableNetwork set the first
  16952. time it runs.) Fixes bug 10405; bugfix on 0.2.3.9-alpha.
  16953. - Improve the log message when we can't connect to a hidden service
  16954. because all of the hidden service directory nodes hosting its
  16955. descriptor are excluded. Improves on our fix for bug 10722, which
  16956. was a bugfix on 0.2.0.10-alpha.
  16957. - Raise a control port warning when we fail to connect to all of
  16958. our bridges. Previously, we didn't inform the controller, and
  16959. the bootstrap process would stall. Fixes bug 11069; bugfix on
  16960. 0.2.1.2-alpha.
  16961. - Exit immediately when a process-owning controller exits.
  16962. Previously, tor relays would wait for a little while after their
  16963. controller exited, as if they had gotten an INT signal -- but this
  16964. was problematic, since there was no feedback for the user. To do a
  16965. clean shutdown, controllers should send an INT signal and give Tor
  16966. a chance to clean up. Fixes bug 10449; bugfix on 0.2.2.28-beta.
  16967. - Stop attempting to connect to bridges before our pluggable
  16968. transports are configured (harmless but resulted in some erroneous
  16969. log messages). Fixes bug 11156; bugfix on 0.2.3.2-alpha.
  16970. - Fix connections to IPv6 addresses over SOCKS5. Previously, we were
  16971. generating incorrect SOCKS5 responses, and confusing client
  16972. applications. Fixes bug 10987; bugfix on 0.2.4.7-alpha.
  16973. o Minor bugfixes (client, DNSPort):
  16974. - When using DNSPort, try to respond to AAAA requests with AAAA
  16975. answers. Previously, we hadn't looked at the request type when
  16976. deciding which answer type to prefer. Fixes bug 10468; bugfix on
  16977. 0.2.4.7-alpha.
  16978. - When receiving a DNS query for an unsupported record type, reply
  16979. with no answer rather than with a NOTIMPL error. This behavior
  16980. isn't correct either, but it will break fewer client programs, we
  16981. hope. Fixes bug 10268; bugfix on 0.2.0.1-alpha. Original patch
  16982. from "epoch".
  16983. o Minor bugfixes (client, logging during bootstrap):
  16984. - Only report the first fatal bootstrap error on a given OR
  16985. connection. This stops us from telling the controller bogus error
  16986. messages like "DONE". Fixes bug 10431; bugfix on 0.2.1.1-alpha.
  16987. - Avoid generating spurious warnings when starting with
  16988. DisableNetwork enabled. Fixes bug 11200 and bug 10405; bugfix on
  16989. 0.2.3.9-alpha.
  16990. o Minor bugfixes (closing OR connections):
  16991. - If write_to_buf() in connection_write_to_buf_impl_() ever fails,
  16992. check if it's an or_connection_t and correctly call
  16993. connection_or_close_for_error() rather than
  16994. connection_mark_for_close() directly. Fixes bug 11304; bugfix on
  16995. 0.2.4.4-alpha.
  16996. - When closing all connections on setting DisableNetwork to 1, use
  16997. connection_or_close_normally() rather than closing OR connections
  16998. out from under the channel layer. Fixes bug 11306; bugfix on
  16999. 0.2.4.4-alpha.
  17000. o Minor bugfixes (code correctness):
  17001. - Previously we used two temporary files when writing descriptors to
  17002. disk; now we only use one. Fixes bug 1376.
  17003. - Remove an erroneous (but impossible and thus harmless) pointer
  17004. comparison that would have allowed compilers to skip a bounds
  17005. check in channeltls.c. Fixes bugs 10313 and 9980; bugfix on
  17006. 0.2.0.10-alpha. Noticed by Jared L Wong and David Fifield.
  17007. - Fix an always-true assertion in pluggable transports code so it
  17008. actually checks what it was trying to check. Fixes bug 10046;
  17009. bugfix on 0.2.3.9-alpha. Found by "dcb".
  17010. o Minor bugfixes (command line):
  17011. - Use a single command-line parser for parsing torrc options on the
  17012. command line and for finding special command-line options to avoid
  17013. inconsistent behavior for torrc option arguments that have the same
  17014. names as command-line options. Fixes bugs 4647 and 9578; bugfix on
  17015. 0.0.9pre5.
  17016. - No longer allow 'tor --hash-password' with no arguments. Fixes bug
  17017. 9573; bugfix on 0.0.9pre5.
  17018. o Minor bugfixes (compilation):
  17019. - Compile correctly with builds and forks of OpenSSL (such as
  17020. LibreSSL) that disable compression. Fixes bug 12602; bugfix on
  17021. 0.2.1.1-alpha. Patch from "dhill".
  17022. - Restore the ability to compile Tor with V2_HANDSHAKE_SERVER
  17023. turned off (that is, without support for v2 link handshakes). Fixes
  17024. bug 4677; bugfix on 0.2.3.2-alpha. Patch from "piet".
  17025. - In routerlist_assert_ok(), don't take the address of a
  17026. routerinfo's cache_info member unless that routerinfo is non-NULL.
  17027. Fixes bug 13096; bugfix on 0.1.1.9-alpha. Patch by "teor".
  17028. - Fix a large number of false positive warnings from the clang
  17029. analyzer static analysis tool. This should make real warnings
  17030. easier for clang analyzer to find. Patch from "teor". Closes
  17031. ticket 13036.
  17032. - Resolve GCC complaints on OpenBSD about discarding constness in
  17033. TO_{ORIGIN,OR}_CIRCUIT functions. Fixes part of bug 11633; bugfix
  17034. on 0.1.1.23. Patch from Dana Koch.
  17035. - Resolve clang complaints on OpenBSD with -Wshorten-64-to-32 due to
  17036. treatment of long and time_t as comparable types. Fixes part of
  17037. bug 11633. Patch from Dana Koch.
  17038. - When deciding whether to build the 64-bit curve25519
  17039. implementation, detect platforms where we can compile 128-bit
  17040. arithmetic but cannot link it. Fixes bug 11729; bugfix on
  17041. 0.2.4.8-alpha. Patch from "conradev".
  17042. - Fix compilation when DNS_CACHE_DEBUG is enabled. Fixes bug 11761;
  17043. bugfix on 0.2.3.13-alpha. Found by "cypherpunks".
  17044. - Fix compilation with dmalloc. Fixes bug 11605; bugfix
  17045. on 0.2.4.10-alpha.
  17046. - Build and run correctly on systems like OpenBSD-current that have
  17047. patched OpenSSL to remove get_cipher_by_char and/or its
  17048. implementations. Fixes issue 13325.
  17049. o Minor bugfixes (controller and command-line):
  17050. - If changing a config option via "setconf" fails in a recoverable
  17051. way, we used to nonetheless write our new control ports to the
  17052. file described by the "ControlPortWriteToFile" option. Now we only
  17053. write out that file if we successfully switch to the new config
  17054. option. Fixes bug 5605; bugfix on 0.2.2.26-beta. Patch from "Ryman".
  17055. o Minor bugfixes (directory server):
  17056. - No longer accept malformed http headers when parsing urls from
  17057. headers. Now we reply with Bad Request ("400"). Fixes bug 2767;
  17058. bugfix on 0.0.6pre1.
  17059. - When sending a compressed set of descriptors or microdescriptors,
  17060. make sure to finalize the zlib stream. Previously, we would write
  17061. all the compressed data, but if the last descriptor we wanted to
  17062. send was missing or too old, we would not mark the stream as
  17063. finished. This caused problems for decompression tools. Fixes bug
  17064. 11648; bugfix on 0.1.1.23.
  17065. o Minor bugfixes (hidden service):
  17066. - Only retry attempts to connect to a chosen rendezvous point 8
  17067. times, not 30. Fixes bug 4241; bugfix on 0.1.0.1-rc.
  17068. o Minor bugfixes (interface):
  17069. - Reject relative control socket paths and emit a warning. Previously,
  17070. single-component control socket paths would be rejected, but Tor
  17071. would not log why it could not validate the config. Fixes bug 9258;
  17072. bugfix on 0.2.3.16-alpha.
  17073. o Minor bugfixes (log messages):
  17074. - Fix a bug where clients using bridges would report themselves
  17075. as 50% bootstrapped even without a live consensus document.
  17076. Fixes bug 9922; bugfix on 0.2.1.1-alpha.
  17077. - Suppress a warning where, if there's only one directory authority
  17078. in the network, we would complain that votes and signatures cannot
  17079. be uploaded to other directory authorities. Fixes bug 10842;
  17080. bugfix on 0.2.2.26-beta.
  17081. - Report bootstrapping progress correctly when we're downloading
  17082. microdescriptors. We had updated our "do we have enough microdescs
  17083. to begin building circuits?" logic most recently in 0.2.4.10-alpha
  17084. (see bug 5956), but we left the bootstrap status event logic at
  17085. "how far through getting 1/4 of them are we?" Fixes bug 9958;
  17086. bugfix on 0.2.2.36, which is where they diverged (see bug 5343).
  17087. o Minor bugfixes (logging):
  17088. - Downgrade "Unexpected onionskin length after decryption" warning
  17089. to a protocol-warn, since there's nothing relay operators can do
  17090. about a client that sends them a malformed create cell. Resolves
  17091. bug 12996; bugfix on 0.0.6rc1.
  17092. - Log more specific warnings when we get an ESTABLISH_RENDEZVOUS
  17093. cell on a cannibalized or non-OR circuit. Resolves ticket 12997.
  17094. - When logging information about an EXTEND2 or EXTENDED2 cell, log
  17095. their names correctly. Fixes part of bug 12700; bugfix
  17096. on 0.2.4.8-alpha.
  17097. - When logging information about a relay cell whose command we don't
  17098. recognize, log its command as an integer. Fixes part of bug 12700;
  17099. bugfix on 0.2.1.10-alpha.
  17100. - Escape all strings from the directory connection before logging
  17101. them. Fixes bug 13071; bugfix on 0.1.1.15. Patch from "teor".
  17102. - Squelch a spurious LD_BUG message "No origin circuit for
  17103. successful SOCKS stream" in certain hidden service failure cases;
  17104. fixes bug 10616.
  17105. - Downgrade the severity of the 'unexpected sendme cell from client'
  17106. from 'warn' to 'protocol warning'. Closes ticket 8093.
  17107. o Minor bugfixes (misc code correctness):
  17108. - In munge_extrainfo_into_routerinfo(), check the return value of
  17109. memchr(). This would have been a serious issue if we ever passed
  17110. it a non-extrainfo. Fixes bug 8791; bugfix on 0.2.0.6-alpha. Patch
  17111. from Arlo Breault.
  17112. - On the chance that somebody manages to build Tor on a
  17113. platform where time_t is unsigned, correct the way that
  17114. microdesc_add_to_cache() handles negative time arguments.
  17115. Fixes bug 8042; bugfix on 0.2.3.1-alpha.
  17116. - Fix various instances of undefined behavior in channeltls.c,
  17117. tor_memmem(), and eventdns.c that would cause us to construct
  17118. pointers to memory outside an allocated object. (These invalid
  17119. pointers were not accessed, but C does not even allow them to
  17120. exist.) Fixes bug 10363; bugfixes on 0.1.1.1-alpha, 0.1.2.1-alpha,
  17121. 0.2.0.10-alpha, and 0.2.3.6-alpha. Reported by "bobnomnom".
  17122. - Use the AddressSanitizer and Ubsan sanitizers (in clang-3.4) to
  17123. fix some miscellaneous errors in our tests and codebase. Fixes bug
  17124. 11232. Bugfixes on versions back as far as 0.2.1.11-alpha.
  17125. - Always check return values for unlink, munmap, UnmapViewOfFile;
  17126. check strftime return values more often. In some cases all we can
  17127. do is report a warning, but this may help prevent deeper bugs from
  17128. going unnoticed. Closes ticket 8787; bugfixes on many, many tor
  17129. versions.
  17130. - Fix numerous warnings from the clang "scan-build" static analyzer.
  17131. Some of these are programming style issues; some of them are false
  17132. positives that indicated awkward code; some are undefined behavior
  17133. cases related to constructing (but not using) invalid pointers;
  17134. some are assumptions about API behavior; some are (harmlessly)
  17135. logging sizeof(ptr) bytes from a token when sizeof(*ptr) would be
  17136. correct; and one or two are genuine bugs that weren't reachable
  17137. from the rest of the program. Fixes bug 8793; bugfixes on many,
  17138. many tor versions.
  17139. o Minor bugfixes (node selection):
  17140. - If ExcludeNodes is set, consider non-excluded hidden service
  17141. directory servers before excluded ones. Do not consider excluded
  17142. hidden service directory servers at all if StrictNodes is
  17143. set. (Previously, we would sometimes decide to connect to those
  17144. servers, and then realize before we initiated a connection that
  17145. we had excluded them.) Fixes bug 10722; bugfix on 0.2.0.10-alpha.
  17146. Reported by "mr-4".
  17147. - If we set the ExitNodes option but it doesn't include any nodes
  17148. that have the Exit flag, we would choose not to bootstrap. Now we
  17149. bootstrap so long as ExitNodes includes nodes which can exit to
  17150. some port. Fixes bug 10543; bugfix on 0.2.4.10-alpha.
  17151. o Minor bugfixes (performance):
  17152. - Avoid a bug where every successful connection made us recompute
  17153. the flag telling us whether we have sufficient information to
  17154. build circuits. Previously, we would forget our cached value
  17155. whenever we successfully opened a channel (or marked a router as
  17156. running or not running for any other reason), regardless of
  17157. whether we had previously believed the router to be running. This
  17158. forced us to run an expensive update operation far too often.
  17159. Fixes bug 12170; bugfix on 0.1.2.1-alpha.
  17160. - Avoid using tor_memeq() for checking relay cell integrity. This
  17161. removes a possible performance bottleneck. Fixes part of bug
  17162. 12169; bugfix on 0.2.1.31.
  17163. o Minor bugfixes (platform-specific):
  17164. - When dumping a malformed directory object to disk, save it in
  17165. binary mode on Windows, not text mode. Fixes bug 11342; bugfix on
  17166. 0.2.2.1-alpha.
  17167. - Don't report failures from make_socket_reuseable() on incoming
  17168. sockets on OSX: this can happen when incoming connections close
  17169. early. Fixes bug 10081.
  17170. o Minor bugfixes (pluggable transports):
  17171. - Avoid another 60-second delay when starting Tor in a pluggable-
  17172. transport-using configuration when we already have cached
  17173. descriptors for our bridges. Fixes bug 11965; bugfix
  17174. on 0.2.3.6-alpha.
  17175. o Minor bugfixes (protocol correctness):
  17176. - When receiving a VERSIONS cell with an odd number of bytes, close
  17177. the connection immediately since the cell is malformed. Fixes bug
  17178. 10365; bugfix on 0.2.0.10-alpha. Spotted by "bobnomnom"; fix by
  17179. "rl1987".
  17180. o Minor bugfixes (relay, other):
  17181. - We now drop CREATE cells for already-existent circuit IDs and for
  17182. zero-valued circuit IDs, regardless of other factors that might
  17183. otherwise have called for DESTROY cells. Fixes bug 12191; bugfix
  17184. on 0.0.8pre1.
  17185. - When rejecting DATA cells for stream_id zero, still count them
  17186. against the circuit's deliver window so that we don't fail to send
  17187. a SENDME. Fixes bug 11246; bugfix on 0.2.4.10-alpha.
  17188. o Minor bugfixes (relay, threading):
  17189. - Check return code on spawn_func() in cpuworker code, so that we
  17190. don't think we've spawned a nonworking cpuworker and write junk to
  17191. it forever. Fix related to bug 4345; bugfix on all released Tor
  17192. versions. Found by "skruffy".
  17193. - Use a pthread_attr to make sure that spawn_func() cannot return an
  17194. error while at the same time launching a thread. Fix related to
  17195. bug 4345; bugfix on all released Tor versions. Reported
  17196. by "cypherpunks".
  17197. o Minor bugfixes (relays and bridges):
  17198. - Avoid crashing on a malformed resolv.conf file when running a
  17199. relay using Libevent 1. Fixes bug 8788; bugfix on 0.1.1.23.
  17200. - Non-exit relays no longer launch mock DNS requests to check for
  17201. DNS hijacking. This has been unnecessary since 0.2.1.7-alpha, when
  17202. non-exit relays stopped servicing DNS requests. Fixes bug 965;
  17203. bugfix on 0.2.1.7-alpha. Patch from Matt Pagan.
  17204. - Bridges now report complete directory request statistics. Related
  17205. to bug 5824; bugfix on 0.2.2.1-alpha.
  17206. - Bridges now never collect statistics that were designed for
  17207. relays. Fixes bug 5824; bugfix on 0.2.3.8-alpha.
  17208. o Minor bugfixes (testing):
  17209. - Fix all valgrind warnings produced by the unit tests. There were
  17210. over a thousand memory leak warnings previously, mostly produced
  17211. by forgetting to free things in the unit test code. Fixes bug
  17212. 11618, bugfixes on many versions of Tor.
  17213. o Minor bugfixes (tor-fw-helper):
  17214. - Give a correct log message when tor-fw-helper fails to launch.
  17215. (Previously, we would say something like "tor-fw-helper sent us a
  17216. string we could not parse".) Fixes bug 9781; bugfix
  17217. on 0.2.4.2-alpha.
  17218. o Minor bugfixes (trivial memory leaks):
  17219. - Fix a small memory leak when signing a directory object. Fixes bug
  17220. 11275; bugfix on 0.2.4.13-alpha.
  17221. - Resolve some memory leaks found by coverity in the unit tests, on
  17222. exit in tor-gencert, and on a failure to compute digests for our
  17223. own keys when generating a v3 networkstatus vote. These leaks
  17224. should never have affected anyone in practice.
  17225. o Code simplification and refactoring:
  17226. - Remove some old fallback code designed to keep Tor clients working
  17227. in a network with only two working relays. Elsewhere in the code we
  17228. have long since stopped supporting such networks, so there wasn't
  17229. much point in keeping it around. Addresses ticket 9926.
  17230. - Reject 0-length EXTEND2 cells more explicitly. Fixes bug 10536;
  17231. bugfix on 0.2.4.8-alpha. Reported by "cypherpunks".
  17232. - Extract the common duplicated code for creating a subdirectory
  17233. of the data directory and writing to a file in it. Fixes ticket
  17234. 4282; patch from Peter Retzlaff.
  17235. - Since OpenSSL 0.9.7, the i2d_*() functions support allocating output
  17236. buffer. Avoid calling twice: i2d_RSAPublicKey(), i2d_DHparams(),
  17237. i2d_X509(), and i2d_PublicKey(). Resolves ticket 5170.
  17238. - Add a set of accessor functions for the circuit timeout data
  17239. structure. Fixes ticket 6153; patch from "piet".
  17240. - Clean up exit paths from connection_listener_new(). Closes ticket
  17241. 8789. Patch from Arlo Breault.
  17242. - Since we rely on OpenSSL 0.9.8 now, we can use EVP_PKEY_cmp()
  17243. and drop our own custom pkey_eq() implementation. Fixes bug 9043.
  17244. - Use a doubly-linked list to implement the global circuit list.
  17245. Resolves ticket 9108. Patch from Marek Majkowski.
  17246. - Remove contrib/id_to_fp.c since it wasn't used anywhere.
  17247. - Remove constants and tests for PKCS1 padding; it's insecure and
  17248. shouldn't be used for anything new. Fixes bug 8792; patch
  17249. from Arlo Breault.
  17250. - Remove instances of strcpy() from the unit tests. They weren't
  17251. hurting anything, since they were only in the unit tests, but it's
  17252. embarrassing to have strcpy() in the code at all, and some analysis
  17253. tools don't like it. Fixes bug 8790; bugfix on 0.2.3.6-alpha and
  17254. 0.2.3.8-alpha. Patch from Arlo Breault.
  17255. - Remove is_internal_IP() function. Resolves ticket 4645.
  17256. - Remove unused function circuit_dump_by_chan from circuitlist.c.
  17257. Closes issue 9107; patch from "marek".
  17258. - Change our use of the ENUM_BF macro to avoid declarations that
  17259. confuse Doxygen.
  17260. - Get rid of router->address, since in all cases it was just the
  17261. string representation of router->addr. Resolves ticket 5528.
  17262. o Documentation:
  17263. - Adjust the URLs in the README to refer to the new locations of
  17264. several documents on the website. Fixes bug 12830. Patch from
  17265. Matt Pagan.
  17266. - Document 'reject6' and 'accept6' ExitPolicy entries. Resolves
  17267. ticket 12878.
  17268. - Update manpage to describe some of the files you can expect to
  17269. find in Tor's DataDirectory. Addresses ticket 9839.
  17270. - Clean up several option names in the manpage to match their real
  17271. names, add the missing documentation for a couple of testing and
  17272. directory authority options, remove the documentation for a
  17273. V2-directory fetching option that no longer exists. Resolves
  17274. ticket 11634.
  17275. - Correct the documentation so that it lists the correct directory
  17276. for the stats files. (They are in a subdirectory called "stats",
  17277. not "status".)
  17278. - In the manpage, move more authority-only options into the
  17279. directory authority section so that operators of regular directory
  17280. caches don't get confused.
  17281. - Fix the layout of the SOCKSPort flags in the manpage. Fixes bug
  17282. 11061; bugfix on 0.2.4.7-alpha.
  17283. - Resolve warnings from Doxygen.
  17284. - Document in the manpage that "KBytes" may also be written as
  17285. "kilobytes" or "KB", that "Kbits" may also be written as
  17286. "kilobits", and so forth. Closes ticket 9222.
  17287. - Document that the ClientOnly config option overrides ORPort.
  17288. Our old explanation made ClientOnly sound as though it did
  17289. nothing at all. Resolves bug 9059.
  17290. - Explain that SocksPolicy, DirPolicy, and similar options don't
  17291. take port arguments. Fixes the other part of ticket 11108.
  17292. - Fix a comment about the rend_server_descriptor_t.protocols field
  17293. to more accurately describe its range. Also, make that field
  17294. unsigned, to more accurately reflect its usage. Fixes bug 9099;
  17295. bugfix on 0.2.1.5-alpha.
  17296. - Fix the manpage's description of HiddenServiceAuthorizeClient:
  17297. the maximum client name length is 16, not 19. Fixes bug 11118;
  17298. bugfix on 0.2.1.6-alpha.
  17299. o Package cleanup:
  17300. - The contrib directory has been sorted and tidied. Before, it was
  17301. an unsorted dumping ground for useful and not-so-useful things.
  17302. Now, it is divided based on functionality, and the items which
  17303. seemed to be nonfunctional or useless have been removed. Resolves
  17304. ticket 8966; based on patches from "rl1987".
  17305. o Removed code and features:
  17306. - Clients now reject any directory authority certificates lacking
  17307. a dir-key-crosscert element. These have been included since
  17308. 0.2.1.9-alpha, so there's no real reason for them to be optional
  17309. any longer. Completes proposal 157. Resolves ticket 10162.
  17310. - Remove all code that existed to support the v2 directory system,
  17311. since there are no longer any v2 directory authorities. Resolves
  17312. ticket 10758.
  17313. - Remove the HSAuthoritativeDir and AlternateHSAuthority torrc
  17314. options, which were used for designating authorities as "Hidden
  17315. service authorities". There has been no use of hidden service
  17316. authorities since 0.2.2.1-alpha, when we stopped uploading or
  17317. downloading v0 hidden service descriptors. Fixes bug 10881; also
  17318. part of a fix for bug 10841.
  17319. - Remove /tor/dbg-stability.txt URL that was meant to help debug WFU
  17320. and MTBF calculations, but that nobody was using. Fixes bug 11742.
  17321. - The TunnelDirConns and PreferTunnelledDirConns options no longer
  17322. exist; tunneled directory connections have been available since
  17323. 0.1.2.5-alpha, and turning them off is not a good idea. This is a
  17324. brute-force fix for 10849, where "TunnelDirConns 0" would break
  17325. hidden services.
  17326. - Remove all code for the long unused v1 directory protocol.
  17327. Resolves ticket 11070.
  17328. - Remove all remaining code related to version-0 hidden service
  17329. descriptors: they have not been in use since 0.2.2.1-alpha. Fixes
  17330. the rest of bug 10841.
  17331. - Remove migration code from when we renamed the "cached-routers"
  17332. file to "cached-descriptors" back in 0.2.0.8-alpha. This
  17333. incidentally resolves ticket 6502 by cleaning up the related code
  17334. a bit. Patch from Akshay Hebbar.
  17335. o Test infrastructure:
  17336. - Tor now builds each source file in two modes: a mode that avoids
  17337. exposing identifiers needlessly, and another mode that exposes
  17338. more identifiers for testing. This lets the compiler do better at
  17339. optimizing the production code, while enabling us to take more
  17340. radical measures to let the unit tests test things.
  17341. - The production builds no longer include functions used only in
  17342. the unit tests; all functions exposed from a module only for
  17343. unit-testing are now static in production builds.
  17344. - Add an --enable-coverage configuration option to make the unit
  17345. tests (and a new src/or/tor-cov target) to build with gcov test
  17346. coverage support.
  17347. - Update to the latest version of tinytest.
  17348. - Improve the tinytest implementation of string operation tests so
  17349. that comparisons with NULL strings no longer crash the tests; they
  17350. now just fail, normally. Fixes bug 9004; bugfix on 0.2.2.4-alpha.
  17351. - New macros in test.h to simplify writing mock-functions for unit
  17352. tests. Part of ticket 11507. Patch from Dana Koch.
  17353. - We now have rudimentary function mocking support that our unit
  17354. tests can use to test functions in isolation. Function mocking
  17355. lets the tests temporarily replace a function's dependencies with
  17356. stub functions, so that the tests can check the function without
  17357. invoking the other functions it calls.
  17358. o Testing:
  17359. - Complete tests for the status.c module. Resolves ticket 11507.
  17360. Patch from Dana Koch.
  17361. - Add more unit tests for the <circid,channel>->circuit map, and
  17362. the destroy-cell-tracking code to fix bug 7912.
  17363. - Unit tests for failing cases of the TAP onion handshake.
  17364. - More unit tests for address-manipulation functions.
  17365. o Distribution (systemd):
  17366. - Include a tor.service file in contrib/dist for use with systemd.
  17367. Some distributions will be able to use this file unmodified;
  17368. others will need to tweak it, or write their own. Patch from Jamie
  17369. Nguyen; resolves ticket 8368.
  17370. - Verify configuration file via ExecStartPre in the systemd unit
  17371. file. Patch from intrigeri; resolves ticket 12730.
  17372. - Explicitly disable RunAsDaemon in the systemd unit file. Our
  17373. current systemd unit uses "Type = simple", so systemd does not
  17374. expect tor to fork. If the user has "RunAsDaemon 1" in their
  17375. torrc, then things won't work as expected. This is e.g. the case
  17376. on Debian (and derivatives), since there we pass "--defaults-torrc
  17377. /usr/share/tor/tor-service-defaults-torrc" (that contains
  17378. "RunAsDaemon 1") by default. Patch by intrigeri; resolves
  17379. ticket 12731.
  17380. Changes in version 0.2.4.25 - 2014-10-20
  17381. Tor 0.2.4.25 disables SSL3 in response to the recent "POODLE" attack
  17382. (even though POODLE does not affect Tor). It also works around a crash
  17383. bug caused by some operating systems' response to the "POODLE" attack
  17384. (which does affect Tor).
  17385. o Major security fixes (also in 0.2.5.9-rc):
  17386. - Disable support for SSLv3. All versions of OpenSSL in use with Tor
  17387. today support TLS 1.0 or later, so we can safely turn off support
  17388. for this old (and insecure) protocol. Fixes bug 13426.
  17389. o Major bugfixes (openssl bug workaround, also in 0.2.5.9-rc):
  17390. - Avoid crashing when using OpenSSL version 0.9.8zc, 1.0.0o, or
  17391. 1.0.1j, built with the 'no-ssl3' configuration option. Fixes bug
  17392. 13471. This is a workaround for an OpenSSL bug.
  17393. Changes in version 0.2.4.24 - 2014-09-22
  17394. Tor 0.2.4.24 fixes a bug that affects consistency and speed when
  17395. connecting to hidden services, and it updates the location of one of
  17396. the directory authorities.
  17397. o Major bugfixes:
  17398. - Clients now send the correct address for their chosen rendezvous
  17399. point when trying to access a hidden service. They used to send
  17400. the wrong address, which would still work some of the time because
  17401. they also sent the identity digest of the rendezvous point, and if
  17402. the hidden service happened to try connecting to the rendezvous
  17403. point from a relay that already had a connection open to it,
  17404. the relay would reuse that connection. Now connections to hidden
  17405. services should be more robust and faster. Also, this bug meant
  17406. that clients were leaking to the hidden service whether they were
  17407. on a little-endian (common) or big-endian (rare) system, which for
  17408. some users might have reduced their anonymity. Fixes bug 13151;
  17409. bugfix on 0.2.1.5-alpha.
  17410. o Directory authority changes:
  17411. - Change IP address for gabelmoo (v3 directory authority).
  17412. o Minor features (geoip):
  17413. - Update geoip and geoip6 to the August 7 2014 Maxmind GeoLite2
  17414. Country database.
  17415. Changes in version 0.2.4.23 - 2014-07-28
  17416. Tor 0.2.4.23 brings us a big step closer to slowing down the risk from
  17417. guard rotation, and also backports several important fixes from the
  17418. Tor 0.2.5 alpha release series.
  17419. o Major features:
  17420. - Clients now look at the "usecreatefast" consensus parameter to
  17421. decide whether to use CREATE_FAST or CREATE cells for the first hop
  17422. of their circuit. This approach can improve security on connections
  17423. where Tor's circuit handshake is stronger than the available TLS
  17424. connection security levels, but the tradeoff is more computational
  17425. load on guard relays. Implements proposal 221. Resolves ticket 9386.
  17426. - Make the number of entry guards configurable via a new
  17427. NumEntryGuards consensus parameter, and the number of directory
  17428. guards configurable via a new NumDirectoryGuards consensus
  17429. parameter. Implements ticket 12688.
  17430. o Major bugfixes:
  17431. - Fix a bug in the bounds-checking in the 32-bit curve25519-donna
  17432. implementation that caused incorrect results on 32-bit
  17433. implementations when certain malformed inputs were used along with
  17434. a small class of private ntor keys. This bug does not currently
  17435. appear to allow an attacker to learn private keys or impersonate a
  17436. Tor server, but it could provide a means to distinguish 32-bit Tor
  17437. implementations from 64-bit Tor implementations. Fixes bug 12694;
  17438. bugfix on 0.2.4.8-alpha. Bug found by Robert Ransom; fix from
  17439. Adam Langley.
  17440. o Minor bugfixes:
  17441. - Warn and drop the circuit if we receive an inbound 'relay early'
  17442. cell. Those used to be normal to receive on hidden service circuits
  17443. due to bug 1038, but the buggy Tor versions are long gone from
  17444. the network so we can afford to resume watching for them. Resolves
  17445. the rest of bug 1038; bugfix on 0.2.1.19.
  17446. - Correct a confusing error message when trying to extend a circuit
  17447. via the control protocol but we don't know a descriptor or
  17448. microdescriptor for one of the specified relays. Fixes bug 12718;
  17449. bugfix on 0.2.3.1-alpha.
  17450. - Avoid an illegal read from stack when initializing the TLS
  17451. module using a version of OpenSSL without all of the ciphers
  17452. used by the v2 link handshake. Fixes bug 12227; bugfix on
  17453. 0.2.4.8-alpha. Found by "starlight".
  17454. o Minor features:
  17455. - Update geoip and geoip6 to the July 10 2014 Maxmind GeoLite2
  17456. Country database.
  17457. Changes in version 0.2.4.22 - 2014-05-16
  17458. Tor 0.2.4.22 backports numerous high-priority fixes from the Tor 0.2.5
  17459. alpha release series. These include blocking all authority signing
  17460. keys that may have been affected by the OpenSSL "heartbleed" bug,
  17461. choosing a far more secure set of TLS ciphersuites by default, closing
  17462. a couple of memory leaks that could be used to run a target relay out
  17463. of RAM, and several others.
  17464. o Major features (security, backport from 0.2.5.4-alpha):
  17465. - Block authority signing keys that were used on authorities
  17466. vulnerable to the "heartbleed" bug in OpenSSL (CVE-2014-0160). (We
  17467. don't have any evidence that these keys _were_ compromised; we're
  17468. doing this to be prudent.) Resolves ticket 11464.
  17469. o Major bugfixes (security, OOM):
  17470. - Fix a memory leak that could occur if a microdescriptor parse
  17471. fails during the tokenizing step. This bug could enable a memory
  17472. exhaustion attack by directory servers. Fixes bug 11649; bugfix
  17473. on 0.2.2.6-alpha.
  17474. o Major bugfixes (TLS cipher selection, backport from 0.2.5.4-alpha):
  17475. - The relay ciphersuite list is now generated automatically based on
  17476. uniform criteria, and includes all OpenSSL ciphersuites with
  17477. acceptable strength and forward secrecy. Previously, we had left
  17478. some perfectly fine ciphersuites unsupported due to omission or
  17479. typo. Resolves bugs 11513, 11492, 11498, 11499. Bugs reported by
  17480. 'cypherpunks'. Bugfix on 0.2.4.8-alpha.
  17481. - Relays now trust themselves to have a better view than clients of
  17482. which TLS ciphersuites are better than others. (Thanks to bug
  17483. 11513, the relay list is now well-considered, whereas the client
  17484. list has been chosen mainly for anti-fingerprinting purposes.)
  17485. Relays prefer: AES over 3DES; then ECDHE over DHE; then GCM over
  17486. CBC; then SHA384 over SHA256 over SHA1; and last, AES256 over
  17487. AES128. Resolves ticket 11528.
  17488. - Clients now try to advertise the same list of ciphersuites as
  17489. Firefox 28. This change enables selection of (fast) GCM
  17490. ciphersuites, disables some strange old ciphers, and stops
  17491. advertising the ECDH (not to be confused with ECDHE) ciphersuites.
  17492. Resolves ticket 11438.
  17493. o Minor bugfixes (configuration, security):
  17494. - When running a hidden service, do not allow TunneledDirConns 0:
  17495. trying to set that option together with a hidden service would
  17496. otherwise prevent the hidden service from running, and also make
  17497. it publish its descriptors directly over HTTP. Fixes bug 10849;
  17498. bugfix on 0.2.1.1-alpha.
  17499. o Minor bugfixes (controller, backport from 0.2.5.4-alpha):
  17500. - Avoid sending a garbage value to the controller when a circuit is
  17501. cannibalized. Fixes bug 11519; bugfix on 0.2.3.11-alpha.
  17502. o Minor bugfixes (exit relay, backport from 0.2.5.4-alpha):
  17503. - Stop leaking memory when we successfully resolve a PTR record.
  17504. Fixes bug 11437; bugfix on 0.2.4.7-alpha.
  17505. o Minor bugfixes (bridge client, backport from 0.2.5.4-alpha):
  17506. - Avoid 60-second delays in the bootstrapping process when Tor is
  17507. launching for a second time while using bridges. Fixes bug 9229;
  17508. bugfix on 0.2.0.3-alpha.
  17509. o Minor bugfixes (relays and bridges, backport from 0.2.5.4-alpha):
  17510. - Give the correct URL in the warning message when trying to run a
  17511. relay on an ancient version of Windows. Fixes bug 9393.
  17512. o Minor bugfixes (compilation):
  17513. - Fix a compilation error when compiling with --disable-curve25519.
  17514. Fixes bug 9700; bugfix on 0.2.4.17-rc.
  17515. o Minor bugfixes:
  17516. - Downgrade the warning severity for the the "md was still
  17517. referenced 1 node(s)" warning. Tor 0.2.5.4-alpha has better code
  17518. for trying to diagnose this bug, and the current warning in
  17519. earlier versions of tor achieves nothing useful. Addresses warning
  17520. from bug 7164.
  17521. o Minor features (log verbosity, backport from 0.2.5.4-alpha):
  17522. - When we run out of usable circuit IDs on a channel, log only one
  17523. warning for the whole channel, and describe how many circuits
  17524. there were on the channel. Fixes part of ticket 11553.
  17525. o Minor features (security, backport from 0.2.5.4-alpha):
  17526. - Decrease the lower limit of MaxMemInCellQueues to 256 MBytes (but
  17527. leave the default at 8GBytes), to better support Raspberry Pi
  17528. users. Fixes bug 9686; bugfix on 0.2.4.14-alpha.
  17529. o Documentation (backport from 0.2.5.4-alpha):
  17530. - Correctly document that we search for a system torrc file before
  17531. looking in ~/.torrc. Fixes documentation side of 9213; bugfix on
  17532. 0.2.3.18-rc.
  17533. Changes in version 0.2.4.21 - 2014-02-28
  17534. Tor 0.2.4.21 further improves security against potential adversaries who
  17535. find breaking 1024-bit crypto doable, and backports several stability
  17536. and robustness patches from the 0.2.5 branch.
  17537. o Major features (client security):
  17538. - When we choose a path for a 3-hop circuit, make sure it contains
  17539. at least one relay that supports the NTor circuit extension
  17540. handshake. Otherwise, there is a chance that we're building
  17541. a circuit that's worth attacking by an adversary who finds
  17542. breaking 1024-bit crypto doable, and that chance changes the game
  17543. theory. Implements ticket 9777.
  17544. o Major bugfixes:
  17545. - Do not treat streams that fail with reason
  17546. END_STREAM_REASON_INTERNAL as indicating a definite circuit failure,
  17547. since it could also indicate an ENETUNREACH connection error. Fixes
  17548. part of bug 10777; bugfix on 0.2.4.8-alpha.
  17549. o Code simplification and refactoring:
  17550. - Remove data structures which were introduced to implement the
  17551. CellStatistics option: they are now redundant with the new timestamp
  17552. field in the regular packed_cell_t data structure, which we did
  17553. in 0.2.4.18-rc in order to resolve bug 9093. Resolves ticket 10870.
  17554. o Minor features:
  17555. - Always clear OpenSSL bignums before freeing them -- even bignums
  17556. that don't contain secrets. Resolves ticket 10793. Patch by
  17557. Florent Daigniere.
  17558. - Build without warnings under clang 3.4. (We have some macros that
  17559. define static functions only some of which will get used later in
  17560. the module. Starting with clang 3.4, these give a warning unless the
  17561. unused attribute is set on them.) Resolves ticket 10904.
  17562. - Update geoip and geoip6 files to the February 7 2014 Maxmind
  17563. GeoLite2 Country database.
  17564. o Minor bugfixes:
  17565. - Set the listen() backlog limit to the largest actually supported
  17566. on the system, not to the value in a header file. Fixes bug 9716;
  17567. bugfix on every released Tor.
  17568. - Treat ENETUNREACH, EACCES, and EPERM connection failures at an
  17569. exit node as a NOROUTE error, not an INTERNAL error, since they
  17570. can apparently happen when trying to connect to the wrong sort
  17571. of netblocks. Fixes part of bug 10777; bugfix on 0.1.0.1-rc.
  17572. - Fix build warnings about missing "a2x" comment when building the
  17573. manpages from scratch on OpenBSD; OpenBSD calls it "a2x.py".
  17574. Fixes bug 10929; bugfix on 0.2.2.9-alpha. Patch from Dana Koch.
  17575. - Avoid a segfault on SIGUSR1, where we had freed a connection but did
  17576. not entirely remove it from the connection lists. Fixes bug 9602;
  17577. bugfix on 0.2.4.4-alpha.
  17578. - Fix a segmentation fault in our benchmark code when running with
  17579. Fedora's OpenSSL package, or any other OpenSSL that provides
  17580. ECDH but not P224. Fixes bug 10835; bugfix on 0.2.4.8-alpha.
  17581. - Turn "circuit handshake stats since last time" log messages into a
  17582. heartbeat message. Fixes bug 10485; bugfix on 0.2.4.17-rc.
  17583. o Documentation fixes:
  17584. - Document that all but one DirPort entry must have the NoAdvertise
  17585. flag set. Fixes bug 10470; bugfix on 0.2.3.3-alpha / 0.2.3.16-alpha.
  17586. Changes in version 0.2.4.20 - 2013-12-22
  17587. Tor 0.2.4.20 fixes potentially poor random number generation for users
  17588. who 1) use OpenSSL 1.0.0 or later, 2) set "HardwareAccel 1" in their
  17589. torrc file, 3) have "Sandy Bridge" or "Ivy Bridge" Intel processors,
  17590. and 4) have no state file in their DataDirectory (as would happen on
  17591. first start). Users who generated relay or hidden service identity
  17592. keys in such a situation should discard them and generate new ones.
  17593. This release also fixes a logic error that caused Tor clients to build
  17594. many more preemptive circuits than they actually need.
  17595. o Major bugfixes:
  17596. - Do not allow OpenSSL engines to replace the PRNG, even when
  17597. HardwareAccel is set. The only default builtin PRNG engine uses
  17598. the Intel RDRAND instruction to replace the entire PRNG, and
  17599. ignores all attempts to seed it with more entropy. That's
  17600. cryptographically stupid: the right response to a new alleged
  17601. entropy source is never to discard all previously used entropy
  17602. sources. Fixes bug 10402; works around behavior introduced in
  17603. OpenSSL 1.0.0. Diagnosis and investigation thanks to "coderman"
  17604. and "rl1987".
  17605. - Fix assertion failure when AutomapHostsOnResolve yields an IPv6
  17606. address. Fixes bug 10465; bugfix on 0.2.4.7-alpha.
  17607. - Avoid launching spurious extra circuits when a stream is pending.
  17608. This fixes a bug where any circuit that _wasn't_ unusable for new
  17609. streams would be treated as if it were, causing extra circuits to
  17610. be launched. Fixes bug 10456; bugfix on 0.2.4.12-alpha.
  17611. o Minor bugfixes:
  17612. - Avoid a crash bug when starting with a corrupted microdescriptor
  17613. cache file. Fixes bug 10406; bugfix on 0.2.2.6-alpha.
  17614. - If we fail to dump a previously cached microdescriptor to disk, avoid
  17615. freeing duplicate data later on. Fixes bug 10423; bugfix on
  17616. 0.2.4.13-alpha. Spotted by "bobnomnom".
  17617. Changes in version 0.2.4.19 - 2013-12-11
  17618. The Tor 0.2.4 release series is dedicated to the memory of Aaron Swartz
  17619. (1986-2013). Aaron worked on diverse projects including helping to guide
  17620. Creative Commons, playing a key role in stopping SOPA/PIPA, bringing
  17621. transparency to the U.S government's PACER documents, and contributing
  17622. design and development for Tor and Tor2Web. Aaron was one of the latest
  17623. martyrs in our collective fight for civil liberties and human rights,
  17624. and his death is all the more painful because he was one of us.
  17625. Tor 0.2.4.19, the first stable release in the 0.2.4 branch, features
  17626. a new circuit handshake and link encryption that use ECC to provide
  17627. better security and efficiency; makes relays better manage circuit
  17628. creation requests; uses "directory guards" to reduce client enumeration
  17629. risks; makes bridges collect and report statistics about the pluggable
  17630. transports they support; cleans up and improves our geoip database;
  17631. gets much closer to IPv6 support for clients, bridges, and relays; makes
  17632. directory authorities use measured bandwidths rather than advertised
  17633. ones when computing flags and thresholds; disables client-side DNS
  17634. caching to reduce tracking risks; and fixes a big bug in bridge
  17635. reachability testing. This release introduces two new design
  17636. abstractions in the code: a new "channel" abstraction between circuits
  17637. and or_connections to allow for implementing alternate relay-to-relay
  17638. transports, and a new "circuitmux" abstraction storing the queue of
  17639. circuits for a channel. The release also includes many stability,
  17640. security, and privacy fixes.
  17641. o Major features (new circuit handshake):
  17642. - Tor now supports a new circuit extension handshake designed by Ian
  17643. Goldberg, Douglas Stebila, and Berkant Ustaoglu. Our original
  17644. circuit extension handshake, later called "TAP", was a bit slow
  17645. (especially on the relay side), had a fragile security proof, and
  17646. used weaker keys than we'd now prefer. The new circuit handshake
  17647. uses Dan Bernstein's "curve25519" elliptic-curve Diffie-Hellman
  17648. function, making it significantly more secure than the older
  17649. handshake, and significantly faster. Tor can use one of two built-in
  17650. pure-C curve25519-donna implementations by Adam Langley, or it
  17651. can link against the "nacl" library for a tuned version if present.
  17652. The built-in version is very fast for 64-bit systems when building
  17653. with GCC. The built-in 32-bit version is still faster than the
  17654. old TAP protocol, but using libnacl is better on most such hosts.
  17655. Implements proposal 216; closes ticket 7202.
  17656. o Major features (better link encryption):
  17657. - Relays can now enable the ECDHE TLS ciphersuites when available
  17658. and appropriate. These ciphersuites let us negotiate forward-secure
  17659. TLS secret keys more safely and more efficiently than with our
  17660. previous use of Diffie-Hellman modulo a 1024-bit prime. By default,
  17661. public relays prefer the (faster) P224 group, and bridges prefer
  17662. the (more common) P256 group; you can override this with the
  17663. TLSECGroup option.
  17664. This feature requires clients running 0.2.3.17-beta or later,
  17665. and requires both sides to be running OpenSSL 1.0.0 or later
  17666. with ECC support. OpenSSL 1.0.1, with the compile-time option
  17667. "enable-ec_nistp_64_gcc_128", is highly recommended.
  17668. Implements the relay side of proposal 198; closes ticket 7200.
  17669. - Re-enable TLS 1.1 and 1.2 when built with OpenSSL 1.0.1e or later.
  17670. Resolves ticket 6055. (OpenSSL before 1.0.1 didn't have TLS 1.1 or
  17671. 1.2, and OpenSSL from 1.0.1 through 1.0.1d had bugs that prevented
  17672. renegotiation from working with TLS 1.1 or 1.2, so we had disabled
  17673. them to solve bug 6033.)
  17674. o Major features (relay performance):
  17675. - Instead of limiting the number of queued onionskins (aka circuit
  17676. create requests) to a fixed, hard-to-configure number, we limit
  17677. the size of the queue based on how many we expect to be able to
  17678. process in a given amount of time. We estimate the time it will
  17679. take to process an onionskin based on average processing time
  17680. of previous onionskins. Closes ticket 7291. You'll never have to
  17681. configure MaxOnionsPending again.
  17682. - Relays process the new "NTor" circuit-level handshake requests
  17683. with higher priority than the old "TAP" circuit-level handshake
  17684. requests. We still process some TAP requests to not totally starve
  17685. 0.2.3 clients when NTor becomes popular. A new consensus parameter
  17686. "NumNTorsPerTAP" lets us tune the balance later if we need to.
  17687. Implements ticket 9574.
  17688. o Major features (client bootstrapping resilience):
  17689. - Add a new "FallbackDir" torrc option to use when we can't use
  17690. a directory mirror from the consensus (either because we lack a
  17691. consensus, or because they're all down). Currently, all authorities
  17692. are fallbacks by default, and there are no other default fallbacks,
  17693. but that will change. This option will allow us to give clients a
  17694. longer list of servers to try to get a consensus from when first
  17695. connecting to the Tor network, and thereby reduce load on the
  17696. directory authorities. Implements proposal 206, "Preconfigured
  17697. directory sources for bootstrapping". We also removed the old
  17698. "FallbackNetworkstatus" option, since we never got it working well
  17699. enough to use it. Closes bug 572.
  17700. - If we have no circuits open, use a relaxed timeout (the
  17701. 95th-percentile cutoff) until a circuit succeeds. This heuristic
  17702. should allow Tor to succeed at building circuits even when the
  17703. network connection drastically changes. Should help with bug 3443.
  17704. o Major features (use of guards):
  17705. - Support directory guards (proposal 207): when possible, clients now
  17706. use their entry guards for non-anonymous directory requests. This
  17707. can help prevent client enumeration. Note that this behavior only
  17708. works when we have a usable consensus directory, and when options
  17709. about what to download are more or less standard. In the future we
  17710. should re-bootstrap from our guards, rather than re-bootstrapping
  17711. from the preconfigured list of directory sources that ships with
  17712. Tor. Resolves ticket 6526.
  17713. - Raise the default time that a client keeps an entry guard from
  17714. "1-2 months" to "2-3 months", as suggested by Tariq Elahi's WPES
  17715. 2012 paper. (We would make it even longer, but we need better client
  17716. load balancing first.) Also, make the guard lifetime controllable
  17717. via a new GuardLifetime torrc option and a GuardLifetime consensus
  17718. parameter. Start of a fix for bug 8240; bugfix on 0.1.1.11-alpha.
  17719. o Major features (bridges with pluggable transports):
  17720. - Bridges now report the pluggable transports they support to the
  17721. bridge authority, so it can pass the supported transports on to
  17722. bridgedb and/or eventually do reachability testing. Implements
  17723. ticket 3589.
  17724. - Automatically forward the TCP ports of pluggable transport
  17725. proxies using tor-fw-helper if PortForwarding is enabled. Implements
  17726. ticket 4567.
  17727. o Major features (geoip database):
  17728. - Maxmind began labelling Tor relays as being in country "A1",
  17729. which breaks by-country node selection inside Tor. Now we use a
  17730. script to replace "A1" ("Anonymous Proxy") entries in our geoip
  17731. file with real country codes. This script fixes about 90% of "A1"
  17732. entries automatically and uses manual country code assignments to
  17733. fix the remaining 10%. See src/config/README.geoip for details.
  17734. Fixes bug 6266.
  17735. - Add GeoIP database for IPv6 addresses. The new config option
  17736. is GeoIPv6File.
  17737. - Update to the October 2 2013 Maxmind GeoLite Country database.
  17738. o Major features (IPv6):
  17739. - Clients who set "ClientUseIPv6 1" may connect to entry nodes over
  17740. IPv6. Set "ClientPreferIPv6ORPort 1" to make this even more likely
  17741. to happen. Implements ticket 5535.
  17742. - All kind of relays, not just bridges, can now advertise an IPv6
  17743. OR port. Implements ticket 6362.
  17744. - Relays can now exit to IPv6 addresses: make sure that you have IPv6
  17745. connectivity, then set the IPv6Exit flag to 1. Also make sure your
  17746. exit policy reads as you would like: the address * applies to all
  17747. address families, whereas *4 is IPv4 address only, and *6 is IPv6
  17748. addresses only. On the client side, you'll need to wait for enough
  17749. exits to support IPv6, apply the "IPv6Traffic" flag to a SocksPort,
  17750. and use Socks5. Closes ticket 5547, implements proposal 117 as
  17751. revised in proposal 208.
  17752. - Bridge authorities now accept IPv6 bridge addresses and include
  17753. them in network status documents. Implements ticket 5534.
  17754. - Directory authorities vote on IPv6 OR ports. Implements ticket 6363.
  17755. o Major features (directory authorities):
  17756. - Directory authorities now prefer using measured bandwidths to
  17757. advertised ones when computing flags and thresholds. Resolves
  17758. ticket 8273.
  17759. - Directory authorities that vote measured bandwidths about more
  17760. than a threshold number of relays now treat relays with
  17761. unmeasured bandwidths as having bandwidth 0 when computing their
  17762. flags. Resolves ticket 8435.
  17763. - Directory authorities now support a new consensus method (17)
  17764. where they cap the published bandwidth of relays for which
  17765. insufficient bandwidth measurements exist. Fixes part of bug 2286.
  17766. - Directory authorities that set "DisableV2DirectoryInfo_ 1" no longer
  17767. serve any v2 directory information. Now we can test disabling the
  17768. old deprecated v2 directory format, and see whether doing so has
  17769. any effect on network load. Begins to fix bug 6783.
  17770. o Major features (build and portability):
  17771. - Switch to a nonrecursive Makefile structure. Now instead of each
  17772. Makefile.am invoking other Makefile.am's, there is a master
  17773. Makefile.am that includes the others. This change makes our build
  17774. process slightly more maintainable, and improves parallelism for
  17775. building with make -j. Original patch by Stewart Smith; various
  17776. fixes by Jim Meyering.
  17777. - Where available, we now use automake's "silent" make rules by
  17778. default, so that warnings are easier to spot. You can get the old
  17779. behavior with "make V=1". Patch by Stewart Smith for ticket 6522.
  17780. - Resume building correctly with MSVC and Makefile.nmake. This patch
  17781. resolves numerous bugs and fixes reported by ultramage, including
  17782. 7305, 7308, 7309, 7310, 7312, 7313, 7315, 7316, and 7669.
  17783. o Security features:
  17784. - Switch to a completely time-invariant approach for picking nodes
  17785. weighted by bandwidth. Our old approach would run through the
  17786. part of the loop after it had made its choice slightly slower
  17787. than it ran through the part of the loop before it had made its
  17788. choice. Addresses ticket 6538.
  17789. - Disable the use of Guard nodes when in Tor2WebMode. Guard usage
  17790. by tor2web clients allows hidden services to identify tor2web
  17791. clients through their repeated selection of the same rendezvous
  17792. and introduction point circuit endpoints (their guards). Resolves
  17793. ticket 6888.
  17794. o Major bugfixes (relay denial of service):
  17795. - When we have too much memory queued in circuits (according to a new
  17796. MaxMemInCellQueues option), close the circuits that have the oldest
  17797. queued cells, on the theory that those are most responsible for
  17798. us running low on memory. This prevents us from running out of
  17799. memory as a relay if circuits fill up faster than they can be
  17800. drained. Fixes bugs 9063 and 9093; bugfix on the 54th commit of
  17801. Tor. This bug is a further fix beyond bug 6252, whose fix was
  17802. merged into 0.2.3.21-rc.
  17803. - Reject bogus create and relay cells with 0 circuit ID or 0 stream
  17804. ID: these could be used to create unexpected streams and circuits
  17805. which would count as "present" to some parts of Tor but "absent"
  17806. to others, leading to zombie circuits and streams or to a bandwidth
  17807. denial-of-service. Fixes bug 7889; bugfix on every released version
  17808. of Tor. Reported by "oftc_must_be_destroyed".
  17809. - Avoid a bug where our response to TLS renegotiation under certain
  17810. network conditions could lead to a busy-loop, with 100% CPU
  17811. consumption. Fixes bug 5650; bugfix on 0.2.0.16-alpha.
  17812. o Major bugfixes (asserts, crashes, leaks):
  17813. - Prevent the get_freelists() function from running off the end of
  17814. the list of freelists if it somehow gets an unrecognized
  17815. allocation. Fixes bug 8844; bugfix on 0.2.0.16-alpha. Reported by
  17816. eugenis.
  17817. - Avoid a memory leak where we would leak a consensus body when we
  17818. find that a consensus which we couldn't previously verify due to
  17819. missing certificates is now verifiable. Fixes bug 8719; bugfix
  17820. on 0.2.0.10-alpha.
  17821. - If we are unable to save a microdescriptor to the journal, do not
  17822. drop it from memory and then reattempt downloading it. Fixes bug
  17823. 9645; bugfix on 0.2.2.6-alpha.
  17824. - Fix an assertion failure that would occur when disabling the
  17825. ORPort setting on a running Tor process while accounting was
  17826. enabled. Fixes bug 6979; bugfix on 0.2.2.18-alpha.
  17827. - Avoid an assertion failure on OpenBSD (and perhaps other BSDs)
  17828. when an exit connection with optimistic data succeeds immediately
  17829. rather than returning EINPROGRESS. Fixes bug 9017; bugfix on
  17830. 0.2.3.1-alpha.
  17831. - Fix a memory leak that would occur whenever a configuration
  17832. option changed. Fixes bug 8718; bugfix on 0.2.3.3-alpha.
  17833. o Major bugfixes (relay rate limiting):
  17834. - When a TLS write is partially successful but incomplete, remember
  17835. that the flushed part has been flushed, and notice that bytes were
  17836. actually written. Reported and fixed pseudonymously. Fixes bug 7708;
  17837. bugfix on Tor 0.1.0.5-rc.
  17838. - Raise the default BandwidthRate/BandwidthBurst values from 5MB/10MB
  17839. to 1GB/1GB. The previous defaults were intended to be "basically
  17840. infinite", but it turns out they're now limiting our 100mbit+
  17841. relays and bridges. Fixes bug 6605; bugfix on 0.2.0.10-alpha (the
  17842. last time we raised it).
  17843. - No longer stop reading or writing on cpuworker connections when
  17844. our rate limiting buckets go empty. Now we should handle circuit
  17845. handshake requests more promptly. Resolves bug 9731.
  17846. o Major bugfixes (client-side privacy):
  17847. - When we mark a circuit as unusable for new circuits, have it
  17848. continue to be unusable for new circuits even if MaxCircuitDirtiness
  17849. is increased too much at the wrong time, or the system clock jumps
  17850. backwards. Fixes bug 6174; bugfix on 0.0.2pre26.
  17851. - If ClientDNSRejectInternalAddresses ("do not believe DNS queries
  17852. which have resolved to internal addresses") is set, apply that
  17853. rule to IPv6 as well. Fixes bug 8475; bugfix on 0.2.0.7-alpha.
  17854. - When an exit relay rejects a stream with reason "exit policy", but
  17855. we only know an exit policy summary (e.g. from the microdesc
  17856. consensus) for it, do not mark the relay as useless for all exiting.
  17857. Instead, mark just the circuit as unsuitable for that particular
  17858. address. Fixes part of bug 7582; bugfix on 0.2.3.2-alpha.
  17859. o Major bugfixes (stream isolation):
  17860. - Allow applications to get proper stream isolation with
  17861. IsolateSOCKSAuth. Many SOCKS5 clients that want to offer
  17862. username/password authentication also offer "no authentication". Tor
  17863. had previously preferred "no authentication", so the applications
  17864. never actually sent Tor their auth details. Now Tor selects
  17865. username/password authentication if it's offered. You can disable
  17866. this behavior on a per-SOCKSPort basis via PreferSOCKSNoAuth. Fixes
  17867. bug 8117; bugfix on 0.2.3.3-alpha.
  17868. - Follow the socks5 protocol when offering username/password
  17869. authentication. The fix for bug 8117 exposed this bug, and it
  17870. turns out real-world applications like Pidgin do care. Bugfix on
  17871. 0.2.3.2-alpha; fixes bug 8879.
  17872. o Major bugfixes (client circuit building):
  17873. - Alter circuit build timeout measurement to start at the point
  17874. where we begin the CREATE/CREATE_FAST step (as opposed to circuit
  17875. initialization). This should make our timeout measurements more
  17876. uniform. Previously, we were sometimes including ORconn setup time
  17877. in our circuit build time measurements. Should resolve bug 3443.
  17878. - If the circuit build timeout logic is disabled (via the consensus,
  17879. or because we are an authority), then don't build testing circuits.
  17880. Fixes bug 9657; bugfix on 0.2.2.14-alpha.
  17881. o Major bugfixes (client-side DNS):
  17882. - Turn off the client-side DNS cache by default. Updating and using
  17883. the DNS cache is now configurable on a per-client-port
  17884. level. SOCKSPort, DNSPort, etc lines may now contain
  17885. {No,}Cache{IPv4,IPv6,}DNS lines to indicate that we shouldn't
  17886. cache these types of DNS answers when we receive them from an
  17887. exit node in response to an application request on this port, and
  17888. {No,}UseCached{IPv4,IPv6,DNS} lines to indicate that if we have
  17889. cached DNS answers of these types, we shouldn't use them. It's
  17890. potentially risky to use cached DNS answers at the client, since
  17891. doing so can indicate to one exit what answers we've gotten
  17892. for DNS lookups in the past. With IPv6, this becomes especially
  17893. problematic. Using cached DNS answers for requests on the same
  17894. circuit would present less linkability risk, since all traffic
  17895. on a circuit is already linkable, but it would also provide
  17896. little performance benefit: the exit node caches DNS replies
  17897. too. Implements a simplified version of Proposal 205. Implements
  17898. ticket 7570.
  17899. o Major bugfixes (hidden service privacy):
  17900. - Limit hidden service descriptors to at most ten introduction
  17901. points, to slow one kind of guard enumeration. Fixes bug 9002;
  17902. bugfix on 0.1.1.11-alpha.
  17903. o Major bugfixes (directory fetching):
  17904. - If the time to download the next old-style networkstatus is in
  17905. the future, do not decline to consider whether to download the
  17906. next microdescriptor networkstatus. Fixes bug 9564; bugfix on
  17907. 0.2.3.14-alpha.
  17908. - We used to always request authority certificates by identity digest,
  17909. meaning we'd get the newest one even when we wanted one with a
  17910. different signing key. Then we would complain about being given
  17911. a certificate we already had, and never get the one we really
  17912. wanted. Now we use the "fp-sk/" resource as well as the "fp/"
  17913. resource to request the one we want. Fixes bug 5595; bugfix on
  17914. 0.2.0.8-alpha.
  17915. o Major bugfixes (bridge reachability):
  17916. - Bridges now send AUTH_CHALLENGE cells during their v3 handshakes;
  17917. previously they did not, which prevented them from receiving
  17918. successful connections from relays for self-test or bandwidth
  17919. testing. Also, when a relay is extending a circuit to a bridge,
  17920. it needs to send a NETINFO cell, even when the bridge hasn't sent
  17921. an AUTH_CHALLENGE cell. Fixes bug 9546; bugfix on 0.2.3.6-alpha.
  17922. o Major bugfixes (control interface):
  17923. - When receiving a new configuration file via the control port's
  17924. LOADCONF command, do not treat the defaults file as absent.
  17925. Fixes bug 9122; bugfix on 0.2.3.9-alpha.
  17926. o Major bugfixes (directory authorities):
  17927. - Stop marking every relay as having been down for one hour every
  17928. time we restart a directory authority. These artificial downtimes
  17929. were messing with our Stable and Guard flag calculations. Fixes
  17930. bug 8218 (introduced by the fix for 1035). Bugfix on 0.2.2.23-alpha.
  17931. - When computing directory thresholds, ignore any rejected-as-sybil
  17932. nodes during the computation so that they can't influence Fast,
  17933. Guard, etc. (We should have done this for proposal 109.) Fixes
  17934. bug 8146.
  17935. - When marking a node as a likely sybil, reset its uptime metrics
  17936. to zero, so that it cannot time towards getting marked as Guard,
  17937. Stable, or HSDir. (We should have done this for proposal 109.) Fixes
  17938. bug 8147.
  17939. - Fix a bug in the voting algorithm that could yield incorrect results
  17940. when a non-naming authority declared too many flags. Fixes bug 9200;
  17941. bugfix on 0.2.0.3-alpha.
  17942. o Internal abstraction features:
  17943. - Introduce new channel_t abstraction between circuits and
  17944. or_connection_t to allow for implementing alternate OR-to-OR
  17945. transports. A channel_t is an abstract object which can either be a
  17946. cell-bearing channel, which is responsible for authenticating and
  17947. handshaking with the remote OR and transmitting cells to and from
  17948. it, or a listening channel, which spawns new cell-bearing channels
  17949. at the request of remote ORs. Implements part of ticket 6465.
  17950. - Make a channel_tls_t subclass of channel_t, adapting it to the
  17951. existing or_connection_t code. The V2/V3 protocol handshaking
  17952. code which formerly resided in command.c has been moved below the
  17953. channel_t abstraction layer and may be found in channeltls.c now.
  17954. Implements the rest of ticket 6465.
  17955. - Introduce new circuitmux_t storing the queue of circuits for
  17956. a channel; this encapsulates and abstracts the queue logic and
  17957. circuit selection policy, and allows the latter to be overridden
  17958. easily by switching out a policy object. The existing EWMA behavior
  17959. is now implemented as a circuitmux_policy_t. Resolves ticket 6816.
  17960. o New build requirements:
  17961. - Tor now requires OpenSSL 0.9.8 or later. OpenSSL 1.0.0 or later is
  17962. strongly recommended.
  17963. - Tor maintainers now require Automake version 1.9 or later to build
  17964. Tor from the Git repository. (Automake is not required when building
  17965. from a source distribution.)
  17966. o Minor features (protocol):
  17967. - No longer include the "opt" prefix when generating routerinfos
  17968. or v2 directories: it has been needless since Tor 0.1.2. Closes
  17969. ticket 5124.
  17970. - Reject EXTEND cells sent to nonexistent streams. According to the
  17971. spec, an EXTEND cell sent to _any_ nonzero stream ID is invalid, but
  17972. we were only checking for stream IDs that were currently in use.
  17973. Found while hunting for more instances of bug 6271. Bugfix on
  17974. 0.0.2pre8, which introduced incremental circuit construction.
  17975. - Tor relays and clients now support a better CREATE/EXTEND cell
  17976. format, allowing the sender to specify multiple address, identity,
  17977. and handshake types. Implements Robert Ransom's proposal 200;
  17978. closes ticket 7199.
  17979. - Reject as invalid most directory objects containing a NUL.
  17980. Belt-and-suspender fix for bug 8037.
  17981. o Minor features (security):
  17982. - Clear keys and key-derived material left on the stack in
  17983. rendservice.c and rendclient.c. Check return value of
  17984. crypto_pk_write_private_key_to_string() in rend_service_load_keys().
  17985. These fixes should make us more forward-secure against cold-boot
  17986. attacks and the like. Fixes bug 2385.
  17987. - Use our own weak RNG when we need a weak RNG. Windows's rand() and
  17988. Irix's random() only return 15 bits; Solaris's random() returns more
  17989. bits but its RAND_MAX says it only returns 15, and so on. Motivated
  17990. by the fix for bug 7801; bugfix on 0.2.2.20-alpha.
  17991. o Minor features (control protocol):
  17992. - Add a "GETINFO signal/names" control port command. Implements
  17993. ticket 3842.
  17994. - Provide default values for all options via "GETINFO config/defaults".
  17995. Implements ticket 4971.
  17996. - Allow an optional $ before the node identity digest in the
  17997. controller command GETINFO ns/id/<identity>, for consistency with
  17998. md/id/<identity> and desc/id/<identity>. Resolves ticket 7059.
  17999. - Add CACHED keyword to ADDRMAP events in the control protocol
  18000. to indicate whether a DNS result will be cached or not. Resolves
  18001. ticket 8596.
  18002. - Generate bootstrapping status update events correctly when fetching
  18003. microdescriptors. Fixes bug 9927.
  18004. o Minor features (path selection):
  18005. - When deciding whether we have enough descriptors to build circuits,
  18006. instead of looking at raw relay counts, look at which fraction
  18007. of (bandwidth-weighted) paths we're able to build. This approach
  18008. keeps clients from building circuits if their paths are likely to
  18009. stand out statistically. The default fraction of paths needed is
  18010. taken from the consensus directory; you can override it with the
  18011. new PathsNeededToBuildCircuits option. Fixes ticket 5956.
  18012. - When any country code is listed in ExcludeNodes or ExcludeExitNodes,
  18013. and we have GeoIP information, also exclude all nodes with unknown
  18014. countries "??" and "A1". This behavior is controlled by the
  18015. new GeoIPExcludeUnknown option: you can make such nodes always
  18016. excluded with "GeoIPExcludeUnknown 1", and disable the feature
  18017. with "GeoIPExcludeUnknown 0". Setting "GeoIPExcludeUnknown auto"
  18018. gets you the default behavior. Implements feature 7706.
  18019. o Minor features (hidden services):
  18020. - Improve circuit build timeout handling for hidden services.
  18021. In particular: adjust build timeouts more accurately depending
  18022. upon the number of hop-RTTs that a particular circuit type
  18023. undergoes. Additionally, launch intro circuits in parallel
  18024. if they timeout, and take the first one to reply as valid.
  18025. - The Tor client now ignores sub-domain components of a .onion
  18026. address. This change makes HTTP "virtual" hosting
  18027. possible: http://foo.aaaaaaaaaaaaaaaa.onion/ and
  18028. http://bar.aaaaaaaaaaaaaaaa.onion/ can be two different websites
  18029. hosted on the same hidden service. Implements proposal 204.
  18030. - Enable Tor to read configuration, state, and key information from
  18031. a FIFO. Previously Tor would only read from files with a positive
  18032. stat.st_size. Code from meejah; fixes bug 6044.
  18033. o Minor features (clients):
  18034. - Teach bridge-using clients to avoid 0.2.2.x bridges when making
  18035. microdescriptor-related dir requests, and only fall back to normal
  18036. descriptors if none of their bridges can handle microdescriptors
  18037. (as opposed to the fix in ticket 4013, which caused them to fall
  18038. back to normal descriptors if *any* of their bridges preferred
  18039. them). Resolves ticket 4994.
  18040. - Tweak tor-fw-helper to accept an arbitrary amount of arbitrary
  18041. TCP ports to forward. In the past it only accepted two ports:
  18042. the ORPort and the DirPort.
  18043. o Minor features (protecting client timestamps):
  18044. - Clients no longer send timestamps in their NETINFO cells. These were
  18045. not used for anything, and they provided one small way for clients
  18046. to be distinguished from each other as they moved from network to
  18047. network or behind NAT. Implements part of proposal 222.
  18048. - Clients now round timestamps in INTRODUCE cells down to the nearest
  18049. 10 minutes. If a new Support022HiddenServices option is set to 0, or
  18050. if it's set to "auto" and the feature is disabled in the consensus,
  18051. the timestamp is sent as 0 instead. Implements part of proposal 222.
  18052. - Stop sending timestamps in AUTHENTICATE cells. This is not such
  18053. a big deal from a security point of view, but it achieves no actual
  18054. good purpose, and isn't needed. Implements part of proposal 222.
  18055. - Reduce down accuracy of timestamps in hidden service descriptors.
  18056. Implements part of proposal 222.
  18057. o Minor features (bridges):
  18058. - Make bridge relays check once a minute for whether their IP
  18059. address has changed, rather than only every 15 minutes. Resolves
  18060. bugs 1913 and 1992.
  18061. - Bridge statistics now count bridge clients connecting over IPv6:
  18062. bridge statistics files now list "bridge-ip-versions" and
  18063. extra-info documents list "geoip6-db-digest". The control protocol
  18064. "CLIENTS_SEEN" and "ip-to-country" queries now support IPv6. Initial
  18065. implementation by "shkoo", addressing ticket 5055.
  18066. - Add a new torrc option "ServerTransportListenAddr" to let bridge
  18067. operators select the address where their pluggable transports will
  18068. listen for connections. Resolves ticket 7013.
  18069. - Randomize the lifetime of our SSL link certificate, so censors can't
  18070. use the static value for filtering Tor flows. Resolves ticket 8443;
  18071. related to ticket 4014 which was included in 0.2.2.33.
  18072. o Minor features (relays):
  18073. - Option OutboundBindAddress can be specified multiple times and
  18074. accepts IPv6 addresses. Resolves ticket 6876.
  18075. o Minor features (IPv6, client side):
  18076. - AutomapHostsOnResolve now supports IPv6 addresses. By default, we
  18077. prefer to hand out virtual IPv6 addresses, since there are more of
  18078. them and we can't run out. To override this behavior and make IPv4
  18079. addresses preferred, set NoPreferIPv6Automap on whatever SOCKSPort
  18080. or DNSPort you're using for resolving. Implements ticket 7571.
  18081. - AutomapHostsOnResolve responses are now randomized, to avoid
  18082. annoying situations where Tor is restarted and applications
  18083. connect to the wrong addresses.
  18084. - Never try more than 1000 times to pick a new virtual address when
  18085. AutomapHostsOnResolve is set. That's good enough so long as we
  18086. aren't close to handing out our entire virtual address space;
  18087. if you're getting there, it's best to switch to IPv6 virtual
  18088. addresses anyway.
  18089. o Minor features (IPv6, relay/authority side):
  18090. - New config option "AuthDirHasIPv6Connectivity 1" that directory
  18091. authorities should set if they have IPv6 connectivity and want to
  18092. do reachability tests for IPv6 relays. Implements feature 5974.
  18093. - A relay with an IPv6 OR port now sends that address in NETINFO
  18094. cells (in addition to its other address). Implements ticket 6364.
  18095. o Minor features (directory authorities):
  18096. - Directory authorities no long accept descriptors for any version of
  18097. Tor before 0.2.2.35, or for any 0.2.3 release before 0.2.3.10-alpha.
  18098. These versions are insecure, unsupported, or both. Implements
  18099. ticket 6789.
  18100. - When directory authorities are computing thresholds for flags,
  18101. never let the threshold for the Fast flag fall below 4096
  18102. bytes. Also, do not consider nodes with extremely low bandwidths
  18103. when deciding thresholds for various directory flags. This change
  18104. should raise our threshold for Fast relays, possibly in turn
  18105. improving overall network performance; see ticket 1854. Resolves
  18106. ticket 8145.
  18107. - Directory authorities now include inside each vote a statement of
  18108. the performance thresholds they used when assigning flags.
  18109. Implements ticket 8151.
  18110. - Add an "ignoring-advertised-bws" boolean to the flag-threshold lines
  18111. in directory authority votes to describe whether they have enough
  18112. measured bandwidths to ignore advertised (relay descriptor)
  18113. bandwidth claims. Resolves ticket 8711.
  18114. o Minor features (path bias detection):
  18115. - Path Use Bias: Perform separate accounting for successful circuit
  18116. use. Keep separate statistics on stream attempt rates versus stream
  18117. success rates for each guard. Provide configurable thresholds to
  18118. determine when to emit log messages or disable use of guards that
  18119. fail too many stream attempts. Resolves ticket 7802.
  18120. - Create three levels of Path Bias log messages, as opposed to just
  18121. two. These are configurable via consensus as well as via the torrc
  18122. options PathBiasNoticeRate, PathBiasWarnRate, PathBiasExtremeRate.
  18123. The default values are 0.70, 0.50, and 0.30 respectively.
  18124. - Separate the log message levels from the decision to drop guards,
  18125. which also is available via torrc option PathBiasDropGuards.
  18126. PathBiasDropGuards still defaults to 0 (off).
  18127. - Deprecate PathBiasDisableRate in favor of PathBiasDropGuards
  18128. in combination with PathBiasExtremeRate.
  18129. - Increase the default values for PathBiasScaleThreshold and
  18130. PathBiasCircThreshold from (200, 20) to (300, 150).
  18131. - Add in circuit usage accounting to path bias. If we try to use a
  18132. built circuit but fail for any reason, it counts as path bias.
  18133. Certain classes of circuits where the adversary gets to pick your
  18134. destination node are exempt from this accounting. Usage accounting
  18135. can be specifically disabled via consensus parameter or torrc.
  18136. - Convert all internal path bias state to double-precision floating
  18137. point, to avoid roundoff error and other issues.
  18138. - Only record path bias information for circuits that have completed
  18139. *two* hops. Assuming end-to-end tagging is the attack vector, this
  18140. makes us more resilient to ambient circuit failure without any
  18141. detection capability loss.
  18142. o Minor features (build):
  18143. - Tor now builds correctly on Bitrig, an OpenBSD fork. Patch from
  18144. dhill. Resolves ticket 6982.
  18145. - Compile on win64 using mingw64. Fixes bug 7260; patches from
  18146. "yayooo".
  18147. - Work correctly on Unix systems where EAGAIN and EWOULDBLOCK are
  18148. separate error codes; or at least, don't break for that reason.
  18149. Fixes bug 7935. Reported by "oftc_must_be_destroyed".
  18150. o Build improvements (autotools):
  18151. - Warn if building on a platform with an unsigned time_t: there
  18152. are too many places where Tor currently assumes that time_t can
  18153. hold negative values. We'd like to fix them all, but probably
  18154. some will remain.
  18155. - Do not report status verbosely from autogen.sh unless the -v flag
  18156. is specified. Fixes issue 4664. Patch from Onizuka.
  18157. - Detect and reject attempts to build Tor with threading support
  18158. when OpenSSL has been compiled without threading support.
  18159. Fixes bug 6673.
  18160. - Try to detect if we are ever building on a platform where
  18161. memset(...,0,...) does not set the value of a double to 0.0. Such
  18162. platforms are permitted by the C standard, though in practice
  18163. they're pretty rare (since IEEE 754 is nigh-ubiquitous). We don't
  18164. currently support them, but it's better to detect them and fail
  18165. than to perform erroneously.
  18166. - We no longer warn so much when generating manpages from their
  18167. asciidoc source.
  18168. - Use Ville Laurikari's implementation of AX_CHECK_SIGN() to determine
  18169. the signs of types during autoconf. This is better than our old
  18170. approach, which didn't work when cross-compiling.
  18171. o Minor features (log messages, warnings):
  18172. - Detect when we're running with a version of OpenSSL other than the
  18173. one we compiled with. This conflict has occasionally given people
  18174. hard-to-track-down errors.
  18175. - Warn users who run hidden services on a Tor client with
  18176. UseEntryGuards disabled that their hidden services will be
  18177. vulnerable to http://freehaven.net/anonbib/#hs-attack06 (the
  18178. attack which motivated Tor to support entry guards in the first
  18179. place). Resolves ticket 6889.
  18180. - Warn when we are binding low ports when hibernation is enabled;
  18181. previously we had warned when we were _advertising_ low ports with
  18182. hibernation enabled. Fixes bug 7285; bugfix on 0.2.3.9-alpha.
  18183. - Issue a warning when running with the bufferevents backend enabled.
  18184. It's still not stable, and people should know that they're likely
  18185. to hit unexpected problems. Closes ticket 9147.
  18186. o Minor features (log messages, notices):
  18187. - Refactor resolve_my_address() so it returns the method by which we
  18188. decided our public IP address (explicitly configured, resolved from
  18189. explicit hostname, guessed from interfaces, learned by gethostname).
  18190. Now we can provide more helpful log messages when a relay guesses
  18191. its IP address incorrectly (e.g. due to unexpected lines in
  18192. /etc/hosts). Resolves ticket 2267.
  18193. - Track how many "TAP" and "NTor" circuit handshake requests we get,
  18194. and how many we complete, and log it every hour to help relay
  18195. operators follow trends in network load. Addresses ticket 9658.
  18196. o Minor features (log messages, diagnostics):
  18197. - If we fail to free a microdescriptor because of bug 7164, log
  18198. the filename and line number from which we tried to free it.
  18199. - We compute the overhead from passing onionskins back and forth to
  18200. cpuworkers, and report it when dumping statistics in response to
  18201. SIGUSR1. Supports ticket 7291.
  18202. - Add another diagnostic to the heartbeat message: track and log
  18203. overhead that TLS is adding to the data we write. If this is
  18204. high, we are sending too little data to SSL_write at a time.
  18205. Diagnostic for bug 7707.
  18206. - Log packaged cell fullness as part of the heartbeat message.
  18207. Diagnosis to try to determine the extent of bug 7743.
  18208. - Add more detail to a log message about relaxed timeouts, to help
  18209. track bug 7799.
  18210. - When learning a fingerprint for a bridge, log its corresponding
  18211. transport type. Implements ticket 7896.
  18212. - Warn more aggressively when flushing microdescriptors to a
  18213. microdescriptor cache fails, in an attempt to mitigate bug 8031,
  18214. or at least make it more diagnosable.
  18215. - Improve the log message when "Bug/attack: unexpected sendme cell
  18216. from client" occurs, to help us track bug 8093.
  18217. - Improve debugging output to help track down bug 8185 ("Bug:
  18218. outgoing relay cell has n_chan==NULL. Dropping.")
  18219. o Minor features (log messages, quieter bootstrapping):
  18220. - Log fewer lines at level "notice" about our OpenSSL and Libevent
  18221. versions and capabilities when everything is going right. Resolves
  18222. part of ticket 6736.
  18223. - Omit the first heartbeat log message, because it never has anything
  18224. useful to say, and it clutters up the bootstrapping messages.
  18225. Resolves ticket 6758.
  18226. - Don't log about reloading the microdescriptor cache at startup. Our
  18227. bootstrap warnings are supposed to tell the user when there's a
  18228. problem, and our bootstrap notices say when there isn't. Resolves
  18229. ticket 6759; bugfix on 0.2.2.6-alpha.
  18230. - Don't log "I learned some more directory information" when we're
  18231. reading cached directory information. Reserve it for when new
  18232. directory information arrives in response to a fetch. Resolves
  18233. ticket 6760.
  18234. - Don't complain about bootstrapping problems while hibernating.
  18235. These complaints reflect a general code problem, but not one
  18236. with any problematic effects (no connections are actually
  18237. opened). Fixes part of bug 7302; bugfix on 0.2.3.2-alpha.
  18238. o Minor features (testing):
  18239. - In our testsuite, create temporary directories with a bit more
  18240. entropy in their name to make name collisions less likely. Fixes
  18241. bug 8638.
  18242. - Add benchmarks for DH (1024-bit multiplicative group) and ECDH
  18243. (P-256) Diffie-Hellman handshakes to src/or/bench.
  18244. - Add benchmark functions to test onion handshake performance.
  18245. o Renamed options:
  18246. - The DirServer option is now DirAuthority, for consistency with
  18247. current naming patterns. You can still use the old DirServer form.
  18248. o Minor bugfixes (protocol):
  18249. - Fix the handling of a TRUNCATE cell when it arrives while the
  18250. circuit extension is in progress. Fixes bug 7947; bugfix on 0.0.7.1.
  18251. - When a Tor client gets a "truncated" relay cell, the first byte of
  18252. its payload specifies why the circuit was truncated. We were
  18253. ignoring this 'reason' byte when tearing down the circuit, resulting
  18254. in the controller not being told why the circuit closed. Now we
  18255. pass the reason from the truncated cell to the controller. Bugfix
  18256. on 0.1.2.3-alpha; fixes bug 7039.
  18257. - Fix a misframing issue when reading the version numbers in a
  18258. VERSIONS cell. Previously we would recognize [00 01 00 02] as
  18259. 'version 1, version 2, and version 0x100', when it should have
  18260. only included versions 1 and 2. Fixes bug 8059; bugfix on
  18261. 0.2.0.10-alpha. Reported pseudonymously.
  18262. - Make the format and order of STREAM events for DNS lookups
  18263. consistent among the various ways to launch DNS lookups. Fixes
  18264. bug 8203; bugfix on 0.2.0.24-rc. Patch by "Desoxy".
  18265. o Minor bugfixes (syscalls and disk interaction):
  18266. - Always check the return values of functions fcntl() and
  18267. setsockopt(). We don't believe these are ever actually failing in
  18268. practice, but better safe than sorry. Also, checking these return
  18269. values should please analysis tools like Coverity. Patch from
  18270. 'flupzor'. Fixes bug 8206; bugfix on all versions of Tor.
  18271. - Avoid double-closing the listener socket in our socketpair()
  18272. replacement (used on Windows) in the case where the addresses on
  18273. our opened sockets don't match what we expected. Fixes bug 9400;
  18274. bugfix on 0.0.2pre7. Found by Coverity.
  18275. - Correctly store microdescriptors and extrainfo descriptors that
  18276. include an internal NUL byte. Fixes bug 8037; bugfix on
  18277. 0.2.0.1-alpha. Bug reported by "cypherpunks".
  18278. - If for some reason we fail to write a microdescriptor while
  18279. rebuilding the cache, do not let the annotations from that
  18280. microdescriptor linger in the cache file, and do not let the
  18281. microdescriptor stay recorded as present in its old location.
  18282. Fixes bug 9047; bugfix on 0.2.2.6-alpha.
  18283. - Use direct writes rather than stdio when building microdescriptor
  18284. caches, in an attempt to mitigate bug 8031, or at least make it
  18285. less common.
  18286. o Minor fixes (config options):
  18287. - Warn and fail if a server is configured not to advertise any
  18288. ORPorts at all. (We need *something* to put in our descriptor,
  18289. or we just won't work.)
  18290. - Behave correctly when the user disables LearnCircuitBuildTimeout
  18291. but doesn't tell us what they would like the timeout to be. Fixes
  18292. bug 6304; bugfix on 0.2.2.14-alpha.
  18293. - Rename the (internal-use-only) UsingTestingNetworkDefaults option
  18294. to start with a triple-underscore so the controller won't touch it.
  18295. Patch by Meejah. Fixes bug 3155. Bugfix on 0.2.2.23-alpha.
  18296. - Rename the (testing-use-only) _UseFilteringSSLBufferevents option
  18297. so it doesn't start with _. Fixes bug 3155. Bugfix on 0.2.3.1-alpha.
  18298. - When autodetecting the number of CPUs, use the number of available
  18299. CPUs in preference to the number of configured CPUs. Inform the
  18300. user if this reduces the number of available CPUs. Fixes bug 8002;
  18301. bugfix on 0.2.3.1-alpha.
  18302. - Command-line option "--version" implies "--quiet". Fixes bug 6997.
  18303. - Make it an error when you set EntryNodes but disable UseGuardNodes,
  18304. since it will (surprisingly to some users) ignore EntryNodes. Fixes
  18305. bug 8180; bugfix on 0.2.3.11-alpha.
  18306. - Avoid overflows when the user sets MaxCircuitDirtiness to a
  18307. ridiculously high value, by imposing a (ridiculously high) 30-day
  18308. maximum on MaxCircuitDirtiness.
  18309. o Minor bugfixes (control protocol):
  18310. - Stop sending a stray "(null)" in some cases for the server status
  18311. "EXTERNAL_ADDRESS" controller event. Resolves bug 8200; bugfix
  18312. on 0.1.2.6-alpha.
  18313. - The ADDRMAP command can no longer generate an ill-formed error
  18314. code on a failed MAPADDRESS. It now says "internal" rather than
  18315. an English sentence fragment with spaces in the middle. Bugfix on
  18316. Tor 0.2.0.19-alpha.
  18317. o Minor bugfixes (clients / edges):
  18318. - When we receive a RELAY_END cell with the reason DONE, or with no
  18319. reason, before receiving a RELAY_CONNECTED cell, report the SOCKS
  18320. status as "connection refused". Previously we reported these cases
  18321. as success but then immediately closed the connection. Fixes bug
  18322. 7902; bugfix on 0.1.0.1-rc. Reported by "oftc_must_be_destroyed".
  18323. - If the guard we choose first doesn't answer, we would try the
  18324. second guard, but once we connected to the second guard we would
  18325. abandon it and retry the first one, slowing down bootstrapping.
  18326. The fix is to treat all our initially chosen guards as acceptable
  18327. to use. Fixes bug 9946; bugfix on 0.1.1.11-alpha.
  18328. - When choosing which stream on a formerly stalled circuit to wake
  18329. first, make better use of the platform's weak RNG. Previously,
  18330. we had been using the % ("modulo") operator to try to generate a
  18331. 1/N chance of picking each stream, but this behaves badly with
  18332. many platforms' choice of weak RNG. Fixes bug 7801; bugfix on
  18333. 0.2.2.20-alpha.
  18334. o Minor bugfixes (path bias detection):
  18335. - If the state file's path bias counts are invalid (presumably from a
  18336. buggy Tor prior to 0.2.4.10-alpha), make them correct. Also add
  18337. additional checks and log messages to the scaling of Path Bias
  18338. counts, in case there still are remaining issues with scaling.
  18339. Should help resolve bug 8235.
  18340. - Prevent rounding error in path bias counts when scaling
  18341. them down, and use the correct scale factor default. Also demote
  18342. some path bias related log messages down a level and make others
  18343. less scary sounding. Fixes bug 6647. Bugfix on 0.2.3.17-beta.
  18344. - Remove a source of rounding error during path bias count scaling;
  18345. don't count cannibalized circuits as used for path bias until we
  18346. actually try to use them; and fix a circuit_package_relay_cell()
  18347. warning message about n_chan==NULL. Fixes bug 7802.
  18348. - Paste the description for PathBias parameters from the man
  18349. page into or.h, so the code documents them too. Fixes bug 7982;
  18350. bugfix on 0.2.3.17-beta.
  18351. o Minor bugfixes (relays):
  18352. - Stop trying to resolve our hostname so often (e.g. every time we
  18353. think about doing a directory fetch). Now we reuse the cached
  18354. answer in some cases. Fixes bugs 1992 (bugfix on 0.2.0.20-rc)
  18355. and 2410 (bugfix on 0.1.2.2-alpha).
  18356. - When examining the list of network interfaces to find our address,
  18357. do not consider non-running or disabled network interfaces. Fixes
  18358. bug 9904; bugfix on 0.2.3.11-alpha. Patch from "hantwister".
  18359. o Minor bugfixes (blocking resistance):
  18360. - Only disable TLS session ticket support when running as a TLS
  18361. server. Now clients will blend better with regular Firefox
  18362. connections. Fixes bug 7189; bugfix on Tor 0.2.3.23-rc.
  18363. o Minor bugfixes (IPv6):
  18364. - Use square brackets around IPv6 addresses in numerous places
  18365. that needed them, including log messages, HTTPS CONNECT proxy
  18366. requests, TransportProxy statefile entries, and pluggable transport
  18367. extra-info lines. Fixes bug 7011; patch by David Fifield.
  18368. o Minor bugfixes (directory authorities):
  18369. - Reject consensus votes with more than 64 known-flags. We aren't even
  18370. close to that limit yet, and our code doesn't handle it correctly.
  18371. Fixes bug 6833; bugfix on 0.2.0.1-alpha.
  18372. - Correctly handle votes with more than 31 flags. Fixes bug 6853;
  18373. bugfix on 0.2.0.3-alpha.
  18374. o Minor bugfixes (memory leaks):
  18375. - Avoid leaking memory if we fail to compute a consensus signature
  18376. or we generate a consensus we can't parse. Bugfix on 0.2.0.5-alpha.
  18377. - Fix a memory leak when receiving headers from an HTTPS proxy. Bugfix
  18378. on 0.2.1.1-alpha; fixes bug 7816.
  18379. - Fix a memory leak during safe-cookie controller authentication.
  18380. Bugfix on 0.2.3.13-alpha; fixes bug 7816.
  18381. - Free some more still-in-use memory at exit, to make hunting for
  18382. memory leaks easier. Resolves bug 7029.
  18383. o Minor bugfixes (code correctness):
  18384. - Increase the width of the field used to remember a connection's
  18385. link protocol version to two bytes. Harmless for now, since the
  18386. only currently recognized versions are one byte long. Reported
  18387. pseudonymously. Fixes bug 8062; bugfix on 0.2.0.10-alpha.
  18388. - Fix a crash when debugging unit tests on Windows: deallocate a
  18389. shared library with FreeLibrary, not CloseHandle. Fixes bug 7306;
  18390. bugfix on 0.2.2.17-alpha. Reported by "ultramage".
  18391. - When detecting the largest possible file descriptor (in order to
  18392. close all file descriptors when launching a new program), actually
  18393. use _SC_OPEN_MAX. The old code for doing this was very, very broken.
  18394. Fixes bug 8209; bugfix on 0.2.3.1-alpha. Found by Coverity; this
  18395. is CID 743383.
  18396. - Avoid a crash if we fail to generate an extrainfo descriptor.
  18397. Fixes bug 8208; bugfix on 0.2.3.16-alpha. Found by Coverity;
  18398. this is CID 718634.
  18399. - Avoid an off-by-one error when checking buffer boundaries when
  18400. formatting the exit status of a pluggable transport helper.
  18401. This is probably not an exploitable bug, but better safe than
  18402. sorry. Fixes bug 9928; bugfix on 0.2.3.18-rc. Bug found by
  18403. Pedro Ribeiro.
  18404. - Get rid of a couple of harmless clang warnings, where we compared
  18405. enums to ints. These warnings are newly introduced in clang 3.2.
  18406. o Minor bugfixes (code cleanliness):
  18407. - Avoid use of reserved identifiers in our C code. The C standard
  18408. doesn't like us declaring anything that starts with an
  18409. underscore, so let's knock it off before we get in trouble. Fix
  18410. for bug 1031; bugfix on the first Tor commit.
  18411. - Fix round_to_power_of_2() so it doesn't invoke undefined behavior
  18412. with large values. This situation was untriggered, but nevertheless
  18413. incorrect. Fixes bug 6831; bugfix on 0.2.0.1-alpha.
  18414. - Fix an impossible buffer overrun in the AES unit tests. Fixes
  18415. bug 8845; bugfix on 0.2.0.7-alpha. Found by eugenis.
  18416. - Fix handling of rendezvous client authorization types over 8.
  18417. Fixes bug 6861; bugfix on 0.2.1.5-alpha.
  18418. - Remove a couple of extraneous semicolons that were upsetting the
  18419. cparser library. Patch by Christian Grothoff. Fixes bug 7115;
  18420. bugfix on 0.2.2.1-alpha.
  18421. - When complaining about a client port on a public address, log
  18422. which address we're complaining about. Fixes bug 4020; bugfix on
  18423. 0.2.3.3-alpha. Patch by Tom Fitzhenry.
  18424. o Minor bugfixes (log messages, warnings):
  18425. - If we encounter a write failure on a SOCKS connection before we
  18426. finish our SOCKS handshake, don't warn that we closed the
  18427. connection before we could send a SOCKS reply. Fixes bug 8427;
  18428. bugfix on 0.1.0.1-rc.
  18429. - Fix a directory authority warn caused when we have a large amount
  18430. of badexit bandwidth. Fixes bug 8419; bugfix on 0.2.2.10-alpha.
  18431. - Downgrade "Failed to hand off onionskin" messages to "debug"
  18432. severity, since they're typically redundant with the "Your computer
  18433. is too slow" messages. Fixes bug 7038; bugfix on 0.2.2.16-alpha.
  18434. - Avoid spurious warnings when configuring multiple client ports of
  18435. which only some are nonlocal. Previously, we had claimed that some
  18436. were nonlocal when in fact they weren't. Fixes bug 7836; bugfix on
  18437. 0.2.3.3-alpha.
  18438. o Minor bugfixes (log messages, other):
  18439. - Fix log messages and comments to avoid saying "GMT" when we mean
  18440. "UTC". Fixes bug 6113.
  18441. - When rejecting a configuration because we were unable to parse a
  18442. quoted string, log an actual error message. Fixes bug 7950; bugfix
  18443. on 0.2.0.16-alpha.
  18444. - Correctly recognize that [::1] is a loopback address. Fixes
  18445. bug 8377; bugfix on 0.2.1.3-alpha.
  18446. - Don't log inappropriate heartbeat messages when hibernating: a
  18447. hibernating node is _expected_ to drop out of the consensus,
  18448. decide it isn't bootstrapped, and so forth. Fixes bug 7302;
  18449. bugfix on 0.2.3.1-alpha.
  18450. - Eliminate several instances where we use "Nickname=ID" to refer to
  18451. nodes in logs. Use "Nickname (ID)" instead. (Elsewhere, we still use
  18452. "$ID=Nickname", which is also acceptable.) Fixes bug 7065. Bugfix
  18453. on 0.2.3.21-rc.
  18454. o Minor bugfixes (build):
  18455. - Fix some bugs in tor-fw-helper-natpmp when trying to build and
  18456. run it on Windows. More bugs likely remain. Patch from Gisle Vanem.
  18457. Fixes bug 7280; bugfix on 0.2.3.1-alpha.
  18458. o Documentation fixes:
  18459. - Make the torify manpage no longer refer to tsocks; torify hasn't
  18460. supported tsocks since 0.2.3.14-alpha.
  18461. - Make the tor manpage no longer reference tsocks.
  18462. - Fix the GeoIPExcludeUnknown documentation to refer to
  18463. ExcludeExitNodes rather than the currently nonexistent
  18464. ExcludeEntryNodes. Spotted by "hamahangi" on tor-talk.
  18465. - Resolve a typo in torrc.sample.in. Fixes bug 6819; bugfix on
  18466. 0.2.3.14-alpha.
  18467. - Say "KBytes" rather than "KB" in the man page (for various values
  18468. of K), to further reduce confusion about whether Tor counts in
  18469. units of memory or fractions of units of memory. Resolves ticket 7054.
  18470. - Update tor-fw-helper.1.txt and tor-fw-helper.c to make option
  18471. names match. Fixes bug 7768.
  18472. - Fix the documentation of HeartbeatPeriod to say that the heartbeat
  18473. message is logged at notice, not at info.
  18474. - Clarify the usage and risks of setting the ContactInfo torrc line
  18475. for your relay or bridge. Resolves ticket 9854.
  18476. - Add anchors to the manpage so we can link to the html version of
  18477. the documentation for specific options. Resolves ticket 9866.
  18478. - Replace remaining references to DirServer in man page and
  18479. log entries. Resolves ticket 10124.
  18480. o Removed features:
  18481. - Stop exporting estimates of v2 and v3 directory traffic shares
  18482. in extrainfo documents. They were unneeded and sometimes inaccurate.
  18483. Also stop exporting any v2 directory request statistics. Resolves
  18484. ticket 5823.
  18485. - Drop support for detecting and warning about versions of Libevent
  18486. before 1.3e. Nothing reasonable ships with them any longer; warning
  18487. the user about them shouldn't be needed. Resolves ticket 6826.
  18488. - Now that all versions before 0.2.2.x are disallowed, we no longer
  18489. need to work around their missing features. Remove a bunch of
  18490. compatibility code.
  18491. o Removed files:
  18492. - The tor-tsocks.conf is no longer distributed or installed. We
  18493. recommend that tsocks users use torsocks instead. Resolves
  18494. ticket 8290.
  18495. - Remove some of the older contents of doc/ as obsolete; move others
  18496. to torspec.git. Fixes bug 8965.
  18497. o Code simplification:
  18498. - Avoid using character buffers when constructing most directory
  18499. objects: this approach was unwieldy and error-prone. Instead,
  18500. build smartlists of strings, and concatenate them when done.
  18501. - Rename "isin" functions to "contains", for grammar. Resolves
  18502. ticket 5285.
  18503. - Rename Tor's logging function log() to tor_log(), to avoid conflicts
  18504. with the natural logarithm function from the system libm. Resolves
  18505. ticket 7599.
  18506. - Start using OpenBSD's implementation of queue.h, so that we don't
  18507. need to hand-roll our own pointer and list structures whenever we
  18508. need them. (We can't rely on a sys/queue.h, since some operating
  18509. systems don't have them, and the ones that do have them don't all
  18510. present the same extensions.)
  18511. - Start using OpenBSD's implementation of queue.h (originally by
  18512. Niels Provos).
  18513. - Enhance our internal sscanf replacement so that we can eliminate
  18514. the last remaining uses of the system sscanf. (Though those uses
  18515. of sscanf were safe, sscanf itself is generally error prone, so
  18516. we want to eliminate when we can.) Fixes ticket 4195 and Coverity
  18517. CID 448.
  18518. - Replace all calls to snprintf() outside of src/ext with
  18519. tor_snprintf(). Also remove the #define to replace snprintf with
  18520. _snprintf on Windows; they have different semantics, and all of
  18521. our callers should be using tor_snprintf() anyway. Fixes bug 7304.
  18522. o Refactoring:
  18523. - Add a wrapper function for the common "log a message with a
  18524. rate-limit" case.
  18525. - Split the onion.c file into separate modules for the onion queue
  18526. and the different handshakes it supports.
  18527. - Move the client-side address-map/virtual-address/DNS-cache code
  18528. out of connection_edge.c into a new addressmap.c module.
  18529. - Move the entry node code from circuitbuild.c to its own file.
  18530. - Move the circuit build timeout tracking code from circuitbuild.c
  18531. to its own file.
  18532. - Source files taken from other packages now reside in src/ext;
  18533. previously they were scattered around the rest of Tor.
  18534. - Move the generic "config" code into a new file, and have "config.c"
  18535. hold only torrc- and state-related code. Resolves ticket 6823.
  18536. - Move the core of our "choose a weighted element at random" logic
  18537. into its own function, and give it unit tests. Now the logic is
  18538. testable, and a little less fragile too.
  18539. - Move ipv6_preferred from routerinfo_t to node_t. Addresses bug 4620.
  18540. - Move last_reachable and testing_since from routerinfo_t to node_t.
  18541. Implements ticket 5529.
  18542. - Add replaycache_t structure, functions and unit tests, then refactor
  18543. rend_service_introduce() to be more clear to read, improve, debug,
  18544. and test. Resolves bug 6177.
  18545. o Removed code:
  18546. - Remove some now-needless code that tried to aggressively flush
  18547. OR connections as data was added to them. Since 0.2.0.1-alpha, our
  18548. cell queue logic has saved us from the failure mode that this code
  18549. was supposed to prevent. Removing this code will limit the number
  18550. of baroque control flow paths through Tor's network logic. Reported
  18551. pseudonymously on IRC. Fixes bug 6468; bugfix on 0.2.0.1-alpha.
  18552. - Remove unused code for parsing v1 directories and "running routers"
  18553. documents. Fixes bug 6887.
  18554. - Remove the marshalling/unmarshalling code for sending requests to
  18555. cpuworkers over a socket, and instead just send structs. The
  18556. recipient will always be the same Tor binary as the sender, so
  18557. any encoding is overkill.
  18558. - Remove the testing_since field of node_t, which hasn't been used
  18559. for anything since 0.2.0.9-alpha.
  18560. - Finally remove support for malloc_good_size and malloc_usable_size.
  18561. We had hoped that these functions would let us eke a little more
  18562. memory out of our malloc implementation. Unfortunately, the only
  18563. implementations that provided these functions are also ones that
  18564. are already efficient about not overallocation: they never got us
  18565. more than 7 or so bytes per allocation. Removing them saves us a
  18566. little code complexity and a nontrivial amount of build complexity.
  18567. Changes in version 0.2.3.25 - 2012-11-19
  18568. The Tor 0.2.3 release series is dedicated to the memory of Len "rabbi"
  18569. Sassaman (1980-2011), a long-time cypherpunk, anonymity researcher,
  18570. Mixmaster maintainer, Pynchon Gate co-designer, CodeCon organizer,
  18571. programmer, and friend. Unstinting in his dedication to the cause of
  18572. freedom, he inspired and helped many of us as we began our work on
  18573. anonymity, and inspires us still. Please honor his memory by writing
  18574. software to protect people's freedoms, and by helping others to do so.
  18575. Tor 0.2.3.25, the first stable release in the 0.2.3 branch, features
  18576. significantly reduced directory overhead (via microdescriptors),
  18577. enormous crypto performance improvements for fast relays on new
  18578. enough hardware, a new v3 TLS handshake protocol that can better
  18579. resist fingerprinting, support for protocol obfuscation plugins (aka
  18580. pluggable transports), better scalability for hidden services, IPv6
  18581. support for bridges, performance improvements like allowing clients
  18582. to skip the first round-trip on the circuit ("optimistic data") and
  18583. refilling token buckets more often, a new "stream isolation" design
  18584. to isolate different applications on different circuits, and many
  18585. stability, security, and privacy fixes.
  18586. Major features (v3 directory protocol):
  18587. - Clients now use microdescriptors instead of regular descriptors
  18588. to build circuits. Microdescriptors are authority-generated
  18589. summaries of regular descriptors' contents, designed to change very
  18590. rarely (see proposal 158 for details). This feature is designed
  18591. to save bandwidth, especially for clients on slow internet
  18592. connections. Use "UseMicrodescriptors 0" to disable it.
  18593. - Caches now download, cache, and serve microdescriptors, as well
  18594. as multiple "flavors" of the consensus, including a flavor that
  18595. describes microdescriptors.
  18596. o Major features (build hardening):
  18597. - Enable gcc and ld hardening by default. Resolves ticket 5210.
  18598. o Major features (relay scaling):
  18599. - When built to use OpenSSL 1.0.1, and built for an x86 or x86_64
  18600. instruction set, take advantage of OpenSSL's AESNI, bitsliced, or
  18601. vectorized AES implementations as appropriate. These can be much,
  18602. much faster than other AES implementations.
  18603. - When using OpenSSL 1.0.0 or later, use OpenSSL's counter mode
  18604. implementation. It makes AES_CTR about 7% faster than our old one
  18605. (which was about 10% faster than the one OpenSSL used to provide).
  18606. Resolves ticket 4526.
  18607. - Use OpenSSL's EVP interface for AES encryption, so that all AES
  18608. operations can use hardware acceleration (if present). Resolves
  18609. ticket 4442.
  18610. - Unconditionally use OpenSSL's AES implementation instead of our
  18611. old built-in one. OpenSSL's AES has been better for a while, and
  18612. relatively few servers should still be on any version of OpenSSL
  18613. that doesn't have good optimized assembly AES.
  18614. o Major features (blocking resistance):
  18615. - Update TLS cipher list to match Firefox 8 and later. Resolves
  18616. ticket 4744.
  18617. - Remove support for clients falsely claiming to support standard
  18618. ciphersuites that they can actually provide. As of modern OpenSSL
  18619. versions, it's not necessary to fake any standard ciphersuite,
  18620. and doing so prevents us from using better ciphersuites in the
  18621. future, since servers can't know whether an advertised ciphersuite
  18622. is really supported or not. Some hosts -- notably, ones with very
  18623. old versions of OpenSSL or where OpenSSL has been built with ECC
  18624. disabled -- will stand out because of this change; TBB users should
  18625. not be affected. Implements the client side of proposal 198.
  18626. - Implement a new handshake protocol (v3) for authenticating Tors to
  18627. each other over TLS. It should be more resistant to fingerprinting
  18628. than previous protocols, and should require less TLS hacking for
  18629. future Tor implementations. Implements proposal 176.
  18630. - Allow variable-length padding cells, to disguise the length of
  18631. Tor's TLS records. Implements part of proposal 184.
  18632. - While we're trying to bootstrap, record how many TLS connections
  18633. fail in each state, and report which states saw the most failures
  18634. in response to any bootstrap failures. This feature may speed up
  18635. diagnosis of censorship events. Implements ticket 3116.
  18636. o Major features (pluggable transports):
  18637. - Clients and bridges can now be configured to use a separate
  18638. "transport" proxy. This approach makes the censorship arms race
  18639. easier by allowing bridges to use protocol obfuscation plugins.
  18640. Implements proposal 180 (tickets 2841 and 3472).
  18641. o Major features (DoS resistance):
  18642. - Now that Tor 0.2.0.x is completely deprecated, enable the final
  18643. part of "Proposal 110: Avoiding infinite length circuits" by
  18644. refusing all circuit-extend requests that do not use a relay_early
  18645. cell. This change helps Tor resist a class of denial-of-service
  18646. attacks by limiting the maximum circuit length.
  18647. - Tear down the circuit if we get an unexpected SENDME cell. Clients
  18648. could use this trick to make their circuits receive cells faster
  18649. than our flow control would have allowed, or to gum up the network,
  18650. or possibly to do targeted memory denial-of-service attacks on
  18651. entry nodes. Fixes bug 6252. Bugfix on the 54th commit on Tor --
  18652. from July 2002, before the release of Tor 0.0.0.
  18653. o Major features (hidden services):
  18654. - Adjust the number of introduction points that a hidden service
  18655. will try to maintain based on how long its introduction points
  18656. remain in use and how many introductions they handle. Fixes
  18657. part of bug 3825.
  18658. - Add a "tor2web mode" for clients that want to connect to hidden
  18659. services non-anonymously (and possibly more quickly). As a safety
  18660. measure to try to keep users from turning this on without knowing
  18661. what they are doing, tor2web mode must be explicitly enabled at
  18662. compile time, and a copy of Tor compiled to run in tor2web mode
  18663. cannot be used as a normal Tor client. Implements feature 2553.
  18664. o Major features (IPv6):
  18665. - Clients can now connect to private bridges over IPv6. Bridges
  18666. still need at least one IPv4 address in order to connect to
  18667. other relays. Note that we don't yet handle the case where the
  18668. user has two bridge lines for the same bridge (one IPv4, one
  18669. IPv6). Implements parts of proposal 186.
  18670. o Major features (directory authorities):
  18671. - Use a more secure consensus parameter voting algorithm. Now at
  18672. least three directory authorities or a majority of them must
  18673. vote on a given parameter before it will be included in the
  18674. consensus. Implements proposal 178.
  18675. - Remove the artificially low cutoff of 20KB to guarantee the Fast
  18676. flag. In the past few years the average relay speed has picked
  18677. up, and while the "top 7/8 of the network get the Fast flag" and
  18678. "all relays with 20KB or more of capacity get the Fast flag" rules
  18679. used to have the same result, now the top 7/8 of the network has
  18680. a capacity more like 32KB. Bugfix on 0.2.1.14-rc. Fixes bug 4489.
  18681. o Major features (performance):
  18682. - Exit nodes now accept and queue data on not-yet-connected streams.
  18683. Previously, the client wasn't allowed to send data until the
  18684. stream was connected, which slowed down all connections. This
  18685. change will enable clients to perform a "fast-start" on streams
  18686. and send data without having to wait for a confirmation that the
  18687. stream has opened. Patch from Ian Goldberg; implements the server
  18688. side of Proposal 174.
  18689. - When using an exit relay running 0.2.3.x, clients can now
  18690. "optimistically" send data before the exit relay reports that
  18691. the stream has opened. This saves a round trip when starting
  18692. connections where the client speaks first (such as web browsing).
  18693. This behavior is controlled by a consensus parameter (currently
  18694. disabled). To turn it on or off manually, use the "OptimisticData"
  18695. torrc option. Implements proposal 181; code by Ian Goldberg.
  18696. - Add a new TokenBucketRefillInterval option to refill token buckets
  18697. more frequently than once per second. This should improve network
  18698. performance, alleviate queueing problems, and make traffic less
  18699. bursty. Implements proposal 183; closes ticket 3630. Design by
  18700. Florian Tschorsch and Björn Scheuermann; implementation by
  18701. Florian Tschorsch.
  18702. - Raise the threshold of server descriptors needed (75%) and exit
  18703. server descriptors needed (50%) before we will declare ourselves
  18704. bootstrapped. This will make clients start building circuits a
  18705. little later, but makes the initially constructed circuits less
  18706. skewed and less in conflict with further directory fetches. Fixes
  18707. ticket 3196.
  18708. o Major features (relays):
  18709. - Relays now try regenerating and uploading their descriptor more
  18710. frequently if they are not listed in the consensus, or if the
  18711. version of their descriptor listed in the consensus is too
  18712. old. This fix should prevent situations where a server declines
  18713. to re-publish itself because it has done so too recently, even
  18714. though the authorities decided not to list its recent-enough
  18715. descriptor. Fix for bug 3327.
  18716. o Major features (stream isolation):
  18717. - You can now configure Tor so that streams from different
  18718. applications are isolated on different circuits, to prevent an
  18719. attacker who sees your streams as they leave an exit node from
  18720. linking your sessions to one another. To do this, choose some way
  18721. to distinguish the applications: have them connect to different
  18722. SocksPorts, or have one of them use SOCKS4 while the other uses
  18723. SOCKS5, or have them pass different authentication strings to the
  18724. SOCKS proxy. Then, use the new SocksPort syntax to configure the
  18725. degree of isolation you need. This implements Proposal 171.
  18726. - There's a new syntax for specifying multiple client ports (such as
  18727. SOCKSPort, TransPort, DNSPort, NATDPort): you can now just declare
  18728. multiple *Port entries with full addr:port syntax on each.
  18729. The old *ListenAddress format is still supported, but you can't
  18730. mix it with the new *Port syntax.
  18731. o Major features (bufferevents):
  18732. - Tor can now optionally build with the "bufferevents" buffered IO
  18733. backend provided by Libevent 2. To use this feature, make sure you
  18734. have the latest possible version of Libevent, and pass the
  18735. --enable-bufferevents flag to configure when building Tor from
  18736. source. This feature will make our networking code more flexible,
  18737. let us stack layers on each other, and let us use more efficient
  18738. zero-copy transports where available.
  18739. - Add experimental support for running on Windows with IOCP and no
  18740. kernel-space socket buffers. This feature is controlled by a new
  18741. "UserspaceIOCPBuffers" config option (off by default), which has
  18742. no effect unless Tor has been built with bufferevents enabled,
  18743. you're running on Windows, and you've set "DisableIOCP 0". In the
  18744. long run, this may help solve or mitigate bug 98.
  18745. o Major features (path selection):
  18746. - The EntryNodes option can now include country codes like {de} or IP
  18747. addresses or network masks. Previously we had disallowed these
  18748. options because we didn't have an efficient way to keep the list up
  18749. to date. Addresses ticket 1982, but see bug 2798 for an unresolved
  18750. issue here.
  18751. o Major features (port forwarding):
  18752. - Add support for automatic port mapping on the many home routers
  18753. that support NAT-PMP or UPnP. To build the support code, you'll
  18754. need to have the libnatpnp library and/or the libminiupnpc library,
  18755. and you'll need to enable the feature specifically by passing
  18756. "--enable-upnp" and/or "--enable-natpnp" to ./configure. To turn
  18757. it on, use the new PortForwarding option.
  18758. o Major features (logging):
  18759. - Add a new 'Heartbeat' log message type to periodically log a message
  18760. describing Tor's status at level Notice. This feature is meant for
  18761. operators who log at notice, and want to make sure that their Tor
  18762. server is still working. Implementation by George Kadianakis.
  18763. - Make logging resolution configurable with a new LogTimeGranularity
  18764. option, and change the default from 1 millisecond to 1 second.
  18765. Implements enhancement 1668.
  18766. o Major features (other):
  18767. - New "DisableNetwork" config option to prevent Tor from launching any
  18768. connections or accepting any connections except on a control port.
  18769. Bundles and controllers can set this option before letting Tor talk
  18770. to the rest of the network, for example to prevent any connections
  18771. to a non-bridge address. Packages like Orbot can also use this
  18772. option to instruct Tor to save power when the network is off.
  18773. - Try to use system facilities for enumerating local interface
  18774. addresses, before falling back to our old approach (which was
  18775. binding a UDP socket, and calling getsockname() on it). That
  18776. approach was scaring OS X users whose draconian firewall
  18777. software warned about binding to UDP sockets regardless of
  18778. whether packets were sent. Now we try to use getifaddrs(),
  18779. SIOCGIFCONF, or GetAdaptersAddresses(), depending on what the
  18780. system supports. Resolves ticket 1827.
  18781. - Add experimental support for a "defaults" torrc file to be parsed
  18782. before the regular torrc. Torrc options override the defaults file's
  18783. options in the same way that the command line overrides the torrc.
  18784. The SAVECONF controller command saves only those options which
  18785. differ between the current configuration and the defaults file. HUP
  18786. reloads both files. Implements task 4552.
  18787. o New directory authorities:
  18788. - Add Faravahar (run by Sina Rabbani) as the ninth v3 directory
  18789. authority. Closes ticket 5749.
  18790. o Security/privacy fixes:
  18791. - Avoid read-from-freed-memory and double-free bugs that could occur
  18792. when a DNS request fails while launching it. Fixes bug 6480;
  18793. bugfix on 0.2.0.1-alpha.
  18794. - Reject any attempt to extend to an internal address. Without
  18795. this fix, a router could be used to probe addresses on an internal
  18796. network to see whether they were accepting connections. Fixes bug
  18797. 6710; bugfix on 0.0.8pre1.
  18798. - Close any connection that sends unrecognized junk before the TLS
  18799. handshake. Solves an issue noted in bug 4369.
  18800. - The advertised platform of a relay now includes only its operating
  18801. system's name (e.g., "Linux", "Darwin", "Windows 7"), and not
  18802. its service pack level (for Windows) or its CPU architecture
  18803. (for Unix). Also drop the "git-XYZ" tag in the version. Packagers
  18804. can insert an extra string in the platform line by setting the
  18805. preprocessor variable TOR_BUILD_TAG. Resolves bug 2988.
  18806. - Disable TLS session tickets. OpenSSL's implementation was giving
  18807. our TLS session keys the lifetime of our TLS context objects, when
  18808. perfect forward secrecy would want us to discard anything that
  18809. could decrypt a link connection as soon as the link connection
  18810. was closed. Fixes bug 7139; bugfix on all versions of Tor linked
  18811. against OpenSSL 1.0.0 or later. Found by Florent Daignière.
  18812. - Tor tries to wipe potentially sensitive data after using it, so
  18813. that if some subsequent security failure exposes Tor's memory,
  18814. the damage will be limited. But we had a bug where the compiler
  18815. was eliminating these wipe operations when it decided that the
  18816. memory was no longer visible to a (correctly running) program,
  18817. hence defeating our attempt at defense in depth. We fix that
  18818. by using OpenSSL's OPENSSL_cleanse() operation, which a compiler
  18819. is unlikely to optimize away. Future versions of Tor may use
  18820. a less ridiculously heavy approach for this. Fixes bug 7352.
  18821. Reported in an article by Andrey Karpov.
  18822. o Major bugfixes (crashes and asserts):
  18823. - Avoid a pair of double-free and use-after-mark bugs that can
  18824. occur with certain timings in canceled and re-received DNS
  18825. requests. Fixes bug 6472; bugfix on 0.0.7rc1.
  18826. - Fix a denial of service attack by which any directory authority
  18827. could crash all the others, or by which a single v2 directory
  18828. authority could crash everybody downloading v2 directory
  18829. information. Fixes bug 7191; bugfix on 0.2.0.10-alpha.
  18830. - Fix an assert that directory authorities could trigger on sighup
  18831. during some configuration state transitions. We now don't treat
  18832. it as a fatal error when the new descriptor we just generated in
  18833. init_keys() isn't accepted. Fixes bug 4438; bugfix on 0.2.1.9-alpha.
  18834. - Avoid segfault when starting up having run with an extremely old
  18835. version of Tor and parsing its state file. Fixes bug 6801; bugfix
  18836. on 0.2.2.23-alpha.
  18837. o Major bugfixes (clients):
  18838. - If we are unable to find any exit that supports our predicted ports,
  18839. stop calling them predicted, so that we don't loop and build
  18840. hopeless circuits indefinitely. Fixes bug 3296; bugfix on 0.0.9pre6,
  18841. which introduced predicted ports.
  18842. - Check at each new consensus whether our entry guards were picked
  18843. long enough ago that we should rotate them. Previously, we only
  18844. did this check at startup, which could lead to us holding a guard
  18845. indefinitely. Fixes bug 5380; bugfix on 0.2.1.14-rc.
  18846. - When fetching a bridge descriptor from a bridge authority,
  18847. always do so anonymously, whether we have been able to open
  18848. circuits or not. Partial fix for bug 1938; bugfix on 0.2.0.7-alpha.
  18849. This behavior makes it *safer* to use UpdateBridgesFromAuthority,
  18850. but we'll need to wait for bug 6010 before it's actually usable.
  18851. o Major bugfixes (directory voting):
  18852. - Check more thoroughly to prevent a rogue authority from
  18853. double-voting on any consensus directory parameter. Previously,
  18854. authorities would crash in this case if the total number of
  18855. votes for any parameter exceeded the number of active voters,
  18856. but would let it pass otherwise. Partially fixes bug 5786; bugfix
  18857. on 0.2.2.2-alpha.
  18858. - When computing weight parameters, behave more robustly in the
  18859. presence of a bad bwweightscale value. Previously, the authorities
  18860. would crash if they agreed on a sufficiently broken weight_scale
  18861. value; now, they use a reasonable default and carry on. Fixes the
  18862. rest of bug 5786; bugfix on 0.2.2.17-alpha.
  18863. - If authorities are unable to get a v2 consensus document from other
  18864. directory authorities, they no longer fall back to fetching
  18865. them from regular directory caches. Fixes bug 5635; bugfix on
  18866. 0.2.2.26-beta, where routers stopped downloading v2 consensus
  18867. documents entirely.
  18868. o Major bugfixes (relays):
  18869. - Fix a bug handling SENDME cells on nonexistent streams that could
  18870. result in bizarre window values. Report and patch contributed
  18871. pseudonymously. Fixes part of bug 6271. This bug was introduced
  18872. before the first Tor release, in svn commit r152.
  18873. - Don't update the AccountingSoftLimitHitAt state file entry whenever
  18874. tor gets started. This prevents a wrong average bandwidth
  18875. estimate, which would cause relays to always start a new accounting
  18876. interval at the earliest possible moment. Fixes bug 2003; bugfix
  18877. on 0.2.2.7-alpha. Reported by Bryon Eldridge, who also helped
  18878. immensely in tracking this bug down.
  18879. - Fix a possible crash bug when checking for deactivated circuits
  18880. in connection_or_flush_from_first_active_circuit(). Fixes bug 6341;
  18881. bugfix on 0.2.2.7-alpha. Bug report and fix received pseudonymously.
  18882. - Set the SO_REUSEADDR socket option before we call bind() on outgoing
  18883. connections. This change should allow busy exit relays to stop
  18884. running out of available sockets as quickly. Fixes bug 4950;
  18885. bugfix on 0.2.2.26-beta.
  18886. o Major bugfixes (blocking resistance):
  18887. - Bridges no longer include their address in NETINFO cells on outgoing
  18888. OR connections, to allow them to blend in better with clients.
  18889. Removes another avenue for enumerating bridges. Reported by
  18890. "troll_un". Fixes bug 4348; bugfix on 0.2.0.10-alpha, when NETINFO
  18891. cells were introduced.
  18892. - Warn the user when HTTPProxy, but no other proxy type, is
  18893. configured. This can cause surprising behavior: it doesn't send
  18894. all of Tor's traffic over the HTTPProxy -- it sends unencrypted
  18895. directory traffic only. Resolves ticket 4663.
  18896. o Major bugfixes (hidden services):
  18897. - Improve hidden service robustness: when an attempt to connect to
  18898. a hidden service ends, be willing to refetch its hidden service
  18899. descriptors from each of the HSDir relays responsible for them
  18900. immediately. Previously, we would not consider refetching the
  18901. service's descriptors from each HSDir for 15 minutes after the last
  18902. fetch, which was inconvenient if the hidden service was not running
  18903. during the first attempt. Bugfix on 0.2.0.18-alpha; fixes bug 3335.
  18904. - Hidden services now ignore the timestamps on INTRODUCE2 cells.
  18905. They used to check that the timestamp was within 30 minutes
  18906. of their system clock, so they could cap the size of their
  18907. replay-detection cache, but that approach unnecessarily refused
  18908. service to clients with wrong clocks. Bugfix on 0.2.1.6-alpha, when
  18909. the v3 intro-point protocol (the first one which sent a timestamp
  18910. field in the INTRODUCE2 cell) was introduced; fixes bug 3460.
  18911. - When one of a hidden service's introduction points appears to be
  18912. unreachable, stop trying it. Previously, we would keep trying
  18913. to build circuits to the introduction point until we lost the
  18914. descriptor, usually because the user gave up and restarted Tor.
  18915. Fixes part of bug 3825.
  18916. o Changes to default torrc file:
  18917. - Stop listing "socksport 9050" in torrc.sample. We open a socks
  18918. port on 9050 by default anyway, so this should not change anything
  18919. in practice.
  18920. - Stop mentioning the deprecated *ListenAddress options in
  18921. torrc.sample. Fixes bug 5438.
  18922. - Document unit of bandwidth-related options in sample torrc.
  18923. Fixes bug 5621.
  18924. - Fix broken URLs in the sample torrc file, and tell readers about
  18925. the OutboundBindAddress, ExitPolicyRejectPrivate, and
  18926. PublishServerDescriptor options. Addresses bug 4652.
  18927. o Minor features (directory authorities):
  18928. - Consider new, removed or changed IPv6 OR ports a non-cosmetic
  18929. change when the authority is deciding whether to accept a newly
  18930. uploaded descriptor. Implements ticket 6423.
  18931. - Directory authorities are now a little more lenient at accepting
  18932. older router descriptors, or newer router descriptors that don't
  18933. make big changes. This should help ameliorate past and future
  18934. issues where routers think they have uploaded valid descriptors,
  18935. but the authorities don't think so. Fix for ticket 2479.
  18936. - Authority operators can now vote for all relays in a given
  18937. set of countries to be BadDir/BadExit/Invalid/Rejected.
  18938. - Provide two consensus parameters (FastFlagMinThreshold and
  18939. FastFlagMaxThreshold) to control the range of allowable bandwidths
  18940. for the Fast directory flag. These allow authorities to run
  18941. experiments on appropriate requirements for being a "Fast" node.
  18942. The AuthDirFastGuarantee config value still applies. Implements
  18943. ticket 3946.
  18944. o Minor features (bridges / bridge authorities):
  18945. - Make bridge SSL certificates a bit more stealthy by using random
  18946. serial numbers, in the same fashion as OpenSSL when generating
  18947. self-signed certificates. Implements ticket 4584.
  18948. - Tag a bridge's descriptor as "never to be sent unencrypted".
  18949. This shouldn't matter, since bridges don't open non-anonymous
  18950. connections to the bridge authority and don't allow unencrypted
  18951. directory connections from clients, but we might as well make
  18952. sure. Closes bug 5139.
  18953. - The Bridge Authority now writes statistics on how many bridge
  18954. descriptors it gave out in total, and how many unique descriptors
  18955. it gave out. It also lists how often the most and least commonly
  18956. fetched descriptors were given out, as well as the median and
  18957. 25th/75th percentile. Implements tickets 4200 and 4294.
  18958. o Minor features (IPv6):
  18959. - Make the code that clients use to detect an address change be
  18960. IPv6-aware, so that it won't fill clients' logs with error
  18961. messages when trying to get the IPv4 address of an IPv6
  18962. connection. Implements ticket 5537.
  18963. - Relays now understand an IPv6 address when they get one from a
  18964. directory server. Resolves ticket 4875.
  18965. o Minor features (hidden services):
  18966. - Expire old or over-used hidden service introduction points.
  18967. Required by fix for bug 3460.
  18968. - Reduce the lifetime of elements of hidden services' Diffie-Hellman
  18969. public key replay-detection cache from 60 minutes to 5 minutes. This
  18970. replay-detection cache is now used only to detect multiple
  18971. INTRODUCE2 cells specifying the same rendezvous point, so we can
  18972. avoid launching multiple simultaneous attempts to connect to it.
  18973. - When a hidden service's introduction point times out, consider
  18974. trying it again during the next attempt to connect to the
  18975. HS. Previously, we would not try it again unless a newly fetched
  18976. descriptor contained it. Required by fixes for bugs 1297 and 3825.
  18977. o Minor features (relays):
  18978. - Relays now include a reason for regenerating their descriptors
  18979. in an HTTP header when uploading to the authorities. This will
  18980. make it easier to debug descriptor-upload issues in the future.
  18981. - Turn on directory request statistics by default and include them in
  18982. extra-info descriptors. Don't break if we have no GeoIP database.
  18983. - Replace files in stats/ rather than appending to them. Now that we
  18984. include statistics in extra-info descriptors, it makes no sense to
  18985. keep old statistics forever. Implements ticket 2930.
  18986. - Relays that set "ConnDirectionStatistics 1" write statistics on the
  18987. bidirectional use of connections to disk every 24 hours.
  18988. - Add a GeoIP file digest to the extra-info descriptor. Implements
  18989. ticket 1883.
  18990. o Minor features (new config options):
  18991. - New config option "DynamicDHGroups" (disabled by default) provides
  18992. each bridge with a unique prime DH modulus to be used during
  18993. SSL handshakes. This option attempts to help against censors
  18994. who might use the Apache DH modulus as a static identifier for
  18995. bridges. Addresses ticket 4548.
  18996. - New config option "DisableDebuggerAttachment" (on by default)
  18997. to prevent basic debugging attachment attempts by other processes.
  18998. Supports Mac OS X and Gnu/Linux. Resolves ticket 3313.
  18999. - Ordinarily, Tor does not count traffic from private addresses (like
  19000. 127.0.0.1 or 10.0.0.1) when calculating rate limits or accounting.
  19001. There is now a new option, CountPrivateBandwidth, to disable this
  19002. behavior. Patch from Daniel Cagara.
  19003. o Minor features (different behavior for old config options):
  19004. - Allow MapAddress directives to specify matches against super-domains,
  19005. as in "MapAddress *.torproject.org *.torproject.org.torserver.exit".
  19006. Implements issue 933.
  19007. - Don't disable the DirPort when we cannot exceed our AccountingMax
  19008. limit during this interval because the effective bandwidthrate is
  19009. low enough. This is useful in a situation where AccountMax is only
  19010. used as an additional safeguard or to provide statistics.
  19011. - Add port 6523 (Gobby) to LongLivedPorts. Patch by intrigeri;
  19012. implements ticket 3439.
  19013. - When configuring a large set of nodes in EntryNodes, and there are
  19014. enough of them listed as Guard so that we don't need to consider
  19015. the non-guard entries, prefer the ones listed with the Guard flag.
  19016. - If you set the NumCPUs option to 0, Tor will now try to detect how
  19017. many CPUs you have. This is the new default behavior.
  19018. - The NodeFamily option -- which let you declare that you want to
  19019. consider nodes to be part of a family whether they list themselves
  19020. that way or not -- now allows IP address ranges and country codes.
  19021. o Minor features (new command-line config behavior):
  19022. - Slightly change behavior of "list" options (that is, config
  19023. options that can appear more than once) when they appear both in
  19024. torrc and on the command line. Previously, the command-line options
  19025. would be appended to the ones from torrc. Now, the command-line
  19026. options override the torrc options entirely. This new behavior
  19027. allows the user to override list options (like exit policies and
  19028. ports to listen on) from the command line, rather than simply
  19029. appending to the list.
  19030. - You can get the old (appending) command-line behavior for "list"
  19031. options by prefixing the option name with a "+".
  19032. - You can remove all the values for a "list" option from the command
  19033. line without adding any new ones by prefixing the option name
  19034. with a "/".
  19035. o Minor features (controller, new events):
  19036. - Extend the control protocol to report flags that control a circuit's
  19037. path selection in CIRC events and in replies to 'GETINFO
  19038. circuit-status'. Implements part of ticket 2411.
  19039. - Extend the control protocol to report the hidden service address
  19040. and current state of a hidden-service-related circuit in CIRC
  19041. events and in replies to 'GETINFO circuit-status'. Implements part
  19042. of ticket 2411.
  19043. - Include the creation time of a circuit in CIRC and CIRC2
  19044. control-port events and the list produced by the 'GETINFO
  19045. circuit-status' control-port command.
  19046. - Add a new CONF_CHANGED event so that controllers can be notified
  19047. of any configuration changes made by other controllers, or by the
  19048. user. Implements ticket 1692.
  19049. - Add a new SIGNAL event to the controller interface so that
  19050. controllers can be notified when Tor handles a signal. Resolves
  19051. issue 1955. Patch by John Brooks.
  19052. o Minor features (controller, new getinfo options):
  19053. - Expose our view of whether we have gone dormant to the controller,
  19054. via a new "GETINFO dormant" value. Torbutton and other controllers
  19055. can use this to avoid doing periodic requests through Tor while
  19056. it's dormant (bug 4718). Resolves ticket 5954.
  19057. - Add a new GETINFO option to get total bytes read and written. Patch
  19058. from pipe, revised by atagar. Resolves ticket 2345.
  19059. - Implement new GETINFO controller fields to provide information about
  19060. the Tor process's pid, euid, username, and resource limits.
  19061. o Minor features (controller, other):
  19062. - Allow controllers to request an event notification whenever a
  19063. circuit is cannibalized or its purpose is changed. Implements
  19064. part of ticket 3457.
  19065. - Use absolute path names when reporting the torrc filename in the
  19066. control protocol, so a controller can more easily find the torrc
  19067. file. Resolves bug 1101.
  19068. - When reporting the path to the cookie file to the controller,
  19069. give an absolute path. Resolves ticket 4881.
  19070. o Minor features (log messages):
  19071. - Add more information to a log statement that might help track down
  19072. bug 4091. If you're seeing "Bug: tor_addr_is_internal() called with a
  19073. non-IP address" messages (or any Bug messages, for that matter!),
  19074. please let us know about it.
  19075. - If EntryNodes are given, but UseEntryGuards is set to 0, warn that
  19076. EntryNodes will have no effect. Resolves issue 2571.
  19077. - Try to make the introductory warning message that Tor prints on
  19078. startup more useful for actually finding help and information.
  19079. Resolves ticket 2474.
  19080. - When the system call to create a listener socket fails, log the
  19081. error message explaining why. This may help diagnose bug 4027.
  19082. o Minor features (other):
  19083. - When we fail to initialize Libevent, retry with IOCP disabled so we
  19084. don't need to turn on multi-threading support in Libevent, which in
  19085. turn requires a working socketpair(). This is a workaround for bug
  19086. 4457, which affects Libevent versions from 2.0.1-alpha through
  19087. 2.0.15-stable.
  19088. - When starting as root and then changing our UID via the User
  19089. control option, and we have a ControlSocket configured, make sure
  19090. that the ControlSocket is owned by the same account that Tor will
  19091. run under. Implements ticket 3421; fix by Jérémy Bobbio.
  19092. - Accept attempts to include a password authenticator in the
  19093. handshake, as supported by SOCKS5. This handles SOCKS clients that
  19094. don't know how to omit a password when authenticating. Resolves
  19095. bug 1666.
  19096. - Check for and recover from inconsistency in the microdescriptor
  19097. cache. This will make it harder for us to accidentally free a
  19098. microdescriptor without removing it from the appropriate data
  19099. structures. Fixes issue 3135; issue noted by "wanoskarnet".
  19100. - Shorten links in the tor-exit-notice file. Patch by Christian Kujau.
  19101. o Minor bugfixes (code security):
  19102. - Prevent a null-pointer dereference when receiving a data cell
  19103. for a nonexistent stream when the circuit in question has an
  19104. empty deliver window. We don't believe this is triggerable,
  19105. since we don't currently allow deliver windows to become empty,
  19106. but the logic is tricky enough that it's better to make the code
  19107. robust. Fixes bug 5541; bugfix on 0.0.2pre14.
  19108. - Fix a (harmless) integer overflow in cell statistics reported by
  19109. some fast relays. Fixes bug 5849; bugfix on 0.2.2.1-alpha.
  19110. - Fix our implementation of crypto_random_hostname() so it can't
  19111. overflow on ridiculously large inputs. (No Tor version has ever
  19112. provided this kind of bad inputs, but let's be correct in depth.)
  19113. Fixes bug 4413; bugfix on 0.2.2.9-alpha. Fix by Stephen Palmateer.
  19114. - Add a (probably redundant) memory clear between iterations of
  19115. the router status voting loop, to prevent future coding errors
  19116. where data might leak between iterations of the loop. Resolves
  19117. ticket 6514.
  19118. o Minor bugfixes (wrapper functions):
  19119. - Abort if tor_vasprintf() fails in connection_printf_to_buf() (a
  19120. utility function used in the control-port code). This shouldn't
  19121. ever happen unless Tor is completely out of memory, but if it did
  19122. happen and Tor somehow recovered from it, Tor could have sent a log
  19123. message to a control port in the middle of a reply to a controller
  19124. command. Fixes part of bug 3428; bugfix on 0.1.2.3-alpha.
  19125. - Fix some (not actually triggerable) buffer size checks in usage of
  19126. tor_inet_ntop(). Fixes bug 4434; bugfix on Tor 0.2.0.1-alpha. Patch
  19127. by Anders Sundman.
  19128. - Fix parsing of some corner-cases with tor_inet_pton(). Fixes
  19129. bug 4515; bugfix on 0.2.0.1-alpha; fix by Anders Sundman.
  19130. - Enforce correct return behavior of tor_vsscanf() when the '%%'
  19131. pattern is used. Fixes bug 5558. Bugfix on 0.2.1.13.
  19132. - Make our replacement implementation of strtok_r() compatible with
  19133. the standard behavior of strtok_r(). Patch by nils. Fixes bug 5091;
  19134. bugfix on 0.2.2.1-alpha.
  19135. - Find more places in the code that should have been testing for
  19136. invalid sockets using the SOCKET_OK macro. Required for a fix
  19137. for bug 4533. Bugfix on 0.2.2.28-beta.
  19138. o Minor bugfixes (code correctness):
  19139. - Check return value of fputs() when writing authority certificate
  19140. file. Fixes Coverity issue 709056; bugfix on 0.2.0.1-alpha.
  19141. - When building Tor on Windows with -DUNICODE (not default), ensure
  19142. that error messages, filenames, and DNS server names are always
  19143. NUL-terminated when we convert them to a single-byte encoding.
  19144. Fixes bug 5909; bugfix on 0.2.2.16-alpha.
  19145. - Fix a memory leak when trying to launch a DNS request when the
  19146. nameservers are unconfigurable. Fixes bug 5916; bugfix on Tor
  19147. 0.1.2.1-alpha.
  19148. - Correct file sizes when reading binary files on Cygwin, to avoid
  19149. a bug where Tor would fail to read its state file. Fixes bug 6844;
  19150. bugfix on 0.1.2.7-alpha.
  19151. - Make sure to set *socket_error in all error cases in
  19152. connection_connect(), so it can't produce a warning about
  19153. errno being zero from errno_to_orconn_end_reason(). Bugfix on
  19154. 0.2.1.1-alpha; resolves ticket 6028.
  19155. - Initialize conn->addr to a valid state in spawn_cpuworker(). Fixes
  19156. bug 4532; found by "troll_un".
  19157. o Minor bugfixes (clients):
  19158. - Allow one-hop directory-fetching circuits the full "circuit build
  19159. timeout" period, rather than just half of it, before failing them
  19160. and marking the relay down. This fix should help reduce cases where
  19161. clients declare relays (or worse, bridges) unreachable because
  19162. the TLS handshake takes a few seconds to complete. Fixes bug 6743;
  19163. bugfix on 0.2.2.2-alpha, where we changed the timeout from a static
  19164. 30 seconds.
  19165. - Ensure we don't cannibalize circuits that are longer than three hops
  19166. already, so we don't end up making circuits with 5 or more
  19167. hops. Patch contributed by wanoskarnet. Fixes bug 5231; bugfix on
  19168. 0.1.0.1-rc which introduced cannibalization.
  19169. o Minor bugfixes (relays):
  19170. - Don't publish a new relay descriptor when we reload our onion key,
  19171. unless the onion key has actually changed. Fixes bug 3263 and
  19172. resolves another cause of bug 1810. Bugfix on 0.1.1.11-alpha.
  19173. - When relays refuse a "create" cell because their queue of pending
  19174. create cells is too big (typically because their cpu can't keep up
  19175. with the arrival rate), send back reason "resource limit" rather
  19176. than reason "internal", so network measurement scripts can get a
  19177. more accurate picture. Bugfix on 0.1.1.11-alpha; fixes bug 7037.
  19178. - Exit nodes don't need to fetch certificates for authorities that
  19179. they don't recognize; only directory authorities, bridges,
  19180. and caches need to do that. Fixes part of bug 2297; bugfix on
  19181. 0.2.2.11-alpha.
  19182. o Minor bugfixes (directory authority / mirrors):
  19183. - Avoid O(n^2) performance characteristics when parsing a large
  19184. extrainfo cache. Fixes bug 5828; bugfix on 0.2.0.1-alpha.
  19185. - Authorities no longer include any router in their microdescriptor
  19186. consensuses for which they couldn't generate or agree on a
  19187. microdescriptor. Fixes the second piece of bug 6404; fix on
  19188. 0.2.2.6-alpha.
  19189. - When checking for requested signatures on the latest consensus
  19190. before serving it to a client, make sure to check the right
  19191. consensus flavor. Bugfix on 0.2.2.6-alpha.
  19192. - Fix an edge case where TestingTorNetwork is set but the authorities
  19193. and relays all have an uptime of zero, so the private Tor network
  19194. could briefly lack support for hidden services. Fixes bug 3886;
  19195. bugfix on 0.2.2.18-alpha.
  19196. - Directory caches no longer refuse to clean out descriptors because
  19197. of missing v2 networkstatus documents, unless they're configured
  19198. to retrieve v2 networkstatus documents. Fixes bug 4838; bugfix on
  19199. 0.2.2.26-beta. Patch by Daniel Bryg.
  19200. - Don't serve or accept v2 hidden service descriptors over a relay's
  19201. DirPort. It's never correct to do so, and disabling it might
  19202. make it more annoying to exploit any bugs that turn up in the
  19203. descriptor-parsing code. Fixes bug 7149.
  19204. o Minor bugfixes (hidden services, client-side):
  19205. - Assert that hidden-service-related operations are not performed
  19206. using single-hop circuits. Previously, Tor would assert that
  19207. client-side streams are not attached to single-hop circuits,
  19208. but not that other sensitive operations on the client and service
  19209. side are not performed using single-hop circuits. Fixes bug 3332;
  19210. bugfix on 0.0.6.
  19211. - Avoid undefined behavior when parsing the list of supported
  19212. rendezvous/introduction protocols in a hidden service descriptor.
  19213. Previously, Tor would have confused (as-yet-unused) protocol version
  19214. numbers greater than 32 with lower ones on many platforms. Fixes
  19215. bug 6827; bugfix on 0.2.0.10-alpha. Found by George Kadianakis.
  19216. - Don't close hidden service client circuits which have almost
  19217. finished connecting to their destination when they reach
  19218. the normal circuit-build timeout. Previously, we would close
  19219. introduction circuits which are waiting for an acknowledgement
  19220. from the introduction point, and rendezvous circuits which have
  19221. been specified in an INTRODUCE1 cell sent to a hidden service,
  19222. after the normal CBT. Now, we mark them as 'timed out', and launch
  19223. another rendezvous attempt in parallel. This behavior change can
  19224. be disabled using the new CloseHSClientCircuitsImmediatelyOnTimeout
  19225. option. Fixes part of bug 1297; bugfix on 0.2.2.2-alpha.
  19226. o Minor bugfixes (hidden services, service-side):
  19227. - Don't close hidden-service-side rendezvous circuits when they
  19228. reach the normal circuit-build timeout. This behavior change can
  19229. be disabled using the new
  19230. CloseHSServiceRendCircuitsImmediatelyOnTimeout option. Fixes the
  19231. remaining part of bug 1297; bugfix on 0.2.2.2-alpha.
  19232. - Don't launch more than 10 service-side introduction-point circuits
  19233. for a hidden service in five minutes. Previously, we would consider
  19234. launching more introduction-point circuits if at least one second
  19235. had passed without any introduction-point circuits failing. Fixes
  19236. bug 4607; bugfix on 0.0.7pre1.
  19237. o Minor bugfixes (config option behavior):
  19238. - If the user tries to set MyFamily on a bridge, refuse to
  19239. do so, and warn about the security implications. Fixes bug 4657;
  19240. bugfix on 0.2.0.3-alpha.
  19241. - The "--quiet" and "--hush" options now apply not only to Tor's
  19242. behavior before logs are configured, but also to Tor's behavior in
  19243. the absence of configured logs. Fixes bug 3550; bugfix on
  19244. 0.2.0.10-alpha.
  19245. - Change the AllowDotExit rules so they should actually work.
  19246. We now enforce AllowDotExit only immediately after receiving an
  19247. address via SOCKS or DNSPort: other sources are free to provide
  19248. .exit addresses after the resolution occurs. Fixes bug 3940;
  19249. bugfix on 0.2.2.1-alpha.
  19250. - Make "LearnCircuitBuildTimeout 0" work more reliably. Specifically,
  19251. don't depend on the consensus parameters or compute adaptive
  19252. timeouts when it is disabled. Fixes bug 5049; bugfix on
  19253. 0.2.2.14-alpha.
  19254. - After we pick a directory mirror, we would refuse to use it if
  19255. it's in our ExcludeExitNodes list, resulting in mysterious failures
  19256. to bootstrap for people who just wanted to avoid exiting from
  19257. certain locations. Fixes bug 5623; bugfix on 0.2.2.25-alpha.
  19258. - When told to add a bridge with the same digest as a preexisting
  19259. bridge but a different addr:port, change the addr:port as
  19260. requested. Previously we would not notice the change. Fixes half
  19261. of bug 5603; fix on 0.2.2.26-beta.
  19262. o Minor bugfixes (controller):
  19263. - Allow manual 'authenticate' commands to the controller interface
  19264. from netcat (nc) as well as telnet. We were rejecting them because
  19265. they didn't come with the expected whitespace at the end of the
  19266. command. Bugfix on 0.1.1.1-alpha; fixes bug 2893.
  19267. - Report a real bootstrap problem to the controller on router
  19268. identity mismatch. Previously we just said "foo", which probably
  19269. made a lot of sense at the time. Fixes bug 4169; bugfix on
  19270. 0.2.1.1-alpha.
  19271. - When we receive a SIGHUP and the controller __ReloadTorrcOnSIGHUP
  19272. option is set to 0 (which Vidalia version 0.2.16 now does when
  19273. a SAVECONF attempt fails), perform other actions that SIGHUP
  19274. usually causes (like reopening the logs). Fixes bug 5095; bugfix
  19275. on 0.2.1.9-alpha.
  19276. - Correctly handle checking the permissions on the parent
  19277. directory of a control socket in the root directory. Bug found
  19278. by Esteban Manchado Velázquez. Fixes bug 5089; bugfix on Tor
  19279. 0.2.2.26-beta.
  19280. - End AUTHCHALLENGE error messages (in the control protocol) with
  19281. a CRLF. Fixes bug 5760; bugfix on 0.2.2.36.
  19282. o Minor bugfixes (network reading/writing):
  19283. - Disable writing on marked-for-close connections when they are
  19284. blocked on bandwidth, to prevent busy-looping in Libevent. Fixes
  19285. bug 5263; bugfix on 0.0.2pre13, where we first added a special
  19286. case for flushing marked connections.
  19287. - Make sure that there are no unhandled pending TLS errors before
  19288. reading from a TLS stream. We had checks in 0.1.0.3-rc, but
  19289. lost them in 0.1.0.5-rc when we refactored read_to_buf_tls().
  19290. Bugfix on 0.1.0.5-rc; fixes bug 4528.
  19291. - Detect SSL handshake even when the initial attempt to write the
  19292. server hello fails. Fixes bug 4592; bugfix on 0.2.0.13-alpha.
  19293. - If the client fails to set a reasonable set of ciphersuites
  19294. during its v2 handshake renegotiation, allow the renegotiation to
  19295. continue nevertheless (i.e. send all the required certificates).
  19296. Fixes bug 4591; bugfix on 0.2.0.20-rc.
  19297. o Minor bugfixes (other):
  19298. - Exit nodes now correctly report EADDRINUSE and EADDRNOTAVAIL as
  19299. resource exhaustion, so that clients can adjust their load to
  19300. try other exits. Fixes bug 4710; bugfix on 0.1.0.1-rc, which
  19301. started using END_STREAM_REASON_RESOURCELIMIT.
  19302. - Don't check for whether the address we're using for outbound
  19303. connections has changed until after the outbound connection has
  19304. completed. On Windows, getsockname() doesn't succeed until the
  19305. connection is finished. Fixes bug 5374; bugfix on 0.1.1.14-alpha.
  19306. - Don't hold a Windows file handle open for every file mapping;
  19307. the file mapping handle is sufficient. Fixes bug 5951; bugfix on
  19308. 0.1.2.1-alpha.
  19309. - Fix wrong TCP port range in parse_port_range(). Fixes bug 6218;
  19310. bugfix on 0.2.1.10-alpha.
  19311. - If we fail to write a microdescriptor to the disk cache, do not
  19312. continue replacing the old microdescriptor file. Fixes bug 2954;
  19313. bugfix on 0.2.2.6-alpha.
  19314. o Minor bugfixes (log messages, path selection):
  19315. - Downgrade "set buildtimeout to low value" messages to "info"
  19316. severity; they were never an actual problem, there was never
  19317. anything reasonable to do about them, and they tended to spam logs
  19318. from time to time. Fixes bug 6251; bugfix on 0.2.2.2-alpha.
  19319. - Rate-limit the "Weighted bandwidth is 0.000000" message, and add
  19320. more information to it, so that we can track it down in case it
  19321. returns again. Mitigates bug 5235.
  19322. - Check CircuitBuildTimeout and LearnCircuitBuildTimeout in
  19323. options_validate(); warn if LearnCircuitBuildTimeout is disabled and
  19324. CircuitBuildTimeout is set unreasonably low. Resolves ticket 5452.
  19325. - Issue a log message if a guard completes less than 40% of your
  19326. circuits. Threshold is configurable by torrc option
  19327. PathBiasNoticeRate and consensus parameter pb_noticepct. There is
  19328. additional, off-by-default code to disable guards which fail too
  19329. many circuits. Addresses ticket 5458.
  19330. o Minor bugfixes (log messages, client):
  19331. - Downgrade "Got a certificate, but we already have it" log messages
  19332. from warning to info, except when we're a dirauth. Fixes bug 5238;
  19333. bugfix on 0.2.1.7-alpha.
  19334. - Fix the log message describing how we work around discovering
  19335. that our version is the ill-fated OpenSSL 0.9.8l. Fixes bug
  19336. 4837; bugfix on 0.2.2.9-alpha.
  19337. - When logging about a disallowed .exit name, do not also call it
  19338. an "invalid onion address". Fixes bug 3325; bugfix on 0.2.2.9-alpha.
  19339. - Fix a log message suggesting that people contact a non-existent
  19340. email address. Fixes bug 3448.
  19341. - Rephrase the log message emitted if the TestSocks check is
  19342. successful. Patch from Fabian Keil; fixes bug 4094.
  19343. - Log (at debug level) whenever a circuit's purpose is changed.
  19344. - Log SSL state transitions at log level DEBUG, log domain
  19345. HANDSHAKE. This can be useful for debugging censorship events.
  19346. Implements ticket 3264.
  19347. - We now log which torrc file we're using on startup. Implements
  19348. ticket 2444.
  19349. - Rate-limit log messages when asked to connect anonymously to
  19350. a private address. When these hit, they tended to hit fast and
  19351. often. Also, don't bother trying to connect to addresses that we
  19352. are sure will resolve to 127.0.0.1: getting 127.0.0.1 in a directory
  19353. reply makes us think we have been lied to, even when the address the
  19354. client tried to connect to was "localhost." Resolves ticket 2822.
  19355. o Minor bugfixes (log messages, non-client):
  19356. - Downgrade "eventdns rejected address" message to LOG_PROTOCOL_WARN.
  19357. Fixes bug 5932; bugfix on 0.2.2.7-alpha.
  19358. - Don't log that we have "decided to publish new relay descriptor"
  19359. unless we are actually publishing a descriptor. Fixes bug 3942;
  19360. bugfix on 0.2.2.28-beta.
  19361. - Log which authority we're missing votes from when we go to fetch
  19362. them from the other auths.
  19363. - Replace "Sending publish request" log messages with "Launching
  19364. upload", so that they no longer confusingly imply that we're
  19365. sending something to a directory we might not even be connected
  19366. to yet. Fixes bug 3311; bugfix on 0.2.0.10-alpha.
  19367. - Warn when Tor is configured to use accounting in a way that can
  19368. link a hidden service to some other hidden service or public
  19369. address. Resolves ticket 6490.
  19370. - Fix a minor formatting issue in one of tor-gencert's error messages.
  19371. Fixes bug 4574.
  19372. o Testing:
  19373. - Update to the latest version of the tinytest unit testing framework.
  19374. This includes a couple of bugfixes that can be relevant for
  19375. running forked unit tests on Windows, and removes all reserved
  19376. identifiers.
  19377. - Avoid a false positive in the util/threads unit test by increasing
  19378. the maximum timeout time. Fixes bug 6227; bugfix on 0.2.0.4-alpha.
  19379. - Make it possible to set the TestingTorNetwork configuration
  19380. option using AlternateDirAuthority and AlternateBridgeAuthority
  19381. as an alternative to setting DirServer. Addresses ticket 6377.
  19382. - Add a unit test for the environment_variable_names_equal() function.
  19383. - A wide variety of new unit tests by Esteban Manchado Velázquez.
  19384. - Numerous new unit tests for functions in util.c and address.c by
  19385. Anders Sundman.
  19386. - The long-disabled benchmark tests are now split into their own
  19387. ./src/test/bench binary.
  19388. - The benchmark tests can now use more accurate timers than
  19389. gettimeofday() when such timers are available.
  19390. - Use tt_assert(), not tor_assert(), for checking for test failures.
  19391. This makes the unit tests more able to go on in the event that
  19392. one of them fails.
  19393. o Build improvements:
  19394. - Use the dead_strip option when building Tor on OS X. This reduces
  19395. binary size by almost 19% when linking openssl and libevent
  19396. statically, which we do for Tor Browser Bundle.
  19397. - Provide a better error message about possible OSX Asciidoc failure
  19398. reasons. Fixes bug 6436.
  19399. - Detect attempts to build Tor on (as yet hypothetical) versions
  19400. of Windows where sizeof(intptr_t) != sizeof(SOCKET). Partial
  19401. fix for bug 4533. Bugfix on 0.2.2.28-beta.
  19402. - On Windows, we now define the _WIN32_WINNT macros only if they
  19403. are not already defined. This lets the person building Tor decide,
  19404. if they want, to require a later version of Windows.
  19405. - Our autogen.sh script now uses autoreconf to launch autoconf,
  19406. automake, and so on. This is more robust against some of the failure
  19407. modes associated with running the autotools pieces on their own.
  19408. - Running "make version" now displays the version of Tor that
  19409. we're about to build. Idea from katmagic; resolves issue 4400.
  19410. - Make 'tor --digests' list hashes of all Tor source files. Bugfix
  19411. on 0.2.2.4-alpha; fixes bug 3427.
  19412. - New --enable-static-tor configure option for building Tor as
  19413. statically as possible. Idea, general hackery and thoughts from
  19414. Alexei Czeskis, John Gilmore, Jacob Appelbaum. Implements ticket
  19415. 2702.
  19416. - Limited, experimental support for building with nmake and MSVC.
  19417. o Build requirements:
  19418. - Building Tor with bufferevent support now requires Libevent
  19419. 2.0.13-stable or later. Previous versions of Libevent had bugs in
  19420. SSL-related bufferevents and related issues that would make Tor
  19421. work badly with bufferevents. Requiring 2.0.13-stable also allows
  19422. Tor with bufferevents to take advantage of Libevent APIs
  19423. introduced after 2.0.8-rc.
  19424. - Our build system requires automake 1.6 or later to create the
  19425. Makefile.in files. Previously, you could have used 1.4.
  19426. This only affects developers and people building Tor from git;
  19427. people who build Tor from the source distribution without changing
  19428. the Makefile.am files should be fine.
  19429. - Detect when we try to build on a platform that doesn't define
  19430. AF_UNSPEC to 0. We don't work there, so refuse to compile.
  19431. o Build fixes (compile/link):
  19432. - Format more doubles with %f, not %lf. Patch from grarpamp to make
  19433. Tor build correctly on older BSDs again. Fixes bug 3894; bugfix on
  19434. Tor 0.2.0.8-alpha.
  19435. - When building with --enable-static-tor on OpenBSD, do not
  19436. erroneously attempt to link -lrt. Fixes bug 5103.
  19437. - Set _WIN32_WINNT to 0x0501 consistently throughout the code, so
  19438. that IPv6 stuff will compile on MSVC, and compilation issues
  19439. will be easier to track down. Fixes bug 5861.
  19440. - Fix build and 64-bit compile warnings from --enable-openbsd-malloc.
  19441. Fixes bug 6379. Bugfix on 0.2.0.20-rc.
  19442. - Make Tor build correctly again with -DUNICODE -D_UNICODE defined.
  19443. Fixes bug 6097; bugfix on 0.2.2.16-alpha.
  19444. o Build fixes (other):
  19445. - Use the _WIN32 macro throughout our code to detect Windows.
  19446. (Previously we had used the obsolete 'WIN32' and the idiosyncratic
  19447. 'MS_WINDOWS'.)
  19448. - Properly handle the case where the build-tree is not the same
  19449. as the source tree when generating src/common/common_sha1.i,
  19450. src/or/micro-revision.i, and src/or/or_sha1.i. Fixes bug 3953;
  19451. bugfix on 0.2.0.1-alpha.
  19452. - During configure, search for library containing cos function as
  19453. libm lives in libcore on some platforms (BeOS/Haiku). Linking
  19454. against libm was hard-coded before. Fixes the first part of bug
  19455. 4727; bugfix on 0.2.2.2-alpha. Patch and analysis by Martin Hebnes
  19456. Pedersen.
  19457. - Prevent a false positive from the check-spaces script, by disabling
  19458. the "whitespace between function name and (" check for functions
  19459. named 'op()'.
  19460. o Packaging (RPM) changes:
  19461. - Update our default RPM spec files to work with mock and rpmbuild
  19462. on RHEL/Fedora. They have an updated set of dependencies and
  19463. conflicts, a fix for an ancient typo when creating the "_tor"
  19464. user, and better instructions. Thanks to Ondrej Mikle for the
  19465. patch series. Fixes bug 6043.
  19466. - On OpenSUSE, create the /var/run/tor directory on startup if it
  19467. is not already created. Patch from Andreas Stieger. Fixes bug 2573.
  19468. o Code refactoring (safety):
  19469. - Do not use SMARTLIST_FOREACH for any loop whose body exceeds
  19470. 10 lines. Also, don't nest them. Doing so in the past has
  19471. led to hard-to-debug code. The new style is to use the
  19472. SMARTLIST_FOREACH_{BEGIN,END} pair. Addresses issue 6400.
  19473. - Use macros to indicate OpenSSL versions, so we don't need to worry
  19474. about accidental hexadecimal bit shifts.
  19475. - Use tor_sscanf() in place of scanf() in more places through the
  19476. code. This makes us a little more locale-independent, and
  19477. should help shut up code-analysis tools that can't tell
  19478. a safe sscanf string from a dangerous one.
  19479. - Convert more instances of tor_snprintf+tor_strdup into tor_asprintf.
  19480. - Use the smartlist_add_asprintf() alias more consistently.
  19481. o Code refactoring (consolidate):
  19482. - A major revision to our internal node-selecting and listing logic.
  19483. Tor already had at least two major ways to look at the question of
  19484. "which Tor servers do we know about": a list of router descriptors,
  19485. and a list of entries in the current consensus. With
  19486. microdescriptors, we're adding a third. Having so many systems
  19487. without an abstraction layer over them was hurting the codebase.
  19488. Now, we have a new "node_t" abstraction that presents a consistent
  19489. interface to a client's view of a Tor node, and holds (nearly) all
  19490. of the mutable state formerly in routerinfo_t and routerstatus_t.
  19491. - Move tor_gettimeofday_cached() into compat_libevent.c, and use
  19492. Libevent's notion of cached time when possible.
  19493. - Remove duplicate code for invoking getrlimit() from control.c.
  19494. - Use OpenSSL's built-in SSL_state_string_long() instead of our
  19495. own homebrewed ssl_state_to_string() replacement. Patch from
  19496. Emile Snyder. Fixes bug 4653.
  19497. - Change the symmetric cipher interface so that creating and
  19498. initializing a stream cipher are no longer separate functions.
  19499. o Code refactoring (separate):
  19500. - Make a new "entry connection" struct as an internal subtype of "edge
  19501. connection", to simplify the code and make exit connections smaller.
  19502. - Split connection_about_to_close() into separate functions for each
  19503. connection type.
  19504. - Rewrite the listener-selection logic so that parsing which ports
  19505. we want to listen on is now separate from binding to the ports
  19506. we want.
  19507. o Code refactoring (name changes):
  19508. - Rename a handful of old identifiers, mostly related to crypto
  19509. structures and crypto functions. By convention, our "create an
  19510. object" functions are called "type_new()", our "free an object"
  19511. functions are called "type_free()", and our types indicate that
  19512. they are types only with a final "_t". But a handful of older
  19513. types and functions broke these rules, with function names like
  19514. "type_create" or "subsystem_op_type", or with type names like
  19515. type_env_t.
  19516. - Rename Tor functions that turn strings into addresses, so that
  19517. "parse" indicates that no hostname resolution occurs, and
  19518. "lookup" indicates that hostname resolution may occur. This
  19519. should help prevent mistakes in the future. Fixes bug 3512.
  19520. - Use the name "CERTS" consistently to refer to the new cell type;
  19521. we were calling it CERT in some places and CERTS in others.
  19522. - Use a TOR_INVALID_SOCKET macro when initializing a socket to an
  19523. invalid value, rather than just -1.
  19524. - Rename the bench_{aes,dmap} functions to test_*, so that tinytest
  19525. can pick them up when the tests aren't disabled. Bugfix on
  19526. 0.2.2.4-alpha which introduced tinytest.
  19527. o Code refactoring (other):
  19528. - Defensively refactor rend_mid_rendezvous() so that protocol
  19529. violations and length checks happen in the beginning. Fixes
  19530. bug 5645.
  19531. - Remove the pure attribute from all functions that used it
  19532. previously. In many cases we assigned it incorrectly, because the
  19533. functions might assert or call impure functions, and we don't have
  19534. evidence that keeping the pure attribute is worthwhile. Implements
  19535. changes suggested in ticket 4421.
  19536. - Move the replay-detection cache for the RSA-encrypted parts of
  19537. INTRODUCE2 cells to the introduction point data structures.
  19538. Previously, we would use one replay-detection cache per hidden
  19539. service. Required by fix for bug 3460.
  19540. - The helper programs tor-gencert, tor-resolve, and tor-checkkey
  19541. no longer link against Libevent: they never used it, but
  19542. our library structure used to force them to link it.
  19543. o Removed features and files:
  19544. - Remove all internal support for unpadded RSA. We never used it, and
  19545. it would be a bad idea to start.
  19546. - Remove some workaround code for OpenSSL 0.9.6 (which is no longer
  19547. supported).
  19548. - Remove some redundant #include directives throughout the code.
  19549. Patch from Andrea Gelmini.
  19550. - Remove some old code to remember statistics about which descriptors
  19551. we've served as a directory mirror. The feature wasn't used and
  19552. is outdated now that microdescriptors are around.
  19553. - Remove some old code to work around even older versions of Tor that
  19554. used forked processes to handle DNS requests. Such versions of Tor
  19555. are no longer in use as relays.
  19556. - The "torify" script no longer supports the "tsocks" socksifier
  19557. tool, since tsocks doesn't support DNS and UDP right for Tor.
  19558. Everyone should be using torsocks instead. Fixes bugs 3530 and
  19559. 5180. Based on a patch by "ugh".
  19560. - Remove the torrc.bridge file: we don't use it for anything, and
  19561. it had become badly desynchronized from torrc.sample. Resolves
  19562. bug 5622.
  19563. o Documentation:
  19564. - Begin a doc/state-contents.txt file to explain the contents of
  19565. the Tor state file. Fixes bug 2987.
  19566. - Clarify the documentation for the Alternate*Authority options.
  19567. Fixes bug 6387.
  19568. - Document the --defaults-torrc option, and the new semantics for
  19569. overriding, extending, and clearing lists of options. Closes
  19570. bug 4748.
  19571. - Add missing man page documentation for consensus and microdesc
  19572. files. Resolves ticket 6732.
  19573. - Fix some typos in the manpages. Patch from A. Costa. Fixes bug 6500.
  19574. o Documentation fixes:
  19575. - Improve the manual's documentation for the NT Service command-line
  19576. options. Addresses ticket 3964.
  19577. - Clarify SessionGroup documentation slightly; resolves ticket 5437.
  19578. - Document the changes to the ORPort and DirPort options, and the
  19579. fact that {OR/Dir}ListenAddress is now unnecessary (and
  19580. therefore deprecated). Resolves ticket 5597.
  19581. - Correct a broken faq link in the INSTALL file. Fixes bug 2307.
  19582. - Clarify that hidden services are TCP only. Fixes bug 6024.
  19583. Changes in version 0.2.2.39 - 2012-09-11
  19584. Tor 0.2.2.39 fixes two more opportunities for remotely triggerable
  19585. assertions.
  19586. o Security fixes:
  19587. - Fix an assertion failure in tor_timegm() that could be triggered
  19588. by a badly formatted directory object. Bug found by fuzzing with
  19589. Radamsa. Fixes bug 6811; bugfix on 0.2.0.20-rc.
  19590. - Do not crash when comparing an address with port value 0 to an
  19591. address policy. This bug could have been used to cause a remote
  19592. assertion failure by or against directory authorities, or to
  19593. allow some applications to crash clients. Fixes bug 6690; bugfix
  19594. on 0.2.1.10-alpha.
  19595. Changes in version 0.2.2.38 - 2012-08-12
  19596. Tor 0.2.2.38 fixes a remotely triggerable crash bug, and fixes a timing
  19597. attack that could in theory leak path information.
  19598. o Security fixes:
  19599. - Avoid an uninitialized memory read when reading a vote or consensus
  19600. document that has an unrecognized flavor name. This read could
  19601. lead to a remote crash bug. Fixes bug 6530; bugfix on 0.2.2.6-alpha.
  19602. - Try to leak less information about what relays a client is
  19603. choosing to a side-channel attacker. Previously, a Tor client would
  19604. stop iterating through the list of available relays as soon as it
  19605. had chosen one, thus finishing a little earlier when it picked
  19606. a router earlier in the list. If an attacker can recover this
  19607. timing information (nontrivial but not proven to be impossible),
  19608. they could learn some coarse-grained information about which relays
  19609. a client was picking (middle nodes in particular are likelier to
  19610. be affected than exits). The timing attack might be mitigated by
  19611. other factors (see bug 6537 for some discussion), but it's best
  19612. not to take chances. Fixes bug 6537; bugfix on 0.0.8rc1.
  19613. Changes in version 0.2.2.37 - 2012-06-06
  19614. Tor 0.2.2.37 introduces a workaround for a critical renegotiation
  19615. bug in OpenSSL 1.0.1 (where 20% of the Tor network can't talk to itself
  19616. currently).
  19617. o Major bugfixes:
  19618. - Work around a bug in OpenSSL that broke renegotiation with TLS
  19619. 1.1 and TLS 1.2. Without this workaround, all attempts to speak
  19620. the v2 Tor connection protocol when both sides were using OpenSSL
  19621. 1.0.1 would fail. Resolves ticket 6033.
  19622. - When waiting for a client to renegotiate, don't allow it to add
  19623. any bytes to the input buffer. This fixes a potential DoS issue.
  19624. Fixes bugs 5934 and 6007; bugfix on 0.2.0.20-rc.
  19625. - Fix an edge case where if we fetch or publish a hidden service
  19626. descriptor, we might build a 4-hop circuit and then use that circuit
  19627. for exiting afterwards -- even if the new last hop doesn't obey our
  19628. ExitNodes config option. Fixes bug 5283; bugfix on 0.2.0.10-alpha.
  19629. o Minor bugfixes:
  19630. - Fix a build warning with Clang 3.1 related to our use of vasprintf.
  19631. Fixes bug 5969. Bugfix on 0.2.2.11-alpha.
  19632. o Minor features:
  19633. - Tell GCC and Clang to check for any errors in format strings passed
  19634. to the tor_v*(print|scan)f functions.
  19635. Changes in version 0.2.2.36 - 2012-05-24
  19636. Tor 0.2.2.36 updates the addresses for two of the eight directory
  19637. authorities, fixes some potential anonymity and security issues,
  19638. and fixes several crash bugs.
  19639. Tor 0.2.1.x has reached its end-of-life. Those Tor versions have many
  19640. known flaws, and nobody should be using them. You should upgrade. If
  19641. you're using a Linux or BSD and its packages are obsolete, stop using
  19642. those packages and upgrade anyway.
  19643. o Directory authority changes:
  19644. - Change IP address for maatuska (v3 directory authority).
  19645. - Change IP address for ides (v3 directory authority), and rename
  19646. it to turtles.
  19647. o Security fixes:
  19648. - When building or running with any version of OpenSSL earlier
  19649. than 0.9.8s or 1.0.0f, disable SSLv3 support. These OpenSSL
  19650. versions have a bug (CVE-2011-4576) in which their block cipher
  19651. padding includes uninitialized data, potentially leaking sensitive
  19652. information to any peer with whom they make a SSLv3 connection. Tor
  19653. does not use SSL v3 by default, but a hostile client or server
  19654. could force an SSLv3 connection in order to gain information that
  19655. they shouldn't have been able to get. The best solution here is to
  19656. upgrade to OpenSSL 0.9.8s or 1.0.0f (or later). But when building
  19657. or running with a non-upgraded OpenSSL, we disable SSLv3 entirely
  19658. to make sure that the bug can't happen.
  19659. - Never use a bridge or a controller-supplied node as an exit, even
  19660. if its exit policy allows it. Found by wanoskarnet. Fixes bug
  19661. 5342. Bugfix on 0.1.1.15-rc (for controller-purpose descriptors)
  19662. and 0.2.0.3-alpha (for bridge-purpose descriptors).
  19663. - Only build circuits if we have a sufficient threshold of the total
  19664. descriptors that are marked in the consensus with the "Exit"
  19665. flag. This mitigates an attack proposed by wanoskarnet, in which
  19666. all of a client's bridges collude to restrict the exit nodes that
  19667. the client knows about. Fixes bug 5343.
  19668. - Provide controllers with a safer way to implement the cookie
  19669. authentication mechanism. With the old method, if another locally
  19670. running program could convince a controller that it was the Tor
  19671. process, then that program could trick the controller into telling
  19672. it the contents of an arbitrary 32-byte file. The new "SAFECOOKIE"
  19673. authentication method uses a challenge-response approach to prevent
  19674. this attack. Fixes bug 5185; implements proposal 193.
  19675. o Major bugfixes:
  19676. - Avoid logging uninitialized data when unable to decode a hidden
  19677. service descriptor cookie. Fixes bug 5647; bugfix on 0.2.1.5-alpha.
  19678. - Avoid a client-side assertion failure when receiving an INTRODUCE2
  19679. cell on a general purpose circuit. Fixes bug 5644; bugfix on
  19680. 0.2.1.6-alpha.
  19681. - Fix builds when the path to sed, openssl, or sha1sum contains
  19682. spaces, which is pretty common on Windows. Fixes bug 5065; bugfix
  19683. on 0.2.2.1-alpha.
  19684. - Correct our replacements for the timeradd() and timersub() functions
  19685. on platforms that lack them (for example, Windows). The timersub()
  19686. function is used when expiring circuits, while timeradd() is
  19687. currently unused. Bug report and patch by Vektor. Fixes bug 4778;
  19688. bugfix on 0.2.2.24-alpha.
  19689. - Fix the SOCKET_OK test that we use to tell when socket
  19690. creation fails so that it works on Win64. Fixes part of bug 4533;
  19691. bugfix on 0.2.2.29-beta. Bug found by wanoskarnet.
  19692. o Minor bugfixes:
  19693. - Reject out-of-range times like 23:59:61 in parse_rfc1123_time().
  19694. Fixes bug 5346; bugfix on 0.0.8pre3.
  19695. - Make our number-parsing functions always treat too-large values
  19696. as an error, even when those values exceed the width of the
  19697. underlying type. Previously, if the caller provided these
  19698. functions with minima or maxima set to the extreme values of the
  19699. underlying integer type, these functions would return those
  19700. values on overflow rather than treating overflow as an error.
  19701. Fixes part of bug 5786; bugfix on 0.0.9.
  19702. - Older Linux kernels erroneously respond to strange nmap behavior
  19703. by having accept() return successfully with a zero-length
  19704. socket. When this happens, just close the connection. Previously,
  19705. we would try harder to learn the remote address: but there was
  19706. no such remote address to learn, and our method for trying to
  19707. learn it was incorrect. Fixes bugs 1240, 4745, and 4747. Bugfix
  19708. on 0.1.0.3-rc. Reported and diagnosed by "r1eo".
  19709. - Correct parsing of certain date types in parse_http_time().
  19710. Without this patch, If-Modified-Since would behave
  19711. incorrectly. Fixes bug 5346; bugfix on 0.2.0.2-alpha. Patch from
  19712. Esteban Manchado Velázques.
  19713. - Change the BridgePassword feature (part of the "bridge community"
  19714. design, which is not yet implemented) to use a time-independent
  19715. comparison. The old behavior might have allowed an adversary
  19716. to use timing to guess the BridgePassword value. Fixes bug 5543;
  19717. bugfix on 0.2.0.14-alpha.
  19718. - Detect and reject certain misformed escape sequences in
  19719. configuration values. Previously, these values would cause us
  19720. to crash if received in a torrc file or over an authenticated
  19721. control port. Bug found by Esteban Manchado Velázquez, and
  19722. independently by Robert Connolly from Matta Consulting who further
  19723. noted that it allows a post-authentication heap overflow. Patch
  19724. by Alexander Schrijver. Fixes bugs 5090 and 5402 (CVE 2012-1668);
  19725. bugfix on 0.2.0.16-alpha.
  19726. - Fix a compile warning when using the --enable-openbsd-malloc
  19727. configure option. Fixes bug 5340; bugfix on 0.2.0.20-rc.
  19728. - During configure, detect when we're building with clang version
  19729. 3.0 or lower and disable the -Wnormalized=id and -Woverride-init
  19730. CFLAGS. clang doesn't support them yet.
  19731. - When sending an HTTP/1.1 proxy request, include a Host header.
  19732. Fixes bug 5593; bugfix on 0.2.2.1-alpha.
  19733. - Fix a NULL-pointer dereference on a badly formed SETCIRCUITPURPOSE
  19734. command. Found by mikeyc. Fixes bug 5796; bugfix on 0.2.2.9-alpha.
  19735. - If we hit the error case where routerlist_insert() replaces an
  19736. existing (old) server descriptor, make sure to remove that
  19737. server descriptor from the old_routers list. Fix related to bug
  19738. 1776. Bugfix on 0.2.2.18-alpha.
  19739. o Minor bugfixes (documentation and log messages):
  19740. - Fix a typo in a log message in rend_service_rendezvous_has_opened().
  19741. Fixes bug 4856; bugfix on Tor 0.0.6.
  19742. - Update "ClientOnly" man page entry to explain that there isn't
  19743. really any point to messing with it. Resolves ticket 5005.
  19744. - Document the GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays
  19745. directory authority option (introduced in Tor 0.2.2.34).
  19746. - Downgrade the "We're missing a certificate" message from notice
  19747. to info: people kept mistaking it for a real problem, whereas it
  19748. is seldom the problem even when we are failing to bootstrap. Fixes
  19749. bug 5067; bugfix on 0.2.0.10-alpha.
  19750. - Correctly spell "connect" in a log message on failure to create a
  19751. controlsocket. Fixes bug 4803; bugfix on 0.2.2.26-beta.
  19752. - Clarify the behavior of MaxCircuitDirtiness with hidden service
  19753. circuits. Fixes issue 5259.
  19754. o Minor features:
  19755. - Directory authorities now reject versions of Tor older than
  19756. 0.2.1.30, and Tor versions between 0.2.2.1-alpha and 0.2.2.20-alpha
  19757. inclusive. These versions accounted for only a small fraction of
  19758. the Tor network, and have numerous known security issues. Resolves
  19759. issue 4788.
  19760. - Update to the May 1 2012 Maxmind GeoLite Country database.
  19761. - Feature removal:
  19762. - When sending or relaying a RELAY_EARLY cell, we used to convert
  19763. it to a RELAY cell if the connection was using the v1 link
  19764. protocol. This was a workaround for older versions of Tor, which
  19765. didn't handle RELAY_EARLY cells properly. Now that all supported
  19766. versions can handle RELAY_EARLY cells, and now that we're enforcing
  19767. the "no RELAY_EXTEND commands except in RELAY_EARLY cells" rule,
  19768. remove this workaround. Addresses bug 4786.
  19769. Changes in version 0.2.2.35 - 2011-12-16
  19770. Tor 0.2.2.35 fixes a critical heap-overflow security issue in Tor's
  19771. buffers code. Absolutely everybody should upgrade.
  19772. The bug relied on an incorrect calculation when making data continuous
  19773. in one of our IO buffers, if the first chunk of the buffer was
  19774. misaligned by just the wrong amount. The miscalculation would allow an
  19775. attacker to overflow a piece of heap-allocated memory. To mount this
  19776. attack, the attacker would need to either open a SOCKS connection to
  19777. Tor's SocksPort (usually restricted to localhost), or target a Tor
  19778. instance configured to make its connections through a SOCKS proxy
  19779. (which Tor does not do by default).
  19780. Good security practice requires that all heap-overflow bugs should be
  19781. presumed to be exploitable until proven otherwise, so we are treating
  19782. this as a potential code execution attack. Please upgrade immediately!
  19783. This bug does not affect bufferevents-based builds of Tor. Special
  19784. thanks to "Vektor" for reporting this issue to us!
  19785. Tor 0.2.2.35 also fixes several bugs in previous versions, including
  19786. crash bugs for unusual configurations, and a long-term bug that
  19787. would prevent Tor from starting on Windows machines with draconian
  19788. AV software.
  19789. With this release, we remind everyone that 0.2.0.x has reached its
  19790. formal end-of-life. Those Tor versions have many known flaws, and
  19791. nobody should be using them. You should upgrade -- ideally to the
  19792. 0.2.2.x series. If you're using a Linux or BSD and its packages are
  19793. obsolete, stop using those packages and upgrade anyway.
  19794. The Tor 0.2.1.x series is also approaching its end-of-life: it will no
  19795. longer receive support after some time in early 2012.
  19796. o Major bugfixes:
  19797. - Fix a heap overflow bug that could occur when trying to pull
  19798. data into the first chunk of a buffer, when that chunk had
  19799. already had some data drained from it. Fixes CVE-2011-2778;
  19800. bugfix on 0.2.0.16-alpha. Reported by "Vektor".
  19801. - Initialize Libevent with the EVENT_BASE_FLAG_NOLOCK flag enabled, so
  19802. that it doesn't attempt to allocate a socketpair. This could cause
  19803. some problems on Windows systems with overzealous firewalls. Fix for
  19804. bug 4457; workaround for Libevent versions 2.0.1-alpha through
  19805. 2.0.15-stable.
  19806. - If we mark an OR connection for close based on a cell we process,
  19807. don't process any further cells on it. We already avoid further
  19808. reads on marked-for-close connections, but now we also discard the
  19809. cells we'd already read. Fixes bug 4299; bugfix on 0.2.0.10-alpha,
  19810. which was the first version where we might mark a connection for
  19811. close based on processing a cell on it.
  19812. - Correctly sanity-check that we don't underflow on a memory
  19813. allocation (and then assert) for hidden service introduction
  19814. point decryption. Bug discovered by Dan Rosenberg. Fixes bug 4410;
  19815. bugfix on 0.2.1.5-alpha.
  19816. - Fix a memory leak when we check whether a hidden service
  19817. descriptor has any usable introduction points left. Fixes bug
  19818. 4424. Bugfix on 0.2.2.25-alpha.
  19819. - Don't crash when we're running as a relay and don't have a GeoIP
  19820. file. Bugfix on 0.2.2.34; fixes bug 4340. This backports a fix
  19821. we've had in the 0.2.3.x branch already.
  19822. - When running as a client, do not print a misleading (and plain
  19823. wrong) log message that we're collecting "directory request"
  19824. statistics: clients don't collect statistics. Also don't create a
  19825. useless (because empty) stats file in the stats/ directory. Fixes
  19826. bug 4353; bugfix on 0.2.2.34.
  19827. o Minor bugfixes:
  19828. - Detect failure to initialize Libevent. This fix provides better
  19829. detection for future instances of bug 4457.
  19830. - Avoid frequent calls to the fairly expensive cull_wedged_cpuworkers
  19831. function. This was eating up hideously large amounts of time on some
  19832. busy servers. Fixes bug 4518; bugfix on 0.0.9.8.
  19833. - Resolve an integer overflow bug in smartlist_ensure_capacity().
  19834. Fixes bug 4230; bugfix on Tor 0.1.0.1-rc. Based on a patch by
  19835. Mansour Moufid.
  19836. - Don't warn about unused log_mutex in log.c when building with
  19837. --disable-threads using a recent GCC. Fixes bug 4437; bugfix on
  19838. 0.1.0.6-rc which introduced --disable-threads.
  19839. - When configuring, starting, or stopping an NT service, stop
  19840. immediately after the service configuration attempt has succeeded
  19841. or failed. Fixes bug 3963; bugfix on 0.2.0.7-alpha.
  19842. - When sending a NETINFO cell, include the original address
  19843. received for the other side, not its canonical address. Found
  19844. by "troll_un"; fixes bug 4349; bugfix on 0.2.0.10-alpha.
  19845. - Fix a typo in a hibernation-related log message. Fixes bug 4331;
  19846. bugfix on 0.2.2.23-alpha; found by "tmpname0901".
  19847. - Fix a memory leak in launch_direct_bridge_descriptor_fetch() that
  19848. occurred when a client tried to fetch a descriptor for a bridge
  19849. in ExcludeNodes. Fixes bug 4383; bugfix on 0.2.2.25-alpha.
  19850. - Backport fixes for a pair of compilation warnings on Windows.
  19851. Fixes bug 4521; bugfix on 0.2.2.28-beta and on 0.2.2.29-beta.
  19852. - If we had ever tried to call tor_addr_to_str on an address of
  19853. unknown type, we would have done a strdup on an uninitialized
  19854. buffer. Now we won't. Fixes bug 4529; bugfix on 0.2.1.3-alpha.
  19855. Reported by "troll_un".
  19856. - Correctly detect and handle transient lookup failures from
  19857. tor_addr_lookup. Fixes bug 4530; bugfix on 0.2.1.5-alpha.
  19858. Reported by "troll_un".
  19859. - Fix null-pointer access that could occur if TLS allocation failed.
  19860. Fixes bug 4531; bugfix on 0.2.0.20-rc. Found by "troll_un".
  19861. - Use tor_socket_t type for listener argument to accept(). Fixes bug
  19862. 4535; bugfix on 0.2.2.28-beta. Found by "troll_un".
  19863. o Minor features:
  19864. - Add two new config options for directory authorities:
  19865. AuthDirFastGuarantee sets a bandwidth threshold for guaranteeing the
  19866. Fast flag, and AuthDirGuardBWGuarantee sets a bandwidth threshold
  19867. that is always sufficient to satisfy the bandwidth requirement for
  19868. the Guard flag. Now it will be easier for researchers to simulate
  19869. Tor networks with different values. Resolves ticket 4484.
  19870. - When Tor ignores a hidden service specified in its configuration,
  19871. include the hidden service's directory in the warning message.
  19872. Previously, we would only tell the user that some hidden service
  19873. was ignored. Bugfix on 0.0.6; fixes bug 4426.
  19874. - Update to the December 6 2011 Maxmind GeoLite Country database.
  19875. o Packaging changes:
  19876. - Make it easier to automate expert package builds on Windows,
  19877. by removing an absolute path from makensis.exe command.
  19878. Changes in version 0.2.1.32 - 2011-12-16
  19879. Tor 0.2.1.32 backports important security and privacy fixes for
  19880. oldstable. This release is intended only for package maintainers and
  19881. others who cannot use the 0.2.2 stable series. All others should be
  19882. using Tor 0.2.2.x or newer.
  19883. The Tor 0.2.1.x series will reach formal end-of-life some time in
  19884. early 2012; we will stop releasing patches for it then.
  19885. o Major bugfixes (also included in 0.2.2.x):
  19886. - Correctly sanity-check that we don't underflow on a memory
  19887. allocation (and then assert) for hidden service introduction
  19888. point decryption. Bug discovered by Dan Rosenberg. Fixes bug 4410;
  19889. bugfix on 0.2.1.5-alpha.
  19890. - Fix a heap overflow bug that could occur when trying to pull
  19891. data into the first chunk of a buffer, when that chunk had
  19892. already had some data drained from it. Fixes CVE-2011-2778;
  19893. bugfix on 0.2.0.16-alpha. Reported by "Vektor".
  19894. o Minor features:
  19895. - Update to the December 6 2011 Maxmind GeoLite Country database.
  19896. Changes in version 0.2.2.34 - 2011-10-26
  19897. Tor 0.2.2.34 fixes a critical anonymity vulnerability where an attacker
  19898. can deanonymize Tor users. Everybody should upgrade.
  19899. The attack relies on four components: 1) Clients reuse their TLS cert
  19900. when talking to different relays, so relays can recognize a user by
  19901. the identity key in her cert. 2) An attacker who knows the client's
  19902. identity key can probe each guard relay to see if that identity key
  19903. is connected to that guard relay right now. 3) A variety of active
  19904. attacks in the literature (starting from "Low-Cost Traffic Analysis
  19905. of Tor" by Murdoch and Danezis in 2005) allow a malicious website to
  19906. discover the guard relays that a Tor user visiting the website is using.
  19907. 4) Clients typically pick three guards at random, so the set of guards
  19908. for a given user could well be a unique fingerprint for her. This
  19909. release fixes components #1 and #2, which is enough to block the attack;
  19910. the other two remain as open research problems. Special thanks to
  19911. "frosty_un" for reporting the issue to us!
  19912. Clients should upgrade so they are no longer recognizable by the TLS
  19913. certs they present. Relays should upgrade so they no longer allow a
  19914. remote attacker to probe them to test whether unpatched clients are
  19915. currently connected to them.
  19916. This release also fixes several vulnerabilities that allow an attacker
  19917. to enumerate bridge relays. Some bridge enumeration attacks still
  19918. remain; see for example proposal 188.
  19919. o Privacy/anonymity fixes (clients):
  19920. - Clients and bridges no longer send TLS certificate chains on
  19921. outgoing OR connections. Previously, each client or bridge would
  19922. use the same cert chain for all outgoing OR connections until
  19923. its IP address changes, which allowed any relay that the client
  19924. or bridge contacted to determine which entry guards it is using.
  19925. Fixes CVE-2011-2768. Bugfix on 0.0.9pre5; found by "frosty_un".
  19926. - If a relay receives a CREATE_FAST cell on a TLS connection, it
  19927. no longer considers that connection as suitable for satisfying a
  19928. circuit EXTEND request. Now relays can protect clients from the
  19929. CVE-2011-2768 issue even if the clients haven't upgraded yet.
  19930. - Directory authorities no longer assign the Guard flag to relays
  19931. that haven't upgraded to the above "refuse EXTEND requests
  19932. to client connections" fix. Now directory authorities can
  19933. protect clients from the CVE-2011-2768 issue even if neither
  19934. the clients nor the relays have upgraded yet. There's a new
  19935. "GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays" config option
  19936. to let us transition smoothly, else tomorrow there would be no
  19937. guard relays.
  19938. o Privacy/anonymity fixes (bridge enumeration):
  19939. - Bridge relays now do their directory fetches inside Tor TLS
  19940. connections, like all the other clients do, rather than connecting
  19941. directly to the DirPort like public relays do. Removes another
  19942. avenue for enumerating bridges. Fixes bug 4115; bugfix on 0.2.0.35.
  19943. - Bridges relays now build circuits for themselves in a more similar
  19944. way to how clients build them. Removes another avenue for
  19945. enumerating bridges. Fixes bug 4124; bugfix on 0.2.0.3-alpha,
  19946. when bridges were introduced.
  19947. - Bridges now refuse CREATE or CREATE_FAST cells on OR connections
  19948. that they initiated. Relays could distinguish incoming bridge
  19949. connections from client connections, creating another avenue for
  19950. enumerating bridges. Fixes CVE-2011-2769. Bugfix on 0.2.0.3-alpha.
  19951. Found by "frosty_un".
  19952. o Major bugfixes:
  19953. - Fix a crash bug when changing node restrictions while a DNS lookup
  19954. is in-progress. Fixes bug 4259; bugfix on 0.2.2.25-alpha. Bugfix
  19955. by "Tey'".
  19956. - Don't launch a useless circuit after failing to use one of a
  19957. hidden service's introduction points. Previously, we would
  19958. launch a new introduction circuit, but not set the hidden service
  19959. which that circuit was intended to connect to, so it would never
  19960. actually be used. A different piece of code would then create a
  19961. new introduction circuit correctly. Bug reported by katmagic and
  19962. found by Sebastian Hahn. Bugfix on 0.2.1.13-alpha; fixes bug 4212.
  19963. o Minor bugfixes:
  19964. - Change an integer overflow check in the OpenBSD_Malloc code so
  19965. that GCC is less likely to eliminate it as impossible. Patch
  19966. from Mansour Moufid. Fixes bug 4059.
  19967. - When a hidden service turns an extra service-side introduction
  19968. circuit into a general-purpose circuit, free the rend_data and
  19969. intro_key fields first, so we won't leak memory if the circuit
  19970. is cannibalized for use as another service-side introduction
  19971. circuit. Bugfix on 0.2.1.7-alpha; fixes bug 4251.
  19972. - Bridges now skip DNS self-tests, to act a little more stealthily.
  19973. Fixes bug 4201; bugfix on 0.2.0.3-alpha, which first introduced
  19974. bridges. Patch by "warms0x".
  19975. - Fix internal bug-checking logic that was supposed to catch
  19976. failures in digest generation so that it will fail more robustly
  19977. if we ask for a nonexistent algorithm. Found by Coverity Scan.
  19978. Bugfix on 0.2.2.1-alpha; fixes Coverity CID 479.
  19979. - Report any failure in init_keys() calls launched because our
  19980. IP address has changed. Spotted by Coverity Scan. Bugfix on
  19981. 0.1.1.4-alpha; fixes CID 484.
  19982. o Minor bugfixes (log messages and documentation):
  19983. - Remove a confusing dollar sign from the example fingerprint in the
  19984. man page, and also make the example fingerprint a valid one. Fixes
  19985. bug 4309; bugfix on 0.2.1.3-alpha.
  19986. - The next version of Windows will be called Windows 8, and it has
  19987. a major version of 6, minor version of 2. Correctly identify that
  19988. version instead of calling it "Very recent version". Resolves
  19989. ticket 4153; reported by funkstar.
  19990. - Downgrade log messages about circuit timeout calibration from
  19991. "notice" to "info": they don't require or suggest any human
  19992. intervention. Patch from Tom Lowenthal. Fixes bug 4063;
  19993. bugfix on 0.2.2.14-alpha.
  19994. o Minor features:
  19995. - Turn on directory request statistics by default and include them in
  19996. extra-info descriptors. Don't break if we have no GeoIP database.
  19997. Backported from 0.2.3.1-alpha; implements ticket 3951.
  19998. - Update to the October 4 2011 Maxmind GeoLite Country database.
  19999. Changes in version 0.2.1.31 - 2011-10-26
  20000. Tor 0.2.1.31 backports important security and privacy fixes for
  20001. oldstable. This release is intended only for package maintainers and
  20002. others who cannot use the 0.2.2 stable series. All others should be
  20003. using Tor 0.2.2.x or newer.
  20004. o Security fixes (also included in 0.2.2.x):
  20005. - Replace all potentially sensitive memory comparison operations
  20006. with versions whose runtime does not depend on the data being
  20007. compared. This will help resist a class of attacks where an
  20008. adversary can use variations in timing information to learn
  20009. sensitive data. Fix for one case of bug 3122. (Safe memcmp
  20010. implementation by Robert Ransom based partially on code by DJB.)
  20011. - Fix an assert in parsing router descriptors containing IPv6
  20012. addresses. This one took down the directory authorities when
  20013. somebody tried some experimental code. Bugfix on 0.2.1.3-alpha.
  20014. o Privacy/anonymity fixes (also included in 0.2.2.x):
  20015. - Clients and bridges no longer send TLS certificate chains on
  20016. outgoing OR connections. Previously, each client or bridge would
  20017. use the same cert chain for all outgoing OR connections until
  20018. its IP address changes, which allowed any relay that the client
  20019. or bridge contacted to determine which entry guards it is using.
  20020. Fixes CVE-2011-2768. Bugfix on 0.0.9pre5; found by "frosty_un".
  20021. - If a relay receives a CREATE_FAST cell on a TLS connection, it
  20022. no longer considers that connection as suitable for satisfying a
  20023. circuit EXTEND request. Now relays can protect clients from the
  20024. CVE-2011-2768 issue even if the clients haven't upgraded yet.
  20025. - Bridges now refuse CREATE or CREATE_FAST cells on OR connections
  20026. that they initiated. Relays could distinguish incoming bridge
  20027. connections from client connections, creating another avenue for
  20028. enumerating bridges. Fixes CVE-2011-2769. Bugfix on 0.2.0.3-alpha.
  20029. Found by "frosty_un".
  20030. - When receiving a hidden service descriptor, check that it is for
  20031. the hidden service we wanted. Previously, Tor would store any
  20032. hidden service descriptors that a directory gave it, whether it
  20033. wanted them or not. This wouldn't have let an attacker impersonate
  20034. a hidden service, but it did let directories pre-seed a client
  20035. with descriptors that it didn't want. Bugfix on 0.0.6.
  20036. - Avoid linkability based on cached hidden service descriptors: forget
  20037. all hidden service descriptors cached as a client when processing a
  20038. SIGNAL NEWNYM command. Fixes bug 3000; bugfix on 0.0.6.
  20039. - Make the bridge directory authority refuse to answer directory
  20040. requests for "all" descriptors. It used to include bridge
  20041. descriptors in its answer, which was a major information leak.
  20042. Found by "piebeer". Bugfix on 0.2.0.3-alpha.
  20043. - Don't attach new streams to old rendezvous circuits after SIGNAL
  20044. NEWNYM. Previously, we would keep using an existing rendezvous
  20045. circuit if it remained open (i.e. if it were kept open by a
  20046. long-lived stream, or if a new stream were attached to it before
  20047. Tor could notice that it was old and no longer in use). Bugfix on
  20048. 0.1.1.15-rc; fixes bug 3375.
  20049. o Minor bugfixes (also included in 0.2.2.x):
  20050. - When we restart our relay, we might get a successful connection
  20051. from the outside before we've started our reachability tests,
  20052. triggering a warning: "ORPort found reachable, but I have no
  20053. routerinfo yet. Failing to inform controller of success." This
  20054. bug was harmless unless Tor is running under a controller
  20055. like Vidalia, in which case the controller would never get a
  20056. REACHABILITY_SUCCEEDED status event. Bugfix on 0.1.2.6-alpha;
  20057. fixes bug 1172.
  20058. - Build correctly on OSX with zlib 1.2.4 and higher with all warnings
  20059. enabled. Fixes bug 1526.
  20060. - Remove undocumented option "-F" from tor-resolve: it hasn't done
  20061. anything since 0.2.1.16-rc.
  20062. - Avoid signed/unsigned comparisons by making SIZE_T_CEILING unsigned.
  20063. None of the cases where we did this before were wrong, but by making
  20064. this change we avoid warnings. Fixes bug 2475; bugfix on 0.2.1.28.
  20065. - Fix a rare crash bug that could occur when a client was configured
  20066. with a large number of bridges. Fixes bug 2629; bugfix on
  20067. 0.2.1.2-alpha. Bugfix by trac user "shitlei".
  20068. - Correct the warning displayed when a rendezvous descriptor exceeds
  20069. the maximum size. Fixes bug 2750; bugfix on 0.2.1.5-alpha. Found by
  20070. John Brooks.
  20071. - Fix an uncommon assertion failure when running with DNSPort under
  20072. heavy load. Fixes bug 2933; bugfix on 0.2.0.1-alpha.
  20073. - When warning about missing zlib development packages during compile,
  20074. give the correct package names. Bugfix on 0.2.0.1-alpha.
  20075. - Require that introduction point keys and onion keys have public
  20076. exponent 65537. Bugfix on 0.2.0.10-alpha.
  20077. - Do not crash when our configuration file becomes unreadable, for
  20078. example due to a permissions change, between when we start up
  20079. and when a controller calls SAVECONF. Fixes bug 3135; bugfix
  20080. on 0.0.9pre6.
  20081. - Fix warnings from GCC 4.6's "-Wunused-but-set-variable" option.
  20082. Fixes bug 3208.
  20083. - Always NUL-terminate the sun_path field of a sockaddr_un before
  20084. passing it to the kernel. (Not a security issue: kernels are
  20085. smart enough to reject bad sockaddr_uns.) Found by Coverity;
  20086. CID #428. Bugfix on Tor 0.2.0.3-alpha.
  20087. - Don't stack-allocate the list of supplementary GIDs when we're
  20088. about to log them. Stack-allocating NGROUPS_MAX gid_t elements
  20089. could take up to 256K, which is way too much stack. Found by
  20090. Coverity; CID #450. Bugfix on 0.2.1.7-alpha.
  20091. o Minor bugfixes (only in 0.2.1.x):
  20092. - Resume using micro-version numbers in 0.2.1.x: our Debian packages
  20093. rely on them. Bugfix on 0.2.1.30.
  20094. - Use git revisions instead of svn revisions when generating our
  20095. micro-version numbers. Bugfix on 0.2.1.15-rc; fixes bug 2402.
  20096. o Minor features (also included in 0.2.2.x):
  20097. - Adjust the expiration time on our SSL session certificates to
  20098. better match SSL certs seen in the wild. Resolves ticket 4014.
  20099. - Allow nameservers with IPv6 address. Resolves bug 2574.
  20100. - Update to the October 4 2011 Maxmind GeoLite Country database.
  20101. Changes in version 0.2.2.33 - 2011-09-13
  20102. Tor 0.2.2.33 fixes several bugs, and includes a slight tweak to Tor's
  20103. TLS handshake that makes relays and bridges that run this new version
  20104. reachable from Iran again.
  20105. o Major bugfixes:
  20106. - Avoid an assertion failure when reloading a configuration with
  20107. TrackExitHosts changes. Found and fixed by 'laruldan'. Fixes bug
  20108. 3923; bugfix on 0.2.2.25-alpha.
  20109. o Minor features (security):
  20110. - Check for replays of the public-key encrypted portion of an
  20111. INTRODUCE1 cell, in addition to the current check for replays of
  20112. the g^x value. This prevents a possible class of active attacks
  20113. by an attacker who controls both an introduction point and a
  20114. rendezvous point, and who uses the malleability of AES-CTR to
  20115. alter the encrypted g^x portion of the INTRODUCE1 cell. We think
  20116. that these attacks are infeasible (requiring the attacker to send
  20117. on the order of zettabytes of altered cells in a short interval),
  20118. but we'd rather block them off in case there are any classes of
  20119. this attack that we missed. Reported by Willem Pinckaers.
  20120. o Minor features:
  20121. - Adjust the expiration time on our SSL session certificates to
  20122. better match SSL certs seen in the wild. Resolves ticket 4014.
  20123. - Change the default required uptime for a relay to be accepted as
  20124. a HSDir (hidden service directory) from 24 hours to 25 hours.
  20125. Improves on 0.2.0.10-alpha; resolves ticket 2649.
  20126. - Add a VoteOnHidServDirectoriesV2 config option to allow directory
  20127. authorities to abstain from voting on assignment of the HSDir
  20128. consensus flag. Related to bug 2649.
  20129. - Update to the September 6 2011 Maxmind GeoLite Country database.
  20130. o Minor bugfixes (documentation and log messages):
  20131. - Correct the man page to explain that HashedControlPassword and
  20132. CookieAuthentication can both be set, in which case either method
  20133. is sufficient to authenticate to Tor. Bugfix on 0.2.0.7-alpha,
  20134. when we decided to allow these config options to both be set. Issue
  20135. raised by bug 3898.
  20136. - Demote the 'replay detected' log message emitted when a hidden
  20137. service receives the same Diffie-Hellman public key in two different
  20138. INTRODUCE2 cells to info level. A normal Tor client can cause that
  20139. log message during its normal operation. Bugfix on 0.2.1.6-alpha;
  20140. fixes part of bug 2442.
  20141. - Demote the 'INTRODUCE2 cell is too {old,new}' log message to info
  20142. level. There is nothing that a hidden service's operator can do
  20143. to fix its clients' clocks. Bugfix on 0.2.1.6-alpha; fixes part
  20144. of bug 2442.
  20145. - Clarify a log message specifying the characters permitted in
  20146. HiddenServiceAuthorizeClient client names. Previously, the log
  20147. message said that "[A-Za-z0-9+-_]" were permitted; that could have
  20148. given the impression that every ASCII character between "+" and "_"
  20149. was permitted. Now we say "[A-Za-z0-9+_-]". Bugfix on 0.2.1.5-alpha.
  20150. o Build fixes:
  20151. - Provide a substitute implementation of lround() for MSVC, which
  20152. apparently lacks it. Patch from Gisle Vanem.
  20153. - Clean up some code issues that prevented Tor from building on older
  20154. BSDs. Fixes bug 3894; reported by "grarpamp".
  20155. - Search for a platform-specific version of "ar" when cross-compiling.
  20156. Should fix builds on iOS. Resolves bug 3909, found by Marco Bonetti.
  20157. Changes in version 0.2.2.32 - 2011-08-27
  20158. The Tor 0.2.2 release series is dedicated to the memory of Andreas
  20159. Pfitzmann (1958-2010), a pioneer in anonymity and privacy research,
  20160. a founder of the PETS community, a leader in our field, a mentor,
  20161. and a friend. He left us with these words: "I had the possibility
  20162. to contribute to this world that is not as it should be. I hope I
  20163. could help in some areas to make the world a better place, and that
  20164. I could also encourage other people to be engaged in improving the
  20165. world. Please, stay engaged. This world needs you, your love, your
  20166. initiative -- now I cannot be part of that anymore."
  20167. Tor 0.2.2.32, the first stable release in the 0.2.2 branch, is finally
  20168. ready. More than two years in the making, this release features improved
  20169. client performance and hidden service reliability, better compatibility
  20170. for Android, correct behavior for bridges that listen on more than
  20171. one address, more extensible and flexible directory object handling,
  20172. better reporting of network statistics, improved code security, and
  20173. many many other features and bugfixes.
  20174. o Major features (client performance):
  20175. - When choosing which cells to relay first, relays now favor circuits
  20176. that have been quiet recently, to provide lower latency for
  20177. low-volume circuits. By default, relays enable or disable this
  20178. feature based on a setting in the consensus. They can override
  20179. this default by using the new "CircuitPriorityHalflife" config
  20180. option. Design and code by Ian Goldberg, Can Tang, and Chris
  20181. Alexander.
  20182. - Directory authorities now compute consensus weightings that instruct
  20183. clients how to weight relays flagged as Guard, Exit, Guard+Exit,
  20184. and no flag. Clients use these weightings to distribute network load
  20185. more evenly across these different relay types. The weightings are
  20186. in the consensus so we can change them globally in the future. Extra
  20187. thanks to "outofwords" for finding some nasty security bugs in
  20188. the first implementation of this feature.
  20189. o Major features (client performance, circuit build timeout):
  20190. - Tor now tracks how long it takes to build client-side circuits
  20191. over time, and adapts its timeout to local network performance.
  20192. Since a circuit that takes a long time to build will also provide
  20193. bad performance, we get significant latency improvements by
  20194. discarding the slowest 20% of circuits. Specifically, Tor creates
  20195. circuits more aggressively than usual until it has enough data
  20196. points for a good timeout estimate. Implements proposal 151.
  20197. - Circuit build timeout constants can be controlled by consensus
  20198. parameters. We set good defaults for these parameters based on
  20199. experimentation on broadband and simulated high-latency links.
  20200. - Circuit build time learning can be disabled via consensus parameter
  20201. or by the client via a LearnCircuitBuildTimeout config option. We
  20202. also automatically disable circuit build time calculation if either
  20203. AuthoritativeDirectory is set, or if we fail to write our state
  20204. file. Implements ticket 1296.
  20205. o Major features (relays use their capacity better):
  20206. - Set SO_REUSEADDR socket option on all sockets, not just
  20207. listeners. This should help busy exit nodes avoid running out of
  20208. useable ports just because all the ports have been used in the
  20209. near past. Resolves issue 2850.
  20210. - Relays now save observed peak bandwidth throughput rates to their
  20211. state file (along with total usage, which was already saved),
  20212. so that they can determine their correct estimated bandwidth on
  20213. restart. Resolves bug 1863, where Tor relays would reset their
  20214. estimated bandwidth to 0 after restarting.
  20215. - Lower the maximum weighted-fractional-uptime cutoff to 98%. This
  20216. should give us approximately 40-50% more Guard-flagged nodes,
  20217. improving the anonymity the Tor network can provide and also
  20218. decreasing the dropoff in throughput that relays experience when
  20219. they first get the Guard flag.
  20220. - Directory authorities now take changes in router IP address and
  20221. ORPort into account when determining router stability. Previously,
  20222. if a router changed its IP or ORPort, the authorities would not
  20223. treat it as having any downtime for the purposes of stability
  20224. calculation, whereas clients would experience downtime since the
  20225. change would take a while to propagate to them. Resolves issue 1035.
  20226. - New AccelName and AccelDir options add support for dynamic OpenSSL
  20227. hardware crypto acceleration engines.
  20228. o Major features (relays control their load better):
  20229. - Exit relays now try harder to block exit attempts from unknown
  20230. relays, to make it harder for people to use them as one-hop proxies
  20231. a la tortunnel. Controlled by the refuseunknownexits consensus
  20232. parameter (currently enabled), or you can override it on your
  20233. relay with the RefuseUnknownExits torrc option. Resolves bug 1751;
  20234. based on a variant of proposal 163.
  20235. - Add separate per-conn write limiting to go with the per-conn read
  20236. limiting. We added a global write limit in Tor 0.1.2.5-alpha,
  20237. but never per-conn write limits.
  20238. - New consensus params "bwconnrate" and "bwconnburst" to let us
  20239. rate-limit client connections as they enter the network. It's
  20240. controlled in the consensus so we can turn it on and off for
  20241. experiments. It's starting out off. Based on proposal 163.
  20242. o Major features (controllers):
  20243. - Export GeoIP information on bridge usage to controllers even if we
  20244. have not yet been running for 24 hours. Now Vidalia bridge operators
  20245. can get more accurate and immediate feedback about their
  20246. contributions to the network.
  20247. - Add an __OwningControllerProcess configuration option and a
  20248. TAKEOWNERSHIP control-port command. Now a Tor controller can ensure
  20249. that when it exits, Tor will shut down. Implements feature 3049.
  20250. o Major features (directory authorities):
  20251. - Directory authorities now create, vote on, and serve multiple
  20252. parallel formats of directory data as part of their voting process.
  20253. Partially implements Proposal 162: "Publish the consensus in
  20254. multiple flavors".
  20255. - Directory authorities now agree on and publish small summaries
  20256. of router information that clients can use in place of regular
  20257. server descriptors. This transition will allow Tor 0.2.3 clients
  20258. to use far less bandwidth for downloading information about the
  20259. network. Begins the implementation of Proposal 158: "Clients
  20260. download consensus + microdescriptors".
  20261. - The directory voting system is now extensible to use multiple hash
  20262. algorithms for signatures and resource selection. Newer formats
  20263. are signed with SHA256, with a possibility for moving to a better
  20264. hash algorithm in the future.
  20265. - Directory authorities can now vote on arbitrary integer values as
  20266. part of the consensus process. This is designed to help set
  20267. network-wide parameters. Implements proposal 167.
  20268. o Major features and bugfixes (node selection):
  20269. - Revise and reconcile the meaning of the ExitNodes, EntryNodes,
  20270. ExcludeEntryNodes, ExcludeExitNodes, ExcludeNodes, and Strict*Nodes
  20271. options. Previously, we had been ambiguous in describing what
  20272. counted as an "exit" node, and what operations exactly "StrictNodes
  20273. 0" would permit. This created confusion when people saw nodes built
  20274. through unexpected circuits, and made it hard to tell real bugs from
  20275. surprises. Now the intended behavior is:
  20276. . "Exit", in the context of ExitNodes and ExcludeExitNodes, means
  20277. a node that delivers user traffic outside the Tor network.
  20278. . "Entry", in the context of EntryNodes, means a node used as the
  20279. first hop of a multihop circuit. It doesn't include direct
  20280. connections to directory servers.
  20281. . "ExcludeNodes" applies to all nodes.
  20282. . "StrictNodes" changes the behavior of ExcludeNodes only. When
  20283. StrictNodes is set, Tor should avoid all nodes listed in
  20284. ExcludeNodes, even when it will make user requests fail. When
  20285. StrictNodes is *not* set, then Tor should follow ExcludeNodes
  20286. whenever it can, except when it must use an excluded node to
  20287. perform self-tests, connect to a hidden service, provide a
  20288. hidden service, fulfill a .exit request, upload directory
  20289. information, or fetch directory information.
  20290. Collectively, the changes to implement the behavior fix bug 1090.
  20291. - If EntryNodes, ExitNodes, ExcludeNodes, or ExcludeExitNodes
  20292. change during a config reload, mark and discard all our origin
  20293. circuits. This fix should address edge cases where we change the
  20294. config options and but then choose a circuit that we created before
  20295. the change.
  20296. - Make EntryNodes config option much more aggressive even when
  20297. StrictNodes is not set. Before it would prepend your requested
  20298. entrynodes to your list of guard nodes, but feel free to use others
  20299. after that. Now it chooses only from your EntryNodes if any of
  20300. those are available, and only falls back to others if a) they're
  20301. all down and b) StrictNodes is not set.
  20302. - Now we refresh your entry guards from EntryNodes at each consensus
  20303. fetch -- rather than just at startup and then they slowly rot as
  20304. the network changes.
  20305. - Add support for the country code "{??}" in torrc options like
  20306. ExcludeNodes, to indicate all routers of unknown country. Closes
  20307. bug 1094.
  20308. - ExcludeNodes now takes precedence over EntryNodes and ExitNodes: if
  20309. a node is listed in both, it's treated as excluded.
  20310. - ExcludeNodes now applies to directory nodes -- as a preference if
  20311. StrictNodes is 0, or an absolute requirement if StrictNodes is 1.
  20312. Don't exclude all the directory authorities and set StrictNodes to 1
  20313. unless you really want your Tor to break.
  20314. - ExcludeNodes and ExcludeExitNodes now override exit enclaving.
  20315. - ExcludeExitNodes now overrides .exit requests.
  20316. - We don't use bridges listed in ExcludeNodes.
  20317. - When StrictNodes is 1:
  20318. . We now apply ExcludeNodes to hidden service introduction points
  20319. and to rendezvous points selected by hidden service users. This
  20320. can make your hidden service less reliable: use it with caution!
  20321. . If we have used ExcludeNodes on ourself, do not try relay
  20322. reachability self-tests.
  20323. . If we have excluded all the directory authorities, we will not
  20324. even try to upload our descriptor if we're a relay.
  20325. . Do not honor .exit requests to an excluded node.
  20326. - When the set of permitted nodes changes, we now remove any mappings
  20327. introduced via TrackExitHosts to now-excluded nodes. Bugfix on
  20328. 0.1.0.1-rc.
  20329. - We never cannibalize a circuit that had excluded nodes on it, even
  20330. if StrictNodes is 0. Bugfix on 0.1.0.1-rc.
  20331. - Improve log messages related to excluded nodes.
  20332. o Major features (misc):
  20333. - Numerous changes, bugfixes, and workarounds from Nathan Freitas
  20334. to help Tor build correctly for Android phones.
  20335. - The options SocksPort, ControlPort, and so on now all accept a
  20336. value "auto" that opens a socket on an OS-selected port. A
  20337. new ControlPortWriteToFile option tells Tor to write its
  20338. actual control port or ports to a chosen file. If the option
  20339. ControlPortFileGroupReadable is set, the file is created as
  20340. group-readable. Now users can run two Tor clients on the same
  20341. system without needing to manually mess with parameters. Resolves
  20342. part of ticket 3076.
  20343. - Tor now supports tunneling all of its outgoing connections over
  20344. a SOCKS proxy, using the SOCKS4Proxy and/or SOCKS5Proxy
  20345. configuration options. Code by Christopher Davis.
  20346. o Code security improvements:
  20347. - Replace all potentially sensitive memory comparison operations
  20348. with versions whose runtime does not depend on the data being
  20349. compared. This will help resist a class of attacks where an
  20350. adversary can use variations in timing information to learn
  20351. sensitive data. Fix for one case of bug 3122. (Safe memcmp
  20352. implementation by Robert Ransom based partially on code by DJB.)
  20353. - Enable Address Space Layout Randomization (ASLR) and Data Execution
  20354. Prevention (DEP) by default on Windows to make it harder for
  20355. attackers to exploit vulnerabilities. Patch from John Brooks.
  20356. - New "--enable-gcc-hardening" ./configure flag (off by default)
  20357. to turn on gcc compile time hardening options. It ensures
  20358. that signed ints have defined behavior (-fwrapv), enables
  20359. -D_FORTIFY_SOURCE=2 (requiring -O2), adds stack smashing protection
  20360. with canaries (-fstack-protector-all), turns on ASLR protection if
  20361. supported by the kernel (-fPIE, -pie), and adds additional security
  20362. related warnings. Verified to work on Mac OS X and Debian Lenny.
  20363. - New "--enable-linker-hardening" ./configure flag (off by default)
  20364. to turn on ELF specific hardening features (relro, now). This does
  20365. not work with Mac OS X or any other non-ELF binary format.
  20366. - Always search the Windows system directory for system DLLs, and
  20367. nowhere else. Bugfix on 0.1.1.23; fixes bug 1954.
  20368. - New DisableAllSwap option. If set to 1, Tor will attempt to lock all
  20369. current and future memory pages via mlockall(). On supported
  20370. platforms (modern Linux and probably BSD but not Windows or OS X),
  20371. this should effectively disable any and all attempts to page out
  20372. memory. This option requires that you start your Tor as root --
  20373. if you use DisableAllSwap, please consider using the User option
  20374. to properly reduce the privileges of your Tor.
  20375. o Major bugfixes (crashes):
  20376. - Fix crash bug on platforms where gmtime and localtime can return
  20377. NULL. Windows 7 users were running into this one. Fixes part of bug
  20378. 2077. Bugfix on all versions of Tor. Found by boboper.
  20379. - Introduce minimum/maximum values that clients will believe
  20380. from the consensus. Now we'll have a better chance to avoid crashes
  20381. or worse when a consensus param has a weird value.
  20382. - Fix a rare crash bug that could occur when a client was configured
  20383. with a large number of bridges. Fixes bug 2629; bugfix on
  20384. 0.2.1.2-alpha. Bugfix by trac user "shitlei".
  20385. - Do not crash when our configuration file becomes unreadable, for
  20386. example due to a permissions change, between when we start up
  20387. and when a controller calls SAVECONF. Fixes bug 3135; bugfix
  20388. on 0.0.9pre6.
  20389. - If we're in the pathological case where there's no exit bandwidth
  20390. but there is non-exit bandwidth, or no guard bandwidth but there
  20391. is non-guard bandwidth, don't crash during path selection. Bugfix
  20392. on 0.2.0.3-alpha.
  20393. - Fix a crash bug when trying to initialize the evdns module in
  20394. Libevent 2. Bugfix on 0.2.1.16-rc.
  20395. o Major bugfixes (stability):
  20396. - Fix an assert in parsing router descriptors containing IPv6
  20397. addresses. This one took down the directory authorities when
  20398. somebody tried some experimental code. Bugfix on 0.2.1.3-alpha.
  20399. - Fix an uncommon assertion failure when running with DNSPort under
  20400. heavy load. Fixes bug 2933; bugfix on 0.2.0.1-alpha.
  20401. - Treat an unset $HOME like an empty $HOME rather than triggering an
  20402. assert. Bugfix on 0.0.8pre1; fixes bug 1522.
  20403. - More gracefully handle corrupt state files, removing asserts
  20404. in favor of saving a backup and resetting state.
  20405. - Instead of giving an assertion failure on an internal mismatch
  20406. on estimated freelist size, just log a BUG warning and try later.
  20407. Mitigates but does not fix bug 1125.
  20408. - Fix an assert that got triggered when using the TestingTorNetwork
  20409. configuration option and then issuing a GETINFO config-text control
  20410. command. Fixes bug 2250; bugfix on 0.2.1.2-alpha.
  20411. - If the cached cert file is unparseable, warn but don't exit.
  20412. o Privacy fixes (relays/bridges):
  20413. - Don't list Windows capabilities in relay descriptors. We never made
  20414. use of them, and maybe it's a bad idea to publish them. Bugfix
  20415. on 0.1.1.8-alpha.
  20416. - If the Nickname configuration option isn't given, Tor would pick a
  20417. nickname based on the local hostname as the nickname for a relay.
  20418. Because nicknames are not very important in today's Tor and the
  20419. "Unnamed" nickname has been implemented, this is now problematic
  20420. behavior: It leaks information about the hostname without being
  20421. useful at all. Fixes bug 2979; bugfix on 0.1.2.2-alpha, which
  20422. introduced the Unnamed nickname. Reported by tagnaq.
  20423. - Maintain separate TLS contexts and certificates for incoming and
  20424. outgoing connections in bridge relays. Previously we would use the
  20425. same TLS contexts and certs for incoming and outgoing connections.
  20426. Bugfix on 0.2.0.3-alpha; addresses bug 988.
  20427. - Maintain separate identity keys for incoming and outgoing TLS
  20428. contexts in bridge relays. Previously we would use the same
  20429. identity keys for incoming and outgoing TLS contexts. Bugfix on
  20430. 0.2.0.3-alpha; addresses the other half of bug 988.
  20431. - Make the bridge directory authority refuse to answer directory
  20432. requests for "all descriptors". It used to include bridge
  20433. descriptors in its answer, which was a major information leak.
  20434. Found by "piebeer". Bugfix on 0.2.0.3-alpha.
  20435. o Privacy fixes (clients):
  20436. - When receiving a hidden service descriptor, check that it is for
  20437. the hidden service we wanted. Previously, Tor would store any
  20438. hidden service descriptors that a directory gave it, whether it
  20439. wanted them or not. This wouldn't have let an attacker impersonate
  20440. a hidden service, but it did let directories pre-seed a client
  20441. with descriptors that it didn't want. Bugfix on 0.0.6.
  20442. - Start the process of disabling ".exit" address notation, since it
  20443. can be used for a variety of esoteric application-level attacks
  20444. on users. To reenable it, set "AllowDotExit 1" in your torrc. Fix
  20445. on 0.0.9rc5.
  20446. - Reject attempts at the client side to open connections to private
  20447. IP addresses (like 127.0.0.1, 10.0.0.1, and so on) with
  20448. a randomly chosen exit node. Attempts to do so are always
  20449. ill-defined, generally prevented by exit policies, and usually
  20450. in error. This will also help to detect loops in transparent
  20451. proxy configurations. You can disable this feature by setting
  20452. "ClientRejectInternalAddresses 0" in your torrc.
  20453. - Log a notice when we get a new control connection. Now it's easier
  20454. for security-conscious users to recognize when a local application
  20455. is knocking on their controller door. Suggested by bug 1196.
  20456. o Privacy fixes (newnym):
  20457. - Avoid linkability based on cached hidden service descriptors: forget
  20458. all hidden service descriptors cached as a client when processing a
  20459. SIGNAL NEWNYM command. Fixes bug 3000; bugfix on 0.0.6.
  20460. - On SIGHUP, do not clear out all TrackHostExits mappings, client
  20461. DNS cache entries, and virtual address mappings: that's what
  20462. NEWNYM is for. Fixes bug 1345; bugfix on 0.1.0.1-rc.
  20463. - Don't attach new streams to old rendezvous circuits after SIGNAL
  20464. NEWNYM. Previously, we would keep using an existing rendezvous
  20465. circuit if it remained open (i.e. if it were kept open by a
  20466. long-lived stream, or if a new stream were attached to it before
  20467. Tor could notice that it was old and no longer in use). Bugfix on
  20468. 0.1.1.15-rc; fixes bug 3375.
  20469. o Major bugfixes (relay bandwidth accounting):
  20470. - Fix a bug that could break accounting on 64-bit systems with large
  20471. time_t values, making them hibernate for impossibly long intervals.
  20472. Fixes bug 2146. Bugfix on 0.0.9pre6; fix by boboper.
  20473. - Fix a bug in bandwidth accounting that could make us use twice
  20474. the intended bandwidth when our interval start changes due to
  20475. daylight saving time. Now we tolerate skew in stored vs computed
  20476. interval starts: if the start of the period changes by no more than
  20477. 50% of the period's duration, we remember bytes that we transferred
  20478. in the old period. Fixes bug 1511; bugfix on 0.0.9pre5.
  20479. o Major bugfixes (bridges):
  20480. - Bridges now use "reject *:*" as their default exit policy. Bugfix
  20481. on 0.2.0.3-alpha. Fixes bug 1113.
  20482. - If you configure your bridge with a known identity fingerprint,
  20483. and the bridge authority is unreachable (as it is in at least
  20484. one country now), fall back to directly requesting the descriptor
  20485. from the bridge. Finishes the feature started in 0.2.0.10-alpha;
  20486. closes bug 1138.
  20487. - Fix a bug where bridge users who configure the non-canonical
  20488. address of a bridge automatically switch to its canonical
  20489. address. If a bridge listens at more than one address, it
  20490. should be able to advertise those addresses independently and
  20491. any non-blocked addresses should continue to work. Bugfix on Tor
  20492. 0.2.0.3-alpha. Fixes bug 2510.
  20493. - If you configure Tor to use bridge A, and then quit and
  20494. configure Tor to use bridge B instead (or if you change Tor
  20495. to use bridge B via the controller), it would happily continue
  20496. to use bridge A if it's still reachable. While this behavior is
  20497. a feature if your goal is connectivity, in some scenarios it's a
  20498. dangerous bug. Bugfix on Tor 0.2.0.1-alpha; fixes bug 2511.
  20499. - When the controller configures a new bridge, don't wait 10 to 60
  20500. seconds before trying to fetch its descriptor. Bugfix on
  20501. 0.2.0.3-alpha; fixes bug 3198 (suggested by 2355).
  20502. o Major bugfixes (directory authorities):
  20503. - Many relays have been falling out of the consensus lately because
  20504. not enough authorities know about their descriptor for them to get
  20505. a majority of votes. When we deprecated the v2 directory protocol,
  20506. we got rid of the only way that v3 authorities can hear from each
  20507. other about other descriptors. Now authorities examine every v3
  20508. vote for new descriptors, and fetch them from that authority. Bugfix
  20509. on 0.2.1.23.
  20510. - Authorities could be tricked into giving out the Exit flag to relays
  20511. that didn't allow exiting to any ports. This bug could screw
  20512. with load balancing and stats. Bugfix on 0.1.1.6-alpha; fixes bug
  20513. 1238. Bug discovered by Martin Kowalczyk.
  20514. - If all authorities restart at once right before a consensus vote,
  20515. nobody will vote about "Running", and clients will get a consensus
  20516. with no usable relays. Instead, authorities refuse to build a
  20517. consensus if this happens. Bugfix on 0.2.0.10-alpha; fixes bug 1066.
  20518. o Major bugfixes (stream-level fairness):
  20519. - When receiving a circuit-level SENDME for a blocked circuit, try
  20520. to package cells fairly from all the streams that had previously
  20521. been blocked on that circuit. Previously, we had started with the
  20522. oldest stream, and allowed each stream to potentially exhaust
  20523. the circuit's package window. This gave older streams on any
  20524. given circuit priority over newer ones. Fixes bug 1937. Detected
  20525. originally by Camilo Viecco. This bug was introduced before the
  20526. first Tor release, in svn commit r152: it is the new winner of
  20527. the longest-lived bug prize.
  20528. - Fix a stream fairness bug that would cause newer streams on a given
  20529. circuit to get preference when reading bytes from the origin or
  20530. destination. Fixes bug 2210. Fix by Mashael AlSabah. This bug was
  20531. introduced before the first Tor release, in svn revision r152.
  20532. - When the exit relay got a circuit-level sendme cell, it started
  20533. reading on the exit streams, even if had 500 cells queued in the
  20534. circuit queue already, so the circuit queue just grew and grew in
  20535. some cases. We fix this by not re-enabling reading on receipt of a
  20536. sendme cell when the cell queue is blocked. Fixes bug 1653. Bugfix
  20537. on 0.2.0.1-alpha. Detected by Mashael AlSabah. Original patch by
  20538. "yetonetime".
  20539. - Newly created streams were allowed to read cells onto circuits,
  20540. even if the circuit's cell queue was blocked and waiting to drain.
  20541. This created potential unfairness, as older streams would be
  20542. blocked, but newer streams would gladly fill the queue completely.
  20543. We add code to detect this situation and prevent any stream from
  20544. getting more than one free cell. Bugfix on 0.2.0.1-alpha. Partially
  20545. fixes bug 1298.
  20546. o Major bugfixes (hidden services):
  20547. - Apply circuit timeouts to opened hidden-service-related circuits
  20548. based on the correct start time. Previously, we would apply the
  20549. circuit build timeout based on time since the circuit's creation;
  20550. it was supposed to be applied based on time since the circuit
  20551. entered its current state. Bugfix on 0.0.6; fixes part of bug 1297.
  20552. - Improve hidden service robustness: When we find that we have
  20553. extended a hidden service's introduction circuit to a relay not
  20554. listed as an introduction point in the HS descriptor we currently
  20555. have, retry with an introduction point from the current
  20556. descriptor. Previously we would just give up. Fixes bugs 1024 and
  20557. 1930; bugfix on 0.2.0.10-alpha.
  20558. - Directory authorities now use data collected from their own
  20559. uptime observations when choosing whether to assign the HSDir flag
  20560. to relays, instead of trusting the uptime value the relay reports in
  20561. its descriptor. This change helps prevent an attack where a small
  20562. set of nodes with frequently-changing identity keys can blackhole
  20563. a hidden service. (Only authorities need upgrade; others will be
  20564. fine once they do.) Bugfix on 0.2.0.10-alpha; fixes bug 2709.
  20565. - Stop assigning the HSDir flag to relays that disable their
  20566. DirPort (and thus will refuse to answer directory requests). This
  20567. fix should dramatically improve the reachability of hidden services:
  20568. hidden services and hidden service clients pick six HSDir relays
  20569. to store and retrieve the hidden service descriptor, and currently
  20570. about half of the HSDir relays will refuse to work. Bugfix on
  20571. 0.2.0.10-alpha; fixes part of bug 1693.
  20572. o Major bugfixes (misc):
  20573. - Clients now stop trying to use an exit node associated with a given
  20574. destination by TrackHostExits if they fail to reach that exit node.
  20575. Fixes bug 2999. Bugfix on 0.2.0.20-rc.
  20576. - Fix a regression that caused Tor to rebind its ports if it receives
  20577. SIGHUP while hibernating. Bugfix in 0.1.1.6-alpha; closes bug 919.
  20578. - Remove an extra pair of quotation marks around the error
  20579. message in control-port STATUS_GENERAL BUG events. Bugfix on
  20580. 0.1.2.6-alpha; fixes bug 3732.
  20581. o Minor features (relays):
  20582. - Ensure that no empty [dirreq-](read|write)-history lines are added
  20583. to an extrainfo document. Implements ticket 2497.
  20584. - When bandwidth accounting is enabled, be more generous with how
  20585. much bandwidth we'll use up before entering "soft hibernation".
  20586. Previously, we'd refuse new connections and circuits once we'd
  20587. used up 95% of our allotment. Now, we use up 95% of our allotment,
  20588. AND make sure that we have no more than 500MB (or 3 hours of
  20589. expected traffic, whichever is lower) remaining before we enter
  20590. soft hibernation.
  20591. - Relays now log the reason for publishing a new relay descriptor,
  20592. so we have a better chance of hunting down instances of bug 1810.
  20593. Resolves ticket 3252.
  20594. - Log a little more clearly about the times at which we're no longer
  20595. accepting new connections (e.g. due to hibernating). Resolves
  20596. bug 2181.
  20597. - When AllowSingleHopExits is set, print a warning to explain to the
  20598. relay operator why most clients are avoiding her relay.
  20599. - Send END_STREAM_REASON_NOROUTE in response to EHOSTUNREACH errors.
  20600. Clients before 0.2.1.27 didn't handle NOROUTE correctly, but such
  20601. clients are already deprecated because of security bugs.
  20602. o Minor features (network statistics):
  20603. - Directory mirrors that set "DirReqStatistics 1" write statistics
  20604. about directory requests to disk every 24 hours. As compared to the
  20605. "--enable-geoip-stats" ./configure flag in 0.2.1.x, there are a few
  20606. improvements: 1) stats are written to disk exactly every 24 hours;
  20607. 2) estimated shares of v2 and v3 requests are determined as mean
  20608. values, not at the end of a measurement period; 3) unresolved
  20609. requests are listed with country code '??'; 4) directories also
  20610. measure download times.
  20611. - Exit nodes that set "ExitPortStatistics 1" write statistics on the
  20612. number of exit streams and transferred bytes per port to disk every
  20613. 24 hours.
  20614. - Relays that set "CellStatistics 1" write statistics on how long
  20615. cells spend in their circuit queues to disk every 24 hours.
  20616. - Entry nodes that set "EntryStatistics 1" write statistics on the
  20617. rough number and origins of connecting clients to disk every 24
  20618. hours.
  20619. - Relays that write any of the above statistics to disk and set
  20620. "ExtraInfoStatistics 1" include the past 24 hours of statistics in
  20621. their extra-info documents. Implements proposal 166.
  20622. o Minor features (GeoIP and statistics):
  20623. - Provide a log message stating which geoip file we're parsing
  20624. instead of just stating that we're parsing the geoip file.
  20625. Implements ticket 2432.
  20626. - Make sure every relay writes a state file at least every 12 hours.
  20627. Previously, a relay could go for weeks without writing its state
  20628. file, and on a crash could lose its bandwidth history, capacity
  20629. estimates, client country statistics, and so on. Addresses bug 3012.
  20630. - Relays report the number of bytes spent on answering directory
  20631. requests in extra-info descriptors similar to {read,write}-history.
  20632. Implements enhancement 1790.
  20633. - Report only the top 10 ports in exit-port stats in order not to
  20634. exceed the maximum extra-info descriptor length of 50 KB. Implements
  20635. task 2196.
  20636. - If writing the state file to disk fails, wait up to an hour before
  20637. retrying again, rather than trying again each second. Fixes bug
  20638. 2346; bugfix on Tor 0.1.1.3-alpha.
  20639. - Delay geoip stats collection by bridges for 6 hours, not 2 hours,
  20640. when we switch from being a public relay to a bridge. Otherwise
  20641. there will still be clients that see the relay in their consensus,
  20642. and the stats will end up wrong. Bugfix on 0.2.1.15-rc; fixes
  20643. bug 932.
  20644. - Update to the August 2 2011 Maxmind GeoLite Country database.
  20645. o Minor features (clients):
  20646. - When expiring circuits, use microsecond timers rather than
  20647. one-second timers. This can avoid an unpleasant situation where a
  20648. circuit is launched near the end of one second and expired right
  20649. near the beginning of the next, and prevent fluctuations in circuit
  20650. timeout values.
  20651. - If we've configured EntryNodes and our network goes away and/or all
  20652. our entrynodes get marked down, optimistically retry them all when
  20653. a new socks application request appears. Fixes bug 1882.
  20654. - Always perform router selections using weighted relay bandwidth,
  20655. even if we don't need a high capacity circuit at the time. Non-fast
  20656. circuits now only differ from fast ones in that they can use relays
  20657. not marked with the Fast flag. This "feature" could turn out to
  20658. be a horrible bug; we should investigate more before it goes into
  20659. a stable release.
  20660. - When we run out of directory information such that we can't build
  20661. circuits, but then get enough that we can build circuits, log when
  20662. we actually construct a circuit, so the user has a better chance of
  20663. knowing what's going on. Fixes bug 1362.
  20664. - Log SSL state transitions at debug level during handshake, and
  20665. include SSL states in error messages. This may help debug future
  20666. SSL handshake issues.
  20667. o Minor features (directory authorities):
  20668. - When a router changes IP address or port, authorities now launch
  20669. a new reachability test for it. Implements ticket 1899.
  20670. - Directory authorities now reject relays running any versions of
  20671. Tor between 0.2.1.3-alpha and 0.2.1.18 inclusive; they have
  20672. known bugs that keep RELAY_EARLY cells from working on rendezvous
  20673. circuits. Followup to fix for bug 2081.
  20674. - Directory authorities now reject relays running any version of Tor
  20675. older than 0.2.0.26-rc. That version is the earliest that fetches
  20676. current directory information correctly. Fixes bug 2156.
  20677. - Directory authorities now do an immediate reachability check as soon
  20678. as they hear about a new relay. This change should slightly reduce
  20679. the time between setting up a relay and getting listed as running
  20680. in the consensus. It should also improve the time between setting
  20681. up a bridge and seeing use by bridge users.
  20682. - Directory authorities no longer launch a TLS connection to every
  20683. relay as they startup. Now that we have 2k+ descriptors cached,
  20684. the resulting network hiccup is becoming a burden. Besides,
  20685. authorities already avoid voting about Running for the first half
  20686. hour of their uptime.
  20687. - Directory authorities now log the source of a rejected POSTed v3
  20688. networkstatus vote, so we can track failures better.
  20689. - Backport code from 0.2.3.x that allows directory authorities to
  20690. clean their microdescriptor caches. Needed to resolve bug 2230.
  20691. o Minor features (hidden services):
  20692. - Use computed circuit-build timeouts to decide when to launch
  20693. parallel introduction circuits for hidden services. (Previously,
  20694. we would retry after 15 seconds.)
  20695. - Don't allow v0 hidden service authorities to act as clients.
  20696. Required by fix for bug 3000.
  20697. - Ignore SIGNAL NEWNYM commands on relay-only Tor instances. Required
  20698. by fix for bug 3000.
  20699. - Make hidden services work better in private Tor networks by not
  20700. requiring any uptime to join the hidden service descriptor
  20701. DHT. Implements ticket 2088.
  20702. - Log (at info level) when purging pieces of hidden-service-client
  20703. state because of SIGNAL NEWNYM.
  20704. o Minor features (controller interface):
  20705. - New "GETINFO net/listeners/(type)" controller command to return
  20706. a list of addresses and ports that are bound for listeners for a
  20707. given connection type. This is useful when the user has configured
  20708. "SocksPort auto" and the controller needs to know which port got
  20709. chosen. Resolves another part of ticket 3076.
  20710. - Have the controller interface give a more useful message than
  20711. "Internal Error" in response to failed GETINFO requests.
  20712. - Add a TIMEOUT_RATE keyword to the BUILDTIMEOUT_SET control port
  20713. event, to give information on the current rate of circuit timeouts
  20714. over our stored history.
  20715. - The 'EXTENDCIRCUIT' control port command can now be used with
  20716. a circ id of 0 and no path. This feature will cause Tor to build
  20717. a new 'fast' general purpose circuit using its own path selection
  20718. algorithms.
  20719. - Added a BUILDTIMEOUT_SET controller event to describe changes
  20720. to the circuit build timeout.
  20721. - New controller command "getinfo config-text". It returns the
  20722. contents that Tor would write if you send it a SAVECONF command,
  20723. so the controller can write the file to disk itself.
  20724. o Minor features (controller protocol):
  20725. - Add a new ControlSocketsGroupWritable configuration option: when
  20726. it is turned on, ControlSockets are group-writeable by the default
  20727. group of the current user. Patch by Jérémy Bobbio; implements
  20728. ticket 2972.
  20729. - Tor now refuses to create a ControlSocket in a directory that is
  20730. world-readable (or group-readable if ControlSocketsGroupWritable
  20731. is 0). This is necessary because some operating systems do not
  20732. enforce permissions on an AF_UNIX sockets. Permissions on the
  20733. directory holding the socket, however, seems to work everywhere.
  20734. - Warn when CookieAuthFileGroupReadable is set but CookieAuthFile is
  20735. not. This would lead to a cookie that is still not group readable.
  20736. Closes bug 1843. Suggested by katmagic.
  20737. - Future-proof the controller protocol a bit by ignoring keyword
  20738. arguments we do not recognize.
  20739. o Minor features (more useful logging):
  20740. - Revise most log messages that refer to nodes by nickname to
  20741. instead use the "$key=nickname at address" format. This should be
  20742. more useful, especially since nicknames are less and less likely
  20743. to be unique. Resolves ticket 3045.
  20744. - When an HTTPS proxy reports "403 Forbidden", we now explain
  20745. what it means rather than calling it an unexpected status code.
  20746. Closes bug 2503. Patch from Michael Yakubovich.
  20747. - Rate-limit a warning about failures to download v2 networkstatus
  20748. documents. Resolves part of bug 1352.
  20749. - Rate-limit the "your application is giving Tor only an IP address"
  20750. warning. Addresses bug 2000; bugfix on 0.0.8pre2.
  20751. - Rate-limit "Failed to hand off onionskin" warnings.
  20752. - When logging a rate-limited warning, we now mention how many messages
  20753. got suppressed since the last warning.
  20754. - Make the formerly ugly "2 unknown, 7 missing key, 0 good, 0 bad,
  20755. 2 no signature, 4 required" messages about consensus signatures
  20756. easier to read, and make sure they get logged at the same severity
  20757. as the messages explaining which keys are which. Fixes bug 1290.
  20758. - Don't warn when we have a consensus that we can't verify because
  20759. of missing certificates, unless those certificates are ones
  20760. that we have been trying and failing to download. Fixes bug 1145.
  20761. o Minor features (log domains):
  20762. - Add documentation for configuring logging at different severities in
  20763. different log domains. We've had this feature since 0.2.1.1-alpha,
  20764. but for some reason it never made it into the manpage. Fixes
  20765. bug 2215.
  20766. - Make it simpler to specify "All log domains except for A and B".
  20767. Previously you needed to say "[*,~A,~B]". Now you can just say
  20768. "[~A,~B]".
  20769. - Add a "LogMessageDomains 1" option to include the domains of log
  20770. messages along with the messages. Without this, there's no way
  20771. to use log domains without reading the source or doing a lot
  20772. of guessing.
  20773. - Add a new "Handshake" log domain for activities that happen
  20774. during the TLS handshake.
  20775. o Minor features (build process):
  20776. - Make compilation with clang possible when using
  20777. "--enable-gcc-warnings" by removing two warning options that clang
  20778. hasn't implemented yet and by fixing a few warnings. Resolves
  20779. ticket 2696.
  20780. - Detect platforms that brokenly use a signed size_t, and refuse to
  20781. build there. Found and analyzed by doorss and rransom.
  20782. - Fix a bunch of compile warnings revealed by mingw with gcc 4.5.
  20783. Resolves bug 2314.
  20784. - Add support for statically linking zlib by specifying
  20785. "--enable-static-zlib", to go with our support for statically
  20786. linking openssl and libevent. Resolves bug 1358.
  20787. - Instead of adding the svn revision to the Tor version string, report
  20788. the git commit (when we're building from a git checkout).
  20789. - Rename the "log.h" header to "torlog.h" so as to conflict with fewer
  20790. system headers.
  20791. - New --digests command-line switch to output the digests of the
  20792. source files Tor was built with.
  20793. - Generate our manpage and HTML documentation using Asciidoc. This
  20794. change should make it easier to maintain the documentation, and
  20795. produce nicer HTML. The build process fails if asciidoc cannot
  20796. be found and building with asciidoc isn't disabled (via the
  20797. "--disable-asciidoc" argument to ./configure. Skipping the manpage
  20798. speeds up the build considerably.
  20799. o Minor features (options / torrc):
  20800. - Warn when the same option is provided more than once in a torrc
  20801. file, on the command line, or in a single SETCONF statement, and
  20802. the option is one that only accepts a single line. Closes bug 1384.
  20803. - Warn when the user configures two HiddenServiceDir lines that point
  20804. to the same directory. Bugfix on 0.0.6 (the version introducing
  20805. HiddenServiceDir); fixes bug 3289.
  20806. - Add new "perconnbwrate" and "perconnbwburst" consensus params to
  20807. do individual connection-level rate limiting of clients. The torrc
  20808. config options with the same names trump the consensus params, if
  20809. both are present. Replaces the old "bwconnrate" and "bwconnburst"
  20810. consensus params which were broken from 0.2.2.7-alpha through
  20811. 0.2.2.14-alpha. Closes bug 1947.
  20812. - New config option "WarnUnsafeSocks 0" disables the warning that
  20813. occurs whenever Tor receives a socks handshake using a version of
  20814. the socks protocol that can only provide an IP address (rather
  20815. than a hostname). Setups that do DNS locally over Tor are fine,
  20816. and we shouldn't spam the logs in that case.
  20817. - New config option "CircuitStreamTimeout" to override our internal
  20818. timeout schedule for how many seconds until we detach a stream from
  20819. a circuit and try a new circuit. If your network is particularly
  20820. slow, you might want to set this to a number like 60.
  20821. - New options for SafeLogging to allow scrubbing only log messages
  20822. generated while acting as a relay. Specify "SafeLogging relay" if
  20823. you want to ensure that only messages known to originate from
  20824. client use of the Tor process will be logged unsafely.
  20825. - Time and memory units in the configuration file can now be set to
  20826. fractional units. For example, "2.5 GB" is now a valid value for
  20827. AccountingMax.
  20828. - Support line continuations in the torrc config file. If a line
  20829. ends with a single backslash character, the newline is ignored, and
  20830. the configuration value is treated as continuing on the next line.
  20831. Resolves bug 1929.
  20832. o Minor features (unit tests):
  20833. - Revise our unit tests to use the "tinytest" framework, so we
  20834. can run tests in their own processes, have smarter setup/teardown
  20835. code, and so on. The unit test code has moved to its own
  20836. subdirectory, and has been split into multiple modules.
  20837. - Add a unit test for cross-platform directory-listing code.
  20838. - Add some forgotten return value checks during unit tests. Found
  20839. by coverity.
  20840. - Use GetTempDir to find the proper temporary directory location on
  20841. Windows when generating temporary files for the unit tests. Patch
  20842. by Gisle Vanem.
  20843. o Minor features (misc):
  20844. - The "torify" script now uses torsocks where available.
  20845. - Make Libevent log messages get delivered to controllers later,
  20846. and not from inside the Libevent log handler. This prevents unsafe
  20847. reentrant Libevent calls while still letting the log messages
  20848. get through.
  20849. - Certain Tor clients (such as those behind check.torproject.org) may
  20850. want to fetch the consensus in an extra early manner. To enable this
  20851. a user may now set FetchDirInfoExtraEarly to 1. This also depends on
  20852. setting FetchDirInfoEarly to 1. Previous behavior will stay the same
  20853. as only certain clients who must have this information sooner should
  20854. set this option.
  20855. - Expand homedirs passed to tor-checkkey. This should silence a
  20856. coverity complaint about passing a user-supplied string into
  20857. open() without checking it.
  20858. - Make sure to disable DirPort if running as a bridge. DirPorts aren't
  20859. used on bridges, and it makes bridge scanning somewhat easier.
  20860. - Create the /var/run/tor directory on startup on OpenSUSE if it is
  20861. not already created. Patch from Andreas Stieger. Fixes bug 2573.
  20862. o Minor bugfixes (relays):
  20863. - When a relay decides that its DNS is too broken for it to serve
  20864. as an exit server, it advertised itself as a non-exit, but
  20865. continued to act as an exit. This could create accidental
  20866. partitioning opportunities for users. Instead, if a relay is
  20867. going to advertise reject *:* as its exit policy, it should
  20868. really act with exit policy "reject *:*". Fixes bug 2366.
  20869. Bugfix on Tor 0.1.2.5-alpha. Bugfix by user "postman" on trac.
  20870. - Publish a router descriptor even if generating an extra-info
  20871. descriptor fails. Previously we would not publish a router
  20872. descriptor without an extra-info descriptor; this can cause fast
  20873. exit relays collecting exit-port statistics to drop from the
  20874. consensus. Bugfix on 0.1.2.9-rc; fixes bug 2195.
  20875. - When we're trying to guess whether we know our IP address as
  20876. a relay, we would log various ways that we failed to guess
  20877. our address, but never log that we ended up guessing it
  20878. successfully. Now add a log line to help confused and anxious
  20879. relay operators. Bugfix on 0.1.2.1-alpha; fixes bug 1534.
  20880. - For bandwidth accounting, calculate our expected bandwidth rate
  20881. based on the time during which we were active and not in
  20882. soft-hibernation during the last interval. Previously, we were
  20883. also considering the time spent in soft-hibernation. If this
  20884. was a long time, we would wind up underestimating our bandwidth
  20885. by a lot, and skewing our wakeup time towards the start of the
  20886. accounting interval. Fixes bug 1789. Bugfix on 0.0.9pre5.
  20887. - Demote a confusing TLS warning that relay operators might get when
  20888. someone tries to talk to their ORPort. It is not the operator's
  20889. fault, nor can they do anything about it. Fixes bug 1364; bugfix
  20890. on 0.2.0.14-alpha.
  20891. - Change "Application request when we're believed to be offline."
  20892. notice to "Application request when we haven't used client
  20893. functionality lately.", to clarify that it's not an error. Bugfix
  20894. on 0.0.9.3; fixes bug 1222.
  20895. o Minor bugfixes (bridges):
  20896. - When a client starts or stops using bridges, never use a circuit
  20897. that was built before the configuration change. This behavior could
  20898. put at risk a user who uses bridges to ensure that her traffic
  20899. only goes to the chosen addresses. Bugfix on 0.2.0.3-alpha; fixes
  20900. bug 3200.
  20901. - Do not reset the bridge descriptor download status every time we
  20902. re-parse our configuration or get a configuration change. Fixes
  20903. bug 3019; bugfix on 0.2.0.3-alpha.
  20904. - Users couldn't configure a regular relay to be their bridge. It
  20905. didn't work because when Tor fetched the bridge descriptor, it found
  20906. that it already had it, and didn't realize that the purpose of the
  20907. descriptor had changed. Now we replace routers with a purpose other
  20908. than bridge with bridge descriptors when fetching them. Bugfix on
  20909. 0.1.1.9-alpha. Fixes bug 1776.
  20910. - In the special case where you configure a public exit relay as your
  20911. bridge, Tor would be willing to use that exit relay as the last
  20912. hop in your circuit as well. Now we fail that circuit instead.
  20913. Bugfix on 0.2.0.12-alpha. Fixes bug 2403. Reported by "piebeer".
  20914. o Minor bugfixes (clients):
  20915. - We now ask the other side of a stream (the client or the exit)
  20916. for more data on that stream when the amount of queued data on
  20917. that stream dips low enough. Previously, we wouldn't ask the
  20918. other side for more data until either it sent us more data (which
  20919. it wasn't supposed to do if it had exhausted its window!) or we
  20920. had completely flushed all our queued data. This flow control fix
  20921. should improve throughput. Fixes bug 2756; bugfix on the earliest
  20922. released versions of Tor (svn commit r152).
  20923. - When a client finds that an origin circuit has run out of 16-bit
  20924. stream IDs, we now mark it as unusable for new streams. Previously,
  20925. we would try to close the entire circuit. Bugfix on 0.0.6.
  20926. - Make it explicit that we don't cannibalize one-hop circuits. This
  20927. happens in the wild, but doesn't turn out to be a problem because
  20928. we fortunately don't use those circuits. Many thanks to outofwords
  20929. for the initial analysis and to swissknife who confirmed that
  20930. two-hop circuits are actually created.
  20931. - Resolve an edge case in path weighting that could make us misweight
  20932. our relay selection. Fixes bug 1203; bugfix on 0.0.8rc1.
  20933. - Make the DNSPort option work with libevent 2.x. Don't alter the
  20934. behavior for libevent 1.x. Fixes bug 1143. Found by SwissTorExit.
  20935. o Minor bugfixes (directory authorities):
  20936. - Make directory authorities more accurate at recording when
  20937. relays that have failed several reachability tests became
  20938. unreachable, so we can provide more accuracy at assigning Stable,
  20939. Guard, HSDir, etc flags. Bugfix on 0.2.0.6-alpha. Resolves bug 2716.
  20940. - Directory authorities are now more robust to hops back in time
  20941. when calculating router stability. Previously, if a run of uptime
  20942. or downtime appeared to be negative, the calculation could give
  20943. incorrect results. Bugfix on 0.2.0.6-alpha; noticed when fixing
  20944. bug 1035.
  20945. - Directory authorities will now attempt to download consensuses
  20946. if their own efforts to make a live consensus have failed. This
  20947. change means authorities that restart will fetch a valid
  20948. consensus, and it means authorities that didn't agree with the
  20949. current consensus will still fetch and serve it if it has enough
  20950. signatures. Bugfix on 0.2.0.9-alpha; fixes bug 1300.
  20951. - Never vote for a server as "Running" if we have a descriptor for
  20952. it claiming to be hibernating, and that descriptor was published
  20953. more recently than our last contact with the server. Bugfix on
  20954. 0.2.0.3-alpha; fixes bug 911.
  20955. - Directory authorities no longer change their opinion of, or vote on,
  20956. whether a router is Running, unless they have themselves been
  20957. online long enough to have some idea. Bugfix on 0.2.0.6-alpha.
  20958. Fixes bug 1023.
  20959. o Minor bugfixes (hidden services):
  20960. - Log malformed requests for rendezvous descriptors as protocol
  20961. warnings, not warnings. Also, use a more informative log message
  20962. in case someone sees it at log level warning without prior
  20963. info-level messages. Fixes bug 2748; bugfix on 0.2.0.10-alpha.
  20964. - Accept hidden service descriptors if we think we might be a hidden
  20965. service directory, regardless of what our consensus says. This
  20966. helps robustness, since clients and hidden services can sometimes
  20967. have a more up-to-date view of the network consensus than we do,
  20968. and if they think that the directory authorities list us a HSDir,
  20969. we might actually be one. Related to bug 2732; bugfix on
  20970. 0.2.0.10-alpha.
  20971. - Correct the warning displayed when a rendezvous descriptor exceeds
  20972. the maximum size. Fixes bug 2750; bugfix on 0.2.1.5-alpha. Found by
  20973. John Brooks.
  20974. - Clients and hidden services now use HSDir-flagged relays for hidden
  20975. service descriptor downloads and uploads even if the relays have no
  20976. DirPort set and the client has disabled TunnelDirConns. This will
  20977. eventually allow us to give the HSDir flag to relays with no
  20978. DirPort. Fixes bug 2722; bugfix on 0.2.1.6-alpha.
  20979. - Only limit the lengths of single HS descriptors, even when multiple
  20980. HS descriptors are published to an HSDir relay in a single POST
  20981. operation. Fixes bug 2948; bugfix on 0.2.1.5-alpha. Found by hsdir.
  20982. o Minor bugfixes (controllers):
  20983. - Allow GETINFO fingerprint to return a fingerprint even when
  20984. we have not yet built a router descriptor. Fixes bug 3577;
  20985. bugfix on 0.2.0.1-alpha.
  20986. - Send a SUCCEEDED stream event to the controller when a reverse
  20987. resolve succeeded. Fixes bug 3536; bugfix on 0.0.8pre1. Issue
  20988. discovered by katmagic.
  20989. - Remove a trailing asterisk from "exit-policy/default" in the
  20990. output of the control port command "GETINFO info/names". Bugfix
  20991. on 0.1.2.5-alpha.
  20992. - Make the SIGNAL DUMP controller command work on FreeBSD. Fixes bug
  20993. 2917. Bugfix on 0.1.1.1-alpha.
  20994. - When we restart our relay, we might get a successful connection
  20995. from the outside before we've started our reachability tests,
  20996. triggering a warning: "ORPort found reachable, but I have no
  20997. routerinfo yet. Failing to inform controller of success." This
  20998. bug was harmless unless Tor is running under a controller
  20999. like Vidalia, in which case the controller would never get a
  21000. REACHABILITY_SUCCEEDED status event. Bugfix on 0.1.2.6-alpha;
  21001. fixes bug 1172.
  21002. - When a controller changes TrackHostExits, remove mappings for
  21003. hosts that should no longer have their exits tracked. Bugfix on
  21004. 0.1.0.1-rc.
  21005. - When a controller changes VirtualAddrNetwork, remove any mappings
  21006. for hosts that were automapped to the old network. Bugfix on
  21007. 0.1.1.19-rc.
  21008. - When a controller changes one of the AutomapHosts* options, remove
  21009. any mappings for hosts that should no longer be automapped. Bugfix
  21010. on 0.2.0.1-alpha.
  21011. - Fix an off-by-one error in calculating some controller command
  21012. argument lengths. Fortunately, this mistake is harmless since
  21013. the controller code does redundant NUL termination too. Found by
  21014. boboper. Bugfix on 0.1.1.1-alpha.
  21015. - Fix a bug in the controller interface where "GETINFO ns/asdaskljkl"
  21016. would return "551 Internal error" rather than "552 Unrecognized key
  21017. ns/asdaskljkl". Bugfix on 0.1.2.3-alpha.
  21018. - Don't spam the controller with events when we have no file
  21019. descriptors available. Bugfix on 0.2.1.5-alpha. (Rate-limiting
  21020. for log messages was already solved from bug 748.)
  21021. - Emit a GUARD DROPPED controller event for a case we missed.
  21022. - Ensure DNS requests launched by "RESOLVE" commands from the
  21023. controller respect the __LeaveStreamsUnattached setconf options. The
  21024. same goes for requests launched via DNSPort or transparent
  21025. proxying. Bugfix on 0.2.0.1-alpha; fixes bug 1525.
  21026. o Minor bugfixes (config options):
  21027. - Tor used to limit HttpProxyAuthenticator values to 48 characters.
  21028. Change the limit to 512 characters by removing base64 newlines.
  21029. Fixes bug 2752. Fix by Michael Yakubovich.
  21030. - Complain if PublishServerDescriptor is given multiple arguments that
  21031. include 0 or 1. This configuration will be rejected in the future.
  21032. Bugfix on 0.2.0.1-alpha; closes bug 1107.
  21033. - Disallow BridgeRelay 1 and ORPort 0 at once in the configuration.
  21034. Bugfix on 0.2.0.13-alpha; closes bug 928.
  21035. o Minor bugfixes (log subsystem fixes):
  21036. - When unable to format an address as a string, report its value
  21037. as "???" rather than reusing the last formatted address. Bugfix
  21038. on 0.2.1.5-alpha.
  21039. - Be more consistent in our treatment of file system paths. "~" should
  21040. get expanded to the user's home directory in the Log config option.
  21041. Fixes bug 2971; bugfix on 0.2.0.1-alpha, which introduced the
  21042. feature for the -f and --DataDirectory options.
  21043. o Minor bugfixes (memory management):
  21044. - Don't stack-allocate the list of supplementary GIDs when we're
  21045. about to log them. Stack-allocating NGROUPS_MAX gid_t elements
  21046. could take up to 256K, which is way too much stack. Found by
  21047. Coverity; CID #450. Bugfix on 0.2.1.7-alpha.
  21048. - Save a couple bytes in memory allocation every time we escape
  21049. certain characters in a string. Patch from Florian Zumbiehl.
  21050. o Minor bugfixes (protocol correctness):
  21051. - When checking for 1024-bit keys, check for 1024 bits, not 128
  21052. bytes. This allows Tor to correctly discard keys of length 1017
  21053. through 1023. Bugfix on 0.0.9pre5.
  21054. - Require that introduction point keys and onion handshake keys
  21055. have a public exponent of 65537. Starts to fix bug 3207; bugfix
  21056. on 0.2.0.10-alpha.
  21057. - Handle SOCKS messages longer than 128 bytes long correctly, rather
  21058. than waiting forever for them to finish. Fixes bug 2330; bugfix
  21059. on 0.2.0.16-alpha. Found by doorss.
  21060. - Never relay a cell for a circuit we have already destroyed.
  21061. Between marking a circuit as closeable and finally closing it,
  21062. it may have been possible for a few queued cells to get relayed,
  21063. even though they would have been immediately dropped by the next
  21064. OR in the circuit. Fixes bug 1184; bugfix on 0.2.0.1-alpha.
  21065. - Never queue a cell for a circuit that's already been marked
  21066. for close.
  21067. - Fix a spec conformance issue: the network-status-version token
  21068. must be the first token in a v3 consensus or vote. Discovered by
  21069. "parakeep". Bugfix on 0.2.0.3-alpha.
  21070. - A networkstatus vote must contain exactly one signature. Spec
  21071. conformance issue. Bugfix on 0.2.0.3-alpha.
  21072. - When asked about a DNS record type we don't support via a
  21073. client DNSPort, reply with NOTIMPL rather than an empty
  21074. reply. Patch by intrigeri. Fixes bug 3369; bugfix on 2.0.1-alpha.
  21075. - Make more fields in the controller protocol case-insensitive, since
  21076. control-spec.txt said they were.
  21077. o Minor bugfixes (log messages):
  21078. - Fix a log message that said "bits" while displaying a value in
  21079. bytes. Found by wanoskarnet. Fixes bug 3318; bugfix on
  21080. 0.2.0.1-alpha.
  21081. - Downgrade "no current certificates known for authority" message from
  21082. Notice to Info. Fixes bug 2899; bugfix on 0.2.0.10-alpha.
  21083. - Correctly describe errors that occur when generating a TLS object.
  21084. Previously we would attribute them to a failure while generating a
  21085. TLS context. Patch by Robert Ransom. Bugfix on 0.1.0.4-rc; fixes
  21086. bug 1994.
  21087. - Fix an instance where a Tor directory mirror might accidentally
  21088. log the IP address of a misbehaving Tor client. Bugfix on
  21089. 0.1.0.1-rc.
  21090. - Stop logging at severity 'warn' when some other Tor client tries
  21091. to establish a circuit with us using weak DH keys. It's a protocol
  21092. violation, but that doesn't mean ordinary users need to hear about
  21093. it. Fixes the bug part of bug 1114. Bugfix on 0.1.0.13.
  21094. - If your relay can't keep up with the number of incoming create
  21095. cells, it would log one warning per failure into your logs. Limit
  21096. warnings to 1 per minute. Bugfix on 0.0.2pre10; fixes bug 1042.
  21097. o Minor bugfixes (build fixes):
  21098. - Fix warnings from GCC 4.6's "-Wunused-but-set-variable" option.
  21099. - When warning about missing zlib development packages during compile,
  21100. give the correct package names. Bugfix on 0.2.0.1-alpha.
  21101. - Fix warnings that newer versions of autoconf produce during
  21102. ./autogen.sh. These warnings appear to be harmless in our case,
  21103. but they were extremely verbose. Fixes bug 2020.
  21104. - Squash a compile warning on OpenBSD. Reported by Tas; fixes
  21105. bug 1848.
  21106. o Minor bugfixes (portability):
  21107. - Write several files in text mode, on OSes that distinguish text
  21108. mode from binary mode (namely, Windows). These files are:
  21109. 'buffer-stats', 'dirreq-stats', and 'entry-stats' on relays
  21110. that collect those statistics; 'client_keys' and 'hostname' for
  21111. hidden services that use authentication; and (in the tor-gencert
  21112. utility) newly generated identity and signing keys. Previously,
  21113. we wouldn't specify text mode or binary mode, leading to an
  21114. assertion failure. Fixes bug 3607. Bugfix on 0.2.1.1-alpha (when
  21115. the DirRecordUsageByCountry option which would have triggered
  21116. the assertion failure was added), although this assertion failure
  21117. would have occurred in tor-gencert on Windows in 0.2.0.1-alpha.
  21118. - Selectively disable deprecation warnings on OS X because Lion
  21119. started deprecating the shipped copy of openssl. Fixes bug 3643.
  21120. - Use a wide type to hold sockets when built for 64-bit Windows.
  21121. Fixes bug 3270.
  21122. - Fix an issue that prevented static linking of libevent on
  21123. some platforms (notably Linux). Fixes bug 2698; bugfix on 0.2.1.23,
  21124. where we introduced the "--with-static-libevent" configure option.
  21125. - Fix a bug with our locking implementation on Windows that couldn't
  21126. correctly detect when a file was already locked. Fixes bug 2504,
  21127. bugfix on 0.2.1.6-alpha.
  21128. - Build correctly on OSX with zlib 1.2.4 and higher with all warnings
  21129. enabled.
  21130. - Fix IPv6-related connect() failures on some platforms (BSD, OS X).
  21131. Bugfix on 0.2.0.3-alpha; fixes first part of bug 2660. Patch by
  21132. "piebeer".
  21133. o Minor bugfixes (code correctness):
  21134. - Always NUL-terminate the sun_path field of a sockaddr_un before
  21135. passing it to the kernel. (Not a security issue: kernels are
  21136. smart enough to reject bad sockaddr_uns.) Found by Coverity;
  21137. CID #428. Bugfix on Tor 0.2.0.3-alpha.
  21138. - Make connection_printf_to_buf()'s behavior sane. Its callers
  21139. expect it to emit a CRLF iff the format string ends with CRLF;
  21140. it actually emitted a CRLF iff (a) the format string ended with
  21141. CRLF or (b) the resulting string was over 1023 characters long or
  21142. (c) the format string did not end with CRLF *and* the resulting
  21143. string was 1021 characters long or longer. Bugfix on 0.1.1.9-alpha;
  21144. fixes part of bug 3407.
  21145. - Make send_control_event_impl()'s behavior sane. Its callers
  21146. expect it to always emit a CRLF at the end of the string; it
  21147. might have emitted extra control characters as well. Bugfix on
  21148. 0.1.1.9-alpha; fixes another part of bug 3407.
  21149. - Make crypto_rand_int() check the value of its input correctly.
  21150. Previously, it accepted values up to UINT_MAX, but could return a
  21151. negative number if given a value above INT_MAX+1. Found by George
  21152. Kadianakis. Fixes bug 3306; bugfix on 0.2.2pre14.
  21153. - Fix a potential null-pointer dereference while computing a
  21154. consensus. Bugfix on 0.2.0.3-alpha, found with the help of
  21155. clang's analyzer.
  21156. - If we fail to compute the identity digest of a v3 legacy keypair,
  21157. warn, and don't use a buffer-full of junk instead. Bugfix on
  21158. 0.2.1.1-alpha; fixes bug 3106.
  21159. - Resolve an untriggerable issue in smartlist_string_num_isin(),
  21160. where if the function had ever in the future been used to check
  21161. for the presence of a too-large number, it would have given an
  21162. incorrect result. (Fortunately, we only used it for 16-bit
  21163. values.) Fixes bug 3175; bugfix on 0.1.0.1-rc.
  21164. - Be more careful about reporting the correct error from a failed
  21165. connect() system call. Under some circumstances, it was possible to
  21166. look at an incorrect value for errno when sending the end reason.
  21167. Bugfix on 0.1.0.1-rc.
  21168. - Correctly handle an "impossible" overflow cases in connection byte
  21169. counting, where we write or read more than 4GB on an edge connection
  21170. in a single second. Bugfix on 0.1.2.8-beta.
  21171. - Avoid a double mark-for-free warning when failing to attach a
  21172. transparent proxy connection. Bugfix on 0.1.2.1-alpha. Fixes
  21173. bug 2279.
  21174. - Correctly detect failure to allocate an OpenSSL BIO. Fixes bug 2378;
  21175. found by "cypherpunks". This bug was introduced before the first
  21176. Tor release, in svn commit r110.
  21177. - Fix a bug in bandwidth history state parsing that could have been
  21178. triggered if a future version of Tor ever changed the timing
  21179. granularity at which bandwidth history is measured. Bugfix on
  21180. Tor 0.1.1.11-alpha.
  21181. - Add assertions to check for overflow in arguments to
  21182. base32_encode() and base32_decode(); fix a signed-unsigned
  21183. comparison there too. These bugs are not actually reachable in Tor,
  21184. but it's good to prevent future errors too. Found by doorss.
  21185. - Avoid a bogus overlapped memcpy in tor_addr_copy(). Reported by
  21186. "memcpyfail".
  21187. - Set target port in get_interface_address6() correctly. Bugfix
  21188. on 0.1.1.4-alpha and 0.2.0.3-alpha; fixes second part of bug 2660.
  21189. - Fix an impossible-to-actually-trigger buffer overflow in relay
  21190. descriptor generation. Bugfix on 0.1.0.15.
  21191. - Fix numerous small code-flaws found by Coverity Scan Rung 3.
  21192. o Minor bugfixes (code improvements):
  21193. - After we free an internal connection structure, overwrite it
  21194. with a different memory value than we use for overwriting a freed
  21195. internal circuit structure. Should help with debugging. Suggested
  21196. by bug 1055.
  21197. - If OpenSSL fails to make a duplicate of a private or public key, log
  21198. an error message and try to exit cleanly. May help with debugging
  21199. if bug 1209 ever remanifests.
  21200. - Some options used different conventions for uppercasing of acronyms
  21201. when comparing manpage and source. Fix those in favor of the
  21202. manpage, as it makes sense to capitalize acronyms.
  21203. - Take a first step towards making or.h smaller by splitting out
  21204. function definitions for all source files in src/or/. Leave
  21205. structures and defines in or.h for now.
  21206. - Remove a few dead assignments during router parsing. Found by
  21207. coverity.
  21208. - Don't use 1-bit wide signed bit fields. Found by coverity.
  21209. - Avoid signed/unsigned comparisons by making SIZE_T_CEILING unsigned.
  21210. None of the cases where we did this before were wrong, but by making
  21211. this change we avoid warnings. Fixes bug 2475; bugfix on 0.2.1.28.
  21212. - The memarea code now uses a sentinel value at the end of each area
  21213. to make sure nothing writes beyond the end of an area. This might
  21214. help debug some conceivable causes of bug 930.
  21215. - Always treat failure to allocate an RSA key as an unrecoverable
  21216. allocation error.
  21217. - Add some more defensive programming for architectures that can't
  21218. handle unaligned integer accesses. We don't know of any actual bugs
  21219. right now, but that's the best time to fix them. Fixes bug 1943.
  21220. o Minor bugfixes (misc):
  21221. - Fix a rare bug in rend_fn unit tests: we would fail a test when
  21222. a randomly generated port is 0. Diagnosed by Matt Edman. Bugfix
  21223. on 0.2.0.10-alpha; fixes bug 1808.
  21224. - Where available, use Libevent 2.0's periodic timers so that our
  21225. once-per-second cleanup code gets called even more closely to
  21226. once per second than it would otherwise. Fixes bug 943.
  21227. - Ignore OutboundBindAddress when connecting to localhost.
  21228. Connections to localhost need to come _from_ localhost, or else
  21229. local servers (like DNS and outgoing HTTP/SOCKS proxies) will often
  21230. refuse to listen.
  21231. - Update our OpenSSL 0.9.8l fix so that it works with OpenSSL 0.9.8m
  21232. too.
  21233. - If any of the v3 certs we download are unparseable, we should
  21234. actually notice the failure so we don't retry indefinitely. Bugfix
  21235. on 0.2.0.x; reported by "rotator".
  21236. - When Tor fails to parse a descriptor of any kind, dump it to disk.
  21237. Might help diagnosing bug 1051.
  21238. - Make our 'torify' script more portable; if we have only one of
  21239. 'torsocks' or 'tsocks' installed, don't complain to the user;
  21240. and explain our warning about tsocks better.
  21241. - Fix some urls in the exit notice file and make it XHTML1.1 strict
  21242. compliant. Based on a patch from Christian Kujau.
  21243. o Documentation changes:
  21244. - Modernize the doxygen configuration file slightly. Fixes bug 2707.
  21245. - Resolve all doxygen warnings except those for missing documentation.
  21246. Fixes bug 2705.
  21247. - Add doxygen documentation for more functions, fields, and types.
  21248. - Convert the HACKING file to asciidoc, and add a few new sections
  21249. to it, explaining how we use Git, how we make changelogs, and
  21250. what should go in a patch.
  21251. - Document the default socks host and port (127.0.0.1:9050) for
  21252. tor-resolve.
  21253. - Removed some unnecessary files from the source distribution. The
  21254. AUTHORS file has now been merged into the people page on the
  21255. website. The roadmaps and design doc can now be found in the
  21256. projects directory in svn.
  21257. o Deprecated and removed features (config):
  21258. - Remove the torrc.complete file. It hasn't been kept up to date
  21259. and users will have better luck checking out the manpage.
  21260. - Remove the HSAuthorityRecordStats option that version 0 hidden
  21261. service authorities could use to track statistics of overall v0
  21262. hidden service usage.
  21263. - Remove the obsolete "NoPublish" option; it has been flagged
  21264. as obsolete and has produced a warning since 0.1.1.18-rc.
  21265. - Caches no longer download and serve v2 networkstatus documents
  21266. unless FetchV2Networkstatus flag is set: these documents haven't
  21267. haven't been used by clients or relays since 0.2.0.x. Resolves
  21268. bug 3022.
  21269. o Deprecated and removed features (controller):
  21270. - The controller no longer accepts the old obsolete "addr-mappings/"
  21271. or "unregistered-servers-" GETINFO values.
  21272. - The EXTENDED_EVENTS and VERBOSE_NAMES controller features are now
  21273. always on; using them is necessary for correct forward-compatible
  21274. controllers.
  21275. o Deprecated and removed features (misc):
  21276. - Hidden services no longer publish version 0 descriptors, and clients
  21277. do not request or use version 0 descriptors. However, the old hidden
  21278. service authorities still accept and serve version 0 descriptors
  21279. when contacted by older hidden services/clients.
  21280. - Remove undocumented option "-F" from tor-resolve: it hasn't done
  21281. anything since 0.2.1.16-rc.
  21282. - Remove everything related to building the expert bundle for OS X.
  21283. It has confused many users, doesn't work right on OS X 10.6,
  21284. and is hard to get rid of once installed. Resolves bug 1274.
  21285. - Remove support for .noconnect style addresses. Nobody was using
  21286. them, and they provided another avenue for detecting Tor users
  21287. via application-level web tricks.
  21288. - When we fixed bug 1038 we had to put in a restriction not to send
  21289. RELAY_EARLY cells on rend circuits. This was necessary as long
  21290. as relays using Tor 0.2.1.3-alpha through 0.2.1.18-alpha were
  21291. active. Now remove this obsolete check. Resolves bug 2081.
  21292. - Remove workaround code to handle directory responses from servers
  21293. that had bug 539 (they would send HTTP status 503 responses _and_
  21294. send a body too). Since only server versions before
  21295. 0.2.0.16-alpha/0.1.2.19 were affected, there is no longer reason to
  21296. keep the workaround in place.
  21297. - Remove the old 'fuzzy time' logic. It was supposed to be used for
  21298. handling calculations where we have a known amount of clock skew and
  21299. an allowed amount of unknown skew. But we only used it in three
  21300. places, and we never adjusted the known/unknown skew values. This is
  21301. still something we might want to do someday, but if we do, we'll
  21302. want to do it differently.
  21303. - Remove the "--enable-iphone" option to ./configure. According to
  21304. reports from Marco Bonetti, Tor builds fine without any special
  21305. tweaking on recent iPhone SDK versions.
  21306. Changes in version 0.2.1.30 - 2011-02-23
  21307. Tor 0.2.1.30 fixes a variety of less critical bugs. The main other
  21308. change is a slight tweak to Tor's TLS handshake that makes relays
  21309. and bridges that run this new version reachable from Iran again.
  21310. We don't expect this tweak will win the arms race long-term, but it
  21311. buys us time until we roll out a better solution.
  21312. o Major bugfixes:
  21313. - Stop sending a CLOCK_SKEW controller status event whenever
  21314. we fetch directory information from a relay that has a wrong clock.
  21315. Instead, only inform the controller when it's a trusted authority
  21316. that claims our clock is wrong. Bugfix on 0.1.2.6-alpha; fixes
  21317. the rest of bug 1074.
  21318. - Fix a bounds-checking error that could allow an attacker to
  21319. remotely crash a directory authority. Bugfix on 0.2.1.5-alpha.
  21320. Found by "piebeer".
  21321. - If relays set RelayBandwidthBurst but not RelayBandwidthRate,
  21322. Tor would ignore their RelayBandwidthBurst setting,
  21323. potentially using more bandwidth than expected. Bugfix on
  21324. 0.2.0.1-alpha. Reported by Paul Wouters. Fixes bug 2470.
  21325. - Ignore and warn if the user mistakenly sets "PublishServerDescriptor
  21326. hidserv" in her torrc. The 'hidserv' argument never controlled
  21327. publication of hidden service descriptors. Bugfix on 0.2.0.1-alpha.
  21328. o Minor features:
  21329. - Adjust our TLS Diffie-Hellman parameters to match those used by
  21330. Apache's mod_ssl.
  21331. - Update to the February 1 2011 Maxmind GeoLite Country database.
  21332. o Minor bugfixes:
  21333. - Check for and reject overly long directory certificates and
  21334. directory tokens before they have a chance to hit any assertions.
  21335. Bugfix on 0.2.1.28. Found by "doorss".
  21336. - Bring the logic that gathers routerinfos and assesses the
  21337. acceptability of circuits into line. This prevents a Tor OP from
  21338. getting locked in a cycle of choosing its local OR as an exit for a
  21339. path (due to a .exit request) and then rejecting the circuit because
  21340. its OR is not listed yet. It also prevents Tor clients from using an
  21341. OR running in the same instance as an exit (due to a .exit request)
  21342. if the OR does not meet the same requirements expected of an OR
  21343. running elsewhere. Fixes bug 1859; bugfix on 0.1.0.1-rc.
  21344. o Packaging changes:
  21345. - Stop shipping the Tor specs files and development proposal documents
  21346. in the tarball. They are now in a separate git repository at
  21347. git://git.torproject.org/torspec.git
  21348. - Do not include Git version tags as though they are SVN tags when
  21349. generating a tarball from inside a repository that has switched
  21350. between branches. Bugfix on 0.2.1.15-rc; fixes bug 2402.
  21351. Changes in version 0.2.1.29 - 2011-01-15
  21352. Tor 0.2.1.29 continues our recent code security audit work. The main
  21353. fix resolves a remote heap overflow vulnerability that can allow remote
  21354. code execution. Other fixes address a variety of assert and crash bugs,
  21355. most of which we think are hard to exploit remotely.
  21356. o Major bugfixes (security):
  21357. - Fix a heap overflow bug where an adversary could cause heap
  21358. corruption. This bug probably allows remote code execution
  21359. attacks. Reported by "debuger". Fixes CVE-2011-0427. Bugfix on
  21360. 0.1.2.10-rc.
  21361. - Prevent a denial-of-service attack by disallowing any
  21362. zlib-compressed data whose compression factor is implausibly
  21363. high. Fixes part of bug 2324; reported by "doorss".
  21364. - Zero out a few more keys in memory before freeing them. Fixes
  21365. bug 2384 and part of bug 2385. These key instances found by
  21366. "cypherpunks", based on Andrew Case's report about being able
  21367. to find sensitive data in Tor's memory space if you have enough
  21368. permissions. Bugfix on 0.0.2pre9.
  21369. o Major bugfixes (crashes):
  21370. - Prevent calls to Libevent from inside Libevent log handlers.
  21371. This had potential to cause a nasty set of crashes, especially
  21372. if running Libevent with debug logging enabled, and running
  21373. Tor with a controller watching for low-severity log messages.
  21374. Bugfix on 0.1.0.2-rc. Fixes bug 2190.
  21375. - Add a check for SIZE_T_MAX to tor_realloc() to try to avoid
  21376. underflow errors there too. Fixes the other part of bug 2324.
  21377. - Fix a bug where we would assert if we ever had a
  21378. cached-descriptors.new file (or another file read directly into
  21379. memory) of exactly SIZE_T_CEILING bytes. Fixes bug 2326; bugfix
  21380. on 0.2.1.25. Found by doorss.
  21381. - Fix some potential asserts and parsing issues with grossly
  21382. malformed router caches. Fixes bug 2352; bugfix on Tor 0.2.1.27.
  21383. Found by doorss.
  21384. o Minor bugfixes (other):
  21385. - Fix a bug with handling misformed replies to reverse DNS lookup
  21386. requests in DNSPort. Bugfix on Tor 0.2.0.1-alpha. Related to a
  21387. bug reported by doorss.
  21388. - Fix compilation on mingw when a pthreads compatibility library
  21389. has been installed. (We don't want to use it, so we shouldn't
  21390. be including pthread.h.) Fixes bug 2313; bugfix on 0.1.0.1-rc.
  21391. - Fix a bug where we would declare that we had run out of virtual
  21392. addresses when the address space was only half-exhausted. Bugfix
  21393. on 0.1.2.1-alpha.
  21394. - Correctly handle the case where AutomapHostsOnResolve is set but
  21395. no virtual addresses are available. Fixes bug 2328; bugfix on
  21396. 0.1.2.1-alpha. Bug found by doorss.
  21397. - Correctly handle wrapping around when we run out of virtual
  21398. address space. Found by cypherpunks; bugfix on 0.2.0.5-alpha.
  21399. o Minor features:
  21400. - Update to the January 1 2011 Maxmind GeoLite Country database.
  21401. - Introduce output size checks on all of our decryption functions.
  21402. o Build changes:
  21403. - Tor does not build packages correctly with Automake 1.6 and earlier;
  21404. added a check to Makefile.am to make sure that we're building with
  21405. Automake 1.7 or later.
  21406. - The 0.2.1.28 tarball was missing src/common/OpenBSD_malloc_Linux.c
  21407. because we built it with a too-old version of automake. Thus that
  21408. release broke ./configure --enable-openbsd-malloc, which is popular
  21409. among really fast exit relays on Linux.
  21410. Changes in version 0.2.1.28 - 2010-12-17
  21411. Tor 0.2.1.28 does some code cleanup to reduce the risk of remotely
  21412. exploitable bugs. We also took this opportunity to change the IP address
  21413. for one of our directory authorities, and to update the geoip database
  21414. we ship.
  21415. o Major bugfixes:
  21416. - Fix a remotely exploitable bug that could be used to crash instances
  21417. of Tor remotely by overflowing on the heap. Remote-code execution
  21418. hasn't been confirmed, but can't be ruled out. Everyone should
  21419. upgrade. Bugfix on the 0.1.1 series and later.
  21420. o Directory authority changes:
  21421. - Change IP address and ports for gabelmoo (v3 directory authority).
  21422. o Minor features:
  21423. - Update to the December 1 2010 Maxmind GeoLite Country database.
  21424. Changes in version 0.2.1.27 - 2010-11-23
  21425. Yet another OpenSSL security patch broke its compatibility with Tor:
  21426. Tor 0.2.1.27 makes relays work with openssl 0.9.8p and 1.0.0.b. We
  21427. also took this opportunity to fix several crash bugs, integrate a new
  21428. directory authority, and update the bundled GeoIP database.
  21429. o Major bugfixes:
  21430. - Resolve an incompatibility with OpenSSL 0.9.8p and OpenSSL 1.0.0b:
  21431. No longer set the tlsext_host_name extension on server SSL objects;
  21432. but continue to set it on client SSL objects. Our goal in setting
  21433. it was to imitate a browser, not a vhosting server. Fixes bug 2204;
  21434. bugfix on 0.2.1.1-alpha.
  21435. - Do not log messages to the controller while shrinking buffer
  21436. freelists. Doing so would sometimes make the controller connection
  21437. try to allocate a buffer chunk, which would mess up the internals
  21438. of the freelist and cause an assertion failure. Fixes bug 1125;
  21439. fixed by Robert Ransom. Bugfix on 0.2.0.16-alpha.
  21440. - Learn our external IP address when we're a relay or bridge, even if
  21441. we set PublishServerDescriptor to 0. Bugfix on 0.2.0.3-alpha,
  21442. where we introduced bridge relays that don't need to publish to
  21443. be useful. Fixes bug 2050.
  21444. - Do even more to reject (and not just ignore) annotations on
  21445. router descriptors received anywhere but from the cache. Previously
  21446. we would ignore such annotations at first, but cache them to disk
  21447. anyway. Bugfix on 0.2.0.8-alpha. Found by piebeer.
  21448. - When you're using bridges and your network goes away and your
  21449. bridges get marked as down, recover when you attempt a new socks
  21450. connection (if the network is back), rather than waiting up to an
  21451. hour to try fetching new descriptors for your bridges. Bugfix on
  21452. 0.2.0.3-alpha; fixes bug 1981.
  21453. o Major features:
  21454. - Move to the November 2010 Maxmind GeoLite country db (rather
  21455. than the June 2009 ip-to-country GeoIP db) for our statistics that
  21456. count how many users relays are seeing from each country. Now we'll
  21457. have more accurate data, especially for many African countries.
  21458. o New directory authorities:
  21459. - Set up maatuska (run by Linus Nordberg) as the eighth v3 directory
  21460. authority.
  21461. o Minor bugfixes:
  21462. - Fix an assertion failure that could occur in directory caches or
  21463. bridge users when using a very short voting interval on a testing
  21464. network. Diagnosed by Robert Hogan. Fixes bug 1141; bugfix on
  21465. 0.2.0.8-alpha.
  21466. - Enforce multiplicity rules when parsing annotations. Bugfix on
  21467. 0.2.0.8-alpha. Found by piebeer.
  21468. - Allow handshaking OR connections to take a full KeepalivePeriod
  21469. seconds to handshake. Previously, we would close them after
  21470. IDLE_OR_CONN_TIMEOUT (180) seconds, the same timeout as if they
  21471. were open. Bugfix on 0.2.1.26; fixes bug 1840. Thanks to mingw-san
  21472. for analysis help.
  21473. - When building with --enable-gcc-warnings on OpenBSD, disable
  21474. warnings in system headers. This makes --enable-gcc-warnings
  21475. pass on OpenBSD 4.8.
  21476. o Minor features:
  21477. - Exit nodes didn't recognize EHOSTUNREACH as a plausible error code,
  21478. and so sent back END_STREAM_REASON_MISC. Clients now recognize a new
  21479. stream ending reason for this case: END_STREAM_REASON_NOROUTE.
  21480. Servers can start sending this code when enough clients recognize
  21481. it. Bugfix on 0.1.0.1-rc; fixes part of bug 1793.
  21482. - Build correctly on mingw with more recent versions of OpenSSL 0.9.8.
  21483. Patch from mingw-san.
  21484. o Removed files:
  21485. - Remove the old debian/ directory from the main Tor distribution.
  21486. The official Tor-for-debian git repository lives at the URL
  21487. https://git.torproject.org/debian/tor.git
  21488. - Stop shipping the old doc/website/ directory in the tarball. We
  21489. changed the website format in late 2010, and what we shipped in
  21490. 0.2.1.26 really wasn't that useful anyway.
  21491. Changes in version 0.2.1.26 - 2010-05-02
  21492. Tor 0.2.1.26 addresses the recent connection and memory overload
  21493. problems we've been seeing on relays, especially relays with their
  21494. DirPort open. If your relay has been crashing, or you turned it off
  21495. because it used too many resources, give this release a try.
  21496. This release also fixes yet another instance of broken OpenSSL libraries
  21497. that was causing some relays to drop out of the consensus.
  21498. o Major bugfixes:
  21499. - Teach relays to defend themselves from connection overload. Relays
  21500. now close idle circuits early if it looks like they were intended
  21501. for directory fetches. Relays are also more aggressive about closing
  21502. TLS connections that have no circuits on them. Such circuits are
  21503. unlikely to be re-used, and tens of thousands of them were piling
  21504. up at the fast relays, causing the relays to run out of sockets
  21505. and memory. Bugfix on 0.2.0.22-rc (where clients started tunneling
  21506. their directory fetches over TLS).
  21507. - Fix SSL renegotiation behavior on OpenSSL versions like on Centos
  21508. that claim to be earlier than 0.9.8m, but which have in reality
  21509. backported huge swaths of 0.9.8m or 0.9.8n renegotiation
  21510. behavior. Possible fix for some cases of bug 1346.
  21511. - Directory mirrors were fetching relay descriptors only from v2
  21512. directory authorities, rather than v3 authorities like they should.
  21513. Only 2 v2 authorities remain (compared to 7 v3 authorities), leading
  21514. to a serious bottleneck. Bugfix on 0.2.0.9-alpha. Fixes bug 1324.
  21515. o Minor bugfixes:
  21516. - Finally get rid of the deprecated and now harmful notion of "clique
  21517. mode", where directory authorities maintain TLS connections to
  21518. every other relay.
  21519. o Testsuite fixes:
  21520. - In the util/threads test, no longer free the test_mutex before all
  21521. worker threads have finished. Bugfix on 0.2.1.6-alpha.
  21522. - The master thread could starve the worker threads quite badly on
  21523. certain systems, causing them to run only partially in the allowed
  21524. window. This resulted in test failures. Now the master thread sleeps
  21525. occasionally for a few microseconds while the two worker-threads
  21526. compete for the mutex. Bugfix on 0.2.0.1-alpha.
  21527. Changes in version 0.2.1.25 - 2010-03-16
  21528. Tor 0.2.1.25 fixes a regression introduced in 0.2.1.23 that could
  21529. prevent relays from guessing their IP address correctly. It also fixes
  21530. several minor potential security bugs.
  21531. o Major bugfixes:
  21532. - Fix a regression from our patch for bug 1244 that caused relays
  21533. to guess their IP address incorrectly if they didn't set Address
  21534. in their torrc and/or their address fails to resolve. Bugfix on
  21535. 0.2.1.23; fixes bug 1269.
  21536. - When freeing a session key, zero it out completely. We only zeroed
  21537. the first ptrsize bytes. Bugfix on 0.0.2pre8. Discovered and
  21538. patched by ekir. Fixes bug 1254.
  21539. o Minor bugfixes:
  21540. - Fix a dereference-then-NULL-check sequence when publishing
  21541. descriptors. Bugfix on 0.2.1.5-alpha. Discovered by ekir; fixes
  21542. bug 1255.
  21543. - Fix another dereference-then-NULL-check sequence. Bugfix on
  21544. 0.2.1.14-rc. Discovered by ekir; fixes bug 1256.
  21545. - Make sure we treat potentially not NUL-terminated strings correctly.
  21546. Bugfix on 0.1.1.13-alpha. Discovered by rieo; fixes bug 1257.
  21547. Changes in version 0.2.1.24 - 2010-02-21
  21548. Tor 0.2.1.24 makes Tor work again on the latest OS X -- this time
  21549. for sure!
  21550. o Minor bugfixes:
  21551. - Work correctly out-of-the-box with even more vendor-patched versions
  21552. of OpenSSL. In particular, make it so Debian and OS X don't need
  21553. customized patches to run/build.
  21554. Changes in version 0.2.1.23 - 2010-02-13
  21555. Tor 0.2.1.23 fixes a huge client-side performance bug, makes Tor work
  21556. again on the latest OS X, and updates the location of a directory
  21557. authority.
  21558. o Major bugfixes (performance):
  21559. - We were selecting our guards uniformly at random, and then weighting
  21560. which of our guards we'd use uniformly at random. This imbalance
  21561. meant that Tor clients were severely limited on throughput (and
  21562. probably latency too) by the first hop in their circuit. Now we
  21563. select guards weighted by currently advertised bandwidth. We also
  21564. automatically discard guards picked using the old algorithm. Fixes
  21565. bug 1217; bugfix on 0.2.1.3-alpha. Found by Mike Perry.
  21566. o Major bugfixes:
  21567. - Make Tor work again on the latest OS X: when deciding whether to
  21568. use strange flags to turn TLS renegotiation on, detect the OpenSSL
  21569. version at run-time, not compile time. We need to do this because
  21570. Apple doesn't update its dev-tools headers when it updates its
  21571. libraries in a security patch.
  21572. - Fix a potential buffer overflow in lookup_last_hid_serv_request()
  21573. that could happen on 32-bit platforms with 64-bit time_t. Also fix
  21574. a memory leak when requesting a hidden service descriptor we've
  21575. requested before. Fixes bug 1242, bugfix on 0.2.0.18-alpha. Found
  21576. by aakova.
  21577. o Minor bugfixes:
  21578. - Refactor resolve_my_address() to not use gethostbyname() anymore.
  21579. Fixes bug 1244; bugfix on 0.0.2pre25. Reported by Mike Mestnik.
  21580. o Minor features:
  21581. - Avoid a mad rush at the beginning of each month when each client
  21582. rotates half of its guards. Instead we spread the rotation out
  21583. throughout the month, but we still avoid leaving a precise timestamp
  21584. in the state file about when we first picked the guard. Improves
  21585. over the behavior introduced in 0.1.2.17.
  21586. Changes in version 0.2.1.22 - 2010-01-19
  21587. Tor 0.2.1.22 fixes a critical privacy problem in bridge directory
  21588. authorities -- it would tell you its whole history of bridge descriptors
  21589. if you make the right directory request. This stable update also
  21590. rotates two of the seven v3 directory authority keys and locations.
  21591. o Directory authority changes:
  21592. - Rotate keys (both v3 identity and relay identity) for moria1
  21593. and gabelmoo.
  21594. o Major bugfixes:
  21595. - Stop bridge directory authorities from answering dbg-stability.txt
  21596. directory queries, which would let people fetch a list of all
  21597. bridge identities they track. Bugfix on 0.2.1.6-alpha.
  21598. Changes in version 0.2.1.21 - 2009-12-21
  21599. Tor 0.2.1.21 fixes an incompatibility with the most recent OpenSSL
  21600. library. If you use Tor on Linux / Unix and you're getting SSL
  21601. renegotiation errors, upgrading should help. We also recommend an
  21602. upgrade if you're an exit relay.
  21603. o Major bugfixes:
  21604. - Work around a security feature in OpenSSL 0.9.8l that prevents our
  21605. handshake from working unless we explicitly tell OpenSSL that we
  21606. are using SSL renegotiation safely. We are, of course, but OpenSSL
  21607. 0.9.8l won't work unless we say we are.
  21608. - Avoid crashing if the client is trying to upload many bytes and the
  21609. circuit gets torn down at the same time, or if the flip side
  21610. happens on the exit relay. Bugfix on 0.2.0.1-alpha; fixes bug 1150.
  21611. o Minor bugfixes:
  21612. - Do not refuse to learn about authority certs and v2 networkstatus
  21613. documents that are older than the latest consensus. This bug might
  21614. have degraded client bootstrapping. Bugfix on 0.2.0.10-alpha.
  21615. Spotted and fixed by xmux.
  21616. - Fix a couple of very-hard-to-trigger memory leaks, and one hard-to-
  21617. trigger platform-specific option misparsing case found by Coverity
  21618. Scan.
  21619. - Fix a compilation warning on Fedora 12 by removing an impossible-to-
  21620. trigger assert. Fixes bug 1173.
  21621. Changes in version 0.2.1.20 - 2009-10-15
  21622. Tor 0.2.1.20 fixes a crash bug when you're accessing many hidden
  21623. services at once, prepares for more performance improvements, and
  21624. fixes a bunch of smaller bugs.
  21625. The Windows and OS X bundles also include a more recent Vidalia,
  21626. and switch from Privoxy to Polipo.
  21627. The OS X installers are now drag and drop. It's best to un-install
  21628. Tor/Vidalia and then install this new bundle, rather than upgrade. If
  21629. you want to upgrade, you'll need to update the paths for Tor and Polipo
  21630. in the Vidalia Settings window.
  21631. o Major bugfixes:
  21632. - Send circuit or stream sendme cells when our window has decreased
  21633. by 100 cells, not when it has decreased by 101 cells. Bug uncovered
  21634. by Karsten when testing the "reduce circuit window" performance
  21635. patch. Bugfix on the 54th commit on Tor -- from July 2002,
  21636. before the release of Tor 0.0.0. This is the new winner of the
  21637. oldest-bug prize.
  21638. - Fix a remotely triggerable memory leak when a consensus document
  21639. contains more than one signature from the same voter. Bugfix on
  21640. 0.2.0.3-alpha.
  21641. - Avoid segfault in rare cases when finishing an introduction circuit
  21642. as a client and finding out that we don't have an introduction key
  21643. for it. Fixes bug 1073. Reported by Aaron Swartz.
  21644. o Major features:
  21645. - Tor now reads the "circwindow" parameter out of the consensus,
  21646. and uses that value for its circuit package window rather than the
  21647. default of 1000 cells. Begins the implementation of proposal 168.
  21648. o New directory authorities:
  21649. - Set up urras (run by Jacob Appelbaum) as the seventh v3 directory
  21650. authority.
  21651. - Move moria1 and tonga to alternate IP addresses.
  21652. o Minor bugfixes:
  21653. - Fix a signed/unsigned compile warning in 0.2.1.19.
  21654. - Fix possible segmentation fault on directory authorities. Bugfix on
  21655. 0.2.1.14-rc.
  21656. - Fix an extremely rare infinite recursion bug that could occur if
  21657. we tried to log a message after shutting down the log subsystem.
  21658. Found by Matt Edman. Bugfix on 0.2.0.16-alpha.
  21659. - Fix an obscure bug where hidden services on 64-bit big-endian
  21660. systems might mis-read the timestamp in v3 introduce cells, and
  21661. refuse to connect back to the client. Discovered by "rotor".
  21662. Bugfix on 0.2.1.6-alpha.
  21663. - We were triggering a CLOCK_SKEW controller status event whenever
  21664. we connect via the v2 connection protocol to any relay that has
  21665. a wrong clock. Instead, we should only inform the controller when
  21666. it's a trusted authority that claims our clock is wrong. Bugfix
  21667. on 0.2.0.20-rc; starts to fix bug 1074. Reported by SwissTorExit.
  21668. - We were telling the controller about CHECKING_REACHABILITY and
  21669. REACHABILITY_FAILED status events whenever we launch a testing
  21670. circuit or notice that one has failed. Instead, only tell the
  21671. controller when we want to inform the user of overall success or
  21672. overall failure. Bugfix on 0.1.2.6-alpha. Fixes bug 1075. Reported
  21673. by SwissTorExit.
  21674. - Don't warn when we're using a circuit that ends with a node
  21675. excluded in ExcludeExitNodes, but the circuit is not used to access
  21676. the outside world. This should help fix bug 1090. Bugfix on
  21677. 0.2.1.6-alpha.
  21678. - Work around a small memory leak in some versions of OpenSSL that
  21679. stopped the memory used by the hostname TLS extension from being
  21680. freed.
  21681. o Minor features:
  21682. - Add a "getinfo status/accepted-server-descriptor" controller
  21683. command, which is the recommended way for controllers to learn
  21684. whether our server descriptor has been successfully received by at
  21685. least on directory authority. Un-recommend good-server-descriptor
  21686. getinfo and status events until we have a better design for them.
  21687. Changes in version 0.2.1.19 - 2009-07-28
  21688. Tor 0.2.1.19 fixes a major bug with accessing and providing hidden
  21689. services.
  21690. o Major bugfixes:
  21691. - Make accessing hidden services on 0.2.1.x work right again.
  21692. Bugfix on 0.2.1.3-alpha; workaround for bug 1038. Diagnosis and
  21693. part of patch provided by "optimist".
  21694. o Minor features:
  21695. - When a relay/bridge is writing out its identity key fingerprint to
  21696. the "fingerprint" file and to its logs, write it without spaces. Now
  21697. it will look like the fingerprints in our bridges documentation,
  21698. and confuse fewer users.
  21699. o Minor bugfixes:
  21700. - Relays no longer publish a new server descriptor if they change
  21701. their MaxAdvertisedBandwidth config option but it doesn't end up
  21702. changing their advertised bandwidth numbers. Bugfix on 0.2.0.28-rc;
  21703. fixes bug 1026. Patch from Sebastian.
  21704. - Avoid leaking memory every time we get a create cell but we have
  21705. so many already queued that we refuse it. Bugfix on 0.2.0.19-alpha;
  21706. fixes bug 1034. Reported by BarkerJr.
  21707. Changes in version 0.2.1.18 - 2009-07-24
  21708. Tor 0.2.1.18 lays the foundations for performance improvements,
  21709. adds status events to help users diagnose bootstrap problems, adds
  21710. optional authentication/authorization for hidden services, fixes a
  21711. variety of potential anonymity problems, and includes a huge pile of
  21712. other features and bug fixes.
  21713. o Major features (clients):
  21714. - Start sending "bootstrap phase" status events to the controller,
  21715. so it can keep the user informed of progress fetching directory
  21716. information and establishing circuits. Also inform the controller
  21717. if we think we're stuck at a particular bootstrap phase. Implements
  21718. proposal 137.
  21719. - Clients replace entry guards that were chosen more than a few months
  21720. ago. This change should significantly improve client performance,
  21721. especially once more people upgrade, since relays that have been
  21722. a guard for a long time are currently overloaded.
  21723. - Network status consensus documents and votes now contain bandwidth
  21724. information for each relay. Clients use the bandwidth values
  21725. in the consensus, rather than the bandwidth values in each
  21726. relay descriptor. This approach opens the door to more accurate
  21727. bandwidth estimates once the directory authorities start doing
  21728. active measurements. Implements part of proposal 141.
  21729. o Major features (relays):
  21730. - Disable and refactor some debugging checks that forced a linear scan
  21731. over the whole server-side DNS cache. These accounted for over 50%
  21732. of CPU time on a relatively busy exit node's gprof profile. Also,
  21733. disable some debugging checks that appeared in exit node profile
  21734. data. Found by Jacob.
  21735. - New DirPortFrontPage option that takes an html file and publishes
  21736. it as "/" on the DirPort. Now relay operators can provide a
  21737. disclaimer without needing to set up a separate webserver. There's
  21738. a sample disclaimer in contrib/tor-exit-notice.html.
  21739. o Major features (hidden services):
  21740. - Make it possible to build hidden services that only certain clients
  21741. are allowed to connect to. This is enforced at several points,
  21742. so that unauthorized clients are unable to send INTRODUCE cells
  21743. to the service, or even (depending on the type of authentication)
  21744. to learn introduction points. This feature raises the bar for
  21745. certain kinds of active attacks against hidden services. Design
  21746. and code by Karsten Loesing. Implements proposal 121.
  21747. - Relays now store and serve v2 hidden service descriptors by default,
  21748. i.e., the new default value for HidServDirectoryV2 is 1. This is
  21749. the last step in proposal 114, which aims to make hidden service
  21750. lookups more reliable.
  21751. o Major features (path selection):
  21752. - ExitNodes and Exclude*Nodes config options now allow you to restrict
  21753. by country code ("{US}") or IP address or address pattern
  21754. ("255.128.0.0/16"). Patch from Robert Hogan. It still needs some
  21755. refinement to decide what config options should take priority if
  21756. you ask to both use a particular node and exclude it.
  21757. o Major features (misc):
  21758. - When building a consensus, do not include routers that are down.
  21759. This cuts down 30% to 40% on consensus size. Implements proposal
  21760. 138.
  21761. - New TestingTorNetwork config option to allow adjustment of
  21762. previously constant values that could slow bootstrapping. Implements
  21763. proposal 135. Patch from Karsten.
  21764. - Convert many internal address representations to optionally hold
  21765. IPv6 addresses. Generate and accept IPv6 addresses in many protocol
  21766. elements. Make resolver code handle nameservers located at IPv6
  21767. addresses.
  21768. - More work on making our TLS handshake blend in: modify the list
  21769. of ciphers advertised by OpenSSL in client mode to even more
  21770. closely resemble a common web browser. We cheat a little so that
  21771. we can advertise ciphers that the locally installed OpenSSL doesn't
  21772. know about.
  21773. - Use the TLS1 hostname extension to more closely resemble browser
  21774. behavior.
  21775. o Security fixes (anonymity/entropy):
  21776. - Never use a connection with a mismatched address to extend a
  21777. circuit, unless that connection is canonical. A canonical
  21778. connection is one whose address is authenticated by the router's
  21779. identity key, either in a NETINFO cell or in a router descriptor.
  21780. - Implement most of proposal 110: The first K cells to be sent
  21781. along a circuit are marked as special "early" cells; only K "early"
  21782. cells will be allowed. Once this code is universal, we can block
  21783. certain kinds of denial-of-service attack by requiring that EXTEND
  21784. commands must be sent using an "early" cell.
  21785. - Resume using OpenSSL's RAND_poll() for better (and more portable)
  21786. cross-platform entropy collection again. We used to use it, then
  21787. stopped using it because of a bug that could crash systems that
  21788. called RAND_poll when they had a lot of fds open. It looks like the
  21789. bug got fixed in late 2006. Our new behavior is to call RAND_poll()
  21790. at startup, and to call RAND_poll() when we reseed later only if
  21791. we have a non-buggy OpenSSL version.
  21792. - When the client is choosing entry guards, now it selects at most
  21793. one guard from a given relay family. Otherwise we could end up with
  21794. all of our entry points into the network run by the same operator.
  21795. Suggested by Camilo Viecco. Fix on 0.1.1.11-alpha.
  21796. - Do not use or believe expired v3 authority certificates. Patch
  21797. from Karsten. Bugfix in 0.2.0.x. Fixes bug 851.
  21798. - Drop begin cells to a hidden service if they come from the middle
  21799. of a circuit. Patch from lark.
  21800. - When we erroneously receive two EXTEND cells for the same circuit
  21801. ID on the same connection, drop the second. Patch from lark.
  21802. - Authorities now vote for the Stable flag for any router whose
  21803. weighted MTBF is at least 5 days, regardless of the mean MTBF.
  21804. - Clients now never report any stream end reason except 'MISC'.
  21805. Implements proposal 148.
  21806. o Major bugfixes (crashes):
  21807. - Parse dates and IPv4 addresses in a locale- and libc-independent
  21808. manner, to avoid platform-dependent behavior on malformed input.
  21809. - Fix a crash that occurs on exit nodes when a nameserver request
  21810. timed out. Bugfix on 0.1.2.1-alpha; our CLEAR debugging code had
  21811. been suppressing the bug since 0.1.2.10-alpha. Partial fix for
  21812. bug 929.
  21813. - Do not assume that a stack-allocated character array will be
  21814. 64-bit aligned on platforms that demand that uint64_t access is
  21815. aligned. Possible fix for bug 604.
  21816. - Resolve a very rare crash bug that could occur when the user forced
  21817. a nameserver reconfiguration during the middle of a nameserver
  21818. probe. Fixes bug 526. Bugfix on 0.1.2.1-alpha.
  21819. - Avoid a "0 divided by 0" calculation when calculating router uptime
  21820. at directory authorities. Bugfix on 0.2.0.8-alpha.
  21821. - Fix an assertion bug in parsing policy-related options; possible fix
  21822. for bug 811.
  21823. - Rate-limit too-many-sockets messages: when they happen, they happen
  21824. a lot and end up filling up the disk. Resolves bug 748.
  21825. - Fix a race condition that could cause crashes or memory corruption
  21826. when running as a server with a controller listening for log
  21827. messages.
  21828. - Avoid crashing when we have a policy specified in a DirPolicy or
  21829. SocksPolicy or ReachableAddresses option with ports set on it,
  21830. and we re-load the policy. May fix bug 996.
  21831. - Fix an assertion failure on 64-bit platforms when we allocated
  21832. memory right up to the end of a memarea, then realigned the memory
  21833. one step beyond the end. Fixes a possible cause of bug 930.
  21834. - Protect the count of open sockets with a mutex, so we can't
  21835. corrupt it when two threads are closing or opening sockets at once.
  21836. Fix for bug 939. Bugfix on 0.2.0.1-alpha.
  21837. o Major bugfixes (clients):
  21838. - Discard router descriptors as we load them if they are more than
  21839. five days old. Otherwise if Tor is off for a long time and then
  21840. starts with cached descriptors, it will try to use the onion keys
  21841. in those obsolete descriptors when building circuits. Fixes bug 887.
  21842. - When we choose to abandon a new entry guard because we think our
  21843. older ones might be better, close any circuits pending on that
  21844. new entry guard connection. This fix should make us recover much
  21845. faster when our network is down and then comes back. Bugfix on
  21846. 0.1.2.8-beta; found by lodger.
  21847. - When Tor clients restart after 1-5 days, they discard all their
  21848. cached descriptors as too old, but they still use the cached
  21849. consensus document. This approach is good for robustness, but
  21850. bad for performance: since they don't know any bandwidths, they
  21851. end up choosing at random rather than weighting their choice by
  21852. speed. Fixed by the above feature of putting bandwidths in the
  21853. consensus.
  21854. o Major bugfixes (relays):
  21855. - Relays were falling out of the networkstatus consensus for
  21856. part of a day if they changed their local config but the
  21857. authorities discarded their new descriptor as "not sufficiently
  21858. different". Now directory authorities accept a descriptor as changed
  21859. if BandwidthRate or BandwidthBurst changed. Partial fix for bug 962;
  21860. patch by Sebastian.
  21861. - Ensure that two circuits can never exist on the same connection
  21862. with the same circuit ID, even if one is marked for close. This
  21863. is conceivably a bugfix for bug 779; fixes a bug on 0.1.0.4-rc.
  21864. - Directory authorities were neglecting to mark relays down in their
  21865. internal histories if the relays fall off the routerlist without
  21866. ever being found unreachable. So there were relays in the histories
  21867. that haven't been seen for eight months, and are listed as being
  21868. up for eight months. This wreaked havoc on the "median wfu" and
  21869. "median mtbf" calculations, in turn making Guard and Stable flags
  21870. wrong, hurting network performance. Fixes bugs 696 and 969. Bugfix
  21871. on 0.2.0.6-alpha.
  21872. o Major bugfixes (hidden services):
  21873. - When establishing a hidden service, introduction points that
  21874. originate from cannibalized circuits were completely ignored
  21875. and not included in rendezvous service descriptors. This might
  21876. have been another reason for delay in making a hidden service
  21877. available. Bugfix from long ago (0.0.9.x?)
  21878. o Major bugfixes (memory and resource management):
  21879. - Fixed some memory leaks -- some quite frequent, some almost
  21880. impossible to trigger -- based on results from Coverity.
  21881. - Speed up parsing and cut down on memory fragmentation by using
  21882. stack-style allocations for parsing directory objects. Previously,
  21883. this accounted for over 40% of allocations from within Tor's code
  21884. on a typical directory cache.
  21885. - Use a Bloom filter rather than a digest-based set to track which
  21886. descriptors we need to keep around when we're cleaning out old
  21887. router descriptors. This speeds up the computation significantly,
  21888. and may reduce fragmentation.
  21889. o New/changed config options:
  21890. - Now NodeFamily and MyFamily config options allow spaces in
  21891. identity fingerprints, so it's easier to paste them in.
  21892. Suggested by Lucky Green.
  21893. - Allow ports 465 and 587 in the default exit policy again. We had
  21894. rejected them in 0.1.0.15, because back in 2005 they were commonly
  21895. misconfigured and ended up as spam targets. We hear they are better
  21896. locked down these days.
  21897. - Make TrackHostExit mappings expire a while after their last use, not
  21898. after their creation. Patch from Robert Hogan.
  21899. - Add an ExcludeExitNodes option so users can list a set of nodes
  21900. that should be be excluded from the exit node position, but
  21901. allowed elsewhere. Implements proposal 151.
  21902. - New --hush command-line option similar to --quiet. While --quiet
  21903. disables all logging to the console on startup, --hush limits the
  21904. output to messages of warning and error severity.
  21905. - New configure/torrc options (--enable-geoip-stats,
  21906. DirRecordUsageByCountry) to record how many IPs we've served
  21907. directory info to in each country code, how many status documents
  21908. total we've sent to each country code, and what share of the total
  21909. directory requests we should expect to see.
  21910. - Make outbound DNS packets respect the OutboundBindAddress setting.
  21911. Fixes the bug part of bug 798. Bugfix on 0.1.2.2-alpha.
  21912. - Allow separate log levels to be configured for different logging
  21913. domains. For example, this allows one to log all notices, warnings,
  21914. or errors, plus all memory management messages of level debug or
  21915. higher, with: Log [MM] debug-err [*] notice-err file /var/log/tor.
  21916. - Update to the "June 3 2009" ip-to-country file.
  21917. o Minor features (relays):
  21918. - Raise the minimum rate limiting to be a relay from 20000 bytes
  21919. to 20480 bytes (aka 20KB/s), to match our documentation. Also
  21920. update directory authorities so they always assign the Fast flag
  21921. to relays with 20KB/s of capacity. Now people running relays won't
  21922. suddenly find themselves not seeing any use, if the network gets
  21923. faster on average.
  21924. - If we're a relay and we change our IP address, be more verbose
  21925. about the reason that made us change. Should help track down
  21926. further bugs for relays on dynamic IP addresses.
  21927. - Exit servers can now answer resolve requests for ip6.arpa addresses.
  21928. - Implement most of Proposal 152: allow specialized servers to permit
  21929. single-hop circuits, and clients to use those servers to build
  21930. single-hop circuits when using a specialized controller. Patch
  21931. from Josh Albrecht. Resolves feature request 768.
  21932. - When relays do their initial bandwidth measurement, don't limit
  21933. to just our entry guards for the test circuits. Otherwise we tend
  21934. to have multiple test circuits going through a single entry guard,
  21935. which makes our bandwidth test less accurate. Fixes part of bug 654;
  21936. patch contributed by Josh Albrecht.
  21937. o Minor features (directory authorities):
  21938. - Try not to open more than one descriptor-downloading connection
  21939. to an authority at once. This should reduce load on directory
  21940. authorities. Fixes bug 366.
  21941. - Add cross-certification to newly generated certificates, so that
  21942. a signing key is enough information to look up a certificate. Start
  21943. serving certificates by <identity digest, signing key digest>
  21944. pairs. Implements proposal 157.
  21945. - When a directory authority downloads a descriptor that it then
  21946. immediately rejects, do not retry downloading it right away. Should
  21947. save some bandwidth on authorities. Fix for bug 888. Patch by
  21948. Sebastian Hahn.
  21949. - Directory authorities now serve a /tor/dbg-stability.txt URL to
  21950. help debug WFU and MTBF calculations.
  21951. - In directory authorities' approved-routers files, allow
  21952. fingerprints with or without space.
  21953. o Minor features (directory mirrors):
  21954. - When a download gets us zero good descriptors, do not notify
  21955. Tor that new directory information has arrived.
  21956. - Servers support a new URL scheme for consensus downloads that
  21957. allows the client to specify which authorities are trusted.
  21958. The server then only sends the consensus if the client will trust
  21959. it. Otherwise a 404 error is sent back. Clients use this
  21960. new scheme when the server supports it (meaning it's running
  21961. 0.2.1.1-alpha or later). Implements proposal 134.
  21962. o Minor features (bridges):
  21963. - If the bridge config line doesn't specify a port, assume 443.
  21964. This makes bridge lines a bit smaller and easier for users to
  21965. understand.
  21966. - If we're using bridges and our network goes away, be more willing
  21967. to forgive our bridges and try again when we get an application
  21968. request.
  21969. o Minor features (hidden services):
  21970. - When the client launches an introduction circuit, retry with a
  21971. new circuit after 30 seconds rather than 60 seconds.
  21972. - Launch a second client-side introduction circuit in parallel
  21973. after a delay of 15 seconds (based on work by Christian Wilms).
  21974. - Hidden services start out building five intro circuits rather
  21975. than three, and when the first three finish they publish a service
  21976. descriptor using those. Now we publish our service descriptor much
  21977. faster after restart.
  21978. - Drop the requirement to have an open dir port for storing and
  21979. serving v2 hidden service descriptors.
  21980. o Minor features (build and packaging):
  21981. - On Linux, use the prctl call to re-enable core dumps when the User
  21982. option is set.
  21983. - Try to make sure that the version of Libevent we're running with
  21984. is binary-compatible with the one we built with. May address bug
  21985. 897 and others.
  21986. - Add a new --enable-local-appdata configuration switch to change
  21987. the default location of the datadir on win32 from APPDATA to
  21988. LOCAL_APPDATA. In the future, we should migrate to LOCAL_APPDATA
  21989. entirely. Patch from coderman.
  21990. - Build correctly against versions of OpenSSL 0.9.8 or later that
  21991. are built without support for deprecated functions.
  21992. - On platforms with a maximum syslog string length, truncate syslog
  21993. messages to that length ourselves, rather than relying on the
  21994. system to do it for us.
  21995. - Automatically detect MacOSX versions earlier than 10.4.0, and
  21996. disable kqueue from inside Tor when running with these versions.
  21997. We previously did this from the startup script, but that was no
  21998. help to people who didn't use the startup script. Resolves bug 863.
  21999. - Build correctly when configured to build outside the main source
  22000. path. Patch from Michael Gold.
  22001. - Disable GCC's strict alias optimization by default, to avoid the
  22002. likelihood of its introducing subtle bugs whenever our code violates
  22003. the letter of C99's alias rules.
  22004. - Change the contrib/tor.logrotate script so it makes the new
  22005. logs as "_tor:_tor" rather than the default, which is generally
  22006. "root:wheel". Fixes bug 676, reported by Serge Koksharov.
  22007. - Change our header file guard macros to be less likely to conflict
  22008. with system headers. Adam Langley noticed that we were conflicting
  22009. with log.h on Android.
  22010. - Add a couple of extra warnings to --enable-gcc-warnings for GCC 4.3,
  22011. and stop using a warning that had become unfixably verbose under
  22012. GCC 4.3.
  22013. - Use a lockfile to make sure that two Tor processes are not
  22014. simultaneously running with the same datadir.
  22015. - Allow OpenSSL to use dynamic locks if it wants.
  22016. - Add LIBS=-lrt to Makefile.am so the Tor RPMs use a static libevent.
  22017. o Minor features (controllers):
  22018. - When generating circuit events with verbose nicknames for
  22019. controllers, try harder to look up nicknames for routers on a
  22020. circuit. (Previously, we would look in the router descriptors we had
  22021. for nicknames, but not in the consensus.) Partial fix for bug 941.
  22022. - New controller event NEWCONSENSUS that lists the networkstatus
  22023. lines for every recommended relay. Now controllers like Torflow
  22024. can keep up-to-date on which relays they should be using.
  22025. - New controller event "clients_seen" to report a geoip-based summary
  22026. of which countries we've seen clients from recently. Now controllers
  22027. like Vidalia can show bridge operators that they're actually making
  22028. a difference.
  22029. - Add a 'getinfo status/clients-seen' controller command, in case
  22030. controllers want to hear clients_seen events but connect late.
  22031. - New CONSENSUS_ARRIVED event to note when a new consensus has
  22032. been fetched and validated.
  22033. - Add an internal-use-only __ReloadTorrcOnSIGHUP option for
  22034. controllers to prevent SIGHUP from reloading the configuration.
  22035. Fixes bug 856.
  22036. - Return circuit purposes in response to GETINFO circuit-status.
  22037. Fixes bug 858.
  22038. - Serve the latest v3 networkstatus consensus via the control
  22039. port. Use "getinfo dir/status-vote/current/consensus" to fetch it.
  22040. - Add a "GETINFO /status/bootstrap-phase" controller option, so the
  22041. controller can query our current bootstrap state in case it attaches
  22042. partway through and wants to catch up.
  22043. - Provide circuit purposes along with circuit events to the controller.
  22044. o Minor features (tools):
  22045. - Do not have tor-resolve automatically refuse all .onion addresses;
  22046. if AutomapHostsOnResolve is set in your torrc, this will work fine.
  22047. - Add a -p option to tor-resolve for specifying the SOCKS port: some
  22048. people find host:port too confusing.
  22049. - Print the SOCKS5 error message string as well as the error code
  22050. when a tor-resolve request fails. Patch from Jacob.
  22051. o Minor bugfixes (memory and resource management):
  22052. - Clients no longer cache certificates for authorities they do not
  22053. recognize. Bugfix on 0.2.0.9-alpha.
  22054. - Do not use C's stdio library for writing to log files. This will
  22055. improve logging performance by a minute amount, and will stop
  22056. leaking fds when our disk is full. Fixes bug 861.
  22057. - Stop erroneous use of O_APPEND in cases where we did not in fact
  22058. want to re-seek to the end of a file before every last write().
  22059. - Fix a small alignment and memory-wasting bug on buffer chunks.
  22060. Spotted by rovv.
  22061. - Add a malloc_good_size implementation to OpenBSD_malloc_linux.c,
  22062. to avoid unused RAM in buffer chunks and memory pools.
  22063. - Reduce the default smartlist size from 32 to 16; it turns out that
  22064. most smartlists hold around 8-12 elements tops.
  22065. - Make dumpstats() log the fullness and size of openssl-internal
  22066. buffers.
  22067. - If the user has applied the experimental SSL_MODE_RELEASE_BUFFERS
  22068. patch to their OpenSSL, turn it on to save memory on servers. This
  22069. patch will (with any luck) get included in a mainline distribution
  22070. before too long.
  22071. - Fix a memory leak when v3 directory authorities load their keys
  22072. and cert from disk. Bugfix on 0.2.0.1-alpha.
  22073. - Stop using malloc_usable_size() to use more area than we had
  22074. actually allocated: it was safe, but made valgrind really unhappy.
  22075. - Make the assert_circuit_ok() function work correctly on circuits that
  22076. have already been marked for close.
  22077. - Fix uninitialized size field for memory area allocation: may improve
  22078. memory performance during directory parsing.
  22079. o Minor bugfixes (clients):
  22080. - Stop reloading the router list from disk for no reason when we
  22081. run out of reachable directory mirrors. Once upon a time reloading
  22082. it would set the 'is_running' flag back to 1 for them. It hasn't
  22083. done that for a long time.
  22084. - When we had picked an exit node for a connection, but marked it as
  22085. "optional", and it turned out we had no onion key for the exit,
  22086. stop wanting that exit and try again. This situation may not
  22087. be possible now, but will probably become feasible with proposal
  22088. 158. Spotted by rovv. Fixes another case of bug 752.
  22089. - Fix a bug in address parsing that was preventing bridges or hidden
  22090. service targets from being at IPv6 addresses.
  22091. - Do not remove routers as too old if we do not have any consensus
  22092. document. Bugfix on 0.2.0.7-alpha.
  22093. - When an exit relay resolves a stream address to a local IP address,
  22094. do not just keep retrying that same exit relay over and
  22095. over. Instead, just close the stream. Addresses bug 872. Bugfix
  22096. on 0.2.0.32. Patch from rovv.
  22097. - Made Tor a little less aggressive about deleting expired
  22098. certificates. Partial fix for bug 854.
  22099. - Treat duplicate certificate fetches as failures, so that we do
  22100. not try to re-fetch an expired certificate over and over and over.
  22101. - Do not say we're fetching a certificate when we'll in fact skip it
  22102. because of a pending download.
  22103. - If we have correct permissions on $datadir, we complain to stdout
  22104. and fail to start. But dangerous permissions on
  22105. $datadir/cached-status/ would cause us to open a log and complain
  22106. there. Now complain to stdout and fail to start in both cases. Fixes
  22107. bug 820, reported by seeess.
  22108. o Minor bugfixes (bridges):
  22109. - When we made bridge authorities stop serving bridge descriptors over
  22110. unencrypted links, we also broke DirPort reachability testing for
  22111. bridges. So bridges with a non-zero DirPort were printing spurious
  22112. warns to their logs. Bugfix on 0.2.0.16-alpha. Fixes bug 709.
  22113. - Don't allow a bridge to publish its router descriptor to a
  22114. non-bridge directory authority. Fixes part of bug 932.
  22115. - When we change to or from being a bridge, reset our counts of
  22116. client usage by country. Fixes bug 932.
  22117. o Minor bugfixes (relays):
  22118. - Log correct error messages for DNS-related network errors on
  22119. Windows.
  22120. - Actually return -1 in the error case for read_bandwidth_usage().
  22121. Harmless bug, since we currently don't care about the return value
  22122. anywhere. Bugfix on 0.2.0.9-alpha.
  22123. - Provide a more useful log message if bug 977 (related to buffer
  22124. freelists) ever reappears, and do not crash right away.
  22125. - We were already rejecting relay begin cells with destination port
  22126. of 0. Now also reject extend cells with destination port or address
  22127. of 0. Suggested by lark.
  22128. - When we can't transmit a DNS request due to a network error, retry
  22129. it after a while, and eventually transmit a failing response to
  22130. the RESOLVED cell. Bugfix on 0.1.2.5-alpha.
  22131. - Solve a bug that kept hardware crypto acceleration from getting
  22132. enabled when accounting was turned on. Fixes bug 907. Bugfix on
  22133. 0.0.9pre6.
  22134. - When a canonical connection appears later in our internal list
  22135. than a noncanonical one for a given OR ID, always use the
  22136. canonical one. Bugfix on 0.2.0.12-alpha. Fixes bug 805.
  22137. Spotted by rovv.
  22138. - Avoid some nasty corner cases in the logic for marking connections
  22139. as too old or obsolete or noncanonical for circuits. Partial
  22140. bugfix on bug 891.
  22141. - Fix another interesting corner-case of bug 891 spotted by rovv:
  22142. Previously, if two hosts had different amounts of clock drift, and
  22143. one of them created a new connection with just the wrong timing,
  22144. the other might decide to deprecate the new connection erroneously.
  22145. Bugfix on 0.1.1.13-alpha.
  22146. - If one win32 nameserver fails to get added, continue adding the
  22147. rest, and don't automatically fail.
  22148. - Fix a bug where an unreachable relay would establish enough
  22149. reachability testing circuits to do a bandwidth test -- if
  22150. we already have a connection to the middle hop of the testing
  22151. circuit, then it could establish the last hop by using the existing
  22152. connection. Bugfix on 0.1.2.2-alpha, exposed when we made testing
  22153. circuits no longer use entry guards in 0.2.1.3-alpha.
  22154. o Minor bugfixes (directory authorities):
  22155. - Limit uploaded directory documents to be 16M rather than 500K.
  22156. The directory authorities were refusing v3 consensus votes from
  22157. other authorities, since the votes are now 504K. Fixes bug 959;
  22158. bugfix on 0.0.2pre17 (where we raised it from 50K to 500K ;).
  22159. - Directory authorities should never send a 503 "busy" response to
  22160. requests for votes or keys. Bugfix on 0.2.0.8-alpha; exposed by
  22161. bug 959.
  22162. - Fix code so authorities _actually_ send back X-Descriptor-Not-New
  22163. headers. Bugfix on 0.2.0.10-alpha.
  22164. o Minor bugfixes (hidden services):
  22165. - When we can't find an intro key for a v2 hidden service descriptor,
  22166. fall back to the v0 hidden service descriptor and log a bug message.
  22167. Workaround for bug 1024.
  22168. - In very rare situations new hidden service descriptors were
  22169. published earlier than 30 seconds after the last change to the
  22170. service. (We currently think that a hidden service descriptor
  22171. that's been stable for 30 seconds is worth publishing.)
  22172. - If a hidden service sends us an END cell, do not consider
  22173. retrying the connection; just close it. Patch from rovv.
  22174. - If we are not using BEGIN_DIR cells, don't attempt to contact hidden
  22175. service directories if they have no advertised dir port. Bugfix
  22176. on 0.2.0.10-alpha.
  22177. o Minor bugfixes (tools):
  22178. - In the torify(1) manpage, mention that tsocks will leak your
  22179. DNS requests.
  22180. o Minor bugfixes (controllers):
  22181. - If the controller claimed responsibility for a stream, but that
  22182. stream never finished making its connection, it would live
  22183. forever in circuit_wait state. Now we close it after SocksTimeout
  22184. seconds. Bugfix on 0.1.2.7-alpha; reported by Mike Perry.
  22185. - Make DNS resolved controller events into "CLOSED", not
  22186. "FAILED". Bugfix on 0.1.2.5-alpha. Fix by Robert Hogan. Resolves
  22187. bug 807.
  22188. - The control port would close the connection before flushing long
  22189. replies, such as the network consensus, if a QUIT command was issued
  22190. before the reply had completed. Now, the control port flushes all
  22191. pending replies before closing the connection. Also fix a spurious
  22192. warning when a QUIT command is issued after a malformed or rejected
  22193. AUTHENTICATE command, but before the connection was closed. Patch
  22194. by Marcus Griep. Fixes bugs 1015 and 1016.
  22195. - Fix a bug that made stream bandwidth get misreported to the
  22196. controller.
  22197. o Deprecated and removed features:
  22198. - The old "tor --version --version" command, which would print out
  22199. the subversion "Id" of most of the source files, is now removed. It
  22200. turned out to be less useful than we'd expected, and harder to
  22201. maintain.
  22202. - RedirectExits has been removed. It was deprecated since
  22203. 0.2.0.3-alpha.
  22204. - Finally remove deprecated "EXTENDED_FORMAT" controller feature. It
  22205. has been called EXTENDED_EVENTS since 0.1.2.4-alpha.
  22206. - Cell pools are now always enabled; --disable-cell-pools is ignored.
  22207. - Directory mirrors no longer fetch the v1 directory or
  22208. running-routers files. They are obsolete, and nobody asks for them
  22209. anymore. This is the first step to making v1 authorities obsolete.
  22210. - Take out the TestVia config option, since it was a workaround for
  22211. a bug that was fixed in Tor 0.1.1.21.
  22212. - Mark RendNodes, RendExcludeNodes, HiddenServiceNodes, and
  22213. HiddenServiceExcludeNodes as obsolete: they never worked properly,
  22214. and nobody seems to be using them. Fixes bug 754. Bugfix on
  22215. 0.1.0.1-rc. Patch from Christian Wilms.
  22216. - Remove all backward-compatibility code for relays running
  22217. versions of Tor so old that they no longer work at all on the
  22218. Tor network.
  22219. o Code simplifications and refactoring:
  22220. - Tool-assisted documentation cleanup. Nearly every function or
  22221. static variable in Tor should have its own documentation now.
  22222. - Rename the confusing or_is_obsolete field to the more appropriate
  22223. is_bad_for_new_circs, and move it to or_connection_t where it
  22224. belongs.
  22225. - Move edge-only flags from connection_t to edge_connection_t: not
  22226. only is this better coding, but on machines of plausible alignment,
  22227. it should save 4-8 bytes per connection_t. "Every little bit helps."
  22228. - Rename ServerDNSAllowBrokenResolvConf to ServerDNSAllowBrokenConfig
  22229. for consistency; keep old option working for backward compatibility.
  22230. - Simplify the code for finding connections to use for a circuit.
  22231. - Revise the connection_new functions so that a more typesafe variant
  22232. exists. This will work better with Coverity, and let us find any
  22233. actual mistakes we're making here.
  22234. - Refactor unit testing logic so that dmalloc can be used sensibly
  22235. with unit tests to check for memory leaks.
  22236. - Move all hidden-service related fields from connection and circuit
  22237. structure to substructures: this way they won't eat so much memory.
  22238. - Squeeze 2-5% out of client performance (according to oprofile) by
  22239. improving the implementation of some policy-manipulation functions.
  22240. - Change the implementation of ExcludeNodes and ExcludeExitNodes to
  22241. be more efficient. Formerly it was quadratic in the number of
  22242. servers; now it should be linear. Fixes bug 509.
  22243. - Save 16-22 bytes per open circuit by moving the n_addr, n_port,
  22244. and n_conn_id_digest fields into a separate structure that's
  22245. only needed when the circuit has not yet attached to an n_conn.
  22246. - Optimize out calls to time(NULL) that occur for every IO operation,
  22247. or for every cell. On systems like Windows where time() is a
  22248. slow syscall, this fix will be slightly helpful.
  22249. Changes in version 0.2.0.35 - 2009-06-24
  22250. o Security fix:
  22251. - Avoid crashing in the presence of certain malformed descriptors.
  22252. Found by lark, and by automated fuzzing.
  22253. - Fix an edge case where a malicious exit relay could convince a
  22254. controller that the client's DNS question resolves to an internal IP
  22255. address. Bug found and fixed by "optimist"; bugfix on 0.1.2.8-beta.
  22256. o Major bugfixes:
  22257. - Finally fix the bug where dynamic-IP relays disappear when their
  22258. IP address changes: directory mirrors were mistakenly telling
  22259. them their old address if they asked via begin_dir, so they
  22260. never got an accurate answer about their new address, so they
  22261. just vanished after a day. For belt-and-suspenders, relays that
  22262. don't set Address in their config now avoid using begin_dir for
  22263. all direct connections. Should fix bugs 827, 883, and 900.
  22264. - Fix a timing-dependent, allocator-dependent, DNS-related crash bug
  22265. that would occur on some exit nodes when DNS failures and timeouts
  22266. occurred in certain patterns. Fix for bug 957.
  22267. o Minor bugfixes:
  22268. - When starting with a cache over a few days old, do not leak
  22269. memory for the obsolete router descriptors in it. Bugfix on
  22270. 0.2.0.33; fixes bug 672.
  22271. - Hidden service clients didn't use a cached service descriptor that
  22272. was older than 15 minutes, but wouldn't fetch a new one either,
  22273. because there was already one in the cache. Now, fetch a v2
  22274. descriptor unless the same descriptor was added to the cache within
  22275. the last 15 minutes. Fixes bug 997; reported by Marcus Griep.
  22276. Changes in version 0.2.0.34 - 2009-02-08
  22277. Tor 0.2.0.34 features several more security-related fixes. You should
  22278. upgrade, especially if you run an exit relay (remote crash) or a
  22279. directory authority (remote infinite loop), or you're on an older
  22280. (pre-XP) or not-recently-patched Windows (remote exploit).
  22281. This release marks end-of-life for Tor 0.1.2.x. Those Tor versions
  22282. have many known flaws, and nobody should be using them. You should
  22283. upgrade. If you're using a Linux or BSD and its packages are obsolete,
  22284. stop using those packages and upgrade anyway.
  22285. o Security fixes:
  22286. - Fix an infinite-loop bug on handling corrupt votes under certain
  22287. circumstances. Bugfix on 0.2.0.8-alpha.
  22288. - Fix a temporary DoS vulnerability that could be performed by
  22289. a directory mirror. Bugfix on 0.2.0.9-alpha; reported by lark.
  22290. - Avoid a potential crash on exit nodes when processing malformed
  22291. input. Remote DoS opportunity. Bugfix on 0.2.0.33.
  22292. - Do not accept incomplete ipv4 addresses (like 192.168.0) as valid.
  22293. Spec conformance issue. Bugfix on Tor 0.0.2pre27.
  22294. o Minor bugfixes:
  22295. - Fix compilation on systems where time_t is a 64-bit integer.
  22296. Patch from Matthias Drochner.
  22297. - Don't consider expiring already-closed client connections. Fixes
  22298. bug 893. Bugfix on 0.0.2pre20.
  22299. Changes in version 0.2.0.33 - 2009-01-21
  22300. Tor 0.2.0.33 fixes a variety of bugs that were making relays less
  22301. useful to users. It also finally fixes a bug where a relay or client
  22302. that's been off for many days would take a long time to bootstrap.
  22303. This update also fixes an important security-related bug reported by
  22304. Ilja van Sprundel. You should upgrade. (We'll send out more details
  22305. about the bug once people have had some time to upgrade.)
  22306. o Security fixes:
  22307. - Fix a heap-corruption bug that may be remotely triggerable on
  22308. some platforms. Reported by Ilja van Sprundel.
  22309. o Major bugfixes:
  22310. - When a stream at an exit relay is in state "resolving" or
  22311. "connecting" and it receives an "end" relay cell, the exit relay
  22312. would silently ignore the end cell and not close the stream. If
  22313. the client never closes the circuit, then the exit relay never
  22314. closes the TCP connection. Bug introduced in Tor 0.1.2.1-alpha;
  22315. reported by "wood".
  22316. - When sending CREATED cells back for a given circuit, use a 64-bit
  22317. connection ID to find the right connection, rather than an addr:port
  22318. combination. Now that we can have multiple OR connections between
  22319. the same ORs, it is no longer possible to use addr:port to uniquely
  22320. identify a connection.
  22321. - Bridge relays that had DirPort set to 0 would stop fetching
  22322. descriptors shortly after startup, and then briefly resume
  22323. after a new bandwidth test and/or after publishing a new bridge
  22324. descriptor. Bridge users that try to bootstrap from them would
  22325. get a recent networkstatus but would get descriptors from up to
  22326. 18 hours earlier, meaning most of the descriptors were obsolete
  22327. already. Reported by Tas; bugfix on 0.2.0.13-alpha.
  22328. - Prevent bridge relays from serving their 'extrainfo' document
  22329. to anybody who asks, now that extrainfo docs include potentially
  22330. sensitive aggregated client geoip summaries. Bugfix on
  22331. 0.2.0.13-alpha.
  22332. - If the cached networkstatus consensus is more than five days old,
  22333. discard it rather than trying to use it. In theory it could be
  22334. useful because it lists alternate directory mirrors, but in practice
  22335. it just means we spend many minutes trying directory mirrors that
  22336. are long gone from the network. Also discard router descriptors as
  22337. we load them if they are more than five days old, since the onion
  22338. key is probably wrong by now. Bugfix on 0.2.0.x. Fixes bug 887.
  22339. o Minor bugfixes:
  22340. - Do not mark smartlist_bsearch_idx() function as ATTR_PURE. This bug
  22341. could make gcc generate non-functional binary search code. Bugfix
  22342. on 0.2.0.10-alpha.
  22343. - Build correctly on platforms without socklen_t.
  22344. - Compile without warnings on solaris.
  22345. - Avoid potential crash on internal error during signature collection.
  22346. Fixes bug 864. Patch from rovv.
  22347. - Correct handling of possible malformed authority signing key
  22348. certificates with internal signature types. Fixes bug 880.
  22349. Bugfix on 0.2.0.3-alpha.
  22350. - Fix a hard-to-trigger resource leak when logging credential status.
  22351. CID 349.
  22352. - When we can't initialize DNS because the network is down, do not
  22353. automatically stop Tor from starting. Instead, we retry failed
  22354. dns_init() every 10 minutes, and change the exit policy to reject
  22355. *:* until one succeeds. Fixes bug 691.
  22356. - Use 64 bits instead of 32 bits for connection identifiers used with
  22357. the controller protocol, to greatly reduce risk of identifier reuse.
  22358. - When we're choosing an exit node for a circuit, and we have
  22359. no pending streams, choose a good general exit rather than one that
  22360. supports "all the pending streams". Bugfix on 0.1.1.x. Fix by rovv.
  22361. - Fix another case of assuming, when a specific exit is requested,
  22362. that we know more than the user about what hosts it allows.
  22363. Fixes one case of bug 752. Patch from rovv.
  22364. - Clip the MaxCircuitDirtiness config option to a minimum of 10
  22365. seconds. Warn the user if lower values are given in the
  22366. configuration. Bugfix on 0.1.0.1-rc. Patch by Sebastian.
  22367. - Clip the CircuitBuildTimeout to a minimum of 30 seconds. Warn the
  22368. user if lower values are given in the configuration. Bugfix on
  22369. 0.1.1.17-rc. Patch by Sebastian.
  22370. - Fix a memory leak when we decline to add a v2 rendezvous descriptor to
  22371. the cache because we already had a v0 descriptor with the same ID.
  22372. Bugfix on 0.2.0.18-alpha.
  22373. - Fix a race condition when freeing keys shared between main thread
  22374. and CPU workers that could result in a memory leak. Bugfix on
  22375. 0.1.0.1-rc. Fixes bug 889.
  22376. - Send a valid END cell back when a client tries to connect to a
  22377. nonexistent hidden service port. Bugfix on 0.1.2.15. Fixes bug
  22378. 840. Patch from rovv.
  22379. - Check which hops rendezvous stream cells are associated with to
  22380. prevent possible guess-the-streamid injection attacks from
  22381. intermediate hops. Fixes another case of bug 446. Based on patch
  22382. from rovv.
  22383. - If a broken client asks a non-exit router to connect somewhere,
  22384. do not even do the DNS lookup before rejecting the connection.
  22385. Fixes another case of bug 619. Patch from rovv.
  22386. - When a relay gets a create cell it can't decrypt (e.g. because it's
  22387. using the wrong onion key), we were dropping it and letting the
  22388. client time out. Now actually answer with a destroy cell. Fixes
  22389. bug 904. Bugfix on 0.0.2pre8.
  22390. o Minor bugfixes (hidden services):
  22391. - Do not throw away existing introduction points on SIGHUP. Bugfix on
  22392. 0.0.6pre1. Patch by Karsten. Fixes bug 874.
  22393. o Minor features:
  22394. - Report the case where all signatures in a detached set are rejected
  22395. differently than the case where there is an error handling the
  22396. detached set.
  22397. - When we realize that another process has modified our cached
  22398. descriptors, print out a more useful error message rather than
  22399. triggering an assertion. Fixes bug 885. Patch from Karsten.
  22400. - Implement the 0x20 hack to better resist DNS poisoning: set the
  22401. case on outgoing DNS requests randomly, and reject responses that do
  22402. not match the case correctly. This logic can be disabled with the
  22403. ServerDNSRandomizeCase setting, if you are using one of the 0.3%
  22404. of servers that do not reliably preserve case in replies. See
  22405. "Increased DNS Forgery Resistance through 0x20-Bit Encoding"
  22406. for more info.
  22407. - Check DNS replies for more matching fields to better resist DNS
  22408. poisoning.
  22409. - Never use OpenSSL compression: it wastes RAM and CPU trying to
  22410. compress cells, which are basically all encrypted, compressed, or
  22411. both.
  22412. Changes in version 0.2.0.32 - 2008-11-20
  22413. Tor 0.2.0.32 fixes a major security problem in Debian and Ubuntu
  22414. packages (and maybe other packages) noticed by Theo de Raadt, fixes
  22415. a smaller security flaw that might allow an attacker to access local
  22416. services, further improves hidden service performance, and fixes a
  22417. variety of other issues.
  22418. o Security fixes:
  22419. - The "User" and "Group" config options did not clear the
  22420. supplementary group entries for the Tor process. The "User" option
  22421. is now more robust, and we now set the groups to the specified
  22422. user's primary group. The "Group" option is now ignored. For more
  22423. detailed logging on credential switching, set CREDENTIAL_LOG_LEVEL
  22424. in common/compat.c to LOG_NOTICE or higher. Patch by Jacob Appelbaum
  22425. and Steven Murdoch. Bugfix on 0.0.2pre14. Fixes bug 848 and 857.
  22426. - The "ClientDNSRejectInternalAddresses" config option wasn't being
  22427. consistently obeyed: if an exit relay refuses a stream because its
  22428. exit policy doesn't allow it, we would remember what IP address
  22429. the relay said the destination address resolves to, even if it's
  22430. an internal IP address. Bugfix on 0.2.0.7-alpha; patch by rovv.
  22431. o Major bugfixes:
  22432. - Fix a DOS opportunity during the voting signature collection process
  22433. at directory authorities. Spotted by rovv. Bugfix on 0.2.0.x.
  22434. o Major bugfixes (hidden services):
  22435. - When fetching v0 and v2 rendezvous service descriptors in parallel,
  22436. we were failing the whole hidden service request when the v0
  22437. descriptor fetch fails, even if the v2 fetch is still pending and
  22438. might succeed. Similarly, if the last v2 fetch fails, we were
  22439. failing the whole hidden service request even if a v0 fetch is
  22440. still pending. Fixes bug 814. Bugfix on 0.2.0.10-alpha.
  22441. - When extending a circuit to a hidden service directory to upload a
  22442. rendezvous descriptor using a BEGIN_DIR cell, almost 1/6 of all
  22443. requests failed, because the router descriptor has not been
  22444. downloaded yet. In these cases, do not attempt to upload the
  22445. rendezvous descriptor, but wait until the router descriptor is
  22446. downloaded and retry. Likewise, do not attempt to fetch a rendezvous
  22447. descriptor from a hidden service directory for which the router
  22448. descriptor has not yet been downloaded. Fixes bug 767. Bugfix
  22449. on 0.2.0.10-alpha.
  22450. o Minor bugfixes:
  22451. - Fix several infrequent memory leaks spotted by Coverity.
  22452. - When testing for libevent functions, set the LDFLAGS variable
  22453. correctly. Found by Riastradh.
  22454. - Avoid a bug where the FastFirstHopPK 0 option would keep Tor from
  22455. bootstrapping with tunneled directory connections. Bugfix on
  22456. 0.1.2.5-alpha. Fixes bug 797. Found by Erwin Lam.
  22457. - When asked to connect to A.B.exit:80, if we don't know the IP for A
  22458. and we know that server B rejects most-but-not all connections to
  22459. port 80, we would previously reject the connection. Now, we assume
  22460. the user knows what they were asking for. Fixes bug 752. Bugfix
  22461. on 0.0.9rc5. Diagnosed by BarkerJr.
  22462. - If we overrun our per-second write limits a little, count this as
  22463. having used up our write allocation for the second, and choke
  22464. outgoing directory writes. Previously, we had only counted this when
  22465. we had met our limits precisely. Fixes bug 824. Patch from by rovv.
  22466. Bugfix on 0.2.0.x (??).
  22467. - Remove the old v2 directory authority 'lefkada' from the default
  22468. list. It has been gone for many months.
  22469. - Stop doing unaligned memory access that generated bus errors on
  22470. sparc64. Bugfix on 0.2.0.10-alpha. Fixes bug 862.
  22471. - Make USR2 log-level switch take effect immediately. Bugfix on
  22472. 0.1.2.8-beta.
  22473. o Minor bugfixes (controller):
  22474. - Make DNS resolved events into "CLOSED", not "FAILED". Bugfix on
  22475. 0.1.2.5-alpha. Fix by Robert Hogan. Resolves bug 807.
  22476. Changes in version 0.2.0.31 - 2008-09-03
  22477. Tor 0.2.0.31 addresses two potential anonymity issues, starts to fix
  22478. a big bug we're seeing where in rare cases traffic from one Tor stream
  22479. gets mixed into another stream, and fixes a variety of smaller issues.
  22480. o Major bugfixes:
  22481. - Make sure that two circuits can never exist on the same connection
  22482. with the same circuit ID, even if one is marked for close. This
  22483. is conceivably a bugfix for bug 779. Bugfix on 0.1.0.4-rc.
  22484. - Relays now reject risky extend cells: if the extend cell includes
  22485. a digest of all zeroes, or asks to extend back to the relay that
  22486. sent the extend cell, tear down the circuit. Ideas suggested
  22487. by rovv.
  22488. - If not enough of our entry guards are available so we add a new
  22489. one, we might use the new one even if it overlapped with the
  22490. current circuit's exit relay (or its family). Anonymity bugfix
  22491. pointed out by rovv.
  22492. o Minor bugfixes:
  22493. - Recover 3-7 bytes that were wasted per memory chunk. Fixes bug
  22494. 794; bug spotted by rovv. Bugfix on 0.2.0.1-alpha.
  22495. - Correctly detect the presence of the linux/netfilter_ipv4.h header
  22496. when building against recent kernels. Bugfix on 0.1.2.1-alpha.
  22497. - Pick size of default geoip filename string correctly on windows.
  22498. Fixes bug 806. Bugfix on 0.2.0.30.
  22499. - Make the autoconf script accept the obsolete --with-ssl-dir
  22500. option as an alias for the actually-working --with-openssl-dir
  22501. option. Fix the help documentation to recommend --with-openssl-dir.
  22502. Based on a patch by "Dave". Bugfix on 0.2.0.1-alpha.
  22503. - When using the TransPort option on OpenBSD, and using the User
  22504. option to change UID and drop privileges, make sure to open
  22505. /dev/pf before dropping privileges. Fixes bug 782. Patch from
  22506. Christopher Davis. Bugfix on 0.1.2.1-alpha.
  22507. - Try to attach connections immediately upon receiving a RENDEZVOUS2
  22508. or RENDEZVOUS_ESTABLISHED cell. This can save a second or two
  22509. on the client side when connecting to a hidden service. Bugfix
  22510. on 0.0.6pre1. Found and fixed by Christian Wilms; resolves bug 743.
  22511. - When closing an application-side connection because its circuit is
  22512. getting torn down, generate the stream event correctly. Bugfix on
  22513. 0.1.2.x. Anonymous patch.
  22514. Changes in version 0.2.0.30 - 2008-07-15
  22515. This new stable release switches to a more efficient directory
  22516. distribution design, adds features to make connections to the Tor
  22517. network harder to block, allows Tor to act as a DNS proxy, adds separate
  22518. rate limiting for relayed traffic to make it easier for clients to
  22519. become relays, fixes a variety of potential anonymity problems, and
  22520. includes the usual huge pile of other features and bug fixes.
  22521. o New v3 directory design:
  22522. - Tor now uses a new way to learn about and distribute information
  22523. about the network: the directory authorities vote on a common
  22524. network status document rather than each publishing their own
  22525. opinion. Now clients and caches download only one networkstatus
  22526. document to bootstrap, rather than downloading one for each
  22527. authority. Clients only download router descriptors listed in
  22528. the consensus. Implements proposal 101; see doc/spec/dir-spec.txt
  22529. for details.
  22530. - Set up moria1, tor26, and dizum as v3 directory authorities
  22531. in addition to being v2 authorities. Also add three new ones:
  22532. ides (run by Mike Perry), gabelmoo (run by Karsten Loesing), and
  22533. dannenberg (run by CCC).
  22534. - Switch to multi-level keys for directory authorities: now their
  22535. long-term identity key can be kept offline, and they periodically
  22536. generate a new signing key. Clients fetch the "key certificates"
  22537. to keep up to date on the right keys. Add a standalone tool
  22538. "tor-gencert" to generate key certificates. Implements proposal 103.
  22539. - Add a new V3AuthUseLegacyKey config option to make it easier for
  22540. v3 authorities to change their identity keys if another bug like
  22541. Debian's OpenSSL RNG flaw appears.
  22542. - Authorities and caches fetch the v2 networkstatus documents
  22543. less often, now that v3 is recommended.
  22544. o Make Tor connections stand out less on the wire:
  22545. - Use an improved TLS handshake designed by Steven Murdoch in proposal
  22546. 124, as revised in proposal 130. The new handshake is meant to
  22547. be harder for censors to fingerprint, and it adds the ability
  22548. to detect certain kinds of man-in-the-middle traffic analysis
  22549. attacks. The new handshake format includes version negotiation for
  22550. OR connections as described in proposal 105, which will allow us
  22551. to improve Tor's link protocol more safely in the future.
  22552. - Enable encrypted directory connections by default for non-relays,
  22553. so censor tools that block Tor directory connections based on their
  22554. plaintext patterns will no longer work. This means Tor works in
  22555. certain censored countries by default again.
  22556. - Stop including recognizeable strings in the commonname part of
  22557. Tor's x509 certificates.
  22558. o Implement bridge relays:
  22559. - Bridge relays (or "bridges" for short) are Tor relays that aren't
  22560. listed in the main Tor directory. Since there is no complete public
  22561. list of them, even an ISP that is filtering connections to all the
  22562. known Tor relays probably won't be able to block all the bridges.
  22563. See doc/design-paper/blocking.pdf and proposal 125 for details.
  22564. - New config option BridgeRelay that specifies you want to be a
  22565. bridge relay rather than a normal relay. When BridgeRelay is set
  22566. to 1, then a) you cache dir info even if your DirPort ins't on,
  22567. and b) the default for PublishServerDescriptor is now "bridge"
  22568. rather than "v2,v3".
  22569. - New config option "UseBridges 1" for clients that want to use bridge
  22570. relays instead of ordinary entry guards. Clients then specify
  22571. bridge relays by adding "Bridge" lines to their config file. Users
  22572. can learn about a bridge relay either manually through word of
  22573. mouth, or by one of our rate-limited mechanisms for giving out
  22574. bridge addresses without letting an attacker easily enumerate them
  22575. all. See https://www.torproject.org/bridges for details.
  22576. - Bridge relays behave like clients with respect to time intervals
  22577. for downloading new v3 consensus documents -- otherwise they
  22578. stand out. Bridge users now wait until the end of the interval,
  22579. so their bridge relay will be sure to have a new consensus document.
  22580. o Implement bridge directory authorities:
  22581. - Bridge authorities are like normal directory authorities, except
  22582. they don't serve a list of known bridges. Therefore users that know
  22583. a bridge's fingerprint can fetch a relay descriptor for that bridge,
  22584. including fetching updates e.g. if the bridge changes IP address,
  22585. yet an attacker can't just fetch a list of all the bridges.
  22586. - Set up Tonga as the default bridge directory authority.
  22587. - Bridge authorities refuse to serve bridge descriptors or other
  22588. bridge information over unencrypted connections (that is, when
  22589. responding to direct DirPort requests rather than begin_dir cells.)
  22590. - Bridge directory authorities do reachability testing on the
  22591. bridges they know. They provide router status summaries to the
  22592. controller via "getinfo ns/purpose/bridge", and also dump summaries
  22593. to a file periodically, so we can keep internal stats about which
  22594. bridges are functioning.
  22595. - If bridge users set the UpdateBridgesFromAuthority config option,
  22596. but the digest they ask for is a 404 on the bridge authority,
  22597. they fall back to contacting the bridge directly.
  22598. - Bridges always use begin_dir to publish their server descriptor to
  22599. the bridge authority using an anonymous encrypted tunnel.
  22600. - Early work on a "bridge community" design: if bridge authorities set
  22601. the BridgePassword config option, they will serve a snapshot of
  22602. known bridge routerstatuses from their DirPort to anybody who
  22603. knows that password. Unset by default.
  22604. - Tor now includes an IP-to-country GeoIP file, so bridge relays can
  22605. report sanitized aggregated summaries in their extra-info documents
  22606. privately to the bridge authority, listing which countries are
  22607. able to reach them. We hope this mechanism will let us learn when
  22608. certain countries start trying to block bridges.
  22609. - Bridge authorities write bridge descriptors to disk, so they can
  22610. reload them after a reboot. They can also export the descriptors
  22611. to other programs, so we can distribute them to blocked users via
  22612. the BridgeDB interface, e.g. via https://bridges.torproject.org/
  22613. and bridges@torproject.org.
  22614. o Tor can be a DNS proxy:
  22615. - The new client-side DNS proxy feature replaces the need for
  22616. dns-proxy-tor: Just set "DNSPort 9999", and Tor will now listen
  22617. for DNS requests on port 9999, use the Tor network to resolve them
  22618. anonymously, and send the reply back like a regular DNS server.
  22619. The code still only implements a subset of DNS.
  22620. - Add a new AutomapHostsOnResolve option: when it is enabled, any
  22621. resolve request for hosts matching a given pattern causes Tor to
  22622. generate an internal virtual address mapping for that host. This
  22623. allows DNSPort to work sensibly with hidden service users. By
  22624. default, .exit and .onion addresses are remapped; the list of
  22625. patterns can be reconfigured with AutomapHostsSuffixes.
  22626. - Add an "-F" option to tor-resolve to force a resolve for a .onion
  22627. address. Thanks to the AutomapHostsOnResolve option, this is no
  22628. longer a completely silly thing to do.
  22629. o Major features (relay usability):
  22630. - New config options RelayBandwidthRate and RelayBandwidthBurst:
  22631. a separate set of token buckets for relayed traffic. Right now
  22632. relayed traffic is defined as answers to directory requests, and
  22633. OR connections that don't have any local circuits on them. See
  22634. proposal 111 for details.
  22635. - Create listener connections before we setuid to the configured
  22636. User and Group. Now non-Windows users can choose port values
  22637. under 1024, start Tor as root, and have Tor bind those ports
  22638. before it changes to another UID. (Windows users could already
  22639. pick these ports.)
  22640. - Added a new ConstrainedSockets config option to set SO_SNDBUF and
  22641. SO_RCVBUF on TCP sockets. Hopefully useful for Tor servers running
  22642. on "vserver" accounts. Patch from coderman.
  22643. o Major features (directory authorities):
  22644. - Directory authorities track weighted fractional uptime and weighted
  22645. mean-time-between failures for relays. WFU is suitable for deciding
  22646. whether a node is "usually up", while MTBF is suitable for deciding
  22647. whether a node is "likely to stay up." We need both, because
  22648. "usually up" is a good requirement for guards, while "likely to
  22649. stay up" is a good requirement for long-lived connections.
  22650. - Directory authorities use a new formula for selecting which relays
  22651. to advertise as Guards: they must be in the top 7/8 in terms of
  22652. how long we have known about them, and above the median of those
  22653. nodes in terms of weighted fractional uptime.
  22654. - Directory authorities use a new formula for selecting which relays
  22655. to advertise as Stable: when we have 4 or more days of data, use
  22656. median measured MTBF rather than median declared uptime. Implements
  22657. proposal 108.
  22658. - Directory authorities accept and serve "extra info" documents for
  22659. routers. Routers now publish their bandwidth-history lines in the
  22660. extra-info docs rather than the main descriptor. This step saves
  22661. 60% (!) on compressed router descriptor downloads. Servers upload
  22662. extra-info docs to any authority that accepts them; directory
  22663. authorities now allow multiple router descriptors and/or extra
  22664. info documents to be uploaded in a single go. Authorities, and
  22665. caches that have been configured to download extra-info documents,
  22666. download them as needed. Implements proposal 104.
  22667. - Authorities now list relays who have the same nickname as
  22668. a different named relay, but list them with a new flag:
  22669. "Unnamed". Now we can make use of relays that happen to pick the
  22670. same nickname as a server that registered two years ago and then
  22671. disappeared. Implements proposal 122.
  22672. - Store routers in a file called cached-descriptors instead of in
  22673. cached-routers. Initialize cached-descriptors from cached-routers
  22674. if the old format is around. The new format allows us to store
  22675. annotations along with descriptors, to record the time we received
  22676. each descriptor, its source, and its purpose: currently one of
  22677. general, controller, or bridge.
  22678. o Major features (other):
  22679. - New config options WarnPlaintextPorts and RejectPlaintextPorts so
  22680. Tor can warn and/or refuse connections to ports commonly used with
  22681. vulnerable-plaintext protocols. Currently we warn on ports 23,
  22682. 109, 110, and 143, but we don't reject any. Based on proposal 129
  22683. by Kevin Bauer and Damon McCoy.
  22684. - Integrate Karsten Loesing's Google Summer of Code project to publish
  22685. hidden service descriptors on a set of redundant relays that are a
  22686. function of the hidden service address. Now we don't have to rely
  22687. on three central hidden service authorities for publishing and
  22688. fetching every hidden service descriptor. Implements proposal 114.
  22689. - Allow tunnelled directory connections to ask for an encrypted
  22690. "begin_dir" connection or an anonymized "uses a full Tor circuit"
  22691. connection independently. Now we can make anonymized begin_dir
  22692. connections for (e.g.) more secure hidden service posting and
  22693. fetching.
  22694. o Major bugfixes (crashes and assert failures):
  22695. - Stop imposing an arbitrary maximum on the number of file descriptors
  22696. used for busy servers. Bug reported by Olaf Selke; patch from
  22697. Sebastian Hahn.
  22698. - Avoid possible failures when generating a directory with routers
  22699. with over-long versions strings, or too many flags set.
  22700. - Fix a rare assert error when we're closing one of our threads:
  22701. use a mutex to protect the list of logs, so we never write to the
  22702. list as it's being freed. Fixes the very rare bug 575, which is
  22703. kind of the revenge of bug 222.
  22704. - Avoid segfault in the case where a badly behaved v2 versioning
  22705. directory sends a signed networkstatus with missing client-versions.
  22706. - When we hit an EOF on a log (probably because we're shutting down),
  22707. don't try to remove the log from the list: just mark it as
  22708. unusable. (Bulletproofs against bug 222.)
  22709. o Major bugfixes (code security fixes):
  22710. - Detect size overflow in zlib code. Reported by Justin Ferguson and
  22711. Dan Kaminsky.
  22712. - Rewrite directory tokenization code to never run off the end of
  22713. a string. Fixes bug 455. Patch from croup.
  22714. - Be more paranoid about overwriting sensitive memory on free(),
  22715. as a defensive programming tactic to ensure forward secrecy.
  22716. o Major bugfixes (anonymity fixes):
  22717. - Reject requests for reverse-dns lookup of names that are in
  22718. a private address space. Patch from lodger.
  22719. - Never report that we've used more bandwidth than we're willing to
  22720. relay: it leaks how much non-relay traffic we're using. Resolves
  22721. bug 516.
  22722. - As a client, do not believe any server that tells us that an
  22723. address maps to an internal address space.
  22724. - Warn about unsafe ControlPort configurations.
  22725. - Directory authorities now call routers Fast if their bandwidth is
  22726. at least 100KB/s, and consider their bandwidth adequate to be a
  22727. Guard if it is at least 250KB/s, no matter the medians. This fix
  22728. complements proposal 107.
  22729. - Directory authorities now never mark more than 2 servers per IP as
  22730. Valid and Running (or 5 on addresses shared by authorities).
  22731. Implements proposal 109, by Kevin Bauer and Damon McCoy.
  22732. - If we're a relay, avoid picking ourselves as an introduction point,
  22733. a rendezvous point, or as the final hop for internal circuits. Bug
  22734. reported by taranis and lodger.
  22735. - Exit relays that are used as a client can now reach themselves
  22736. using the .exit notation, rather than just launching an infinite
  22737. pile of circuits. Fixes bug 641. Reported by Sebastian Hahn.
  22738. - Fix a bug where, when we were choosing the 'end stream reason' to
  22739. put in our relay end cell that we send to the exit relay, Tor
  22740. clients on Windows were sometimes sending the wrong 'reason'. The
  22741. anonymity problem is that exit relays may be able to guess whether
  22742. the client is running Windows, thus helping partition the anonymity
  22743. set. Down the road we should stop sending reasons to exit relays,
  22744. or otherwise prevent future versions of this bug.
  22745. - Only update guard status (usable / not usable) once we have
  22746. enough directory information. This was causing us to discard all our
  22747. guards on startup if we hadn't been running for a few weeks. Fixes
  22748. bug 448.
  22749. - When our directory information has been expired for a while, stop
  22750. being willing to build circuits using it. Fixes bug 401.
  22751. o Major bugfixes (peace of mind for relay operators)
  22752. - Non-exit relays no longer answer "resolve" relay cells, so they
  22753. can't be induced to do arbitrary DNS requests. (Tor clients already
  22754. avoid using non-exit relays for resolve cells, but now servers
  22755. enforce this too.) Fixes bug 619. Patch from lodger.
  22756. - When we setconf ClientOnly to 1, close any current OR and Dir
  22757. listeners. Reported by mwenge.
  22758. o Major bugfixes (other):
  22759. - If we only ever used Tor for hidden service lookups or posts, we
  22760. would stop building circuits and start refusing connections after
  22761. 24 hours, since we falsely believed that Tor was dormant. Reported
  22762. by nwf.
  22763. - Add a new __HashedControlSessionPassword option for controllers
  22764. to use for one-off session password hashes that shouldn't get
  22765. saved to disk by SAVECONF --- Vidalia users were accumulating a
  22766. pile of HashedControlPassword lines in their torrc files, one for
  22767. each time they had restarted Tor and then clicked Save. Make Tor
  22768. automatically convert "HashedControlPassword" to this new option but
  22769. only when it's given on the command line. Partial fix for bug 586.
  22770. - Patch from "Andrew S. Lists" to catch when we contact a directory
  22771. mirror at IP address X and he says we look like we're coming from
  22772. IP address X. Otherwise this would screw up our address detection.
  22773. - Reject uploaded descriptors and extrainfo documents if they're
  22774. huge. Otherwise we'll cache them all over the network and it'll
  22775. clog everything up. Suggested by Aljosha Judmayer.
  22776. - When a hidden service was trying to establish an introduction point,
  22777. and Tor *did* manage to reuse one of the preemptively built
  22778. circuits, it didn't correctly remember which one it used,
  22779. so it asked for another one soon after, until there were no
  22780. more preemptive circuits, at which point it launched one from
  22781. scratch. Bugfix on 0.0.9.x.
  22782. o Rate limiting and load balancing improvements:
  22783. - When we add data to a write buffer in response to the data on that
  22784. write buffer getting low because of a flush, do not consider the
  22785. newly added data as a candidate for immediate flushing, but rather
  22786. make it wait until the next round of writing. Otherwise, we flush
  22787. and refill recursively, and a single greedy TLS connection can
  22788. eat all of our bandwidth.
  22789. - When counting the number of bytes written on a TLS connection,
  22790. look at the BIO actually used for writing to the network, not
  22791. at the BIO used (sometimes) to buffer data for the network.
  22792. Looking at different BIOs could result in write counts on the
  22793. order of ULONG_MAX. Fixes bug 614.
  22794. - If we change our MaxAdvertisedBandwidth and then reload torrc,
  22795. Tor won't realize it should publish a new relay descriptor. Fixes
  22796. bug 688, reported by mfr.
  22797. - Avoid using too little bandwidth when our clock skips a few seconds.
  22798. - Choose which bridge to use proportional to its advertised bandwidth,
  22799. rather than uniformly at random. This should speed up Tor for
  22800. bridge users. Also do this for people who set StrictEntryNodes.
  22801. o Bootstrapping faster and building circuits more intelligently:
  22802. - Fix bug 660 that was preventing us from knowing that we should
  22803. preemptively build circuits to handle expected directory requests.
  22804. - When we're checking if we have enough dir info for each relay
  22805. to begin establishing circuits, make sure that we actually have
  22806. the descriptor listed in the consensus, not just any descriptor.
  22807. - Correctly notify one-hop connections when a circuit build has
  22808. failed. Possible fix for bug 669. Found by lodger.
  22809. - Clients now hold circuitless TLS connections open for 1.5 times
  22810. MaxCircuitDirtiness (15 minutes), since it is likely that they'll
  22811. rebuild a new circuit over them within that timeframe. Previously,
  22812. they held them open only for KeepalivePeriod (5 minutes).
  22813. o Performance improvements (memory):
  22814. - Add OpenBSD malloc code from "phk" as an optional malloc
  22815. replacement on Linux: some glibc libraries do very poorly with
  22816. Tor's memory allocation patterns. Pass --enable-openbsd-malloc to
  22817. ./configure to get the replacement malloc code.
  22818. - Switch our old ring buffer implementation for one more like that
  22819. used by free Unix kernels. The wasted space in a buffer with 1mb
  22820. of data will now be more like 8k than 1mb. The new implementation
  22821. also avoids realloc();realloc(); patterns that can contribute to
  22822. memory fragmentation.
  22823. - Change the way that Tor buffers data that it is waiting to write.
  22824. Instead of queueing data cells in an enormous ring buffer for each
  22825. client->OR or OR->OR connection, we now queue cells on a separate
  22826. queue for each circuit. This lets us use less slack memory, and
  22827. will eventually let us be smarter about prioritizing different kinds
  22828. of traffic.
  22829. - Reference-count and share copies of address policy entries; only 5%
  22830. of them were actually distinct.
  22831. - Tune parameters for cell pool allocation to minimize amount of
  22832. RAM overhead used.
  22833. - Keep unused 4k and 16k buffers on free lists, rather than wasting 8k
  22834. for every single inactive connection_t. Free items from the
  22835. 4k/16k-buffer free lists when they haven't been used for a while.
  22836. - Make memory debugging information describe more about history
  22837. of cell allocation, so we can help reduce our memory use.
  22838. - Be even more aggressive about releasing RAM from small
  22839. empty buffers. Thanks to our free-list code, this shouldn't be too
  22840. performance-intensive.
  22841. - Log malloc statistics from mallinfo() on platforms where it exists.
  22842. - Use memory pools to allocate cells with better speed and memory
  22843. efficiency, especially on platforms where malloc() is inefficient.
  22844. - Add a --with-tcmalloc option to the configure script to link
  22845. against tcmalloc (if present). Does not yet search for non-system
  22846. include paths.
  22847. o Performance improvements (socket management):
  22848. - Count the number of open sockets separately from the number of
  22849. active connection_t objects. This will let us avoid underusing
  22850. our allocated connection limit.
  22851. - We no longer use socket pairs to link an edge connection to an
  22852. anonymous directory connection or a DirPort test connection.
  22853. Instead, we track the link internally and transfer the data
  22854. in-process. This saves two sockets per "linked" connection (at the
  22855. client and at the server), and avoids the nasty Windows socketpair()
  22856. workaround.
  22857. - We were leaking a file descriptor if Tor started with a zero-length
  22858. cached-descriptors file. Patch by "freddy77".
  22859. o Performance improvements (CPU use):
  22860. - Never walk through the list of logs if we know that no log target
  22861. is interested in a given message.
  22862. - Call routerlist_remove_old_routers() much less often. This should
  22863. speed startup, especially on directory caches.
  22864. - Base64 decoding was actually showing up on our profile when parsing
  22865. the initial descriptor file; switch to an in-process all-at-once
  22866. implementation that's about 3.5x times faster than calling out to
  22867. OpenSSL.
  22868. - Use a slightly simpler string hashing algorithm (copying Python's
  22869. instead of Java's) and optimize our digest hashing algorithm to take
  22870. advantage of 64-bit platforms and to remove some possibly-costly
  22871. voodoo.
  22872. - When implementing AES counter mode, update only the portions of the
  22873. counter buffer that need to change, and don't keep separate
  22874. network-order and host-order counters on big-endian hosts (where
  22875. they are the same).
  22876. - Add an in-place version of aes_crypt() so that we can avoid doing a
  22877. needless memcpy() call on each cell payload.
  22878. - Use Critical Sections rather than Mutexes for synchronizing threads
  22879. on win32; Mutexes are heavier-weight, and designed for synchronizing
  22880. between processes.
  22881. o Performance improvements (bandwidth use):
  22882. - Don't try to launch new descriptor downloads quite so often when we
  22883. already have enough directory information to build circuits.
  22884. - Version 1 directories are no longer generated in full. Instead,
  22885. authorities generate and serve "stub" v1 directories that list
  22886. no servers. This will stop Tor versions 0.1.0.x and earlier from
  22887. working, but (for security reasons) nobody should be running those
  22888. versions anyway.
  22889. - Avoid going directly to the directory authorities even if you're a
  22890. relay, if you haven't found yourself reachable yet or if you've
  22891. decided not to advertise your dirport yet. Addresses bug 556.
  22892. - If we've gone 12 hours since our last bandwidth check, and we
  22893. estimate we have less than 50KB bandwidth capacity but we could
  22894. handle more, do another bandwidth test.
  22895. - Support "If-Modified-Since" when answering HTTP requests for
  22896. directories, running-routers documents, and v2 and v3 networkstatus
  22897. documents. (There's no need to support it for router descriptors,
  22898. since those are downloaded by descriptor digest.)
  22899. - Stop fetching directory info so aggressively if your DirPort is
  22900. on but your ORPort is off; stop fetching v2 dir info entirely.
  22901. You can override these choices with the new FetchDirInfoEarly
  22902. config option.
  22903. o Changed config option behavior (features):
  22904. - Configuration files now accept C-style strings as values. This
  22905. helps encode characters not allowed in the current configuration
  22906. file format, such as newline or #. Addresses bug 557.
  22907. - Add hidden services and DNSPorts to the list of things that make
  22908. Tor accept that it has running ports. Change starting Tor with no
  22909. ports from a fatal error to a warning; we might change it back if
  22910. this turns out to confuse anybody. Fixes bug 579.
  22911. - Make PublishServerDescriptor default to 1, so the default doesn't
  22912. have to change as we invent new directory protocol versions.
  22913. - Allow people to say PreferTunnelledDirConns rather than
  22914. PreferTunneledDirConns, for those alternate-spellers out there.
  22915. - Raise the default BandwidthRate/BandwidthBurst to 5MB/10MB, to
  22916. accommodate the growing number of servers that use the default
  22917. and are reaching it.
  22918. - Make it possible to enable HashedControlPassword and
  22919. CookieAuthentication at the same time.
  22920. - When a TrackHostExits-chosen exit fails too many times in a row,
  22921. stop using it. Fixes bug 437.
  22922. o Changed config option behavior (bugfixes):
  22923. - Do not read the configuration file when we've only been told to
  22924. generate a password hash. Fixes bug 643. Bugfix on 0.0.9pre5. Fix
  22925. based on patch from Sebastian Hahn.
  22926. - Actually validate the options passed to AuthDirReject,
  22927. AuthDirInvalid, AuthDirBadDir, and AuthDirBadExit.
  22928. - Make "ClientOnly 1" config option disable directory ports too.
  22929. - Don't stop fetching descriptors when FetchUselessDescriptors is
  22930. set, even if we stop asking for circuits. Bug reported by tup
  22931. and ioerror.
  22932. - Servers used to decline to publish their DirPort if their
  22933. BandwidthRate or MaxAdvertisedBandwidth were below a threshold. Now
  22934. they look only at BandwidthRate and RelayBandwidthRate.
  22935. - Treat "2gb" when given in torrc for a bandwidth as meaning 2gb,
  22936. minus 1 byte: the actual maximum declared bandwidth.
  22937. - Make "TrackHostExits ." actually work. Bugfix on 0.1.0.x.
  22938. - Make the NodeFamilies config option work. (Reported by
  22939. lodger -- it has never actually worked, even though we added it
  22940. in Oct 2004.)
  22941. - If Tor is invoked from something that isn't a shell (e.g. Vidalia),
  22942. now we expand "-f ~/.tor/torrc" correctly. Suggested by Matt Edman.
  22943. o New config options:
  22944. - New configuration options AuthDirMaxServersPerAddr and
  22945. AuthDirMaxServersperAuthAddr to override default maximum number
  22946. of servers allowed on a single IP address. This is important for
  22947. running a test network on a single host.
  22948. - Three new config options (AlternateDirAuthority,
  22949. AlternateBridgeAuthority, and AlternateHSAuthority) that let the
  22950. user selectively replace the default directory authorities by type,
  22951. rather than the all-or-nothing replacement that DirServer offers.
  22952. - New config options AuthDirBadDir and AuthDirListBadDirs for
  22953. authorities to mark certain relays as "bad directories" in the
  22954. networkstatus documents. Also supports the "!baddir" directive in
  22955. the approved-routers file.
  22956. - New config option V2AuthoritativeDirectory that all v2 directory
  22957. authorities must set. This lets v3 authorities choose not to serve
  22958. v2 directory information.
  22959. o Minor features (other):
  22960. - When we're not serving v2 directory information, there is no reason
  22961. to actually keep any around. Remove the obsolete files and directory
  22962. on startup if they are very old and we aren't going to serve them.
  22963. - When we negotiate a v2 link-layer connection (not yet implemented),
  22964. accept RELAY_EARLY cells and turn them into RELAY cells if we've
  22965. negotiated a v1 connection for their next step. Initial steps for
  22966. proposal 110.
  22967. - When we have no consensus, check FallbackNetworkstatusFile (defaults
  22968. to $PREFIX/share/tor/fallback-consensus) for a consensus. This way
  22969. we can start out knowing some directory caches. We don't ship with
  22970. a fallback consensus by default though, because it was making
  22971. bootstrapping take too long while we tried many down relays.
  22972. - Authorities send back an X-Descriptor-Not-New header in response to
  22973. an accepted-but-discarded descriptor upload. Partially implements
  22974. fix for bug 535.
  22975. - If we find a cached-routers file that's been sitting around for more
  22976. than 28 days unmodified, then most likely it's a leftover from
  22977. when we upgraded to 0.2.0.8-alpha. Remove it. It has no good
  22978. routers anyway.
  22979. - When we (as a cache) download a descriptor because it was listed
  22980. in a consensus, remember when the consensus was supposed to expire,
  22981. and don't expire the descriptor until then.
  22982. - Optionally (if built with -DEXPORTMALLINFO) export the output
  22983. of mallinfo via http, as tor/mallinfo.txt. Only accessible
  22984. from localhost.
  22985. - Tag every guard node in our state file with the version that
  22986. we believe added it, or with our own version if we add it. This way,
  22987. if a user temporarily runs an old version of Tor and then switches
  22988. back to a new one, she doesn't automatically lose her guards.
  22989. - When somebody requests a list of statuses or servers, and we have
  22990. none of those, return a 404 rather than an empty 200.
  22991. - Merge in some (as-yet-unused) IPv6 address manipulation code. (Patch
  22992. from croup.)
  22993. - Add an HSAuthorityRecordStats option that hidden service authorities
  22994. can use to track statistics of overall hidden service usage without
  22995. logging information that would be as useful to an attacker.
  22996. - Allow multiple HiddenServicePort directives with the same virtual
  22997. port; when they occur, the user is sent round-robin to one
  22998. of the target ports chosen at random. Partially fixes bug 393 by
  22999. adding limited ad-hoc round-robining.
  23000. - Revamp file-writing logic so we don't need to have the entire
  23001. contents of a file in memory at once before we write to disk. Tor,
  23002. meet stdio.
  23003. o Minor bugfixes (other):
  23004. - Alter the code that tries to recover from unhandled write
  23005. errors, to not try to flush onto a socket that's given us
  23006. unhandled errors.
  23007. - Directory mirrors no longer include a guess at the client's IP
  23008. address if the connection appears to be coming from the same /24
  23009. network; it was producing too many wrong guesses.
  23010. - If we're trying to flush the last bytes on a connection (for
  23011. example, when answering a directory request), reset the
  23012. time-to-give-up timeout every time we manage to write something
  23013. on the socket.
  23014. - Reject router descriptors with out-of-range bandwidthcapacity or
  23015. bandwidthburst values.
  23016. - If we can't expand our list of entry guards (e.g. because we're
  23017. using bridges or we have StrictEntryNodes set), don't mark relays
  23018. down when they fail a directory request. Otherwise we're too quick
  23019. to mark all our entry points down.
  23020. - Authorities no longer send back "400 you're unreachable please fix
  23021. it" errors to Tor servers that aren't online all the time. We're
  23022. supposed to tolerate these servers now.
  23023. - Let directory authorities startup even when they can't generate
  23024. a descriptor immediately, e.g. because they don't know their
  23025. address.
  23026. - Correctly enforce that elements of directory objects do not appear
  23027. more often than they are allowed to appear.
  23028. - Stop allowing hibernating servers to be "stable" or "fast".
  23029. - On Windows, we were preventing other processes from reading
  23030. cached-routers while Tor was running. (Reported by janbar)
  23031. - Check return values from pthread_mutex functions.
  23032. - When opening /dev/null in finish_daemonize(), do not pass the
  23033. O_CREAT flag. Fortify was complaining, and correctly so. Fixes
  23034. bug 742; fix from Michael Scherer. Bugfix on 0.0.2pre19.
  23035. o Controller features:
  23036. - The GETCONF command now escapes and quotes configuration values
  23037. that don't otherwise fit into the torrc file.
  23038. - The SETCONF command now handles quoted values correctly.
  23039. - Add "GETINFO/desc-annotations/id/<OR digest>" so controllers can
  23040. ask about source, timestamp of arrival, purpose, etc. We need
  23041. something like this to help Vidalia not do GeoIP lookups on bridge
  23042. addresses.
  23043. - Allow multiple HashedControlPassword config lines, to support
  23044. multiple controller passwords.
  23045. - Accept LF instead of CRLF on controller, since some software has a
  23046. hard time generating real Internet newlines.
  23047. - Add GETINFO values for the server status events
  23048. "REACHABILITY_SUCCEEDED" and "GOOD_SERVER_DESCRIPTOR". Patch from
  23049. Robert Hogan.
  23050. - There is now an ugly, temporary "desc/all-recent-extrainfo-hack"
  23051. GETINFO for Torstat to use until it can switch to using extrainfos.
  23052. - New config option CookieAuthFile to choose a new location for the
  23053. cookie authentication file, and config option
  23054. CookieAuthFileGroupReadable to make it group-readable.
  23055. - Add a SOURCE_ADDR field to STREAM NEW events so that controllers can
  23056. match requests to applications. Patch from Robert Hogan.
  23057. - Add a RESOLVE command to launch hostname lookups. Original patch
  23058. from Robert Hogan.
  23059. - Add GETINFO status/enough-dir-info to let controllers tell whether
  23060. Tor has downloaded sufficient directory information. Patch from Tup.
  23061. - You can now use the ControlSocket option to tell Tor to listen for
  23062. controller connections on Unix domain sockets on systems that
  23063. support them. Patch from Peter Palfrader.
  23064. - New "GETINFO address-mappings/*" command to get address mappings
  23065. with expiry information. "addr-mappings/*" is now deprecated.
  23066. Patch from Tup.
  23067. - Add a new config option __DisablePredictedCircuits designed for
  23068. use by the controller, when we don't want Tor to build any circuits
  23069. preemptively.
  23070. - Let the controller specify HOP=%d as an argument to ATTACHSTREAM,
  23071. so we can exit from the middle of the circuit.
  23072. - Implement "getinfo status/circuit-established".
  23073. - Implement "getinfo status/version/..." so a controller can tell
  23074. whether the current version is recommended, and whether any versions
  23075. are good, and how many authorities agree. Patch from "shibz".
  23076. - Controllers should now specify cache=no or cache=yes when using
  23077. the +POSTDESCRIPTOR command.
  23078. - Add a "PURPOSE=" argument to "STREAM NEW" events, as suggested by
  23079. Robert Hogan. Fixes the first part of bug 681.
  23080. - When reporting clock skew, and we know that the clock is _at least
  23081. as skewed_ as some value, but we don't know the actual value,
  23082. report the value as a "minimum skew."
  23083. o Controller bugfixes:
  23084. - Generate "STATUS_SERVER" events rather than misspelled
  23085. "STATUS_SEVER" events. Caught by mwenge.
  23086. - Reject controller commands over 1MB in length, so rogue
  23087. processes can't run us out of memory.
  23088. - Change the behavior of "getinfo status/good-server-descriptor"
  23089. so it doesn't return failure when any authority disappears.
  23090. - Send NAMESERVER_STATUS messages for a single failed nameserver
  23091. correctly.
  23092. - When the DANGEROUS_VERSION controller status event told us we're
  23093. running an obsolete version, it used the string "OLD" to describe
  23094. it. Yet the "getinfo" interface used the string "OBSOLETE". Now use
  23095. "OBSOLETE" in both cases.
  23096. - Respond to INT and TERM SIGNAL commands before we execute the
  23097. signal, in case the signal shuts us down. We had a patch in
  23098. 0.1.2.1-alpha that tried to do this by queueing the response on
  23099. the connection's buffer before shutting down, but that really
  23100. isn't the same thing at all. Bug located by Matt Edman.
  23101. - Provide DNS expiry times in GMT, not in local time. For backward
  23102. compatibility, ADDRMAP events only provide GMT expiry in an extended
  23103. field. "GETINFO address-mappings" always does the right thing.
  23104. - Use CRLF line endings properly in NS events.
  23105. - Make 'getinfo fingerprint' return a 551 error if we're not a
  23106. server, so we match what the control spec claims we do. Reported
  23107. by daejees.
  23108. - Fix a typo in an error message when extendcircuit fails that
  23109. caused us to not follow the \r\n-based delimiter protocol. Reported
  23110. by daejees.
  23111. - When tunneling an encrypted directory connection, and its first
  23112. circuit fails, do not leave it unattached and ask the controller
  23113. to deal. Fixes the second part of bug 681.
  23114. - Treat some 403 responses from directory servers as INFO rather than
  23115. WARN-severity events.
  23116. o Portability / building / compiling:
  23117. - When building with --enable-gcc-warnings, check for whether Apple's
  23118. warning "-Wshorten-64-to-32" is available.
  23119. - Support compilation to target iPhone; patch from cjacker huang.
  23120. To build for iPhone, pass the --enable-iphone option to configure.
  23121. - Port Tor to build and run correctly on Windows CE systems, using
  23122. the wcecompat library. Contributed by Valerio Lupi.
  23123. - Detect non-ASCII platforms (if any still exist) and refuse to
  23124. build there: some of our code assumes that 'A' is 65 and so on.
  23125. - Clear up some MIPSPro compiler warnings.
  23126. - Make autoconf search for libevent, openssl, and zlib consistently.
  23127. - Update deprecated macros in configure.in.
  23128. - When warning about missing headers, tell the user to let us
  23129. know if the compile succeeds anyway, so we can downgrade the
  23130. warning.
  23131. - Include the current subversion revision as part of the version
  23132. string: either fetch it directly if we're in an SVN checkout, do
  23133. some magic to guess it if we're in an SVK checkout, or use
  23134. the last-detected version if we're building from a .tar.gz.
  23135. Use this version consistently in log messages.
  23136. - Correctly report platform name on Windows 95 OSR2 and Windows 98 SE.
  23137. - Read resolv.conf files correctly on platforms where read() returns
  23138. partial results on small file reads.
  23139. - Build without verbose warnings even on gcc 4.2 and 4.3.
  23140. - On Windows, correctly detect errors when listing the contents of
  23141. a directory. Fix from lodger.
  23142. - Run 'make test' as part of 'make dist', so we stop releasing so
  23143. many development snapshots that fail their unit tests.
  23144. - Add support to detect Libevent versions in the 1.4.x series
  23145. on mingw.
  23146. - Add command-line arguments to unit-test executable so that we can
  23147. invoke any chosen test from the command line rather than having
  23148. to run the whole test suite at once; and so that we can turn on
  23149. logging for the unit tests.
  23150. - Do not automatically run configure from autogen.sh. This
  23151. non-standard behavior tended to annoy people who have built other
  23152. programs.
  23153. - Fix a macro/CPP interaction that was confusing some compilers:
  23154. some GCCs don't like #if/#endif pairs inside macro arguments.
  23155. Fixes bug 707.
  23156. - Fix macro collision between OpenSSL 0.9.8h and Windows headers.
  23157. Fixes bug 704; fix from Steven Murdoch.
  23158. - Correctly detect transparent proxy support on Linux hosts that
  23159. require in.h to be included before netfilter_ipv4.h. Patch
  23160. from coderman.
  23161. o Logging improvements:
  23162. - When we haven't had any application requests lately, don't bother
  23163. logging that we have expired a bunch of descriptors.
  23164. - When attempting to open a logfile fails, tell us why.
  23165. - Only log guard node status when guard node status has changed.
  23166. - Downgrade the 3 most common "INFO" messages to "DEBUG". This will
  23167. make "INFO" 75% less verbose.
  23168. - When SafeLogging is disabled, log addresses along with all TLS
  23169. errors.
  23170. - Report TLS "zero return" case as a "clean close" and "IO error"
  23171. as a "close". Stop calling closes "unexpected closes": existing
  23172. Tors don't use SSL_close(), so having a connection close without
  23173. the TLS shutdown handshake is hardly unexpected.
  23174. - When we receive a consensus from the future, warn about skew.
  23175. - Make "not enough dir info yet" warnings describe *why* Tor feels
  23176. it doesn't have enough directory info yet.
  23177. - On the USR1 signal, when dmalloc is in use, log the top 10 memory
  23178. consumers. (We already do this on HUP.)
  23179. - Give more descriptive well-formedness errors for out-of-range
  23180. hidden service descriptor/protocol versions.
  23181. - Stop recommending that every server operator send mail to tor-ops.
  23182. Resolves bug 597. Bugfix on 0.1.2.x.
  23183. - Improve skew reporting: try to give the user a better log message
  23184. about how skewed they are, and how much this matters.
  23185. - New --quiet command-line option to suppress the default console log.
  23186. Good in combination with --hash-password.
  23187. - Don't complain that "your server has not managed to confirm that its
  23188. ports are reachable" if we haven't been able to build any circuits
  23189. yet.
  23190. - Detect the reason for failing to mmap a descriptor file we just
  23191. wrote, and give a more useful log message. Fixes bug 533.
  23192. - Always prepend "Bug: " to any log message about a bug.
  23193. - When dumping memory usage, list bytes used in buffer memory
  23194. free-lists.
  23195. - When running with dmalloc, dump more stats on hup and on exit.
  23196. - Put a platform string (e.g. "Linux i686") in the startup log
  23197. message, so when people paste just their logs, we know if it's
  23198. OpenBSD or Windows or what.
  23199. - When logging memory usage, break down memory used in buffers by
  23200. buffer type.
  23201. - When we are reporting the DirServer line we just parsed, we were
  23202. logging the second stanza of the key fingerprint, not the first.
  23203. - Even though Windows is equally happy with / and \ as path separators,
  23204. try to use \ consistently on Windows and / consistently on Unix: it
  23205. makes the log messages nicer.
  23206. - On OSX, stop warning the user that kqueue support in libevent is
  23207. "experimental", since it seems to have worked fine for ages.
  23208. o Contributed scripts and tools:
  23209. - Update linux-tor-prio.sh script to allow QoS based on the uid of
  23210. the Tor process. Patch from Marco Bonetti with tweaks from Mike
  23211. Perry.
  23212. - Include the "tor-ctrl.sh" bash script by Stefan Behte to provide
  23213. Unix users an easy way to script their Tor process (e.g. by
  23214. adjusting bandwidth based on the time of the day).
  23215. - In the exitlist script, only consider the most recently published
  23216. server descriptor for each server. Also, when the user requests
  23217. a list of servers that _reject_ connections to a given address,
  23218. explicitly exclude the IPs that also have servers that accept
  23219. connections to that address. Resolves bug 405.
  23220. - Include a new contrib/tor-exit-notice.html file that exit relay
  23221. operators can put on their website to help reduce abuse queries.
  23222. o Newly deprecated features:
  23223. - The status/version/num-versioning and status/version/num-concurring
  23224. GETINFO controller options are no longer useful in the v3 directory
  23225. protocol: treat them as deprecated, and warn when they're used.
  23226. - The RedirectExits config option is now deprecated.
  23227. o Removed features:
  23228. - Drop the old code to choke directory connections when the
  23229. corresponding OR connections got full: thanks to the cell queue
  23230. feature, OR conns don't get full any more.
  23231. - Remove the old "dns worker" server DNS code: it hasn't been default
  23232. since 0.1.2.2-alpha, and all the servers are using the new
  23233. eventdns code.
  23234. - Remove the code to generate the oldest (v1) directory format.
  23235. - Remove support for the old bw_accounting file: we've been storing
  23236. bandwidth accounting information in the state file since
  23237. 0.1.2.5-alpha. This may result in bandwidth accounting errors
  23238. if you try to upgrade from 0.1.1.x or earlier, or if you try to
  23239. downgrade to 0.1.1.x or earlier.
  23240. - Drop support for OpenSSL version 0.9.6. Just about nobody was using
  23241. it, it had no AES, and it hasn't seen any security patches since
  23242. 2004.
  23243. - Stop overloading the circuit_t.onionskin field for both "onionskin
  23244. from a CREATE cell that we are waiting for a cpuworker to be
  23245. assigned" and "onionskin from an EXTEND cell that we are going to
  23246. send to an OR as soon as we are connected". Might help with bug 600.
  23247. - Remove the tor_strpartition() function: its logic was confused,
  23248. and it was only used for one thing that could be implemented far
  23249. more easily.
  23250. - Remove the contrib scripts ExerciseServer.py, PathDemo.py,
  23251. and TorControl.py, as they use the old v0 controller protocol,
  23252. and are obsoleted by TorFlow anyway.
  23253. - Drop support for v1 rendezvous descriptors, since we never used
  23254. them anyway, and the code has probably rotted by now. Based on
  23255. patch from Karsten Loesing.
  23256. - Stop allowing address masks that do not correspond to bit prefixes.
  23257. We have warned about these for a really long time; now it's time
  23258. to reject them. (Patch from croup.)
  23259. - Remove an optimization in the AES counter-mode code that assumed
  23260. that the counter never exceeded 2^68. When the counter can be set
  23261. arbitrarily as an IV (as it is by Karsten's new hidden services
  23262. code), this assumption no longer holds.
  23263. - Disable the SETROUTERPURPOSE controller command: it is now
  23264. obsolete.
  23265. Changes in version 0.1.2.19 - 2008-01-17
  23266. Tor 0.1.2.19 fixes a huge memory leak on exit relays, makes the default
  23267. exit policy a little bit more conservative so it's safer to run an
  23268. exit relay on a home system, and fixes a variety of smaller issues.
  23269. o Security fixes:
  23270. - Exit policies now reject connections that are addressed to a
  23271. relay's public (external) IP address too, unless
  23272. ExitPolicyRejectPrivate is turned off. We do this because too
  23273. many relays are running nearby to services that trust them based
  23274. on network address.
  23275. o Major bugfixes:
  23276. - When the clock jumps forward a lot, do not allow the bandwidth
  23277. buckets to become negative. Fixes bug 544.
  23278. - Fix a memory leak on exit relays; we were leaking a cached_resolve_t
  23279. on every successful resolve. Reported by Mike Perry.
  23280. - Purge old entries from the "rephist" database and the hidden
  23281. service descriptor database even when DirPort is zero.
  23282. - Stop thinking that 0.1.2.x directory servers can handle "begin_dir"
  23283. requests. Should ease bugs 406 and 419 where 0.1.2.x relays are
  23284. crashing or mis-answering these requests.
  23285. - When we decide to send a 503 response to a request for servers, do
  23286. not then also send the server descriptors: this defeats the whole
  23287. purpose. Fixes bug 539.
  23288. o Minor bugfixes:
  23289. - Changing the ExitPolicyRejectPrivate setting should cause us to
  23290. rebuild our server descriptor.
  23291. - Fix handling of hex nicknames when answering controller requests for
  23292. networkstatus by name, or when deciding whether to warn about
  23293. unknown routers in a config option. (Patch from mwenge.)
  23294. - Fix a couple of hard-to-trigger autoconf problems that could result
  23295. in really weird results on platforms whose sys/types.h files define
  23296. nonstandard integer types.
  23297. - Don't try to create the datadir when running --verify-config or
  23298. --hash-password. Resolves bug 540.
  23299. - If we were having problems getting a particular descriptor from the
  23300. directory caches, and then we learned about a new descriptor for
  23301. that router, we weren't resetting our failure count. Reported
  23302. by lodger.
  23303. - Although we fixed bug 539 (where servers would send HTTP status 503
  23304. responses _and_ send a body too), there are still servers out there
  23305. that haven't upgraded. Therefore, make clients parse such bodies
  23306. when they receive them.
  23307. - Run correctly on systems where rlim_t is larger than unsigned long.
  23308. This includes some 64-bit systems.
  23309. - Run correctly on platforms (like some versions of OS X 10.5) where
  23310. the real limit for number of open files is OPEN_FILES, not rlim_max
  23311. from getrlimit(RLIMIT_NOFILES).
  23312. - Avoid a spurious free on base64 failure.
  23313. - Avoid segfaults on certain complex invocations of
  23314. router_get_by_hexdigest().
  23315. - Fix rare bug on REDIRECTSTREAM control command when called with no
  23316. port set: it could erroneously report an error when none had
  23317. happened.
  23318. Changes in version 0.1.2.18 - 2007-10-28
  23319. Tor 0.1.2.18 fixes many problems including crash bugs, problems with
  23320. hidden service introduction that were causing huge delays, and a big
  23321. bug that was causing some servers to disappear from the network status
  23322. lists for a few hours each day.
  23323. o Major bugfixes (crashes):
  23324. - If a connection is shut down abruptly because of something that
  23325. happened inside connection_flushed_some(), do not call
  23326. connection_finished_flushing(). Should fix bug 451:
  23327. "connection_stop_writing: Assertion conn->write_event failed"
  23328. Bugfix on 0.1.2.7-alpha.
  23329. - Fix possible segfaults in functions called from
  23330. rend_process_relay_cell().
  23331. o Major bugfixes (hidden services):
  23332. - Hidden services were choosing introduction points uniquely by
  23333. hexdigest, but when constructing the hidden service descriptor
  23334. they merely wrote the (potentially ambiguous) nickname.
  23335. - Clients now use the v2 intro format for hidden service
  23336. connections: they specify their chosen rendezvous point by identity
  23337. digest rather than by (potentially ambiguous) nickname. These
  23338. changes could speed up hidden service connections dramatically.
  23339. o Major bugfixes (other):
  23340. - Stop publishing a new server descriptor just because we get a
  23341. HUP signal. This led (in a roundabout way) to some servers getting
  23342. dropped from the networkstatus lists for a few hours each day.
  23343. - When looking for a circuit to cannibalize, consider family as well
  23344. as identity. Fixes bug 438. Bugfix on 0.1.0.x (which introduced
  23345. circuit cannibalization).
  23346. - When a router wasn't listed in a new networkstatus, we were leaving
  23347. the flags for that router alone -- meaning it remained Named,
  23348. Running, etc -- even though absence from the networkstatus means
  23349. that it shouldn't be considered to exist at all anymore. Now we
  23350. clear all the flags for routers that fall out of the networkstatus
  23351. consensus. Fixes bug 529.
  23352. o Minor bugfixes:
  23353. - Don't try to access (or alter) the state file when running
  23354. --list-fingerprint or --verify-config or --hash-password. Resolves
  23355. bug 499.
  23356. - When generating information telling us how to extend to a given
  23357. router, do not try to include the nickname if it is
  23358. absent. Resolves bug 467.
  23359. - Fix a user-triggerable segfault in expand_filename(). (There isn't
  23360. a way to trigger this remotely.)
  23361. - When sending a status event to the controller telling it that an
  23362. OR address is reachable, set the port correctly. (Previously we
  23363. were reporting the dir port.)
  23364. - Fix a minor memory leak whenever a controller sends the PROTOCOLINFO
  23365. command. Bugfix on 0.1.2.17.
  23366. - When loading bandwidth history, do not believe any information in
  23367. the future. Fixes bug 434.
  23368. - When loading entry guard information, do not believe any information
  23369. in the future.
  23370. - When we have our clock set far in the future and generate an
  23371. onion key, then re-set our clock to be correct, we should not stop
  23372. the onion key from getting rotated.
  23373. - On some platforms, accept() can return a broken address. Detect
  23374. this more quietly, and deal accordingly. Fixes bug 483.
  23375. - It's not actually an error to find a non-pending entry in the DNS
  23376. cache when canceling a pending resolve. Don't log unless stuff
  23377. is fishy. Resolves bug 463.
  23378. - Don't reset trusted dir server list when we set a configuration
  23379. option. Patch from Robert Hogan.
  23380. Changes in version 0.1.2.17 - 2007-08-30
  23381. Tor 0.1.2.17 features a new Vidalia version in the Windows and OS
  23382. X bundles. Vidalia 0.0.14 makes authentication required for the
  23383. ControlPort in the default configuration, which addresses important
  23384. security risks. Everybody who uses Vidalia (or another controller)
  23385. should upgrade.
  23386. In addition, this Tor update fixes major load balancing problems with
  23387. path selection, which should speed things up a lot once many people
  23388. have upgraded.
  23389. o Major bugfixes (security):
  23390. - We removed support for the old (v0) control protocol. It has been
  23391. deprecated since Tor 0.1.1.1-alpha, and keeping it secure has
  23392. become more of a headache than it's worth.
  23393. o Major bugfixes (load balancing):
  23394. - When choosing nodes for non-guard positions, weight guards
  23395. proportionally less, since they already have enough load. Patch
  23396. from Mike Perry.
  23397. - Raise the "max believable bandwidth" from 1.5MB/s to 10MB/s. This
  23398. will allow fast Tor servers to get more attention.
  23399. - When we're upgrading from an old Tor version, forget our current
  23400. guards and pick new ones according to the new weightings. These
  23401. three load balancing patches could raise effective network capacity
  23402. by a factor of four. Thanks to Mike Perry for measurements.
  23403. o Major bugfixes (stream expiration):
  23404. - Expire not-yet-successful application streams in all cases if
  23405. they've been around longer than SocksTimeout. Right now there are
  23406. some cases where the stream will live forever, demanding a new
  23407. circuit every 15 seconds. Fixes bug 454; reported by lodger.
  23408. o Minor features (controller):
  23409. - Add a PROTOCOLINFO controller command. Like AUTHENTICATE, it
  23410. is valid before any authentication has been received. It tells
  23411. a controller what kind of authentication is expected, and what
  23412. protocol is spoken. Implements proposal 119.
  23413. o Minor bugfixes (performance):
  23414. - Save on most routerlist_assert_ok() calls in routerlist.c, thus
  23415. greatly speeding up loading cached-routers from disk on startup.
  23416. - Disable sentinel-based debugging for buffer code: we squashed all
  23417. the bugs that this was supposed to detect a long time ago, and now
  23418. its only effect is to change our buffer sizes from nice powers of
  23419. two (which platform mallocs tend to like) to values slightly over
  23420. powers of two (which make some platform mallocs sad).
  23421. o Minor bugfixes (misc):
  23422. - If exit bandwidth ever exceeds one third of total bandwidth, then
  23423. use the correct formula to weight exit nodes when choosing paths.
  23424. Based on patch from Mike Perry.
  23425. - Choose perfectly fairly among routers when choosing by bandwidth and
  23426. weighting by fraction of bandwidth provided by exits. Previously, we
  23427. would choose with only approximate fairness, and correct ourselves
  23428. if we ran off the end of the list.
  23429. - If we require CookieAuthentication but we fail to write the
  23430. cookie file, we would warn but not exit, and end up in a state
  23431. where no controller could authenticate. Now we exit.
  23432. - If we require CookieAuthentication, stop generating a new cookie
  23433. every time we change any piece of our config.
  23434. - Refuse to start with certain directory authority keys, and
  23435. encourage people using them to stop.
  23436. - Terminate multi-line control events properly. Original patch
  23437. from tup.
  23438. - Fix a minor memory leak when we fail to find enough suitable
  23439. servers to choose a circuit.
  23440. - Stop leaking part of the descriptor when we run into a particularly
  23441. unparseable piece of it.
  23442. Changes in version 0.1.2.16 - 2007-08-01
  23443. Tor 0.1.2.16 fixes a critical security vulnerability that allows a
  23444. remote attacker in certain situations to rewrite the user's torrc
  23445. configuration file. This can completely compromise anonymity of users
  23446. in most configurations, including those running the Vidalia bundles,
  23447. TorK, etc. Or worse.
  23448. o Major security fixes:
  23449. - Close immediately after missing authentication on control port;
  23450. do not allow multiple authentication attempts.
  23451. Changes in version 0.1.2.15 - 2007-07-17
  23452. Tor 0.1.2.15 fixes several crash bugs, fixes some anonymity-related
  23453. problems, fixes compilation on BSD, and fixes a variety of other
  23454. bugs. Everybody should upgrade.
  23455. o Major bugfixes (compilation):
  23456. - Fix compile on FreeBSD/NetBSD/OpenBSD. Oops.
  23457. o Major bugfixes (crashes):
  23458. - Try even harder not to dereference the first character after
  23459. an mmap(). Reported by lodger.
  23460. - Fix a crash bug in directory authorities when we re-number the
  23461. routerlist while inserting a new router.
  23462. - When the cached-routers file is an even multiple of the page size,
  23463. don't run off the end and crash. (Fixes bug 455; based on idea
  23464. from croup.)
  23465. - Fix eventdns.c behavior on Solaris: It is critical to include
  23466. orconfig.h _before_ sys/types.h, so that we can get the expected
  23467. definition of _FILE_OFFSET_BITS.
  23468. o Major bugfixes (security):
  23469. - Fix a possible buffer overrun when using BSD natd support. Bug
  23470. found by croup.
  23471. - When sending destroy cells from a circuit's origin, don't include
  23472. the reason for tearing down the circuit. The spec says we didn't,
  23473. and now we actually don't. Reported by lodger.
  23474. - Keep streamids from different exits on a circuit separate. This
  23475. bug may have allowed other routers on a given circuit to inject
  23476. cells into streams. Reported by lodger; fixes bug 446.
  23477. - If there's a never-before-connected-to guard node in our list,
  23478. never choose any guards past it. This way we don't expand our
  23479. guard list unless we need to.
  23480. o Minor bugfixes (guard nodes):
  23481. - Weight guard selection by bandwidth, so that low-bandwidth nodes
  23482. don't get overused as guards.
  23483. o Minor bugfixes (directory):
  23484. - Correctly count the number of authorities that recommend each
  23485. version. Previously, we were under-counting by 1.
  23486. - Fix a potential crash bug when we load many server descriptors at
  23487. once and some of them make others of them obsolete. Fixes bug 458.
  23488. o Minor bugfixes (hidden services):
  23489. - Stop tearing down the whole circuit when the user asks for a
  23490. connection to a port that the hidden service didn't configure.
  23491. Resolves bug 444.
  23492. o Minor bugfixes (misc):
  23493. - On Windows, we were preventing other processes from reading
  23494. cached-routers while Tor was running. Reported by janbar.
  23495. - Fix a possible (but very unlikely) bug in picking routers by
  23496. bandwidth. Add a log message to confirm that it is in fact
  23497. unlikely. Patch from lodger.
  23498. - Backport a couple of memory leak fixes.
  23499. - Backport miscellaneous cosmetic bugfixes.
  23500. Changes in version 0.1.2.14 - 2007-05-25
  23501. Tor 0.1.2.14 changes the addresses of two directory authorities (this
  23502. change especially affects those who serve or use hidden services),
  23503. and fixes several other crash- and security-related bugs.
  23504. o Directory authority changes:
  23505. - Two directory authorities (moria1 and moria2) just moved to new
  23506. IP addresses. This change will particularly affect those who serve
  23507. or use hidden services.
  23508. o Major bugfixes (crashes):
  23509. - If a directory server runs out of space in the connection table
  23510. as it's processing a begin_dir request, it will free the exit stream
  23511. but leave it attached to the circuit, leading to unpredictable
  23512. behavior. (Reported by seeess, fixes bug 425.)
  23513. - Fix a bug in dirserv_remove_invalid() that would cause authorities
  23514. to corrupt memory under some really unlikely scenarios.
  23515. - Tighten router parsing rules. (Bugs reported by Benedikt Boss.)
  23516. - Avoid segfaults when reading from mmaped descriptor file. (Reported
  23517. by lodger.)
  23518. o Major bugfixes (security):
  23519. - When choosing an entry guard for a circuit, avoid using guards
  23520. that are in the same family as the chosen exit -- not just guards
  23521. that are exactly the chosen exit. (Reported by lodger.)
  23522. o Major bugfixes (resource management):
  23523. - If a directory authority is down, skip it when deciding where to get
  23524. networkstatus objects or descriptors. Otherwise we keep asking
  23525. every 10 seconds forever. Fixes bug 384.
  23526. - Count it as a failure if we fetch a valid network-status but we
  23527. don't want to keep it. Otherwise we'll keep fetching it and keep
  23528. not wanting to keep it. Fixes part of bug 422.
  23529. - If all of our dirservers have given us bad or no networkstatuses
  23530. lately, then stop hammering them once per minute even when we
  23531. think they're failed. Fixes another part of bug 422.
  23532. o Minor bugfixes:
  23533. - Actually set the purpose correctly for descriptors inserted with
  23534. purpose=controller.
  23535. - When we have k non-v2 authorities in our DirServer config,
  23536. we ignored the last k authorities in the list when updating our
  23537. network-statuses.
  23538. - Correctly back-off from requesting router descriptors that we are
  23539. having a hard time downloading.
  23540. - Read resolv.conf files correctly on platforms where read() returns
  23541. partial results on small file reads.
  23542. - Don't rebuild the entire router store every time we get 32K of
  23543. routers: rebuild it when the journal gets very large, or when
  23544. the gaps in the store get very large.
  23545. o Minor features:
  23546. - When routers publish SVN revisions in their router descriptors,
  23547. authorities now include those versions correctly in networkstatus
  23548. documents.
  23549. - Warn when using a version of libevent before 1.3b to run a server on
  23550. OSX or BSD: these versions interact badly with userspace threads.
  23551. Changes in version 0.1.2.13 - 2007-04-24
  23552. This release features some major anonymity fixes, such as safer path
  23553. selection; better client performance; faster bootstrapping, better
  23554. address detection, and better DNS support for servers; write limiting as
  23555. well as read limiting to make servers easier to run; and a huge pile of
  23556. other features and bug fixes. The bundles also ship with Vidalia 0.0.11.
  23557. Tor 0.1.2.13 is released in memory of Rob Levin (1955-2006), aka lilo
  23558. of the Freenode IRC network, remembering his patience and vision for
  23559. free speech on the Internet.
  23560. o Major features, client performance:
  23561. - Weight directory requests by advertised bandwidth. Now we can
  23562. let servers enable write limiting but still allow most clients to
  23563. succeed at their directory requests. (We still ignore weights when
  23564. choosing a directory authority; I hope this is a feature.)
  23565. - Stop overloading exit nodes -- avoid choosing them for entry or
  23566. middle hops when the total bandwidth available from non-exit nodes
  23567. is much higher than the total bandwidth available from exit nodes.
  23568. - Rather than waiting a fixed amount of time between retrying
  23569. application connections, we wait only 10 seconds for the first,
  23570. 10 seconds for the second, and 15 seconds for each retry after
  23571. that. Hopefully this will improve the expected user experience.
  23572. - Sometimes we didn't bother sending a RELAY_END cell when an attempt
  23573. to open a stream fails; now we do in more cases. This should
  23574. make clients able to find a good exit faster in some cases, since
  23575. unhandleable requests will now get an error rather than timing out.
  23576. o Major features, client functionality:
  23577. - Implement BEGIN_DIR cells, so we can connect to a directory
  23578. server via TLS to do encrypted directory requests rather than
  23579. plaintext. Enable via the TunnelDirConns and PreferTunneledDirConns
  23580. config options if you like. For now, this feature only works if
  23581. you already have a descriptor for the destination dirserver.
  23582. - Add support for transparent application connections: this basically
  23583. bundles the functionality of trans-proxy-tor into the Tor
  23584. mainline. Now hosts with compliant pf/netfilter implementations
  23585. can redirect TCP connections straight to Tor without diverting
  23586. through SOCKS. (Based on patch from tup.)
  23587. - Add support for using natd; this allows FreeBSDs earlier than
  23588. 5.1.2 to have ipfw send connections through Tor without using
  23589. SOCKS. (Patch from Zajcev Evgeny with tweaks from tup.)
  23590. o Major features, servers:
  23591. - Setting up a dyndns name for your server is now optional: servers
  23592. with no hostname or IP address will learn their IP address by
  23593. asking the directory authorities. This code only kicks in when you
  23594. would normally have exited with a "no address" error. Nothing's
  23595. authenticated, so use with care.
  23596. - Directory servers now spool server descriptors, v1 directories,
  23597. and v2 networkstatus objects to buffers as needed rather than en
  23598. masse. They also mmap the cached-routers files. These steps save
  23599. lots of memory.
  23600. - Stop requiring clients to have well-formed certificates, and stop
  23601. checking nicknames in certificates. (Clients have certificates so
  23602. that they can look like Tor servers, but in the future we might want
  23603. to allow them to look like regular TLS clients instead. Nicknames
  23604. in certificates serve no purpose other than making our protocol
  23605. easier to recognize on the wire.) Implements proposal 106.
  23606. o Improvements on DNS support:
  23607. - Add "eventdns" asynchronous dns library originally based on code
  23608. from Adam Langley. Now we can discard the old rickety dnsworker
  23609. concept, and support a wider variety of DNS functions. Allows
  23610. multithreaded builds on NetBSD and OpenBSD again.
  23611. - Add server-side support for "reverse" DNS lookups (using PTR
  23612. records so clients can determine the canonical hostname for a given
  23613. IPv4 address). Only supported by servers using eventdns; servers
  23614. now announce in their descriptors if they don't support eventdns.
  23615. - Workaround for name servers (like Earthlink's) that hijack failing
  23616. DNS requests and replace the no-such-server answer with a "helpful"
  23617. redirect to an advertising-driven search portal. Also work around
  23618. DNS hijackers who "helpfully" decline to hijack known-invalid
  23619. RFC2606 addresses. Config option "ServerDNSDetectHijacking 0"
  23620. lets you turn it off.
  23621. - Servers now check for the case when common DNS requests are going to
  23622. wildcarded addresses (i.e. all getting the same answer), and change
  23623. their exit policy to reject *:* if it's happening.
  23624. - When asked to resolve a hostname, don't use non-exit servers unless
  23625. requested to do so. This allows servers with broken DNS to be
  23626. useful to the network.
  23627. - Start passing "ipv4" hints to getaddrinfo(), so servers don't do
  23628. useless IPv6 DNS resolves.
  23629. - Specify and implement client-side SOCKS5 interface for reverse DNS
  23630. lookups (see doc/socks-extensions.txt). Also cache them.
  23631. - When we change nameservers or IP addresses, reset and re-launch
  23632. our tests for DNS hijacking.
  23633. o Improvements on reachability testing:
  23634. - Servers send out a burst of long-range padding cells once they've
  23635. established that they're reachable. Spread them over 4 circuits,
  23636. so hopefully a few will be fast. This exercises bandwidth and
  23637. bootstraps them into the directory more quickly.
  23638. - When we find our DirPort to be reachable, publish a new descriptor
  23639. so we'll tell the world (reported by pnx).
  23640. - Directory authorities now only decide that routers are reachable
  23641. if their identity keys are as expected.
  23642. - Do DirPort reachability tests less often, since a single test
  23643. chews through many circuits before giving up.
  23644. - Avoid some false positives during reachability testing: don't try
  23645. to test via a server that's on the same /24 network as us.
  23646. - Start publishing one minute or so after we find our ORPort
  23647. to be reachable. This will help reduce the number of descriptors
  23648. we have for ourselves floating around, since it's quite likely
  23649. other things (e.g. DirPort) will change during that minute too.
  23650. - Routers no longer try to rebuild long-term connections to directory
  23651. authorities, and directory authorities no longer try to rebuild
  23652. long-term connections to all servers. We still don't hang up
  23653. connections in these two cases though -- we need to look at it
  23654. more carefully to avoid flapping, and we likely need to wait til
  23655. 0.1.1.x is obsolete.
  23656. o Improvements on rate limiting:
  23657. - Enable write limiting as well as read limiting. Now we sacrifice
  23658. capacity if we're pushing out lots of directory traffic, rather
  23659. than overrunning the user's intended bandwidth limits.
  23660. - Include TLS overhead when counting bandwidth usage; previously, we
  23661. would count only the bytes sent over TLS, but not the bytes used
  23662. to send them.
  23663. - Servers decline directory requests much more aggressively when
  23664. they're low on bandwidth. Otherwise they end up queueing more and
  23665. more directory responses, which can't be good for latency.
  23666. - But never refuse directory requests from local addresses.
  23667. - Be willing to read or write on local connections (e.g. controller
  23668. connections) even when the global rate limiting buckets are empty.
  23669. - Flush local controller connection buffers periodically as we're
  23670. writing to them, so we avoid queueing 4+ megabytes of data before
  23671. trying to flush.
  23672. - Revise and clean up the torrc.sample that we ship with; add
  23673. a section for BandwidthRate and BandwidthBurst.
  23674. o Major features, NT services:
  23675. - Install as NT_AUTHORITY\LocalService rather than as SYSTEM; add a
  23676. command-line flag so that admins can override the default by saying
  23677. "tor --service install --user "SomeUser"". This will not affect
  23678. existing installed services. Also, warn the user that the service
  23679. will look for its configuration file in the service user's
  23680. %appdata% directory. (We can't do the "hardwire the user's appdata
  23681. directory" trick any more, since we may not have read access to that
  23682. directory.)
  23683. - Support running the Tor service with a torrc not in the same
  23684. directory as tor.exe and default to using the torrc located in
  23685. the %appdata%\Tor\ of the user who installed the service. Patch
  23686. from Matt Edman.
  23687. - Add an --ignore-missing-torrc command-line option so that we can
  23688. get the "use sensible defaults if the configuration file doesn't
  23689. exist" behavior even when specifying a torrc location on the
  23690. command line.
  23691. - When stopping an NT service, wait up to 10 sec for it to actually
  23692. stop. (Patch from Matt Edman; resolves bug 295.)
  23693. o Directory authority improvements:
  23694. - Stop letting hibernating or obsolete servers affect uptime and
  23695. bandwidth cutoffs.
  23696. - Stop listing hibernating servers in the v1 directory.
  23697. - Authorities no longer recommend exits as guards if this would shift
  23698. too much load to the exit nodes.
  23699. - Authorities now specify server versions in networkstatus. This adds
  23700. about 2% to the size of compressed networkstatus docs, and allows
  23701. clients to tell which servers support BEGIN_DIR and which don't.
  23702. The implementation is forward-compatible with a proposed future
  23703. protocol version scheme not tied to Tor versions.
  23704. - DirServer configuration lines now have an orport= option so
  23705. clients can open encrypted tunnels to the authorities without
  23706. having downloaded their descriptors yet. Enabled for moria1,
  23707. moria2, tor26, and lefkada now in the default configuration.
  23708. - Add a BadDirectory flag to network status docs so that authorities
  23709. can (eventually) tell clients about caches they believe to be
  23710. broken. Not used yet.
  23711. - Allow authorities to list nodes as bad exits in their
  23712. approved-routers file by fingerprint or by address. If most
  23713. authorities set a BadExit flag for a server, clients don't think
  23714. of it as a general-purpose exit. Clients only consider authorities
  23715. that advertise themselves as listing bad exits.
  23716. - Patch from Steve Hildrey: Generate network status correctly on
  23717. non-versioning dirservers.
  23718. - Have directory authorities allow larger amounts of drift in uptime
  23719. without replacing the server descriptor: previously, a server that
  23720. restarted every 30 minutes could have 48 "interesting" descriptors
  23721. per day.
  23722. - Reserve the nickname "Unnamed" for routers that can't pick
  23723. a hostname: any router can call itself Unnamed; directory
  23724. authorities will never allocate Unnamed to any particular router;
  23725. clients won't believe that any router is the canonical Unnamed.
  23726. o Directory mirrors and clients:
  23727. - Discard any v1 directory info that's over 1 month old (for
  23728. directories) or over 1 week old (for running-routers lists).
  23729. - Clients track responses with status 503 from dirservers. After a
  23730. dirserver has given us a 503, we try not to use it until an hour has
  23731. gone by, or until we have no dirservers that haven't given us a 503.
  23732. - When we get a 503 from a directory, and we're not a server, we no
  23733. longer count the failure against the total number of failures
  23734. allowed for the object we're trying to download.
  23735. - Prepare for servers to publish descriptors less often: never
  23736. discard a descriptor simply for being too old until either it is
  23737. recommended by no authorities, or until we get a better one for
  23738. the same router. Make caches consider retaining old recommended
  23739. routers for even longer.
  23740. - Directory servers now provide 'Pragma: no-cache' and 'Expires'
  23741. headers for content, so that we can work better in the presence of
  23742. caching HTTP proxies.
  23743. - Stop fetching descriptors if you're not a dir mirror and you
  23744. haven't tried to establish any circuits lately. (This currently
  23745. causes some dangerous behavior, because when you start up again
  23746. you'll use your ancient server descriptors.)
  23747. o Major fixes, crashes:
  23748. - Stop crashing when the controller asks us to resetconf more than
  23749. one config option at once. (Vidalia 0.0.11 does this.)
  23750. - Fix a longstanding obscure crash bug that could occur when we run
  23751. out of DNS worker processes, if we're not using eventdns. (Resolves
  23752. bug 390.)
  23753. - Fix an assert that could trigger if a controller quickly set then
  23754. cleared EntryNodes. (Bug found by Udo van den Heuvel.)
  23755. - Avoid crash when telling controller about stream-status and a
  23756. stream is detached.
  23757. - Avoid sending junk to controllers or segfaulting when a controller
  23758. uses EVENT_NEW_DESC with verbose nicknames.
  23759. - Stop triggering asserts if the controller tries to extend hidden
  23760. service circuits (reported by mwenge).
  23761. - If we start a server with ClientOnly 1, then set ClientOnly to 0
  23762. and hup, stop triggering an assert based on an empty onion_key.
  23763. - Mask out all signals in sub-threads; only the libevent signal
  23764. handler should be processing them. This should prevent some crashes
  23765. on some machines using pthreads. (Patch from coderman.)
  23766. - Disable kqueue on OS X 10.3 and earlier, to fix bug 371.
  23767. o Major fixes, anonymity/security:
  23768. - Automatically avoid picking more than one node from the same
  23769. /16 network when constructing a circuit. Add an
  23770. "EnforceDistinctSubnets" option to let people disable it if they
  23771. want to operate private test networks on a single subnet.
  23772. - When generating bandwidth history, round down to the nearest
  23773. 1k. When storing accounting data, round up to the nearest 1k.
  23774. - When we're running as a server, remember when we last rotated onion
  23775. keys, so that we will rotate keys once they're a week old even if
  23776. we never stay up for a week ourselves.
  23777. - If a client asked for a server by name, and there's a named server
  23778. in our network-status but we don't have its descriptor yet, we
  23779. could return an unnamed server instead.
  23780. - Reject (most) attempts to use Tor circuits with length one. (If
  23781. many people start using Tor as a one-hop proxy, exit nodes become
  23782. a more attractive target for compromise.)
  23783. - Just because your DirPort is open doesn't mean people should be
  23784. able to remotely teach you about hidden service descriptors. Now
  23785. only accept rendezvous posts if you've got HSAuthoritativeDir set.
  23786. - Fix a potential race condition in the rpm installer. Found by
  23787. Stefan Nordhausen.
  23788. - Do not log IPs with TLS failures for incoming TLS
  23789. connections. (Fixes bug 382.)
  23790. o Major fixes, other:
  23791. - If our system clock jumps back in time, don't publish a negative
  23792. uptime in the descriptor.
  23793. - When we start during an accounting interval before it's time to wake
  23794. up, remember to wake up at the correct time. (May fix bug 342.)
  23795. - Previously, we would cache up to 16 old networkstatus documents
  23796. indefinitely, if they came from nontrusted authorities. Now we
  23797. discard them if they are more than 10 days old.
  23798. - When we have a state file we cannot parse, tell the user and
  23799. move it aside. Now we avoid situations where the user starts
  23800. Tor in 1904, Tor writes a state file with that timestamp in it,
  23801. the user fixes her clock, and Tor refuses to start.
  23802. - Publish a new descriptor after we hup/reload. This is important
  23803. if our config has changed such that we'll want to start advertising
  23804. our DirPort now, etc.
  23805. - If we are using an exit enclave and we can't connect, e.g. because
  23806. its webserver is misconfigured to not listen on localhost, then
  23807. back off and try connecting from somewhere else before we fail.
  23808. o New config options or behaviors:
  23809. - When EntryNodes are configured, rebuild the guard list to contain,
  23810. in order: the EntryNodes that were guards before; the rest of the
  23811. EntryNodes; the nodes that were guards before.
  23812. - Do not warn when individual nodes in the configuration's EntryNodes,
  23813. ExitNodes, etc are down: warn only when all possible nodes
  23814. are down. (Fixes bug 348.)
  23815. - Put a lower-bound on MaxAdvertisedBandwidth.
  23816. - Start using the state file to store bandwidth accounting data:
  23817. the bw_accounting file is now obsolete. We'll keep generating it
  23818. for a while for people who are still using 0.1.2.4-alpha.
  23819. - Try to batch changes to the state file so that we do as few
  23820. disk writes as possible while still storing important things in
  23821. a timely fashion.
  23822. - The state file and the bw_accounting file get saved less often when
  23823. the AvoidDiskWrites config option is set.
  23824. - Make PIDFile work on Windows.
  23825. - Add internal descriptions for a bunch of configuration options:
  23826. accessible via controller interface and in comments in saved
  23827. options files.
  23828. - Reject *:563 (NNTPS) in the default exit policy. We already reject
  23829. NNTP by default, so this seems like a sensible addition.
  23830. - Clients now reject hostnames with invalid characters. This should
  23831. avoid some inadvertent info leaks. Add an option
  23832. AllowNonRFC953Hostnames to disable this behavior, in case somebody
  23833. is running a private network with hosts called @, !, and #.
  23834. - Check for addresses with invalid characters at the exit as well,
  23835. and warn less verbosely when they fail. You can override this by
  23836. setting ServerDNSAllowNonRFC953Addresses to 1.
  23837. - Remove some options that have been deprecated since at least
  23838. 0.1.0.x: AccountingMaxKB, LogFile, DebugLogFile, LogLevel, and
  23839. SysLog. Use AccountingMax instead of AccountingMaxKB, and use Log
  23840. to set log options. Mark PathlenCoinWeight as obsolete.
  23841. - Stop accepting certain malformed ports in configured exit policies.
  23842. - When the user uses bad syntax in the Log config line, stop
  23843. suggesting other bad syntax as a replacement.
  23844. - Add new config option "ResolvConf" to let the server operator
  23845. choose an alternate resolve.conf file when using eventdns.
  23846. - If one of our entry guards is on the ExcludeNodes list, or the
  23847. directory authorities don't think it's a good guard, treat it as
  23848. if it were unlisted: stop using it as a guard, and throw it off
  23849. the guards list if it stays that way for a long time.
  23850. - Allow directory authorities to be marked separately as authorities
  23851. for the v1 directory protocol, the v2 directory protocol, and
  23852. as hidden service directories, to make it easier to retire old
  23853. authorities. V1 authorities should set "HSAuthoritativeDir 1"
  23854. to continue being hidden service authorities too.
  23855. - Remove 8888 as a LongLivedPort, and add 6697 (IRCS).
  23856. - Make TrackExitHosts case-insensitive, and fix the behavior of
  23857. ".suffix" TrackExitHosts items to avoid matching in the middle of
  23858. an address.
  23859. - New DirPort behavior: if you have your dirport set, you download
  23860. descriptors aggressively like a directory mirror, whether or not
  23861. your ORPort is set.
  23862. o Docs:
  23863. - Create a new file ReleaseNotes which was the old ChangeLog. The
  23864. new ChangeLog file now includes the notes for all development
  23865. versions too.
  23866. - Add a new address-spec.txt document to describe our special-case
  23867. addresses: .exit, .onion, and .noconnnect.
  23868. - Fork the v1 directory protocol into its own spec document,
  23869. and mark dir-spec.txt as the currently correct (v2) spec.
  23870. o Packaging, porting, and contrib
  23871. - "tor --verify-config" now exits with -1(255) or 0 depending on
  23872. whether the config options are bad or good.
  23873. - The Debian package now uses --verify-config when (re)starting,
  23874. to distinguish configuration errors from other errors.
  23875. - Adapt a patch from goodell to let the contrib/exitlist script
  23876. take arguments rather than require direct editing.
  23877. - Prevent the contrib/exitlist script from printing the same
  23878. result more than once.
  23879. - Add support to tor-resolve tool for reverse lookups and SOCKS5.
  23880. - In the hidden service example in torrc.sample, stop recommending
  23881. esoteric and discouraged hidden service options.
  23882. - Patch from Michael Mohr to contrib/cross.sh, so it checks more
  23883. values before failing, and always enables eventdns.
  23884. - Try to detect Windows correctly when cross-compiling.
  23885. - Libevent-1.2 exports, but does not define in its headers, strlcpy.
  23886. Try to fix this in configure.in by checking for most functions
  23887. before we check for libevent.
  23888. - Update RPMs to require libevent 1.2.
  23889. - Experimentally re-enable kqueue on OSX when using libevent 1.1b
  23890. or later. Log when we are doing this, so we can diagnose it when
  23891. it fails. (Also, recommend libevent 1.1b for kqueue and
  23892. win32 methods; deprecate libevent 1.0b harder; make libevent
  23893. recommendation system saner.)
  23894. - Build with recent (1.3+) libevents on platforms that do not
  23895. define the nonstandard types "u_int8_t" and friends.
  23896. - Remove architecture from OS X builds. The official builds are
  23897. now universal binaries.
  23898. - Run correctly on OS X platforms with case-sensitive filesystems.
  23899. - Correctly set maximum connection limit on Cygwin. (This time
  23900. for sure!)
  23901. - Start compiling on MinGW on Windows (patches from Mike Chiussi
  23902. and many others).
  23903. - Start compiling on MSVC6 on Windows (patches from Frediano Ziglio).
  23904. - Finally fix the openssl warnings from newer gccs that believe that
  23905. ignoring a return value is okay, but casting a return value and
  23906. then ignoring it is a sign of madness.
  23907. - On architectures where sizeof(int)>4, still clamp declarable
  23908. bandwidth to INT32_MAX.
  23909. o Minor features, controller:
  23910. - Warn the user when an application uses the obsolete binary v0
  23911. control protocol. We're planning to remove support for it during
  23912. the next development series, so it's good to give people some
  23913. advance warning.
  23914. - Add STREAM_BW events to report per-entry-stream bandwidth
  23915. use. (Patch from Robert Hogan.)
  23916. - Rate-limit SIGNEWNYM signals in response to controllers that
  23917. impolitely generate them for every single stream. (Patch from
  23918. mwenge; closes bug 394.)
  23919. - Add a REMAP status to stream events to note that a stream's
  23920. address has changed because of a cached address or a MapAddress
  23921. directive.
  23922. - Make REMAP stream events have a SOURCE (cache or exit), and
  23923. make them generated in every case where we get a successful
  23924. connected or resolved cell.
  23925. - Track reasons for OR connection failure; make these reasons
  23926. available via the controller interface. (Patch from Mike Perry.)
  23927. - Add a SOCKS_BAD_HOSTNAME client status event so controllers
  23928. can learn when clients are sending malformed hostnames to Tor.
  23929. - Specify and implement some of the controller status events.
  23930. - Have GETINFO dir/status/* work on hosts with DirPort disabled.
  23931. - Reimplement GETINFO so that info/names stays in sync with the
  23932. actual keys.
  23933. - Implement "GETINFO fingerprint".
  23934. - Implement "SETEVENTS GUARD" so controllers can get updates on
  23935. entry guard status as it changes.
  23936. - Make all connections to addresses of the form ".noconnect"
  23937. immediately get closed. This lets application/controller combos
  23938. successfully test whether they're talking to the same Tor by
  23939. watching for STREAM events.
  23940. - Add a REASON field to CIRC events; for backward compatibility, this
  23941. field is sent only to controllers that have enabled the extended
  23942. event format. Also, add additional reason codes to explain why
  23943. a given circuit has been destroyed or truncated. (Patches from
  23944. Mike Perry)
  23945. - Add a REMOTE_REASON field to extended CIRC events to tell the
  23946. controller why a remote OR told us to close a circuit.
  23947. - Stream events also now have REASON and REMOTE_REASON fields,
  23948. working much like those for circuit events.
  23949. - There's now a GETINFO ns/... field so that controllers can ask Tor
  23950. about the current status of a router.
  23951. - A new event type "NS" to inform a controller when our opinion of
  23952. a router's status has changed.
  23953. - Add a GETINFO events/names and GETINFO features/names so controllers
  23954. can tell which events and features are supported.
  23955. - A new CLEARDNSCACHE signal to allow controllers to clear the
  23956. client-side DNS cache without expiring circuits.
  23957. - Fix CIRC controller events so that controllers can learn the
  23958. identity digests of non-Named servers used in circuit paths.
  23959. - Let controllers ask for more useful identifiers for servers. Instead
  23960. of learning identity digests for un-Named servers and nicknames
  23961. for Named servers, the new identifiers include digest, nickname,
  23962. and indication of Named status. Off by default; see control-spec.txt
  23963. for more information.
  23964. - Add a "getinfo address" controller command so it can display Tor's
  23965. best guess to the user.
  23966. - New controller event to alert the controller when our server
  23967. descriptor has changed.
  23968. - Give more meaningful errors on controller authentication failure.
  23969. - Export the default exit policy via the control port, so controllers
  23970. don't need to guess what it is / will be later.
  23971. o Minor bugfixes, controller:
  23972. - When creating a circuit via the controller, send a 'launched'
  23973. event when we're done, so we follow the spec better.
  23974. - Correct the control spec to match how the code actually responds
  23975. to 'getinfo addr-mappings/*'. Reported by daejees.
  23976. - The control spec described a GUARDS event, but the code
  23977. implemented a GUARD event. Standardize on GUARD, but let people
  23978. ask for GUARDS too. Reported by daejees.
  23979. - Give the controller END_STREAM_REASON_DESTROY events _before_ we
  23980. clear the corresponding on_circuit variable, and remember later
  23981. that we don't need to send a redundant CLOSED event. (Resolves part
  23982. 3 of bug 367.)
  23983. - Report events where a resolve succeeded or where we got a socks
  23984. protocol error correctly, rather than calling both of them
  23985. "INTERNAL".
  23986. - Change reported stream target addresses to IP consistently when
  23987. we finally get the IP from an exit node.
  23988. - Send log messages to the controller even if they happen to be very
  23989. long.
  23990. - Flush ERR-level controller status events just like we currently
  23991. flush ERR-level log events, so that a Tor shutdown doesn't prevent
  23992. the controller from learning about current events.
  23993. - Report the circuit number correctly in STREAM CLOSED events. Bug
  23994. reported by Mike Perry.
  23995. - Do not report bizarre values for results of accounting GETINFOs
  23996. when the last second's write or read exceeds the allotted bandwidth.
  23997. - Report "unrecognized key" rather than an empty string when the
  23998. controller tries to fetch a networkstatus that doesn't exist.
  23999. - When the controller does a "GETINFO network-status", tell it
  24000. about even those routers whose descriptors are very old, and use
  24001. long nicknames where appropriate.
  24002. - Fix handling of verbose nicknames with ORCONN controller events:
  24003. make them show up exactly when requested, rather than exactly when
  24004. not requested.
  24005. - Controller signals now work on non-Unix platforms that don't define
  24006. SIGUSR1 and SIGUSR2 the way we expect.
  24007. - Respond to SIGNAL command before we execute the signal, in case
  24008. the signal shuts us down. Suggested by Karsten Loesing.
  24009. - Handle reporting OR_CONN_EVENT_NEW events to the controller.
  24010. o Minor features, code performance:
  24011. - Major performance improvement on inserting descriptors: change
  24012. algorithm from O(n^2) to O(n).
  24013. - Do not rotate onion key immediately after setting it for the first
  24014. time.
  24015. - Call router_have_min_dir_info half as often. (This is showing up in
  24016. some profiles, but not others.)
  24017. - When using GCC, make log_debug never get called at all, and its
  24018. arguments never get evaluated, when no debug logs are configured.
  24019. (This is showing up in some profiles, but not others.)
  24020. - Statistics dumped by -USR2 now include a breakdown of public key
  24021. operations, for profiling.
  24022. - Make the common memory allocation path faster on machines where
  24023. malloc(0) returns a pointer.
  24024. - Split circuit_t into origin_circuit_t and or_circuit_t, and
  24025. split connection_t into edge, or, dir, control, and base structs.
  24026. These will save quite a bit of memory on busy servers, and they'll
  24027. also help us track down bugs in the code and bugs in the spec.
  24028. - Use OpenSSL's AES implementation on platforms where it's faster.
  24029. This could save us as much as 10% CPU usage.
  24030. o Minor features, descriptors and descriptor handling:
  24031. - Avoid duplicate entries on MyFamily line in server descriptor.
  24032. - When Tor receives a router descriptor that it asked for, but
  24033. no longer wants (because it has received fresh networkstatuses
  24034. in the meantime), do not warn the user. Cache the descriptor if
  24035. we're a cache; drop it if we aren't.
  24036. - Servers no longer ever list themselves in their "family" line,
  24037. even if configured to do so. This makes it easier to configure
  24038. family lists conveniently.
  24039. o Minor fixes, confusing/misleading log messages:
  24040. - Display correct results when reporting which versions are
  24041. recommended, and how recommended they are. (Resolves bug 383.)
  24042. - Inform the server operator when we decide not to advertise a
  24043. DirPort due to AccountingMax enabled or a low BandwidthRate.
  24044. - Only include function names in log messages for info/debug messages.
  24045. For notice/warn/err, the content of the message should be clear on
  24046. its own, and printing the function name only confuses users.
  24047. - Remove even more protocol-related warnings from Tor server logs,
  24048. such as bad TLS handshakes and malformed begin cells.
  24049. - Fix bug 314: Tor clients issued "unsafe socks" warnings even
  24050. when the IP address is mapped through MapAddress to a hostname.
  24051. - Fix misleading log messages: an entry guard that is "unlisted",
  24052. as well as not known to be "down" (because we've never heard
  24053. of it), is not therefore "up".
  24054. o Minor fixes, old/obsolete behavior:
  24055. - Start assuming we can use a create_fast cell if we don't know
  24056. what version a router is running.
  24057. - We no longer look for identity and onion keys in "identity.key" and
  24058. "onion.key" -- these were replaced by secret_id_key and
  24059. secret_onion_key in 0.0.8pre1.
  24060. - We no longer require unrecognized directory entries to be
  24061. preceded by "opt".
  24062. - Drop compatibility with obsolete Tors that permit create cells
  24063. to have the wrong circ_id_type.
  24064. - Remove code to special-case "-cvs" ending, since it has not
  24065. actually mattered since 0.0.9.
  24066. - Don't re-write the fingerprint file every restart, unless it has
  24067. changed.
  24068. o Minor fixes, misc client-side behavior:
  24069. - Always remove expired routers and networkstatus docs before checking
  24070. whether we have enough information to build circuits. (Fixes
  24071. bug 373.)
  24072. - When computing clock skew from directory HTTP headers, consider what
  24073. time it was when we finished asking for the directory, not what
  24074. time it is now.
  24075. - Make our socks5 handling more robust to broken socks clients:
  24076. throw out everything waiting on the buffer in between socks
  24077. handshake phases, since they can't possibly (so the theory
  24078. goes) have predicted what we plan to respond to them.
  24079. - Expire socks connections if they spend too long waiting for the
  24080. handshake to finish. Previously we would let them sit around for
  24081. days, if the connecting application didn't close them either.
  24082. - And if the socks handshake hasn't started, don't send a
  24083. "DNS resolve socks failed" handshake reply; just close it.
  24084. - If the user asks to use invalid exit nodes, be willing to use
  24085. unstable ones.
  24086. - Track unreachable entry guards correctly: don't conflate
  24087. 'unreachable by us right now' with 'listed as down by the directory
  24088. authorities'. With the old code, if a guard was unreachable by us
  24089. but listed as running, it would clog our guard list forever.
  24090. - Behave correctly in case we ever have a network with more than
  24091. 2GB/s total advertised capacity.
  24092. - Claim a commonname of Tor, rather than TOR, in TLS handshakes.
  24093. - Fix a memory leak when we ask for "all" networkstatuses and we
  24094. get one we don't recognize.
  24095. Changes in version 0.1.1.26 - 2006-12-14
  24096. o Security bugfixes:
  24097. - Stop sending the HttpProxyAuthenticator string to directory
  24098. servers when directory connections are tunnelled through Tor.
  24099. - Clients no longer store bandwidth history in the state file.
  24100. - Do not log introduction points for hidden services if SafeLogging
  24101. is set.
  24102. o Minor bugfixes:
  24103. - Fix an assert failure when a directory authority sets
  24104. AuthDirRejectUnlisted and then receives a descriptor from an
  24105. unlisted router (reported by seeess).
  24106. Changes in version 0.1.1.25 - 2006-11-04
  24107. o Major bugfixes:
  24108. - When a client asks us to resolve (rather than connect to)
  24109. an address, and we have a cached answer, give them the cached
  24110. answer. Previously, we would give them no answer at all.
  24111. - We were building exactly the wrong circuits when we predict
  24112. hidden service requirements, meaning Tor would have to build all
  24113. its circuits on demand.
  24114. - If none of our live entry guards have a high uptime, but we
  24115. require a guard with a high uptime, try adding a new guard before
  24116. we give up on the requirement. This patch should make long-lived
  24117. connections more stable on average.
  24118. - When testing reachability of our DirPort, don't launch new
  24119. tests when there's already one in progress -- unreachable
  24120. servers were stacking up dozens of testing streams.
  24121. o Security bugfixes:
  24122. - When the user sends a NEWNYM signal, clear the client-side DNS
  24123. cache too. Otherwise we continue to act on previous information.
  24124. o Minor bugfixes:
  24125. - Avoid a memory corruption bug when creating a hash table for
  24126. the first time.
  24127. - Avoid possibility of controller-triggered crash when misusing
  24128. certain commands from a v0 controller on platforms that do not
  24129. handle printf("%s",NULL) gracefully.
  24130. - Avoid infinite loop on unexpected controller input.
  24131. - Don't log spurious warnings when we see a circuit close reason we
  24132. don't recognize; it's probably just from a newer version of Tor.
  24133. - Add Vidalia to the OS X uninstaller script, so when we uninstall
  24134. Tor/Privoxy we also uninstall Vidalia.
  24135. Changes in version 0.1.1.24 - 2006-09-29
  24136. o Major bugfixes:
  24137. - Allow really slow clients to not hang up five minutes into their
  24138. directory downloads (suggested by Adam J. Richter).
  24139. - Fix major performance regression from 0.1.0.x: instead of checking
  24140. whether we have enough directory information every time we want to
  24141. do something, only check when the directory information has changed.
  24142. This should improve client CPU usage by 25-50%.
  24143. - Don't crash if, after a server has been running for a while,
  24144. it can't resolve its hostname.
  24145. - When a client asks us to resolve (not connect to) an address,
  24146. and we have a cached answer, give them the cached answer.
  24147. Previously, we would give them no answer at all.
  24148. o Minor bugfixes:
  24149. - Allow Tor to start when RunAsDaemon is set but no logs are set.
  24150. - Don't crash when the controller receives a third argument to an
  24151. "extendcircuit" request.
  24152. - Controller protocol fixes: fix encoding in "getinfo addr-mappings"
  24153. response; fix error code when "getinfo dir/status/" fails.
  24154. - Fix configure.in to not produce broken configure files with
  24155. more recent versions of autoconf. Thanks to Clint for his auto*
  24156. voodoo.
  24157. - Fix security bug on NetBSD that could allow someone to force
  24158. uninitialized RAM to be sent to a server's DNS resolver. This
  24159. only affects NetBSD and other platforms that do not bounds-check
  24160. tolower().
  24161. - Warn user when using libevent 1.1a or earlier with win32 or kqueue
  24162. methods: these are known to be buggy.
  24163. - If we're a directory mirror and we ask for "all" network status
  24164. documents, we would discard status documents from authorities
  24165. we don't recognize.
  24166. Changes in version 0.1.1.23 - 2006-07-30
  24167. o Major bugfixes:
  24168. - Fast Tor servers, especially exit nodes, were triggering asserts
  24169. due to a bug in handling the list of pending DNS resolves. Some
  24170. bugs still remain here; we're hunting them.
  24171. - Entry guards could crash clients by sending unexpected input.
  24172. - More fixes on reachability testing: if you find yourself reachable,
  24173. then don't ever make any client requests (so you stop predicting
  24174. circuits), then hup or have your clock jump, then later your IP
  24175. changes, you won't think circuits are working, so you won't try to
  24176. test reachability, so you won't publish.
  24177. o Minor bugfixes:
  24178. - Avoid a crash if the controller does a resetconf firewallports
  24179. and then a setconf fascistfirewall=1.
  24180. - Avoid an integer underflow when the dir authority decides whether
  24181. a router is stable: we might wrongly label it stable, and compute
  24182. a slightly wrong median stability, when a descriptor is published
  24183. later than now.
  24184. - Fix a place where we might trigger an assert if we can't build our
  24185. own server descriptor yet.
  24186. Changes in version 0.1.1.22 - 2006-07-05
  24187. o Major bugfixes:
  24188. - Fix a big bug that was causing servers to not find themselves
  24189. reachable if they changed IP addresses. Since only 0.1.1.22+
  24190. servers can do reachability testing correctly, now we automatically
  24191. make sure to test via one of these.
  24192. - Fix to allow clients and mirrors to learn directory info from
  24193. descriptor downloads that get cut off partway through.
  24194. - Directory authorities had a bug in deciding if a newly published
  24195. descriptor was novel enough to make everybody want a copy -- a few
  24196. servers seem to be publishing new descriptors many times a minute.
  24197. o Minor bugfixes:
  24198. - Fix a rare bug that was causing some servers to complain about
  24199. "closing wedged cpuworkers" and skip some circuit create requests.
  24200. - Make the Exit flag in directory status documents actually work.
  24201. Changes in version 0.1.1.21 - 2006-06-10
  24202. o Crash and assert fixes from 0.1.1.20:
  24203. - Fix a rare crash on Tor servers that have enabled hibernation.
  24204. - Fix a seg fault on startup for Tor networks that use only one
  24205. directory authority.
  24206. - Fix an assert from a race condition that occurs on Tor servers
  24207. while exiting, where various threads are trying to log that they're
  24208. exiting, and delete the logs, at the same time.
  24209. - Make our unit tests pass again on certain obscure platforms.
  24210. o Other fixes:
  24211. - Add support for building SUSE RPM packages.
  24212. - Speed up initial bootstrapping for clients: if we are making our
  24213. first ever connection to any entry guard, then don't mark it down
  24214. right after that.
  24215. - When only one Tor server in the network is labelled as a guard,
  24216. and we've already picked him, we would cycle endlessly picking him
  24217. again, being unhappy about it, etc. Now we specifically exclude
  24218. current guards when picking a new guard.
  24219. - Servers send create cells more reliably after the TLS connection
  24220. is established: we were sometimes forgetting to send half of them
  24221. when we had more than one pending.
  24222. - If we get a create cell that asks us to extend somewhere, but the
  24223. Tor server there doesn't match the expected digest, we now send
  24224. a destroy cell back, rather than silently doing nothing.
  24225. - Make options->RedirectExit work again.
  24226. - Make cookie authentication for the controller work again.
  24227. - Stop being picky about unusual characters in the arguments to
  24228. mapaddress. It's none of our business.
  24229. - Add a new config option "TestVia" that lets you specify preferred
  24230. middle hops to use for test circuits. Perhaps this will let me
  24231. debug the reachability problems better.
  24232. o Log / documentation fixes:
  24233. - If we're a server and some peer has a broken TLS certificate, don't
  24234. log about it unless ProtocolWarnings is set, i.e., we want to hear
  24235. about protocol violations by others.
  24236. - Fix spelling of VirtualAddrNetwork in man page.
  24237. - Add a better explanation at the top of the autogenerated torrc file
  24238. about what happened to our old torrc.
  24239. Changes in version 0.1.1.20 - 2006-05-23
  24240. o Crash and assert fixes from 0.1.0.17:
  24241. - Fix assert bug in close_logs() on exit: when we close and delete
  24242. logs, remove them all from the global "logfiles" list.
  24243. - Fix an assert error when we're out of space in the connection_list
  24244. and we try to post a hidden service descriptor (reported by Peter
  24245. Palfrader).
  24246. - Fix a rare assert error when we've tried all intro points for
  24247. a hidden service and we try fetching the service descriptor again:
  24248. "Assertion conn->state != AP_CONN_STATE_RENDDESC_WAIT failed".
  24249. - Setconf SocksListenAddress kills Tor if it fails to bind. Now back
  24250. out and refuse the setconf if it would fail.
  24251. - If you specify a relative torrc path and you set RunAsDaemon in
  24252. your torrc, then it chdir()'s to the new directory. If you then
  24253. HUP, it tries to load the new torrc location, fails, and exits.
  24254. The fix: no longer allow a relative path to torrc when using -f.
  24255. - Check for integer overflows in more places, when adding elements
  24256. to smartlists. This could possibly prevent a buffer overflow
  24257. on malicious huge inputs.
  24258. o Security fixes, major:
  24259. - When we're printing strings from the network, don't try to print
  24260. non-printable characters. Now we're safer against shell escape
  24261. sequence exploits, and also against attacks to fool users into
  24262. misreading their logs.
  24263. - Implement entry guards: automatically choose a handful of entry
  24264. nodes and stick with them for all circuits. Only pick new guards
  24265. when the ones you have are unsuitable, and if the old guards
  24266. become suitable again, switch back. This will increase security
  24267. dramatically against certain end-point attacks. The EntryNodes
  24268. config option now provides some hints about which entry guards you
  24269. want to use most; and StrictEntryNodes means to only use those.
  24270. Fixes CVE-2006-0414.
  24271. - Implement exit enclaves: if we know an IP address for the
  24272. destination, and there's a running Tor server at that address
  24273. which allows exit to the destination, then extend the circuit to
  24274. that exit first. This provides end-to-end encryption and end-to-end
  24275. authentication. Also, if the user wants a .exit address or enclave,
  24276. use 4 hops rather than 3, and cannibalize a general circ for it
  24277. if you can.
  24278. - Obey our firewall options more faithfully:
  24279. . If we can't get to a dirserver directly, try going via Tor.
  24280. . Don't ever try to connect (as a client) to a place our
  24281. firewall options forbid.
  24282. . If we specify a proxy and also firewall options, obey the
  24283. firewall options even when we're using the proxy: some proxies
  24284. can only proxy to certain destinations.
  24285. - Make clients regenerate their keys when their IP address changes.
  24286. - For the OS X package's modified privoxy config file, comment
  24287. out the "logfile" line so we don't log everything passed
  24288. through privoxy.
  24289. - Our TLS handshakes were generating a single public/private
  24290. keypair for the TLS context, rather than making a new one for
  24291. each new connection. Oops. (But we were still rotating them
  24292. periodically, so it's not so bad.)
  24293. - When we were cannibalizing a circuit with a particular exit
  24294. node in mind, we weren't checking to see if that exit node was
  24295. already present earlier in the circuit. Now we are.
  24296. - Require server descriptors to list IPv4 addresses -- hostnames
  24297. are no longer allowed. This also fixes potential vulnerabilities
  24298. to servers providing hostnames as their address and then
  24299. preferentially resolving them so they can partition users.
  24300. - Our logic to decide if the OR we connected to was the right guy
  24301. was brittle and maybe open to a mitm for invalid routers.
  24302. o Security fixes, minor:
  24303. - Adjust tor-spec.txt to parameterize cell and key lengths. Now
  24304. Ian Goldberg can prove things about our handshake protocol more
  24305. easily.
  24306. - Make directory authorities generate a separate "guard" flag to
  24307. mean "would make a good entry guard". Clients now honor the
  24308. is_guard flag rather than looking at is_fast or is_stable.
  24309. - Try to list MyFamily elements by key, not by nickname, and warn
  24310. if we've not heard of a server.
  24311. - Start using RAND_bytes rather than RAND_pseudo_bytes from
  24312. OpenSSL. Also, reseed our entropy every hour, not just at
  24313. startup. And add entropy in 512-bit chunks, not 160-bit chunks.
  24314. - Refuse server descriptors where the fingerprint line doesn't match
  24315. the included identity key. Tor doesn't care, but other apps (and
  24316. humans) might actually be trusting the fingerprint line.
  24317. - We used to kill the circuit when we receive a relay command we
  24318. don't recognize. Now we just drop that cell.
  24319. - Fix a bug found by Lasse Overlier: when we were making internal
  24320. circuits (intended to be cannibalized later for rendezvous and
  24321. introduction circuits), we were picking them so that they had
  24322. useful exit nodes. There was no need for this, and it actually
  24323. aids some statistical attacks.
  24324. - Start treating internal circuits and exit circuits separately.
  24325. It's important to keep them separate because internal circuits
  24326. have their last hops picked like middle hops, rather than like
  24327. exit hops. So exiting on them will break the user's expectations.
  24328. - Fix a possible way to DoS dirservers.
  24329. - When the client asked for a rendezvous port that the hidden
  24330. service didn't want to provide, we were sending an IP address
  24331. back along with the end cell. Fortunately, it was zero. But stop
  24332. that anyway.
  24333. o Packaging improvements:
  24334. - Implement --with-libevent-dir option to ./configure. Improve
  24335. search techniques to find libevent, and use those for openssl too.
  24336. - Fix a couple of bugs in OpenSSL detection. Deal better when
  24337. there are multiple SSLs installed with different versions.
  24338. - Avoid warnings about machine/limits.h on Debian GNU/kFreeBSD.
  24339. - On non-gcc compilers (e.g. Solaris's cc), use "-g -O" instead of
  24340. "-Wall -g -O2".
  24341. - Make unit tests (and other invocations that aren't the real Tor)
  24342. run without launching listeners, creating subdirectories, and so on.
  24343. - The OS X installer was adding a symlink for tor_resolve but
  24344. the binary was called tor-resolve (reported by Thomas Hardly).
  24345. - Now we can target arch and OS in rpm builds (contributed by
  24346. Phobos). Also make the resulting dist-rpm filename match the
  24347. target arch.
  24348. - Apply Matt Ghali's --with-syslog-facility patch to ./configure
  24349. if you log to syslog and want something other than LOG_DAEMON.
  24350. - Fix the torify (tsocks) config file to not use Tor for localhost
  24351. connections.
  24352. - Start shipping socks-extensions.txt, tor-doc-unix.html,
  24353. tor-doc-server.html, and stylesheet.css in the tarball.
  24354. - Stop shipping tor-doc.html, INSTALL, and README in the tarball.
  24355. They are useless now.
  24356. - Add Peter Palfrader's contributed check-tor script. It lets you
  24357. easily check whether a given server (referenced by nickname)
  24358. is reachable by you.
  24359. - Add BSD-style contributed startup script "rc.subr" from Peter
  24360. Thoenen.
  24361. o Directory improvements -- new directory protocol:
  24362. - See tor/doc/dir-spec.txt for all the juicy details. Key points:
  24363. - Authorities and caches publish individual descriptors (by
  24364. digest, by fingerprint, by "all", and by "tell me yours").
  24365. - Clients don't download or use the old directory anymore. Now they
  24366. download network-statuses from the directory authorities, and
  24367. fetch individual server descriptors as needed from mirrors.
  24368. - Clients don't download descriptors of non-running servers.
  24369. - Download descriptors by digest, not by fingerprint. Caches try to
  24370. download all listed digests from authorities; clients try to
  24371. download "best" digests from caches. This avoids partitioning
  24372. and isolating attacks better.
  24373. - Only upload a new server descriptor when options change, 18
  24374. hours have passed, uptime is reset, or bandwidth changes a lot.
  24375. - Directory authorities silently throw away new descriptors that
  24376. haven't changed much if the timestamps are similar. We do this to
  24377. tolerate older Tor servers that upload a new descriptor every 15
  24378. minutes. (It seemed like a good idea at the time.)
  24379. - Clients choose directory servers from the network status lists,
  24380. not from their internal list of router descriptors. Now they can
  24381. go to caches directly rather than needing to go to authorities
  24382. to bootstrap the first set of descriptors.
  24383. - When picking a random directory, prefer non-authorities if any
  24384. are known.
  24385. - Add a new flag to network-status indicating whether the server
  24386. can answer v2 directory requests too.
  24387. - Directory mirrors now cache up to 16 unrecognized network-status
  24388. docs, so new directory authorities will be cached too.
  24389. - Stop parsing, storing, or using running-routers output (but
  24390. mirrors still cache and serve it).
  24391. - Clients consider a threshold of "versioning" directory authorities
  24392. before deciding whether to warn the user that he's obsolete.
  24393. - Authorities publish separate sorted lists of recommended versions
  24394. for clients and for servers.
  24395. - Change DirServers config line to note which dirs are v1 authorities.
  24396. - Put nicknames on the DirServer line, so we can refer to them
  24397. without requiring all our users to memorize their IP addresses.
  24398. - Remove option when getting directory cache to see whether they
  24399. support running-routers; they all do now. Replace it with one
  24400. to see whether caches support v2 stuff.
  24401. - Stop listing down or invalid nodes in the v1 directory. This
  24402. reduces its bulk by about 1/3, and reduces load on mirrors.
  24403. - Mirrors no longer cache the v1 directory as often.
  24404. - If we as a directory mirror don't know of any v1 directory
  24405. authorities, then don't try to cache any v1 directories.
  24406. o Other directory improvements:
  24407. - Add lefkada.eecs.harvard.edu and tor.dizum.com as fourth and
  24408. fifth authoritative directory servers.
  24409. - Directory authorities no longer require an open connection from
  24410. a server to consider him "reachable". We need this change because
  24411. when we add new directory authorities, old servers won't know not
  24412. to hang up on them.
  24413. - Dir authorities now do their own external reachability testing
  24414. of each server, and only list as running the ones they found to
  24415. be reachable. We also send back warnings to the server's logs if
  24416. it uploads a descriptor that we already believe is unreachable.
  24417. - Spread the directory authorities' reachability testing over the
  24418. entire testing interval, so we don't try to do 500 TLS's at once
  24419. every 20 minutes.
  24420. - Make the "stable" router flag in network-status be the median of
  24421. the uptimes of running valid servers, and make clients pay
  24422. attention to the network-status flags. Thus the cutoff adapts
  24423. to the stability of the network as a whole, making IRC, IM, etc
  24424. connections more reliable.
  24425. - Make the v2 dir's "Fast" flag based on relative capacity, just
  24426. like "Stable" is based on median uptime. Name everything in the
  24427. top 7/8 Fast, and only the top 1/2 gets to be a Guard.
  24428. - Retry directory requests if we fail to get an answer we like
  24429. from a given dirserver (we were retrying before, but only if
  24430. we fail to connect).
  24431. - Return a robots.txt on our dirport to discourage google indexing.
  24432. o Controller protocol improvements:
  24433. - Revised controller protocol (version 1) that uses ascii rather
  24434. than binary: tor/doc/control-spec.txt. Add supporting libraries
  24435. in python and java and c# so you can use the controller from your
  24436. applications without caring how our protocol works.
  24437. - Allow the DEBUG controller event to work again. Mark certain log
  24438. entries as "don't tell this to controllers", so we avoid cycles.
  24439. - New controller function "getinfo accounting", to ask how
  24440. many bytes we've used in this time period.
  24441. - Add a "resetconf" command so you can set config options like
  24442. AllowUnverifiedNodes and LongLivedPorts to "". Also, if you give
  24443. a config option in the torrc with no value, then it clears it
  24444. entirely (rather than setting it to its default).
  24445. - Add a "getinfo config-file" to tell us where torrc is. Also
  24446. expose guard nodes, config options/names.
  24447. - Add a "quit" command (when when using the controller manually).
  24448. - Add a new signal "newnym" to "change pseudonyms" -- that is, to
  24449. stop using any currently-dirty circuits for new streams, so we
  24450. don't link new actions to old actions. This also occurs on HUP
  24451. or "signal reload".
  24452. - If we would close a stream early (e.g. it asks for a .exit that
  24453. we know would refuse it) but the LeaveStreamsUnattached config
  24454. option is set by the controller, then don't close it.
  24455. - Add a new controller event type "authdir_newdescs" that allows
  24456. controllers to get all server descriptors that were uploaded to
  24457. a router in its role as directory authority.
  24458. - New controller option "getinfo desc/all-recent" to fetch the
  24459. latest server descriptor for every router that Tor knows about.
  24460. - Fix the controller's "attachstream 0" command to treat conn like
  24461. it just connected, doing address remapping, handling .exit and
  24462. .onion idioms, and so on. Now we're more uniform in making sure
  24463. that the controller hears about new and closing connections.
  24464. - Permit transitioning from ORPort==0 to ORPort!=0, and back, from
  24465. the controller. Also, rotate dns and cpu workers if the controller
  24466. changes options that will affect them; and initialize the dns
  24467. worker cache tree whether or not we start out as a server.
  24468. - Add a new circuit purpose 'controller' to let the controller ask
  24469. for a circuit that Tor won't try to use. Extend the "extendcircuit"
  24470. controller command to let you specify the purpose if you're starting
  24471. a new circuit. Add a new "setcircuitpurpose" controller command to
  24472. let you change a circuit's purpose after it's been created.
  24473. - Let the controller ask for "getinfo dir/server/foo" so it can ask
  24474. directly rather than connecting to the dir port. "getinfo
  24475. dir/status/foo" also works, but currently only if your DirPort
  24476. is enabled.
  24477. - Let the controller tell us about certain router descriptors
  24478. that it doesn't want Tor to use in circuits. Implement
  24479. "setrouterpurpose" and modify "+postdescriptor" to do this.
  24480. - If the controller's *setconf commands fail, collect an error
  24481. message in a string and hand it back to the controller -- don't
  24482. just tell them to go read their logs.
  24483. o Scalability, resource management, and performance:
  24484. - Fix a major load balance bug: we were round-robin reading in 16 KB
  24485. chunks, and servers with bandwidthrate of 20 KB, while downloading
  24486. a 600 KB directory, would starve their other connections. Now we
  24487. try to be a bit more fair.
  24488. - Be more conservative about whether to advertise our DirPort.
  24489. The main change is to not advertise if we're running at capacity
  24490. and either a) we could hibernate ever or b) our capacity is low
  24491. and we're using a default DirPort.
  24492. - We weren't cannibalizing circuits correctly for
  24493. CIRCUIT_PURPOSE_C_ESTABLISH_REND and
  24494. CIRCUIT_PURPOSE_S_ESTABLISH_INTRO, so we were being forced to
  24495. build those from scratch. This should make hidden services faster.
  24496. - Predict required circuits better, with an eye toward making hidden
  24497. services faster on the service end.
  24498. - Compress exit policies even more: look for duplicate lines and
  24499. remove them.
  24500. - Generate 18.0.0.0/8 address policy format in descs when we can;
  24501. warn when the mask is not reducible to a bit-prefix.
  24502. - There used to be two ways to specify your listening ports in a
  24503. server descriptor: on the "router" line and with a separate "ports"
  24504. line. Remove support for the "ports" line.
  24505. - Reduce memory requirements in our structs by changing the order
  24506. of fields. Replace balanced trees with hash tables. Inline
  24507. bottleneck smartlist functions. Add a "Map from digest to void*"
  24508. abstraction so we can do less hex encoding/decoding, and use it
  24509. in router_get_by_digest(). Many other CPU and memory improvements.
  24510. - Allow tor_gzip_uncompress to extract as much as possible from
  24511. truncated compressed data. Try to extract as many
  24512. descriptors as possible from truncated http responses (when
  24513. purpose is DIR_PURPOSE_FETCH_ROUTERDESC).
  24514. - Make circ->onionskin a pointer, not a static array. moria2 was using
  24515. 125000 circuit_t's after it had been up for a few weeks, which
  24516. translates to 20+ megs of wasted space.
  24517. - The private half of our EDH handshake keys are now chosen out
  24518. of 320 bits, not 1024 bits. (Suggested by Ian Goldberg.)
  24519. - Stop doing the complex voodoo overkill checking for insecure
  24520. Diffie-Hellman keys. Just check if it's in [2,p-2] and be happy.
  24521. - Do round-robin writes for TLS of at most 16 kB per write. This
  24522. might be more fair on loaded Tor servers.
  24523. - Do not use unaligned memory access on alpha, mips, or mipsel.
  24524. It *works*, but is very slow, so we treat them as if it doesn't.
  24525. o Other bugfixes and improvements:
  24526. - Start storing useful information to $DATADIR/state, so we can
  24527. remember things across invocations of Tor. Retain unrecognized
  24528. lines so we can be forward-compatible, and write a TorVersion line
  24529. so we can be backward-compatible.
  24530. - If ORPort is set, Address is not explicitly set, and our hostname
  24531. resolves to a private IP address, try to use an interface address
  24532. if it has a public address. Now Windows machines that think of
  24533. themselves as localhost can guess their address.
  24534. - Regenerate our local descriptor if it's dirty and we try to use
  24535. it locally (e.g. if it changes during reachability detection).
  24536. This was causing some Tor servers to keep publishing the same
  24537. initial descriptor forever.
  24538. - Tor servers with dynamic IP addresses were needing to wait 18
  24539. hours before they could start doing reachability testing using
  24540. the new IP address and ports. This is because they were using
  24541. the internal descriptor to learn what to test, yet they were only
  24542. rebuilding the descriptor once they decided they were reachable.
  24543. - It turns out we couldn't bootstrap a network since we added
  24544. reachability detection in 0.1.0.1-rc. Good thing the Tor network
  24545. has never gone down. Add an AssumeReachable config option to let
  24546. servers and authorities bootstrap. When we're trying to build a
  24547. high-uptime or high-bandwidth circuit but there aren't enough
  24548. suitable servers, try being less picky rather than simply failing.
  24549. - Newly bootstrapped Tor networks couldn't establish hidden service
  24550. circuits until they had nodes with high uptime. Be more tolerant.
  24551. - Really busy servers were keeping enough circuits open on stable
  24552. connections that they were wrapping around the circuit_id
  24553. space. (It's only two bytes.) This exposed a bug where we would
  24554. feel free to reuse a circuit_id even if it still exists but has
  24555. been marked for close. Try to fix this bug. Some bug remains.
  24556. - When we fail to bind or listen on an incoming or outgoing
  24557. socket, we now close it before refusing, rather than just
  24558. leaking it. (Thanks to Peter Palfrader for finding.)
  24559. - Fix a file descriptor leak in start_daemon().
  24560. - On Windows, you can't always reopen a port right after you've
  24561. closed it. So change retry_listeners() to only close and re-open
  24562. ports that have changed.
  24563. - Workaround a problem with some http proxies that refuse GET
  24564. requests that specify "Content-Length: 0". Reported by Adrian.
  24565. - Recover better from TCP connections to Tor servers that are
  24566. broken but don't tell you (it happens!); and rotate TLS
  24567. connections once a week.
  24568. - Fix a scary-looking but apparently harmless bug where circuits
  24569. would sometimes start out in state CIRCUIT_STATE_OR_WAIT at
  24570. servers, and never switch to state CIRCUIT_STATE_OPEN.
  24571. - Check for even more Windows version flags when writing the platform
  24572. string in server descriptors, and note any we don't recognize.
  24573. - Add reasons to DESTROY and RELAY_TRUNCATED cells, so clients can
  24574. get a better idea of why their circuits failed. Not used yet.
  24575. - Add TTLs to RESOLVED, CONNECTED, and END_REASON_EXITPOLICY cells.
  24576. We don't use them yet, but maybe one day our DNS resolver will be
  24577. able to discover them.
  24578. - Let people type "tor --install" as well as "tor -install" when they
  24579. want to make it an NT service.
  24580. - Looks like we were never delivering deflated (i.e. compressed)
  24581. running-routers lists, even when asked. Oops.
  24582. - We were leaking some memory every time the client changed IPs.
  24583. - Clean up more of the OpenSSL memory when exiting, so we can detect
  24584. memory leaks better.
  24585. - Never call free() on tor_malloc()d memory. This will help us
  24586. use dmalloc to detect memory leaks.
  24587. - Some Tor servers process billions of cells per day. These
  24588. statistics are now uint64_t's.
  24589. - Check [X-]Forwarded-For headers in HTTP requests when generating
  24590. log messages. This lets people run dirservers (and caches) behind
  24591. Apache but still know which IP addresses are causing warnings.
  24592. - Fix minor integer overflow in calculating when we expect to use up
  24593. our bandwidth allocation before hibernating.
  24594. - Lower the minimum required number of file descriptors to 1000,
  24595. so we can have some overhead for Valgrind on Linux, where the
  24596. default ulimit -n is 1024.
  24597. - Stop writing the "router.desc" file, ever. Nothing uses it anymore,
  24598. and its existence is confusing some users.
  24599. o Config option fixes:
  24600. - Add a new config option ExitPolicyRejectPrivate which defaults
  24601. to on. Now all exit policies will begin with rejecting private
  24602. addresses, unless the server operator explicitly turns it off.
  24603. - Bump the default bandwidthrate to 3 MB, and burst to 6 MB.
  24604. - Add new ReachableORAddresses and ReachableDirAddresses options
  24605. that understand address policies. FascistFirewall is now a synonym
  24606. for "ReachableORAddresses *:443", "ReachableDirAddresses *:80".
  24607. - Start calling it FooListenAddress rather than FooBindAddress,
  24608. since few of our users know what it means to bind an address
  24609. or port.
  24610. - If the user gave Tor an odd number of command-line arguments,
  24611. we were silently ignoring the last one. Now we complain and fail.
  24612. This wins the oldest-bug prize -- this bug has been present since
  24613. November 2002, as released in Tor 0.0.0.
  24614. - If you write "HiddenServicePort 6667 127.0.0.1 6668" in your
  24615. torrc rather than "HiddenServicePort 6667 127.0.0.1:6668",
  24616. it would silently ignore the 6668.
  24617. - If we get a linelist or linelist_s config option from the torrc,
  24618. e.g. ExitPolicy, and it has no value, warn and skip rather than
  24619. silently resetting it to its default.
  24620. - Setconf was appending items to linelists, not clearing them.
  24621. - Add MyFamily to torrc.sample in the server section, so operators
  24622. will be more likely to learn that it exists.
  24623. - Make ContactInfo mandatory for authoritative directory servers.
  24624. - MaxConn has been obsolete for a while now. Document the ConnLimit
  24625. config option, which is a *minimum* number of file descriptors
  24626. that must be available else Tor refuses to start.
  24627. - Get rid of IgnoreVersion undocumented config option, and make us
  24628. only warn, never exit, when we're running an obsolete version.
  24629. - Make MonthlyAccountingStart config option truly obsolete now.
  24630. - Correct the man page entry on TrackHostExitsExpire.
  24631. - Let directory authorities start even if they don't specify an
  24632. Address config option.
  24633. - Change "AllowUnverifiedNodes" to "AllowInvalidNodes", to
  24634. reflect the updated flags in our v2 dir protocol.
  24635. o Config option features:
  24636. - Add a new config option FastFirstHopPK (on by default) so clients
  24637. do a trivial crypto handshake for their first hop, since TLS has
  24638. already taken care of confidentiality and authentication.
  24639. - Let the user set ControlListenAddress in the torrc. This can be
  24640. dangerous, but there are some cases (like a secured LAN) where it
  24641. makes sense.
  24642. - New config options to help controllers: FetchServerDescriptors
  24643. and FetchHidServDescriptors for whether to fetch server
  24644. info and hidserv info or let the controller do it, and
  24645. PublishServerDescriptor and PublishHidServDescriptors.
  24646. - Also let the controller set the __AllDirActionsPrivate config
  24647. option if you want all directory fetches/publishes to happen via
  24648. Tor (it assumes your controller bootstraps your circuits).
  24649. - Add "HardwareAccel" config option: support for crypto hardware
  24650. accelerators via OpenSSL. Off by default, until we find somebody
  24651. smart who can test it for us. (It appears to produce seg faults
  24652. in at least some cases.)
  24653. - New config option "AuthDirRejectUnlisted" for directory authorities
  24654. as a panic button: if we get flooded with unusable servers we can
  24655. revert to only listing servers in the approved-routers file.
  24656. - Directory authorities can now reject/invalidate by key and IP,
  24657. with the config options "AuthDirInvalid" and "AuthDirReject", or
  24658. by marking a fingerprint as "!reject" or "!invalid" (as its
  24659. nickname) in the approved-routers file. This is useful since
  24660. currently we automatically list servers as running and usable
  24661. even if we know they're jerks.
  24662. - Add a new config option TestSocks so people can see whether their
  24663. applications are using socks4, socks4a, socks5-with-ip, or
  24664. socks5-with-fqdn. This way they don't have to keep mucking
  24665. with tcpdump and wondering if something got cached somewhere.
  24666. - Add "private:*" as an alias in configuration for policies. Now
  24667. you can simplify your exit policy rather than needing to list
  24668. every single internal or nonroutable network space.
  24669. - Accept "private:*" in routerdesc exit policies; not generated yet
  24670. because older Tors do not understand it.
  24671. - Add configuration option "V1AuthoritativeDirectory 1" which
  24672. moria1, moria2, and tor26 have set.
  24673. - Implement an option, VirtualAddrMask, to set which addresses
  24674. get handed out in response to mapaddress requests. This works
  24675. around a bug in tsocks where 127.0.0.0/8 is never socksified.
  24676. - Add a new config option FetchUselessDescriptors, off by default,
  24677. for when you plan to run "exitlist" on your client and you want
  24678. to know about even the non-running descriptors.
  24679. - SocksTimeout: How long do we let a socks connection wait
  24680. unattached before we fail it?
  24681. - CircuitBuildTimeout: Cull non-open circuits that were born
  24682. at least this many seconds ago.
  24683. - CircuitIdleTimeout: Cull open clean circuits that were born
  24684. at least this many seconds ago.
  24685. - New config option SafeSocks to reject all application connections
  24686. using unsafe socks protocols. Defaults to off.
  24687. o Improved and clearer log messages:
  24688. - Reduce clutter in server logs. We're going to try to make
  24689. them actually usable now. New config option ProtocolWarnings that
  24690. lets you hear about how _other Tors_ are breaking the protocol. Off
  24691. by default.
  24692. - Divide log messages into logging domains. Once we put some sort
  24693. of interface on this, it will let people looking at more verbose
  24694. log levels specify the topics they want to hear more about.
  24695. - Log server fingerprint on startup, so new server operators don't
  24696. have to go hunting around their filesystem for it.
  24697. - Provide dire warnings to any users who set DirServer manually;
  24698. move it out of torrc.sample and into torrc.complete.
  24699. - Make the log message less scary when all the dirservers are
  24700. temporarily unreachable.
  24701. - When tor_socketpair() fails in Windows, give a reasonable
  24702. Windows-style errno back.
  24703. - Improve tor_gettimeofday() granularity on windows.
  24704. - We were printing the number of idle dns workers incorrectly when
  24705. culling them.
  24706. - Handle duplicate lines in approved-routers files without warning.
  24707. - We were whining about using socks4 or socks5-with-local-lookup
  24708. even when it's an IP address in the "virtual" range we designed
  24709. exactly for this case.
  24710. - Check for named servers when looking them up by nickname;
  24711. warn when we're calling a non-named server by its nickname;
  24712. don't warn twice about the same name.
  24713. - Downgrade the dirserver log messages when whining about
  24714. unreachability.
  24715. - Correct "your server is reachable" log entries to indicate that
  24716. it was self-testing that told us so.
  24717. - If we're trying to be a Tor server and running Windows 95/98/ME
  24718. as a server, explain that we'll likely crash.
  24719. - Provide a more useful warn message when our onion queue gets full:
  24720. the CPU is too slow or the exit policy is too liberal.
  24721. - Don't warn when we receive a 503 from a dirserver/cache -- this
  24722. will pave the way for them being able to refuse if they're busy.
  24723. - When we fail to bind a listener, try to provide a more useful
  24724. log message: e.g., "Is Tor already running?"
  24725. - Only start testing reachability once we've established a
  24726. circuit. This will make startup on dir authorities less noisy.
  24727. - Don't try to upload hidden service descriptors until we have
  24728. established a circuit.
  24729. - Tor didn't warn when it failed to open a log file.
  24730. - Warn when listening on a public address for socks. We suspect a
  24731. lot of people are setting themselves up as open socks proxies,
  24732. and they have no idea that jerks on the Internet are using them,
  24733. since they simply proxy the traffic into the Tor network.
  24734. - Give a useful message when people run Tor as the wrong user,
  24735. rather than telling them to start chowning random directories.
  24736. - Fix a harmless bug that was causing Tor servers to log
  24737. "Got an end because of misc error, but we're not an AP. Closing."
  24738. - Fix wrong log message when you add a "HiddenServiceNodes" config
  24739. line without any HiddenServiceDir line (reported by Chris Thomas).
  24740. - Directory authorities now stop whining so loudly about bad
  24741. descriptors that they fetch from other dirservers. So when there's
  24742. a log complaint, it's for sure from a freshly uploaded descriptor.
  24743. - When logging via syslog, include the pid whenever we provide
  24744. a log entry. Suggested by Todd Fries.
  24745. - When we're shutting down and we do something like try to post a
  24746. server descriptor or rendezvous descriptor, don't complain that
  24747. we seem to be unreachable. Of course we are, we're shutting down.
  24748. - Change log line for unreachability to explicitly suggest /etc/hosts
  24749. as the culprit. Also make it clearer what IP address and ports we're
  24750. testing for reachability.
  24751. - Put quotes around user-supplied strings when logging so users are
  24752. more likely to realize if they add bad characters (like quotes)
  24753. to the torrc.
  24754. - NT service patch from Matt Edman to improve error messages on Win32.
  24755. Changes in version 0.1.0.17 - 2006-02-17
  24756. o Crash bugfixes on 0.1.0.x:
  24757. - When servers with a non-zero DirPort came out of hibernation,
  24758. sometimes they would trigger an assert.
  24759. o Other important bugfixes:
  24760. - On platforms that don't have getrlimit (like Windows), we were
  24761. artificially constraining ourselves to a max of 1024
  24762. connections. Now just assume that we can handle as many as 15000
  24763. connections. Hopefully this won't cause other problems.
  24764. o Backported features:
  24765. - When we're a server, a client asks for an old-style directory,
  24766. and our write bucket is empty, don't give it to him. This way
  24767. small servers can continue to serve the directory *sometimes*,
  24768. without getting overloaded.
  24769. - Whenever you get a 503 in response to a directory fetch, try
  24770. once more. This will become important once servers start sending
  24771. 503's whenever they feel busy.
  24772. - Fetch a new directory every 120 minutes, not every 40 minutes.
  24773. Now that we have hundreds of thousands of users running the old
  24774. directory algorithm, it's starting to hurt a lot.
  24775. - Bump up the period for forcing a hidden service descriptor upload
  24776. from 20 minutes to 1 hour.
  24777. Changes in version 0.1.0.16 - 2006-01-02
  24778. o Crash bugfixes on 0.1.0.x:
  24779. - On Windows, build with a libevent patch from "I-M Weasel" to avoid
  24780. corrupting the heap, losing FDs, or crashing when we need to resize
  24781. the fd_sets. (This affects the Win32 binaries, not Tor's sources.)
  24782. - It turns out sparc64 platforms crash on unaligned memory access
  24783. too -- so detect and avoid this.
  24784. - Handle truncated compressed data correctly (by detecting it and
  24785. giving an error).
  24786. - Fix possible-but-unlikely free(NULL) in control.c.
  24787. - When we were closing connections, there was a rare case that
  24788. stomped on memory, triggering seg faults and asserts.
  24789. - Avoid potential infinite recursion when building a descriptor. (We
  24790. don't know that it ever happened, but better to fix it anyway.)
  24791. - We were neglecting to unlink marked circuits from soon-to-close OR
  24792. connections, which caused some rare scribbling on freed memory.
  24793. - Fix a memory stomping race bug when closing the joining point of two
  24794. rendezvous circuits.
  24795. - Fix an assert in time parsing found by Steven Murdoch.
  24796. o Other bugfixes on 0.1.0.x:
  24797. - When we're doing reachability testing, provide more useful log
  24798. messages so the operator knows what to expect.
  24799. - Do not check whether DirPort is reachable when we are suppressing
  24800. advertising it because of hibernation.
  24801. - When building with -static or on Solaris, we sometimes needed -ldl.
  24802. - One of the dirservers (tor26) changed its IP address.
  24803. - When we're deciding whether a stream has enough circuits around
  24804. that can handle it, count the freshly dirty ones and not the ones
  24805. that are so dirty they won't be able to handle it.
  24806. - When we're expiring old circuits, we had a logic error that caused
  24807. us to close new rendezvous circuits rather than old ones.
  24808. - Give a more helpful log message when you try to change ORPort via
  24809. the controller: you should upgrade Tor if you want that to work.
  24810. - We were failing to parse Tor versions that start with "Tor ".
  24811. - Tolerate faulty streams better: when a stream fails for reason
  24812. exitpolicy, stop assuming that the router is lying about his exit
  24813. policy. When a stream fails for reason misc, allow it to retry just
  24814. as if it was resolvefailed. When a stream has failed three times,
  24815. reset its failure count so we can try again and get all three tries.
  24816. Changes in version 0.1.0.15 - 2005-09-23
  24817. o Bugfixes on 0.1.0.x:
  24818. - Reject ports 465 and 587 (spam targets) in default exit policy.
  24819. - Don't crash when we don't have any spare file descriptors and we
  24820. try to spawn a dns or cpu worker.
  24821. - Get rid of IgnoreVersion undocumented config option, and make us
  24822. only warn, never exit, when we're running an obsolete version.
  24823. - Don't try to print a null string when your server finds itself to
  24824. be unreachable and the Address config option is empty.
  24825. - Make the numbers in read-history and write-history into uint64s,
  24826. so they don't overflow and publish negatives in the descriptor.
  24827. - Fix a minor memory leak in smartlist_string_remove().
  24828. - We were only allowing ourselves to upload a server descriptor at
  24829. most every 20 minutes, even if it changed earlier than that.
  24830. - Clean up log entries that pointed to old URLs.
  24831. Changes in version 0.1.0.14 - 2005-08-08
  24832. o Bugfixes on 0.1.0.x:
  24833. - Fix the other half of the bug with crypto handshakes
  24834. (CVE-2005-2643).
  24835. - Fix an assert trigger if you send a 'signal term' via the
  24836. controller when it's listening for 'event info' messages.
  24837. Changes in version 0.1.0.13 - 2005-08-04
  24838. o Bugfixes on 0.1.0.x:
  24839. - Fix a critical bug in the security of our crypto handshakes.
  24840. - Fix a size_t underflow in smartlist_join_strings2() that made
  24841. it do bad things when you hand it an empty smartlist.
  24842. - Fix Windows installer to ship Tor license (thanks to Aphex for
  24843. pointing out this oversight) and put a link to the doc directory
  24844. in the start menu.
  24845. - Explicitly set no-unaligned-access for sparc: it turns out the
  24846. new gcc's let you compile broken code, but that doesn't make it
  24847. not-broken.
  24848. Changes in version 0.1.0.12 - 2005-07-18
  24849. o New directory servers:
  24850. - tor26 has changed IP address.
  24851. o Bugfixes on 0.1.0.x:
  24852. - Fix a possible double-free in tor_gzip_uncompress().
  24853. - When --disable-threads is set, do not search for or link against
  24854. pthreads libraries.
  24855. - Don't trigger an assert if an authoritative directory server
  24856. claims its dirport is 0.
  24857. - Fix bug with removing Tor as an NT service: some people were
  24858. getting "The service did not return an error." Thanks to Matt
  24859. Edman for the fix.
  24860. Changes in version 0.1.0.11 - 2005-06-30
  24861. o Bugfixes on 0.1.0.x:
  24862. - Fix major security bug: servers were disregarding their
  24863. exit policies if clients behaved unexpectedly.
  24864. - Make OS X init script check for missing argument, so we don't
  24865. confuse users who invoke it incorrectly.
  24866. - Fix a seg fault in "tor --hash-password foo".
  24867. - The MAPADDRESS control command was broken.
  24868. Changes in version 0.1.0.10 - 2005-06-14
  24869. o Fixes on Win32:
  24870. - Make NT services work and start on startup on Win32 (based on
  24871. patch by Matt Edman). See the FAQ entry for details.
  24872. - Make 'platform' string in descriptor more accurate for Win32
  24873. servers, so it's not just "unknown platform".
  24874. - REUSEADDR on normal platforms means you can rebind to the port
  24875. right after somebody else has let it go. But REUSEADDR on Win32
  24876. means you can bind to the port _even when somebody else already
  24877. has it bound_! So, don't do that on Win32.
  24878. - Clean up the log messages when starting on Win32 with no config
  24879. file.
  24880. - Allow seeding the RNG on Win32 even when you're not running as
  24881. Administrator. If seeding the RNG on Win32 fails, quit.
  24882. o Assert / crash bugs:
  24883. - Refuse relay cells that claim to have a length larger than the
  24884. maximum allowed. This prevents a potential attack that could read
  24885. arbitrary memory (e.g. keys) from an exit server's process
  24886. (CVE-2005-2050).
  24887. - If unofficial Tor clients connect and send weird TLS certs, our
  24888. Tor server triggers an assert. Stop asserting, and start handling
  24889. TLS errors better in other situations too.
  24890. - Fix a race condition that can trigger an assert when we have a
  24891. pending create cell and an OR connection attempt fails.
  24892. o Resource leaks:
  24893. - Use pthreads for worker processes rather than forking. This was
  24894. forced because when we forked, we ended up wasting a lot of
  24895. duplicate ram over time.
  24896. - Also switch to foo_r versions of some library calls to allow
  24897. reentry and threadsafeness.
  24898. - Implement --disable-threads configure option. Disable threads on
  24899. netbsd and openbsd by default, because they have no reentrant
  24900. resolver functions (!), and on solaris since it has other
  24901. threading issues.
  24902. - Fix possible bug on threading platforms (e.g. win32) which was
  24903. leaking a file descriptor whenever a cpuworker or dnsworker died.
  24904. - Fix a minor memory leak when somebody establishes an introduction
  24905. point at your Tor server.
  24906. - Fix possible memory leak in tor_lookup_hostname(). (Thanks to
  24907. Adam Langley.)
  24908. - Add ./configure --with-dmalloc option, to track memory leaks.
  24909. - And try to free all memory on closing, so we can detect what
  24910. we're leaking.
  24911. o Protocol correctness:
  24912. - When we've connected to an OR and handshaked but didn't like
  24913. the result, we were closing the conn without sending destroy
  24914. cells back for pending circuits. Now send those destroys.
  24915. - Start sending 'truncated' cells back rather than destroy cells
  24916. if the circuit closes in front of you. This means we won't have
  24917. to abandon partially built circuits.
  24918. - Handle changed router status correctly when dirserver reloads
  24919. fingerprint file. We used to be dropping all unverified descriptors
  24920. right then. The bug was hidden because we would immediately
  24921. fetch a directory from another dirserver, which would include the
  24922. descriptors we just dropped.
  24923. - Revise tor-spec to add more/better stream end reasons.
  24924. - Revise all calls to connection_edge_end to avoid sending 'misc',
  24925. and to take errno into account where possible.
  24926. - Client now retries when streams end early for 'hibernating' or
  24927. 'resource limit' reasons, rather than failing them.
  24928. - Try to be more zealous about calling connection_edge_end when
  24929. things go bad with edge conns in connection.c.
  24930. o Robustness improvements:
  24931. - Better handling for heterogeneous / unreliable nodes:
  24932. - Annotate circuits with whether they aim to contain high uptime
  24933. nodes and/or high capacity nodes. When building circuits, choose
  24934. appropriate nodes.
  24935. - This means that every single node in an intro rend circuit,
  24936. not just the last one, will have a minimum uptime.
  24937. - New config option LongLivedPorts to indicate application streams
  24938. that will want high uptime circuits.
  24939. - Servers reset uptime when a dir fetch entirely fails. This
  24940. hopefully reflects stability of the server's network connectivity.
  24941. - If somebody starts his tor server in Jan 2004 and then fixes his
  24942. clock, don't make his published uptime be a year.
  24943. - Reset published uptime when we wake up from hibernation.
  24944. - Introduce a notion of 'internal' circs, which are chosen without
  24945. regard to the exit policy of the last hop. Intro and rendezvous
  24946. circs must be internal circs, to avoid leaking information. Resolve
  24947. and connect streams can use internal circs if they want.
  24948. - New circuit pooling algorithm: keep track of what destination ports
  24949. we've used recently (start out assuming we'll want to use 80), and
  24950. make sure to have enough circs around to satisfy these ports. Also
  24951. make sure to have 2 internal circs around if we've required internal
  24952. circs lately (and with high uptime if we've seen that lately too).
  24953. - Turn addr_policy_compare from a tristate to a quadstate; this should
  24954. help address our "Ah, you allow 1.2.3.4:80. You are a good choice
  24955. for google.com" problem.
  24956. - When a client asks us for a dir mirror and we don't have one,
  24957. launch an attempt to get a fresh one.
  24958. - First cut at support for "create-fast" cells. Clients can use
  24959. these when extending to their first hop, since the TLS already
  24960. provides forward secrecy and authentication. Not enabled on
  24961. clients yet.
  24962. o Reachability testing.
  24963. - Your Tor server will automatically try to see if its ORPort and
  24964. DirPort are reachable from the outside, and it won't upload its
  24965. descriptor until it decides at least ORPort is reachable (when
  24966. DirPort is not yet found reachable, publish it as zero).
  24967. - When building testing circs for ORPort testing, use only
  24968. high-bandwidth nodes, so fewer circuits fail.
  24969. - Notice when our IP changes, and reset stats/uptime/reachability.
  24970. - Authdirservers don't do ORPort reachability detection, since
  24971. they're in clique mode, so it will be rare to find a server not
  24972. already connected to them.
  24973. - Authdirservers now automatically approve nodes running 0.1.0.2-rc
  24974. or later.
  24975. o Dirserver fixes:
  24976. - Now we allow two unverified servers with the same nickname
  24977. but different keys. But if a nickname is verified, only that
  24978. nickname+key are allowed.
  24979. - If you're an authdirserver connecting to an address:port,
  24980. and it's not the OR you were expecting, forget about that
  24981. descriptor. If he *was* the one you were expecting, then forget
  24982. about all other descriptors for that address:port.
  24983. - Allow servers to publish descriptors from 12 hours in the future.
  24984. Corollary: only whine about clock skew from the dirserver if
  24985. he's a trusted dirserver (since now even verified servers could
  24986. have quite wrong clocks).
  24987. - Require servers that use the default dirservers to have public IP
  24988. addresses. We have too many servers that are configured with private
  24989. IPs and their admins never notice the log entries complaining that
  24990. their descriptors are being rejected.
  24991. o Efficiency improvements:
  24992. - Use libevent. Now we can use faster async cores (like epoll, kpoll,
  24993. and /dev/poll), and hopefully work better on Windows too.
  24994. - Apple's OS X 10.4.0 ships with a broken kqueue API, and using
  24995. kqueue on 10.3.9 causes kernel panics. Don't use kqueue on OS X.
  24996. - Find libevent even if it's hiding in /usr/local/ and your
  24997. CFLAGS and LDFLAGS don't tell you to look there.
  24998. - Be able to link with libevent as a shared library (the default
  24999. after 1.0d), even if it's hiding in /usr/local/lib and even
  25000. if you haven't added /usr/local/lib to your /etc/ld.so.conf,
  25001. assuming you're running gcc. Otherwise fail and give a useful
  25002. error message.
  25003. - Switch to a new buffer management algorithm, which tries to avoid
  25004. reallocing and copying quite as much. In first tests it looks like
  25005. it uses *more* memory on average, but less cpu.
  25006. - Switch our internal buffers implementation to use a ring buffer,
  25007. to hopefully improve performance for fast servers a lot.
  25008. - Reenable the part of the code that tries to flush as soon as an
  25009. OR outbuf has a full TLS record available. Perhaps this will make
  25010. OR outbufs not grow as huge except in rare cases, thus saving lots
  25011. of CPU time plus memory.
  25012. - Improve performance for dirservers: stop re-parsing the whole
  25013. directory every time you regenerate it.
  25014. - Keep a big splay tree of (circid,orconn)->circuit mappings to make
  25015. it much faster to look up a circuit for each relay cell.
  25016. - Remove most calls to assert_all_pending_dns_resolves_ok(),
  25017. since they're eating our cpu on exit nodes.
  25018. - Stop wasting time doing a case insensitive comparison for every
  25019. dns name every time we do any lookup. Canonicalize the names to
  25020. lowercase when you first see them.
  25021. o Hidden services:
  25022. - Handle unavailable hidden services better. Handle slow or busy
  25023. hidden services better.
  25024. - Cannibalize GENERAL circs to be C_REND, C_INTRO, S_INTRO, and S_REND
  25025. circ as necessary, if there are any completed ones lying around
  25026. when we try to launch one.
  25027. - Make hidden services try to establish a rendezvous for 30 seconds
  25028. after fetching the descriptor, rather than for n (where n=3)
  25029. attempts to build a circuit.
  25030. - Adjust maximum skew and age for rendezvous descriptors: let skew
  25031. be 48 hours rather than 90 minutes.
  25032. - Reject malformed .onion addresses rather then passing them on as
  25033. normal web requests.
  25034. o Controller:
  25035. - More Tor controller support. See
  25036. http://tor.eff.org/doc/control-spec.txt for all the new features,
  25037. including signals to emulate unix signals from any platform;
  25038. redirectstream; extendcircuit; mapaddress; getinfo; postdescriptor;
  25039. closestream; closecircuit; etc.
  25040. - Encode hashed controller passwords in hex instead of base64,
  25041. to make it easier to write controllers.
  25042. - Revise control spec and implementation to allow all log messages to
  25043. be sent to controller with their severities intact (suggested by
  25044. Matt Edman). Disable debug-level logs while delivering a debug-level
  25045. log to the controller, to prevent loop. Update TorControl to handle
  25046. new log event types.
  25047. o New config options/defaults:
  25048. - Begin scrubbing sensitive strings from logs by default. Turn off
  25049. the config option SafeLogging if you need to do debugging.
  25050. - New exit policy: accept most low-numbered ports, rather than
  25051. rejecting most low-numbered ports.
  25052. - Put a note in the torrc about abuse potential with the default
  25053. exit policy.
  25054. - Add support for CONNECTing through https proxies, with "HttpsProxy"
  25055. config option.
  25056. - Add HttpProxyAuthenticator and HttpsProxyAuthenticator support
  25057. based on patch from Adam Langley (basic auth only).
  25058. - Bump the default BandwidthRate from 1 MB to 2 MB, to accommodate
  25059. the fast servers that have been joining lately. (Clients are now
  25060. willing to load balance over up to 2 MB of advertised bandwidth
  25061. capacity too.)
  25062. - New config option MaxAdvertisedBandwidth which lets you advertise
  25063. a low bandwidthrate (to not attract as many circuits) while still
  25064. allowing a higher bandwidthrate in reality.
  25065. - Require BandwidthRate to be at least 20kB/s for servers.
  25066. - Add a NoPublish config option, so you can be a server (e.g. for
  25067. testing running Tor servers in other Tor networks) without
  25068. publishing your descriptor to the primary dirservers.
  25069. - Add a new AddressMap config directive to rewrite incoming socks
  25070. addresses. This lets you, for example, declare an implicit
  25071. required exit node for certain sites.
  25072. - Add a new TrackHostExits config directive to trigger addressmaps
  25073. for certain incoming socks addresses -- for sites that break when
  25074. your exit keeps changing (based on patch from Mike Perry).
  25075. - Split NewCircuitPeriod option into NewCircuitPeriod (30 secs),
  25076. which describes how often we retry making new circuits if current
  25077. ones are dirty, and MaxCircuitDirtiness (10 mins), which describes
  25078. how long we're willing to make use of an already-dirty circuit.
  25079. - Change compiled-in SHUTDOWN_WAIT_LENGTH from a fixed 30 secs to
  25080. a config option "ShutdownWaitLength" (when using kill -INT on
  25081. servers).
  25082. - Fix an edge case in parsing config options: if they say "--"
  25083. on the commandline, it's not a config option (thanks weasel).
  25084. - New config option DirAllowPrivateAddresses for authdirservers.
  25085. Now by default they refuse router descriptors that have non-IP or
  25086. private-IP addresses.
  25087. - Change DirFetchPeriod/StatusFetchPeriod to have a special "Be
  25088. smart" default value: low for servers and high for clients.
  25089. - Some people were putting "Address " in their torrc, and they had
  25090. a buggy resolver that resolved " " to 0.0.0.0. Oops.
  25091. - If DataDir is ~/.tor, and that expands to /.tor, then default to
  25092. LOCALSTATEDIR/tor instead.
  25093. - Implement --verify-config command-line option to check if your torrc
  25094. is valid without actually launching Tor.
  25095. o Logging improvements:
  25096. - When dirservers refuse a server descriptor, we now log its
  25097. contactinfo, platform, and the poster's IP address.
  25098. - Only warn once per nickname from add_nickname_list_to_smartlist()
  25099. per failure, so an entrynode or exitnode choice that's down won't
  25100. yell so much.
  25101. - When we're connecting to an OR and he's got a different nickname/key
  25102. than we were expecting, only complain loudly if we're an OP or a
  25103. dirserver. Complaining loudly to the OR admins just confuses them.
  25104. - Whine at you if you're a server and you don't set your contactinfo.
  25105. - Warn when exit policy implicitly allows local addresses.
  25106. - Give a better warning when some other server advertises an
  25107. ORPort that is actually an apache running ssl.
  25108. - If we get an incredibly skewed timestamp from a dirserver mirror
  25109. that isn't a verified OR, don't warn -- it's probably him that's
  25110. wrong.
  25111. - When a dirserver causes you to give a warn, mention which dirserver
  25112. it was.
  25113. - Initialize libevent later in the startup process, so the logs are
  25114. already established by the time we start logging libevent warns.
  25115. - Use correct errno on win32 if libevent fails.
  25116. - Check and warn about known-bad/slow libevent versions.
  25117. - Stop warning about sigpipes in the logs. We're going to
  25118. pretend that getting these occasionally is normal and fine.
  25119. o New contrib scripts:
  25120. - New experimental script tor/contrib/exitlist: a simple python
  25121. script to parse directories and find Tor nodes that exit to listed
  25122. addresses/ports.
  25123. - New experimental script tor/contrib/ExerciseServer.py (needs more
  25124. work) that uses the controller interface to build circuits and
  25125. fetch pages over them. This will help us bootstrap servers that
  25126. have lots of capacity but haven't noticed it yet.
  25127. - New experimental script tor/contrib/PathDemo.py (needs more work)
  25128. that uses the controller interface to let you choose whole paths
  25129. via addresses like
  25130. "<hostname>.<path,separated by dots>.<length of path>.path"
  25131. - New contributed script "privoxy-tor-toggle" to toggle whether
  25132. Privoxy uses Tor. Seems to be configured for Debian by default.
  25133. - Have torctl.in/tor.sh.in check for location of su binary (needed
  25134. on FreeBSD)
  25135. o Misc bugfixes:
  25136. - chdir() to your datadirectory at the *end* of the daemonize process,
  25137. not the beginning. This was a problem because the first time you
  25138. run tor, if your datadir isn't there, and you have runasdaemon set
  25139. to 1, it will try to chdir to it before it tries to create it. Oops.
  25140. - Fix several double-mark-for-close bugs, e.g. where we were finding
  25141. a conn for a cell even if that conn is already marked for close.
  25142. - Stop most cases of hanging up on a socks connection without sending
  25143. the socks reject.
  25144. - Fix a bug in the RPM package: set home directory for _tor to
  25145. something more reasonable when first installing.
  25146. - Stop putting nodename in the Platform string in server descriptors.
  25147. It doesn't actually help, and it is confusing/upsetting some people.
  25148. - When using preferred entry or exit nodes, ignore whether the
  25149. circuit wants uptime or capacity. They asked for the nodes, they
  25150. get the nodes.
  25151. - Tie MAX_DIR_SIZE to MAX_BUF_SIZE, so now directory sizes won't get
  25152. artificially capped at 500kB.
  25153. - Cache local dns resolves correctly even when they're .exit
  25154. addresses.
  25155. - If we're hibernating and we get a SIGINT, exit immediately.
  25156. - tor-resolve requests were ignoring .exit if there was a working circuit
  25157. they could use instead.
  25158. - Pay more attention to the ClientOnly config option.
  25159. - Resolve OS X installer bugs: stop claiming to be 0.0.9.2 in certain
  25160. installer screens; and don't put stuff into StartupItems unless
  25161. the user asks you to.
  25162. o Misc features:
  25163. - Rewrite address "serifos.exit" to "externalIP.serifos.exit"
  25164. rather than just rejecting it.
  25165. - If our clock jumps forward by 100 seconds or more, assume something
  25166. has gone wrong with our network and abandon all not-yet-used circs.
  25167. - When an application is using socks5, give him the whole variety of
  25168. potential socks5 responses (connect refused, host unreachable, etc),
  25169. rather than just "success" or "failure".
  25170. - A more sane version numbering system. See
  25171. http://tor.eff.org/cvs/tor/doc/version-spec.txt for details.
  25172. - Change version parsing logic: a version is "obsolete" if it is not
  25173. recommended and (1) there is a newer recommended version in the
  25174. same series, or (2) there are no recommended versions in the same
  25175. series, but there are some recommended versions in a newer series.
  25176. A version is "new" if it is newer than any recommended version in
  25177. the same series.
  25178. - Report HTTP reasons to client when getting a response from directory
  25179. servers -- so you can actually know what went wrong.
  25180. - Reject odd-looking addresses at the client (e.g. addresses that
  25181. contain a colon), rather than having the server drop them because
  25182. they're malformed.
  25183. - Stop publishing socksport in the directory, since it's not
  25184. actually meant to be public. For compatibility, publish a 0 there
  25185. for now.
  25186. - Since we ship our own Privoxy on OS X, tweak it so it doesn't write
  25187. cookies to disk and doesn't log each web request to disk. (Thanks
  25188. to Brett Carrington for pointing this out.)
  25189. - Add OSX uninstall instructions. An actual uninstall script will
  25190. come later.
  25191. - Add "opt hibernating 1" to server descriptor to make it clearer
  25192. whether the server is hibernating.
  25193. Changes in version 0.0.9.10 - 2005-06-16
  25194. o Bugfixes on 0.0.9.x (backported from 0.1.0.10):
  25195. - Refuse relay cells that claim to have a length larger than the
  25196. maximum allowed. This prevents a potential attack that could read
  25197. arbitrary memory (e.g. keys) from an exit server's process
  25198. (CVE-2005-2050).
  25199. Changes in version 0.0.9.9 - 2005-04-23
  25200. o Bugfixes on 0.0.9.x:
  25201. - If unofficial Tor clients connect and send weird TLS certs, our
  25202. Tor server triggers an assert. This release contains a minimal
  25203. backport from the broader fix that we put into 0.1.0.4-rc.
  25204. Changes in version 0.0.9.8 - 2005-04-07
  25205. o Bugfixes on 0.0.9.x:
  25206. - We have a bug that I haven't found yet. Sometimes, very rarely,
  25207. cpuworkers get stuck in the 'busy' state, even though the cpuworker
  25208. thinks of itself as idle. This meant that no new circuits ever got
  25209. established. Here's a workaround to kill any cpuworker that's been
  25210. busy for more than 100 seconds.
  25211. Changes in version 0.0.9.7 - 2005-04-01
  25212. o Bugfixes on 0.0.9.x:
  25213. - Fix another race crash bug (thanks to Glenn Fink for reporting).
  25214. - Compare identity to identity, not to nickname, when extending to
  25215. a router not already in the directory. This was preventing us from
  25216. extending to unknown routers. Oops.
  25217. - Make sure to create OS X Tor user in <500 range, so we aren't
  25218. creating actual system users.
  25219. - Note where connection-that-hasn't-sent-end was marked, and fix
  25220. a few really loud instances of this harmless bug (it's fixed more
  25221. in 0.1.0.x).
  25222. Changes in version 0.0.9.6 - 2005-03-24
  25223. o Bugfixes on 0.0.9.x (crashes and asserts):
  25224. - Add new end stream reasons to maintenance branch. Fix bug where
  25225. reason (8) could trigger an assert. Prevent bug from recurring.
  25226. - Apparently win32 stat wants paths to not end with a slash.
  25227. - Fix assert triggers in assert_cpath_layer_ok(), where we were
  25228. blowing away the circuit that conn->cpath_layer points to, then
  25229. checking to see if the circ is well-formed. Backport check to make
  25230. sure we dont use the cpath on a closed connection.
  25231. - Prevent circuit_resume_edge_reading_helper() from trying to package
  25232. inbufs for marked-for-close streams.
  25233. - Don't crash on hup if your options->address has become unresolvable.
  25234. - Some systems (like OS X) sometimes accept() a connection and tell
  25235. you the remote host is 0.0.0.0:0. If this happens, due to some
  25236. other mis-features, we get confused; so refuse the conn for now.
  25237. o Bugfixes on 0.0.9.x (other):
  25238. - Fix harmless but scary "Unrecognized content encoding" warn message.
  25239. - Add new stream error reason: TORPROTOCOL reason means "you are not
  25240. speaking a version of Tor I understand; say bye-bye to your stream."
  25241. - Be willing to cache directories from up to ROUTER_MAX_AGE seconds
  25242. into the future, now that we are more tolerant of skew. This
  25243. resolves a bug where a Tor server would refuse to cache a directory
  25244. because all the directories it gets are too far in the future;
  25245. yet the Tor server never logs any complaints about clock skew.
  25246. - Mac packaging magic: make man pages useable, and do not overwrite
  25247. existing torrc files.
  25248. - Make OS X log happily to /var/log/tor/tor.log
  25249. Changes in version 0.0.9.5 - 2005-02-22
  25250. o Bugfixes on 0.0.9.x:
  25251. - Fix an assert race at exit nodes when resolve requests fail.
  25252. - Stop picking unverified dir mirrors--it only leads to misery.
  25253. - Patch from Matt Edman to make NT services work better. Service
  25254. support is still not compiled into the executable by default.
  25255. - Patch from Dmitri Bely so the Tor service runs better under
  25256. the win32 SYSTEM account.
  25257. - Make tor-resolve actually work (?) on Win32.
  25258. - Fix a sign bug when getrlimit claims to have 4+ billion
  25259. file descriptors available.
  25260. - Stop refusing to start when bandwidthburst == bandwidthrate.
  25261. - When create cells have been on the onion queue more than five
  25262. seconds, just send back a destroy and take them off the list.
  25263. Changes in version 0.0.9.4 - 2005-02-03
  25264. o Bugfixes on 0.0.9:
  25265. - Fix an assert bug that took down most of our servers: when
  25266. a server claims to have 1 GB of bandwidthburst, don't
  25267. freak out.
  25268. - Don't crash as badly if we have spawned the max allowed number
  25269. of dnsworkers, or we're out of file descriptors.
  25270. - Block more file-sharing ports in the default exit policy.
  25271. - MaxConn is now automatically set to the hard limit of max
  25272. file descriptors we're allowed (ulimit -n), minus a few for
  25273. logs, etc.
  25274. - Give a clearer message when servers need to raise their
  25275. ulimit -n when they start running out of file descriptors.
  25276. - SGI Compatibility patches from Jan Schaumann.
  25277. - Tolerate a corrupt cached directory better.
  25278. - When a dirserver hasn't approved your server, list which one.
  25279. - Go into soft hibernation after 95% of the bandwidth is used,
  25280. not 99%. This is especially important for daily hibernators who
  25281. have a small accounting max. Hopefully it will result in fewer
  25282. cut connections when the hard hibernation starts.
  25283. - Load-balance better when using servers that claim more than
  25284. 800kB/s of capacity.
  25285. - Make NT services work (experimental, only used if compiled in).
  25286. Changes in version 0.0.9.3 - 2005-01-21
  25287. o Bugfixes on 0.0.9:
  25288. - Backport the cpu use fixes from main branch, so busy servers won't
  25289. need as much processor time.
  25290. - Work better when we go offline and then come back, or when we
  25291. run Tor at boot before the network is up. We do this by
  25292. optimistically trying to fetch a new directory whenever an
  25293. application request comes in and we think we're offline -- the
  25294. human is hopefully a good measure of when the network is back.
  25295. - Backport some minimal hidserv bugfixes: keep rend circuits open as
  25296. long as you keep using them; actually publish hidserv descriptors
  25297. shortly after they change, rather than waiting 20-40 minutes.
  25298. - Enable Mac startup script by default.
  25299. - Fix duplicate dns_cancel_pending_resolve reported by Giorgos Pallas.
  25300. - When you update AllowUnverifiedNodes or FirewallPorts via the
  25301. controller's setconf feature, we were always appending, never
  25302. resetting.
  25303. - When you update HiddenServiceDir via setconf, it was screwing up
  25304. the order of reading the lines, making it fail.
  25305. - Do not rewrite a cached directory back to the cache; otherwise we
  25306. will think it is recent and not fetch a newer one on startup.
  25307. - Workaround for webservers that lie about Content-Encoding: Tor
  25308. now tries to autodetect compressed directories and compression
  25309. itself. This lets us Proxypass dir fetches through apache.
  25310. Changes in version 0.0.9.2 - 2005-01-04
  25311. o Bugfixes on 0.0.9 (crashes and asserts):
  25312. - Fix an assert on startup when the disk is full and you're logging
  25313. to a file.
  25314. - If you do socks4 with an IP of 0.0.0.x but *don't* provide a socks4a
  25315. style address, then we'd crash.
  25316. - Fix an assert trigger when the running-routers string we get from
  25317. a dirserver is broken.
  25318. - Make worker threads start and run on win32. Now win32 servers
  25319. may work better.
  25320. - Bandaid (not actually fix, but now it doesn't crash) an assert
  25321. where the dns worker dies mysteriously and the main Tor process
  25322. doesn't remember anything about the address it was resolving.
  25323. o Bugfixes on 0.0.9 (Win32):
  25324. - Workaround for brain-damaged __FILE__ handling on MSVC: keep Nick's
  25325. name out of the warning/assert messages.
  25326. - Fix a superficial "unhandled error on read" bug on win32.
  25327. - The win32 installer no longer requires a click-through for our
  25328. license, since our Free Software license grants rights but does not
  25329. take any away.
  25330. - Win32: When connecting to a dirserver fails, try another one
  25331. immediately. (This was already working for non-win32 Tors.)
  25332. - Stop trying to parse $HOME on win32 when hunting for default
  25333. DataDirectory.
  25334. - Make tor-resolve.c work on win32 by calling network_init().
  25335. o Bugfixes on 0.0.9 (other):
  25336. - Make 0.0.9.x build on Solaris again.
  25337. - Due to a fencepost error, we were blowing away the \n when reporting
  25338. confvalue items in the controller. So asking for multiple config
  25339. values at once couldn't work.
  25340. - When listing circuits that are pending on an opening OR connection,
  25341. if we're an OR we were listing circuits that *end* at us as
  25342. being pending on every listener, dns/cpu worker, etc. Stop that.
  25343. - Dirservers were failing to create 'running-routers' or 'directory'
  25344. strings if we had more than some threshold of routers. Fix them so
  25345. they can handle any number of routers.
  25346. - Fix a superficial "Duplicate mark for close" bug.
  25347. - Stop checking for clock skew for OR connections, even for servers.
  25348. - Fix a fencepost error that was chopping off the last letter of any
  25349. nickname that is the maximum allowed nickname length.
  25350. - Update URLs in log messages so they point to the new website.
  25351. - Fix a potential problem in mangling server private keys while
  25352. writing to disk (not triggered yet, as far as we know).
  25353. - Include the licenses for other free software we include in Tor,
  25354. now that we're shipping binary distributions more regularly.
  25355. Changes in version 0.0.9.1 - 2004-12-15
  25356. o Bugfixes on 0.0.9:
  25357. - Make hibernation actually work.
  25358. - Make HashedControlPassword config option work.
  25359. - When we're reporting event circuit status to a controller,
  25360. don't use the stream status code.
  25361. Changes in version 0.0.9 - 2004-12-12
  25362. o Bugfixes on 0.0.8.1 (Crashes and asserts):
  25363. - Catch and ignore SIGXFSZ signals when log files exceed 2GB; our
  25364. write() call will fail and we handle it there.
  25365. - When we run out of disk space, or other log writing error, don't
  25366. crash. Just stop logging to that log and continue.
  25367. - Fix isspace() and friends so they still make Solaris happy
  25368. but also so they don't trigger asserts on win32.
  25369. - Fix assert failure on malformed socks4a requests.
  25370. - Fix an assert bug where a hidden service provider would fail if
  25371. the first hop of his rendezvous circuit was down.
  25372. - Better handling of size_t vs int, so we're more robust on 64
  25373. bit platforms.
  25374. o Bugfixes on 0.0.8.1 (Win32):
  25375. - Make windows sockets actually non-blocking (oops), and handle
  25376. win32 socket errors better.
  25377. - Fix parse_iso_time on platforms without strptime (eg win32).
  25378. - win32: when being multithreaded, leave parent fdarray open.
  25379. - Better handling of winsock includes on non-MSV win32 compilers.
  25380. - Change our file IO stuff (especially wrt OpenSSL) so win32 is
  25381. happier.
  25382. - Make unit tests work on win32.
  25383. o Bugfixes on 0.0.8.1 (Path selection and streams):
  25384. - Calculate timeout for waiting for a connected cell from the time
  25385. we sent the begin cell, not from the time the stream started. If
  25386. it took a long time to establish the circuit, we would time out
  25387. right after sending the begin cell.
  25388. - Fix router_compare_addr_to_addr_policy: it was not treating a port
  25389. of * as always matching, so we were picking reject *:* nodes as
  25390. exit nodes too. Oops.
  25391. - When read() failed on a stream, we would close it without sending
  25392. back an end. So 'connection refused' would simply be ignored and
  25393. the user would get no response.
  25394. - Stop a sigpipe: when an 'end' cell races with eof from the app,
  25395. we shouldn't hold-open-until-flush if the eof arrived first.
  25396. - Let resolve conns retry/expire also, rather than sticking around
  25397. forever.
  25398. - Fix more dns related bugs: send back resolve_failed and end cells
  25399. more reliably when the resolve fails, rather than closing the
  25400. circuit and then trying to send the cell. Also attach dummy resolve
  25401. connections to a circuit *before* calling dns_resolve(), to fix
  25402. a bug where cached answers would never be sent in RESOLVED cells.
  25403. o Bugfixes on 0.0.8.1 (Circuits):
  25404. - Finally fix a bug that's been plaguing us for a year:
  25405. With high load, circuit package window was reaching 0. Whenever
  25406. we got a circuit-level sendme, we were reading a lot on each
  25407. socket, but only writing out a bit. So we would eventually reach
  25408. eof. This would be noticed and acted on even when there were still
  25409. bytes sitting in the inbuf.
  25410. - Use identity comparison, not nickname comparison, to choose which
  25411. half of circuit-ID-space each side gets to use. This is needed
  25412. because sometimes we think of a router as a nickname, and sometimes
  25413. as a hex ID, and we can't predict what the other side will do.
  25414. o Bugfixes on 0.0.8.1 (Other):
  25415. - Fix a whole slew of memory leaks.
  25416. - Disallow NDEBUG. We don't ever want anybody to turn off debug.
  25417. - If we are using select, make sure we stay within FD_SETSIZE.
  25418. - When poll() is interrupted, we shouldn't believe the revents values.
  25419. - Add a FAST_SMARTLIST define to optionally inline smartlist_get
  25420. and smartlist_len, which are two major profiling offenders.
  25421. - If do_hup fails, actually notice.
  25422. - Flush the log file descriptor after we print "Tor opening log file",
  25423. so we don't see those messages days later.
  25424. - Hidden service operators now correctly handle version 1 style
  25425. INTRODUCE1 cells (nobody generates them still, so not a critical
  25426. bug).
  25427. - Handle more errnos from accept() without closing the listener.
  25428. Some OpenBSD machines were closing their listeners because
  25429. they ran out of file descriptors.
  25430. - Some people had wrapped their tor client/server in a script
  25431. that would restart it whenever it died. This did not play well
  25432. with our "shut down if your version is obsolete" code. Now people
  25433. don't fetch a new directory if their local cached version is
  25434. recent enough.
  25435. - Make our autogen.sh work on ksh as well as bash.
  25436. - Better torrc example lines for dirbindaddress and orbindaddress.
  25437. - Improved bounds checking on parsed ints (e.g. config options and
  25438. the ones we find in directories.)
  25439. - Stop using separate defaults for no-config-file and
  25440. empty-config-file. Now you have to explicitly turn off SocksPort,
  25441. if you don't want it open.
  25442. - We were starting to daemonize before we opened our logs, so if
  25443. there were any problems opening logs, we would complain to stderr,
  25444. which wouldn't work, and then mysteriously exit.
  25445. - If a verified OR connects to us before he's uploaded his descriptor,
  25446. or we verify him and hup but he still has the original TLS
  25447. connection, then conn->nickname is still set like he's unverified.
  25448. o Code security improvements, inspired by Ilja:
  25449. - tor_snprintf wrapper over snprintf with consistent (though not C99)
  25450. overflow behavior.
  25451. - Replace sprintf with tor_snprintf. (I think they were all safe, but
  25452. hey.)
  25453. - Replace strcpy/strncpy with strlcpy in more places.
  25454. - Avoid strcat; use tor_snprintf or strlcat instead.
  25455. o Features (circuits and streams):
  25456. - New circuit building strategy: keep a list of ports that we've
  25457. used in the past 6 hours, and always try to have 2 circuits open
  25458. or on the way that will handle each such port. Seed us with port
  25459. 80 so web users won't complain that Tor is "slow to start up".
  25460. - Make kill -USR1 dump more useful stats about circuits.
  25461. - When warning about retrying or giving up, print the address, so
  25462. the user knows which one it's talking about.
  25463. - If you haven't used a clean circuit in an hour, throw it away,
  25464. just to be on the safe side. (This means after 6 hours a totally
  25465. unused Tor client will have no circuits open.)
  25466. - Support "foo.nickname.exit" addresses, to let Alice request the
  25467. address "foo" as viewed by exit node "nickname". Based on a patch
  25468. from Geoff Goodell.
  25469. - If your requested entry or exit node has advertised bandwidth 0,
  25470. pick it anyway.
  25471. - Be more greedy about filling up relay cells -- we try reading again
  25472. once we've processed the stuff we read, in case enough has arrived
  25473. to fill the last cell completely.
  25474. - Refuse application socks connections to port 0.
  25475. - Use only 0.0.9pre1 and later servers for resolve cells.
  25476. o Features (bandwidth):
  25477. - Hibernation: New config option "AccountingMax" lets you
  25478. set how many bytes per month (in each direction) you want to
  25479. allow your server to consume. Rather than spreading those
  25480. bytes out evenly over the month, we instead hibernate for some
  25481. of the month and pop up at a deterministic time, work until
  25482. the bytes are consumed, then hibernate again. Config option
  25483. "MonthlyAccountingStart" lets you specify which day of the month
  25484. your billing cycle starts on.
  25485. - Implement weekly/monthly/daily accounting: now you specify your
  25486. hibernation properties by
  25487. AccountingMax N bytes|KB|MB|GB|TB
  25488. AccountingStart day|week|month [day] HH:MM
  25489. Defaults to "month 1 0:00".
  25490. - Let bandwidth and interval config options be specified as 5 bytes,
  25491. kb, kilobytes, etc; and as seconds, minutes, hours, days, weeks.
  25492. o Features (directories):
  25493. - New "router-status" line in directory, to better bind each verified
  25494. nickname to its identity key.
  25495. - Clients can ask dirservers for /dir.z to get a compressed version
  25496. of the directory. Only works for servers running 0.0.9, of course.
  25497. - Make clients cache directories and use them to seed their router
  25498. lists at startup. This means clients have a datadir again.
  25499. - Respond to content-encoding headers by trying to uncompress as
  25500. appropriate.
  25501. - Clients and servers now fetch running-routers; cache
  25502. running-routers; compress running-routers; serve compressed
  25503. running-routers.z
  25504. - Make moria2 advertise a dirport of 80, so people behind firewalls
  25505. will be able to get a directory.
  25506. - Http proxy support
  25507. - Dirservers translate requests for http://%s:%d/x to /x
  25508. - You can specify "HttpProxy %s[:%d]" and all dir fetches will
  25509. be routed through this host.
  25510. - Clients ask for /tor/x rather than /x for new enough dirservers.
  25511. This way we can one day coexist peacefully with apache.
  25512. - Clients specify a "Host: %s%d" http header, to be compatible
  25513. with more proxies, and so running squid on an exit node can work.
  25514. - Protect dirservers from overzealous descriptor uploading -- wait
  25515. 10 seconds after directory gets dirty, before regenerating.
  25516. o Features (packages and install):
  25517. - Add NSI installer contributed by J Doe.
  25518. - Apply NT service patch from Osamu Fujino. Still needs more work.
  25519. - Commit VC6 and VC7 workspace/project files.
  25520. - Commit a tor.spec for making RPM files, with help from jbash.
  25521. - Add contrib/torctl.in contributed by Glenn Fink.
  25522. - Make expand_filename handle ~ and ~username.
  25523. - Use autoconf to enable largefile support where necessary. Use
  25524. ftello where available, since ftell can fail at 2GB.
  25525. - Ship src/win32/ in the tarball, so people can use it to build.
  25526. - Make old win32 fall back to CWD if SHGetSpecialFolderLocation
  25527. is broken.
  25528. o Features (ui controller):
  25529. - Control interface: a separate program can now talk to your
  25530. client/server over a socket, and get/set config options, receive
  25531. notifications of circuits and streams starting/finishing/dying,
  25532. bandwidth used, etc. The next step is to get some GUIs working.
  25533. Let us know if you want to help out. See doc/control-spec.txt .
  25534. - Ship a contrib/tor-control.py as an example script to interact
  25535. with the control port.
  25536. - "tor --hash-password zzyxz" will output a salted password for
  25537. use in authenticating to the control interface.
  25538. - Implement the control-spec's SAVECONF command, to write your
  25539. configuration to torrc.
  25540. - Get cookie authentication for the controller closer to working.
  25541. - When set_conf changes our server descriptor, upload a new copy.
  25542. But don't upload it too often if there are frequent changes.
  25543. o Features (config and command-line):
  25544. - Deprecate unofficial config option abbreviations, and abbreviations
  25545. not on the command line.
  25546. - Configuration infrastructure support for warning on obsolete
  25547. options.
  25548. - Give a slightly more useful output for "tor -h".
  25549. - Break DirFetchPostPeriod into:
  25550. - DirFetchPeriod for fetching full directory,
  25551. - StatusFetchPeriod for fetching running-routers,
  25552. - DirPostPeriod for posting server descriptor,
  25553. - RendPostPeriod for posting hidden service descriptors.
  25554. - New log format in config:
  25555. "Log minsev[-maxsev] stdout|stderr|syslog" or
  25556. "Log minsev[-maxsev] file /var/foo"
  25557. - DirPolicy config option, to let people reject incoming addresses
  25558. from their dirserver.
  25559. - "tor --list-fingerprint" will list your identity key fingerprint
  25560. and then exit.
  25561. - Make tor --version --version dump the cvs Id of every file.
  25562. - New 'MyFamily nick1,...' config option for a server to
  25563. specify other servers that shouldn't be used in the same circuit
  25564. with it. Only believed if nick1 also specifies us.
  25565. - New 'NodeFamily nick1,nick2,...' config option for a client to
  25566. specify nodes that it doesn't want to use in the same circuit.
  25567. - New 'Redirectexit pattern address:port' config option for a
  25568. server to redirect exit connections, e.g. to a local squid.
  25569. - Add "pass" target for RedirectExit, to make it easier to break
  25570. out of a sequence of RedirectExit rules.
  25571. - Make the dirservers file obsolete.
  25572. - Include a dir-signing-key token in directories to tell the
  25573. parsing entity which key is being used to sign.
  25574. - Remove the built-in bulky default dirservers string.
  25575. - New config option "Dirserver %s:%d [fingerprint]", which can be
  25576. repeated as many times as needed. If no dirservers specified,
  25577. default to moria1,moria2,tor26.
  25578. - Make 'Routerfile' config option obsolete.
  25579. - Discourage people from setting their dirfetchpostperiod more often
  25580. than once per minute.
  25581. o Features (other):
  25582. - kill -USR2 now moves all logs to loglevel debug (kill -HUP to
  25583. get back to normal.)
  25584. - Accept *:706 (silc) in default exit policy.
  25585. - Implement new versioning format for post 0.1.
  25586. - Distinguish between TOR_TLS_CLOSE and TOR_TLS_ERROR, so we can
  25587. log more informatively.
  25588. - Check clock skew for verified servers, but allow unverified
  25589. servers and clients to have any clock skew.
  25590. - Make sure the hidden service descriptors are at a random offset
  25591. from each other, to hinder linkability.
  25592. - Clients now generate a TLS cert too, in preparation for having
  25593. them act more like real nodes.
  25594. - Add a pure-C tor-resolve implementation.
  25595. - Use getrlimit and friends to ensure we can reach MaxConn (currently
  25596. 1024) file descriptors.
  25597. - Raise the max dns workers from 50 to 100.
  25598. Changes in version 0.0.8.1 - 2004-10-13
  25599. o Bugfixes:
  25600. - Fix a seg fault that can be triggered remotely for Tor
  25601. clients/servers with an open dirport.
  25602. - Fix a rare assert trigger, where routerinfos for entries in
  25603. our cpath would expire while we're building the path.
  25604. - Fix a bug in OutboundBindAddress so it (hopefully) works.
  25605. - Fix a rare seg fault for people running hidden services on
  25606. intermittent connections.
  25607. - Fix a bug in parsing opt keywords with objects.
  25608. - Fix a stale pointer assert bug when a stream detaches and
  25609. reattaches.
  25610. - Fix a string format vulnerability (probably not exploitable)
  25611. in reporting stats locally.
  25612. - Fix an assert trigger: sometimes launching circuits can fail
  25613. immediately, e.g. because too many circuits have failed recently.
  25614. - Fix a compile warning on 64 bit platforms.
  25615. Changes in version 0.0.8 - 2004-08-25
  25616. o Bugfixes:
  25617. - Made our unit tests compile again on OpenBSD 3.5, and tor
  25618. itself compile again on OpenBSD on a sparc64.
  25619. - We were neglecting milliseconds when logging on win32, so
  25620. everything appeared to happen at the beginning of each second.
  25621. - Check directory signature _before_ you decide whether you're
  25622. you're running an obsolete version and should exit.
  25623. - Check directory signature _before_ you parse the running-routers
  25624. list to decide who's running.
  25625. - Check return value of fclose while writing to disk, so we don't
  25626. end up with broken files when servers run out of disk space.
  25627. - Port it to SunOS 5.9 / Athena
  25628. - Fix two bugs in saving onion keys to disk when rotating, so
  25629. hopefully we'll get fewer people using old onion keys.
  25630. - Remove our mostly unused -- and broken -- hex_encode()
  25631. function. Use base16_encode() instead. (Thanks to Timo Lindfors
  25632. for pointing out this bug.)
  25633. - Only pick and establish intro points after we've gotten a
  25634. directory.
  25635. - Fix assert triggers: if the other side returns an address 0.0.0.0,
  25636. don't put it into the client dns cache.
  25637. - If a begin failed due to exit policy, but we believe the IP
  25638. address should have been allowed, switch that router to exitpolicy
  25639. reject *:* until we get our next directory.
  25640. o Protocol changes:
  25641. - 'Extend' relay cell payloads now include the digest of the
  25642. intended next hop's identity key. Now we can verify that we're
  25643. extending to the right router, and also extend to routers we
  25644. hadn't heard of before.
  25645. o Features:
  25646. - Tor nodes can now act as relays (with an advertised ORPort)
  25647. without being manually verified by the dirserver operators.
  25648. - Uploaded descriptors of unverified routers are now accepted
  25649. by the dirservers, and included in the directory.
  25650. - Verified routers are listed by nickname in the running-routers
  25651. list; unverified routers are listed as "$<fingerprint>".
  25652. - We now use hash-of-identity-key in most places rather than
  25653. nickname or addr:port, for improved security/flexibility.
  25654. - AllowUnverifiedNodes config option to let circuits choose no-name
  25655. routers in entry,middle,exit,introduction,rendezvous positions.
  25656. Allow middle and rendezvous positions by default.
  25657. - When picking unverified routers, skip those with low uptime and/or
  25658. low bandwidth, depending on what properties you care about.
  25659. - ClientOnly option for nodes that never want to become servers.
  25660. - Directory caching.
  25661. - "AuthoritativeDir 1" option for the official dirservers.
  25662. - Now other nodes (clients and servers) will cache the latest
  25663. directory they've pulled down.
  25664. - They can enable their DirPort to serve it to others.
  25665. - Clients will pull down a directory from any node with an open
  25666. DirPort, and check the signature/timestamp correctly.
  25667. - Authoritative dirservers now fetch directories from other
  25668. authdirservers, to stay better synced.
  25669. - Running-routers list tells who's down also, along with noting
  25670. if they're verified (listed by nickname) or unverified (listed
  25671. by hash-of-key).
  25672. - Allow dirservers to serve running-router list separately.
  25673. This isn't used yet.
  25674. - You can now fetch $DIRURL/running-routers to get just the
  25675. running-routers line, not the whole descriptor list. (But
  25676. clients don't use this yet.)
  25677. - Clients choose nodes proportional to advertised bandwidth.
  25678. - Clients avoid using nodes with low uptime as introduction points.
  25679. - Handle servers with dynamic IP addresses: don't just replace
  25680. options->Address with the resolved one at startup, and
  25681. detect our address right before we make a routerinfo each time.
  25682. - 'FascistFirewall' option to pick dirservers and ORs on specific
  25683. ports; plus 'FirewallPorts' config option to tell FascistFirewall
  25684. which ports are open. (Defaults to 80,443)
  25685. - Try other dirservers immediately if the one you try is down. This
  25686. should tolerate down dirservers better now.
  25687. - ORs connect-on-demand to other ORs
  25688. - If you get an extend cell to an OR you're not connected to,
  25689. connect, handshake, and forward the create cell.
  25690. - The authoritative dirservers stay connected to everybody,
  25691. and everybody stays connected to 0.0.7 servers, but otherwise
  25692. clients/servers expire unused connections after 5 minutes.
  25693. - When servers get a sigint, they delay 30 seconds (refusing new
  25694. connections) then exit. A second sigint causes immediate exit.
  25695. - File and name management:
  25696. - Look for .torrc if no CONFDIR "torrc" is found.
  25697. - If no datadir is defined, then choose, make, and secure ~/.tor
  25698. as datadir.
  25699. - If torrc not found, exitpolicy reject *:*.
  25700. - Expands ~/ in filenames to $HOME/ (but doesn't yet expand ~arma).
  25701. - If no nickname is defined, derive default from hostname.
  25702. - Rename secret key files, e.g. identity.key -> secret_id_key,
  25703. to discourage people from mailing their identity key to tor-ops.
  25704. - Refuse to build a circuit before the directory has arrived --
  25705. it won't work anyway, since you won't know the right onion keys
  25706. to use.
  25707. - Parse tor version numbers so we can do an is-newer-than check
  25708. rather than an is-in-the-list check.
  25709. - New socks command 'resolve', to let us shim gethostbyname()
  25710. locally.
  25711. - A 'tor_resolve' script to access the socks resolve functionality.
  25712. - A new socks-extensions.txt doc file to describe our
  25713. interpretation and extensions to the socks protocols.
  25714. - Add a ContactInfo option, which gets published in descriptor.
  25715. - Write tor version at the top of each log file
  25716. - New docs in the tarball:
  25717. - tor-doc.html.
  25718. - Document that you should proxy your SSL traffic too.
  25719. - Log a warning if the user uses an unsafe socks variant, so people
  25720. are more likely to learn about privoxy or socat.
  25721. - Log a warning if you're running an unverified server, to let you
  25722. know you might want to get it verified.
  25723. - Change the default exit policy to reject the default edonkey,
  25724. kazaa, gnutella ports.
  25725. - Add replace_file() to util.[ch] to handle win32's rename().
  25726. - Publish OR uptime in descriptor (and thus in directory) too.
  25727. - Remember used bandwidth (both in and out), and publish 15-minute
  25728. snapshots for the past day into our descriptor.
  25729. - Be more aggressive about trying to make circuits when the network
  25730. has changed (e.g. when you unsuspend your laptop).
  25731. - Check for time skew on http headers; report date in response to
  25732. "GET /".
  25733. - If the entrynode config line has only one node, don't pick it as
  25734. an exitnode.
  25735. - Add strict{entry|exit}nodes config options. If set to 1, then
  25736. we refuse to build circuits that don't include the specified entry
  25737. or exit nodes.
  25738. - OutboundBindAddress config option, to bind to a specific
  25739. IP address for outgoing connect()s.
  25740. - End truncated log entries (e.g. directories) with "[truncated]".
  25741. Changes in version 0.0.7.3 - 2004-08-12
  25742. o Stop dnsworkers from triggering an assert failure when you
  25743. ask them to resolve the host "".
  25744. Changes in version 0.0.7.2 - 2004-07-07
  25745. o A better fix for the 0.0.0.0 problem, that will hopefully
  25746. eliminate the remaining related assertion failures.
  25747. Changes in version 0.0.7.1 - 2004-07-04
  25748. o When an address resolves to 0.0.0.0, treat it as a failed resolve,
  25749. since internally we use 0.0.0.0 to signify "not yet resolved".
  25750. Changes in version 0.0.7 - 2004-06-07
  25751. o Fixes for crashes and other obnoxious bugs:
  25752. - Fix an epipe bug: sometimes when directory connections failed
  25753. to connect, we would give them a chance to flush before closing
  25754. them.
  25755. - When we detached from a circuit because of resolvefailed, we
  25756. would immediately try the same circuit twice more, and then
  25757. give up on the resolve thinking we'd tried three different
  25758. exit nodes.
  25759. - Limit the number of intro circuits we'll attempt to build for a
  25760. hidden service per 15-minute period.
  25761. - Check recommended-software string *early*, before actually parsing
  25762. the directory. Thus we can detect an obsolete version and exit,
  25763. even if the new directory format doesn't parse.
  25764. o Fixes for security bugs:
  25765. - Remember which nodes are dirservers when you startup, and if a
  25766. random OR enables his dirport, don't automatically assume he's
  25767. a trusted dirserver.
  25768. o Other bugfixes:
  25769. - Directory connections were asking the wrong poll socket to
  25770. start writing, and not asking themselves to start writing.
  25771. - When we detached from a circuit because we sent a begin but
  25772. didn't get a connected, we would use it again the first time;
  25773. but after that we would correctly switch to a different one.
  25774. - Stop warning when the first onion decrypt attempt fails; they
  25775. will sometimes legitimately fail now that we rotate keys.
  25776. - Override unaligned-access-ok check when $host_cpu is ia64 or
  25777. arm. Apparently they allow it but the kernel whines.
  25778. - Dirservers try to reconnect periodically too, in case connections
  25779. have failed.
  25780. - Fix some memory leaks in directory servers.
  25781. - Allow backslash in Win32 filenames.
  25782. - Made Tor build complain-free on FreeBSD, hopefully without
  25783. breaking other BSD builds. We'll see.
  25784. - Check directory signatures based on name of signer, not on whom
  25785. we got the directory from. This will let us cache directories more
  25786. easily.
  25787. - Rotate dnsworkers and cpuworkers on SIGHUP, so they get new config
  25788. settings too.
  25789. o Features:
  25790. - Doxygen markup on all functions and global variables.
  25791. - Make directory functions update routerlist, not replace it. So
  25792. now directory disagreements are not so critical a problem.
  25793. - Remove the upper limit on number of descriptors in a dirserver's
  25794. directory (not that we were anywhere close).
  25795. - Allow multiple logfiles at different severity ranges.
  25796. - Allow *BindAddress to specify ":port" rather than setting *Port
  25797. separately. Allow multiple instances of each BindAddress config
  25798. option, so you can bind to multiple interfaces if you want.
  25799. - Allow multiple exit policy lines, which are processed in order.
  25800. Now we don't need that huge line with all the commas in it.
  25801. - Enable accept/reject policies on SOCKS connections, so you can bind
  25802. to 0.0.0.0 but still control who can use your OP.
  25803. - Updated the man page to reflect these features.
  25804. Changes in version 0.0.6.2 - 2004-05-16
  25805. o Our integrity-checking digest was checking only the most recent cell,
  25806. not the previous cells like we'd thought.
  25807. Thanks to Stefan Mark for finding the flaw!
  25808. Changes in version 0.0.6.1 - 2004-05-06
  25809. o Fix two bugs in our AES counter-mode implementation (this affected
  25810. onion-level stream encryption, but not TLS-level). It turns
  25811. out we were doing something much more akin to a 16-character
  25812. polyalphabetic cipher. Oops.
  25813. Thanks to Stefan Mark for finding the flaw!
  25814. o Retire moria3 as a directory server, and add tor26 as a directory
  25815. server.
  25816. Changes in version 0.0.6 - 2004-05-02
  25817. o Features:
  25818. - Hidden services and rendezvous points are implemented. Go to
  25819. http://6sxoyfb3h2nvok2d.onion/ for an index of currently available
  25820. hidden services. (This only works via a socks4a proxy such as
  25821. Privoxy, and currently it's quite slow.)
  25822. - We now rotate link (tls context) keys and onion keys.
  25823. - CREATE cells now include oaep padding, so you can tell
  25824. if you decrypted them correctly.
  25825. - Retry stream correctly when we fail to connect because of
  25826. exit-policy-reject (should try another) or can't-resolve-address.
  25827. - When we hup a dirserver and we've *removed* a server from the
  25828. approved-routers list, now we remove that server from the
  25829. in-memory directories too.
  25830. - Add bandwidthburst to server descriptor.
  25831. - Directories now say which dirserver signed them.
  25832. - Use a tor_assert macro that logs failed assertions too.
  25833. - Since we don't support truncateds much, don't bother sending them;
  25834. just close the circ.
  25835. - Fetch randomness from /dev/urandom better (not via fopen/fread)
  25836. - Better debugging for tls errors
  25837. - Set Content-Type on the directory and hidserv descriptor.
  25838. - Remove IVs from cipher code, since AES-ctr has none.
  25839. o Bugfixes:
  25840. - Fix an assert trigger for exit nodes that's been plaguing us since
  25841. the days of 0.0.2prexx (thanks weasel!)
  25842. - Fix a bug where we were closing tls connections intermittently.
  25843. It turns out openssl keeps its errors around -- so if an error
  25844. happens, and you don't ask about it, and then another openssl
  25845. operation happens and succeeds, and you ask if there was an error,
  25846. it tells you about the first error.
  25847. - Fix a bug that's been lurking since 27 may 03 (!)
  25848. When passing back a destroy cell, we would use the wrong circ id.
  25849. - Don't crash if a conn that sent a begin has suddenly lost its circuit.
  25850. - Some versions of openssl have an SSL_pending function that erroneously
  25851. returns bytes when there is a non-application record pending.
  25852. - Win32 fixes. Tor now compiles on win32 with no warnings/errors.
  25853. o We were using an array of length zero in a few places.
  25854. o Win32's gethostbyname can't resolve an IP to an IP.
  25855. o Win32's close can't close a socket.
  25856. o Handle windows socket errors correctly.
  25857. o Portability:
  25858. - check for <sys/limits.h> so we build on FreeBSD again, and
  25859. <machine/limits.h> for NetBSD.
  25860. Changes in version 0.0.5 - 2004-03-30
  25861. o Install torrc as torrc.sample -- we no longer clobber your
  25862. torrc. (Woo!)
  25863. o Fix mangled-state bug in directory fetching (was causing sigpipes).
  25864. o Only build circuits after we've fetched the directory: clients were
  25865. using only the directory servers before they'd fetched a directory.
  25866. This also means longer startup time; so it goes.
  25867. o Fix an assert trigger where an OP would fail to handshake, and we'd
  25868. expect it to have a nickname.
  25869. o Work around a tsocks bug: do a socks reject when AP connection dies
  25870. early, else tsocks goes into an infinite loop.
  25871. o Hold socks connection open until reply is flushed (if possible)
  25872. o Make exit nodes resolve IPs to IPs immediately, rather than asking
  25873. the dns farm to do it.
  25874. o Fix c99 aliasing warnings in rephist.c
  25875. o Don't include server descriptors that are older than 24 hours in the
  25876. directory.
  25877. o Give socks 'reject' replies their whole 15s to attempt to flush,
  25878. rather than seeing the 60s timeout and assuming the flush had failed.
  25879. o Clean automake droppings from the cvs repository
  25880. o Add in a 'notice' log level for things the operator should hear
  25881. but that aren't warnings
  25882. Changes in version 0.0.4 - 2004-03-26
  25883. o When connecting to a dirserver or OR and the network is down,
  25884. we would crash.
  25885. Changes in version 0.0.3 - 2004-03-26
  25886. o Warn and fail if server chose a nickname with illegal characters
  25887. o Port to Solaris and Sparc:
  25888. - include missing header fcntl.h
  25889. - have autoconf find -lsocket -lnsl automatically
  25890. - deal with hardware word alignment
  25891. - make uname() work (solaris has a different return convention)
  25892. - switch from using signal() to sigaction()
  25893. o Preliminary work on reputation system:
  25894. - Keep statistics on success/fail of connect attempts; they're published
  25895. by kill -USR1 currently.
  25896. - Add a RunTesting option to try to learn link state by creating test
  25897. circuits, even when SocksPort is off.
  25898. - Remove unused open circuits when there are too many.
  25899. Changes in version 0.0.2 - 2004-03-19
  25900. - Include strlcpy and strlcat for safer string ops
  25901. - define INADDR_NONE so we compile (but still not run) on solaris
  25902. Changes in version 0.0.2pre27 - 2004-03-14
  25903. o Bugfixes:
  25904. - Allow internal tor networks (we were rejecting internal IPs,
  25905. now we allow them if they're set explicitly).
  25906. - And fix a few endian issues.
  25907. Changes in version 0.0.2pre26 - 2004-03-14
  25908. o New features:
  25909. - If a stream times out after 15s without a connected cell, don't
  25910. try that circuit again: try a new one.
  25911. - Retry streams at most 4 times. Then give up.
  25912. - When a dirserver gets a descriptor from an unknown router, it
  25913. logs its fingerprint (so the dirserver operator can choose to
  25914. accept it even without mail from the server operator).
  25915. - Inform unapproved servers when we reject their descriptors.
  25916. - Make tor build on Windows again. It works as a client, who knows
  25917. about as a server.
  25918. - Clearer instructions in the torrc for how to set up a server.
  25919. - Be more efficient about reading fd's when our global token bucket
  25920. (used for rate limiting) becomes empty.
  25921. o Bugfixes:
  25922. - Stop asserting that computers always go forward in time. It's
  25923. simply not true.
  25924. - When we sent a cell (e.g. destroy) and then marked an OR connection
  25925. expired, we might close it before finishing a flush if the other
  25926. side isn't reading right then.
  25927. - Don't allow dirservers to start if they haven't defined
  25928. RecommendedVersions
  25929. - We were caching transient dns failures. Oops.
  25930. - Prevent servers from publishing an internal IP as their address.
  25931. - Address a strcat vulnerability in circuit.c
  25932. Changes in version 0.0.2pre25 - 2004-03-04
  25933. o New features:
  25934. - Put the OR's IP in its router descriptor, not its fqdn. That way
  25935. we'll stop being stalled by gethostbyname for nodes with flaky dns,
  25936. e.g. poblano.
  25937. o Bugfixes:
  25938. - If the user typed in an address that didn't resolve, the server
  25939. crashed.
  25940. Changes in version 0.0.2pre24 - 2004-03-03
  25941. o Bugfixes:
  25942. - Fix an assertion failure in dns.c, where we were trying to dequeue
  25943. a pending dns resolve even if it wasn't pending
  25944. - Fix a spurious socks5 warning about still trying to write after the
  25945. connection is finished.
  25946. - Hold certain marked_for_close connections open until they're finished
  25947. flushing, rather than losing bytes by closing them too early.
  25948. - Correctly report the reason for ending a stream
  25949. - Remove some duplicate calls to connection_mark_for_close
  25950. - Put switch_id and start_daemon earlier in the boot sequence, so it
  25951. will actually try to chdir() to options.DataDirectory
  25952. - Make 'make test' exit(1) if a test fails; fix some unit tests
  25953. - Make tor fail when you use a config option it doesn't know about,
  25954. rather than warn and continue.
  25955. - Make --version work
  25956. - Bugfixes on the rpm spec file and tor.sh, so it's more up to date
  25957. Changes in version 0.0.2pre23 - 2004-02-29
  25958. o New features:
  25959. - Print a statement when the first circ is finished, so the user
  25960. knows it's working.
  25961. - If a relay cell is unrecognized at the end of the circuit,
  25962. send back a destroy. (So attacks to mutate cells are more
  25963. clearly thwarted.)
  25964. - New config option 'excludenodes' to avoid certain nodes for circuits.
  25965. - When it daemonizes, it chdir's to the DataDirectory rather than "/",
  25966. so you can collect coredumps there.
  25967. o Bugfixes:
  25968. - Fix a bug in tls flushing where sometimes data got wedged and
  25969. didn't flush until more data got sent. Hopefully this bug was
  25970. a big factor in the random delays we were seeing.
  25971. - Make 'connected' cells include the resolved IP, so the client
  25972. dns cache actually gets populated.
  25973. - Disallow changing from ORPort=0 to ORPort>0 on hup.
  25974. - When we time-out on a stream and detach from the circuit, send an
  25975. end cell down it first.
  25976. - Only warn about an unknown router (in exitnodes, entrynodes,
  25977. excludenodes) after we've fetched a directory.
  25978. Changes in version 0.0.2pre22 - 2004-02-26
  25979. o New features:
  25980. - Servers publish less revealing uname information in descriptors.
  25981. - More memory tracking and assertions, to crash more usefully when
  25982. errors happen.
  25983. - If the default torrc isn't there, just use some default defaults.
  25984. Plus provide an internal dirservers file if they don't have one.
  25985. - When the user tries to use Tor as an http proxy, give them an http
  25986. 501 failure explaining that we're a socks proxy.
  25987. - Dump a new router.desc on hup, to help confused people who change
  25988. their exit policies and then wonder why router.desc doesn't reflect
  25989. it.
  25990. - Clean up the generic tor.sh init script that we ship with.
  25991. o Bugfixes:
  25992. - If the exit stream is pending on the resolve, and a destroy arrives,
  25993. then the stream wasn't getting removed from the pending list. I
  25994. think this was the one causing recent server crashes.
  25995. - Use a more robust poll on OSX 10.3, since their poll is flaky.
  25996. - When it couldn't resolve any dirservers, it was useless from then on.
  25997. Now it reloads the RouterFile (or default dirservers) if it has no
  25998. dirservers.
  25999. - Move the 'tor' binary back to /usr/local/bin/ -- it turns out
  26000. many users don't even *have* a /usr/local/sbin/.
  26001. Changes in version 0.0.2pre21 - 2004-02-18
  26002. o New features:
  26003. - There's a ChangeLog file that actually reflects the changelog.
  26004. - There's a 'torify' wrapper script, with an accompanying
  26005. tor-tsocks.conf, that simplifies the process of using tsocks for
  26006. tor. It even has a man page.
  26007. - The tor binary gets installed to sbin rather than bin now.
  26008. - Retry streams where the connected cell hasn't arrived in 15 seconds
  26009. - Clean up exit policy handling -- get the default out of the torrc,
  26010. so we can update it without forcing each server operator to fix
  26011. his/her torrc.
  26012. - Allow imaps and pop3s in default exit policy
  26013. o Bugfixes:
  26014. - Prevent picking middleman nodes as the last node in the circuit
  26015. Changes in version 0.0.2pre20 - 2004-01-30
  26016. o New features:
  26017. - We now have a deb package, and it's in debian unstable. Go to
  26018. it, apt-getters. :)
  26019. - I've split the TotalBandwidth option into BandwidthRate (how many
  26020. bytes per second you want to allow, long-term) and
  26021. BandwidthBurst (how many bytes you will allow at once before the cap
  26022. kicks in). This better token bucket approach lets you, say, set
  26023. BandwidthRate to 10KB/s and BandwidthBurst to 10MB, allowing good
  26024. performance while not exceeding your monthly bandwidth quota.
  26025. - Push out a tls record's worth of data once you've got it, rather
  26026. than waiting until you've read everything waiting to be read. This
  26027. may improve performance by pipelining better. We'll see.
  26028. - Add an AP_CONN_STATE_CONNECTING state, to allow streams to detach
  26029. from failed circuits (if they haven't been connected yet) and attach
  26030. to new ones.
  26031. - Expire old streams that haven't managed to connect. Some day we'll
  26032. have them reattach to new circuits instead.
  26033. o Bugfixes:
  26034. - Fix several memory leaks that were causing servers to become bloated
  26035. after a while.
  26036. - Fix a few very rare assert triggers. A few more remain.
  26037. - Setuid to User _before_ complaining about running as root.
  26038. Changes in version 0.0.2pre19 - 2004-01-07
  26039. o Bugfixes:
  26040. - Fix deadlock condition in dns farm. We were telling a child to die by
  26041. closing the parent's file descriptor to him. But newer children were
  26042. inheriting the open file descriptor from the parent, and since they
  26043. weren't closing it, the socket never closed, so the child never read
  26044. eof, so he never knew to exit. Similarly, dns workers were holding
  26045. open other sockets, leading to all sorts of chaos.
  26046. - New cleaner daemon() code for forking and backgrounding.
  26047. - If you log to a file, it now prints an entry at the top of the
  26048. logfile so you know it's working.
  26049. - The onionskin challenge length was 30 bytes longer than necessary.
  26050. - Started to patch up the spec so it's not quite so out of date.
  26051. Changes in version 0.0.2pre18 - 2004-01-02
  26052. o Bugfixes:
  26053. - Fix endian issues with the 'integrity' field in the relay header.
  26054. - Fix a potential bug where connections in state
  26055. AP_CONN_STATE_CIRCUIT_WAIT might unexpectedly ask to write.
  26056. Changes in version 0.0.2pre17 - 2003-12-30
  26057. o Bugfixes:
  26058. - Made --debuglogfile (or any second log file, actually) work.
  26059. - Resolved an edge case in get_unique_circ_id_by_conn where a smart
  26060. adversary could force us into an infinite loop.
  26061. o Features:
  26062. - Each onionskin handshake now includes a hash of the computed key,
  26063. to prove the server's identity and help perfect forward secrecy.
  26064. - Changed cell size from 256 to 512 bytes (working toward compatibility
  26065. with MorphMix).
  26066. - Changed cell length to 2 bytes, and moved it to the relay header.
  26067. - Implemented end-to-end integrity checking for the payloads of
  26068. relay cells.
  26069. - Separated streamid from 'recognized' (otherwise circuits will get
  26070. messed up when we try to have streams exit from the middle). We
  26071. use the integrity-checking to confirm that a cell is addressed to
  26072. this hop.
  26073. - Randomize the initial circid and streamid values, so an adversary who
  26074. breaks into a node can't learn how many circuits or streams have
  26075. been made so far.
  26076. Changes in version 0.0.2pre16 - 2003-12-14
  26077. o Bugfixes:
  26078. - Fixed a bug that made HUP trigger an assert
  26079. - Fixed a bug where a circuit that immediately failed wasn't being
  26080. counted as a failed circuit in counting retries.
  26081. o Features:
  26082. - Now we close the circuit when we get a truncated cell: otherwise we're
  26083. open to an anonymity attack where a bad node in the path truncates
  26084. the circuit and then we open streams at him.
  26085. - Add port ranges to exit policies
  26086. - Add a conservative default exit policy
  26087. - Warn if you're running tor as root
  26088. - on HUP, retry OR connections and close/rebind listeners
  26089. - options.EntryNodes: try these nodes first when picking the first node
  26090. - options.ExitNodes: if your best choices happen to include any of
  26091. your preferred exit nodes, you choose among just those preferred
  26092. exit nodes.
  26093. - options.ExcludedNodes: nodes that are never picked in path building
  26094. Changes in version 0.0.2pre15 - 2003-12-03
  26095. o Robustness and bugfixes:
  26096. - Sometimes clients would cache incorrect DNS resolves, which would
  26097. really screw things up.
  26098. - An OP that goes offline would slowly leak all its sockets and stop
  26099. working.
  26100. - A wide variety of bugfixes in exit node selection, exit policy
  26101. handling, and processing pending streams when a new circuit is
  26102. established.
  26103. - Pick nodes for a path only from those the directory says are up
  26104. - Choose randomly from all running dirservers, not always the first one
  26105. - Increase allowed http header size for directory fetch.
  26106. - Stop writing to stderr (if we're daemonized it will be closed).
  26107. - Enable -g always, so cores will be more useful to me.
  26108. - Switch "-lcrypto -lssl" to "-lssl -lcrypto" for broken distributions.
  26109. o Documentation:
  26110. - Wrote a man page. It lists commonly used options.
  26111. o Configuration:
  26112. - Change default loglevel to warn.
  26113. - Make PidFile default to null rather than littering in your CWD.
  26114. - OnionRouter config option is now obsolete. Instead it just checks
  26115. ORPort>0.
  26116. - Moved to a single unified torrc file for both clients and servers.
  26117. Changes in version 0.0.2pre14 - 2003-11-29
  26118. o Robustness and bugfixes:
  26119. - Force the admin to make the DataDirectory himself
  26120. - to get ownership/permissions right
  26121. - so clients no longer make a DataDirectory and then never use it
  26122. - fix bug where a client who was offline for 45 minutes would never
  26123. pull down a directory again
  26124. - fix (or at least hide really well) the dns assert bug that was
  26125. causing server crashes
  26126. - warnings and improved robustness wrt clockskew for certs
  26127. - use the native daemon(3) to daemonize, when available
  26128. - exit if bind() fails
  26129. - exit if neither socksport nor orport is defined
  26130. - include our own tor_timegm (Win32 doesn't have its own)
  26131. - bugfix for win32 with lots of connections
  26132. - fix minor bias in PRNG
  26133. - make dirserver more robust to corrupt cached directory
  26134. o Documentation:
  26135. - Wrote the design document (woo)
  26136. o Circuit building and exit policies:
  26137. - Circuits no longer try to use nodes that the directory has told them
  26138. are down.
  26139. - Exit policies now support bitmasks (18.0.0.0/255.0.0.0) and
  26140. bitcounts (18.0.0.0/8).
  26141. - Make AP connections standby for a circuit if no suitable circuit
  26142. exists, rather than failing
  26143. - Circuits choose exit node based on addr/port, exit policies, and
  26144. which AP connections are standing by
  26145. - Bump min pathlen from 2 to 3
  26146. - Relay end cells have a payload to describe why the stream ended.
  26147. - If the stream failed because of exit policy, try again with a new
  26148. circuit.
  26149. - Clients have a dns cache to remember resolved addresses.
  26150. - Notice more quickly when we have no working circuits
  26151. o Configuration:
  26152. - APPort is now called SocksPort
  26153. - SocksBindAddress, ORBindAddress, DirBindAddress let you configure
  26154. where to bind
  26155. - RecommendedVersions is now a config variable rather than
  26156. hardcoded (for dirservers)
  26157. - Reloads config on HUP
  26158. - Usage info on -h or --help
  26159. - If you set User and Group config vars, it'll setu/gid to them.
  26160. Changes in version 0.0.2pre13 - 2003-10-19
  26161. o General stability:
  26162. - SSL_write no longer fails when it returns WANTWRITE and the number
  26163. of bytes in the buf has changed by the next SSL_write call.
  26164. - Fix segfault fetching directory when network is down
  26165. - Fix a variety of minor memory leaks
  26166. - Dirservers reload the fingerprints file on HUP, so I don't have
  26167. to take down the network when I approve a new router
  26168. - Default server config file has explicit Address line to specify fqdn
  26169. o Buffers:
  26170. - Buffers grow and shrink as needed (Cut process size from 20M to 2M)
  26171. - Make listener connections not ever alloc bufs
  26172. o Autoconf improvements:
  26173. - don't clobber an external CFLAGS in ./configure
  26174. - Make install now works
  26175. - create var/lib/tor on make install
  26176. - autocreate a tor.sh initscript to help distribs
  26177. - autocreate the torrc and sample-server-torrc with correct paths
  26178. o Log files and Daemonizing now work:
  26179. - If --DebugLogFile is specified, log to it at -l debug
  26180. - If --LogFile is specified, use it instead of commandline
  26181. - If --RunAsDaemon is set, tor forks and backgrounds on startup