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- This document summarizes new features and bugfixes in each stable
- release of Tor. If you want to see more detailed descriptions of the
- changes in each development snapshot, see the ChangeLog file.
- Changes in version 0.4.7.8 - 2022-06-17
- This version fixes several bugfixes including a High severity security issue
- categorized as a Denial of Service. Everyone running an earlier version
- should upgrade to this version.
- o Major bugfixes (congestion control, TROVE-2022-001):
- - Fix a scenario where RTT estimation can become wedged, seriously
- degrading congestion control performance on all circuits. This
- impacts clients, onion services, and relays, and can be triggered
- remotely by a malicious endpoint. Tracked as CVE-2022-33903. Fixes
- bug 40626; bugfix on 0.4.7.5-alpha.
- o Minor features (fallbackdir):
- - Regenerate fallback directories generated on June 17, 2022.
- o Minor features (geoip data):
- - Update the geoip files to match the IPFire Location Database, as
- retrieved on 2022/06/17.
- o Minor bugfixes (linux seccomp2 sandbox):
- - Allow the rseq system call in the sandbox. This solves a crash
- issue with glibc 2.35 on Linux. Patch from pmu-ipf. Fixes bug
- 40601; bugfix on 0.3.5.11.
- o Minor bugfixes (logging):
- - Demote a harmless warn log message about finding a second hop to
- from warn level to info level, if we do not have enough
- descriptors yet. Leave it at notice level for other cases. Fixes
- bug 40603; bugfix on 0.4.7.1-alpha.
- - Demote a notice log message about "Unexpected path length" to info
- level. These cases seem to happen arbitrarily, and we likely will
- never find all of them before the switch to arti. Fixes bug 40612;
- bugfix on 0.4.7.5-alpha.
- o Minor bugfixes (relay, logging):
- - Demote a harmless XOFF log message to from notice level to info
- level. Fixes bug 40620; bugfix on 0.4.7.5-alpha.
- Changes in version 0.4.7.7 - 2022-04-27
- This is the first stable version of the 0.4.7.x series. This series
- includes several major bugfixes from previous series and several features
- including one massive new one: congestion control.
- Congestion control, among other things, should improve traffic speed and
- stability on the network once a majority of Exit upgrade. You can find more
- details about it in proposal 324 in the torspec.git repository.
- Below are all the changes of the 0.4.7.x series:
- o Major features (congestion control):
- - Implement support for flow control over congestion controlled
- circuits. This work comes from proposal 324. Closes ticket 40450.
- o Major features (relay, client, onion services):
- - Implement RTT-based congestion control for exits and onion
- services, from Proposal 324. Disabled by default. Enabled by the
- 'cc_alg' consensus parameter. Closes ticket 40444.
- o Major features (directory authority):
- - Add a new consensus method to handle MiddleOnly specially. When
- enough authorities are using this method, then any relay tagged
- with the MiddleOnly flag will have its Exit, Guard, HSDir, and
- V2Dir flags automatically cleared, and will have its BadExit flag
- automatically set. Implements part of proposal 335.
- - Authorities can now be configured to label relays as "MiddleOnly".
- When voting for this flag, authorities automatically vote against
- Exit, Guard, HSDir, and V2Dir; and in favor of BadExit. Implements
- part of proposal 335. Based on a patch from Neel Chauhan.
- o Major features (Proposal 332, onion services, guard selection algorithm):
- - Clients and onion services now choose four long-lived "layer 2"
- guard relays for use as the middle hop in all onion circuits.
- These relays are kept in place for a randomized duration averaging
- 1 week. This mitigates guard discovery attacks against clients and
- short-lived onion services such as OnionShare. Long-lived onion
- services that need high security should still use the Vanguards
- addon (https://github.com/mikeperry-tor/vanguards). Closes ticket
- 40363; implements proposal 333.
- o Major bugfix (relay, metrics):
- - On the MetricsPort, the DNS error statistics are not reported by
- record type ("record=...") anymore due to a libevent bug
- (https://github.com/libevent/libevent/issues/1219). Fixes bug
- 40490; bugfix on 0.4.7.1-alpha.
- o Major bugfixes (bridges):
- - Make Tor work reliably again when you have multiple bridges
- configured and one or more of them are unreachable. The problem
- came because we require that we have bridge descriptors for both
- of our first two bridges (else we refuse to try to connect), but
- in some cases we would wait three hours before trying to fetch
- these missing descriptors, and/or never recover when we do try to
- fetch them. Fixes bugs 40396 and 40495; bugfix on 0.3.0.5-rc
- and 0.3.2.1-alpha.
- o Major bugfixes (client):
- - Stop caching TCP connect failures to relays/bridges when we
- initiated the connection as a client. Now we only cache connect
- failures as a relay or bridge when we initiated them because of an
- EXTEND request. Declining to re-attempt the client-based
- connections could cause problems when we lose connectivity and try
- to reconnect. Fixes bug 40499; bugfix on 0.3.3.4-alpha.
- o Major bugfixes (onion service, congestion control):
- - Fix the onion service upload case where the congestion control
- parameters were not added to the right object. Fixes bug 40586;
- bugfix on 0.4.7.4-alpha.
- o Major bugfixes (relay, DNS):
- - Lower the DNS timeout from 3 attempts at 5 seconds each to 2
- attempts at 1 seconds each. Two new consensus parameters were
- added to control these values. This change should improve observed
- performance under DNS load; see ticket for more details. Fixes bug
- 40312; bugfix on 0.3.5.1-alpha.
- o Major bugfixes (relay, overload state):
- - Relays report the general overload state for DNS timeout errors
- only if X% of all DNS queries over Y seconds are errors. Before
- that, it only took 1 timeout to report the overload state which
- was just too low of a threshold. The X and Y values are 1% and 10
- minutes respectively but they are also controlled by consensus
- parameters. Fixes bug 40491; bugfix on 0.4.6.1-alpha.
- o Major bugfixes (relay, overload):
- - Do not trigger a general overload on DNS timeout. Even after
- fixing 40527, some code remained that triggered the overload.
- Fixes bug 40564; bugfix on 0.4.7.1-alpha.
- - Change the MetricsPort DNS "timeout" label to be "tor_timeout" in
- order to indicate that this was a DNS timeout from tor perspective
- and not the DNS server itself.
- - Deprecate overload_dns_timeout_period_secs and
- overload_dns_timeout_scale_percent consensus parameters as well.
- They were used to assess the overload state which is no more now.
- - Don't make Tor DNS timeout trigger an overload general state.
- These timeouts are different from DNS server timeout. They have to
- be seen as timeout related to UX and not because of a network
- problem. Fixes bug 40527; bugfix on 0.4.6.1-alpha.
- o Minor feature (authority, relay):
- - Reject End-Of-Life relays running version 0.4.2.x, 0.4.3.x,
- 0.4.4.x and 0.4.5 alphas/rc. Closes ticket 40480.
- - Reject End-Of-Life relays running version 0.3.5.x. Closes
- ticket 40559.
- o Minor feature (onion service v2):
- - Onion service v2 addresses are now not recognized anymore by tor
- meaning a bad hostname is returned when attempting to pass it on a
- SOCKS connection. No more deprecation log is emitted client side.
- Closes ticket 40476.
- - See https://blog.torproject.org/v2-deprecation-timeline for
- details on how to transition from v2 to v3.
- o Minor feature (reproducible build):
- - The repository can now build reproducible tarballs which adds the
- build command "make dist-reprod" for that purpose. Closes
- ticket 26299.
- o Minor features (bridge testing support):
- - Let external bridge reachability testing tools discard cached
- bridge descriptors when setting new bridges, so they can be sure
- to get a clean reachability test. Implements ticket 40209.
- o Minor features (compilation):
- - Give an error message if trying to build with a version of
- LibreSSL known not to work with Tor. (There's an incompatibility
- with LibreSSL versions 3.2.1 through 3.4.0 inclusive because of
- their incompatibility with OpenSSL 1.1.1's TLSv1.3 APIs.) Closes
- ticket 40511.
- o Minor features (control port):
- - Provide congestion control fields on CIRC_BW and STREAM control
- port events, for use by sbws. Closes ticket 40568.
- o Minor features (fallbackdir):
- - Regenerate fallback directories generated on April 27, 2022.
- o Minor features (fuzzing):
- - When building with --enable-libfuzzer, use a set of compiler flags
- that works with more recent versions of the library. Previously we
- were using a set of flags from 2017. Closes ticket 40407.
- o Minor features (geoip data):
- - Update the geoip files to match the IPFire Location Database, as
- retrieved on 2022/04/27.
- o Minor features (logging, heartbeat):
- - When a relay receives a cell that isn't encrypted properly for it,
- but the relay is the last hop on the circuit, the relay now counts
- how many cells of this kind it receives, on how many circuits, and
- reports this information in the log. Previously, we'd log each
- cell at PROTOCOL_WARN level, which is far too verbose to be
- useful. Fixes part of ticket 40400.
- o Minor features (portability):
- - Try to prevent a compiler warning about printf arguments that
- could sometimes occur on MSYS2 depending on the configuration.
- Closes ticket 40355.
- o Minor features (testing configuration):
- - When TestingTorNetwork is enabled, skip the permissions check on
- hidden service directories. Closes ticket 40338.
- - On a testing network, relays can now use the
- TestingMinTimeToReportBandwidth option to change the smallest
- amount of time over which they're willing to report their observed
- maximum bandwidth. Previously, this was fixed at 1 day. For
- safety, values under 2 hours are only supported on testing
- networks. Part of a fix for ticket 40337.
- - Relays on testing networks no longer rate-limit how frequently
- they are willing to report new bandwidth measurements. Part of a
- fix for ticket 40337.
- - Relays on testing networks now report their observed bandwidths
- immediately from startup. Previously, they waited until they had
- been running for a full day. Closes ticket 40337.
- o Minor features (testing):
- - We now have separate fuzzers for the inner layers of v3 onion
- service descriptors, to prevent future bugs like 40392. Closes
- ticket 40488.
- o Minor bugfix (CI, onion service):
- - Exclude onion service version 2 Stem tests in our CI. Fixes bug
- 40500; bugfix on 0.3.2.1-alpha.
- o Minor bugfix (logging):
- - Update a log notice dead URL to a working one. Fixes bug 40544;
- bugfix on 0.3.5.1-alpha.
- o Minor bugfix (pluggable transport):
- - Do not kill a managed proxy if one of its transport configurations
- emits a method error. Instead log a warning and continue processing
- method arguments. Fixes bug 7362; bugfix on 0.2.3.6-alpha.
- o Minor bugfix (relay):
- - Remove the HSDir and HSIntro onion service v2 protocol versions so
- relay stop advertising that they support them. Fixes bug 40509;
- bugfix on 0.3.5.17.
- o Minor bugfixes (bridges):
- - When we don't yet have a descriptor for one of our bridges,
- disable the entry guard retry schedule on that bridge. The entry
- guard retry schedule and the bridge descriptor retry schedule can
- conflict, e.g. where we mark a bridge as "maybe up" yet we don't
- try to fetch its descriptor yet, leading Tor to wait (refusing to
- do anything) until it becomes time to fetch the descriptor. Fixes
- bug 40497; bugfix on 0.3.0.3-alpha.
- o Minor bugfixes (cell scheduling):
- - Avoid writing empty payload with NSS write.
- - Don't attempt to write 0 bytes after a cell scheduling loop. No
- empty payload was put on the wire. Fixes bug 40548; bugfix
- on 0.3.5.1-alpha.
- o Minor bugfixes (circuit padding):
- - Don't send STOP circuit padding cells when the other side has
- already shut down the corresponding padding machine. Fixes bug
- 40435; bugfix on 0.4.0.1-alpha.
- o Minor bugfixes (compatibility):
- - Fix compatibility with the most recent Libevent versions, which no
- longer have an evdns_set_random_bytes() function. Because this
- function has been a no-op since Libevent 2.0.4-alpha, it is safe
- for us to just stop calling it. Fixes bug 40371; bugfix
- on 0.2.1.7-alpha.
- o Minor bugfixes (compilation):
- - Fix compilation error when __NR_time is not defined. Fixes bug
- 40465; bugfix on 0.2.5.5-alpha. Patch by Daniel Pinto.
- - Fix our configuration logic to detect whether we had OpenSSL 3:
- previously, our logic was reversed. This has no other effect than
- to change whether we suppress deprecated API warnings. Fixes bug
- 40429; bugfix on 0.3.5.13.
- - Resume being able to build on old / esoteric gcc versions. Fixes
- bug 40550; bugfix on 0.4.7.1-alpha.
- o Minor bugfixes (compiler warnings):
- - Fix couple compiler warnings on latest Ubuntu Jammy. Fixes bug
- 40516; bugfix on 0.3.5.1-alpha.
- o Minor bugfixes (congestion control, client side logs):
- - Demote a warn about 1-hop circuits using congestion control down
- to info; Demote the 4-hop case to notice. Fixes bug 40598; bugfix
- on 0.4.5-alpha.
- o Minor bugfixes (control, sandbox):
- - Allows the control command SAVECONF to succeed when the seccomp
- sandbox is enabled. Makes SAVECONF keep only one backup file, to
- simplify implementation. Fixes bug 40317; bugfix on 0.2.5.4-alpha.
- Patch by Daniel Pinto.
- o Minor bugfixes (controller, path bias):
- - When a circuit's path is specified, in full or in part, from the
- controller API, do not count that circuit towards our path-bias
- calculations. (Doing so was incorrect, since we cannot tell
- whether the controller is selecting relays randomly.) Resolves a
- "Bug" warning. Fixes bug 40515; bugfix on 0.2.4.10-alpha.
- o Minor bugfixes (dirauth, bandwidth scanner):
- - Add the AuthDirDontVoteOnDirAuthBandwidth dirauth config parameter
- to avoid voting on bandwidth scanner weights to v3 directory
- authorities. Fixes bug 40471; bugfix on 0.2.2.1-alpha. Patch by
- Neel Chauhan.
- o Minor bugfixes (DNSPort, dormant mode):
- - A request on the DNSPort now wakes up a dormant tor. Fixes bug
- 40577; bugfix on 0.3.5.1-alpha.
- o Minor bugfixes (fragile-hardening, sandbox):
- - When building with --enable-fragile-hardening, add or relax Linux
- seccomp rules to allow AddressSanitizer to execute normally if the
- process terminates with the sandbox active. This has the side
- effect of disabling the filtering of file- and directory-open
- requests on most systems and dilutes the effectiveness of the
- sandbox overall, as a wider range of system calls must be
- permitted. Fixes bug 11477; bugfix on 0.2.5.4-alpha.
- o Minor bugfixes (heartbeat):
- - Adjust the heartbeat log message about distinct clients to
- consider the HeartbeatPeriod rather than a flat 6-hour delay.
- Fixes bug 40330; bugfix on 0.2.6.3-alpha.
- o Minor bugfixes (logging):
- - If a channel has never received or transmitted a cell, or seen a
- client, do not calculate time diffs against 1/1/1970 but log a
- better prettier message. Fixes bug 40182; bugfix on 0.2.4.4.
- - When we no longer have enough directory information to use the
- network, we would log a notice-level message -- but we would not
- reliably log a message when we recovered and resumed using the
- network. Now make sure there is always a corresponding message
- about recovering. Fixes bug 40496; bugfix on 0.3.5.1-alpha.
- o Minor bugfixes (logging, relay):
- - Add spaces between the "and" when logging the "Your server has not
- managed to confirm reachability for its" on dual-stack relays.
- Fixes bug 40453; bugfix on 0.4.5.1-alpha. Patch by Neel Chauhan.
- o Minor bugfixes (metrics port, onion service):
- - Fix the metrics with a port label to be unique. Before this, all
- ports of an onion service would be on the same line which violates
- the Prometheus rules of unique labels. Fixes bug 40581; bugfix
- on 0.4.5.1-alpha.
- o Minor bugfixes (onion service congestion control):
- - Avoid a non-fatal assertion failure in the case where we fail to
- set up congestion control on a rendezvous circuit. This could
- happen naturally if a cache entry expired at an unexpected time.
- Fixes bug 40576; bugfix on 0.4.7.4-alpha.
- o Minor bugfixes (onion service):
- - Do not flag an HSDir as non-running in case the descriptor upload
- or fetch fails. An onion service closes pending directory
- connections before uploading a new descriptor which leads to
- wrongly flagging many relays and thus affecting circuit path
- selection. Fixes bug 40434; bugfix on 0.2.0.13-alpha.
- - Fix a warning BUG that would occur often on heavily loaded onion
- service leading to filling the logs with useless warnings. Fixes
- bug 34083; bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (onion service, client):
- - Fix a rare but fatal assertion failure due to a guard subsystem
- recursion triggered by the onion service client. Fixes bug 40579;
- bugfix on 0.3.5.1-alpha.
- o Minor bugfixes (onion service, config):
- - Fix a memory leak for a small config line string that could occur
- if the onion service failed to be configured from file properly.
- Fixes bug 40484; bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (onion service, TROVE-2021-008):
- - Only log v2 access attempts once total, in order to not pollute
- the logs with warnings and to avoid recording the times on disk
- when v2 access was attempted. Note that the onion address was
- _never_ logged. This counts as a Low-severity security issue.
- Fixes bug 40474; bugfix on 0.4.5.8.
- - Note that due to #40476 which removes v2 support entirely, this
- log line is not emitted anymore. We still mention this in the
- changelog because it is a Low-severity TROVE.
- o Minor bugfixes (performance, DoS):
- - Fix one case of a not-especially viable denial-of-service attack
- found by OSS-Fuzz in our consensus-diff parsing code. This attack
- causes a lot small of memory allocations and then immediately
- frees them: this is only slow when running with all the sanitizers
- enabled. Fixes one case of bug 40472; bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (relay):
- - Reject IPv6-only DirPorts. Our reachability self-test forces
- DirPorts to be IPv4, but our configuration parser allowed them to
- be IPv6-only, which led to an assertion failure. Fixes bug 40494;
- bugfix on 0.4.5.1-alpha.
- o Minor bugfixes (relay, overload):
- - Decide whether to signal overload based on a fraction and
- assessment period of ntor handshake drops. Previously, a single
- drop could trigger an overload state, which caused many false
- positives. Fixes bug 40560; bugfix on 0.4.7.1-alpha.
- o Minor bugfixes (sandbox):
- - Fix the sandbox on i386 by modifying it to allow the
- "clock_gettime64" and "statx" system calls and to filter the
- "chown32" and "stat64" system calls in place of "chown" and
- "stat", respectively. Fixes bug 40505; bugfix on 0.2.5.4-alpha.
- o Minor bugfixes (statistics):
- - Fix a fencepost issue when we check stability_last_downrated where
- we called rep_hist_downrate_old_runs() twice. Fixes bug 40394;
- bugfix on 0.2.0.5-alpha. Patch by Neel Chauhan.
- o Minor bugfixes (tests):
- - Fix a bug that prevented some tests from running with the correct
- names. Fixes bug 40365; bugfix on 0.4.3.1-alpha.
- o Minor bugfixes (usability):
- - Do not log "RENDEZVOUS1 cell with unrecognized rendezvous cookie"
- at LOG_PROTOCOL_WARN; instead log it at DEBUG. This warning can
- happen naturally if a client gives up on a rendezvous circuit
- after sending INTRODUCE1. Fixes part of bug 40400; bugfix
- on 0.1.1.13-alpha.
- - Do not log "circuit_receive_relay_cell failed" at
- LOG_PROTOCOL_WARN; instead log it at DEBUG. In every case where we
- would want to log this as a protocol warning, we are already
- logging another warning from inside circuit_receive_relay_cell.
- Fixes part of bug 40400; bugfix on 0.1.1.9-alpha.
- o Code simplification and refactoring:
- - Lower the official maximum for "guard-extreme-restriction-percent"
- to 100. This has no effect on when the guard code will generate a
- warning, but it makes the intent of the option clearer. Fixes bug
- 40486; bugfix on 0.3.0.1-alpha.
- o Documentation:
- - Add links to original tor design paper and anonbib to
- docs/HACKING/README.1st.md. Closes ticket 33742. Patch from
- Emily Bones.
- - Describe the "fingerprint-ed25519" file in the tor.1 man page.
- Fixes bug 40467; bugfix on 0.4.3.1-alpha. Patch by Neel Chauhan.
- - Provide an improved version of the tor-exit-notice.html file for
- exit relays to use as a landing page. The text is unchanged, but
- the page design and layout are significantly modernized, and
- several links are fixed. Patch from "n_user"; closes ticket 40529.
- o Testing:
- - Add unit tests for the Linux seccomp sandbox. Resolves
- issue 16803.
- o Code simplification and refactoring (rust):
- - Remove Rust support and its associated code. It is unsupported and
- Rust focus should be shifted to arti. Closes ticket 40469.
- o Documentation (man, relay):
- - Missing "OverloadStatistics" in tor.1 manpage. Fixes bug 40504;
- bugfix on 0.4.6.1-alpha.
- o Testing (CI, chutney):
- - Bump the data size that chutney transmits to 5MBytes in order to
- trigger the flow control and congestion window code. Closes
- ticket 40485.
- Changes in version 0.4.6.10 - 2022-02-04
- This version contains minor bugfixes but one in particular is that relays
- don't advertise onion service v2 support at the protocol version level.
- o Minor features (fallbackdir):
- - Regenerate fallback directories generated on February 04, 2022.
- o Minor features (geoip data):
- - Update the geoip files to match the IPFire Location Database, as
- retrieved on 2022/02/04.
- o Minor bugfix (logging):
- - Update a log notice dead URL to a working one. Fixes bug 40544;
- bugfix on 0.3.5.1-alpha.
- o Minor bugfix (relay):
- - Remove the HSDir and HSIntro onion service v2 protocol versions so
- relay stop advertising that they support them. Fixes bug 40509;
- bugfix on 0.3.5.17.
- o Minor bugfixes (MetricsPort, Prometheus):
- - Add double quotes to the label values of the onion service
- metrics. Fixes bug 40552; bugfix on 0.4.5.1-alpha.
- Changes in version 0.4.6.9 - 2021-12-15
- This version fixes several bugs from earlier versions of Tor. One important
- piece is the removal of DNS timeout metric from the overload general signal.
- See below for more details.
- o Major bugfixes (relay, overload):
- - Don't make Tor DNS timeout trigger an overload general state.
- These timeouts are different from DNS server timeout. They have to
- be seen as timeout related to UX and not because of a network
- problem. Fixes bug 40527; bugfix on 0.4.6.1-alpha.
- o Minor feature (reproducible build):
- - The repository can now build reproducible tarballs which adds the
- build command "make dist-reprod" for that purpose. Closes
- ticket 26299.
- o Minor features (compilation):
- - Give an error message if trying to build with a version of
- LibreSSL known not to work with Tor. (There's an incompatibility
- with LibreSSL versions 3.2.1 through 3.4.0 inclusive because of
- their incompatibility with OpenSSL 1.1.1's TLSv1.3 APIs.) Closes
- ticket 40511.
- o Minor features (fallbackdir):
- - Regenerate fallback directories generated on December 15, 2021.
- o Minor features (geoip data):
- - Update the geoip files to match the IPFire Location Database, as
- retrieved on 2021/12/15.
- o Minor bugfixes (compilation):
- - Fix our configuration logic to detect whether we had OpenSSL 3:
- previously, our logic was reversed. This has no other effect than
- to change whether we suppress deprecated API warnings. Fixes bug
- 40429; bugfix on 0.3.5.13.
- o Minor bugfixes (relay):
- - Reject IPv6-only DirPorts. Our reachability self-test forces
- DirPorts to be IPv4, but our configuration parser allowed them to
- be IPv6-only, which led to an assertion failure. Fixes bug 40494;
- bugfix on 0.4.5.1-alpha.
- o Documentation (man, relay):
- - Missing "OverloadStatistics" in tor.1 manpage. Fixes bug 40504;
- bugfix on 0.4.6.1-alpha.
- Changes in version 0.4.6.8 - 2021-10-26
- This version fixes several bugs from earlier versions of Tor. One
- highlight is a fix on how we track DNS timeouts to report general
- relay overload.
- o Major bugfixes (relay, overload state):
- - Relays report the general overload state for DNS timeout errors
- only if X% of all DNS queries over Y seconds are errors. Before
- that, it only took 1 timeout to report the overload state which
- was just too low of a threshold. The X and Y values are 1% and 10
- minutes respectively but they are also controlled by consensus
- parameters. Fixes bug 40491; bugfix on 0.4.6.1-alpha.
- o Minor features (fallbackdir):
- - Regenerate fallback directories for October 2021. Closes
- ticket 40493.
- o Minor features (testing):
- - On a testing network, relays can now use the
- TestingMinTimeToReportBandwidth option to change the smallest
- amount of time over which they're willing to report their observed
- maximum bandwidth. Previously, this was fixed at 1 day. For
- safety, values under 2 hours are only supported on testing
- networks. Part of a fix for ticket 40337.
- - Relays on testing networks no longer rate-limit how frequently
- they are willing to report new bandwidth measurements. Part of a
- fix for ticket 40337.
- - Relays on testing networks now report their observed bandwidths
- immediately from startup. Previously, they waited until they had
- been running for a full day. Closes ticket 40337.
- o Minor bugfix (onion service):
- - Do not flag an HSDir as non-running in case the descriptor upload
- or fetch fails. An onion service closes pending directory
- connections before uploading a new descriptor which can thus lead
- to wrongly flagging many relays and thus affecting circuit building
- path selection. Fixes bug 40434; bugfix on 0.2.0.13-alpha.
- - Improve logging when a bad HS version is given. Fixes bug 40476;
- bugfix on 0.4.6.1-alpha.
- o Minor bugfix (CI, onion service):
- - Exclude onion service version 2 Stem tests in our CI. Fixes bug 40500;
- bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (compatibility):
- - Fix compatibility with the most recent Libevent versions, which no
- longer have an evdns_set_random_bytes() function. Because this
- function has been a no-op since Libevent 2.0.4-alpha, it is safe
- for us to just stop calling it. Fixes bug 40371; bugfix
- on 0.2.1.7-alpha.
- o Minor bugfixes (onion service, TROVE-2021-008):
- - Only log v2 access attempts once total, in order to not pollute
- the logs with warnings and to avoid recording the times on disk
- when v2 access was attempted. Note that the onion address was
- _never_ logged. This counts as a Low-severity security issue.
- Fixes bug 40474; bugfix on 0.4.5.8.
- Changes in version 0.4.5.11 - 2021-10-26
- The major change in this version is that v2 onion services are now
- disabled at the client, service, and relay: any Tor nodes running this
- version and onward will stop supporting v2 onion services. This is the
- last step in the long deprecation process of v2 onion services.
- Everyone running an earlier version, whether as a client, a relay, or
- an onion service, should upgrade to Tor 0.3.5.17, 0.4.5.11,
- or 0.4.6.8.
- o Major feature (onion service v2):
- - See https://blog.torproject.org/v2-deprecation-timeline for
- details on how to transition from v2 to v3.
- - The control port commands HSFETCH and HSPOST no longer allow
- version 2, and it is no longer possible to create a v2 service
- with ADD_ONION.
- - Tor no longer allows creating v2 services, or connecting as a
- client to a v2 service. Relays will decline to be a v2 HSDir or
- introduction point. This effectively disables onion service
- version 2 Tor-wide. Closes ticket 40476.
- o Minor features (bridge, backport from 0.4.6.8):
- - We now announce the URL to Tor's new bridge status at
- https://bridges.torproject.org/ when Tor is configured to run as a
- bridge relay. Closes ticket 30477.
- o Minor features (fallbackdir):
- - Regenerate fallback directories for October 2021. Closes
- ticket 40493.
- o Minor features (logging, diagnostic, backport from 0.4.6.5):
- - Log decompression failures at a higher severity level, since they
- can help provide missing context for other warning messages. We
- rate-limit these messages, to avoid flooding the logs if they
- begin to occur frequently. Closes ticket 40175.
- o Minor features (testing, backport from 0.4.6.8):
- - On a testing network, relays can now use the
- TestingMinTimeToReportBandwidth option to change the smallest
- amount of time over which they're willing to report their observed
- maximum bandwidth. Previously, this was fixed at 1 day. For
- safety, values under 2 hours are only supported on testing
- networks. Part of a fix for ticket 40337.
- - Relays on testing networks no longer rate-limit how frequently
- they are willing to report new bandwidth measurements. Part of a
- fix for ticket 40337.
- - Relays on testing networks now report their observed bandwidths
- immediately from startup. Previously, they waited until they had
- been running for a full day. Closes ticket 40337.
- o Minor bugfix (CI, onion service):
- - Exclude onion service version 2 Stem tests in our CI. Fixes bug 40500;
- bugfix on 0.3.2.1-alpha.
- o Minor bugfix (onion service, backport from 0.4.6.8):
- - Do not flag an HSDir as non-running in case the descriptor upload
- or fetch fails. An onion service closes pending directory
- connections before uploading a new descriptor which can thus lead
- to wrongly flagging many relays and thus affecting circuit building
- path selection. Fixes bug 40434; bugfix on 0.2.0.13-alpha.
- o Minor bugfixes (compatibility, backport from 0.4.6.8):
- - Fix compatibility with the most recent Libevent versions, which no
- longer have an evdns_set_random_bytes() function. Because this
- function has been a no-op since Libevent 2.0.4-alpha, it is safe
- for us to just stop calling it. Fixes bug 40371; bugfix
- on 0.2.1.7-alpha.
- o Minor bugfixes (consensus handling, backport from 0.4.6.4-rc):
- - Avoid a set of bugs that could be caused by inconsistently
- preferring an out-of-date consensus stored in a stale directory
- cache over a more recent one stored on disk as the latest
- consensus. Fixes bug 40375; bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (onion service, TROVE-2021-008, backport from 0.4.6.8):
- - Only log v2 access attempts once total, in order to not pollute
- the logs with warnings and to avoid recording the times on disk
- when v2 access was attempted. Note that the onion address was
- _never_ logged. This counts as a Low-severity security issue.
- Fixes bug 40474; bugfix on 0.4.5.8.
- Changes in version 0.3.5.17 - 2021-10-26
- The major change in this version is that v2 onion services are now
- disabled at the client, service, and relay: any Tor nodes running this
- version and onward will stop supporting v2 onion services. This is the
- last step in the long deprecation process of v2 onion services.
- Everyone running an earlier version, whether as a client, a relay, or
- an onion service, should upgrade to Tor 0.3.5.17, 0.4.5.11,
- or 0.4.6.8.
- o Major feature (onion service v2, backport from 0.4.5.11):
- - See https://blog.torproject.org/v2-deprecation-timeline for
- details on how to transition from v2 to v3.
- - The control port commands HSFETCH and HSPOST no longer allow
- version 2, and it is no longer possible to create a v2 service
- with ADD_ONION.
- - Tor no longer allows creating v2 services, or connecting as a
- client to a v2 service. Relays will decline to be a v2 HSDir or
- introduction point. This effectively disables onion service
- version 2 Tor-wide. Closes ticket 40476.
- o Minor features (bridge, backport from 0.4.6.8):
- - We now announce the URL to Tor's new bridge status at
- https://bridges.torproject.org/ when Tor is configured to run as a
- bridge relay. Closes ticket 30477.
- o Minor features (fallbackdir):
- - Regenerate fallback directories for October 2021. Closes
- ticket 40493.
- o Minor bugfixes (compatibility, backport from 0.4.6.8):
- - Fix compatibility with the most recent Libevent versions, which no
- longer have an evdns_set_random_bytes() function. Because this
- function has been a no-op since Libevent 2.0.4-alpha, it is safe
- for us to just stop calling it. Fixes bug 40371; bugfix
- on 0.2.1.7-alpha.
- Changes in version 0.4.6.7 - 2021-08-16
- This version fixes several bugs from earlier versions of Tor, including one
- that could lead to a denial-of-service attack. Everyone running an earlier
- version, whether as a client, a relay, or an onion service, should upgrade
- to Tor 0.3.5.16, 0.4.5.10, or 0.4.6.7.
- o Major bugfixes (cryptography, security):
- - Resolve an assertion failure caused by a behavior mismatch between our
- batch-signature verification code and our single-signature verification
- code. This assertion failure could be triggered remotely, leading to a
- denial of service attack. We fix this issue by disabling batch
- verification. Fixes bug 40078; bugfix on 0.2.6.1-alpha. This issue is
- also tracked as TROVE-2021-007 and CVE-2021-38385. Found by Henry de
- Valence.
- o Minor feature (fallbackdir):
- - Regenerate fallback directories list. Close ticket 40447.
- o Minor features (geoip data):
- - Update the geoip files to match the IPFire Location Database,
- as retrieved on 2021/08/12.
- o Minor bugfix (crypto):
- - Disable the unused batch verification feature of ed25519-donna. Fixes
- bug 40078; bugfix on 0.2.6.1-alpha. Found by Henry de Valence.
- o Minor bugfixes (onion service):
- - Send back the extended SOCKS error 0xF6 (Onion Service Invalid Address)
- for a v2 onion address. Fixes bug 40421; bugfix on 0.4.6.2-alpha.
- o Minor bugfix (CI, onion service):
- - Exclude onion service version 2 Stem tests in our CI. Fixes bug 40500;
- bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (relay):
- - Reduce the compression level for data streaming from HIGH to LOW in
- order to reduce CPU load on the directory relays. Fixes bug 40301;
- bugfix on 0.3.5.1-alpha.
- o Minor bugfixes (timekeeping):
- - Calculate the time of day correctly on systems where the time_t
- type includes leap seconds. (This is not the case on most
- operating systems, but on those where it occurs, our tor_timegm
- function did not correctly invert the system's gmtime function,
- which could result in assertion failures when calculating
- voting schedules.) Fixes bug 40383; bugfix on 0.2.0.3-alpha.
- Changes in version 0.4.5.10 - 2021-08-16
- This version fixes several bugs from earlier versions of Tor, including one
- that could lead to a denial-of-service attack. Everyone running an earlier
- version, whether as a client, a relay, or an onion service, should upgrade
- to Tor 0.3.5.16, 0.4.5.10, or 0.4.6.7.
- o Major bugfixes (cryptography, security):
- - Resolve an assertion failure caused by a behavior mismatch between our
- batch-signature verification code and our single-signature verification
- code. This assertion failure could be triggered remotely, leading to a
- denial of service attack. We fix this issue by disabling batch
- verification. Fixes bug 40078; bugfix on 0.2.6.1-alpha. This issue is
- also tracked as TROVE-2021-007 and CVE-2021-38385. Found by Henry de
- Valence.
- o Minor feature (fallbackdir):
- - Regenerate fallback directories list. Close ticket 40447.
- o Minor features (geoip data):
- - Update the geoip files to match the IPFire Location Database,
- as retrieved on 2021/08/12.
- o Minor features (testing):
- - Enable the deterministic RNG for unit tests that covers the address set
- bloomfilter-based API's. Fixes bug 40419; bugfix on 0.3.3.2-alpha.
- o Minor bugfix (crypto):
- - Disable the unused batch verification feature of ed25519-donna. Fixes
- bug 40078; bugfix on 0.2.6.1-alpha. Found by Henry de Valence.
- o Minor bugfixes (relay, backport from 0.4.6.x):
- - Reduce the compression level for data streaming from HIGH to LOW. Fixes
- bug 40301; bugfix on 0.3.5.1-alpha.
- o Minor bugfixes (timekeeping, backport from 0.4.6.x):
- - Calculate the time of day correctly on systems where the time_t
- type includes leap seconds. (This is not the case on most
- operating systems, but on those where it occurs, our tor_timegm
- function did not correctly invert the system's gmtime function,
- which could result in assertion failures when calculating
- voting schedules.) Fixes bug 40383; bugfix on 0.2.0.3-alpha.
- o Minor bugfixes (warnings, portability, backport from 0.4.6.x):
- - Suppress a strict-prototype warning when building with some versions
- of NSS. Fixes bug 40409; bugfix on 0.3.5.1-alpha.
- Changes in version 0.3.5.16 - 2021-08-16
- This version fixes several bugs from earlier versions of Tor, including one
- that could lead to a denial-of-service attack. Everyone running an earlier
- version, whether as a client, a relay, or an onion service, should upgrade
- to Tor 0.3.5.16, 0.4.5.10, or 0.4.6.7.
- o Major bugfixes (cryptography, security):
- - Resolve an assertion failure caused by a behavior mismatch between our
- batch-signature verification code and our single-signature verification
- code. This assertion failure could be triggered remotely, leading to a
- denial of service attack. We fix this issue by disabling batch
- verification. Fixes bug 40078; bugfix on 0.2.6.1-alpha. This issue is
- also tracked as TROVE-2021-007 and CVE-2021-38385. Found by Henry de
- Valence.
- o Minor feature (fallbackdir):
- - Regenerate fallback directories list. Close ticket 40447.
- o Minor features (geoip data):
- - Update the geoip files to match the IPFire Location Database,
- as retrieved on 2021/08/12.
- o Minor bugfix (crypto):
- - Disable the unused batch verification feature of ed25519-donna. Fixes
- bug 40078; bugfix on 0.2.6.1-alpha. Found by Henry de Valence.
- o Minor bugfixes (relay, backport from 0.4.6.x):
- - Reduce the compression level for data streaming from HIGH to LOW. Fixes
- bug 40301; bugfix on 0.3.5.1-alpha.
- Changes in version 0.4.6.6 - 2021-06-30
- Tor 0.4.6.6 makes several small fixes on 0.4.6.5, including one that
- allows Tor to build correctly on older versions of GCC. You should
- upgrade to this version if you were having trouble building Tor
- 0.4.6.5; otherwise, there is probably no need.
- o Minor bugfixes (compilation):
- - Fix a compilation error when trying to build Tor with a compiler
- that does not support const variables in static initializers.
- Fixes bug 40410; bugfix on 0.4.6.5.
- - Suppress a strict-prototype warning when building with some
- versions of NSS. Fixes bug 40409; bugfix on 0.3.5.1-alpha.
- o Minor bugfixes (testing):
- - Enable the deterministic RNG for unit tests that covers the
- address set bloomfilter-based API's. Fixes bug 40419; bugfix
- on 0.3.3.2-alpha.
- Changes in version 0.4.6.5 - 2021-06-14
- Tor 0.4.6.5 is the first stable release in its series. The 0.4.6.x
- series includes numerous features and bugfixes, including a significant
- improvement to our circuit timeout algorithm that should improve
- observed client performance, and a way for relays to report when they are
- overloaded.
- This release also includes security fixes for several security issues,
- including a denial-of-service attack against onion service clients,
- and another denial-of-service attack against relays. Everybody should
- upgrade to one of 0.3.5.15, 0.4.4.9, 0.4.5.9, or 0.4.6.5.
- Below are the changes since 0.4.5.8. For a list of changes since
- 0.4.6.4-rc, see the ChangeLog file.
- o Major bugfixes (security):
- - Don't allow relays to spoof RELAY_END or RELAY_RESOLVED cell on
- half-closed streams. Previously, clients failed to validate which
- hop sent these cells: this would allow a relay on a circuit to end
- a stream that wasn't actually built with it. Fixes bug 40389;
- bugfix on 0.3.5.1-alpha. This issue is also tracked as TROVE-2021-
- 003 and CVE-2021-34548.
- o Major bugfixes (security, defense-in-depth):
- - Detect more failure conditions from the OpenSSL RNG code.
- Previously, we would detect errors from a missing RNG
- implementation, but not failures from the RNG code itself.
- Fortunately, it appears those failures do not happen in practice
- when Tor is using OpenSSL's default RNG implementation. Fixes bug
- 40390; bugfix on 0.2.8.1-alpha. This issue is also tracked as
- TROVE-2021-004. Reported by Jann Horn at Google's Project Zero.
- o Major bugfixes (security, denial of service):
- - Resist a hashtable-based CPU denial-of-service attack against
- relays. Previously we used a naive unkeyed hash function to look
- up circuits in a circuitmux object. An attacker could exploit this
- to construct circuits with chosen circuit IDs, to create
- collisions and make the hash table inefficient. Now we use a
- SipHash construction here instead. Fixes bug 40391; bugfix on
- 0.2.4.4-alpha. This issue is also tracked as TROVE-2021-005 and
- CVE-2021-34549. Reported by Jann Horn from Google's Project Zero.
- - Fix an out-of-bounds memory access in v3 onion service descriptor
- parsing. An attacker could exploit this bug by crafting an onion
- service descriptor that would crash any client that tried to visit
- it. Fixes bug 40392; bugfix on 0.3.0.1-alpha. This issue is also
- tracked as TROVE-2021-006 and CVE-2021-34550. Reported by Sergei
- Glazunov from Google's Project Zero.
- o Major features (control port, onion services):
- - Add controller support for creating version 3 onion services with
- client authorization. Previously, only v2 onion services could be
- created with client authorization. Closes ticket 40084. Patch by
- Neel Chauhan.
- o Major features (directory authority):
- - When voting on a relay with a Sybil-like appearance, add the Sybil
- flag when clearing out the other flags. This lets a relay operator
- know why their relay hasn't been included in the consensus. Closes
- ticket 40255. Patch by Neel Chauhan.
- o Major features (metrics):
- - Relays now report how overloaded they are in their extrainfo
- documents. This information is controlled with the
- OverloadStatistics torrc option, and it will be used to improve
- decisions about the network's load balancing. Implements proposal
- 328; closes ticket 40222.
- o Major features (relay, denial of service):
- - Add a new DoS subsystem feature to control the rate of client
- connections for relays. Closes ticket 40253.
- o Major features (statistics):
- - Relays now publish statistics about the number of v3 onion
- services and volume of v3 onion service traffic, in the same
- manner they already do for v2 onions. Closes ticket 23126.
- o Major bugfixes (circuit build timeout):
- - Improve the accuracy of our circuit build timeout calculation for
- 60%, 70%, and 80% build rates for various guard choices. We now
- use a maximum likelihood estimator for Pareto parameters of the
- circuit build time distribution, instead of a "right-censored
- estimator". This causes clients to ignore circuits that never
- finish building in their timeout calculations. Previously, clients
- were counting such unfinished circuits as having the highest
- possible build time value, when in reality these circuits most
- likely just contain relays that are offline. We also now wait a
- bit longer to let circuits complete for measurement purposes,
- lower the minimum possible effective timeout from 1.5 seconds to
- 10ms, and increase the resolution of the circuit build time
- histogram from 50ms bin widths to 10ms bin widths. Additionally,
- we alter our estimate Xm by taking the maximum of the top 10 most
- common build time values of the 10ms histogram, and compute Xm as
- the average of these. Fixes bug 40168; bugfix on 0.2.2.14-alpha.
- - Remove max_time calculation and associated warning from circuit
- build timeout 'alpha' parameter estimation, as this is no longer
- needed by our new estimator from 40168. Fixes bug 34088; bugfix
- on 0.2.2.9-alpha.
- o Major bugfixes (signing key):
- - In the tor-gencert utility, give an informative error message if
- the passphrase given in `--create-identity-key` is too short.
- Fixes bug 40189; bugfix on 0.2.0.1-alpha. Patch by Neel Chauhan.
- o Minor features (bridge):
- - We now announce the URL to Tor's new bridge status at
- https://bridges.torproject.org/ when Tor is configured to run as a
- bridge relay. Closes ticket 30477.
- o Minor features (build system):
- - New "make lsp" command to auto generate the compile_commands.json
- file used by the ccls server. The "bear" program is needed for
- this. Closes ticket 40227.
- o Minor features (client):
- - Clients now check whether their streams are attempting to re-enter
- the Tor network (i.e. to send Tor traffic over Tor), and close
- them preemptively if they think exit relays will refuse them for
- this reason. See ticket 2667 for details. Closes ticket 40271.
- o Minor features (command line):
- - Add long format name "--torrc-file" equivalent to the existing
- command-line option "-f". Closes ticket 40324. Patch by
- Daniel Pinto.
- o Minor features (command-line interface):
- - Add build informations to `tor --version` in order to ease
- reproducible builds. Closes ticket 32102.
- - When parsing command-line flags that take an optional argument,
- treat the argument as absent if it would start with a '-'
- character. Arguments in that form are not intelligible for any of
- our optional-argument flags. Closes ticket 40223.
- - Allow a relay operator to list the ed25519 keys on the command
- line by adding the `rsa` and `ed25519` arguments to the
- --list-fingerprint flag to show the respective RSA and ed25519
- relay fingerprint. Closes ticket 33632. Patch by Neel Chauhan.
- o Minor features (compatibility):
- - Remove an assertion function related to TLS renegotiation. It was
- used nowhere outside the unit tests, and it was breaking
- compilation with recent alpha releases of OpenSSL 3.0.0. Closes
- ticket 40399.
- o Minor features (control port, stream handling):
- - Add the stream ID to the event line in the ADDRMAP control event.
- Closes ticket 40249. Patch by Neel Chauhan.
- o Minor features (dormant mode):
- - Add a new 'DormantTimeoutEnabled' option to allow coarse-grained
- control over whether the client ever becomes dormant from
- inactivity. Most people won't need this. Closes ticket 40228.
- - Add a new 'DormantTimeoutEnabled' option for coarse-grained
- control over whether the client can become dormant from
- inactivity. Most people won't need this. Closes ticket 40228.
- o Minor features (geoip data):
- - Update the geoip files to match the IPFire Location Database, as
- retrieved on 2021/06/10.
- o Minor features (logging):
- - Edit heartbeat log messages so that more of them begin with the
- string "Heartbeat: ". Closes ticket 40322; patch
- from 'cypherpunks'.
- - Change the DoS subsystem heartbeat line format to be more clear on
- what has been detected/rejected, and which option is disabled (if
- any). Closes ticket 40308.
- - In src/core/mainloop/mainloop.c and src/core/mainloop/connection.c,
- put brackets around IPv6 addresses in log messages. Closes ticket
- 40232. Patch by Neel Chauhan.
- o Minor features (logging, diagnostic):
- - Log decompression failures at a higher severity level, since they
- can help provide missing context for other warning messages. We
- rate-limit these messages, to avoid flooding the logs if they
- begin to occur frequently. Closes ticket 40175.
- o Minor features (onion services):
- - Add a warning message when trying to connect to (no longer
- supported) v2 onion services. Closes ticket 40373.
- o Minor features (performance, windows):
- - Use SRWLocks to implement locking on Windows. Replaces the
- "critical section" locking implementation with the faster
- SRWLocks, available since Windows Vista. Closes ticket 17927.
- Patch by Daniel Pinto.
- o Minor features (protocol, proxy support, defense in depth):
- - Close HAProxy connections if they somehow manage to send us data
- before we start reading. Closes another case of ticket 40017.
- o Minor features (tests, portability):
- - Port the hs_build_address.py test script to work with recent
- versions of python. Closes ticket 40213. Patch from
- Samanta Navarro.
- o Minor features (vote document):
- - Add a "stats" line to directory authority votes, to report various
- statistics that authorities compute about the relays. This will
- help us diagnose the network better. Closes ticket 40314.
- o Minor bugfixes (build):
- - The configure script now shows whether or not lzma and zstd have
- been used, not just if the enable flag was passed in. Fixes bug
- 40236; bugfix on 0.4.3.1-alpha.
- o Minor bugfixes (compatibility):
- - Fix a failure in the test cases when running on the "hppa"
- architecture, along with a related test that might fail on other
- architectures in the future. Fixes bug 40274; bugfix
- on 0.2.5.1-alpha.
- o Minor bugfixes (compilation):
- - Fix a compilation warning about unused functions when building
- with a libc that lacks the GLOB_ALTDIRFUNC constant. Fixes bug
- 40354; bugfix on 0.4.5.1-alpha. Patch by Daniel Pinto.
- o Minor bugfixes (consensus handling):
- - Avoid a set of bugs that could be caused by inconsistently
- preferring an out-of-date consensus stored in a stale directory
- cache over a more recent one stored on disk as the latest
- consensus. Fixes bug 40375; bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (control, sandbox):
- - Allow the control command SAVECONF to succeed when the seccomp
- sandbox is enabled, and make SAVECONF keep only one backup file to
- simplify implementation. Previously SAVECONF allowed a large
- number of backup files, which made it incompatible with the
- sandbox. Fixes bug 40317; bugfix on 0.2.5.4-alpha. Patch by
- Daniel Pinto.
- o Minor bugfixes (directory authorities, voting):
- - Add a new consensus method (31) to support any future changes that
- authorities decide to make to the value of bwweightscale or
- maxunmeasuredbw. Previously, there was a bug that prevented the
- authorities from parsing these consensus parameters correctly under
- most circumstances. Fixes bug 19011; bugfix on 0.2.2.10-alpha.
- o Minor bugfixes (ipv6):
- - Allow non-SOCKSPorts to disable IPv4, IPv6, and PreferIPv4. Some
- rare configurations might break, but in this case you can disable
- NoIPv4Traffic and NoIPv6Traffic as needed. Fixes bug 33607; bugfix
- on 0.4.1.1-alpha. Patch by Neel Chauhan.
- o Minor bugfixes (key generation):
- - Do not require a valid torrc when using the `--keygen` argument to
- generate a signing key. This allows us to generate keys on systems
- or users which may not run Tor. Fixes bug 40235; bugfix on
- 0.2.7.2-alpha. Patch by Neel Chauhan.
- o Minor bugfixes (logging, relay):
- - Emit a warning if an Address is found to be internal and tor can't
- use it. Fixes bug 40290; bugfix on 0.4.5.1-alpha.
- o Minor bugfixes (metrics port):
- - Fix a bug that made tor try to re-bind() on an already open
- MetricsPort every 60 seconds. Fixes bug 40370; bugfix
- on 0.4.5.1-alpha.
- o Minor bugfixes (onion services, logging):
- - Downgrade the severity of a few rendezvous circuit-related
- warnings from warning to info. Fixes bug 40207; bugfix on
- 0.3.2.1-alpha. Patch by Neel Chauhan.
- o Minor bugfixes (relay):
- - Reduce the compression level for data streaming from HIGH to LOW.
- This should reduce the CPU and memory burden for directory caches.
- Fixes bug 40301; bugfix on 0.3.5.1-alpha.
- o Minor bugfixes (testing, BSD):
- - Fix pattern-matching errors when patterns expand to invalid paths
- on BSD systems. Fixes bug 40318; bugfix on 0.4.5.1-alpha. Patch by
- Daniel Pinto.
- o Code simplification and refactoring:
- - Remove the orconn_ext_or_id_map structure and related functions.
- (Nothing outside of unit tests used them.) Closes ticket 33383.
- Patch by Neel Chauhan.
- o Removed features:
- - Remove unneeded code for parsing private keys in directory
- documents. This code was only used for client authentication in v2
- onion services, which are now unsupported. Closes ticket 40374.
- - As of this release, Tor no longer supports the old v2 onion
- services. They were deprecated last July for security, and support
- will be removed entirely later this year. We strongly encourage
- everybody to migrate to v3 onion services. For more information,
- see https://blog.torproject.org/v2-deprecation-timeline . Closes
- ticket 40266. (NOTE: We accidentally released an earlier version
- of the 0.4.6.1-alpha changelog without this entry. Sorry for
- the confusion!)
- o Code simplification and refactoring (metrics, DoS):
- - Move the DoS subsystem into the subsys manager, including its
- configuration options. Closes ticket 40261.
- o Documentation (manual):
- - Move the ServerTransport* options to the "SERVER OPTIONS" section.
- Closes issue 40331.
- - Indicate that the HiddenServiceStatistics option also applies to
- bridges. Closes ticket 40346.
- - Move the description of BridgeRecordUsageByCountry to the section
- "STATISTICS OPTIONS". Closes ticket 40323.
- o Removed features (relay):
- - Because DirPorts are only used on authorities, relays no longer
- advertise them. Similarly, self-testing for DirPorts has been
- disabled, since an unreachable DirPort is no reason for a relay
- not to advertise itself. (Configuring a DirPort will still work,
- for now.) Closes ticket 40282.
- Changes in version 0.4.5.9 - 2021-06-14
- Tor 0.4.5.9 fixes several security issues, including a
- denial-of-service attack against onion service clients, and another
- denial-of-service attack against relays. Everybody should upgrade to
- one of 0.3.5.15, 0.4.4.9, 0.4.5.9, or 0.4.6.5.
- o Major bugfixes (security, backport from 0.4.6.5):
- - Don't allow relays to spoof RELAY_END or RELAY_RESOLVED cell on
- half-closed streams. Previously, clients failed to validate which
- hop sent these cells: this would allow a relay on a circuit to end
- a stream that wasn't actually built with it. Fixes bug 40389;
- bugfix on 0.3.5.1-alpha. This issue is also tracked as TROVE-2021-
- 003 and CVE-2021-34548.
- o Major bugfixes (security, defense-in-depth, backport from 0.4.6.5):
- - Detect more failure conditions from the OpenSSL RNG code.
- Previously, we would detect errors from a missing RNG
- implementation, but not failures from the RNG code itself.
- Fortunately, it appears those failures do not happen in practice
- when Tor is using OpenSSL's default RNG implementation. Fixes bug
- 40390; bugfix on 0.2.8.1-alpha. This issue is also tracked as
- TROVE-2021-004. Reported by Jann Horn at Google's Project Zero.
- o Major bugfixes (security, denial of service, backport from 0.4.6.5):
- - Resist a hashtable-based CPU denial-of-service attack against
- relays. Previously we used a naive unkeyed hash function to look
- up circuits in a circuitmux object. An attacker could exploit this
- to construct circuits with chosen circuit IDs, to create
- collisions and make the hash table inefficient. Now we use a
- SipHash construction here instead. Fixes bug 40391; bugfix on
- 0.2.4.4-alpha. This issue is also tracked as TROVE-2021-005 and
- CVE-2021-34549. Reported by Jann Horn from Google's Project Zero.
- - Fix an out-of-bounds memory access in v3 onion service descriptor
- parsing. An attacker could exploit this bug by crafting an onion
- service descriptor that would crash any client that tried to visit
- it. Fixes bug 40392; bugfix on 0.3.0.1-alpha. This issue is also
- tracked as TROVE-2021-006 and CVE-2021-34550. Reported by Sergei
- Glazunov from Google's Project Zero.
- o Minor features (compatibility, backport from 0.4.6.4-rc):
- - Remove an assertion function related to TLS renegotiation. It was
- used nowhere outside the unit tests, and it was breaking
- compilation with recent alpha releases of OpenSSL 3.0.0. Closes
- ticket 40399.
- o Minor features (geoip data):
- - Update the geoip files to match the IPFire Location Database, as
- retrieved on 2021/06/10.
- o Minor bugfixes (control, sandbox, backport from 0.4.6.4-rc):
- - Allow the control command SAVECONF to succeed when the seccomp
- sandbox is enabled, and make SAVECONF keep only one backup file to
- simplify implementation. Previously SAVECONF allowed a large
- number of backup files, which made it incompatible with the
- sandbox. Fixes bug 40317; bugfix on 0.2.5.4-alpha. Patch by
- Daniel Pinto.
- o Minor bugfixes (metrics port, backport from 0.4.6.4-rc):
- - Fix a bug that made tor try to re-bind() on an already open
- MetricsPort every 60 seconds. Fixes bug 40370; bugfix
- on 0.4.5.1-alpha.
- Changes in version 0.4.4.9 - 2021-06-14
- Tor 0.4.4.9 fixes several security issues, including a
- denial-of-service attack against onion service clients, and another
- denial-of-service attack against relays. Everybody should upgrade to
- one of 0.3.5.15, 0.4.4.9, 0.4.5.9, or 0.4.6.5.
- Note that the scheduled end-of-life date for the Tor 0.4.4.x series is
- June 15. This is therefore the last release in its series. Everybody
- still running 0.4.4.x should plan to upgrade to 0.4.5.x or later.
- o Major bugfixes (security, backport from 0.4.6.5):
- - Don't allow relays to spoof RELAY_END or RELAY_RESOLVED cell on
- half-closed streams. Previously, clients failed to validate which
- hop sent these cells: this would allow a relay on a circuit to end
- a stream that wasn't actually built with it. Fixes bug 40389;
- bugfix on 0.3.5.1-alpha. This issue is also tracked as TROVE-2021-
- 003 and CVE-2021-34548.
- o Major bugfixes (security, defense-in-depth, backport from 0.4.6.5):
- - Detect more failure conditions from the OpenSSL RNG code.
- Previously, we would detect errors from a missing RNG
- implementation, but not failures from the RNG code itself.
- Fortunately, it appears those failures do not happen in practice
- when Tor is using OpenSSL's default RNG implementation. Fixes bug
- 40390; bugfix on 0.2.8.1-alpha. This issue is also tracked as
- TROVE-2021-004. Reported by Jann Horn at Google's Project Zero.
- o Major bugfixes (security, denial of service, backport from 0.4.6.5):
- - Resist a hashtable-based CPU denial-of-service attack against
- relays. Previously we used a naive unkeyed hash function to look
- up circuits in a circuitmux object. An attacker could exploit this
- to construct circuits with chosen circuit IDs, to create
- collisions and make the hash table inefficient. Now we use a
- SipHash construction here instead. Fixes bug 40391; bugfix on
- 0.2.4.4-alpha. This issue is also tracked as TROVE-2021-005 and
- CVE-2021-34549. Reported by Jann Horn from Google's Project Zero.
- - Fix an out-of-bounds memory access in v3 onion service descriptor
- parsing. An attacker could exploit this bug by crafting an onion
- service descriptor that would crash any client that tried to visit
- it. Fixes bug 40392; bugfix on 0.3.0.1-alpha. This issue is also
- tracked as TROVE-2021-006 and CVE-2021-34550. Reported by Sergei
- Glazunov from Google's Project Zero.
- o Minor features (compatibility, backport from 0.4.6.4-rc):
- - Remove an assertion function related to TLS renegotiation. It was
- used nowhere outside the unit tests, and it was breaking
- compilation with recent alpha releases of OpenSSL 3.0.0. Closes
- ticket 40399.
- o Minor features (fallback directory list, backport from 0.4.6.2-alpha):
- - Regenerate the list of fallback directories to contain a new set
- of 200 relays. Closes ticket 40265.
- o Minor features (geoip data):
- - Update the geoip files to match the IPFire Location Database, as
- retrieved on 2021/06/10.
- o Minor bugfixes (channel, DoS, backport from 0.4.6.2-alpha):
- - Fix a non-fatal BUG() message due to a too-early free of a string,
- when listing a client connection from the DoS defenses subsystem.
- Fixes bug 40345; bugfix on 0.4.3.4-rc.
- o Minor bugfixes (compiler warnings, backport from 0.4.6.3-rc):
- - Fix an indentation problem that led to a warning from GCC 11.1.1.
- Fixes bug 40380; bugfix on 0.3.0.1-alpha.
- Changes in version 0.3.5.15 - 2021-06-14
- Tor 0.3.5.15 fixes several security issues, including a
- denial-of-service attack against onion service clients, and another
- denial-of-service attack against relays. Everybody should upgrade to
- one of 0.3.5.15, 0.4.4.9, 0.4.5.9, or 0.4.6.5.
- o Major bugfixes (security, backport from 0.4.6.5):
- - Don't allow relays to spoof RELAY_END or RELAY_RESOLVED cell on
- half-closed streams. Previously, clients failed to validate which
- hop sent these cells: this would allow a relay on a circuit to end
- a stream that wasn't actually built with it. Fixes bug 40389;
- bugfix on 0.3.5.1-alpha. This issue is also tracked as TROVE-2021-
- 003 and CVE-2021-34548.
- o Major bugfixes (security, defense-in-depth, backport from 0.4.6.5):
- - Detect more failure conditions from the OpenSSL RNG code.
- Previously, we would detect errors from a missing RNG
- implementation, but not failures from the RNG code itself.
- Fortunately, it appears those failures do not happen in practice
- when Tor is using OpenSSL's default RNG implementation. Fixes bug
- 40390; bugfix on 0.2.8.1-alpha. This issue is also tracked as
- TROVE-2021-004. Reported by Jann Horn at Google's Project Zero.
- o Major bugfixes (security, denial of service, backport from 0.4.6.5):
- - Resist a hashtable-based CPU denial-of-service attack against
- relays. Previously we used a naive unkeyed hash function to look
- up circuits in a circuitmux object. An attacker could exploit this
- to construct circuits with chosen circuit IDs, to create
- collisions and make the hash table inefficient. Now we use a
- SipHash construction here instead. Fixes bug 40391; bugfix on
- 0.2.4.4-alpha. This issue is also tracked as TROVE-2021-005 and
- CVE-2021-34549. Reported by Jann Horn from Google's Project Zero.
- - Fix an out-of-bounds memory access in v3 onion service descriptor
- parsing. An attacker could exploit this bug by crafting an onion
- service descriptor that would crash any client that tried to visit
- it. Fixes bug 40392; bugfix on 0.3.0.1-alpha. This issue is also
- tracked as TROVE-2021-006 and CVE-2021-34550. Reported by Sergei
- Glazunov from Google's Project Zero.
- o Minor bugfixes (compiler warnings, backport from 0.4.6.3-rc):
- - Fix an indentation problem that led to a warning from GCC 11.1.1.
- Fixes bug 40380; bugfix on 0.3.0.1-alpha.
- o Minor features (compatibility, backport from 0.4.6.4-rc):
- - Remove an assertion function related to TLS renegotiation. It was
- used nowhere outside the unit tests, and it was breaking
- compilation with recent alpha releases of OpenSSL 3.0.0. Closes
- ticket 40399.
- o Minor features (fallback directory list, backport from 0.4.6.2-alpha):
- - Regenerate the list of fallback directories to contain a new set
- of 200 relays. Closes ticket 40265.
- o Minor features (geoip data):
- - Update the geoip files to match the IPFire Location Database, as
- retrieved on 2021/06/10.
- Changes in version 0.4.5.8 - 2021-05-10
- Tor 0.4.5.8 fixes several bugs in earlier version, backporting fixes
- from the 0.4.6.x series.
- o Minor features (compatibility, Linux seccomp sandbox, backport from 0.4.6.3-rc):
- - Add a workaround to enable the Linux sandbox to work correctly
- with Glibc 2.33. This version of Glibc has started using the
- fstatat() system call, which previously our sandbox did not allow.
- Closes ticket 40382; see the ticket for a discussion of trade-offs.
- o Minor features (compilation, backport from 0.4.6.3-rc):
- - Make the autoconf script build correctly with autoconf versions
- 2.70 and later. Closes part of ticket 40335.
- o Minor features (fallback directory list, backport from 0.4.6.2-alpha):
- - Regenerate the list of fallback directories to contain a new set
- of 200 relays. Closes ticket 40265.
- o Minor features (geoip data):
- - Update the geoip files to match the IPFire Location Database, as
- retrieved on 2021/05/07.
- o Minor features (onion services):
- - Add warning message when connecting to now deprecated v2 onion
- services. As announced, Tor 0.4.5.x is the last series that will
- support v2 onions. Closes ticket 40373.
- o Minor bugfixes (bridge, pluggable transport, backport from 0.4.6.2-alpha):
- - Fix a regression that made it impossible start Tor using a bridge
- line with a transport name and no fingerprint. Fixes bug 40360;
- bugfix on 0.4.5.4-rc.
- o Minor bugfixes (build, cross-compilation, backport from 0.4.6.3-rc):
- - Allow a custom "ar" for cross-compilation. Our previous build
- script had used the $AR environment variable in most places, but
- it missed one. Fixes bug 40369; bugfix on 0.4.5.1-alpha.
- o Minor bugfixes (channel, DoS, backport from 0.4.6.2-alpha):
- - Fix a non-fatal BUG() message due to a too-early free of a string,
- when listing a client connection from the DoS defenses subsystem.
- Fixes bug 40345; bugfix on 0.4.3.4-rc.
- o Minor bugfixes (compiler warnings, backport from 0.4.6.3-rc):
- - Fix an indentation problem that led to a warning from GCC 11.1.1.
- Fixes bug 40380; bugfix on 0.3.0.1-alpha.
- o Minor bugfixes (controller, backport from 0.4.6.1-alpha):
- - Fix a "BUG" warning that would appear when a controller chooses
- the first hop for a circuit, and that circuit completes. Fixes bug
- 40285; bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (onion service, client, memory leak, backport from 0.4.6.3-rc):
- - Fix a bug where an expired cached descriptor could get overwritten
- with a new one without freeing it, leading to a memory leak. Fixes
- bug 40356; bugfix on 0.3.5.1-alpha.
- o Minor bugfixes (testing, BSD, backport from 0.4.6.2-alpha):
- - Fix pattern-matching errors when patterns expand to invalid paths
- on BSD systems. Fixes bug 40318; bugfix on 0.4.5.1-alpha. Patch by
- Daniel Pinto.
- Changes in version 0.3.5.14 - 2021-03-16
- Tor 0.3.5.14 backports fixes for two important denial-of-service bugs
- in earlier versions of Tor.
- One of these vulnerabilities (TROVE-2021-001) would allow an attacker
- who can send directory data to a Tor instance to force that Tor
- instance to consume huge amounts of CPU. This is easiest to exploit
- against authorities, since anybody can upload to them, but directory
- caches could also exploit this vulnerability against relays or clients
- when they download. The other vulnerability (TROVE-2021-002) only
- affects directory authorities, and would allow an attacker to remotely
- crash the authority with an assertion failure. Patches have already
- been provided to the authority operators, to help ensure
- network stability.
- We recommend that everybody upgrade to one of the releases that fixes
- these issues (0.3.5.14, 0.4.4.8, or 0.4.5.7) as they become available
- to you.
- This release also updates our GeoIP data source, and fixes a
- compatibility issue.
- o Major bugfixes (security, denial of service, backport from 0.4.5.7):
- - Disable the dump_desc() function that we used to dump unparseable
- information to disk. It was called incorrectly in several places,
- in a way that could lead to excessive CPU usage. Fixes bug 40286;
- bugfix on 0.2.2.1-alpha. This bug is also tracked as TROVE-2021-
- 001 and CVE-2021-28089.
- - Fix a bug in appending detached signatures to a pending consensus
- document that could be used to crash a directory authority. Fixes
- bug 40316; bugfix on 0.2.2.6-alpha. Tracked as TROVE-2021-002
- and CVE-2021-28090.
- o Minor features (geoip data, backport from 0.4.5.7):
- - We have switched geoip data sources. Previously we shipped IP-to-
- country mappings from Maxmind's GeoLite2, but in 2019 they changed
- their licensing terms, so we were unable to update them after that
- point. We now ship geoip files based on the IPFire Location
- Database instead. (See https://location.ipfire.org/ for more
- information). This release updates our geoip files to match the
- IPFire Location Database as retrieved on 2021/03/12. Closes
- ticket 40224.
- o Removed features (mallinfo deprecated, backport from 0.4.5.7):
- - Remove mallinfo() usage entirely. Libc 2.33+ now deprecates it.
- Closes ticket 40309.
- Changes in version 0.4.4.8 - 2021-03-16
- Tor 0.4.4.8 backports fixes for two important denial-of-service bugs
- in earlier versions of Tor.
- One of these vulnerabilities (TROVE-2021-001) would allow an attacker
- who can send directory data to a Tor instance to force that Tor
- instance to consume huge amounts of CPU. This is easiest to exploit
- against authorities, since anybody can upload to them, but directory
- caches could also exploit this vulnerability against relays or clients
- when they download. The other vulnerability (TROVE-2021-002) only
- affects directory authorities, and would allow an attacker to remotely
- crash the authority with an assertion failure. Patches have already
- been provided to the authority operators, to help ensure
- network stability.
- We recommend that everybody upgrade to one of the releases that fixes
- these issues (0.3.5.14, 0.4.4.8, or 0.4.5.7) as they become available
- to you.
- This release also updates our GeoIP data source, and fixes a
- compatibility issue.
- o Major bugfixes (security, denial of service, backport from 0.4.5.7):
- - Disable the dump_desc() function that we used to dump unparseable
- information to disk. It was called incorrectly in several places,
- in a way that could lead to excessive CPU usage. Fixes bug 40286;
- bugfix on 0.2.2.1-alpha. This bug is also tracked as TROVE-2021-
- 001 and CVE-2021-28089.
- - Fix a bug in appending detached signatures to a pending consensus
- document that could be used to crash a directory authority. Fixes
- bug 40316; bugfix on 0.2.2.6-alpha. Tracked as TROVE-2021-002
- and CVE-2021-28090.
- o Minor features (geoip data, backport from 0.4.5.7):
- - We have switched geoip data sources. Previously we shipped IP-to-
- country mappings from Maxmind's GeoLite2, but in 2019 they changed
- their licensing terms, so we were unable to update them after that
- point. We now ship geoip files based on the IPFire Location
- Database instead. (See https://location.ipfire.org/ for more
- information). This release updates our geoip files to match the
- IPFire Location Database as retrieved on 2021/03/12. Closes
- ticket 40224.
- o Removed features (mallinfo deprecated, backport from 0.4.5.7):
- - Remove mallinfo() usage entirely. Libc 2.33+ now deprecates it.
- Closes ticket 40309.
- Changes in version 0.4.5.7 - 2021-03-16
- Tor 0.4.5.7 fixes two important denial-of-service bugs in earlier
- versions of Tor.
- One of these vulnerabilities (TROVE-2021-001) would allow an attacker
- who can send directory data to a Tor instance to force that Tor
- instance to consume huge amounts of CPU. This is easiest to exploit
- against authorities, since anybody can upload to them, but directory
- caches could also exploit this vulnerability against relays or clients
- when they download. The other vulnerability (TROVE-2021-002) only
- affects directory authorities, and would allow an attacker to remotely
- crash the authority with an assertion failure. Patches have already
- been provided to the authority operators, to help ensure
- network stability.
- We recommend that everybody upgrade to one of the releases that fixes
- these issues (0.3.5.14, 0.4.4.8, or 0.4.5.7) as they become available
- to you.
- This release also updates our GeoIP data source, and fixes a few
- smaller bugs in earlier releases.
- o Major bugfixes (security, denial of service):
- - Disable the dump_desc() function that we used to dump unparseable
- information to disk. It was called incorrectly in several places,
- in a way that could lead to excessive CPU usage. Fixes bug 40286;
- bugfix on 0.2.2.1-alpha. This bug is also tracked as TROVE-2021-
- 001 and CVE-2021-28089.
- - Fix a bug in appending detached signatures to a pending consensus
- document that could be used to crash a directory authority. Fixes
- bug 40316; bugfix on 0.2.2.6-alpha. Tracked as TROVE-2021-002
- and CVE-2021-28090.
- o Minor features (geoip data):
- - We have switched geoip data sources. Previously we shipped IP-to-
- country mappings from Maxmind's GeoLite2, but in 2019 they changed
- their licensing terms, so we were unable to update them after that
- point. We now ship geoip files based on the IPFire Location
- Database instead. (See https://location.ipfire.org/ for more
- information). This release updates our geoip files to match the
- IPFire Location Database as retrieved on 2021/03/12. Closes
- ticket 40224.
- o Minor bugfixes (directory authority):
- - Now that exit relays don't allow exit connections to directory
- authority DirPorts (to prevent network reentry), disable
- authorities' reachability self test on the DirPort. Fixes bug
- 40287; bugfix on 0.4.5.5-rc.
- o Minor bugfixes (documentation):
- - Fix a formatting error in the documentation for
- VirtualAddrNetworkIPv6. Fixes bug 40256; bugfix on 0.2.9.4-alpha.
- o Minor bugfixes (Linux, relay):
- - Fix a bug in determining total available system memory that would
- have been triggered if the format of Linux's /proc/meminfo file
- had ever changed to include "MemTotal:" in the middle of a line.
- Fixes bug 40315; bugfix on 0.2.5.4-alpha.
- o Minor bugfixes (metrics port):
- - Fix a BUG() warning on the MetricsPort for an internal missing
- handler. Fixes bug 40295; bugfix on 0.4.5.1-alpha.
- o Minor bugfixes (onion service):
- - Remove a harmless BUG() warning when reloading tor configured with
- onion services. Fixes bug 40334; bugfix on 0.4.5.1-alpha.
- o Minor bugfixes (portability):
- - Fix a non-portable usage of "==" with "test" in the configure
- script. Fixes bug 40298; bugfix on 0.4.5.1-alpha.
- o Minor bugfixes (relay):
- - Remove a spammy log notice falsely claiming that the IPv4/v6
- address was missing. Fixes bug 40300; bugfix on 0.4.5.1-alpha.
- - Do not query the address cache early in the boot process when
- deciding if a relay needs to fetch early directory information
- from an authority. This bug resulted in a relay falsely believing
- it didn't have an address and thus triggering an authority fetch
- at each boot. Related to our fix for 40300.
- o Removed features (mallinfo deprecated):
- - Remove mallinfo() usage entirely. Libc 2.33+ now deprecates it.
- Closes ticket 40309.
- Changes in version 0.4.5.6 - 2021-02-15
- The Tor 0.4.5.x release series is dedicated to the memory of Karsten
- Loesing (1979-2020), Tor developer, cypherpunk, husband, and father.
- Karsten is best known for creating the Tor metrics portal and leading
- the metrics team, but he was involved in Tor from the early days. For
- example, while he was still a student he invented and implemented the
- v2 onion service directory design, and he also served as an ambassador
- to the many German researchers working in the anonymity field. We
- loved him and respected him for his patience, his consistency, and his
- welcoming approach to growing our community.
- This release series introduces significant improvements in relay IPv6
- address discovery, a new "MetricsPort" mechanism for relay operators
- to measure performance, LTTng support, build system improvements to
- help when using Tor as a static library, and significant bugfixes
- related to Windows relay performance. It also includes numerous
- smaller features and bugfixes.
- Below are the changes since 0.4.4.7. For a list of changes since
- 0.4.5.5-rc, see the ChangeLog file.
- o Major features (build):
- - When building Tor, first link all object files into a single
- static library. This may help with embedding Tor in other
- programs. Note that most Tor functions do not constitute a part of
- a stable or supported API: only those functions in tor_api.h
- should be used if embedding Tor. Closes ticket 40127.
- o Major features (metrics):
- - Introduce a new MetricsPort which exposes, through an HTTP
- interface, a series of metrics that tor collects at runtime. At
- the moment, the only supported output format is Prometheus data
- model. Closes ticket 40063. See the manual page for more
- information and security considerations.
- o Major features (relay, IPv6):
- - The torrc option Address now supports IPv6. This unifies our
- address discovery interface to support IPv4, IPv6, and hostnames.
- Closes ticket 33233.
- - Launch IPv4 and IPv6 ORPort self-test circuits on relays and
- bridges. Closes ticket 33222.
- - Relays now automatically bind on IPv6 for their ORPort, unless
- specified otherwise with the IPv4Only flag. Closes ticket 33246.
- - When a relay with IPv6 support is told to open a connection to
- another relay, and the extend cell lists both IPv4 and IPv6
- addresses, the first relay now picks randomly which address to
- use. Closes ticket 33220.
- - Relays now track their IPv6 ORPort reachability separately from
- the reachability of their IPv4 ORPort. They will not publish a
- descriptor unless _both_ ports appear to be externally reachable.
- Closes ticket 34067.
- o Major features (tracing):
- - Add event-tracing library support for USDT and LTTng-UST, and a
- few tracepoints in the circuit subsystem. More will come
- incrementally. This feature is compiled out by default: it needs
- to be enabled at configure time. See documentation in
- doc/HACKING/Tracing.md. Closes ticket 32910.
- o Major bugfixes (directory cache, performance, windows):
- - Limit the number of items in the consensus diff cache to 64 on
- Windows. We hope this will mitigate an issue where Windows relay
- operators reported Tor using 100% CPU, while we investigate better
- solutions. Fixes bug 24857; bugfix on 0.3.1.1-alpha.
- o Major bugfixes (relay, windows):
- - Fix a bug in our implementation of condition variables on Windows.
- Previously, a relay on Windows would use 100% CPU after running
- for some time. Because of this change, Tor now require Windows
- Vista or later to build and run. Fixes bug 30187; bugfix on
- 0.2.6.3-alpha. (This bug became more serious in 0.3.1.1-alpha with
- the introduction of consensus diffs.) Patch by Daniel Pinto.
- o Major bugfixes (TLS, buffer):
- - When attempting to read N bytes on a TLS connection, really try to
- read all N bytes. Previously, Tor would stop reading after the
- first TLS record, which can be smaller than the N bytes requested,
- and not check for more data until the next mainloop event. Fixes
- bug 40006; bugfix on 0.1.0.5-rc.
- o Minor features (address discovery):
- - If no Address statements are found, relays now prioritize guessing
- their address by looking at the local interface instead of the
- local hostname. If the interface address can't be found, the local
- hostname is used. Closes ticket 33238.
- o Minor features (admin tools):
- - Add a new --format argument to -key-expiration option to allow
- specifying the time format of the expiration date. Adds Unix
- timestamp format support. Patch by Daniel Pinto. Closes
- ticket 30045.
- o Minor features (authority, logging):
- - Log more information for directory authority operators during the
- consensus voting process, and while processing relay descriptors.
- Closes ticket 40245.
- o Minor features (bootstrap reporting):
- - When reporting bootstrapping status on a relay, do not consider
- connections that have never been the target of an origin circuit.
- Previously, all connection failures were treated as potential
- bootstrapping failures, including connections that had been opened
- because of client requests. Closes ticket 25061.
- o Minor features (build):
- - When running the configure script, try to detect version
- mismatches between the OpenSSL headers and libraries, and suggest
- that the user should try "--with-openssl-dir". Closes 40138.
- - If the configure script has given any warnings, remind the user
- about them at the end of the script. Related to 40138.
- o Minor features (configuration):
- - Allow using wildcards (* and ?) with the %include option on
- configuration files. Closes ticket 25140. Patch by Daniel Pinto.
- - Allow the configuration options EntryNodes, ExcludeNodes,
- ExcludeExitNodes, ExitNodes, MiddleNodes, HSLayer2Nodes and
- HSLayer3Nodes to be specified multiple times. Closes ticket 28361.
- Patch by Daniel Pinto.
- o Minor features (control port):
- - Add a DROPTIMEOUTS command to drop circuit build timeout history
- and reset the current timeout. Closes ticket 40002.
- - When a stream enters the AP_CONN_STATE_CONTROLLER_WAIT status,
- send a control port event. Closes ticket 32190. Patch by
- Neel Chauhan.
- - Introduce GETINFO "stats/ntor/{assigned/requested}" and
- "stats/tap/{assigned/requested}" to get the NTor and TAP circuit
- onion handshake counts respectively. Closes ticket 28279. Patch by
- Neel Chauhan.
- o Minor features (control port, IPv6):
- - Tor relays now try to report to the controller when they are
- launching an IPv6 self-test. Closes ticket 34068.
- - Introduce "GETINFO address/v4" and "GETINFO address/v6" in the
- control port to fetch the Tor host's respective IPv4 or IPv6
- address. We keep "GETINFO address" for backwards-compatibility.
- Closes ticket 40039. Patch by Neel Chauhan.
- o Minor features (directory authorities):
- - Add a new consensus method 30 that removes the unnecessary "="
- padding from ntor-onion-key. Closes ticket 7869. Patch by
- Daniel Pinto.
- - Directory authorities now reject descriptors from relays running
- Tor versions from the obsolete 0.4.1 series. Resolves ticket
- 34357. Patch by Neel Chauhan.
- - The AssumeReachable option no longer stops directory authorities
- from checking whether other relays are running. A new
- AuthDirTestReachability option can be used to disable these
- checks. Closes ticket 34445.
- - When looking for possible Sybil attacks, also consider IPv6
- addresses. Two routers are considered to have "the same" address
- by this metric if they are in the same /64 network. Patch from
- Maurice Pibouin. Closes ticket 7193.
- o Minor features (directory authorities, IPv6):
- - Make authorities add their IPv6 ORPort (if any) to the trusted
- servers list. Authorities previously added only their IPv4
- addresses. Closes ticket 32822.
- o Minor features (documentation):
- - Mention the "!badexit" directive that can appear in an authority's
- approved-routers file, and update the description of the
- "!invalid" directive. Closes ticket 40188.
- o Minor features (ed25519, relay):
- - Save a relay's base64-encoded ed25519 identity key to the data
- directory in a file named fingerprint-ed25519. Closes ticket
- 30642. Patch by Neel Chauhan.
- o Minor features (heartbeat):
- - Include the total number of inbound and outbound IPv4 and IPv6
- connections in the heartbeat message. Closes ticket 29113.
- o Minor features (IPv6, ExcludeNodes):
- - Handle IPv6 addresses in ExcludeNodes; previously they were
- ignored. Closes ticket 34065. Patch by Neel Chauhan.
- o Minor features (logging):
- - Add the running glibc version to the log, and the compiled glibc
- version to the library list returned when using --library-versions.
- Patch from Daniel Pinto. Closes ticket 40047.
- - Consider an HTTP 301 response to be an error (like a 404) when
- processing a directory response. Closes ticket 40053.
- - Log directory fetch statistics as a single line. Closes
- ticket 40159.
- - Provide more complete descriptions of our connections when logging
- about them. Closes ticket 40041.
- - When describing a relay in the logs, we now include its ed25519
- identity. Closes ticket 22668.
- o Minor features (onion services):
- - Only overwrite an onion service's existing hostname file if its
- contents are wrong. This enables read-only onion-service
- directories. Resolves ticket 40062. Patch by Neel Chauhan.
- o Minor features (pluggable transports):
- - Add an OutboundBindAddressPT option to allow users to specify
- which IPv4 and IPv6 address pluggable transports should use for
- outgoing IP packets. Tor does not have a way to enforce that the
- pluggable transport honors this option, so each pluggable transport
- needs to implement support on its own. Closes ticket 5304.
- o Minor features (protocol, proxy support, defense in depth):
- - Respond more deliberately to misbehaving proxies that leave
- leftover data on their connections, so as to make Tor even less
- likely to allow the proxies to pass their data off as having come
- from a relay. Closes ticket 40017.
- o Minor features (relay address tracking):
- - We now store relay addresses for OR connections in a more logical
- way. Previously we would sometimes overwrite the actual address of
- a connection with a "canonical address", and then store the "real
- address" elsewhere to remember it. We now track the "canonical
- address" elsewhere for the cases where we need it, and leave the
- connection's address alone. Closes ticket 33898.
- o Minor features (relay):
- - If a relay is unable to discover its address, attempt to learn it
- from the NETINFO cell. Closes ticket 40022.
- - Log immediately when launching a relay self-check. Previously we
- would try to log before launching checks, or approximately when we
- intended to launch checks, but this tended to be error-prone.
- Closes ticket 34137.
- o Minor features (relay, address discovery):
- - If Address option is not found in torrc, attempt to learn our
- address with the configured ORPort address if any. Closes
- ticket 33236.
- o Minor features (relay, IPv6):
- - Add an AssumeReachableIPv6 option to disable self-checking IPv6
- reachability. Closes part of ticket 33224.
- - Add new "assume-reachable" and "assume-reachable-ipv6" consensus
- parameters to be used in an emergency to tell relays that they
- should publish even if they cannot complete their ORPort self-
- checks. Closes ticket 34064 and part of 33224.
- - Allow relays to send IPv6-only extend cells. Closes ticket 33222.
- - Declare support for the Relay=3 subprotocol version. Closes
- ticket 33226.
- - When launching IPv6 ORPort self-test circuits, make sure that the
- second-last hop can initiate an IPv6 extend. Closes ticket 33222.
- o Minor features (safety):
- - Log a warning at startup if Tor is built with compile-time options
- that are likely to make it less stable or reliable. Closes
- ticket 18888.
- o Minor features (specification update):
- - Several fields in microdescriptors, router descriptors, and
- consensus documents that were formerly optional are now required.
- Implements proposal 315; closes ticket 40132.
- o Minor features (state management):
- - When loading the state file, remove entries from the statefile
- that have been obsolete for a long time. Ordinarily Tor preserves
- unrecognized entries in order to keep forward-compatibility, but
- these entries have not actually been used in any release since
- before 0.3.5.x. Closes ticket 40137.
- o Minor features (statistics, ipv6):
- - Relays now publish IPv6-specific counts of single-direction versus
- bidirectional relay connections. Closes ticket 33264.
- - Relays now publish their IPv6 read and write statistics over time,
- if statistics are enabled. Closes ticket 33263.
- o Minor features (subprotocol versions):
- - Use the new limitations on subprotocol versions due to proposal
- 318 to simplify our implementation. Part of ticket 40133.
- o Minor features (testing configuration):
- - The TestingTorNetwork option no longer implicitly sets
- AssumeReachable to 1. This change allows us to test relays' self-
- testing mechanisms, and to test authorities' relay-testing
- functionality. Closes ticket 34446.
- o Minor features (testing):
- - Added unit tests for channel_matches_target_addr_for_extend().
- Closes Ticket 33919. Patch by MrSquanchee.
- o Minor bugfixes (circuit padding):
- - When circpad_send_padding_cell_for_callback is called,
- `is_padding_timer_scheduled` flag was not reset. Now it is set to
- 0 at the top of that function. Fixes bug 32671; bugfix
- on 0.4.0.1-alpha.
- - Add a per-circuit padding machine instance counter, so we can
- differentiate between shutdown requests for old machines on a
- circuit. Fixes bug 30992; bugfix on 0.4.1.1-alpha.
- - Add the ability to keep circuit padding machines if they match a
- set of circuit states or purposes. This allows us to have machines
- that start up under some conditions but don't shut down under
- others. We now use this mask to avoid starting up introduction
- circuit padding again after the machines have already completed.
- Fixes bug 32040; bugfix on 0.4.1.1-alpha.
- o Minor bugfixes (circuit, handshake):
- - In the v3 handshaking code, use connection_or_change_state() to
- change the state. Previously, we changed the state directly, but
- this did not pass the state change to the pubsub or channel
- objects, potentially leading to bugs. Fixes bug 32880; bugfix on
- 0.2.3.6-alpha. Patch by Neel Chauhan.
- o Minor bugfixes (compilation):
- - Change the linker flag ordering in our library search code so that
- it works for compilers that need the libraries to be listed in the
- right order. Fixes bug 33624; bugfix on 0.1.1.0-alpha.
- - Fix the "--enable-static-tor" switch to properly set the "-static"
- compile option onto the tor binary only. Fixes bug 40111; bugfix
- on 0.2.3.1-alpha.
- o Minor bugfixes (configuration):
- - Exit Tor on a misconfiguration when the Bridge line is configured
- to use a transport but no corresponding ClientTransportPlugin can
- be found. Prior to this fix, Tor would attempt to connect to the
- bridge directly without using the transport, making it easier for
- adversaries to notice the bridge. Fixes bug 25528; bugfix
- on 0.2.6.1-alpha.
- o Minor bugfixes (control port):
- - Make sure we send the SOCKS request address in relay begin cells
- when a stream is attached with the purpose
- CIRCUIT_PURPOSE_CONTROLLER. Fixes bug 33124; bugfix on 0.0.5.
- Patch by Neel Chauhan.
- o Minor bugfixes (crash, relay, signing key):
- - Avoid assertion failures when we run Tor from the command line
- with `--key-expiration sign`, but an ORPort is not set. Fixes bug
- 40015; bugfix on 0.3.2.1-alpha. Patch by Neel Chauhan.
- o Minor bugfixes (logging):
- - Avoid a spurious log message about missing subprotocol versions,
- when the consensus that we're reading from is older than the
- current release. Previously we had made this message nonfatal, but
- in practice, it is never relevant when the consensus is older than
- the current release. Fixes bug 40281; bugfix on 0.4.0.1-alpha.
- - Remove trailing whitespace from control event log messages. Fixes
- bug 32178; bugfix on 0.1.1.1-alpha. Based on a patch by
- Amadeusz Pawlik.
- - Turn warning-level log message about SENDME failure into a debug-
- level message. (This event can happen naturally, and is no reason
- for concern). Fixes bug 40142; bugfix on 0.4.1.1-alpha.
- - When logging a rate-limited message about how many messages have
- been suppressed in the last N seconds, give an accurate value for
- N, rounded up to the nearest minute. Previously we would report
- the size of the rate-limiting interval, regardless of when the
- messages started to occur. Fixes bug 19431; bugfix
- on 0.2.2.16-alpha.
- o Minor bugfixes (onion services):
- - Avoid a non-fatal assertion in certain edge-cases when
- establishing a circuit to an onion service. Fixes bug 32666;
- bugfix on 0.3.0.3-alpha.
- o Minor bugfixes (rust, protocol versions):
- - Declare support for the onion service introduction point denial of
- service extensions when building with Rust. Fixes bug 34248;
- bugfix on 0.4.2.1-alpha.
- - Make Rust protocol version support checks consistent with the
- undocumented error behavior of the corresponding C code. Fixes bug
- 34251; bugfix on 0.3.3.5-rc.
- o Minor bugfixes (self-testing):
- - When receiving an incoming circuit, only accept it as evidence
- that we are reachable if the declared address of its channel is
- the same address we think that we have. Otherwise, it could be
- evidence that we're reachable on some other address. Fixes bug
- 20165; bugfix on 0.1.0.1-rc.
- o Minor bugfixes (spec conformance):
- - Use the correct key type when generating signing->link
- certificates. Fixes bug 40124; bugfix on 0.2.7.2-alpha.
- o Minor bugfixes (subprotocol versions):
- - Consistently reject extra commas, instead of only rejecting
- leading commas. Fixes bug 27194; bugfix on 0.2.9.4-alpha.
- - In summarize_protover_flags(), treat empty strings the same as
- NULL. This prevents protocols_known from being set. Previously, we
- treated empty strings as normal strings, which led to
- protocols_known being set. Fixes bug 34232; bugfix on
- 0.3.3.2-alpha. Patch by Neel Chauhan.
- o Code simplification and refactoring:
- - Add and use a set of functions to perform down-casts on constant
- connection and channel pointers. Closes ticket 40046.
- - Refactor our code that logs descriptions of connections, channels,
- and the peers on them, to use a single call path. This change
- enables us to refactor the data types that they use, and eliminates
- many confusing usages of those types. Closes ticket 40041.
- - Refactor some common node selection code into a single function.
- Closes ticket 34200.
- - Remove the now-redundant 'outbuf_flushlen' field from our
- connection type. It was previously used for an older version of
- our rate-limiting logic. Closes ticket 33097.
- - Rename "fascist_firewall_*" identifiers to "reachable_addr_*"
- instead, for consistency with other code. Closes ticket 18106.
- - Rename functions about "advertised" ports which are not in fact
- guaranteed to return the ports that have been advertised. Closes
- ticket 40055.
- - Split implementation of several command line options from
- options_init_from_torrc into smaller isolated functions. Patch by
- Daniel Pinto. Closes ticket 40102.
- - When an extend cell is missing an IPv4 or IPv6 address, fill in
- the address from the extend info. This is similar to what was done
- in ticket 33633 for ed25519 keys. Closes ticket 33816. Patch by
- Neel Chauhan.
- o Deprecated features:
- - The "non-builtin" argument to the "--dump-config" command is now
- deprecated. When it works, it behaves the same as "short", which
- you should use instead. Closes ticket 33398.
- o Documentation:
- - Replace URLs from our old bugtracker so that they refer to the new
- bugtracker and wiki. Closes ticket 40101.
- o Removed features:
- - We no longer ship or build a "tor.service" file for use with
- systemd. No distribution included this script unmodified, and we
- don't have the expertise ourselves to maintain this in a way that
- all the various systemd-based distributions can use. Closes
- ticket 30797.
- - We no longer ship support for the Android logging API. Modern
- versions of Android can use the syslog API instead. Closes
- ticket 32181.
- - The "optimistic data" feature is now always on; there is no longer
- an option to disable it from the torrc file or from the consensus
- directory. Closes part of 40139.
- - The "usecreatefast" network parameter is now removed; there is no
- longer an option for authorities to turn it off. Closes part
- of 40139.
- o Testing:
- - Add unit tests for bandwidth statistics manipulation functions.
- Closes ticket 33812. Patch by MrSquanchee.
- o Code simplification and refactoring (autoconf):
- - Remove autoconf checks for unused funcs and headers. Closes ticket
- 31699; Patch by @bduszel
- o Code simplification and refactoring (maintainer scripts):
- - Disable by default the pre-commit hook. Use the environment
- variable TOR_EXTRA_PRE_COMMIT_CHECKS in order to run it.
- Furthermore, stop running practracker in the pre-commit hook and
- make check-local. Closes ticket 40019.
- o Code simplification and refactoring (relay address):
- - Most of IPv4 representation was using "uint32_t". It has now been
- moved to use the internal "tor_addr_t" interface instead. This is
- so we can properly integrate IPv6 along IPv4 with common
- interfaces. Closes ticket 40043.
- o Documentation (manual page):
- - Move them from doc/ to doc/man/. Closes ticket 40044.
- - Describe the status of the "Sandbox" option more accurately. It is
- no longer "experimental", but it _is_ dependent on kernel and libc
- versions. Closes ticket 23378.
- o Documentation (tracing):
- - Document in depth the circuit subsystem trace events in the new
- doc/tracing/EventsCircuit.md. Closes ticket 40036.
- o Removed features (controller):
- - Remove the "GETINFO network-status" controller command. It has
- been deprecated since 0.3.1.1-alpha. Closes ticket 22473.
- Changes in version 0.4.4.7 - 2021-02-03
- Tor 0.4.4.7 backports numerous bugfixes from later releases,
- including one that made v3 onion services more susceptible to
- denial-of-service attacks, and a feature that makes some kinds of
- DoS attacks harder to perform.
- o Major bugfixes (onion service v3, backport from 0.4.5.3-rc):
- - Stop requiring a live consensus for v3 clients and services, and
- allow a "reasonably live" consensus instead. This allows v3 onion
- services to work even if the authorities fail to generate a
- consensus for more than 2 hours in a row. Fixes bug 40237; bugfix
- on 0.3.5.1-alpha.
- o Major feature (exit, backport from 0.4.5.5-rc):
- - Re-entry into the network is now denied at the Exit level to all
- relays' ORPorts and authorities' ORPorts and DirPorts. This change
- should help mitgate a set of denial-of-service attacks. Closes
- ticket 2667.
- o Minor feature (build system, backport from 0.4.5.4-rc):
- - New "make lsp" command to generate the compile_commands.json file
- used by the ccls language server. The "bear" program is needed for
- this. Closes ticket 40227.
- o Minor features (compilation, backport from 0.4.5.2-rc):
- - Disable deprecation warnings when building with OpenSSL 3.0.0 or
- later. There are a number of APIs newly deprecated in OpenSSL
- 3.0.0 that Tor still requires. (A later version of Tor will try to
- stop depending on these APIs.) Closes ticket 40165.
- o Minor features (crypto, backport from 0.4.5.3-rc):
- - Fix undefined behavior on our Keccak library. The bug only
- appeared on platforms with 32-byte CPU cache lines (e.g. armv5tel)
- and would result in wrong digests. Fixes bug 40210; bugfix on
- 0.2.8.1-alpha. Thanks to Bernhard Übelacker, Arnd Bergmann and
- weasel for diagnosing this.
- o Minor bugfixes (compatibility, backport from 0.4.5.1-rc):
- - Strip '\r' characters when reading text files on Unix platforms.
- This should resolve an issue where a relay operator migrates a
- relay from Windows to Unix, but does not change the line ending of
- Tor's various state files to match the platform, and the CRLF line
- endings from Windows end up leaking into other files such as the
- extra-info document. Fixes bug 33781; bugfix on 0.0.9pre5.
- o Minor bugfixes (compilation, backport from 0.4.5.3-rc):
- - Fix a compilation warning about unreachable fallthrough
- annotations when building with "--enable-all-bugs-are-fatal" on
- some compilers. Fixes bug 40241; bugfix on 0.3.5.4-alpha.
- o Minor bugfixes (SOCKS5, backport from 0.4.5.3-rc):
- - Handle partial SOCKS5 messages correctly. Previously, our code
- would send an incorrect error message if it got a SOCKS5 request
- that wasn't complete. Fixes bug 40190; bugfix on 0.3.5.1-alpha.
- o Minor bugfixes (testing, backport from 0.4.5.2-alpha):
- - Fix the `config/parse_tcp_proxy_line` test so that it works
- correctly on systems where the DNS provider hijacks invalid
- queries. Fixes part of bug 40179; bugfix on 0.4.3.1-alpha.
- - Fix our Python reference-implementation for the v3 onion service
- handshake so that it works correctly with the version of hashlib
- provided by Python 3.9. Fixes part of bug 40179; bugfix
- on 0.3.1.6-rc.
- - Fix the `tortls/openssl/log_one_error` test to work with OpenSSL
- 3.0.0. Fixes bug 40170; bugfix on 0.2.8.1-alpha.
- Changes in version 0.4.3.8 - 2021-02-03
- Tor 0.4.3.8 backports numerous bugfixes from later releases,
- including one that made v3 onion services more susceptible to
- denial-of-service attacks, and a feature that makes some kinds of
- DoS attacks harder to perform.
- Note that this is, in all likelihood, the last release of Tor 0.4.3.x,
- which will reach end-of-life on 15 Feb 2021.
- o Major bugfixes (onion service v3, backport from 0.4.5.3-rc):
- - Stop requiring a live consensus for v3 clients and services, and
- allow a "reasonably live" consensus instead. This allows v3 onion
- services to work even if the authorities fail to generate a
- consensus for more than 2 hours in a row. Fixes bug 40237; bugfix
- on 0.3.5.1-alpha.
- o Major bugfixes (stats, onion services, backport from 0.4.4.5):
- - Fix a bug where we were undercounting the Tor network's total
- onion service traffic, by ignoring any traffic originating from
- clients. Now we count traffic from both clients and services.
- Fixes bug 40117; bugfix on 0.2.6.2-alpha.
- o Major feature (exit, backport from 0.4.5.5-rc):
- - Re-entry into the network is now denied at the Exit level to all
- relays' ORPorts and authorities' ORPorts and DirPorts. This change
- should help mitgate a set of denial-of-service attacks. Closes
- ticket 2667.
- o Minor feature (build system, backport from 0.4.5.4-rc):
- - New "make lsp" command to generate the compile_commands.json file
- used by the ccls language server. The "bear" program is needed for
- this. Closes ticket 40227.
- o Minor features (compilation, backport from 0.4.5.2-rc):
- - Disable deprecation warnings when building with OpenSSL 3.0.0 or
- later. There are a number of APIs newly deprecated in OpenSSL
- 3.0.0 that Tor still requires. (A later version of Tor will try to
- stop depending on these APIs.) Closes ticket 40165.
- o Minor features (crypto, backport from 0.4.5.3-rc):
- - Fix undefined behavior on our Keccak library. The bug only
- appeared on platforms with 32-byte CPU cache lines (e.g. armv5tel)
- and would result in wrong digests. Fixes bug 40210; bugfix on
- 0.2.8.1-alpha. Thanks to Bernhard Übelacker, Arnd Bergmann and
- weasel for diagnosing this.
- o Minor bugfixes (compatibility, backport from 0.4.5.1-rc):
- - Strip '\r' characters when reading text files on Unix platforms.
- This should resolve an issue where a relay operator migrates a
- relay from Windows to Unix, but does not change the line ending of
- Tor's various state files to match the platform, and the CRLF line
- endings from Windows end up leaking into other files such as the
- extra-info document. Fixes bug 33781; bugfix on 0.0.9pre5.
- o Minor bugfixes (compilation, backport from 0.4.5.1-rc):
- - Resolve a compilation warning that could occur in
- test_connection.c. Fixes bug 40113; bugfix on 0.2.9.3-alpha.
- o Minor bugfixes (compilation, backport from 0.4.5.3-rc):
- - Fix a compilation warning about unreachable fallthrough
- annotations when building with "--enable-all-bugs-are-fatal" on
- some compilers. Fixes bug 40241; bugfix on 0.3.5.4-alpha.
- o Minor bugfixes (SOCKS5, backport from 0.4.5.3-rc):
- - Handle partial SOCKS5 messages correctly. Previously, our code
- would send an incorrect error message if it got a SOCKS5 request
- that wasn't complete. Fixes bug 40190; bugfix on 0.3.5.1-alpha.
- o Minor bugfixes (testing, backport from 0.4.5.2-alpha):
- - Fix the `config/parse_tcp_proxy_line` test so that it works
- correctly on systems where the DNS provider hijacks invalid
- queries. Fixes part of bug 40179; bugfix on 0.4.3.1-alpha.
- - Fix our Python reference-implementation for the v3 onion service
- handshake so that it works correctly with the version of hashlib
- provided by Python 3.9. Fixes part of bug 40179; bugfix
- on 0.3.1.6-rc.
- - Fix the `tortls/openssl/log_one_error` test to work with OpenSSL
- 3.0.0. Fixes bug 40170; bugfix on 0.2.8.1-alpha.
- Changes in version 0.3.5.13 - 2020-02-03
- Tor 0.3.5.13 backports numerous bugfixes from later releases,
- including one that made v3 onion services more susceptible to
- denial-of-service attacks, and a feature that makes some kinds of
- DoS attacks harder to perform.
- o Major bugfixes (onion service v3, backport from 0.4.5.3-rc):
- - Stop requiring a live consensus for v3 clients and services, and
- allow a "reasonably live" consensus instead. This allows v3 onion
- services to work even if the authorities fail to generate a
- consensus for more than 2 hours in a row. Fixes bug 40237; bugfix
- on 0.3.5.1-alpha.
- o Major bugfixes (stats, onion services, backport from 0.4.4.5):
- - Fix a bug where we were undercounting the Tor network's total
- onion service traffic, by ignoring any traffic originating from
- clients. Now we count traffic from both clients and services.
- Fixes bug 40117; bugfix on 0.2.6.2-alpha.
- o Major feature (exit, backport from 0.4.5.5-rc):
- - Re-entry into the network is now denied at the Exit level to all
- relays' ORPorts and authorities' ORPorts and DirPorts. This change
- should help mitgate a set of denial-of-service attacks. Closes
- ticket 2667.
- o Minor feature (build system, backport from 0.4.5.4-rc):
- - New "make lsp" command to generate the compile_commands.json file
- used by the ccls language server. The "bear" program is needed for
- this. Closes ticket 40227.
- o Minor features (compilation, backport from 0.4.5.2-rc):
- - Disable deprecation warnings when building with OpenSSL 3.0.0 or
- later. There are a number of APIs newly deprecated in OpenSSL
- 3.0.0 that Tor still requires. (A later version of Tor will try to
- stop depending on these APIs.) Closes ticket 40165.
- o Minor features (crypto, backport from 0.4.5.3-rc):
- - Fix undefined behavior on our Keccak library. The bug only
- appeared on platforms with 32-byte CPU cache lines (e.g. armv5tel)
- and would result in wrong digests. Fixes bug 40210; bugfix on
- 0.2.8.1-alpha. Thanks to Bernhard Übelacker, Arnd Bergmann and
- weasel for diagnosing this.
- o Minor bugfixes (compatibility, backport from 0.4.5.1-rc):
- - Strip '\r' characters when reading text files on Unix platforms.
- This should resolve an issue where a relay operator migrates a
- relay from Windows to Unix, but does not change the line ending of
- Tor's various state files to match the platform, and the CRLF line
- endings from Windows end up leaking into other files such as the
- extra-info document. Fixes bug 33781; bugfix on 0.0.9pre5.
- o Minor bugfixes (compilation, backport from 0.4.5.1-rc):
- - Resolve a compilation warning that could occur in
- test_connection.c. Fixes bug 40113; bugfix on 0.2.9.3-alpha.
- o Minor bugfixes (compilation, backport from 0.4.5.3-rc):
- - Fix a compilation warning about unreachable fallthrough
- annotations when building with "--enable-all-bugs-are-fatal" on
- some compilers. Fixes bug 40241; bugfix on 0.3.5.4-alpha.
- o Minor bugfixes (SOCKS5, backport from 0.4.5.3-rc):
- - Handle partial SOCKS5 messages correctly. Previously, our code
- would send an incorrect error message if it got a SOCKS5 request
- that wasn't complete. Fixes bug 40190; bugfix on 0.3.5.1-alpha.
- o Minor bugfixes (testing, backport from 0.4.5.2-alpha):
- - Fix our Python reference-implementation for the v3 onion service
- handshake so that it works correctly with the version of hashlib
- provided by Python 3.9. Fixes part of bug 40179; bugfix
- on 0.3.1.6-rc.
- - Fix the `tortls/openssl/log_one_error` test to work with OpenSSL
- 3.0.0. Fixes bug 40170; bugfix on 0.2.8.1-alpha.
- Changes in version 0.4.4.6 - 2020-11-12
- Tor 0.4.4.6 is the second stable release in the 0.4.4.x series. It
- backports fixes from later releases, including a fix for TROVE-2020-
- 005, a security issue that could be used, under certain cases, by an
- adversary to observe traffic patterns on a limited number of circuits
- intended for a different relay.
- o Major bugfixes (security, backport from 0.4.5.1-alpha):
- - When completing a channel, relays now check more thoroughly to
- make sure that it matches any pending circuits before attaching
- those circuits. Previously, address correctness and Ed25519
- identities were not checked in this case, but only when extending
- circuits on an existing channel. Fixes bug 40080; bugfix on
- 0.2.7.2-alpha. Resolves TROVE-2020-005.
- o Minor features (directory authorities, backport from 0.4.5.1-alpha):
- - Authorities now list a different set of protocols as required and
- recommended. These lists have been chosen so that only truly
- recommended and/or required protocols are included, and so that
- clients using 0.2.9 or later will continue to work (even though
- they are not supported), whereas only relays running 0.3.5 or
- later will meet the requirements. Closes ticket 40162.
- - Make it possible to specify multiple ConsensusParams torrc lines.
- Now directory authority operators can for example put the main
- ConsensusParams config in one torrc file and then add to it from a
- different torrc file. Closes ticket 40164.
- o Minor features (subprotocol versions, backport from 0.4.5.1-alpha):
- - Tor no longer allows subprotocol versions larger than 63.
- Previously version numbers up to UINT32_MAX were allowed, which
- significantly complicated our code. Implements proposal 318;
- closes ticket 40133.
- o Minor features (tests, v2 onion services, backport from 0.4.5.1-alpha):
- - Fix a rendezvous cache unit test that was triggering an underflow
- on the global rend cache allocation. Fixes bug 40125; bugfix
- on 0.2.8.1-alpha.
- - Fix another rendezvous cache unit test that was triggering an
- underflow on the global rend cache allocation. Fixes bug 40126;
- bugfix on 0.2.8.1-alpha.
- o Minor bugfixes (compilation, backport from 0.4.5.1-alpha):
- - Fix compiler warnings that would occur when building with
- "--enable-all-bugs-are-fatal" and "--disable-module-relay" at the
- same time. Fixes bug 40129; bugfix on 0.4.4.1-alpha.
- - Resolve a compilation warning that could occur in
- test_connection.c. Fixes bug 40113; bugfix on 0.2.9.3-alpha.
- o Minor bugfixes (logging, backport from 0.4.5.1-alpha):
- - Remove a debug logging statement that uselessly spammed the logs.
- Fixes bug 40135; bugfix on 0.3.5.0-alpha.
- o Minor bugfixes (relay configuration, crash, backport from 0.4.5.1-alpha):
- - Avoid a fatal assert() when failing to create a listener
- connection for an address that was in use. Fixes bug 40073; bugfix
- on 0.3.5.1-alpha.
- o Minor bugfixes (v2 onion services, backport from 0.4.5.1-alpha):
- - For HSFETCH commands on v2 onion services addresses, check the
- length of bytes decoded, not the base32 length. Fixes bug 34400;
- bugfix on 0.4.1.1-alpha. Patch by Neel Chauhan.
- Changes in version 0.4.3.7 - 2020-11-12
- Tor 0.4.3.7 backports several bugfixes from later releases. It
- includes a fix for TROVE-2020-005, a security issue that could be
- used, under certain cases, by an adversary to observe traffic patterns
- on a limited number of circuits intended for a different relay.
- Please be aware that support for the 0.4.3.x series will end on 15
- February 2021. Please upgrade to 0.4.4.x or 0.4.5.x before then, or
- downgrade to 0.3.5.x, which will be supported until at least 1
- February 2022.
- o Major features (fallback directory list, backport form 0.4.4.3-alpha):
- - Replace the 148 fallback directories originally included in Tor
- 0.4.1.4-rc (of which around 105 are still functional) with a list
- of 144 fallbacks generated in July 2020. Closes ticket 40061.
- o Major bugfixes (security, backport from 0.4.5.1-alpha):
- - When completing a channel, relays now check more thoroughly to
- make sure that it matches any pending circuits before attaching
- those circuits. Previously, address correctness and Ed25519
- identities were not checked in this case, but only when extending
- circuits on an existing channel. Fixes bug 40080; bugfix on
- 0.2.7.2-alpha. Resolves TROVE-2020-005.
- o Major bugfixes (NSS, backport from 0.4.4.3-alpha):
- - When running with NSS enabled, make sure that NSS knows to expect
- nonblocking sockets. Previously, we set our TCP sockets as
- nonblocking, but did not tell NSS, which in turn could lead to
- unexpected blocking behavior. Fixes bug 40035; bugfix
- on 0.3.5.1-alpha.
- o Minor features (security, backport from 0.4.4.4-rc):
- - Channels using obsolete versions of the Tor link protocol are no
- longer allowed to circumvent address-canonicity checks. (This is
- only a minor issue, since such channels have no way to set ed25519
- keys, and therefore should always be rejected for circuits that
- specify ed25519 identities.) Closes ticket 40081.
- o Minor features (subprotocol versions, backport from 0.4.5.1-alpha):
- - Tor no longer allows subprotocol versions larger than 63.
- Previously version numbers up to UINT32_MAX were allowed, which
- significantly complicated our code. Implements proposal 318;
- closes ticket 40133.
- o Minor features (tests, backport from 0.4.4.5):
- - Our "make check" target now runs the unit tests in 8 parallel
- chunks. Doing this speeds up hardened CI builds by more than a
- factor of two. Closes ticket 40098.
- o Minor features (tests, v2 onion services, backport from 0.4.5.1-alpha):
- - Fix a rendezvous cache unit test that was triggering an underflow
- on the global rend cache allocation. Fixes bug 40125; bugfix
- on 0.2.8.1-alpha.
- - Fix another rendezvous cache unit test that was triggering an
- underflow on the global rend cache allocation. Fixes bug 40126;
- bugfix on 0.2.8.1-alpha.
- o Minor bugfixes (correctness, buffers, backport from 0.4.4.4-rc):
- - Fix a correctness bug that could cause an assertion failure if we
- ever tried using the buf_move_all() function with an empty input
- buffer. As far as we know, no released versions of Tor do this.
- Fixes bug 40076; bugfix on 0.3.3.1-alpha.
- o Minor bugfixes (logging, backport from 0.4.5.1-alpha):
- - Remove a debug logging statement that uselessly spammed the logs.
- Fixes bug 40135; bugfix on 0.3.5.0-alpha.
- o Minor bugfixes (rate limiting, bridges, pluggable transports, backport from 0.4.4.4-rc):
- - On a bridge, treat all connections from an ExtORPort as remote by
- default for the purposes of rate-limiting. Previously, bridges
- would treat the connection as local unless they explicitly
- received a "USERADDR" command. ExtORPort connections still count
- as local if there is a USERADDR command with an explicit local
- address. Fixes bug 33747; bugfix on 0.2.5.1-alpha.
- o Minor bugfixes (relay configuration, crash, backport from 0.4.5.1-alpha):
- - Avoid a fatal assert() when failing to create a listener
- connection for an address that was in use. Fixes bug 40073; bugfix
- on 0.3.5.1-alpha.
- o Minor bugfixes (relay, usability, backport from 0.4.4.3-alpha):
- - Adjust the rules for when to warn about having too many
- connections to other relays. Previously we'd tolerate up to 1.5
- connections per relay on average. Now we tolerate more connections
- for directory authorities, and raise the number of total
- connections we need to see before we warn. Fixes bug 33880; bugfix
- on 0.3.1.1-alpha.
- o Minor bugfixes (tests, 0.4.4.5):
- - Fix the behavior of the rend_cache/clean_v2_descs_as_dir when run
- on its own. Previously, it would exit with an error. Fixes bug
- 40099; bugfix on 0.2.8.1-alpha.
- o Minor bugfixes (v2 onion services, backport from 0.4.5.1-alpha):
- - For HSFETCH commands on v2 onion services addresses, check the
- length of bytes decoded, not the base32 length. Fixes bug 34400;
- bugfix on 0.4.1.1-alpha. Patch by Neel Chauhan.
- o Minor bugfixes (windows, backport from 0.4.4.4-rc):
- - Fix a bug that prevented Tor from starting if its log file grew
- above 2GB. Fixes bug 31036; bugfix on 0.2.1.8-alpha.
- o Deprecated features (onion service v2, backport form 0.4.4.2-alpha):
- - Add a deprecation warning for version 2 onion services. Closes
- ticket 40003.
- o Removed features (backport from 0.4.4.3-alpha):
- - Our "check-local" test target no longer tries to use the
- Coccinelle semantic patching tool parse all the C files. While it
- is a good idea to try to make sure Coccinelle works on our C
- before we run a Coccinelle patch, doing so on every test run has
- proven to be disruptive. You can still run this tool manually with
- "make check-cocci". Closes ticket 40030. ticket 40030.
- Changes in version 0.3.5.12 - 2020-11-12
- Tor 0.4.3.7 backports several bugfixes from later releases. It
- includes a fix for TROVE-2020-005, a security issue that could be
- used, under certain cases, by an adversary to observe traffic patterns
- on a limited number of circuits intended for a different relay.
- o Major features (fallback directory list, backport form 0.4.4.3-alpha):
- - Replace the 148 fallback directories originally included in Tor
- 0.4.1.4-rc (of which around 105 are still functional) with a list
- of 144 fallbacks generated in July 2020. Closes ticket 40061.
- o Major bugfixes (security, backport from 0.4.5.1-alpha):
- - When completing a channel, relays now check more thoroughly to
- make sure that it matches any pending circuits before attaching
- those circuits. Previously, address correctness and Ed25519
- identities were not checked in this case, but only when extending
- circuits on an existing channel. Fixes bug 40080; bugfix on
- 0.2.7.2-alpha. Resolves TROVE-2020-005.
- o Major bugfixes (NSS, backport from 0.4.4.3-alpha):
- - When running with NSS enabled, make sure that NSS knows to expect
- nonblocking sockets. Previously, we set our TCP sockets as
- nonblocking, but did not tell NSS, which in turn could lead to
- unexpected blocking behavior. Fixes bug 40035; bugfix
- on 0.3.5.1-alpha.
- o Minor features (security, backport from 0.4.4.4-rc):
- - Channels using obsolete versions of the Tor link protocol are no
- longer allowed to circumvent address-canonicity checks. (This is
- only a minor issue, since such channels have no way to set ed25519
- keys, and therefore should always be rejected for circuits that
- specify ed25519 identities.) Closes ticket 40081.
- o Minor features (debugging, directory system):
- - Don't crash when we find a non-guard with a guard-fraction value
- set. Instead, log a bug warning, in an attempt to figure out how
- this happened. Diagnostic for ticket 32868.
- o Minor features (subprotocol versions, backport from 0.4.5.1-alpha):
- - Tor no longer allows subprotocol versions larger than 63.
- Previously version numbers up to UINT32_MAX were allowed, which
- significantly complicated our code. Implements proposal 318;
- closes ticket 40133.
- o Minor features (tests, backport from 0.4.4.5):
- - Our "make check" target now runs the unit tests in 8 parallel
- chunks. Doing this speeds up hardened CI builds by more than a
- factor of two. Closes ticket 40098.
- o Minor features (tests, v2 onion services, backport from 0.4.5.1-alpha):
- - Fix a rendezvous cache unit test that was triggering an underflow
- on the global rend cache allocation. Fixes bug 40125; bugfix
- on 0.2.8.1-alpha.
- - Fix another rendezvous cache unit test that was triggering an
- underflow on the global rend cache allocation. Fixes bug 40126;
- bugfix on 0.2.8.1-alpha.
- o Minor bugfixes (correctness, buffers, backport from 0.4.4.4-rc):
- - Fix a correctness bug that could cause an assertion failure if we
- ever tried using the buf_move_all() function with an empty input
- buffer. As far as we know, no released versions of Tor do this.
- Fixes bug 40076; bugfix on 0.3.3.1-alpha.
- o Minor bugfixes (logging, backport from 0.4.5.1-alpha):
- - Remove a debug logging statement that uselessly spammed the logs.
- Fixes bug 40135; bugfix on 0.3.5.0-alpha.
- o Minor bugfixes (rate limiting, bridges, pluggable transports, backport from 0.4.4.4-rc):
- - On a bridge, treat all connections from an ExtORPort as remote by
- default for the purposes of rate-limiting. Previously, bridges
- would treat the connection as local unless they explicitly
- received a "USERADDR" command. ExtORPort connections still count
- as local if there is a USERADDR command with an explicit local
- address. Fixes bug 33747; bugfix on 0.2.5.1-alpha.
- o Minor bugfixes (relay configuration, crash, backport from 0.4.5.1-alpha):
- - Avoid a fatal assert() when failing to create a listener
- connection for an address that was in use. Fixes bug 40073; bugfix
- on 0.3.5.1-alpha.
- o Minor bugfixes (relay, usability, backport from 0.4.4.3-alpha):
- - Adjust the rules for when to warn about having too many
- connections to other relays. Previously we'd tolerate up to 1.5
- connections per relay on average. Now we tolerate more connections
- for directory authorities, and raise the number of total
- connections we need to see before we warn. Fixes bug 33880; bugfix
- on 0.3.1.1-alpha.
- o Minor bugfixes (relays, backport from 0.4.4.1-alpha):
- - Stop advertising incorrect IPv6 ORPorts in relay and bridge
- descriptors, when the IPv6 port was configured as "auto". Fixes
- bug 32588; bugfix on 0.2.3.9-alpha.
- o Minor bugfixes (tests, 0.4.4.5):
- - Fix the behavior of the rend_cache/clean_v2_descs_as_dir when run
- on its own. Previously, it would exit with an error. Fixes bug
- 40099; bugfix on 0.2.8.1-alpha.
- o Minor bugfixes (windows, backport from 0.4.4.4-rc):
- - Fix a bug that prevented Tor from starting if its log file grew
- above 2GB. Fixes bug 31036; bugfix on 0.2.1.8-alpha.
- o Deprecated features (onion service v2, backport form 0.4.4.2-alpha):
- - Add a deprecation warning for version 2 onion services. Closes
- ticket 40003.
- Changes in version 0.4.4.5 - 2020-09-15
- Tor 0.4.4.5 is the first stable release in the 0.4.4.x series. This
- series improves our guard selection algorithms, adds v3 onion balance
- support, improves the amount of code that can be disabled when running
- without relay support, and includes numerous small bugfixes and
- enhancements. It also lays the ground for some IPv6 features that
- we'll be developing more in the next (0.4.5) series.
- Per our support policy, we support each stable release series for nine
- months after its first stable release, or three months after the first
- stable release of the next series: whichever is longer. This means
- that 0.4.4.x will be supported until around June 2021--or later, if
- 0.4.5.x is later than anticipated.
- Note also that support for 0.4.2.x has just ended; support for 0.4.3
- will continue until Feb 15, 2021. We still plan to continue supporting
- 0.3.5.x, our long-term stable series, until Feb 2022.
- Below are the changes since 0.4.3.6-rc. For a complete list of changes
- since 0.4.4.4-rc, see the ChangeLog file.
- o Major features (Proposal 310, performance + security):
- - Implements Proposal 310, "Bandaid on guard selection". Proposal
- 310 solves load-balancing issues with older versions of the guard
- selection algorithm, and improves its security. Under this new
- algorithm, a newly selected guard never becomes Primary unless all
- previously sampled guards are unreachable. Implements
- recommendation from 32088. (Proposal 310 is linked to the CLAPS
- project researching optimal client location-aware path selections.
- This project is a collaboration between the UCLouvain Crypto Group,
- the U.S. Naval Research Laboratory, and Princeton University.)
- o Major features (fallback directory list):
- - Replace the 148 fallback directories originally included in Tor
- 0.4.1.4-rc (of which around 105 are still functional) with a list
- of 144 fallbacks generated in July 2020. Closes ticket 40061.
- o Major features (IPv6, relay):
- - Consider IPv6-only EXTEND2 cells valid on relays. Log a protocol
- warning if the IPv4 or IPv6 address is an internal address, and
- internal addresses are not allowed. But continue to use the other
- address, if it is valid. Closes ticket 33817.
- - If a relay can extend over IPv4 and IPv6, and both addresses are
- provided, it chooses between them uniformly at random. Closes
- ticket 33817.
- - Re-use existing IPv6 connections for circuit extends. Closes
- ticket 33817.
- - Relays may extend circuits over IPv6, if the relay has an IPv6
- ORPort, and the client supplies the other relay's IPv6 ORPort in
- the EXTEND2 cell. IPv6 extends will be used by the relay IPv6
- ORPort self-tests in 33222. Closes ticket 33817.
- o Major features (v3 onion services):
- - Allow v3 onion services to act as OnionBalance backend instances,
- by using the HiddenServiceOnionBalanceInstance torrc option.
- Closes ticket 32709.
- o Major bugfixes (NSS):
- - When running with NSS enabled, make sure that NSS knows to expect
- nonblocking sockets. Previously, we set our TCP sockets as
- nonblocking, but did not tell NSS, which in turn could lead to
- unexpected blocking behavior. Fixes bug 40035; bugfix
- on 0.3.5.1-alpha.
- o Major bugfixes (onion services, DoS):
- - Correct handling of parameters for the onion service DoS defense.
- Previously, the consensus parameters for the onion service DoS
- defenses were overwriting the parameters set by the service
- operator using HiddenServiceEnableIntroDoSDefense. Fixes bug
- 40109; bugfix on 0.4.2.1-alpha.
- o Major bugfixes (stats, onion services):
- - Fix a bug where we were undercounting the Tor network's total
- onion service traffic, by ignoring any traffic originating from
- clients. Now we count traffic from both clients and services.
- Fixes bug 40117; bugfix on 0.2.6.2-alpha.
- o Minor features (security):
- - Channels using obsolete versions of the Tor link protocol are no
- longer allowed to circumvent address-canonicity checks. (This is
- only a minor issue, since such channels have no way to set ed25519
- keys, and therefore should always be rejected for circuits that
- specify ed25519 identities.) Closes ticket 40081.
- o Minor features (bootstrap reporting):
- - Report more detailed reasons for bootstrap failure when the
- failure happens due to a TLS error. Previously we would just call
- these errors "MISC" when they happened during read, and "DONE"
- when they happened during any other TLS operation. Closes
- ticket 32622.
- o Minor features (client-only compilation):
- - Disable more code related to the ext_orport protocol when
- compiling without support for relay mode. Closes ticket 33368.
- - Disable more of our self-testing code when support for relay mode
- is disabled. Closes ticket 33370.
- - Most server-side DNS code is now disabled when building without
- support for relay mode. Closes ticket 33366.
- o Minor features (code safety):
- - Check for failures of tor_inet_ntop() and tor_inet_ntoa()
- functions in DNS and IP address processing code, and adjust
- codepaths to make them less likely to crash entire Tor instances.
- Resolves issue 33788.
- o Minor features (continuous integration):
- - Run unit-test and integration test (Stem, Chutney) jobs with
- ALL_BUGS_ARE_FATAL macro being enabled on Travis and Appveyor.
- Resolves ticket 32143.
- o Minor features (control port):
- - If a ClientName was specified in ONION_CLIENT_AUTH_ADD for an
- onion service, display it when we use ONION_CLIENT_AUTH_VIEW.
- Closes ticket 40089. Patch by Neel Chauhan.
- - Return a descriptive error message from the 'GETINFO status/fresh-
- relay-descs' command on the control port. Previously, we returned
- a generic error of "Error generating descriptor". Closes ticket
- 32873. Patch by Neel Chauhan.
- o Minor features (defense in depth):
- - Wipe more data from connection address fields before returning
- them to the memory heap. Closes ticket 6198.
- o Minor features (denial-of-service memory limiter):
- - Allow the user to configure even lower values for the
- MaxMemInQueues parameter. Relays now enforce a minimum of 64 MB,
- when previously the minimum was 256 MB. On clients, there is no
- minimum. Relays and clients will both warn if the value is set so
- low that Tor is likely to stop working. Closes ticket 24308.
- o Minor features (developer tooling):
- - Add a script to help check the alphabetical ordering of option
- names in the manual page. Closes ticket 33339.
- - Refrain from listing all .a files that are generated by the Tor
- build in .gitignore. Add a single wildcard *.a entry that covers
- all of them for present and future. Closes ticket 33642.
- - Add a script ("git-install-tools.sh") to install git hooks and
- helper scripts. Closes ticket 33451.
- o Minor features (directory authority):
- - Authorities now recommend the protocol versions that are supported
- by Tor 0.3.5 and later. (Earlier versions of Tor have been
- deprecated since January of this year.) This recommendation will
- cause older clients and relays to give a warning on startup, or
- when they download a consensus directory. Closes ticket 32696.
- o Minor features (directory authority, shared random):
- - Refactor more authority-only parts of the shared-random scheduling
- code to reside in the dirauth module, and to be disabled when
- compiling with --disable-module-dirauth. Closes ticket 33436.
- o Minor features (directory):
- - Remember the number of bytes we have downloaded for each directory
- purpose while bootstrapping, and while fully bootstrapped. Log
- this information as part of the heartbeat message. Closes
- ticket 32720.
- o Minor features (entry guards):
- - Reinstate support for GUARD NEW/UP/DOWN control port events.
- Closes ticket 40001.
- o Minor features (IPv6 support):
- - Adds IPv6 support to tor_addr_is_valid(). Adds tests for the above
- changes and tor_addr_is_null(). Closes ticket 33679. Patch
- by MrSquanchee.
- - Allow clients and relays to send dual-stack and IPv6-only EXTEND2
- cells. Parse dual-stack and IPv6-only EXTEND2 cells on relays.
- Closes ticket 33901.
- o Minor features (linux seccomp2 sandbox, portability):
- - Allow Tor to build on platforms where it doesn't know how to
- report which syscall caused the linux seccomp2 sandbox to fail.
- This change should make the sandbox code more portable to less
- common Linux architectures. Closes ticket 34382.
- - Permit the unlinkat() syscall, which some Libc implementations use
- to implement unlink(). Closes ticket 33346.
- o Minor features (logging):
- - When trying to find our own address, add debug-level logging to
- report the sources of candidate addresses. Closes ticket 32888.
- o Minor features (onion service client, SOCKS5):
- - Add 3 new SocksPort ExtendedErrors (F2, F3, F7) that reports back
- new type of onion service connection failures. The semantics of
- these error codes are documented in proposal 309. Closes
- ticket 32542.
- o Minor features (onion service v3):
- - If a service cannot upload its descriptor(s), log why at INFO
- level. Closes ticket 33400; bugfix on 0.3.2.1-alpha.
- o Minor features (python scripts):
- - Stop assuming that /usr/bin/python exists. Instead of using a
- hardcoded path in scripts that still use Python 2, use
- /usr/bin/env, similarly to the scripts that use Python 3. Fixes
- bug 33192; bugfix on 0.4.2.
- o Minor features (testing, architecture):
- - Our test scripts now double-check that subsystem initialization
- order is consistent with the inter-module dependencies established
- by our .may_include files. Implements ticket 31634.
- - Initialize all subsystems at the beginning of our unit test
- harness, to avoid crashes due to uninitialized subsystems. Follow-
- up from ticket 33316.
- - Our "make check" target now runs the unit tests in 8 parallel
- chunks. Doing this speeds up hardened CI builds by more than a
- factor of two. Closes ticket 40098.
- o Minor features (v3 onion services):
- - Add v3 onion service status to the dumpstats() call which is
- triggered by a SIGUSR1 signal. Previously, we only did v2 onion
- services. Closes ticket 24844. Patch by Neel Chauhan.
- o Minor features (windows):
- - Add support for console control signals like Ctrl+C in Windows.
- Closes ticket 34211. Patch from Damon Harris (TheDcoder).
- o Minor bugfixes (control port, onion service):
- - Consistently use 'address' in "Invalid v3 address" response to
- ONION_CLIENT_AUTH commands. Previously, we would sometimes say
- 'addr'. Fixes bug 40005; bugfix on 0.4.3.1-alpha.
- o Minor bugfixes (correctness, buffers):
- - Fix a correctness bug that could cause an assertion failure if we
- ever tried using the buf_move_all() function with an empty input
- buffer. As far as we know, no released versions of Tor do this.
- Fixes bug 40076; bugfix on 0.3.3.1-alpha.
- o Minor bugfixes (directory authorities):
- - Directory authorities now reject votes that arrive too late. In
- particular, once an authority has started fetching missing votes,
- it no longer accepts new votes posted by other authorities. This
- change helps prevent a consensus split, where only some authorities
- have the late vote. Fixes bug 4631; bugfix on 0.2.0.5-alpha.
- o Minor bugfixes (git scripts):
- - Stop executing the checked-out pre-commit hook from the pre-push
- hook. Instead, execute the copy in the user's git directory. Fixes
- bug 33284; bugfix on 0.4.1.1-alpha.
- o Minor bugfixes (initialization):
- - Initialize the subsystems in our code in an order more closely
- corresponding to their dependencies, so that every system is
- initialized before the ones that (theoretically) depend on it.
- Fixes bug 33316; bugfix on 0.4.0.1-alpha.
- o Minor bugfixes (IPv4, relay):
- - Check for invalid zero IPv4 addresses and ports when sending and
- receiving extend cells. Fixes bug 33900; bugfix on 0.2.4.8-alpha.
- o Minor bugfixes (IPv6, relay):
- - Consider IPv6 addresses when checking if a connection is
- canonical. In 17604, relays assumed that a remote relay could
- consider an IPv6 connection canonical, but did not set the
- canonical flag on their side of the connection. Fixes bug 33899;
- bugfix on 0.3.1.1-alpha.
- - Log IPv6 addresses on connections where this relay is the
- responder. Previously, responding relays would replace the remote
- IPv6 address with the IPv4 address from the consensus. Fixes bug
- 33899; bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (linux seccomp2 sandbox):
- - Fix a regression on sandboxing rules for the openat() syscall. The
- fix for bug 25440 fixed the problem on systems with glibc >= 2.27
- but broke with versions of glibc. We now choose a rule based on
- the glibc version. Patch from Daniel Pinto. Fixes bug 27315;
- bugfix on 0.3.5.11.
- - Makes the seccomp sandbox allow the correct syscall for opendir
- according to the running glibc version. This fixes crashes when
- reloading torrc with sandbox enabled when running on glibc 2.15 to
- 2.21 and 2.26. Patch from Daniel Pinto. Fixes bug 40020; bugfix
- on 0.3.5.11.
- o Minor bugfixes (logging, testing):
- - Make all of tor's assertion macros support the ALL_BUGS_ARE_FATAL
- and DISABLE_ASSERTS_IN_UNIT_TESTS debugging modes. (IF_BUG_ONCE()
- used to log a non-fatal warning, regardless of the debugging
- mode.) Fixes bug 33917; bugfix on 0.2.9.1-alpha.
- - Remove surprising empty line in the INFO-level log about circuit
- build timeout. Fixes bug 33531; bugfix on 0.3.3.1-alpha.
- o Minor bugfixes (mainloop):
- - Better guard against growing a buffer past its maximum 2GB in
- size. Fixes bug 33131; bugfix on 0.3.0.4-rc.
- o Minor bugfixes (onion service v3 client):
- - Remove a BUG() warning that could occur naturally. Fixes bug
- 34087; bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (onion service, logging):
- - Fix a typo in a log message PublishHidServDescriptors is set to 0.
- Fixes bug 33779; bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (onion services v3):
- - Avoid a non-fatal assertion failure in certain edge-cases when
- opening an intro circuit as a client. Fixes bug 34084; bugfix
- on 0.3.2.1-alpha.
- o Minor bugfixes (protocol versions):
- - Sort tor's supported protocol version lists, as recommended by the
- tor directory specification. Fixes bug 33285; bugfix
- on 0.4.0.1-alpha.
- o Minor bugfixes (rate limiting, bridges, pluggable transports):
- - On a bridge, treat all connections from an ExtORPort as remote by
- default for the purposes of rate-limiting. Previously, bridges
- would treat the connection as local unless they explicitly
- received a "USERADDR" command. ExtORPort connections still count
- as local if there is a USERADDR command with an explicit local
- address. Fixes bug 33747; bugfix on 0.2.5.1-alpha.
- o Minor bugfixes (refactoring):
- - Lift circuit_build_times_disabled() out of the
- circuit_expire_building() loop, to save CPU time when there are
- many circuits open. Fixes bug 33977; bugfix on 0.3.5.9.
- o Minor bugfixes (relay, self-testing):
- - When starting up as a relay, if we haven't been able to verify
- that we're reachable, only launch reachability tests at most once
- a minute. Previously, we had been launching tests up to once a
- second, which was needlessly noisy. Fixes bug 40083; bugfix
- on 0.2.8.1-alpha.
- o Minor bugfixes (relay, usability):
- - Adjust the rules for when to warn about having too many
- connections to other relays. Previously we'd tolerate up to 1.5
- connections per relay on average. Now we tolerate more connections
- for directory authorities, and raise the number of total
- connections we need to see before we warn. Fixes bug 33880; bugfix
- on 0.3.1.1-alpha.
- o Minor bugfixes (SOCKS, onion service client):
- - Detect v3 onion service addresses of the wrong length when
- returning the F6 ExtendedErrors code. Fixes bug 33873; bugfix
- on 0.4.3.1-alpha.
- o Minor bugfixes (tests):
- - Fix the behavior of the rend_cache/clean_v2_descs_as_dir when run
- on its own. Previously, it would exit with an error. Fixes bug
- 40099; bugfix on 0.2.8.1-alpha.
- o Minor bugfixes (v3 onion services):
- - Remove a BUG() warning that could trigger in certain unlikely
- edge-cases. Fixes bug 34086; bugfix on 0.3.2.1-alpha.
- - Remove a BUG() that was causing a stacktrace when a descriptor
- changed at an unexpected time. Fixes bug 28992; bugfix
- on 0.3.2.1-alpha.
- o Minor bugfixes (windows):
- - Fix a bug that prevented Tor from starting if its log file grew
- above 2GB. Fixes bug 31036; bugfix on 0.2.1.8-alpha.
- o Code simplification and refactoring:
- - Define and use a new constant TOR_ADDRPORT_BUF_LEN which is like
- TOR_ADDR_BUF_LEN but includes enough space for an IP address,
- brackets, separating colon, and port number. Closes ticket 33956.
- Patch by Neel Chauhan.
- - Merge the orconn and ocirc events into the "core" subsystem, which
- manages or connections and origin circuits. Previously they were
- isolated in subsystems of their own.
- - Move LOG_PROTOCOL_WARN to app/config. Resolves a dependency
- inversion. Closes ticket 33633.
- - Move the circuit extend code to the relay module. Split the
- circuit extend function into smaller functions. Closes
- ticket 33633.
- - Rewrite port_parse_config() to use the default port flags from
- port_cfg_new(). Closes ticket 32994. Patch by MrSquanchee.
- - Updated comments in 'scheduler.c' to reflect old code changes, and
- simplified the scheduler channel state change code. Closes
- ticket 33349.
- - Refactor configuration parsing to use the new config subsystem
- code. Closes ticket 33014.
- - Move a series of functions related to address resolving into their
- own files. Closes ticket 33789.
- o Documentation:
- - Replace most http:// URLs in our code and documentation with
- https:// URLs. (We have left unchanged the code in src/ext/, and
- the text in LICENSE.) Closes ticket 31812. Patch from Jeremy Rand.
- - Document the limitations of using %include on config files with
- seccomp sandbox enabled. Fixes documentation bug 34133; bugfix on
- 0.3.1.1-alpha. Patch by Daniel Pinto.
- o Removed features:
- - Our "check-local" test target no longer tries to use the
- Coccinelle semantic patching tool parse all the C files. While it
- is a good idea to try to make sure Coccinelle works on our C
- before we run a Coccinelle patch, doing so on every test run has
- proven to be disruptive. You can still run this tool manually with
- "make check-cocci". Closes ticket 40030.
- - Remove the ClientAutoIPv6ORPort option. This option attempted to
- randomly choose between IPv4 and IPv6 for client connections, and
- wasn't a true implementation of Happy Eyeballs. Often, this option
- failed on IPv4-only or IPv6-only connections. Closes ticket 32905.
- Patch by Neel Chauhan.
- - Stop shipping contrib/dist/rc.subr file, as it is not being used
- on FreeBSD anymore. Closes issue 31576.
- o Testing:
- - Add a basic IPv6 test to "make test-network". This test only runs
- when the local machine has an IPv6 stack. Closes ticket 33300.
- - Add test-network-ipv4 and test-network-ipv6 jobs to the Makefile.
- These jobs run the IPv4-only and dual-stack chutney flavours from
- test-network-all. Closes ticket 33280.
- - Remove a redundant distcheck job. Closes ticket 33194.
- - Run the test-network-ipv6 Makefile target in the Travis CI IPv6
- chutney job. This job runs on macOS, so it's a bit slow. Closes
- ticket 33303.
- - Sort the Travis jobs in order of speed. Putting the slowest jobs
- first takes full advantage of Travis job concurrency. Closes
- ticket 33194.
- - Stop allowing the Chutney IPv6 Travis job to fail. This job was
- previously configured to fast_finish (which requires
- allow_failure), to speed up the build. Closes ticket 33195.
- - Test v3 onion services to tor's mixed IPv4 chutney network. And
- add a mixed IPv6 chutney network. These networks are used in the
- test-network-all, test-network-ipv4, and test-network-ipv6 make
- targets. Closes ticket 33334.
- - Use the "bridges+hs-v23" chutney network flavour in "make test-
- network". This test requires a recent version of chutney (mid-
- February 2020). Closes ticket 28208.
- - When a Travis chutney job fails, use chutney's new "diagnostics.sh"
- tool to produce detailed diagnostic output. Closes ticket 32792.
- o Deprecated features (onion service v2):
- - Add a deprecation warning for version 2 onion services. Closes
- ticket 40003.
- o Documentation (manual page):
- - Add cross reference links and a table of contents to the HTML tor
- manual page. Closes ticket 33369. Work by Swati Thacker as part of
- Google Season of Docs.
- - Alphabetize the Denial of Service Mitigation Options, Directory
- Authority Server Options, Hidden Service Options, and Testing
- Network Options sections of the tor(1) manual page. Closes ticket
- 33275. Work by Swati Thacker as part of Google Season of Docs.
- - Refrain from mentioning nicknames in manpage section for MyFamily
- torrc option. Resolves issue 33417.
- - Updated the options set by TestingTorNetwork in the manual page.
- Closes ticket 33778.
- Changes in version 0.3.5.11 - 2020-07-09
- Tor 0.3.5.11 backports fixes from later tor releases, including several
- usability, portability, and reliability fixes.
- This release also fixes TROVE-2020-001, a medium-severity denial of
- service vulnerability affecting all versions of Tor when compiled with
- the NSS encryption library. (This is not the default configuration.)
- Using this vulnerability, an attacker could cause an affected Tor
- instance to crash remotely. This issue is also tracked as CVE-2020-
- 15572. Anybody running a version of Tor built with the NSS library
- should upgrade to 0.3.5.11, 0.4.2.8, 0.4.3.6, or 0.4.4.2-alpha
- or later.
- o Major bugfixes (NSS, security, backport from 0.4.4.2-alpha):
- - Fix a crash due to an out-of-bound memory access when Tor is
- compiled with NSS support. Fixes bug 33119; bugfix on
- 0.3.5.1-alpha. This issue is also tracked as TROVE-2020-001
- and CVE-2020-15572.
- o Major bugfixes (DoS defenses, bridges, pluggable transport, backport from 0.4.3.4-rc):
- - Fix a bug that was preventing DoS defenses from running on bridges
- with a pluggable transport. Previously, the DoS subsystem was not
- given the transport name of the client connection, thus failed to
- find the GeoIP cache entry for that client address. Fixes bug
- 33491; bugfix on 0.3.3.2-alpha.
- o Minor features (testing, backport from 0.4.3.4-rc):
- - The unit tests now support a "TOR_SKIP_TESTCASES" environment
- variable to specify a list of space-separated test cases that
- should not be executed. We will use this to disable certain tests
- that are failing on Appveyor because of mismatched OpenSSL
- libraries. Part of ticket 33643.
- o Minor bugfix (CI, Windows, backport from 0.4.4.2-alpha):
- - Use the correct 64-bit printf format when compiling with MINGW on
- Appveyor. Fixes bug 40026; bugfix on 0.3.5.5-alpha.
- o Minor bugfix (relay, configuration, backport from 0.4.3.3-alpha):
- - Warn if the ContactInfo field is not set, and tell the relay
- operator that not having a ContactInfo field set might cause their
- relay to get rejected in the future. Fixes bug 33361; bugfix
- on 0.1.1.10-alpha.
- o Minor bugfixes (client performance, backport from 0.4.4.1-alpha):
- - Resume use of preemptively-built circuits when UseEntryGuards is set
- to 0. We accidentally disabled this feature with that config
- setting, leading to slower load times. Fixes bug 34303; bugfix
- on 0.3.3.2-alpha.
- o Minor bugfixes (compiler compatibility, backport from 0.4.3.5):
- - Avoid compiler warnings from Clang 10 related to the use of GCC-
- style "/* falls through */" comments. Both Clang and GCC allow
- __attribute__((fallthrough)) instead, so that's what we're using
- now. Fixes bug 34078; bugfix on 0.3.1.3-alpha.
- o Minor bugfixes (compiler warnings, backport from 0.4.4.2-alpha):
- - Fix a compiler warning on platforms with 32-bit time_t values.
- Fixes bug 40028; bugfix on 0.3.2.8-rc.
- o Minor bugfixes (embedded Tor, backport from 0.4.3.1-alpha):
- - When starting Tor any time after the first time in a process,
- register the thread in which it is running as the main thread.
- Previously, we only did this on Windows, which could lead to bugs
- like 23081 on non-Windows platforms. Fixes bug 32884; bugfix
- on 0.3.3.1-alpha.
- o Minor bugfixes (key portability, backport from 0.4.3.4-rc):
- - When reading PEM-encoded key data, tolerate CRLF line-endings even
- if we are not running on Windows. Previously, non-Windows hosts
- would reject these line-endings in certain positions, making
- certain key files hard to move from one host to another. Fixes bug
- 33032; bugfix on 0.3.5.1-alpha.
- o Minor bugfixes (logging, backport from 0.4.4.2-alpha):
- - Downgrade a noisy log message that could occur naturally when
- receiving an extrainfo document that we no longer want. Fixes bug
- 16016; bugfix on 0.2.6.3-alpha.
- o Minor bugfixes (onion service v3, client, backport from 0.4.3.3-alpha):
- - Remove a BUG() warning that would cause a stack trace if an onion
- service descriptor was freed while we were waiting for a
- rendezvous circuit to complete. Fixes bug 28992; bugfix
- on 0.3.2.1-alpha.
- o Testing (CI, backport from 0.4.3.4-rc):
- - In our Appveyor Windows CI, copy required DLLs to test and app
- directories, before running tor's tests. This ensures that tor.exe
- and test*.exe use the correct version of each DLL. This fix is not
- required, but we hope it will avoid DLL search issues in future.
- Fixes bug 33673; bugfix on 0.3.4.2-alpha.
- - On Appveyor, skip the crypto/openssl_version test, which is
- failing because of a mismatched library installation. Fix
- for 33643.
- Changes in version 0.4.2.8 - 2020-07-09
- Tor 0.4.2.8 backports various fixes from later releases, including
- several that affect usability and portability.
- This release also fixes TROVE-2020-001, a medium-severity denial of
- service vulnerability affecting all versions of Tor when compiled with
- the NSS encryption library. (This is not the default configuration.)
- Using this vulnerability, an attacker could cause an affected Tor
- instance to crash remotely. This issue is also tracked as CVE-2020-
- 15572. Anybody running a version of Tor built with the NSS library
- should upgrade to 0.3.5.11, 0.4.2.8, 0.4.3.6, or 0.4.4.2-alpha
- or later.
- o Major bugfixes (NSS, security, backport from 0.4.4.2-alpha):
- - Fix a crash due to an out-of-bound memory access when Tor is
- compiled with NSS support. Fixes bug 33119; bugfix on
- 0.3.5.1-alpha. This issue is also tracked as TROVE-2020-001
- and CVE-2020-15572.
- o Major bugfixes (DoS defenses, bridges, pluggable transport, backport from 0.4.3.4-rc):
- - Fix a bug that was preventing DoS defenses from running on bridges
- with a pluggable transport. Previously, the DoS subsystem was not
- given the transport name of the client connection, thus failed to
- find the GeoIP cache entry for that client address. Fixes bug
- 33491; bugfix on 0.3.3.2-alpha.
- o Minor feature (sendme, flow control, backport form 0.4.3.4-rc):
- - Default to sending SENDME version 1 cells. (Clients are already
- sending these, because of a consensus parameter telling them to do
- so: this change only affects what clients would do if the
- consensus didn't contain a recommendation.) Closes ticket 33623.
- o Minor features (diagnostic, backport from 0.4.3.3-alpha):
- - Improve assertions and add some memory-poisoning code to try to
- track down possible causes of a rare crash (32564) in the EWMA
- code. Closes ticket 33290.
- o Minor features (testing, backport from 0.4.3.4-rc):
- - The unit tests now support a "TOR_SKIP_TESTCASES" environment
- variable to specify a list of space-separated test cases that
- should not be executed. We will use this to disable certain tests
- that are failing on Appveyor because of mismatched OpenSSL
- libraries. Part of ticket 33643.
- o Minor bugfix (CI, Windows, backport from 0.4.4.2-alpha):
- - Use the correct 64-bit printf format when compiling with MINGW on
- Appveyor. Fixes bug 40026; bugfix on 0.3.5.5-alpha.
- o Minor bugfix (relay, configuration, backport from 0.4.3.3-alpha):
- - Warn if the ContactInfo field is not set, and tell the relay
- operator that not having a ContactInfo field set might cause their
- relay to get rejected in the future. Fixes bug 33361; bugfix
- on 0.1.1.10-alpha.
- o Minor bugfixes (client performance, backport from 0.4.4.1-alpha):
- - Resume use of preemptively-built circuits when UseEntryGuards is set
- to 0. We accidentally disabled this feature with that config
- setting, leading to slower load times. Fixes bug 34303; bugfix
- on 0.3.3.2-alpha.
- o Minor bugfixes (compiler compatibility, backport from 0.4.3.5):
- - Avoid compiler warnings from Clang 10 related to the use of GCC-
- style "/* falls through */" comments. Both Clang and GCC allow
- __attribute__((fallthrough)) instead, so that's what we're using
- now. Fixes bug 34078; bugfix on 0.3.1.3-alpha.
- - Fix compilation warnings with GCC 10.0.1. Fixes bug 34077; bugfix
- on 0.4.0.3-alpha.
- o Minor bugfixes (compiler warnings, backport from 0.4.4.2-alpha):
- - Fix a compiler warning on platforms with 32-bit time_t values.
- Fixes bug 40028; bugfix on 0.3.2.8-rc.
- o Minor bugfixes (controller protocol, backport from 0.4.3.2-alpha):
- - When receiving "ACTIVE" or "DORMANT" signals on the control port,
- report them as SIGNAL events. Previously we would log a bug
- warning. Fixes bug 33104; bugfix on 0.4.0.1-alpha.
- o Minor bugfixes (embedded Tor, backport from 0.4.3.1-alpha):
- - When starting Tor any time after the first time in a process,
- register the thread in which it is running as the main thread.
- Previously, we only did this on Windows, which could lead to bugs
- like 23081 on non-Windows platforms. Fixes bug 32884; bugfix
- on 0.3.3.1-alpha.
- o Minor bugfixes (key portability, backport from 0.4.3.4-rc):
- - When reading PEM-encoded key data, tolerate CRLF line-endings even
- if we are not running on Windows. Previously, non-Windows hosts
- would reject these line-endings in certain positions, making
- certain key files hard to move from one host to another. Fixes bug
- 33032; bugfix on 0.3.5.1-alpha.
- o Minor bugfixes (logging, backport from 0.4.3.2-rc):
- - When logging a bug, do not say "Future instances of this warning
- will be silenced" unless we are actually going to silence them.
- Previously we would say this whenever a BUG() check failed in the
- code. Fixes bug 33095; bugfix on 0.4.1.1-alpha.
- o Minor bugfixes (logging, backport from 0.4.3.4-rc):
- - Flush stderr, stdout, and file logs during shutdown, if supported
- by the OS. This change helps make sure that any final logs are
- recorded. Fixes bug 33087; bugfix on 0.4.1.6.
- o Minor bugfixes (logging, backport from 0.4.4.2-alpha):
- - Downgrade a noisy log message that could occur naturally when
- receiving an extrainfo document that we no longer want. Fixes bug
- 16016; bugfix on 0.2.6.3-alpha.
- o Minor bugfixes (onion service v3, client, backport from 0.4.3.3-alpha):
- - Remove a BUG() warning that would cause a stack trace if an onion
- service descriptor was freed while we were waiting for a
- rendezvous circuit to complete. Fixes bug 28992; bugfix
- on 0.3.2.1-alpha.
- o Testing (CI, backport from 0.4.3.4-rc):
- - In our Appveyor Windows CI, copy required DLLs to test and app
- directories, before running tor's tests. This ensures that tor.exe
- and test*.exe use the correct version of each DLL. This fix is not
- required, but we hope it will avoid DLL search issues in future.
- Fixes bug 33673; bugfix on 0.3.4.2-alpha.
- - On Appveyor, skip the crypto/openssl_version test, which is
- failing because of a mismatched library installation. Fix
- for 33643.
- Changes in version 0.4.3.6 - 2020-07-09
- Tor 0.4.3.6 backports several bugfixes from later releases, including
- some affecting usability.
- This release also fixes TROVE-2020-001, a medium-severity denial of
- service vulnerability affecting all versions of Tor when compiled with
- the NSS encryption library. (This is not the default configuration.)
- Using this vulnerability, an attacker could cause an affected Tor
- instance to crash remotely. This issue is also tracked as CVE-2020-
- 15572. Anybody running a version of Tor built with the NSS library
- should upgrade to 0.3.5.11, 0.4.2.8, 0.4.3.6, or 0.4.4.2-alpha
- or later.
- o Major bugfixes (NSS, security, backport from 0.4.4.2-alpha):
- - Fix a crash due to an out-of-bound memory access when Tor is
- compiled with NSS support. Fixes bug 33119; bugfix on
- 0.3.5.1-alpha. This issue is also tracked as TROVE-2020-001
- and CVE-2020-15572.
- o Minor bugfix (CI, Windows, backport from 0.4.4.2-alpha):
- - Use the correct 64-bit printf format when compiling with MINGW on
- Appveyor. Fixes bug 40026; bugfix on 0.3.5.5-alpha.
- o Minor bugfixes (client performance, backport from 0.4.4.1-alpha):
- - Resume use of preemptively-built circuits when UseEntryGuards is set
- to 0. We accidentally disabled this feature with that config
- setting, leading to slower load times. Fixes bug 34303; bugfix
- on 0.3.3.2-alpha.
- o Minor bugfixes (compiler warnings, backport from 0.4.4.2-alpha):
- - Fix a compiler warning on platforms with 32-bit time_t values.
- Fixes bug 40028; bugfix on 0.3.2.8-rc.
- o Minor bugfixes (linux seccomp sandbox, nss, backport from 0.4.4.1-alpha):
- - Fix a startup crash when tor is compiled with --enable-nss and
- sandbox support is enabled. Fixes bug 34130; bugfix on
- 0.3.5.1-alpha. Patch by Daniel Pinto.
- o Minor bugfixes (logging, backport from 0.4.4.2-alpha):
- - Downgrade a noisy log message that could occur naturally when
- receiving an extrainfo document that we no longer want. Fixes bug
- 16016; bugfix on 0.2.6.3-alpha.
- o Minor bugfixes (manual page, backport from 0.4.4.1-alpha):
- - Update the man page to reflect that MinUptimeHidServDirectoryV2
- defaults to 96 hours. Fixes bug 34299; bugfix on 0.2.6.3-alpha.
- o Minor bugfixes (onion service v3, backport from 0.4.4.1-alpha):
- - Prevent an assert() that would occur when cleaning the client
- descriptor cache, and attempting to close circuits for a non-
- decrypted descriptor (lacking client authorization). Fixes bug
- 33458; bugfix on 0.4.2.1-alpha.
- o Minor bugfixes (portability, backport from 0.4.4.1-alpha):
- - Fix a portability error in the configure script, where we were
- using "==" instead of "=". Fixes bug 34233; bugfix on 0.4.3.5.
- o Minor bugfixes (relays, backport from 0.4.4.1-alpha):
- - Stop advertising incorrect IPv6 ORPorts in relay and bridge
- descriptors, when the IPv6 port was configured as "auto". Fixes
- bug 32588; bugfix on 0.2.3.9-alpha.
- o Documentation (backport from 0.4.4.1-alpha):
- - Fix several doxygen warnings related to imbalanced groups. Closes
- ticket 34255.
- Changes in version 0.4.3.5 - 2020-05-15
- Tor 0.4.3.5 is the first stable release in the 0.4.3.x series. This
- series adds support for building without relay code enabled, and
- implements functionality needed for OnionBalance with v3 onion
- services. It includes significant refactoring of our configuration and
- controller functionality, and fixes numerous smaller bugs and
- performance issues.
- Per our support policy, we support each stable release series for nine
- months after its first stable release, or three months after the first
- stable release of the next series: whichever is longer. This means
- that 0.4.3.x will be supported until around February 2021--later, if
- 0.4.4.x is later than anticipated.
- Note also that support for 0.4.1.x is about to end on May 20 of this
- year; 0.4.2.x will be supported until September 15. We still plan to
- continue supporting 0.3.5.x, our long-term stable series, until
- Feb 2022.
- Below are the changes since 0.4.2.6. For a list of only the changes
- since 0.4.3.4-rc, see the ChangeLog file.
- o New system requirements:
- - When building Tor, you now need to have Python 3 in order to run
- the integration tests. (Python 2 is officially unsupported
- upstream, as of 1 Jan 2020.) Closes ticket 32608.
- o Major features (build system):
- - The relay code can now be disabled using the --disable-module-relay
- configure option. When this option is set, we also disable the
- dirauth module. Closes ticket 32123.
- - When Tor is compiled --disable-module-relay, we also omit the code
- used to act as a directory cache. Closes ticket 32487.
- o Major features (directory authority, ed25519):
- - Add support for banning a relay's ed25519 keys in the approved-
- routers file. This will help us migrate away from RSA keys in the
- future. Previously, only RSA keys could be banned in approved-
- routers. Resolves ticket 22029. Patch by Neel Chauhan.
- o Major features (onion services):
- - New control port commands to manage client-side onion service
- authorization credentials. The ONION_CLIENT_AUTH_ADD command adds
- a credential, ONION_CLIENT_AUTH_REMOVE deletes a credential, and
- ONION_CLIENT_AUTH_VIEW lists the credentials. Closes ticket 30381.
- - Introduce a new SocksPort flag, ExtendedErrors, to support more
- detailed error codes in information for applications that support
- them. Closes ticket 30382; implements proposal 304.
- o Major features (proxy):
- - In addition to its current supported proxy types (HTTP CONNECT,
- SOCKS4, and SOCKS5), Tor can now make its OR connections through a
- HAProxy server. A new torrc option was added to specify the
- address/port of the server: TCPProxy <protocol> <host>:<port>.
- Currently the only supported protocol for the option is haproxy.
- Closes ticket 31518. Patch done by Suphanat Chunhapanya (haxxpop).
- o Major bugfixes (security, denial-of-service):
- - Fix a denial-of-service bug that could be used by anyone to
- consume a bunch of CPU on any Tor relay or authority, or by
- directories to consume a bunch of CPU on clients or hidden
- services. Because of the potential for CPU consumption to
- introduce observable timing patterns, we are treating this as a
- high-severity security issue. Fixes bug 33119; bugfix on
- 0.2.1.5-alpha. Found by OSS-Fuzz. We are also tracking this issue
- as TROVE-2020-002 and CVE-2020-10592.
- o Major bugfixes (circuit padding, memory leak):
- - Avoid a remotely triggered memory leak in the case that a circuit
- padding machine is somehow negotiated twice on the same circuit.
- Fixes bug 33619; bugfix on 0.4.0.1-alpha. Found by Tobias Pulls.
- This is also tracked as TROVE-2020-004 and CVE-2020-10593.
- o Major bugfixes (directory authority):
- - Directory authorities will now send a 503 (not enough bandwidth)
- code to clients when under bandwidth pressure. Known relays and
- other authorities will always be answered regardless of the
- bandwidth situation. Fixes bug 33029; bugfix on 0.1.2.5-alpha.
- o Major bugfixes (DoS defenses, bridges, pluggable transport):
- - Fix a bug that was preventing DoS defenses from running on bridges
- with a pluggable transport. Previously, the DoS subsystem was not
- given the transport name of the client connection, thus failed to
- find the GeoIP cache entry for that client address. Fixes bug
- 33491; bugfix on 0.3.3.2-alpha.
- o Major bugfixes (networking):
- - Correctly handle IPv6 addresses in SOCKS5 RESOLVE_PTR requests,
- and accept strings as well as binary addresses. Fixes bug 32315;
- bugfix on 0.3.5.1-alpha.
- o Major bugfixes (onion service):
- - Report HS circuit failure back into the HS subsystem so we take
- appropriate action with regards to the client introduction point
- failure cache. This improves reachability of onion services, since
- now clients notice failing introduction circuits properly. Fixes
- bug 32020; bugfix on 0.3.2.1-alpha.
- o Minor feature (heartbeat, onion service):
- - Add the DoS INTRODUCE2 defenses counter to the heartbeat DoS
- message. Closes ticket 31371.
- o Minor feature (sendme, flow control):
- - Default to sending SENDME version 1 cells. (Clients are already
- sending these, because of a consensus parameter telling them to do
- so: this change only affects what clients would do if the
- consensus didn't contain a recommendation.) Closes ticket 33623.
- o Minor features (best practices tracker):
- - Practracker now supports a --regen-overbroad option to regenerate
- the exceptions file, but only to revise exceptions to be _less_
- tolerant of best-practices violations. Closes ticket 32372.
- o Minor features (configuration validation):
- - Configuration validation can now be done by per-module callbacks,
- rather than a global validation function. This will let us reduce
- the size of config.c and some of its more cumbersome functions.
- Closes ticket 31241.
- o Minor features (configuration):
- - If a configured hardware crypto accelerator in AccelName is
- prefixed with "!", Tor now exits when it cannot be found. Closes
- ticket 32406.
- - We now use flag-driven logic to warn about obsolete configuration
- fields, so that we can include their names. In 0.4.2, we used a
- special type, which prevented us from generating good warnings.
- Implements ticket 32404.
- o Minor features (configure, build system):
- - Output a list of enabled/disabled features at the end of the
- configure process in a pleasing way. Closes ticket 31373.
- o Minor features (continuous integration):
- - Run Doxygen Makefile target on Travis, so we can learn about
- regressions in our internal documentation. Closes ticket 32455.
- - Stop allowing failures on the Travis CI stem tests job. It looks
- like all the stem hangs we were seeing before are now fixed.
- Closes ticket 33075.
- o Minor features (controller):
- - Add stream isolation data to STREAM event. Closes ticket 19859.
- - Implement a new GETINFO command to fetch microdescriptor
- consensus. Closes ticket 31684.
- o Minor features (debugging, directory system):
- - Don't crash when we find a non-guard with a guard-fraction value
- set. Instead, log a bug warning, in an attempt to figure out how
- this happened. Diagnostic for ticket 32868.
- o Minor features (defense in depth):
- - Add additional checks around tor_vasprintf() usage, in case the
- function returns an error. Patch by Tobias Stoeckmann. Fixes
- ticket 31147.
- o Minor features (developer tools):
- - Remove the 0.2.9.x series branches from git scripts (git-merge-
- forward.sh, git-pull-all.sh, git-push-all.sh, git-setup-dirs.sh).
- Closes ticket 32772.
- - Add a check_cocci_parse.sh script that checks that new code is
- parseable by Coccinelle. Add an exceptions file for unparseable
- files, and run the script from travis CI. Closes ticket 31919.
- - Call the check_cocci_parse.sh script from a 'check-cocci' Makefile
- target. Closes ticket 31919.
- - Add a rename_c_identifiers.py tool to rename a bunch of C
- identifiers at once, and generate a well-formed commit message
- describing the change. This should help with refactoring. Closes
- ticket 32237.
- - Add some scripts in "scripts/coccinelle" to invoke the Coccinelle
- semantic patching tool with the correct flags. These flags are
- fairly easy to forget, and these scripts should help us use
- Coccinelle more effectively in the future. Closes ticket 31705.
- o Minor features (diagnostic):
- - Improve assertions and add some memory-poisoning code to try to
- track down possible causes of a rare crash (32564) in the EWMA
- code. Closes ticket 33290.
- o Minor features (directory authorities):
- - Directory authorities now reject descriptors from relays running
- Tor versions from the 0.2.9 and 0.4.0 series. The 0.3.5 series is
- still allowed. Resolves ticket 32672. Patch by Neel Chauhan.
- o Minor features (Doxygen):
- - Update Doxygen configuration file to a more recent template (from
- 1.8.15). Closes ticket 32110.
- - "make doxygen" now works with out-of-tree builds. Closes
- ticket 32113.
- - Make sure that doxygen outputs documentation for all of our C
- files. Previously, some were missing @file declarations, causing
- them to be ignored. Closes ticket 32307.
- - Our "make doxygen" target now respects --enable-fatal-warnings by
- default, and does not warn about items that are missing
- documentation. To warn about missing documentation, run configure
- with the "--enable-missing-doc-warnings" flag: doing so suspends
- fatal warnings for doxygen. Closes ticket 32385.
- o Minor features (git scripts):
- - Add TOR_EXTRA_CLONE_ARGS to git-setup-dirs.sh for git clone
- customisation. Closes ticket 32347.
- - Add git-setup-dirs.sh, which sets up an upstream git repository
- and worktrees for tor maintainers. Closes ticket 29603.
- - Add TOR_EXTRA_REMOTE_* to git-setup-dirs.sh for a custom extra
- remote. Closes ticket 32347.
- - Call the check_cocci_parse.sh script from the git commit and push
- hooks. Closes ticket 31919.
- - Make git-push-all.sh skip unchanged branches when pushing to
- upstream. The script already skipped unchanged test branches.
- Closes ticket 32216.
- - Make git-setup-dirs.sh create a master symlink in the worktree
- directory. Closes ticket 32347.
- - Skip unmodified source files when doing some existing git hook
- checks. Related to ticket 31919.
- o Minor features (IPv6, client):
- - Make Tor clients tell dual-stack exits that they prefer IPv6
- connections. This change is equivalent to setting the PreferIPv6
- flag on SOCKSPorts (and most other listener ports). Tor Browser
- has been setting this flag for some time, and we want to remove a
- client distinguisher at exits. Closes ticket 32637.
- o Minor features (portability, android):
- - When building for Android, disable some tests that depend on $HOME
- and/or pwdb, which Android doesn't have. Closes ticket 32825.
- Patch from Hans-Christoph Steiner.
- o Minor features (relay modularity):
- - Split the relay and server pluggable transport config code into
- separate files in the relay module. Disable this code when the
- relay module is disabled. Closes part of ticket 32213.
- - When the relay module is disabled, reject attempts to set the
- ORPort, DirPort, DirCache, BridgeRelay, ExtORPort, or
- ServerTransport* options, rather than ignoring the values of these
- options. Closes part of ticket 32213.
- - When the relay module is disabled, change the default config so
- that DirCache is 0, and ClientOnly is 1. Closes ticket 32410.
- o Minor features (release tools):
- - Port our ChangeLog formatting and sorting tools to Python 3.
- Closes ticket 32704.
- o Minor features (testing):
- - The unit tests now support a "TOR_SKIP_TESTCASES" environment
- variable to specify a list of space-separated test cases that
- should not be executed. We will use this to disable certain tests
- that are failing on Appveyor because of mismatched OpenSSL
- libraries. Part of ticket 33643.
- - Detect some common failure cases for test_parseconf.sh in
- src/test/conf_failures. Closes ticket 32451.
- - Allow test_parseconf.sh to test expected log outputs for successful
- configs, as well as failed configs. Closes ticket 32451.
- - The test_parseconf.sh script now supports result variants for any
- combination of the optional libraries lzma, nss, and zstd. Closes
- ticket 32397.
- - When running the unit tests on Android, create temporary files in
- a subdirectory of /data/local/tmp. Closes ticket 32172. Based on a
- patch from Hans-Christoph Steiner.
- o Minor features (usability):
- - Include more information when failing to parse a configuration
- value. This should make it easier to tell what's going wrong when
- a configuration file doesn't parse. Closes ticket 33460.
- o Minor bugfix (relay, configuration):
- - Warn if the ContactInfo field is not set, and tell the relay
- operator that not having a ContactInfo field set might cause their
- relay to get rejected in the future. Fixes bug 33361; bugfix
- on 0.1.1.10-alpha.
- o Minor bugfixes (bridges):
- - Lowercase the configured value of BridgeDistribution before adding
- it to the descriptor. Fixes bug 32753; bugfix on 0.3.2.3-alpha.
- o Minor bugfixes (build system):
- - Fix "make autostyle" for out-of-tree builds. Fixes bug 32370;
- bugfix on 0.4.1.2-alpha.
- o Minor bugfixes (compiler compatibility):
- - Avoid compiler warnings from Clang 10 related to the use of GCC-
- style "/* falls through */" comments. Both Clang and GCC allow
- __attribute__((fallthrough)) instead, so that's what we're using
- now. Fixes bug 34078; bugfix on 0.3.1.3-alpha.
- - Fix compilation warnings with GCC 10.0.1. Fixes bug 34077; bugfix
- on 0.4.0.3-alpha.
- o Minor bugfixes (configuration handling):
- - Make control_event_conf_changed() take in a config_line_t instead
- of a smartlist of alternating key/value entries. Fixes bug 31531;
- bugfix on 0.2.3.3-alpha. Patch by Neel Chauhan.
- - Check for multiplication overflow when parsing memory units inside
- configuration. Fixes bug 30920; bugfix on 0.0.9rc1.
- - When dumping the configuration, stop adding a trailing space after
- the option name when there is no option value. This issue only
- affects options that accept an empty value or list. (Most options
- reject empty values, or delete the entire line from the dumped
- options.) Fixes bug 32352; bugfix on 0.0.9pre6.
- - Avoid changing the user's value of HardwareAccel as stored by
- SAVECONF, when AccelName is set but HardwareAccel is not. Fixes
- bug 32382; bugfix on 0.2.2.1-alpha.
- - When creating a KeyDirectory with the same location as the
- DataDirectory (not recommended), respect the DataDirectory's
- group-readable setting if one has not been set for the
- KeyDirectory. Fixes bug 27992; bugfix on 0.3.3.1-alpha.
- o Minor bugfixes (continuous integration):
- - Remove the buggy and unused mirroring job. Fixes bug 33213; bugfix
- on 0.3.2.2-alpha.
- o Minor bugfixes (controller protocol):
- - When receiving "ACTIVE" or "DORMANT" signals on the control port,
- report them as SIGNAL events. Previously we would log a bug
- warning. Fixes bug 33104; bugfix on 0.4.0.1-alpha.
- o Minor bugfixes (controller):
- - In routerstatus_has_changed(), check all the fields that are
- output over the control port. Fixes bug 20218; bugfix
- on 0.1.1.11-alpha.
- o Minor bugfixes (developer tools):
- - Allow paths starting with ./ in scripts/add_c_file.py. Fixes bug
- 31336; bugfix on 0.4.1.2-alpha.
- o Minor bugfixes (dirauth module):
- - Split the dirauth config code into a separate file in the dirauth
- module. Disable this code when the dirauth module is disabled.
- Closes ticket 32213.
- - When the dirauth module is disabled, reject attempts to set the
- AuthoritativeDir option, rather than ignoring the value of the
- option. Fixes bug 32213; bugfix on 0.3.4.1-alpha.
- o Minor bugfixes (embedded Tor):
- - When starting Tor any time after the first time in a process,
- register the thread in which it is running as the main thread.
- Previously, we only did this on Windows, which could lead to bugs
- like 23081 on non-Windows platforms. Fixes bug 32884; bugfix
- on 0.3.3.1-alpha.
- o Minor bugfixes (git scripts):
- - Avoid sleeping before the last push in git-push-all.sh. Closes
- ticket 32216.
- - Forward all unrecognised arguments in git-push-all.sh to git push.
- Closes ticket 32216.
- o Minor bugfixes (key portability):
- - When reading PEM-encoded key data, tolerate CRLF line-endings even
- if we are not running on Windows. Previously, non-Windows hosts
- would reject these line-endings in certain positions, making
- certain key files hard to move from one host to another. Fixes bug
- 33032; bugfix on 0.3.5.1-alpha.
- o Minor bugfixes (logging):
- - Stop truncating IPv6 addresses and ports in channel and connection
- logs. Fixes bug 33918; bugfix on 0.2.4.4-alpha.
- - Flush stderr, stdout, and file logs during shutdown, if supported
- by the OS. This change helps make sure that any final logs are
- recorded. Fixes bug 33087; bugfix on 0.4.1.6.
- - Stop closing stderr and stdout during shutdown. Closing these file
- descriptors can hide sanitiser logs. Fixes bug 33087; bugfix
- on 0.4.1.6.
- - If we encounter a bug when flushing a buffer to a TLS connection,
- only log the bug once per invocation of the Tor process.
- Previously we would log with every occurrence, which could cause
- us to run out of disk space. Fixes bug 33093; bugfix
- on 0.3.2.2-alpha.
- - When logging a bug, do not say "Future instances of this warning
- will be silenced" unless we are actually going to silence them.
- Previously we would say this whenever a BUG() check failed in the
- code. Fixes bug 33095; bugfix on 0.4.1.1-alpha.
- o Minor bugfixes (onion services v2):
- - Move a series of v2 onion service warnings to protocol-warning
- level because they can all be triggered remotely by a malformed
- request. Fixes bug 32706; bugfix on 0.1.1.14-alpha.
- - When sending the INTRO cell for a v2 Onion Service, look at the
- failure cache alongside timeout values to check if the intro point
- is marked as failed. Previously, we only looked at the relay
- timeout values. Fixes bug 25568; bugfix on 0.2.7.3-rc. Patch by
- Neel Chauhan.
- o Minor bugfixes (onion services v3):
- - Remove a BUG() warning that would cause a stack trace if an onion
- service descriptor was freed while we were waiting for a
- rendezvous circuit to complete. Fixes bug 28992; bugfix
- on 0.3.2.1-alpha.
- - Relax severity of a log message that can appear naturally when
- decoding onion service descriptors as a relay. Also add some
- diagnostics to debug any future bugs in that area. Fixes bug
- 31669; bugfix on 0.3.0.1-alpha.
- - Fix an assertion failure that could result from a corrupted
- ADD_ONION control port command. Found by Saibato. Fixes bug 33137;
- bugfix on 0.3.3.1-alpha. This issue is also tracked
- as TROVE-2020-003.
- - Properly handle the client rendezvous circuit timeout. Previously
- Tor would sometimes timeout a rendezvous circuit awaiting the
- introduction ACK, and find itself unable to re-establish all
- circuits because the rendezvous circuit timed out too early. Fixes
- bug 32021; bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (onion services):
- - Do not rely on a "circuit established" flag for intro circuits but
- instead always query the HS circuit map. This is to avoid sync
- issue with that flag and the map. Fixes bug 32094; bugfix
- on 0.3.2.1-alpha.
- o Minor bugfixes (onion services, all):
- - In cancel_descriptor_fetches(), use
- connection_list_by_type_purpose() instead of
- connection_list_by_type_state(). Fixes bug 32639; bugfix on
- 0.3.2.1-alpha. Patch by Neel Chauhan.
- o Minor bugfixes (pluggable transports):
- - When receiving a message on standard error from a pluggable
- transport, log it at info level, rather than as a warning. Fixes
- bug 33005; bugfix on 0.4.0.1-alpha.
- o Minor bugfixes (rust, build):
- - Fix a syntax warning given by newer versions of Rust that was
- creating problems for our continuous integration. Fixes bug 33212;
- bugfix on 0.3.5.1-alpha.
- o Minor bugfixes (scripts):
- - Fix update_versions.py for out-of-tree builds. Fixes bug 32371;
- bugfix on 0.4.0.1-alpha.
- o Minor bugfixes (testing):
- - Use the same code to find the tor binary in all of our test
- scripts. This change makes sure we are always using the coverage
- binary when coverage is enabled. Fixes bug 32368; bugfix
- on 0.2.7.3-rc.
- - Stop ignoring "tor --dump-config" errors in test_parseconf.sh.
- Fixes bug 32468; bugfix on 0.4.2.1-alpha.
- - Our option-validation tests no longer depend on specially
- configured non-default, non-passing sets of options. Previously,
- the tests had been written to assume that options would _not_ be
- set to their defaults, which led to needless complexity and
- verbosity. Fixes bug 32175; bugfix on 0.2.8.1-alpha.
- o Minor bugfixes (TLS bug handling):
- - When encountering a bug in buf_read_from_tls(), return a "MISC"
- error code rather than "WANTWRITE". This change might help avoid
- some CPU-wasting loops if the bug is ever triggered. Bug reported
- by opara. Fixes bug 32673; bugfix on 0.3.0.4-alpha.
- o Deprecated features:
- - Deprecate the ClientAutoIPv6ORPort option. This option was not
- true "Happy Eyeballs", and often failed on connections that
- weren't reliably dual-stack. Closes ticket 32942. Patch by
- Neel Chauhan.
- o Documentation:
- - Provide a quickstart guide for a Circuit Padding Framework, and
- documentation for researchers to implement and study circuit
- padding machines. Closes ticket 28804.
- - Add documentation in 'HelpfulTools.md' to describe how to build a
- tag file. Closes ticket 32779.
- - Create a high-level description of the long-term software
- architecture goals. Closes ticket 32206.
- - Describe the --dump-config command in the manual page. Closes
- ticket 32467.
- - Unite coding advice from this_not_that.md in torguts repo into our
- coding standards document. Resolves ticket 31853.
- o Removed features:
- - Our Doxygen configuration no longer generates LaTeX output. The
- reference manual produced by doing this was over 4000 pages long,
- and generally unusable. Closes ticket 32099.
- - The option "TestingEstimatedDescriptorPropagationTime" is now
- marked as obsolete. It has had no effect since 0.3.0.7, when
- clients stopped rejecting consensuses "from the future". Closes
- ticket 32807.
- - We no longer support consensus methods before method 28; these
- methods were only used by authorities running versions of Tor that
- are now at end-of-life. In effect, this means that clients,
- relays, and authorities now assume that authorities will be
- running version 0.3.5.x or later. Closes ticket 32695.
- o Testing:
- - Avoid conflicts between the fake sockets in tor's unit tests, and
- real file descriptors. Resolves issues running unit tests with
- GitHub Actions, where the process that embeds or launches the
- tests has already opened a large number of file descriptors. Fixes
- bug 33782; bugfix on 0.2.8.1-alpha. Found and fixed by
- Putta Khunchalee.
- - Add more test cases for tor's UTF-8 validation function. Also,
- check the arguments passed to the function for consistency. Closes
- ticket 32845.
- - Improve test coverage for relay and dirauth config code, focusing
- on option validation and normalization. Closes ticket 32213.
- - Improve the consistency of test_parseconf.sh output, and run all
- the tests, even if one fails. Closes ticket 32213.
- - Run the practracker unit tests in the pre-commit git hook. Closes
- ticket 32609.
- o Code simplification and refactoring (channel):
- - Channel layer had a variable length cell handler that was not used
- and thus removed. Closes ticket 32892.
- o Code simplification and refactoring (configuration):
- - Immutability is now implemented as a flag on individual
- configuration options rather than as part of the option-transition
- checking code. Closes ticket 32344.
- - Instead of keeping a list of configuration options to check for
- relative paths, check all the options whose type is "FILENAME".
- Solves part of ticket 32339.
- - Our default log (which ordinarily sends NOTICE-level messages to
- standard output) is now handled in a more logical manner.
- Previously, we replaced the configured log options if they were
- empty. Now, we interpret an empty set of log options as meaning
- "use the default log". Closes ticket 31999.
- - Remove some unused arguments from the options_validate() function,
- to simplify our code and tests. Closes ticket 32187.
- - Simplify the options_validate() code so that it looks at the
- default options directly, rather than taking default options as an
- argument. This change lets us simplify its interface. Closes
- ticket 32185.
- - Use our new configuration architecture to move most authority-
- related options to the directory authority module. Closes
- ticket 32806.
- - When parsing the command line, handle options that determine our
- "quiet level" and our mode of operation (e.g., --dump-config and
- so on) all in one table. Closes ticket 32003.
- o Code simplification and refactoring (controller):
- - Create a new abstraction for formatting control protocol reply
- lines based on key-value pairs. Refactor some existing control
- protocol code to take advantage of this. Closes ticket 30984.
- - Create a helper function that can fetch network status or
- microdesc consensuses. Closes ticket 31684.
- o Code simplification and refactoring (dirauth modularization):
- - Remove the last remaining HAVE_MODULE_DIRAUTH inside a function.
- Closes ticket 32163.
- - Replace some confusing identifiers in process_descs.c. Closes
- ticket 29826.
- - Simplify some relay and dirauth config code. Closes ticket 32213.
- o Code simplification and refactoring (mainloop):
- - Simplify the ip_address_changed() function by removing redundant
- checks. Closes ticket 33091.
- o Code simplification and refactoring (misc):
- - Make all the structs we declare follow the same naming convention
- of ending with "_t". Closes ticket 32415.
- - Move and rename some configuration-related code for clarity.
- Closes ticket 32304.
- - Our include.am files are now broken up by subdirectory.
- Previously, src/core/include.am covered all of the subdirectories
- in "core", "feature", and "app". Closes ticket 32137.
- - Remove underused NS*() macros from test code: they make our tests
- more confusing, especially for code-formatting tools. Closes
- ticket 32887.
- o Code simplification and refactoring (relay modularization):
- - Disable relay_periodic when the relay module is disabled. Closes
- ticket 32244.
- - Disable relay_sys when the relay module is disabled. Closes
- ticket 32245.
- o Code simplification and refactoring (tool support):
- - Add numerous missing dependencies to our include files, so that
- they can be included in different reasonable orders and still
- compile. Addresses part of ticket 32764.
- - Fix some parts of our code that were difficult for Coccinelle to
- parse. Related to ticket 31705.
- - Fix some small issues in our code that prevented automatic
- formatting tools from working. Addresses part of ticket 32764.
- o Documentation (manpage):
- - Alphabetize the Server and Directory server sections of the tor
- manpage. Also split Statistics options into their own section of
- the manpage. Closes ticket 33188. Work by Swati Thacker as part of
- Google Season of Docs.
- - Document the __OwningControllerProcess torrc option and specify
- its polling interval. Resolves issue 32971.
- - Split "Circuit Timeout" options and "Node Selection" options into
- their own sections of the tor manpage. Closes tickets 32928 and
- 32929. Work by Swati Thacker as part of Google Season of Docs.
- - Alphabetize the Client Options section of the tor manpage. Closes
- ticket 32846.
- - Alphabetize the General Options section of the tor manpage. Closes
- ticket 32708.
- - In the tor(1) manpage, reword and improve formatting of the
- COMMAND-LINE OPTIONS and DESCRIPTION sections. Closes ticket
- 32277. Based on work by Swati Thacker as part of Google Season
- of Docs.
- - In the tor(1) manpage, reword and improve formatting of the FILES,
- SEE ALSO, and BUGS sections. Closes ticket 32176. Based on work by
- Swati Thacker as part of Google Season of Docs.
- o Testing (Appveyor CI):
- - In our Appveyor Windows CI, copy required DLLs to test and app
- directories, before running tor's tests. This ensures that tor.exe
- and test*.exe use the correct version of each DLL. This fix is not
- required, but we hope it will avoid DLL search issues in future.
- Fixes bug 33673; bugfix on 0.3.4.2-alpha.
- - On Appveyor, skip the crypto/openssl_version test, which is
- failing because of a mismatched library installation. Fix
- for 33643.
- o Testing (circuit, EWMA):
- - Add unit tests for circuitmux and EWMA subsystems. Closes
- ticket 32196.
- o Testing (Travis CI):
- - Remove a redundant distcheck job. Closes ticket 33194.
- - Sort the Travis jobs in order of speed: putting the slowest jobs
- first takes full advantage of Travis job concurrency. Closes
- ticket 33194.
- - Stop allowing the Chutney IPv6 Travis job to fail. This job was
- previously configured to fast_finish (which requires
- allow_failure), to speed up the build. Closes ticket 33195.
- - When a Travis chutney job fails, use chutney's new "diagnostics.sh"
- tool to produce detailed diagnostic output. Closes ticket 32792.
- Changes in version 0.4.2.7 - 2020-03-18
- This is the third stable release in the 0.4.2.x series. It backports
- numerous fixes from later releases, including a fix for TROVE-2020-
- 002, a major denial-of-service vulnerability that affected all
- released Tor instances since 0.2.1.5-alpha. Using this vulnerability,
- an attacker could cause Tor instances to consume a huge amount of CPU,
- disrupting their operations for several seconds or minutes. This
- attack could be launched by anybody against a relay, or by a directory
- cache against any client that had connected to it. The attacker could
- launch this attack as much as they wanted, thereby disrupting service
- or creating patterns that could aid in traffic analysis. This issue
- was found by OSS-Fuzz, and is also tracked as CVE-2020-10592.
- We do not have reason to believe that this attack is currently being
- exploited in the wild, but nonetheless we advise everyone to upgrade
- as soon as packages are available.
- o Major bugfixes (security, denial-of-service, backport from 0.4.3.3-alpha):
- - Fix a denial-of-service bug that could be used by anyone to
- consume a bunch of CPU on any Tor relay or authority, or by
- directories to consume a bunch of CPU on clients or hidden
- services. Because of the potential for CPU consumption to
- introduce observable timing patterns, we are treating this as a
- high-severity security issue. Fixes bug 33119; bugfix on
- 0.2.1.5-alpha. Found by OSS-Fuzz. We are also tracking this issue
- as TROVE-2020-002 and CVE-2020-10592.
- o Major bugfixes (circuit padding, memory leak, backport from 0.4.3.3-alpha):
- - Avoid a remotely triggered memory leak in the case that a circuit
- padding machine is somehow negotiated twice on the same circuit.
- Fixes bug 33619; bugfix on 0.4.0.1-alpha. Found by Tobias Pulls.
- This is also tracked as TROVE-2020-004 and CVE-2020-10593.
- o Major bugfixes (directory authority, backport from 0.4.3.3-alpha):
- - Directory authorities will now send a 503 (not enough bandwidth)
- code to clients when under bandwidth pressure. Known relays and
- other authorities will always be answered regardless of the
- bandwidth situation. Fixes bug 33029; bugfix on 0.1.2.5-alpha.
- o Minor features (continuous integration, backport from 0.4.3.2-alpha):
- - Stop allowing failures on the Travis CI stem tests job. It looks
- like all the stem hangs we were seeing before are now fixed.
- Closes ticket 33075.
- o Minor bugfixes (bridges, backport from 0.4.3.1-alpha):
- - Lowercase the configured value of BridgeDistribution before adding
- it to the descriptor. Fixes bug 32753; bugfix on 0.3.2.3-alpha.
- o Minor bugfixes (logging, backport from 0.4.3.2-alpha):
- - If we encounter a bug when flushing a buffer to a TLS connection,
- only log the bug once per invocation of the Tor process.
- Previously we would log with every occurrence, which could cause
- us to run out of disk space. Fixes bug 33093; bugfix
- on 0.3.2.2-alpha.
- o Minor bugfixes (onion services v3, backport from 0.4.3.3-alpha):
- - Fix an assertion failure that could result from a corrupted
- ADD_ONION control port command. Found by Saibato. Fixes bug 33137;
- bugfix on 0.3.3.1-alpha. This issue is also tracked
- as TROVE-2020-003.
- o Minor bugfixes (rust, build, backport from 0.4.3.2-alpha):
- - Fix a syntax warning given by newer versions of Rust that was
- creating problems for our continuous integration. Fixes bug 33212;
- bugfix on 0.3.5.1-alpha.
- o Testing (Travis CI, backport from 0.4.3.3-alpha):
- - Remove a redundant distcheck job. Closes ticket 33194.
- - Sort the Travis jobs in order of speed: putting the slowest jobs
- first takes full advantage of Travis job concurrency. Closes
- ticket 33194.
- - Stop allowing the Chutney IPv6 Travis job to fail. This job was
- previously configured to fast_finish (which requires
- allow_failure), to speed up the build. Closes ticket 33195.
- - When a Travis chutney job fails, use chutney's new "diagnostics.sh"
- tool to produce detailed diagnostic output. Closes ticket 32792.
- Changes in version 0.4.1.9 - 2020-03-18
- Tor 0.4.1.9 backports important fixes from later Tor releases,
- including a fix for TROVE-2020-002, a major denial-of-service
- vulnerability that affected all released Tor instances since
- 0.2.1.5-alpha. Using this vulnerability, an attacker could cause Tor
- instances to consume a huge amount of CPU, disrupting their operations
- for several seconds or minutes. This attack could be launched by
- anybody against a relay, or by a directory cache against any client
- that had connected to it. The attacker could launch this attack as
- much as they wanted, thereby disrupting service or creating patterns
- that could aid in traffic analysis. This issue was found by OSS-Fuzz,
- and is also tracked as CVE-2020-10592.
- We do not have reason to believe that this attack is currently being
- exploited in the wild, but nonetheless we advise everyone to upgrade
- as soon as packages are available.
- o Major bugfixes (security, denial-of-service, backport from 0.4.3.3-alpha):
- - Fix a denial-of-service bug that could be used by anyone to
- consume a bunch of CPU on any Tor relay or authority, or by
- directories to consume a bunch of CPU on clients or hidden
- services. Because of the potential for CPU consumption to
- introduce observable timing patterns, we are treating this as a
- high-severity security issue. Fixes bug 33119; bugfix on
- 0.2.1.5-alpha. Found by OSS-Fuzz. We are also tracking this issue
- as TROVE-2020-002 and CVE-2020-10592.
- o Major bugfixes (circuit padding, memory leak, backport from 0.4.3.3-alpha):
- - Avoid a remotely triggered memory leak in the case that a circuit
- padding machine is somehow negotiated twice on the same circuit.
- Fixes bug 33619; bugfix on 0.4.0.1-alpha. Found by Tobias Pulls.
- This is also tracked as TROVE-2020-004 and CVE-2020-10593.
- o Minor bugfixes (bridges, backport from 0.4.3.1-alpha):
- - Lowercase the configured value of BridgeDistribution before adding
- it to the descriptor. Fixes bug 32753; bugfix on 0.3.2.3-alpha.
- o Minor bugfixes (logging, backport from 0.4.3.2-alpha):
- - If we encounter a bug when flushing a buffer to a TLS connection,
- only log the bug once per invocation of the Tor process.
- Previously we would log with every occurrence, which could cause
- us to run out of disk space. Fixes bug 33093; bugfix
- on 0.3.2.2-alpha.
- o Minor bugfixes (onion services v3, backport from 0.4.3.3-alpha):
- - Fix an assertion failure that could result from a corrupted
- ADD_ONION control port command. Found by Saibato. Fixes bug 33137;
- bugfix on 0.3.3.1-alpha. This issue is also tracked
- as TROVE-2020-003.
- o Minor bugfixes (rust, build, backport from 0.4.3.2-alpha):
- - Fix a syntax warning given by newer versions of Rust that was
- creating problems for our continuous integration. Fixes bug 33212;
- bugfix on 0.3.5.1-alpha.
- o Testing (Travis CI, backport from 0.4.3.3-alpha):
- - Remove a redundant distcheck job. Closes ticket 33194.
- - Sort the Travis jobs in order of speed: putting the slowest jobs
- first takes full advantage of Travis job concurrency. Closes
- ticket 33194.
- - Stop allowing the Chutney IPv6 Travis job to fail. This job was
- previously configured to fast_finish (which requires
- allow_failure), to speed up the build. Closes ticket 33195.
- - When a Travis chutney job fails, use chutney's new "diagnostics.sh"
- tool to produce detailed diagnostic output. Closes ticket 32792.
- Changes in version 0.3.5.10 - 2020-03-18
- Tor 0.3.5.10 backports many fixes from later Tor releases, including a
- fix for TROVE-2020-002, a major denial-of-service vulnerability that
- affected all released Tor instances since 0.2.1.5-alpha. Using this
- vulnerability, an attacker could cause Tor instances to consume a huge
- amount of CPU, disrupting their operations for several seconds or
- minutes. This attack could be launched by anybody against a relay, or
- by a directory cache against any client that had connected to it. The
- attacker could launch this attack as much as they wanted, thereby
- disrupting service or creating patterns that could aid in traffic
- analysis. This issue was found by OSS-Fuzz, and is also tracked
- as CVE-2020-10592.
- We do not have reason to believe that this attack is currently being
- exploited in the wild, but nonetheless we advise everyone to upgrade
- as soon as packages are available.
- o Major bugfixes (security, denial-of-service, backport from 0.4.3.3-alpha):
- - Fix a denial-of-service bug that could be used by anyone to
- consume a bunch of CPU on any Tor relay or authority, or by
- directories to consume a bunch of CPU on clients or hidden
- services. Because of the potential for CPU consumption to
- introduce observable timing patterns, we are treating this as a
- high-severity security issue. Fixes bug 33119; bugfix on
- 0.2.1.5-alpha. Found by OSS-Fuzz. We are also tracking this issue
- as TROVE-2020-002 and CVE-2020-10592.
- o Major bugfixes (linux seccomp sandbox, backport from 0.4.3.1-alpha):
- - Correct how we use libseccomp. Particularly, stop assuming that
- rules are applied in a particular order or that more rules are
- processed after the first match. Neither is the case! In
- libseccomp <2.4.0 this lead to some rules having no effect.
- libseccomp 2.4.0 changed how rules are generated, leading to a
- different ordering, which in turn led to a fatal crash during
- startup. Fixes bug 29819; bugfix on 0.2.5.1-alpha. Patch by
- Peter Gerber.
- o Minor features (continuous integration, backport from 0.4.3.2-alpha):
- - Stop allowing failures on the Travis CI stem tests job. It looks
- like all the stem hangs we were seeing before are now fixed.
- Closes ticket 33075.
- o Minor bugfixes (bridges, backport from 0.4.3.1-alpha):
- - Lowercase the configured value of BridgeDistribution before adding
- it to the descriptor. Fixes bug 32753; bugfix on 0.3.2.3-alpha.
- o Minor bugfixes (crash, backport from 0.4.2.4-rc):
- - When running Tor with an option like --verify-config or
- --dump-config that does not start the event loop, avoid crashing
- if we try to exit early because of an error. Fixes bug 32407;
- bugfix on 0.3.3.1-alpha.
- o Minor bugfixes (logging, backport from 0.4.3.2-alpha):
- - If we encounter a bug when flushing a buffer to a TLS connection,
- only log the bug once per invocation of the Tor process.
- Previously we would log with every occurrence, which could cause
- us to run out of disk space. Fixes bug 33093; bugfix
- on 0.3.2.2-alpha.
- o Minor bugfixes (onion services v3, backport from 0.4.3.3-alpha):
- - Fix an assertion failure that could result from a corrupted
- ADD_ONION control port command. Found by Saibato. Fixes bug 33137;
- bugfix on 0.3.3.1-alpha. This issue is also tracked
- as TROVE-2020-003.
- o Minor bugfixes (rust, build, backport from 0.4.3.2-alpha):
- - Fix a syntax warning given by newer versions of Rust that was
- creating problems for our continuous integration. Fixes bug 33212;
- bugfix on 0.3.5.1-alpha.
- o Testing (backport from 0.4.3.1-alpha):
- - Re-enable the Travis CI macOS Chutney build, but don't let it
- prevent the Travis job from finishing. (The Travis macOS jobs are
- slow, so we don't want to have it delay the whole CI process.)
- Closes ticket 32629.
- - Turn off Tor's Sandbox in Chutney jobs, and run those jobs on
- Ubuntu Bionic. Turning off the Sandbox is a work-around, until we
- fix the sandbox errors in 32722. Closes ticket 32240.
- o Testing (continuous integration, backport from 0.4.3.1-alpha):
- - Use zstd in our Travis Linux builds. Closes ticket 32242.
- o Testing (Travis CI, backport from 0.4.3.3-alpha):
- - Remove a redundant distcheck job. Closes ticket 33194.
- - Sort the Travis jobs in order of speed: putting the slowest jobs
- first takes full advantage of Travis job concurrency. Closes
- ticket 33194.
- - Stop allowing the Chutney IPv6 Travis job to fail. This job was
- previously configured to fast_finish (which requires
- - When a Travis chutney job fails, use chutney's new "diagnostics.sh"
- tool to produce detailed diagnostic output. Closes ticket 32792.
- Changes in version 0.4.2.6 - 2020-01-30
- This is the second stable release in the 0.4.2.x series. It backports
- several bugfixes from 0.4.3.1-alpha, including some that had affected
- the Linux seccomp2 sandbox or Windows services. If you're running with
- one of those configurations, you'll probably want to upgrade;
- otherwise, you should be fine with 0.4.2.5.
- o Major bugfixes (linux seccomp sandbox, backport from 0.4.3.1-alpha):
- - Correct how we use libseccomp. Particularly, stop assuming that
- rules are applied in a particular order or that more rules are
- processed after the first match. Neither is the case! In
- libseccomp <2.4.0 this led to some rules having no effect.
- libseccomp 2.4.0 changed how rules are generated, leading to a
- different ordering, which in turn led to a fatal crash during
- startup. Fixes bug 29819; bugfix on 0.2.5.1-alpha. Patch by
- Peter Gerber.
- - Fix crash when reloading logging configuration while the
- experimental sandbox is enabled. Fixes bug 32841; bugfix on
- 0.4.1.7. Patch by Peter Gerber.
- o Minor bugfixes (correctness checks, backport from 0.4.3.1-alpha):
- - Use GCC/Clang's printf-checking feature to make sure that
- tor_assertf() arguments are correctly typed. Fixes bug 32765;
- bugfix on 0.4.1.1-alpha.
- o Minor bugfixes (logging, crash, backport from 0.4.3.1-alpha):
- - Avoid a possible crash when trying to log a (fatal) assertion
- failure about mismatched magic numbers in configuration objects.
- Fixes bug 32771; bugfix on 0.4.2.1-alpha.
- o Minor bugfixes (testing, backport from 0.4.3.1-alpha):
- - When TOR_DISABLE_PRACTRACKER is set, do not apply it to the
- test_practracker.sh script. Doing so caused a test failure. Fixes
- bug 32705; bugfix on 0.4.2.1-alpha.
- - When TOR_DISABLE_PRACTRACKER is set, log a notice to stderr when
- skipping practracker checks. Fixes bug 32705; bugfix
- on 0.4.2.1-alpha.
- o Minor bugfixes (windows service, backport from 0.4.3.1-alpha):
- - Initialize the publish/subscribe system when running as a windows
- service. Fixes bug 32778; bugfix on 0.4.1.1-alpha.
- o Testing (backport from 0.4.3.1-alpha):
- - Turn off Tor's Sandbox in Chutney jobs, and run those jobs on
- Ubuntu Bionic. Turning off the Sandbox is a work-around, until we
- fix the sandbox errors in 32722. Closes ticket 32240.
- - Re-enable the Travis CI macOS Chutney build, but don't let it
- prevent the Travis job from finishing. (The Travis macOS jobs are
- slow, so we don't want to have it delay the whole CI process.)
- Closes ticket 32629.
- o Testing (continuous integration, backport from 0.4.3.1-alpha):
- - Use zstd in our Travis Linux builds. Closes ticket 32242.
- Changes in version 0.4.1.8 - 2020-01-30
- This release backports several bugfixes from later release series,
- including some that had affected the Linux seccomp2 sandbox or Windows
- services. If you're running with one of those configurations, you'll
- probably want to upgrade; otherwise, you should be fine with your
- current version of 0.4.1.x.
- o Major bugfixes (linux seccomp sandbox, backport from 0.4.3.1-alpha):
- - Correct how we use libseccomp. Particularly, stop assuming that
- rules are applied in a particular order or that more rules are
- processed after the first match. Neither is the case! In
- libseccomp <2.4.0 this led to some rules having no effect.
- libseccomp 2.4.0 changed how rules are generated, leading to a
- different ordering, which in turn led to a fatal crash during
- startup. Fixes bug 29819; bugfix on 0.2.5.1-alpha. Patch by
- Peter Gerber.
- - Fix crash when reloading logging configuration while the
- experimental sandbox is enabled. Fixes bug 32841; bugfix on
- 0.4.1.7. Patch by Peter Gerber.
- o Minor bugfixes (crash, backport form 0.4.2.4-rc):
- - When running Tor with an option like --verify-config or
- --dump-config that does not start the event loop, avoid crashing
- if we try to exit early because of an error. Fixes bug 32407;
- bugfix on 0.3.3.1-alpha.
- o Minor bugfixes (windows service, backport from 0.4.3.1-alpha):
- - Initialize the publish/subscribe system when running as a windows
- service. Fixes bug 32778; bugfix on 0.4.1.1-alpha.
- o Testing (backport from 0.4.3.1-alpha):
- - Turn off Tor's Sandbox in Chutney jobs, and run those jobs on
- Ubuntu Bionic. Turning off the Sandbox is a work-around, until we
- fix the sandbox errors in 32722. Closes ticket 32240.
- - Re-enable the Travis CI macOS Chutney build, but don't let it
- prevent the Travis job from finishing. (The Travis macOS jobs are
- slow, so we don't want to have it delay the whole CI process.)
- Closes ticket 32629.
- o Testing (continuous integration, backport from 0.4.3.1-alpha):
- - Use zstd in our Travis Linux builds. Closes ticket 32242.
- Changes in version 0.4.2.5 - 2019-12-09
- This is the first stable release in the 0.4.2.x series. This series
- improves reliability and stability, and includes several stability and
- correctness improvements for onion services. It also fixes many smaller
- bugs present in previous series.
- Per our support policy, we will support the 0.4.2.x series for nine
- months, or until three months after the release of a stable 0.4.3.x:
- whichever is longer. If you need longer-term support, please stick
- with 0.3.5.x, which will we plan to support until Feb 2022.
- Below are the changes since 0.4.1.4-rc. For a complete list of only
- the changes since 0.4.2.4-rc, see the ChangeLog file.
- o Major features (directory authorities):
- - Directory authorities now reject relays running all currently
- deprecated release series. The currently supported release series
- are: 0.2.9, 0.3.5, 0.4.0, 0.4.1, and 0.4.2. Closes ticket 31549.
- o Major features (onion service v3, denial of service):
- - Add onion service introduction denial of service defenses. Intro
- points can now rate-limit client introduction requests, using
- parameters that can be sent by the service within the
- ESTABLISH_INTRO cell. If the cell extension for this is not used,
- the intro point will honor the consensus parameters. Closes
- ticket 30924.
- o Major bugfixes (circuit build, guard):
- - When considering upgrading circuits from "waiting for guard" to
- "open", always ignore circuits that are marked for close.
- Previously we could end up in the situation where a subsystem is
- notified of a circuit opening, but the circuit is still marked for
- close, leading to undesirable behavior. Fixes bug 30871; bugfix
- on 0.3.0.1-alpha.
- o Major bugfixes (crash, Linux, Android):
- - Tolerate systems (including some Android installations) where
- madvise and MADV_DONTDUMP are available at build-time, but not at
- run time. Previously, these systems would notice a failed syscall
- and abort. Fixes bug 31570; bugfix on 0.4.1.1-alpha.
- - Tolerate systems (including some Linux installations) where
- madvise and/or MADV_DONTFORK are available at build-time, but not
- at run time. Previously, these systems would notice a failed
- syscall and abort. Fixes bug 31696; bugfix on 0.4.1.1-alpha.
- o Major bugfixes (embedded Tor):
- - Avoid a possible crash when restarting Tor in embedded mode and
- enabling a different set of publish/subscribe messages. Fixes bug
- 31898; bugfix on 0.4.1.1-alpha.
- o Major bugfixes (relay):
- - Relays now respect their AccountingMax bandwidth again. When
- relays entered "soft" hibernation (which typically starts when
- we've hit 90% of our AccountingMax), we had stopped checking
- whether we should enter hard hibernation. Soft hibernation refuses
- new connections and new circuits, but the existing circuits can
- continue, meaning that relays could have exceeded their configured
- AccountingMax. Fixes bug 32108; bugfix on 0.4.0.1-alpha.
- o Major bugfixes (torrc parsing):
- - Stop ignoring torrc options after an %include directive, when the
- included directory ends with a file that does not contain any
- config options (but does contain comments or whitespace). Fixes
- bug 31408; bugfix on 0.3.1.1-alpha.
- o Major bugfixes (v3 onion services):
- - Onion services now always use the exact number of intro points
- configured with the HiddenServiceNumIntroductionPoints option (or
- fewer if nodes are excluded). Before, a service could sometimes
- pick more intro points than configured. Fixes bug 31548; bugfix
- on 0.3.2.1-alpha.
- o Minor feature (onion services, control port):
- - The ADD_ONION command's keyword "BEST" now defaults to ED25519-V3
- (v3) onion services. Previously it defaulted to RSA1024 (v2).
- Closes ticket 29669.
- o Minor features (auto-formatting scripts):
- - When annotating C macros, never generate a line that our check-
- spaces script would reject. Closes ticket 31759.
- - When annotating C macros, try to remove cases of double-negation.
- Closes ticket 31779.
- o Minor features (best practices tracker):
- - Our best-practices tracker now integrates with our include-checker
- tool to keep track of how many layering violations we have not yet
- fixed. We hope to reduce this number over time to improve Tor's
- modularity. Closes ticket 31176.
- - Add a TOR_PRACTRACKER_OPTIONS variable for passing arguments to
- practracker from the environment. We may want this for continuous
- integration. Closes ticket 31309.
- - Give a warning rather than an error when a practracker exception
- is violated by a small amount, add a --list-overbroad option to
- practracker that lists exceptions that are stricter than they need
- to be, and provide an environment variable for disabling
- practracker. Closes ticket 30752.
- - Our best-practices tracker now looks at headers as well as C
- files. Closes ticket 31175.
- o Minor features (build system):
- - Make pkg-config use --prefix when cross-compiling, if
- PKG_CONFIG_PATH is not set. Closes ticket 32191.
- - Add --disable-manpage and --disable-html-manual options to
- configure script. This will enable shortening build times by not
- building documentation. Resolves issue 19381.
- o Minor features (compilation):
- - Log a more useful error message when we are compiling and one of
- the compile-time hardening options we have selected can be linked
- but not executed. Closes ticket 27530.
- o Minor features (configuration):
- - The configuration code has been extended to allow splitting
- configuration data across multiple objects. Previously, all
- configuration data needed to be kept in a single object, which
- tended to become bloated. Closes ticket 31240.
- o Minor features (continuous integration):
- - When building on Appveyor and Travis, pass the "-k" flag to make,
- so that we are informed of all compilation failures, not just the
- first one or two. Closes ticket 31372.
- - When running CI builds on Travis, put some random data in
- ~/.torrc, to make sure no tests are reading the Tor configuration
- file from its default location. Resolves issue 30102.
- o Minor features (debugging):
- - Log a nonfatal assertion failure if we encounter a configuration
- line whose command is "CLEAR" but which has a nonempty value. This
- should be impossible, according to the rules of our configuration
- line parsing. Closes ticket 31529.
- o Minor features (geoip):
- - Update geoip and geoip6 to the December 3 2019 Maxmind GeoLite2
- Country database. Closes ticket 32685.
- o Minor features (git hooks):
- - Our pre-commit git hook now checks for a special file before
- running practracker, so that practracker only runs on branches
- that are based on master. Since the pre-push hook calls the pre-
- commit hook, practracker will also only run before pushes of
- branches based on master. Closes ticket 30979.
- o Minor features (git scripts):
- - Add a "--" command-line argument, to separate git-push-all.sh
- script arguments from arguments that are passed through to git
- push. Closes ticket 31314.
- - Add a -r <remote-name> argument to git-push-all.sh, so the script
- can push test branches to a personal remote. Closes ticket 31314.
- - Add a -t <test-branch-prefix> argument to git-merge-forward.sh and
- git-push-all.sh, which makes these scripts create, merge forward,
- and push test branches. Closes ticket 31314.
- - Add a -u argument to git-merge-forward.sh, so that the script can
- re-use existing test branches after a merge failure and fix.
- Closes ticket 31314.
- - Add a TOR_GIT_PUSH env var, which sets the default git push
- command and arguments for git-push-all.sh. Closes ticket 31314.
- - Add a TOR_PUSH_DELAY variable to git-push-all.sh, which makes the
- script push master and maint branches with a delay between each
- branch. These delays trigger the CI jobs in a set order, which
- should show the most likely failures first. Also make pushes
- atomic by default, and make the script pass any command-line
- arguments to git push. Closes ticket 29879.
- - Call the shellcheck script from the pre-commit hook. Closes
- ticket 30967.
- - Skip pushing test branches that are the same as a remote
- maint/release/master branch in git-push-all.sh by default. Add a
- -s argument, so git-push-all.sh can push all test branches. Closes
- ticket 31314.
- o Minor features (IPv6, logging):
- - Log IPv6 addresses as well as IPv4 addresses when describing
- routerinfos, routerstatuses, and nodes. Closes ticket 21003.
- o Minor features (maintenance scripts):
- - Add a Coccinelle script to detect bugs caused by incrementing or
- decrementing a variable inside a call to log_debug(). Since
- log_debug() is a macro whose arguments are conditionally
- evaluated, it is usually an error to do this. One such bug was
- 30628, in which SENDME cells were miscounted by a decrement
- operator inside a log_debug() call. Closes ticket 30743.
- o Minor features (onion service v3):
- - Do not allow single hop clients to fetch or post an HS descriptor
- from an HSDir. Closes ticket 24964.
- o Minor features (onion service):
- - Disallow single-hop clients at the introduction point. We've
- removed Tor2web support a while back and single-hop rendezvous
- attempts are blocked at the relays. This change should remove load
- off the network from spammy clients. Close ticket 24963.
- o Minor features (onion services v3):
- - Assist users who try to setup v2 client authorization in v3 onion
- services by pointing them to the right documentation. Closes
- ticket 28966.
- o Minor features (stem tests):
- - Change "make test-stem" so it only runs the stem tests that use
- tor. This change makes test-stem faster and more reliable. Closes
- ticket 31554.
- o Minor features (testing):
- - When running tests that attempt to look up hostnames, replace the
- libc name lookup functions with ones that do not actually touch
- the network. This way, the tests complete more quickly in the
- presence of a slow or missing DNS resolver. Closes ticket 31841.
- - Add a script to invoke "tor --dump-config" and "tor
- --verify-config" with various configuration options, and see
- whether tor's resulting configuration or error messages are what
- we expect. Use it for integration testing of our +Option and
- /Option flags. Closes ticket 31637.
- - Improve test coverage for our existing configuration parsing and
- management API. Closes ticket 30893.
- - Add integration tests to make sure that practracker gives the
- outputs we expect. Closes ticket 31477.
- - The practracker self-tests are now run as part of the Tor test
- suite. Closes ticket 31304.
- o Minor features (testing, continuous integration):
- - Disable all but one Travis CI macOS build, to mitigate slow
- scheduling of Travis macOS jobs. Closes ticket 32177.
- - Run the chutney IPv6 networks as part of Travis CI. Closes
- ticket 30860.
- - Simplify the Travis CI build matrix, and optimise for build time.
- Closes ticket 31859.
- - Use Windows Server 2019 instead of Windows Server 2016 in our
- Appveyor builds. Closes ticket 32086.
- o Minor features (token bucket):
- - Implement a generic token bucket that uses a single counter, for
- use in anti-DoS onion service work. Closes ticket 30687.
- o Minor bugfixes (Appveyor continuous integration):
- - Avoid spurious errors when Appveyor CI fails before the install
- step. Fixes bug 31884; bugfix on 0.3.4.2-alpha.
- o Minor bugfixes (best practices tracker):
- - Fix a few issues in the best-practices script, including tests,
- tab tolerance, error reporting, and directory-exclusion logic.
- Fixes bug 29746; bugfix on 0.4.1.1-alpha.
- - When running check-best-practices, only consider files in the src
- subdirectory. Previously we had recursively considered all
- subdirectories, which made us get confused by the temporary
- directories made by "make distcheck". Fixes bug 31578; bugfix
- on 0.4.1.1-alpha.
- o Minor bugfixes (build system):
- - Interpret "--disable-module-dirauth=no" correctly. Fixes bug
- 32124; bugfix on 0.3.4.1-alpha.
- - Interpret "--with-tcmalloc=no" correctly. Fixes bug 32124; bugfix
- on 0.2.0.20-rc.
- - Stop failing when jemalloc is requested, but tcmalloc is not
- found. Fixes bug 32124; bugfix on 0.3.5.1-alpha.
- - When pkg-config is not installed, or a library that depends on
- pkg-config is not found, tell the user what to do to fix the
- problem. Fixes bug 31922; bugfix on 0.3.1.1-alpha.
- - Do not include the deprecated <sys/sysctl.h> on Linux or Windows
- systems. Fixes bug 31673; bugfix on 0.2.5.4-alpha.
- o Minor bugfixes (chutney, makefiles, documentation):
- - "make test-network-all" now shows the warnings from each test-
- network.sh run on the console, so developers see new warnings
- early. We've also improved the documentation for this feature, and
- renamed a Makefile variable so the code is self-documenting. Fixes
- bug 30455; bugfix on 0.3.0.4-rc.
- o Minor bugfixes (client, onion service v3):
- - Fix a BUG() assertion that occurs within a very small race window
- between when a client intro circuit opens and when its descriptor
- gets cleaned up from the cache. The circuit is now closed early,
- which will trigger a re-fetch of the descriptor and continue the
- connection. Fixes bug 28970; bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (code quality):
- - Fix "make check-includes" so it runs correctly on out-of-tree
- builds. Fixes bug 31335; bugfix on 0.3.5.1-alpha.
- o Minor bugfixes (compilation):
- - Add more stub functions to fix compilation on Android with link-
- time optimization when --disable-module-dirauth is used.
- Previously, these compilation settings would make the compiler
- look for functions that didn't exist. Fixes bug 31552; bugfix
- on 0.4.1.1-alpha.
- - Suppress spurious float-conversion warnings from GCC when calling
- floating-point classifier functions on FreeBSD. Fixes part of bug
- 31687; bugfix on 0.3.1.5-alpha.
- o Minor bugfixes (configuration):
- - Invalid floating-point values in the configuration file are now
- treated as errors in the configuration. Previously, they were
- ignored and treated as zero. Fixes bug 31475; bugfix on 0.0.1.
- o Minor bugfixes (connections):
- - Avoid trying to read data from closed connections, which can cause
- needless loops in Libevent and infinite loops in Shadow. Fixes bug
- 30344; bugfix on 0.1.1.1-alpha.
- o Minor bugfixes (controller protocol):
- - Fix the MAPADDRESS controller command to accept one or more
- arguments. Previously, it required two or more arguments, and
- ignored the first. Fixes bug 31772; bugfix on 0.4.1.1-alpha.
- o Minor bugfixes (coverity):
- - Add an assertion when parsing a BEGIN cell so that coverity can be
- sure that we are not about to dereference a NULL address. Fixes
- bug 31026; bugfix on 0.2.4.7-alpha. This is CID 1447296.
- - In our siphash implementation, when building for coverity, use
- memcpy in place of a switch statement, so that coverity can tell
- we are not accessing out-of-bounds memory. Fixes bug 31025; bugfix
- on 0.2.8.1-alpha. This is tracked as CID 1447293 and 1447295.
- - Fix several coverity warnings from our unit tests. Fixes bug
- 31030; bugfix on 0.2.4.1-alpha, 0.3.2.1-alpha, and 0.4.0.1-alpha.
- o Minor bugfixes (crash):
- - When running Tor with an option like --verify-config or
- --dump-config that does not start the event loop, avoid crashing
- if we try to exit early because of an error. Fixes bug 32407;
- bugfix on 0.3.3.1-alpha.
- o Minor bugfixes (developer tooling):
- - Only log git script changes in the post-merge script when the
- merge was to the master branch. Fixes bug 31040; bugfix
- on 0.4.1.1-alpha.
- o Minor bugfixes (directory authorities):
- - Return a distinct status when formatting annotations fails. Fixes
- bug 30780; bugfix on 0.2.0.8-alpha.
- o Minor bugfixes (error handling):
- - Always lock the backtrace buffer before it is used. Fixes bug
- 31734; bugfix on 0.2.5.3-alpha.
- - On abort, try harder to flush the output buffers of log messages.
- On some platforms (macOS), log messages could be discarded when
- the process terminates. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
- - Report the tor version whenever an assertion fails. Previously, we
- only reported the Tor version on some crashes, and some non-fatal
- assertions. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
- - When tor aborts due to an error, close log file descriptors before
- aborting. Closing the logs makes some OSes flush log file buffers,
- rather than deleting buffered log lines. Fixes bug 31594; bugfix
- on 0.2.5.2-alpha.
- o Minor bugfixes (FreeBSD, PF-based proxy, IPv6):
- - When extracting an IPv6 address from a PF-based proxy, verify that
- we are actually configured to receive an IPv6 address, and log an
- internal error if not. Fixes part of bug 31687; bugfix
- on 0.2.3.4-alpha.
- o Minor bugfixes (git hooks):
- - Remove a duplicate call to practracker from the pre-push hook. The
- pre-push hook already calls the pre-commit hook, which calls
- practracker. Fixes bug 31462; bugfix on 0.4.1.1-alpha.
- o Minor bugfixes (git scripts):
- - Stop hard-coding the bash path in the git scripts. Some OSes don't
- have bash in /usr/bin, others have an ancient bash at this path.
- Fixes bug 30840; bugfix on 0.4.0.1-alpha.
- - Stop hard-coding the tor master branch name and worktree path in
- the git scripts. Fixes bug 30841; bugfix on 0.4.0.1-alpha.
- - Allow git-push-all.sh to be run from any directory. Previously,
- the script only worked if run from an upstream worktree directory.
- Closes ticket 31678.
- o Minor bugfixes (guards):
- - When tor is missing descriptors for some primary entry guards,
- make the log message less alarming. It's normal for descriptors to
- expire, as long as tor fetches new ones soon after. Fixes bug
- 31657; bugfix on 0.3.3.1-alpha.
- o Minor bugfixes (ipv6):
- - Check for private IPv6 addresses alongside their IPv4 equivalents
- when authorities check descriptors. Previously, we only checked
- for private IPv4 addresses. Fixes bug 31088; bugfix on
- 0.2.3.21-rc. Patch by Neel Chauhan.
- - When parsing microdescriptors, we should check the IPv6 exit
- policy alongside IPv4. Previously, we checked both exit policies
- for only router info structures, while microdescriptors were
- IPv4-only. Fixes bug 27284; bugfix on 0.2.3.1-alpha. Patch by
- Neel Chauhan.
- o Minor bugfixes (logging):
- - Add a missing check for HAVE_PTHREAD_H, because the backtrace code
- uses mutexes. Fixes bug 31614; bugfix on 0.2.5.2-alpha.
- - Disable backtrace signal handlers when shutting down tor. Fixes
- bug 31614; bugfix on 0.2.5.2-alpha.
- - Rate-limit the logging message about the obsolete .exit
- notation. Previously, there was no limit on this warning, which
- could potentially be triggered many times by a hostile website.
- Fixes bug 31466; bugfix on 0.2.2.1-alpha.
- - When initialising log domain masks, only set known log domains.
- Fixes bug 31854; bugfix on 0.2.1.1-alpha.
- - Change log level of message "Hash of session info was not as
- expected" to LOG_PROTOCOL_WARN. Fixes bug 12399; bugfix
- on 0.1.1.10-alpha.
- - Fix a code issue that would have broken our parsing of log domains
- as soon as we had 33 of them. Fortunately, we still only have 29.
- Fixes bug 31451; bugfix on 0.4.1.4-rc.
- o Minor bugfixes (logging, protocol violations):
- - Do not log a nonfatal assertion failure when receiving a VERSIONS
- cell on a connection using the obsolete v1 link protocol. Log a
- protocol_warn instead. Fixes bug 31107; bugfix on 0.2.4.4-alpha.
- o Minor bugfixes (mainloop, periodic events, in-process API):
- - Reset the periodic events' "enabled" flag when Tor is shut down
- cleanly. Previously, this flag was left on, which caused periodic
- events not to be re-enabled when Tor was relaunched in-process
- with tor_api.h after a shutdown. Fixes bug 32058; bugfix
- on 0.3.3.1-alpha.
- o Minor bugfixes (memory management):
- - Stop leaking a small amount of memory in nt_service_install(), in
- unreachable code. Fixes bug 30799; bugfix on 0.2.0.7-alpha. Patch
- by Xiaoyin Liu.
- o Minor bugfixes (modules):
- - Explain what the optional Directory Authority module is, and what
- happens when it is disabled. Fixes bug 31825; bugfix
- on 0.3.4.1-alpha.
- o Minor bugfixes (multithreading):
- - Avoid some undefined behaviour when freeing mutexes. Fixes bug
- 31736; bugfix on 0.0.7.
- o Minor bugfixes (networking, IP addresses):
- - When parsing addresses via Tor's internal DNS lookup API, reject
- IPv4 addresses in square brackets, and accept IPv6 addresses in
- square brackets. This change completes the work started in 23082,
- making address parsing consistent between tor's internal DNS
- lookup and address parsing APIs. Fixes bug 30721; bugfix
- on 0.2.1.5-alpha.
- - When parsing addresses via Tor's internal address:port parsing and
- DNS lookup APIs, require IPv6 addresses with ports to have square
- brackets. But allow IPv6 addresses without ports, whether or not
- they have square brackets. Fixes bug 30721; bugfix
- on 0.2.1.5-alpha.
- o Minor bugfixes (onion service v3):
- - When purging the client descriptor cache, close any introduction
- point circuits associated with purged cache entries. This avoids
- picking those circuits later when connecting to the same
- introduction points. Fixes bug 30921; bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (onion services):
- - In the hs_ident_circuit_t data structure, remove the unused field
- circuit_type and the respective argument in hs_ident_circuit_new().
- This field was set by clients (for introduction) and services (for
- introduction and rendezvous) but was never used afterwards. Fixes
- bug 31490; bugfix on 0.3.2.1-alpha. Patch by Neel Chauhan.
- o Minor bugfixes (operator tools):
- - Make tor-print-ed-signing-cert(1) print certificate expiration
- date in RFC 1123 and UNIX timestamp formats, to make output
- machine readable. Fixes bug 31012; bugfix on 0.3.5.1-alpha.
- o Minor bugfixes (process management):
- - Remove overly strict assertions that triggered when a pluggable
- transport failed to launch. Fixes bug 31091; bugfix
- on 0.4.0.1-alpha.
- - Remove an assertion in the Unix process backend. This assertion
- would trigger when we failed to find the executable for a child
- process. Fixes bug 31810; bugfix on 0.4.0.1-alpha.
- o Minor bugfixes (relay):
- - Avoid crashing when starting with a corrupt keys directory where
- the old ntor key and the new ntor key are identical. Fixes bug
- 30916; bugfix on 0.2.4.8-alpha.
- o Minor bugfixes (rust):
- - Correctly exclude a redundant rust build job in Travis. Fixes bug
- 31463; bugfix on 0.3.5.4-alpha.
- - Raise the minimum rustc version to 1.31.0, as checked by configure
- and CI. Fixes bug 31442; bugfix on 0.3.5.4-alpha.
- o Minor bugfixes (sendme, code structure):
- - Rename the trunnel SENDME file definition from sendme.trunnel to
- sendme_cell.trunnel to avoid having twice sendme.{c|h} in the
- repository. Fixes bug 30769; bugfix on 0.4.1.1-alpha.
- o Minor bugfixes (statistics):
- - Stop removing the ed25519 signature if the extra info file is too
- big. If the signature data was removed, but the keyword was kept,
- this could result in an unparseable extra info file. Fixes bug
- 30958; bugfix on 0.2.7.2-alpha.
- o Minor bugfixes (subsystems):
- - Make the subsystem init order match the subsystem module
- dependencies. Call windows process security APIs as early as
- possible. Initialize logging before network and time, so that
- network and time can use logging. Fixes bug 31615; bugfix
- on 0.4.0.1-alpha.
- o Minor bugfixes (testing):
- - Avoid intermittent test failures due to a test that had relied on
- inconsistent timing sources. Fixes bug 31995; bugfix
- on 0.3.1.3-alpha.
- - When testing port rebinding, don't busy-wait for tor to log.
- Instead, actually sleep for a short time before polling again.
- Also improve the formatting of control commands and log messages.
- Fixes bug 31837; bugfix on 0.3.5.1-alpha.
- - Teach the util/socketpair_ersatz test to work correctly when we
- have no network stack configured. Fixes bug 30804; bugfix
- on 0.2.5.1-alpha.
- o Minor bugfixes (tests, SunOS):
- - Avoid a map_anon_nofork test failure due to a signed/unsigned
- integer comparison. Fixes bug 31897; bugfix on 0.4.1.1-alpha.
- o Minor bugfixes (tls, logging):
- - Log bugs about the TLS read buffer's length only once, rather than
- filling the logs with similar warnings. Fixes bug 31939; bugfix
- on 0.3.0.4-rc.
- o Minor bugfixes (v2 single onion services):
- - Always retry v2 single onion service intro and rend circuits with
- a 3-hop path. Previously, v2 single onion services used a 3-hop
- path when rendezvous circuits were retried after a remote or
- delayed failure, but a 1-hop path for immediate retries. Fixes bug
- 23818; bugfix on 0.2.9.3-alpha.
- o Minor bugfixes (v3 onion services):
- - When cleaning up intro circuits for a v3 onion service, don't
- remove circuits that have an established or pending circuit, even
- if they ran out of retries. This way, we don't remove a circuit on
- its last retry. Fixes bug 31652; bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (v3 single onion services):
- - Always retry v3 single onion service intro and rend circuits with
- a 3-hop path. Previously, v3 single onion services used a 3-hop
- path when rend circuits were retried after a remote or delayed
- failure, but a 1-hop path for immediate retries. Fixes bug 23818;
- bugfix on 0.3.2.1-alpha.
- - Make v3 single onion services fall back to a 3-hop intro, when all
- intro points are unreachable via a 1-hop path. Previously, v3
- single onion services failed when all intro nodes were unreachable
- via a 1-hop path. Fixes bug 23507; bugfix on 0.3.2.1-alpha.
- o Code simplification and refactoring:
- - Refactor connection_control_process_inbuf() to reduce the size of
- a practracker exception. Closes ticket 31840.
- - Refactor the microdescs_parse_from_string() function into smaller
- pieces, for better comprehensibility. Closes ticket 31675.
- - Use SEVERITY_MASK_IDX() to find the LOG_* mask indexes in the unit
- tests and fuzzers, rather than using hard-coded values. Closes
- ticket 31334.
- - Interface for function `decrypt_desc_layer` cleaned up. Closes
- ticket 31589.
- o Documentation:
- - Correct the description of "GuardLifetime". Fixes bug 31189;
- bugfix on 0.3.0.1-alpha.
- - Make clear in the man page, in both the bandwidth section and the
- AccountingMax section, that Tor counts in powers of two, not
- powers of ten: 1 GByte is 1024*1024*1024 bytes, not one billion
- bytes. Resolves ticket 32106.
- - Document the signal-safe logging behaviour in the tor man page.
- Also add some comments to the relevant functions. Closes
- ticket 31839.
- - Explain why we can't destroy the backtrace buffer mutex. Explain
- why we don't need to destroy the log mutex. Closes ticket 31736.
- - The Tor source code repository now includes a (somewhat dated)
- description of Tor's modular architecture, in doc/HACKING/design.
- This is based on the old "tor-guts.git" repository, which we are
- adopting and superseding. Closes ticket 31849.
- - Improve documentation in circuit padding subsystem. Patch by
- Tobias Pulls. Closes ticket 31113.
- - Include an example usage for IPv6 ORPort in our sample torrc.
- Closes ticket 31320; patch from Ali Raheem.
- - Use RFC 2397 data URL scheme to embed an image into tor-exit-
- notice.html so that operators no longer have to host it
- themselves. Closes ticket 31089.
- o Removed features:
- - No longer include recommended package digests in votes as detailed
- in proposal 301. The RecommendedPackages torrc option is
- deprecated and will no longer have any effect. "package" lines
- will still be considered when computing consensuses for consensus
- methods that include them. (This change has no effect on the list
- of recommended Tor versions, which is still in use.) Closes
- ticket 29738.
- - Remove torctl.in from contrib/dist directory. Resolves
- ticket 30550.
- o Testing:
- - Require C99 standards-conforming code in Travis CI, but allow GNU
- gcc extensions. Also activates clang's -Wtypedef-redefinition
- warnings. Build some jobs with -std=gnu99, and some jobs without.
- Closes ticket 32500.
- - Run shellcheck for all non-third-party shell scripts that are
- shipped with Tor. Closes ticket 29533.
- - When checking shell scripts, ignore any user-created directories.
- Closes ticket 30967.
- o Code simplification and refactoring (config handling):
- - Extract our variable manipulation code from confparse.c to a new
- lower-level typedvar.h module. Closes ticket 30864.
- - Lower another layer of object management from confparse.c to a
- more general tool. Now typed structure members are accessible via
- an abstract type. Implements ticket 30914.
- - Move our backend logic for working with configuration and state
- files into a lower-level library, since it no longer depends on
- any tor-specific functionality. Closes ticket 31626.
- - Numerous simplifications in configuration-handling logic: remove
- duplicated macro definitions, replace magical names with flags,
- and refactor "TestingTorNetwork" to use the same default-option
- logic as the rest of Tor. Closes ticket 30935.
- - Replace our ad-hoc set of flags for configuration variables and
- configuration variable types with fine-grained orthogonal flags
- corresponding to the actual behavior we want. Closes ticket 31625.
- o Code simplification and refactoring (misc):
- - Eliminate some uses of lower-level control reply abstractions,
- primarily in the onion_helper functions. Closes ticket 30889.
- - Rework bootstrap tracking to use the new publish-subscribe
- subsystem. Closes ticket 29976.
- - Rewrite format_node_description() and router_get_verbose_nickname()
- to use strlcpy() and strlcat(). The previous implementation used
- memcpy() and pointer arithmetic, which was error-prone. Closes
- ticket 31545. This is CID 1452819.
- - Split extrainfo_dump_to_string() into smaller functions. Closes
- ticket 30956.
- - Use the ptrdiff_t type consistently for expressing variable
- offsets and pointer differences. Previously we incorrectly (but
- harmlessly) used int and sometimes off_t for these cases. Closes
- ticket 31532.
- - Use the subsystems mechanism to manage the main event loop code.
- Closes ticket 30806.
- - Various simplifications and minor improvements to the circuit
- padding machines. Patch by Tobias Pulls. Closes tickets 31112
- and 31098.
- o Documentation (hard-coded directories):
- - Improve the documentation for the DirAuthority and FallbackDir
- torrc options. Closes ticket 30955.
- o Documentation (tor.1 man page):
- - Fix typo in tor.1 man page: the option is "--help", not "-help".
- Fixes bug 31008; bugfix on 0.2.2.9-alpha.
- o Testing (continuous integration):
- - Use Ubuntu Bionic images for our Travis CI builds, so we can get a
- recent version of coccinelle. But leave chutney on Ubuntu Trusty,
- until we can fix some Bionic permissions issues (see ticket
- 32240). Related to ticket 31919.
- - Install the mingw OpenSSL package in Appveyor. This makes sure
- that the OpenSSL headers and libraries match in Tor's Appveyor
- builds. (This bug was triggered by an Appveyor image update.)
- Fixes bug 32449; bugfix on 0.3.5.6-rc.
- - In Travis, use Xcode 11.2 on macOS 10.14. Closes ticket 32241.
- Changes in version 0.4.1.7 - 2019-12-09
- This release backports several bugfixes to improve stability and
- correctness. Anyone experiencing build problems or crashes with 0.4.1.6,
- including all relays relying on AccountingMax, should upgrade.
- o Major features (directory authorities, backport from 0.4.2.2-alpha):
- - Directory authorities now reject relays running all currently
- deprecated release series. The currently supported release series
- are: 0.2.9, 0.3.5, 0.4.0, 0.4.1, and 0.4.2. Closes ticket 31549.
- o Major bugfixes (embedded Tor, backport from 0.4.2.2-alpha):
- - Avoid a possible crash when restarting Tor in embedded mode and
- enabling a different set of publish/subscribe messages. Fixes bug
- 31898; bugfix on 0.4.1.1-alpha.
- o Major bugfixes (relay, backport from 0.4.2.3-alpha):
- - Relays now respect their AccountingMax bandwidth again. When
- relays entered "soft" hibernation (which typically starts when
- we've hit 90% of our AccountingMax), we had stopped checking
- whether we should enter hard hibernation. Soft hibernation refuses
- new connections and new circuits, but the existing circuits can
- continue, meaning that relays could have exceeded their configured
- AccountingMax. Fixes bug 32108; bugfix on 0.4.0.1-alpha.
- o Major bugfixes (torrc parsing, backport from 0.4.2.2-alpha):
- - Stop ignoring torrc options after an %include directive, when the
- included directory ends with a file that does not contain any
- config options (but does contain comments or whitespace). Fixes
- bug 31408; bugfix on 0.3.1.1-alpha.
- o Major bugfixes (v3 onion services, backport from 0.4.2.3-alpha):
- - Onion services now always use the exact number of intro points
- configured with the HiddenServiceNumIntroductionPoints option (or
- fewer if nodes are excluded). Before, a service could sometimes
- pick more intro points than configured. Fixes bug 31548; bugfix
- on 0.3.2.1-alpha.
- o Minor features (continuous integration, backport from 0.4.2.2-alpha):
- - When building on Appveyor and Travis, pass the "-k" flag to make,
- so that we are informed of all compilation failures, not just the
- first one or two. Closes ticket 31372.
- o Minor features (geoip, backport from 0.4.2.5):
- - Update geoip and geoip6 to the December 3 2019 Maxmind GeoLite2
- Country database. Closes ticket 32685.
- o Minor bugfixes (Appveyor CI, backport from 0.4.2.2-alpha):
- - Avoid spurious errors when Appveyor CI fails before the install step.
- Fixes bug 31884; bugfix on 0.3.4.2-alpha.
- o Minor bugfixes (client, onion service v3, backport from 0.4.2.4-rc):
- - Fix a BUG() assertion that occurs within a very small race window
- between when a client intro circuit opens and when its descriptor
- gets cleaned up from the cache. The circuit is now closed early,
- which will trigger a re-fetch of the descriptor and continue the
- connection. Fixes bug 28970; bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (connections, backport from 0.4.2.3-rc):
- - Avoid trying to read data from closed connections, which can cause
- needless loops in Libevent and infinite loops in Shadow. Fixes bug
- 30344; bugfix on 0.1.1.1-alpha.
- o Minor bugfixes (error handling, backport from 0.4.2.1-alpha):
- - On abort, try harder to flush the output buffers of log messages.
- On some platforms (macOS), log messages could be discarded when
- the process terminates. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
- - Report the tor version whenever an assertion fails. Previously, we
- only reported the Tor version on some crashes, and some non-fatal
- assertions. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
- - When tor aborts due to an error, close log file descriptors before
- aborting. Closing the logs makes some OSes flush log file buffers,
- rather than deleting buffered log lines. Fixes bug 31594; bugfix
- on 0.2.5.2-alpha.
- o Minor bugfixes (logging, backport from 0.4.2.2-alpha):
- - Add a missing check for HAVE_PTHREAD_H, because the backtrace code
- uses mutexes. Fixes bug 31614; bugfix on 0.2.5.2-alpha.
- - Disable backtrace signal handlers when shutting down tor. Fixes
- bug 31614; bugfix on 0.2.5.2-alpha.
- - Rate-limit the logging message about the obsolete .exit
- notation. Previously, there was no limit on this warning, which
- could potentially be triggered many times by a hostile website.
- Fixes bug 31466; bugfix on 0.2.2.1-alpha.
- o Minor bugfixes (logging, protocol violations, backport from 0.4.2.2-alpha):
- - Do not log a nonfatal assertion failure when receiving a VERSIONS
- cell on a connection using the obsolete v1 link protocol. Log a
- protocol_warn instead. Fixes bug 31107; bugfix on 0.2.4.4-alpha.
- o Minor bugfixes (mainloop, periodic events, in-process API, backport from 0.4.2.3-alpha):
- - Reset the periodic events' "enabled" flag when Tor is shut down
- cleanly. Previously, this flag was left on, which caused periodic
- events not to be re-enabled when Tor was relaunched in-process
- with tor_api.h after a shutdown. Fixes bug 32058; bugfix
- on 0.3.3.1-alpha.
- o Minor bugfixes (multithreading, backport from 0.4.2.2-alpha):
- - Avoid some undefined behaviour when freeing mutexes. Fixes bug
- 31736; bugfix on 0.0.7.
- o Minor bugfixes (process management, backport from 0.4.2.3-alpha):
- - Remove overly strict assertions that triggered when a pluggable
- transport failed to launch. Fixes bug 31091; bugfix
- on 0.4.0.1-alpha.
- - Remove an assertion in the Unix process backend. This assertion
- would trigger when we failed to find the executable for a child
- process. Fixes bug 31810; bugfix on 0.4.0.1-alpha.
- o Minor bugfixes (relay, backport from 0.4.2.2-alpha):
- - Avoid crashing when starting with a corrupt keys directory where
- the old ntor key and the new ntor key are identical. Fixes bug
- 30916; bugfix on 0.2.4.8-alpha.
- o Minor bugfixes (testing, backport from 0.4.2.3-alpha):
- - When testing port rebinding, don't busy-wait for tor to log.
- Instead, actually sleep for a short time before polling again.
- Also improve the formatting of control commands and log messages.
- Fixes bug 31837; bugfix on 0.3.5.1-alpha.
- o Minor bugfixes (tests, SunOS, backport from 0.4.2.2-alpha):
- - Avoid a map_anon_nofork test failure due to a signed/unsigned
- integer comparison. Fixes bug 31897; bugfix on 0.4.1.1-alpha.
- o Minor bugfixes (tls, logging, backport from 0.4.2.3-alpha):
- - Log bugs about the TLS read buffer's length only once, rather than
- filling the logs with similar warnings. Fixes bug 31939; bugfix
- on 0.3.0.4-rc.
- o Documentation (backport from 0.4.2.2-alpha):
- - Explain why we can't destroy the backtrace buffer mutex. Explain
- why we don't need to destroy the log mutex. Closes ticket 31736.
- o Testing (continuous integration, backport from 0.4.2.3-alpha):
- - Disable all but one Travis CI macOS build, to mitigate slow
- scheduling of Travis macOS jobs. Closes ticket 32177.
- - Run the chutney IPv6 networks as part of Travis CI. Closes
- ticket 30860.
- - Simplify the Travis CI build matrix, and optimise for build time.
- Closes ticket 31859.
- - Use Windows Server 2019 instead of Windows Server 2016 in our
- Appveyor builds. Closes ticket 32086.
- o Testing (continuous integration, backport from 0.4.2.4-rc):
- - In Travis, use Xcode 11.2 on macOS 10.14. Closes ticket 32241.
- - Use Ubuntu Bionic images for our Travis CI builds, so we can get a
- recent version of coccinelle. But leave chutney on Ubuntu Trusty,
- until we can fix some Bionic permissions issues (see ticket
- 32240). Related to ticket 31919.
- - Install the mingw OpenSSL package in Appveyor. This makes sure
- that the OpenSSL headers and libraries match in Tor's Appveyor
- builds. (This bug was triggered by an Appveyor image update.)
- Fixes bug 32449; bugfix on 0.3.5.6-rc.
- o Testing (continuous integration, backport from 0.4.2.5):
- - Require C99 standards-conforming code in Travis CI, but allow GNU gcc
- extensions. Also activates clang's -Wtypedef-redefinition warnings.
- Build some jobs with -std=gnu99, and some jobs without.
- Closes ticket 32500.
- Changes in version 0.4.0.6 - 2019-12-09
- This is the second stable release in the 0.4.0.x series. This release
- backports several bugfixes to improve stability and correctness. Anyone
- experiencing build problems or crashes with 0.4.0.5, including all relays
- relying on AccountingMax, should upgrade.
- Note that, per our support policy, support for the 0.4.0.x series will end
- on 2 Feb 2020. Anyone still running 0.4.0.x should plan to upgrade to the
- latest stable release, or downgrade to 0.3.5.x, which will get long-term
- support until 1 Feb 2022.
- o Directory authority changes (backport from 0.4.1.5):
- - The directory authority "dizum" has a new IP address. Closes
- ticket 31406.
- o Major bugfixes (bridges, backport from 0.4.1.2-alpha):
- - Consider our directory information to have changed when our list
- of bridges changes. Previously, Tor would not re-compute the
- status of its directory information when bridges changed, and
- therefore would not realize that it was no longer able to build
- circuits. Fixes part of bug 29875.
- - Do not count previously configured working bridges towards our
- total of working bridges. Previously, when Tor's list of bridges
- changed, it would think that the old bridges were still usable,
- and delay fetching router descriptors for the new ones. Fixes part
- of bug 29875; bugfix on 0.3.0.1-alpha.
- o Major bugfixes (circuit build, guard, backport from 0.4.1.4-rc):
- - When considering upgrading circuits from "waiting for guard" to
- "open", always ignore circuits that are marked for close. Otherwise,
- we can end up in the situation where a subsystem is notified that
- a closing circuit has just opened, leading to undesirable
- behavior. Fixes bug 30871; bugfix on 0.3.0.1-alpha.
- o Major bugfixes (Onion service reachability, backport from 0.4.1.3-alpha):
- - Properly clean up the introduction point map when circuits change
- purpose from onion service circuits to pathbias, measurement, or
- other circuit types. This should fix some service-side instances
- of introduction point failure. Fixes bug 29034; bugfix
- on 0.3.2.1-alpha.
- o Major bugfixes (onion service v3, backport from 0.4.1.1-alpha):
- - Fix an unreachable bug in which an introduction point could try to
- send an INTRODUCE_ACK with a status code that Trunnel would refuse
- to encode, leading the relay to assert(). We've consolidated the
- ABI values into Trunnel now. Fixes bug 30454; bugfix
- on 0.3.0.1-alpha.
- - Clients can now handle unknown status codes from INTRODUCE_ACK
- cells. (The NACK behavior will stay the same.) This will allow us
- to extend status codes in the future without breaking the normal
- client behavior. Fixes another part of bug 30454; bugfix
- on 0.3.0.1-alpha.
- o Major bugfixes (relay, backport from 0.4.2.3-alpha):
- - Relays now respect their AccountingMax bandwidth again. When
- relays entered "soft" hibernation (which typically starts when
- we've hit 90% of our AccountingMax), we had stopped checking
- whether we should enter hard hibernation. Soft hibernation refuses
- new connections and new circuits, but the existing circuits can
- continue, meaning that relays could have exceeded their configured
- AccountingMax. Fixes bug 32108; bugfix on 0.4.0.1-alpha.
- o Major bugfixes (torrc parsing, backport from 0.4.2.2-alpha):
- - Stop ignoring torrc options after an %include directive, when the
- included directory ends with a file that does not contain any
- config options (but does contain comments or whitespace). Fixes
- bug 31408; bugfix on 0.3.1.1-alpha.
- o Major bugfixes (v3 onion services, backport from 0.4.2.3-alpha):
- - Onion services now always use the exact number of intro points
- configured with the HiddenServiceNumIntroductionPoints option (or
- fewer if nodes are excluded). Before, a service could sometimes
- pick more intro points than configured. Fixes bug 31548; bugfix
- on 0.3.2.1-alpha.
- o Minor features (compile-time modules, backport from version 0.4.1.1-alpha):
- - Add a "--list-modules" command to print a list of which compile-
- time modules are enabled. Closes ticket 30452.
- o Minor features (continuous integration, backport from 0.4.1.1-alpha):
- - Remove sudo configuration lines from .travis.yml as they are no
- longer needed with current Travis build environment. Resolves
- issue 30213.
- o Minor features (continuous integration, backport from 0.4.1.4-rc):
- - Our Travis configuration now uses Chutney to run some network
- integration tests automatically. Closes ticket 29280.
- o Minor features (continuous integration, backport from 0.4.2.2-alpha):
- - When building on Appveyor and Travis, pass the "-k" flag to make,
- so that we are informed of all compilation failures, not just the
- first one or two. Closes ticket 31372.
- o Minor features (fallback directory list, backport from 0.4.1.4-rc):
- - Replace the 157 fallbacks originally introduced in Tor 0.3.5.6-rc
- in December 2018 (of which ~122 were still functional), with a
- list of 148 fallbacks (70 new, 78 existing, 79 removed) generated
- in June 2019. Closes ticket 28795.
- o Minor features (geoip, backport from 0.4.2.5):
- - Update geoip and geoip6 to the December 3 2019 Maxmind GeoLite2
- Country database. Closes ticket 32685.
- o Minor features (stem tests, backport from 0.4.2.1-alpha):
- - Change "make test-stem" so it only runs the stem tests that use
- tor. This change makes test-stem faster and more reliable. Closes
- ticket 31554.
- o Minor bugfixes (Appveyor CI, backport from 0.4.2.2-alpha):
- - Avoid spurious errors when Appveyor CI fails before the install step.
- Fixes bug 31884; bugfix on 0.3.4.2-alpha.
- o Minor bugfixes (build system, backport form 0.4.2.1-alpha):
- - Do not include the deprecated <sys/sysctl.h> on Linux or Windows
- systems. Fixes bug 31673; bugfix on 0.2.5.4-alpha.
- o Minor bugfixes (circuit isolation, backport from 0.4.1.3-alpha):
- - Fix a logic error that prevented the SessionGroup sub-option from
- being accepted. Fixes bug 22619; bugfix on 0.2.7.2-alpha.
- o Minor bugfixes (circuit padding, backport from 0.4.1.4-rc):
- - On relays, properly check that a padding machine is absent before
- logging a warning about it being absent. Fixes bug 30649; bugfix
- on 0.4.0.1-alpha.
- o Minor bugfixes (client, onion service v3, backport from 0.4.2.4-rc):
- - Fix a BUG() assertion that occurs within a very small race window
- between when a client intro circuit opens and when its descriptor
- gets cleaned up from the cache. The circuit is now closed early,
- which will trigger a re-fetch of the descriptor and continue the
- connection. Fixes bug 28970; bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (clock skew detection, backport from 0.4.1.5):
- - Don't believe clock skew results from NETINFO cells that appear to
- arrive before we sent the VERSIONS cells they are responding to.
- Previously, we would accept them up to 3 minutes "in the past".
- Fixes bug 31343; bugfix on 0.2.4.4-alpha.
- o Minor bugfixes (compilation warning, backport from 0.4.1.5):
- - Fix a compilation warning on Windows about casting a function
- pointer for GetTickCount64(). Fixes bug 31374; bugfix
- on 0.2.9.1-alpha.
- o Minor bugfixes (compilation, backport from 0.4.1.5):
- - Avoid using labs() on time_t, which can cause compilation warnings
- on 64-bit Windows builds. Fixes bug 31343; bugfix on 0.2.4.4-alpha.
- o Minor bugfixes (compilation, backport from 0.4.2.1-alpha):
- - Suppress spurious float-conversion warnings from GCC when calling
- floating-point classifier functions on FreeBSD. Fixes part of bug
- 31687; bugfix on 0.3.1.5-alpha.
- o Minor bugfixes (compilation, unusual configurations, backport from 0.4.1.1-alpha):
- - Avoid failures when building with the ALL_BUGS_ARE_FATAL option
- due to missing declarations of abort(), and prevent other such
- failures in the future. Fixes bug 30189; bugfix on 0.3.4.1-alpha.
- o Minor bugfixes (configuration, proxies, backport from 0.4.1.2-alpha):
- - Fix a bug that prevented us from supporting SOCKS5 proxies that
- want authentication along with configured (but unused!)
- ClientTransportPlugins. Fixes bug 29670; bugfix on 0.2.6.1-alpha.
- o Minor bugfixes (connections, backport from 0.4.2.3-rc):
- - Avoid trying to read data from closed connections, which can cause
- needless loops in Libevent and infinite loops in Shadow. Fixes bug
- 30344; bugfix on 0.1.1.1-alpha.
- o Minor bugfixes (continuous integration, backport from 0.4.1.3-alpha):
- - Allow the test-stem job to fail in Travis, because it sometimes
- hangs. Fixes bug 30744; bugfix on 0.3.5.4-alpha.
- - Skip test_rebind on macOS in Travis, because it is unreliable on
- macOS on Travis. Fixes bug 30713; bugfix on 0.3.5.1-alpha.
- - Skip test_rebind when the TOR_SKIP_TEST_REBIND environment
- variable is set. Fixes bug 30713; bugfix on 0.3.5.1-alpha.
- o Minor bugfixes (crash on exit, backport from 0.4.1.4-rc):
- - Avoid a set of possible code paths that could try to use freed
- memory in routerlist_free() while Tor was exiting. Fixes bug
- 31003; bugfix on 0.1.2.2-alpha.
- o Minor bugfixes (directory authorities, backport from 0.4.1.3-alpha):
- - Stop crashing after parsing an unknown descriptor purpose
- annotation. We think this bug can only be triggered by modifying a
- local file. Fixes bug 30781; bugfix on 0.2.0.8-alpha.
- o Minor bugfixes (directory authority, backport from 0.4.1.2-alpha):
- - Move the "bandwidth-file-headers" line in directory authority
- votes so that it conforms to dir-spec.txt. Fixes bug 30316; bugfix
- on 0.3.5.1-alpha.
- o Minor bugfixes (error handling, backport from 0.4.2.1-alpha):
- - On abort, try harder to flush the output buffers of log messages.
- On some platforms (macOS), log messages could be discarded when
- the process terminates. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
- - Report the tor version whenever an assertion fails. Previously, we
- only reported the Tor version on some crashes, and some non-fatal
- assertions. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
- o Minor bugfixes (FreeBSD, PF-based proxy, IPv6, backport from 0.4.2.1-alpha):
- - When extracting an IPv6 address from a PF-based proxy, verify that
- we are actually configured to receive an IPv6 address, and log an
- internal error if not. Fixes part of bug 31687; bugfix
- on 0.2.3.4-alpha.
- o Minor bugfixes (guards, backport from 0.4.2.1-alpha):
- - When tor is missing descriptors for some primary entry guards,
- make the log message less alarming. It's normal for descriptors to
- expire, as long as tor fetches new ones soon after. Fixes bug
- 31657; bugfix on 0.3.3.1-alpha.
- o Minor bugfixes (logging, backport from 0.4.1.1-alpha):
- - Do not log a warning when running with an OpenSSL version other
- than the one Tor was compiled with, if the two versions should be
- compatible. Previously, we would warn whenever the version was
- different. Fixes bug 30190; bugfix on 0.2.4.2-alpha.
- o Minor bugfixes (logging, backport from 0.4.2.1-alpha):
- - Change log level of message "Hash of session info was not as
- expected" to LOG_PROTOCOL_WARN. Fixes bug 12399; bugfix
- on 0.1.1.10-alpha.
- o Minor bugfixes (logging, backport from 0.4.2.2-alpha):
- - Rate-limit the logging message about the obsolete .exit
- notation. Previously, there was no limit on this warning, which
- could potentially be triggered many times by a hostile website.
- Fixes bug 31466; bugfix on 0.2.2.1-alpha.
- o Minor bugfixes (logging, protocol violations, backport from 0.4.2.2-alpha):
- - Do not log a nonfatal assertion failure when receiving a VERSIONS
- cell on a connection using the obsolete v1 link protocol. Log a
- protocol_warn instead. Fixes bug 31107; bugfix on 0.2.4.4-alpha.
- o Minor bugfixes (mainloop, periodic events, in-process API, backport from 0.4.2.3-alpha):
- - Reset the periodic events' "enabled" flag when Tor is shut down
- cleanly. Previously, this flag was left on, which caused periodic
- events not to be re-enabled when Tor was relaunched in-process
- with tor_api.h after a shutdown. Fixes bug 32058; bugfix
- on 0.3.3.1-alpha.
- o Minor bugfixes (memory leak, backport from 0.4.1.1-alpha):
- - Avoid a minor memory leak that could occur on relays when failing
- to create a "keys" directory. Fixes bug 30148; bugfix
- on 0.3.3.1-alpha.
- o Minor bugfixes (memory leak, backport from 0.4.1.4-rc):
- - Fix a trivial memory leak when parsing an invalid value
- from a download schedule in the configuration. Fixes bug
- 30894; bugfix on 0.3.4.1-alpha.
- o Minor bugfixes (NetBSD, backport from 0.4.1.2-alpha):
- - Fix usage of minherit() on NetBSD and other platforms that define
- MAP_INHERIT_{ZERO,NONE} instead of INHERIT_{ZERO,NONE}. Fixes bug
- 30614; bugfix on 0.4.0.2-alpha. Patch from Taylor Campbell.
- o Minor bugfixes (onion services, backport from 0.4.1.1-alpha):
- - Avoid a GCC 9.1.1 warning (and possible crash depending on libc
- implementation) when failing to load an onion service client
- authorization file. Fixes bug 30475; bugfix on 0.3.5.1-alpha.
- o Minor bugfixes (out-of-memory handler, backport from 0.4.1.2-alpha):
- - When purging the DNS cache because of an out-of-memory condition,
- try purging just the older entries at first. Previously, we would
- always purge the whole thing. Fixes bug 29617; bugfix
- on 0.3.5.1-alpha.
- o Minor bugfixes (portability, backport from 0.4.1.2-alpha):
- - Avoid crashing in our tor_vasprintf() implementation on systems
- that define neither vasprintf() nor _vscprintf(). (This bug has
- been here long enough that we question whether people are running
- Tor on such systems, but we're applying the fix out of caution.)
- Fixes bug 30561; bugfix on 0.2.8.2-alpha. Found and fixed by
- Tobias Stoeckmann.
- o Minor bugfixes (process management, backport from 0.4.2.3-alpha):
- - Remove overly strict assertions that triggered when a pluggable
- transport failed to launch. Fixes bug 31091; bugfix
- on 0.4.0.1-alpha.
- - Remove an assertion in the Unix process backend. This assertion
- would trigger when we failed to find the executable for a child
- process. Fixes bug 31810; bugfix on 0.4.0.1-alpha.
- o Minor bugfixes (relay, backport from 0.4.2.2-alpha):
- - Avoid crashing when starting with a corrupt keys directory where
- the old ntor key and the new ntor key are identical. Fixes bug
- 30916; bugfix on 0.2.4.8-alpha.
- o Minor bugfixes (rust, backport from 0.4.2.1-alpha):
- - Correctly exclude a redundant rust build job in Travis. Fixes bug
- 31463; bugfix on 0.3.5.4-alpha.
- o Minor bugfixes (testing, backport from 0.4.2.3-alpha):
- - When testing port rebinding, don't busy-wait for tor to log.
- Instead, actually sleep for a short time before polling again.
- Also improve the formatting of control commands and log messages.
- Fixes bug 31837; bugfix on 0.3.5.1-alpha.
- o Minor bugfixes (tls, logging, backport from 0.4.2.3-alpha):
- - Log bugs about the TLS read buffer's length only once, rather than
- filling the logs with similar warnings. Fixes bug 31939; bugfix
- on 0.3.0.4-rc.
- o Minor bugfixes (v2 single onion services, backport from 0.4.2.1-alpha):
- - Always retry v2 single onion service intro and rend circuits with
- a 3-hop path. Previously, v2 single onion services used a 3-hop
- path when rendezvous circuits were retried after a remote or
- delayed failure, but a 1-hop path for immediate retries. Fixes bug
- 23818; bugfix on 0.2.9.3-alpha.
- - Make v3 single onion services fall back to a 3-hop intro, when all
- intro points are unreachable via a 1-hop path. Previously, v3
- single onion services failed when all intro nodes were unreachable
- via a 1-hop path. Fixes bug 23507; bugfix on 0.3.2.1-alpha.
- o Documentation (backport from 0.4.2.1-alpha):
- - Use RFC 2397 data URL scheme to embed an image into tor-exit-
- notice.html so that operators no longer have to host it
- themselves. Closes ticket 31089.
- o Testing (backport from 0.4.1.2-alpha):
- - Specify torrc paths (with empty files) when launching tor in
- integration tests; refrain from reading user and system torrcs.
- Resolves issue 29702.
- o Testing (continuous integration, backport from 0.4.1.1-alpha):
- - In Travis, show stem's tor log after failure. Closes ticket 30234.
- o Testing (continuous integration, backport from 0.4.1.5):
- - In Travis, make stem log a controller trace to the console, and
- tail stem's tor log after failure. Closes ticket 30591.
- - In Travis, only run the stem tests that use a tor binary. Closes
- ticket 30694.
- o Testing (continuous integration, backport from 0.4.2.3-alpha):
- - Disable all but one Travis CI macOS build, to mitigate slow
- scheduling of Travis macOS jobs. Closes ticket 32177.
- - Run the chutney IPv6 networks as part of Travis CI. Closes
- ticket 30860.
- - Simplify the Travis CI build matrix, and optimise for build time.
- Closes ticket 31859.
- - Use Windows Server 2019 instead of Windows Server 2016 in our
- Appveyor builds. Closes ticket 32086.
- o Testing (continuous integration, backport from 0.4.2.4-rc):
- - Use Ubuntu Bionic images for our Travis CI builds, so we can get a
- recent version of coccinelle. But leave chutney on Ubuntu Trusty,
- until we can fix some Bionic permissions issues (see ticket
- 32240). Related to ticket 31919.
- - Install the mingw OpenSSL package in Appveyor. This makes sure
- that the OpenSSL headers and libraries match in Tor's Appveyor
- builds. (This bug was triggered by an Appveyor image update.)
- Fixes bug 32449; bugfix on 0.3.5.6-rc.
- - In Travis, use Xcode 11.2 on macOS 10.14. Closes ticket 32241.
- o Testing (continuous integration, backport from 0.4.2.5):
- - Require C99 standards-conforming code in Travis CI, but allow GNU gcc
- extensions. Also activates clang's -Wtypedef-redefinition warnings.
- Build some jobs with -std=gnu99, and some jobs without.
- Closes ticket 32500.
- Changes in version 0.3.5.9 - 2019-12-09
- Tor 0.3.5.9 backports serveral fixes from later releases, including
- several that affect bridge users, relay stability, onion services,
- and much more.
- o Directory authority changes (backport from 0.4.1.5):
- - The directory authority "dizum" has a new IP address. Closes
- ticket 31406.
- o Major bugfixes (bridges, backport from 0.4.1.2-alpha):
- - Consider our directory information to have changed when our list
- of bridges changes. Previously, Tor would not re-compute the
- status of its directory information when bridges changed, and
- therefore would not realize that it was no longer able to build
- circuits. Fixes part of bug 29875.
- - Do not count previously configured working bridges towards our
- total of working bridges. Previously, when Tor's list of bridges
- changed, it would think that the old bridges were still usable,
- and delay fetching router descriptors for the new ones. Fixes part
- of bug 29875; bugfix on 0.3.0.1-alpha.
- o Major bugfixes (circuit build, guard, backport from 0.4.1.4-rc):
- - When considering upgrading circuits from "waiting for guard" to
- "open", always ignore circuits that are marked for close. Otherwise,
- we can end up in the situation where a subsystem is notified that
- a closing circuit has just opened, leading to undesirable
- behavior. Fixes bug 30871; bugfix on 0.3.0.1-alpha.
- o Major bugfixes (NSS, relay, backport from 0.4.0.4-rc):
- - When running with NSS, disable TLS 1.2 ciphersuites that use
- SHA384 for their PRF. Due to an NSS bug, the TLS key exporters for
- these ciphersuites don't work -- which caused relays to fail to
- handshake with one another when these ciphersuites were enabled.
- Fixes bug 29241; bugfix on 0.3.5.1-alpha.
- o Major bugfixes (Onion service reachability, backport from 0.4.1.3-alpha):
- - Properly clean up the introduction point map when circuits change
- purpose from onion service circuits to pathbias, measurement, or
- other circuit types. This should fix some service-side instances
- of introduction point failure. Fixes bug 29034; bugfix
- on 0.3.2.1-alpha.
- o Major bugfixes (onion service v3, backport from 0.4.1.1-alpha):
- - Fix an unreachable bug in which an introduction point could try to
- send an INTRODUCE_ACK with a status code that Trunnel would refuse
- to encode, leading the relay to assert(). We've consolidated the
- ABI values into Trunnel now. Fixes bug 30454; bugfix
- on 0.3.0.1-alpha.
- - Clients can now handle unknown status codes from INTRODUCE_ACK
- cells. (The NACK behavior will stay the same.) This will allow us
- to extend status codes in the future without breaking the normal
- client behavior. Fixes another part of bug 30454; bugfix
- on 0.3.0.1-alpha.
- o Major bugfixes (torrc parsing, backport from 0.4.2.2-alpha):
- - Stop ignoring torrc options after an %include directive, when the
- included directory ends with a file that does not contain any
- config options (but does contain comments or whitespace). Fixes
- bug 31408; bugfix on 0.3.1.1-alpha.
- o Major bugfixes (v3 onion services, backport from 0.4.2.3-alpha):
- - Onion services now always use the exact number of intro points
- configured with the HiddenServiceNumIntroductionPoints option (or
- fewer if nodes are excluded). Before, a service could sometimes
- pick more intro points than configured. Fixes bug 31548; bugfix
- on 0.3.2.1-alpha.
- o Minor features (address selection, backport from 0.4.0.3-alpha):
- - Treat the subnet 100.64.0.0/10 as public for some purposes;
- private for others. This subnet is the RFC 6598 (Carrier Grade
- NAT) IP range, and is deployed by many ISPs as an alternative to
- RFC 1918 that does not break existing internal networks. Tor now
- blocks SOCKS and control ports on these addresses and warns users
- if client ports or ExtORPorts are listening on a RFC 6598 address.
- Closes ticket 28525. Patch by Neel Chauhan.
- o Minor features (bandwidth authority, backport from 0.4.0.4-rc):
- - Make bandwidth authorities ignore relays that are reported in the
- bandwidth file with the flag "vote=0". This change allows us to
- report unmeasured relays for diagnostic reasons without including
- their bandwidth in the bandwidth authorities' vote. Closes
- ticket 29806.
- o Minor features (compile-time modules, backport from version 0.4.1.1-alpha):
- - Add a "--list-modules" command to print a list of which compile-
- time modules are enabled. Closes ticket 30452.
- o Minor features (continuous integration, backport from 0.4.0.4-rc):
- - On Travis Rust builds, cleanup Rust registry and refrain from
- caching the "target/" directory to speed up builds. Resolves
- issue 29962.
- o Minor features (continuous integration, backport from 0.4.0.5):
- - In Travis, tell timelimit to use stem's backtrace signals, and
- launch python directly from timelimit, so python receives the
- signals from timelimit, rather than make. Closes ticket 30117.
- o Minor features (continuous integration, backport from 0.4.1.1-alpha):
- - Remove sudo configuration lines from .travis.yml as they are no
- longer needed with current Travis build environment. Resolves
- issue 30213.
- o Minor features (continuous integration, backport from 0.4.1.4-rc):
- - Our Travis configuration now uses Chutney to run some network
- integration tests automatically. Closes ticket 29280.
- o Minor features (continuous integration, backport from 0.4.2.2-alpha):
- - When building on Appveyor and Travis, pass the "-k" flag to make,
- so that we are informed of all compilation failures, not just the
- first one or two. Closes ticket 31372.
- o Minor features (fallback directory list, backport from 0.4.1.4-rc):
- - Replace the 157 fallbacks originally introduced in Tor 0.3.5.6-rc
- in December 2018 (of which ~122 were still functional), with a
- list of 148 fallbacks (70 new, 78 existing, 79 removed) generated
- in June 2019. Closes ticket 28795.
- o Minor features (geoip, backport from 0.4.2.5):
- - Update geoip and geoip6 to the December 3 2019 Maxmind GeoLite2
- Country database. Closes ticket 32685.
- o Minor features (NSS, diagnostic, backport from 0.4.0.4-rc):
- - Try to log an error from NSS (if there is any) and a more useful
- description of our situation if we are using NSS and a call to
- SSL_ExportKeyingMaterial() fails. Diagnostic for ticket 29241.
- o Minor features (stem tests, backport from 0.4.2.1-alpha):
- - Change "make test-stem" so it only runs the stem tests that use
- tor. This change makes test-stem faster and more reliable. Closes
- ticket 31554.
- o Minor bugfixes (security, backport from 0.4.0.4-rc):
- - Verify in more places that we are not about to create a buffer
- with more than INT_MAX bytes, to avoid possible OOB access in the
- event of bugs. Fixes bug 30041; bugfix on 0.2.0.16. Found and
- fixed by Tobias Stoeckmann.
- - Fix a potential double free bug when reading huge bandwidth files.
- The issue is not exploitable in the current Tor network because
- the vulnerable code is only reached when directory authorities
- read bandwidth files, but bandwidth files come from a trusted
- source (usually the authorities themselves). Furthermore, the
- issue is only exploitable in rare (non-POSIX) 32-bit architectures,
- which are not used by any of the current authorities. Fixes bug
- 30040; bugfix on 0.3.5.1-alpha. Bug found and fixed by
- Tobias Stoeckmann.
- o Minor bugfix (continuous integration, backport from 0.4.0.4-rc):
- - Reset coverage state on disk after Travis CI has finished. This
- should prevent future coverage merge errors from causing the test
- suite for the "process" subsystem to fail. The process subsystem
- was introduced in 0.4.0.1-alpha. Fixes bug 29036; bugfix
- on 0.2.9.15.
- - Terminate test-stem if it takes more than 9.5 minutes to run.
- (Travis terminates the job after 10 minutes of no output.)
- Diagnostic for 29437. Fixes bug 30011; bugfix on 0.3.5.4-alpha.
- o Minor bugfixes (Appveyor CI, backport from 0.4.2.2-alpha):
- - Avoid spurious errors when Appveyor CI fails before the install step.
- Fixes bug 31884; bugfix on 0.3.4.2-alpha.
- o Minor bugfixes (build system, backport form 0.4.2.1-alpha):
- - Do not include the deprecated <sys/sysctl.h> on Linux or Windows
- systems. Fixes bug 31673; bugfix on 0.2.5.4-alpha.
- o Minor bugfixes (C correctness, backport from 0.4.0.4-rc):
- - Fix an unlikely memory leak in consensus_diff_apply(). Fixes bug
- 29824; bugfix on 0.3.1.1-alpha. This is Coverity warning
- CID 1444119.
- o Minor bugfixes (circuit isolation, backport from 0.4.1.3-alpha):
- - Fix a logic error that prevented the SessionGroup sub-option from
- being accepted. Fixes bug 22619; bugfix on 0.2.7.2-alpha.
- o Minor bugfixes (client, onion service v3, backport from 0.4.2.4-rc):
- - Fix a BUG() assertion that occurs within a very small race window
- between when a client intro circuit opens and when its descriptor
- gets cleaned up from the cache. The circuit is now closed early,
- which will trigger a re-fetch of the descriptor and continue the
- connection. Fixes bug 28970; bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (clock skew detection, backport from 0.4.1.5):
- - Don't believe clock skew results from NETINFO cells that appear to
- arrive before we sent the VERSIONS cells they are responding to.
- Previously, we would accept them up to 3 minutes "in the past".
- Fixes bug 31343; bugfix on 0.2.4.4-alpha.
- o Minor bugfixes (compilation warning, backport from 0.4.1.5):
- - Fix a compilation warning on Windows about casting a function
- pointer for GetTickCount64(). Fixes bug 31374; bugfix
- on 0.2.9.1-alpha.
- o Minor bugfixes (compilation, backport from 0.4.0.2-alpha):
- - Silence a compiler warning in test-memwipe.c on OpenBSD. Fixes bug
- 29145; bugfix on 0.2.9.3-alpha. Patch from Kris Katterjohn.
- o Minor bugfixes (compilation, backport from 0.4.1.5):
- - Avoid using labs() on time_t, which can cause compilation warnings
- on 64-bit Windows builds. Fixes bug 31343; bugfix on 0.2.4.4-alpha.
- o Minor bugfixes (compilation, backport from 0.4.2.1-alpha):
- - Suppress spurious float-conversion warnings from GCC when calling
- floating-point classifier functions on FreeBSD. Fixes part of bug
- 31687; bugfix on 0.3.1.5-alpha.
- o Minor bugfixes (compilation, unusual configurations, backport from 0.4.1.1-alpha):
- - Avoid failures when building with the ALL_BUGS_ARE_FATAL option
- due to missing declarations of abort(), and prevent other such
- failures in the future. Fixes bug 30189; bugfix on 0.3.4.1-alpha.
- o Minor bugfixes (configuration, proxies, backport from 0.4.1.2-alpha):
- - Fix a bug that prevented us from supporting SOCKS5 proxies that
- want authentication along with configured (but unused!)
- ClientTransportPlugins. Fixes bug 29670; bugfix on 0.2.6.1-alpha.
- o Minor bugfixes (connections, backport from 0.4.2.3-rc):
- - Avoid trying to read data from closed connections, which can cause
- needless loops in Libevent and infinite loops in Shadow. Fixes bug
- 30344; bugfix on 0.1.1.1-alpha.
- o Minor bugfixes (continuous integration, backport from 0.4.1.3-alpha):
- - Allow the test-stem job to fail in Travis, because it sometimes
- hangs. Fixes bug 30744; bugfix on 0.3.5.4-alpha.
- - Skip test_rebind on macOS in Travis, because it is unreliable on
- macOS on Travis. Fixes bug 30713; bugfix on 0.3.5.1-alpha.
- - Skip test_rebind when the TOR_SKIP_TEST_REBIND environment
- variable is set. Fixes bug 30713; bugfix on 0.3.5.1-alpha.
- o Minor bugfixes (crash on exit, backport from 0.4.1.4-rc):
- - Avoid a set of possible code paths that could try to use freed
- memory in routerlist_free() while Tor was exiting. Fixes bug
- 31003; bugfix on 0.1.2.2-alpha.
- o Minor bugfixes (directory authorities, backport from 0.4.1.3-alpha):
- - Stop crashing after parsing an unknown descriptor purpose
- annotation. We think this bug can only be triggered by modifying a
- local file. Fixes bug 30781; bugfix on 0.2.0.8-alpha.
- o Minor bugfixes (directory authority, backport from 0.4.1.2-alpha):
- - Move the "bandwidth-file-headers" line in directory authority
- votes so that it conforms to dir-spec.txt. Fixes bug 30316; bugfix
- on 0.3.5.1-alpha.
- o Minor bugfixes (error handling, backport from 0.4.2.1-alpha):
- - On abort, try harder to flush the output buffers of log messages.
- On some platforms (macOS), log messages could be discarded when
- the process terminates. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
- - Report the tor version whenever an assertion fails. Previously, we
- only reported the Tor version on some crashes, and some non-fatal
- assertions. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
- o Minor bugfixes (FreeBSD, PF-based proxy, IPv6, backport from 0.4.2.1-alpha):
- - When extracting an IPv6 address from a PF-based proxy, verify that
- we are actually configured to receive an IPv6 address, and log an
- internal error if not. Fixes part of bug 31687; bugfix
- on 0.2.3.4-alpha.
- o Minor bugfixes (guards, backport from 0.4.2.1-alpha):
- - When tor is missing descriptors for some primary entry guards,
- make the log message less alarming. It's normal for descriptors to
- expire, as long as tor fetches new ones soon after. Fixes bug
- 31657; bugfix on 0.3.3.1-alpha.
- o Minor bugfixes (logging, backport from 0.4.0.2-alpha):
- - Avoid logging that we are relaxing a circuit timeout when that
- timeout is fixed. Fixes bug 28698; bugfix on 0.2.4.7-alpha.
- o Minor bugfixes (logging, backport from 0.4.0.3-alpha):
- - Correct a misleading error message when IPv4Only or IPv6Only is
- used but the resolved address can not be interpreted as an address
- of the specified IP version. Fixes bug 13221; bugfix on
- 0.2.3.9-alpha. Patch from Kris Katterjohn.
- - Log the correct port number for listening sockets when "auto" is
- used to let Tor pick the port number. Previously, port 0 was
- logged instead of the actual port number. Fixes bug 29144; bugfix
- on 0.3.5.1-alpha. Patch from Kris Katterjohn.
- - Stop logging a BUG() warning when Tor is waiting for exit
- descriptors. Fixes bug 28656; bugfix on 0.3.5.1-alpha.
- o Minor bugfixes (logging, backport from 0.4.1.1-alpha):
- - Do not log a warning when running with an OpenSSL version other
- than the one Tor was compiled with, if the two versions should be
- compatible. Previously, we would warn whenever the version was
- different. Fixes bug 30190; bugfix on 0.2.4.2-alpha.
- o Minor bugfixes (logging, backport from 0.4.2.1-alpha):
- - Change log level of message "Hash of session info was not as
- expected" to LOG_PROTOCOL_WARN. Fixes bug 12399; bugfix
- on 0.1.1.10-alpha.
- o Minor bugfixes (logging, backport from 0.4.2.2-alpha):
- - Rate-limit the logging message about the obsolete .exit
- notation. Previously, there was no limit on this warning, which
- could potentially be triggered many times by a hostile website.
- Fixes bug 31466; bugfix on 0.2.2.1-alpha.
- o Minor bugfixes (logging, protocol violations, backport from 0.4.2.2-alpha):
- - Do not log a nonfatal assertion failure when receiving a VERSIONS
- cell on a connection using the obsolete v1 link protocol. Log a
- protocol_warn instead. Fixes bug 31107; bugfix on 0.2.4.4-alpha.
- o Minor bugfixes (mainloop, periodic events, in-process API, backport from 0.4.2.3-alpha):
- - Reset the periodic events' "enabled" flag when Tor is shut down
- cleanly. Previously, this flag was left on, which caused periodic
- events not to be re-enabled when Tor was relaunched in-process
- with tor_api.h after a shutdown. Fixes bug 32058; bugfix
- on 0.3.3.1-alpha.
- o Minor bugfixes (memory leak, backport from 0.4.1.1-alpha):
- - Avoid a minor memory leak that could occur on relays when failing
- to create a "keys" directory. Fixes bug 30148; bugfix
- on 0.3.3.1-alpha.
- o Minor bugfixes (memory leak, backport from 0.4.1.4-rc):
- - Fix a trivial memory leak when parsing an invalid value
- from a download schedule in the configuration. Fixes bug
- 30894; bugfix on 0.3.4.1-alpha.
- o Minor bugfixes (memory management, backport from 0.4.0.3-alpha):
- - Refactor the shared random state's memory management so that it
- actually takes ownership of the shared random value pointers.
- Fixes bug 29706; bugfix on 0.2.9.1-alpha.
- o Minor bugfixes (memory management, testing, backport from 0.4.0.3-alpha):
- - Stop leaking parts of the shared random state in the shared-random
- unit tests. Fixes bug 29599; bugfix on 0.2.9.1-alpha.
- o Minor bugfixes (onion services, backport from 0.4.1.1-alpha):
- - Avoid a GCC 9.1.1 warning (and possible crash depending on libc
- implementation) when failing to load an onion service client
- authorization file. Fixes bug 30475; bugfix on 0.3.5.1-alpha.
- o Minor bugfixes (out-of-memory handler, backport from 0.4.1.2-alpha):
- - When purging the DNS cache because of an out-of-memory condition,
- try purging just the older entries at first. Previously, we would
- always purge the whole thing. Fixes bug 29617; bugfix
- on 0.3.5.1-alpha.
- o Minor bugfixes (portability, backport from 0.4.1.2-alpha):
- - Avoid crashing in our tor_vasprintf() implementation on systems
- that define neither vasprintf() nor _vscprintf(). (This bug has
- been here long enough that we question whether people are running
- Tor on such systems, but we're applying the fix out of caution.)
- Fixes bug 30561; bugfix on 0.2.8.2-alpha. Found and fixed by
- Tobias Stoeckmann.
- o Minor bugfixes (relay, backport from 0.4.2.2-alpha):
- - Avoid crashing when starting with a corrupt keys directory where
- the old ntor key and the new ntor key are identical. Fixes bug
- 30916; bugfix on 0.2.4.8-alpha.
- o Minor bugfixes (rust, backport from 0.4.0.5):
- - Abort on panic in all build profiles, instead of potentially
- unwinding into C code. Fixes bug 27199; bugfix on 0.3.3.1-alpha.
- o Minor bugfixes (rust, backport from 0.4.2.1-alpha):
- - Correctly exclude a redundant rust build job in Travis. Fixes bug
- 31463; bugfix on 0.3.5.4-alpha.
- o Minor bugfixes (single onion services, backport from 0.4.0.3-alpha):
- - Allow connections to single onion services to remain idle without
- being disconnected. Previously, relays acting as rendezvous points
- for single onion services were mistakenly closing idle rendezvous
- circuits after 60 seconds, thinking that they were unused
- directory-fetching circuits that had served their purpose. Fixes
- bug 29665; bugfix on 0.2.1.26.
- o Minor bugfixes (stats, backport from 0.4.0.3-alpha):
- - When ExtraInfoStatistics is 0, stop including PaddingStatistics in
- relay and bridge extra-info documents. Fixes bug 29017; bugfix
- on 0.3.1.1-alpha.
- o Minor bugfixes (testing, backport from 0.4.0.3-alpha):
- - Downgrade some LOG_ERR messages in the address/* tests to
- warnings. The LOG_ERR messages were occurring when we had no
- configured network. We were failing the unit tests, because we
- backported 28668 to 0.3.5.8, but did not backport 29530. Fixes bug
- 29530; bugfix on 0.3.5.8.
- - Fix our gcov wrapper script to look for object files at the
- correct locations. Fixes bug 29435; bugfix on 0.3.5.1-alpha.
- o Minor bugfixes (testing, backport from 0.4.0.4-rc):
- - Backport the 0.3.4 src/test/test-network.sh to 0.2.9. We need a
- recent test-network.sh to use new chutney features in CI. Fixes
- bug 29703; bugfix on 0.2.9.1-alpha.
- - Fix a test failure on Windows caused by an unexpected "BUG"
- warning in our tests for tor_gmtime_r(-1). Fixes bug 29922; bugfix
- on 0.2.9.3-alpha.
- o Minor bugfixes (testing, backport from 0.4.2.3-alpha):
- - When testing port rebinding, don't busy-wait for tor to log.
- Instead, actually sleep for a short time before polling again.
- Also improve the formatting of control commands and log messages.
- Fixes bug 31837; bugfix on 0.3.5.1-alpha.
- o Minor bugfixes (TLS protocol, backport form 0.4.0.4-rc):
- - When classifying a client's selection of TLS ciphers, if the
- client ciphers are not yet available, do not cache the result.
- Previously, we had cached the unavailability of the cipher list
- and never looked again, which in turn led us to assume that the
- client only supported the ancient V1 link protocol. This, in turn,
- was causing Stem integration tests to stall in some cases. Fixes
- bug 30021; bugfix on 0.2.4.8-alpha.
- o Minor bugfixes (tls, logging, backport from 0.4.2.3-alpha):
- - Log bugs about the TLS read buffer's length only once, rather than
- filling the logs with similar warnings. Fixes bug 31939; bugfix
- on 0.3.0.4-rc.
- o Minor bugfixes (v2 single onion services, backport from 0.4.2.1-alpha):
- - Always retry v2 single onion service intro and rend circuits with
- a 3-hop path. Previously, v2 single onion services used a 3-hop
- path when rendezvous circuits were retried after a remote or
- delayed failure, but a 1-hop path for immediate retries. Fixes bug
- 23818; bugfix on 0.2.9.3-alpha.
- - Make v3 single onion services fall back to a 3-hop intro, when all
- intro points are unreachable via a 1-hop path. Previously, v3
- single onion services failed when all intro nodes were unreachable
- via a 1-hop path. Fixes bug 23507; bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (Windows, CI, backport from 0.4.0.3-alpha):
- - Skip the Appveyor 32-bit Windows Server 2016 job, and 64-bit
- Windows Server 2012 R2 job. The remaining 2 jobs still provide
- coverage of 64/32-bit, and Windows Server 2016/2012 R2. Also set
- fast_finish, so failed jobs terminate the build immediately. Fixes
- bug 29601; bugfix on 0.3.5.4-alpha.
- o Documentation (backport from 0.4.2.1-alpha):
- - Use RFC 2397 data URL scheme to embed an image into tor-exit-
- notice.html so that operators no longer have to host it
- themselves. Closes ticket 31089.
- o Testing (backport from 0.4.1.2-alpha):
- - Specify torrc paths (with empty files) when launching tor in
- integration tests; refrain from reading user and system torrcs.
- Resolves issue 29702.
- o Testing (continuous integration, backport from 0.4.1.1-alpha):
- - In Travis, show stem's tor log after failure. Closes ticket 30234.
- o Testing (continuous integration, backport from 0.4.1.5):
- - In Travis, make stem log a controller trace to the console, and
- tail stem's tor log after failure. Closes ticket 30591.
- - In Travis, only run the stem tests that use a tor binary. Closes
- ticket 30694.
- o Testing (continuous integration, backport from 0.4.2.3-alpha):
- - Disable all but one Travis CI macOS build, to mitigate slow
- scheduling of Travis macOS jobs. Closes ticket 32177.
- - Run the chutney IPv6 networks as part of Travis CI. Closes
- ticket 30860.
- - Simplify the Travis CI build matrix, and optimise for build time.
- Closes ticket 31859.
- - Use Windows Server 2019 instead of Windows Server 2016 in our
- Appveyor builds. Closes ticket 32086.
- o Testing (continuous integration, backport from 0.4.2.4-rc):
- - Use Ubuntu Bionic images for our Travis CI builds, so we can get a
- recent version of coccinelle. But leave chutney on Ubuntu Trusty,
- until we can fix some Bionic permissions issues (see ticket
- 32240). Related to ticket 31919.
- - Install the mingw OpenSSL package in Appveyor. This makes sure
- that the OpenSSL headers and libraries match in Tor's Appveyor
- builds. (This bug was triggered by an Appveyor image update.)
- Fixes bug 32449; bugfix on 0.3.5.6-rc.
- - In Travis, use Xcode 11.2 on macOS 10.14. Closes ticket 32241.
- o Testing (continuous integration, backport from 0.4.2.5):
- - Require C99 standards-conforming code in Travis CI, but allow GNU gcc
- extensions. Also activates clang's -Wtypedef-redefinition warnings.
- Build some jobs with -std=gnu99, and some jobs without.
- Closes ticket 32500.
- Changes in version 0.4.1.6 - 2019-09-19
- This release backports several bugfixes to improve stability and
- correctness. Anyone experiencing build problems or crashes with 0.4.1.5,
- or experiencing reliability issues with single onion services, should
- upgrade.
- o Major bugfixes (crash, Linux, Android, backport from 0.4.2.1-alpha):
- - Tolerate systems (including some Android installations) where
- madvise and MADV_DONTDUMP are available at build-time, but not at
- run time. Previously, these systems would notice a failed syscall
- and abort. Fixes bug 31570; bugfix on 0.4.1.1-alpha.
- - Tolerate systems (including some Linux installations) where
- madvise and/or MADV_DONTFORK are available at build-time, but not
- at run time. Previously, these systems would notice a failed
- syscall and abort. Fixes bug 31696; bugfix on 0.4.1.1-alpha.
- o Minor features (stem tests, backport from 0.4.2.1-alpha):
- - Change "make test-stem" so it only runs the stem tests that use
- tor. This change makes test-stem faster and more reliable. Closes
- ticket 31554.
- o Minor bugfixes (build system, backport form 0.4.2.1-alpha):
- - Do not include the deprecated <sys/sysctl.h> on Linux or Windows
- systems. Fixes bug 31673; bugfix on 0.2.5.4-alpha.
- o Minor bugfixes (compilation, backport from 0.4.2.1-alpha):
- - Add more stub functions to fix compilation on Android with link-
- time optimization when --disable-module-dirauth is used.
- Previously, these compilation settings would make the compiler
- look for functions that didn't exist. Fixes bug 31552; bugfix
- on 0.4.1.1-alpha.
- - Suppress spurious float-conversion warnings from GCC when calling
- floating-point classifier functions on FreeBSD. Fixes part of bug
- 31687; bugfix on 0.3.1.5-alpha.
- o Minor bugfixes (controller protocol):
- - Fix the MAPADDRESS controller command to accept one or more
- arguments. Previously, it required two or more arguments, and ignored
- the first. Fixes bug 31772; bugfix on 0.4.1.1-alpha.
- o Minor bugfixes (FreeBSD, PF-based proxy, IPv6, backport from 0.4.2.1-alpha):
- - When extracting an IPv6 address from a PF-based proxy, verify that
- we are actually configured to receive an IPv6 address, and log an
- internal error if not. Fixes part of bug 31687; bugfix
- on 0.2.3.4-alpha.
- o Minor bugfixes (guards, backport from 0.4.2.1-alpha):
- - When tor is missing descriptors for some primary entry guards,
- make the log message less alarming. It's normal for descriptors to
- expire, as long as tor fetches new ones soon after. Fixes bug
- 31657; bugfix on 0.3.3.1-alpha.
- o Minor bugfixes (logging, backport from 0.4.2.1-alpha):
- - Change log level of message "Hash of session info was not as
- expected" to LOG_PROTOCOL_WARN. Fixes bug 12399; bugfix
- on 0.1.1.10-alpha.
- o Minor bugfixes (rust, backport from 0.4.2.1-alpha):
- - Correctly exclude a redundant rust build job in Travis. Fixes bug
- 31463; bugfix on 0.3.5.4-alpha.
- o Minor bugfixes (v2 single onion services, backport from 0.4.2.1-alpha):
- - Always retry v2 single onion service intro and rend circuits with
- a 3-hop path. Previously, v2 single onion services used a 3-hop
- path when rendezvous circuits were retried after a remote or
- delayed failure, but a 1-hop path for immediate retries. Fixes bug
- 23818; bugfix on 0.2.9.3-alpha.
- o Minor bugfixes (v3 single onion services, backport from 0.4.2.1-alpha):
- - Always retry v3 single onion service intro and rend circuits with
- a 3-hop path. Previously, v3 single onion services used a 3-hop
- path when rend circuits were retried after a remote or delayed
- failure, but a 1-hop path for immediate retries. Fixes bug 23818;
- bugfix on 0.3.2.1-alpha.
- - Make v3 single onion services fall back to a 3-hop intro, when all
- intro points are unreachable via a 1-hop path. Previously, v3
- single onion services failed when all intro nodes were unreachable
- via a 1-hop path. Fixes bug 23507; bugfix on 0.3.2.1-alpha.
- o Documentation (backport from 0.4.2.1-alpha):
- - Use RFC 2397 data URL scheme to embed an image into tor-exit-
- notice.html so that operators no longer have to host it
- themselves. Closes ticket 31089.
- Changes in version 0.4.1.5 - 2019-08-20
- This is the first stable release in the 0.4.1.x series. This series
- adds experimental circuit-level padding, authenticated SENDME cells to
- defend against certain attacks, and several performance improvements
- to save on CPU consumption. It fixes bugs in bootstrapping and v3
- onion services. It also includes numerous smaller features and
- bugfixes on earlier versions.
- Per our support policy, we will support the 0.4.1.x series for nine
- months, or until three months after the release of a stable 0.4.2.x:
- whichever is longer. If you need longer-term support, please stick
- with 0.3.5.x, which will we plan to support until Feb 2022.
- Below are the changes since 0.4.0.5. For a list of only the changes
- since 0.4.1.4-rc, see the ChangeLog file.
- o Directory authority changes:
- - The directory authority "dizum" has a new IP address. Closes
- ticket 31406.
- o Major features (circuit padding):
- - Onion service clients now add padding cells at the start of their
- INTRODUCE and RENDEZVOUS circuits, to make those circuits' traffic
- look more like general purpose Exit traffic. The overhead for this
- is 2 extra cells in each direction for RENDEZVOUS circuits, and 1
- extra upstream cell and 10 downstream cells for INTRODUCE
- circuits. This feature is only enabled when also supported by the
- circuit's middle node. (Clients may specify fixed middle nodes
- with the MiddleNodes option, and may force-disable this feature
- with the CircuitPadding option.) Closes ticket 28634.
- o Major features (code organization):
- - Tor now includes a generic publish-subscribe message-passing
- subsystem that we can use to organize intermodule dependencies. We
- hope to use this to reduce dependencies between modules that don't
- need to be related, and to generally simplify our codebase. Closes
- ticket 28226.
- o Major features (controller protocol):
- - Controller commands are now parsed using a generalized parsing
- subsystem. Previously, each controller command was responsible for
- parsing its own input, which led to strange inconsistencies.
- Closes ticket 30091.
- o Major features (flow control):
- - Implement authenticated SENDMEs as detailed in proposal 289. A
- SENDME cell now includes the digest of the traffic that it
- acknowledges, so that once an end point receives the SENDME, it
- can confirm the other side's knowledge of the previous cells that
- were sent, and prevent certain types of denial-of-service attacks.
- This behavior is controlled by two new consensus parameters: see
- the proposal for more details. Fixes ticket 26288.
- o Major features (performance):
- - Our node selection algorithm now excludes nodes in linear time.
- Previously, the algorithm was quadratic, which could slow down
- heavily used onion services. Closes ticket 30307.
- o Major features (performance, RNG):
- - Tor now constructs a fast secure pseudorandom number generator for
- each thread, to use when performance is critical. This PRNG is
- based on AES-CTR, using a buffering construction similar to
- libottery and the (newer) OpenBSD arc4random() code. It
- outperforms OpenSSL 1.1.1a's CSPRNG by roughly a factor of 100 for
- small outputs. Although we believe it to be cryptographically
- strong, we are only using it when necessary for performance.
- Implements tickets 29023 and 29536.
- o Major bugfixes (bridges):
- - Consider our directory information to have changed when our list
- of bridges changes. Previously, Tor would not re-compute the
- status of its directory information when bridges changed, and
- therefore would not realize that it was no longer able to build
- circuits. Fixes part of bug 29875.
- - Do not count previously configured working bridges towards our
- total of working bridges. Previously, when Tor's list of bridges
- changed, it would think that the old bridges were still usable,
- and delay fetching router descriptors for the new ones. Fixes part
- of bug 29875; bugfix on 0.3.0.1-alpha.
- o Major bugfixes (circuit build, guard):
- - On relays, properly check that a padding machine is absent before
- logging a warning about it being absent. Fixes bug 30649; bugfix
- on 0.4.0.1-alpha.
- - When considering upgrading circuits from "waiting for guard" to
- "open", always ignore circuits that are marked for close. Otherwise,
- we can end up in the situation where a subsystem is notified that
- a closing circuit has just opened, leading to undesirable
- behavior. Fixes bug 30871; bugfix on 0.3.0.1-alpha.
- o Major bugfixes (onion service reachability):
- - Properly clean up the introduction point map when circuits change
- purpose from onion service circuits to pathbias, measurement, or
- other circuit types. This should fix some service-side instances
- of introduction point failure. Fixes bug 29034; bugfix
- on 0.3.2.1-alpha.
- o Major bugfixes (onion service v3):
- - Fix an unreachable bug in which an introduction point could try to
- send an INTRODUCE_ACK with a status code that Trunnel would refuse
- to encode, leading the relay to assert(). We've consolidated the
- ABI values into Trunnel now. Fixes bug 30454; bugfix
- on 0.3.0.1-alpha.
- - Clients can now handle unknown status codes from INTRODUCE_ACK
- cells. (The NACK behavior will stay the same.) This will allow us
- to extend status codes in the future without breaking the normal
- client behavior. Fixes another part of bug 30454; bugfix
- on 0.3.0.1-alpha.
- o Minor features (authenticated SENDME):
- - Ensure that there is enough randomness on every circuit to prevent
- an attacker from successfully predicting the hashes they will need
- to include in authenticated SENDME cells. At a random interval, if
- we have not sent randomness already, we now leave some extra space
- at the end of a cell that we can fill with random bytes. Closes
- ticket 26846.
- o Minor features (circuit padding logging):
- - Demote noisy client-side warn logs about circuit padding to protocol
- warnings. Add additional log messages and circuit ID fields to help
- with bug 30992 and any other future issues.
- o Minor features (circuit padding):
- - We now use a fast PRNG when scheduling circuit padding. Part of
- ticket 28636.
- - Allow the padding machine designer to pick the edges of their
- histogram instead of trying to compute them automatically using an
- exponential formula. Resolves some undefined behavior in the case
- of small histograms and allows greater flexibility on machine
- design. Closes ticket 29298; bugfix on 0.4.0.1-alpha.
- - Allow circuit padding machines to hold a circuit open until they
- are done padding it. Closes ticket 28780.
- o Minor features (compile-time modules):
- - Add a "--list-modules" command to print a list of which compile-
- time modules are enabled. Closes ticket 30452.
- o Minor features (continuous integration):
- - Our Travis configuration now uses Chutney to run some network
- integration tests automatically. Closes ticket 29280.
- - When running coverage builds on Travis, we now set
- TOR_TEST_RNG_SEED, to avoid RNG-based coverage differences. Part
- of ticket 28878.
- - Remove sudo configuration lines from .travis.yml as they are no
- longer needed with current Travis build environment. Resolves
- issue 30213.
- - In Travis, show stem's tor log after failure. Closes ticket 30234.
- o Minor features (controller):
- - Add onion service version 3 support to the HSFETCH command.
- Previously, only version 2 onion services were supported. Closes
- ticket 25417. Patch by Neel Chauhan.
- o Minor features (debugging):
- - Introduce tor_assertf() and tor_assertf_nonfatal() to enable
- logging of additional information during assert failure. Now we
- can use format strings to include information for trouble
- shooting. Resolves ticket 29662.
- o Minor features (defense in depth):
- - In smartlist_remove_keeporder(), set unused pointers to NULL, in
- case a bug causes them to be used later. Closes ticket 30176.
- Patch from Tobias Stoeckmann.
- - Tor now uses a cryptographically strong PRNG even for decisions
- that we do not believe are security-sensitive. Previously, for
- performance reasons, we had used a trivially predictable linear
- congruential generator algorithm for certain load-balancing and
- statistical sampling decisions. Now we use our fast RNG in those
- cases. Closes ticket 29542.
- o Minor features (developer tools):
- - Tor's "practracker" test script now checks for files and functions
- that seem too long and complicated. Existing overlong functions
- and files are accepted for now, but should eventually be
- refactored. Closes ticket 29221.
- - Add some scripts used for git maintenance to scripts/git. Closes
- ticket 29391.
- - Call practracker from pre-push and pre-commit git hooks to let
- developers know if they made any code style violations. Closes
- ticket 30051.
- - Add a script to check that each header has a well-formed and
- unique guard macro. Closes ticket 29756.
- o Minor features (fallback directory list):
- - Replace the 157 fallbacks originally introduced in Tor 0.3.5.6-rc
- in December 2018 (of which ~122 were still functional), with a
- list of 148 fallbacks (70 new, 78 existing, 79 removed) generated
- in June 2019. Closes ticket 28795.
- o Minor features (geoip):
- - Update geoip and geoip6 to the June 10 2019 Maxmind GeoLite2
- Country database. Closes ticket 30852.
- - Update geoip and geoip6 to the May 13 2019 Maxmind GeoLite2
- Country database. Closes ticket 30522.
- o Minor features (HTTP tunnel):
- - Return an informative web page when the HTTPTunnelPort is used as
- an HTTP proxy. Closes ticket 27821, patch by "eighthave".
- o Minor features (IPv6, v3 onion services):
- - Make v3 onion services put IPv6 addresses in service descriptors.
- Before this change, service descriptors only contained IPv4
- addresses. Implements 26992.
- o Minor features (logging):
- - Give a more useful assertion failure message if we think we have
- minherit() but we fail to make a region non-inheritable. Give a
- compile-time warning if our support for minherit() is incomplete.
- Closes ticket 30686.
- o Minor features (maintenance):
- - Add a new "make autostyle" target that developers can use to apply
- all automatic Tor style and consistency conversions to the
- codebase. Closes ticket 30539.
- o Minor features (modularity):
- - The "--disable-module-dirauth" compile-time option now disables
- even more dirauth-only code. Closes ticket 30345.
- o Minor features (performance):
- - Use OpenSSL's implementations of SHA3 when available (in OpenSSL
- 1.1.1 and later), since they tend to be faster than tiny-keccak.
- Closes ticket 28837.
- o Minor features (testing):
- - The circuitpadding tests now use a reproducible RNG implementation,
- so that if a test fails, we can learn why. Part of ticket 28878.
- - Tor's tests now support an environment variable, TOR_TEST_RNG_SEED,
- to set the RNG seed for tests that use a reproducible RNG. Part of
- ticket 28878.
- - When running tests in coverage mode, take additional care to make
- our coverage deterministic, so that we can accurately track
- changes in code coverage. Closes ticket 30519.
- - Tor's unit test code now contains helper functions to replace the
- PRNG with a deterministic or reproducible version for testing.
- Previously, various tests implemented this in various ways.
- Implements ticket 29732.
- - We now have a script, cov-test-determinism.sh, to identify places
- where our unit test coverage has become nondeterministic. Closes
- ticket 29436.
- - Check that representative subsets of values of `int` and `unsigned
- int` can be represented by `void *`. Resolves issue 29537.
- o Minor bugfixes (bridge authority):
- - Bridge authorities now set bridges as running or non-running when
- about to dump their status to a file. Previously, they set bridges
- as running in response to a GETINFO command, but those shouldn't
- modify data structures. Fixes bug 24490; bugfix on 0.2.0.13-alpha.
- Patch by Neel Chauhan.
- o Minor bugfixes (channel padding statistics):
- - Channel padding write totals and padding-enabled totals are now
- counted properly in relay extrainfo descriptors. Fixes bug 29231;
- bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (circuit isolation):
- - Fix a logic error that prevented the SessionGroup sub-option from
- being accepted. Fixes bug 22619; bugfix on 0.2.7.2-alpha.
- o Minor bugfixes (circuit padding):
- - Add a "CircuitPadding" torrc option to disable circuit padding.
- Fixes bug 28693; bugfix on 0.4.0.1-alpha.
- - Allow circuit padding machines to specify that they do not
- contribute much overhead, and provide consensus flags and torrc
- options to force clients to only use these low overhead machines.
- Fixes bug 29203; bugfix on 0.4.0.1-alpha.
- - Provide a consensus parameter to fully disable circuit padding, to
- be used in emergency network overload situations. Fixes bug 30173;
- bugfix on 0.4.0.1-alpha.
- - The circuit padding subsystem will no longer schedule padding if
- dormant mode is enabled. Fixes bug 28636; bugfix on 0.4.0.1-alpha.
- - Inspect a circuit-level cell queue before sending padding, to
- avoid sending padding while too much data is already queued. Fixes
- bug 29204; bugfix on 0.4.0.1-alpha.
- - Avoid calling monotime_absolute_usec() in circuit padding machines
- that do not use token removal or circuit RTT estimation. Fixes bug
- 29085; bugfix on 0.4.0.1-alpha.
- o Minor bugfixes (clock skew detection):
- - Don't believe clock skew results from NETINFO cells that appear to
- arrive before we sent the VERSIONS cells they are responding to.
- Previously, we would accept them up to 3 minutes "in the past".
- Fixes bug 31343; bugfix on 0.2.4.4-alpha.
- o Minor bugfixes (compatibility, standards compliance):
- - Fix a bug that would invoke undefined behavior on certain
- operating systems when trying to asprintf() a string exactly
- INT_MAX bytes long. We don't believe this is exploitable, but it's
- better to fix it anyway. Fixes bug 31001; bugfix on 0.2.2.11-alpha.
- Found and fixed by Tobias Stoeckmann.
- o Minor bugfixes (compilation warning):
- - Fix a compilation warning on Windows about casting a function
- pointer for GetTickCount64(). Fixes bug 31374; bugfix on
- 0.2.9.1-alpha.
- o Minor bugfixes (compilation):
- - Avoid using labs() on time_t, which can cause compilation warnings
- on 64-bit Windows builds. Fixes bug 31343; bugfix on 0.2.4.4-alpha.
- o Minor bugfixes (compilation, unusual configurations):
- - Avoid failures when building with the ALL_BUGS_ARE_FATAL option
- due to missing declarations of abort(), and prevent other such
- failures in the future. Fixes bug 30189; bugfix on 0.3.4.1-alpha.
- o Minor bugfixes (configuration, proxies):
- - Fix a bug that prevented us from supporting SOCKS5 proxies that
- want authentication along with configured (but unused!)
- ClientTransportPlugins. Fixes bug 29670; bugfix on 0.2.6.1-alpha.
- o Minor bugfixes (continuous integration):
- - Allow the test-stem job to fail in Travis, because it sometimes
- hangs. Fixes bug 30744; bugfix on 0.3.5.4-alpha.
- - Skip test_rebind on macOS in Travis, because it is unreliable on
- macOS on Travis. Fixes bug 30713; bugfix on 0.3.5.1-alpha.
- - Skip test_rebind when the TOR_SKIP_TEST_REBIND environment
- variable is set. Fixes bug 30713; bugfix on 0.3.5.1-alpha.
- o Minor bugfixes (controller protocol):
- - Teach the controller parser to distinguish an object preceded by
- an argument list from one without. Previously, it couldn't
- distinguish an argument list from the first line of a multiline
- object. Fixes bug 29984; bugfix on 0.2.3.8-alpha.
- o Minor bugfixes (crash on exit):
- - Avoid a set of possible code paths that could try to use freed
- memory in routerlist_free() while Tor was exiting. Fixes bug
- 31003; bugfix on 0.1.2.2-alpha.
- o Minor bugfixes (developer tooling):
- - Fix pre-push hook to allow fixup and squash commits when pushing
- to non-upstream git remote. Fixes bug 30286; bugfix
- on 0.4.0.1-alpha.
- o Minor bugfixes (directory authorities):
- - Stop crashing after parsing an unknown descriptor purpose
- annotation. We think this bug can only be triggered by modifying a
- local file. Fixes bug 30781; bugfix on 0.2.0.8-alpha.
- - Move the "bandwidth-file-headers" line in directory authority
- votes so that it conforms to dir-spec.txt. Fixes bug 30316; bugfix
- on 0.3.5.1-alpha.
- - Directory authorities with IPv6 support now always mark themselves
- as reachable via IPv6. Fixes bug 24338; bugfix on 0.2.4.1-alpha.
- Patch by Neel Chauhan.
- o Minor bugfixes (documentation):
- - Improve the documentation for using MapAddress with ".exit". Fixes
- bug 30109; bugfix on 0.1.0.1-rc.
- - Improve the monotonic time module and function documentation to
- explain what "monotonic" actually means, and document some results
- that have surprised people. Fixes bug 29640; bugfix
- on 0.2.9.1-alpha.
- - Use proper formatting when providing an example on quoting options
- that contain whitespace. Fixes bug 29635; bugfix on 0.2.3.18-rc.
- o Minor bugfixes (logging):
- - Do not log a warning when running with an OpenSSL version other
- than the one Tor was compiled with, if the two versions should be
- compatible. Previously, we would warn whenever the version was
- different. Fixes bug 30190; bugfix on 0.2.4.2-alpha.
- - Warn operators when the MyFamily option is set but ContactInfo is
- missing, as the latter should be set too. Fixes bug 25110; bugfix
- on 0.3.3.1-alpha.
- o Minor bugfixes (memory leaks):
- - Avoid a minor memory leak that could occur on relays when failing
- to create a "keys" directory. Fixes bug 30148; bugfix
- on 0.3.3.1-alpha.
- - Fix a trivial memory leak when parsing an invalid value from a
- download schedule in the configuration. Fixes bug 30894; bugfix
- on 0.3.4.1-alpha.
- o Minor bugfixes (NetBSD):
- - Fix usage of minherit() on NetBSD and other platforms that define
- MAP_INHERIT_{ZERO,NONE} instead of INHERIT_{ZERO,NONE}. Fixes bug
- 30614; bugfix on 0.4.0.2-alpha. Patch from Taylor Campbell.
- o Minor bugfixes (onion services):
- - Avoid a GCC 9.1.1 warning (and possible crash depending on libc
- implementation) when failing to load an onion service client
- authorization file. Fixes bug 30475; bugfix on 0.3.5.1-alpha.
- - When refusing to launch a controller's HSFETCH request because of
- rate-limiting, respond to the controller with a new response,
- "QUERY_RATE_LIMITED". Previously, we would log QUERY_NO_HSDIR for
- this case. Fixes bug 28269; bugfix on 0.3.1.1-alpha. Patch by
- Neel Chauhan.
- - When relaunching a circuit to a rendezvous service, mark the
- circuit as needing high-uptime routers as appropriate. Fixes bug
- 17357; bugfix on 0.1.0.1-rc. Patch by Neel Chauhan.
- - Stop ignoring IPv6 link specifiers sent to v3 onion services.
- (IPv6 support for v3 onion services is still incomplete: see
- ticket 23493 for details.) Fixes bug 23588; bugfix on
- 0.3.2.1-alpha. Patch by Neel Chauhan.
- o Minor bugfixes (onion services, performance):
- - When building circuits to onion services, call tor_addr_parse()
- less often. Previously, we called tor_addr_parse() in
- circuit_is_acceptable() even if its output wasn't used. This
- change should improve performance when building circuits. Fixes
- bug 22210; bugfix on 0.2.8.12. Patch by Neel Chauhan.
- o Minor bugfixes (out-of-memory handler):
- - When purging the DNS cache because of an out-of-memory condition,
- try purging just the older entries at first. Previously, we would
- always purge the whole thing. Fixes bug 29617; bugfix
- on 0.3.5.1-alpha.
- o Minor bugfixes (performance):
- - When checking whether a node is a bridge, use a fast check to make
- sure that its identity is set. Previously, we used a constant-time
- check, which is not necessary in this case. Fixes bug 30308;
- bugfix on 0.3.5.1-alpha.
- o Minor bugfixes (pluggable transports):
- - Tor now sets TOR_PT_EXIT_ON_STDIN_CLOSE=1 for client transports as
- well as servers. Fixes bug 25614; bugfix on 0.2.7.1-alpha.
- o Minor bugfixes (portability):
- - Avoid crashing in our tor_vasprintf() implementation on systems
- that define neither vasprintf() nor _vscprintf(). (This bug has
- been here long enough that we question whether people are running
- Tor on such systems, but we're applying the fix out of caution.)
- Fixes bug 30561; bugfix on 0.2.8.2-alpha. Found and fixed by
- Tobias Stoeckmann.
- o Minor bugfixes (probability distributions):
- - Refactor and improve parts of the probability distribution code
- that made Coverity complain. Fixes bug 29805; bugfix
- on 0.4.0.1-alpha.
- o Minor bugfixes (python):
- - Stop assuming that /usr/bin/python3 exists. For scripts that work
- with python2, use /usr/bin/python. Otherwise, use /usr/bin/env
- python3. Fixes bug 29913; bugfix on 0.2.5.3-alpha.
- o Minor bugfixes (relay):
- - When running as a relay, if IPv6Exit is set to 1 while ExitRelay
- is auto, act as if ExitRelay is 1. Previously, we would ignore
- IPv6Exit if ExitRelay was 0 or auto. Fixes bug 29613; bugfix on
- 0.3.5.1-alpha. Patch by Neel Chauhan.
- o Minor bugfixes (static analysis):
- - Fix several spurious Coverity warnings about the unit tests, to
- lower our chances of missing real warnings in the future. Fixes
- bug 30150; bugfix on 0.3.5.1-alpha and various other Tor versions.
- o Minor bugfixes (stats):
- - When ExtraInfoStatistics is 0, stop including bandwidth usage
- statistics, GeoIPFile hashes, ServerTransportPlugin lines, and
- bridge statistics by country in extra-info documents. Fixes bug
- 29018; bugfix on 0.2.4.1-alpha.
- o Minor bugfixes (testing):
- - Call setrlimit() to disable core dumps in test_bt_cl.c. Previously
- we used `ulimit -c` in test_bt.sh, which violates POSIX shell
- compatibility. Fixes bug 29061; bugfix on 0.3.5.1-alpha.
- - Fix some incorrect code in the v3 onion service unit tests. Fixes
- bug 29243; bugfix on 0.3.2.1-alpha.
- - In the "routerkeys/*" tests, check the return values of mkdir()
- for possible failures. Fixes bug 29939; bugfix on 0.2.7.2-alpha.
- Found by Coverity as CID 1444254.
- - Split test_utils_general() into several smaller test functions.
- This makes it easier to perform resource deallocation on assert
- failure, and fixes Coverity warnings CID 1444117 and CID 1444118.
- Fixes bug 29823; bugfix on 0.2.9.1-alpha.
- o Minor bugfixes (tor-resolve):
- - Fix a memory leak in tor-resolve that could happen if Tor gave it
- a malformed SOCKS response. (Memory leaks in tor-resolve don't
- actually matter, but it's good to fix them anyway.) Fixes bug
- 30151; bugfix on 0.4.0.1-alpha.
- o Code simplification and refactoring:
- - Abstract out the low-level formatting of replies on the control
- port. Implements ticket 30007.
- - Add several assertions in an attempt to fix some Coverity
- warnings. Closes ticket 30149.
- - Introduce a connection_dir_buf_add() helper function that checks
- for compress_state of dir_connection_t and automatically writes a
- string to directory connection with or without compression.
- Resolves issue 28816.
- - Make the base32_decode() API return the number of bytes written,
- for consistency with base64_decode(). Closes ticket 28913.
- - Move most relay-only periodic events out of mainloop.c into the
- relay subsystem. Closes ticket 30414.
- - Refactor and encapsulate parts of the codebase that manipulate
- crypt_path_t objects. Resolves issue 30236.
- - Refactor several places in our code that Coverity incorrectly
- believed might have memory leaks. Closes ticket 30147.
- - Remove redundant return values in crypto_format, and the
- associated return value checks elsewhere in the code. Make the
- implementations in crypto_format consistent, and remove redundant
- code. Resolves ticket 29660.
- - Rename tor_mem_is_zero() to fast_mem_is_zero(), to emphasize that
- it is not a constant-time function. Closes ticket 30309.
- - Replace hs_desc_link_specifier_t with link_specifier_t, and remove
- all hs_desc_link_specifier_t-specific code. Fixes bug 22781;
- bugfix on 0.3.2.1-alpha.
- - Simplify v3 onion service link specifier handling code. Fixes bug
- 23576; bugfix on 0.3.2.1-alpha.
- - Split crypto_digest.c into NSS code, OpenSSL code, and shared
- code. Resolves ticket 29108.
- - Split control.c into several submodules, in preparation for
- distributing its current responsibilities throughout the codebase.
- Closes ticket 29894.
- - Start to move responsibility for knowing about periodic events to
- the appropriate subsystems, so that the mainloop doesn't need to
- know all the periodic events in the rest of the codebase.
- Implements tickets 30293 and 30294.
- o Documentation:
- - Mention URLs for Travis/Appveyor/Jenkins in ReleasingTor.md.
- Closes ticket 30630.
- - Document how to find git commits and tags for bug fixes in
- CodingStandards.md. Update some file documentation. Closes
- ticket 30261.
- o Removed features:
- - Remove the linux-tor-prio.sh script from contrib/operator-tools
- directory. Resolves issue 29434.
- - Remove the obsolete OpenSUSE initscript. Resolves issue 30076.
- - Remove the obsolete script at contrib/dist/tor.sh.in. Resolves
- issue 30075.
- o Testing:
- - Specify torrc paths (with empty files) when launching tor in
- integration tests; refrain from reading user and system torrcs.
- Resolves issue 29702.
- o Code simplification and refactoring (shell scripts):
- - Clean up many of our shell scripts to fix shellcheck warnings.
- These include autogen.sh (ticket 26069), test_keygen.sh (ticket
- 29062), test_switch_id.sh (ticket 29065), test_rebind.sh (ticket
- 29063), src/test/fuzz/minimize.sh (ticket 30079), test_rust.sh
- (ticket 29064), torify (ticket 29070), asciidoc-helper.sh (29926),
- fuzz_multi.sh (30077), fuzz_static_testcases.sh (ticket 29059),
- nagios-check-tor-authority-cert (ticket 29071),
- src/test/fuzz/fixup_filenames.sh (ticket 30078), test-network.sh
- (ticket 29060), test_key_expiration.sh (ticket 30002),
- zero_length_keys.sh (ticket 29068), and test_workqueue_*.sh
- (ticket 29067).
- o Testing (chutney):
- - In "make test-network-all", test IPv6-only v3 single onion
- services, using the chutney network single-onion-v23-ipv6-md.
- Closes ticket 27251.
- o Testing (continuous integration):
- - In Travis, make stem log a controller trace to the console, and tail
- stem's tor log after failure. Closes ticket 30591.
- - In Travis, only run the stem tests that use a tor binary.
- Closes ticket 30694.
- Changes in version 0.4.0.5 - 2019-05-02
- This is the first stable release in the 0.4.0.x series. It contains
- improvements for power management and bootstrap reporting, as well as
- preliminary backend support for circuit padding to prevent some kinds
- of traffic analysis. It also continues our work in refactoring Tor for
- long-term maintainability.
- Per our support policy, we will support the 0.4.0.x series for nine
- months, or until three months after the release of a stable 0.4.1.x:
- whichever is longer. If you need longer-term support, please stick
- with 0.3.5.x, which will we plan to support until Feb 2022.
- Below are the changes since 0.3.5.7. For a complete list of changes
- since 0.4.0.4-rc, see the ChangeLog file.
- o Major features (battery management, client, dormant mode):
- - When Tor is running as a client, and it is unused for a long time,
- it can now enter a "dormant" state. When Tor is dormant, it avoids
- network and CPU activity until it is reawoken either by a user
- request or by a controller command. For more information, see the
- configuration options starting with "Dormant". Implements tickets
- 2149 and 28335.
- - The client's memory of whether it is "dormant", and how long it
- has spent idle, persists across invocations. Implements
- ticket 28624.
- - There is a DormantOnFirstStartup option that integrators can use
- if they expect that in many cases, Tor will be installed but
- not used.
- o Major features (bootstrap reporting):
- - When reporting bootstrap progress, report the first connection
- uniformly, regardless of whether it's a connection for building
- application circuits. This allows finer-grained reporting of early
- progress than previously possible, with the improvements of ticket
- 27169. Closes tickets 27167 and 27103. Addresses ticket 27308.
- - When reporting bootstrap progress, treat connecting to a proxy or
- pluggable transport as separate from having successfully used that
- proxy or pluggable transport to connect to a relay. Closes tickets
- 27100 and 28884.
- o Major features (circuit padding):
- - Implement preliminary support for the circuit padding portion of
- Proposal 254. The implementation supports Adaptive Padding (aka
- WTF-PAD) state machines for use between experimental clients and
- relays. Support is also provided for APE-style state machines that
- use probability distributions instead of histograms to specify
- inter-packet delay. At the moment, Tor does not provide any
- padding state machines that are used in normal operation: for now,
- this feature exists solely for experimentation. Closes
- ticket 28142.
- o Major features (refactoring):
- - Tor now uses an explicit list of its own subsystems when
- initializing and shutting down. Previously, these systems were
- managed implicitly in various places throughout the codebase.
- (There may still be some subsystems using the old system.) Closes
- ticket 28330.
- o Major bugfixes (cell scheduler, KIST, security):
- - Make KIST consider the outbuf length when computing what it can
- put in the outbuf. Previously, KIST acted as though the outbuf
- were empty, which could lead to the outbuf becoming too full. It
- is possible that an attacker could exploit this bug to cause a Tor
- client or relay to run out of memory and crash. Fixes bug 29168;
- bugfix on 0.3.2.1-alpha. This issue is also being tracked as
- TROVE-2019-001 and CVE-2019-8955.
- o Major bugfixes (networking):
- - Gracefully handle empty username/password fields in SOCKS5
- username/password auth message and allow SOCKS5 handshake to
- continue. Previously, we had rejected these handshakes, breaking
- certain applications. Fixes bug 29175; bugfix on 0.3.5.1-alpha.
- o Major bugfixes (NSS, relay):
- - When running with NSS, disable TLS 1.2 ciphersuites that use
- SHA384 for their PRF. Due to an NSS bug, the TLS key exporters for
- these ciphersuites don't work -- which caused relays to fail to
- handshake with one another when these ciphersuites were enabled.
- Fixes bug 29241; bugfix on 0.3.5.1-alpha.
- o Minor features (address selection):
- - Treat the subnet 100.64.0.0/10 as public for some purposes;
- private for others. This subnet is the RFC 6598 (Carrier Grade
- NAT) IP range, and is deployed by many ISPs as an alternative to
- RFC 1918 that does not break existing internal networks. Tor now
- blocks SOCKS and control ports on these addresses and warns users
- if client ports or ExtORPorts are listening on a RFC 6598 address.
- Closes ticket 28525. Patch by Neel Chauhan.
- o Minor features (bandwidth authority):
- - Make bandwidth authorities ignore relays that are reported in the
- bandwidth file with the flag "vote=0". This change allows us to
- report unmeasured relays for diagnostic reasons without including
- their bandwidth in the bandwidth authorities' vote. Closes
- ticket 29806.
- - When a directory authority is using a bandwidth file to obtain the
- bandwidth values that will be included in the next vote, serve
- this bandwidth file at /tor/status-vote/next/bandwidth. Closes
- ticket 21377.
- o Minor features (bootstrap reporting):
- - When reporting bootstrap progress, stop distinguishing between
- situations where only internal paths are available and situations
- where external paths are available. Previously, Tor would often
- erroneously report that it had only internal paths. Closes
- ticket 27402.
- o Minor features (compilation):
- - Compile correctly when OpenSSL is built with engine support
- disabled, or with deprecated APIs disabled. Closes ticket 29026.
- Patches from "Mangix".
- o Minor features (continuous integration):
- - On Travis Rust builds, cleanup Rust registry and refrain from
- caching the "target/" directory to speed up builds. Resolves
- issue 29962.
- - Log Python version during each Travis CI job. Resolves
- issue 28551.
- - In Travis, tell timelimit to use stem's backtrace signals, and
- launch python directly from timelimit, so python receives the
- signals from timelimit, rather than make. Closes ticket 30117.
- o Minor features (controller):
- - Add a DROPOWNERSHIP command to undo the effects of TAKEOWNERSHIP.
- Implements ticket 28843.
- o Minor features (developer tooling):
- - Check that bugfix versions in changes files look like Tor versions
- from the versions spec. Warn when bugfixes claim to be on a future
- release. Closes ticket 27761.
- - Provide a git pre-commit hook that disallows committing if we have
- any failures in our code and changelog formatting checks. It is
- now available in scripts/maint/pre-commit.git-hook. Implements
- feature 28976.
- - Provide a git hook script to prevent "fixup!" and "squash!"
- commits from ending up in the master branch, as scripts/main/pre-
- push.git-hook. Closes ticket 27993.
- o Minor features (diagnostic):
- - Add more diagnostic log messages in an attempt to solve the issue
- of NUL bytes appearing in a microdescriptor cache. Related to
- ticket 28223.
- o Minor features (directory authority):
- - When a directory authority is using a bandwidth file to obtain
- bandwidth values, include the digest of that file in the vote.
- Closes ticket 26698.
- - Directory authorities support a new consensus algorithm, under
- which the family lines in microdescriptors are encoded in a
- canonical form. This change makes family lines more compressible
- in transit, and on the client. Closes ticket 28266; implements
- proposal 298.
- o Minor features (directory authority, relay):
- - Authorities now vote on a "StaleDesc" flag to indicate that a
- relay's descriptor is so old that the relay should upload again
- soon. Relays treat this flag as a signal to upload a new
- descriptor. This flag will eventually let us remove the
- 'published' date from routerstatus entries, and make our consensus
- diffs much smaller. Closes ticket 26770; implements proposal 293.
- o Minor features (dormant mode):
- - Add a DormantCanceledByStartup option to tell Tor that it should
- treat a startup event as cancelling any previous dormant state.
- Integrators should use this option with caution: it should only be
- used if Tor is being started because of something that the user
- did, and not if Tor is being automatically started in the
- background. Closes ticket 29357.
- o Minor features (fallback directory mirrors):
- - Update the fallback whitelist based on operator opt-ins and opt-
- outs. Closes ticket 24805, patch by Phoul.
- o Minor features (FreeBSD):
- - On FreeBSD-based systems, warn relay operators if the
- "net.inet.ip.random_id" sysctl (IP ID randomization) is disabled.
- Closes ticket 28518.
- o Minor features (geoip):
- - Update geoip and geoip6 to the April 2 2019 Maxmind GeoLite2
- Country database. Closes ticket 29992.
- o Minor features (HTTP standards compliance):
- - Stop sending the header "Content-type: application/octet-stream"
- along with transparently compressed documents: this confused
- browsers. Closes ticket 28100.
- o Minor features (IPv6):
- - We add an option ClientAutoIPv6ORPort, to make clients randomly
- prefer a node's IPv4 or IPv6 ORPort. The random preference is set
- every time a node is loaded from a new consensus or bridge config.
- We expect that this option will enable clients to bootstrap more
- quickly without having to determine whether they support IPv4,
- IPv6, or both. Closes ticket 27490. Patch by Neel Chauhan.
- - When using addrs_in_same_network_family(), avoid choosing circuit
- paths that pass through the same IPv6 subnet more than once.
- Previously, we only checked IPv4 subnets. Closes ticket 24393.
- Patch by Neel Chauhan.
- o Minor features (log messages):
- - Improve log message in v3 onion services that could print out
- negative revision counters. Closes ticket 27707. Patch
- by "ffmancera".
- o Minor features (memory usage):
- - Save memory by storing microdescriptor family lists with a more
- compact representation. Closes ticket 27359.
- - Tor clients now use mmap() to read consensus files from disk, so
- that they no longer need keep the full text of a consensus in
- memory when parsing it or applying a diff. Closes ticket 27244.
- o Minor features (NSS, diagnostic):
- - Try to log an error from NSS (if there is any) and a more useful
- description of our situation if we are using NSS and a call to
- SSL_ExportKeyingMaterial() fails. Diagnostic for ticket 29241.
- o Minor features (parsing):
- - Directory authorities now validate that router descriptors and
- ExtraInfo documents are in a valid subset of UTF-8, and reject
- them if they are not. Closes ticket 27367.
- o Minor features (performance):
- - Cache the results of summarize_protocol_flags(), so that we don't
- have to parse the same protocol-versions string over and over.
- This should save us a huge number of malloc calls on startup, and
- may reduce memory fragmentation with some allocators. Closes
- ticket 27225.
- - Remove a needless memset() call from get_token_arguments, thereby
- speeding up the tokenization of directory objects by about 20%.
- Closes ticket 28852.
- - Replace parse_short_policy() with a faster implementation, to
- improve microdescriptor parsing time. Closes ticket 28853.
- - Speed up directory parsing a little by avoiding use of the non-
- inlined strcmp_len() function. Closes ticket 28856.
- - Speed up microdescriptor parsing by about 30%, to help improve
- startup time. Closes ticket 28839.
- o Minor features (pluggable transports):
- - Add support for emitting STATUS updates to Tor's control port from
- a pluggable transport process. Closes ticket 28846.
- - Add support for logging to Tor's logging subsystem from a
- pluggable transport process. Closes ticket 28180.
- o Minor features (process management):
- - Add a new process API for handling child processes. This new API
- allows Tor to have bi-directional communication with child
- processes on both Unix and Windows. Closes ticket 28179.
- - Use the subsystem manager to initialize and shut down the process
- module. Closes ticket 28847.
- o Minor features (relay):
- - When listing relay families, list them in canonical form including
- the relay's own identity, and try to give a more useful set of
- warnings. Part of ticket 28266 and proposal 298.
- o Minor features (required protocols):
- - Before exiting because of a missing required protocol, Tor will
- now check the publication time of the consensus, and not exit
- unless the consensus is newer than the Tor program's own release
- date. Previously, Tor would not check the consensus publication
- time, and so might exit because of a missing protocol that might
- no longer be required in a current consensus. Implements proposal
- 297; closes ticket 27735.
- o Minor features (testing):
- - Treat all unexpected ERR and BUG messages as test failures. Closes
- ticket 28668.
- - Allow a HeartbeatPeriod of less than 30 minutes in testing Tor
- networks. Closes ticket 28840. Patch by Rob Jansen.
- - Use the approx_time() function when setting the "Expires" header
- in directory replies, to make them more testable. Needed for
- ticket 30001.
- o Minor bugfixes (security):
- - Fix a potential double free bug when reading huge bandwidth files.
- The issue is not exploitable in the current Tor network because
- the vulnerable code is only reached when directory authorities
- read bandwidth files, but bandwidth files come from a trusted
- source (usually the authorities themselves). Furthermore, the
- issue is only exploitable in rare (non-POSIX) 32-bit architectures,
- which are not used by any of the current authorities. Fixes bug
- 30040; bugfix on 0.3.5.1-alpha. Bug found and fixed by
- Tobias Stoeckmann.
- - Verify in more places that we are not about to create a buffer
- with more than INT_MAX bytes, to avoid possible OOB access in the
- event of bugs. Fixes bug 30041; bugfix on 0.2.0.16. Found and
- fixed by Tobias Stoeckmann.
- o Minor bugfix (continuous integration):
- - Reset coverage state on disk after Travis CI has finished. This
- should prevent future coverage merge errors from causing the test
- suite for the "process" subsystem to fail. The process subsystem
- was introduced in 0.4.0.1-alpha. Fixes bug 29036; bugfix
- on 0.2.9.15.
- - Terminate test-stem if it takes more than 9.5 minutes to run.
- (Travis terminates the job after 10 minutes of no output.)
- Diagnostic for 29437. Fixes bug 30011; bugfix on 0.3.5.4-alpha.
- o Minor bugfixes (build, compatibility, rust):
- - Update Cargo.lock file to match the version made by the latest
- version of Rust, so that "make distcheck" will pass again. Fixes
- bug 29244; bugfix on 0.3.3.4-alpha.
- o Minor bugfixes (C correctness):
- - Fix an unlikely memory leak in consensus_diff_apply(). Fixes bug
- 29824; bugfix on 0.3.1.1-alpha. This is Coverity warning
- CID 1444119.
- o Minor bugfixes (client, clock skew):
- - Bootstrap successfully even when Tor's clock is behind the clocks
- on the authorities. Fixes bug 28591; bugfix on 0.2.0.9-alpha.
- - Select guards even if the consensus has expired, as long as the
- consensus is still reasonably live. Fixes bug 24661; bugfix
- on 0.3.0.1-alpha.
- o Minor bugfixes (compilation):
- - Silence a compiler warning in test-memwipe.c on OpenBSD. Fixes bug
- 29145; bugfix on 0.2.9.3-alpha. Patch from Kris Katterjohn.
- - Compile correctly on OpenBSD; previously, we were missing some
- headers required in order to detect it properly. Fixes bug 28938;
- bugfix on 0.3.5.1-alpha. Patch from Kris Katterjohn.
- o Minor bugfixes (directory clients):
- - Mark outdated dirservers when Tor only has a reasonably live
- consensus. Fixes bug 28569; bugfix on 0.3.2.5-alpha.
- o Minor bugfixes (directory mirrors):
- - Even when a directory mirror's clock is behind the clocks on the
- authorities, we now allow the mirror to serve "future"
- consensuses. Fixes bug 28654; bugfix on 0.3.0.1-alpha.
- o Minor bugfixes (DNS):
- - Gracefully handle an empty or absent resolve.conf file by falling
- back to using "localhost" as a DNS server (and hoping it works).
- Previously, we would just stop running as an exit. Fixes bug
- 21900; bugfix on 0.2.1.10-alpha.
- o Minor bugfixes (documentation):
- - Describe the contents of the v3 onion service client authorization
- files correctly: They hold public keys, not private keys. Fixes
- bug 28979; bugfix on 0.3.5.1-alpha. Spotted by "Felixix".
- o Minor bugfixes (guards):
- - In count_acceptable_nodes(), the minimum number is now one bridge
- or guard node, and two non-guard nodes for a circuit. Previously,
- we had added up the sum of all nodes with a descriptor, but that
- could cause us to build failing circuits when we had either too
- many bridges or not enough guard nodes. Fixes bug 25885; bugfix on
- 0.2.3.1-alpha. Patch by Neel Chauhan.
- o Minor bugfixes (IPv6):
- - Fix tor_ersatz_socketpair on IPv6-only systems. Previously, the
- IPv6 socket was bound using an address family of AF_INET instead
- of AF_INET6. Fixes bug 28995; bugfix on 0.3.5.1-alpha. Patch from
- Kris Katterjohn.
- o Minor bugfixes (logging):
- - Correct a misleading error message when IPv4Only or IPv6Only is
- used but the resolved address can not be interpreted as an address
- of the specified IP version. Fixes bug 13221; bugfix on
- 0.2.3.9-alpha. Patch from Kris Katterjohn.
- - Log the correct port number for listening sockets when "auto" is
- used to let Tor pick the port number. Previously, port 0 was
- logged instead of the actual port number. Fixes bug 29144; bugfix
- on 0.3.5.1-alpha. Patch from Kris Katterjohn.
- - Stop logging a BUG() warning when Tor is waiting for exit
- descriptors. Fixes bug 28656; bugfix on 0.3.5.1-alpha.
- - Avoid logging that we are relaxing a circuit timeout when that
- timeout is fixed. Fixes bug 28698; bugfix on 0.2.4.7-alpha.
- - Log more information at "warning" level when unable to read a
- private key; log more information at "info" level when unable to
- read a public key. We had warnings here before, but they were lost
- during our NSS work. Fixes bug 29042; bugfix on 0.3.5.1-alpha.
- - Rework rep_hist_log_link_protocol_counts() to iterate through all
- link protocol versions when logging incoming/outgoing connection
- counts. Tor no longer skips version 5, and we won't have to
- remember to update this function when new link protocol version is
- developed. Fixes bug 28920; bugfix on 0.2.6.10.
- o Minor bugfixes (memory management):
- - Refactor the shared random state's memory management so that it
- actually takes ownership of the shared random value pointers.
- Fixes bug 29706; bugfix on 0.2.9.1-alpha.
- - Stop leaking parts of the shared random state in the shared-random
- unit tests. Fixes bug 29599; bugfix on 0.2.9.1-alpha.
- o Minor bugfixes (misc):
- - The amount of total available physical memory is now determined
- using the sysctl identifier HW_PHYSMEM (rather than HW_USERMEM)
- when it is defined and a 64-bit variant is not available. Fixes
- bug 28981; bugfix on 0.2.5.4-alpha. Patch from Kris Katterjohn.
- o Minor bugfixes (networking):
- - Introduce additional checks into tor_addr_parse() to reject
- certain incorrect inputs that previously were not detected. Fixes
- bug 23082; bugfix on 0.2.0.10-alpha.
- o Minor bugfixes (onion service v3, client):
- - Stop logging a "BUG()" warning and stacktrace when we find a SOCKS
- connection waiting for a descriptor that we actually have in the
- cache. It turns out that this can actually happen, though it is
- rare. Now, tor will recover and retry the descriptor. Fixes bug
- 28669; bugfix on 0.3.2.4-alpha.
- o Minor bugfixes (onion services):
- - Avoid crashing if ClientOnionAuthDir (incorrectly) contains more
- than one private key for a hidden service. Fixes bug 29040; bugfix
- on 0.3.5.1-alpha.
- - In hs_cache_store_as_client() log an HSDesc we failed to parse at
- "debug" level. Tor used to log it as a warning, which caused very
- long log lines to appear for some users. Fixes bug 29135; bugfix
- on 0.3.2.1-alpha.
- - Stop logging "Tried to establish rendezvous on non-OR circuit..."
- as a warning. Instead, log it as a protocol warning, because there
- is nothing that relay operators can do to fix it. Fixes bug 29029;
- bugfix on 0.2.5.7-rc.
- o Minor bugfixes (periodic events):
- - Refrain from calling routerlist_remove_old_routers() from
- check_descriptor_callback(). Instead, create a new hourly periodic
- event. Fixes bug 27929; bugfix on 0.2.8.1-alpha.
- o Minor bugfixes (pluggable transports):
- - Make sure that data is continously read from standard output and
- standard error pipes of a pluggable transport child-process, to
- avoid deadlocking when a pipe's buffer is full. Fixes bug 26360;
- bugfix on 0.2.3.6-alpha.
- o Minor bugfixes (rust):
- - Abort on panic in all build profiles, instead of potentially
- unwinding into C code. Fixes bug 27199; bugfix on 0.3.3.1-alpha.
- o Minor bugfixes (scheduler):
- - When re-adding channels to the pending list, check the correct
- channel's sched_heap_idx. This issue has had no effect in mainline
- Tor, but could have led to bugs down the road in improved versions
- of our circuit scheduling code. Fixes bug 29508; bugfix
- on 0.3.2.10.
- o Minor bugfixes (single onion services):
- - Allow connections to single onion services to remain idle without
- being disconnected. Previously, relays acting as rendezvous points
- for single onion services were mistakenly closing idle rendezvous
- circuits after 60 seconds, thinking that they were unused
- directory-fetching circuits that had served their purpose. Fixes
- bug 29665; bugfix on 0.2.1.26.
- o Minor bugfixes (stats):
- - When ExtraInfoStatistics is 0, stop including PaddingStatistics in
- relay and bridge extra-info documents. Fixes bug 29017; bugfix
- on 0.3.1.1-alpha.
- o Minor bugfixes (testing):
- - Backport the 0.3.4 src/test/test-network.sh to 0.2.9. We need a
- recent test-network.sh to use new chutney features in CI. Fixes
- bug 29703; bugfix on 0.2.9.1-alpha.
- - Fix a test failure on Windows caused by an unexpected "BUG"
- warning in our tests for tor_gmtime_r(-1). Fixes bug 29922; bugfix
- on 0.2.9.3-alpha.
- - Downgrade some LOG_ERR messages in the address/* tests to
- warnings. The LOG_ERR messages were occurring when we had no
- configured network. We were failing the unit tests, because we
- backported 28668 to 0.3.5.8, but did not backport 29530. Fixes bug
- 29530; bugfix on 0.3.5.8.
- - Fix our gcov wrapper script to look for object files at the
- correct locations. Fixes bug 29435; bugfix on 0.3.5.1-alpha.
- - Detect and suppress "bug" warnings from the util/time test on
- Windows. Fixes bug 29161; bugfix on 0.2.9.3-alpha.
- - Do not log an error-level message if we fail to find an IPv6
- network interface from the unit tests. Fixes bug 29160; bugfix
- on 0.2.7.3-rc.
- - Instead of relying on hs_free_all() to clean up all onion service
- objects in test_build_descriptors(), we now deallocate them one by
- one. This lets Coverity know that we are not leaking memory there
- and fixes CID 1442277. Fixes bug 28989; bugfix on 0.3.5.1-alpha.
- o Minor bugfixes (TLS protocol):
- - When classifying a client's selection of TLS ciphers, if the
- client ciphers are not yet available, do not cache the result.
- Previously, we had cached the unavailability of the cipher list
- and never looked again, which in turn led us to assume that the
- client only supported the ancient V1 link protocol. This, in turn,
- was causing Stem integration tests to stall in some cases. Fixes
- bug 30021; bugfix on 0.2.4.8-alpha.
- o Minor bugfixes (usability):
- - Stop saying "Your Guard ..." in pathbias_measure_{use,close}_rate().
- Some users took this phrasing to mean that the mentioned guard was
- under their control or responsibility, which it is not. Fixes bug
- 28895; bugfix on Tor 0.3.0.1-alpha.
- o Minor bugfixes (Windows, CI):
- - Skip the Appveyor 32-bit Windows Server 2016 job, and 64-bit
- Windows Server 2012 R2 job. The remaining 2 jobs still provide
- coverage of 64/32-bit, and Windows Server 2016/2012 R2. Also set
- fast_finish, so failed jobs terminate the build immediately. Fixes
- bug 29601; bugfix on 0.3.5.4-alpha.
- o Code simplification and refactoring:
- - Introduce a connection_dir_buf_add() helper function that detects
- whether compression is in use, and adds a string accordingly.
- Resolves issue 28816.
- - Refactor handle_get_next_bandwidth() to use
- connection_dir_buf_add(). Implements ticket 29897.
- - Reimplement NETINFO cell parsing and generation to rely on
- trunnel-generated wire format handling code. Closes ticket 27325.
- - Remove unnecessary unsafe code from the Rust macro "cstr!". Closes
- ticket 28077.
- - Rework SOCKS wire format handling to rely on trunnel-generated
- parsing/generation code. Resolves ticket 27620.
- - Split out bootstrap progress reporting from control.c into a
- separate file. Part of ticket 27402.
- - The .may_include files that we use to describe our directory-by-
- directory dependency structure now describe a noncircular
- dependency graph over the directories that they cover. Our
- checkIncludes.py tool now enforces this noncircularity. Closes
- ticket 28362.
- o Documentation:
- - Clarify that Tor performs stream isolation among *Port listeners
- by default. Resolves issue 29121.
- - In the manpage entry describing MapAddress torrc setting, use
- example IP addresses from ranges specified for use in documentation
- by RFC 5737. Resolves issue 28623.
- - Mention that you cannot add a new onion service if Tor is already
- running with Sandbox enabled. Closes ticket 28560.
- - Improve ControlPort documentation. Mention that it accepts
- address:port pairs, and can be used multiple times. Closes
- ticket 28805.
- - Document the exact output of "tor --version". Closes ticket 28889.
- o Removed features:
- - Remove the old check-tor script. Resolves issue 29072.
- - Stop responding to the 'GETINFO status/version/num-concurring' and
- 'GETINFO status/version/num-versioning' control port commands, as
- those were deprecated back in 0.2.0.30. Also stop listing them in
- output of 'GETINFO info/names'. Resolves ticket 28757.
- - The scripts used to generate and maintain the list of fallback
- directories have been extracted into a new "fallback-scripts"
- repository. Closes ticket 27914.
- o Testing:
- - Run shellcheck for scripts in the in scripts/ directory. Closes
- ticket 28058.
- - Add unit tests for tokenize_string() and get_next_token()
- functions. Resolves ticket 27625.
- o Code simplification and refactoring (onion service v3):
- - Consolidate the authorized client descriptor cookie computation
- code from client and service into one function. Closes
- ticket 27549.
- o Code simplification and refactoring (shell scripts):
- - Cleanup scan-build.sh to silence shellcheck warnings. Closes
- ticket 28007.
- - Fix issues that shellcheck found in chutney-git-bisect.sh.
- Resolves ticket 28006.
- - Fix issues that shellcheck found in updateRustDependencies.sh.
- Resolves ticket 28012.
- - Fix shellcheck warnings in cov-diff script. Resolves issue 28009.
- - Fix shellcheck warnings in run_calltool.sh. Resolves ticket 28011.
- - Fix shellcheck warnings in run_trunnel.sh. Resolves issue 28010.
- - Fix shellcheck warnings in scripts/test/coverage. Resolves
- issue 28008.
- Changes in version 0.3.5.8 - 2019-02-21
- Tor 0.3.5.8 backports several fixes from later releases, including fixes
- for an annoying SOCKS-parsing bug that affected users in earlier 0.3.5.x
- releases.
- It also includes a fix for a medium-severity security bug affecting Tor
- 0.3.2.1-alpha and later. All Tor instances running an affected release
- should upgrade to 0.3.3.12, 0.3.4.11, 0.3.5.8, or 0.4.0.2-alpha.
- o Major bugfixes (cell scheduler, KIST, security):
- - Make KIST consider the outbuf length when computing what it can
- put in the outbuf. Previously, KIST acted as though the outbuf
- were empty, which could lead to the outbuf becoming too full. It
- is possible that an attacker could exploit this bug to cause a Tor
- client or relay to run out of memory and crash. Fixes bug 29168;
- bugfix on 0.3.2.1-alpha. This issue is also being tracked as
- TROVE-2019-001 and CVE-2019-8955.
- o Major bugfixes (networking, backport from 0.4.0.2-alpha):
- - Gracefully handle empty username/password fields in SOCKS5
- username/password auth messsage and allow SOCKS5 handshake to
- continue. Previously, we had rejected these handshakes, breaking
- certain applications. Fixes bug 29175; bugfix on 0.3.5.1-alpha.
- o Minor features (compilation, backport from 0.4.0.2-alpha):
- - Compile correctly when OpenSSL is built with engine support
- disabled, or with deprecated APIs disabled. Closes ticket 29026.
- Patches from "Mangix".
- o Minor features (geoip):
- - Update geoip and geoip6 to the February 5 2019 Maxmind GeoLite2
- Country database. Closes ticket 29478.
- o Minor features (testing, backport from 0.4.0.2-alpha):
- - Treat all unexpected ERR and BUG messages as test failures. Closes
- ticket 28668.
- o Minor bugfixes (onion service v3, client, backport from 0.4.0.1-alpha):
- - Stop logging a "BUG()" warning and stacktrace when we find a SOCKS
- connection waiting for a descriptor that we actually have in the
- cache. It turns out that this can actually happen, though it is
- rare. Now, tor will recover and retry the descriptor. Fixes bug
- 28669; bugfix on 0.3.2.4-alpha.
- o Minor bugfixes (IPv6, backport from 0.4.0.1-alpha):
- - Fix tor_ersatz_socketpair on IPv6-only systems. Previously, the
- IPv6 socket was bound using an address family of AF_INET instead
- of AF_INET6. Fixes bug 28995; bugfix on 0.3.5.1-alpha. Patch from
- Kris Katterjohn.
- o Minor bugfixes (build, compatibility, rust, backport from 0.4.0.2-alpha):
- - Update Cargo.lock file to match the version made by the latest
- version of Rust, so that "make distcheck" will pass again. Fixes
- bug 29244; bugfix on 0.3.3.4-alpha.
- o Minor bugfixes (client, clock skew, backport from 0.4.0.1-alpha):
- - Select guards even if the consensus has expired, as long as the
- consensus is still reasonably live. Fixes bug 24661; bugfix
- on 0.3.0.1-alpha.
- o Minor bugfixes (compilation, backport from 0.4.0.1-alpha):
- - Compile correctly on OpenBSD; previously, we were missing some
- headers required in order to detect it properly. Fixes bug 28938;
- bugfix on 0.3.5.1-alpha. Patch from Kris Katterjohn.
- o Minor bugfixes (documentation, backport from 0.4.0.2-alpha):
- - Describe the contents of the v3 onion service client authorization
- files correctly: They hold public keys, not private keys. Fixes
- bug 28979; bugfix on 0.3.5.1-alpha. Spotted by "Felixix".
- o Minor bugfixes (logging, backport from 0.4.0.1-alpha):
- - Rework rep_hist_log_link_protocol_counts() to iterate through all
- link protocol versions when logging incoming/outgoing connection
- counts. Tor no longer skips version 5, and we won't have to
- remember to update this function when new link protocol version is
- developed. Fixes bug 28920; bugfix on 0.2.6.10.
- o Minor bugfixes (logging, backport from 0.4.0.2-alpha):
- - Log more information at "warning" level when unable to read a
- private key; log more information at "info" level when unable to
- read a public key. We had warnings here before, but they were lost
- during our NSS work. Fixes bug 29042; bugfix on 0.3.5.1-alpha.
- o Minor bugfixes (misc, backport from 0.4.0.2-alpha):
- - The amount of total available physical memory is now determined
- using the sysctl identifier HW_PHYSMEM (rather than HW_USERMEM)
- when it is defined and a 64-bit variant is not available. Fixes
- bug 28981; bugfix on 0.2.5.4-alpha. Patch from Kris Katterjohn.
- o Minor bugfixes (onion services, backport from 0.4.0.2-alpha):
- - Avoid crashing if ClientOnionAuthDir (incorrectly) contains more
- than one private key for a hidden service. Fixes bug 29040; bugfix
- on 0.3.5.1-alpha.
- - In hs_cache_store_as_client() log an HSDesc we failed to parse at
- "debug" level. Tor used to log it as a warning, which caused very
- long log lines to appear for some users. Fixes bug 29135; bugfix
- on 0.3.2.1-alpha.
- - Stop logging "Tried to establish rendezvous on non-OR circuit..."
- as a warning. Instead, log it as a protocol warning, because there
- is nothing that relay operators can do to fix it. Fixes bug 29029;
- bugfix on 0.2.5.7-rc.
- o Minor bugfixes (tests, directory clients, backport from 0.4.0.1-alpha):
- - Mark outdated dirservers when Tor only has a reasonably live
- consensus. Fixes bug 28569; bugfix on 0.3.2.5-alpha.
- o Minor bugfixes (tests, backport from 0.4.0.2-alpha):
- - Detect and suppress "bug" warnings from the util/time test on
- Windows. Fixes bug 29161; bugfix on 0.2.9.3-alpha.
- - Do not log an error-level message if we fail to find an IPv6
- network interface from the unit tests. Fixes bug 29160; bugfix
- on 0.2.7.3-rc.
- o Minor bugfixes (usability, backport from 0.4.0.1-alpha):
- - Stop saying "Your Guard ..." in pathbias_measure_{use,close}_rate().
- Some users took this phrasing to mean that the mentioned guard was
- under their control or responsibility, which it is not. Fixes bug
- 28895; bugfix on Tor 0.3.0.1-alpha.
- Changes in version 0.3.4.11 - 2019-02-21
- Tor 0.3.4.11 is the third stable release in its series. It includes
- a fix for a medium-severity security bug affecting Tor 0.3.2.1-alpha and
- later. All Tor instances running an affected release should upgrade to
- 0.3.3.12, 0.3.4.11, 0.3.5.8, or 0.4.0.2-alpha.
- o Major bugfixes (cell scheduler, KIST, security):
- - Make KIST consider the outbuf length when computing what it can
- put in the outbuf. Previously, KIST acted as though the outbuf
- were empty, which could lead to the outbuf becoming too full. It
- is possible that an attacker could exploit this bug to cause a Tor
- client or relay to run out of memory and crash. Fixes bug 29168;
- bugfix on 0.3.2.1-alpha. This issue is also being tracked as
- TROVE-2019-001 and CVE-2019-8955.
- o Minor features (geoip):
- - Update geoip and geoip6 to the February 5 2019 Maxmind GeoLite2
- Country database. Closes ticket 29478.
- o Minor bugfixes (build, compatibility, rust, backport from 0.4.0.2-alpha):
- - Update Cargo.lock file to match the version made by the latest
- version of Rust, so that "make distcheck" will pass again. Fixes
- bug 29244; bugfix on 0.3.3.4-alpha.
- o Minor bugfixes (onion services, backport from 0.4.0.2-alpha):
- - Stop logging "Tried to establish rendezvous on non-OR circuit..."
- as a warning. Instead, log it as a protocol warning, because there
- is nothing that relay operators can do to fix it. Fixes bug 29029;
- bugfix on 0.2.5.7-rc.
- Changes in version 0.3.3.12 - 2019-02-21
- Tor 0.3.3.12 fixes a medium-severity security bug affecting Tor
- 0.3.2.1-alpha and later. All Tor instances running an affected release
- should upgrade to 0.3.3.12, 0.3.4.11, 0.3.5.8, or 0.4.0.2-alpha.
- This release marks the end of support for the Tor 0.3.3.x series. We
- recommend that users switch to either the Tor 0.3.4 series (supported
- until at least 10 June 2019), or the Tor 0.3.5 series, which will
- receive long-term support until at least 1 Feb 2022.
- o Major bugfixes (cell scheduler, KIST, security):
- - Make KIST consider the outbuf length when computing what it can
- put in the outbuf. Previously, KIST acted as though the outbuf
- were empty, which could lead to the outbuf becoming too full. It
- is possible that an attacker could exploit this bug to cause a Tor
- client or relay to run out of memory and crash. Fixes bug 29168;
- bugfix on 0.3.2.1-alpha. This issue is also being tracked as
- TROVE-2019-001 and CVE-2019-8955.
- o Minor features (geoip):
- - Update geoip and geoip6 to the February 5 2019 Maxmind GeoLite2
- Country database. Closes ticket 29478.
- o Minor bugfixes (build, compatibility, rust, backport from 0.4.0.2-alpha):
- - Update Cargo.lock file to match the version made by the latest
- version of Rust, so that "make distcheck" will pass again. Fixes
- bug 29244; bugfix on 0.3.3.4-alpha.
- o Minor bugfixes (onion services, backport from 0.4.0.2-alpha):
- - Stop logging "Tried to establish rendezvous on non-OR circuit..."
- as a warning. Instead, log it as a protocol warning, because there
- is nothing that relay operators can do to fix it. Fixes bug 29029;
- bugfix on 0.2.5.7-rc.
- Changes in version 0.3.3.11 - 2019-01-07
- Tor 0.3.3.11 backports numerous fixes from later versions of Tor.
- numerous fixes, including an important fix for anyone using OpenSSL
- 1.1.1. Anyone running an earlier version of Tor 0.3.3 should upgrade
- to this version, or to a later series.
- As a reminder, support the Tor 0.3.3 series will end on 22 Feb 2019.
- We anticipate that this will be the last release of Tor 0.3.3, unless
- some major bug is before then. Some time between now and then, users
- should switch to either the Tor 0.3.4 series (supported until at least
- 10 June 2019), or the Tor 0.3.5 series, which will receive long-term
- support until at least 1 Feb 2022.
- o Major bugfixes (OpenSSL, portability, backport from 0.3.5.5-alpha):
- - Fix our usage of named groups when running as a TLS 1.3 client in
- OpenSSL 1.1.1. Previously, we only initialized EC groups when
- running as a relay, which caused clients to fail to negotiate TLS
- 1.3 with relays. Fixes bug 28245; bugfix on 0.2.9.15 (when TLS 1.3
- support was added).
- o Major bugfixes (restart-in-process, backport from 0.3.5.1-alpha):
- - Fix a use-after-free error that could be caused by passing Tor an
- impossible set of options that would fail during options_act().
- Fixes bug 27708; bugfix on 0.3.3.1-alpha.
- o Minor features (continuous integration, backport from 0.3.5.1-alpha):
- - Only run one online rust build in Travis, to reduce network
- errors. Skip offline rust builds on Travis for Linux gcc, because
- they're redundant. Implements ticket 27252.
- - Skip gcc on OSX in Travis CI, because it's rarely used. Skip a
- duplicate hardening-off build in Travis on Tor 0.2.9. Skip gcc on
- Linux with default settings, because all the non-default builds
- use gcc on Linux. Implements ticket 27252.
- o Minor features (continuous integration, backport from 0.3.5.3-alpha):
- - Use the Travis Homebrew addon to install packages on macOS during
- Travis CI. The package list is the same, but the Homebrew addon
- does not do a `brew update` by default. Implements ticket 27738.
- o Minor features (fallback directory list, backport from 0.3.5.6-rc):
- - Replace the 150 fallbacks originally introduced in Tor
- 0.3.3.1-alpha in January 2018 (of which ~115 were still
- functional), with a list of 157 fallbacks (92 new, 65 existing, 85
- removed) generated in December 2018. Closes ticket 24803.
- o Minor features (geoip):
- - Update geoip and geoip6 to the January 3 2019 Maxmind GeoLite2
- Country database. Closes ticket 29012.
- o Minor features (OpenSSL bug workaround, backport from 0.3.5.7):
- - Work around a bug in OpenSSL 1.1.1a, which prevented the TLS 1.3
- key export function from handling long labels. When this bug is
- detected, Tor will disable TLS 1.3. We recommend upgrading to a
- version of OpenSSL without this bug when it becomes available.
- Closes ticket 28973.
- o Minor bugfixes (relay statistics, backport from 0.3.5.7):
- - Update relay descriptor on bandwidth changes only when the uptime
- is smaller than 24h, in order to reduce the efficiency of guard
- discovery attacks. Fixes bug 24104; bugfix on 0.1.1.6-alpha.
- o Minor bugfixes (C correctness, backport from 0.3.5.4-alpha):
- - Avoid undefined behavior in an end-of-string check when parsing
- the BEGIN line in a directory object. Fixes bug 28202; bugfix
- on 0.2.0.3-alpha.
- o Minor bugfixes (code safety, backport from 0.3.5.3-alpha):
- - Rewrite our assertion macros so that they no longer suppress the
- compiler's -Wparentheses warnings. Fixes bug 27709; bugfix
- o Minor bugfixes (compilation, backport from 0.3.5.5-alpha):
- - Initialize a variable unconditionally in aes_new_cipher(), since
- some compilers cannot tell that we always initialize it before
- use. Fixes bug 28413; bugfix on 0.2.9.3-alpha.
- o Minor bugfixes (directory authority, backport from 0.3.5.4-alpha):
- - Log additional info when we get a relay that shares an ed25519 ID
- with a different relay, instead making a BUG() warning. Fixes bug
- 27800; bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (directory permissions, backport form 0.3.5.3-alpha):
- - When a user requests a group-readable DataDirectory, give it to
- them. Previously, when the DataDirectory and the CacheDirectory
- were the same, the default setting (0) for
- CacheDirectoryGroupReadable would override the setting for
- DataDirectoryGroupReadable. Fixes bug 26913; bugfix
- on 0.3.3.1-alpha.
- o Minor bugfixes (onion service v3, backport from 0.3.5.1-alpha):
- - When the onion service directory can't be created or has the wrong
- permissions, do not log a stack trace. Fixes bug 27335; bugfix
- on 0.3.2.1-alpha.
- o Minor bugfixes (onion service v3, backport from 0.3.5.2-alpha):
- - Close all SOCKS request (for the same .onion) if the newly fetched
- descriptor is unusable. Before that, we would close only the first
- one leaving the other hanging and let to time out by themselves.
- Fixes bug 27410; bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (onion service v3, backport from 0.3.5.3-alpha):
- - Don't warn so loudly when Tor is unable to decode an onion
- descriptor. This can now happen as a normal use case if a client
- gets a descriptor with client authorization but the client is not
- authorized. Fixes bug 27550; bugfix on 0.3.5.1-alpha.
- o Minor bugfixes (onion service v3, backport from 0.3.5.6-rc):
- - When deleting an ephemeral onion service (DEL_ONION), do not close
- any rendezvous circuits in order to let the existing client
- connections finish by themselves or closed by the application. The
- HS v2 is doing that already so now we have the same behavior for
- all versions. Fixes bug 28619; bugfix on 0.3.3.1-alpha.
- o Minor bugfixes (HTTP tunnel):
- - Fix a bug warning when closing an HTTP tunnel connection due to
- an HTTP request we couldn't handle. Fixes bug 26470; bugfix on
- 0.3.2.1-alpha.
- o Minor bugfixes (memory leaks, backport from 0.3.5.5-alpha):
- - Fix a harmless memory leak in libtorrunner.a. Fixes bug 28419;
- bugfix on 0.3.3.1-alpha. Patch from Martin Kepplinger.
- o Minor bugfixes (netflow padding, backport from 0.3.5.1-alpha):
- - Ensure circuitmux queues are empty before scheduling or sending
- padding. Fixes bug 25505; bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (protover, backport from 0.3.5.3-alpha):
- - Reject protocol names containing bytes other than alphanumeric
- characters and hyphens ([A-Za-z0-9-]). Fixes bug 27316; bugfix
- on 0.2.9.4-alpha.
- o Minor bugfixes (rust, backport from 0.3.5.1-alpha):
- - Compute protover votes correctly in the rust version of the
- protover code. Previously, the protover rewrite in 24031 allowed
- repeated votes from the same voter for the same protocol version
- to be counted multiple times in protover_compute_vote(). Fixes bug
- 27649; bugfix on 0.3.3.5-rc.
- - Reject protover names that contain invalid characters. Fixes bug
- 27687; bugfix on 0.3.3.1-alpha.
- o Minor bugfixes (rust, backport from 0.3.5.2-alpha):
- - protover_all_supported() would attempt to allocate up to 16GB on
- some inputs, leading to a potential memory DoS. Fixes bug 27206;
- bugfix on 0.3.3.5-rc.
- o Minor bugfixes (rust, backport from 0.3.5.4-alpha):
- - Fix a potential null dereference in protover_all_supported(). Add
- a test for it. Fixes bug 27804; bugfix on 0.3.3.1-alpha.
- - Return a string that can be safely freed by C code, not one
- created by the rust allocator, in protover_all_supported(). Fixes
- bug 27740; bugfix on 0.3.3.1-alpha.
- - Fix an API mismatch in the rust implementation of
- protover_compute_vote(). This bug could have caused crashes on any
- directory authorities running Tor with Rust (which we do not yet
- recommend). Fixes bug 27741; bugfix on 0.3.3.6.
- o Minor bugfixes (testing, backport from 0.3.5.1-alpha):
- - If a unit test running in a subprocess exits abnormally or with a
- nonzero status code, treat the test as having failed, even if the
- test reported success. Without this fix, memory leaks don't cause
- the tests to fail, even with LeakSanitizer. Fixes bug 27658;
- bugfix on 0.2.2.4-alpha.
- o Minor bugfixes (testing, backport from 0.3.5.4-alpha):
- - Treat backtrace test failures as expected on BSD-derived systems
- (NetBSD, OpenBSD, and macOS/Darwin) until we solve bug 17808.
- (FreeBSD failures have been treated as expected since 18204 in
- 0.2.8.) Fixes bug 27948; bugfix on 0.2.5.2-alpha.
- o Minor bugfixes (unit tests, guard selection, backport from 0.3.5.6-rc):
- - Stop leaking memory in an entry guard unit test. Fixes bug 28554;
- bugfix on 0.3.0.1-alpha.
- Changes in version 0.3.4.10 - 2019-01-07
- Tor 0.3.4.9 is the second stable release in its series; it backports
- numerous fixes, including an important fix for relays, and for anyone
- using OpenSSL 1.1.1. Anyone running an earlier version of Tor 0.3.4
- should upgrade.
- As a reminder, the Tor 0.3.4 series will be supported until 10 June
- 2019. Some time between now and then, users should switch to the Tor
- 0.3.5 series, which will receive long-term support until at least 1
- Feb 2022.
- o Major bugfixes (OpenSSL, portability, backport from 0.3.5.5-alpha):
- - Fix our usage of named groups when running as a TLS 1.3 client in
- OpenSSL 1.1.1. Previously, we only initialized EC groups when
- running as a relay, which caused clients to fail to negotiate TLS
- 1.3 with relays. Fixes bug 28245; bugfix on 0.2.9.15 (when TLS 1.3
- support was added).
- o Major bugfixes (relay, directory, backport from 0.3.5.7):
- - Always reactivate linked connections in the main loop so long as
- any linked connection has been active. Previously, connections
- serving directory information wouldn't get reactivated after the
- first chunk of data was sent (usually 32KB), which would prevent
- clients from bootstrapping. Fixes bug 28912; bugfix on
- 0.3.4.1-alpha. Patch by "cypherpunks3".
- o Minor features (continuous integration, Windows, backport from 0.3.5.6-rc):
- - Always show the configure and test logs, and upload them as build
- artifacts, when building for Windows using Appveyor CI.
- Implements 28459.
- o Minor features (controller, backport from 0.3.5.1-alpha):
- - For purposes of CIRC_BW-based dropped cell detection, track half-
- closed stream ids, and allow their ENDs, SENDMEs, DATA and path
- bias check cells to arrive without counting it as dropped until
- either the END arrives, or the windows are empty. Closes
- ticket 25573.
- o Minor features (fallback directory list, backport from 0.3.5.6-rc):
- - Replace the 150 fallbacks originally introduced in Tor
- 0.3.3.1-alpha in January 2018 (of which ~115 were still
- functional), with a list of 157 fallbacks (92 new, 65 existing, 85
- removed) generated in December 2018. Closes ticket 24803.
- o Minor features (geoip):
- - Update geoip and geoip6 to the November 6 2018 Maxmind GeoLite2
- Country database. Closes ticket 28395.
- o Minor features (OpenSSL bug workaround, backport from 0.3.5.7):
- - Work around a bug in OpenSSL 1.1.1a, which prevented the TLS 1.3
- key export function from handling long labels. When this bug is
- detected, Tor will disable TLS 1.3. We recommend upgrading to a
- version of OpenSSL without this bug when it becomes available.
- Closes ticket 28973.
- o Minor bugfixes (compilation, backport from 0.3.5.5-alpha):
- - Initialize a variable unconditionally in aes_new_cipher(), since
- some compilers cannot tell that we always initialize it before
- use. Fixes bug 28413; bugfix on 0.2.9.3-alpha.
- o Minor bugfixes (connection, relay, backport from 0.3.5.5-alpha):
- - Avoid a logging a BUG() stacktrace when closing connection held
- open because the write side is rate limited but not the read side.
- Now, the connection read side is simply shut down until Tor is
- able to flush the connection and close it. Fixes bug 27750; bugfix
- on 0.3.4.1-alpha.
- o Minor bugfixes (continuous integration, Windows, backport from 0.3.5.5-alpha):
- - Manually configure the zstd compiler options, when building using
- mingw on Appveyor Windows CI. The MSYS2 mingw zstd package does
- not come with a pkg-config file. Fixes bug 28454; bugfix
- on 0.3.4.1-alpha.
- - Stop using an external OpenSSL install, and stop installing MSYS2
- packages, when building using mingw on Appveyor Windows CI. Fixes
- bug 28399; bugfix on 0.3.4.1-alpha.
- o Minor bugfixes (continuous integration, Windows, backport from 0.3.5.6-rc):
- - Explicitly specify the path to the OpenSSL library and do not
- download OpenSSL from Pacman, but instead use the library that is
- already provided by AppVeyor. Fixes bug 28574; bugfix on master.
- o Minor bugfixes (directory permissions, backport form 0.3.5.3-alpha):
- - When a user requests a group-readable DataDirectory, give it to
- them. Previously, when the DataDirectory and the CacheDirectory
- were the same, the default setting (0) for
- CacheDirectoryGroupReadable would override the setting for
- DataDirectoryGroupReadable. Fixes bug 26913; bugfix
- on 0.3.3.1-alpha.
- o Minor bugfixes (memory leaks, backport from 0.3.5.5-alpha):
- - Fix a harmless memory leak in libtorrunner.a. Fixes bug 28419;
- bugfix on 0.3.3.1-alpha. Patch from Martin Kepplinger.
- o Minor bugfixes (onion service v3, backport from 0.3.5.3-alpha):
- - Don't warn so loudly when Tor is unable to decode an onion
- descriptor. This can now happen as a normal use case if a client
- gets a descriptor with client authorization but the client is not
- authorized. Fixes bug 27550; bugfix on 0.3.5.1-alpha.
- o Minor bugfixes (onion service v3, backport from 0.3.5.6-rc):
- - When deleting an ephemeral onion service (DEL_ONION), do not close
- any rendezvous circuits in order to let the existing client
- connections finish by themselves or closed by the application. The
- HS v2 is doing that already so now we have the same behavior for
- all versions. Fixes bug 28619; bugfix on 0.3.3.1-alpha.
- o Minor bugfixes (relay statistics, backport from 0.3.5.7):
- - Update relay descriptor on bandwidth changes only when the uptime
- is smaller than 24h, in order to reduce the efficiency of guard
- discovery attacks. Fixes bug 24104; bugfix on 0.1.1.6-alpha.
- o Minor bugfixes (unit tests, guard selection, backport from 0.3.5.6-rc):
- - Stop leaking memory in an entry guard unit test. Fixes bug 28554;
- bugfix on 0.3.0.1-alpha.
- Changes in version 0.3.5.7 - 2019-01-07
- Tor 0.3.5.7 is the first stable release in its series; it includes
- compilation and portability fixes, and a fix for a severe problem
- affecting directory caches.
- The Tor 0.3.5 series includes several new features and performance
- improvements, including client authorization for v3 onion services,
- cleanups to bootstrap reporting, support for improved bandwidth-
- measurement tools, experimental support for NSS in place of OpenSSL,
- and much more. It also begins a full reorganization of Tor's code
- layout, for improved modularity and maintainability in the future.
- Finally, there is the usual set of performance improvements and
- bugfixes that we try to do in every release series.
- There are a couple of changes in the 0.3.5 that may affect
- compatibility. First, the default version for newly created onion
- services is now v3. Use the HiddenServiceVersion option if you want to
- override this. Second, some log messages related to bootstrapping have
- changed; if you use stem, you may need to update to the latest version
- so it will recognize them.
- We have designated 0.3.5 as a "long-term support" (LTS) series: we
- will continue to patch major bugs in typical configurations of 0.3.5
- until at least 1 Feb 2022. (We do not plan to provide long-term
- support for embedding, Rust support, NSS support, running a directory
- authority, or unsupported platforms. For these, you will need to stick
- with the latest stable release.)
- Below are the changes since 0.3.4.9. For a complete list of changes
- since 0.3.5.6-rc, see the ChangeLog file.
- o Major features (bootstrap):
- - Don't report directory progress until after a connection to a
- relay or bridge has succeeded. Previously, we'd report 80%
- progress based on cached directory information when we couldn't
- even connect to the network. Closes ticket 27169.
- o Major features (new code layout):
- - Nearly all of Tor's source code has been moved around into more
- logical places. The "common" directory is now divided into a set
- of libraries in "lib", and files in the "or" directory have been
- split into "core" (logic absolutely needed for onion routing),
- "feature" (independent modules in Tor), and "app" (to configure
- and invoke the rest of Tor). See doc/HACKING/CodeStructure.md for
- more information. Closes ticket 26481.
- This refactoring is not complete: although the libraries have been
- refactored to be acyclic, the main body of Tor is still too
- interconnected. We will attempt to improve this in the future.
- o Major features (onion services v3):
- - Implement onion service client authorization at the descriptor
- level: only authorized clients can decrypt a service's descriptor
- to find out how to contact it. A new torrc option was added to
- control this client side: ClientOnionAuthDir <path>. On the
- service side, if the "authorized_clients/" directory exists in the
- onion service directory path, client configurations are read from
- the files within. See the manpage for more details. Closes ticket
- 27547. Patch done by Suphanat Chunhapanya (haxxpop).
- - Improve revision counter generation in next-gen onion services.
- Onion services can now scale by hosting multiple instances on
- different hosts without synchronization between them, which was
- previously impossible because descriptors would get rejected by
- HSDirs. Addresses ticket 25552.
- - Version 3 onion services can now use the per-service
- HiddenServiceExportCircuitID option to differentiate client
- circuits. It communicates with the service by using the HAProxy
- protocol to assign virtual IP addresses to inbound client
- circuits. Closes ticket 4700. Patch by Mahrud Sayrafi.
- o Major features (onion services, UI change):
- - For a newly created onion service, the default version is now 3.
- Tor still supports existing version 2 services, but the operator
- now needs to set "HiddenServiceVersion 2" in order to create a new
- version 2 service. For existing services, Tor now learns the
- version by reading the key file. Closes ticket 27215.
- o Major features (portability, cryptography, experimental, TLS):
- - Tor now has the option to compile with the NSS library instead of
- OpenSSL. This feature is experimental, and we expect that bugs may
- remain. It is mainly intended for environments where Tor's
- performance is not CPU-bound, and where NSS is already known to be
- installed. To try it out, configure Tor with the --enable-nss
- flag. Closes tickets 26631, 26815, and 26816.
- If you are experimenting with this option and using an old cached
- consensus, Tor may fail to start. To solve this, delete your
- "cached-consensus" and "cached-microdesc-consensus" files,
- (if present), and restart Tor.
- o Major features (relay, UI change):
- - Relays no longer run as exits by default. If the "ExitRelay"
- option is auto (or unset), and no exit policy is specified with
- ExitPolicy or ReducedExitPolicy, we now treat ExitRelay as 0.
- Previously in this case, we allowed exit traffic and logged a
- warning message. Closes ticket 21530. Patch by Neel Chauhan.
- - Tor now validates that the ContactInfo config option is valid UTF-
- 8 when parsing torrc. Closes ticket 27428.
- o Major bugfixes (compilation):
- - Fix compilation on ARM (and other less-used CPUs) when compiling
- with OpenSSL before 1.1. Fixes bug 27781; bugfix on 0.3.4.1-alpha.
- o Major bugfixes (compilation, rust):
- - Rust tests can now build and run successfully with the
- --enable-fragile-hardening option enabled. Doing this currently
- requires the rust beta channel; it will be possible with stable
- rust once Rust version 1.31 is released. Patch from Alex Crichton.
- Fixes bugs 27272, 27273, and 27274. Bugfix on 0.3.1.1-alpha.
- o Major bugfixes (directory authority):
- - Actually check that the address we get from DirAuthority
- configuration line is valid IPv4. Explicitly disallow DirAuthority
- address to be a DNS hostname. Fixes bug 26488; bugfix
- on 0.1.2.10-rc.
- o Major bugfixes (embedding, main loop):
- - When DisableNetwork becomes set, actually disable periodic events
- that are already enabled. (Previously, we would refrain from
- enabling new ones, but we would leave the old ones turned on.)
- Fixes bug 28348; bugfix on 0.3.4.1-alpha.
- o Major bugfixes (main loop, bootstrap):
- - Make sure Tor bootstraps and works properly if only the
- ControlPort is set. Prior to this fix, Tor would only bootstrap
- when a client port was set (Socks, Trans, NATD, DNS or HTTPTunnel
- port). Fixes bug 27849; bugfix on 0.3.4.1-alpha.
- o Major bugfixes (onion service v3):
- - On an intro point for a version 3 onion service, stop closing
- introduction circuits on a NACK. This lets the client decide
- whether to reuse the circuit or discard it. Previously, we closed
- intro circuits when sending NACKs. Fixes bug 27841; bugfix on
- 0.3.2.1-alpha. Patch by Neel Chaunan.
- o Major bugfixes (OpenSSL, portability):
- - Fix our usage of named groups when running as a TLS 1.3 client in
- OpenSSL 1.1.1. Previously, we only initialized EC groups when
- running as a relay, which caused clients to fail to negotiate TLS
- 1.3 with relays. Fixes bug 28245; bugfix on 0.2.9.15 (when TLS 1.3
- support was added).
- o Major bugfixes (relay bandwidth statistics):
- - When we close relayed circuits, report the data in the circuit
- queues as being written in our relay bandwidth stats. This
- mitigates guard discovery and other attacks that close circuits
- for the explicit purpose of noticing this discrepancy in
- statistics. Fixes bug 23512; bugfix on 0.0.8pre3.
- o Major bugfixes (relay):
- - When our write bandwidth limit is exhausted, stop writing on the
- connection. Previously, we had a typo in the code that would make
- us stop reading instead, leading to relay connections being stuck
- indefinitely and consuming kernel RAM. Fixes bug 28089; bugfix
- on 0.3.4.1-alpha.
- - Always reactivate linked connections in the main loop so long as
- any linked connection has been active. Previously, connections
- serving directory information wouldn't get reactivated after the
- first chunk of data was sent (usually 32KB), which would prevent
- clients from bootstrapping. Fixes bug 28912; bugfix on
- 0.3.4.1-alpha. Patch by "cypherpunks3".
- o Major bugfixes (restart-in-process):
- - Fix a use-after-free error that could be caused by passing Tor an
- impossible set of options that would fail during options_act().
- Fixes bug 27708; bugfix on 0.3.3.1-alpha.
- o Minor features (admin tools):
- - Add a new --key-expiration option to print the expiration date of
- the signing cert in an ed25519_signing_cert file. Resolves
- issue 19506.
- o Minor features (build):
- - If you pass the "--enable-pic" option to configure, Tor will try
- to tell the compiler to build position-independent code suitable
- to link into a dynamic library. (The default remains -fPIE, for
- code suitable for a relocatable executable.) Closes ticket 23846.
- o Minor features (code correctness, testing):
- - Tor's build process now includes a "check-includes" make target to
- verify that no module of Tor relies on any headers from a higher-
- level module. We hope to use this feature over time to help
- refactor our codebase. Closes ticket 26447.
- o Minor features (code layout):
- - We have a new "lowest-level" error-handling API for use by code
- invoked from within the logging module. With this interface, the
- logging code is no longer at risk of calling into itself if a
- failure occurs while it is trying to log something. Closes
- ticket 26427.
- o Minor features (compilation):
- - When possible, place our warning flags in a separate file, to
- avoid flooding verbose build logs. Closes ticket 28924.
- - Tor's configure script now supports a --with-malloc= option to
- select your malloc implementation. Supported options are
- "tcmalloc", "jemalloc", "openbsd" (deprecated), and "system" (the
- default). Addresses part of ticket 20424. Based on a patch from
- Alex Xu.
- o Minor features (config):
- - The "auto" keyword in torrc is now case-insensitive. Closes
- ticket 26663.
- o Minor features (continuous integration):
- - Add a Travis CI build for --enable-nss on Linux gcc. Closes
- ticket 27751.
- - Add new CI job to Travis configuration to run stem-based
- integration tests. Closes ticket 27913.
- - Use the Travis Homebrew addon to install packages on macOS during
- Travis CI. The package list is the same, but the Homebrew addon
- does not do a `brew update` by default. Implements ticket 27738.
- - Report what program produced the mysterious core file that we
- occasionally see on Travis CI during make distcheck. Closes
- ticket 28024.
- - Don't do a distcheck with --disable-module-dirauth in Travis.
- Implements ticket 27252.
- - Install libcap-dev and libseccomp2-dev so these optional
- dependencies get tested on Travis CI. Closes ticket 26560.
- - Only run one online rust build in Travis, to reduce network
- errors. Skip offline rust builds on Travis for Linux gcc, because
- they're redundant. Implements ticket 27252.
- - Skip gcc on OSX in Travis CI, because it's rarely used. Skip a
- duplicate hardening-off build in Travis on Tor 0.2.9. Skip gcc on
- Linux with default settings, because all the non-default builds
- use gcc on Linux. Implements ticket 27252.
- o Minor features (continuous integration, Windows):
- - Always show the configure and test logs, and upload them as build
- artifacts, when building for Windows using Appveyor CI.
- Implements 28459.
- - Build tor on Windows Server 2012 R2 and Windows Server 2016 using
- Appveyor's CI. Closes ticket 28318.
- o Minor features (controller):
- - Emit CIRC_BW events as soon as we detect that we processed an
- invalid or otherwise dropped cell on a circuit. This allows
- vanguards and other controllers to react more quickly to dropped
- cells. Closes ticket 27678.
- - For purposes of CIRC_BW-based dropped cell detection, track half-
- closed stream ids, and allow their ENDs, SENDMEs, DATA and path
- bias check cells to arrive without counting it as dropped until
- either the END arrives, or the windows are empty. Closes
- ticket 25573.
- - Implement a 'GETINFO md/all' controller command to enable getting
- all known microdescriptors. Closes ticket 8323.
- - The GETINFO command now support an "uptime" argument, to return
- Tor's uptime in seconds. Closes ticket 25132.
- o Minor features (denial-of-service avoidance):
- - Make our OOM handler aware of the DNS cache so that it doesn't
- fill up the memory. This check is important for our DoS mitigation
- subsystem. Closes ticket 18642. Patch by Neel Chauhan.
- o Minor features (development):
- - Tor's makefile now supports running the "clippy" Rust style tool
- on our Rust code. Closes ticket 22156.
- o Minor features (directory authority):
- - There is no longer an artificial upper limit on the length of
- bandwidth lines. Closes ticket 26223.
- - When a bandwidth file is used to obtain the bandwidth measurements,
- include this bandwidth file headers in the votes. Closes
- ticket 3723.
- - Improved support for networks with only a single authority or a
- single fallback directory. Patch from Gabriel Somlo. Closes
- ticket 25928.
- o Minor features (embedding API):
- - The Tor controller API now supports a function to launch Tor with
- a preconstructed owning controller FD, so that embedding
- applications don't need to manage controller ports and
- authentication. Closes ticket 24204.
- - The Tor controller API now has a function that returns the name
- and version of the backend implementing the API. Closes
- ticket 26947.
- o Minor features (fallback directory list):
- - Replace the 150 fallbacks originally introduced in Tor
- 0.3.3.1-alpha in January 2018 (of which ~115 were still
- functional), with a list of 157 fallbacks (92 new, 65 existing, 85
- removed) generated in December 2018. Closes ticket 24803.
- o Minor features (geoip):
- - Update geoip and geoip6 to the January 3 2019 Maxmind GeoLite2
- Country database. Closes ticket 29012.
- o Minor features (memory management):
- - Get Libevent to use the same memory allocator as Tor, by calling
- event_set_mem_functions() during initialization. Resolves
- ticket 8415.
- o Minor features (memory usage):
- - When not using them, store legacy TAP public onion keys in DER-
- encoded format, rather than as expanded public keys. This should
- save several megabytes on typical clients. Closes ticket 27246.
- o Minor features (OpenSSL bug workaround):
- - Work around a bug in OpenSSL 1.1.1a, which prevented the TLS 1.3
- key export function from handling long labels. When this bug is
- detected, Tor will disable TLS 1.3. We recommend upgrading to a
- version of OpenSSL without this bug when it becomes available.
- Closes ticket 28973.
- o Minor features (OpenSSL):
- - When possible, use RFC5869 HKDF implementation from OpenSSL rather
- than our own. Resolves ticket 19979.
- o Minor features (performance):
- - Remove about 96% of the work from the function that we run at
- startup to test our curve25519_basepoint implementation. Since
- this function has yet to find an actual failure, we now only run
- it for 8 iterations instead of 200. Based on our profile
- information, this change should save around 8% of our startup time
- on typical desktops, and may have a similar effect on other
- platforms. Closes ticket 28838.
- - Stop re-validating our hardcoded Diffie-Hellman parameters on
- every startup. Doing this wasted time and cycles, especially on
- low-powered devices. Closes ticket 28851.
- o Minor features (Rust, code quality):
- - Improve rust code quality in the rust protover implementation by
- making it more idiomatic. Includes changing an internal API to
- take &str instead of &String. Closes ticket 26492.
- o Minor features (testing):
- - Add scripts/test/chutney-git-bisect.sh, for bisecting using
- chutney. Implements ticket 27211.
- o Minor features (tor-resolve):
- - The tor-resolve utility can now be used with IPv6 SOCKS proxies.
- Side-effect of the refactoring for ticket 26526.
- o Minor features (UI):
- - Log each included configuration file or directory as we read it,
- to provide more visibility about where Tor is reading from. Patch
- from Unto Sten; closes ticket 27186.
- - Lower log level of "Scheduler type KIST has been enabled" to INFO.
- Closes ticket 26703.
- o Minor bugfixes (32-bit OSX and iOS, timing):
- - Fix an integer overflow bug in our optimized 32-bit millisecond-
- difference algorithm for 32-bit Apple platforms. Previously, it
- would overflow when calculating the difference between two times
- more than 47 days apart. Fixes part of bug 27139; bugfix
- on 0.3.4.1-alpha.
- - Improve the precision of our 32-bit millisecond difference
- algorithm for 32-bit Apple platforms. Fixes part of bug 27139;
- bugfix on 0.3.4.1-alpha.
- - Relax the tolerance on the mainloop/update_time_jumps test when
- running on 32-bit Apple platforms. Fixes part of bug 27139; bugfix
- on 0.3.4.1-alpha.
- o Minor bugfixes (bootstrap):
- - Try harder to get descriptors in non-exit test networks, by using
- the mid weight for the third hop when there are no exits. Fixes
- bug 27237; bugfix on 0.2.6.2-alpha.
- o Minor bugfixes (C correctness):
- - Avoid casting smartlist index to int implicitly, as it may trigger
- a warning (-Wshorten-64-to-32). Fixes bug 26282; bugfix on
- 0.2.3.13-alpha, 0.2.7.1-alpha and 0.2.1.1-alpha.
- - Use time_t for all values in
- predicted_ports_prediction_time_remaining(). Rework the code that
- computes difference between durations/timestamps. Fixes bug 27165;
- bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (client, memory usage):
- - When not running as a directory cache, there is no need to store
- the text of the current consensus networkstatus in RAM.
- Previously, however, clients would store it anyway, at a cost of
- over 5 MB. Now, they do not. Fixes bug 27247; bugfix
- on 0.3.0.1-alpha.
- o Minor bugfixes (client, ReachableAddresses):
- - Instead of adding a "reject *:*" line to ReachableAddresses when
- loading the configuration, add one to the policy after parsing it
- in parse_reachable_addresses(). This prevents extra "reject *.*"
- lines from accumulating on reloads. Fixes bug 20874; bugfix on
- 0.1.1.5-alpha. Patch by Neel Chauhan.
- o Minor bugfixes (code quality):
- - Rename sandbox_getaddrinfo() and other functions to no longer
- misleadingly suggest that they are sandbox-only. Fixes bug 26525;
- bugfix on 0.2.7.1-alpha.
- o Minor bugfixes (code safety):
- - Rewrite our assertion macros so that they no longer suppress the
- compiler's -Wparentheses warnings. Fixes bug 27709; bugfix
- on 0.0.6.
- o Minor bugfixes (compilation):
- - Initialize a variable unconditionally in aes_new_cipher(), since
- some compilers cannot tell that we always initialize it before
- use. Fixes bug 28413; bugfix on 0.2.9.3-alpha.
- o Minor bugfixes (configuration):
- - Refuse to start with relative file paths and RunAsDaemon set
- (regression from the fix for bug 22731). Fixes bug 28298; bugfix
- on 0.3.3.1-alpha.
- o Minor bugfixes (configuration, Onion Services):
- - In rend_service_parse_port_config(), disallow any input to remain
- after address-port pair was parsed. This will catch address and
- port being whitespace-separated by mistake of the user. Fixes bug
- 27044; bugfix on 0.2.9.10.
- o Minor bugfixes (connection, relay):
- - Avoid a logging a BUG() stacktrace when closing connection held
- open because the write side is rate limited but not the read side.
- Now, the connection read side is simply shut down until Tor is
- able to flush the connection and close it. Fixes bug 27750; bugfix
- on 0.3.4.1-alpha.
- o Minor bugfixes (continuous integration, Windows):
- - Stop reinstalling identical packages in our Windows CI. Fixes bug
- 27464; bugfix on 0.3.4.1-alpha.
- - Install only the necessary mingw packages during our appveyor
- builds. This change makes the build a little faster, and prevents
- a conflict with a preinstalled mingw openssl that appveyor now
- ships. Fixes bugs 27765 and 27943; bugfix on 0.3.4.2-alpha.
- - Explicitly specify the path to the OpenSSL library and do not
- download OpenSSL from Pacman, but instead use the library that is
- already provided by AppVeyor. Fixes bug 28574; bugfix on master.
- - Manually configure the zstd compiler options, when building using
- mingw on Appveyor Windows CI. The MSYS2 mingw zstd package does
- not come with a pkg-config file. Fixes bug 28454; bugfix
- on 0.3.4.1-alpha.
- - Stop using an external OpenSSL install, and stop installing MSYS2
- packages, when building using mingw on Appveyor Windows CI. Fixes
- bug 28399; bugfix on 0.3.4.1-alpha.
- o Minor bugfixes (controller):
- - Consider all routerinfo errors other than "not a server" to be
- transient for the purpose of "GETINFO exit-policy/*" controller
- request. Print stacktrace in the unlikely case of failing to
- recompute routerinfo digest. Fixes bug 27034; bugfix
- on 0.3.4.1-alpha.
- o Minor bugfixes (correctness):
- - Fix an unreached code path where we checked the value of
- "hostname" inside send_resolved_hostname_cell(). Previously, we
- used it before checking it; now we check it first. Fixes bug
- 28879; bugfix on 0.1.2.7-alpha.
- o Minor bugfixes (directory connection shutdown):
- - Avoid a double-close when shutting down a stalled directory
- connection. Fixes bug 26896; bugfix on 0.3.4.1-alpha.
- o Minor bugfixes (directory permissions):
- - When a user requests a group-readable DataDirectory, give it to
- them. Previously, when the DataDirectory and the CacheDirectory
- were the same, the default setting (0) for
- CacheDirectoryGroupReadable would override the setting for
- DataDirectoryGroupReadable. Fixes bug 26913; bugfix
- on 0.3.3.1-alpha.
- o Minor bugfixes (HTTP tunnel):
- - Fix a bug warning when closing an HTTP tunnel connection due to an
- HTTP request we couldn't handle. Fixes bug 26470; bugfix
- on 0.3.2.1-alpha.
- o Minor bugfixes (ipv6):
- - In addrs_in_same_network_family(), we choose the subnet size based
- on the IP version (IPv4 or IPv6). Previously, we chose a fixed
- subnet size of /16 for both IPv4 and IPv6 addresses. Fixes bug
- 15518; bugfix on 0.2.3.1-alpha. Patch by Neel Chauhan.
- o Minor bugfixes (Linux seccomp2 sandbox):
- - Permit the "shutdown()" system call, which is apparently used by
- OpenSSL under some circumstances. Fixes bug 28183; bugfix
- on 0.2.5.1-alpha.
- o Minor bugfixes (logging):
- - Stop talking about the Named flag in log messages. Clients have
- ignored the Named flag since 0.3.2. Fixes bug 28441; bugfix
- on 0.3.2.1-alpha.
- - As a precaution, do an early return from log_addr_has_changed() if
- Tor is running as client. Also, log a stack trace for debugging as
- this function should only be called when Tor runs as server. Fixes
- bug 26892; bugfix on 0.1.1.9-alpha.
- - Refrain from mentioning bug 21018 in the logs, as it is already
- fixed. Fixes bug 25477; bugfix on 0.2.9.8.
- o Minor bugfixes (logging, documentation):
- - When SafeLogging is enabled, scrub IP address in
- channel_tls_process_netinfo_cell(). Also, add a note to manpage
- that scrubbing is not guaranteed on loglevels below Notice. Fixes
- bug 26882; bugfix on 0.2.4.10-alpha.
- o Minor bugfixes (memory leaks):
- - Fix a harmless memory leak in libtorrunner.a. Fixes bug 28419;
- bugfix on 0.3.3.1-alpha. Patch from Martin Kepplinger.
- - Fix a small memory leak when calling Tor with --dump-config. Fixes
- bug 27893; bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (netflow padding):
- - Ensure circuitmux queues are empty before scheduling or sending
- padding. Fixes bug 25505; bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (onion service v2):
- - Log at level "info", not "warning", in the case that we do not
- have a consensus when a .onion request comes in. This can happen
- normally while bootstrapping. Fixes bug 27040; bugfix
- on 0.2.8.2-alpha.
- o Minor bugfixes (onion service v3):
- - When deleting an ephemeral onion service (DEL_ONION), do not close
- any rendezvous circuits in order to let the existing client
- connections finish by themselves or closed by the application. The
- HS v2 is doing that already so now we have the same behavior for
- all versions. Fixes bug 28619; bugfix on 0.3.3.1-alpha.
- - Build the service descriptor's signing key certificate before
- uploading, so we always have a fresh one: leaving no chances for
- it to expire service side. Fixes bug 27838; bugfix
- on 0.3.2.1-alpha.
- - Stop dumping a stack trace when trying to connect to an intro
- point without having a descriptor for it. Fixes bug 27774; bugfix
- on 0.3.2.1-alpha.
- - When selecting a v3 rendezvous point, don't only look at the
- protover, but also check whether the curve25519 onion key is
- present. This way we avoid picking a relay that supports the v3
- rendezvous but for which we don't have the microdescriptor. Fixes
- bug 27797; bugfix on 0.3.2.1-alpha.
- - Close all SOCKS request (for the same .onion) if the newly fetched
- descriptor is unusable. Before that, we would close only the first
- one leaving the other hanging and let to time out by themselves.
- Fixes bug 27410; bugfix on 0.3.2.1-alpha.
- - When the onion service directory can't be created or has the wrong
- permissions, do not log a stack trace. Fixes bug 27335; bugfix
- on 0.3.2.1-alpha.
- - When replacing a descriptor in the client cache, make sure to
- close all client introduction circuits for the old descriptor, so
- we don't end up with unusable leftover circuits. Fixes bug 27471;
- bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (OS compatibility):
- - Properly handle configuration changes that move a listener to/from
- wildcard IP address. If the first attempt to bind a socket fails,
- close the old listener and try binding the socket again. Fixes bug
- 17873; bugfix on 0.0.8pre-1.
- o Minor bugfixes (performance)::
- - Rework node_is_a_configured_bridge() to no longer call
- node_get_all_orports(), which was performing too many memory
- allocations. Fixes bug 27224; bugfix on 0.2.3.9.
- o Minor bugfixes (protover):
- - Reject protocol names containing bytes other than alphanumeric
- characters and hyphens ([A-Za-z0-9-]). Fixes bug 27316; bugfix
- on 0.2.9.4-alpha.
- o Minor bugfixes (protover, rust):
- - Reject extra commas in version strings. Fixes bug 27197; bugfix
- on 0.3.3.3-alpha.
- - protover_all_supported() would attempt to allocate up to 16GB on
- some inputs, leading to a potential memory DoS. Fixes bug 27206;
- bugfix on 0.3.3.5-rc.
- - Compute protover votes correctly in the rust version of the
- protover code. Previously, the protover rewrite in 24031 allowed
- repeated votes from the same voter for the same protocol version
- to be counted multiple times in protover_compute_vote(). Fixes bug
- 27649; bugfix on 0.3.3.5-rc.
- - Reject protover names that contain invalid characters. Fixes bug
- 27687; bugfix on 0.3.3.1-alpha.
- o Minor bugfixes (relay shutdown, systemd):
- - Notify systemd of ShutdownWaitLength so it can be set to longer
- than systemd's TimeoutStopSec. In Tor's systemd service file, set
- TimeoutSec to 60 seconds to allow Tor some time to shut down.
- Fixes bug 28113; bugfix on 0.2.6.2-alpha.
- o Minor bugfixes (relay statistics):
- - Update relay descriptor on bandwidth changes only when the uptime
- is smaller than 24h, in order to reduce the efficiency of guard
- discovery attacks. Fixes bug 24104; bugfix on 0.1.1.6-alpha.
- o Minor bugfixes (relay):
- - Consider the fact that we'll be making direct connections to our
- entry and guard nodes when computing the fraction of nodes that
- have their descriptors. Also, if we are using bridges and there is
- at least one bridge with a full descriptor, treat the fraction of
- guards available as 100%. Fixes bug 25886; bugfix on 0.2.4.10-alpha.
- Patch by Neel Chauhan.
- - Update the message logged on relays when DirCache is disabled.
- Since 0.3.3.5-rc, authorities require DirCache (V2Dir) for the
- Guard flag. Fixes bug 24312; bugfix on 0.3.3.5-rc.
- o Minor bugfixes (testing):
- - Stop running stem's unit tests as part of "make test-stem", but
- continue to run stem's unit and online tests during "make test-
- stem-full". Fixes bug 28568; bugfix on 0.2.6.3-alpha.
- - Stop leaking memory in an entry guard unit test. Fixes bug 28554;
- bugfix on 0.3.0.1-alpha.
- - Make the hs_service tests use the same time source when creating
- the introduction point and when testing it. Now tests work better
- on very slow systems like ARM or Travis. Fixes bug 27810; bugfix
- on 0.3.2.1-alpha.
- - Revise the "conditionvar_timeout" test so that it succeeds even on
- heavily loaded systems where the test threads are not scheduled
- within 200 msec. Fixes bug 27073; bugfix on 0.2.6.3-alpha.
- - Fix two unit tests to work when HOME environment variable is not
- set. Fixes bug 27096; bugfix on 0.2.8.1-alpha.
- - If a unit test running in a subprocess exits abnormally or with a
- nonzero status code, treat the test as having failed, even if the
- test reported success. Without this fix, memory leaks don't cause
- the tests to fail, even with LeakSanitizer. Fixes bug 27658;
- bugfix on 0.2.2.4-alpha.
- - When logging a version mismatch in our openssl_version tests,
- report the actual offending version strings. Fixes bug 26152;
- bugfix on 0.2.9.1-alpha.
- - Fix forking tests on Windows when there is a space somewhere in
- the path. Fixes bug 26437; bugfix on 0.2.2.4-alpha.
- o Minor bugfixes (Windows):
- - Correctly identify Windows 8.1, Windows 10, and Windows Server
- 2008 and later from their NT versions. Fixes bug 28096; bugfix on
- 0.2.2.34; reported by Keifer Bly.
- - On recent Windows versions, the GetVersionEx() function may report
- an earlier Windows version than the running OS. To avoid user
- confusion, add "[or later]" to Tor's version string on affected
- versions of Windows. Fixes bug 28096; bugfix on 0.2.2.34; reported
- by Keifer Bly.
- - Remove Windows versions that were never supported by the
- GetVersionEx() function. Stop duplicating the latest Windows
- version in get_uname(). Fixes bug 28096; bugfix on 0.2.2.34;
- reported by Keifer Bly.
- o Code simplification and refactoring:
- - When parsing a port configuration, make it more obvious to static
- analyzer tools that we always initialize the address. Closes
- ticket 28881.
- - Divide more large Tor source files -- especially ones that span
- multiple areas of functionality -- into smaller parts, including
- onion.c and main.c. Closes ticket 26747.
- - Divide the "routerparse.c" module into separate modules for each
- group of parsed objects. Closes ticket 27924.
- - Move protover_rust.c to the same place protover.c was moved to.
- Closes ticket 27814.
- - Split directory.c into separate pieces for client, server, and
- common functionality. Closes ticket 26744.
- - Split the non-statistics-related parts from the rephist.c and
- geoip.c modules. Closes ticket 27892.
- - Split the router.c file into relay-only and shared components, to
- help with future modularization. Closes ticket 27864.
- - Divide the routerlist.c and dirserv.c modules into smaller parts.
- Closes ticket 27799.
- - 'updateFallbackDirs.py' now ignores the blacklist file, as it's not
- longer needed. Closes ticket 26502.
- - Include paths to header files within Tor are now qualified by
- directory within the top-level src directory.
- - Many structures have been removed from the centralized "or.h"
- header, and moved into their own headers. This will allow us to
- reduce the number of places in the code that rely on each
- structure's contents and layout. Closes ticket 26383.
- - Remove ATTR_NONNULL macro from codebase. Resolves ticket 26527.
- - Remove GetAdaptersAddresses_fn_t. The code that used it was
- removed as part of the 26481 refactor. Closes ticket 27467.
- - Rework Tor SOCKS server code to use Trunnel and benefit from
- autogenerated functions for parsing and generating SOCKS wire
- format. New implementation is cleaner, more maintainable and
- should be less prone to heartbleed-style vulnerabilities.
- Implements a significant fraction of ticket 3569.
- - Split sampled_guards_update_from_consensus() and
- select_entry_guard_for_circuit() into subfunctions. In
- entry_guards_update_primary() unite three smartlist enumerations
- into one and move smartlist comparison code out of the function.
- Closes ticket 21349.
- - Tor now assumes that you have standards-conformant stdint.h and
- inttypes.h headers when compiling. Closes ticket 26626.
- - Unify our bloom filter logic. Previously we had two copies of this
- code: one for routerlist filtering, and one for address set
- calculations. Closes ticket 26510.
- - Use the simpler strcmpstart() helper in
- rend_parse_v2_service_descriptor instead of strncmp(). Closes
- ticket 27630.
- - Utility functions that can perform a DNS lookup are now wholly
- separated from those that can't, in separate headers and C
- modules. Closes ticket 26526.
- o Documentation:
- - In the tor-resolve(1) manpage, fix the reference to socks-
- extensions.txt by adding a web URL. Resolves ticket 27853.
- - Mention that we require Python to be 2.7 or newer for some
- integration tests that we ship with Tor. Resolves ticket 27677.
- - Copy paragraph and URL to Tor's code of conduct document from
- CONTRIBUTING to new CODE_OF_CONDUCT file. Resolves ticket 26638.
- - Remove old instructions from INSTALL document. Closes ticket 26588.
- - Warn users that they should not include MyFamily line(s) in their
- torrc when running Tor bridge. Closes ticket 26908.
- o Removed features:
- - Tor no longer supports building with the dmalloc library. For
- debugging memory issues, we suggest using gperftools or msan
- instead. Closes ticket 26426.
- - Tor no longer attempts to run on Windows environments without the
- GetAdaptersAddresses() function. This function has existed since
- Windows XP, which is itself already older than we support.
- - Remove Tor2web functionality for version 2 onion services. The
- Tor2webMode and Tor2webRendezvousPoints options are now obsolete.
- (This feature was never shipped in vanilla Tor and it was only
- possible to use this feature by building the support at compile
- time. Tor2webMode is not implemented for version 3 onion services.)
- Closes ticket 26367.
- o Testing:
- - Increase logging and tag all log entries with timestamps in
- test_rebind.py. Provides diagnostics for issue 28229.
- o Code simplification and refactoring (shared random, dirauth):
- - Change many tor_assert() to use BUG() instead. The idea is to not
- crash a dirauth but rather scream loudly with a stacktrace and let
- it continue run. The shared random subsystem is very resilient and
- if anything wrong happens with it, at worst a non coherent value
- will be put in the vote and discarded by the other authorities.
- Closes ticket 19566.
- o Documentation (onion services):
- - Improve HSv3 client authorization by making some options more
- explicit and detailed. Closes ticket 28026. Patch by Mike Tigas.
- - Document in the man page that changing ClientOnionAuthDir value or
- adding a new file in the directory will not work at runtime upon
- sending a HUP if Sandbox 1. Closes ticket 28128.
- - Note in the man page that the only real way to fully revoke an
- onion service v3 client authorization is by restarting the tor
- process. Closes ticket 28275.
- Changes in version 0.3.4.9 - 2018-11-02
- Tor 0.3.4.9 is the second stable release in its series; it backports
- numerous fixes, including a fix for a bandwidth management bug that
- was causing memory exhaustion on relays. Anyone running an earlier
- version of Tor 0.3.4.9 should upgrade.
- o Major bugfixes (compilation, backport from 0.3.5.3-alpha):
- - Fix compilation on ARM (and other less-used CPUs) when compiling
- with OpenSSL before 1.1. Fixes bug 27781; bugfix on 0.3.4.1-alpha.
- o Major bugfixes (mainloop, bootstrap, backport from 0.3.5.3-alpha):
- - Make sure Tor bootstraps and works properly if only the
- ControlPort is set. Prior to this fix, Tor would only bootstrap
- when a client port was set (Socks, Trans, NATD, DNS or HTTPTunnel
- port). Fixes bug 27849; bugfix on 0.3.4.1-alpha.
- o Major bugfixes (relay, backport from 0.3.5.3-alpha):
- - When our write bandwidth limit is exhausted, stop writing on the
- connection. Previously, we had a typo in the code that would make
- us stop reading instead, leading to relay connections being stuck
- indefinitely and consuming kernel RAM. Fixes bug 28089; bugfix
- on 0.3.4.1-alpha.
- o Major bugfixes (restart-in-process, backport from 0.3.5.1-alpha):
- - Fix a use-after-free error that could be caused by passing Tor an
- impossible set of options that would fail during options_act().
- Fixes bug 27708; bugfix on 0.3.3.1-alpha.
- o Minor features (continuous integration, backport from 0.3.5.1-alpha):
- - Don't do a distcheck with --disable-module-dirauth in Travis.
- Implements ticket 27252.
- - Only run one online rust build in Travis, to reduce network
- errors. Skip offline rust builds on Travis for Linux gcc, because
- they're redundant. Implements ticket 27252.
- - Skip gcc on OSX in Travis CI, because it's rarely used. Skip a
- duplicate hardening-off build in Travis on Tor 0.2.9. Skip gcc on
- Linux with default settings, because all the non-default builds
- use gcc on Linux. Implements ticket 27252.
- o Minor features (continuous integration, backport from 0.3.5.3-alpha):
- - Use the Travis Homebrew addon to install packages on macOS during
- Travis CI. The package list is the same, but the Homebrew addon
- does not do a `brew update` by default. Implements ticket 27738.
- o Minor features (geoip):
- - Update geoip and geoip6 to the October 9 2018 Maxmind GeoLite2
- Country database. Closes ticket 27991.
- o Minor bugfixes (32-bit OSX and iOS, timing, backport from 0.3.5.2-alpha):
- - Fix an integer overflow bug in our optimized 32-bit millisecond-
- difference algorithm for 32-bit Apple platforms. Previously, it
- would overflow when calculating the difference between two times
- more than 47 days apart. Fixes part of bug 27139; bugfix
- on 0.3.4.1-alpha.
- - Improve the precision of our 32-bit millisecond difference
- algorithm for 32-bit Apple platforms. Fixes part of bug 27139;
- bugfix on 0.3.4.1-alpha.
- - Relax the tolerance on the mainloop/update_time_jumps test when
- running on 32-bit Apple platforms. Fixes part of bug 27139; bugfix
- on 0.3.4.1-alpha.
- o Minor bugfixes (C correctness, to appear in 0.3.5.4-alpha):
- - Avoid undefined behavior in an end-of-string check when parsing
- the BEGIN line in a directory object. Fixes bug 28202; bugfix
- on 0.2.0.3-alpha.
- o Minor bugfixes (CI, appveyor, to appear in 0.3.5.4-alpha):
- - Only install the necessary mingw packages during our appveyor
- builds. This change makes the build a little faster, and prevents
- a conflict with a preinstalled mingw openssl that appveyor now
- ships. Fixes bugs 27943 and 27765; bugfix on 0.3.4.2-alpha.
- o Minor bugfixes (code safety, backport from 0.3.5.3-alpha):
- - Rewrite our assertion macros so that they no longer suppress the
- compiler's -Wparentheses warnings. Fixes bug 27709; bugfix
- o Minor bugfixes (continuous integration, backport from 0.3.5.1-alpha):
- - Stop reinstalling identical packages in our Windows CI. Fixes bug
- 27464; bugfix on 0.3.4.1-alpha.
- o Minor bugfixes (directory authority, to appear in 0.3.5.4-alpha):
- - Log additional info when we get a relay that shares an ed25519 ID
- with a different relay, instead making a BUG() warning. Fixes bug
- 27800; bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (directory connection shutdown, backport from 0.3.5.1-alpha):
- - Avoid a double-close when shutting down a stalled directory
- connection. Fixes bug 26896; bugfix on 0.3.4.1-alpha.
- o Minor bugfixes (HTTP tunnel, backport from 0.3.5.1-alpha):
- - Fix a bug warning when closing an HTTP tunnel connection due to an
- HTTP request we couldn't handle. Fixes bug 26470; bugfix
- on 0.3.2.1-alpha.
- o Minor bugfixes (netflow padding, backport from 0.3.5.1-alpha):
- - Ensure circuitmux queues are empty before scheduling or sending
- padding. Fixes bug 25505; bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (onion service v3, backport from 0.3.5.1-alpha):
- - When the onion service directory can't be created or has the wrong
- permissions, do not log a stack trace. Fixes bug 27335; bugfix
- on 0.3.2.1-alpha.
- o Minor bugfixes (onion service v3, backport from 0.3.5.2-alpha):
- - Close all SOCKS request (for the same .onion) if the newly fetched
- descriptor is unusable. Before that, we would close only the first
- one leaving the other hanging and let to time out by themselves.
- Fixes bug 27410; bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (onion service v3, backport from 0.3.5.3-alpha):
- - When selecting a v3 rendezvous point, don't only look at the
- protover, but also check whether the curve25519 onion key is
- present. This way we avoid picking a relay that supports the v3
- rendezvous but for which we don't have the microdescriptor. Fixes
- bug 27797; bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (protover, backport from 0.3.5.3-alpha):
- - Reject protocol names containing bytes other than alphanumeric
- characters and hyphens ([A-Za-z0-9-]). Fixes bug 27316; bugfix
- on 0.2.9.4-alpha.
- o Minor bugfixes (rust, backport from 0.3.5.1-alpha):
- - Compute protover votes correctly in the rust version of the
- protover code. Previously, the protover rewrite in 24031 allowed
- repeated votes from the same voter for the same protocol version
- to be counted multiple times in protover_compute_vote(). Fixes bug
- 27649; bugfix on 0.3.3.5-rc.
- - Reject protover names that contain invalid characters. Fixes bug
- 27687; bugfix on 0.3.3.1-alpha.
- o Minor bugfixes (rust, backport from 0.3.5.2-alpha):
- - protover_all_supported() would attempt to allocate up to 16GB on
- some inputs, leading to a potential memory DoS. Fixes bug 27206;
- bugfix on 0.3.3.5-rc.
- o Minor bugfixes (rust, directory authority, to appear in 0.3.5.4-alpha):
- - Fix an API mismatch in the rust implementation of
- protover_compute_vote(). This bug could have caused crashes on any
- directory authorities running Tor with Rust (which we do not yet
- recommend). Fixes bug 27741; bugfix on 0.3.3.6.
- o Minor bugfixes (rust, to appear in 0.3.5.4-alpha):
- - Fix a potential null dereference in protover_all_supported(). Add
- a test for it. Fixes bug 27804; bugfix on 0.3.3.1-alpha.
- - Return a string that can be safely freed by C code, not one
- created by the rust allocator, in protover_all_supported(). Fixes
- bug 27740; bugfix on 0.3.3.1-alpha.
- o Minor bugfixes (testing, backport from 0.3.5.1-alpha):
- - If a unit test running in a subprocess exits abnormally or with a
- nonzero status code, treat the test as having failed, even if the
- test reported success. Without this fix, memory leaks don't cause
- the tests to fail, even with LeakSanitizer. Fixes bug 27658;
- bugfix on 0.2.2.4-alpha.
- o Minor bugfixes (testing, backport from 0.3.5.3-alpha):
- - Make the hs_service tests use the same time source when creating
- the introduction point and when testing it. Now tests work better
- on very slow systems like ARM or Travis. Fixes bug 27810; bugfix
- on 0.3.2.1-alpha.
- o Minor bugfixes (testing, to appear in 0.3.5.4-alpha):
- - Treat backtrace test failures as expected on BSD-derived systems
- (NetBSD, OpenBSD, and macOS/Darwin) until we solve bug 17808.
- (FreeBSD failures have been treated as expected since 18204 in
- 0.2.8.) Fixes bug 27948; bugfix on 0.2.5.2-alpha.
- Changes in version 0.2.9.17 - 2018-09-10
- Tor 0.2.9.17 backports numerous bugfixes from later versions of Tor.
- o Minor features (compatibility, backport from 0.3.4.8):
- - Tell OpenSSL to maintain backward compatibility with previous
- RSA1024/DH1024 users in Tor. With OpenSSL 1.1.1-pre6, these
- ciphers are disabled by default. Closes ticket 27344.
- o Minor features (continuous integration, backport from 0.3.4.7-rc):
- - Enable macOS builds in our Travis CI configuration. Closes
- ticket 24629.
- - Install libcap-dev and libseccomp2-dev so these optional
- dependencies get tested on Travis CI. Closes ticket 26560.
- - Run asciidoc during Travis CI. Implements ticket 27087.
- - Use ccache in our Travis CI configuration. Closes ticket 26952.
- o Minor features (geoip):
- - Update geoip and geoip6 to the August 7 2018 Maxmind GeoLite2
- Country database. Closes ticket 27089.
- o Minor bugfixes (compilation, backport from 0.3.4.6-rc):
- - When compiling with --enable-openbsd-malloc or --enable-tcmalloc,
- tell the compiler not to include the system malloc implementation.
- Fixes bug 20424; bugfix on 0.2.0.20-rc.
- o Minor bugfixes (compilation, backport from 0.3.4.7-rc):
- - Silence a spurious compiler warning on the GetAdaptersAddresses
- function pointer cast. This issue is already fixed by 26481 in
- 0.3.5 and later, by removing the lookup and cast. Fixes bug 27465;
- bugfix on 0.2.3.11-alpha.
- - Stop calling SetProcessDEPPolicy() on 64-bit Windows. It is not
- supported, and always fails. Some compilers warn about the
- function pointer cast on 64-bit Windows. Fixes bug 27461; bugfix
- on 0.2.2.23-alpha.
- o Minor bugfixes (compilation, windows, backport from 0.3.4.7-rc):
- - Don't link or search for pthreads when building for Windows, even
- if we are using build environment (like mingw) that provides a
- pthreads library. Fixes bug 27081; bugfix on 0.1.0.1-rc.
- o Minor bugfixes (continuous integration, backport from 0.3.4.6-rc):
- - Skip a pair of unreliable key generation tests on Windows, until
- the underlying issue in bug 26076 is resolved. Fixes bug 26830 and
- bug 26853; bugfix on 0.2.7.3-rc and 0.3.2.1-alpha respectively.
- o Minor bugfixes (continuous integration, backport from 0.3.4.7-rc):
- - Pass the module flags to distcheck configure, and log the flags
- before running configure. (Backported to 0.2.9 and later as a
- precaution.) Fixes bug 27088; bugfix on 0.3.4.1-alpha.
- o Minor bugfixes (continuous integration, backport from 0.3.4.8):
- - When a Travis build fails, and showing a log fails, keep trying to
- show the other logs. Fixes bug 27453; bugfix on 0.3.4.7-rc.
- - When we use echo in Travis, don't pass a --flag as the first
- argument. Fixes bug 27418; bugfix on 0.3.4.7-rc.
- o Minor bugfixes (directory authority, backport from 0.3.4.6-rc):
- - When voting for recommended versions, make sure that all of the
- versions are well-formed and parsable. Fixes bug 26485; bugfix
- on 0.1.1.6-alpha.
- o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.4.7-rc):
- - Fix a bug in out sandboxing rules for the openat() syscall.
- Previously, no openat() call would be permitted, which would break
- filesystem operations on recent glibc versions. Fixes bug 25440;
- bugfix on 0.2.9.15. Diagnosis and patch from Daniel Pinto.
- o Minor bugfixes (onion services, backport from 0.3.4.8):
- - Silence a spurious compiler warning in
- rend_client_send_introduction(). Fixes bug 27463; bugfix
- on 0.1.1.2-alpha.
- o Minor bugfixes (single onion services, Tor2web, backport from 0.3.4.6-rc):
- - Log a protocol warning when single onion services or Tor2web clients
- fail to authenticate direct connections to relays.
- Fixes bug 26924; bugfix on 0.2.9.1-alpha.
- o Minor bugfixes (testing, backport from 0.3.4.6-rc):
- - Disable core dumps in test_bt.sh, to avoid failures in "make
- distcheck". Fixes bug 26787; bugfix on 0.2.5.2-alpha.
- o Minor bugfixes (testing, chutney, backport from 0.3.4.8):
- - Before running make test-network-all, delete old logs and test
- result files, to avoid spurious failures. Fixes bug 27295; bugfix
- on 0.2.7.3-rc.
- o Minor bugfixes (testing, openssl compatibility, backport from 0.3.4.7-rc):
- - Our "tortls/cert_matches_key" unit test no longer relies on
- OpenSSL internals. Previously, it relied on unsupported OpenSSL
- behavior in a way that caused it to crash with OpenSSL 1.0.2p.
- Fixes bug 27226; bugfix on 0.2.5.1-alpha.
- o Minor bugfixes (Windows, compilation, backport from 0.3.4.7-rc):
- - Silence a compilation warning on MSVC 2017 and clang-cl. Fixes bug
- 27185; bugfix on 0.2.2.2-alpha.
- Changes in version 0.3.2.12 - 2018-09-10
- Tor 0.3.2.12 backport numerous fixes from later versions of Tor.
- o Minor features (compatibility, backport from 0.3.4.8):
- - Tell OpenSSL to maintain backward compatibility with previous
- RSA1024/DH1024 users in Tor. With OpenSSL 1.1.1-pre6, these
- ciphers are disabled by default. Closes ticket 27344.
- o Minor features (continuous integration, backport from 0.3.4.7-rc):
- - Enable macOS builds in our Travis CI configuration. Closes
- ticket 24629.
- - Install libcap-dev and libseccomp2-dev so these optional
- dependencies get tested on Travis CI. Closes ticket 26560.
- - Run asciidoc during Travis CI. Implements ticket 27087.
- - Use ccache in our Travis CI configuration. Closes ticket 26952.
- o Minor features (continuous integration, rust, backport from 0.3.4.7-rc):
- - Use cargo cache in our Travis CI configuration. Closes
- ticket 26952.
- o Minor features (controller, backport from 0.3.4.6-rc):
- - The control port now exposes the list of HTTPTunnelPorts and
- ExtOrPorts via GETINFO net/listeners/httptunnel and
- net/listeners/extor respectively. Closes ticket 26647.
- o Minor features (directory authorities, backport from 0.3.4.7-rc):
- - Authorities no longer vote to make the subprotocol version
- "LinkAuth=1" a requirement: it is unsupportable with NSS, and
- hasn't been needed since Tor 0.3.0.1-alpha. Closes ticket 27286.
- o Minor features (geoip):
- - Update geoip and geoip6 to the August 7 2018 Maxmind GeoLite2
- Country database. Closes ticket 27089.
- o Minor bugfixes (compilation, backport from 0.3.4.6-rc):
- - When compiling with --enable-openbsd-malloc or --enable-tcmalloc,
- tell the compiler not to include the system malloc implementation.
- Fixes bug 20424; bugfix on 0.2.0.20-rc.
- - Don't try to use a pragma to temporarily disable the
- -Wunused-const-variable warning if the compiler doesn't support
- it. Fixes bug 26785; bugfix on 0.3.2.11.
- o Minor bugfixes (compilation, backport from 0.3.4.7-rc):
- - Silence a spurious compiler warning on the GetAdaptersAddresses
- function pointer cast. This issue is already fixed by 26481 in
- 0.3.5 and later, by removing the lookup and cast. Fixes bug 27465;
- bugfix on 0.2.3.11-alpha.
- - Stop calling SetProcessDEPPolicy() on 64-bit Windows. It is not
- supported, and always fails. Some compilers warn about the
- function pointer cast on 64-bit Windows. Fixes bug 27461; bugfix
- on 0.2.2.23-alpha.
- o Minor bugfixes (compilation, windows, backport from 0.3.4.7-rc):
- - Don't link or search for pthreads when building for Windows, even
- if we are using build environment (like mingw) that provides a
- pthreads library. Fixes bug 27081; bugfix on 0.1.0.1-rc.
- o Minor bugfixes (continuous integration, backport from 0.3.4.6-rc):
- - Skip a pair of unreliable key generation tests on Windows, until
- the underlying issue in bug 26076 is resolved. Fixes bug 26830 and
- bug 26853; bugfix on 0.2.7.3-rc and 0.3.2.1-alpha respectively.
- o Minor bugfixes (continuous integration, backport from 0.3.4.7-rc):
- - Build with zstd on macOS. Fixes bug 27090; bugfix on 0.3.1.5-alpha.
- - Pass the module flags to distcheck configure, and log the flags
- before running configure. (Backported to 0.2.9 and later as a
- precaution.) Fixes bug 27088; bugfix on 0.3.4.1-alpha.
- o Minor bugfixes (continuous integration, backport from 0.3.4.8):
- - When a Travis build fails, and showing a log fails, keep trying to
- show the other logs. Fixes bug 27453; bugfix on 0.3.4.7-rc.
- - When we use echo in Travis, don't pass a --flag as the first
- argument. Fixes bug 27418; bugfix on 0.3.4.7-rc.
- o Minor bugfixes (directory authority, backport from 0.3.4.6-rc):
- - When voting for recommended versions, make sure that all of the
- versions are well-formed and parsable. Fixes bug 26485; bugfix
- on 0.1.1.6-alpha.
- o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.4.7-rc):
- - Fix a bug in out sandboxing rules for the openat() syscall.
- Previously, no openat() call would be permitted, which would break
- filesystem operations on recent glibc versions. Fixes bug 25440;
- bugfix on 0.2.9.15. Diagnosis and patch from Daniel Pinto.
- o Minor bugfixes (logging, backport from 0.3.4.6-rc):
- - Improve the log message when connection initiators fail to
- authenticate direct connections to relays. Fixes bug 26927; bugfix
- on 0.3.0.1-alpha.
- o Minor bugfixes (onion services, backport from 0.3.4.7-rc):
- - Fix bug that causes services to not ever rotate their descriptors
- if they were getting SIGHUPed often. Fixes bug 26932; bugfix
- on 0.3.2.1-alpha.
- o Minor bugfixes (onion services, backport from 0.3.4.8):
- - Silence a spurious compiler warning in
- rend_client_send_introduction(). Fixes bug 27463; bugfix
- on 0.1.1.2-alpha.
- o Minor bugfixes (rust, backport from 0.3.4.7-rc):
- - Backport test_rust.sh from master. Fixes bug 26497; bugfix
- on 0.3.1.5-alpha.
- - Consistently use ../../.. as a fallback for $abs_top_srcdir in
- test_rust.sh. Fixes bug 27093; bugfix on 0.3.4.3-alpha.
- - Stop setting $CARGO_HOME. cargo will use the user's $CARGO_HOME, or
- $HOME/.cargo by default. Fixes bug 26497; bugfix on 0.3.1.5-alpha.
- o Minor bugfixes (single onion services, Tor2web, backport from 0.3.4.6-rc):
- - Log a protocol warning when single onion services or Tor2web clients
- fail to authenticate direct connections to relays.
- Fixes bug 26924; bugfix on 0.2.9.1-alpha.
- o Minor bugfixes (testing, backport from 0.3.4.6-rc):
- - Disable core dumps in test_bt.sh, to avoid failures in "make
- distcheck". Fixes bug 26787; bugfix on 0.2.5.2-alpha.
- o Minor bugfixes (testing, chutney, backport from 0.3.4.8):
- - When running make test-network-all, use the mixed+hs-v2 network.
- (A previous fix to chutney removed v3 onion services from the
- mixed+hs-v23 network, so seeing "mixed+hs-v23" in tests is
- confusing.) Fixes bug 27345; bugfix on 0.3.2.1-alpha.
- - Before running make test-network-all, delete old logs and test
- result files, to avoid spurious failures. Fixes bug 27295; bugfix
- on 0.2.7.3-rc.
- o Minor bugfixes (testing, openssl compatibility):
- - Our "tortls/cert_matches_key" unit test no longer relies on OpenSSL
- internals. Previously, it relied on unsupported OpenSSL behavior in
- a way that caused it to crash with OpenSSL 1.0.2p. Fixes bug 27226;
- bugfix on 0.2.5.1-alpha.
- o Minor bugfixes (testing, openssl compatibility, backport from 0.3.4.7-rc):
- - Our "tortls/cert_matches_key" unit test no longer relies on
- OpenSSL internals. Previously, it relied on unsupported OpenSSL
- behavior in a way that caused it to crash with OpenSSL 1.0.2p.
- Fixes bug 27226; bugfix on 0.2.5.1-alpha.
- o Minor bugfixes (Windows, compilation, backport from 0.3.4.7-rc):
- - Silence a compilation warning on MSVC 2017 and clang-cl. Fixes bug
- 27185; bugfix on 0.2.2.2-alpha.
- Changes in version 0.3.3.10 - 2018-09-10
- Tor 0.3.3.10 backports numerous fixes from later versions of Tor.
- o Minor features (bug workaround, backport from 0.3.4.7-rc):
- - Compile correctly on systems that provide the C11 stdatomic.h
- header, but where C11 atomic functions don't actually compile.
- Closes ticket 26779; workaround for Debian issue 903709.
- o Minor features (compatibility, backport from 0.3.4.8):
- - Tell OpenSSL to maintain backward compatibility with previous
- RSA1024/DH1024 users in Tor. With OpenSSL 1.1.1-pre6, these
- ciphers are disabled by default. Closes ticket 27344.
- o Minor features (continuous integration, backport from 0.3.4.7-rc):
- - Backport Travis rust distcheck to 0.3.3. Closes ticket 24629.
- - Enable macOS builds in our Travis CI configuration. Closes
- ticket 24629.
- - Install libcap-dev and libseccomp2-dev so these optional
- dependencies get tested on Travis CI. Closes ticket 26560.
- - Run asciidoc during Travis CI. Implements ticket 27087.
- - Use ccache in our Travis CI configuration. Closes ticket 26952.
- o Minor features (continuous integration, rust, backport from 0.3.4.7-rc):
- - Use cargo cache in our Travis CI configuration. Closes
- ticket 26952.
- o Minor features (controller, backport from 0.3.4.6-rc):
- - The control port now exposes the list of HTTPTunnelPorts and
- ExtOrPorts via GETINFO net/listeners/httptunnel and
- net/listeners/extor respectively. Closes ticket 26647.
- o Minor features (directory authorities, backport from 0.3.4.7-rc):
- - Authorities no longer vote to make the subprotocol version
- "LinkAuth=1" a requirement: it is unsupportable with NSS, and
- hasn't been needed since Tor 0.3.0.1-alpha. Closes ticket 27286.
- o Minor features (geoip):
- - Update geoip and geoip6 to the August 7 2018 Maxmind GeoLite2
- Country database. Closes ticket 27089.
- o Minor bugfixes (compilation, backport from 0.3.4.6-rc):
- - When compiling with --enable-openbsd-malloc or --enable-tcmalloc,
- tell the compiler not to include the system malloc implementation.
- Fixes bug 20424; bugfix on 0.2.0.20-rc.
- - Don't try to use a pragma to temporarily disable the
- -Wunused-const-variable warning if the compiler doesn't support
- it. Fixes bug 26785; bugfix on 0.3.2.11.
- o Minor bugfixes (compilation, backport from 0.3.4.7-rc):
- - Silence a spurious compiler warning on the GetAdaptersAddresses
- function pointer cast. This issue is already fixed by 26481 in
- 0.3.5 and later, by removing the lookup and cast. Fixes bug 27465;
- bugfix on 0.2.3.11-alpha.
- - Stop calling SetProcessDEPPolicy() on 64-bit Windows. It is not
- supported, and always fails. Some compilers warn about the
- function pointer cast on 64-bit Windows. Fixes bug 27461; bugfix
- on 0.2.2.23-alpha.
- o Minor bugfixes (compilation, windows, backport from 0.3.4.7-rc):
- - Don't link or search for pthreads when building for Windows, even
- if we are using build environment (like mingw) that provides a
- pthreads library. Fixes bug 27081; bugfix on 0.1.0.1-rc.
- o Minor bugfixes (continuous integration, backport from 0.3.4.6-rc):
- - Skip a pair of unreliable key generation tests on Windows, until
- the underlying issue in bug 26076 is resolved. Fixes bug 26830 and
- bug 26853; bugfix on 0.2.7.3-rc and 0.3.2.1-alpha respectively.
- o Minor bugfixes (continuous integration, backport from 0.3.4.7-rc):
- - Build with zstd on macOS. Fixes bug 27090; bugfix on 0.3.1.5-alpha.
- - Pass the module flags to distcheck configure, and log the flags
- before running configure. (Backported to 0.2.9 and later as a
- precaution.) Fixes bug 27088; bugfix on 0.3.4.1-alpha.
- o Minor bugfixes (continuous integration, backport from 0.3.4.8):
- - When a Travis build fails, and showing a log fails, keep trying to
- show the other logs. Fixes bug 27453; bugfix on 0.3.4.7-rc.
- - When we use echo in Travis, don't pass a --flag as the first
- argument. Fixes bug 27418; bugfix on 0.3.4.7-rc.
- o Minor bugfixes (directory authority, backport from 0.3.4.6-rc):
- - When voting for recommended versions, make sure that all of the
- versions are well-formed and parsable. Fixes bug 26485; bugfix
- on 0.1.1.6-alpha.
- o Minor bugfixes (in-process restart, backport from 0.3.4.7-rc):
- - Always call tor_free_all() when leaving tor_run_main(). When we
- did not, restarting tor in-process would cause an assertion
- failure. Fixes bug 26948; bugfix on 0.3.3.1-alpha.
- o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.4.7-rc):
- - Fix a bug in our sandboxing rules for the openat() syscall.
- Previously, no openat() call would be permitted, which would break
- filesystem operations on recent glibc versions. Fixes bug 25440;
- bugfix on 0.2.9.15. Diagnosis and patch from Daniel Pinto.
- o Minor bugfixes (logging, backport from 0.3.4.6-rc):
- - Improve the log message when connection initiators fail to
- authenticate direct connections to relays. Fixes bug 26927; bugfix
- on 0.3.0.1-alpha.
- o Minor bugfixes (onion services, backport from 0.3.4.7-rc):
- - Fix bug that causes services to not ever rotate their descriptors
- if they were getting SIGHUPed often. Fixes bug 26932; bugfix
- on 0.3.2.1-alpha.
- o Minor bugfixes (onion services, backport from 0.3.4.8):
- - Silence a spurious compiler warning in
- rend_client_send_introduction(). Fixes bug 27463; bugfix
- on 0.1.1.2-alpha.
- o Minor bugfixes (portability, backport from 0.3.4.6-rc):
- - Work around two different bugs in the OS X 10.10 and later SDKs
- that would prevent us from successfully targeting earlier versions
- of OS X. Fixes bug 26876; bugfix on 0.3.3.1-alpha.
- o Minor bugfixes (portability, backport from 0.3.4.7-rc):
- - Fix compilation of the unit tests on GNU/Hurd, which does not
- define PATH_MAX. Fixes bug 26873; bugfix on 0.3.3.1-alpha. Patch
- from "paulusASol".
- o Minor bugfixes (rust, backport from 0.3.4.7-rc):
- - Backport test_rust.sh from master. Fixes bug 26497; bugfix
- on 0.3.1.5-alpha.
- - Consistently use ../../.. as a fallback for $abs_top_srcdir in
- test_rust.sh. Fixes bug 27093; bugfix on 0.3.4.3-alpha.
- - Protover parsing was accepting the presence of whitespace in
- version strings, which the C implementation would choke on, e.g.
- "Desc=1\t,2". Fixes bug 27177; bugfix on 0.3.3.5-rc.
- - Protover parsing was ignoring a 2nd hyphen and everything after
- it, accepting entries like "Link=1-5-foo". Fixes bug 27164; bugfix
- on 0.3.3.1-alpha.
- - Stop setting $CARGO_HOME. cargo will use the user's $CARGO_HOME, or
- $HOME/.cargo by default. Fixes bug 26497; bugfix on 0.3.1.5-alpha.
- - cd to ${abs_top_builddir}/src/rust before running cargo in
- src/test/test_rust.sh. This makes the working directory consistent
- between builds and tests. Fixes bug 26497; bugfix on 0.3.3.2-alpha.
- o Minor bugfixes (single onion services, Tor2web, backport from 0.3.4.6-rc):
- - Log a protocol warning when single onion services or Tor2web clients
- fail to authenticate direct connections to relays.
- Fixes bug 26924; bugfix on 0.2.9.1-alpha.
- o Minor bugfixes (testing, backport from 0.3.4.6-rc):
- - Disable core dumps in test_bt.sh, to avoid failures in "make
- distcheck". Fixes bug 26787; bugfix on 0.2.5.2-alpha.
- o Minor bugfixes (testing, chutney, backport from 0.3.4.8):
- - When running make test-network-all, use the mixed+hs-v2 network.
- (A previous fix to chutney removed v3 onion services from the
- mixed+hs-v23 network, so seeing "mixed+hs-v23" in tests is
- confusing.) Fixes bug 27345; bugfix on 0.3.2.1-alpha.
- - Before running make test-network-all, delete old logs and test
- result files, to avoid spurious failures. Fixes bug 27295; bugfix
- on 0.2.7.3-rc.
- o Minor bugfixes (testing, openssl compatibility, backport from 0.3.4.7-rc):
- - Our "tortls/cert_matches_key" unit test no longer relies on
- OpenSSL internals. Previously, it relied on unsupported OpenSSL
- behavior in a way that caused it to crash with OpenSSL 1.0.2p.
- Fixes bug 27226; bugfix on 0.2.5.1-alpha.
- o Minor bugfixes (v3 onion services, backport from 0.3.4.6-rc):
- - Stop sending ed25519 link specifiers in v3 onion service introduce
- cells and descriptors, when the rendezvous or introduction point
- doesn't support ed25519 link authentication. Fixes bug 26627;
- bugfix on 0.3.2.4-alpha.
- o Minor bugfixes (Windows, compilation, backport from 0.3.4.7-rc):
- - Silence a compilation warning on MSVC 2017 and clang-cl. Fixes bug
- 27185; bugfix on 0.2.2.2-alpha.
- Changes in version 0.3.4.8 - 2018-09-10
- Tor 0.3.4.8 is the first stable release in its series; it includes
- compilation and portability fixes.
- The Tor 0.3.4 series includes improvements for running Tor in
- low-power and embedded environments, which should help performance in
- general. We've begun work on better modularity, and included preliminary
- changes on the directory authority side to accommodate a new bandwidth
- measurement system. We've also integrated more continuous-integration
- systems into our development process, and made corresponding changes to
- Tor's testing infrastructure. Finally, we've continued to refine
- our anti-denial-of-service code.
- Below are the changes since 0.3.3.9. For a list of only the changes
- since 0.3.4.7-rc, see the ChangeLog file.
- o New system requirements:
- - Tor no longer tries to support old operating systems without
- mmap() or some local equivalent. Apparently, compilation on such
- systems has been broken for some time, without anybody noticing or
- complaining. Closes ticket 25398.
- o Major features (directory authority, modularization):
- - The directory authority subsystem has been modularized. The code
- is now located in src/or/dirauth/, and is compiled in by default.
- To disable the module, the configure option
- --disable-module-dirauth has been added. This module may be
- disabled by default in some future release. Closes ticket 25610.
- o Major features (main loop, CPU usage):
- - When Tor is disabled (via DisableNetwork or via hibernation), it
- no longer needs to run any per-second events. This change should
- make it easier for mobile applications to disable Tor while the
- device is sleeping, or Tor is not running. Closes ticket 26063.
- - Tor no longer enables all of its periodic events by default.
- Previously, Tor would enable all possible main loop events,
- regardless of whether it needed them. Furthermore, many of these
- events are now disabled when Tor is hibernating or DisableNetwork
- is set. This is a big step towards reducing client CPU usage by
- reducing the amount of wake-ups the daemon does. Closes tickets
- 25376 and 25762.
- - The bandwidth-limitation logic has been refactored so that
- bandwidth calculations are performed on-demand, rather than every
- TokenBucketRefillInterval milliseconds. This change should improve
- the granularity of our bandwidth calculations, and limit the
- number of times that the Tor process needs to wake up when it is
- idle. Closes ticket 25373.
- - Move responsibility for many operations from a once-per-second
- callback to a callback that is only scheduled as needed. Moving
- this functionality has allowed us to disable the callback when
- Tor's network is disabled. Once enough items are removed from our
- once-per-second callback, we can eliminate it entirely to conserve
- CPU when idle. The functionality removed includes: closing
- connections, circuits, and channels (ticket 25932); consensus
- voting (25937); flushing log callbacks (25951); honoring delayed
- SIGNEWNYM requests (25949); rescanning the consensus cache
- (25931); saving the state file to disk (25948); warning relay
- operators about unreachable ports (25952); and keeping track of
- Tor's uptime (26009).
- o Minor features (accounting):
- - When Tor becomes dormant, it now uses a scheduled event to wake up
- at the right time. Previously, we would use the per-second timer
- to check whether to wake up, but we no longer have any per-second
- timers enabled when the network is disabled. Closes ticket 26064.
- o Minor features (bug workaround):
- - Compile correctly on systems that provide the C11 stdatomic.h
- header, but where C11 atomic functions don't actually compile.
- Closes ticket 26779; workaround for Debian issue 903709.
- o Minor features (code quality):
- - Add optional spell-checking for the Tor codebase, using the
- "misspell" program. To use this feature, run "make check-typos".
- Closes ticket 25024.
- o Minor features (compatibility):
- - Tell OpenSSL to maintain backward compatibility with previous
- RSA1024/DH1024 users in Tor. With OpenSSL 1.1.1-pre6, these
- ciphers are disabled by default. Closes ticket 27344.
- - Tor now detects versions of OpenSSL 1.1.0 and later compiled with
- the no-deprecated option, and builds correctly with them. Closes
- tickets 19429, 19981, and 25353.
- o Minor features (compilation):
- - When compiling with --enable-openbsd-malloc or --enable-tcmalloc,
- tell the compiler not to include the system malloc implementation.
- Fixes bug 20424; bugfix on 0.2.0.20-rc.
- - Don't try to use a pragma to temporarily disable the
- -Wunused-const-variable warning if the compiler doesn't support
- it. Fixes bug 26785; bugfix on 0.3.2.11.
- - When building Tor, prefer to use Python 3 over Python 2, and more
- recent (contemplated) versions over older ones. Closes
- ticket 26372.
- o Minor features (compression, zstd):
- - When running with zstd, Tor now considers using advanced functions
- that the zstd maintainers have labeled as potentially unstable. To
- prevent breakage, Tor will only use this functionality when the
- runtime version of the zstd library matches the version with which
- Tor was compiled. Closes ticket 25162.
- o Minor features (configuration):
- - The "DownloadSchedule" options have been renamed to end with
- "DownloadInitialDelay". The old names are still allowed, but will
- produce a warning. Comma-separated lists are still permitted for
- these options, but all values after the first are ignored (as they
- have been since 0.2.9). Closes ticket 23354.
- o Minor features (continuous integration):
- - Log the compiler path and version during Appveyor builds.
- Implements ticket 27449.
- - Show config.log and test-suite.log after failed Appveyor builds.
- Also upload the zipped full logs as a build artifact. Implements
- ticket 27430.
- - Backport Travis rust distcheck to 0.3.3. Closes ticket 24629.
- - Enable macOS builds in our Travis CI configuration. Closes
- ticket 24629.
- - Install libcap-dev and libseccomp2-dev so these optional
- dependencies get tested on Travis CI. Closes ticket 26560.
- - Only post Appveyor IRC notifications when the build fails.
- Implements ticket 27275.
- - Run asciidoc during Travis CI. Implements ticket 27087.
- - Use ccache in our Travis CI configuration. Closes ticket 26952.
- - Add the necessary configuration files for continuous integration
- testing on Windows, via the Appveyor platform. Closes ticket
- 25549. Patches from Marcin Cieślak and Isis Lovecruft.
- o Minor features (continuous integration, rust):
- - Use cargo cache in our Travis CI configuration. Closes
- ticket 26952.
- o Minor features (control port):
- - Introduce GETINFO "current-time/{local,utc}" to return the local
- and UTC times respectively in ISO format. This helps a controller
- like Tor Browser detect a time-related error. Closes ticket 25511.
- Patch by Neel Chauhan.
- - Introduce new fields to the CIRC_BW event. There are two new
- fields in each of the read and written directions. The DELIVERED
- fields report the total valid data on the circuit, as measured by
- the payload sizes of verified and error-checked relay command
- cells. The OVERHEAD fields report the total unused bytes in each
- of these cells. Closes ticket 25903.
- o Minor features (controller):
- - The control port now exposes the list of HTTPTunnelPorts and
- ExtOrPorts via GETINFO net/listeners/httptunnel and
- net/listeners/extor respectively. Closes ticket 26647.
- o Minor features (directory authorities):
- - Stop warning about incomplete bw lines before the first complete
- bw line has been found, so that additional header lines can be
- ignored. Fixes bug 25960; bugfix on 0.2.2.1-alpha
- - Authorities no longer vote to make the subprotocol version
- "LinkAuth=1" a requirement: it is unsupportable with NSS, and
- hasn't been needed since Tor 0.3.0.1-alpha. Closes ticket 27286.
- o Minor features (directory authority):
- - Directory authorities now open their key-pinning files as O_SYNC,
- to limit their chances of accidentally writing partial lines.
- Closes ticket 23909.
- o Minor features (directory authority, forward compatibility):
- - Make the lines of the measured bandwidth file able to contain
- their entries in any order. Previously, the node_id entry needed
- to come first. Closes ticket 26004.
- o Minor features (entry guards):
- - Introduce a new torrc option NumPrimaryGuards for controlling the
- number of primary guards. Closes ticket 25843.
- o Minor features (geoip):
- - Update geoip and geoip6 to the August 7 2018 Maxmind GeoLite2
- Country database. Closes ticket 27089.
- o Minor features (performance):
- - Avoid a needless call to malloc() when processing an incoming
- relay cell. Closes ticket 24914.
- - Make our timing-wheel code run a tiny bit faster on 32-bit
- platforms, by preferring 32-bit math to 64-bit. Closes
- ticket 24688.
- - Avoid a needless malloc()/free() pair every time we handle an ntor
- handshake. Closes ticket 25150.
- o Minor features (Rust, portability):
- - Rust cross-compilation is now supported. Closes ticket 25895.
- o Minor features (testing):
- - Add a unit test for voting_schedule_get_start_of_next_interval().
- Closes ticket 26014, and helps make unit test coverage
- more deterministic.
- - A new unittests module specifically for testing the functions in
- the (new-ish) bridges.c module has been created with new
- unittests, raising the code coverage percentages. Closes 25425.
- - We now have improved testing for addressmap_get_virtual_address()
- function. This should improve our test coverage, and make our test
- coverage more deterministic. Closes ticket 25993.
- o Minor features (timekeeping, circuit scheduling):
- - When keeping track of how busy each circuit have been recently on
- a given connection, use coarse-grained monotonic timers rather
- than gettimeofday(). This change should marginally increase
- accuracy and performance. Implements part of ticket 25927.
- o Minor features (unit tests):
- - Test complete bandwidth measurements files, and test that
- incomplete bandwidth lines only give warnings when the end of the
- header has not been detected. Fixes bug 25947; bugfix
- on 0.2.2.1-alpha
- o Minor bugfixes (bandwidth management):
- - Consider ourselves "low on write bandwidth" if we have exhausted
- our write bandwidth some time in the last second. This was the
- documented behavior before, but the actual behavior was to change
- this value every TokenBucketRefillInterval. Fixes bug 25828;
- bugfix on 0.2.3.5-alpha.
- o Minor bugfixes (C correctness):
- - Add a missing lock acquisition in the shutdown code of the control
- subsystem. Fixes bug 25675; bugfix on 0.2.7.3-rc. Found by
- Coverity; this is CID 1433643.
- o Minor bugfixes (code style):
- - Fixed multiple includes of transports.h in src/or/connection.c
- Fixes bug 25261; bugfix on 0.2.5.1-alpha.
- - Remove the unused variable n_possible from the function
- channel_get_for_extend(). Fixes bug 25645; bugfix on 0.2.4.4-alpha
- o Minor bugfixes (compilation):
- - Silence a spurious compiler warning on the GetAdaptersAddresses
- function pointer cast. This issue is already fixed by 26481 in
- 0.3.5 and later, by removing the lookup and cast. Fixes bug 27465;
- bugfix on 0.2.3.11-alpha.
- - Stop calling SetProcessDEPPolicy() on 64-bit Windows. It is not
- supported, and always fails. Some compilers warn about the
- function pointer cast on 64-bit Windows. Fixes bug 27461; bugfix
- on 0.2.2.23-alpha.
- - Fix a compilation warning on some versions of GCC when building
- code that calls routerinfo_get_my_routerinfo() twice, assuming
- that the second call will succeed if the first one did. Fixes bug
- 26269; bugfix on 0.2.8.2-alpha.
- - Refrain from compiling unit testing related object files when
- --disable-unittests is set to configure script. Fixes bug 24891;
- bugfix on 0.2.5.1-alpha.
- - The --enable-fatal-warnings flag now affects Rust code as well.
- Closes ticket 26245.
- - Avoid a compiler warning when casting the return value of
- smartlist_len() to double with DEBUG_SMARTLIST enabled. Fixes bug
- 26283; bugfix on 0.2.4.10-alpha.
- o Minor bugfixes (compilation, windows):
- - Don't link or search for pthreads when building for Windows, even
- if we are using build environment (like mingw) that provides a
- pthreads library. Fixes bug 27081; bugfix on 0.1.0.1-rc.
- o Minor bugfixes (continuous integration):
- - Build with zstd on macOS. Fixes bug 27090; bugfix on 0.3.1.5-alpha.
- - Skip a pair of unreliable key generation tests on Windows, until
- the underlying issue in bug 26076 is resolved. Fixes bug 26830 and
- bug 26853; bugfix on 0.2.7.3-rc and 0.3.2.1-alpha respectively.
- o Minor bugfixes (control port):
- - Respond with more human-readable error messages to GETINFO exit-
- policy/* requests. Also, let controller know if an error is
- transient (response code 551) or not (response code 552). Fixes
- bug 25852; bugfix on 0.2.8.1-alpha.
- - Parse the "HSADDRESS=" parameter in HSPOST commands properly.
- Previously, it was misparsed and ignored. Fixes bug 26523; bugfix
- on 0.3.3.1-alpha. Patch by "akwizgran".
- - Make CIRC_BW event reflect the total of all data sent on a
- circuit, including padding and dropped cells. Also fix a mis-
- counting bug when STREAM_BW events were enabled. Fixes bug 25400;
- bugfix on 0.2.5.2-alpha.
- o Minor bugfixes (correctness, flow control):
- - Upon receiving a stream-level SENDME cell, verify that our window
- has not grown too large. Fixes bug 26214; bugfix on svn
- r54 (pre-0.0.1).
- o Minor bugfixes (directory authority):
- - When voting for recommended versions, make sure that all of the
- versions are well-formed and parsable. Fixes bug 26485; bugfix
- on 0.1.1.6-alpha.
- o Minor bugfixes (directory client):
- - When unverified-consensus is verified, rename it to cached-
- consenus. Fixes bug 4187; bugfix on 0.2.0.3-alpha.
- - Fixed launching a certificate fetch always during the scheduled
- periodic consensus fetch by fetching only in those cases when
- consensus are waiting for certs. Fixes bug 24740; bugfix
- on 0.2.9.1-alpha.
- o Minor bugfixes (error reporting):
- - Improve tolerance for directory authorities with skewed clocks.
- Previously, an authority with a clock more than 60 seconds ahead
- could cause a client with a correct clock to warn that the
- client's clock was behind. Now the clocks of a majority of
- directory authorities have to be ahead of the client before this
- warning will occur. Fixes bug 25756; bugfix on 0.2.2.25-alpha.
- o Minor bugfixes (in-process restart):
- - Always call tor_free_all() when leaving tor_run_main(). When we
- did not, restarting tor in-process would cause an assertion
- failure. Fixes bug 26948; bugfix on 0.3.3.1-alpha.
- o Minor bugfixes (Linux seccomp2 sandbox):
- - Fix a bug in our sandboxing rules for the openat() syscall.
- Previously, no openat() call would be permitted, which would break
- filesystem operations on recent glibc versions. Fixes bug 25440;
- bugfix on 0.2.9.15. Diagnosis and patch from Daniel Pinto.
- o Minor bugfixes (logging):
- - Improve the log message when connection initiators fail to
- authenticate direct connections to relays. Fixes bug 26927; bugfix
- on 0.3.0.1-alpha.
- o Minor bugfixes (onion services):
- - Silence a spurious compiler warning in
- rend_client_send_introduction(). Fixes bug 27463; bugfix
- on 0.1.1.2-alpha.
- - Fix bug that causes services to not ever rotate their descriptors
- if they were getting SIGHUPed often. Fixes bug 26932; bugfix
- on 0.3.2.1-alpha.
- - Recompute some consensus information after detecting a clock jump,
- or after transitioning from a non-live consensus to a live
- consensus. We do this to avoid having an outdated state, and
- miscalculating the index for next-generation onion services. Fixes
- bug 24977; bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (portability):
- - Fix compilation of the unit tests on GNU/Hurd, which does not
- define PATH_MAX. Fixes bug 26873; bugfix on 0.3.3.1-alpha. Patch
- from "paulusASol".
- - Work around two different bugs in the OS X 10.10 and later SDKs
- that would prevent us from successfully targeting earlier versions
- of OS X. Fixes bug 26876; bugfix on 0.3.3.1-alpha.
- - Do not align mmap length, as it is not required by POSIX, and the
- getpagesize function is deprecated. Fixes bug 25399; bugfix
- on 0.1.1.23.
- o Minor bugfixes (portability, FreeBSD):
- - In have_enough_mem_for_dircache(), the variable DIRCACHE_MIN_MEM_MB
- does not stringify on FreeBSD, so we switch to tor_asprintf().
- Fixes bug 20887; bugfix on 0.2.8.1-alpha. Patch by Neel Chauhan.
- o Minor bugfixes (relay statistics):
- - When a relay is collecting internal statistics about how many
- create cell requests it has seen of each type, accurately count
- the requests from relays that temporarily fall out of the
- consensus. (To be extra conservative, we were already ignoring
- requests from clients in our counts, and we continue ignoring them
- here.) Fixes bug 24910; bugfix on 0.2.4.17-rc.
- o Minor bugfixes (rust):
- - Backport test_rust.sh from master. Fixes bug 26497; bugfix
- on 0.3.1.5-alpha.
- - Protover parsing was accepting the presence of whitespace in
- version strings, which the C implementation would choke on, e.g.
- "Desc=1\t,2". Fixes bug 27177; bugfix on 0.3.3.5-rc.
- - Protover parsing was ignoring a 2nd hyphen and everything after
- it, accepting entries like "Link=1-5-foo". Fixes bug 27164; bugfix
- on 0.3.3.1-alpha.
- - Stop setting $CARGO_HOME. cargo will use the user's $CARGO_HOME, or
- $HOME/.cargo by default. Fixes bug 26497; bugfix on 0.3.1.5-alpha.
- - cd to ${abs_top_builddir}/src/rust before running cargo in
- src/test/test_rust.sh. This makes the working directory consistent
- between builds and tests. Fixes bug 26497; bugfix on 0.3.3.2-alpha.
- o Minor bugfixes (single onion services, Tor2web):
- - Log a protocol warning when single onion services or Tor2web
- clients fail to authenticate direct connections to relays. Fixes
- bug 26924; bugfix on 0.2.9.1-alpha.
- o Minor bugfixes (test coverage tools):
- - Update our "cov-diff" script to handle output from the latest
- version of gcov, and to remove extraneous timestamp information
- from its output. Fixes bugs 26101 and 26102; bugfix
- on 0.2.5.1-alpha.
- o Minor bugfixes (testing):
- - Disable core dumps in test_bt.sh, to avoid failures in "make
- distcheck". Fixes bug 26787; bugfix on 0.2.5.2-alpha.
- - When testing workqueue event-cancellation, make sure that we
- actually cancel an event, and that cancel each event with equal
- probability. (It was previously possible, though extremely
- unlikely, for our event-canceling test not to cancel any events.)
- Fixes bug 26008; bugfix on 0.2.6.3-alpha.
- - Repeat part of the test in test_client_pick_intro() a number of
- times, to give it consistent coverage. Fixes bug 25996; bugfix
- on 0.3.2.1-alpha.
- - Remove randomness from the hs_common/responsible_hsdirs test, so
- that it always takes the same path through the function it tests.
- Fixes bug 25997; bugfix on 0.3.2.1-alpha.
- - Change the behavior of the "channel/outbound" test so that it
- never causes a 10-second rollover for the EWMA circuitmux code.
- Previously, this behavior would happen randomly, and result in
- fluctuating test coverage. Fixes bug 25994; bugfix
- on 0.3.3.1-alpha.
- - Use X509_new() to allocate certificates that will be freed later
- with X509_free(). Previously, some parts of the unit tests had
- used tor_malloc_zero(), which is incorrect, and which caused test
- failures on Windows when they were built with extra hardening.
- Fixes bugs 25943 and 25944; bugfix on 0.2.8.1-alpha. Patch by
- Marcin Cieślak.
- - While running the circuit_timeout test, fix the PRNG to a
- deterministic AES stream, so that the test coverage from this test
- will itself be deterministic. Fixes bug 25995; bugfix
- on 0.2.2.2-alpha.
- o Minor bugfixes (testing, bootstrap):
- - When calculating bootstrap progress, check exit policies and the
- exit flag. Previously, Tor would only check the exit flag, which
- caused race conditions in small and fast networks like chutney.
- Fixes bug 27236; bugfix on 0.2.6.3-alpha.
- o Minor bugfixes (testing, chutney):
- - When running make test-network-all, use the mixed+hs-v2 network.
- (A previous fix to chutney removed v3 onion services from the
- mixed+hs-v23 network, so seeing "mixed+hs-v23" in tests is
- confusing.) Fixes bug 27345; bugfix on 0.3.2.1-alpha.
- - Before running make test-network-all, delete old logs and test
- result files, to avoid spurious failures. Fixes bug 27295; bugfix
- on 0.2.7.3-rc.
- o Minor bugfixes (testing, openssl compatibility):
- - Our "tortls/cert_matches_key" unit test no longer relies on
- OpenSSL internals. Previously, it relied on unsupported OpenSSL
- behavior in a way that caused it to crash with OpenSSL 1.0.2p.
- Fixes bug 27226; bugfix on 0.2.5.1-alpha.
- o Minor bugfixes (v3 onion services):
- - Stop sending ed25519 link specifiers in v3 onion service introduce
- cells and descriptors, when the rendezvous or introduction point
- doesn't support ed25519 link authentication. Fixes bug 26627;
- bugfix on 0.3.2.4-alpha.
- o Minor bugfixes (vanguards):
- - Allow the last hop in a vanguard circuit to be the same as our
- first, to prevent the adversary from influencing guard node choice
- by choice of last hop. Also prevent the creation of A - B - A
- paths, or A - A paths, which are forbidden by relays. Fixes bug
- 25870; bugfix on 0.3.3.1-alpha.
- o Minor bugfixes (Windows, compilation):
- - Silence a compilation warning on MSVC 2017 and clang-cl. Fixes bug
- 27185; bugfix on 0.2.2.2-alpha.
- o Code simplification and refactoring:
- - Remove duplicate code in parse_{c,s}method_line and bootstrap
- their functionalities into a single function. Fixes bug 6236;
- bugfix on 0.2.3.6-alpha.
- - We remove the PortForwarding and PortForwardingHelper options,
- related functions, and the port_forwarding tests. These options
- were used by the now-deprecated Vidalia to help ordinary users
- become Tor relays or bridges. Closes ticket 25409. Patch by
- Neel Chauhan.
- - In order to make the OR and dir checking function in router.c less
- confusing we renamed some functions and
- consider_testing_reachability() has been split into
- router_should_check_reachability() and
- router_do_reachability_checks(). Also we improved the documentation
- in some functions. Closes ticket 18918.
- - Initial work to isolate Libevent usage to a handful of modules in
- our codebase, to simplify our call structure, and so that we can
- more easily change event loops in the future if needed. Closes
- ticket 23750.
- - Introduce a function to call getsockname() and return tor_addr_t,
- to save a little complexity throughout the codebase. Closes
- ticket 18105.
- - Make hsdir_index in node_t a hsdir_index_t rather than a pointer
- as hsdir_index is always present. Also, we move hsdir_index_t into
- or.h. Closes ticket 23094. Patch by Neel Chauhan.
- - Merge functions used for describing nodes and suppress the
- functions that do not allocate memory for the output buffer
- string. NODE_DESC_BUF_LEN constant and format_node_description()
- function cannot be used externally from router.c module anymore.
- Closes ticket 25432. Patch by valentecaio.
- - Our main loop has been simplified so that all important operations
- happen inside events. Previously, some operations had to happen
- outside the event loop, to prevent infinite sequences of event
- activations. Closes ticket 25374.
- - Put a SHA1 public key digest in hs_service_intro_point_t, and use
- it in register_intro_circ() and service_intro_point_new(). This
- prevents the digest from being re-calculated each time. Closes
- ticket 23107. Patch by Neel Chauhan.
- - Refactor token-bucket implementations to use a common backend.
- Closes ticket 25766.
- - Remove extern declaration of stats_n_seconds_working variable from
- main, protecting its accesses with get_uptime() and reset_uptime()
- functions. Closes ticket 25081, patch by “valentecaio”.
- - Remove our previous logic for "cached gettimeofday()" -- our
- coarse monotonic timers are fast enough for this purpose, and far
- less error-prone. Implements part of ticket 25927.
- - Remove the return value for fascist_firewall_choose_address_base(),
- and sister functions such as fascist_firewall_choose_address_node()
- and fascist_firewall_choose_address_rs(). Also, while we're here,
- initialize the ap argument as leaving it uninitialized can pose a
- security hazard. Closes ticket 24734. Patch by Neel Chauhan.
- - Rename two fields of connection_t struct. timestamp_lastwritten is
- renamed to timestamp_last_write_allowed and timestamp_lastread is
- renamed to timestamp_last_read_allowed. Closes ticket 24714, patch
- by "valentecaio".
- - Since Tor requires C99, remove our old workaround code for libc
- implementations where free(NULL) doesn't work. Closes ticket 24484.
- - Use our standard rate-limiting code to deal with excessive
- libevent failures, rather than the hand-rolled logic we had
- before. Closes ticket 26016.
- - We remove the return value of node_get_prim_orport() and
- node_get_prim_dirport(), and introduce node_get_prim_orport() in
- node_ipv6_or_preferred() and node_ipv6_dir_preferred() in order to
- check for a null address. Closes ticket 23873. Patch by
- Neel Chauhan.
- - We switch to should_record_bridge_info() in
- geoip_note_client_seen() and options_need_geoip_info() instead of
- accessing the configuration values directly. Fixes bug 25290;
- bugfix on 0.2.1.6-alpha. Patch by Neel Chauhan.
- o Deprecated features:
- - As we are not recommending 0.2.5 anymore, we require relays that
- once had an ed25519 key associated with their RSA key to always
- have that key, instead of allowing them to drop back to a version
- that didn't support ed25519. This means they need to use a new RSA
- key if they want to downgrade to an older version of tor without
- ed25519. Closes ticket 20522.
- o Removed features:
- - Directory authorities will no longer support voting according to
- any consensus method before consensus method 25. This keeps
- authorities compatible with all authorities running 0.2.9.8 and
- later, and does not break any clients or relays. Implements ticket
- 24378 and proposal 290.
- - The PortForwarding and PortForwardingHelper features have been
- removed. The reasoning is, given that implementations of NAT
- traversal protocols within common consumer grade routers are
- frequently buggy, and that the target audience for a NAT punching
- feature is a perhaps less-technically-inclined relay operator,
- when the helper fails to setup traversal the problems are usually
- deep, ugly, and very router specific, making them horrendously
- impossible for technical support to reliable assist with, and thus
- resulting in frustration all around. Unfortunately, relay
- operators who would like to run relays behind NATs will need to
- become more familiar with the port forwarding configurations on
- their local router. Closes 25409.
- - The TestingEnableTbEmptyEvent option has been removed. It was used
- in testing simulations to measure how often connection buckets
- were emptied, in order to improve our scheduling, but it has not
- been actively used in years. Closes ticket 25760.
- - The old "round-robin" circuit multiplexer (circuitmux)
- implementation has been removed, along with a fairly large set of
- code that existed to support it. It has not been the default
- circuitmux since we introduced the "EWMA" circuitmux in 0.2.4.x,
- but it still required an unreasonable amount of memory and CPU.
- Closes ticket 25268.
- Changes in version 0.3.3.9 - 2018-07-13
- Tor 0.3.3.9 moves to a new bridge authority, meaning people running
- bridge relays should upgrade.
- o Directory authority changes:
- - The "Bifroest" bridge authority has been retired; the new bridge
- authority is "Serge", and it is operated by George from the
- TorBSD project. Closes ticket 26771.
- Changes in version 0.3.2.11 - 2018-07-13
- Tor 0.3.2.11 moves to a new bridge authority, meaning people running
- bridge relays should upgrade. We also take this opportunity to backport
- other minor fixes.
- o Directory authority changes:
- - The "Bifroest" bridge authority has been retired; the new bridge
- authority is "Serge", and it is operated by George from the
- TorBSD project. Closes ticket 26771.
- o Directory authority changes (backport from 0.3.3.7):
- - Add an IPv6 address for the "dannenberg" directory authority.
- Closes ticket 26343.
- o Major bugfixes (directory authorities, backport from 0.3.4.1-alpha):
- - When directory authorities read a zero-byte bandwidth file, they
- would previously log a warning with the contents of an
- uninitialised buffer. They now log a warning about the empty file
- instead. Fixes bug 26007; bugfix on 0.2.2.1-alpha.
- o Major bugfixes (onion service, backport from 0.3.4.1-alpha):
- - Correctly detect when onion services get disabled after HUP. Fixes
- bug 25761; bugfix on 0.3.2.1.
- o Minor features (sandbox, backport from 0.3.3.4-alpha):
- - Explicitly permit the poll() system call when the Linux
- seccomp2-based sandbox is enabled: apparently, some versions of
- libc use poll() when calling getpwnam(). Closes ticket 25313.
- o Minor feature (continuous integration, backport from 0.3.3.5-rc):
- - Update the Travis CI configuration to use the stable Rust channel,
- now that we have decided to require that. Closes ticket 25714.
- o Minor features (continuous integration, backport from 0.3.4.1-alpha):
- - Our .travis.yml configuration now includes support for testing the
- results of "make distcheck". (It's not uncommon for "make check"
- to pass but "make distcheck" to fail.) Closes ticket 25814.
- - Our Travis CI configuration now integrates with the Coveralls
- coverage analysis tool. Closes ticket 25818.
- o Minor features (relay, diagnostic, backport from 0.3.4.3-alpha):
- - Add several checks to detect whether Tor relays are uploading
- their descriptors without specifying why they regenerated them.
- Diagnostic for ticket 25686.
- o Minor features (compilation, backport from 0.3.4.4-rc):
- - When building Tor, prefer to use Python 3 over Python 2, and more
- recent (contemplated) versions over older ones. Closes
- ticket 26372.
- o Minor features (geoip):
- - Update geoip and geoip6 to the July 3 2018 Maxmind GeoLite2
- Country database. Closes ticket 26674.
- o Minor bugfixes (correctness, client, backport from 0.3.4.1-alpha):
- - Upon receiving a malformed connected cell, stop processing the
- cell immediately. Previously we would mark the connection for
- close, but continue processing the cell as if the connection were
- open. Fixes bug 26072; bugfix on 0.2.4.7-alpha.
- o Minor bugfixes (Linux seccomp2 sandbox, backport from 0.3.4.1-alpha):
- - Allow the nanosleep() system call, which glibc uses to implement
- sleep() and usleep(). Fixes bug 24969; bugfix on 0.2.5.1-alpha.
- o Minor bugfixes (testing, compatibility, backport from 0.3.4.4-rc):
- - When running the hs_ntor_ref.py test, make sure only to pass
- strings (rather than "bytes" objects) to the Python subprocess
- module. Python 3 on Windows seems to require this. Fixes bug
- 26535; bugfix on 0.3.1.1-alpha.
- - When running the ntor_ref.py test, make sure only to pass strings
- (rather than "bytes" objects) to the Python subprocess module.
- Python 3 on Windows seems to require this. Fixes bug 26535; bugfix
- on 0.2.5.5-alpha.
- o Minor bugfixes (compatibility, openssl, backport from 0.3.4.2-alpha):
- - Work around a change in OpenSSL 1.1.1 where return values that
- would previously indicate "no password" now indicate an empty
- password. Without this workaround, Tor instances running with
- OpenSSL 1.1.1 would accept descriptors that other Tor instances
- would reject. Fixes bug 26116; bugfix on 0.2.5.16.
- o Minor bugfixes (documentation, backport from 0.3.3.5-rc):
- - Document that the PerConnBW{Rate,Burst} options will fall back to
- their corresponding consensus parameters only if those parameters
- are set. Previously we had claimed that these values would always
- be set in the consensus. Fixes bug 25296; bugfix on 0.2.2.7-alpha.
- o Minor bugfixes (compilation, backport from 0.3.4.4-rc):
- - Fix a compilation warning on some versions of GCC when building
- code that calls routerinfo_get_my_routerinfo() twice, assuming
- that the second call will succeed if the first one did. Fixes bug
- 26269; bugfix on 0.2.8.2-alpha.
- o Minor bugfixes (client, backport from 0.3.4.1-alpha):
- - Don't consider Tor running as a client if the ControlPort is open,
- but no actual client ports are open. Fixes bug 26062; bugfix
- on 0.2.9.4-alpha.
- o Minor bugfixes (hardening, backport from 0.3.4.2-alpha):
- - Prevent a possible out-of-bounds smartlist read in
- protover_compute_vote(). Fixes bug 26196; bugfix on 0.2.9.4-alpha.
- o Minor bugfixes (C correctness, backport from 0.3.3.4-alpha):
- - Fix a very unlikely (impossible, we believe) null pointer
- dereference. Fixes bug 25629; bugfix on 0.2.9.15. Found by
- Coverity; this is CID 1430932.
- o Minor bugfixes (onion service, backport from 0.3.4.1-alpha):
- - Fix a memory leak when a v3 onion service is configured and gets a
- SIGHUP signal. Fixes bug 25901; bugfix on 0.3.2.1-alpha.
- - When parsing the descriptor signature, look for the token plus an
- extra white-space at the end. This is more correct but also will
- allow us to support new fields that might start with "signature".
- Fixes bug 26069; bugfix on 0.3.0.1-alpha.
- o Minor bugfixes (relay, backport from 0.3.4.3-alpha):
- - Relays now correctly block attempts to re-extend to the previous
- relay by Ed25519 identity. Previously they would warn in this
- case, but not actually reject the attempt. Fixes bug 26158; bugfix
- on 0.3.0.1-alpha.
- o Minor bugfixes (relay, crash, backport from 0.3.4.1-alpha):
- - Avoid a crash when running with DirPort set but ORPort turned off.
- Fixes a case of bug 23693; bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (compilation, backport from 0.3.4.2-alpha):
- - Silence unused-const-variable warnings in zstd.h with some GCC
- versions. Fixes bug 26272; bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (testing, backport from 0.3.3.4-alpha):
- - Avoid intermittent test failures due to a test that had relied on
- onion service introduction point creation finishing within 5
- seconds of real clock time. Fixes bug 25450; bugfix
- on 0.3.1.3-alpha.
- o Minor bugfixes (compilation, backport from 0.3.3.4-alpha):
- - Fix a C99 compliance issue in our configuration script that caused
- compilation issues when compiling Tor with certain versions of
- xtools. Fixes bug 25474; bugfix on 0.3.2.5-alpha.
- o Minor bugfixes (memory, correctness, backport from 0.3.4.4-rc):
- - Fix a number of small memory leaks identified by coverity. Fixes
- bug 26467; bugfix on numerous Tor versions.
- o Code simplification and refactoring (backport from 0.3.3.5-rc):
- - Move the list of default directory authorities to its own file.
- Closes ticket 24854. Patch by "beastr0".
- Changes in version 0.2.9.16 - 2018-07-13
- Tor 0.2.9.16 moves to a new bridge authority, meaning people running
- bridge relays should upgrade. We also take this opportunity to backport
- other minor fixes.
- o Directory authority changes:
- - The "Bifroest" bridge authority has been retired; the new bridge
- authority is "Serge", and it is operated by George from the
- TorBSD project. Closes ticket 26771.
- o Directory authority changes (backport from 0.3.3.7):
- - Add an IPv6 address for the "dannenberg" directory authority.
- Closes ticket 26343.
- o Major bugfixes (directory authorities, backport from 0.3.4.1-alpha):
- - When directory authorities read a zero-byte bandwidth file, they
- would previously log a warning with the contents of an
- uninitialised buffer. They now log a warning about the empty file
- instead. Fixes bug 26007; bugfix on 0.2.2.1-alpha.
- o Minor features (sandbox, backport from 0.3.3.4-alpha):
- - Explicitly permit the poll() system call when the Linux
- seccomp2-based sandbox is enabled: apparently, some versions of
- libc use poll() when calling getpwnam(). Closes ticket 25313.
- o Minor features (continuous integration, backport from 0.3.4.1-alpha):
- - Our .travis.yml configuration now includes support for testing the
- results of "make distcheck". (It's not uncommon for "make check"
- to pass but "make distcheck" to fail.) Closes ticket 25814.
- - Our Travis CI configuration now integrates with the Coveralls
- coverage analysis tool. Closes ticket 25818.
- o Minor features (compilation, backport from 0.3.4.4-rc):
- - When building Tor, prefer to use Python 3 over Python 2, and more
- recent (contemplated) versions over older ones. Closes
- ticket 26372.
- o Minor features (geoip):
- - Update geoip and geoip6 to the July 3 2018 Maxmind GeoLite2
- Country database. Closes ticket 26674.
- o Minor bugfixes (correctness, client, backport from 0.3.4.1-alpha):
- - Upon receiving a malformed connected cell, stop processing the
- cell immediately. Previously we would mark the connection for
- close, but continue processing the cell as if the connection were
- open. Fixes bug 26072; bugfix on 0.2.4.7-alpha.
- o Minor bugfixes (Linux seccomp2 sandbox, backport from 0.3.4.1-alpha):
- - Allow the nanosleep() system call, which glibc uses to implement
- sleep() and usleep(). Fixes bug 24969; bugfix on 0.2.5.1-alpha.
- o Minor bugfixes (testing, compatibility, backport from 0.3.4.4-rc):
- - When running the ntor_ref.py test, make sure only to pass strings
- (rather than "bytes" objects) to the Python subprocess module.
- Python 3 on Windows seems to require this. Fixes bug 26535; bugfix
- on 0.2.5.5-alpha.
- o Minor bugfixes (compatibility, openssl, backport from 0.3.4.2-alpha):
- - Work around a change in OpenSSL 1.1.1 where return values that
- would previously indicate "no password" now indicate an empty
- password. Without this workaround, Tor instances running with
- OpenSSL 1.1.1 would accept descriptors that other Tor instances
- would reject. Fixes bug 26116; bugfix on 0.2.5.16.
- o Minor bugfixes (compilation, backport from 0.3.4.4-rc):
- - Fix a compilation warning on some versions of GCC when building
- code that calls routerinfo_get_my_routerinfo() twice, assuming
- that the second call will succeed if the first one did. Fixes bug
- 26269; bugfix on 0.2.8.2-alpha.
- o Minor bugfixes (client, backport from 0.3.4.1-alpha):
- - Don't consider Tor running as a client if the ControlPort is open,
- but no actual client ports are open. Fixes bug 26062; bugfix
- on 0.2.9.4-alpha.
- o Minor bugfixes (hardening, backport from 0.3.4.2-alpha):
- - Prevent a possible out-of-bounds smartlist read in
- protover_compute_vote(). Fixes bug 26196; bugfix on 0.2.9.4-alpha.
- o Minor bugfixes (C correctness, backport from 0.3.3.4-alpha):
- - Fix a very unlikely (impossible, we believe) null pointer
- dereference. Fixes bug 25629; bugfix on 0.2.9.15. Found by
- Coverity; this is CID 1430932.
- o Minor bugfixes (memory, correctness, backport from 0.3.4.4-rc):
- - Fix a number of small memory leaks identified by coverity. Fixes
- bug 26467; bugfix on numerous Tor versions.
- o Code simplification and refactoring (backport from 0.3.3.5-rc):
- - Move the list of default directory authorities to its own file.
- Closes ticket 24854. Patch by "beastr0".
- Changes in version 0.3.3.8 - 2018-07-09
- Tor 0.3.3.8 backports several changes from the 0.3.4.x series, including
- fixes for a memory leak affecting directory authorities.
- o Major bugfixes (directory authority, backport from 0.3.4.3-alpha):
- - Stop leaking memory on directory authorities when planning to
- vote. This bug was crashing authorities by exhausting their
- memory. Fixes bug 26435; bugfix on 0.3.3.6.
- o Major bugfixes (rust, testing, backport from 0.3.4.3-alpha):
- - Make sure that failing tests in Rust will actually cause the build
- to fail: previously, they were ignored. Fixes bug 26258; bugfix
- on 0.3.3.4-alpha.
- o Minor features (compilation, backport from 0.3.4.4-rc):
- - When building Tor, prefer to use Python 3 over Python 2, and more
- recent (contemplated) versions over older ones. Closes
- ticket 26372.
- o Minor features (geoip):
- - Update geoip and geoip6 to the July 3 2018 Maxmind GeoLite2
- Country database. Closes ticket 26674.
- o Minor features (relay, diagnostic, backport from 0.3.4.3-alpha):
- - Add several checks to detect whether Tor relays are uploading
- their descriptors without specifying why they regenerated them.
- Diagnostic for ticket 25686.
- o Minor bugfixes (circuit path selection, backport from 0.3.4.1-alpha):
- - Don't count path selection failures as circuit build failures.
- This change should eliminate cases where Tor blames its guard or
- the network for situations like insufficient microdescriptors
- and/or overly restrictive torrc settings. Fixes bug 25705; bugfix
- on 0.3.3.1-alpha.
- o Minor bugfixes (compilation, backport from 0.3.4.4-rc):
- - Fix a compilation warning on some versions of GCC when building
- code that calls routerinfo_get_my_routerinfo() twice, assuming
- that the second call will succeed if the first one did. Fixes bug
- 26269; bugfix on 0.2.8.2-alpha.
- o Minor bugfixes (control port, backport from 0.3.4.4-rc):
- - Handle the HSADDRESS= argument to the HSPOST command properly.
- (Previously, this argument was misparsed and thus ignored.) Fixes
- bug 26523; bugfix on 0.3.3.1-alpha. Patch by "akwizgran".
- o Minor bugfixes (memory, correctness, backport from 0.3.4.4-rc):
- - Fix a number of small memory leaks identified by coverity. Fixes
- bug 26467; bugfix on numerous Tor versions.
- o Minor bugfixes (relay, backport from 0.3.4.3-alpha):
- - Relays now correctly block attempts to re-extend to the previous
- relay by Ed25519 identity. Previously they would warn in this
- case, but not actually reject the attempt. Fixes bug 26158; bugfix
- on 0.3.0.1-alpha.
- o Minor bugfixes (restart-in-process, backport from 0.3.4.1-alpha):
- - When shutting down, Tor now clears all the flags in the control.c
- module. This should prevent a bug where authentication cookies are
- not generated on restart. Fixes bug 25512; bugfix on 0.3.3.1-alpha.
- o Minor bugfixes (testing, compatibility, backport from 0.3.4.4-rc):
- - When running the hs_ntor_ref.py test, make sure only to pass
- strings (rather than "bytes" objects) to the Python subprocess
- module. Python 3 on Windows seems to require this. Fixes bug
- 26535; bugfix on 0.3.1.1-alpha.
- - When running the ntor_ref.py test, make sure only to pass strings
- (rather than "bytes" objects) to the Python subprocess module.
- Python 3 on Windows seems to require this. Fixes bug 26535; bugfix
- on 0.2.5.5-alpha.
- Changes in version 0.3.3.7 - 2018-06-12
- Tor 0.3.3.7 backports several changes from the 0.3.4.x series, including
- fixes for bugs affecting compatibility and stability.
- o Directory authority changes:
- - Add an IPv6 address for the "dannenberg" directory authority.
- Closes ticket 26343.
- o Minor features (geoip):
- - Update geoip and geoip6 to the June 7 2018 Maxmind GeoLite2
- Country database. Closes ticket 26351.
- o Minor bugfixes (compatibility, openssl, backport from 0.3.4.2-alpha):
- - Work around a change in OpenSSL 1.1.1 where return values that
- would previously indicate "no password" now indicate an empty
- password. Without this workaround, Tor instances running with
- OpenSSL 1.1.1 would accept descriptors that other Tor instances
- would reject. Fixes bug 26116; bugfix on 0.2.5.16.
- o Minor bugfixes (compilation, backport from 0.3.4.2-alpha):
- - Silence unused-const-variable warnings in zstd.h with some GCC
- versions. Fixes bug 26272; bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (controller, backport from 0.3.4.2-alpha):
- - Improve accuracy of the BUILDTIMEOUT_SET control port event's
- TIMEOUT_RATE and CLOSE_RATE fields. (We were previously
- miscounting the total number of circuits for these field values.)
- Fixes bug 26121; bugfix on 0.3.3.1-alpha.
- o Minor bugfixes (hardening, backport from 0.3.4.2-alpha):
- - Prevent a possible out-of-bounds smartlist read in
- protover_compute_vote(). Fixes bug 26196; bugfix on 0.2.9.4-alpha.
- o Minor bugfixes (path selection, backport from 0.3.4.1-alpha):
- - Only select relays when they have the descriptors we prefer to use
- for them. This change fixes a bug where we could select a relay
- because it had _some_ descriptor, but reject it later with a
- nonfatal assertion error because it didn't have the exact one we
- wanted. Fixes bugs 25691 and 25692; bugfix on 0.3.3.4-alpha.
- Changes in version 0.3.3.6 - 2018-05-22
- Tor 0.3.3.6 is the first stable release in the 0.3.3 series. It
- backports several important fixes from the 0.3.4.1-alpha.
- The Tor 0.3.3 series includes controller support and other
- improvements for v3 onion services, official support for embedding Tor
- within other applications, and our first non-trivial module written in
- the Rust programming language. (Rust is still not enabled by default
- when building Tor.) And as usual, there are numerous other smaller
- bugfixes, features, and improvements.
- Below are the changes since 0.3.2.10. For a list of only the changes
- since 0.3.3.5-rc, see the ChangeLog file.
- o New system requirements:
- - When built with Rust, Tor now depends on version 0.2.39 of the
- libc crate. Closes tickets 25310 and 25664.
- o Major features (embedding):
- - There is now a documented stable API for programs that need to
- embed Tor. See tor_api.h for full documentation and known bugs.
- Closes ticket 23684.
- - Tor now has support for restarting in the same process.
- Controllers that run Tor using the "tor_api.h" interface can now
- restart Tor after Tor has exited. This support is incomplete,
- however: we fixed crash bugs that prevented it from working at
- all, but many bugs probably remain, including a possibility of
- security issues. Implements ticket 24581.
- o Major features (IPv6, directory documents):
- - Add consensus method 27, which adds IPv6 ORPorts to the microdesc
- consensus. This information makes it easier for IPv6 clients to
- bootstrap and choose reachable entry guards. Implements
- ticket 23826.
- - Add consensus method 28, which removes IPv6 ORPorts from
- microdescriptors. Now that the consensus contains IPv6 ORPorts,
- they are redundant in microdescs. This change will be used by Tor
- clients on 0.2.8.x and later. (That is to say, with all Tor
- clients that have IPv6 bootstrap and guard support.) Implements
- ticket 23828.
- - Expand the documentation for AuthDirHasIPv6Connectivity when it is
- set by different numbers of authorities. Fixes 23870
- on 0.2.4.1-alpha.
- o Major features (onion service v3, control port):
- - The control port now supports commands and events for v3 onion
- services. It is now possible to create ephemeral v3 services using
- ADD_ONION. Additionally, several events (HS_DESC, HS_DESC_CONTENT,
- CIRC and CIRC_MINOR) and commands (GETINFO, HSPOST, ADD_ONION and
- DEL_ONION) have been extended to support v3 onion services. Closes
- ticket 20699; implements proposal 284.
- o Major features (onion services):
- - Provide torrc options to pin the second and third hops of onion
- service circuits to a list of nodes. The option HSLayer2Guards
- pins the second hop, and the option HSLayer3Guards pins the third
- hop. These options are for use in conjunction with experiments
- with "vanguards" for preventing guard enumeration attacks. Closes
- ticket 13837.
- - When v3 onion service clients send introduce cells, they now
- include the IPv6 address of the rendezvous point, if it has one.
- Current v3 onion services running 0.3.2 ignore IPv6 addresses, but
- in future Tor versions, IPv6-only v3 single onion services will be
- able to use IPv6 addresses to connect directly to the rendezvous
- point. Closes ticket 23577. Patch by Neel Chauhan.
- o Major features (relay):
- - Implement an option, ReducedExitPolicy, to allow an Tor exit relay
- operator to use a more reasonable ("reduced") exit policy, rather
- than the default one. If you want to run an exit node without
- thinking too hard about which ports to allow, this one is for you.
- Closes ticket 13605. Patch from Neel Chauhan.
- o Major features (rust, portability, experimental):
- - Tor now ships with an optional implementation of one of its
- smaller modules (protover.c) in the Rust programming language. To
- try it out, install a Rust build environment, and configure Tor
- with "--enable-rust --enable-cargo-online-mode". This should not
- cause any user-visible changes, but should help us gain more
- experience with Rust, and plan future Rust integration work.
- Implementation by Chelsea Komlo. Closes ticket 22840.
- o Major bugfixes (directory authorities, security, backport from 0.3.4.1-alpha):
- - When directory authorities read a zero-byte bandwidth file, they
- would previously log a warning with the contents of an
- uninitialised buffer. They now log a warning about the empty file
- instead. Fixes bug 26007; bugfix on 0.2.2.1-alpha.
- o Major bugfixes (security, directory authority, denial-of-service):
- - Fix a bug that could have allowed an attacker to force a directory
- authority to use up all its RAM by passing it a maliciously
- crafted protocol versions string. Fixes bug 25517; bugfix on
- 0.2.9.4-alpha. This issue is also tracked as TROVE-2018-005.
- o Major bugfixes (crash, backport from 0.3.4.1-alpha):
- - Avoid a rare assertion failure in the circuit build timeout code
- if we fail to allow any circuits to actually complete. Fixes bug
- 25733; bugfix on 0.2.2.2-alpha.
- o Major bugfixes (netflow padding):
- - Stop adding unneeded channel padding right after we finish
- flushing to a connection that has been trying to flush for many
- seconds. Instead, treat all partial or complete flushes as
- activity on the channel, which will defer the time until we need
- to add padding. This fix should resolve confusing and scary log
- messages like "Channel padding timeout scheduled 221453ms in the
- past." Fixes bug 22212; bugfix on 0.3.1.1-alpha.
- o Major bugfixes (networking):
- - Tor will no longer reject IPv6 address strings from Tor Browser
- when they are passed as hostnames in SOCKS5 requests. Fixes bug
- 25036, bugfix on Tor 0.3.1.2.
- o Major bugfixes (onion service, backport from 0.3.4.1-alpha):
- - Correctly detect when onion services get disabled after HUP. Fixes
- bug 25761; bugfix on 0.3.2.1.
- o Major bugfixes (performance, load balancing):
- - Directory authorities no longer vote in favor of the Guard flag
- for relays without directory support. Starting in Tor
- 0.3.0.1-alpha, clients have been avoiding using such relays in the
- Guard position, leading to increasingly broken load balancing for
- the 5%-or-so of Guards that don't advertise directory support.
- Fixes bug 22310; bugfix on 0.3.0.6.
- o Major bugfixes (relay):
- - If we have failed to connect to a relay and received a connection
- refused, timeout, or similar error (at the TCP level), do not try
- that same address/port again for 60 seconds after the failure has
- occurred. Fixes bug 24767; bugfix on 0.0.6.
- o Major bugfixes (relay, denial of service, backport from 0.3.4.1-alpha):
- - Impose a limit on circuit cell queue size. The limit can be
- controlled by a consensus parameter. Fixes bug 25226; bugfix
- on 0.2.4.14-alpha.
- o Minor features (cleanup):
- - Tor now deletes the CookieAuthFile and ExtORPortCookieAuthFile
- when it stops. Closes ticket 23271.
- o Minor features (compatibility, backport from 0.3.4.1-alpha):
- - Avoid some compilation warnings with recent versions of LibreSSL.
- Closes ticket 26006.
- o Minor features (config options):
- - Change the way the default value for MaxMemInQueues is calculated.
- We now use 40% of the hardware RAM if the system has 8 GB RAM or
- more. Otherwise we use the former value of 75%. Closes
- ticket 24782.
- o Minor features (continuous integration):
- - Update the Travis CI configuration to use the stable Rust channel,
- now that we have decided to require that. Closes ticket 25714.
- o Minor features (continuous integration, backport from 0.3.4.1-alpha):
- - Our .travis.yml configuration now includes support for testing the
- results of "make distcheck". (It's not uncommon for "make check"
- to pass but "make distcheck" to fail.) Closes ticket 25814.
- - Our Travis CI configuration now integrates with the Coveralls
- coverage analysis tool. Closes ticket 25818.
- o Minor features (defensive programming):
- - Most of the functions in Tor that free objects have been replaced
- with macros that free the objects and set the corresponding
- pointers to NULL. This change should help prevent a large class of
- dangling pointer bugs. Closes ticket 24337.
- - Where possible, the tor_free() macro now only evaluates its input
- once. Part of ticket 24337.
- - Check that microdesc ed25519 ids are non-zero in
- node_get_ed25519_id() before returning them. Implements ticket
- 24001, patch by "aruna1234".
- o Minor features (directory authority):
- - When directory authorities are unable to add signatures to a
- pending consensus, log the reason why. Closes ticket 24849.
- o Minor features (embedding):
- - Tor can now start with a preauthenticated control connection
- created by the process that launched it. This feature is meant for
- use by programs that want to launch and manage a Tor process
- without allowing other programs to manage it as well. For more
- information, see the __OwningControllerFD option documented in
- control-spec.txt. Closes ticket 23900.
- - On most errors that would cause Tor to exit, it now tries to
- return from the tor_main() function, rather than calling the
- system exit() function. Most users won't notice a difference here,
- but it should be significant for programs that run Tor inside a
- separate thread: they should now be able to survive Tor's exit
- conditions rather than having Tor shut down the entire process.
- Closes ticket 23848.
- - Applications that want to embed Tor can now tell Tor not to
- register any of its own POSIX signal handlers, using the
- __DisableSignalHandlers option. Closes ticket 24588.
- o Minor features (fallback directory list):
- - Avoid selecting fallbacks that change their IP addresses too
- often. Select more fallbacks by ignoring the Guard flag, and
- allowing lower cutoffs for the Running and V2Dir flags. Also allow
- a lower bandwidth, and a higher number of fallbacks per operator
- (5% of the list). Implements ticket 24785.
- - Update the fallback whitelist and blacklist based on opt-ins and
- relay changes. Closes tickets 22321, 24678, 22527, 24135,
- and 24695.
- o Minor features (fallback directory mirror configuration):
- - Add a nickname to each fallback in a C comment. This makes it
- easier for operators to find their relays, and allows stem to use
- nicknames to identify fallbacks. Implements ticket 24600.
- - Add a type and version header to the fallback directory mirror
- file. Also add a delimiter to the end of each fallback entry. This
- helps external parsers like stem and Relay Search. Implements
- ticket 24725.
- - Add an extrainfo cache flag for each fallback in a C comment. This
- allows stem to use fallbacks to fetch extra-info documents, rather
- than using authorities. Implements ticket 22759.
- - Add the generateFallbackDirLine.py script for automatically
- generating fallback directory mirror lines from relay fingerprints.
- No more typos! Add the lookupFallbackDirContact.py script for
- automatically looking up operator contact info from relay
- fingerprints. Implements ticket 24706, patch by teor and atagar.
- - Reject any fallback directory mirror that serves an expired
- consensus. Implements ticket 20942, patch by "minik".
- - Remove commas and equals signs from external string inputs to the
- fallback list. This avoids format confusion attacks. Implements
- ticket 24726.
- - Remove the "weight=10" line from fallback directory mirror
- entries. Ticket 24681 will maintain the current fallback weights
- by changing Tor's default fallback weight to 10. Implements
- ticket 24679.
- - Stop logging excessive information about fallback netblocks.
- Implements ticket 24791.
- o Minor features (forward-compatibility):
- - If a relay supports some link authentication protocol that we do
- not recognize, then include that relay's ed25519 key when telling
- other relays to extend to it. Previously, we treated future
- versions as if they were too old to support ed25519 link
- authentication. Closes ticket 20895.
- o Minor features (geoip):
- - Update geoip and geoip6 to the May 1 2018 Maxmind GeoLite2 Country
- database. Closes ticket 26104.
- o Minor features (heartbeat):
- - Add onion service information to our heartbeat logs, displaying
- stats about the activity of configured onion services. Closes
- ticket 24896.
- o Minor features (instrumentation, development):
- - Add the MainloopStats option to allow developers to get
- instrumentation information from the main event loop via the
- heartbeat messages. We hope to use this to improve Tor's behavior
- when it's trying to sleep. Closes ticket 24605.
- o Minor features (IPv6):
- - Make IPv6-only clients wait for microdescs for relays, even if we
- were previously using descriptors (or were using them as a bridge)
- and have a cached descriptor for them. Implements ticket 23827.
- - When a consensus has IPv6 ORPorts, make IPv6-only clients use
- them, rather than waiting to download microdescriptors. Implements
- ticket 23827.
- o Minor features (log messages):
- - Improve log message in the out-of-memory handler to include
- information about memory usage from the different compression
- backends. Closes ticket 25372.
- - Improve a warning message that happens when we fail to re-parse an
- old router because of an expired certificate. Closes ticket 20020.
- - Make the log more quantitative when we hit MaxMemInQueues
- threshold exposing some values. Closes ticket 24501.
- o Minor features (logging):
- - Clarify the log messages produced when getrandom() or a related
- entropy-generation mechanism gives an error. Closes ticket 25120.
- - Added support for the Android logging subsystem. Closes
- ticket 24362.
- o Minor features (performance):
- - Support predictive circuit building for onion service circuits
- with multiple layers of guards. Closes ticket 23101.
- - Use stdatomic.h where available, rather than mutexes, to implement
- atomic_counter_t. Closes ticket 23953.
- o Minor features (performance, 32-bit):
- - Improve performance on 32-bit systems by avoiding 64-bit division
- when calculating the timestamp in milliseconds for channel padding
- computations. Implements ticket 24613.
- - Improve performance on 32-bit systems by avoiding 64-bit division
- when timestamping cells and buffer chunks for OOM calculations.
- Implements ticket 24374.
- o Minor features (performance, OSX, iOS):
- - Use the mach_approximate_time() function (when available) to
- implement coarse monotonic time. Having a coarse time function
- should avoid a large number of system calls, and improve
- performance slightly, especially under load. Closes ticket 24427.
- o Minor features (performance, windows):
- - Improve performance on Windows Vista and Windows 7 by adjusting
- TCP send window size according to the recommendation from
- SIO_IDEAL_SEND_BACKLOG_QUERY. Closes ticket 22798. Patch
- from Vort.
- o Minor features (sandbox):
- - Explicitly permit the poll() system call when the Linux
- seccomp2-based sandbox is enabled: apparently, some versions of
- libc use poll() when calling getpwnam(). Closes ticket 25313.
- o Minor features (storage, configuration):
- - Users can store cached directory documents somewhere other than
- the DataDirectory by using the CacheDirectory option. Similarly,
- the storage location for relay's keys can be overridden with the
- KeyDirectory option. Closes ticket 22703.
- o Minor features (testing):
- - Add a "make test-rust" target to run the rust tests only. Closes
- ticket 25071.
- o Minor features (testing, debugging, embedding):
- - For development purposes, Tor now has a mode in which it runs for
- a few seconds, then stops, and starts again without exiting the
- process. This mode is meant to help us debug various issues with
- ticket 23847. To use this feature, compile with
- --enable-restart-debugging, and set the TOR_DEBUG_RESTART
- environment variable. This is expected to crash a lot, and is
- really meant for developers only. It will likely be removed in a
- future release. Implements ticket 24583.
- o Minor bugfixes (build, rust):
- - Fix output of autoconf checks to display success messages for Rust
- dependencies and a suitable rustc compiler version. Fixes bug
- 24612; bugfix on 0.3.1.3-alpha.
- - Don't pass the --quiet option to cargo: it seems to suppress some
- errors, which is not what we want to do when building. Fixes bug
- 24518; bugfix on 0.3.1.7.
- - Build correctly when building from outside Tor's source tree with
- the TOR_RUST_DEPENDENCIES option set. Fixes bug 22768; bugfix
- on 0.3.1.7.
- o Minor bugfixes (C correctness):
- - Fix a very unlikely (impossible, we believe) null pointer
- dereference. Fixes bug 25629; bugfix on 0.2.9.15. Found by
- Coverity; this is CID 1430932.
- o Minor bugfixes (channel, client):
- - Better identify client connection when reporting to the geoip
- client cache. Fixes bug 24904; bugfix on 0.3.1.7.
- o Minor bugfixes (circuit, cannibalization):
- - Don't cannibalize preemptively-built circuits if we no longer
- recognize their first hop. This situation can happen if our Guard
- relay went off the consensus after the circuit was created. Fixes
- bug 24469; bugfix on 0.0.6.
- o Minor bugfixes (client, backport from 0.3.4.1-alpha):
- - Don't consider Tor running as a client if the ControlPort is open,
- but no actual client ports are open. Fixes bug 26062; bugfix
- on 0.2.9.4-alpha.
- o Minor bugfixes (compilation):
- - Fix a C99 compliance issue in our configuration script that caused
- compilation issues when compiling Tor with certain versions of
- xtools. Fixes bug 25474; bugfix on 0.3.2.5-alpha.
- o Minor bugfixes (controller):
- - Restore the correct operation of the RESOLVE command, which had
- been broken since we added the ability to enable/disable DNS on
- specific listener ports. Fixes bug 25617; bugfix on 0.2.9.3-alpha.
- - Avoid a (nonfatal) assertion failure when extending a one-hop
- circuit from the controller to become a multihop circuit. Fixes
- bug 24903; bugfix on 0.2.5.2-alpha.
- o Minor bugfixes (correctness):
- - Remove a nonworking, unnecessary check to see whether a circuit
- hop's identity digest was set when the circuit failed. Fixes bug
- 24927; bugfix on 0.2.4.4-alpha.
- o Minor bugfixes (correctness, client, backport from 0.3.4.1-alpha):
- - Upon receiving a malformed connected cell, stop processing the
- cell immediately. Previously we would mark the connection for
- close, but continue processing the cell as if the connection were
- open. Fixes bug 26072; bugfix on 0.2.4.7-alpha.
- o Minor bugfixes (directory authorities, IPv6):
- - When creating a routerstatus (vote) from a routerinfo (descriptor),
- set the IPv6 address to the unspecified IPv6 address, and
- explicitly initialize the port to zero. Fixes bug 24488; bugfix
- on 0.2.4.1-alpha.
- o Minor bugfixes (documentation):
- - Document that the PerConnBW{Rate,Burst} options will fall back to
- their corresponding consensus parameters only if those parameters
- are set. Previously we had claimed that these values would always
- be set in the consensus. Fixes bug 25296; bugfix on 0.2.2.7-alpha.
- o Minor bugfixes (documentation, backport from 0.3.4.1-alpha):
- - Stop saying in the manual that clients cache ipv4 dns answers from
- exit relays. We haven't used them since 0.2.6.3-alpha, and in
- ticket 24050 we stopped even caching them as of 0.3.2.6-alpha, but
- we forgot to say so in the man page. Fixes bug 26052; bugfix
- on 0.3.2.6-alpha.
- o Minor bugfixes (exit relay DNS retries):
- - Re-attempt timed-out DNS queries 3 times before failure, since our
- timeout is 5 seconds for them, but clients wait 10-15. Also allow
- slightly more timeouts per resolver when an exit has multiple
- resolvers configured. Fixes bug 21394; bugfix on 0.3.1.9.
- o Minor bugfixes (fallback directory mirrors):
- - Make updateFallbackDirs.py search harder for python. (Some OSs
- don't put it in /usr/bin.) Fixes bug 24708; bugfix
- on 0.2.8.1-alpha.
- o Minor bugfixes (hibernation, bandwidth accounting, shutdown):
- - When hibernating, close connections normally and allow them to
- flush. Fixes bug 23571; bugfix on 0.2.4.7-alpha. Also fixes
- bug 7267.
- - Do not attempt to launch self-reachability tests when entering
- hibernation. Fixes a case of bug 12062; bugfix on 0.0.9pre5.
- - Resolve several bugs related to descriptor fetching on bridge
- clients with bandwidth accounting enabled. (This combination is
- not recommended!) Fixes a case of bug 12062; bugfix
- on 0.2.0.3-alpha.
- - When hibernating, do not attempt to launch DNS checks. Fixes a
- case of bug 12062; bugfix on 0.1.2.2-alpha.
- - When hibernating, do not try to upload or download descriptors.
- Fixes a case of bug 12062; bugfix on 0.0.9pre5.
- o Minor bugfixes (IPv6, bridges):
- - Tor now always sets IPv6 preferences for bridges. Fixes bug 24573;
- bugfix on 0.2.8.2-alpha.
- - Tor now sets IPv6 address in the routerstatus as well as in the
- router descriptors when updating addresses for a bridge. Closes
- ticket 24572; bugfix on 0.2.4.5-alpha. Patch by "ffmancera".
- o Minor bugfixes (Linux seccomp2 sandbox):
- - When running with the sandbox enabled, reload configuration files
- correctly even when %include was used. Previously we would crash.
- Fixes bug 22605; bugfix on 0.3.1. Patch from Daniel Pinto.
- o Minor bugfixes (Linux seccomp2 sandbox, backport from 0.3.4.1-alpha):
- - Allow the nanosleep() system call, which glibc uses to implement
- sleep() and usleep(). Fixes bug 24969; bugfix on 0.2.5.1-alpha.
- o Minor bugfixes (logging):
- - Fix a (mostly harmless) race condition when invoking
- LOG_PROTOCOL_WARN message from a subthread while the torrc options
- are changing. Fixes bug 23954; bugfix on 0.1.1.9-alpha.
- o Minor bugfixes (man page, SocksPort):
- - Remove dead code from the old "SocksSocket" option, and rename
- SocksSocketsGroupWritable to UnixSocksGroupWritable. The old
- option still works, but is deprecated. Fixes bug 24343; bugfix
- on 0.2.6.3.
- o Minor bugfixes (memory leaks):
- - Avoid possible at-exit memory leaks related to use of Libevent's
- event_base_once() function. (This function tends to leak memory if
- the event_base is closed before the event fires.) Fixes bug 24584;
- bugfix on 0.2.8.1-alpha.
- - Fix a harmless memory leak in tor-resolve. Fixes bug 24582; bugfix
- on 0.2.1.1-alpha.
- o Minor bugfixes (network IPv6 test):
- - Tor's test scripts now check if "ping -6 ::1" works when the user
- runs "make test-network-all". Fixes bug 24677; bugfix on
- 0.2.9.3-alpha. Patch by "ffmancera".
- o Minor bugfixes (networking):
- - string_is_valid_hostname() will not consider IP strings to be
- valid hostnames. Fixes bug 25055; bugfix on Tor 0.2.5.5.
- o Minor bugfixes (onion service v3):
- - Avoid an assertion failure when the next onion service descriptor
- rotation type is out of sync with the consensus's valid-after
- time. Instead, log a warning message with extra information, so we
- can better hunt down the cause of this assertion. Fixes bug 25306;
- bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (onion service, backport from 0.3.4.1-alpha):
- - Fix a memory leak when a v3 onion service is configured and gets a
- SIGHUP signal. Fixes bug 25901; bugfix on 0.3.2.1-alpha.
- - When parsing the descriptor signature, look for the token plus an
- extra white-space at the end. This is more correct but also will
- allow us to support new fields that might start with "signature".
- Fixes bug 26069; bugfix on 0.3.0.1-alpha.
- o Minor bugfixes (onion services):
- - If we are configured to offer a single onion service, don't log
- long-term established one hop rendezvous points in the heartbeat.
- Fixes bug 25116; bugfix on 0.2.9.6-rc.
- o Minor bugfixes (performance):
- - Reduce the number of circuits that will be opened at once during
- the circuit build timeout phase. This is done by increasing the
- idle timeout to 3 minutes, and lowering the maximum number of
- concurrent learning circuits to 10. Fixes bug 24769; bugfix
- on 0.3.1.1-alpha.
- - Avoid calling protocol_list_supports_protocol() from inside tight
- loops when running with cached routerinfo_t objects. Instead,
- summarize the relevant protocols as flags in the routerinfo_t, as
- we do for routerstatus_t objects. This change simplifies our code
- a little, and saves a large amount of short-term memory allocation
- operations. Fixes bug 25008; bugfix on 0.2.9.4-alpha.
- o Minor bugfixes (performance, timeouts):
- - Consider circuits for timeout as soon as they complete a hop. This
- is more accurate than applying the timeout in
- circuit_expire_building() because that function is only called
- once per second, which is now too slow for typical timeouts on the
- current network. Fixes bug 23114; bugfix on 0.2.2.2-alpha.
- - Use onion service circuits (and other circuits longer than 3 hops)
- to calculate a circuit build timeout. Previously, Tor only
- calculated its build timeout based on circuits that planned to be
- exactly 3 hops long. With this change, we include measurements
- from all circuits at the point where they complete their third
- hop. Fixes bug 23100; bugfix on 0.2.2.2-alpha.
- o Minor bugfixes (relay, crash, backport from 0.3.4.1-alpha):
- - Avoid a crash when running with DirPort set but ORPort turned off.
- Fixes a case of bug 23693; bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (Rust FFI):
- - Fix a minor memory leak which would happen whenever the C code
- would call the Rust implementation of
- protover_get_supported_protocols(). This was due to the C version
- returning a static string, whereas the Rust version newly allocated
- a CString to pass across the FFI boundary. Consequently, the C
- code was not expecting to need to free() what it was given. Fixes
- bug 25127; bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (spelling):
- - Use the "misspell" tool to detect and fix typos throughout the
- source code. Fixes bug 23650; bugfix on various versions of Tor.
- Patch from Deepesh Pathak.
- o Minor bugfixes (testing):
- - Avoid intermittent test failures due to a test that had relied on
- onion service introduction point creation finishing within 5
- seconds of real clock time. Fixes bug 25450; bugfix
- on 0.3.1.3-alpha.
- - Give out Exit flags in bootstrapping networks. Fixes bug 24137;
- bugfix on 0.2.3.1-alpha.
- o Minor bugfixes (unit test, monotonic time):
- - Increase a constant (1msec to 10msec) in the monotonic time test
- that makes sure the nsec/usec/msec times read are synchronized.
- This change was needed to accommodate slow systems like armel or
- when the clock_gettime() is not a VDSO on the running kernel.
- Fixes bug 25113; bugfix on 0.2.9.1.
- o Code simplification and refactoring:
- - Move the list of default directory authorities to its own file.
- Closes ticket 24854. Patch by "beastr0".
- - Remove the old (deterministic) directory retry logic entirely:
- We've used exponential backoff exclusively for some time. Closes
- ticket 23814.
- - Remove the unused nodelist_recompute_all_hsdir_indices(). Closes
- ticket 25108.
- - Remove a series of counters used to track circuit extend attempts
- and connection status but that in reality we aren't using for
- anything other than stats logged by a SIGUSR1 signal. Closes
- ticket 25163.
- - Remove /usr/athena from search path in configure.ac. Closes
- ticket 24363.
- - Remove duplicate code in node_has_curve25519_onion_key() and
- node_get_curve25519_onion_key(), and add a check for a zero
- microdesc curve25519 onion key. Closes ticket 23966, patch by
- "aruna1234" and teor.
- - Rewrite channel_rsa_id_group_set_badness to reduce temporary
- memory allocations with large numbers of OR connections (e.g.
- relays). Closes ticket 24119.
- - Separate the function that deletes ephemeral files when Tor
- stops gracefully.
- - Small changes to Tor's buf_t API to make it suitable for use as a
- general-purpose safe string constructor. Closes ticket 22342.
- - Switch -Wnormalized=id to -Wnormalized=nfkc in configure.ac to
- avoid source code identifier confusion. Closes ticket 24467.
- - The tor_git_revision[] constant no longer needs to be redeclared
- by everything that links against the rest of Tor. Done as part of
- ticket 23845, to simplify our external API.
- - We make extend_info_from_node() use node_get_curve25519_onion_key()
- introduced in ticket 23577 to access the curve25519 public keys
- rather than accessing it directly. Closes ticket 23760. Patch by
- Neel Chauhan.
- - Add a function to log channels' scheduler state changes to aid
- debugging efforts. Closes ticket 24531.
- o Documentation:
- - Improved the documentation of AccountingStart parameter. Closes
- ticket 23635.
- - Update the documentation for "Log" to include the current list of
- logging domains. Closes ticket 25378.
- - Add documentation on how to build tor with Rust dependencies
- without having to be online. Closes ticket 22907; bugfix
- on 0.3.0.3-alpha.
- - Clarify the behavior of RelayBandwidth{Rate,Burst} with client
- traffic. Closes ticket 24318.
- - Document that OutboundBindAddress doesn't apply to DNS requests.
- Closes ticket 22145. Patch from Aruna Maurya.
- o Code simplification and refactoring (channels):
- - Remove the incoming and outgoing channel queues. These were never
- used, but still took up a step in our fast path.
- - The majority of the channel unit tests have been rewritten and the
- code coverage has now been raised to 83.6% for channel.c. Closes
- ticket 23709.
- - Remove other dead code from the channel subsystem: All together,
- this cleanup has removed more than 1500 lines of code overall and
- adding very little except for unit test.
- o Code simplification and refactoring (circuit rendezvous):
- - Split the client-side rendezvous circuit lookup into two
- functions: one that returns only established circuits and another
- that returns all kinds of circuits. Closes ticket 23459.
- o Code simplification and refactoring (controller):
- - Make most of the variables in networkstatus_getinfo_by_purpose()
- const. Implements ticket 24489.
- o Documentation (backport from 0.3.4.1-alpha):
- - Correct an IPv6 error in the documentation for ExitPolicy. Closes
- ticket 25857. Patch from "CTassisF".
- o Documentation (man page):
- - The HiddenServiceVersion torrc option accepts only one number:
- either version 2 or 3. Closes ticket 25026; bugfix
- on 0.3.2.2-alpha.
- o Documentation (manpage, denial of service):
- - Provide more detail about the denial-of-service options, by
- listing each mitigation and explaining how they relate. Closes
- ticket 25248.
- Changes in version 0.3.1.10 - 2018-03-03
- Tor 0.3.1.10 backports a number of bugfixes, including important fixes for
- security issues.
- It includes an important security fix for a remote crash attack
- against directory authorities, tracked as TROVE-2018-001.
- This release also backports our new system for improved resistance to
- denial-of-service attacks against relays.
- This release also fixes several minor bugs and annoyances from
- earlier releases.
- All directory authorities should upgrade to one of the versions
- released today. Relays running 0.3.1.x may wish to update to one of
- the versions released today, for the DoS mitigations.
- Please note: according to our release calendar, Tor 0.3.1 will no
- longer be supported after 1 July 2018. If you will be running Tor
- after that date, you should make sure to plan to upgrade to the latest
- stable version, or downgrade to 0.2.9 (which will receive long-term
- support).
- o Major bugfixes (denial-of-service, directory authority, backport from 0.3.3.3-alpha):
- - Fix a protocol-list handling bug that could be used to remotely crash
- directory authorities with a null-pointer exception. Fixes bug 25074;
- bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2018-001 and
- CVE-2018-0490.
- o Major features (denial-of-service mitigation, backport from 0.3.3.2-alpha):
- - Give relays some defenses against the recent network overload. We
- start with three defenses (default parameters in parentheses).
- First: if a single client address makes too many concurrent
- connections (>100), hang up on further connections. Second: if a
- single client address makes circuits too quickly (more than 3 per
- second, with an allowed burst of 90) while also having too many
- connections open (3), refuse new create cells for the next while
- (1-2 hours). Third: if a client asks to establish a rendezvous
- point to you directly, ignore the request. These defenses can be
- manually controlled by new torrc options, but relays will also
- take guidance from consensus parameters, so there's no need to
- configure anything manually. Implements ticket 24902.
- o Minor features (linux seccomp2 sandbox, backport from 0.3.2.5-alpha):
- - Update the sandbox rules so that they should now work correctly
- with Glibc 2.26. Closes ticket 24315.
- o Major bugfixes (onion services, retry behavior, backport from 0.3.3.1-alpha):
- - Fix an "off by 2" error in counting rendezvous failures on the
- onion service side. While we thought we would stop the rendezvous
- attempt after one failed circuit, we were actually making three
- circuit attempts before giving up. Now switch to a default of 2,
- and allow the consensus parameter "hs_service_max_rdv_failures" to
- override. Fixes bug 24895; bugfix on 0.0.6.
- o Major bugfixes (protocol versions, backport from 0.3.3.2-alpha):
- - Add Link protocol version 5 to the supported protocols list. Fixes
- bug 25070; bugfix on 0.3.1.1-alpha.
- o Major bugfixes (relay, backport from 0.3.3.1-alpha):
- - Fix a set of false positives where relays would consider
- connections to other relays as being client-only connections (and
- thus e.g. deserving different link padding schemes) if those
- relays fell out of the consensus briefly. Now we look only at the
- initial handshake and whether the connection authenticated as a
- relay. Fixes bug 24898; bugfix on 0.3.1.1-alpha.
- o Minor features (denial-of-service avoidance, backport from 0.3.3.2-alpha):
- - Make our OOM handler aware of the geoip client history cache so it
- doesn't fill up the memory. This check is important for IPv6 and
- our DoS mitigation subsystem. Closes ticket 25122.
- o Minor feature (relay statistics, backport from 0.3.2.6-alpha):
- - Change relay bandwidth reporting stats interval from 4 hours to 24
- hours in order to reduce the efficiency of guard discovery
- attacks. Fixes ticket 23856.
- o Minor features (compatibility, OpenSSL, backport from 0.3.3.3-alpha):
- - Tor will now support TLS1.3 once OpenSSL 1.1.1 is released.
- Previous versions of Tor would not have worked with OpenSSL 1.1.1,
- since they neither disabled TLS 1.3 nor enabled any of the
- ciphersuites it requires. Now we enable the TLS 1.3 ciphersuites.
- Closes ticket 24978.
- o Minor features (fallback directory mirrors, backport from 0.3.2.9):
- - The fallback directory list has been re-generated based on the
- current status of the network. Tor uses fallback directories to
- bootstrap when it doesn't yet have up-to-date directory
- information. Closes ticket 24801.
- - Make the default DirAuthorityFallbackRate 0.1, so that clients
- prefer to bootstrap from fallback directory mirrors. This is a
- follow-up to 24679, which removed weights from the default
- fallbacks. Implements ticket 24681.
- o Minor features (geoip):
- - Update geoip and geoip6 to the February 7 2018 Maxmind GeoLite2
- Country database.
- o Minor bugfix (channel connection, backport from 0.3.3.2-alpha):
- - Use the actual observed address of an incoming relay connection,
- not the canonical address of the relay from its descriptor, when
- making decisions about how to handle the incoming connection.
- Fixes bug 24952; bugfix on 0.2.4.11-alpha. Patch by "ffmancera".
- o Minor bugfix (directory authority, backport from 0.3.3.2-alpha):
- - Directory authorities, when refusing a descriptor from a rejected
- relay, now explicitly tell the relay (in its logs) to set a valid
- ContactInfo address and contact the bad-relays@ mailing list.
- Fixes bug 25170; bugfix on 0.2.9.1.
- o Minor bugfixes (address selection, backport from 0.3.2.9):
- - When the fascist_firewall_choose_address_ functions don't find a
- reachable address, set the returned address to the null address
- and port. This is a precautionary measure, because some callers do
- not check the return value. Fixes bug 24736; bugfix
- on 0.2.8.2-alpha.
- o Major bugfixes (bootstrapping, backport from 0.3.2.5-alpha):
- - Fetch descriptors aggressively whenever we lack enough to build
- circuits, regardless of how many descriptors we are missing.
- Previously, we would delay launching the fetch when we had fewer
- than 15 missing descriptors, even if some of those descriptors
- were blocking circuits from building. Fixes bug 23985; bugfix on
- 0.1.1.11-alpha. The effects of this bug became worse in
- 0.3.0.3-alpha, when we began treating missing descriptors from our
- primary guards as a reason to delay circuits.
- - Don't try fetching microdescriptors from relays that have failed
- to deliver them in the past. Fixes bug 23817; bugfix
- on 0.3.0.1-alpha.
- o Minor bugfixes (compilation, backport from 0.3.2.7-rc):
- - Fix a signed/unsigned comparison warning introduced by our fix to
- TROVE-2017-009. Fixes bug 24480; bugfix on 0.2.5.16.
- o Minor bugfixes (control port, linux seccomp2 sandbox, backport from 0.3.2.5-alpha):
- - Avoid a crash when attempting to use the seccomp2 sandbox together
- with the OwningControllerProcess feature. Fixes bug 24198; bugfix
- on 0.2.5.1-alpha.
- o Minor bugfixes (denial-of-service, backport from 0.3.3.3-alpha):
- - Fix a possible crash on malformed consensus. If a consensus had
- contained an unparseable protocol line, it could have made clients
- and relays crash with a null-pointer exception. To exploit this
- issue, however, an attacker would need to be able to subvert the
- directory authority system. Fixes bug 25251; bugfix on
- 0.2.9.4-alpha. Also tracked as TROVE-2018-004.
- o Minor bugfixes (directory cache, backport from 0.3.2.5-alpha):
- - Recover better from empty or corrupt files in the consensus cache
- directory. Fixes bug 24099; bugfix on 0.3.1.1-alpha.
- - When a consensus diff calculation is only partially successful,
- only record the successful parts as having succeeded. Partial
- success can happen if (for example) one compression method fails
- but the others succeed. Previously we misrecorded all the
- calculations as having succeeded, which would later cause a
- nonfatal assertion failure. Fixes bug 24086; bugfix
- on 0.3.1.1-alpha.
- o Minor bugfixes (entry guards, backport from 0.3.2.3-alpha):
- - Tor now updates its guard state when it reads a consensus
- regardless of whether it's missing descriptors. That makes tor use
- its primary guards to fetch descriptors in some edge cases where
- it would previously have used fallback directories. Fixes bug
- 23862; bugfix on 0.3.0.1-alpha.
- o Minor bugfixes (logging, backport from 0.3.3.2-alpha):
- - Don't treat inability to store a cached consensus object as a bug:
- it can happen normally when we are out of disk space. Fixes bug
- 24859; bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (memory usage, backport from 0.3.2.8-rc):
- - When queuing DESTROY cells on a channel, only queue the circuit-id
- and reason fields: not the entire 514-byte cell. This fix should
- help mitigate any bugs or attacks that fill up these queues, and
- free more RAM for other uses. Fixes bug 24666; bugfix
- on 0.2.5.1-alpha.
- o Minor bugfixes (network layer, backport from 0.3.2.5-alpha):
- - When closing a connection via close_connection_immediately(), we
- mark it as "not blocked on bandwidth", to prevent later calls from
- trying to unblock it, and give it permission to read. This fixes a
- backtrace warning that can happen on relays under various
- circumstances. Fixes bug 24167; bugfix on 0.1.0.1-rc.
- o Minor bugfixes (path selection, backport from 0.3.2.4-alpha):
- - When selecting relays by bandwidth, avoid a rounding error that
- could sometimes cause load to be imbalanced incorrectly.
- Previously, we would always round upwards; now, we round towards
- the nearest integer. This had the biggest effect when a relay's
- weight adjustments should have given it weight 0, but it got
- weight 1 instead. Fixes bug 23318; bugfix on 0.2.4.3-alpha.
- - When calculating the fraction of nodes that have descriptors, and
- all nodes in the network have zero bandwidths, count the number of
- nodes instead. Fixes bug 23318; bugfix on 0.2.4.10-alpha.
- - Actually log the total bandwidth in compute_weighted_bandwidths().
- Fixes bug 24170; bugfix on 0.2.4.3-alpha.
- o Minor bugfixes (performance, fragile-hardening, backport from 0.3.3.1-alpha):
- - Improve the performance of our consensus-diff application code
- when Tor is built with the --enable-fragile-hardening option set.
- Fixes bug 24826; bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (OSX, backport from 0.3.3.1-alpha):
- - Don't exit the Tor process if setrlimit() fails to change the file
- limit (which can happen sometimes on some versions of OSX). Fixes
- bug 21074; bugfix on 0.0.9pre5.
- o Minor bugfixes (portability, msvc, backport from 0.3.2.9):
- - Fix a bug in the bit-counting parts of our timing-wheel code on
- MSVC. (Note that MSVC is still not a supported build platform, due
- to cyptographic timing channel risks.) Fixes bug 24633; bugfix
- on 0.2.9.1-alpha.
- o Minor bugfixes (relay, partial backport):
- - Make the internal channel_is_client() function look at what sort
- of connection handshake the other side used, rather than whether
- the other side ever sent a create_fast cell to us. Backports part
- of the fixes from bugs 22805 and 24898.
- o Minor bugfixes (spec conformance, backport from 0.3.3.3-alpha):
- - Forbid "-0" as a protocol version. Fixes part of bug 25249; bugfix on
- 0.2.9.4-alpha.
- - Forbid UINT32_MAX as a protocol version. Fixes part of bug 25249;
- bugfix on 0.2.9.4-alpha.
- o Code simplification and refactoring (backport from 0.3.3.3-alpha):
- - Update the "rust dependencies" submodule to be a project-level
- repository, rather than a user repository. Closes ticket 25323.
- Changes in version 0.2.9.15 - 2018-03-03
- Tor 0.2.9.15 backports important security and stability bugfixes from
- later Tor releases.
- It includes an important security fix for a remote crash attack
- against directory authorities, tracked as TROVE-2018-001.
- This release also backports our new system for improved resistance to
- denial-of-service attacks against relays.
- This release also fixes several minor bugs and annoyances from
- earlier releases.
- All directory authorities should upgrade to one of the versions
- released today. Relays running 0.2.9.x may wish to update to one of
- the versions released today, for the DoS mitigations.
- o Major bugfixes (denial-of-service, directory authority, backport from 0.3.3.3-alpha):
- - Fix a protocol-list handling bug that could be used to remotely crash
- directory authorities with a null-pointer exception. Fixes bug 25074;
- bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2018-001 and
- CVE-2018-0490.
- o Major features (denial-of-service mitigation):
- - Give relays some defenses against the recent network overload. We
- start with three defenses (default parameters in parentheses).
- First: if a single client address makes too many concurrent
- connections (>100), hang up on further connections. Second: if a
- single client address makes circuits too quickly (more than 3 per
- second, with an allowed burst of 90) while also having too many
- connections open (3), refuse new create cells for the next while
- (1-2 hours). Third: if a client asks to establish a rendezvous
- point to you directly, ignore the request. These defenses can be
- manually controlled by new torrc options, but relays will also
- take guidance from consensus parameters, so there's no need to
- configure anything manually. Implements ticket 24902.
- o Major bugfixes (bootstrapping):
- - Fetch descriptors aggressively whenever we lack enough to build
- circuits, regardless of how many descriptors we are missing.
- Previously, we would delay launching the fetch when we had fewer
- than 15 missing descriptors, even if some of those descriptors
- were blocking circuits from building. Fixes bug 23985; bugfix on
- 0.1.1.11-alpha. The effects of this bug became worse in
- 0.3.0.3-alpha, when we began treating missing descriptors from our
- primary guards as a reason to delay circuits.
- o Major bugfixes (onion services, retry behavior):
- - Fix an "off by 2" error in counting rendezvous failures on the
- onion service side. While we thought we would stop the rendezvous
- attempt after one failed circuit, we were actually making three
- circuit attempts before giving up. Now switch to a default of 2,
- and allow the consensus parameter "hs_service_max_rdv_failures" to
- override. Fixes bug 24895; bugfix on 0.0.6.
- o Minor feature (relay statistics):
- - Change relay bandwidth reporting stats interval from 4 hours to 24
- hours in order to reduce the efficiency of guard discovery
- attacks. Fixes ticket 23856.
- o Minor features (compatibility, OpenSSL):
- - Tor will now support TLS1.3 once OpenSSL 1.1.1 is released.
- Previous versions of Tor would not have worked with OpenSSL 1.1.1,
- since they neither disabled TLS 1.3 nor enabled any of the
- ciphersuites it requires. Now we enable the TLS 1.3 ciphersuites.
- Closes ticket 24978.
- o Minor features (denial-of-service avoidance):
- - Make our OOM handler aware of the geoip client history cache so it
- doesn't fill up the memory. This check is important for IPv6 and
- our DoS mitigation subsystem. Closes ticket 25122.
- o Minor features (fallback directory mirrors):
- - The fallback directory list has been re-generated based on the
- current status of the network. Tor uses fallback directories to
- bootstrap when it doesn't yet have up-to-date directory
- information. Closes ticket 24801.
- - Make the default DirAuthorityFallbackRate 0.1, so that clients
- prefer to bootstrap from fallback directory mirrors. This is a
- follow-up to 24679, which removed weights from the default
- fallbacks. Implements ticket 24681.
- o Minor features (geoip):
- - Update geoip and geoip6 to the February 7 2018 Maxmind GeoLite2
- Country database.
- o Minor features (linux seccomp2 sandbox):
- - Update the sandbox rules so that they should now work correctly
- with Glibc 2.26. Closes ticket 24315.
- o Minor bugfix (channel connection):
- - Use the actual observed address of an incoming relay connection,
- not the canonical address of the relay from its descriptor, when
- making decisions about how to handle the incoming connection.
- Fixes bug 24952; bugfix on 0.2.4.11-alpha. Patch by "ffmancera".
- o Minor bugfix (directory authority):
- - Directory authorities, when refusing a descriptor from a rejected
- relay, now explicitly tell the relay (in its logs) to set a valid
- ContactInfo address and contact the bad-relays@ mailing list.
- Fixes bug 25170; bugfix on 0.2.9.1.
- o Minor bugfixes (address selection):
- - When the fascist_firewall_choose_address_ functions don't find a
- reachable address, set the returned address to the null address
- and port. This is a precautionary measure, because some callers do
- not check the return value. Fixes bug 24736; bugfix
- on 0.2.8.2-alpha.
- o Minor bugfixes (compilation):
- - Fix a signed/unsigned comparison warning introduced by our fix to
- TROVE-2017-009. Fixes bug 24480; bugfix on 0.2.5.16.
- o Minor bugfixes (control port, linux seccomp2 sandbox):
- - Avoid a crash when attempting to use the seccomp2 sandbox together
- with the OwningControllerProcess feature. Fixes bug 24198; bugfix
- on 0.2.5.1-alpha.
- o Minor bugfixes (denial-of-service, backport from 0.3.3.3-alpha):
- - Fix a possible crash on malformed consensus. If a consensus had
- contained an unparseable protocol line, it could have made clients
- and relays crash with a null-pointer exception. To exploit this
- issue, however, an attacker would need to be able to subvert the
- directory authority system. Fixes bug 25251; bugfix on
- 0.2.9.4-alpha. Also tracked as TROVE-2018-004.
- o Minor bugfixes (memory usage):
- - When queuing DESTROY cells on a channel, only queue the circuit-id
- and reason fields: not the entire 514-byte cell. This fix should
- help mitigate any bugs or attacks that fill up these queues, and
- free more RAM for other uses. Fixes bug 24666; bugfix
- on 0.2.5.1-alpha.
- o Minor bugfixes (network layer):
- - When closing a connection via close_connection_immediately(), we
- mark it as "not blocked on bandwidth", to prevent later calls from
- trying to unblock it, and give it permission to read. This fixes a
- backtrace warning that can happen on relays under various
- circumstances. Fixes bug 24167; bugfix on 0.1.0.1-rc.
- o Minor bugfixes (OSX):
- - Don't exit the Tor process if setrlimit() fails to change the file
- limit (which can happen sometimes on some versions of OSX). Fixes
- bug 21074; bugfix on 0.0.9pre5.
- o Minor bugfixes (path selection):
- - When selecting relays by bandwidth, avoid a rounding error that
- could sometimes cause load to be imbalanced incorrectly.
- Previously, we would always round upwards; now, we round towards
- the nearest integer. This had the biggest effect when a relay's
- weight adjustments should have given it weight 0, but it got
- weight 1 instead. Fixes bug 23318; bugfix on 0.2.4.3-alpha.
- - When calculating the fraction of nodes that have descriptors, and
- all nodes in the network have zero bandwidths, count the number of
- nodes instead. Fixes bug 23318; bugfix on 0.2.4.10-alpha.
- - Actually log the total bandwidth in compute_weighted_bandwidths().
- Fixes bug 24170; bugfix on 0.2.4.3-alpha.
- o Minor bugfixes (portability, msvc):
- - Fix a bug in the bit-counting parts of our timing-wheel code on
- MSVC. (Note that MSVC is still not a supported build platform, due
- to cryptographic timing channel risks.) Fixes bug 24633; bugfix
- on 0.2.9.1-alpha.
- o Minor bugfixes (relay):
- - Make the internal channel_is_client() function look at what sort
- of connection handshake the other side used, rather than whether
- the other side ever sent a create_fast cell to us. Backports part
- of the fixes from bugs 22805 and 24898.
- o Minor bugfixes (spec conformance, backport from 0.3.3.3-alpha):
- - Forbid "-0" as a protocol version. Fixes part of bug 25249; bugfix on
- 0.2.9.4-alpha.
- - Forbid UINT32_MAX as a protocol version. Fixes part of bug 25249;
- bugfix on 0.2.9.4-alpha.
- Changes in version 0.3.2.10 - 2018-03-03
- Tor 0.3.2.10 is the second stable release in the 0.3.2 series. It
- backports a number of bugfixes, including important fixes for security
- issues.
- It includes an important security fix for a remote crash attack
- against directory authorities, tracked as TROVE-2018-001.
- Additionally, it backports a fix for a bug whose severity we have
- upgraded: Bug 24700, which was fixed in 0.3.3.2-alpha, can be remotely
- triggered in order to crash relays with a use-after-free pattern. As
- such, we are now tracking that bug as TROVE-2018-002 and
- CVE-2018-0491, and backporting it to earlier releases. This bug
- affected versions 0.3.2.1-alpha through 0.3.2.9, as well as version
- 0.3.3.1-alpha.
- This release also backports our new system for improved resistance to
- denial-of-service attacks against relays.
- This release also fixes several minor bugs and annoyances from
- earlier releases.
- Relays running 0.3.2.x SHOULD upgrade to one of the versions released
- today, for the fix to TROVE-2018-002. Directory authorities should
- also upgrade. (Relays on earlier versions might want to update too for
- the DoS mitigations.)
- o Major bugfixes (denial-of-service, directory authority, backport from 0.3.3.3-alpha):
- - Fix a protocol-list handling bug that could be used to remotely crash
- directory authorities with a null-pointer exception. Fixes bug 25074;
- bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2018-001 and
- CVE-2018-0490.
- o Major bugfixes (scheduler, KIST, denial-of-service, backport from 0.3.3.2-alpha):
- - Avoid adding the same channel twice in the KIST scheduler pending
- list, which could lead to remote denial-of-service use-after-free
- attacks against relays. Fixes bug 24700; bugfix on 0.3.2.1-alpha.
- o Major features (denial-of-service mitigation, backport from 0.3.3.2-alpha):
- - Give relays some defenses against the recent network overload. We
- start with three defenses (default parameters in parentheses).
- First: if a single client address makes too many concurrent
- connections (>100), hang up on further connections. Second: if a
- single client address makes circuits too quickly (more than 3 per
- second, with an allowed burst of 90) while also having too many
- connections open (3), refuse new create cells for the next while
- (1-2 hours). Third: if a client asks to establish a rendezvous
- point to you directly, ignore the request. These defenses can be
- manually controlled by new torrc options, but relays will also
- take guidance from consensus parameters, so there's no need to
- configure anything manually. Implements ticket 24902.
- o Major bugfixes (onion services, retry behavior, backport from 0.3.3.1-alpha):
- - Fix an "off by 2" error in counting rendezvous failures on the
- onion service side. While we thought we would stop the rendezvous
- attempt after one failed circuit, we were actually making three
- circuit attempts before giving up. Now switch to a default of 2,
- and allow the consensus parameter "hs_service_max_rdv_failures" to
- override. Fixes bug 24895; bugfix on 0.0.6.
- - New-style (v3) onion services now obey the "max rendezvous circuit
- attempts" logic. Previously they would make as many rendezvous
- circuit attempts as they could fit in the MAX_REND_TIMEOUT second
- window before giving up. Fixes bug 24894; bugfix on 0.3.2.1-alpha.
- o Major bugfixes (protocol versions, backport from 0.3.3.2-alpha):
- - Add Link protocol version 5 to the supported protocols list. Fixes
- bug 25070; bugfix on 0.3.1.1-alpha.
- o Major bugfixes (relay, backport from 0.3.3.1-alpha):
- - Fix a set of false positives where relays would consider
- connections to other relays as being client-only connections (and
- thus e.g. deserving different link padding schemes) if those
- relays fell out of the consensus briefly. Now we look only at the
- initial handshake and whether the connection authenticated as a
- relay. Fixes bug 24898; bugfix on 0.3.1.1-alpha.
- o Major bugfixes (scheduler, consensus, backport from 0.3.3.2-alpha):
- - The scheduler subsystem was failing to promptly notice changes in
- consensus parameters, making it harder to switch schedulers
- network-wide. Fixes bug 24975; bugfix on 0.3.2.1-alpha.
- o Minor features (denial-of-service avoidance, backport from 0.3.3.2-alpha):
- - Make our OOM handler aware of the geoip client history cache so it
- doesn't fill up the memory. This check is important for IPv6 and
- our DoS mitigation subsystem. Closes ticket 25122.
- o Minor features (compatibility, OpenSSL, backport from 0.3.3.3-alpha):
- - Tor will now support TLS1.3 once OpenSSL 1.1.1 is released.
- Previous versions of Tor would not have worked with OpenSSL 1.1.1,
- since they neither disabled TLS 1.3 nor enabled any of the
- ciphersuites it requires. Now we enable the TLS 1.3 ciphersuites.
- Closes ticket 24978.
- o Minor features (geoip):
- - Update geoip and geoip6 to the February 7 2018 Maxmind GeoLite2
- Country database.
- o Minor features (logging, diagnostic, backport from 0.3.3.2-alpha):
- - When logging a failure to create an onion service's descriptor,
- also log what the problem with the descriptor was. Diagnostic
- for ticket 24972.
- o Minor bugfix (channel connection, backport from 0.3.3.2-alpha):
- - Use the actual observed address of an incoming relay connection,
- not the canonical address of the relay from its descriptor, when
- making decisions about how to handle the incoming connection.
- Fixes bug 24952; bugfix on 0.2.4.11-alpha. Patch by "ffmancera".
- o Minor bugfixes (denial-of-service, backport from 0.3.3.3-alpha):
- - Fix a possible crash on malformed consensus. If a consensus had
- contained an unparseable protocol line, it could have made clients
- and relays crash with a null-pointer exception. To exploit this
- issue, however, an attacker would need to be able to subvert the
- directory authority system. Fixes bug 25251; bugfix on
- 0.2.9.4-alpha. Also tracked as TROVE-2018-004.
- o Minor bugfix (directory authority, backport from 0.3.3.2-alpha):
- - Directory authorities, when refusing a descriptor from a rejected
- relay, now explicitly tell the relay (in its logs) to set a valid
- ContactInfo address and contact the bad-relays@ mailing list.
- Fixes bug 25170; bugfix on 0.2.9.1.
- o Minor bugfixes (build, rust, backport from 0.3.3.1-alpha):
- - When building with Rust on OSX, link against libresolv, to work
- around the issue at https://github.com/rust-lang/rust/issues/46797.
- Fixes bug 24652; bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (onion services, backport from 0.3.3.2-alpha):
- - Remove a BUG() statement when a client fetches an onion descriptor
- that has a lower revision counter than the one in its cache. This
- can happen in normal circumstances due to HSDir desync. Fixes bug
- 24976; bugfix on 0.3.2.1-alpha.
- o Minor bugfixes (logging, backport from 0.3.3.2-alpha):
- - Don't treat inability to store a cached consensus object as a bug:
- it can happen normally when we are out of disk space. Fixes bug
- 24859; bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (performance, fragile-hardening, backport from 0.3.3.1-alpha):
- - Improve the performance of our consensus-diff application code
- when Tor is built with the --enable-fragile-hardening option set.
- Fixes bug 24826; bugfix on 0.3.1.1-alpha.
- o Minor bugfixes (OSX, backport from 0.3.3.1-alpha):
- - Don't exit the Tor process if setrlimit() fails to change the file
- limit (which can happen sometimes on some versions of OSX). Fixes
- bug 21074; bugfix on 0.0.9pre5.
- o Minor bugfixes (spec conformance, backport from 0.3.3.3-alpha):
- - Forbid "-0" as a protocol version. Fixes part of bug 25249; bugfix on
- 0.2.9.4-alpha.
- - Forbid UINT32_MAX as a protocol version. Fixes part of bug 25249;
- bugfix on 0.2.9.4-alpha.
- o Minor bugfixes (testing, backport from 0.3.3.1-alpha):
- - Fix a memory leak in the scheduler/loop_kist unit test. Fixes bug
- 25005; bugfix on 0.3.2.7-rc.
- o Minor bugfixes (v3 onion services, backport from 0.3.3.2-alpha):
- - Look at the "HSRend" protocol version, not the "HSDir" protocol
- version, when deciding whether a consensus entry can support the
- v3 onion service protocol as a rendezvous point. Fixes bug 25105;
- bugfix on 0.3.2.1-alpha.
- o Code simplification and refactoring (backport from 0.3.3.3-alpha):
- - Update the "rust dependencies" submodule to be a project-level
- repository, rather than a user repository. Closes ticket 25323.
- o Documentation (backport from 0.3.3.1-alpha)
- - Document that operators who run more than one relay or bridge are
- expected to set MyFamily and ContactInfo correctly. Closes
- ticket 24526.
- Changes in version 0.3.2.9 - 2018-01-09
- Tor 0.3.2.9 is the first stable release in the 0.3.2 series.
- The 0.3.2 series includes our long-anticipated new onion service
- design, with numerous security features. (For more information, see
- our blog post at https://blog.torproject.org/fall-harvest.) We also
- have a new circuit scheduler algorithm for improved performance on
- relays everywhere (see https://blog.torproject.org/kist-and-tell),
- along with many smaller features and bugfixes.
- Per our stable release policy, we plan to support each stable release
- series for at least the next nine months, or for three months after
- the first stable release of the next series: whichever is longer. If
- you need a release with long-term support, we recommend that you stay
- with the 0.2.9 series.
- Below is a list of the changes since 0.3.1.7. For a list of all
- changes since 0.3.2.8-rc, see the ChangeLog file.
- o Directory authority changes:
- - Add "Bastet" as a ninth directory authority to the default list.
- Closes ticket 23910.
- - The directory authority "Longclaw" has changed its IP address.
- Closes ticket 23592.
- - Remove longclaw's IPv6 address, as it will soon change. Authority
- IPv6 addresses were originally added in 0.2.8.1-alpha. This leaves
- 3/8 directory authorities with IPv6 addresses, but there are also
- 52 fallback directory mirrors with IPv6 addresses. Resolves 19760.
- - Add an IPv6 address for the "bastet" directory authority. Closes
- ticket 24394.
- o Major features (next-generation onion services):
- - Tor now supports the next-generation onion services protocol for
- clients and services! As part of this release, the core of
- proposal 224 has been implemented and is available for
- experimentation and testing by our users. This newer version of
- onion services ("v3") features many improvements over the legacy
- system, including:
- a) Better crypto (replaced SHA1/DH/RSA1024
- with SHA3/ed25519/curve25519)
- b) Improved directory protocol, leaking much less information to
- directory servers.
- c) Improved directory protocol, with smaller surface for
- targeted attacks.
- d) Better onion address security against impersonation.
- e) More extensible introduction/rendezvous protocol.
- f) A cleaner and more modular codebase.
- You can identify a next-generation onion address by its length:
- they are 56 characters long, as in
- "4acth47i6kxnvkewtm6q7ib2s3ufpo5sqbsnzjpbi7utijcltosqemad.onion".
- In the future, we will release more options and features for v3
- onion services, but we first need a testing period, so that the
- current codebase matures and becomes more robust. Planned features
- include: offline keys, advanced client authorization, improved
- guard algorithms, and statistics. For full details, see
- proposal 224.
- Legacy ("v2") onion services will still work for the foreseeable
- future, and will remain the default until this new codebase gets
- tested and hardened. Service operators who want to experiment with
- the new system can use the 'HiddenServiceVersion 3' torrc
- directive along with the regular onion service configuration
- options. For more information, see our blog post at
- "https://blog.torproject.org/fall-harvest". Enjoy!
- o Major feature (scheduler, channel):
- - Tor now uses new schedulers to decide which circuits should
- deliver cells first, in order to improve congestion at relays. The
- first type is called "KIST" ("Kernel Informed Socket Transport"),
- and is only available on Linux-like systems: it uses feedback from
- the kernel to prevent the kernel's TCP buffers from growing too
- full. The second new scheduler type is called "KISTLite": it
- behaves the same as KIST, but runs on systems without kernel
- support for inspecting TCP implementation details. The old
- scheduler is still available, under the name "Vanilla". To change
- the default scheduler preference order, use the new "Schedulers"
- option. (The default preference order is "KIST,KISTLite,Vanilla".)
- Matt Traudt implemented KIST, based on research by Rob Jansen,
- John Geddes, Christ Wacek, Micah Sherr, and Paul Syverson. For
- more information, see the design paper at
- http://www.robgjansen.com/publications/kist-sec2014.pdf and the
- followup implementation paper at https://arxiv.org/abs/1709.01044.
- Closes ticket 12541. For more information, see our blog post at
- "https://blog.torproject.org/kist-and-tell".
- o Major bugfixes (security, general):
- - Fix a denial of service bug where an attacker could use a
- malformed directory object to cause a Tor instance to pause while
- OpenSSL would try to read a passphrase from the terminal. (Tor
- instances run without a terminal, which is the case for most Tor
- packages, are not impacted.) Fixes bug 24246; bugfix on every
- version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
- Found by OSS-Fuzz as testcase 6360145429790720.
- o Major bugfixes (security, directory authority):
- - Fix a denial of service issue where an attacker could crash a
- directory authority using a malformed router descriptor. Fixes bug
- 24245; bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2017-010
- and CVE-2017-8820.
- o Major bugfixes (security, onion service v2):
- - Fix a use-after-free error that could crash v2 Tor onion services
- when they failed to open circuits while expiring introduction
- points. Fixes bug 24313; bugfix on 0.2.7.2-alpha. This issue is
- also tracked as TROVE-2017-013 and CVE-2017-8823.
- - When checking for replays in the INTRODUCE1 cell data for a
- (legacy) onion service, correctly detect replays in the RSA-
- encrypted part of the cell. We were previously checking for
- replays on the entire cell, but those can be circumvented due to
- the malleability of Tor's legacy hybrid encryption. This fix helps
- prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
- 0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
- and CVE-2017-8819.
- o Major bugfixes (security, relay):
- - When running as a relay, make sure that we never build a path
- through ourselves, even in the case where we have somehow lost the
- version of our descriptor appearing in the consensus. Fixes part
- of bug 21534; bugfix on 0.2.0.1-alpha. This issue is also tracked
- as TROVE-2017-012 and CVE-2017-8822.
- - When running as a relay, make sure that we never choose ourselves
- as a guard. Fixes part of bug 21534; bugfix on 0.3.0.1-alpha. This
- issue is also tracked as TROVE-2017-012 and CVE-2017-8822.
- o Major bugfixes (bootstrapping):
- - Fetch descriptors aggressively whenever we lack enough to build
- circuits, regardless of how many descriptors we are missing.
- Previously, we would delay launching the fetch when we had fewer
- than 15 missing descriptors, even if some of those descriptors
- were blocking circuits from building. Fixes bug 23985; bugfix on
- 0.1.1.11-alpha. The effects of this bug became worse in
- 0.3.0.3-alpha, when we began treating missing descriptors from our
- primary guards as a reason to delay circuits.
- - Don't try fetching microdescriptors from relays that have failed
- to deliver them in the past. Fixes bug 23817; bugfix
- on 0.3.0.1-alpha.
- o Major bugfixes (circuit prediction):
- - Fix circuit prediction logic so that a client doesn't treat a port
- as being "handled" by a circuit if that circuit already has
- isolation settings on it. This change should make Tor clients more
- responsive by improving their chances of having a pre-created
- circuit ready for use when a request arrives. Fixes bug 18859;
- bugfix on 0.2.3.3-alpha.
- o Major bugfixes (exit relays, DNS):
- - Fix an issue causing DNS to fail on high-bandwidth exit nodes,
- making them nearly unusable. Fixes bugs 21394 and 18580; bugfix on
- 0.1.2.2-alpha, which introduced eventdns. Thanks to Dhalgren for
- identifying and finding a workaround to this bug and to Moritz,
- Arthur Edelstein, and Roger for helping to track it down and
- analyze it.
- o Major bugfixes (relay, crash, assertion failure):
- - Fix a timing-based assertion failure that could occur when the
- circuit out-of-memory handler freed a connection's output buffer.
- Fixes bug 23690; bugfix on 0.2.6.1-alpha.
- o Major bugfixes (usability, control port):
- - Report trusted clock skew indications as bootstrap errors, so
- controllers can more easily alert users when their clocks are
- wrong. Fixes bug 23506; bugfix on 0.1.2.6-alpha.
- o Minor features (bridge):
- - Bridge relays can now set the BridgeDistribution config option to
- add a "bridge-distribution-request" line to their bridge
- descriptor, which tells BridgeDB how they'd like their bridge
- address to be given out. (Note that as of Oct 2017, BridgeDB does
- not yet implement this feature.) As a side benefit, this feature
- provides a way to distinguish bridge descriptors from non-bridge
- descriptors. Implements tickets 18329.
- - When handling the USERADDR command on an ExtOrPort, warn when the
- transports provides a USERADDR with no port. In a future version,
- USERADDR commands of this format may be rejected. Detects problems
- related to ticket 23080.
- o Minor features (bug detection):
- - Log a warning message with a stack trace for any attempt to call
- get_options() during option validation. This pattern has caused
- subtle bugs in the past. Closes ticket 22281.
- o Minor features (build, compilation):
- - The "check-changes" feature is now part of the "make check" tests;
- we'll use it to try to prevent misformed changes files from
- accumulating. Closes ticket 23564.
- - Tor builds should now fail if there are any mismatches between the
- C type representing a configuration variable and the C type the
- data-driven parser uses to store a value there. Previously, we
- needed to check these by hand, which sometimes led to mistakes.
- Closes ticket 23643.
- o Minor features (client):
- - You can now use Tor as a tunneled HTTP proxy: use the new
- HTTPTunnelPort option to open a port that accepts HTTP CONNECT
- requests. Closes ticket 22407.
- - Add an extra check to make sure that we always use the newer guard
- selection code for picking our guards. Closes ticket 22779.
- - When downloading (micro)descriptors, don't split the list into
- multiple requests unless we want at least 32 descriptors.
- Previously, we split at 4, not 32, which led to significant
- overhead in HTTP request size and degradation in compression
- performance. Closes ticket 23220.
- - Improve log messages when missing descriptors for primary guards.
- Resolves ticket 23670.
- o Minor features (command line):
- - Add a new commandline option, --key-expiration, which prints when
- the current signing key is going to expire. Implements ticket
- 17639; patch by Isis Lovecruft.
- o Minor features (control port):
- - If an application tries to use the control port as an HTTP proxy,
- respond with a meaningful "This is the Tor control port" message,
- and log the event. Closes ticket 1667. Patch from Ravi
- Chandra Padmala.
- - Provide better error message for GETINFO desc/(id|name) when not
- fetching router descriptors. Closes ticket 5847. Patch by
- Kevin Butler.
- - Add GETINFO "{desc,md}/download-enabled", to inform the controller
- whether Tor will try to download router descriptors and
- microdescriptors respectively. Closes ticket 22684.
- - Added new GETINFO targets "ip-to-country/{ipv4,ipv6}-available",
- so controllers can tell whether the geoip databases are loaded.
- Closes ticket 23237.
- - Adds a timestamp field to the CIRC_BW and STREAM_BW bandwidth
- events. Closes ticket 19254. Patch by "DonnchaC".
- o Minor features (development support):
- - Developers can now generate a call-graph for Tor using the
- "calltool" python program, which post-processes object dumps. It
- should work okay on many Linux and OSX platforms, and might work
- elsewhere too. To run it, install calltool from
- https://gitweb.torproject.org/user/nickm/calltool.git and run
- "make callgraph". Closes ticket 19307.
- o Minor features (directory authority):
- - Make the "Exit" flag assignment only depend on whether the exit
- policy allows connections to ports 80 and 443. Previously relays
- would get the Exit flag if they allowed connections to one of
- these ports and also port 6667. Resolves ticket 23637.
- o Minor features (ed25519):
- - Add validation function to checks for torsion components in
- ed25519 public keys, used by prop224 client-side code. Closes
- ticket 22006. Math help by Ian Goldberg.
- o Minor features (exit relay, DNS):
- - Improve the clarity and safety of the log message from evdns when
- receiving an apparently spoofed DNS reply. Closes ticket 3056.
- o Minor features (fallback directory mirrors):
- - The fallback directory list has been re-generated based on the
- current status of the network. Tor uses fallback directories to
- bootstrap when it doesn't yet have up-to-date directory
- information. Closes ticket 24801.
- - Make the default DirAuthorityFallbackRate 0.1, so that clients
- prefer to bootstrap from fallback directory mirrors. This is a
- follow-up to 24679, which removed weights from the default
- fallbacks. Implements ticket 24681.
- o Minor features (geoip):
- - Update geoip and geoip6 to the January 5 2018 Maxmind GeoLite2
- Country database.
- o Minor features (integration, hardening):
- - Add a new NoExec option to prevent Tor from running other
- programs. When this option is set to 1, Tor will never try to run
- another program, regardless of the settings of
- PortForwardingHelper, ClientTransportPlugin, or
- ServerTransportPlugin. Once NoExec is set, it cannot be disabled
- without restarting Tor. Closes ticket 22976.
- o Minor features (linux seccomp2 sandbox):
- - Update the sandbox rules so that they should now work correctly
- with Glibc 2.26. Closes ticket 24315.
- o Minor features (logging):
- - Provide better warnings when the getrandom() syscall fails. Closes
- ticket 24500.
- - Downgrade a pair of log messages that could occur when an exit's
- resolver gave us an unusual (but not forbidden) response. Closes
- ticket 24097.
- - Improve the message we log when re-enabling circuit build timeouts
- after having received a consensus. Closes ticket 20963.
- - Log more circuit information whenever we are about to try to
- package a relay cell on a circuit with a nonexistent n_chan.
- Attempt to diagnose ticket 8185.
- - Improve info-level log identification of particular circuits, to
- help with debugging. Closes ticket 23645.
- - Improve the warning message for specifying a relay by nickname.
- The previous message implied that nickname registration was still
- part of the Tor network design, which it isn't. Closes
- ticket 20488.
- - If the sandbox filter fails to load, suggest to the user that
- their kernel might not support seccomp2. Closes ticket 23090.
- o Minor features (onion service, circuit, logging):
- - Improve logging of many callsite in the circuit subsystem to print
- the circuit identifier(s).
- - Log when we cleanup an intro point from a service so we know when
- and for what reason it happened. Closes ticket 23604.
- o Minor features (portability):
- - Tor now compiles correctly on arm64 with libseccomp-dev installed.
- (It doesn't yet work with the sandbox enabled.) Closes
- ticket 24424.
- - Check at configure time whether uint8_t is the same type as
- unsigned char. Lots of existing code already makes this
- assumption, and there could be strict aliasing issues if the
- assumption is violated. Closes ticket 22410.
- o Minor features (relay):
- - When choosing which circuits can be expired as unused, consider
- circuits from clients even if those clients used regular CREATE
- cells to make them; and do not consider circuits from relays even
- if they were made with CREATE_FAST. Part of ticket 22805.
- - Reject attempts to use relative file paths when RunAsDaemon is
- set. Previously, Tor would accept these, but the directory-
- changing step of RunAsDaemon would give strange and/or confusing
- results. Closes ticket 22731.
- o Minor features (relay statistics):
- - Change relay bandwidth reporting stats interval from 4 hours to 24
- hours in order to reduce the efficiency of guard discovery
- attacks. Fixes ticket 23856.
- o Minor features (reverted deprecations):
- - The ClientDNSRejectInternalAddresses flag can once again be set in
- non-testing Tor networks, so long as they do not use the default
- directory authorities. This change also removes the deprecation of
- this flag from 0.2.9.2-alpha. Closes ticket 21031.
- o Minor features (robustness):
- - Change several fatal assertions when flushing buffers into non-
- fatal assertions, to prevent any recurrence of 23690.
- o Minor features (startup, safety):
- - When configured to write a PID file, Tor now exits if it is unable
- to do so. Previously, it would warn and continue. Closes
- ticket 20119.
- o Minor features (static analysis):
- - The BUG() macro has been changed slightly so that Coverity no
- longer complains about dead code if the bug is impossible. Closes
- ticket 23054.
- o Minor features (testing):
- - Our fuzzing tests now test the encrypted portions of v3 onion
- service descriptors. Implements more of 21509.
- - Add a unit test to make sure that our own generated platform
- string will be accepted by directory authorities. Closes
- ticket 22109.
- - The default chutney network tests now include tests for the v3
- onion service design. Make sure you have the latest version of
- chutney if you want to run these. Closes ticket 22437.
- - Add a unit test to verify that we can parse a hardcoded v2 onion
- service descriptor. Closes ticket 15554.
- o Minor bugfixes (address selection):
- - When the fascist_firewall_choose_address_ functions don't find a
- reachable address, set the returned address to the null address
- and port. This is a precautionary measure, because some callers do
- not check the return value. Fixes bug 24736; bugfix
- on 0.2.8.2-alpha.
- o Minor bugfixes (bootstrapping):
- - When warning about state file clock skew, report the correct
- direction for the detected skew. Fixes bug 23606; bugfix
- on 0.2.8.1-alpha.
- o Minor bugfixes (bridge clients, bootstrap):
- - Retry directory downloads when we get our first bridge descriptor
- during bootstrap or while reconnecting to the network. Keep
- retrying every time we get a bridge descriptor, until we have a
- reachable bridge. Fixes part of bug 24367; bugfix on 0.2.0.3-alpha.
- - Stop delaying bridge descriptor fetches when we have cached bridge
- descriptors. Instead, only delay bridge descriptor fetches when we
- have at least one reachable bridge. Fixes part of bug 24367;
- bugfix on 0.2.0.3-alpha.
- - Stop delaying directory fetches when we have cached bridge
- descriptors. Instead, only delay bridge descriptor fetches when
- all our bridges are definitely unreachable. Fixes part of bug
- 24367; bugfix on 0.2.0.3-alpha.
- o Minor bugfixes (bridge):
- - Overwrite the bridge address earlier in the process of retrieving
- its descriptor, to make sure we reach it on the configured
- address. Fixes bug 20532; bugfix on 0.2.0.10-alpha.
- o Minor bugfixes (build, compilation):
- - Fix a compilation warning when building with zstd support on
- 32-bit platforms. Fixes bug 23568; bugfix on 0.3.1.1-alpha. Found
- and fixed by Andreas Stieger.
- - When searching for OpenSSL, don't accept any OpenSSL library that
- lacks TLSv1_1_method(): Tor doesn't build with those versions.
- Additionally, look in /usr/local/opt/openssl, if it's present.
- These changes together repair the default build on OSX systems
- with Homebrew installed. Fixes bug 23602; bugfix on 0.2.7.2-alpha.
- - Fix a signed/unsigned comparison warning introduced by our fix to
- TROVE-2017-009. Fixes bug 24480; bugfix on 0.2.5.16.
- - Fix a memory leak warning in one of the libevent-related
- configuration tests that could occur when manually specifying
- -fsanitize=address. Fixes bug 24279; bugfix on 0.3.0.2-alpha.
- Found and patched by Alex Xu.
- - Fix unused-variable warnings in donna's Curve25519 SSE2 code.
- Fixes bug 22895; bugfix on 0.2.7.2-alpha.
- o Minor bugfixes (certificate handling):
- - Fix a time handling bug in Tor certificates set to expire after
- the year 2106. Fixes bug 23055; bugfix on 0.3.0.1-alpha. Found by
- Coverity as CID 1415728.
- o Minor bugfixes (client):
- - By default, do not enable storage of client-side DNS values. These
- values were unused by default previously, but they should not have
- been cached at all. Fixes bug 24050; bugfix on 0.2.6.3-alpha.
- o Minor bugfixes (client, usability):
- - Refrain from needlessly rejecting SOCKS5-with-hostnames and
- SOCKS4a requests that contain IP address strings, even when
- SafeSocks in enabled, as this prevents user from connecting to
- known IP addresses without relying on DNS for resolving. SafeSocks
- still rejects SOCKS connections that connect to IP addresses when
- those addresses are _not_ encoded as hostnames. Fixes bug 22461;
- bugfix on Tor 0.2.6.2-alpha.
- o Minor bugfixes (code correctness):
- - Call htons() in extend_cell_format() for encoding a 16-bit value.
- Previously we used ntohs(), which happens to behave the same on
- all the platforms we support, but which isn't really correct.
- Fixes bug 23106; bugfix on 0.2.4.8-alpha.
- - For defense-in-depth, make the controller's write_escaped_data()
- function robust to extremely long inputs. Fixes bug 19281; bugfix
- on 0.1.1.1-alpha. Reported by Guido Vranken.
- - Fix several places in our codebase where a C compiler would be
- likely to eliminate a check, based on assuming that undefined
- behavior had not happened elsewhere in the code. These cases are
- usually a sign of redundant checking or dubious arithmetic. Found
- by Georg Koppen using the "STACK" tool from Wang, Zeldovich,
- Kaashoek, and Solar-Lezama. Fixes bug 24423; bugfix on various
- Tor versions.
- o Minor bugfixes (compression):
- - Handle a pathological case when decompressing Zstandard data when
- the output buffer size is zero. Fixes bug 23551; bugfix
- on 0.3.1.1-alpha.
- o Minor bugfixes (consensus expiry):
- - Check for adequate directory information correctly. Previously, Tor
- would reconsider whether it had sufficient directory information
- every 2 minutes. Fixes bug 23091; bugfix on 0.2.0.19-alpha.
- o Minor bugfixes (control port, linux seccomp2 sandbox):
- - Avoid a crash when attempting to use the seccomp2 sandbox together
- with the OwningControllerProcess feature. Fixes bug 24198; bugfix
- on 0.2.5.1-alpha.
- o Minor bugfixes (control port, onion services):
- - Report "FAILED" instead of "UPLOAD_FAILED" "FAILED" for the
- HS_DESC event when a service is not able to upload a descriptor.
- Fixes bug 24230; bugfix on 0.2.7.1-alpha.
- o Minor bugfixes (directory cache):
- - Recover better from empty or corrupt files in the consensus cache
- directory. Fixes bug 24099; bugfix on 0.3.1.1-alpha.
- - When a consensus diff calculation is only partially successful,
- only record the successful parts as having succeeded. Partial
- success can happen if (for example) one compression method fails
- but the others succeed. Previously we misrecorded all the
- calculations as having succeeded, which would later cause a
- nonfatal assertion failure. Fixes bug 24086; bugfix
- on 0.3.1.1-alpha.
- o Minor bugfixes (directory client):
- - On failure to download directory information, delay retry attempts
- by a random amount based on the "decorrelated jitter" algorithm.
- Our previous delay algorithm tended to produce extra-long delays
- too easily. Fixes bug 23816; bugfix on 0.2.9.1-alpha.
- o Minor bugfixes (directory protocol):
- - Directory servers now include a "Date:" http header for response
- codes other than 200. Clients starting with a skewed clock and a
- recent consensus were getting "304 Not modified" responses from
- directory authorities, so without the Date header, the client
- would never hear about a wrong clock. Fixes bug 23499; bugfix
- on 0.0.8rc1.
- - Make clients wait for 6 seconds before trying to download a
- consensus from an authority. Fixes bug 17750; bugfix
- on 0.2.8.1-alpha.
- o Minor bugfixes (documentation):
- - Document better how to read gcov, and what our gcov postprocessing
- scripts do. Fixes bug 23739; bugfix on 0.2.9.1-alpha.
- - Fix manpage to not refer to the obsolete (and misspelled)
- UseEntryGuardsAsDirectoryGuards parameter in the description of
- NumDirectoryGuards. Fixes bug 23611; bugfix on 0.2.4.8-alpha.
- o Minor bugfixes (DoS-resistance):
- - If future code asks if there are any running bridges, without
- checking if bridges are enabled, log a BUG warning rather than
- crashing. Fixes bug 23524; bugfix on 0.3.0.1-alpha.
- o Minor bugfixes (entry guards):
- - Tor now updates its guard state when it reads a consensus
- regardless of whether it's missing descriptors. That makes tor use
- its primary guards to fetch descriptors in some edge cases where
- it would previously have used fallback directories. Fixes bug
- 23862; bugfix on 0.3.0.1-alpha.
- o Minor bugfixes (format strictness):
- - Restrict several data formats to decimal. Previously, the
- BuildTimeHistogram entries in the state file, the "bw=" entries in
- the bandwidth authority file, and the process IDs passed to the
- __OwningControllerProcess option could all be specified in hex or
- octal as well as in decimal. This was not an intentional feature.
- Fixes bug 22802; bugfixes on 0.2.2.1-alpha, 0.2.2.2-alpha,
- and 0.2.2.28-beta.
- o Minor bugfixes (heartbeat):
- - If we fail to write a heartbeat message, schedule a retry for the
- minimum heartbeat interval number of seconds in the future. Fixes
- bug 19476; bugfix on 0.2.3.1-alpha.
- o Minor bugfixes (logging):
- - Suppress a log notice when relay descriptors arrive. We already
- have a bootstrap progress for this so no need to log notice
- everytime tor receives relay descriptors. Microdescriptors behave
- the same. Fixes bug 23861; bugfix on 0.2.8.2-alpha.
- - Remove duplicate log messages regarding opening non-local
- SocksPorts upon parsing config and opening listeners at startup.
- Fixes bug 4019; bugfix on 0.2.3.3-alpha.
- - Use a more comprehensible log message when telling the user
- they've excluded every running exit node. Fixes bug 7890; bugfix
- on 0.2.2.25-alpha.
- - When logging the number of descriptors we intend to download per
- directory request, do not log a number higher than then the number
- of descriptors we're fetching in total. Fixes bug 19648; bugfix
- on 0.1.1.8-alpha.
- - When warning about a directory owned by the wrong user, log the
- actual name of the user owning the directory. Previously, we'd log
- the name of the process owner twice. Fixes bug 23487; bugfix
- on 0.2.9.1-alpha.
- - Fix some messages on unexpected errors from the seccomp2 library.
- Fixes bug 22750; bugfix on 0.2.5.1-alpha. Patch from "cypherpunks".
- - The tor specification says hop counts are 1-based, so fix two log
- messages that mistakenly logged 0-based hop counts. Fixes bug
- 18982; bugfix on 0.2.6.2-alpha and 0.2.4.5-alpha. Patch by teor.
- Credit to Xiaofan Li for reporting this issue.
- o Minor bugfixes (logging, relay shutdown, annoyance):
- - When a circuit is marked for close, do not attempt to package any
- cells for channels on that circuit. Previously, we would detect
- this condition lower in the call stack, when we noticed that the
- circuit had no attached channel, and log an annoying message.
- Fixes bug 8185; bugfix on 0.2.5.4-alpha.
- o Minor bugfixes (memory safety, defensive programming):
- - Clear the target address when node_get_prim_orport() returns
- early. Fixes bug 23874; bugfix on 0.2.8.2-alpha.
- o Minor bugfixes (memory usage):
- - When queuing DESTROY cells on a channel, only queue the circuit-id
- and reason fields: not the entire 514-byte cell. This fix should
- help mitigate any bugs or attacks that fill up these queues, and
- free more RAM for other uses. Fixes bug 24666; bugfix
- on 0.2.5.1-alpha.
- o Minor bugfixes (network layer):
- - When closing a connection via close_connection_immediately(), we
- mark it as "not blocked on bandwidth", to prevent later calls from
- trying to unblock it, and give it permission to read. This fixes a
- backtrace warning that can happen on relays under various
- circumstances. Fixes bug 24167; bugfix on 0.1.0.1-rc.
- o Minor bugfixes (onion services):
- - The introduction circuit was being timed out too quickly while
- waiting for the rendezvous circuit to complete. Keep the intro
- circuit around longer instead of timing out and reopening new ones
- constantly. Fixes bug 23681; bugfix on 0.2.4.8-alpha.
- - Rename the consensus parameter "hsdir-interval" to "hsdir_interval"
- so it matches dir-spec.txt. Fixes bug 24262; bugfix
- on 0.3.1.1-alpha.
- - When handling multiple SOCKS request for the same .onion address,
- only fetch the service descriptor once.
- - Avoid a possible double close of a circuit by the intro point on
- error of sending the INTRO_ESTABLISHED cell. Fixes bug 23610;
- bugfix on 0.3.0.1-alpha.
- - When reloading configured onion services, copy all information
- from the old service object. Previously, some data was omitted,
- causing delays in descriptor upload, and other bugs. Fixes bug
- 23790; bugfix on 0.2.1.9-alpha.
- o Minor bugfixes (path selection):
- - When selecting relays by bandwidth, avoid a rounding error that
- could sometimes cause load to be imbalanced incorrectly.
- Previously, we would always round upwards; now, we round towards
- the nearest integer. This had the biggest effect when a relay's
- weight adjustments should have given it weight 0, but it got
- weight 1 instead. Fixes bug 23318; bugfix on 0.2.4.3-alpha.
- - When calculating the fraction of nodes that have descriptors, and
- all nodes in the network have zero bandwidths, count the number of
- nodes instead. Fixes bug 23318; bugfix on 0.2.4.10-alpha.
- - Actually log the total bandwidth in compute_weighted_bandwidths().
- Fixes bug 24170; bugfix on 0.2.4.3-alpha.
- o Minor bugfixes (portability):
- - Stop using the PATH_MAX variable, which is not defined on GNU
- Hurd. Fixes bug 23098; bugfix on 0.3.1.1-alpha.
- - Fix a bug in the bit-counting parts of our timing-wheel code on
- MSVC. (Note that MSVC is still not a supported build platform, due
- to cryptographic timing channel risks.) Fixes bug 24633; bugfix
- on 0.2.9.1-alpha.
- o Minor bugfixes (relay):
- - When uploading our descriptor for the first time after startup,
- report the reason for uploading as "Tor just started" rather than
- leaving it blank. Fixes bug 22885; bugfix on 0.2.3.4-alpha.
- - Avoid unnecessary calls to directory_fetches_from_authorities() on
- relays, to prevent spurious address resolutions and descriptor
- rebuilds. This is a mitigation for bug 21789. Fixes bug 23470;
- bugfix on in 0.2.8.1-alpha.
- - Avoid a crash when transitioning from client mode to bridge mode.
- Previously, we would launch the worker threads whenever our
- "public server" mode changed, but not when our "server" mode
- changed. Fixes bug 23693; bugfix on 0.2.6.3-alpha.
- o Minor bugfixes (testing):
- - Fix a spurious fuzzing-only use of an uninitialized value. Found
- by Brian Carpenter. Fixes bug 24082; bugfix on 0.3.0.3-alpha.
- - Test that IPv6-only clients can use microdescriptors when running
- "make test-network-all". Requires chutney master 61c28b9 or later.
- Closes ticket 24109.
- - Prevent scripts/test/coverage from attempting to move gcov output
- to the root directory. Fixes bug 23741; bugfix on 0.2.5.1-alpha.
- - Capture and detect several "Result does not fit" warnings in unit
- tests on platforms with 32-bit time_t. Fixes bug 21800; bugfix
- on 0.2.9.3-alpha.
- - Fix additional channelpadding unit test failures by using mocked
- time instead of actual time for all tests. Fixes bug 23608; bugfix
- on 0.3.1.1-alpha.
- - Fix a bug in our fuzzing mock replacement for crypto_pk_checksig(),
- to correctly handle cases where a caller gives it an RSA key of
- under 160 bits. (This is not actually a bug in Tor itself, but
- rather in our fuzzing code.) Fixes bug 24247; bugfix on
- 0.3.0.3-alpha. Found by OSS-Fuzz as issue 4177.
- - Fix a broken unit test for the OutboundAddress option: the parsing
- function was never returning an error on failure. Fixes bug 23366;
- bugfix on 0.3.0.3-alpha.
- - Fix a signed-integer overflow in the unit tests for
- dir/download_status_random_backoff, which was untriggered until we
- fixed bug 17750. Fixes bug 22924; bugfix on 0.2.9.1-alpha.
- o Minor bugfixes (usability, control port):
- - Stop making an unnecessary routerlist check in NETINFO clock skew
- detection; this was preventing clients from reporting NETINFO clock
- skew to controllers. Fixes bug 23532; bugfix on 0.2.4.4-alpha.
- o Code simplification and refactoring:
- - Remove various ways of testing circuits and connections for
- "clientness"; instead, favor channel_is_client(). Part of
- ticket 22805.
- - Extract the code for handling newly-open channels into a separate
- function from the general code to handle channel state
- transitions. This change simplifies our callgraph, reducing the
- size of the largest strongly connected component by roughly a
- factor of two. Closes ticket 22608.
- - Remove dead code for largely unused statistics on the number of
- times we've attempted various public key operations. Fixes bug
- 19871; bugfix on 0.1.2.4-alpha. Fix by Isis Lovecruft.
- - Remove several now-obsolete functions for asking about old
- variants directory authority status. Closes ticket 22311; patch
- from "huyvq".
- - Remove some of the code that once supported "Named" and "Unnamed"
- routers. Authorities no longer vote for these flags. Closes
- ticket 22215.
- - Rename the obsolete malleable hybrid_encrypt functions used in TAP
- and old hidden services, to indicate that they aren't suitable for
- new protocols or formats. Closes ticket 23026.
- - Replace our STRUCT_OFFSET() macro with offsetof(). Closes ticket
- 22521. Patch from Neel Chauhan.
- - Split the enormous circuit_send_next_onion_skin() function into
- multiple subfunctions. Closes ticket 22804.
- - Split the portions of the buffer.c module that handle particular
- protocols into separate modules. Part of ticket 23149.
- - Use our test macros more consistently, to produce more useful
- error messages when our unit tests fail. Add coccinelle patches to
- allow us to re-check for test macro uses. Closes ticket 22497.
- o Deprecated features:
- - The ReachableDirAddresses and ClientPreferIPv6DirPort options are
- now deprecated; they do not apply to relays, and they have had no
- effect on clients since 0.2.8.x. Closes ticket 19704.
- - Deprecate HTTPProxy/HTTPProxyAuthenticator config options. They
- only applies to direct unencrypted HTTP connections to your
- directory server, which your Tor probably isn't using. Closes
- ticket 20575.
- o Documentation:
- - Add notes in man page regarding OS support for the various
- scheduler types. Attempt to use less jargon in the scheduler
- section. Closes ticket 24254.
- - Clarify that the Address option is entirely about setting an
- advertised IPv4 address. Closes ticket 18891.
- - Clarify the manpage's use of the term "address" to clarify what
- kind of address is intended. Closes ticket 21405.
- - Document that onion service subdomains are allowed, and ignored.
- Closes ticket 18736.
- - Clarify in the manual that "Sandbox 1" is only supported on Linux
- kernels. Closes ticket 22677.
- - Document all values of PublishServerDescriptor in the manpage.
- Closes ticket 15645.
- - Improve the documentation for the directory port part of the
- DirAuthority line. Closes ticket 20152.
- - Restore documentation for the authorities' "approved-routers"
- file. Closes ticket 21148.
- o Removed features:
- - The AllowDotExit option has been removed as unsafe. It has been
- deprecated since 0.2.9.2-alpha. Closes ticket 23426.
- - The ClientDNSRejectInternalAddresses flag can no longer be set on
- non-testing networks. It has been deprecated since 0.2.9.2-alpha.
- Closes ticket 21031.
- - The controller API no longer includes an AUTHDIR_NEWDESCS event:
- nobody was using it any longer. Closes ticket 22377.
- Changes in version 0.3.1.9 - 2017-12-01:
- Tor 0.3.1.9 backports important security and stability fixes from the
- 0.3.2 development series. All Tor users should upgrade to this
- release, or to another of the releases coming out today.
- o Major bugfixes (security, backport from 0.3.2.6-alpha):
- - Fix a denial of service bug where an attacker could use a
- malformed directory object to cause a Tor instance to pause while
- OpenSSL would try to read a passphrase from the terminal. (Tor
- instances run without a terminal, which is the case for most Tor
- packages, are not impacted.) Fixes bug 24246; bugfix on every
- version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
- Found by OSS-Fuzz as testcase 6360145429790720.
- - Fix a denial of service issue where an attacker could crash a
- directory authority using a malformed router descriptor. Fixes bug
- 24245; bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2017-010
- and CVE-2017-8820.
- - When checking for replays in the INTRODUCE1 cell data for a
- (legacy) onion service, correctly detect replays in the RSA-
- encrypted part of the cell. We were previously checking for
- replays on the entire cell, but those can be circumvented due to
- the malleability of Tor's legacy hybrid encryption. This fix helps
- prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
- 0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
- and CVE-2017-8819.
- o Major bugfixes (security, onion service v2, backport from 0.3.2.6-alpha):
- - Fix a use-after-free error that could crash v2 Tor onion services
- when they failed to open circuits while expiring introduction
- points. Fixes bug 24313; bugfix on 0.2.7.2-alpha. This issue is
- also tracked as TROVE-2017-013 and CVE-2017-8823.
- o Major bugfixes (security, relay, backport from 0.3.2.6-alpha):
- - When running as a relay, make sure that we never build a path
- through ourselves, even in the case where we have somehow lost the
- version of our descriptor appearing in the consensus. Fixes part
- of bug 21534; bugfix on 0.2.0.1-alpha. This issue is also tracked
- as TROVE-2017-012 and CVE-2017-8822.
- - When running as a relay, make sure that we never choose ourselves
- as a guard. Fixes part of bug 21534; bugfix on 0.3.0.1-alpha. This
- issue is also tracked as TROVE-2017-012 and CVE-2017-8822.
- o Major bugfixes (exit relays, DNS, backport from 0.3.2.4-alpha):
- - Fix an issue causing DNS to fail on high-bandwidth exit nodes,
- making them nearly unusable. Fixes bugs 21394 and 18580; bugfix on
- 0.1.2.2-alpha, which introduced eventdns. Thanks to Dhalgren for
- identifying and finding a workaround to this bug and to Moritz,
- Arthur Edelstein, and Roger for helping to track it down and
- analyze it.
- o Minor features (bridge):
- - Bridges now include notice in their descriptors that they are
- bridges, and notice of their distribution status, based on their
- publication settings. Implements ticket 18329. For more fine-
- grained control of how a bridge is distributed, upgrade to 0.3.2.x
- or later.
- o Minor features (directory authority, backport from 0.3.2.6-alpha):
- - Add an IPv6 address for the "bastet" directory authority. Closes
- ticket 24394.
- o Minor features (geoip):
- - Update geoip and geoip6 to the November 6 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfix (relay address resolution, backport from 0.3.2.1-alpha):
- - Avoid unnecessary calls to directory_fetches_from_authorities() on
- relays, to prevent spurious address resolutions and descriptor
- rebuilds. This is a mitigation for bug 21789. Fixes bug 23470;
- bugfix on in 0.2.8.1-alpha.
- o Minor bugfixes (compilation, backport from 0.3.2.1-alpha):
- - Fix unused variable warnings in donna's Curve25519 SSE2 code.
- Fixes bug 22895; bugfix on 0.2.7.2-alpha.
- o Minor bugfixes (logging, relay shutdown, annoyance, backport from 0.3.2.2-alpha):
- - When a circuit is marked for close, do not attempt to package any
- cells for channels on that circuit. Previously, we would detect
- this condition lower in the call stack, when we noticed that the
- circuit had no attached channel, and log an annoying message.
- Fixes bug 8185; bugfix on 0.2.5.4-alpha.
- o Minor bugfixes (onion service, backport from 0.3.2.5-alpha):
- - Rename the consensus parameter "hsdir-interval" to "hsdir_interval"
- so it matches dir-spec.txt. Fixes bug 24262; bugfix
- on 0.3.1.1-alpha.
- o Minor bugfixes (relay, crash, backport from 0.3.2.4-alpha):
- - Avoid a crash when transitioning from client mode to bridge mode.
- Previously, we would launch the worker threads whenever our
- "public server" mode changed, but not when our "server" mode
- changed. Fixes bug 23693; bugfix on 0.2.6.3-alpha.
- Changes in version 0.3.0.13 - 2017-12-01
- Tor 0.3.0.13 backports important security and stability bugfixes from
- later Tor releases. All Tor users should upgrade to this release, or
- to another of the releases coming out today.
- Note: the Tor 0.3.0 series will no longer be supported after 26 Jan
- 2018. If you need a release with long-term support, please stick with
- the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
- o Major bugfixes (security, backport from 0.3.2.6-alpha):
- - Fix a denial of service bug where an attacker could use a
- malformed directory object to cause a Tor instance to pause while
- OpenSSL would try to read a passphrase from the terminal. (Tor
- instances run without a terminal, which is the case for most Tor
- packages, are not impacted.) Fixes bug 24246; bugfix on every
- version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
- Found by OSS-Fuzz as testcase 6360145429790720.
- - Fix a denial of service issue where an attacker could crash a
- directory authority using a malformed router descriptor. Fixes bug
- 24245; bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2017-010
- and CVE-2017-8820.
- - When checking for replays in the INTRODUCE1 cell data for a
- (legacy) onion service, correctly detect replays in the RSA-
- encrypted part of the cell. We were previously checking for
- replays on the entire cell, but those can be circumvented due to
- the malleability of Tor's legacy hybrid encryption. This fix helps
- prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
- 0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
- and CVE-2017-8819.
- o Major bugfixes (security, onion service v2, backport from 0.3.2.6-alpha):
- - Fix a use-after-free error that could crash v2 Tor onion services
- when they failed to open circuits while expiring introduction
- points. Fixes bug 24313; bugfix on 0.2.7.2-alpha. This issue is
- also tracked as TROVE-2017-013 and CVE-2017-8823.
- o Major bugfixes (security, relay, backport from 0.3.2.6-alpha):
- - When running as a relay, make sure that we never build a path
- through ourselves, even in the case where we have somehow lost the
- version of our descriptor appearing in the consensus. Fixes part
- of bug 21534; bugfix on 0.2.0.1-alpha. This issue is also tracked
- as TROVE-2017-012 and CVE-2017-8822.
- - When running as a relay, make sure that we never choose ourselves
- as a guard. Fixes part of bug 21534; bugfix on 0.3.0.1-alpha. This
- issue is also tracked as TROVE-2017-012 and CVE-2017-8822.
- o Major bugfixes (exit relays, DNS, backport from 0.3.2.4-alpha):
- - Fix an issue causing DNS to fail on high-bandwidth exit nodes,
- making them nearly unusable. Fixes bugs 21394 and 18580; bugfix on
- 0.1.2.2-alpha, which introduced eventdns. Thanks to Dhalgren for
- identifying and finding a workaround to this bug and to Moritz,
- Arthur Edelstein, and Roger for helping to track it down and
- analyze it.
- o Minor features (security, windows, backport from 0.3.1.1-alpha):
- - Enable a couple of pieces of Windows hardening: one
- (HeapEnableTerminationOnCorruption) that has been on-by-default
- since Windows 8, and unavailable before Windows 7; and one
- (PROCESS_DEP_DISABLE_ATL_THUNK_EMULATION) which we believe doesn't
- affect us, but shouldn't do any harm. Closes ticket 21953.
- o Minor features (bridge, backport from 0.3.1.9):
- - Bridges now include notice in their descriptors that they are
- bridges, and notice of their distribution status, based on their
- publication settings. Implements ticket 18329. For more fine-
- grained control of how a bridge is distributed, upgrade to 0.3.2.x
- or later.
- o Minor features (directory authority, backport from 0.3.2.6-alpha):
- - Add an IPv6 address for the "bastet" directory authority. Closes
- ticket 24394.
- o Minor features (geoip):
- - Update geoip and geoip6 to the November 6 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfix (relay address resolution, backport from 0.3.2.1-alpha):
- - Avoid unnecessary calls to directory_fetches_from_authorities() on
- relays, to prevent spurious address resolutions and descriptor
- rebuilds. This is a mitigation for bug 21789. Fixes bug 23470;
- bugfix on in 0.2.8.1-alpha.
- o Minor bugfixes (compilation, backport from 0.3.2.1-alpha):
- - Fix unused variable warnings in donna's Curve25519 SSE2 code.
- Fixes bug 22895; bugfix on 0.2.7.2-alpha.
- o Minor bugfixes (logging, relay shutdown, annoyance, backport from 0.3.2.2-alpha):
- - When a circuit is marked for close, do not attempt to package any
- cells for channels on that circuit. Previously, we would detect
- this condition lower in the call stack, when we noticed that the
- circuit had no attached channel, and log an annoying message.
- Fixes bug 8185; bugfix on 0.2.5.4-alpha.
- o Minor bugfixes (relay, crash, backport from 0.3.2.4-alpha):
- - Avoid a crash when transitioning from client mode to bridge mode.
- Previously, we would launch the worker threads whenever our
- "public server" mode changed, but not when our "server" mode
- changed. Fixes bug 23693; bugfix on 0.2.6.3-alpha.
- o Minor bugfixes (testing, backport from 0.3.1.6-rc):
- - Fix an undersized buffer in test-memwipe.c. Fixes bug 23291;
- bugfix on 0.2.7.2-alpha. Found and patched by Ties Stuij.
- Changes in version 0.2.9.14 - 2017-12-01
- Tor 0.3.0.13 backports important security and stability bugfixes from
- later Tor releases. All Tor users should upgrade to this release, or
- to another of the releases coming out today.
- o Major bugfixes (exit relays, DNS, backport from 0.3.2.4-alpha):
- - Fix an issue causing DNS to fail on high-bandwidth exit nodes,
- making them nearly unusable. Fixes bugs 21394 and 18580; bugfix on
- 0.1.2.2-alpha, which introduced eventdns. Thanks to Dhalgren for
- identifying and finding a workaround to this bug and to Moritz,
- Arthur Edelstein, and Roger for helping to track it down and
- analyze it.
- o Major bugfixes (security, backport from 0.3.2.6-alpha):
- - Fix a denial of service bug where an attacker could use a
- malformed directory object to cause a Tor instance to pause while
- OpenSSL would try to read a passphrase from the terminal. (Tor
- instances run without a terminal, which is the case for most Tor
- packages, are not impacted.) Fixes bug 24246; bugfix on every
- version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
- Found by OSS-Fuzz as testcase 6360145429790720.
- - Fix a denial of service issue where an attacker could crash a
- directory authority using a malformed router descriptor. Fixes bug
- 24245; bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2017-010
- and CVE-2017-8820.
- - When checking for replays in the INTRODUCE1 cell data for a
- (legacy) onion service, correctly detect replays in the RSA-
- encrypted part of the cell. We were previously checking for
- replays on the entire cell, but those can be circumvented due to
- the malleability of Tor's legacy hybrid encryption. This fix helps
- prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
- 0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
- and CVE-2017-8819.
- o Major bugfixes (security, onion service v2, backport from 0.3.2.6-alpha):
- - Fix a use-after-free error that could crash v2 Tor onion services
- when they failed to open circuits while expiring introduction
- points. Fixes bug 24313; bugfix on 0.2.7.2-alpha. This issue is
- also tracked as TROVE-2017-013 and CVE-2017-8823.
- o Major bugfixes (security, relay, backport from 0.3.2.6-alpha):
- - When running as a relay, make sure that we never build a path
- through ourselves, even in the case where we have somehow lost the
- version of our descriptor appearing in the consensus. Fixes part
- of bug 21534; bugfix on 0.2.0.1-alpha. This issue is also tracked
- as TROVE-2017-012 and CVE-2017-8822.
- o Minor features (bridge, backport from 0.3.1.9):
- - Bridges now include notice in their descriptors that they are
- bridges, and notice of their distribution status, based on their
- publication settings. Implements ticket 18329. For more fine-
- grained control of how a bridge is distributed, upgrade to 0.3.2.x
- or later.
- o Minor features (directory authority, backport from 0.3.2.6-alpha):
- - Add an IPv6 address for the "bastet" directory authority. Closes
- ticket 24394.
- o Minor features (geoip):
- - Update geoip and geoip6 to the November 6 2017 Maxmind GeoLite2
- Country database.
- o Minor features (security, windows, backport from 0.3.1.1-alpha):
- - Enable a couple of pieces of Windows hardening: one
- (HeapEnableTerminationOnCorruption) that has been on-by-default
- since Windows 8, and unavailable before Windows 7; and one
- (PROCESS_DEP_DISABLE_ATL_THUNK_EMULATION) which we believe doesn't
- affect us, but shouldn't do any harm. Closes ticket 21953.
- o Minor bugfix (relay address resolution, backport from 0.3.2.1-alpha):
- - Avoid unnecessary calls to directory_fetches_from_authorities() on
- relays, to prevent spurious address resolutions and descriptor
- rebuilds. This is a mitigation for bug 21789. Fixes bug 23470;
- bugfix on in 0.2.8.1-alpha.
- o Minor bugfixes (compilation, backport from 0.3.2.1-alpha):
- - Fix unused variable warnings in donna's Curve25519 SSE2 code.
- Fixes bug 22895; bugfix on 0.2.7.2-alpha.
- o Minor bugfixes (logging, relay shutdown, annoyance, backport from 0.3.2.2-alpha):
- - When a circuit is marked for close, do not attempt to package any
- cells for channels on that circuit. Previously, we would detect
- this condition lower in the call stack, when we noticed that the
- circuit had no attached channel, and log an annoying message.
- Fixes bug 8185; bugfix on 0.2.5.4-alpha.
- o Minor bugfixes (relay, crash, backport from 0.3.2.4-alpha):
- - Avoid a crash when transitioning from client mode to bridge mode.
- Previously, we would launch the worker threads whenever our
- "public server" mode changed, but not when our "server" mode
- changed. Fixes bug 23693; bugfix on 0.2.6.3-alpha.
- o Minor bugfixes (testing, backport from 0.3.1.6-rc):
- - Fix an undersized buffer in test-memwipe.c. Fixes bug 23291;
- bugfix on 0.2.7.2-alpha. Found and patched by Ties Stuij.
- Changes in version 0.2.8.17 - 2017-12-01
- Tor 0.2.8.17 backports important security and stability bugfixes from
- later Tor releases. All Tor users should upgrade to this release, or
- to another of the releases coming out today.
- Note: the Tor 0.2.8 series will no longer be supported after 1 Jan
- 2018. If you need a release with long-term support, please upgrade with
- the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
- o Major bugfixes (security, backport from 0.3.2.6-alpha):
- - Fix a denial of service bug where an attacker could use a
- malformed directory object to cause a Tor instance to pause while
- OpenSSL would try to read a passphrase from the terminal. (Tor
- instances run without a terminal, which is the case for most Tor
- packages, are not impacted.) Fixes bug 24246; bugfix on every
- version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
- Found by OSS-Fuzz as testcase 6360145429790720.
- - When checking for replays in the INTRODUCE1 cell data for a
- (legacy) onion service, correctly detect replays in the RSA-
- encrypted part of the cell. We were previously checking for
- replays on the entire cell, but those can be circumvented due to
- the malleability of Tor's legacy hybrid encryption. This fix helps
- prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
- 0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
- and CVE-2017-8819.
- o Major bugfixes (security, onion service v2, backport from 0.3.2.6-alpha):
- - Fix a use-after-free error that could crash v2 Tor onion services
- when they failed to open circuits while expiring introduction
- points. Fixes bug 24313; bugfix on 0.2.7.2-alpha. This issue is
- also tracked as TROVE-2017-013 and CVE-2017-8823.
- o Major bugfixes (security, relay, backport from 0.3.2.6-alpha):
- - When running as a relay, make sure that we never build a path through
- ourselves, even in the case where we have somehow lost the version of
- our descriptor appearing in the consensus. Fixes part of bug 21534;
- bugfix on 0.2.0.1-alpha. This issue is also tracked as TROVE-2017-012
- and CVE-2017-8822.
- o Minor features (bridge, backport from 0.3.1.9):
- - Bridges now include notice in their descriptors that they are
- bridges, and notice of their distribution status, based on their
- publication settings. Implements ticket 18329. For more fine-
- grained control of how a bridge is distributed, upgrade to 0.3.2.x
- or later.
- o Minor features (directory authority, backport from 0.3.2.6-alpha):
- - Add an IPv6 address for the "bastet" directory authority. Closes
- ticket 24394.
- o Minor features (geoip):
- - Update geoip and geoip6 to the November 6 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (testing, backport from 0.3.1.6-rc):
- - Fix an undersized buffer in test-memwipe.c. Fixes bug 23291;
- bugfix on 0.2.7.2-alpha. Found and patched by Ties Stuij.
- Changes in version 0.2.5.16 - 2017-12-01
- Tor 0.2.5.13 backports important security and stability bugfixes from
- later Tor releases. All Tor users should upgrade to this release, or
- to another of the releases coming out today.
- Note: the Tor 0.2.5 series will no longer be supported after 1 May
- 2018. If you need a release with long-term support, please upgrade to
- the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
- o Major bugfixes (security, backport from 0.3.2.6-alpha):
- - Fix a denial of service bug where an attacker could use a
- malformed directory object to cause a Tor instance to pause while
- OpenSSL would try to read a passphrase from the terminal. (Tor
- instances run without a terminal, which is the case for most Tor
- packages, are not impacted.) Fixes bug 24246; bugfix on every
- version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
- Found by OSS-Fuzz as testcase 6360145429790720.
- - When checking for replays in the INTRODUCE1 cell data for a
- (legacy) onion service, correctly detect replays in the RSA-
- encrypted part of the cell. We were previously checking for
- replays on the entire cell, but those can be circumvented due to
- the malleability of Tor's legacy hybrid encryption. This fix helps
- prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
- 0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
- and CVE-2017-8819.
- o Major bugfixes (security, relay, backport from 0.3.2.6-alpha):
- - When running as a relay, make sure that we never build a path
- through ourselves, even in the case where we have somehow lost the
- version of our descriptor appearing in the consensus. Fixes part
- of bug 21534; bugfix on 0.2.0.1-alpha. This issue is also tracked
- as TROVE-2017-012 and CVE-2017-8822.
- o Minor features (bridge, backport from 0.3.1.9):
- - Bridges now include notice in their descriptors that they are
- bridges, and notice of their distribution status, based on their
- publication settings. Implements ticket 18329. For more fine-
- grained control of how a bridge is distributed, upgrade to 0.3.2.x
- or later.
- o Minor features (geoip):
- - Update geoip and geoip6 to the November 6 2017 Maxmind GeoLite2
- Country database.
- Changes in version 0.2.5.15 - 2017-10-25
- Tor 0.2.5.15 backports a collection of bugfixes from later Tor release
- series. It also adds a new directory authority, Bastet.
- Note: the Tor 0.2.5 series will no longer be supported after 1 May
- 2018. If you need a release with long-term support, please upgrade to
- the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
- o Directory authority changes:
- - Add "Bastet" as a ninth directory authority to the default list.
- Closes ticket 23910.
- - The directory authority "Longclaw" has changed its IP address.
- Closes ticket 23592.
- o Major bugfixes (openbsd, denial-of-service, backport from 0.3.1.5-alpha):
- - Avoid an assertion failure bug affecting our implementation of
- inet_pton(AF_INET6) on certain OpenBSD systems whose strtol()
- handling of "0xx" differs from what we had expected. Fixes bug
- 22789; bugfix on 0.2.3.8-alpha. Also tracked as TROVE-2017-007.
- o Minor features (geoip):
- - Update geoip and geoip6 to the October 4 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (defensive programming, undefined behavior, backport from 0.3.1.4-alpha):
- - Fix a memset() off the end of an array when packing cells. This
- bug should be harmless in practice, since the corrupted bytes are
- still in the same structure, and are always padding bytes,
- ignored, or immediately overwritten, depending on compiler
- behavior. Nevertheless, because the memset()'s purpose is to make
- sure that any other cell-handling bugs can't expose bytes to the
- network, we need to fix it. Fixes bug 22737; bugfix on
- 0.2.4.11-alpha. Fixes CID 1401591.
- o Build features (backport from 0.3.1.5-alpha):
- - Tor's repository now includes a Travis Continuous Integration (CI)
- configuration file (.travis.yml). This is meant to help new
- developers and contributors who fork Tor to a Github repository be
- better able to test their changes, and understand what we expect
- to pass. To use this new build feature, you must fork Tor to your
- Github account, then go into the "Integrations" menu in the
- repository settings for your fork and enable Travis, then push
- your changes. Closes ticket 22636.
- Changes in version 0.2.8.16 - 2017-10-25
- Tor 0.2.8.16 backports a collection of bugfixes from later Tor release
- series, including a bugfix for a crash issue that had affected relays
- under memory pressure. It also adds a new directory authority, Bastet.
- Note: the Tor 0.2.8 series will no longer be supported after 1 Jan
- 2018. If you need a release with long-term support, please stick with
- the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
- o Directory authority changes:
- - Add "Bastet" as a ninth directory authority to the default list.
- Closes ticket 23910.
- - The directory authority "Longclaw" has changed its IP address.
- Closes ticket 23592.
- o Major bugfixes (relay, crash, assertion failure, backport from 0.3.2.2-alpha):
- - Fix a timing-based assertion failure that could occur when the
- circuit out-of-memory handler freed a connection's output buffer.
- Fixes bug 23690; bugfix on 0.2.6.1-alpha.
- o Minor features (directory authorities, backport from 0.3.2.2-alpha):
- - Remove longclaw's IPv6 address, as it will soon change. Authority
- IPv6 addresses were originally added in 0.2.8.1-alpha. This leaves
- 3/8 directory authorities with IPv6 addresses, but there are also
- 52 fallback directory mirrors with IPv6 addresses. Resolves 19760.
- o Minor features (geoip):
- - Update geoip and geoip6 to the October 4 2017 Maxmind GeoLite2
- Country database.
- Changes in version 0.2.9.13 - 2017-10-25
- Tor 0.2.9.13 backports a collection of bugfixes from later Tor release
- series, including a bugfix for a crash issue that had affected relays
- under memory pressure. It also adds a new directory authority, Bastet.
- o Directory authority changes:
- - Add "Bastet" as a ninth directory authority to the default list.
- Closes ticket 23910.
- - The directory authority "Longclaw" has changed its IP address.
- Closes ticket 23592.
- o Major bugfixes (relay, crash, assertion failure, backport from 0.3.2.2-alpha):
- - Fix a timing-based assertion failure that could occur when the
- circuit out-of-memory handler freed a connection's output buffer.
- Fixes bug 23690; bugfix on 0.2.6.1-alpha.
- o Minor features (directory authorities, backport from 0.3.2.2-alpha):
- - Remove longclaw's IPv6 address, as it will soon change. Authority
- IPv6 addresses were originally added in 0.2.8.1-alpha. This leaves
- 3/8 directory authorities with IPv6 addresses, but there are also
- 52 fallback directory mirrors with IPv6 addresses. Resolves 19760.
- o Minor features (geoip):
- - Update geoip and geoip6 to the October 4 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (directory authority, backport from 0.3.1.5-alpha):
- - When a directory authority rejects a descriptor or extrainfo with
- a given digest, mark that digest as undownloadable, so that we do
- not attempt to download it again over and over. We previously
- tried to avoid downloading such descriptors by other means, but we
- didn't notice if we accidentally downloaded one anyway. This
- behavior became problematic in 0.2.7.2-alpha, when authorities
- began pinning Ed25519 keys. Fixes bug 22349; bugfix
- on 0.2.1.19-alpha.
- o Minor bugfixes (memory safety, backport from 0.3.2.3-alpha):
- - Clear the address when node_get_prim_orport() returns early.
- Fixes bug 23874; bugfix on 0.2.8.2-alpha.
- o Minor bugfixes (Windows service, backport from 0.3.1.6-rc):
- - When running as a Windows service, set the ID of the main thread
- correctly. Failure to do so made us fail to send log messages to
- the controller in 0.2.1.16-rc, slowed down controller event
- delivery in 0.2.7.3-rc and later, and crash with an assertion
- failure in 0.3.1.1-alpha. Fixes bug 23081; bugfix on 0.2.1.6-alpha.
- Patch and diagnosis from "Vort".
- Changes in version 0.3.0.12 - 2017-10-25
- Tor 0.3.0.12 backports a collection of bugfixes from later Tor release
- series, including a bugfix for a crash issue that had affected relays
- under memory pressure. It also adds a new directory authority, Bastet.
- Note: the Tor 0.3.0 series will no longer be supported after 26 Jan
- 2018. If you need a release with long-term support, please stick with
- the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
- o Directory authority changes:
- - Add "Bastet" as a ninth directory authority to the default list.
- Closes ticket 23910.
- - The directory authority "Longclaw" has changed its IP address.
- Closes ticket 23592.
- o Major bugfixes (relay, crash, assertion failure, backport from 0.3.2.2-alpha):
- - Fix a timing-based assertion failure that could occur when the
- circuit out-of-memory handler freed a connection's output buffer.
- Fixes bug 23690; bugfix on 0.2.6.1-alpha.
- o Minor features (directory authorities, backport from 0.3.2.2-alpha):
- - Remove longclaw's IPv6 address, as it will soon change. Authority
- IPv6 addresses were originally added in 0.2.8.1-alpha. This leaves
- 3/8 directory authorities with IPv6 addresses, but there are also
- 52 fallback directory mirrors with IPv6 addresses. Resolves 19760.
- o Minor features (geoip):
- - Update geoip and geoip6 to the October 4 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (directory authority, backport from 0.3.1.5-alpha):
- - When a directory authority rejects a descriptor or extrainfo with
- a given digest, mark that digest as undownloadable, so that we do
- not attempt to download it again over and over. We previously
- tried to avoid downloading such descriptors by other means, but we
- didn't notice if we accidentally downloaded one anyway. This
- behavior became problematic in 0.2.7.2-alpha, when authorities
- began pinning Ed25519 keys. Fixes bug 22349; bugfix
- on 0.2.1.19-alpha.
- o Minor bugfixes (hidden service, relay, backport from 0.3.2.2-alpha):
- - Avoid a possible double close of a circuit by the intro point on
- error of sending the INTRO_ESTABLISHED cell. Fixes bug 23610;
- bugfix on 0.3.0.1-alpha.
- o Minor bugfixes (memory safety, backport from 0.3.2.3-alpha):
- - Clear the address when node_get_prim_orport() returns early.
- Fixes bug 23874; bugfix on 0.2.8.2-alpha.
- o Minor bugfixes (Windows service, backport from 0.3.1.6-rc):
- - When running as a Windows service, set the ID of the main thread
- correctly. Failure to do so made us fail to send log messages to
- the controller in 0.2.1.16-rc, slowed down controller event
- delivery in 0.2.7.3-rc and later, and crash with an assertion
- failure in 0.3.1.1-alpha. Fixes bug 23081; bugfix on 0.2.1.6-alpha.
- Patch and diagnosis from "Vort".
- Changes in version 0.3.1.8 - 2017-10-25
- Tor 0.3.1.8 is the second stable release in the 0.3.1 series.
- It includes several bugfixes, including a bugfix for a crash issue
- that had affected relays under memory pressure. It also adds
- a new directory authority, Bastet.
- o Directory authority changes:
- - Add "Bastet" as a ninth directory authority to the default list.
- Closes ticket 23910.
- - The directory authority "Longclaw" has changed its IP address.
- Closes ticket 23592.
- o Major bugfixes (relay, crash, assertion failure, backport from 0.3.2.2-alpha):
- - Fix a timing-based assertion failure that could occur when the
- circuit out-of-memory handler freed a connection's output buffer.
- Fixes bug 23690; bugfix on 0.2.6.1-alpha.
- o Minor features (directory authorities, backport from 0.3.2.2-alpha):
- - Remove longclaw's IPv6 address, as it will soon change. Authority
- IPv6 addresses were originally added in 0.2.8.1-alpha. This leaves
- 3/8 directory authorities with IPv6 addresses, but there are also
- 52 fallback directory mirrors with IPv6 addresses. Resolves 19760.
- o Minor features (geoip):
- - Update geoip and geoip6 to the October 4 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (compilation, backport from 0.3.2.2-alpha):
- - Fix a compilation warning when building with zstd support on
- 32-bit platforms. Fixes bug 23568; bugfix on 0.3.1.1-alpha. Found
- and fixed by Andreas Stieger.
- o Minor bugfixes (compression, backport from 0.3.2.2-alpha):
- - Handle a pathological case when decompressing Zstandard data when
- the output buffer size is zero. Fixes bug 23551; bugfix
- on 0.3.1.1-alpha.
- o Minor bugfixes (directory authority, backport from 0.3.2.1-alpha):
- - Remove the length limit on HTTP status lines that authorities can
- send in their replies. Fixes bug 23499; bugfix on 0.3.1.6-rc.
- o Minor bugfixes (hidden service, relay, backport from 0.3.2.2-alpha):
- - Avoid a possible double close of a circuit by the intro point on
- error of sending the INTRO_ESTABLISHED cell. Fixes bug 23610;
- bugfix on 0.3.0.1-alpha.
- o Minor bugfixes (memory safety, backport from 0.3.2.3-alpha):
- - Clear the address when node_get_prim_orport() returns early.
- Fixes bug 23874; bugfix on 0.2.8.2-alpha.
- o Minor bugfixes (unit tests, backport from 0.3.2.2-alpha):
- - Fix additional channelpadding unit test failures by using mocked
- time instead of actual time for all tests. Fixes bug 23608; bugfix
- on 0.3.1.1-alpha.
- Changes in version 0.2.8.15 - 2017-09-18
- Tor 0.2.8.15 backports a collection of bugfixes from later
- Tor series.
- Most significantly, it includes a fix for TROVE-2017-008, a
- security bug that affects hidden services running with the
- SafeLogging option disabled. For more information, see
- https://trac.torproject.org/projects/tor/ticket/23490
- Note that Tor 0.2.8.x will no longer be supported after 1 Jan
- 2018. We suggest that you upgrade to the latest stable release if
- possible. If you can't, we recommend that you upgrade at least to
- 0.2.9, which will be supported until 2020.
- o Major bugfixes (openbsd, denial-of-service, backport from 0.3.1.5-alpha):
- - Avoid an assertion failure bug affecting our implementation of
- inet_pton(AF_INET6) on certain OpenBSD systems whose strtol()
- handling of "0xx" differs from what we had expected. Fixes bug
- 22789; bugfix on 0.2.3.8-alpha. Also tracked as TROVE-2017-007.
- o Minor features:
- - Update geoip and geoip6 to the September 6 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (compilation, mingw, backport from 0.3.1.1-alpha):
- - Backport a fix for an "unused variable" warning that appeared
- in some versions of mingw. Fixes bug 22838; bugfix on
- 0.2.8.1-alpha.
- o Minor bugfixes (defensive programming, undefined behavior, backport from 0.3.1.4-alpha):
- - Fix a memset() off the end of an array when packing cells. This
- bug should be harmless in practice, since the corrupted bytes are
- still in the same structure, and are always padding bytes,
- ignored, or immediately overwritten, depending on compiler
- behavior. Nevertheless, because the memset()'s purpose is to make
- sure that any other cell-handling bugs can't expose bytes to the
- network, we need to fix it. Fixes bug 22737; bugfix on
- 0.2.4.11-alpha. Fixes CID 1401591.
- o Build features (backport from 0.3.1.5-alpha):
- - Tor's repository now includes a Travis Continuous Integration (CI)
- configuration file (.travis.yml). This is meant to help new
- developers and contributors who fork Tor to a Github repository be
- better able to test their changes, and understand what we expect
- to pass. To use this new build feature, you must fork Tor to your
- Github account, then go into the "Integrations" menu in the
- repository settings for your fork and enable Travis, then push
- your changes. Closes ticket 22636.
- Changes in version 0.2.9.12 - 2017-09-18
- Tor 0.2.9.12 backports a collection of bugfixes from later
- Tor series.
- Most significantly, it includes a fix for TROVE-2017-008, a
- security bug that affects hidden services running with the
- SafeLogging option disabled. For more information, see
- https://trac.torproject.org/projects/tor/ticket/23490
- o Major features (security, backport from 0.3.0.2-alpha):
- - Change the algorithm used to decide DNS TTLs on client and server
- side, to better resist DNS-based correlation attacks like the
- DefecTor attack of Greschbach, Pulls, Roberts, Winter, and
- Feamster. Now relays only return one of two possible DNS TTL
- values, and clients are willing to believe DNS TTL values up to 3
- hours long. Closes ticket 19769.
- o Major bugfixes (crash, directory connections, backport from 0.3.0.5-rc):
- - Fix a rare crash when sending a begin cell on a circuit whose
- linked directory connection had already been closed. Fixes bug
- 21576; bugfix on 0.2.9.3-alpha. Reported by Alec Muffett.
- o Major bugfixes (DNS, backport from 0.3.0.2-alpha):
- - Fix a bug that prevented exit nodes from caching DNS records for
- more than 60 seconds. Fixes bug 19025; bugfix on 0.2.4.7-alpha.
- o Major bugfixes (linux TPROXY support, backport from 0.3.1.1-alpha):
- - Fix a typo that had prevented TPROXY-based transparent proxying
- from working under Linux. Fixes bug 18100; bugfix on 0.2.6.3-alpha.
- Patch from "d4fq0fQAgoJ".
- o Major bugfixes (openbsd, denial-of-service, backport from 0.3.1.5-alpha):
- - Avoid an assertion failure bug affecting our implementation of
- inet_pton(AF_INET6) on certain OpenBSD systems whose strtol()
- handling of "0xx" differs from what we had expected. Fixes bug
- 22789; bugfix on 0.2.3.8-alpha. Also tracked as TROVE-2017-007.
- o Minor features (code style, backport from 0.3.1.3-alpha):
- - Add "Falls through" comments to our codebase, in order to silence
- GCC 7's -Wimplicit-fallthrough warnings. Patch from Andreas
- Stieger. Closes ticket 22446.
- o Minor features (geoip):
- - Update geoip and geoip6 to the September 6 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (bandwidth accounting, backport from 0.3.1.1-alpha):
- - Roll over monthly accounting at the configured hour and minute,
- rather than always at 00:00. Fixes bug 22245; bugfix on 0.0.9rc1.
- Found by Andrey Karpov with PVS-Studio.
- o Minor bugfixes (compilation, backport from 0.3.1.5-alpha):
- - Suppress -Wdouble-promotion warnings with clang 4.0. Fixes bug 22915;
- bugfix on 0.2.8.1-alpha.
- - Fix warnings when building with libscrypt and openssl scrypt support
- on Clang. Fixes bug 22916; bugfix on 0.2.7.2-alpha.
- - When building with certain versions the mingw C header files, avoid
- float-conversion warnings when calling the C functions isfinite(),
- isnan(), and signbit(). Fixes bug 22801; bugfix on 0.2.8.1-alpha.
- o Minor bugfixes (compilation, backport from 0.3.1.7):
- - Avoid compiler warnings in the unit tests for running tor_sscanf()
- with wide string outputs. Fixes bug 15582; bugfix on 0.2.6.2-alpha.
- o Minor bugfixes (compilation, mingw, backport from 0.3.1.1-alpha):
- - Backport a fix for an "unused variable" warning that appeared
- in some versions of mingw. Fixes bug 22838; bugfix on
- 0.2.8.1-alpha.
- o Minor bugfixes (controller, backport from 0.3.1.7):
- - Do not crash when receiving a HSPOST command with an empty body.
- Fixes part of bug 22644; bugfix on 0.2.7.1-alpha.
- - Do not crash when receiving a POSTDESCRIPTOR command with an
- empty body. Fixes part of bug 22644; bugfix on 0.2.0.1-alpha.
- o Minor bugfixes (coverity build support, backport from 0.3.1.5-alpha):
- - Avoid Coverity build warnings related to our BUG() macro. By
- default, Coverity treats BUG() as the Linux kernel does: an
- instant abort(). We need to override that so our BUG() macro
- doesn't prevent Coverity from analyzing functions that use it.
- Fixes bug 23030; bugfix on 0.2.9.1-alpha.
- o Minor bugfixes (defensive programming, undefined behavior, backport from 0.3.1.4-alpha):
- - Fix a memset() off the end of an array when packing cells. This
- bug should be harmless in practice, since the corrupted bytes are
- still in the same structure, and are always padding bytes,
- ignored, or immediately overwritten, depending on compiler
- behavior. Nevertheless, because the memset()'s purpose is to make
- sure that any other cell-handling bugs can't expose bytes to the
- network, we need to fix it. Fixes bug 22737; bugfix on
- 0.2.4.11-alpha. Fixes CID 1401591.
- o Minor bugfixes (file limits, osx, backport from 0.3.1.5-alpha):
- - When setting the maximum number of connections allowed by the OS,
- always allow some extra file descriptors for other files. Fixes
- bug 22797; bugfix on 0.2.0.10-alpha.
- o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.1.5-alpha):
- - Avoid a sandbox failure when trying to re-bind to a socket and
- mark it as IPv6-only. Fixes bug 20247; bugfix on 0.2.5.1-alpha.
- o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.1.4-alpha):
- - Permit the fchmod system call, to avoid crashing on startup when
- starting with the seccomp2 sandbox and an unexpected set of
- permissions on the data directory or its contents. Fixes bug
- 22516; bugfix on 0.2.5.4-alpha.
- o Minor bugfixes (relay, backport from 0.3.0.5-rc):
- - Avoid a double-marked-circuit warning that could happen when we
- receive DESTROY cells under heavy load. Fixes bug 20059; bugfix
- on 0.1.0.1-rc.
- o Minor bugfixes (voting consistency, backport from 0.3.1.1-alpha):
- - Reject version numbers with non-numeric prefixes (such as +, -, or
- whitespace). Disallowing whitespace prevents differential version
- parsing between POSIX-based and Windows platforms. Fixes bug 21507
- and part of 21508; bugfix on 0.0.8pre1.
- o Build features (backport from 0.3.1.5-alpha):
- - Tor's repository now includes a Travis Continuous Integration (CI)
- configuration file (.travis.yml). This is meant to help new
- developers and contributors who fork Tor to a Github repository be
- better able to test their changes, and understand what we expect
- to pass. To use this new build feature, you must fork Tor to your
- Github account, then go into the "Integrations" menu in the
- repository settings for your fork and enable Travis, then push
- your changes. Closes ticket 22636.
- Changes in version 0.3.0.11 - 2017-09-18
- Tor 0.3.0.11 backports a collection of bugfixes from Tor the 0.3.1
- series.
- Most significantly, it includes a fix for TROVE-2017-008, a
- security bug that affects hidden services running with the
- SafeLogging option disabled. For more information, see
- https://trac.torproject.org/projects/tor/ticket/23490
- o Minor features (code style, backport from 0.3.1.7):
- - Add "Falls through" comments to our codebase, in order to silence
- GCC 7's -Wimplicit-fallthrough warnings. Patch from Andreas
- Stieger. Closes ticket 22446.
- o Minor features:
- - Update geoip and geoip6 to the September 6 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (compilation, backport from 0.3.1.7):
- - Avoid compiler warnings in the unit tests for calling tor_sscanf()
- with wide string outputs. Fixes bug 15582; bugfix on 0.2.6.2-alpha.
- o Minor bugfixes (controller, backport from 0.3.1.7):
- - Do not crash when receiving a HSPOST command with an empty body.
- Fixes part of bug 22644; bugfix on 0.2.7.1-alpha.
- - Do not crash when receiving a POSTDESCRIPTOR command with an empty
- body. Fixes part of bug 22644; bugfix on 0.2.0.1-alpha.
- o Minor bugfixes (file limits, osx, backport from 0.3.1.5-alpha):
- - When setting the maximum number of connections allowed by the OS,
- always allow some extra file descriptors for other files. Fixes
- bug 22797; bugfix on 0.2.0.10-alpha.
- o Minor bugfixes (logging, relay, backport from 0.3.1.6-rc):
- - Remove a forgotten debugging message when an introduction point
- successfully establishes a hidden service prop224 circuit with
- a client.
- - Change three other log_warn() for an introduction point to
- protocol warnings, because they can be failure from the network
- and are not relevant to the operator. Fixes bug 23078; bugfix on
- 0.3.0.1-alpha and 0.3.0.2-alpha.
- Changes in version 0.3.1.7 - 2017-09-18
- Tor 0.3.1.7 is the first stable release in the 0.3.1 series.
- With the 0.3.1 series, Tor now serves and downloads directory
- information in more compact formats, to save on bandwidth overhead. It
- also contains a new padding system to resist netflow-based traffic
- analysis, and experimental support for building parts of Tor in Rust
- (though no parts of Tor are in Rust yet). There are also numerous
- small features, bugfixes on earlier release series, and groundwork for
- the hidden services revamp of 0.3.2.
- This release also includes a fix for TROVE-2017-008, a security bug
- that affects hidden services running with the SafeLogging option
- disabled. For more information, see
- https://trac.torproject.org/projects/tor/ticket/23490
- Per our stable release policy, we plan to support each stable release
- series for at least the next nine months, or for three months after
- the first stable release of the next series: whichever is longer. If
- you need a release with long-term support, we recommend that you stay
- with the 0.2.9 series.
- Below is a list of the changes since 0.3.0. For a list of all
- changes since 0.3.1.6-rc, see the ChangeLog file.
- o New dependencies:
- - To build with zstd and lzma support, Tor now requires the
- pkg-config tool at build time.
- o Major bugfixes (security, hidden services, loggging):
- - Fix a bug where we could log uninitialized stack when a certain
- hidden service error occurred while SafeLogging was disabled.
- Fixes bug #23490; bugfix on 0.2.7.2-alpha.
- This is also tracked as TROVE-2017-008 and CVE-2017-0380.
- o Major features (build system, continuous integration):
- - Tor's repository now includes a Travis Continuous Integration (CI)
- configuration file (.travis.yml). This is meant to help new
- developers and contributors who fork Tor to a Github repository be
- better able to test their changes, and understand what we expect
- to pass. To use this new build feature, you must fork Tor to your
- Github account, then go into the "Integrations" menu in the
- repository settings for your fork and enable Travis, then push
- your changes. Closes ticket 22636.
- o Major features (directory protocol):
- - Tor relays and authorities can now serve clients an abbreviated
- version of the consensus document, containing only the changes
- since an older consensus document that the client holds. Clients
- now request these documents when available. When both client and
- server use this new protocol, they will use far less bandwidth (up
- to 94% less) to keep the client's consensus up-to-date. Implements
- proposal 140; closes ticket 13339. Based on work by Daniel Martí.
- - Tor can now compress directory traffic with lzma or with zstd
- compression algorithms, which can deliver better bandwidth
- performance. Because lzma is computationally expensive, it's only
- used for documents that can be compressed once and served many
- times. Support for these algorithms requires that tor is built
- with the libzstd and/or liblzma libraries available. Implements
- proposal 278; closes ticket 21662.
- - Relays now perform the more expensive compression operations, and
- consensus diff generation, in worker threads. This separation
- avoids delaying the main thread when a new consensus arrives.
- o Major features (experimental):
- - Tor can now build modules written in Rust. To turn this on, pass
- the "--enable-rust" flag to the configure script. It's not time to
- get excited yet: currently, there is no actual Rust functionality
- beyond some simple glue code, and a notice at startup to tell you
- that Rust is running. Still, we hope that programmers and
- packagers will try building Tor with Rust support, so that we can
- find issues and solve portability problems. Closes ticket 22106.
- o Major features (traffic analysis resistance):
- - Connections between clients and relays now send a padding cell in
- each direction every 1.5 to 9.5 seconds (tunable via consensus
- parameters). This padding will not resist specialized
- eavesdroppers, but it should be enough to make many ISPs' routine
- network flow logging less useful in traffic analysis against
- Tor users.
- Padding is negotiated using Tor's link protocol, so both relays
- and clients must upgrade for this to take effect. Clients may
- still send padding despite the relay's version by setting
- ConnectionPadding 1 in torrc, and may disable padding by setting
- ConnectionPadding 0 in torrc. Padding may be minimized for mobile
- users with the torrc option ReducedConnectionPadding. Implements
- Proposal 251 and Section 2 of Proposal 254; closes ticket 16861.
- - Relays will publish 24 hour totals of padding and non-padding cell
- counts to their extra-info descriptors, unless PaddingStatistics 0
- is set in torrc. These 24 hour totals are also rounded to
- multiples of 10000.
- o Major bugfixes (hidden service, relay, security):
- - Fix a remotely triggerable assertion failure when a hidden service
- handles a malformed BEGIN cell. Fixes bug 22493, tracked as
- TROVE-2017-004 and as CVE-2017-0375; bugfix on 0.3.0.1-alpha.
- - Fix a remotely triggerable assertion failure caused by receiving a
- BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
- 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
- on 0.2.2.1-alpha.
- o Major bugfixes (path selection, security):
- - When choosing which guard to use for a circuit, avoid the exit's
- family along with the exit itself. Previously, the new guard
- selection logic avoided the exit, but did not consider its family.
- Fixes bug 22753; bugfix on 0.3.0.1-alpha. Tracked as TROVE-2017-
- 006 and CVE-2017-0377.
- o Major bugfixes (connection usage):
- - We use NETINFO cells to try to determine if both relays involved
- in a connection will agree on the canonical status of that
- connection. We prefer the connections where this is the case for
- extend cells, and try to close connections where relays disagree
- on their canonical status early. Also, we now prefer the oldest
- valid connection for extend cells. These two changes should reduce
- the number of long-term connections that are kept open between
- relays. Fixes bug 17604; bugfix on 0.2.5.5-alpha.
- - Relays now log hourly statistics (look for
- "channel_check_for_duplicates" lines) on the total number of
- connections to other relays. If the number of connections per
- relay is unexpectedly large, this log message is at notice level.
- Otherwise it is at info.
- o Major bugfixes (entry guards):
- - When starting with an old consensus, do not add new entry guards
- unless the consensus is "reasonably live" (under 1 day old). Fixes
- one root cause of bug 22400; bugfix on 0.3.0.1-alpha.
- - Don't block bootstrapping when a primary bridge is offline and we
- can't get its descriptor. Fixes bug 22325; fixes one case of bug
- 21969; bugfix on 0.3.0.3-alpha.
- o Major bugfixes (linux TPROXY support):
- - Fix a typo that had prevented TPROXY-based transparent proxying
- from working under Linux. Fixes bug 18100; bugfix on 0.2.6.3-alpha.
- Patch from "d4fq0fQAgoJ".
- o Major bugfixes (openbsd, denial-of-service):
- - Avoid an assertion failure bug affecting our implementation of
- inet_pton(AF_INET6) on certain OpenBSD systems whose strtol()
- handling of "0xx" differs from what we had expected. Fixes bug
- 22789; bugfix on 0.2.3.8-alpha. Also tracked as TROVE-2017-007.
- o Major bugfixes (relay, link handshake):
- - When performing the v3 link handshake on a TLS connection, report
- that we have the x509 certificate that we actually used on that
- connection, even if we have changed certificates since that
- connection was first opened. Previously, we would claim to have
- used our most recent x509 link certificate, which would sometimes
- make the link handshake fail. Fixes one case of bug 22460; bugfix
- on 0.2.3.6-alpha.
- o Major bugfixes (relays, key management):
- - Regenerate link and authentication certificates whenever the key
- that signs them changes; also, regenerate link certificates
- whenever the signed key changes. Previously, these processes were
- only weakly coupled, and we relays could (for minutes to hours)
- wind up with an inconsistent set of keys and certificates, which
- other relays would not accept. Fixes two cases of bug 22460;
- bugfix on 0.3.0.1-alpha.
- - When sending an Ed25519 signing->link certificate in a CERTS cell,
- send the certificate that matches the x509 certificate that we
- used on the TLS connection. Previously, there was a race condition
- if the TLS context rotated after we began the TLS handshake but
- before we sent the CERTS cell. Fixes a case of bug 22460; bugfix
- on 0.3.0.1-alpha.
- o Minor features (security, windows):
- - Enable a couple of pieces of Windows hardening: one
- (HeapEnableTerminationOnCorruption) that has been on-by-default
- since Windows 8, and unavailable before Windows 7; and one
- (PROCESS_DEP_DISABLE_ATL_THUNK_EMULATION) which we believe doesn't
- affect us, but shouldn't do any harm. Closes ticket 21953.
- o Minor features (bridge authority):
- - Add "fingerprint" lines to the networkstatus-bridges file produced
- by bridge authorities. Closes ticket 22207.
- o Minor features (code style):
- - Add "Falls through" comments to our codebase, in order to silence
- GCC 7's -Wimplicit-fallthrough warnings. Patch from Andreas
- Stieger. Closes ticket 22446.
- o Minor features (config options):
- - Allow "%include" directives in torrc configuration files. These
- directives import the settings from other files, or from all the
- files in a directory. Closes ticket 1922. Code by Daniel Pinto.
- - Make SAVECONF return an error when overwriting a torrc that has
- includes. Using SAVECONF with the FORCE option will allow it to
- overwrite torrc even if includes are used. Related to ticket 1922.
- - Add "GETINFO config-can-saveconf" to tell controllers if SAVECONF
- will work without the FORCE option. Related to ticket 1922.
- o Minor features (controller):
- - Warn the first time that a controller requests data in the long-
- deprecated 'GETINFO network-status' format. Closes ticket 21703.
- o Minor features (defaults):
- - The default value for UseCreateFast is now 0: clients which
- haven't yet received a consensus document will now use a proper
- ntor handshake to talk to their directory servers whenever they
- can. Closes ticket 21407.
- - Onion key rotation and expiry intervals are now defined as a
- network consensus parameter, per proposal 274. The default
- lifetime of an onion key is increased from 7 to 28 days. Old onion
- keys will expire after 7 days by default. This change will make
- consensus diffs much smaller, and save significant bandwidth.
- Closes ticket 21641.
- o Minor features (defensive programming):
- - Create a pair of consensus parameters, nf_pad_tor2web and
- nf_pad_single_onion, to disable netflow padding in the consensus
- for non-anonymous connections in case the overhead is high. Closes
- ticket 17857.
- o Minor features (diagnostic):
- - Add a stack trace to the bug warnings that can be logged when
- trying to send an outgoing relay cell with n_chan == 0. Diagnostic
- attempt for bug 23105.
- - Add logging messages to try to diagnose a rare bug that seems to
- generate RSA->Ed25519 cross-certificates dated in the 1970s. We
- think this is happening because of incorrect system clocks, but
- we'd like to know for certain. Diagnostic for bug 22466.
- - Avoid an assertion failure, and log a better error message, when
- unable to remove a file from the consensus cache on Windows.
- Attempts to mitigate and diagnose bug 22752.
- o Minor features (directory authority):
- - Improve the message that authorities report to relays that present
- RSA/Ed25519 keypairs that conflict with previously pinned keys.
- Closes ticket 22348.
- o Minor features (directory cache, consensus diff):
- - Add a new MaxConsensusAgeForDiffs option to allow directory cache
- operators with low-resource environments to adjust the number of
- consensuses they'll store and generate diffs from. Most cache
- operators should leave it unchanged. Helps to work around
- bug 22883.
- o Minor features (fallback directory list):
- - Update the fallback directory mirror whitelist and blacklist based
- on operator emails. Closes task 21121.
- - Replace the 177 fallbacks originally introduced in Tor 0.2.9.8 in
- December 2016 (of which ~126 were still functional) with a list of
- 151 fallbacks (32 new, 119 unchanged, 58 removed) generated in May
- 2017. Resolves ticket 21564.
- o Minor features (geoip):
- - Update geoip and geoip6 to the September 6 2017 Maxmind GeoLite2
- Country database.
- o Minor features (hidden services, logging):
- - Log a message when a hidden service descriptor has fewer
- introduction points than specified in
- HiddenServiceNumIntroductionPoints. Closes tickets 21598.
- - Log a message when a hidden service reaches its introduction point
- circuit limit, and when that limit is reset. Follow up to ticket
- 21594; closes ticket 21622.
- - Warn user if multiple entries in EntryNodes and at least one
- HiddenService are used together. Pinning EntryNodes along with a
- hidden service can be possibly harmful; for instance see ticket
- 14917 or 21155. Closes ticket 21155.
- o Minor features (linux seccomp2 sandbox):
- - We now have a document storage backend compatible with the Linux
- seccomp2 sandbox. This backend is used for consensus documents and
- diffs between them; in the long term, we'd like to use it for
- unparseable directory material too. Closes ticket 21645
- - Increase the maximum allowed size passed to mprotect(PROT_WRITE)
- from 1MB to 16MB. This was necessary with the glibc allocator in
- order to allow worker threads to allocate more memory -- which in
- turn is necessary because of our new use of worker threads for
- compression. Closes ticket 22096.
- o Minor features (logging):
- - Log files are no longer created world-readable by default.
- (Previously, most distributors would store the logs in a non-
- world-readable location to prevent inappropriate access. This
- change is an extra precaution.) Closes ticket 21729; patch
- from toralf.
- o Minor features (performance):
- - Our Keccak (SHA-3) implementation now accesses memory more
- efficiently, especially on little-endian systems. Closes
- ticket 21737.
- - Add an O(1) implementation of channel_find_by_global_id(), to
- speed some controller functions.
- o Minor features (relay, configuration):
- - The MyFamily option may now be repeated as many times as desired,
- for relays that want to configure large families. Closes ticket
- 4998; patch by Daniel Pinto.
- o Minor features (relay, performance):
- - Always start relays with at least two worker threads, to prevent
- priority inversion on slow tasks. Part of the fix for bug 22883.
- - Allow background work to be queued with different priorities, so
- that a big pile of slow low-priority jobs will not starve out
- higher priority jobs. This lays the groundwork for a fix for
- bug 22883.
- o Minor features (safety):
- - Add an explicit check to extrainfo_parse_entry_from_string() for
- NULL inputs. We don't believe this can actually happen, but it may
- help silence a warning from the Clang analyzer. Closes
- ticket 21496.
- o Minor features (testing):
- - Add more tests for compression backend initialization. Closes
- ticket 22286.
- - Add a "--disable-memory-sentinels" feature to help with fuzzing.
- When Tor is compiled with this option, we disable a number of
- redundant memory-safety failsafes that are intended to stop bugs
- from becoming security issues. This makes it easier to hunt for
- bugs that would be security issues without the failsafes turned
- on. Closes ticket 21439.
- - Add a general event-tracing instrumentation support to Tor. This
- subsystem will enable developers and researchers to add fine-
- grained instrumentation to their Tor instances, for use when
- examining Tor network performance issues. There are no trace
- events yet, and event-tracing is off by default unless enabled at
- compile time. Implements ticket 13802.
- - Improve our version parsing tests: add tests for typical version
- components, add tests for invalid versions, including numeric
- range and non-numeric prefixes. Unit tests 21278, 21450, and
- 21507. Partially implements 21470.
- o Minor bugfixes (bandwidth accounting):
- - Roll over monthly accounting at the configured hour and minute,
- rather than always at 00:00. Fixes bug 22245; bugfix on 0.0.9rc1.
- Found by Andrey Karpov with PVS-Studio.
- o Minor bugfixes (code correctness):
- - Accurately identify client connections by their lack of peer
- authentication. This means that we bail out earlier if asked to
- extend to a client. Follow-up to 21407. Fixes bug 21406; bugfix
- on 0.2.4.23.
- o Minor bugfixes (compilation warnings):
- - Suppress -Wdouble-promotion warnings with clang 4.0. Fixes bug
- 22915; bugfix on 0.2.8.1-alpha.
- - Fix warnings when building with libscrypt and openssl scrypt
- support on Clang. Fixes bug 22916; bugfix on 0.2.7.2-alpha.
- - When building with certain versions of the mingw C header files,
- avoid float-conversion warnings when calling the C functions
- isfinite(), isnan(), and signbit(). Fixes bug 22801; bugfix
- on 0.2.8.1-alpha.
- o Minor bugfixes (compilation):
- - Avoid compiler warnings in the unit tests for calling tor_sscanf()
- with wide string outputs. Fixes bug 15582; bugfix on 0.2.6.2-alpha.
- o Minor bugfixes (compression):
- - When spooling compressed data to an output buffer, don't try to
- spool more data when there is no more data to spool and we are not
- trying to flush the input. Previously, we would sometimes launch
- compression requests with nothing to do, which interferes with our
- 22672 checks. Fixes bug 22719; bugfix on 0.2.0.16-alpha.
- o Minor bugfixes (configuration):
- - Do not crash when starting with LearnCircuitBuildTimeout 0. Fixes
- bug 22252; bugfix on 0.2.9.3-alpha.
- o Minor bugfixes (connection lifespan):
- - Allow more control over how long TLS connections are kept open:
- unify CircuitIdleTimeout and PredictedPortsRelevanceTime into a
- single option called CircuitsAvailableTimeout. Also, allow the
- consensus to control the default values for both this preference
- and the lifespan of relay-to-relay connections. Fixes bug 17592;
- bugfix on 0.2.5.5-alpha.
- - Increase the initial circuit build timeout testing frequency, to
- help ensure that ReducedConnectionPadding clients finish learning
- a timeout before their orconn would expire. The initial testing
- rate was set back in the days of TAP and before the Tor Browser
- updater, when we had to be much more careful about new clients
- making lots of circuits. With this change, a circuit build timeout
- is learned in about 15-20 minutes, instead of 100-120 minutes.
- o Minor bugfixes (controller):
- - Do not crash when receiving a HSPOST command with an empty body.
- Fixes part of bug 22644; bugfix on 0.2.7.1-alpha.
- - Do not crash when receiving a POSTDESCRIPTOR command with an empty
- body. Fixes part of bug 22644; bugfix on 0.2.0.1-alpha.
- - GETINFO onions/current and onions/detached no longer respond with
- 551 on empty lists. Fixes bug 21329; bugfix on 0.2.7.1-alpha.
- - Trigger HS descriptor events on the control port when the client
- fails to pick a hidden service directory for a hidden service.
- This can happen if all the hidden service directories are in
- ExcludeNodes, or they have all been queried within the last 15
- minutes. Fixes bug 22042; bugfix on 0.2.5.2-alpha.
- o Minor bugfixes (correctness):
- - Avoid undefined behavior when parsing IPv6 entries from the geoip6
- file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
- o Minor bugfixes (coverity build support):
- - Avoid Coverity build warnings related to our BUG() macro. By
- default, Coverity treats BUG() as the Linux kernel does: an
- instant abort(). We need to override that so our BUG() macro
- doesn't prevent Coverity from analyzing functions that use it.
- Fixes bug 23030; bugfix on 0.2.9.1-alpha.
- o Minor bugfixes (defensive programming):
- - Detect and break out of infinite loops in our compression code. We
- don't think that any such loops exist now, but it's best to be
- safe. Closes ticket 22672.
- - Fix a memset() off the end of an array when packing cells. This
- bug should be harmless in practice, since the corrupted bytes are
- still in the same structure, and are always padding bytes,
- ignored, or immediately overwritten, depending on compiler
- behavior. Nevertheless, because the memset()'s purpose is to make
- sure that any other cell-handling bugs can't expose bytes to the
- network, we need to fix it. Fixes bug 22737; bugfix on
- 0.2.4.11-alpha. Fixes CID 1401591.
- o Minor bugfixes (directory authority):
- - When a directory authority rejects a descriptor or extrainfo with
- a given digest, mark that digest as undownloadable, so that we do
- not attempt to download it again over and over. We previously
- tried to avoid downloading such descriptors by other means, but we
- didn't notice if we accidentally downloaded one anyway. This
- behavior became problematic in 0.2.7.2-alpha, when authorities
- began pinning Ed25519 keys. Fixes bug 22349; bugfix
- on 0.2.1.19-alpha.
- - When rejecting a router descriptor for running an obsolete version
- of Tor without ntor support, warn about the obsolete tor version,
- not the missing ntor key. Fixes bug 20270; bugfix on 0.2.9.3-alpha.
- - Prevent the shared randomness subsystem from asserting when
- initialized by a bridge authority with an incomplete configuration
- file. Fixes bug 21586; bugfix on 0.2.9.8.
- o Minor bugfixes (error reporting, windows):
- - When formatting Windows error messages, use the English format to
- avoid codepage issues. Fixes bug 22520; bugfix on 0.1.2.8-alpha.
- Patch from "Vort".
- o Minor bugfixes (exit-side DNS):
- - Fix an untriggerable assertion that checked the output of a
- libevent DNS error, so that the assertion actually behaves as
- expected. Fixes bug 22244; bugfix on 0.2.0.20-rc. Found by Andrey
- Karpov using PVS-Studio.
- o Minor bugfixes (fallback directories):
- - Make the usage example in updateFallbackDirs.py actually work, and
- explain what it does. Fixes bug 22270; bugfix on 0.3.0.3-alpha.
- - Decrease the guard flag average required to be a fallback. This
- allows us to keep relays that have their guard flag removed when
- they restart. Fixes bug 20913; bugfix on 0.2.8.1-alpha.
- - Decrease the minimum number of fallbacks to 100. Fixes bug 20913;
- bugfix on 0.2.8.1-alpha.
- - Make sure fallback directory mirrors have the same address, port,
- and relay identity key for at least 30 days before they are
- selected. Fixes bug 20913; bugfix on 0.2.8.1-alpha.
- o Minor bugfixes (file limits, osx):
- - When setting the maximum number of connections allowed by the OS,
- always allow some extra file descriptors for other files. Fixes
- bug 22797; bugfix on 0.2.0.10-alpha.
- o Minor bugfixes (hidden services):
- - Increase the number of circuits that a service is allowed to
- open over a specific period of time. The value was lower than it
- should be (8 vs 12) in the normal case of 3 introduction points.
- Fixes bug 22159; bugfix on 0.3.0.5-rc.
- - Fix a BUG warning during HSv3 descriptor decoding that could be
- cause by a specially crafted descriptor. Fixes bug 23233; bugfix
- on 0.3.0.1-alpha. Bug found by "haxxpop".
- - Stop printing a cryptic warning when a hidden service gets a
- request to connect to a virtual port that it hasn't configured.
- Fixes bug 16706; bugfix on 0.2.6.3-alpha.
- - Simplify hidden service descriptor creation by using an existing
- flag to check if an introduction point is established. Fixes bug
- 21599; bugfix on 0.2.7.2-alpha.
- o Minor bugfixes (link handshake):
- - Lower the lifetime of the RSA->Ed25519 cross-certificate to six
- months, and regenerate it when it is within one month of expiring.
- Previously, we had generated this certificate at startup with a
- ten-year lifetime, but that could lead to weird behavior when Tor
- was started with a grossly inaccurate clock. Mitigates bug 22466;
- mitigation on 0.3.0.1-alpha.
- o Minor bugfixes (linux seccomp2 sandbox):
- - Avoid a sandbox failure when trying to re-bind to a socket and
- mark it as IPv6-only. Fixes bug 20247; bugfix on 0.2.5.1-alpha.
- - Permit the fchmod system call, to avoid crashing on startup when
- starting with the seccomp2 sandbox and an unexpected set of
- permissions on the data directory or its contents. Fixes bug
- 22516; bugfix on 0.2.5.4-alpha.
- o Minor bugfixes (logging):
- - When decompressing, do not warn if we fail to decompress using a
- compression method that we merely guessed. Fixes part of bug
- 22670; bugfix on 0.1.1.14-alpha.
- - When decompressing, treat mismatch between content-encoding and
- actual compression type as a protocol warning. Fixes part of bug
- 22670; bugfix on 0.1.1.9-alpha.
- - Downgrade "assigned_to_cpuworker failed" message to info-level
- severity. In every case that can reach it, either a better warning
- has already been logged, or no warning is warranted. Fixes bug
- 22356; bugfix on 0.2.6.3-alpha.
- - Log a better message when a directory authority replies to an
- upload with an unexpected status code. Fixes bug 11121; bugfix
- on 0.1.0.1-rc.
- - Downgrade a log statement about unexpected relay cells from "bug"
- to "protocol warning", because there is at least one use case
- where it can be triggered by a buggy tor implementation. Fixes bug
- 21293; bugfix on 0.1.1.14-alpha.
- o Minor bugfixes (logging, relay):
- - Remove a forgotten debugging message when an introduction point
- successfully establishes a hidden service prop224 circuit with
- a client.
- - Change three other log_warn() for an introduction point to
- protocol warnings, because they can be failure from the network
- and are not relevant to the operator. Fixes bug 23078; bugfix on
- 0.3.0.1-alpha and 0.3.0.2-alpha.
- o Minor bugfixes (relay):
- - Inform the geoip and rephist modules about all requests, even on
- relays that are only fetching microdescriptors. Fixes a bug
- related to 21585; bugfix on 0.3.0.1-alpha.
- o Minor bugfixes (memory leaks):
- - Fix a small memory leak at exit from the backtrace handler code.
- Fixes bug 21788; bugfix on 0.2.5.2-alpha. Patch from Daniel Pinto.
- - When directory authorities reject a router descriptor due to
- keypinning, free the router descriptor rather than leaking the
- memory. Fixes bug 22370; bugfix on 0.2.7.2-alpha.
- - Fix a small memory leak when validating a configuration that uses
- two or more AF_UNIX sockets for the same port type. Fixes bug
- 23053; bugfix on 0.2.6.3-alpha. This is CID 1415725.
- o Minor bugfixes (process behavior):
- - When exiting because of an error, always exit with a nonzero exit
- status. Previously, we would fail to report an error in our exit
- status in cases related to __OwningControllerProcess failure,
- lockfile contention, and Ed25519 key initialization. Fixes bug
- 22720; bugfix on versions 0.2.1.6-alpha, 0.2.2.28-beta, and
- 0.2.7.2-alpha respectively. Reported by "f55jwk4f"; patch
- from "huyvq".
- o Minor bugfixes (robustness, error handling):
- - Improve our handling of the cases where OpenSSL encounters a
- memory error while encoding keys and certificates. We haven't
- observed these errors in the wild, but if they do happen, we now
- detect and respond better. Fixes bug 19418; bugfix on all versions
- of Tor. Reported by Guido Vranken.
- o Minor bugfixes (testing):
- - Fix an undersized buffer in test-memwipe.c. Fixes bug 23291;
- bugfix on 0.2.7.2-alpha. Found and patched by Ties Stuij.
- - Use unbuffered I/O for utility functions around the
- process_handle_t type. This fixes unit test failures reported on
- OpenBSD and FreeBSD. Fixes bug 21654; bugfix on 0.2.3.1-alpha.
- - Make display of captured unit test log messages consistent. Fixes
- bug 21510; bugfix on 0.2.9.3-alpha.
- - Make test-network.sh always call chutney's test-network.sh.
- Previously, this only worked on systems which had bash installed,
- due to some bash-specific code in the script. Fixes bug 19699;
- bugfix on 0.3.0.4-rc. Follow-up to ticket 21581.
- - Fix a memory leak in the link-handshake/certs_ok_ed25519 test.
- Fixes bug 22803; bugfix on 0.3.0.1-alpha.
- - The unit tests now pass on systems where localhost is misconfigured
- to some IPv4 address other than 127.0.0.1. Fixes bug 6298; bugfix
- on 0.0.9pre2.
- o Minor bugfixes (voting consistency):
- - Reject version numbers with non-numeric prefixes (such as +, -, or
- whitespace). Disallowing whitespace prevents differential version
- parsing between POSIX-based and Windows platforms. Fixes bug 21507
- and part of 21508; bugfix on 0.0.8pre1.
- o Minor bugfixes (Windows service):
- - When running as a Windows service, set the ID of the main thread
- correctly. Failure to do so made us fail to send log messages to
- the controller in 0.2.1.16-rc, slowed down controller event
- delivery in 0.2.7.3-rc and later, and crash with an assertion
- failure in 0.3.1.1-alpha. Fixes bug 23081; bugfix on 0.2.1.6-alpha.
- Patch and diagnosis from "Vort".
- o Minor bugfixes (windows, relay):
- - Resolve "Failure from drain_fd: No error" warnings on Windows
- relays. Fixes bug 21540; bugfix on 0.2.6.3-alpha.
- o Code simplification and refactoring:
- - Break up the 630-line function connection_dir_client_reached_eof()
- into a dozen smaller functions. This change should help
- maintainability and readability of the client directory code.
- - Isolate our use of the openssl headers so that they are only
- included from our crypto wrapper modules, and from tests that
- examine those modules' internals. Closes ticket 21841.
- - Simplify our API to launch directory requests, making it more
- extensible and less error-prone. Now it's easier to add extra
- headers to directory requests. Closes ticket 21646.
- - Our base64 decoding functions no longer overestimate the output
- space that they need when parsing unpadded inputs. Closes
- ticket 17868.
- - Remove unused "ROUTER_ADDED_NOTIFY_GENERATOR" internal value.
- Resolves ticket 22213.
- - The logic that directory caches use to spool request to clients,
- serving them one part at a time so as not to allocate too much
- memory, has been refactored for consistency. Previously there was
- a separate spooling implementation per type of spoolable data. Now
- there is one common spooling implementation, with extensible data
- types. Closes ticket 21651.
- - Tor's compression module now supports multiple backends. Part of
- the implementation for proposal 278; closes ticket 21663.
- o Documentation:
- - Add a manpage description for the key-pinning-journal file. Closes
- ticket 22347.
- - Correctly note that bandwidth accounting values are stored in the
- state file, and the bw_accounting file is now obsolete. Closes
- ticket 16082.
- - Document more of the files in the Tor data directory, including
- cached-extrainfo, secret_onion_key{,_ntor}.old, hidserv-stats,
- approved-routers, sr-random, and diff-cache. Found while fixing
- ticket 22347.
- - Clarify the manpage for the (deprecated) torify script. Closes
- ticket 6892.
- - Clarify the behavior of the KeepAliveIsolateSOCKSAuth sub-option.
- Closes ticket 21873.
- - Correct documentation about the default DataDirectory value.
- Closes ticket 21151.
- - Document the default behavior of NumEntryGuards and
- NumDirectoryGuards correctly. Fixes bug 21715; bugfix
- on 0.3.0.1-alpha.
- - Document key=value pluggable transport arguments for Bridge lines
- in torrc. Fixes bug 20341; bugfix on 0.2.5.1-alpha.
- - Note that bandwidth-limiting options don't affect TCP headers or
- DNS. Closes ticket 17170.
- o Removed features (configuration options, all in ticket 22060):
- - These configuration options are now marked Obsolete, and no longer
- have any effect: AllowInvalidNodes, AllowSingleHopCircuits,
- AllowSingleHopExits, ExcludeSingleHopRelays, FastFirstHopPK,
- TLSECGroup, WarnUnsafeSocks. They were first marked as deprecated
- in 0.2.9.2-alpha and have now been removed. The previous default
- behavior is now always chosen; the previous (less secure) non-
- default behavior is now unavailable.
- - CloseHSClientCircuitsImmediatelyOnTimeout and
- CloseHSServiceRendCircuitsImmediatelyOnTimeout were deprecated in
- 0.2.9.2-alpha and now have been removed. HS circuits never close
- on circuit build timeout; they have a longer timeout period.
- - {Control,DNS,Dir,Socks,Trans,NATD,OR}ListenAddress were deprecated
- in 0.2.9.2-alpha and now have been removed. Use the ORPort option
- (and others) to configure listen-only and advertise-only addresses.
- o Removed features (tools):
- - We've removed the tor-checkkey tool from src/tools. Long ago, we
- used it to help people detect RSA keys that were generated by
- versions of Debian affected by CVE-2008-0166. But those keys have
- been out of circulation for ages, and this tool is no longer
- required. Closes ticket 21842.
- Changes in version 0.3.0.10 - 2017-08-02
- Tor 0.3.0.10 backports a collection of small-to-medium bugfixes
- from the current Tor alpha series. OpenBSD users and TPROXY users
- should upgrade; others are probably okay sticking with 0.3.0.9.
- o Major features (build system, continuous integration, backport from 0.3.1.5-alpha):
- - Tor's repository now includes a Travis Continuous Integration (CI)
- configuration file (.travis.yml). This is meant to help new
- developers and contributors who fork Tor to a Github repository be
- better able to test their changes, and understand what we expect
- to pass. To use this new build feature, you must fork Tor to your
- Github account, then go into the "Integrations" menu in the
- repository settings for your fork and enable Travis, then push
- your changes. Closes ticket 22636.
- o Major bugfixes (linux TPROXY support, backport from 0.3.1.1-alpha):
- - Fix a typo that had prevented TPROXY-based transparent proxying
- from working under Linux. Fixes bug 18100; bugfix on 0.2.6.3-alpha.
- Patch from "d4fq0fQAgoJ".
- o Major bugfixes (openbsd, denial-of-service, backport from 0.3.1.5-alpha):
- - Avoid an assertion failure bug affecting our implementation of
- inet_pton(AF_INET6) on certain OpenBSD systems whose strtol()
- handling of "0xbar" differs from what we had expected. Fixes bug
- 22789; bugfix on 0.2.3.8-alpha. Also tracked as TROVE-2017-007.
- o Minor features (backport from 0.3.1.5-alpha):
- - Update geoip and geoip6 to the July 4 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (bandwidth accounting, backport from 0.3.1.2-alpha):
- - Roll over monthly accounting at the configured hour and minute,
- rather than always at 00:00. Fixes bug 22245; bugfix on 0.0.9rc1.
- Found by Andrey Karpov with PVS-Studio.
- o Minor bugfixes (compilation warnings, backport from 0.3.1.5-alpha):
- - Suppress -Wdouble-promotion warnings with clang 4.0. Fixes bug 22915;
- bugfix on 0.2.8.1-alpha.
- - Fix warnings when building with libscrypt and openssl scrypt
- support on Clang. Fixes bug 22916; bugfix on 0.2.7.2-alpha.
- - When building with certain versions of the mingw C header files,
- avoid float-conversion warnings when calling the C functions
- isfinite(), isnan(), and signbit(). Fixes bug 22801; bugfix
- on 0.2.8.1-alpha.
- o Minor bugfixes (compilation, mingw, backport from 0.3.1.1-alpha):
- - Backport a fix for an "unused variable" warning that appeared
- in some versions of mingw. Fixes bug 22838; bugfix on
- 0.2.8.1-alpha.
- o Minor bugfixes (coverity build support, backport from 0.3.1.5-alpha):
- - Avoid Coverity build warnings related to our BUG() macro. By
- default, Coverity treats BUG() as the Linux kernel does: an
- instant abort(). We need to override that so our BUG() macro
- doesn't prevent Coverity from analyzing functions that use it.
- Fixes bug 23030; bugfix on 0.2.9.1-alpha.
- o Minor bugfixes (directory authority, backport from 0.3.1.1-alpha):
- - When rejecting a router descriptor for running an obsolete version
- of Tor without ntor support, warn about the obsolete tor version,
- not the missing ntor key. Fixes bug 20270; bugfix on 0.2.9.3-alpha.
- o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.1.5-alpha):
- - Avoid a sandbox failure when trying to re-bind to a socket and
- mark it as IPv6-only. Fixes bug 20247; bugfix on 0.2.5.1-alpha.
- o Minor bugfixes (unit tests, backport from 0.3.1.5-alpha)
- - Fix a memory leak in the link-handshake/certs_ok_ed25519 test.
- Fixes bug 22803; bugfix on 0.3.0.1-alpha.
- Changes in version 0.3.0.9 - 2017-06-29
- Tor 0.3.0.9 fixes a path selection bug that would allow a client
- to use a guard that was in the same network family as a chosen exit
- relay. This is a security regression; all clients running earlier
- versions of 0.3.0.x or 0.3.1.x should upgrade to 0.3.0.9 or
- 0.3.1.4-alpha.
- This release also backports several other bugfixes from the 0.3.1.x
- series.
- o Major bugfixes (path selection, security, backport from 0.3.1.4-alpha):
- - When choosing which guard to use for a circuit, avoid the exit's
- family along with the exit itself. Previously, the new guard
- selection logic avoided the exit, but did not consider its family.
- Fixes bug 22753; bugfix on 0.3.0.1-alpha. Tracked as TROVE-2017-
- 006 and CVE-2017-0377.
- o Major bugfixes (entry guards, backport from 0.3.1.1-alpha):
- - Don't block bootstrapping when a primary bridge is offline and we
- can't get its descriptor. Fixes bug 22325; fixes one case of bug
- 21969; bugfix on 0.3.0.3-alpha.
- o Major bugfixes (entry guards, backport from 0.3.1.4-alpha):
- - When starting with an old consensus, do not add new entry guards
- unless the consensus is "reasonably live" (under 1 day old). Fixes
- one root cause of bug 22400; bugfix on 0.3.0.1-alpha.
- o Minor features (geoip):
- - Update geoip and geoip6 to the June 8 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (voting consistency, backport from 0.3.1.1-alpha):
- - Reject version numbers with non-numeric prefixes (such as +, -, or
- whitespace). Disallowing whitespace prevents differential version
- parsing between POSIX-based and Windows platforms. Fixes bug 21507
- and part of 21508; bugfix on 0.0.8pre1.
- o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.1.4-alpha):
- - Permit the fchmod system call, to avoid crashing on startup when
- starting with the seccomp2 sandbox and an unexpected set of
- permissions on the data directory or its contents. Fixes bug
- 22516; bugfix on 0.2.5.4-alpha.
- o Minor bugfixes (defensive programming, backport from 0.3.1.4-alpha):
- - Fix a memset() off the end of an array when packing cells. This
- bug should be harmless in practice, since the corrupted bytes are
- still in the same structure, and are always padding bytes,
- ignored, or immediately overwritten, depending on compiler
- behavior. Nevertheless, because the memset()'s purpose is to make
- sure that any other cell-handling bugs can't expose bytes to the
- network, we need to fix it. Fixes bug 22737; bugfix on
- 0.2.4.11-alpha. Fixes CID 1401591.
- Changes in version 0.3.0.8 - 2017-06-08
- Tor 0.3.0.8 fixes a pair of bugs that would allow an attacker to
- remotely crash a hidden service with an assertion failure. Anyone
- running a hidden service should upgrade to this version, or to some
- other version with fixes for TROVE-2017-004 and TROVE-2017-005.
- Tor 0.3.0.8 also includes fixes for several key management bugs
- that sometimes made relays unreliable, as well as several other
- bugfixes described below.
- o Major bugfixes (hidden service, relay, security, backport
- from 0.3.1.3-alpha):
- - Fix a remotely triggerable assertion failure when a hidden service
- handles a malformed BEGIN cell. Fixes bug 22493, tracked as
- TROVE-2017-004 and as CVE-2017-0375; bugfix on 0.3.0.1-alpha.
- - Fix a remotely triggerable assertion failure caused by receiving a
- BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
- 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
- on 0.2.2.1-alpha.
- o Major bugfixes (relay, link handshake, backport from 0.3.1.3-alpha):
- - When performing the v3 link handshake on a TLS connection, report
- that we have the x509 certificate that we actually used on that
- connection, even if we have changed certificates since that
- connection was first opened. Previously, we would claim to have
- used our most recent x509 link certificate, which would sometimes
- make the link handshake fail. Fixes one case of bug 22460; bugfix
- on 0.2.3.6-alpha.
- o Major bugfixes (relays, key management, backport from 0.3.1.3-alpha):
- - Regenerate link and authentication certificates whenever the key
- that signs them changes; also, regenerate link certificates
- whenever the signed key changes. Previously, these processes were
- only weakly coupled, and we relays could (for minutes to hours)
- wind up with an inconsistent set of keys and certificates, which
- other relays would not accept. Fixes two cases of bug 22460;
- bugfix on 0.3.0.1-alpha.
- - When sending an Ed25519 signing->link certificate in a CERTS cell,
- send the certificate that matches the x509 certificate that we
- used on the TLS connection. Previously, there was a race condition
- if the TLS context rotated after we began the TLS handshake but
- before we sent the CERTS cell. Fixes a case of bug 22460; bugfix
- on 0.3.0.1-alpha.
- o Major bugfixes (hidden service v3, backport from 0.3.1.1-alpha):
- - Stop rejecting v3 hidden service descriptors because their size
- did not match an old padding rule. Fixes bug 22447; bugfix on
- tor-0.3.0.1-alpha.
- o Minor features (fallback directory list, backport from 0.3.1.3-alpha):
- - Replace the 177 fallbacks originally introduced in Tor 0.2.9.8 in
- December 2016 (of which ~126 were still functional) with a list of
- 151 fallbacks (32 new, 119 unchanged, 58 removed) generated in May
- 2017. Resolves ticket 21564.
- o Minor bugfixes (configuration, backport from 0.3.1.1-alpha):
- - Do not crash when starting with LearnCircuitBuildTimeout 0. Fixes
- bug 22252; bugfix on 0.2.9.3-alpha.
- o Minor bugfixes (correctness, backport from 0.3.1.3-alpha):
- - Avoid undefined behavior when parsing IPv6 entries from the geoip6
- file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
- o Minor bugfixes (link handshake, backport from 0.3.1.3-alpha):
- - Lower the lifetime of the RSA->Ed25519 cross-certificate to six
- months, and regenerate it when it is within one month of expiring.
- Previously, we had generated this certificate at startup with a
- ten-year lifetime, but that could lead to weird behavior when Tor
- was started with a grossly inaccurate clock. Mitigates bug 22466;
- mitigation on 0.3.0.1-alpha.
- o Minor bugfixes (memory leak, directory authority, backport from
- 0.3.1.2-alpha):
- - When directory authorities reject a router descriptor due to
- keypinning, free the router descriptor rather than leaking the
- memory. Fixes bug 22370; bugfix on 0.2.7.2-alpha.
- Changes in version 0.2.9.11 - 2017-06-08
- Tor 0.2.9.11 backports a fix for a bug that would allow an attacker to
- remotely crash a hidden service with an assertion failure. Anyone
- running a hidden service should upgrade to this version, or to some
- other version with fixes for TROVE-2017-005. (Versions before 0.3.0
- are not affected by TROVE-2017-004.)
- Tor 0.2.9.11 also backports fixes for several key management bugs
- that sometimes made relays unreliable, as well as several other
- bugfixes described below.
- o Major bugfixes (hidden service, relay, security, backport
- from 0.3.1.3-alpha):
- - Fix a remotely triggerable assertion failure caused by receiving a
- BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
- 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
- on 0.2.2.1-alpha.
- o Major bugfixes (relay, link handshake, backport from 0.3.1.3-alpha):
- - When performing the v3 link handshake on a TLS connection, report
- that we have the x509 certificate that we actually used on that
- connection, even if we have changed certificates since that
- connection was first opened. Previously, we would claim to have
- used our most recent x509 link certificate, which would sometimes
- make the link handshake fail. Fixes one case of bug 22460; bugfix
- on 0.2.3.6-alpha.
- o Minor features (fallback directory list, backport from 0.3.1.3-alpha):
- - Replace the 177 fallbacks originally introduced in Tor 0.2.9.8 in
- December 2016 (of which ~126 were still functional) with a list of
- 151 fallbacks (32 new, 119 unchanged, 58 removed) generated in May
- 2017. Resolves ticket 21564.
- o Minor features (future-proofing, backport from 0.3.0.7):
- - Tor no longer refuses to download microdescriptors or descriptors if
- they are listed as "published in the future". This change will
- eventually allow us to stop listing meaningful "published" dates
- in microdescriptor consensuses, and thereby allow us to reduce the
- resources required to download consensus diffs by over 50%.
- Implements part of ticket 21642; implements part of proposal 275.
- o Minor features (directory authorities, backport from 0.3.0.4-rc)
- - Directory authorities now reject relays running versions
- 0.2.9.1-alpha through 0.2.9.4-alpha, because those relays
- suffer from bug 20499 and don't keep their consensus cache
- up-to-date. Resolves ticket 20509.
- o Minor features (geoip):
- - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (control port, backport from 0.3.0.6):
- - The GETINFO extra-info/digest/<digest> command was broken because
- of a wrong base16 decode return value check, introduced when
- refactoring that API. Fixes bug 22034; bugfix on 0.2.9.1-alpha.
- o Minor bugfixes (correctness, backport from 0.3.1.3-alpha):
- - Avoid undefined behavior when parsing IPv6 entries from the geoip6
- file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
- o Minor bugfixes (Linux seccomp2 sandbox, backport from 0.3.0.7):
- - The getpid() system call is now permitted under the Linux seccomp2
- sandbox, to avoid crashing with versions of OpenSSL (and other
- libraries) that attempt to learn the process's PID by using the
- syscall rather than the VDSO code. Fixes bug 21943; bugfix
- on 0.2.5.1-alpha.
- o Minor bugfixes (memory leak, directory authority, backport
- from 0.3.1.2-alpha):
- - When directory authorities reject a router descriptor due to
- keypinning, free the router descriptor rather than leaking the
- memory. Fixes bug 22370; bugfix on 0.2.7.2-alpha.
- Changes in version 0.2.8.14 - 2017-06-08
- Tor 0.2.7.8 backports a fix for a bug that would allow an attacker to
- remotely crash a hidden service with an assertion failure. Anyone
- running a hidden service should upgrade to this version, or to some
- other version with fixes for TROVE-2017-005. (Versions before 0.3.0
- are not affected by TROVE-2017-004.)
- o Major bugfixes (hidden service, relay, security):
- - Fix a remotely triggerable assertion failure caused by receiving a
- BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
- 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
- on 0.2.2.1-alpha.
- o Minor features (geoip):
- - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
- Country database.
- o Minor features (fallback directory list, backport from 0.3.1.3-alpha):
- - Replace the 177 fallbacks originally introduced in Tor 0.2.9.8 in
- December 2016 (of which ~126 were still functional) with a list of
- 151 fallbacks (32 new, 119 unchanged, 58 removed) generated in May
- 2017. Resolves ticket 21564.
- o Minor bugfixes (correctness):
- - Avoid undefined behavior when parsing IPv6 entries from the geoip6
- file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
- Changes in version 0.2.7.8 - 2017-06-08
- Tor 0.2.7.8 backports a fix for a bug that would allow an attacker to
- remotely crash a hidden service with an assertion failure. Anyone
- running a hidden service should upgrade to this version, or to some
- other version with fixes for TROVE-2017-005. (Versions before 0.3.0
- are not affected by TROVE-2017-004.)
- o Major bugfixes (hidden service, relay, security):
- - Fix a remotely triggerable assertion failure caused by receiving a
- BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
- 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
- on 0.2.2.1-alpha.
- o Minor features (geoip):
- - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (correctness):
- - Avoid undefined behavior when parsing IPv6 entries from the geoip6
- file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
- Changes in version 0.2.6.12 - 2017-06-08
- Tor 0.2.6.12 backports a fix for a bug that would allow an attacker to
- remotely crash a hidden service with an assertion failure. Anyone
- running a hidden service should upgrade to this version, or to some
- other version with fixes for TROVE-2017-005. (Versions before 0.3.0
- are not affected by TROVE-2017-004.)
- o Major bugfixes (hidden service, relay, security):
- - Fix a remotely triggerable assertion failure caused by receiving a
- BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
- 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
- on 0.2.2.1-alpha.
- o Minor features (geoip):
- - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (correctness):
- - Avoid undefined behavior when parsing IPv6 entries from the geoip6
- file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
- Changes in version 0.2.5.14 - 2017-06-08
- Tor 0.2.5.14 backports a fix for a bug that would allow an attacker to
- remotely crash a hidden service with an assertion failure. Anyone
- running a hidden service should upgrade to this version, or to some
- other version with fixes for TROVE-2017-005. (Versions before 0.3.0
- are not affected by TROVE-2017-004.)
- o Major bugfixes (hidden service, relay, security):
- - Fix a remotely triggerable assertion failure caused by receiving a
- BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
- 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
- on 0.2.2.1-alpha.
- o Minor features (geoip):
- - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (correctness):
- - Avoid undefined behavior when parsing IPv6 entries from the geoip6
- file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
- Changes in version 0.2.4.29 - 2017-06-08
- Tor 0.2.4.29 backports a fix for a bug that would allow an attacker to
- remotely crash a hidden service with an assertion failure. Anyone
- running a hidden service should upgrade to this version, or to some
- other version with fixes for TROVE-2017-005. (Versions before 0.3.0
- are not affected by TROVE-2017-004.)
- o Major bugfixes (hidden service, relay, security):
- - Fix a remotely triggerable assertion failure caused by receiving a
- BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
- 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
- on 0.2.2.1-alpha.
- o Minor features (geoip):
- - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (correctness):
- - Avoid undefined behavior when parsing IPv6 entries from the geoip6
- file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
- Changes in version 0.3.0.7 - 2017-05-15
- Tor 0.3.0.7 fixes a medium-severity security bug in earlier versions
- of Tor 0.3.0.x, where an attacker could cause a Tor relay process
- to exit. Relays running earlier versions of Tor 0.3.0.x should upgrade;
- clients are not affected.
- o Major bugfixes (hidden service directory, security):
- - Fix an assertion failure in the hidden service directory code, which
- could be used by an attacker to remotely cause a Tor relay process to
- exit. Relays running earlier versions of Tor 0.3.0.x should upgrade.
- should upgrade. This security issue is tracked as TROVE-2017-002.
- Fixes bug 22246; bugfix on 0.3.0.1-alpha.
- o Minor features:
- - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
- Country database.
- o Minor features (future-proofing):
- - Tor no longer refuses to download microdescriptors or descriptors
- if they are listed as "published in the future". This change will
- eventually allow us to stop listing meaningful "published" dates
- in microdescriptor consensuses, and thereby allow us to reduce the
- resources required to download consensus diffs by over 50%.
- Implements part of ticket 21642; implements part of proposal 275.
- o Minor bugfixes (Linux seccomp2 sandbox):
- - The getpid() system call is now permitted under the Linux seccomp2
- sandbox, to avoid crashing with versions of OpenSSL (and other
- libraries) that attempt to learn the process's PID by using the
- syscall rather than the VDSO code. Fixes bug 21943; bugfix
- on 0.2.5.1-alpha.
- Changes in version 0.3.0.6 - 2017-04-26
- Tor 0.3.0.6 is the first stable release of the Tor 0.3.0 series.
- With the 0.3.0 series, clients and relays now use Ed25519 keys to
- authenticate their link connections to relays, rather than the old
- RSA1024 keys that they used before. (Circuit crypto has been
- Curve25519-authenticated since 0.2.4.8-alpha.) We have also replaced
- the guard selection and replacement algorithm to behave more robustly
- in the presence of unreliable networks, and to resist guard-
- capture attacks.
- This series also includes numerous other small features and bugfixes,
- along with more groundwork for the upcoming hidden-services revamp.
- Per our stable release policy, we plan to support the Tor 0.3.0
- release series for at least the next nine months, or for three months
- after the first stable release of the 0.3.1 series: whichever is
- longer. If you need a release with long-term support, we recommend
- that you stay with the 0.2.9 series.
- Below are the changes since 0.2.9.10. For a list of only the changes
- since 0.3.0.5-rc, see the ChangeLog file.
- o Major features (directory authority, security):
- - The default for AuthDirPinKeys is now 1: directory authorities
- will reject relays where the RSA identity key matches a previously
- seen value, but the Ed25519 key has changed. Closes ticket 18319.
- o Major features (guard selection algorithm):
- - Tor's guard selection algorithm has been redesigned from the
- ground up, to better support unreliable networks and restrictive
- sets of entry nodes, and to better resist guard-capture attacks by
- hostile local networks. Implements proposal 271; closes
- ticket 19877.
- o Major features (next-generation hidden services):
- - Relays can now handle v3 ESTABLISH_INTRO cells as specified by
- prop224 aka "Next Generation Hidden Services". Service and clients
- don't use this functionality yet. Closes ticket 19043. Based on
- initial code by Alec Heifetz.
- - Relays now support the HSDir version 3 protocol, so that they can
- can store and serve v3 descriptors. This is part of the next-
- generation onion service work detailed in proposal 224. Closes
- ticket 17238.
- o Major features (protocol, ed25519 identity keys):
- - Clients now support including Ed25519 identity keys in the EXTEND2
- cells they generate. By default, this is controlled by a consensus
- parameter, currently disabled. You can turn this feature on for
- testing by setting ExtendByEd25519ID in your configuration. This
- might make your traffic appear different than the traffic
- generated by other users, however. Implements part of ticket
- 15056; part of proposal 220.
- - Relays now understand requests to extend to other relays by their
- Ed25519 identity keys. When an Ed25519 identity key is included in
- an EXTEND2 cell, the relay will only extend the circuit if the
- other relay can prove ownership of that identity. Implements part
- of ticket 15056; part of proposal 220.
- - Relays now use Ed25519 to prove their Ed25519 identities and to
- one another, and to clients. This algorithm is faster and more
- secure than the RSA-based handshake we've been doing until now.
- Implements the second big part of proposal 220; Closes
- ticket 15055.
- o Major features (security):
- - Change the algorithm used to decide DNS TTLs on client and server
- side, to better resist DNS-based correlation attacks like the
- DefecTor attack of Greschbach, Pulls, Roberts, Winter, and
- Feamster. Now relays only return one of two possible DNS TTL
- values, and clients are willing to believe DNS TTL values up to 3
- hours long. Closes ticket 19769.
- o Major bugfixes (client, onion service, also in 0.2.9.9):
- - Fix a client-side onion service reachability bug, where multiple
- socks requests to an onion service (or a single slow request)
- could cause us to mistakenly mark some of the service's
- introduction points as failed, and we cache that failure so
- eventually we run out and can't reach the service. Also resolves a
- mysterious "Remote server sent bogus reason code 65021" log
- warning. The bug was introduced in ticket 17218, where we tried to
- remember the circuit end reason as a uint16_t, which mangled
- negative values. Partially fixes bug 21056 and fixes bug 20307;
- bugfix on 0.2.8.1-alpha.
- o Major bugfixes (crash, directory connections):
- - Fix a rare crash when sending a begin cell on a circuit whose
- linked directory connection had already been closed. Fixes bug
- 21576; bugfix on 0.2.9.3-alpha. Reported by Alec Muffett.
- o Major bugfixes (directory authority):
- - During voting, when marking a relay as a probable sybil, do not
- clear its BadExit flag: sybils can still be bad in other ways
- too. (We still clear the other flags.) Fixes bug 21108; bugfix
- on 0.2.0.13-alpha.
- o Major bugfixes (DNS):
- - Fix a bug that prevented exit nodes from caching DNS records for
- more than 60 seconds. Fixes bug 19025; bugfix on 0.2.4.7-alpha.
- o Major bugfixes (IPv6 Exits):
- - Stop rejecting all IPv6 traffic on Exits whose exit policy rejects
- any IPv6 addresses. Instead, only reject a port over IPv6 if the
- exit policy rejects that port on more than an IPv6 /16 of
- addresses. This bug was made worse by 17027 in 0.2.8.1-alpha,
- which rejected a relay's own IPv6 address by default. Fixes bug
- 21357; bugfix on commit 004f3f4e53 in 0.2.4.7-alpha.
- o Major bugfixes (parsing):
- - Fix an integer underflow bug when comparing malformed Tor
- versions. This bug could crash Tor when built with
- --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
- 0.2.9.8, which were built with -ftrapv by default. In other cases
- it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
- on 0.0.8pre1. Found by OSS-Fuzz.
- - When parsing a malformed content-length field from an HTTP
- message, do not read off the end of the buffer. This bug was a
- potential remote denial-of-service attack against Tor clients and
- relays. A workaround was released in October 2016, to prevent this
- bug from crashing Tor. This is a fix for the underlying issue,
- which should no longer matter (if you applied the earlier patch).
- Fixes bug 20894; bugfix on 0.2.0.16-alpha. Bug found by fuzzing
- using AFL (http://lcamtuf.coredump.cx/afl/).
- o Major bugfixes (scheduler):
- - Actually compare circuit policies in ewma_cmp_cmux(). This bug
- caused the channel scheduler to behave more or less randomly,
- rather than preferring channels with higher-priority circuits.
- Fixes bug 20459; bugfix on 0.2.6.2-alpha.
- o Major bugfixes (security, also in 0.2.9.9):
- - Downgrade the "-ftrapv" option from "always on" to "only on when
- --enable-expensive-hardening is provided." This hardening option,
- like others, can turn survivable bugs into crashes--and having it
- on by default made a (relatively harmless) integer overflow bug
- into a denial-of-service bug. Fixes bug 21278 (TROVE-2017-001);
- bugfix on 0.2.9.1-alpha.
- o Minor feature (client):
- - Enable IPv6 traffic on the SocksPort by default. To disable this,
- a user will have to specify "NoIPv6Traffic". Closes ticket 21269.
- o Minor feature (fallback scripts):
- - Add a check_existing mode to updateFallbackDirs.py, which checks
- if fallbacks in the hard-coded list are working. Closes ticket
- 20174. Patch by haxxpop.
- o Minor feature (protocol versioning):
- - Add new protocol version for proposal 224. HSIntro now advertises
- version "3-4" and HSDir version "1-2". Fixes ticket 20656.
- o Minor features (ciphersuite selection):
- - Allow relays to accept a wider range of ciphersuites, including
- chacha20-poly1305 and AES-CCM. Closes the other part of 15426.
- - Clients now advertise a list of ciphersuites closer to the ones
- preferred by Firefox. Closes part of ticket 15426.
- o Minor features (controller):
- - Add "GETINFO sr/current" and "GETINFO sr/previous" keys, to expose
- shared-random values to the controller. Closes ticket 19925.
- - When HSFETCH arguments cannot be parsed, say "Invalid argument"
- rather than "unrecognized." Closes ticket 20389; patch from
- Ivan Markin.
- o Minor features (controller, configuration):
- - Each of the *Port options, such as SocksPort, ORPort, ControlPort,
- and so on, now comes with a __*Port variant that will not be saved
- to the torrc file by the controller's SAVECONF command. This
- change allows TorBrowser to set up a single-use domain socket for
- each time it launches Tor. Closes ticket 20956.
- - The GETCONF command can now query options that may only be
- meaningful in context-sensitive lists. This allows the controller
- to query the mixed SocksPort/__SocksPort style options introduced
- in feature 20956. Implements ticket 21300.
- o Minor features (diagnostic, directory client):
- - Warn when we find an unexpected inconsistency in directory
- download status objects. Prevents some negative consequences of
- bug 20593.
- o Minor features (directory authorities):
- - Directory authorities now reject descriptors that claim to be
- malformed versions of Tor. Helps prevent exploitation of
- bug 21278.
- - Reject version numbers with components that exceed INT32_MAX.
- Otherwise 32-bit and 64-bit platforms would behave inconsistently.
- Fixes bug 21450; bugfix on 0.0.8pre1.
- o Minor features (directory authority):
- - Add a new authority-only AuthDirTestEd25519LinkKeys option (on by
- default) to control whether authorities should try to probe relays
- by their Ed25519 link keys. This option will go away in a few
- releases--unless we encounter major trouble in our ed25519 link
- protocol rollout, in which case it will serve as a safety option.
- o Minor features (directory cache):
- - Relays and bridges will now refuse to serve the consensus they
- have if they know it is too old for a client to use. Closes
- ticket 20511.
- o Minor features (ed25519 link handshake):
- - Advertise support for the ed25519 link handshake using the
- subprotocol-versions mechanism, so that clients can tell which
- relays can identity themselves by Ed25519 ID. Closes ticket 20552.
- o Minor features (entry guards):
- - Add UseEntryGuards to TEST_OPTIONS_DEFAULT_VALUES in order to not
- break regression tests.
- - Require UseEntryGuards when UseBridges is set, in order to make
- sure bridges aren't bypassed. Resolves ticket 20502.
- o Minor features (fallback directories):
- - Allow 3 fallback relays per operator, which is safe now that we
- are choosing 200 fallback relays. Closes ticket 20912.
- - Annotate updateFallbackDirs.py with the bandwidth and consensus
- weight for each candidate fallback. Closes ticket 20878.
- - Display the relay fingerprint when downloading consensuses from
- fallbacks. Closes ticket 20908.
- - Exclude relays affected by bug 20499 from the fallback list.
- Exclude relays from the fallback list if they are running versions
- known to be affected by bug 20499, or if in our tests they deliver
- a stale consensus (i.e. one that expired more than 24 hours ago).
- Closes ticket 20539.
- - Make it easier to change the output sort order of fallbacks.
- Closes ticket 20822.
- - Reduce the minimum fallback bandwidth to 1 MByte/s. Part of
- ticket 18828.
- - Require fallback directories to have the same address and port for
- 7 days (now that we have enough relays with this stability).
- Relays whose OnionOO stability timer is reset on restart by bug
- 18050 should upgrade to Tor 0.2.8.7 or later, which has a fix for
- this issue. Closes ticket 20880; maintains short-term fix
- in 0.2.8.2-alpha.
- - Require fallbacks to have flags for 90% of the time (weighted
- decaying average), rather than 95%. This allows at least 73% of
- clients to bootstrap in the first 5 seconds without contacting an
- authority. Part of ticket 18828.
- - Select 200 fallback directories for each release. Closes
- ticket 20881.
- o Minor features (fingerprinting resistance, authentication):
- - Extend the length of RSA keys used for TLS link authentication to
- 2048 bits. (These weren't used for forward secrecy; for forward
- secrecy, we used P256.) Closes ticket 13752.
- o Minor features (geoip):
- - Update geoip and geoip6 to the April 4 2017 Maxmind GeoLite2
- Country database.
- o Minor features (geoip, also in 0.2.9.9):
- - Update geoip and geoip6 to the January 4 2017 Maxmind GeoLite2
- Country database.
- o Minor features (infrastructure):
- - Implement smartlist_add_strdup() function. Replaces the use of
- smartlist_add(sl, tor_strdup(str)). Closes ticket 20048.
- o Minor features (linting):
- - Enhance the changes file linter to warn on Tor versions that are
- prefixed with "tor-". Closes ticket 21096.
- o Minor features (logging):
- - In several places, describe unset ed25519 keys as "<unset>",
- rather than the scary "AAAAAAAA...AAA". Closes ticket 21037.
- o Minor features (portability, compilation):
- - Autoconf now checks to determine if OpenSSL structures are opaque,
- instead of explicitly checking for OpenSSL version numbers. Part
- of ticket 21359.
- - Support building with recent LibreSSL code that uses opaque
- structures. Closes ticket 21359.
- o Minor features (relay):
- - We now allow separation of exit and relay traffic to different
- source IP addresses, using the OutboundBindAddressExit and
- OutboundBindAddressOR options respectively. Closes ticket 17975.
- Written by Michael Sonntag.
- o Minor features (reliability, crash):
- - Try better to detect problems in buffers where they might grow (or
- think they have grown) over 2 GB in size. Diagnostic for
- bug 21369.
- o Minor features (testing):
- - During 'make test-network-all', if tor logs any warnings, ask
- chutney to output them. Requires a recent version of chutney with
- the 21572 patch. Implements 21570.
- o Minor bugfix (control protocol):
- - The reply to a "GETINFO config/names" request via the control
- protocol now spells the type "Dependent" correctly. This is a
- breaking change in the control protocol. (The field seems to be
- ignored by the most common known controllers.) Fixes bug 18146;
- bugfix on 0.1.1.4-alpha.
- - The GETINFO extra-info/digest/<digest> command was broken because
- of a wrong base16 decode return value check, introduced when
- refactoring that API. Fixes bug 22034; bugfix on 0.2.9.1-alpha.
- o Minor bugfix (logging):
- - Don't recommend the use of Tor2web in non-anonymous mode.
- Recommending Tor2web is a bad idea because the client loses all
- anonymity. Tor2web should only be used in specific cases by users
- who *know* and understand the issues. Fixes bug 21294; bugfix
- on 0.2.9.3-alpha.
- o Minor bugfixes (bug resilience):
- - Fix an unreachable size_t overflow in base64_decode(). Fixes bug
- 19222; bugfix on 0.2.0.9-alpha. Found by Guido Vranken; fixed by
- Hans Jerry Illikainen.
- o Minor bugfixes (build):
- - Replace obsolete Autoconf macros with their modern equivalent and
- prevent similar issues in the future. Fixes bug 20990; bugfix
- on 0.1.0.1-rc.
- o Minor bugfixes (certificate expiration time):
- - Avoid using link certificates that don't become valid till some
- time in the future. Fixes bug 21420; bugfix on 0.2.4.11-alpha
- o Minor bugfixes (client):
- - Always recover from failures in extend_info_from_node(), in an
- attempt to prevent any recurrence of bug 21242. Fixes bug 21372;
- bugfix on 0.2.3.1-alpha.
- - When clients that use bridges start up with a cached consensus on
- disk, they were ignoring it and downloading a new one. Now they
- use the cached one. Fixes bug 20269; bugfix on 0.2.3.12-alpha.
- o Minor bugfixes (code correctness):
- - Repair a couple of (unreachable or harmless) cases of the risky
- comparison-by-subtraction pattern that caused bug 21278.
- o Minor bugfixes (config):
- - Don't assert on startup when trying to get the options list and
- LearnCircuitBuildTimeout is set to 0: we are currently parsing the
- options so of course they aren't ready yet. Fixes bug 21062;
- bugfix on 0.2.9.3-alpha.
- o Minor bugfixes (configuration):
- - Accept non-space whitespace characters after the severity level in
- the `Log` option. Fixes bug 19965; bugfix on 0.2.1.1-alpha.
- - Support "TByte" and "TBytes" units in options given in bytes.
- "TB", "terabyte(s)", "TBit(s)" and "terabit(s)" were already
- supported. Fixes bug 20622; bugfix on 0.2.0.14-alpha.
- o Minor bugfixes (configure, autoconf):
- - Rename the configure option --enable-expensive-hardening to
- --enable-fragile-hardening. Expensive hardening makes the tor
- daemon abort when some kinds of issues are detected. Thus, it
- makes tor more at risk of remote crashes but safer against RCE or
- heartbleed bug category. We now try to explain this issue in a
- message from the configure script. Fixes bug 21290; bugfix
- on 0.2.5.4-alpha.
- o Minor bugfixes (consensus weight):
- - Add new consensus method that initializes bw weights to 1 instead
- of 0. This prevents a zero weight from making it all the way to
- the end (happens in small testing networks) and causing an error.
- Fixes bug 14881; bugfix on 0.2.2.17-alpha.
- o Minor bugfixes (crash prevention):
- - Fix an (currently untriggerable, but potentially dangerous) crash
- bug when base32-encoding inputs whose sizes are not a multiple of
- 5. Fixes bug 21894; bugfix on 0.2.9.1-alpha.
- o Minor bugfixes (dead code):
- - Remove a redundant check for PidFile changes at runtime in
- options_transition_allowed(): this check is already performed
- regardless of whether the sandbox is active. Fixes bug 21123;
- bugfix on 0.2.5.4-alpha.
- o Minor bugfixes (descriptors):
- - Correctly recognise downloaded full descriptors as valid, even
- when using microdescriptors as circuits. This affects clients with
- FetchUselessDescriptors set, and may affect directory authorities.
- Fixes bug 20839; bugfix on 0.2.3.2-alpha.
- o Minor bugfixes (directory mirrors):
- - Allow relays to use directory mirrors without a DirPort: these
- relays need to be contacted over their ORPorts using a begindir
- connection. Fixes one case of bug 20711; bugfix on 0.2.8.2-alpha.
- - Clarify the message logged when a remote relay is unexpectedly
- missing an ORPort or DirPort: users were confusing this with a
- local port. Fixes another case of bug 20711; bugfix
- on 0.2.8.2-alpha.
- o Minor bugfixes (directory system):
- - Bridges and relays now use microdescriptors (like clients do)
- rather than old-style router descriptors. Now bridges will blend
- in with clients in terms of the circuits they build. Fixes bug
- 6769; bugfix on 0.2.3.2-alpha.
- - Download all consensus flavors, descriptors, and authority
- certificates when FetchUselessDescriptors is set, regardless of
- whether tor is a directory cache or not. Fixes bug 20667; bugfix
- on all recent tor versions.
- o Minor bugfixes (documentation):
- - Update the tor manual page to document every option that can not
- be changed while tor is running. Fixes bug 21122.
- o Minor bugfixes (ed25519 certificates):
- - Correctly interpret ed25519 certificates that would expire some
- time after 19 Jan 2038. Fixes bug 20027; bugfix on 0.2.7.2-alpha.
- o Minor bugfixes (fallback directories):
- - Avoid checking fallback candidates' DirPorts if they are down in
- OnionOO. When a relay operator has multiple relays, this
- prioritizes relays that are up over relays that are down. Fixes
- bug 20926; bugfix on 0.2.8.3-alpha.
- - Stop failing when OUTPUT_COMMENTS is True in updateFallbackDirs.py.
- Fixes bug 20877; bugfix on 0.2.8.3-alpha.
- - Stop failing when a relay has no uptime data in
- updateFallbackDirs.py. Fixes bug 20945; bugfix on 0.2.8.1-alpha.
- o Minor bugfixes (hidden service):
- - Clean up the code for expiring intro points with no associated
- circuits. It was causing, rarely, a service with some expiring
- introduction points to not open enough additional introduction
- points. Fixes part of bug 21302; bugfix on 0.2.7.2-alpha.
- - Resolve two possible underflows which could lead to creating and
- closing a lot of introduction point circuits in a non-stop loop.
- Fixes bug 21302; bugfix on 0.2.7.2-alpha.
- - Stop setting the torrc option HiddenServiceStatistics to "0" just
- because we're not a bridge or relay. Instead, we preserve whatever
- value the user set (or didn't set). Fixes bug 21150; bugfix
- on 0.2.6.2-alpha.
- o Minor bugfixes (hidden services):
- - Make hidden services check for failed intro point connections,
- even when they have exceeded their intro point creation limit.
- Fixes bug 21596; bugfix on 0.2.7.2-alpha. Reported by Alec Muffett.
- - Make hidden services with 8 to 10 introduction points check for
- failed circuits immediately after startup. Previously, they would
- wait for 5 minutes before performing their first checks. Fixes bug
- 21594; bugfix on 0.2.3.9-alpha. Reported by Alec Muffett.
- - Stop ignoring misconfigured hidden services. Instead, refuse to
- start tor until the misconfigurations have been corrected. Fixes
- bug 20559; bugfix on multiple commits in 0.2.7.1-alpha
- and earlier.
- o Minor bugfixes (IPv6):
- - Make IPv6-using clients try harder to find an IPv6 directory
- server. Fixes bug 20999; bugfix on 0.2.8.2-alpha.
- - When IPv6 addresses have not been downloaded yet (microdesc
- consensus documents don't list relay IPv6 addresses), use hard-
- coded addresses for authorities, fallbacks, and configured
- bridges. Now IPv6-only clients can use microdescriptors. Fixes bug
- 20996; bugfix on b167e82 from 19608 in 0.2.8.5-alpha.
- o Minor bugfixes (memory leak at exit):
- - Fix a small harmless memory leak at exit of the previously unused
- RSA->Ed identity cross-certificate. Fixes bug 17779; bugfix
- on 0.2.7.2-alpha.
- o Minor bugfixes (onion services):
- - Allow the number of introduction points to be as low as 0, rather
- than as low as 3. Fixes bug 21033; bugfix on 0.2.7.2-alpha.
- o Minor bugfixes (portability):
- - Use "OpenBSD" compiler macro instead of "OPENBSD" or "__OpenBSD__".
- It is supported by OpenBSD itself, and also by most OpenBSD
- variants (such as Bitrig). Fixes bug 20980; bugfix
- on 0.1.2.1-alpha.
- o Minor bugfixes (portability, also in 0.2.9.9):
- - Avoid crashing when Tor is built using headers that contain
- CLOCK_MONOTONIC_COARSE, but then tries to run on an older kernel
- without CLOCK_MONOTONIC_COARSE. Fixes bug 21035; bugfix
- on 0.2.9.1-alpha.
- - Fix Libevent detection on platforms without Libevent 1 headers
- installed. Fixes bug 21051; bugfix on 0.2.9.1-alpha.
- o Minor bugfixes (relay):
- - Avoid a double-marked-circuit warning that could happen when we
- receive DESTROY cells under heavy load. Fixes bug 20059; bugfix
- on 0.1.0.1-rc.
- - Honor DataDirectoryGroupReadable when tor is a relay. Previously,
- initializing the keys would reset the DataDirectory to 0700
- instead of 0750 even if DataDirectoryGroupReadable was set to 1.
- Fixes bug 19953; bugfix on 0.0.2pre16. Patch by "redfish".
- o Minor bugfixes (testing):
- - Fix Raspbian build issues related to missing socket errno in
- test_util.c. Fixes bug 21116; bugfix on 0.2.8.2. Patch by "hein".
- - Remove undefined behavior from the backtrace generator by removing
- its signal handler. Fixes bug 21026; bugfix on 0.2.5.2-alpha.
- - Use bash in src/test/test-network.sh. This ensures we reliably
- call chutney's newer tools/test-network.sh when available. Fixes
- bug 21562; bugfix on 0.2.9.1-alpha.
- o Minor bugfixes (tor-resolve):
- - The tor-resolve command line tool now rejects hostnames over 255
- characters in length. Previously, it would silently truncate them,
- which could lead to bugs. Fixes bug 21280; bugfix on 0.0.9pre5.
- Patch by "junglefowl".
- o Minor bugfixes (unit tests):
- - Allow the unit tests to pass even when DNS lookups of bogus
- addresses do not fail as expected. Fixes bug 20862 and 20863;
- bugfix on unit tests introduced in 0.2.8.1-alpha
- through 0.2.9.4-alpha.
- o Minor bugfixes (util):
- - When finishing writing a file to disk, if we were about to replace
- the file with the temporary file created before and we fail to
- replace it, remove the temporary file so it doesn't stay on disk.
- Fixes bug 20646; bugfix on 0.2.0.7-alpha. Patch by fk.
- o Minor bugfixes (Windows services):
- - Be sure to initialize the monotonic time subsystem before using
- it, even when running as an NT service. Fixes bug 21356; bugfix
- on 0.2.9.1-alpha.
- o Minor bugfixes (Windows):
- - Check for getpagesize before using it to mmap files. This fixes
- compilation in some MinGW environments. Fixes bug 20530; bugfix on
- 0.1.2.1-alpha. Reported by "ice".
- o Code simplification and refactoring:
- - Abolish all global guard context in entrynodes.c; replace with new
- guard_selection_t structure as preparation for proposal 271.
- Closes ticket 19858.
- - Extract magic numbers in circuituse.c into defined variables.
- - Introduce rend_service_is_ephemeral() that tells if given onion
- service is ephemeral. Replace unclear NULL-checkings for service
- directory with this function. Closes ticket 20526.
- - Refactor circuit_is_available_for_use to remove unnecessary check.
- - Refactor circuit_predict_and_launch_new for readability and
- testability. Closes ticket 18873.
- - Refactor code to manipulate global_origin_circuit_list into
- separate functions. Closes ticket 20921.
- - Refactor large if statement in purpose_needs_anonymity to use
- switch statement instead. Closes part of ticket 20077.
- - Refactor the hashing API to return negative values for errors, as
- is done as throughout the codebase. Closes ticket 20717.
- - Remove data structures that were used to index or_connection
- objects by their RSA identity digests. These structures are fully
- redundant with the similar structures used in the
- channel abstraction.
- - Remove duplicate code in the channel_write_*cell() functions.
- Closes ticket 13827; patch from Pingl.
- - Remove redundant behavior of is_sensitive_dir_purpose, refactor to
- use only purpose_needs_anonymity. Closes part of ticket 20077.
- - The code to generate and parse EXTEND and EXTEND2 cells has been
- replaced with code automatically generated by the
- "trunnel" utility.
- o Documentation (formatting):
- - Clean up formatting of tor.1 man page and HTML doc, where <pre>
- blocks were incorrectly appearing. Closes ticket 20885.
- o Documentation (man page):
- - Clarify many options in tor.1 and add some min/max values for
- HiddenService options. Closes ticket 21058.
- o Documentation:
- - Change '1' to 'weight_scale' in consensus bw weights calculation
- comments, as that is reality. Closes ticket 20273. Patch
- from pastly.
- - Clarify that when ClientRejectInternalAddresses is enabled (which
- is the default), multicast DNS hostnames for machines on the local
- network (of the form *.local) are also rejected. Closes
- ticket 17070.
- - Correct the value for AuthDirGuardBWGuarantee in the manpage, from
- 250 KBytes to 2 MBytes. Fixes bug 20435; bugfix on 0.2.5.6-alpha.
- - Include the "TBits" unit in Tor's man page. Fixes part of bug
- 20622; bugfix on 0.2.5.1-alpha.
- - Small fixes to the fuzzing documentation. Closes ticket 21472.
- - Stop the man page from incorrectly stating that HiddenServiceDir
- must already exist. Fixes 20486.
- - Update the description of the directory server options in the
- manual page, to clarify that a relay no longer needs to set
- DirPort in order to be a directory cache. Closes ticket 21720.
- o Removed features:
- - The AuthDirMaxServersPerAuthAddr option no longer exists: The same
- limit for relays running on a single IP applies to authority IP
- addresses as well as to non-authority IP addresses. Closes
- ticket 20960.
- - The UseDirectoryGuards torrc option no longer exists: all users
- that use entry guards will also use directory guards. Related to
- proposal 271; implements part of ticket 20831.
- o Testing:
- - Add tests for networkstatus_compute_bw_weights_v10.
- - Add unit tests circuit_predict_and_launch_new.
- - Extract dummy_origin_circuit_new so it can be used by other
- test functions.
- - New unit tests for tor_htonll(). Closes ticket 19563. Patch
- from "overcaffeinated".
- - Perform the coding style checks when running the tests and fail
- when coding style violations are found. Closes ticket 5500.
- Changes in version 0.2.8.13 - 2017-03-03
- Tor 0.2.8.13 backports a security fix from later Tor
- releases. Anybody running Tor 0.2.8.12 or earlier should upgrade to this
- this release, if for some reason they cannot upgrade to a later
- release series, and if they build Tor with the --enable-expensive-hardening
- option.
- Note that support for Tor 0.2.8.x is ending next year: we will not issue
- any fixes for the Tor 0.2.8.x series after 1 Jan 2018. If you need
- a Tor release series with longer-term support, we recommend Tor 0.2.9.x.
- o Major bugfixes (parsing, backported from 0.3.0.4-rc):
- - Fix an integer underflow bug when comparing malformed Tor
- versions. This bug could crash Tor when built with
- --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
- 0.2.9.8, which were built with -ftrapv by default. In other cases
- it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
- on 0.0.8pre1. Found by OSS-Fuzz.
- o Minor features (geoip):
- - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
- Country database.
- Changes in version 0.2.7.7 - 2017-03-03
- Tor 0.2.7.7 backports a number of security fixes from later Tor
- releases. Anybody running Tor 0.2.7.6 or earlier should upgrade to
- this release, if for some reason they cannot upgrade to a later
- release series.
- Note that support for Tor 0.2.7.x is ending this year: we will not issue
- any fixes for the Tor 0.2.7.x series after 1 August 2017. If you need
- a Tor release series with longer-term support, we recommend Tor 0.2.9.x.
- o Directory authority changes (backport from 0.2.8.5-rc):
- - Urras is no longer a directory authority. Closes ticket 19271.
- o Directory authority changes (backport from 0.2.9.2-alpha):
- - The "Tonga" bridge authority has been retired; the new bridge
- authority is "Bifroest". Closes tickets 19728 and 19690.
- o Directory authority key updates (backport from 0.2.8.1-alpha):
- - Update the V3 identity key for the dannenberg directory authority:
- it was changed on 18 November 2015. Closes task 17906. Patch
- by "teor".
- o Major bugfixes (parsing, security, backport from 0.2.9.8):
- - Fix a bug in parsing that could cause clients to read a single
- byte past the end of an allocated region. This bug could be used
- to cause hardened clients (built with --enable-expensive-hardening)
- to crash if they tried to visit a hostile hidden service. Non-
- hardened clients are only affected depending on the details of
- their platform's memory allocator. Fixes bug 21018; bugfix on
- 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
- 2016-12-002 and as CVE-2016-1254.
- o Major bugfixes (security, client, DNS proxy, backport from 0.2.8.3-alpha):
- - Stop a crash that could occur when a client running with DNSPort
- received a query with multiple address types, and the first
- address type was not supported. Found and fixed by Scott Dial.
- Fixes bug 18710; bugfix on 0.2.5.4-alpha.
- - Prevent a class of security bugs caused by treating the contents
- of a buffer chunk as if they were a NUL-terminated string. At
- least one such bug seems to be present in all currently used
- versions of Tor, and would allow an attacker to remotely crash
- most Tor instances, especially those compiled with extra compiler
- hardening. With this defense in place, such bugs can't crash Tor,
- though we should still fix them as they occur. Closes ticket
- 20384 (TROVE-2016-10-001).
- o Major bugfixes (security, pointers, backport from 0.2.8.2-alpha):
- - Avoid a difficult-to-trigger heap corruption attack when extending
- a smartlist to contain over 16GB of pointers. Fixes bug 18162;
- bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
- Reported by Guido Vranken.
- o Major bugfixes (dns proxy mode, crash, backport from 0.2.8.2-alpha):
- - Avoid crashing when running as a DNS proxy. Fixes bug 16248;
- bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
- o Major bugfixes (key management, backport from 0.2.8.3-alpha):
- - If OpenSSL fails to generate an RSA key, do not retain a dangling
- pointer to the previous (uninitialized) key value. The impact here
- should be limited to a difficult-to-trigger crash, if OpenSSL is
- running an engine that makes key generation failures possible, or
- if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
- 0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
- Baishakhi Ray.
- o Major bugfixes (parsing, backported from 0.3.0.4-rc):
- - Fix an integer underflow bug when comparing malformed Tor
- versions. This bug could crash Tor when built with
- --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
- 0.2.9.8, which were built with -ftrapv by default. In other cases
- it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
- on 0.0.8pre1. Found by OSS-Fuzz.
- o Minor features (security, memory erasure, backport from 0.2.8.1-alpha):
- - Make memwipe() do nothing when passed a NULL pointer or buffer of
- zero size. Check size argument to memwipe() for underflow. Fixes
- bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
- patch by "teor".
- o Minor features (bug-resistance, backport from 0.2.8.2-alpha):
- - Make Tor survive errors involving connections without a
- corresponding event object. Previously we'd fail with an
- assertion; now we produce a log message. Related to bug 16248.
- o Minor features (geoip):
- - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
- Country database.
- Changes in version 0.2.6.11 - 2017-03-03
- Tor 0.2.6.11 backports a number of security fixes from later Tor
- releases. Anybody running Tor 0.2.6.10 or earlier should upgrade to
- this release, if for some reason they cannot upgrade to a later
- release series.
- Note that support for Tor 0.2.6.x is ending this year: we will not issue
- any fixes for the Tor 0.2.6.x series after 1 August 2017. If you need
- a Tor release series with longer-term support, we recommend Tor 0.2.9.x.
- o Directory authority changes (backport from 0.2.8.5-rc):
- - Urras is no longer a directory authority. Closes ticket 19271.
- o Directory authority changes (backport from 0.2.9.2-alpha):
- - The "Tonga" bridge authority has been retired; the new bridge
- authority is "Bifroest". Closes tickets 19728 and 19690.
- o Directory authority key updates (backport from 0.2.8.1-alpha):
- - Update the V3 identity key for the dannenberg directory authority:
- it was changed on 18 November 2015. Closes task 17906. Patch
- by "teor".
- o Major features (security fixes, backport from 0.2.9.4-alpha):
- - Prevent a class of security bugs caused by treating the contents
- of a buffer chunk as if they were a NUL-terminated string. At
- least one such bug seems to be present in all currently used
- versions of Tor, and would allow an attacker to remotely crash
- most Tor instances, especially those compiled with extra compiler
- hardening. With this defense in place, such bugs can't crash Tor,
- though we should still fix them as they occur. Closes ticket
- 20384 (TROVE-2016-10-001).
- o Major bugfixes (parsing, security, backport from 0.2.9.8):
- - Fix a bug in parsing that could cause clients to read a single
- byte past the end of an allocated region. This bug could be used
- to cause hardened clients (built with --enable-expensive-hardening)
- to crash if they tried to visit a hostile hidden service. Non-
- hardened clients are only affected depending on the details of
- their platform's memory allocator. Fixes bug 21018; bugfix on
- 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
- 2016-12-002 and as CVE-2016-1254.
- o Major bugfixes (security, client, DNS proxy, backport from 0.2.8.3-alpha):
- - Stop a crash that could occur when a client running with DNSPort
- received a query with multiple address types, and the first
- address type was not supported. Found and fixed by Scott Dial.
- Fixes bug 18710; bugfix on 0.2.5.4-alpha.
- o Major bugfixes (security, correctness, backport from 0.2.7.4-rc):
- - Fix an error that could cause us to read 4 bytes before the
- beginning of an openssl string. This bug could be used to cause
- Tor to crash on systems with unusual malloc implementations, or
- systems with unusual hardening installed. Fixes bug 17404; bugfix
- on 0.2.3.6-alpha.
- o Major bugfixes (security, pointers, backport from 0.2.8.2-alpha):
- - Avoid a difficult-to-trigger heap corruption attack when extending
- a smartlist to contain over 16GB of pointers. Fixes bug 18162;
- bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
- Reported by Guido Vranken.
- o Major bugfixes (dns proxy mode, crash, backport from 0.2.8.2-alpha):
- - Avoid crashing when running as a DNS proxy. Fixes bug 16248;
- bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
- o Major bugfixes (guard selection, backport from 0.2.7.6):
- - Actually look at the Guard flag when selecting a new directory
- guard. When we implemented the directory guard design, we
- accidentally started treating all relays as if they have the Guard
- flag during guard selection, leading to weaker anonymity and worse
- performance. Fixes bug 17772; bugfix on 0.2.4.8-alpha. Discovered
- by Mohsen Imani.
- o Major bugfixes (key management, backport from 0.2.8.3-alpha):
- - If OpenSSL fails to generate an RSA key, do not retain a dangling
- pointer to the previous (uninitialized) key value. The impact here
- should be limited to a difficult-to-trigger crash, if OpenSSL is
- running an engine that makes key generation failures possible, or
- if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
- 0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
- Baishakhi Ray.
- o Major bugfixes (parsing, backported from 0.3.0.4-rc):
- - Fix an integer underflow bug when comparing malformed Tor
- versions. This bug could crash Tor when built with
- --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
- 0.2.9.8, which were built with -ftrapv by default. In other cases
- it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
- on 0.0.8pre1. Found by OSS-Fuzz.
- o Minor features (security, memory erasure, backport from 0.2.8.1-alpha):
- - Make memwipe() do nothing when passed a NULL pointer or buffer of
- zero size. Check size argument to memwipe() for underflow. Fixes
- bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
- patch by "teor".
- o Minor features (bug-resistance, backport from 0.2.8.2-alpha):
- - Make Tor survive errors involving connections without a
- corresponding event object. Previously we'd fail with an
- assertion; now we produce a log message. Related to bug 16248.
- o Minor features (geoip):
- - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (compilation, backport from 0.2.7.6):
- - Fix a compilation warning with Clang 3.6: Do not check the
- presence of an address which can never be NULL. Fixes bug 17781.
- Changes in version 0.2.5.13 - 2017-03-03
- Tor 0.2.5.13 backports a number of security fixes from later Tor
- releases. Anybody running Tor 0.2.5.13 or earlier should upgrade to
- this release, if for some reason they cannot upgrade to a later
- release series.
- Note that support for Tor 0.2.5.x is ending next year: we will not issue
- any fixes for the Tor 0.2.5.x series after 1 May 2018. If you need
- a Tor release series with longer-term support, we recommend Tor 0.2.9.x.
- o Directory authority changes (backport from 0.2.8.5-rc):
- - Urras is no longer a directory authority. Closes ticket 19271.
- o Directory authority changes (backport from 0.2.9.2-alpha):
- - The "Tonga" bridge authority has been retired; the new bridge
- authority is "Bifroest". Closes tickets 19728 and 19690.
- o Directory authority key updates (backport from 0.2.8.1-alpha):
- - Update the V3 identity key for the dannenberg directory authority:
- it was changed on 18 November 2015. Closes task 17906. Patch
- by "teor".
- o Major features (security fixes, backport from 0.2.9.4-alpha):
- - Prevent a class of security bugs caused by treating the contents
- of a buffer chunk as if they were a NUL-terminated string. At
- least one such bug seems to be present in all currently used
- versions of Tor, and would allow an attacker to remotely crash
- most Tor instances, especially those compiled with extra compiler
- hardening. With this defense in place, such bugs can't crash Tor,
- though we should still fix them as they occur. Closes ticket
- 20384 (TROVE-2016-10-001).
- o Major bugfixes (parsing, security, backport from 0.2.9.8):
- - Fix a bug in parsing that could cause clients to read a single
- byte past the end of an allocated region. This bug could be used
- to cause hardened clients (built with --enable-expensive-hardening)
- to crash if they tried to visit a hostile hidden service. Non-
- hardened clients are only affected depending on the details of
- their platform's memory allocator. Fixes bug 21018; bugfix on
- 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
- 2016-12-002 and as CVE-2016-1254.
- o Major bugfixes (security, client, DNS proxy, backport from 0.2.8.3-alpha):
- - Stop a crash that could occur when a client running with DNSPort
- received a query with multiple address types, and the first
- address type was not supported. Found and fixed by Scott Dial.
- Fixes bug 18710; bugfix on 0.2.5.4-alpha.
- o Major bugfixes (security, correctness, backport from 0.2.7.4-rc):
- - Fix an error that could cause us to read 4 bytes before the
- beginning of an openssl string. This bug could be used to cause
- Tor to crash on systems with unusual malloc implementations, or
- systems with unusual hardening installed. Fixes bug 17404; bugfix
- on 0.2.3.6-alpha.
- o Major bugfixes (security, pointers, backport from 0.2.8.2-alpha):
- - Avoid a difficult-to-trigger heap corruption attack when extending
- a smartlist to contain over 16GB of pointers. Fixes bug 18162;
- bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
- Reported by Guido Vranken.
- o Major bugfixes (dns proxy mode, crash, backport from 0.2.8.2-alpha):
- - Avoid crashing when running as a DNS proxy. Fixes bug 16248;
- bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
- o Major bugfixes (guard selection, backport from 0.2.7.6):
- - Actually look at the Guard flag when selecting a new directory
- guard. When we implemented the directory guard design, we
- accidentally started treating all relays as if they have the Guard
- flag during guard selection, leading to weaker anonymity and worse
- performance. Fixes bug 17772; bugfix on 0.2.4.8-alpha. Discovered
- by Mohsen Imani.
- o Major bugfixes (key management, backport from 0.2.8.3-alpha):
- - If OpenSSL fails to generate an RSA key, do not retain a dangling
- pointer to the previous (uninitialized) key value. The impact here
- should be limited to a difficult-to-trigger crash, if OpenSSL is
- running an engine that makes key generation failures possible, or
- if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
- 0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
- Baishakhi Ray.
- o Major bugfixes (parsing, backported from 0.3.0.4-rc):
- - Fix an integer underflow bug when comparing malformed Tor
- versions. This bug could crash Tor when built with
- --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
- 0.2.9.8, which were built with -ftrapv by default. In other cases
- it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
- on 0.0.8pre1. Found by OSS-Fuzz.
- o Minor features (security, memory erasure, backport from 0.2.8.1-alpha):
- - Make memwipe() do nothing when passed a NULL pointer or buffer of
- zero size. Check size argument to memwipe() for underflow. Fixes
- bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
- patch by "teor".
- o Minor features (bug-resistance, backport from 0.2.8.2-alpha):
- - Make Tor survive errors involving connections without a
- corresponding event object. Previously we'd fail with an
- assertion; now we produce a log message. Related to bug 16248.
- o Minor features (geoip):
- - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (compilation, backport from 0.2.7.6):
- - Fix a compilation warning with Clang 3.6: Do not check the
- presence of an address which can never be NULL. Fixes bug 17781.
- o Minor bugfixes (crypto error-handling, backport from 0.2.7.2-alpha):
- - Check for failures from crypto_early_init, and refuse to continue.
- A previous typo meant that we could keep going with an
- uninitialized crypto library, and would have OpenSSL initialize
- its own PRNG. Fixes bug 16360; bugfix on 0.2.5.2-alpha, introduced
- when implementing ticket 4900. Patch by "teor".
- o Minor bugfixes (hidden service, backport from 0.2.7.1-alpha):
- - Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
- a client authorized hidden service. Fixes bug 15823; bugfix
- on 0.2.1.6-alpha.
- Changes in version 0.2.4.28 - 2017-03-03
- Tor 0.2.4.28 backports a number of security fixes from later Tor
- releases. Anybody running Tor 0.2.4.27 or earlier should upgrade to
- this release, if for some reason they cannot upgrade to a later
- release series.
- Note that support for Tor 0.2.4.x is ending soon: we will not issue
- any fixes for the Tor 0.2.4.x series after 1 August 2017. If you need
- a Tor release series with long-term support, we recommend Tor 0.2.9.x.
- o Directory authority changes (backport from 0.2.8.5-rc):
- - Urras is no longer a directory authority. Closes ticket 19271.
- o Directory authority changes (backport from 0.2.9.2-alpha):
- - The "Tonga" bridge authority has been retired; the new bridge
- authority is "Bifroest". Closes tickets 19728 and 19690.
- o Directory authority key updates (backport from 0.2.8.1-alpha):
- - Update the V3 identity key for the dannenberg directory authority:
- it was changed on 18 November 2015. Closes task 17906. Patch
- by "teor".
- o Major features (security fixes, backport from 0.2.9.4-alpha):
- - Prevent a class of security bugs caused by treating the contents
- of a buffer chunk as if they were a NUL-terminated string. At
- least one such bug seems to be present in all currently used
- versions of Tor, and would allow an attacker to remotely crash
- most Tor instances, especially those compiled with extra compiler
- hardening. With this defense in place, such bugs can't crash Tor,
- though we should still fix them as they occur. Closes ticket
- 20384 (TROVE-2016-10-001).
- o Major bugfixes (parsing, security, backport from 0.2.9.8):
- - Fix a bug in parsing that could cause clients to read a single
- byte past the end of an allocated region. This bug could be used
- to cause hardened clients (built with --enable-expensive-hardening)
- to crash if they tried to visit a hostile hidden service. Non-
- hardened clients are only affected depending on the details of
- their platform's memory allocator. Fixes bug 21018; bugfix on
- 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
- 2016-12-002 and as CVE-2016-1254.
- o Major bugfixes (security, correctness, backport from 0.2.7.4-rc):
- - Fix an error that could cause us to read 4 bytes before the
- beginning of an openssl string. This bug could be used to cause
- Tor to crash on systems with unusual malloc implementations, or
- systems with unusual hardening installed. Fixes bug 17404; bugfix
- on 0.2.3.6-alpha.
- o Major bugfixes (security, pointers, backport from 0.2.8.2-alpha):
- - Avoid a difficult-to-trigger heap corruption attack when extending
- a smartlist to contain over 16GB of pointers. Fixes bug 18162;
- bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
- Reported by Guido Vranken.
- o Major bugfixes (dns proxy mode, crash, backport from 0.2.8.2-alpha):
- - Avoid crashing when running as a DNS proxy. Fixes bug 16248;
- bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
- o Major bugfixes (guard selection, backport from 0.2.7.6):
- - Actually look at the Guard flag when selecting a new directory
- guard. When we implemented the directory guard design, we
- accidentally started treating all relays as if they have the Guard
- flag during guard selection, leading to weaker anonymity and worse
- performance. Fixes bug 17772; bugfix on 0.2.4.8-alpha. Discovered
- by Mohsen Imani.
- o Major bugfixes (key management, backport from 0.2.8.3-alpha):
- - If OpenSSL fails to generate an RSA key, do not retain a dangling
- pointer to the previous (uninitialized) key value. The impact here
- should be limited to a difficult-to-trigger crash, if OpenSSL is
- running an engine that makes key generation failures possible, or
- if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
- 0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
- Baishakhi Ray.
- o Major bugfixes (parsing, backported from 0.3.0.4-rc):
- - Fix an integer underflow bug when comparing malformed Tor
- versions. This bug could crash Tor when built with
- --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
- 0.2.9.8, which were built with -ftrapv by default. In other cases
- it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
- on 0.0.8pre1. Found by OSS-Fuzz.
- o Minor features (security, memory erasure, backport from 0.2.8.1-alpha):
- - Make memwipe() do nothing when passed a NULL pointer or buffer of
- zero size. Check size argument to memwipe() for underflow. Fixes
- bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
- patch by "teor".
- o Minor features (bug-resistance, backport from 0.2.8.2-alpha):
- - Make Tor survive errors involving connections without a
- corresponding event object. Previously we'd fail with an
- assertion; now we produce a log message. Related to bug 16248.
- o Minor features (DoS-resistance, backport from 0.2.7.1-alpha):
- - Make it harder for attackers to overload hidden services with
- introductions, by blocking multiple introduction requests on the
- same circuit. Resolves ticket 15515.
- o Minor features (geoip):
- - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (compilation, backport from 0.2.7.6):
- - Fix a compilation warning with Clang 3.6: Do not check the
- presence of an address which can never be NULL. Fixes bug 17781.
- o Minor bugfixes (hidden service, backport from 0.2.7.1-alpha):
- - Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
- a client authorized hidden service. Fixes bug 15823; bugfix
- on 0.2.1.6-alpha.
- Changes in version 0.2.9.10 - 2017-03-01
- Tor 0.2.9.10 backports a security fix from later Tor release. It also
- includes fixes for some major issues affecting directory authorities,
- LibreSSL compatibility, and IPv6 correctness.
- The Tor 0.2.9.x release series is now marked as a long-term-support
- series. We intend to backport security fixes to 0.2.9.x until at
- least January of 2020.
- o Major bugfixes (directory authority, 0.3.0.3-alpha):
- - During voting, when marking a relay as a probable sybil, do not
- clear its BadExit flag: sybils can still be bad in other ways
- too. (We still clear the other flags.) Fixes bug 21108; bugfix
- on 0.2.0.13-alpha.
- o Major bugfixes (IPv6 Exits, backport from 0.3.0.3-alpha):
- - Stop rejecting all IPv6 traffic on Exits whose exit policy rejects
- any IPv6 addresses. Instead, only reject a port over IPv6 if the
- exit policy rejects that port on more than an IPv6 /16 of
- addresses. This bug was made worse by 17027 in 0.2.8.1-alpha,
- which rejected a relay's own IPv6 address by default. Fixes bug
- 21357; bugfix on commit 004f3f4e53 in 0.2.4.7-alpha.
- o Major bugfixes (parsing, also in 0.3.0.4-rc):
- - Fix an integer underflow bug when comparing malformed Tor
- versions. This bug could crash Tor when built with
- --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
- 0.2.9.8, which were built with -ftrapv by default. In other cases
- it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
- on 0.0.8pre1. Found by OSS-Fuzz.
- o Minor features (directory authorities, also in 0.3.0.4-rc):
- - Directory authorities now reject descriptors that claim to be
- malformed versions of Tor. Helps prevent exploitation of
- bug 21278.
- - Reject version numbers with components that exceed INT32_MAX.
- Otherwise 32-bit and 64-bit platforms would behave inconsistently.
- Fixes bug 21450; bugfix on 0.0.8pre1.
- o Minor features (geoip):
- - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
- Country database.
- o Minor features (portability, compilation, backport from 0.3.0.3-alpha):
- - Autoconf now checks to determine if OpenSSL structures are opaque,
- instead of explicitly checking for OpenSSL version numbers. Part
- of ticket 21359.
- - Support building with recent LibreSSL code that uses opaque
- structures. Closes ticket 21359.
- o Minor bugfixes (code correctness, also in 0.3.0.4-rc):
- - Repair a couple of (unreachable or harmless) cases of the risky
- comparison-by-subtraction pattern that caused bug 21278.
- o Minor bugfixes (tor-resolve, backport from 0.3.0.3-alpha):
- - The tor-resolve command line tool now rejects hostnames over 255
- characters in length. Previously, it would silently truncate them,
- which could lead to bugs. Fixes bug 21280; bugfix on 0.0.9pre5.
- Patch by "junglefowl".
- Changes in version 0.2.9.9 - 2017-01-23
- Tor 0.2.9.9 fixes a denial-of-service bug where an attacker could
- cause relays and clients to crash, even if they were not built with
- the --enable-expensive-hardening option. This bug affects all 0.2.9.x
- versions, and also affects 0.3.0.1-alpha: all relays running an affected
- version should upgrade.
- This release also resolves a client-side onion service reachability
- bug, and resolves a pair of small portability issues.
- o Major bugfixes (security):
- - Downgrade the "-ftrapv" option from "always on" to "only on when
- --enable-expensive-hardening is provided." This hardening option,
- like others, can turn survivable bugs into crashes -- and having
- it on by default made a (relatively harmless) integer overflow bug
- into a denial-of-service bug. Fixes bug 21278 (TROVE-2017-001);
- bugfix on 0.2.9.1-alpha.
- o Major bugfixes (client, onion service):
- - Fix a client-side onion service reachability bug, where multiple
- socks requests to an onion service (or a single slow request)
- could cause us to mistakenly mark some of the service's
- introduction points as failed, and we cache that failure so
- eventually we run out and can't reach the service. Also resolves a
- mysterious "Remote server sent bogus reason code 65021" log
- warning. The bug was introduced in ticket 17218, where we tried to
- remember the circuit end reason as a uint16_t, which mangled
- negative values. Partially fixes bug 21056 and fixes bug 20307;
- bugfix on 0.2.8.1-alpha.
- o Minor features (geoip):
- - Update geoip and geoip6 to the January 4 2017 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (portability):
- - Avoid crashing when Tor is built using headers that contain
- CLOCK_MONOTONIC_COARSE, but then tries to run on an older kernel
- without CLOCK_MONOTONIC_COARSE. Fixes bug 21035; bugfix
- on 0.2.9.1-alpha.
- - Fix Libevent detection on platforms without Libevent 1 headers
- installed. Fixes bug 21051; bugfix on 0.2.9.1-alpha.
- Changes in version 0.2.8.12 - 2016-12-19
- Tor 0.2.8.12 backports a fix for a medium-severity issue (bug 21018
- below) where Tor clients could crash when attempting to visit a
- hostile hidden service. Clients are recommended to upgrade as packages
- become available for their systems.
- It also includes an updated list of fallback directories, backported
- from 0.2.9.
- Now that the Tor 0.2.9 series is stable, only major bugfixes will be
- backported to 0.2.8 in the future.
- o Major bugfixes (parsing, security, backported from 0.2.9.8):
- - Fix a bug in parsing that could cause clients to read a single
- byte past the end of an allocated region. This bug could be used
- to cause hardened clients (built with --enable-expensive-hardening)
- to crash if they tried to visit a hostile hidden service. Non-
- hardened clients are only affected depending on the details of
- their platform's memory allocator. Fixes bug 21018; bugfix on
- 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
- 2016-12-002 and as CVE-2016-1254.
- o Minor features (fallback directory list, backported from 0.2.9.8):
- - Replace the 81 remaining fallbacks of the 100 originally
- introduced in Tor 0.2.8.3-alpha in March 2016, with a list of 177
- fallbacks (123 new, 54 existing, 27 removed) generated in December
- 2016. Resolves ticket 20170.
- o Minor features (geoip, backported from 0.2.9.7-rc):
- - Update geoip and geoip6 to the December 7 2016 Maxmind GeoLite2
- Country database.
- Changes in version 0.2.9.8 - 2016-12-19
- Tor 0.2.9.8 is the first stable release of the Tor 0.2.9 series.
- The Tor 0.2.9 series makes mandatory a number of security features
- that were formerly optional. It includes support for a new shared-
- randomness protocol that will form the basis for next generation
- hidden services, includes a single-hop hidden service mode for
- optimizing .onion services that don't actually want to be hidden,
- tries harder not to overload the directory authorities with excessive
- downloads, and supports a better protocol versioning scheme for
- improved compatibility with other implementations of the Tor protocol.
- And of course, there are numerous other bugfixes and improvements.
- This release also includes a fix for a medium-severity issue (bug
- 21018 below) where Tor clients could crash when attempting to visit a
- hostile hidden service. Clients are recommended to upgrade as packages
- become available for their systems.
- Below are listed the changes since Tor 0.2.8.11. For a list of
- changes since 0.2.9.7-rc, see the ChangeLog file.
- o New system requirements:
- - When building with OpenSSL, Tor now requires version 1.0.1 or
- later. OpenSSL 1.0.0 and earlier are no longer supported by the
- OpenSSL team, and should not be used. Closes ticket 20303.
- - Tor now requires Libevent version 2.0.10-stable or later. Older
- versions of Libevent have less efficient backends for several
- platforms, and lack the DNS code that we use for our server-side
- DNS support. This implements ticket 19554.
- - Tor now requires zlib version 1.2 or later, for security,
- efficiency, and (eventually) gzip support. (Back when we started,
- zlib 1.1 and zlib 1.0 were still found in the wild. 1.2 was
- released in 2003. We recommend the latest version.)
- o Deprecated features:
- - A number of DNS-cache-related sub-options for client ports are now
- deprecated for security reasons, and may be removed in a future
- version of Tor. (We believe that client-side DNS caching is a bad
- idea for anonymity, and you should not turn it on.) The options
- are: CacheDNS, CacheIPv4DNS, CacheIPv6DNS, UseDNSCache,
- UseIPv4Cache, and UseIPv6Cache.
- - A number of options are deprecated for security reasons, and may
- be removed in a future version of Tor. The options are:
- AllowDotExit, AllowInvalidNodes, AllowSingleHopCircuits,
- AllowSingleHopExits, ClientDNSRejectInternalAddresses,
- CloseHSClientCircuitsImmediatelyOnTimeout,
- CloseHSServiceRendCircuitsImmediatelyOnTimeout,
- ExcludeSingleHopRelays, FastFirstHopPK, TLSECGroup,
- UseNTorHandshake, and WarnUnsafeSocks.
- - The *ListenAddress options are now deprecated as unnecessary: the
- corresponding *Port options should be used instead. These options
- may someday be removed. The affected options are:
- ControlListenAddress, DNSListenAddress, DirListenAddress,
- NATDListenAddress, ORListenAddress, SocksListenAddress,
- and TransListenAddress.
- o Major bugfixes (parsing, security, new since 0.2.9.7-rc):
- - Fix a bug in parsing that could cause clients to read a single
- byte past the end of an allocated region. This bug could be used
- to cause hardened clients (built with --enable-expensive-hardening)
- to crash if they tried to visit a hostile hidden service. Non-
- hardened clients are only affected depending on the details of
- their platform's memory allocator. Fixes bug 21018; bugfix on
- 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
- 2016-12-002 and as CVE-2016-1254.
- o Major features (build, hardening):
- - Tor now builds with -ftrapv by default on compilers that support
- it. This option detects signed integer overflow (which C forbids),
- and turns it into a hard-failure. We do not apply this option to
- code that needs to run in constant time to avoid side-channels;
- instead, we use -fwrapv in that code. Closes ticket 17983.
- - When --enable-expensive-hardening is selected, stop applying the
- clang/gcc sanitizers to code that needs to run in constant time.
- Although we are aware of no introduced side-channels, we are not
- able to prove that there are none. Related to ticket 17983.
- o Major features (circuit building, security):
- - Authorities, relays, and clients now require ntor keys in all
- descriptors, for all hops (except for rare hidden service protocol
- cases), for all circuits, and for all other roles. Part of
- ticket 19163.
- - Authorities, relays, and clients only use ntor, except for
- rare cases in the hidden service protocol. Part of ticket 19163.
- o Major features (compilation):
- - Our big list of extra GCC warnings is now enabled by default when
- building with GCC (or with anything like Clang that claims to be
- GCC-compatible). To make all warnings into fatal compilation
- errors, pass --enable-fatal-warnings to configure. Closes
- ticket 19044.
- - Use the Autoconf macro AC_USE_SYSTEM_EXTENSIONS to automatically
- turn on C and POSIX extensions. (Previously, we attempted to do
- this on an ad hoc basis.) Closes ticket 19139.
- o Major features (directory authorities, hidden services):
- - Directory authorities can now perform the shared randomness
- protocol specified by proposal 250. Using this protocol, directory
- authorities generate a global fresh random value every day. In the
- future, this value will be used by hidden services to select
- HSDirs. This release implements the directory authority feature;
- the hidden service side will be implemented in the future as part
- of proposal 224. Resolves ticket 16943; implements proposal 250.
- o Major features (downloading, random exponential backoff):
- - When we fail to download an object from a directory service, wait
- for an (exponentially increasing) randomized amount of time before
- retrying, rather than a fixed interval as we did before. This
- prevents a group of Tor instances from becoming too synchronized,
- or a single Tor instance from becoming too predictable, in its
- download schedule. Closes ticket 15942.
- o Major features (resource management):
- - Tor can now notice it is about to run out of sockets, and
- preemptively close connections of lower priority. (This feature is
- off by default for now, since the current prioritizing method is
- yet not mature enough. You can enable it by setting
- "DisableOOSCheck 0", but watch out: it might close some sockets
- you would rather have it keep.) Closes ticket 18640.
- o Major features (single-hop "hidden" services):
- - Add experimental HiddenServiceSingleHopMode and
- HiddenServiceNonAnonymousMode options. When both are set to 1,
- every hidden service on that Tor instance becomes a non-anonymous
- Single Onion Service. Single Onions make one-hop (direct)
- connections to their introduction and rendezvous points. One-hop
- circuits make Single Onion servers easily locatable, but clients
- remain location-anonymous. This is compatible with the existing
- hidden service implementation, and works on the current Tor
- network without any changes to older relays or clients. Implements
- proposal 260, completes ticket 17178. Patch by teor and asn.
- o Major features (subprotocol versions):
- - Tor directory authorities now vote on a set of recommended
- "subprotocol versions", and on a set of required subprotocol
- versions. Clients and relays that lack support for a _required_
- subprotocol version will not start; those that lack support for a
- _recommended_ subprotocol version will warn the user to upgrade.
- This change allows compatible implementations of the Tor protocol(s)
- to exist without pretending to be 100% bug-compatible with
- particular releases of Tor itself. Closes ticket 19958; implements
- part of proposal 264.
- o Major bugfixes (circuit building):
- - Hidden service client-to-intro-point and service-to-rendezvous-
- point circuits use the TAP key supplied by the protocol, to avoid
- epistemic attacks. Fixes bug 19163; bugfix on 0.2.4.18-rc.
- o Major bugfixes (download scheduling):
- - Avoid resetting download status for consensuses hourly, since we
- already have another, smarter retry mechanism. Fixes bug 8625;
- bugfix on 0.2.0.9-alpha.
- - If a consensus expires while we are waiting for certificates to
- download, stop waiting for certificates.
- - If we stop waiting for certificates less than a minute after we
- started downloading them, do not consider the certificate download
- failure a separate failure. Fixes bug 20533; bugfix
- on 0.2.0.9-alpha.
- - When using exponential backoff in test networks, use a lower
- exponent, so the delays do not vary as much. This helps test
- networks bootstrap consistently. Fixes bug 20597; bugfix on 20499.
- o Major bugfixes (exit policies):
- - Avoid disclosing exit outbound bind addresses, configured port
- bind addresses, and local interface addresses in relay descriptors
- by default under ExitPolicyRejectPrivate. Instead, only reject
- these (otherwise unlisted) addresses if
- ExitPolicyRejectLocalInterfaces is set. Fixes bug 18456; bugfix on
- 0.2.7.2-alpha. Patch by teor.
- o Major bugfixes (hidden services):
- - Allow Tor clients with appropriate controllers to work with
- FetchHidServDescriptors set to 0. Previously, this option also
- disabled descriptor cache lookup, thus breaking hidden services
- entirely. Fixes bug 18704; bugfix on 0.2.0.20-rc. Patch by "twim".
- - Clients now require hidden services to include the TAP keys for
- their intro points in the hidden service descriptor. This prevents
- an inadvertent upgrade to ntor, which a malicious hidden service
- could use to distinguish clients by consensus version. Fixes bug
- 20012; bugfix on 0.2.4.8-alpha. Patch by teor.
- o Major bugfixes (relay, resolver, logging):
- - For relays that don't know their own address, avoid attempting a
- local hostname resolve for each descriptor we download. This
- will cut down on the number of "Success: chose address 'x.x.x.x'"
- log lines, and also avoid confusing clock jumps if the resolver
- is slow. Fixes bugs 20423 and 20610; bugfix on 0.2.8.1-alpha.
- o Minor features (port flags):
- - Add new flags to the *Port options to give finer control over which
- requests are allowed. The flags are NoDNSRequest, NoOnionTraffic,
- and the synthetic flag OnionTrafficOnly, which is equivalent to
- NoDNSRequest, NoIPv4Traffic, and NoIPv6Traffic. Closes enhancement
- 18693; patch by "teor".
- o Minor features (build, hardening):
- - Detect and work around a libclang_rt problem that would prevent
- clang from finding __mulodi4() on some 32-bit platforms, and thus
- keep -ftrapv from linking on those systems. Closes ticket 19079.
- - When building on a system without runtime support for the runtime
- hardening options, try to log a useful warning at configuration
- time, rather than an incomprehensible warning at link time. If
- expensive hardening was requested, this warning becomes an error.
- Closes ticket 18895.
- o Minor features (client, directory):
- - Since authorities now omit all routers that lack the Running and
- Valid flags, we assume that any relay listed in the consensus must
- have those flags. Closes ticket 20001; implements part of
- proposal 272.
- o Minor features (code safety):
- - In our integer-parsing functions, ensure that the maximum value we
- allow is no smaller than the minimum value. Closes ticket 19063;
- patch from "U+039b".
- o Minor features (compilation, portability):
- - Compile correctly on MacOS 10.12 (aka "Sierra"). Closes
- ticket 20241.
- o Minor features (config):
- - Warn users when descriptor and port addresses are inconsistent.
- Mitigates bug 13953; patch by teor.
- o Minor features (controller):
- - Allow controllers to configure basic client authorization on
- hidden services when they create them with the ADD_ONION controller
- command. Implements ticket 15588. Patch by "special".
- - Fire a STATUS_SERVER controller event whenever the hibernation
- status changes between "awake"/"soft"/"hard". Closes ticket 18685.
- - Implement new GETINFO queries for all downloads that use
- download_status_t to schedule retries. This allows controllers to
- examine the schedule for pending downloads. Closes ticket 19323.
- o Minor features (development tools, etags):
- - Teach the "make tags" Makefile target how to correctly find
- "MOCK_IMPL" function definitions. Patch from nherring; closes
- ticket 16869.
- o Minor features (directory authority):
- - After voting, if the authorities decide that a relay is not
- "Valid", they no longer include it in the consensus at all. Closes
- ticket 20002; implements part of proposal 272.
- - Directory authorities now only give the Guard flag to a relay if
- they are also giving it the Stable flag. This change allows us to
- simplify path selection for clients. It should have minimal effect
- in practice, since >99% of Guards already have the Stable flag.
- Implements ticket 18624.
- - Directory authorities now write their v3-status-votes file out to
- disk earlier in the consensus process, so we have a record of the
- votes even if we abort the consensus process. Resolves
- ticket 19036.
- o Minor features (fallback directory list, new since 0.2.9.7-rc):
- - Replace the 81 remaining fallbacks of the 100 originally
- introduced in Tor 0.2.8.3-alpha in March 2016, with a list of 177
- fallbacks (123 new, 54 existing, 27 removed) generated in December
- 2016. Resolves ticket 20170.
- o Minor features (hidden service):
- - Stop being so strict about the payload length of "rendezvous1"
- cells. We used to be locked in to the "TAP" handshake length, and
- now we can handle better handshakes like "ntor". Resolves
- ticket 18998.
- o Minor features (infrastructure, time):
- - Tor now includes an improved timer backend, so that we can
- efficiently support tens or hundreds of thousands of concurrent
- timers, as will be needed for some of our planned anti-traffic-
- analysis work. This code is based on William Ahern's "timeout.c"
- project, which implements a "tickless hierarchical timing wheel".
- Closes ticket 18365.
- - Tor now uses the operating system's monotonic timers (where
- available) for internal fine-grained timing. Previously we would
- look at the system clock, and then attempt to compensate for the
- clock running backwards. Closes ticket 18908.
- o Minor features (logging):
- - Add a set of macros to check nonfatal assertions, for internal
- use. Migrating more of our checks to these should help us avoid
- needless crash bugs. Closes ticket 18613.
- - Provide a more useful warning message when configured with an
- invalid Nickname. Closes ticket 18300; patch from "icanhasaccount".
- - When dumping unparseable router descriptors, optionally store them
- in separate files, named by digest, up to a configurable size
- limit. You can change the size limit by setting the
- MaxUnparseableDescSizeToLog option, and disable this feature by
- setting that option to 0. Closes ticket 18322.
- o Minor features (performance):
- - Change the "optimistic data" extension from "off by default" to
- "on by default". The default was ordinarily overridden by a
- consensus option, but when clients were bootstrapping for the
- first time, they would not have a consensus to get the option
- from. Changing this default saves a round-trip during startup.
- Closes ticket 18815.
- o Minor features (relay, usability):
- - When the directory authorities refuse a bad relay's descriptor,
- encourage the relay operator to contact us. Many relay operators
- won't notice this line in their logs, but it's a win if even a few
- learn why we don't like what their relay was doing. Resolves
- ticket 18760.
- o Minor features (security, TLS):
- - Servers no longer support clients that lack AES ciphersuites.
- (3DES is no longer considered an acceptable cipher.) We believe
- that no such Tor clients currently exist, since Tor has required
- OpenSSL 0.9.7 or later since 2009. Closes ticket 19998.
- o Minor features (testing):
- - Disable memory protections on OpenBSD when performing our unit
- tests for memwipe(). The test deliberately invokes undefined
- behavior, and the OpenBSD protections interfere with this. Patch
- from "rubiate". Closes ticket 20066.
- - Move the test-network.sh script to chutney, and modify tor's test-
- network.sh to call the (newer) chutney version when available.
- Resolves ticket 19116. Patch by teor.
- - Use the lcov convention for marking lines as unreachable, so that
- we don't count them when we're generating test coverage data.
- Update our coverage tools to understand this convention. Closes
- ticket 16792.
- - Our link-handshake unit tests now check that when invalid
- handshakes fail, they fail with the error messages we expected.
- - Our unit testing code that captures log messages no longer
- prevents them from being written out if the user asked for them
- (by passing --debug or --info or --notice or --warn to the "test"
- binary). This change prevents us from missing unexpected log
- messages simply because we were looking for others. Related to
- ticket 19999.
- - The unit tests now log all warning messages with the "BUG" flag.
- Previously, they only logged errors by default. This change will
- help us make our testing code more correct, and make sure that we
- only hit this code when we mean to. In the meantime, however,
- there will be more warnings in the unit test logs than before.
- This is preparatory work for ticket 19999.
- - The unit tests now treat any failure of a "tor_assert_nonfatal()"
- assertion as a test failure.
- - We've done significant work to make the unit tests run faster.
- o Minor features (testing, ipv6):
- - Add the hs-ipv6 chutney target to make test-network-all's IPv6
- tests. Remove bridges+hs, as it's somewhat redundant. This
- requires a recent chutney version that supports IPv6 clients,
- relays, and authorities. Closes ticket 20069; patch by teor.
- - Add the single-onion and single-onion-ipv6 chutney targets to
- "make test-network-all". This requires a recent chutney version
- with the single onion network flavors (git c72a652 or later).
- Closes ticket 20072; patch by teor.
- o Minor features (Tor2web):
- - Make Tor2web clients respect ReachableAddresses. This feature was
- inadvertently enabled in 0.2.8.6, then removed by bugfix 19973 on
- 0.2.8.7. Implements feature 20034. Patch by teor.
- o Minor features (unix domain sockets):
- - When configuring a unix domain socket for a SocksPort,
- ControlPort, or Hidden service, you can now wrap the address in
- quotes, using C-style escapes inside the quotes. This allows unix
- domain socket paths to contain spaces. Resolves ticket 18753.
- o Minor features (user interface):
- - Tor now supports the ability to declare options deprecated, so
- that we can recommend that people stop using them. Previously, this
- was done in an ad-hoc way. There is a new --list-deprecated-options
- command-line option to list all of the deprecated options. Closes
- ticket 19820.
- o Minor features (virtual addresses):
- - Increase the maximum number of bits for the IPv6 virtual network
- prefix from 16 to 104. In this way, the condition for address
- allocation is less restrictive. Closes ticket 20151; feature
- on 0.2.4.7-alpha.
- o Minor bug fixes (circuits):
- - Use the CircuitBuildTimeout option whenever
- LearnCircuitBuildTimeout is disabled. Previously, we would respect
- the option when a user disabled it, but not when it was disabled
- because some other option was set. Fixes bug 20073; bugfix on
- 0.2.4.12-alpha. Patch by teor.
- o Minor bugfixes (build):
- - The current Git revision when building from a local repository is
- now detected correctly when using git worktrees. Fixes bug 20492;
- bugfix on 0.2.3.9-alpha.
- o Minor bugfixes (relay address discovery):
- - Stop reordering IP addresses returned by the OS. This makes it
- more likely that Tor will guess the same relay IP address every
- time. Fixes issue 20163; bugfix on 0.2.7.1-alpha, ticket 17027.
- Reported by René Mayrhofer, patch by "cypherpunks".
- o Minor bugfixes (memory allocation):
- - Change how we allocate memory for large chunks on buffers, to
- avoid a (currently impossible) integer overflow, and to waste less
- space when allocating unusually large chunks. Fixes bug 20081;
- bugfix on 0.2.0.16-alpha. Issue identified by Guido Vranken.
- o Minor bugfixes (bootstrap):
- - Remember the directory server we fetched the consensus or previous
- certificates from, and use it to fetch future authority
- certificates. This change improves bootstrapping performance.
- Fixes bug 18963; bugfix on 0.2.8.1-alpha.
- o Minor bugfixes (circuits):
- - Make sure extend_info_from_router() is only called on servers.
- Fixes bug 19639; bugfix on 0.2.8.1-alpha.
- o Minor bugfixes (client, fascistfirewall):
- - Avoid spurious warnings when ReachableAddresses or FascistFirewall
- is set. Fixes bug 20306; bugfix on 0.2.8.2-alpha.
- o Minor bugfixes (client, unix domain sockets):
- - Disable IsolateClientAddr when using AF_UNIX backed SocksPorts as
- the client address is meaningless. Fixes bug 20261; bugfix
- on 0.2.6.3-alpha.
- o Minor bugfixes (code style):
- - Fix an integer signedness conversion issue in the case conversion
- tables. Fixes bug 19168; bugfix on 0.2.1.11-alpha.
- o Minor bugfixes (compilation):
- - Build correctly on versions of libevent2 without support for
- evutil_secure_rng_add_bytes(). Fixes bug 19904; bugfix
- on 0.2.5.4-alpha.
- - When building with Clang, use a full set of GCC warnings.
- (Previously, we included only a subset, because of the way we
- detected them.) Fixes bug 19216; bugfix on 0.2.0.1-alpha.
- - Detect Libevent2 functions correctly on systems that provide
- libevent2, but where libevent1 is linked with -levent. Fixes bug
- 19904; bugfix on 0.2.2.24-alpha. Patch from Rubiate.
- - Run correctly when built on Windows build environments that
- require _vcsprintf(). Fixes bug 20560; bugfix on 0.2.2.11-alpha.
- o Minor bugfixes (configuration):
- - When parsing quoted configuration values from the torrc file,
- handle Windows line endings correctly. Fixes bug 19167; bugfix on
- 0.2.0.16-alpha. Patch from "Pingl".
- o Minor bugfixes (directory authority):
- - Authorities now sort the "package" lines in their votes, for ease
- of debugging. (They are already sorted in consensus documents.)
- Fixes bug 18840; bugfix on 0.2.6.3-alpha.
- - Die with a more useful error when the operator forgets to place
- the authority_signing_key file into the keys directory. This
- avoids an uninformative assert & traceback about having an invalid
- key. Fixes bug 20065; bugfix on 0.2.0.1-alpha.
- - When allowing private addresses, mark Exits that only exit to
- private locations as such. Fixes bug 20064; bugfix
- on 0.2.2.9-alpha.
- - When parsing a detached signature, make sure we use the length of
- the digest algorithm instead of a hardcoded DIGEST256_LEN in
- order to avoid comparing bytes out-of-bounds with a smaller digest
- length such as SHA1. Fixes bug 19066; bugfix on 0.2.2.6-alpha.
- o Minor bugfixes (getpass):
- - Defensively fix a non-triggerable heap corruption at do_getpass()
- to protect ourselves from mistakes in the future. Fixes bug
- 19223; bugfix on 0.2.7.3-rc. Bug found by Guido Vranken, patch
- by nherring.
- o Minor bugfixes (guard selection):
- - Don't mark guards as unreachable if connection_connect() fails.
- That function fails for local reasons, so it shouldn't reveal
- anything about the status of the guard. Fixes bug 14334; bugfix
- on 0.2.3.10-alpha.
- - Use a single entry guard even if the NumEntryGuards consensus
- parameter is not provided. Fixes bug 17688; bugfix
- on 0.2.5.6-alpha.
- o Minor bugfixes (hidden services):
- - Increase the minimum number of internal circuits we preemptively
- build from 2 to 3, so a circuit is available when a client
- connects to another onion service. Fixes bug 13239; bugfix
- on 0.1.0.1-rc.
- - Allow hidden services to run on IPv6 addresses even when the
- IPv6Exit option is not set. Fixes bug 18357; bugfix
- on 0.2.4.7-alpha.
- - Stop logging intro point details to the client log on certain
- error conditions. Fixed as part of bug 20012; bugfix on
- 0.2.4.8-alpha. Patch by teor.
- - When deleting an ephemeral hidden service, close its intro points
- even if they are not completely open. Fixes bug 18604; bugfix
- on 0.2.7.1-alpha.
- - When configuring hidden services, check every hidden service
- directory's permissions. Previously, we only checked the last
- hidden service. Fixes bug 20529; bugfix on 0.2.6.2-alpha.
- o Minor bugfixes (IPv6, testing):
- - Check for IPv6 correctly on Linux when running test networks.
- Fixes bug 19905; bugfix on 0.2.7.3-rc; patch by teor.
- o Minor bugfixes (Linux seccomp2 sandbox):
- - Add permission to run the sched_yield() and sigaltstack() system
- calls, in order to support versions of Tor compiled with asan or
- ubsan code that use these calls. Now "sandbox 1" and
- "--enable-expensive-hardening" should be compatible on more
- systems. Fixes bug 20063; bugfix on 0.2.5.1-alpha.
- o Minor bugfixes (logging):
- - Downgrade a harmless log message about the
- pending_entry_connections list from "warn" to "info". Mitigates
- bug 19926.
- - Log a more accurate message when we fail to dump a microdescriptor.
- Fixes bug 17758; bugfix on 0.2.2.8-alpha. Patch from Daniel Pinto.
- - When logging a directory ownership mismatch, log the owning
- username correctly. Fixes bug 19578; bugfix on 0.2.2.29-beta.
- - When we are unable to remove the bw_accounting file, do not warn
- if the reason we couldn't remove it was that it didn't exist.
- Fixes bug 19964; bugfix on 0.2.5.4-alpha. Patch from pastly.
- o Minor bugfixes (memory leak):
- - Fix a series of slow memory leaks related to parsing torrc files
- and options. Fixes bug 19466; bugfix on 0.2.1.6-alpha.
- - Avoid a small memory leak when informing worker threads about
- rotated onion keys. Fixes bug 20401; bugfix on 0.2.6.3-alpha.
- - Fix a small memory leak when receiving AF_UNIX connections on a
- SocksPort. Fixes bug 20716; bugfix on 0.2.6.3-alpha.
- - When moving a signed descriptor object from a source to an
- existing destination, free the allocated memory inside that
- destination object. Fixes bug 20715; bugfix on 0.2.8.3-alpha.
- - Fix a memory leak and use-after-free error when removing entries
- from the sandbox's getaddrinfo() cache. Fixes bug 20710; bugfix on
- 0.2.5.5-alpha. Patch from "cypherpunks".
- - Fix a small, uncommon memory leak that could occur when reading a
- truncated ed25519 key file. Fixes bug 18956; bugfix
- on 0.2.6.1-alpha.
- o Minor bugfixes (option parsing):
- - Count unix sockets when counting client listeners (SOCKS, Trans,
- NATD, and DNS). This has no user-visible behavior changes: these
- options are set once, and never read. Required for correct
- behavior in ticket 17178. Fixes bug 19677; bugfix on
- 0.2.6.3-alpha. Patch by teor.
- o Minor bugfixes (options):
- - Check the consistency of UseEntryGuards and EntryNodes more
- reliably. Fixes bug 20074; bugfix on 0.2.4.12-alpha. Patch
- by teor.
- - Stop changing the configured value of UseEntryGuards on
- authorities and Tor2web clients. Fixes bug 20074; bugfix on
- commits 51fc6799 in 0.1.1.16-rc and acda1735 in 0.2.4.3-alpha.
- Patch by teor.
- o Minor bugfixes (relay):
- - Ensure relays don't make multiple connections during bootstrap.
- Fixes bug 20591; bugfix on 0.2.8.1-alpha.
- - Do not try to parallelize workers more than 16x without the user
- explicitly configuring us to do so, even if we do detect more than
- 16 CPU cores. Fixes bug 19968; bugfix on 0.2.3.1-alpha.
- o Minor bugfixes (testing):
- - The test-stem and test-network makefile targets now depend only on
- the tor binary that they are testing. Previously, they depended on
- "make all". Fixes bug 18240; bugfix on 0.2.8.2-alpha. Based on a
- patch from "cypherpunks".
- - Allow clients to retry HSDirs much faster in test networks. Fixes
- bug 19702; bugfix on 0.2.7.1-alpha. Patch by teor.
- - Avoid a unit test failure on systems with over 16 detectable CPU
- cores. Fixes bug 19968; bugfix on 0.2.3.1-alpha.
- - Let backtrace tests work correctly under AddressSanitizer:
- disable ASAN's detection of segmentation faults while running
- test_bt.sh, so that we can make sure that our own backtrace
- generation code works. Fixes bug 18934; bugfix
- on 0.2.5.2-alpha. Patch from "cypherpunks".
- - Fix the test-network-all target on out-of-tree builds by using the
- correct path to the test driver script. Fixes bug 19421; bugfix
- on 0.2.7.3-rc.
- - Stop spurious failures in the local interface address discovery
- unit tests. Fixes bug 20634; bugfix on 0.2.8.1-alpha; patch by
- Neel Chauhan.
- - Use ECDHE ciphers instead of ECDH in tortls tests. LibreSSL has
- removed the ECDH ciphers which caused the tests to fail on
- platforms which use it. Fixes bug 20460; bugfix on 0.2.8.1-alpha.
- - The tor_tls_server_info_callback unit test no longer crashes when
- debug-level logging is turned on. Fixes bug 20041; bugfix
- on 0.2.8.1-alpha.
- o Minor bugfixes (time):
- - Improve overflow checks in tv_udiff and tv_mdiff. Fixes bug 19483;
- bugfix on all released tor versions.
- - When computing the difference between two times in milliseconds,
- we now round to the nearest millisecond correctly. Previously, we
- could sometimes round in the wrong direction. Fixes bug 19428;
- bugfix on 0.2.2.2-alpha.
- o Minor bugfixes (Tor2web):
- - Prevent Tor2web clients from running hidden services: these services
- are not anonymous due to the one-hop client paths. Fixes bug
- 19678. Patch by teor.
- o Minor bugfixes (user interface):
- - Display a more accurate number of suppressed messages in the log
- rate-limiter. Previously, there was a potential integer overflow
- in the counter. Now, if the number of messages hits a maximum, the
- rate-limiter doesn't count any further. Fixes bug 19435; bugfix
- on 0.2.4.11-alpha.
- - Fix a typo in the passphrase prompt for the ed25519 identity key.
- Fixes bug 19503; bugfix on 0.2.7.2-alpha.
- o Code simplification and refactoring:
- - Remove redundant declarations of the MIN macro. Closes
- ticket 18889.
- - Rename tor_dup_addr() to tor_addr_to_str_dup() to avoid confusion.
- Closes ticket 18462; patch from "icanhasaccount".
- - Split the 600-line directory_handle_command_get function into
- separate functions for different URL types. Closes ticket 16698.
- o Documentation:
- - Add module-level internal documentation for 36 C files that
- previously didn't have a high-level overview. Closes ticket 20385.
- - Correct the IPv6 syntax in our documentation for the
- VirtualAddrNetworkIPv6 torrc option. Closes ticket 19743.
- - Correct the minimum bandwidth value in torrc.sample, and queue a
- corresponding change for torrc.minimal. Closes ticket 20085.
- - Fix spelling of "--enable-tor2web-mode" in the manpage. Closes
- ticket 19153. Patch from "U+039b".
- - Module-level documentation for several more modules. Closes
- tickets 19287 and 19290.
- - Document the --passphrase-fd option in the tor manpage. Fixes bug
- 19504; bugfix on 0.2.7.3-rc.
- - Document the default PathsNeededToBuildCircuits value that's used
- by clients when the directory authorities don't set
- min_paths_for_circs_pct. Fixes bug 20117; bugfix on 0.2.4.10-alpha.
- Patch by teor, reported by Jesse V.
- - Fix manual for the User option: it takes a username, not a UID.
- Fixes bug 19122; bugfix on 0.0.2pre16 (the first version to have
- a manpage!).
- - Fix the description of the --passphrase-fd option in the
- tor-gencert manpage. The option is used to pass the number of a
- file descriptor to read the passphrase from, not to read the file
- descriptor from. Fixes bug 19505; bugfix on 0.2.0.20-alpha.
- o Removed code:
- - We no longer include the (dead, deprecated) bufferevent code in
- Tor. Closes ticket 19450. Based on a patch from "U+039b".
- o Removed features:
- - Remove support for "GET /tor/bytes.txt" DirPort request, and
- "GETINFO dir-usage" controller request, which were only available
- via a compile-time option in Tor anyway. Feature was added in
- 0.2.2.1-alpha. Resolves ticket 19035.
- - There is no longer a compile-time option to disable support for
- TransPort. (If you don't want TransPort, just don't use it.) Patch
- from "U+039b". Closes ticket 19449.
- o Testing:
- - Run more workqueue tests as part of "make check". These had
- previously been implemented, but you needed to know special
- command-line options to enable them.
- - We now have unit tests for our code to reject zlib "compression
- bombs". (Fortunately, the code works fine.)
- Changes in version 0.2.8.11 - 2016-12-08
- Tor 0.2.8.11 backports fixes for additional portability issues that
- could prevent Tor from building correctly on OSX Sierra, or with
- OpenSSL 1.1. Affected users should upgrade; others can safely stay
- with 0.2.8.10.
- o Minor bugfixes (portability):
- - Avoid compilation errors when building on OSX Sierra. Sierra began
- to support the getentropy() and clock_gettime() APIs, but created
- a few problems in doing so. Tor 0.2.9 has a more thorough set of
- workarounds; in 0.2.8, we are just using the /dev/urandom and mach
- monotonic time interfaces. Fixes bug 20865. Bugfix
- on 0.2.8.1-alpha.
- o Minor bugfixes (portability, backport from 0.2.9.5-alpha):
- - Fix compilation with OpenSSL 1.1 and less commonly-used CPU
- architectures. Closes ticket 20588.
- Changes in version 0.2.8.10 - 2016-12-02
- Tor 0.2.8.10 backports a fix for a bug that would sometimes make clients
- unusable after they left standby mode. It also backports fixes for
- a few portability issues and a small but problematic memory leak.
- o Major bugfixes (client reliability, backport from 0.2.9.5-alpha):
- - When Tor leaves standby because of a new application request, open
- circuits as needed to serve that request. Previously, we would
- potentially wait a very long time. Fixes part of bug 19969; bugfix
- on 0.2.8.1-alpha.
- o Major bugfixes (client performance, backport from 0.2.9.5-alpha):
- - Clients now respond to new application stream requests immediately
- when they arrive, rather than waiting up to one second before
- starting to handle them. Fixes part of bug 19969; bugfix
- on 0.2.8.1-alpha.
- o Minor bugfixes (portability, backport from 0.2.9.6-rc):
- - Work around a bug in the OSX 10.12 SDK that would prevent us from
- successfully targeting earlier versions of OSX. Resolves
- ticket 20235.
- o Minor bugfixes (portability, backport from 0.2.9.5-alpha):
- - Fix implicit conversion warnings under OpenSSL 1.1. Fixes bug
- 20551; bugfix on 0.2.1.1-alpha.
- o Minor bugfixes (relay, backport from 0.2.9.5-alpha):
- - Work around a memory leak in OpenSSL 1.1 when encoding public
- keys. Fixes bug 20553; bugfix on 0.0.2pre8.
- o Minor features (geoip):
- - Update geoip and geoip6 to the November 3 2016 Maxmind GeoLite2
- Country database.
- Changes in version 0.2.8.9 - 2016-10-17
- Tor 0.2.8.9 backports a fix for a security hole in previous versions
- of Tor that would allow a remote attacker to crash a Tor client,
- hidden service, relay, or authority. All Tor users should upgrade to
- this version, or to 0.2.9.4-alpha. Patches will be released for older
- versions of Tor.
- o Major features (security fixes, also in 0.2.9.4-alpha):
- - Prevent a class of security bugs caused by treating the contents
- of a buffer chunk as if they were a NUL-terminated string. At
- least one such bug seems to be present in all currently used
- versions of Tor, and would allow an attacker to remotely crash
- most Tor instances, especially those compiled with extra compiler
- hardening. With this defense in place, such bugs can't crash Tor,
- though we should still fix them as they occur. Closes ticket
- 20384 (TROVE-2016-10-001).
- o Minor features (geoip):
- - Update geoip and geoip6 to the October 4 2016 Maxmind GeoLite2
- Country database.
- Changes in version 0.2.8.8 - 2016-09-23
- Tor 0.2.8.8 fixes two crash bugs present in previous versions of the
- 0.2.8.x series. Relays running 0.2.8.x should upgrade, as should users
- who select public relays as their bridges.
- o Major bugfixes (crash):
- - Fix a complicated crash bug that could affect Tor clients
- configured to use bridges when replacing a networkstatus consensus
- in which one of their bridges was mentioned. OpenBSD users saw
- more crashes here, but all platforms were potentially affected.
- Fixes bug 20103; bugfix on 0.2.8.2-alpha.
- o Major bugfixes (relay, OOM handler):
- - Fix a timing-dependent assertion failure that could occur when we
- tried to flush from a circuit after having freed its cells because
- of an out-of-memory condition. Fixes bug 20203; bugfix on
- 0.2.8.1-alpha. Thanks to "cypherpunks" for help diagnosing
- this one.
- o Minor feature (fallback directories):
- - Remove broken fallbacks from the hard-coded fallback directory
- list. Closes ticket 20190; patch by teor.
- o Minor features (geoip):
- - Update geoip and geoip6 to the September 6 2016 Maxmind GeoLite2
- Country database.
- Changes in version 0.2.8.7 - 2016-08-24
- Tor 0.2.8.7 fixes an important bug related to the ReachableAddresses
- option in 0.2.8.6, and replaces a retiring bridge authority. Everyone
- who sets the ReachableAddresses option, and all bridges, are strongly
- encouraged to upgrade.
- o Directory authority changes:
- - The "Tonga" bridge authority has been retired; the new bridge
- authority is "Bifroest". Closes tickets 19728 and 19690.
- o Major bugfixes (client, security):
- - Only use the ReachableAddresses option to restrict the first hop
- in a path. In earlier versions of 0.2.8.x, it would apply to
- every hop in the path, with a possible degradation in anonymity
- for anyone using an uncommon ReachableAddress setting. Fixes bug
- 19973; bugfix on 0.2.8.2-alpha.
- o Minor features (geoip):
- - Update geoip and geoip6 to the August 2 2016 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (compilation):
- - Remove an inappropriate "inline" in tortls.c that was causing
- warnings on older versions of GCC. Fixes bug 19903; bugfix
- on 0.2.8.1-alpha.
- o Minor bugfixes (fallback directories):
- - Avoid logging a NULL string pointer when loading fallback
- directory information. Fixes bug 19947; bugfix on 0.2.4.7-alpha
- and 0.2.8.1-alpha. Report and patch by "rubiate".
- Changes in version 0.2.8.6 - 2016-08-02
- Tor 0.2.8.6 is the first stable version of the Tor 0.2.8 series.
- The Tor 0.2.8 series improves client bootstrapping performance,
- completes the authority-side implementation of improved identity
- keys for relays, and includes numerous bugfixes and performance
- improvements throughout the program. This release continues to
- improve the coverage of Tor's test suite. For a full list of
- changes since Tor 0.2.7, see the ReleaseNotes file.
- Below is a list of the changes since Tor 0.2.7.
- o New system requirements:
- - Tor no longer attempts to support platforms where the "time_t"
- type is unsigned. (To the best of our knowledge, only OpenVMS does
- this, and Tor has never actually built on OpenVMS.) Closes
- ticket 18184.
- - Tor no longer supports versions of OpenSSL with a broken
- implementation of counter mode. (This bug was present in OpenSSL
- 1.0.0, and was fixed in OpenSSL 1.0.0a.) Tor still detects, but no
- longer runs with, these versions.
- - Tor now uses Autoconf version 2.63 or later, and Automake 1.11 or
- later (released in 2008 and 2009 respectively). If you are
- building Tor from the git repository instead of from the source
- distribution, and your tools are older than this, you will need to
- upgrade. Closes ticket 17732.
- o Directory authority changes:
- - Update the V3 identity key for the dannenberg directory authority:
- it was changed on 18 November 2015. Closes task 17906. Patch
- by teor.
- - Urras is no longer a directory authority. Closes ticket 19271.
- o Major features (directory system):
- - Include a trial list of default fallback directories, based on an
- opt-in survey of suitable relays. Doing this should make clients
- bootstrap more quickly and reliably, and reduce the load on the
- directory authorities. Closes ticket 15775. Patch by teor.
- Candidates identified using an OnionOO script by weasel, teor,
- gsathya, and karsten.
- - Previously only relays that explicitly opened a directory port
- (DirPort) accepted directory requests from clients. Now all
- relays, with and without a DirPort, accept and serve tunneled
- directory requests that they receive through their ORPort. You can
- disable this behavior using the new DirCache option. Closes
- ticket 12538.
- - When bootstrapping multiple consensus downloads at a time, use the
- first one that starts downloading, and close the rest. This
- reduces failures when authorities or fallback directories are slow
- or down. Together with the code for feature 15775, this feature
- should reduces failures due to fallback churn. Implements ticket
- 4483. Patch by teor. Implements IPv4 portions of proposal 210 by
- mikeperry and teor.
- o Major features (security, Linux):
- - When Tor starts as root on Linux and is told to switch user ID, it
- can now retain the capability to bind to low ports. By default,
- Tor will do this only when it's switching user ID and some low
- ports have been configured. You can change this behavior with the
- new option KeepBindCapabilities. Closes ticket 8195.
- o Major bugfixes (client, bootstrapping):
- - Check if bootstrap consensus downloads are still needed when the
- linked connection attaches. This prevents tor making unnecessary
- begindir-style connections, which are the only directory
- connections tor clients make since the fix for 18483 was merged.
- - Fix some edge cases where consensus download connections may not
- have been closed, even though they were not needed. Related to fix
- for 18809.
- - Make relays retry consensus downloads the correct number of times,
- rather than the more aggressive client retry count. Fixes part of
- ticket 18809.
- o Major bugfixes (dns proxy mode, crash):
- - Avoid crashing when running as a DNS proxy. Fixes bug 16248;
- bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
- o Major bugfixes (ed25519, voting):
- - Actually enable support for authorities to match routers by their
- Ed25519 identities. Previously, the code had been written, but
- some debugging code that had accidentally been left in the
- codebase made it stay turned off. Fixes bug 17702; bugfix
- on 0.2.7.2-alpha.
- - When collating votes by Ed25519 identities, authorities now
- include a "NoEdConsensus" flag if the ed25519 value (or lack
- thereof) for a server does not reflect the majority consensus.
- Related to bug 17668; bugfix on 0.2.7.2-alpha.
- - When generating a vote with keypinning disabled, never include two
- entries for the same ed25519 identity. This bug was causing
- authorities to generate votes that they could not parse when a
- router violated key pinning by changing its RSA identity but
- keeping its Ed25519 identity. Fixes bug 17668; fixes part of bug
- 18318. Bugfix on 0.2.7.2-alpha.
- o Major bugfixes (key management):
- - If OpenSSL fails to generate an RSA key, do not retain a dangling
- pointer to the previous (uninitialized) key value. The impact here
- should be limited to a difficult-to-trigger crash, if OpenSSL is
- running an engine that makes key generation failures possible, or
- if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
- 0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
- Baishakhi Ray.
- o Major bugfixes (security, client, DNS proxy):
- - Stop a crash that could occur when a client running with DNSPort
- received a query with multiple address types, and the first
- address type was not supported. Found and fixed by Scott Dial.
- Fixes bug 18710; bugfix on 0.2.5.4-alpha.
- o Major bugfixes (security, compilation):
- - Correctly detect compiler flags on systems where _FORTIFY_SOURCE
- is predefined. Previously, our use of -D_FORTIFY_SOURCE would
- cause a compiler warning, thereby making other checks fail, and
- needlessly disabling compiler-hardening support. Fixes one case of
- bug 18841; bugfix on 0.2.3.17-beta. Patch from "trudokal".
- - Repair hardened builds under the clang compiler. Previously, our
- use of _FORTIFY_SOURCE would conflict with clang's address
- sanitizer. Fixes bug 14821; bugfix on 0.2.5.4-alpha.
- o Major bugfixes (security, pointers):
- - Avoid a difficult-to-trigger heap corruption attack when extending
- a smartlist to contain over 16GB of pointers. Fixes bug 18162;
- bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
- Reported by Guido Vranken.
- o Major bugfixes (testing):
- - Fix a bug that would block 'make test-network-all' on systems where
- IPv6 packets were lost. Fixes bug 19008; bugfix on 0.2.7.3-rc.
- o Major bugfixes (user interface):
- - Correctly give a warning in the cases where a relay is specified
- by nickname, and one such relay is found, but it is not officially
- Named. Fixes bug 19203; bugfix on 0.2.3.1-alpha.
- o Minor features (accounting):
- - Added two modes to the AccountingRule option: One for limiting
- only the number of bytes sent ("AccountingRule out"), and one for
- limiting only the number of bytes received ("AccountingRule in").
- Closes ticket 15989; patch from "unixninja92".
- o Minor features (bug-resistance):
- - Make Tor survive errors involving connections without a
- corresponding event object. Previously we'd fail with an
- assertion; now we produce a log message. Related to bug 16248.
- - Use tor_snprintf() and tor_vsnprintf() even in external and low-
- level code, to harden against accidental failures to NUL-
- terminate. Part of ticket 17852. Patch from jsturgix. Found
- with Flawfinder.
- o Minor features (build):
- - Detect systems with FreeBSD-derived kernels (such as GNU/kFreeBSD)
- as having possible IPFW support. Closes ticket 18448. Patch from
- Steven Chamberlain.
- - Since our build process now uses "make distcheck", we no longer
- force "make dist" to depend on "make check". Closes ticket 17893;
- patch from "cypherpunks".
- - Tor now builds once again with the recent OpenSSL 1.1 development
- branch (tested against 1.1.0-pre5 and 1.1.0-pre6-dev). We have been
- tracking OpenSSL 1.1 development as it has progressed, and fixing
- numerous compatibility issues as they arose. See tickets
- 17549, 17921, 17984, 19499, and 18286.
- - When building manual pages, set the timezone to "UTC", so that the
- output is reproducible. Fixes bug 19558; bugfix on 0.2.2.9-alpha.
- Patch from intrigeri.
- o Minor features (clients):
- - Make clients, onion services, and bridge relays always use an
- encrypted begindir connection for directory requests. Resolves
- ticket 18483. Patch by teor.
- o Minor features (controller):
- - Add 'GETINFO exit-policy/reject-private/[default,relay]', so
- controllers can examine the the reject rules added by
- ExitPolicyRejectPrivate. This makes it easier for stem to display
- exit policies.
- - Adds the FallbackDir entries to 'GETINFO config/defaults'. Closes
- tickets 16774 and 17817. Patch by George Tankersley.
- - New 'GETINFO hs/service/desc/id/' command to retrieve a hidden
- service descriptor from a service's local hidden service
- descriptor cache. Closes ticket 14846.
- o Minor features (crypto):
- - Add SHA3 and SHAKE support to crypto.c. Closes ticket 17783.
- - Add SHA512 support to crypto.c. Closes ticket 17663; patch from
- George Tankersley.
- - Improve performance when hashing non-multiple of 8 sized buffers,
- based on Andrew Moon's public domain SipHash-2-4 implementation.
- Fixes bug 17544; bugfix on 0.2.5.3-alpha.
- - Validate the hard-coded Diffie-Hellman parameters and ensure that
- p is a safe prime, and g is a suitable generator. Closes
- ticket 18221.
- - When allocating a digest state object, allocate no more space than
- we actually need. Previously, we would allocate as much space as
- the state for the largest algorithm would need. This change saves
- up to 672 bytes per circuit. Closes ticket 17796.
- o Minor features (directory downloads):
- - Add UseDefaultFallbackDirs, which enables any hard-coded fallback
- directory mirrors. The default is 1; set it to 0 to disable
- fallbacks. Implements ticket 17576. Patch by teor.
- - Wait for busy authorities and fallback directories to become non-
- busy when bootstrapping. (A similar change was made in 6c443e987d
- for directory caches chosen from the consensus.) Closes ticket
- 17864; patch by teor.
- o Minor features (geoip):
- - Update geoip and geoip6 to the July 6 2016 Maxmind GeoLite2
- Country database.
- o Minor features (hidden service directory):
- - Streamline relay-side hsdir handling: when relays consider whether
- to accept an uploaded hidden service descriptor, they no longer
- check whether they are one of the relays in the network that is
- "supposed" to handle that descriptor. Implements ticket 18332.
- o Minor features (IPv6):
- - Add ClientPreferIPv6DirPort, which is set to 0 by default. If set
- to 1, tor prefers IPv6 directory addresses.
- - Add ClientUseIPv4, which is set to 1 by default. If set to 0, tor
- avoids using IPv4 for client OR and directory connections.
- - Add address policy assume_action support for IPv6 addresses.
- - Add an argument 'ipv6=address:orport' to the DirAuthority and
- FallbackDir torrc options, to specify an IPv6 address for an
- authority or fallback directory. Add hard-coded ipv6 addresses for
- directory authorities that have them. Closes ticket 17327; patch
- from Nick Mathewson and teor.
- - Allow users to configure directory authorities and fallback
- directory servers with IPv6 addresses and ORPorts. Resolves
- ticket 6027.
- - Limit IPv6 mask bits to 128.
- - Make tor_ersatz_socketpair work on IPv6-only systems. Fixes bug
- 17638; bugfix on 0.0.2pre8. Patch by teor.
- - Try harder to obey the IP version restrictions "ClientUseIPv4 0",
- "ClientUseIPv6 0", "ClientPreferIPv6ORPort", and
- "ClientPreferIPv6DirPort". Closes ticket 17840; patch by teor.
- - Warn when comparing against an AF_UNSPEC address in a policy, it's
- almost always a bug. Closes ticket 17863; patch by teor.
- - routerset_parse now accepts IPv6 literal addresses. Fixes bug
- 17060; bugfix on 0.2.1.3-alpha. Patch by teor.
- o Minor features (Linux seccomp2 sandbox):
- - Reject attempts to change our Address with "Sandbox 1" enabled.
- Changing Address with Sandbox turned on would never actually work,
- but previously it would fail in strange and confusing ways. Found
- while fixing 18548.
- o Minor features (logging):
- - When logging to syslog, allow a tag to be added to the syslog
- identity (the string prepended to every log message). The tag can
- be configured with SyslogIdentityTag and defaults to none. Setting
- it to "foo" will cause logs to be tagged as "Tor-foo". Closes
- ticket 17194.
- o Minor features (portability):
- - Use timingsafe_memcmp() where available. Closes ticket 17944;
- patch from <logan@hackers.mu>.
- o Minor features (relay, address discovery):
- - Add a family argument to get_interface_addresses_raw() and
- subfunctions to make network interface address interogation more
- efficient. Now Tor can specifically ask for IPv4, IPv6 or both
- types of interfaces from the operating system. Resolves
- ticket 17950.
- - When get_interface_address6_list(.,AF_UNSPEC,.) is called and
- fails to enumerate interface addresses using the platform-specific
- API, have it rely on the UDP socket fallback technique to try and
- find out what IP addresses (both IPv4 and IPv6) our machine has.
- Resolves ticket 17951.
- o Minor features (replay cache):
- - The replay cache now uses SHA256 instead of SHA1. Implements
- feature 8961. Patch by teor, issue reported by rransom.
- o Minor features (robustness):
- - Exit immediately with an error message if the code attempts to use
- Libevent without having initialized it. This should resolve some
- frequently-made mistakes in our unit tests. Closes ticket 18241.
- o Minor features (security, clock):
- - Warn when the system clock appears to move back in time (when the
- state file was last written in the future). Tor doesn't know that
- consensuses have expired if the clock is in the past. Patch by
- teor. Implements ticket 17188.
- o Minor features (security, exit policies):
- - ExitPolicyRejectPrivate now rejects more private addresses by
- default. Specifically, it now rejects the relay's outbound bind
- addresses (if configured), and the relay's configured port
- addresses (such as ORPort and DirPort). Fixes bug 17027; bugfix on
- 0.2.0.11-alpha. Patch by teor.
- o Minor features (security, memory erasure):
- - Make memwipe() do nothing when passed a NULL pointer or buffer of
- zero size. Check size argument to memwipe() for underflow. Fixes
- bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
- patch by teor.
- - Set the unused entries in a smartlist to NULL. This helped catch
- a (harmless) bug, and shouldn't affect performance too much.
- Implements ticket 17026.
- - Use SecureMemoryWipe() function to securely clean memory on
- Windows. Previously we'd use OpenSSL's OPENSSL_cleanse() function.
- Implements feature 17986.
- - Use explicit_bzero or memset_s when present. Previously, we'd use
- OpenSSL's OPENSSL_cleanse() function. Closes ticket 7419; patches
- from <logan@hackers.mu> and <selven@hackers.mu>.
- o Minor features (security, RNG):
- - Adjust Tor's use of OpenSSL's RNG APIs so that they absolutely,
- positively are not allowed to fail. Previously we depended on
- internal details of OpenSSL's behavior. Closes ticket 17686.
- - Never use the system entropy output directly for anything besides
- seeding the PRNG. When we want to generate important keys, instead
- of using system entropy directly, we now hash it with the PRNG
- stream. This may help resist certain attacks based on broken OS
- entropy implementations. Closes part of ticket 17694.
- - Use modern system calls (like getentropy() or getrandom()) to
- generate strong entropy on platforms that have them. Closes
- ticket 13696.
- o Minor features (security, win32):
- - Set SO_EXCLUSIVEADDRUSE on Win32 to avoid a local port-stealing
- attack. Fixes bug 18123; bugfix on all tor versions. Patch
- by teor.
- o Minor features (unix domain sockets):
- - Add a new per-socket option, RelaxDirModeCheck, to allow creating
- Unix domain sockets without checking the permissions on the parent
- directory. (Tor checks permissions by default because some
- operating systems only check permissions on the parent directory.
- However, some operating systems do look at permissions on the
- socket, and tor's default check is unneeded.) Closes ticket 18458.
- Patch by weasel.
- o Minor features (unix file permissions):
- - Defer creation of Unix sockets until after setuid. This avoids
- needing CAP_CHOWN and CAP_FOWNER when using systemd's
- CapabilityBoundingSet, or chown and fowner when using SELinux.
- Implements part of ticket 17562. Patch from Jamie Nguyen.
- - If any directory created by Tor is marked as group readable, the
- filesystem group is allowed to be either the default GID or the
- root user. Allowing root to read the DataDirectory prevents the
- need for CAP_READ_SEARCH when using systemd's
- CapabilityBoundingSet, or dac_read_search when using SELinux.
- Implements part of ticket 17562. Patch from Jamie Nguyen.
- - Introduce a new DataDirectoryGroupReadable option. If it is set to
- 1, the DataDirectory will be made readable by the default GID.
- Implements part of ticket 17562. Patch from Jamie Nguyen.
- o Minor bugfixes (accounting):
- - The max bandwidth when using 'AccountRule sum' is now correctly
- logged. Fixes bug 18024; bugfix on 0.2.6.1-alpha. Patch
- from "unixninja92".
- o Minor bugfixes (assert, portability):
- - Fix an assertion failure in memarea.c on systems where "long" is
- shorter than the size of a pointer. Fixes bug 18716; bugfix
- on 0.2.1.1-alpha.
- o Minor bugfixes (bootstrap):
- - Consistently use the consensus download schedule for authority
- certificates. Fixes bug 18816; bugfix on 0.2.4.13-alpha.
- o Minor bugfixes (build):
- - Avoid spurious failures from configure files related to calling
- exit(0) in TOR_SEARCH_LIBRARY. Fixes bug 18626; bugfix on
- 0.2.0.1-alpha. Patch from "cypherpunks".
- - Do not link the unit tests against both the testing and non-
- testing versions of the static libraries. Fixes bug 18490; bugfix
- on 0.2.7.1-alpha.
- - Resolve warnings when building on systems that are concerned with
- signed char. Fixes bug 18728; bugfix on 0.2.7.2-alpha
- and 0.2.6.1-alpha.
- - Silence spurious clang-scan warnings in the ed25519_donna code by
- explicitly initializing some objects. Fixes bug 18384; bugfix on
- 0.2.7.2-alpha. Patch by teor.
- - When libscrypt.h is found, but no libscrypt library can be linked,
- treat libscrypt as absent. Fixes bug 19161; bugfix
- on 0.2.6.1-alpha.
- - Cause the unit tests to compile correctly on mingw64 versions that
- lack sscanf. Fixes bug 19213; bugfix on 0.2.7.1-alpha.
- - Don't try to use the pthread_condattr_setclock() function unless
- it actually exists. Fixes compilation on NetBSD-6.x. Fixes bug
- 17819; bugfix on 0.2.6.3-alpha.
- - Fix backtrace compilation on FreeBSD. Fixes bug 17827; bugfix
- on 0.2.5.2-alpha.
- - Fix search for libevent libraries on OpenBSD (and other systems
- that install libevent 1 and libevent 2 in parallel). Fixes bug
- 16651; bugfix on 0.1.0.7-rc. Patch from "rubiate".
- - Isolate environment variables meant for tests from the rest of the
- build system. Fixes bug 17818; bugfix on 0.2.7.3-rc.
- - Mark all object files that include micro-revision.i as depending
- on it, so as to make parallel builds more reliable. Fixes bug
- 17826; bugfix on 0.2.5.1-alpha.
- - Remove config.log only from make distclean, not from make clean.
- Fixes bug 17924; bugfix on 0.2.4.1-alpha.
- - Replace usage of 'INLINE' with 'inline'. Fixes bug 17804; bugfix
- on 0.0.2pre8.
- - Remove an #endif from configure.ac so that we correctly detect the
- presence of in6_addr.s6_addr32. Fixes bug 17923; bugfix
- on 0.2.0.13-alpha.
- o Minor bugfixes (client, bootstrap):
- - Count receipt of new microdescriptors as progress towards
- bootstrapping. Previously, with EntryNodes set, Tor might not
- successfully repopulate the guard set on bootstrapping. Fixes bug
- 16825; bugfix on 0.2.3.1-alpha.
- o Minor bugfixes (code correctness):
- - Fix a bad memory handling bug that would occur if we had queued a
- cell on a channel's incoming queue. Fortunately, we can't actually
- queue a cell like that as our code is constructed today, but it's
- best to avoid this kind of error, even if there isn't any code
- that triggers it today. Fixes bug 18570; bugfix on 0.2.4.4-alpha.
- - Assert that allocated memory held by the reputation code is freed
- according to its internal counters. Fixes bug 17753; bugfix
- on 0.1.1.1-alpha.
- - Assert when the TLS contexts fail to initialize. Fixes bug 17683;
- bugfix on 0.0.6.
- - Update to the latest version of Trunnel, which tries harder to
- avoid generating code that can invoke memcpy(p,NULL,0). Bug found
- by clang address sanitizer. Fixes bug 18373; bugfix
- on 0.2.7.2-alpha.
- - When closing an entry connection, generate a warning if we should
- have sent an end cell for it but we haven't. Fixes bug 17876;
- bugfix on 0.2.3.2-alpha.
- o Minor bugfixes (configuration):
- - Fix a tiny memory leak when parsing a port configuration ending in
- ":auto". Fixes bug 18374; bugfix on 0.2.3.3-alpha.
- o Minor bugfixes (containers):
- - If we somehow attempt to construct a heap with more than
- 1073741822 elements, avoid an integer overflow when maintaining
- the heap property. Fixes bug 18296; bugfix on 0.1.2.1-alpha.
- o Minor bugfixes (controller, microdescriptors):
- - Make GETINFO dir/status-vote/current/consensus conform to the
- control specification by returning "551 Could not open cached
- consensus..." when not caching consensuses. Fixes bug 18920;
- bugfix on 0.2.2.6-alpha.
- o Minor bugfixes (crypto):
- - Check the return value of HMAC() and assert on failure. Fixes bug
- 17658; bugfix on 0.2.3.6-alpha. Patch by teor.
- o Minor bugfixes (directories):
- - When fetching extrainfo documents, compare their SHA256 digests
- and Ed25519 signing key certificates with the routerinfo that led
- us to fetch them, rather than with the most recent routerinfo.
- Otherwise we generate many spurious warnings about mismatches.
- Fixes bug 17150; bugfix on 0.2.7.2-alpha.
- - When generating a URL for a directory server on an IPv6 address,
- wrap the IPv6 address in square brackets. Fixes bug 18051; bugfix
- on 0.2.3.9-alpha. Patch from Malek.
- o Minor bugfixes (downloading):
- - Predict more correctly whether we'll be downloading over HTTP when
- we determine the maximum length of a URL. This should avoid a
- "BUG" warning about the Squid HTTP proxy and its URL limits. Fixes
- bug 19191.
- o Minor bugfixes (exit policies, security):
- - Refresh an exit relay's exit policy when interface addresses
- change. Previously, tor only refreshed the exit policy when the
- configured external address changed. Fixes bug 18208; bugfix on
- 0.2.7.3-rc. Patch by teor.
- o Minor bugfixes (fallback directories):
- - Mark fallbacks as "too busy" when they return a 503 response,
- rather than just marking authorities. Fixes bug 17572; bugfix on
- 0.2.4.7-alpha. Patch by teor.
- - When requesting extrainfo descriptors from a trusted directory
- server, check whether it is an authority or a fallback directory
- which supports extrainfo descriptors. Fixes bug 18489; bugfix on
- 0.2.4.7-alpha. Reported by atagar, patch by teor.
- o Minor bugfixes (hidden service, client):
- - Handle the case where the user makes several fast consecutive
- requests to the same .onion address. Previously, the first six
- requests would each trigger a descriptor fetch, each picking a
- directory (there are 6 overall) and the seventh one would fail
- because no directories were left, thereby triggering a close on
- all current directory connections asking for the hidden service.
- The solution here is to not close the connections if we have
- pending directory fetches. Fixes bug 15937; bugfix
- on 0.2.7.1-alpha.
- o Minor bugfixes (hidden service, control port):
- - Add the onion address to the HS_DESC event for the UPLOADED action
- both on success or failure. It was previously hardcoded with
- UNKNOWN. Fixes bug 16023; bugfix on 0.2.7.2-alpha.
- o Minor bugfixes (hidden service, directory):
- - Bridges now refuse "rendezvous2" (hidden service descriptor)
- publish attempts. Suggested by ticket 18332.
- o Minor bugfixes (IPv6):
- - Update the limits in max_dl_per_request for IPv6 address length.
- Fixes bug 17573; bugfix on 0.2.1.5-alpha.
- o Minor bugfixes (Linux seccomp2 sandbox):
- - Allow more syscalls when running with "Sandbox 1" enabled:
- sysinfo, getsockopt(SO_SNDBUF), and setsockopt(SO_SNDBUFFORCE). On
- some systems, these are required for Tor to start. Fixes bug
- 18397; bugfix on 0.2.5.1-alpha. Patch from Daniel Pinto.
- - Allow IPPROTO_UDP datagram sockets when running with "Sandbox 1",
- so that get_interface_address6_via_udp_socket_hack() can work.
- Fixes bug 19660; bugfix on 0.2.5.1-alpha.
- - Allow the setrlimit syscall, and the prlimit and prlimit64
- syscalls, which some libc implementations use under the hood.
- Fixes bug 15221; bugfix on 0.2.5.1-alpha.
- - Avoid a 10-second delay when starting as a client with "Sandbox 1"
- enabled and no DNS resolvers configured. This should help TAILS
- start up faster. Fixes bug 18548; bugfix on 0.2.5.1-alpha.
- - Fix a crash when using offline master ed25519 keys with the Linux
- seccomp2 sandbox enabled. Fixes bug 17675; bugfix on 0.2.7.3-rc.
- - Allow statistics to be written to disk when "Sandbox 1" is
- enabled. Fixes bugs 19556 and 19957; bugfix on 0.2.5.1-alpha and
- 0.2.6.1-alpha respectively.
- o Minor bugfixes (logging):
- - In log messages that include a function name, use __FUNCTION__
- instead of __PRETTY_FUNCTION__. In GCC, these are synonymous, but
- with clang __PRETTY_FUNCTION__ has extra information we don't
- need. Fixes bug 16563; bugfix on 0.0.2pre8. Fix by Tom van
- der Woerdt.
- - Remove needless quotes from a log message about unparseable
- addresses. Fixes bug 17843; bugfix on 0.2.3.3-alpha.
- - Scrub service name in "unrecognized service ID" log messages.
- Fixes bug 18600; bugfix on 0.2.4.11-alpha.
- - When logging information about an unparsable networkstatus vote or
- consensus, do not say "vote" when we mean consensus. Fixes bug
- 18368; bugfix on 0.2.0.8-alpha.
- - When we can't generate a signing key because OfflineMasterKey is
- set, do not imply that we should have been able to load it. Fixes
- bug 18133; bugfix on 0.2.7.2-alpha.
- - When logging a malformed hostname received through socks4, scrub
- it if SafeLogging says we should. Fixes bug 17419; bugfix
- on 0.1.1.16-rc.
- o Minor bugfixes (memory safety):
- - Avoid freeing an uninitialized pointer when opening a socket fails
- in get_interface_addresses_ioctl(). Fixes bug 18454; bugfix on
- 0.2.3.11-alpha. Reported by toralf and "cypherpunks", patch
- by teor.
- - Fix a memory leak in "tor --list-fingerprint". Fixes part of bug
- 18672; bugfix on 0.2.5.1-alpha.
- - Fix a memory leak in tor-gencert. Fixes part of bug 18672; bugfix
- on 0.2.0.1-alpha.
- o Minor bugfixes (pluggable transports):
- - Avoid reporting a spurious error when we decide that we don't need
- to terminate a pluggable transport because it has already exited.
- Fixes bug 18686; bugfix on 0.2.5.5-alpha.
- o Minor bugfixes (pointer arithmetic):
- - Fix a bug in memarea_alloc() that could have resulted in remote
- heap write access, if Tor had ever passed an unchecked size to
- memarea_alloc(). Fortunately, all the sizes we pass to
- memarea_alloc() are pre-checked to be less than 128 kilobytes.
- Fixes bug 19150; bugfix on 0.2.1.1-alpha. Bug found by
- Guido Vranken.
- o Minor bugfixes (private directory):
- - Prevent a race condition when creating private directories. Fixes
- part of bug 17852; bugfix on 0.0.2pre13. Part of ticket 17852.
- Patch from jsturgix. Found with Flawfinder.
- o Minor bugfixes (relays):
- - Check that both the ORPort and DirPort (if present) are reachable
- before publishing a relay descriptor. Otherwise, relays publish a
- descriptor with DirPort 0 when the DirPort reachability test takes
- longer than the ORPort reachability test. Fixes bug 18050; bugfix
- on 0.1.0.1-rc. Reported by "starlight", patch by teor.
- - Resolve some edge cases where we might launch an ORPort
- reachability check even when DisableNetwork is set. Noticed while
- fixing bug 18616; bugfix on 0.2.3.9-alpha.
- o Minor bugfixes (relays, hidden services):
- - Refuse connection requests to private OR addresses unless
- ExtendAllowPrivateAddresses is set. Previously, tor would connect,
- then refuse to send any cells to a private address. Fixes bugs
- 17674 and 8976; bugfix on 0.2.3.21-rc. Patch by teor.
- o Minor bugfixes (security, hidden services):
- - Prevent hidden services connecting to client-supplied rendezvous
- addresses that are reserved as internal or multicast. Fixes bug
- 8976; bugfix on 0.2.3.21-rc. Patch by dgoulet and teor.
- o Minor bugfixes (statistics):
- - Consistently check for overflow in round_*_to_next_multiple_of
- functions, and add unit tests with additional and maximal values.
- Fixes part of bug 13192; bugfix on 0.2.2.1-alpha.
- - Handle edge cases in the laplace functions: avoid division by
- zero, avoid taking the log of zero, and silence clang type
- conversion warnings using round and trunc. Add unit tests for edge
- cases with maximal values. Fixes part of bug 13192; bugfix
- on 0.2.6.2-alpha.
- - We now include consensus downloads via IPv6 in our directory-
- request statistics. Fixes bug 18460; bugfix on 0.2.3.14-alpha.
- o Minor bugfixes (test networks, IPv6):
- - Allow internal IPv6 addresses in descriptors in test networks.
- Fixes bug 17153; bugfix on 0.2.3.16-alpha. Patch by teor, reported
- by karsten.
- o Minor bugfixes (testing):
- - Check the full results of SHA256 and SHA512 digests in the unit
- tests. Bugfix on 0.2.2.4-alpha. Patch by teor.
- - Fix a memory leak in the ntor test. Fixes bug 17778; bugfix
- on 0.2.4.8-alpha.
- - Fix a small memory leak that would occur when the
- TestingEnableCellStatsEvent option was turned on. Fixes bug 18673;
- bugfix on 0.2.5.2-alpha.
- - Make unit tests pass on IPv6-only systems, and systems without
- localhost addresses (like some FreeBSD jails). Fixes bug 17632;
- bugfix on 0.2.7.3-rc. Patch by teor.
- - The test for log_heartbeat was incorrectly failing in timezones
- with non-integer offsets. Instead of comparing the end of the time
- string against a constant, compare it to the output of
- format_local_iso_time when given the correct input. Fixes bug
- 18039; bugfix on 0.2.5.4-alpha.
- - We no longer disable assertions in the unit tests when coverage is
- enabled. Instead, we require you to say --disable-asserts-in-tests
- to the configure script if you need assertions disabled in the
- unit tests (for example, if you want to perform branch coverage).
- Fixes bug 18242; bugfix on 0.2.7.1-alpha.
- o Minor bugfixes (time handling):
- - When correcting a corrupt 'struct tm' value, fill in the tm_wday
- field. Otherwise, our unit tests crash on Windows. Fixes bug
- 18977; bugfix on 0.2.2.25-alpha.
- - Avoid overflow in tor_timegm when parsing dates in and after 2038
- on platforms with 32-bit time_t. Fixes bug 18479; bugfix on
- 0.0.2pre14. Patch by teor.
- o Minor bugfixes (tor-gencert):
- - Correctly handle the case where an authority operator enters a
- passphrase but sends an EOF before sending a newline. Fixes bug
- 17443; bugfix on 0.2.0.20-rc. Found by junglefowl.
- o Code simplification and refactoring:
- - Clean up a little duplicated code in
- crypto_expand_key_material_TAP(). Closes ticket 17587; patch
- from "pfrankw".
- - Decouple the list of streams waiting to be attached to circuits
- from the overall connection list. This change makes it possible to
- attach streams quickly while simplifying Tor's callgraph and
- avoiding O(N) scans of the entire connection list. Closes
- ticket 17590.
- - Extract the more complicated parts of circuit_mark_for_close()
- into a new function that we run periodically before circuits are
- freed. This change removes more than half of the functions
- currently in the "blob". Closes ticket 17218.
- - Move logging of redundant policy entries in
- policies_parse_exit_policy_internal into its own function. Closes
- ticket 17608; patch from "juce".
- - Quote all the string interpolations in configure.ac -- even those
- which we are pretty sure can't contain spaces. Closes ticket
- 17744. Patch from zerosion.
- - Remove code for configuring OpenSSL dynamic locks; OpenSSL doesn't
- use them. Closes ticket 17926.
- - Remove specialized code for non-inplace AES_CTR. 99% of our AES is
- inplace, so there's no need to have a separate implementation for
- the non-inplace code. Closes ticket 18258. Patch from Malek.
- - Simplify return types for some crypto functions that can't
- actually fail. Patch from Hassan Alsibyani. Closes ticket 18259.
- - When a direct directory request fails immediately on launch,
- instead of relaunching that request from inside the code that
- launches it, instead mark the connection for teardown. This change
- simplifies Tor's callback and prevents the directory-request
- launching code from invoking itself recursively. Closes
- ticket 17589.
- o Documentation:
- - Add a description of the correct use of the '--keygen' command-
- line option. Closes ticket 17583; based on text by 's7r'.
- - Change build messages to refer to "Fedora" instead of "Fedora
- Core", and "dnf" instead of "yum". Closes tickets 18459 and 18426.
- Patches from "icanhasaccount" and "cypherpunks".
- - Document the contents of the 'datadir/keys' subdirectory in the
- manual page. Closes ticket 17621.
- - Document the minimum HeartbeatPeriod value. Closes ticket 15638.
- - Explain actual minima for BandwidthRate. Closes ticket 16382.
- - Fix a minor formatting typo in the manpage. Closes ticket 17791.
- - Mention torspec URL in the manpage and point the reader to it
- whenever we mention a document that belongs in torspce. Fixes
- issue 17392.
- - Stop recommending use of nicknames to identify relays in our
- MapAddress documentation. Closes ticket 18312.
- o Removed features:
- - Remove client-side support for connecting to Tor relays running
- versions of Tor before 0.2.3.6-alpha. These relays didn't support
- the v3 TLS handshake protocol, and are no longer allowed on the
- Tor network. Implements the client side of ticket 11150. Based on
- patches by Tom van der Woerdt.
- - We no longer maintain an internal freelist in memarea.c.
- Allocators should be good enough to make this code unnecessary,
- and it's doubtful that it ever had any performance benefit.
- o Testing:
- - Add unit tests to check for common RNG failure modes, such as
- returning all zeroes, identical values, or incrementing values
- (OpenSSL's rand_predictable feature). Patch by teor.
- - Always test both ed25519 backends, so that we can be sure that our
- batch-open replacement code works. Part of ticket 16794.
- - Cover dns_resolve_impl() in dns.c with unit tests. Implements a
- portion of ticket 16831.
- - Fix several warnings from clang's address sanitizer produced in
- the unit tests.
- - Log more information when the backtrace tests fail. Closes ticket
- 17892. Patch from "cypherpunks."
- - More unit tests for compat_libevent.c, procmon.c, tortls.c,
- util_format.c, directory.c, and options_validate.c. Closes tickets
- 17075, 17082, 17084, 17003, and 17076 respectively. Patches from
- Ola Bini.
- - Treat backtrace test failures as expected on FreeBSD until we
- solve bug 17808. Closes ticket 18204.
- - Unit tests for directory_handle_command_get. Closes ticket 17004.
- Patch from Reinaldo de Souza Jr.
- Changes in version 0.2.7.6 - 2015-12-10
- Tor version 0.2.7.6 fixes a major bug in entry guard selection, as
- well as a minor bug in hidden service reliability.
- o Major bugfixes (guard selection):
- - Actually look at the Guard flag when selecting a new directory
- guard. When we implemented the directory guard design, we
- accidentally started treating all relays as if they have the Guard
- flag during guard selection, leading to weaker anonymity and worse
- performance. Fixes bug 17772; bugfix on 0.2.4.8-alpha. Discovered
- by Mohsen Imani.
- o Minor features (geoip):
- - Update geoip and geoip6 to the December 1 2015 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (compilation):
- - When checking for net/pfvar.h, include netinet/in.h if possible.
- This fixes transparent proxy detection on OpenBSD. Fixes bug
- 17551; bugfix on 0.1.2.1-alpha. Patch from "rubiate".
- - Fix a compilation warning with Clang 3.6: Do not check the
- presence of an address which can never be NULL. Fixes bug 17781.
- o Minor bugfixes (correctness):
- - When displaying an IPv6 exit policy, include the mask bits
- correctly even when the number is greater than 31. Fixes bug
- 16056; bugfix on 0.2.4.7-alpha. Patch from "gturner".
- - The wrong list was used when looking up expired intro points in a
- rend service object, causing what we think could be reachability
- issues for hidden services, and triggering a BUG log. Fixes bug
- 16702; bugfix on 0.2.7.2-alpha.
- - Fix undefined behavior in the tor_cert_checksig function. Fixes
- bug 17722; bugfix on 0.2.7.2-alpha.
- Changes in version 0.2.7.5 - 2015-11-20
- The Tor 0.2.7 release series is dedicated to the memory of Tor user
- and privacy advocate Caspar Bowden (1961-2015). Caspar worked
- tirelessly to advocate human rights regardless of national borders,
- and oppose the encroachments of mass surveillance. He opposed national
- exceptionalism, he brought clarity to legal and policy debates, he
- understood and predicted the impact of mass surveillance on the world,
- and he laid the groundwork for resisting it. While serving on the Tor
- Project's board of directors, he brought us his uncompromising focus
- on technical excellence in the service of humankind. Caspar was an
- inimitable force for good and a wonderful friend. He was kind,
- humorous, generous, gallant, and believed we should protect one
- another without exception. We honor him here for his ideals, his
- efforts, and his accomplishments. Please honor his memory with works
- that would make him proud.
- Tor 0.2.7.5 is the first stable release in the Tor 0.2.7 series.
- The 0.2.7 series adds a more secure identity key type for relays,
- improves cryptography performance, resolves several longstanding
- hidden-service performance issues, improves controller support for
- hidden services, and includes small bugfixes and performance
- improvements throughout the program. This release series also includes
- more tests than before, and significant simplifications to which parts
- of Tor invoke which others. For a full list of changes, see below.
- o New system requirements:
- - Tor no longer includes workarounds to support Libevent versions
- before 1.3e. Libevent 2.0 or later is recommended. Closes
- ticket 15248.
- - Tor no longer supports copies of OpenSSL that are missing support
- for Elliptic Curve Cryptography. (We began using ECC when
- available in 0.2.4.8-alpha, for more safe and efficient key
- negotiation.) In particular, support for at least one of P256 or
- P224 is now required, with manual configuration needed if only
- P224 is available. Resolves ticket 16140.
- - Tor no longer supports versions of OpenSSL before 1.0. (If you are
- on an operating system that has not upgraded to OpenSSL 1.0 or
- later, and you compile Tor from source, you will need to install a
- more recent OpenSSL to link Tor against.) These versions of
- OpenSSL are still supported by the OpenSSL, but the numerous
- cryptographic improvements in later OpenSSL releases makes them a
- clear choice. Resolves ticket 16034.
- o Major features (controller):
- - Add the ADD_ONION and DEL_ONION commands that allow the creation
- and management of hidden services via the controller. Closes
- ticket 6411.
- - New "GETINFO onions/current" and "GETINFO onions/detached"
- commands to get information about hidden services created via the
- controller. Part of ticket 6411.
- - New HSFETCH command to launch a request for a hidden service
- descriptor. Closes ticket 14847.
- - New HSPOST command to upload a hidden service descriptor. Closes
- ticket 3523. Patch by "DonnchaC".
- o Major features (Ed25519 identity keys, Proposal 220):
- - Add support for offline encrypted Ed25519 master keys. To use this
- feature on your tor relay, run "tor --keygen" to make a new master
- key (or to make a new signing key if you already have a master
- key). Closes ticket 13642.
- - All relays now maintain a stronger identity key, using the Ed25519
- elliptic curve signature format. This master key is designed so
- that it can be kept offline. Relays also generate an online
- signing key, and a set of other Ed25519 keys and certificates.
- These are all automatically regenerated and rotated as needed.
- Implements part of ticket 12498.
- - Directory authorities now vote on Ed25519 identity keys along with
- RSA1024 keys. Implements part of ticket 12498.
- - Directory authorities track which Ed25519 identity keys have been
- used with which RSA1024 identity keys, and do not allow them to
- vary freely. Implements part of ticket 12498.
- - Microdescriptors now include Ed25519 identity keys. Implements
- part of ticket 12498.
- - Add a --newpass option to allow changing or removing the
- passphrase of an encrypted key with tor --keygen. Implements part
- of ticket 16769.
- - Add a new OfflineMasterKey option to tell Tor never to try loading
- or generating a secret Ed25519 identity key. You can use this in
- combination with tor --keygen to manage offline and/or encrypted
- Ed25519 keys. Implements ticket 16944.
- - On receiving a HUP signal, check to see whether the Ed25519
- signing key has changed, and reload it if so. Closes ticket 16790.
- - Significant usability improvements for Ed25519 key management. Log
- messages are better, and the code can recover from far more
- failure conditions. Thanks to "s7r" for reporting and diagnosing
- so many of these!
- o Major features (ECC performance):
- - Improve the runtime speed of Ed25519 signature verification by
- using Ed25519-donna's batch verification support. Implements
- ticket 16533.
- - Improve the speed of Ed25519 operations and Curve25519 keypair
- generation when built targeting 32 bit x86 platforms with SSE2
- available. Implements ticket 16535.
- - Improve the runtime speed of Ed25519 operations by using the
- public-domain Ed25519-donna by Andrew M. ("floodyberry").
- Implements ticket 16467.
- - Improve the runtime speed of the ntor handshake by using an
- optimized curve25519 basepoint scalarmult implementation from the
- public-domain Ed25519-donna by Andrew M. ("floodyberry"), based on
- ideas by Adam Langley. Implements ticket 9663.
- o Major features (Hidden services):
- - Hidden services, if using the EntryNodes option, are required to
- use more than one EntryNode, in order to avoid a guard discovery
- attack. (This would only affect people who had configured hidden
- services and manually specified the EntryNodes option with a
- single entry-node. The impact was that it would be easy to
- remotely identify the guard node used by such a hidden service.
- See ticket for more information.) Fixes ticket 14917.
- - Add the torrc option HiddenServiceNumIntroductionPoints, to
- specify a fixed number of introduction points. Its maximum value
- is 10 and default is 3. Using this option can increase a hidden
- service's reliability under load, at the cost of making it more
- visible that the hidden service is facing extra load. Closes
- ticket 4862.
- - Remove the adaptive algorithm for choosing the number of
- introduction points, which used to change the number of
- introduction points (poorly) depending on the number of
- connections the HS sees. Closes ticket 4862.
- o Major features (onion key cross-certification):
- - Relay descriptors now include signatures of their own identity
- keys, made using the TAP and ntor onion keys. These signatures
- allow relays to prove ownership of their own onion keys. Because
- of this change, microdescriptors will no longer need to include
- RSA identity keys. Implements proposal 228; closes ticket 12499.
- o Major bugfixes (client-side privacy, also in 0.2.6.9):
- - Properly separate out each SOCKSPort when applying stream
- isolation. The error occurred because each port's session group
- was being overwritten by a default value when the listener
- connection was initialized. Fixes bug 16247; bugfix on
- 0.2.6.3-alpha. Patch by "jojelino".
- o Major bugfixes (hidden service clients, stability, also in 0.2.6.10):
- - Stop refusing to store updated hidden service descriptors on a
- client. This reverts commit 9407040c59218 (which indeed fixed bug
- 14219, but introduced a major hidden service reachability
- regression detailed in bug 16381). This is a temporary fix since
- we can live with the minor issue in bug 14219 (it just results in
- some load on the network) but the regression of 16381 is too much
- of a setback. First-round fix for bug 16381; bugfix
- on 0.2.6.3-alpha.
- o Major bugfixes (hidden services):
- - Revert commit that made directory authorities assign the HSDir
- flag to relays without a DirPort; this was bad because such relays
- can't handle BEGIN_DIR cells. Fixes bug 15850; bugfix
- on 0.2.6.3-alpha.
- - When cannibalizing a circuit for an introduction point, always
- extend to the chosen exit node (creating a 4 hop circuit).
- Previously Tor would use the current circuit exit node, which
- changed the original choice of introduction point, and could cause
- the hidden service to skip excluded introduction points or
- reconnect to a skipped introduction point. Fixes bug 16260; bugfix
- on 0.1.0.1-rc.
- o Major bugfixes (memory leaks):
- - Fix a memory leak in ed25519 batch signature checking. Fixes bug
- 17398; bugfix on 0.2.6.1-alpha.
- o Major bugfixes (open file limit):
- - The open file limit wasn't checked before calling
- tor_accept_socket_nonblocking(), which would make Tor exceed the
- limit. Now, before opening a new socket, Tor validates the open
- file limit just before, and if the max has been reached, return an
- error. Fixes bug 16288; bugfix on 0.1.1.1-alpha.
- o Major bugfixes (security, correctness):
- - Fix an error that could cause us to read 4 bytes before the
- beginning of an openssl string. This bug could be used to cause
- Tor to crash on systems with unusual malloc implementations, or
- systems with unusual hardening installed. Fixes bug 17404; bugfix
- on 0.2.3.6-alpha.
- o Major bugfixes (stability, also in 0.2.6.10):
- - Stop crashing with an assertion failure when parsing certain kinds
- of malformed or truncated microdescriptors. Fixes bug 16400;
- bugfix on 0.2.6.1-alpha. Found by "torkeln"; fix based on a patch
- by "cypherpunks_backup".
- - Stop random client-side assertion failures that could occur when
- connecting to a busy hidden service, or connecting to a hidden
- service while a NEWNYM is in progress. Fixes bug 16013; bugfix
- on 0.1.0.1-rc.
- o Minor features (client, SOCKS):
- - Add GroupWritable and WorldWritable options to unix-socket based
- SocksPort and ControlPort options. These options apply to a single
- socket, and override {Control,Socks}SocketsGroupWritable. Closes
- ticket 15220.
- - Relax the validation done to hostnames in SOCKS5 requests, and
- allow a single trailing '.' to cope with clients that pass FQDNs
- using that syntax to explicitly indicate that the domain name is
- fully-qualified. Fixes bug 16674; bugfix on 0.2.6.2-alpha.
- - Relax the validation of hostnames in SOCKS5 requests, allowing the
- character '_' to appear, in order to cope with domains observed in
- the wild that are serving non-RFC compliant records. Resolves
- ticket 16430.
- o Minor features (client-side privacy):
- - New KeepAliveIsolateSOCKSAuth option to indefinitely extend circuit
- lifespan when IsolateSOCKSAuth and streams with SOCKS
- authentication are attached to the circuit. This allows
- applications like TorBrowser to manage circuit lifetime on their
- own. Implements feature 15482.
- - When logging malformed hostnames from SOCKS5 requests, respect
- SafeLogging configuration. Fixes bug 16891; bugfix on 0.1.1.16-rc.
- o Minor features (clock-jump tolerance):
- - Recover better when our clock jumps back many hours, like might
- happen for Tails or Whonix users who start with a very wrong
- hardware clock, use Tor to discover a more accurate time, and then
- fix their clock. Resolves part of ticket 8766.
- o Minor features (command-line interface):
- - Make --hash-password imply --hush to prevent unnecessary noise.
- Closes ticket 15542. Patch from "cypherpunks".
- - Print a warning whenever we find a relative file path being used
- as torrc option. Resolves issue 14018.
- o Minor features (compilation):
- - Give a warning as early as possible when trying to build with an
- unsupported OpenSSL version. Closes ticket 16901.
- - Use C99 variadic macros when the compiler is not GCC. This avoids
- failing compilations on MSVC, and fixes a log-file-based race
- condition in our old workarounds. Original patch from Gisle Vanem.
- o Minor features (control protocol):
- - Support network-liveness GETINFO key and NETWORK_LIVENESS event in
- the control protocol. Resolves ticket 15358.
- o Minor features (controller):
- - Add DirAuthority lines for default directory authorities to the
- output of the "GETINFO config/defaults" command if not already
- present. Implements ticket 14840.
- - Controllers can now use "GETINFO hs/client/desc/id/..." to
- retrieve items from the client's hidden service descriptor cache.
- Closes ticket 14845.
- - Implement a new controller command "GETINFO status/fresh-relay-
- descs" to fetch a descriptor/extrainfo pair that was generated on
- demand just for the controller's use. Implements ticket 14784.
- o Minor features (directory authorities):
- - Directory authorities no longer vote against the "Fast", "Stable",
- and "HSDir" flags just because they were going to vote against
- "Running": if the consensus turns out to be that the router was
- running, then the authority's vote should count. Patch from Peter
- Retzlaff; closes issue 8712.
- o Minor features (directory authorities, security, also in 0.2.6.9):
- - The HSDir flag given by authorities now requires the Stable flag.
- For the current network, this results in going from 2887 to 2806
- HSDirs. Also, it makes it harder for an attacker to launch a sybil
- attack by raising the effort for a relay to become Stable to
- require at the very least 7 days, while maintaining the 96 hours
- uptime requirement for HSDir. Implements ticket 8243.
- o Minor features (DoS-resistance):
- - Make it harder for attackers to overload hidden services with
- introductions, by blocking multiple introduction requests on the
- same circuit. Resolves ticket 15515.
- o Minor features (geoip):
- - Update geoip and geoip6 to the October 9 2015 Maxmind GeoLite2
- Country database.
- o Minor features (hidden services):
- - Add the new options "HiddenServiceMaxStreams" and
- "HiddenServiceMaxStreamsCloseCircuit" to allow hidden services to
- limit the maximum number of simultaneous streams per circuit, and
- optionally tear down the circuit when the limit is exceeded. Part
- of ticket 16052.
- - Client now uses an introduction point failure cache to know when
- to fetch or keep a descriptor in their cache. Previously, failures
- were recorded implicitly, but not explicitly remembered. Closes
- ticket 16389.
- - Relays need to have the Fast flag to get the HSDir flag. As this
- is being written, we'll go from 2745 HSDirs down to 2342, a ~14%
- drop. This change should make some attacks against the hidden
- service directory system harder. Fixes ticket 15963.
- - Turn on hidden service statistics collection by setting the torrc
- option HiddenServiceStatistics to "1" by default. (This keeps
- track only of the fraction of traffic used by hidden services, and
- the total number of hidden services in existence.) Closes
- ticket 15254.
- - To avoid leaking HS popularity, don't cycle the introduction point
- when we've handled a fixed number of INTRODUCE2 cells but instead
- cycle it when a random number of introductions is reached, thus
- making it more difficult for an attacker to find out the amount of
- clients that have used the introduction point for a specific HS.
- Closes ticket 15745.
- o Minor features (logging):
- - Include the Tor version in all LD_BUG log messages, since people
- tend to cut and paste those into the bugtracker. Implements
- ticket 15026.
- o Minor features (pluggable transports):
- - When launching managed pluggable transports on Linux systems,
- attempt to have the kernel deliver a SIGTERM on tor exit if the
- pluggable transport process is still running. Resolves
- ticket 15471.
- - When launching managed pluggable transports, setup a valid open
- stdin in the child process that can be used to detect if tor has
- terminated. The "TOR_PT_EXIT_ON_STDIN_CLOSE" environment variable
- can be used by implementations to detect this new behavior.
- Resolves ticket 15435.
- o Minor bugfixes (torrc exit policies):
- - In each instance above, usage advice is provided to avoid the
- message. Resolves ticket 16069. Patch by "teor". Fixes part of bug
- 16069; bugfix on 0.2.4.7-alpha.
- - In torrc, "accept6 *" and "reject6 *" ExitPolicy lines now only
- produce IPv6 wildcard addresses. Previously they would produce
- both IPv4 and IPv6 wildcard addresses. Patch by "teor". Fixes part
- of bug 16069; bugfix on 0.2.4.7-alpha.
- - When parsing torrc ExitPolicies, we now issue an info-level
- message when expanding an "accept/reject *" line to include both
- IPv4 and IPv6 wildcard addresses. Related to ticket 16069.
- - When parsing torrc ExitPolicies, we now warn for a number of cases
- where the user's intent is likely to differ from Tor's actual
- behavior. These include: using an IPv4 address with an accept6 or
- reject6 line; using "private" on an accept6 or reject6 line; and
- including any ExitPolicy lines after accept *:* or reject *:*.
- Related to ticket 16069.
- o Minor bugfixes (command-line interface):
- - When "--quiet" is provided along with "--validate-config", do not
- write anything to stdout on success. Fixes bug 14994; bugfix
- on 0.2.3.3-alpha.
- - When complaining about bad arguments to "--dump-config", use
- stderr, not stdout.
- - Print usage information for --dump-config when it is used without
- an argument. Also, fix the error message to use different wording
- and add newline at the end. Fixes bug 15541; bugfix
- on 0.2.5.1-alpha.
- o Minor bugfixes (compilation):
- - Fix compilation of sandbox.c with musl-libc. Fixes bug 17347;
- bugfix on 0.2.5.1-alpha. Patch from 'jamestk'.
- - Repair compilation with the most recent (unreleased, alpha)
- vesions of OpenSSL 1.1. Fixes part of ticket 17237.
- o Minor bugfixes (compilation, also in 0.2.6.9):
- - Build with --enable-systemd correctly when libsystemd is
- installed, but systemd is not. Fixes bug 16164; bugfix on
- 0.2.6.3-alpha. Patch from Peter Palfrader.
- o Minor bugfixes (configuration, unit tests):
- - Only add the default fallback directories when the DirAuthorities,
- AlternateDirAuthority, and FallbackDir directory config options
- are set to their defaults. The default fallback directory list is
- currently empty, this fix will only change tor's behavior when it
- has default fallback directories. Includes unit tests for
- consider_adding_dir_servers(). Fixes bug 15642; bugfix on
- 90f6071d8dc0 in 0.2.4.7-alpha. Patch by "teor".
- o Minor bugfixes (controller):
- - Add the descriptor ID in each HS_DESC control event. It was
- missing, but specified in control-spec.txt. Fixes bug 15881;
- bugfix on 0.2.5.2-alpha.
- o Minor bugfixes (correctness):
- - For correctness, avoid modifying a constant string in
- handle_control_postdescriptor. Fixes bug 15546; bugfix
- on 0.1.1.16-rc.
- - Remove side-effects from tor_assert() calls. This was harmless,
- because we never disable assertions, but it is bad style and
- unnecessary. Fixes bug 15211; bugfix on 0.2.5.5, 0.2.2.36,
- and 0.2.0.10.
- - When calling channel_free_list(), avoid calling smartlist_remove()
- while inside a FOREACH loop. This partially reverts commit
- 17356fe7fd96af where the correct SMARTLIST_DEL_CURRENT was
- incorrectly removed. Fixes bug 16924; bugfix on 0.2.4.4-alpha.
- o Minor bugfixes (crypto error-handling, also in 0.2.6.10):
- - Check for failures from crypto_early_init, and refuse to continue.
- A previous typo meant that we could keep going with an
- uninitialized crypto library, and would have OpenSSL initialize
- its own PRNG. Fixes bug 16360; bugfix on 0.2.5.2-alpha, introduced
- when implementing ticket 4900. Patch by "teor".
- o Minor bugfixes (hidden service):
- - Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
- a client authorized hidden service. Fixes bug 15823; bugfix
- on 0.2.1.6-alpha.
- - Remove an extraneous newline character from the end of hidden
- service descriptors. Fixes bug 15296; bugfix on 0.2.0.10-alpha.
- o Minor bugfixes (Linux seccomp2 sandbox):
- - Use the sandbox in tor_open_cloexec whether or not O_CLOEXEC is
- defined. Patch by "teor". Fixes bug 16515; bugfix on 0.2.3.1-alpha.
- - Allow bridge authorities to run correctly under the seccomp2
- sandbox. Fixes bug 16964; bugfix on 0.2.5.1-alpha.
- - Add the "hidserv-stats" filename to our sandbox filter for the
- HiddenServiceStatistics option to work properly. Fixes bug 17354;
- bugfix on 0.2.6.2-alpha. Patch from David Goulet.
- o Minor bugfixes (Linux seccomp2 sandbox, also in 0.2.6.10):
- - Allow pipe() and pipe2() syscalls in the seccomp2 sandbox: we need
- these when eventfd2() support is missing. Fixes bug 16363; bugfix
- on 0.2.6.3-alpha. Patch from "teor".
- o Minor bugfixes (Linux seccomp2 sandbox, also in 0.2.6.9):
- - Allow systemd connections to work with the Linux seccomp2 sandbox
- code. Fixes bug 16212; bugfix on 0.2.6.2-alpha. Patch by
- Peter Palfrader.
- - Fix sandboxing to work when running as a relay, by allowing the
- renaming of secret_id_key, and allowing the eventfd2 and futex
- syscalls. Fixes bug 16244; bugfix on 0.2.6.1-alpha. Patch by
- Peter Palfrader.
- o Minor bugfixes (logging):
- - When building Tor under Clang, do not include an extra set of
- parentheses in log messages that include function names. Fixes bug
- 15269; bugfix on every released version of Tor when compiled with
- recent enough Clang.
- o Minor bugfixes (network):
- - When attempting to use fallback technique for network interface
- lookup, disregard loopback and multicast addresses since they are
- unsuitable for public communications.
- o Minor bugfixes (open file limit):
- - Fix set_max_file_descriptors() to set by default the max open file
- limit to the current limit when setrlimit() fails. Fixes bug
- 16274; bugfix on tor- 0.2.0.10-alpha. Patch by dgoulet.
- o Minor bugfixes (portability):
- - Check correctly for Windows socket errors in the workqueue
- backend. Fixes bug 16741; bugfix on 0.2.6.3-alpha.
- - Try harder to normalize the exit status of the Tor process to the
- standard-provided range. Fixes bug 16975; bugfix on every version
- of Tor ever.
- - Use libexecinfo on FreeBSD to enable backtrace support. Fixes part
- of bug 17151; bugfix on 0.2.5.2-alpha. Patch from Marcin Cieślak.
- o Minor bugfixes (relay):
- - Ensure that worker threads actually exit when a fatal error or
- shutdown is indicated. This fix doesn't currently affect the
- behavior of Tor, because Tor workers never indicates fatal error
- or shutdown except in the unit tests. Fixes bug 16868; bugfix
- on 0.2.6.3-alpha.
- - Fix a rarely-encountered memory leak when failing to initialize
- the thread pool. Fixes bug 16631; bugfix on 0.2.6.3-alpha. Patch
- from "cypherpunks".
- - Unblock threads before releasing the work queue mutex to ensure
- predictable scheduling behavior. Fixes bug 16644; bugfix
- on 0.2.6.3-alpha.
- o Minor bugfixes (security, exit policies):
- - ExitPolicyRejectPrivate now also rejects the relay's published
- IPv6 address (if any), and any publicly routable IPv4 or IPv6
- addresses on any local interfaces. ticket 17027. Patch by "teor".
- Fixes bug 17027; bugfix on 0.2.0.11-alpha.
- o Minor bugfixes (statistics):
- - Disregard the ConnDirectionStatistics torrc options when Tor is
- not a relay since in that mode of operation no sensible data is
- being collected and because Tor might run into measurement hiccups
- when running as a client for some time, then becoming a relay.
- Fixes bug 15604; bugfix on 0.2.2.35.
- o Minor bugfixes (systemd):
- - Tor's systemd unit file no longer contains extraneous spaces.
- These spaces would sometimes confuse tools like deb-systemd-
- helper. Fixes bug 16162; bugfix on 0.2.5.5-alpha.
- o Minor bugfixes (test networks):
- - When self-testing reachability, use ExtendAllowPrivateAddresses to
- determine if local/private addresses imply reachability. The
- previous fix used TestingTorNetwork, which implies
- ExtendAllowPrivateAddresses, but this excluded rare configurations
- where ExtendAllowPrivateAddresses is set but TestingTorNetwork is
- not. Fixes bug 15771; bugfix on 0.2.6.1-alpha. Patch by "teor",
- issue discovered by CJ Ess.
- o Minor bugfixes (tests, also in 0.2.6.9):
- - Fix a crash in the unit tests when built with MSVC2013. Fixes bug
- 16030; bugfix on 0.2.6.2-alpha. Patch from "NewEraCracker".
- o Code simplification and refactoring:
- - Change the function that's called when we need to retry all
- downloads so that it only reschedules the downloads to happen
- immediately, rather than launching them all at once itself. This
- further simplifies Tor's callgraph.
- - Define WINVER and _WIN32_WINNT centrally, in orconfig.h, in order
- to ensure they remain consistent and visible everywhere.
- - Move some format-parsing functions out of crypto.c and
- crypto_curve25519.c into crypto_format.c and/or util_format.c.
- - Move the client-only parts of init_keys() into a separate
- function. Closes ticket 16763.
- - Move the hacky fallback code out of get_interface_address6() into
- separate function and get it covered with unit-tests. Resolves
- ticket 14710.
- - Refactor hidden service client-side cache lookup to intelligently
- report its various failure cases, and disentangle failure cases
- involving a lack of introduction points. Closes ticket 14391.
- - Remove some vestigial workarounds for the MSVC6 compiler. We
- haven't supported that in ages.
- - Remove the unused "nulterminate" argument from buf_pullup().
- - Simplify the microdesc_free() implementation so that it no longer
- appears (to code analysis tools) to potentially invoke a huge
- suite of other microdesc functions.
- - Simply the control graph further by deferring the inner body of
- directory_all_unreachable() into a callback. Closes ticket 16762.
- - The link authentication code has been refactored for better
- testability and reliability. It now uses code generated with the
- "trunnel" binary encoding generator, to reduce the risk of bugs
- due to programmer error. Done as part of ticket 12498.
- - Treat the loss of an owning controller as equivalent to a SIGTERM
- signal. This removes a tiny amount of duplicated code, and
- simplifies our callgraph. Closes ticket 16788.
- - Use our own Base64 encoder instead of OpenSSL's, to allow more
- control over the output. Part of ticket 15652.
- - When generating an event to send to the controller, we no longer
- put the event over the network immediately. Instead, we queue
- these events, and use a Libevent callback to deliver them. This
- change simplifies Tor's callgraph by reducing the number of
- functions from which all other Tor functions are reachable. Closes
- ticket 16695.
- - Wrap Windows-only C files inside '#ifdef _WIN32' so that tools
- that try to scan or compile every file on Unix won't decide that
- they are broken.
- o Documentation:
- - Fix capitalization of SOCKS in sample torrc. Closes ticket 15609.
- - Improve the descriptions of statistics-related torrc options in
- the manpage to describe rationale and possible uses cases. Fixes
- issue 15550.
- - Improve the layout and formatting of ./configure --help messages.
- Closes ticket 15024. Patch from "cypherpunks".
- - Include a specific and (hopefully) accurate documentation of the
- torrc file's meta-format in doc/torrc_format.txt. This is mainly
- of interest to people writing programs to parse or generate torrc
- files. This document is not a commitment to long-term
- compatibility; some aspects of the current format are a bit
- ridiculous. Closes ticket 2325.
- - Include the TUNING document in our source tarball. It is referred
- to in the ChangeLog and an error message. Fixes bug 16929; bugfix
- on 0.2.6.1-alpha.
- - Note that HiddenServicePorts can take a unix domain socket. Closes
- ticket 17364.
- - Recommend a 40 GB example AccountingMax in torrc.sample rather
- than a 4 GB max. Closes ticket 16742.
- - Standardize on the term "server descriptor" in the manual page.
- Previously, we had used "router descriptor", "server descriptor",
- and "relay descriptor" interchangeably. Part of ticket 14987.
- - Advise users on how to configure separate IPv4 and IPv6 exit
- policies in the manpage and sample torrcs. Related to ticket 16069.
- - Fix an error in the manual page and comments for
- TestingDirAuthVoteHSDir[IsStrict], which suggested that a HSDir
- required "ORPort connectivity". While this is true, it is in no
- way unique to the HSDir flag. Of all the flags, only HSDirs need a
- DirPort configured in order for the authorities to assign that
- particular flag. Patch by "teor". Fixed as part of 14882; bugfix
- on 0.2.6.3-alpha.
- - Fix the usage message of tor-resolve(1) so that it no longer lists
- the removed -F option. Fixes bug 16913; bugfix on 0.2.2.28-beta.
- o Removed code:
- - Remove `USE_OPENSSL_BASE64` and the corresponding fallback code
- and always use the internal Base64 decoder. The internal decoder
- has been part of tor since 0.2.0.10-alpha, and no one should
- be using the OpenSSL one. Part of ticket 15652.
- - Remove the 'tor_strclear()' function; use memwipe() instead.
- Closes ticket 14922.
- - Remove the code that would try to aggressively flush controller
- connections while writing to them. This code was introduced in
- 0.1.2.7-alpha, in order to keep output buffers from exceeding
- their limits. But there is no longer a maximum output buffer size,
- and flushing data in this way caused some undesirable recursions
- in our call graph. Closes ticket 16480.
- - The internal pure-C tor-fw-helper tool is now removed from the Tor
- distribution, in favor of the pure-Go clone available from
- https://gitweb.torproject.org/tor-fw-helper.git/ . The libraries
- used by the C tor-fw-helper are not, in our opinion, very
- confidence- inspiring in their secure-programming techniques.
- Closes ticket 13338.
- o Removed features:
- - Remove the (seldom-used) DynamicDHGroups feature. For anti-
- fingerprinting we now recommend pluggable transports; for forward-
- secrecy in TLS, we now use the P-256 group. Closes ticket 13736.
- - Remove the HidServDirectoryV2 option. Now all relays offer to
- store hidden service descriptors. Related to 16543.
- - Remove the VoteOnHidServDirectoriesV2 option, since all
- authorities have long set it to 1. Closes ticket 16543.
- - Remove the undocumented "--digests" command-line option. It
- complicated our build process, caused subtle build issues on
- multiple platforms, and is now redundant since we started
- including git version identifiers. Closes ticket 14742.
- - Tor no longer contains checks for ancient directory cache versions
- that didn't know about microdescriptors.
- - Tor no longer contains workarounds for stat files generated by
- super-old versions of Tor that didn't choose guards sensibly.
- o Testing:
- - The test-network.sh script now supports performance testing.
- Requires corresponding chutney performance testing changes. Patch
- by "teor". Closes ticket 14175.
- - Add a new set of callgraph analysis scripts that use clang to
- produce a list of which Tor functions are reachable from which
- other Tor functions. We're planning to use these to help simplify
- our code structure by identifying illogical dependencies.
- - Add new 'test-full' and 'test-full-online' targets to run all
- tests, including integration tests with stem and chutney.
- - Autodetect CHUTNEY_PATH if the chutney and Tor sources are side-
- by-side in the same parent directory. Closes ticket 16903. Patch
- by "teor".
- - Document use of coverity, clang static analyzer, and clang dynamic
- undefined behavior and address sanitizers in doc/HACKING. Include
- detailed usage instructions in the blacklist. Patch by "teor".
- Closes ticket 15817.
- - Make "bridges+hs" the default test network. This tests almost all
- tor functionality during make test-network, while allowing tests
- to succeed on non-IPv6 systems. Requires chutney commit 396da92 in
- test-network-bridges-hs. Closes tickets 16945 (tor) and 16946
- (chutney). Patches by "teor".
- - Make the test-workqueue test work on Windows by initializing the
- network before we begin.
- - New make target (make test-network-all) to run multiple applicable
- chutney test cases. Patch from Teor; closes 16953.
- - Now that OpenSSL has its own scrypt implementation, add an unit
- test that checks for interoperability between libscrypt_scrypt()
- and OpenSSL's EVP_PBE_scrypt() so that we could not use libscrypt
- and rely on EVP_PBE_scrypt() whenever possible. Resolves
- ticket 16189.
- - The link authentication protocol code now has extensive tests.
- - The relay descriptor signature testing code now has
- extensive tests.
- - The test_workqueue program now runs faster, and is enabled by
- default as a part of "make check".
- - Unit test dns_resolve(), dns_clip_ttl() and dns_get_expiry_ttl()
- functions in dns.c. Implements a portion of ticket 16831.
- - Use environment variables rather than autoconf substitutions to
- send variables from the build system to the test scripts. This
- change should be easier to maintain, and cause 'make distcheck' to
- work better than before. Fixes bug 17148.
- - When building Tor with testing coverage enabled, run Chutney tests
- (if any) using the 'tor-cov' coverage binary.
- - When running test-network or test-stem, check for the absence of
- stem/chutney before doing any build operations.
- - Add a test to verify that the compiler does not eliminate our
- memwipe() implementation. Closes ticket 15377.
- - Add make rule `check-changes` to verify the format of changes
- files. Closes ticket 15180.
- - Add unit tests for control_event_is_interesting(). Add a compile-
- time check that the number of events doesn't exceed the capacity
- of control_event_t.event_mask. Closes ticket 15431, checks for
- bugs similar to 13085. Patch by "teor".
- - Command-line argument tests moved to Stem. Resolves ticket 14806.
- - Integrate the ntor, backtrace, and zero-length keys tests into the
- automake test suite. Closes ticket 15344.
- - Remove assertions during builds to determine Tor's test coverage.
- We don't want to trigger these even in assertions, so including
- them artificially makes our branch coverage look worse than it is.
- This patch provides the new test-stem-full and coverage-html-full
- configure options. Implements ticket 15400.
- - New TestingDirAuthVote{Exit,Guard,HSDir}IsStrict flags to
- explicitly manage consensus flags in testing networks. Patch by
- "robgjansen", modified by "teor". Implements part of ticket 14882.
- - Check for matching value in server response in ntor_ref.py. Fixes
- bug 15591; bugfix on 0.2.4.8-alpha. Reported and fixed
- by "joelanders".
- - Set the severity correctly when testing
- get_interface_addresses_ifaddrs() and
- get_interface_addresses_win32(), so that the tests fail gracefully
- instead of triggering an assertion. Fixes bug 15759; bugfix on
- 0.2.6.3-alpha. Reported by Nicolas Derive.
- Changes in version 0.2.6.10 - 2015-07-12
- Tor version 0.2.6.10 fixes some significant stability and hidden
- service client bugs, bulletproofs the cryptography init process, and
- fixes a bug when using the sandbox code with some older versions of
- Linux. Everyone running an older version, especially an older version
- of 0.2.6, should upgrade.
- o Major bugfixes (hidden service clients, stability):
- - Stop refusing to store updated hidden service descriptors on a
- client. This reverts commit 9407040c59218 (which indeed fixed bug
- 14219, but introduced a major hidden service reachability
- regression detailed in bug 16381). This is a temporary fix since
- we can live with the minor issue in bug 14219 (it just results in
- some load on the network) but the regression of 16381 is too much
- of a setback. First-round fix for bug 16381; bugfix
- on 0.2.6.3-alpha.
- o Major bugfixes (stability):
- - Stop crashing with an assertion failure when parsing certain kinds
- of malformed or truncated microdescriptors. Fixes bug 16400;
- bugfix on 0.2.6.1-alpha. Found by "torkeln"; fix based on a patch
- by "cypherpunks_backup".
- - Stop random client-side assertion failures that could occur when
- connecting to a busy hidden service, or connecting to a hidden
- service while a NEWNYM is in progress. Fixes bug 16013; bugfix
- on 0.1.0.1-rc.
- o Minor features (geoip):
- - Update geoip to the June 3 2015 Maxmind GeoLite2 Country database.
- - Update geoip6 to the June 3 2015 Maxmind GeoLite2 Country database.
- o Minor bugfixes (crypto error-handling):
- - Check for failures from crypto_early_init, and refuse to continue.
- A previous typo meant that we could keep going with an
- uninitialized crypto library, and would have OpenSSL initialize
- its own PRNG. Fixes bug 16360; bugfix on 0.2.5.2-alpha, introduced
- when implementing ticket 4900. Patch by "teor".
- o Minor bugfixes (Linux seccomp2 sandbox):
- - Allow pipe() and pipe2() syscalls in the seccomp2 sandbox: we need
- these when eventfd2() support is missing. Fixes bug 16363; bugfix
- on 0.2.6.3-alpha. Patch from "teor".
- Changes in version 0.2.6.9 - 2015-06-11
- Tor 0.2.6.9 fixes a regression in the circuit isolation code, increases the
- requirements for receiving an HSDir flag, and addresses some other small
- bugs in the systemd and sandbox code. Clients using circuit isolation
- should upgrade; all directory authorities should upgrade.
- o Major bugfixes (client-side privacy):
- - Properly separate out each SOCKSPort when applying stream
- isolation. The error occurred because each port's session group was
- being overwritten by a default value when the listener connection
- was initialized. Fixes bug 16247; bugfix on 0.2.6.3-alpha. Patch
- by "jojelino".
- o Minor feature (directory authorities, security):
- - The HSDir flag given by authorities now requires the Stable flag.
- For the current network, this results in going from 2887 to 2806
- HSDirs. Also, it makes it harder for an attacker to launch a sybil
- attack by raising the effort for a relay to become Stable which
- takes at the very least 7 days to do so and by keeping the 96
- hours uptime requirement for HSDir. Implements ticket 8243.
- o Minor bugfixes (compilation):
- - Build with --enable-systemd correctly when libsystemd is
- installed, but systemd is not. Fixes bug 16164; bugfix on
- 0.2.6.3-alpha. Patch from Peter Palfrader.
- o Minor bugfixes (Linux seccomp2 sandbox):
- - Fix sandboxing to work when running as a relaymby renaming of
- secret_id_key, and allowing the eventfd2 and futex syscalls. Fixes
- bug 16244; bugfix on 0.2.6.1-alpha. Patch by Peter Palfrader.
- - Allow systemd connections to work with the Linux seccomp2 sandbox
- code. Fixes bug 16212; bugfix on 0.2.6.2-alpha. Patch by
- Peter Palfrader.
- o Minor bugfixes (tests):
- - Fix a crash in the unit tests when built with MSVC2013. Fixes bug
- 16030; bugfix on 0.2.6.2-alpha. Patch from "NewEraCracker".
- Changes in version 0.2.6.8 - 2015-05-21
- Tor 0.2.6.8 fixes a bit of dodgy code in parsing INTRODUCE2 cells, and
- fixes an authority-side bug in assigning the HSDir flag. All directory
- authorities should upgrade.
- o Major bugfixes (hidden services, backport from 0.2.7.1-alpha):
- - Revert commit that made directory authorities assign the HSDir
- flag to relays without a DirPort; this was bad because such relays
- can't handle BEGIN_DIR cells. Fixes bug 15850; bugfix
- on 0.2.6.3-alpha.
- o Minor bugfixes (hidden service, backport from 0.2.7.1-alpha):
- - Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
- a client authorized hidden service. Fixes bug 15823; bugfix
- on 0.2.1.6-alpha.
- o Minor features (geoip):
- - Update geoip to the April 8 2015 Maxmind GeoLite2 Country database.
- - Update geoip6 to the April 8 2015 Maxmind GeoLite2
- Country database.
- Changes in version 0.2.6.7 - 2015-04-06
- Tor 0.2.6.7 fixes two security issues that could be used by an
- attacker to crash hidden services, or crash clients visiting hidden
- services. Hidden services should upgrade as soon as possible; clients
- should upgrade whenever packages become available.
- This release also contains two simple improvements to make hidden
- services a bit less vulnerable to denial-of-service attacks.
- o Major bugfixes (security, hidden service):
- - Fix an issue that would allow a malicious client to trigger an
- assertion failure and halt a hidden service. Fixes bug 15600;
- bugfix on 0.2.1.6-alpha. Reported by "disgleirio".
- - Fix a bug that could cause a client to crash with an assertion
- failure when parsing a malformed hidden service descriptor. Fixes
- bug 15601; bugfix on 0.2.1.5-alpha. Found by "DonnchaC".
- o Minor features (DoS-resistance, hidden service):
- - Introduction points no longer allow multiple INTRODUCE1 cells to
- arrive on the same circuit. This should make it more expensive for
- attackers to overwhelm hidden services with introductions.
- Resolves ticket 15515.
- - Decrease the amount of reattempts that a hidden service performs
- when its rendezvous circuits fail. This reduces the computational
- cost for running a hidden service under heavy load. Resolves
- ticket 11447.
- Changes in version 0.2.5.12 - 2015-04-06
- Tor 0.2.5.12 backports two fixes from 0.2.6.7 for security issues that
- could be used by an attacker to crash hidden services, or crash clients
- visiting hidden services. Hidden services should upgrade as soon as
- possible; clients should upgrade whenever packages become available.
- This release also backports a simple improvement to make hidden
- services a bit less vulnerable to denial-of-service attacks.
- o Major bugfixes (security, hidden service):
- - Fix an issue that would allow a malicious client to trigger an
- assertion failure and halt a hidden service. Fixes bug 15600;
- bugfix on 0.2.1.6-alpha. Reported by "disgleirio".
- - Fix a bug that could cause a client to crash with an assertion
- failure when parsing a malformed hidden service descriptor. Fixes
- bug 15601; bugfix on 0.2.1.5-alpha. Found by "DonnchaC".
- o Minor features (DoS-resistance, hidden service):
- - Introduction points no longer allow multiple INTRODUCE1 cells to
- arrive on the same circuit. This should make it more expensive for
- attackers to overwhelm hidden services with introductions.
- Resolves ticket 15515.
- Changes in version 0.2.4.27 - 2015-04-06
- Tor 0.2.4.27 backports two fixes from 0.2.6.7 for security issues that
- could be used by an attacker to crash hidden services, or crash clients
- visiting hidden services. Hidden services should upgrade as soon as
- possible; clients should upgrade whenever packages become available.
- This release also backports a simple improvement to make hidden
- services a bit less vulnerable to denial-of-service attacks.
- o Major bugfixes (security, hidden service):
- - Fix an issue that would allow a malicious client to trigger an
- assertion failure and halt a hidden service. Fixes bug 15600;
- bugfix on 0.2.1.6-alpha. Reported by "disgleirio".
- - Fix a bug that could cause a client to crash with an assertion
- failure when parsing a malformed hidden service descriptor. Fixes
- bug 15601; bugfix on 0.2.1.5-alpha. Found by "DonnchaC".
- o Minor features (DoS-resistance, hidden service):
- - Introduction points no longer allow multiple INTRODUCE1 cells to
- arrive on the same circuit. This should make it more expensive for
- attackers to overwhelm hidden services with introductions.
- Resolves ticket 15515.
- Changes in version 0.2.6.6 - 2015-03-24
- Tor 0.2.6.6 is the first stable release in the 0.2.6 series.
- It adds numerous safety, security, correctness, and performance
- improvements. Client programs can be configured to use more kinds of
- sockets, AutomapHosts works better, the multithreading backend is
- improved, cell transmission is refactored, test coverage is much
- higher, more denial-of-service attacks are handled, guard selection is
- improved to handle long-term guards better, pluggable transports
- should work a bit better, and some annoying hidden service performance
- bugs should be addressed.
- o New compiler and system requirements:
- - Tor 0.2.6.x requires that your compiler support more of the C99
- language standard than before. The 'configure' script now detects
- whether your compiler supports C99 mid-block declarations and
- designated initializers. If it does not, Tor will not compile.
- We may revisit this requirement if it turns out that a significant
- number of people need to build Tor with compilers that don't
- bother implementing a 15-year-old standard. Closes ticket 13233.
- - Tor no longer supports systems without threading support. When we
- began working on Tor, there were several systems that didn't have
- threads, or where the thread support wasn't able to run the
- threads of a single process on multiple CPUs. That no longer
- holds: every system where Tor needs to run well now has threading
- support. Resolves ticket 12439.
- o Deprecated versions and removed support:
- - Tor relays older than 0.2.4.18-rc are no longer allowed to
- advertise themselves on the network. Closes ticket 13555.
- - Tor clients no longer support connecting to hidden services
- running on Tor 0.2.2.x and earlier; the Support022HiddenServices
- option has been removed. (There shouldn't be any hidden services
- running these versions on the network.) Closes ticket 7803.
- o Directory authority changes:
- - The directory authority Faravahar has a new IP address. This
- closes ticket 14487.
- - Remove turtles as a directory authority.
- - Add longclaw as a new (v3) directory authority. This implements
- ticket 13296. This keeps the directory authority count at 9.
- o Major features (bridges):
- - Expose the outgoing upstream HTTP/SOCKS proxy to pluggable
- transports if they are configured via the "TOR_PT_PROXY"
- environment variable. Implements proposal 232. Resolves
- ticket 8402.
- o Major features (changed defaults):
- - Prevent relay operators from unintentionally running exits: When a
- relay is configured as an exit node, we now warn the user unless
- the "ExitRelay" option is set to 1. We warn even more loudly if
- the relay is configured with the default exit policy, since this
- can indicate accidental misconfiguration. Setting "ExitRelay 0"
- stops Tor from running as an exit relay. Closes ticket 10067.
- o Major features (client performance, hidden services):
- - Allow clients to use optimistic data when connecting to a hidden
- service, which should remove a round-trip from hidden service
- initialization. See proposal 181 for details. Implements
- ticket 13211.
- o Major features (directory system):
- - Upon receiving an unparseable directory object, if its digest
- matches what we expected, then don't try to download it again.
- Previously, when we got a descriptor we didn't like, we would keep
- trying to download it over and over. Closes ticket 11243.
- - When downloading server- or microdescriptors from a directory
- server, we no longer launch multiple simultaneous requests to the
- same server. This reduces load on the directory servers,
- especially when directory guards are in use. Closes ticket 9969.
- - When downloading server- or microdescriptors over a tunneled
- connection, do not limit the length of our requests to what the
- Squid proxy is willing to handle. Part of ticket 9969.
- - Authorities can now vote on the correct digests and latest
- versions for different software packages. This allows packages
- that include Tor to use the Tor authority system as a way to get
- notified of updates and their correct digests. Implements proposal
- 227. Closes ticket 10395.
- o Major features (guards):
- - Introduce the Guardfraction feature to improves load balancing on
- guard nodes. Specifically, it aims to reduce the traffic gap that
- guard nodes experience when they first get the Guard flag. This is
- a required step if we want to increase the guard lifetime to 9
- months or greater. Closes ticket 9321.
- o Major features (hidden services):
- - Make HS port scanning more difficult by immediately closing the
- circuit when a user attempts to connect to a nonexistent port.
- Closes ticket 13667.
- - Add a HiddenServiceStatistics option that allows Tor relays to
- gather and publish statistics about the overall size and volume of
- hidden service usage. Specifically, when this option is turned on,
- an HSDir will publish an approximate number of hidden services
- that have published descriptors to it the past 24 hours. Also, if
- a relay has acted as a hidden service rendezvous point, it will
- publish the approximate amount of rendezvous cells it has relayed
- the past 24 hours. The statistics themselves are obfuscated so
- that the exact values cannot be derived. For more details see
- proposal 238, "Better hidden service stats from Tor relays". This
- feature is currently disabled by default. Implements feature 13192.
- o Major features (performance):
- - Make the CPU worker implementation more efficient by avoiding the
- kernel and lengthening pipelines. The original implementation used
- sockets to transfer data from the main thread to the workers, and
- didn't allow any thread to be assigned more than a single piece of
- work at once. The new implementation avoids communications
- overhead by making requests in shared memory, avoiding kernel IO
- where possible, and keeping more requests in flight at once.
- Implements ticket 9682.
- o Major features (relay):
- - Raise the minimum acceptable configured bandwidth rate for bridges
- to 50 KiB/sec and for relays to 75 KiB/sec. (The old values were
- 20 KiB/sec.) Closes ticket 13822.
- - Complete revision of the code that relays use to decide which cell
- to send next. Formerly, we selected the best circuit to write on
- each channel, but we didn't select among channels in any
- sophisticated way. Now, we choose the best circuits globally from
- among those whose channels are ready to deliver traffic.
- This patch implements a new inter-cmux comparison API, a global
- high/low watermark mechanism and a global scheduler loop for
- transmission prioritization across all channels as well as among
- circuits on one channel. This schedule is currently tuned to
- (tolerantly) avoid making changes in network performance, but it
- should form the basis for major circuit performance increases in
- the future. Code by Andrea; tuning by Rob Jansen; implements
- ticket 9262.
- o Major features (sample torrc):
- - Add a new, infrequently-changed "torrc.minimal". This file is
- similar to torrc.sample, but it will change as infrequently as
- possible, for the benefit of users whose systems prompt them for
- intervention whenever a default configuration file is changed.
- Making this change allows us to update torrc.sample to be a more
- generally useful "sample torrc".
- o Major features (security, unix domain sockets):
- - Allow SocksPort to be an AF_UNIX Unix Domain Socket. Now high risk
- applications can reach Tor without having to create AF_INET or
- AF_INET6 sockets, meaning they can completely disable their
- ability to make non-Tor network connections. To create a socket of
- this type, use "SocksPort unix:/path/to/socket". Implements
- ticket 12585.
- - Support mapping hidden service virtual ports to AF_UNIX sockets.
- The syntax is "HiddenServicePort 80 unix:/path/to/socket".
- Implements ticket 11485.
- o Major bugfixes (client, automap):
- - Repair automapping with IPv6 addresses. This automapping should
- have worked previously, but one piece of debugging code that we
- inserted to detect a regression actually caused the regression to
- manifest itself again. Fixes bug 13811 and bug 12831; bugfix on
- 0.2.4.7-alpha. Diagnosed and fixed by Francisco Blas
- Izquierdo Riera.
- o Major bugfixes (crash, OSX, security):
- - Fix a remote denial-of-service opportunity caused by a bug in
- OSX's _strlcat_chk() function. Fixes bug 15205; bug first appeared
- in OSX 10.9.
- o Major bugfixes (directory authorities):
- - Do not assign the HSDir flag to relays if they are not Valid, or
- currently hibernating. Fixes 12573; bugfix on 0.2.0.10-alpha.
- o Major bugfixes (directory bandwidth performance):
- - Don't flush the zlib buffer aggressively when compressing
- directory information for clients. This should save about 7% of
- the bandwidth currently used for compressed descriptors and
- microdescriptors. Fixes bug 11787; bugfix on 0.1.1.23.
- o Major bugfixes (exit node stability):
- - Fix an assertion failure that could occur under high DNS load.
- Fixes bug 14129; bugfix on Tor 0.0.7rc1. Found by "jowr";
- diagnosed and fixed by "cypherpunks".
- o Major bugfixes (FreeBSD IPFW transparent proxy):
- - Fix address detection with FreeBSD transparent proxies, when
- "TransProxyType ipfw" is in use. Fixes bug 15064; bugfix
- on 0.2.5.4-alpha.
- o Major bugfixes (hidden services):
- - When closing an introduction circuit that was opened in parallel
- with others, don't mark the introduction point as unreachable.
- Previously, the first successful connection to an introduction
- point would make the other introduction points get marked as
- having timed out. Fixes bug 13698; bugfix on 0.0.6rc2.
- o Major bugfixes (Linux seccomp2 sandbox):
- - Upon receiving sighup with the seccomp2 sandbox enabled, do not
- crash during attempts to call wait4. Fixes bug 15088; bugfix on
- 0.2.5.1-alpha. Patch from "sanic".
- o Major bugfixes (mixed relay-client operation):
- - When running as a relay and client at the same time (not
- recommended), if we decide not to use a new guard because we want
- to retry older guards, only close the locally-originating circuits
- passing through that guard. Previously we would close all the
- circuits through that guard. Fixes bug 9819; bugfix on
- 0.2.1.1-alpha. Reported by "skruffy".
- o Major bugfixes (pluggable transports):
- - Initialize the extended OR Port authentication cookie before
- launching pluggable transports. This prevents a race condition
- that occurred when server-side pluggable transports would cache the
- authentication cookie before it has been (re)generated. Fixes bug
- 15240; bugfix on 0.2.5.1-alpha.
- o Major bugfixes (relay, stability, possible security):
- - Fix a bug that could lead to a relay crashing with an assertion
- failure if a buffer of exactly the wrong layout is passed to
- buf_pullup() at exactly the wrong time. Fixes bug 15083; bugfix on
- 0.2.0.10-alpha. Patch from "cypherpunks".
- - Do not assert if the 'data' pointer on a buffer is advanced to the
- very end of the buffer; log a BUG message instead. Only assert if
- it is past that point. Fixes bug 15083; bugfix on 0.2.0.10-alpha.
- o Minor features (build):
- - New --disable-system-torrc compile-time option to prevent Tor from
- looking for the system-wide torrc or torrc-defaults files.
- Resolves ticket 13037.
- o Minor features (client):
- - Clients are now willing to send optimistic data (before they
- receive a 'connected' cell) to relays of any version. (Relays
- without support for optimistic data are no longer supported on the
- Tor network.) Resolves ticket 13153.
- o Minor features (client):
- - Validate hostnames in SOCKS5 requests more strictly. If SafeSocks
- is enabled, reject requests with IP addresses as hostnames.
- Resolves ticket 13315.
- o Minor features (controller):
- - Add a "SIGNAL HEARTBEAT" controller command that tells Tor to
- write an unscheduled heartbeat message to the log. Implements
- feature 9503.
- - Include SOCKS_USERNAME and SOCKS_PASSWORD values in controller
- events so controllers can observe circuit isolation inputs. Closes
- ticket 8405.
- - ControlPort now supports the unix:/path/to/socket syntax as an
- alternative to the ControlSocket option, for consistency with
- SocksPort and HiddenServicePort. Closes ticket 14451.
- - New "GETINFO bw-event-cache" to get information about recent
- bandwidth events. Closes ticket 14128. Useful for controllers to
- get recent bandwidth history after the fix for ticket 13988.
- - Messages about problems in the bootstrap process now include
- information about the server we were trying to connect to when we
- noticed the problem. Closes ticket 15006.
- o Minor features (Denial of service resistance):
- - Count the total number of bytes used storing hidden service
- descriptors against the value of MaxMemInQueues. If we're low on
- memory, and more than 20% of our memory is used holding hidden
- service descriptors, free them until no more than 10% of our
- memory holds hidden service descriptors. Free the least recently
- fetched descriptors first. Resolves ticket 13806.
- - When we have recently been under memory pressure (over 3/4 of
- MaxMemInQueues is allocated), then allocate smaller zlib objects
- for small requests. Closes ticket 11791.
- o Minor features (directory authorities):
- - Don't list relays with a bandwidth estimate of 0 in the consensus.
- Implements a feature proposed during discussion of bug 13000.
- - In tor-gencert, report an error if the user provides the same
- argument more than once.
- - If a directory authority can't find a best consensus method in the
- votes that it holds, it now falls back to its favorite consensus
- method. Previously, it fell back to method 1. Neither of these is
- likely to get enough signatures, but "fall back to favorite"
- doesn't require us to maintain support an obsolete consensus
- method. Implements part of proposal 215.
- o Minor features (geoip):
- - Update geoip to the March 3 2015 Maxmind GeoLite2 Country database.
- - Update geoip6 to the March 3 2015 Maxmind GeoLite2
- Country database.
- o Minor features (guard nodes):
- - Reduce the time delay before saving guard status to disk from 10
- minutes to 30 seconds (or from one hour to 10 minutes if
- AvoidDiskWrites is set). Closes ticket 12485.
- o Minor features (heartbeat):
- - On relays, report how many connections we negotiated using each
- version of the Tor link protocols. This information will let us
- know if removing support for very old versions of the Tor
- protocols is harming the network. Closes ticket 15212.
- o Minor features (hidden service):
- - Make Sybil attacks against hidden services harder by changing the
- minimum time required to get the HSDir flag from 25 hours up to 96
- hours. Addresses ticket 14149.
- - New option "HiddenServiceAllowUnknownPorts" to allow hidden
- services to disable the anti-scanning feature introduced in
- 0.2.6.2-alpha. With this option not set, a connection to an
- unlisted port closes the circuit. With this option set, only a
- RELAY_DONE cell is sent. Closes ticket 14084.
- - When re-enabling the network, don't try to build introduction
- circuits until we have successfully built a circuit. This makes
- hidden services come up faster when the network is re-enabled.
- Patch from "akwizgran". Closes ticket 13447.
- - When we fail to retrieve a hidden service descriptor, send the
- controller an "HS_DESC FAILED" controller event. Implements
- feature 13212.
- - New HiddenServiceDirGroupReadable option to cause hidden service
- directories and hostname files to be created group-readable. Patch
- from "anon", David Stainton, and "meejah". Closes ticket 11291.
- o Minor features (interface):
- - Implement "-f -" command-line option to read torrc configuration
- from standard input, if you don't want to store the torrc file in
- the file system. Implements feature 13865.
- o Minor features (logging):
- - Add a count of unique clients to the bridge heartbeat message.
- Resolves ticket 6852.
- - Suppress "router info incompatible with extra info" message when
- reading extrainfo documents from cache. (This message got loud
- around when we closed bug 9812 in 0.2.6.2-alpha.) Closes
- ticket 13762.
- - Elevate hidden service authorized-client message from DEBUG to
- INFO. Closes ticket 14015.
- - On Unix-like systems, you can now use named pipes as the target of
- the Log option, and other options that try to append to files.
- Closes ticket 12061. Patch from "carlo von lynX".
- - When opening a log file at startup, send it every log message that
- we generated between startup and opening it. Previously, log
- messages that were generated before opening the log file were only
- logged to stdout. Closes ticket 6938.
- - Add a TruncateLogFile option to overwrite logs instead of
- appending to them. Closes ticket 5583.
- - Quiet some log messages in the heartbeat and at startup. Closes
- ticket 14950.
- o Minor features (portability, Solaris):
- - Threads are no longer disabled by default on Solaris; we believe
- that the versions of Solaris with broken threading support are all
- obsolete by now. Resolves ticket 9495.
- o Minor features (relay):
- - Re-check our address after we detect a changed IP address from
- getsockname(). This ensures that the controller command "GETINFO
- address" will report the correct value. Resolves ticket 11582.
- Patch from "ra".
- - A new AccountingRule option lets Relays set whether they'd like
- AccountingMax to be applied separately to inbound and outbound
- traffic, or applied to the sum of inbound and outbound traffic.
- Resolves ticket 961. Patch by "chobe".
- - When identity keypair is generated for first time, log a
- congratulatory message that links to the new relay lifecycle
- document. Implements feature 10427.
- o Minor features (security, memory wiping):
- - Ensure we securely wipe keys from memory after
- crypto_digest_get_digest and init_curve25519_keypair_from_file
- have finished using them. Resolves ticket 13477.
- o Minor features (security, out-of-memory handling):
- - When handling an out-of-memory condition, allocate less memory for
- temporary data structures. Fixes issue 10115.
- - When handling an out-of-memory condition, consider more types of
- buffers, including those on directory connections, and zlib
- buffers. Resolves ticket 11792.
- o Minor features (stability):
- - Add assertions in our hash-table iteration code to check for
- corrupted values that could cause infinite loops. Closes
- ticket 11737.
- o Minor features (systemd):
- - Various improvements and modernizations in systemd hardening
- support. Closes ticket 13805. Patch from Craig Andrews.
- - Where supported, when running with systemd, report successful
- startup to systemd. Part of ticket 11016. Patch by Michael Scherer.
- - When running with systemd, support systemd watchdog messages. Part
- of ticket 11016. Patch by Michael Scherer.
- o Minor features (testing networks):
- - Add the TestingDirAuthVoteExit option, which lists nodes to assign
- the "Exit" flag regardless of their uptime, bandwidth, or exit
- policy. TestingTorNetwork must be set for this option to have any
- effect. Previously, authorities would take up to 35 minutes to
- give nodes the Exit flag in a test network. Partially implements
- ticket 13161.
- - Drop the minimum RendPostPeriod on a testing network to 5 seconds,
- and the default on a testing network to 2 minutes. Drop the
- MIN_REND_INITIAL_POST_DELAY on a testing network to 5 seconds, but
- keep the default on a testing network at 30 seconds. This reduces
- HS bootstrap time to around 25 seconds. Also, change the default
- time in test-network.sh to match. Closes ticket 13401. Patch
- by "teor".
- - Create TestingDirAuthVoteHSDir to correspond to
- TestingDirAuthVoteExit/Guard. Ensures that authorities vote the
- HSDir flag for the listed relays regardless of uptime or ORPort
- connectivity. Respects the value of VoteOnHidServDirectoriesV2.
- Partial implementation for ticket 14067. Patch by "teor".
- o Minor features (tor2web mode):
- - Introduce the config option Tor2webRendezvousPoints, which allows
- clients in Tor2webMode to select a specific Rendezvous Point to be
- used in HS circuits. This might allow better performance for
- Tor2Web nodes. Implements ticket 12844.
- o Minor features (transparent proxy):
- - Update the transparent proxy option checks to allow for both ipfw
- and pf on OS X. Closes ticket 14002.
- - Use the correct option when using IPv6 with transparent proxy
- support on Linux. Resolves 13808. Patch by Francisco Blas
- Izquierdo Riera.
- o Minor features (validation):
- - Check all date/time values passed to tor_timegm and
- parse_rfc1123_time for validity, taking leap years into account.
- Improves HTTP header validation. Implemented with bug 13476.
- - In correct_tm(), limit the range of values returned by system
- localtime(_r) and gmtime(_r) to be between the years 1 and 8099.
- This means we don't have to deal with negative or too large dates,
- even if a clock is wrong. Otherwise we might fail to read a file
- written by us which includes such a date. Fixes bug 13476.
- - Stop allowing invalid address patterns like "*/24" that contain
- both a wildcard address and a bit prefix length. This affects all
- our address-range parsing code. Fixes bug 7484; bugfix
- on 0.0.2pre14.
- o Minor bugfixes (bridge clients):
- - When configured to use a bridge without an identity digest (not
- recommended), avoid launching an extra channel to it when
- bootstrapping. Fixes bug 7733; bugfix on 0.2.4.4-alpha.
- o Minor bugfixes (bridges):
- - When DisableNetwork is set, do not launch pluggable transport
- plugins, and if any are running, terminate them. Fixes bug 13213;
- bugfix on 0.2.3.6-alpha.
- o Minor bugfixes (C correctness):
- - Fix several instances of possible integer overflow/underflow/NaN.
- Fixes bug 13104; bugfix on 0.2.3.1-alpha and later. Patches
- from "teor".
- - In circuit_build_times_calculate_timeout() in circuitstats.c,
- avoid dividing by zero in the pareto calculations. This traps
- under clang's "undefined-trap" sanitizer. Fixes bug 13290; bugfix
- on 0.2.2.2-alpha.
- - Fix an integer overflow in format_time_interval(). Fixes bug
- 13393; bugfix on 0.2.0.10-alpha.
- - Set the correct day of year value when the system's localtime(_r)
- or gmtime(_r) functions fail to set struct tm. Not externally
- visible. Fixes bug 13476; bugfix on 0.0.2pre14.
- - Avoid unlikely signed integer overflow in tor_timegm on systems
- with 32-bit time_t. Fixes bug 13476; bugfix on 0.0.2pre14.
- o Minor bugfixes (certificate handling):
- - If an authority operator accidentally makes a signing certificate
- with a future publication time, do not discard its real signing
- certificates. Fixes bug 11457; bugfix on 0.2.0.3-alpha.
- - Remove any old authority certificates that have been superseded
- for at least two days. Previously, we would keep superseded
- certificates until they expired, if they were published close in
- time to the certificate that superseded them. Fixes bug 11454;
- bugfix on 0.2.1.8-alpha.
- o Minor bugfixes (client):
- - Fix smartlist_choose_node_by_bandwidth() so that relays with the
- BadExit flag are not considered worthy candidates. Fixes bug
- 13066; bugfix on 0.1.2.3-alpha.
- - Use the consensus schedule for downloading consensuses, and not
- the generic schedule. Fixes bug 11679; bugfix on 0.2.2.6-alpha.
- - Handle unsupported or malformed SOCKS5 requests properly by
- responding with the appropriate error message before closing the
- connection. Fixes bugs 12971 and 13314; bugfix on 0.0.2pre13.
- o Minor bugfixes (client, automapping):
- - Avoid crashing on torrc lines for VirtualAddrNetworkIPv[4|6] when
- no value follows the option. Fixes bug 14142; bugfix on
- 0.2.4.7-alpha. Patch by "teor".
- - Fix a memory leak when using AutomapHostsOnResolve. Fixes bug
- 14195; bugfix on 0.1.0.1-rc.
- - Prevent changes to other options from removing the wildcard value
- "." from "AutomapHostsSuffixes". Fixes bug 12509; bugfix
- on 0.2.0.1-alpha.
- - Allow MapAddress and AutomapHostsOnResolve to work together when
- an address is mapped into another address type (like .onion) that
- must be automapped at resolve time. Fixes bug 7555; bugfix
- on 0.2.0.1-alpha.
- o Minor bugfixes (client, bridges):
- - When we are using bridges and we had a network connectivity
- problem, only retry connecting to our currently configured
- bridges, not all bridges we know about and remember using. Fixes
- bug 14216; bugfix on 0.2.2.17-alpha.
- o Minor bugfixes (client, DNS):
- - Report the correct cached DNS expiration times on SOCKS port or in
- DNS replies. Previously, we would report everything as "never
- expires." Fixes bug 14193; bugfix on 0.2.3.17-beta.
- - Avoid a small memory leak when we find a cached answer for a
- reverse DNS lookup in a client-side DNS cache. (Remember, client-
- side DNS caching is off by default, and is not recommended.) Fixes
- bug 14259; bugfix on 0.2.0.1-alpha.
- o Minor bugfixes (client, IPv6):
- - Reject socks requests to literal IPv6 addresses when IPv6Traffic
- flag is not set; and not because the NoIPv4Traffic flag was set.
- Previously we'd looked at the NoIPv4Traffic flag for both types of
- literal addresses. Fixes bug 14280; bugfix on 0.2.4.7-alpha.
- o Minor bugfixes (client, microdescriptors):
- - Use a full 256 bits of the SHA256 digest of a microdescriptor when
- computing which microdescriptors to download. This keeps us from
- erroneous download behavior if two microdescriptor digests ever
- have the same first 160 bits. Fixes part of bug 13399; bugfix
- on 0.2.3.1-alpha.
- - Reset a router's status if its microdescriptor digest changes,
- even if the first 160 bits remain the same. Fixes part of bug
- 13399; bugfix on 0.2.3.1-alpha.
- o Minor bugfixes (client, torrc):
- - Stop modifying the value of our DirReqStatistics torrc option just
- because we're not a bridge or relay. This bug was causing Tor
- Browser users to write "DirReqStatistics 0" in their torrc files
- as if they had chosen to change the config. Fixes bug 4244; bugfix
- on 0.2.3.1-alpha.
- - When GeoIPExcludeUnknown is enabled, do not incorrectly decide
- that our options have changed every time we SIGHUP. Fixes bug
- 9801; bugfix on 0.2.4.10-alpha. Patch from "qwerty1".
- o Minor bugfixes (compilation):
- - Fix a compilation warning on s390. Fixes bug 14988; bugfix
- on 0.2.5.2-alpha.
- - Silence clang warnings under --enable-expensive-hardening,
- including implicit truncation of 64 bit values to 32 bit, const
- char assignment to self, tautological compare, and additional
- parentheses around equality tests. Fixes bug 13577; bugfix
- on 0.2.5.4-alpha.
- - Fix a clang warning about checking whether an address in the
- middle of a structure is NULL. Fixes bug 14001; bugfix
- on 0.2.1.2-alpha.
- - The address of an array in the middle of a structure will always
- be non-NULL. clang recognises this and complains. Disable the
- tautologous and redundant check to silence this warning. Fixes bug
- 14001; bugfix on 0.2.1.2-alpha.
- - Compile correctly with (unreleased) OpenSSL 1.1.0 headers.
- Addresses ticket 14188.
- - Build without warnings with the stock OpenSSL srtp.h header, which
- has a duplicate declaration of SSL_get_selected_srtp_profile().
- Fixes bug 14220; this is OpenSSL's bug, not ours.
- - Do not compile any code related to Tor2Web mode when Tor2Web mode
- is not enabled at compile time. Previously, this code was included
- in a disabled state. See discussion on ticket 12844.
- - Allow our configure script to build correctly with autoconf 2.62
- again. Fixes bug 12693; bugfix on 0.2.5.2-alpha.
- - Improve the error message from ./configure to make it clear that
- when asciidoc has not been found, the user will have to either add
- --disable-asciidoc argument or install asciidoc. Resolves
- ticket 13228.
- o Minor bugfixes (controller):
- - Report "down" in response to the "GETINFO entry-guards" command
- when relays are down with an unreachable_since value. Previously,
- we would report "up". Fixes bug 14184; bugfix on 0.1.2.2-alpha.
- - Avoid crashing on a malformed EXTENDCIRCUIT command. Fixes bug
- 14116; bugfix on 0.2.2.9-alpha.
- o Minor bugfixes (controller):
- - Return an error when the second or later arguments of the
- "setevents" controller command are invalid events. Previously we
- would return success while silently skipping invalid events. Fixes
- bug 13205; bugfix on 0.2.3.2-alpha. Reported by "fpxnns".
- o Minor bugfixes (directory authority):
- - Allow directory authorities to fetch more data from one another if
- they find themselves missing lots of votes. Previously, they had
- been bumping against the 10 MB queued data limit. Fixes bug 14261;
- bugfix on 0.1.2.5-alpha.
- - Do not attempt to download extrainfo documents which we will be
- unable to validate with a matching server descriptor. Fixes bug
- 13762; bugfix on 0.2.0.1-alpha.
- - Fix a bug that was truncating AUTHDIR_NEWDESC events sent to the
- control port. Fixes bug 14953; bugfix on 0.2.0.1-alpha.
- - Enlarge the buffer to read bwauth generated files to avoid an
- issue when parsing the file in dirserv_read_measured_bandwidths().
- Fixes bug 14125; bugfix on 0.2.2.1-alpha.
- - When running as a v3 directory authority, advertise that you serve
- extra-info documents so that clients who want them can find them
- from you too. Fixes part of bug 11683; bugfix on 0.2.0.1-alpha.
- o Minor bugfixes (directory system):
- - Always believe that v3 directory authorities serve extra-info
- documents, whether they advertise "caches-extra-info" or not.
- Fixes part of bug 11683; bugfix on 0.2.0.1-alpha.
- - Check the BRIDGE_DIRINFO flag bitwise rather than using equality.
- Previously, directories offering BRIDGE_DIRINFO and some other
- flag (i.e. microdescriptors or extrainfo) would be ignored when
- looking for bridges. Partially fixes bug 13163; bugfix
- on 0.2.0.7-alpha.
- o Minor bugfixes (file handling):
- - Stop failing when key files are zero-length. Instead, generate new
- keys, and overwrite the empty key files. Fixes bug 13111; bugfix
- on all versions of Tor. Patch by "teor".
- - Stop generating a fresh .old RSA onion key file when the .old file
- is missing. Fixes part of 13111; bugfix on 0.0.6rc1.
- - Avoid overwriting .old key files with empty key files.
- - Skip loading zero-length extrainfo store, router store, stats,
- state, and key files.
- - Avoid crashing when trying to reload a torrc specified as a
- relative path with RunAsDaemon turned on. Fixes bug 13397; bugfix
- on 0.2.3.11-alpha.
- o Minor bugfixes (hidden services):
- - Close the introduction circuit when we have no more usable intro
- points, instead of waiting for it to time out. This also ensures
- that no follow-up HS descriptor fetch is triggered when the
- circuit eventually times out. Fixes bug 14224; bugfix on 0.0.6.
- - When fetching a hidden service descriptor for a down service that
- was recently up, do not keep refetching until we try the same
- replica twice in a row. Fixes bug 14219; bugfix on 0.2.0.10-alpha.
- - Correctly send a controller event when we find that a rendezvous
- circuit has finished. Fixes bug 13936; bugfix on 0.1.1.5-alpha.
- - Pre-check directory permissions for new hidden-services to avoid
- at least one case of "Bug: Acting on config options left us in a
- broken state. Dying." Fixes bug 13942; bugfix on 0.0.6pre1.
- - When fetching hidden service descriptors, we now check not only
- for whether we got the hidden service we had in mind, but also
- whether we got the particular descriptors we wanted. This prevents
- a class of inefficient but annoying DoS attacks by hidden service
- directories. Fixes bug 13214; bugfix on 0.2.1.6-alpha. Reported
- by "special".
- o Minor bugfixes (Linux seccomp2 sandbox):
- - Make transparent proxy support work along with the seccomp2
- sandbox. Fixes part of bug 13808; bugfix on 0.2.5.1-alpha. Patch
- by Francisco Blas Izquierdo Riera.
- - Fix a memory leak in tor-resolve when running with the sandbox
- enabled. Fixes bug 14050; bugfix on 0.2.5.9-rc.
- - Allow glibc fatal errors to be sent to stderr before Tor exits.
- Previously, glibc would try to write them to /dev/tty, and the
- sandbox would trap the call and make Tor exit prematurely. Fixes
- bug 14759; bugfix on 0.2.5.1-alpha.
- o Minor bugfixes (logging):
- - Avoid crashing when there are more log domains than entries in
- domain_list. Bugfix on 0.2.3.1-alpha.
- - Downgrade warnings about RSA signature failures to info log level.
- Emit a warning when an extra info document is found incompatible
- with a corresponding router descriptor. Fixes bug 9812; bugfix
- on 0.0.6rc3.
- - Make connection_ap_handshake_attach_circuit() log the circuit ID
- correctly. Fixes bug 13701; bugfix on 0.0.6.
- o Minor bugfixes (networking):
- - Check for orconns and use connection_or_close_for_error() rather
- than connection_mark_for_close() directly in the getsockopt()
- failure case of connection_handle_write_impl(). Fixes bug 11302;
- bugfix on 0.2.4.4-alpha.
- o Minor bugfixes (parsing):
- - Stop accepting milliseconds (or other junk) at the end of
- descriptor publication times. Fixes bug 9286; bugfix on 0.0.2pre25.
- - Support two-number and three-number version numbers correctly, in
- case we change the Tor versioning system in the future. Fixes bug
- 13661; bugfix on 0.0.8pre1.
- o Minor bugfixes (portability):
- - Fix the ioctl()-based network interface lookup code so that it
- will work on systems that have variable-length struct ifreq, for
- example Mac OS X.
- - Use the correct datatype in the SipHash-2-4 function to prevent
- compilers from assuming any sort of alignment. Fixes bug 15436;
- bugfix on 0.2.5.3-alpha.
- o Minor bugfixes (preventative security, C safety):
- - When reading a hexadecimal, base-32, or base-64 encoded value from
- a string, always overwrite the whole output buffer. This prevents
- some bugs where we would look at (but fortunately, not reveal)
- uninitialized memory on the stack. Fixes bug 14013; bugfix on all
- versions of Tor.
- - Clear all memory targeted by tor_addr_{to,from}_sockaddr(), not
- just the part that's used. This makes it harder for data leak bugs
- to occur in the event of other programming failures. Resolves
- ticket 14041.
- o Minor bugfixes (relay):
- - When generating our family list, remove spaces from around the
- entries. Fixes bug 12728; bugfix on 0.2.1.7-alpha.
- - If our previous bandwidth estimate was 0 bytes, allow publishing a
- new relay descriptor immediately. Fixes bug 13000; bugfix
- on 0.1.1.6-alpha.
- o Minor bugfixes (shutdown):
- - When shutting down, always call event_del() on lingering read or
- write events before freeing them. Otherwise, we risk double-frees
- or read-after-frees in event_base_free(). Fixes bug 12985; bugfix
- on 0.1.0.2-rc.
- o Minor bugfixes (small memory leaks):
- - Avoid leaking memory when using IPv6 virtual address mappings.
- Fixes bug 14123; bugfix on 0.2.4.7-alpha. Patch by Tom van
- der Woerdt.
- o Minor bugfixes (statistics):
- - Increase period over which bandwidth observations are aggregated
- from 15 minutes to 4 hours. Fixes bug 13988; bugfix on 0.0.8pre1.
- o Minor bugfixes (systemd support):
- - Run correctly under systemd with the RunAsDaemon option set. Fixes
- part of bug 14141; bugfix on 0.2.5.7-rc. Patch from Tomasz Torcz.
- - Inform the systemd supervisor about more changes in the Tor
- process status. Implements part of ticket 14141. Patch from
- Tomasz Torcz.
- o Minor bugfixes (testing networks):
- - Fix TestingDirAuthVoteGuard to properly give out Guard flags in a
- testing network. Fixes bug 13064; bugfix on 0.2.5.2-alpha.
- - Stop using the default authorities in networks which provide both
- AlternateDirAuthority and AlternateBridgeAuthority. Partially
- fixes bug 13163; bugfix on 0.2.0.13-alpha.
- o Minor bugfixes (testing networks, fast startup):
- - Allow Tor to build circuits using a consensus with no exits. If
- the consensus has no exits (typical of a bootstrapping test
- network), allow Tor to build circuits once enough descriptors have
- been downloaded. This assists in bootstrapping a testing Tor
- network. Fixes bug 13718; bugfix on 0.2.4.10-alpha. Patch
- by "teor".
- - When V3AuthVotingInterval is low, give a lower If-Modified-Since
- header to directory servers. This allows us to obtain consensuses
- promptly when the consensus interval is very short. This assists
- in bootstrapping a testing Tor network. Fixes parts of bugs 13718
- and 13963; bugfix on 0.2.0.3-alpha. Patch by "teor".
- - Stop assuming that private addresses are local when checking
- reachability in a TestingTorNetwork. Instead, when testing, assume
- all OR connections are remote. (This is necessary due to many test
- scenarios running all relays on localhost.) This assists in
- bootstrapping a testing Tor network. Fixes bug 13924; bugfix on
- 0.1.0.1-rc. Patch by "teor".
- - Avoid building exit circuits from a consensus with no exits. Now
- thanks to our fix for 13718, we accept a no-exit network as not
- wholly lost, but we need to remember not to try to build exit
- circuits on it. Closes ticket 13814; patch by "teor".
- - Stop requiring exits to have non-zero bandwithcapacity in a
- TestingTorNetwork. Instead, when TestingMinExitFlagThreshold is 0,
- ignore exit bandwidthcapacity. This assists in bootstrapping a
- testing Tor network. Fixes parts of bugs 13718 and 13839; bugfix
- on 0.2.0.3-alpha. Patch by "teor".
- - Add "internal" to some bootstrap statuses when no exits are
- available. If the consensus does not contain Exits, Tor will only
- build internal circuits. In this case, relevant statuses will
- contain the word "internal" as indicated in the Tor control-
- spec.txt. When bootstrap completes, Tor will be ready to build
- internal circuits. If a future consensus contains Exits, exit
- circuits may become available. Fixes part of bug 13718; bugfix on
- 0.2.4.10-alpha. Patch by "teor".
- - Decrease minimum consensus interval to 10 seconds when
- TestingTorNetwork is set, or 5 seconds for the first consensus.
- Fix assumptions throughout the code that assume larger intervals.
- Fixes bugs 13718 and 13823; bugfix on 0.2.0.3-alpha. Patch
- by "teor".
- - Avoid excluding guards from path building in minimal test
- networks, when we're in a test network and excluding guards would
- exclude all relays. This typically occurs in incredibly small tor
- networks, and those using "TestingAuthVoteGuard *". Fixes part of
- bug 13718; bugfix on 0.1.1.11-alpha. Patch by "teor".
- o Minor bugfixes (testing):
- - Avoid a side-effect in a tor_assert() in the unit tests. Fixes bug
- 15188; bugfix on 0.1.2.3-alpha. Patch from Tom van der Woerdt.
- - Stop spawn test failures due to a race condition between the
- SIGCHLD handler updating the process status, and the test reading
- it. Fixes bug 13291; bugfix on 0.2.3.3-alpha.
- - Avoid passing an extra backslash when creating a temporary
- directory for running the unit tests on Windows. Fixes bug 12392;
- bugfix on 0.2.2.25-alpha. Patch from Gisle Vanem.
- o Minor bugfixes (TLS):
- - Check more thoroughly throughout the TLS code for possible
- unlogged TLS errors. Possible diagnostic or fix for bug 13319.
- o Minor bugfixes (transparent proxy):
- - Use getsockname, not getsockopt, to retrieve the address for a
- TPROXY-redirected connection. Fixes bug 13796; bugfix
- on 0.2.5.2-alpha.
- o Minor bugfixes (windows):
- - Remove code to special-case handling of NTE_BAD_KEYSET when
- acquiring windows CryptoAPI context. This error can't actually
- occur for the parameters we're providing. Fixes bug 10816; bugfix
- on 0.0.2pre26.
- o Minor bugfixes (zlib):
- - Avoid truncating a zlib stream when trying to finalize it with an
- empty output buffer. Fixes bug 11824; bugfix on 0.1.1.23.
- o Code simplification and refactoring:
- - Change the entry_is_live() function to take named bitfield
- elements instead of an unnamed list of booleans. Closes
- ticket 12202.
- - Refactor and unit-test entry_is_time_to_retry() in entrynodes.c.
- Resolves ticket 12205.
- - Use calloc and reallocarray functions instead of multiply-
- then-malloc. This makes it less likely for us to fall victim to an
- integer overflow attack when allocating. Resolves ticket 12855.
- - Use the standard macro name SIZE_MAX, instead of our
- own SIZE_T_MAX.
- - Document usage of the NO_DIRINFO and ALL_DIRINFO flags clearly in
- functions which take them as arguments. Replace 0 with NO_DIRINFO
- in a function call for clarity. Seeks to prevent future issues
- like 13163.
- - Avoid 4 null pointer errors under clang static analysis by using
- tor_assert() to prove that the pointers aren't null. Fixes
- bug 13284.
- - Rework the API of policies_parse_exit_policy() to use a bitmask to
- represent parsing options, instead of a confusing mess of
- booleans. Resolves ticket 8197.
- - Introduce a helper function to parse ExitPolicy in
- or_options_t structure.
- - Move fields related to isolating and configuring client ports into
- a shared structure. Previously, they were duplicated across
- port_cfg_t, listener_connection_t, and edge_connection_t. Failure
- to copy them correctly had been the cause of at least one bug in
- the past. Closes ticket 8546.
- - Refactor the get_interface_addresses_raw() doom-function into
- multiple smaller and simpler subfunctions. Cover the resulting
- subfunctions with unit-tests. Fixes a significant portion of
- issue 12376.
- - Remove workaround in dirserv_thinks_router_is_hs_dir() that was
- only for version <= 0.2.2.24 which is now deprecated. Closes
- ticket 14202.
- - Remove a test for a long-defunct broken version-one
- directory server.
- - Refactor main loop to extract the 'loop' part. This makes it
- easier to run Tor under Shadow. Closes ticket 15176.
- - Stop using can_complete_circuits as a global variable; access it
- with a function instead.
- - Avoid using operators directly as macro arguments: this lets us
- apply coccinelle transformations to our codebase more directly.
- Closes ticket 13172.
- - Combine the functions used to parse ClientTransportPlugin and
- ServerTransportPlugin into a single function. Closes ticket 6456.
- - Add inline functions and convenience macros for inspecting channel
- state. Refactor the code to use convenience macros instead of
- checking channel state directly. Fixes issue 7356.
- - Document all members of was_router_added_t and rename
- ROUTER_WAS_NOT_NEW to ROUTER_IS_ALREADY_KNOWN to make it less
- confusable with ROUTER_WAS_TOO_OLD. Fixes issue 13644.
- - In connection_exit_begin_conn(), use END_CIRC_REASON_TORPROTOCOL
- constant instead of hardcoded value. Fixes issue 13840.
- - Refactor our generic strmap and digestmap types into a single
- implementation, so that we can add a new digest256map
- type trivially.
- o Documentation:
- - Add a doc/TUNING document with tips for handling large numbers of
- TCP connections when running busy Tor relay. Update the warning
- message to point to this file when running out of sockets
- operating system is allowing to use simultaneously. Resolves
- ticket 9708.
- - Adding section on OpenBSD to our TUNING document. Thanks to mmcc
- for writing the OpenBSD-specific tips. Resolves ticket 13702.
- - Make the tor-resolve documentation match its help string and its
- options. Resolves part of ticket 14325.
- - Log a more useful error message from tor-resolve when failing to
- look up a hidden service address. Resolves part of ticket 14325.
- - Document the bridge-authority-only 'networkstatus-bridges' file.
- Closes ticket 13713; patch from "tom".
- - Fix typo in PredictedPortsRelevanceTime option description in
- manpage. Resolves issue 13707.
- - Stop suggesting that users specify relays by nickname: it isn't a
- good idea. Also, properly cross-reference how to specify relays in
- all parts of manual documenting options that take a list of
- relays. Closes ticket 13381.
- - Clarify the HiddenServiceDir option description in manpage to make
- it clear that relative paths are taken with respect to the current
- working directory. Also clarify that this behavior is not
- guaranteed to remain indefinitely. Fixes issue 13913.
- o Distribution (systemd):
- - systemd unit file: only allow tor to write to /var/lib/tor and
- /var/log/tor. The rest of the filesystem is accessible for reading
- only. Patch by intrigeri; resolves ticket 12751.
- - systemd unit file: ensure that the process and all its children
- can never gain new privileges. Patch by intrigeri; resolves
- ticket 12939.
- - systemd unit file: set up /var/run/tor as writable for the Tor
- service. Patch by intrigeri; resolves ticket 13196.
- o Downgraded warnings:
- - Don't warn when we've attempted to contact a relay using the wrong
- ntor onion key. Closes ticket 9635.
- o Removed code:
- - Remove some lingering dead code that once supported mempools.
- Mempools were disabled by default in 0.2.5, and removed entirely
- in 0.2.6.3-alpha. Closes more of ticket 14848; patch
- by "cypherpunks".
- o Removed features (directory authorities):
- - Remove code that prevented authorities from listing Tor relays
- affected by CVE-2011-2769 as guards. These relays are already
- rejected altogether due to the minimum version requirement of
- 0.2.3.16-alpha. Closes ticket 13152.
- - The "AuthDirRejectUnlisted" option no longer has any effect, as
- the fingerprints file (approved-routers) has been deprecated.
- - Directory authorities do not support being Naming dirauths anymore.
- The "NamingAuthoritativeDir" config option is now obsolete.
- - Directory authorities do not support giving out the BadDirectory
- flag anymore.
- - Directory authorities no longer advertise or support consensus
- methods 1 through 12 inclusive. These consensus methods were
- obsolete and/or insecure: maintaining the ability to support them
- served no good purpose. Implements part of proposal 215; closes
- ticket 10163.
- o Removed features:
- - To avoid confusion with the "ExitRelay" option, "ExitNode" is no
- longer silently accepted as an alias for "ExitNodes".
- - The --enable-mempool and --enable-buf-freelists options, which
- were originally created to work around bad malloc implementations,
- no longer exist. They were off-by-default in 0.2.5. Closes
- ticket 14848.
- - We no longer remind the user about configuration options that have
- been obsolete since 0.2.3.x or earlier. Patch by Adrien Bak.
- - Remove our old, non-weighted bandwidth-based node selection code.
- Previously, we used it as a fallback when we couldn't perform
- weighted bandwidth-based node selection. But that would only
- happen in the cases where we had no consensus, or when we had a
- consensus generated by buggy or ancient directory authorities. In
- either case, it's better to use the more modern, better maintained
- algorithm, with reasonable defaults for the weights. Closes
- ticket 13126.
- - Remove the --disable-curve25519 configure option. Relays and
- clients now are required to support curve25519 and the
- ntor handshake.
- - The old "StrictEntryNodes" and "StrictExitNodes" options, which
- used to be deprecated synonyms for "StrictNodes", are now marked
- obsolete. Resolves ticket 12226.
- - Clients don't understand the BadDirectory flag in the consensus
- anymore, and ignore it.
- o Removed platform support:
- - We no longer include special code to build on Windows CE; as far
- as we know, nobody has used Tor on Windows CE in a very long time.
- Closes ticket 11446.
- o Testing (test-network.sh):
- - Stop using "echo -n", as some shells' built-in echo doesn't
- support "-n". Instead, use "/bin/echo -n". Partially fixes
- bug 13161.
- - Stop an apparent test-network hang when used with make -j2. Fixes
- bug 13331.
- - Add a --delay option to test-network.sh, which configures the
- delay before the chutney network tests for data transmission.
- Partially implements ticket 13161.
- o Testing:
- - Test that tor does not fail when key files are zero-length. Check
- that tor generates new keys, and overwrites the empty key files.
- - Test that tor generates new keys when keys are missing
- (existing behavior).
- - Test that tor does not overwrite key files that already contain
- data (existing behavior). Tests bug 13111. Patch by "teor".
- - New "make test-stem" target to run stem integration tests.
- Requires that the "STEM_SOURCE_DIR" environment variable be set.
- Closes ticket 14107.
- - Make the test_cmdline_args.py script work correctly on Windows.
- Patch from Gisle Vanem.
- - Move the slower unit tests into a new "./src/test/test-slow"
- binary that can be run independently of the other tests. Closes
- ticket 13243.
- - New tests for many parts of channel, relay, and circuitmux
- functionality. Code by Andrea; part of 9262.
- - New tests for parse_transport_line(). Part of ticket 6456.
- - In the unit tests, use chgrp() to change the group of the unit
- test temporary directory to the current user, so that the sticky
- bit doesn't interfere with tests that check directory groups.
- Closes 13678.
- - Add unit tests for resolve_my_addr(). Part of ticket 12376; patch
- by 'rl1987'.
- - Refactor the function that chooses guard nodes so that it can more
- easily be tested; write some tests for it.
- - Fix and re-enable the fgets_eagain unit test. Fixes bug 12503;
- bugfix on 0.2.3.1-alpha. Patch from "cypherpunks."
- - Create unit tests for format_time_interval(). With bug 13393.
- - Add unit tests for tor_timegm signed overflow, tor_timegm and
- parse_rfc1123_time validity checks, correct_tm year clamping. Unit
- tests (visible) fixes in bug 13476.
- - Add a "coverage-html" make target to generate HTML-visualized
- coverage results when building with --enable-coverage. (Requires
- lcov.) Patch from Kevin Murray.
- - Enable the backtrace handler (where supported) when running the
- unit tests.
- - Revise all unit tests that used the legacy test_* macros to
- instead use the recommended tt_* macros. This patch was generated
- with coccinelle, to avoid manual errors. Closes ticket 13119.
- Changes in version 0.2.5.11 - 2015-03-17
- Tor 0.2.5.11 is the second stable release in the 0.2.5 series.
- It backports several bugfixes from the 0.2.6 branch, including a
- couple of medium-level security fixes for relays and exit nodes.
- It also updates the list of directory authorities.
- o Directory authority changes:
- - Remove turtles as a directory authority.
- - Add longclaw as a new (v3) directory authority. This implements
- ticket 13296. This keeps the directory authority count at 9.
- - The directory authority Faravahar has a new IP address. This
- closes ticket 14487.
- o Major bugfixes (crash, OSX, security):
- - Fix a remote denial-of-service opportunity caused by a bug in
- OSX's _strlcat_chk() function. Fixes bug 15205; bug first appeared
- in OSX 10.9.
- o Major bugfixes (relay, stability, possible security):
- - Fix a bug that could lead to a relay crashing with an assertion
- failure if a buffer of exactly the wrong layout was passed to
- buf_pullup() at exactly the wrong time. Fixes bug 15083; bugfix on
- 0.2.0.10-alpha. Patch from 'cypherpunks'.
- - Do not assert if the 'data' pointer on a buffer is advanced to the
- very end of the buffer; log a BUG message instead. Only assert if
- it is past that point. Fixes bug 15083; bugfix on 0.2.0.10-alpha.
- o Major bugfixes (exit node stability):
- - Fix an assertion failure that could occur under high DNS load.
- Fixes bug 14129; bugfix on Tor 0.0.7rc1. Found by "jowr";
- diagnosed and fixed by "cypherpunks".
- o Major bugfixes (Linux seccomp2 sandbox):
- - Upon receiving sighup with the seccomp2 sandbox enabled, do not
- crash during attempts to call wait4. Fixes bug 15088; bugfix on
- 0.2.5.1-alpha. Patch from "sanic".
- o Minor features (controller):
- - New "GETINFO bw-event-cache" to get information about recent
- bandwidth events. Closes ticket 14128. Useful for controllers to
- get recent bandwidth history after the fix for ticket 13988.
- o Minor features (geoip):
- - Update geoip to the March 3 2015 Maxmind GeoLite2 Country database.
- - Update geoip6 to the March 3 2015 Maxmind GeoLite2
- Country database.
- o Minor bugfixes (client, automapping):
- - Avoid crashing on torrc lines for VirtualAddrNetworkIPv[4|6] when
- no value follows the option. Fixes bug 14142; bugfix on
- 0.2.4.7-alpha. Patch by "teor".
- - Fix a memory leak when using AutomapHostsOnResolve. Fixes bug
- 14195; bugfix on 0.1.0.1-rc.
- o Minor bugfixes (compilation):
- - Build without warnings with the stock OpenSSL srtp.h header, which
- has a duplicate declaration of SSL_get_selected_srtp_profile().
- Fixes bug 14220; this is OpenSSL's bug, not ours.
- o Minor bugfixes (directory authority):
- - Allow directory authorities to fetch more data from one another if
- they find themselves missing lots of votes. Previously, they had
- been bumping against the 10 MB queued data limit. Fixes bug 14261;
- bugfix on 0.1.2.5-alpha.
- - Enlarge the buffer to read bwauth generated files to avoid an
- issue when parsing the file in dirserv_read_measured_bandwidths().
- Fixes bug 14125; bugfix on 0.2.2.1-alpha.
- o Minor bugfixes (statistics):
- - Increase period over which bandwidth observations are aggregated
- from 15 minutes to 4 hours. Fixes bug 13988; bugfix on 0.0.8pre1.
- o Minor bugfixes (preventative security, C safety):
- - When reading a hexadecimal, base-32, or base-64 encoded value from
- a string, always overwrite the whole output buffer. This prevents
- some bugs where we would look at (but fortunately, not reveal)
- uninitialized memory on the stack. Fixes bug 14013; bugfix on all
- versions of Tor.
- Changes in version 0.2.4.26 - 2015-03-17
- Tor 0.2.4.26 includes an updated list of directory authorities. It
- also backports a couple of stability and security bugfixes from 0.2.5
- and beyond.
- o Directory authority changes:
- - Remove turtles as a directory authority.
- - Add longclaw as a new (v3) directory authority. This implements
- ticket 13296. This keeps the directory authority count at 9.
- - The directory authority Faravahar has a new IP address. This
- closes ticket 14487.
- o Major bugfixes (exit node stability, also in 0.2.6.3-alpha):
- - Fix an assertion failure that could occur under high DNS load.
- Fixes bug 14129; bugfix on Tor 0.0.7rc1. Found by "jowr";
- diagnosed and fixed by "cypherpunks".
- o Major bugfixes (relay, stability, possible security, also in 0.2.6.4-rc):
- - Fix a bug that could lead to a relay crashing with an assertion
- failure if a buffer of exactly the wrong layout was passed to
- buf_pullup() at exactly the wrong time. Fixes bug 15083; bugfix on
- 0.2.0.10-alpha. Patch from 'cypherpunks'.
- - Do not assert if the 'data' pointer on a buffer is advanced to the
- very end of the buffer; log a BUG message instead. Only assert if
- it is past that point. Fixes bug 15083; bugfix on 0.2.0.10-alpha.
- o Minor features (geoip):
- - Update geoip to the March 3 2015 Maxmind GeoLite2 Country database.
- - Update geoip6 to the March 3 2015 Maxmind GeoLite2
- Country database.
- Changes in version 0.2.5.10 - 2014-10-24
- Tor 0.2.5.10 is the first stable release in the 0.2.5 series.
- It adds several new security features, including improved
- denial-of-service resistance for relays, new compiler hardening
- options, and a system-call sandbox for hardened installations on Linux
- (requires seccomp2). The controller protocol has several new features,
- resolving IPv6 addresses should work better than before, and relays
- should be a little more CPU-efficient. We've added support for more
- OpenBSD and FreeBSD transparent proxy types. We've improved the build
- system and testing infrastructure to allow unit testing of more parts
- of the Tor codebase. Finally, we've addressed several nagging pluggable
- transport usability issues, and included numerous other small bugfixes
- and features mentioned below.
- This release marks end-of-life for Tor 0.2.3.x; those Tor versions
- have accumulated many known flaws; everyone should upgrade.
- o Major features (security):
- - The ntor handshake is now on-by-default, no matter what the
- directory authorities recommend. Implements ticket 8561.
- - Make the "tor-gencert" tool used by directory authority operators
- create 2048-bit signing keys by default (rather than 1024-bit, since
- 1024-bit is uncomfortably small these days). Addresses ticket 10324.
- - Warn about attempts to run hidden services and relays in the same
- process: that's probably not a good idea. Closes ticket 12908.
- - Disable support for SSLv3. All versions of OpenSSL in use with Tor
- today support TLS 1.0 or later, so we can safely turn off support
- for this old (and insecure) protocol. Fixes bug 13426.
- o Major features (relay security, DoS-resistance):
- - When deciding whether we have run out of memory and we need to
- close circuits, also consider memory allocated in buffers for
- streams attached to each circuit.
- This change, which extends an anti-DoS feature introduced in
- 0.2.4.13-alpha and improved in 0.2.4.14-alpha, lets Tor exit relays
- better resist more memory-based DoS attacks than before. Since the
- MaxMemInCellQueues option now applies to all queues, it is renamed
- to MaxMemInQueues. This feature fixes bug 10169.
- - Avoid hash-flooding denial-of-service attacks by using the secure
- SipHash-2-4 hash function for our hashtables. Without this
- feature, an attacker could degrade performance of a targeted
- client or server by flooding their data structures with a large
- number of entries to be stored at the same hash table position,
- thereby slowing down the Tor instance. With this feature, hash
- table positions are derived from a randomized cryptographic key,
- and an attacker cannot predict which entries will collide. Closes
- ticket 4900.
- - If you don't specify MaxMemInQueues yourself, Tor now tries to
- pick a good value based on your total system memory. Previously,
- the default was always 8 GB. You can still override the default by
- setting MaxMemInQueues yourself. Resolves ticket 11396.
- o Major features (bridges and pluggable transports):
- - Add support for passing arguments to managed pluggable transport
- proxies. Implements ticket 3594.
- - Bridges now track GeoIP information and the number of their users
- even when pluggable transports are in use, and report usage
- statistics in their extra-info descriptors. Resolves tickets 4773
- and 5040.
- - Don't launch pluggable transport proxies if we don't have any
- bridges configured that would use them. Now we can list many
- pluggable transports, and Tor will dynamically start one when it
- hears a bridge address that needs it. Resolves ticket 5018.
- - The bridge directory authority now assigns status flags (Stable,
- Guard, etc) to bridges based on thresholds calculated over all
- Running bridges. Now bridgedb can finally make use of its features
- to e.g. include at least one Stable bridge in its answers. Fixes
- bug 9859.
- o Major features (controller):
- - Extend ORCONN controller event to include an "ID" parameter,
- and add four new controller event types CONN_BW, CIRC_BW,
- CELL_STATS, and TB_EMPTY that show connection and circuit usage.
- The new events are emitted in private Tor networks only, with the
- goal of being able to better track performance and load during
- full-network simulations. Implements proposal 218 and ticket 7359.
- o Major features (relay performance):
- - Speed up server-side lookups of rendezvous and introduction point
- circuits by using hashtables instead of linear searches. These
- functions previously accounted between 3 and 7% of CPU usage on
- some busy relays. Resolves ticket 9841.
- - Avoid wasting CPU when extending a circuit over a channel that is
- nearly out of circuit IDs. Previously, we would do a linear scan
- over possible circuit IDs before finding one or deciding that we
- had exhausted our possibilities. Now, we try at most 64 random
- circuit IDs before deciding that we probably won't succeed. Fixes
- a possible root cause of ticket 11553.
- o Major features (seccomp2 sandbox, Linux only):
- - Use the seccomp2 syscall filtering facility on Linux to limit
- which system calls Tor can invoke. This is an experimental,
- Linux-only feature to provide defense-in-depth against unknown
- attacks. To try turning it on, set "Sandbox 1" in your torrc
- file. Please be ready to report bugs. We hope to add support
- for better sandboxing in the future, including more fine-grained
- filters, better division of responsibility, and support for more
- platforms. This work has been done by Cristian-Matei Toader for
- Google Summer of Code. Resolves tickets 11351 and 11465.
- o Major features (testing networks):
- - Make testing Tor networks bootstrap better: lower directory fetch
- retry schedules and maximum interval without directory requests,
- and raise maximum download tries. Implements ticket 6752.
- - Add make target 'test-network' to run tests on a Chutney network.
- Implements ticket 8530.
- o Major features (other):
- - On some platforms (currently: recent OSX versions, glibc-based
- platforms that support the ELF format, and a few other
- Unix-like operating systems), Tor can now dump stack traces
- when a crash occurs or an assertion fails. By default, traces
- are dumped to stderr (if possible) and to any logs that are
- reporting errors. Implements ticket 9299.
- o Deprecated versions:
- - Tor 0.2.3.x has reached end-of-life; it has received no patches or
- attention for some while.
- o Major bugfixes (security, directory authorities):
- - Directory authorities now include a digest of each relay's
- identity key as a part of its microdescriptor.
- This is a workaround for bug 11743 (reported by "cypherpunks"),
- where Tor clients do not support receiving multiple
- microdescriptors with the same SHA256 digest in the same
- consensus. When clients receive a consensus like this, they only
- use one of the relays. Without this fix, a hostile relay could
- selectively disable some client use of target relays by
- constructing a router descriptor with a different identity and the
- same microdescriptor parameters and getting the authorities to
- list it in a microdescriptor consensus. This fix prevents an
- attacker from causing a microdescriptor collision, because the
- router's identity is not forgeable.
- o Major bugfixes (openssl bug workaround):
- - Avoid crashing when using OpenSSL version 0.9.8zc, 1.0.0o, or
- 1.0.1j, built with the 'no-ssl3' configuration option. Fixes
- bug 13471. This is a workaround for an OpenSSL bug.
- o Major bugfixes (client):
- - Perform circuit cleanup operations even when circuit
- construction operations are disabled (because the network is
- disabled, or because there isn't enough directory information).
- Previously, when we were not building predictive circuits, we
- were not closing expired circuits either. Fixes bug 8387; bugfix on
- 0.1.1.11-alpha. This bug became visible in 0.2.4.10-alpha when we
- became more strict about when we have "enough directory information
- to build circuits".
- o Major bugfixes (client, pluggable transports):
- - When managing pluggable transports, use OS notification facilities
- to learn if they have crashed, and don't attempt to kill any
- process that has already exited. Fixes bug 8746; bugfix
- on 0.2.3.6-alpha.
- o Major bugfixes (relay denial of service):
- - Instead of writing destroy cells directly to outgoing connection
- buffers, queue them and intersperse them with other outgoing cells.
- This can prevent a set of resource starvation conditions where too
- many pending destroy cells prevent data cells from actually getting
- delivered. Reported by "oftc_must_be_destroyed". Fixes bug 7912;
- bugfix on 0.2.0.1-alpha.
- o Major bugfixes (relay):
- - Avoid queuing or sending destroy cells for circuit ID zero when we
- fail to send a CREATE cell. Fixes bug 12848; bugfix on 0.0.8pre1.
- Found and fixed by "cypherpunks".
- - Fix ORPort reachability detection on relays running behind a
- proxy, by correctly updating the "local" mark on the controlling
- channel when changing the address of an or_connection_t after the
- handshake. Fixes bug 12160; bugfix on 0.2.4.4-alpha.
- - Use a direct dirport connection when uploading non-anonymous
- descriptors to the directory authorities. Previously, relays would
- incorrectly use tunnel connections under a fairly wide variety of
- circumstances. Fixes bug 11469; bugfix on 0.2.4.3-alpha.
- - When a circuit accidentally has the same circuit ID for its
- forward and reverse direction, correctly detect the direction of
- cells using that circuit. Previously, this bug made roughly one
- circuit in a million non-functional. Fixes bug 12195; this is a
- bugfix on every version of Tor.
- o Minor features (security):
- - New --enable-expensive-hardening option to enable security
- hardening options that consume nontrivial amounts of CPU and
- memory. Right now, this includes AddressSanitizer and UbSan, which
- are supported in newer versions of GCC and Clang. Closes ticket
- 11477.
- - Authorities now assign the Guard flag to the fastest 25% of the
- network (it used to be the fastest 50%). Also raise the consensus
- weight that guarantees the Guard flag from 250 to 2000. For the
- current network, this results in about 1100 guards, down from 2500.
- This step paves the way for moving the number of entry guards
- down to 1 (proposal 236) while still providing reasonable expected
- performance for most users. Implements ticket 12690.
- o Minor features (security, memory management):
- - Memory allocation tricks (mempools and buffer freelists) are now
- disabled by default. You can turn them back on with
- --enable-mempools and --enable-buf-freelists respectively. We're
- disabling these features because malloc performance is good enough
- on most platforms, and a similar feature in OpenSSL exacerbated
- exploitation of the Heartbleed attack. Resolves ticket 11476.
- o Minor features (bridge client):
- - Report a more useful failure message when we can't connect to a
- bridge because we don't have the right pluggable transport
- configured. Resolves ticket 9665. Patch from Fábio J. Bertinatto.
- o Minor features (bridge):
- - Add an ExtORPortCookieAuthFileGroupReadable option to make the
- cookie file for the ExtORPort g+r by default.
- o Minor features (bridges, pluggable transports):
- - Bridges now write the SHA1 digest of their identity key
- fingerprint (that is, a hash of a hash of their public key) to
- notice-level logs, and to a new hashed-fingerprint file. This
- information will help bridge operators look up their bridge in
- Globe and similar tools. Resolves ticket 10884.
- - Improve the message that Tor displays when running as a bridge
- using pluggable transports without an Extended ORPort listener.
- Also, log the message in the log file too. Resolves ticket 11043.
- - Add threshold cutoffs to the networkstatus document created by
- the Bridge Authority. Fixes bug 1117.
- - On Windows, spawn background processes using the CREATE_NO_WINDOW
- flag. Now Tor Browser Bundle 3.5 with pluggable transports enabled
- doesn't pop up a blank console window. (In Tor Browser Bundle 2.x,
- Vidalia set this option for us.) Implements ticket 10297.
- o Minor features (build):
- - The configure script has a --disable-seccomp option to turn off
- support for libseccomp on systems that have it, in case it (or
- Tor's use of it) is broken. Resolves ticket 11628.
- - Assume that a user using ./configure --host wants to cross-compile,
- and give an error if we cannot find a properly named
- tool-chain. Add a --disable-tool-name-check option to proceed
- nevertheless. Addresses ticket 9869. Patch by Benedikt Gollatz.
- - If we run ./configure and the compiler recognizes -fstack-protector
- but the linker rejects it, warn the user about a potentially missing
- libssp package. Addresses ticket 9948. Patch from Benedikt Gollatz.
- - Add support for `--library-versions` flag. Implements ticket 6384.
- - Return the "unexpected sendme" warnings to a warn severity, but make
- them rate limited, to help diagnose ticket 8093.
- - Detect a missing asciidoc, and warn the user about it, during
- configure rather than at build time. Fixes issue 6506. Patch from
- Arlo Breault.
- o Minor features (client):
- - Add a new option, PredictedPortsRelevanceTime, to control how long
- after having received a request to connect to a given port Tor
- will try to keep circuits ready in anticipation of future requests
- for that port. Patch from "unixninja92"; implements ticket 9176.
- o Minor features (config options and command line):
- - Add an --allow-missing-torrc commandline option that tells Tor to
- run even if the configuration file specified by -f is not available.
- Implements ticket 10060.
- - Add support for the TPROXY transparent proxying facility on Linux.
- See documentation for the new TransProxyType option for more
- details. Implementation by "thomo". Closes ticket 10582.
- o Minor features (config options):
- - Config (torrc) lines now handle fingerprints which are missing
- their initial '$'. Resolves ticket 4341; improvement over 0.0.9pre5.
- - Support a --dump-config option to print some or all of the
- configured options. Mainly useful for debugging the command-line
- option parsing code. Helps resolve ticket 4647.
- - Raise awareness of safer logging: notify user of potentially
- unsafe config options, like logging more verbosely than severity
- "notice" or setting SafeLogging to 0. Resolves ticket 5584.
- - Add a new configuration option TestingV3AuthVotingStartOffset
- that bootstraps a network faster by changing the timing for
- consensus votes. Addresses ticket 8532.
- - Add a new torrc option "ServerTransportOptions" that allows
- bridge operators to pass configuration parameters to their
- pluggable transports. Resolves ticket 8929.
- - The config (torrc) file now accepts bandwidth and space limits in
- bits as well as bytes. (Anywhere that you can say "2 Kilobytes",
- you can now say "16 kilobits", and so on.) Resolves ticket 9214.
- Patch by CharlieB.
- o Minor features (controller):
- - Make the entire exit policy available from the control port via
- GETINFO exit-policy/*. Implements enhancement 7952. Patch from
- "rl1987".
- - Because of the fix for ticket 11396, the real limit for memory
- usage may no longer match the configured MaxMemInQueues value. The
- real limit is now exposed via GETINFO limits/max-mem-in-queues.
- - Add a new "HS_DESC" controller event that reports activities
- related to hidden service descriptors. Resolves ticket 8510.
- - New "DROPGUARDS" controller command to forget all current entry
- guards. Not recommended for ordinary use, since replacing guards
- too frequently makes several attacks easier. Resolves ticket 9934;
- patch from "ra".
- - Implement the TRANSPORT_LAUNCHED control port event that
- notifies controllers about new launched pluggable
- transports. Resolves ticket 5609.
- o Minor features (diagnostic):
- - When logging a warning because of bug 7164, additionally check the
- hash table for consistency (as proposed on ticket 11737). This may
- help diagnose bug 7164.
- - When we log a heartbeat, log how many one-hop circuits we have
- that are at least 30 minutes old, and log status information about
- a few of them. This is an attempt to track down bug 8387.
- - When encountering an unexpected CR while writing text to a file on
- Windows, log the name of the file. Should help diagnosing
- bug 11233.
- - Give more specific warnings when a client notices that an onion
- handshake has failed. Fixes ticket 9635.
- - Add significant new logging code to attempt to diagnose bug 12184,
- where relays seem to run out of available circuit IDs.
- - Improve the diagnostic log message for bug 8387 even further to
- try to improve our odds of figuring out why one-hop directory
- circuits sometimes do not get closed.
- - Add more log messages to diagnose bug 7164, which causes
- intermittent "microdesc_free() called but md was still referenced"
- warnings. We now include more information, to figure out why we
- might be cleaning a microdescriptor for being too old if it's
- still referenced by a live node_t object.
- - Log current accounting state (bytes sent and received + remaining
- time for the current accounting period) in the relay's heartbeat
- message. Implements ticket 5526; patch from Peter Retzlaff.
- o Minor features (geoip):
- - Update geoip and geoip6 to the August 7 2014 Maxmind GeoLite2
- Country database.
- o Minor features (interface):
- - Generate a warning if any ports are listed in the SocksPolicy,
- DirPolicy, AuthDirReject, AuthDirInvalid, AuthDirBadDir, or
- AuthDirBadExit options. (These options only support address
- ranges.) Fixes part of ticket 11108.
- o Minor features (kernel API usage):
- - Use the SOCK_NONBLOCK socket type, if supported, to open nonblocking
- sockets in a single system call. Implements ticket 5129.
- o Minor features (log messages):
- - When ServerTransportPlugin is set on a bridge, Tor can write more
- useful statistics about bridge use in its extrainfo descriptors,
- but only if the Extended ORPort ("ExtORPort") is set too. Add a
- log message to inform the user in this case. Resolves ticket 9651.
- - When receiving a new controller connection, log the origin address.
- Resolves ticket 9698; patch from "sigpipe".
- - When logging OpenSSL engine status at startup, log the status of
- more engines. Fixes ticket 10043; patch from Joshua Datko.
- o Minor features (log verbosity):
- - Demote the message that we give when a flushing connection times
- out for too long from NOTICE to INFO. It was usually meaningless.
- Resolves ticket 5286.
- - Don't log so many notice-level bootstrapping messages at startup
- about downloading descriptors. Previously, we'd log a notice
- whenever we learned about more routers. Now, we only log a notice
- at every 5% of progress. Fixes bug 9963.
- - Warn less verbosely when receiving a malformed
- ESTABLISH_RENDEZVOUS cell. Fixes ticket 11279.
- o Minor features (performance):
- - If we're using the pure-C 32-bit curve25519_donna implementation
- of curve25519, build it with the -fomit-frame-pointer option to
- make it go faster on register-starved hosts. This improves our
- handshake performance by about 6% on i386 hosts without nacl.
- Closes ticket 8109.
- o Minor features (relay):
- - If a circuit timed out for at least 3 minutes, check if we have a
- new external IP address, and publish a new descriptor with the new
- IP address if it changed. Resolves ticket 2454.
- o Minor features (testing):
- - If Python is installed, "make check" now runs extra tests beyond
- the unit test scripts.
- - When bootstrapping a test network, sometimes very few relays get
- the Guard flag. Now a new option "TestingDirAuthVoteGuard" can
- specify a set of relays which should be voted Guard regardless of
- their uptime or bandwidth. Addresses ticket 9206.
- o Minor features (transparent proxy, *BSD):
- - Support FreeBSD's ipfw firewall interface for TransPort ports on
- FreeBSD. To enable it, set "TransProxyType ipfw". Resolves ticket
- 10267; patch from "yurivict".
- - Support OpenBSD's divert-to rules with the pf firewall for
- transparent proxy ports. To enable it, set "TransProxyType
- pf-divert". This allows Tor to run a TransPort transparent proxy
- port on OpenBSD 4.4 or later without root privileges. See the
- pf.conf(5) manual page for information on configuring pf to use
- divert-to rules. Closes ticket 10896; patch from Dana Koch.
- o Minor bugfixes (bridge client):
- - Stop accepting bridge lines containing hostnames. Doing so would
- cause clients to perform DNS requests on the hostnames, which was
- not sensible behavior. Fixes bug 10801; bugfix on 0.2.0.1-alpha.
- o Minor bugfixes (bridges):
- - Avoid potential crashes or bad behavior when launching a
- server-side managed proxy with ORPort or ExtORPort temporarily
- disabled. Fixes bug 9650; bugfix on 0.2.3.16-alpha.
- - Fix a bug where the first connection works to a bridge that uses a
- pluggable transport with client-side parameters, but we don't send
- the client-side parameters on subsequent connections. (We don't
- use any pluggable transports with client-side parameters yet,
- but ScrambleSuit will soon become the first one.) Fixes bug 9162;
- bugfix on 0.2.0.3-alpha. Based on a patch from "rl1987".
- o Minor bugfixes (build, auxiliary programs):
- - Stop preprocessing the "torify" script with autoconf, since
- it no longer refers to LOCALSTATEDIR. Fixes bug 5505; patch
- from Guilhem.
- - The tor-fw-helper program now follows the standard convention and
- exits with status code "0" on success. Fixes bug 9030; bugfix on
- 0.2.3.1-alpha. Patch by Arlo Breault.
- - Corrected ./configure advice for what openssl dev package you should
- install on Debian. Fixes bug 9207; bugfix on 0.2.0.1-alpha.
- o Minor bugfixes (client):
- - Avoid "Tried to open a socket with DisableNetwork set" warnings
- when starting a client with bridges configured and DisableNetwork
- set. (Tor launcher starts Tor with DisableNetwork set the first
- time it runs.) Fixes bug 10405; bugfix on 0.2.3.9-alpha.
- - Improve the log message when we can't connect to a hidden service
- because all of the hidden service directory nodes hosting its
- descriptor are excluded. Improves on our fix for bug 10722, which
- was a bugfix on 0.2.0.10-alpha.
- - Raise a control port warning when we fail to connect to all of
- our bridges. Previously, we didn't inform the controller, and
- the bootstrap process would stall. Fixes bug 11069; bugfix on
- 0.2.1.2-alpha.
- - Exit immediately when a process-owning controller exits.
- Previously, tor relays would wait for a little while after their
- controller exited, as if they had gotten an INT signal -- but this
- was problematic, since there was no feedback for the user. To do a
- clean shutdown, controllers should send an INT signal and give Tor
- a chance to clean up. Fixes bug 10449; bugfix on 0.2.2.28-beta.
- - Stop attempting to connect to bridges before our pluggable
- transports are configured (harmless but resulted in some erroneous
- log messages). Fixes bug 11156; bugfix on 0.2.3.2-alpha.
- - Fix connections to IPv6 addresses over SOCKS5. Previously, we were
- generating incorrect SOCKS5 responses, and confusing client
- applications. Fixes bug 10987; bugfix on 0.2.4.7-alpha.
- o Minor bugfixes (client, DNSPort):
- - When using DNSPort, try to respond to AAAA requests with AAAA
- answers. Previously, we hadn't looked at the request type when
- deciding which answer type to prefer. Fixes bug 10468; bugfix on
- 0.2.4.7-alpha.
- - When receiving a DNS query for an unsupported record type, reply
- with no answer rather than with a NOTIMPL error. This behavior
- isn't correct either, but it will break fewer client programs, we
- hope. Fixes bug 10268; bugfix on 0.2.0.1-alpha. Original patch
- from "epoch".
- o Minor bugfixes (client, logging during bootstrap):
- - Only report the first fatal bootstrap error on a given OR
- connection. This stops us from telling the controller bogus error
- messages like "DONE". Fixes bug 10431; bugfix on 0.2.1.1-alpha.
- - Avoid generating spurious warnings when starting with
- DisableNetwork enabled. Fixes bug 11200 and bug 10405; bugfix on
- 0.2.3.9-alpha.
- o Minor bugfixes (closing OR connections):
- - If write_to_buf() in connection_write_to_buf_impl_() ever fails,
- check if it's an or_connection_t and correctly call
- connection_or_close_for_error() rather than
- connection_mark_for_close() directly. Fixes bug 11304; bugfix on
- 0.2.4.4-alpha.
- - When closing all connections on setting DisableNetwork to 1, use
- connection_or_close_normally() rather than closing OR connections
- out from under the channel layer. Fixes bug 11306; bugfix on
- 0.2.4.4-alpha.
- o Minor bugfixes (code correctness):
- - Previously we used two temporary files when writing descriptors to
- disk; now we only use one. Fixes bug 1376.
- - Remove an erroneous (but impossible and thus harmless) pointer
- comparison that would have allowed compilers to skip a bounds
- check in channeltls.c. Fixes bugs 10313 and 9980; bugfix on
- 0.2.0.10-alpha. Noticed by Jared L Wong and David Fifield.
- - Fix an always-true assertion in pluggable transports code so it
- actually checks what it was trying to check. Fixes bug 10046;
- bugfix on 0.2.3.9-alpha. Found by "dcb".
- o Minor bugfixes (command line):
- - Use a single command-line parser for parsing torrc options on the
- command line and for finding special command-line options to avoid
- inconsistent behavior for torrc option arguments that have the same
- names as command-line options. Fixes bugs 4647 and 9578; bugfix on
- 0.0.9pre5.
- - No longer allow 'tor --hash-password' with no arguments. Fixes bug
- 9573; bugfix on 0.0.9pre5.
- o Minor bugfixes (compilation):
- - Compile correctly with builds and forks of OpenSSL (such as
- LibreSSL) that disable compression. Fixes bug 12602; bugfix on
- 0.2.1.1-alpha. Patch from "dhill".
- - Restore the ability to compile Tor with V2_HANDSHAKE_SERVER
- turned off (that is, without support for v2 link handshakes). Fixes
- bug 4677; bugfix on 0.2.3.2-alpha. Patch from "piet".
- - In routerlist_assert_ok(), don't take the address of a
- routerinfo's cache_info member unless that routerinfo is non-NULL.
- Fixes bug 13096; bugfix on 0.1.1.9-alpha. Patch by "teor".
- - Fix a large number of false positive warnings from the clang
- analyzer static analysis tool. This should make real warnings
- easier for clang analyzer to find. Patch from "teor". Closes
- ticket 13036.
- - Resolve GCC complaints on OpenBSD about discarding constness in
- TO_{ORIGIN,OR}_CIRCUIT functions. Fixes part of bug 11633; bugfix
- on 0.1.1.23. Patch from Dana Koch.
- - Resolve clang complaints on OpenBSD with -Wshorten-64-to-32 due to
- treatment of long and time_t as comparable types. Fixes part of
- bug 11633. Patch from Dana Koch.
- - When deciding whether to build the 64-bit curve25519
- implementation, detect platforms where we can compile 128-bit
- arithmetic but cannot link it. Fixes bug 11729; bugfix on
- 0.2.4.8-alpha. Patch from "conradev".
- - Fix compilation when DNS_CACHE_DEBUG is enabled. Fixes bug 11761;
- bugfix on 0.2.3.13-alpha. Found by "cypherpunks".
- - Fix compilation with dmalloc. Fixes bug 11605; bugfix
- on 0.2.4.10-alpha.
- - Build and run correctly on systems like OpenBSD-current that have
- patched OpenSSL to remove get_cipher_by_char and/or its
- implementations. Fixes issue 13325.
- o Minor bugfixes (controller and command-line):
- - If changing a config option via "setconf" fails in a recoverable
- way, we used to nonetheless write our new control ports to the
- file described by the "ControlPortWriteToFile" option. Now we only
- write out that file if we successfully switch to the new config
- option. Fixes bug 5605; bugfix on 0.2.2.26-beta. Patch from "Ryman".
- o Minor bugfixes (directory server):
- - No longer accept malformed http headers when parsing urls from
- headers. Now we reply with Bad Request ("400"). Fixes bug 2767;
- bugfix on 0.0.6pre1.
- - When sending a compressed set of descriptors or microdescriptors,
- make sure to finalize the zlib stream. Previously, we would write
- all the compressed data, but if the last descriptor we wanted to
- send was missing or too old, we would not mark the stream as
- finished. This caused problems for decompression tools. Fixes bug
- 11648; bugfix on 0.1.1.23.
- o Minor bugfixes (hidden service):
- - Only retry attempts to connect to a chosen rendezvous point 8
- times, not 30. Fixes bug 4241; bugfix on 0.1.0.1-rc.
- o Minor bugfixes (interface):
- - Reject relative control socket paths and emit a warning. Previously,
- single-component control socket paths would be rejected, but Tor
- would not log why it could not validate the config. Fixes bug 9258;
- bugfix on 0.2.3.16-alpha.
- o Minor bugfixes (log messages):
- - Fix a bug where clients using bridges would report themselves
- as 50% bootstrapped even without a live consensus document.
- Fixes bug 9922; bugfix on 0.2.1.1-alpha.
- - Suppress a warning where, if there's only one directory authority
- in the network, we would complain that votes and signatures cannot
- be uploaded to other directory authorities. Fixes bug 10842;
- bugfix on 0.2.2.26-beta.
- - Report bootstrapping progress correctly when we're downloading
- microdescriptors. We had updated our "do we have enough microdescs
- to begin building circuits?" logic most recently in 0.2.4.10-alpha
- (see bug 5956), but we left the bootstrap status event logic at
- "how far through getting 1/4 of them are we?" Fixes bug 9958;
- bugfix on 0.2.2.36, which is where they diverged (see bug 5343).
- o Minor bugfixes (logging):
- - Downgrade "Unexpected onionskin length after decryption" warning
- to a protocol-warn, since there's nothing relay operators can do
- about a client that sends them a malformed create cell. Resolves
- bug 12996; bugfix on 0.0.6rc1.
- - Log more specific warnings when we get an ESTABLISH_RENDEZVOUS
- cell on a cannibalized or non-OR circuit. Resolves ticket 12997.
- - When logging information about an EXTEND2 or EXTENDED2 cell, log
- their names correctly. Fixes part of bug 12700; bugfix
- on 0.2.4.8-alpha.
- - When logging information about a relay cell whose command we don't
- recognize, log its command as an integer. Fixes part of bug 12700;
- bugfix on 0.2.1.10-alpha.
- - Escape all strings from the directory connection before logging
- them. Fixes bug 13071; bugfix on 0.1.1.15. Patch from "teor".
- - Squelch a spurious LD_BUG message "No origin circuit for
- successful SOCKS stream" in certain hidden service failure cases;
- fixes bug 10616.
- - Downgrade the severity of the 'unexpected sendme cell from client'
- from 'warn' to 'protocol warning'. Closes ticket 8093.
- o Minor bugfixes (misc code correctness):
- - In munge_extrainfo_into_routerinfo(), check the return value of
- memchr(). This would have been a serious issue if we ever passed
- it a non-extrainfo. Fixes bug 8791; bugfix on 0.2.0.6-alpha. Patch
- from Arlo Breault.
- - On the chance that somebody manages to build Tor on a
- platform where time_t is unsigned, correct the way that
- microdesc_add_to_cache() handles negative time arguments.
- Fixes bug 8042; bugfix on 0.2.3.1-alpha.
- - Fix various instances of undefined behavior in channeltls.c,
- tor_memmem(), and eventdns.c that would cause us to construct
- pointers to memory outside an allocated object. (These invalid
- pointers were not accessed, but C does not even allow them to
- exist.) Fixes bug 10363; bugfixes on 0.1.1.1-alpha, 0.1.2.1-alpha,
- 0.2.0.10-alpha, and 0.2.3.6-alpha. Reported by "bobnomnom".
- - Use the AddressSanitizer and Ubsan sanitizers (in clang-3.4) to
- fix some miscellaneous errors in our tests and codebase. Fixes bug
- 11232. Bugfixes on versions back as far as 0.2.1.11-alpha.
- - Always check return values for unlink, munmap, UnmapViewOfFile;
- check strftime return values more often. In some cases all we can
- do is report a warning, but this may help prevent deeper bugs from
- going unnoticed. Closes ticket 8787; bugfixes on many, many tor
- versions.
- - Fix numerous warnings from the clang "scan-build" static analyzer.
- Some of these are programming style issues; some of them are false
- positives that indicated awkward code; some are undefined behavior
- cases related to constructing (but not using) invalid pointers;
- some are assumptions about API behavior; some are (harmlessly)
- logging sizeof(ptr) bytes from a token when sizeof(*ptr) would be
- correct; and one or two are genuine bugs that weren't reachable
- from the rest of the program. Fixes bug 8793; bugfixes on many,
- many tor versions.
- o Minor bugfixes (node selection):
- - If ExcludeNodes is set, consider non-excluded hidden service
- directory servers before excluded ones. Do not consider excluded
- hidden service directory servers at all if StrictNodes is
- set. (Previously, we would sometimes decide to connect to those
- servers, and then realize before we initiated a connection that
- we had excluded them.) Fixes bug 10722; bugfix on 0.2.0.10-alpha.
- Reported by "mr-4".
- - If we set the ExitNodes option but it doesn't include any nodes
- that have the Exit flag, we would choose not to bootstrap. Now we
- bootstrap so long as ExitNodes includes nodes which can exit to
- some port. Fixes bug 10543; bugfix on 0.2.4.10-alpha.
- o Minor bugfixes (performance):
- - Avoid a bug where every successful connection made us recompute
- the flag telling us whether we have sufficient information to
- build circuits. Previously, we would forget our cached value
- whenever we successfully opened a channel (or marked a router as
- running or not running for any other reason), regardless of
- whether we had previously believed the router to be running. This
- forced us to run an expensive update operation far too often.
- Fixes bug 12170; bugfix on 0.1.2.1-alpha.
- - Avoid using tor_memeq() for checking relay cell integrity. This
- removes a possible performance bottleneck. Fixes part of bug
- 12169; bugfix on 0.2.1.31.
- o Minor bugfixes (platform-specific):
- - When dumping a malformed directory object to disk, save it in
- binary mode on Windows, not text mode. Fixes bug 11342; bugfix on
- 0.2.2.1-alpha.
- - Don't report failures from make_socket_reuseable() on incoming
- sockets on OSX: this can happen when incoming connections close
- early. Fixes bug 10081.
- o Minor bugfixes (pluggable transports):
- - Avoid another 60-second delay when starting Tor in a pluggable-
- transport-using configuration when we already have cached
- descriptors for our bridges. Fixes bug 11965; bugfix
- on 0.2.3.6-alpha.
- o Minor bugfixes (protocol correctness):
- - When receiving a VERSIONS cell with an odd number of bytes, close
- the connection immediately since the cell is malformed. Fixes bug
- 10365; bugfix on 0.2.0.10-alpha. Spotted by "bobnomnom"; fix by
- "rl1987".
- o Minor bugfixes (relay, other):
- - We now drop CREATE cells for already-existent circuit IDs and for
- zero-valued circuit IDs, regardless of other factors that might
- otherwise have called for DESTROY cells. Fixes bug 12191; bugfix
- on 0.0.8pre1.
- - When rejecting DATA cells for stream_id zero, still count them
- against the circuit's deliver window so that we don't fail to send
- a SENDME. Fixes bug 11246; bugfix on 0.2.4.10-alpha.
- o Minor bugfixes (relay, threading):
- - Check return code on spawn_func() in cpuworker code, so that we
- don't think we've spawned a nonworking cpuworker and write junk to
- it forever. Fix related to bug 4345; bugfix on all released Tor
- versions. Found by "skruffy".
- - Use a pthread_attr to make sure that spawn_func() cannot return an
- error while at the same time launching a thread. Fix related to
- bug 4345; bugfix on all released Tor versions. Reported
- by "cypherpunks".
- o Minor bugfixes (relays and bridges):
- - Avoid crashing on a malformed resolv.conf file when running a
- relay using Libevent 1. Fixes bug 8788; bugfix on 0.1.1.23.
- - Non-exit relays no longer launch mock DNS requests to check for
- DNS hijacking. This has been unnecessary since 0.2.1.7-alpha, when
- non-exit relays stopped servicing DNS requests. Fixes bug 965;
- bugfix on 0.2.1.7-alpha. Patch from Matt Pagan.
- - Bridges now report complete directory request statistics. Related
- to bug 5824; bugfix on 0.2.2.1-alpha.
- - Bridges now never collect statistics that were designed for
- relays. Fixes bug 5824; bugfix on 0.2.3.8-alpha.
- o Minor bugfixes (testing):
- - Fix all valgrind warnings produced by the unit tests. There were
- over a thousand memory leak warnings previously, mostly produced
- by forgetting to free things in the unit test code. Fixes bug
- 11618, bugfixes on many versions of Tor.
- o Minor bugfixes (tor-fw-helper):
- - Give a correct log message when tor-fw-helper fails to launch.
- (Previously, we would say something like "tor-fw-helper sent us a
- string we could not parse".) Fixes bug 9781; bugfix
- on 0.2.4.2-alpha.
- o Minor bugfixes (trivial memory leaks):
- - Fix a small memory leak when signing a directory object. Fixes bug
- 11275; bugfix on 0.2.4.13-alpha.
- - Resolve some memory leaks found by coverity in the unit tests, on
- exit in tor-gencert, and on a failure to compute digests for our
- own keys when generating a v3 networkstatus vote. These leaks
- should never have affected anyone in practice.
- o Code simplification and refactoring:
- - Remove some old fallback code designed to keep Tor clients working
- in a network with only two working relays. Elsewhere in the code we
- have long since stopped supporting such networks, so there wasn't
- much point in keeping it around. Addresses ticket 9926.
- - Reject 0-length EXTEND2 cells more explicitly. Fixes bug 10536;
- bugfix on 0.2.4.8-alpha. Reported by "cypherpunks".
- - Extract the common duplicated code for creating a subdirectory
- of the data directory and writing to a file in it. Fixes ticket
- 4282; patch from Peter Retzlaff.
- - Since OpenSSL 0.9.7, the i2d_*() functions support allocating output
- buffer. Avoid calling twice: i2d_RSAPublicKey(), i2d_DHparams(),
- i2d_X509(), and i2d_PublicKey(). Resolves ticket 5170.
- - Add a set of accessor functions for the circuit timeout data
- structure. Fixes ticket 6153; patch from "piet".
- - Clean up exit paths from connection_listener_new(). Closes ticket
- 8789. Patch from Arlo Breault.
- - Since we rely on OpenSSL 0.9.8 now, we can use EVP_PKEY_cmp()
- and drop our own custom pkey_eq() implementation. Fixes bug 9043.
- - Use a doubly-linked list to implement the global circuit list.
- Resolves ticket 9108. Patch from Marek Majkowski.
- - Remove contrib/id_to_fp.c since it wasn't used anywhere.
- - Remove constants and tests for PKCS1 padding; it's insecure and
- shouldn't be used for anything new. Fixes bug 8792; patch
- from Arlo Breault.
- - Remove instances of strcpy() from the unit tests. They weren't
- hurting anything, since they were only in the unit tests, but it's
- embarrassing to have strcpy() in the code at all, and some analysis
- tools don't like it. Fixes bug 8790; bugfix on 0.2.3.6-alpha and
- 0.2.3.8-alpha. Patch from Arlo Breault.
- - Remove is_internal_IP() function. Resolves ticket 4645.
- - Remove unused function circuit_dump_by_chan from circuitlist.c.
- Closes issue 9107; patch from "marek".
- - Change our use of the ENUM_BF macro to avoid declarations that
- confuse Doxygen.
- - Get rid of router->address, since in all cases it was just the
- string representation of router->addr. Resolves ticket 5528.
- o Documentation:
- - Adjust the URLs in the README to refer to the new locations of
- several documents on the website. Fixes bug 12830. Patch from
- Matt Pagan.
- - Document 'reject6' and 'accept6' ExitPolicy entries. Resolves
- ticket 12878.
- - Update manpage to describe some of the files you can expect to
- find in Tor's DataDirectory. Addresses ticket 9839.
- - Clean up several option names in the manpage to match their real
- names, add the missing documentation for a couple of testing and
- directory authority options, remove the documentation for a
- V2-directory fetching option that no longer exists. Resolves
- ticket 11634.
- - Correct the documentation so that it lists the correct directory
- for the stats files. (They are in a subdirectory called "stats",
- not "status".)
- - In the manpage, move more authority-only options into the
- directory authority section so that operators of regular directory
- caches don't get confused.
- - Fix the layout of the SOCKSPort flags in the manpage. Fixes bug
- 11061; bugfix on 0.2.4.7-alpha.
- - Resolve warnings from Doxygen.
- - Document in the manpage that "KBytes" may also be written as
- "kilobytes" or "KB", that "Kbits" may also be written as
- "kilobits", and so forth. Closes ticket 9222.
- - Document that the ClientOnly config option overrides ORPort.
- Our old explanation made ClientOnly sound as though it did
- nothing at all. Resolves bug 9059.
- - Explain that SocksPolicy, DirPolicy, and similar options don't
- take port arguments. Fixes the other part of ticket 11108.
- - Fix a comment about the rend_server_descriptor_t.protocols field
- to more accurately describe its range. Also, make that field
- unsigned, to more accurately reflect its usage. Fixes bug 9099;
- bugfix on 0.2.1.5-alpha.
- - Fix the manpage's description of HiddenServiceAuthorizeClient:
- the maximum client name length is 16, not 19. Fixes bug 11118;
- bugfix on 0.2.1.6-alpha.
- o Package cleanup:
- - The contrib directory has been sorted and tidied. Before, it was
- an unsorted dumping ground for useful and not-so-useful things.
- Now, it is divided based on functionality, and the items which
- seemed to be nonfunctional or useless have been removed. Resolves
- ticket 8966; based on patches from "rl1987".
- o Removed code and features:
- - Clients now reject any directory authority certificates lacking
- a dir-key-crosscert element. These have been included since
- 0.2.1.9-alpha, so there's no real reason for them to be optional
- any longer. Completes proposal 157. Resolves ticket 10162.
- - Remove all code that existed to support the v2 directory system,
- since there are no longer any v2 directory authorities. Resolves
- ticket 10758.
- - Remove the HSAuthoritativeDir and AlternateHSAuthority torrc
- options, which were used for designating authorities as "Hidden
- service authorities". There has been no use of hidden service
- authorities since 0.2.2.1-alpha, when we stopped uploading or
- downloading v0 hidden service descriptors. Fixes bug 10881; also
- part of a fix for bug 10841.
- - Remove /tor/dbg-stability.txt URL that was meant to help debug WFU
- and MTBF calculations, but that nobody was using. Fixes bug 11742.
- - The TunnelDirConns and PreferTunnelledDirConns options no longer
- exist; tunneled directory connections have been available since
- 0.1.2.5-alpha, and turning them off is not a good idea. This is a
- brute-force fix for 10849, where "TunnelDirConns 0" would break
- hidden services.
- - Remove all code for the long unused v1 directory protocol.
- Resolves ticket 11070.
- - Remove all remaining code related to version-0 hidden service
- descriptors: they have not been in use since 0.2.2.1-alpha. Fixes
- the rest of bug 10841.
- - Remove migration code from when we renamed the "cached-routers"
- file to "cached-descriptors" back in 0.2.0.8-alpha. This
- incidentally resolves ticket 6502 by cleaning up the related code
- a bit. Patch from Akshay Hebbar.
- o Test infrastructure:
- - Tor now builds each source file in two modes: a mode that avoids
- exposing identifiers needlessly, and another mode that exposes
- more identifiers for testing. This lets the compiler do better at
- optimizing the production code, while enabling us to take more
- radical measures to let the unit tests test things.
- - The production builds no longer include functions used only in
- the unit tests; all functions exposed from a module only for
- unit-testing are now static in production builds.
- - Add an --enable-coverage configuration option to make the unit
- tests (and a new src/or/tor-cov target) to build with gcov test
- coverage support.
- - Update to the latest version of tinytest.
- - Improve the tinytest implementation of string operation tests so
- that comparisons with NULL strings no longer crash the tests; they
- now just fail, normally. Fixes bug 9004; bugfix on 0.2.2.4-alpha.
- - New macros in test.h to simplify writing mock-functions for unit
- tests. Part of ticket 11507. Patch from Dana Koch.
- - We now have rudimentary function mocking support that our unit
- tests can use to test functions in isolation. Function mocking
- lets the tests temporarily replace a function's dependencies with
- stub functions, so that the tests can check the function without
- invoking the other functions it calls.
- o Testing:
- - Complete tests for the status.c module. Resolves ticket 11507.
- Patch from Dana Koch.
- - Add more unit tests for the <circid,channel>->circuit map, and
- the destroy-cell-tracking code to fix bug 7912.
- - Unit tests for failing cases of the TAP onion handshake.
- - More unit tests for address-manipulation functions.
- o Distribution (systemd):
- - Include a tor.service file in contrib/dist for use with systemd.
- Some distributions will be able to use this file unmodified;
- others will need to tweak it, or write their own. Patch from Jamie
- Nguyen; resolves ticket 8368.
- - Verify configuration file via ExecStartPre in the systemd unit
- file. Patch from intrigeri; resolves ticket 12730.
- - Explicitly disable RunAsDaemon in the systemd unit file. Our
- current systemd unit uses "Type = simple", so systemd does not
- expect tor to fork. If the user has "RunAsDaemon 1" in their
- torrc, then things won't work as expected. This is e.g. the case
- on Debian (and derivatives), since there we pass "--defaults-torrc
- /usr/share/tor/tor-service-defaults-torrc" (that contains
- "RunAsDaemon 1") by default. Patch by intrigeri; resolves
- ticket 12731.
- Changes in version 0.2.4.25 - 2014-10-20
- Tor 0.2.4.25 disables SSL3 in response to the recent "POODLE" attack
- (even though POODLE does not affect Tor). It also works around a crash
- bug caused by some operating systems' response to the "POODLE" attack
- (which does affect Tor).
- o Major security fixes (also in 0.2.5.9-rc):
- - Disable support for SSLv3. All versions of OpenSSL in use with Tor
- today support TLS 1.0 or later, so we can safely turn off support
- for this old (and insecure) protocol. Fixes bug 13426.
- o Major bugfixes (openssl bug workaround, also in 0.2.5.9-rc):
- - Avoid crashing when using OpenSSL version 0.9.8zc, 1.0.0o, or
- 1.0.1j, built with the 'no-ssl3' configuration option. Fixes bug
- 13471. This is a workaround for an OpenSSL bug.
- Changes in version 0.2.4.24 - 2014-09-22
- Tor 0.2.4.24 fixes a bug that affects consistency and speed when
- connecting to hidden services, and it updates the location of one of
- the directory authorities.
- o Major bugfixes:
- - Clients now send the correct address for their chosen rendezvous
- point when trying to access a hidden service. They used to send
- the wrong address, which would still work some of the time because
- they also sent the identity digest of the rendezvous point, and if
- the hidden service happened to try connecting to the rendezvous
- point from a relay that already had a connection open to it,
- the relay would reuse that connection. Now connections to hidden
- services should be more robust and faster. Also, this bug meant
- that clients were leaking to the hidden service whether they were
- on a little-endian (common) or big-endian (rare) system, which for
- some users might have reduced their anonymity. Fixes bug 13151;
- bugfix on 0.2.1.5-alpha.
- o Directory authority changes:
- - Change IP address for gabelmoo (v3 directory authority).
- o Minor features (geoip):
- - Update geoip and geoip6 to the August 7 2014 Maxmind GeoLite2
- Country database.
- Changes in version 0.2.4.23 - 2014-07-28
- Tor 0.2.4.23 brings us a big step closer to slowing down the risk from
- guard rotation, and also backports several important fixes from the
- Tor 0.2.5 alpha release series.
- o Major features:
- - Clients now look at the "usecreatefast" consensus parameter to
- decide whether to use CREATE_FAST or CREATE cells for the first hop
- of their circuit. This approach can improve security on connections
- where Tor's circuit handshake is stronger than the available TLS
- connection security levels, but the tradeoff is more computational
- load on guard relays. Implements proposal 221. Resolves ticket 9386.
- - Make the number of entry guards configurable via a new
- NumEntryGuards consensus parameter, and the number of directory
- guards configurable via a new NumDirectoryGuards consensus
- parameter. Implements ticket 12688.
- o Major bugfixes:
- - Fix a bug in the bounds-checking in the 32-bit curve25519-donna
- implementation that caused incorrect results on 32-bit
- implementations when certain malformed inputs were used along with
- a small class of private ntor keys. This bug does not currently
- appear to allow an attacker to learn private keys or impersonate a
- Tor server, but it could provide a means to distinguish 32-bit Tor
- implementations from 64-bit Tor implementations. Fixes bug 12694;
- bugfix on 0.2.4.8-alpha. Bug found by Robert Ransom; fix from
- Adam Langley.
- o Minor bugfixes:
- - Warn and drop the circuit if we receive an inbound 'relay early'
- cell. Those used to be normal to receive on hidden service circuits
- due to bug 1038, but the buggy Tor versions are long gone from
- the network so we can afford to resume watching for them. Resolves
- the rest of bug 1038; bugfix on 0.2.1.19.
- - Correct a confusing error message when trying to extend a circuit
- via the control protocol but we don't know a descriptor or
- microdescriptor for one of the specified relays. Fixes bug 12718;
- bugfix on 0.2.3.1-alpha.
- - Avoid an illegal read from stack when initializing the TLS
- module using a version of OpenSSL without all of the ciphers
- used by the v2 link handshake. Fixes bug 12227; bugfix on
- 0.2.4.8-alpha. Found by "starlight".
- o Minor features:
- - Update geoip and geoip6 to the July 10 2014 Maxmind GeoLite2
- Country database.
- Changes in version 0.2.4.22 - 2014-05-16
- Tor 0.2.4.22 backports numerous high-priority fixes from the Tor 0.2.5
- alpha release series. These include blocking all authority signing
- keys that may have been affected by the OpenSSL "heartbleed" bug,
- choosing a far more secure set of TLS ciphersuites by default, closing
- a couple of memory leaks that could be used to run a target relay out
- of RAM, and several others.
- o Major features (security, backport from 0.2.5.4-alpha):
- - Block authority signing keys that were used on authorities
- vulnerable to the "heartbleed" bug in OpenSSL (CVE-2014-0160). (We
- don't have any evidence that these keys _were_ compromised; we're
- doing this to be prudent.) Resolves ticket 11464.
- o Major bugfixes (security, OOM):
- - Fix a memory leak that could occur if a microdescriptor parse
- fails during the tokenizing step. This bug could enable a memory
- exhaustion attack by directory servers. Fixes bug 11649; bugfix
- on 0.2.2.6-alpha.
- o Major bugfixes (TLS cipher selection, backport from 0.2.5.4-alpha):
- - The relay ciphersuite list is now generated automatically based on
- uniform criteria, and includes all OpenSSL ciphersuites with
- acceptable strength and forward secrecy. Previously, we had left
- some perfectly fine ciphersuites unsupported due to omission or
- typo. Resolves bugs 11513, 11492, 11498, 11499. Bugs reported by
- 'cypherpunks'. Bugfix on 0.2.4.8-alpha.
- - Relays now trust themselves to have a better view than clients of
- which TLS ciphersuites are better than others. (Thanks to bug
- 11513, the relay list is now well-considered, whereas the client
- list has been chosen mainly for anti-fingerprinting purposes.)
- Relays prefer: AES over 3DES; then ECDHE over DHE; then GCM over
- CBC; then SHA384 over SHA256 over SHA1; and last, AES256 over
- AES128. Resolves ticket 11528.
- - Clients now try to advertise the same list of ciphersuites as
- Firefox 28. This change enables selection of (fast) GCM
- ciphersuites, disables some strange old ciphers, and stops
- advertising the ECDH (not to be confused with ECDHE) ciphersuites.
- Resolves ticket 11438.
- o Minor bugfixes (configuration, security):
- - When running a hidden service, do not allow TunneledDirConns 0:
- trying to set that option together with a hidden service would
- otherwise prevent the hidden service from running, and also make
- it publish its descriptors directly over HTTP. Fixes bug 10849;
- bugfix on 0.2.1.1-alpha.
- o Minor bugfixes (controller, backport from 0.2.5.4-alpha):
- - Avoid sending a garbage value to the controller when a circuit is
- cannibalized. Fixes bug 11519; bugfix on 0.2.3.11-alpha.
- o Minor bugfixes (exit relay, backport from 0.2.5.4-alpha):
- - Stop leaking memory when we successfully resolve a PTR record.
- Fixes bug 11437; bugfix on 0.2.4.7-alpha.
- o Minor bugfixes (bridge client, backport from 0.2.5.4-alpha):
- - Avoid 60-second delays in the bootstrapping process when Tor is
- launching for a second time while using bridges. Fixes bug 9229;
- bugfix on 0.2.0.3-alpha.
- o Minor bugfixes (relays and bridges, backport from 0.2.5.4-alpha):
- - Give the correct URL in the warning message when trying to run a
- relay on an ancient version of Windows. Fixes bug 9393.
- o Minor bugfixes (compilation):
- - Fix a compilation error when compiling with --disable-curve25519.
- Fixes bug 9700; bugfix on 0.2.4.17-rc.
- o Minor bugfixes:
- - Downgrade the warning severity for the the "md was still
- referenced 1 node(s)" warning. Tor 0.2.5.4-alpha has better code
- for trying to diagnose this bug, and the current warning in
- earlier versions of tor achieves nothing useful. Addresses warning
- from bug 7164.
- o Minor features (log verbosity, backport from 0.2.5.4-alpha):
- - When we run out of usable circuit IDs on a channel, log only one
- warning for the whole channel, and describe how many circuits
- there were on the channel. Fixes part of ticket 11553.
- o Minor features (security, backport from 0.2.5.4-alpha):
- - Decrease the lower limit of MaxMemInCellQueues to 256 MBytes (but
- leave the default at 8GBytes), to better support Raspberry Pi
- users. Fixes bug 9686; bugfix on 0.2.4.14-alpha.
- o Documentation (backport from 0.2.5.4-alpha):
- - Correctly document that we search for a system torrc file before
- looking in ~/.torrc. Fixes documentation side of 9213; bugfix on
- 0.2.3.18-rc.
- Changes in version 0.2.4.21 - 2014-02-28
- Tor 0.2.4.21 further improves security against potential adversaries who
- find breaking 1024-bit crypto doable, and backports several stability
- and robustness patches from the 0.2.5 branch.
- o Major features (client security):
- - When we choose a path for a 3-hop circuit, make sure it contains
- at least one relay that supports the NTor circuit extension
- handshake. Otherwise, there is a chance that we're building
- a circuit that's worth attacking by an adversary who finds
- breaking 1024-bit crypto doable, and that chance changes the game
- theory. Implements ticket 9777.
- o Major bugfixes:
- - Do not treat streams that fail with reason
- END_STREAM_REASON_INTERNAL as indicating a definite circuit failure,
- since it could also indicate an ENETUNREACH connection error. Fixes
- part of bug 10777; bugfix on 0.2.4.8-alpha.
- o Code simplification and refactoring:
- - Remove data structures which were introduced to implement the
- CellStatistics option: they are now redundant with the new timestamp
- field in the regular packed_cell_t data structure, which we did
- in 0.2.4.18-rc in order to resolve bug 9093. Resolves ticket 10870.
- o Minor features:
- - Always clear OpenSSL bignums before freeing them -- even bignums
- that don't contain secrets. Resolves ticket 10793. Patch by
- Florent Daigniere.
- - Build without warnings under clang 3.4. (We have some macros that
- define static functions only some of which will get used later in
- the module. Starting with clang 3.4, these give a warning unless the
- unused attribute is set on them.) Resolves ticket 10904.
- - Update geoip and geoip6 files to the February 7 2014 Maxmind
- GeoLite2 Country database.
- o Minor bugfixes:
- - Set the listen() backlog limit to the largest actually supported
- on the system, not to the value in a header file. Fixes bug 9716;
- bugfix on every released Tor.
- - Treat ENETUNREACH, EACCES, and EPERM connection failures at an
- exit node as a NOROUTE error, not an INTERNAL error, since they
- can apparently happen when trying to connect to the wrong sort
- of netblocks. Fixes part of bug 10777; bugfix on 0.1.0.1-rc.
- - Fix build warnings about missing "a2x" comment when building the
- manpages from scratch on OpenBSD; OpenBSD calls it "a2x.py".
- Fixes bug 10929; bugfix on 0.2.2.9-alpha. Patch from Dana Koch.
- - Avoid a segfault on SIGUSR1, where we had freed a connection but did
- not entirely remove it from the connection lists. Fixes bug 9602;
- bugfix on 0.2.4.4-alpha.
- - Fix a segmentation fault in our benchmark code when running with
- Fedora's OpenSSL package, or any other OpenSSL that provides
- ECDH but not P224. Fixes bug 10835; bugfix on 0.2.4.8-alpha.
- - Turn "circuit handshake stats since last time" log messages into a
- heartbeat message. Fixes bug 10485; bugfix on 0.2.4.17-rc.
- o Documentation fixes:
- - Document that all but one DirPort entry must have the NoAdvertise
- flag set. Fixes bug 10470; bugfix on 0.2.3.3-alpha / 0.2.3.16-alpha.
- Changes in version 0.2.4.20 - 2013-12-22
- Tor 0.2.4.20 fixes potentially poor random number generation for users
- who 1) use OpenSSL 1.0.0 or later, 2) set "HardwareAccel 1" in their
- torrc file, 3) have "Sandy Bridge" or "Ivy Bridge" Intel processors,
- and 4) have no state file in their DataDirectory (as would happen on
- first start). Users who generated relay or hidden service identity
- keys in such a situation should discard them and generate new ones.
- This release also fixes a logic error that caused Tor clients to build
- many more preemptive circuits than they actually need.
- o Major bugfixes:
- - Do not allow OpenSSL engines to replace the PRNG, even when
- HardwareAccel is set. The only default builtin PRNG engine uses
- the Intel RDRAND instruction to replace the entire PRNG, and
- ignores all attempts to seed it with more entropy. That's
- cryptographically stupid: the right response to a new alleged
- entropy source is never to discard all previously used entropy
- sources. Fixes bug 10402; works around behavior introduced in
- OpenSSL 1.0.0. Diagnosis and investigation thanks to "coderman"
- and "rl1987".
- - Fix assertion failure when AutomapHostsOnResolve yields an IPv6
- address. Fixes bug 10465; bugfix on 0.2.4.7-alpha.
- - Avoid launching spurious extra circuits when a stream is pending.
- This fixes a bug where any circuit that _wasn't_ unusable for new
- streams would be treated as if it were, causing extra circuits to
- be launched. Fixes bug 10456; bugfix on 0.2.4.12-alpha.
- o Minor bugfixes:
- - Avoid a crash bug when starting with a corrupted microdescriptor
- cache file. Fixes bug 10406; bugfix on 0.2.2.6-alpha.
- - If we fail to dump a previously cached microdescriptor to disk, avoid
- freeing duplicate data later on. Fixes bug 10423; bugfix on
- 0.2.4.13-alpha. Spotted by "bobnomnom".
- Changes in version 0.2.4.19 - 2013-12-11
- The Tor 0.2.4 release series is dedicated to the memory of Aaron Swartz
- (1986-2013). Aaron worked on diverse projects including helping to guide
- Creative Commons, playing a key role in stopping SOPA/PIPA, bringing
- transparency to the U.S government's PACER documents, and contributing
- design and development for Tor and Tor2Web. Aaron was one of the latest
- martyrs in our collective fight for civil liberties and human rights,
- and his death is all the more painful because he was one of us.
- Tor 0.2.4.19, the first stable release in the 0.2.4 branch, features
- a new circuit handshake and link encryption that use ECC to provide
- better security and efficiency; makes relays better manage circuit
- creation requests; uses "directory guards" to reduce client enumeration
- risks; makes bridges collect and report statistics about the pluggable
- transports they support; cleans up and improves our geoip database;
- gets much closer to IPv6 support for clients, bridges, and relays; makes
- directory authorities use measured bandwidths rather than advertised
- ones when computing flags and thresholds; disables client-side DNS
- caching to reduce tracking risks; and fixes a big bug in bridge
- reachability testing. This release introduces two new design
- abstractions in the code: a new "channel" abstraction between circuits
- and or_connections to allow for implementing alternate relay-to-relay
- transports, and a new "circuitmux" abstraction storing the queue of
- circuits for a channel. The release also includes many stability,
- security, and privacy fixes.
- o Major features (new circuit handshake):
- - Tor now supports a new circuit extension handshake designed by Ian
- Goldberg, Douglas Stebila, and Berkant Ustaoglu. Our original
- circuit extension handshake, later called "TAP", was a bit slow
- (especially on the relay side), had a fragile security proof, and
- used weaker keys than we'd now prefer. The new circuit handshake
- uses Dan Bernstein's "curve25519" elliptic-curve Diffie-Hellman
- function, making it significantly more secure than the older
- handshake, and significantly faster. Tor can use one of two built-in
- pure-C curve25519-donna implementations by Adam Langley, or it
- can link against the "nacl" library for a tuned version if present.
- The built-in version is very fast for 64-bit systems when building
- with GCC. The built-in 32-bit version is still faster than the
- old TAP protocol, but using libnacl is better on most such hosts.
- Implements proposal 216; closes ticket 7202.
- o Major features (better link encryption):
- - Relays can now enable the ECDHE TLS ciphersuites when available
- and appropriate. These ciphersuites let us negotiate forward-secure
- TLS secret keys more safely and more efficiently than with our
- previous use of Diffie-Hellman modulo a 1024-bit prime. By default,
- public relays prefer the (faster) P224 group, and bridges prefer
- the (more common) P256 group; you can override this with the
- TLSECGroup option.
- This feature requires clients running 0.2.3.17-beta or later,
- and requires both sides to be running OpenSSL 1.0.0 or later
- with ECC support. OpenSSL 1.0.1, with the compile-time option
- "enable-ec_nistp_64_gcc_128", is highly recommended.
- Implements the relay side of proposal 198; closes ticket 7200.
- - Re-enable TLS 1.1 and 1.2 when built with OpenSSL 1.0.1e or later.
- Resolves ticket 6055. (OpenSSL before 1.0.1 didn't have TLS 1.1 or
- 1.2, and OpenSSL from 1.0.1 through 1.0.1d had bugs that prevented
- renegotiation from working with TLS 1.1 or 1.2, so we had disabled
- them to solve bug 6033.)
- o Major features (relay performance):
- - Instead of limiting the number of queued onionskins (aka circuit
- create requests) to a fixed, hard-to-configure number, we limit
- the size of the queue based on how many we expect to be able to
- process in a given amount of time. We estimate the time it will
- take to process an onionskin based on average processing time
- of previous onionskins. Closes ticket 7291. You'll never have to
- configure MaxOnionsPending again.
- - Relays process the new "NTor" circuit-level handshake requests
- with higher priority than the old "TAP" circuit-level handshake
- requests. We still process some TAP requests to not totally starve
- 0.2.3 clients when NTor becomes popular. A new consensus parameter
- "NumNTorsPerTAP" lets us tune the balance later if we need to.
- Implements ticket 9574.
- o Major features (client bootstrapping resilience):
- - Add a new "FallbackDir" torrc option to use when we can't use
- a directory mirror from the consensus (either because we lack a
- consensus, or because they're all down). Currently, all authorities
- are fallbacks by default, and there are no other default fallbacks,
- but that will change. This option will allow us to give clients a
- longer list of servers to try to get a consensus from when first
- connecting to the Tor network, and thereby reduce load on the
- directory authorities. Implements proposal 206, "Preconfigured
- directory sources for bootstrapping". We also removed the old
- "FallbackNetworkstatus" option, since we never got it working well
- enough to use it. Closes bug 572.
- - If we have no circuits open, use a relaxed timeout (the
- 95th-percentile cutoff) until a circuit succeeds. This heuristic
- should allow Tor to succeed at building circuits even when the
- network connection drastically changes. Should help with bug 3443.
- o Major features (use of guards):
- - Support directory guards (proposal 207): when possible, clients now
- use their entry guards for non-anonymous directory requests. This
- can help prevent client enumeration. Note that this behavior only
- works when we have a usable consensus directory, and when options
- about what to download are more or less standard. In the future we
- should re-bootstrap from our guards, rather than re-bootstrapping
- from the preconfigured list of directory sources that ships with
- Tor. Resolves ticket 6526.
- - Raise the default time that a client keeps an entry guard from
- "1-2 months" to "2-3 months", as suggested by Tariq Elahi's WPES
- 2012 paper. (We would make it even longer, but we need better client
- load balancing first.) Also, make the guard lifetime controllable
- via a new GuardLifetime torrc option and a GuardLifetime consensus
- parameter. Start of a fix for bug 8240; bugfix on 0.1.1.11-alpha.
- o Major features (bridges with pluggable transports):
- - Bridges now report the pluggable transports they support to the
- bridge authority, so it can pass the supported transports on to
- bridgedb and/or eventually do reachability testing. Implements
- ticket 3589.
- - Automatically forward the TCP ports of pluggable transport
- proxies using tor-fw-helper if PortForwarding is enabled. Implements
- ticket 4567.
- o Major features (geoip database):
- - Maxmind began labelling Tor relays as being in country "A1",
- which breaks by-country node selection inside Tor. Now we use a
- script to replace "A1" ("Anonymous Proxy") entries in our geoip
- file with real country codes. This script fixes about 90% of "A1"
- entries automatically and uses manual country code assignments to
- fix the remaining 10%. See src/config/README.geoip for details.
- Fixes bug 6266.
- - Add GeoIP database for IPv6 addresses. The new config option
- is GeoIPv6File.
- - Update to the October 2 2013 Maxmind GeoLite Country database.
- o Major features (IPv6):
- - Clients who set "ClientUseIPv6 1" may connect to entry nodes over
- IPv6. Set "ClientPreferIPv6ORPort 1" to make this even more likely
- to happen. Implements ticket 5535.
- - All kind of relays, not just bridges, can now advertise an IPv6
- OR port. Implements ticket 6362.
- - Relays can now exit to IPv6 addresses: make sure that you have IPv6
- connectivity, then set the IPv6Exit flag to 1. Also make sure your
- exit policy reads as you would like: the address * applies to all
- address families, whereas *4 is IPv4 address only, and *6 is IPv6
- addresses only. On the client side, you'll need to wait for enough
- exits to support IPv6, apply the "IPv6Traffic" flag to a SocksPort,
- and use Socks5. Closes ticket 5547, implements proposal 117 as
- revised in proposal 208.
- - Bridge authorities now accept IPv6 bridge addresses and include
- them in network status documents. Implements ticket 5534.
- - Directory authorities vote on IPv6 OR ports. Implements ticket 6363.
- o Major features (directory authorities):
- - Directory authorities now prefer using measured bandwidths to
- advertised ones when computing flags and thresholds. Resolves
- ticket 8273.
- - Directory authorities that vote measured bandwidths about more
- than a threshold number of relays now treat relays with
- unmeasured bandwidths as having bandwidth 0 when computing their
- flags. Resolves ticket 8435.
- - Directory authorities now support a new consensus method (17)
- where they cap the published bandwidth of relays for which
- insufficient bandwidth measurements exist. Fixes part of bug 2286.
- - Directory authorities that set "DisableV2DirectoryInfo_ 1" no longer
- serve any v2 directory information. Now we can test disabling the
- old deprecated v2 directory format, and see whether doing so has
- any effect on network load. Begins to fix bug 6783.
- o Major features (build and portability):
- - Switch to a nonrecursive Makefile structure. Now instead of each
- Makefile.am invoking other Makefile.am's, there is a master
- Makefile.am that includes the others. This change makes our build
- process slightly more maintainable, and improves parallelism for
- building with make -j. Original patch by Stewart Smith; various
- fixes by Jim Meyering.
- - Where available, we now use automake's "silent" make rules by
- default, so that warnings are easier to spot. You can get the old
- behavior with "make V=1". Patch by Stewart Smith for ticket 6522.
- - Resume building correctly with MSVC and Makefile.nmake. This patch
- resolves numerous bugs and fixes reported by ultramage, including
- 7305, 7308, 7309, 7310, 7312, 7313, 7315, 7316, and 7669.
- o Security features:
- - Switch to a completely time-invariant approach for picking nodes
- weighted by bandwidth. Our old approach would run through the
- part of the loop after it had made its choice slightly slower
- than it ran through the part of the loop before it had made its
- choice. Addresses ticket 6538.
- - Disable the use of Guard nodes when in Tor2WebMode. Guard usage
- by tor2web clients allows hidden services to identify tor2web
- clients through their repeated selection of the same rendezvous
- and introduction point circuit endpoints (their guards). Resolves
- ticket 6888.
- o Major bugfixes (relay denial of service):
- - When we have too much memory queued in circuits (according to a new
- MaxMemInCellQueues option), close the circuits that have the oldest
- queued cells, on the theory that those are most responsible for
- us running low on memory. This prevents us from running out of
- memory as a relay if circuits fill up faster than they can be
- drained. Fixes bugs 9063 and 9093; bugfix on the 54th commit of
- Tor. This bug is a further fix beyond bug 6252, whose fix was
- merged into 0.2.3.21-rc.
- - Reject bogus create and relay cells with 0 circuit ID or 0 stream
- ID: these could be used to create unexpected streams and circuits
- which would count as "present" to some parts of Tor but "absent"
- to others, leading to zombie circuits and streams or to a bandwidth
- denial-of-service. Fixes bug 7889; bugfix on every released version
- of Tor. Reported by "oftc_must_be_destroyed".
- - Avoid a bug where our response to TLS renegotiation under certain
- network conditions could lead to a busy-loop, with 100% CPU
- consumption. Fixes bug 5650; bugfix on 0.2.0.16-alpha.
- o Major bugfixes (asserts, crashes, leaks):
- - Prevent the get_freelists() function from running off the end of
- the list of freelists if it somehow gets an unrecognized
- allocation. Fixes bug 8844; bugfix on 0.2.0.16-alpha. Reported by
- eugenis.
- - Avoid a memory leak where we would leak a consensus body when we
- find that a consensus which we couldn't previously verify due to
- missing certificates is now verifiable. Fixes bug 8719; bugfix
- on 0.2.0.10-alpha.
- - If we are unable to save a microdescriptor to the journal, do not
- drop it from memory and then reattempt downloading it. Fixes bug
- 9645; bugfix on 0.2.2.6-alpha.
- - Fix an assertion failure that would occur when disabling the
- ORPort setting on a running Tor process while accounting was
- enabled. Fixes bug 6979; bugfix on 0.2.2.18-alpha.
- - Avoid an assertion failure on OpenBSD (and perhaps other BSDs)
- when an exit connection with optimistic data succeeds immediately
- rather than returning EINPROGRESS. Fixes bug 9017; bugfix on
- 0.2.3.1-alpha.
- - Fix a memory leak that would occur whenever a configuration
- option changed. Fixes bug 8718; bugfix on 0.2.3.3-alpha.
- o Major bugfixes (relay rate limiting):
- - When a TLS write is partially successful but incomplete, remember
- that the flushed part has been flushed, and notice that bytes were
- actually written. Reported and fixed pseudonymously. Fixes bug 7708;
- bugfix on Tor 0.1.0.5-rc.
- - Raise the default BandwidthRate/BandwidthBurst values from 5MB/10MB
- to 1GB/1GB. The previous defaults were intended to be "basically
- infinite", but it turns out they're now limiting our 100mbit+
- relays and bridges. Fixes bug 6605; bugfix on 0.2.0.10-alpha (the
- last time we raised it).
- - No longer stop reading or writing on cpuworker connections when
- our rate limiting buckets go empty. Now we should handle circuit
- handshake requests more promptly. Resolves bug 9731.
- o Major bugfixes (client-side privacy):
- - When we mark a circuit as unusable for new circuits, have it
- continue to be unusable for new circuits even if MaxCircuitDirtiness
- is increased too much at the wrong time, or the system clock jumps
- backwards. Fixes bug 6174; bugfix on 0.0.2pre26.
- - If ClientDNSRejectInternalAddresses ("do not believe DNS queries
- which have resolved to internal addresses") is set, apply that
- rule to IPv6 as well. Fixes bug 8475; bugfix on 0.2.0.7-alpha.
- - When an exit relay rejects a stream with reason "exit policy", but
- we only know an exit policy summary (e.g. from the microdesc
- consensus) for it, do not mark the relay as useless for all exiting.
- Instead, mark just the circuit as unsuitable for that particular
- address. Fixes part of bug 7582; bugfix on 0.2.3.2-alpha.
- o Major bugfixes (stream isolation):
- - Allow applications to get proper stream isolation with
- IsolateSOCKSAuth. Many SOCKS5 clients that want to offer
- username/password authentication also offer "no authentication". Tor
- had previously preferred "no authentication", so the applications
- never actually sent Tor their auth details. Now Tor selects
- username/password authentication if it's offered. You can disable
- this behavior on a per-SOCKSPort basis via PreferSOCKSNoAuth. Fixes
- bug 8117; bugfix on 0.2.3.3-alpha.
- - Follow the socks5 protocol when offering username/password
- authentication. The fix for bug 8117 exposed this bug, and it
- turns out real-world applications like Pidgin do care. Bugfix on
- 0.2.3.2-alpha; fixes bug 8879.
- o Major bugfixes (client circuit building):
- - Alter circuit build timeout measurement to start at the point
- where we begin the CREATE/CREATE_FAST step (as opposed to circuit
- initialization). This should make our timeout measurements more
- uniform. Previously, we were sometimes including ORconn setup time
- in our circuit build time measurements. Should resolve bug 3443.
- - If the circuit build timeout logic is disabled (via the consensus,
- or because we are an authority), then don't build testing circuits.
- Fixes bug 9657; bugfix on 0.2.2.14-alpha.
- o Major bugfixes (client-side DNS):
- - Turn off the client-side DNS cache by default. Updating and using
- the DNS cache is now configurable on a per-client-port
- level. SOCKSPort, DNSPort, etc lines may now contain
- {No,}Cache{IPv4,IPv6,}DNS lines to indicate that we shouldn't
- cache these types of DNS answers when we receive them from an
- exit node in response to an application request on this port, and
- {No,}UseCached{IPv4,IPv6,DNS} lines to indicate that if we have
- cached DNS answers of these types, we shouldn't use them. It's
- potentially risky to use cached DNS answers at the client, since
- doing so can indicate to one exit what answers we've gotten
- for DNS lookups in the past. With IPv6, this becomes especially
- problematic. Using cached DNS answers for requests on the same
- circuit would present less linkability risk, since all traffic
- on a circuit is already linkable, but it would also provide
- little performance benefit: the exit node caches DNS replies
- too. Implements a simplified version of Proposal 205. Implements
- ticket 7570.
- o Major bugfixes (hidden service privacy):
- - Limit hidden service descriptors to at most ten introduction
- points, to slow one kind of guard enumeration. Fixes bug 9002;
- bugfix on 0.1.1.11-alpha.
- o Major bugfixes (directory fetching):
- - If the time to download the next old-style networkstatus is in
- the future, do not decline to consider whether to download the
- next microdescriptor networkstatus. Fixes bug 9564; bugfix on
- 0.2.3.14-alpha.
- - We used to always request authority certificates by identity digest,
- meaning we'd get the newest one even when we wanted one with a
- different signing key. Then we would complain about being given
- a certificate we already had, and never get the one we really
- wanted. Now we use the "fp-sk/" resource as well as the "fp/"
- resource to request the one we want. Fixes bug 5595; bugfix on
- 0.2.0.8-alpha.
- o Major bugfixes (bridge reachability):
- - Bridges now send AUTH_CHALLENGE cells during their v3 handshakes;
- previously they did not, which prevented them from receiving
- successful connections from relays for self-test or bandwidth
- testing. Also, when a relay is extending a circuit to a bridge,
- it needs to send a NETINFO cell, even when the bridge hasn't sent
- an AUTH_CHALLENGE cell. Fixes bug 9546; bugfix on 0.2.3.6-alpha.
- o Major bugfixes (control interface):
- - When receiving a new configuration file via the control port's
- LOADCONF command, do not treat the defaults file as absent.
- Fixes bug 9122; bugfix on 0.2.3.9-alpha.
- o Major bugfixes (directory authorities):
- - Stop marking every relay as having been down for one hour every
- time we restart a directory authority. These artificial downtimes
- were messing with our Stable and Guard flag calculations. Fixes
- bug 8218 (introduced by the fix for 1035). Bugfix on 0.2.2.23-alpha.
- - When computing directory thresholds, ignore any rejected-as-sybil
- nodes during the computation so that they can't influence Fast,
- Guard, etc. (We should have done this for proposal 109.) Fixes
- bug 8146.
- - When marking a node as a likely sybil, reset its uptime metrics
- to zero, so that it cannot time towards getting marked as Guard,
- Stable, or HSDir. (We should have done this for proposal 109.) Fixes
- bug 8147.
- - Fix a bug in the voting algorithm that could yield incorrect results
- when a non-naming authority declared too many flags. Fixes bug 9200;
- bugfix on 0.2.0.3-alpha.
- o Internal abstraction features:
- - Introduce new channel_t abstraction between circuits and
- or_connection_t to allow for implementing alternate OR-to-OR
- transports. A channel_t is an abstract object which can either be a
- cell-bearing channel, which is responsible for authenticating and
- handshaking with the remote OR and transmitting cells to and from
- it, or a listening channel, which spawns new cell-bearing channels
- at the request of remote ORs. Implements part of ticket 6465.
- - Make a channel_tls_t subclass of channel_t, adapting it to the
- existing or_connection_t code. The V2/V3 protocol handshaking
- code which formerly resided in command.c has been moved below the
- channel_t abstraction layer and may be found in channeltls.c now.
- Implements the rest of ticket 6465.
- - Introduce new circuitmux_t storing the queue of circuits for
- a channel; this encapsulates and abstracts the queue logic and
- circuit selection policy, and allows the latter to be overridden
- easily by switching out a policy object. The existing EWMA behavior
- is now implemented as a circuitmux_policy_t. Resolves ticket 6816.
- o New build requirements:
- - Tor now requires OpenSSL 0.9.8 or later. OpenSSL 1.0.0 or later is
- strongly recommended.
- - Tor maintainers now require Automake version 1.9 or later to build
- Tor from the Git repository. (Automake is not required when building
- from a source distribution.)
- o Minor features (protocol):
- - No longer include the "opt" prefix when generating routerinfos
- or v2 directories: it has been needless since Tor 0.1.2. Closes
- ticket 5124.
- - Reject EXTEND cells sent to nonexistent streams. According to the
- spec, an EXTEND cell sent to _any_ nonzero stream ID is invalid, but
- we were only checking for stream IDs that were currently in use.
- Found while hunting for more instances of bug 6271. Bugfix on
- 0.0.2pre8, which introduced incremental circuit construction.
- - Tor relays and clients now support a better CREATE/EXTEND cell
- format, allowing the sender to specify multiple address, identity,
- and handshake types. Implements Robert Ransom's proposal 200;
- closes ticket 7199.
- - Reject as invalid most directory objects containing a NUL.
- Belt-and-suspender fix for bug 8037.
- o Minor features (security):
- - Clear keys and key-derived material left on the stack in
- rendservice.c and rendclient.c. Check return value of
- crypto_pk_write_private_key_to_string() in rend_service_load_keys().
- These fixes should make us more forward-secure against cold-boot
- attacks and the like. Fixes bug 2385.
- - Use our own weak RNG when we need a weak RNG. Windows's rand() and
- Irix's random() only return 15 bits; Solaris's random() returns more
- bits but its RAND_MAX says it only returns 15, and so on. Motivated
- by the fix for bug 7801; bugfix on 0.2.2.20-alpha.
- o Minor features (control protocol):
- - Add a "GETINFO signal/names" control port command. Implements
- ticket 3842.
- - Provide default values for all options via "GETINFO config/defaults".
- Implements ticket 4971.
- - Allow an optional $ before the node identity digest in the
- controller command GETINFO ns/id/<identity>, for consistency with
- md/id/<identity> and desc/id/<identity>. Resolves ticket 7059.
- - Add CACHED keyword to ADDRMAP events in the control protocol
- to indicate whether a DNS result will be cached or not. Resolves
- ticket 8596.
- - Generate bootstrapping status update events correctly when fetching
- microdescriptors. Fixes bug 9927.
- o Minor features (path selection):
- - When deciding whether we have enough descriptors to build circuits,
- instead of looking at raw relay counts, look at which fraction
- of (bandwidth-weighted) paths we're able to build. This approach
- keeps clients from building circuits if their paths are likely to
- stand out statistically. The default fraction of paths needed is
- taken from the consensus directory; you can override it with the
- new PathsNeededToBuildCircuits option. Fixes ticket 5956.
- - When any country code is listed in ExcludeNodes or ExcludeExitNodes,
- and we have GeoIP information, also exclude all nodes with unknown
- countries "??" and "A1". This behavior is controlled by the
- new GeoIPExcludeUnknown option: you can make such nodes always
- excluded with "GeoIPExcludeUnknown 1", and disable the feature
- with "GeoIPExcludeUnknown 0". Setting "GeoIPExcludeUnknown auto"
- gets you the default behavior. Implements feature 7706.
- o Minor features (hidden services):
- - Improve circuit build timeout handling for hidden services.
- In particular: adjust build timeouts more accurately depending
- upon the number of hop-RTTs that a particular circuit type
- undergoes. Additionally, launch intro circuits in parallel
- if they timeout, and take the first one to reply as valid.
- - The Tor client now ignores sub-domain components of a .onion
- address. This change makes HTTP "virtual" hosting
- possible: http://foo.aaaaaaaaaaaaaaaa.onion/ and
- http://bar.aaaaaaaaaaaaaaaa.onion/ can be two different websites
- hosted on the same hidden service. Implements proposal 204.
- - Enable Tor to read configuration, state, and key information from
- a FIFO. Previously Tor would only read from files with a positive
- stat.st_size. Code from meejah; fixes bug 6044.
- o Minor features (clients):
- - Teach bridge-using clients to avoid 0.2.2.x bridges when making
- microdescriptor-related dir requests, and only fall back to normal
- descriptors if none of their bridges can handle microdescriptors
- (as opposed to the fix in ticket 4013, which caused them to fall
- back to normal descriptors if *any* of their bridges preferred
- them). Resolves ticket 4994.
- - Tweak tor-fw-helper to accept an arbitrary amount of arbitrary
- TCP ports to forward. In the past it only accepted two ports:
- the ORPort and the DirPort.
- o Minor features (protecting client timestamps):
- - Clients no longer send timestamps in their NETINFO cells. These were
- not used for anything, and they provided one small way for clients
- to be distinguished from each other as they moved from network to
- network or behind NAT. Implements part of proposal 222.
- - Clients now round timestamps in INTRODUCE cells down to the nearest
- 10 minutes. If a new Support022HiddenServices option is set to 0, or
- if it's set to "auto" and the feature is disabled in the consensus,
- the timestamp is sent as 0 instead. Implements part of proposal 222.
- - Stop sending timestamps in AUTHENTICATE cells. This is not such
- a big deal from a security point of view, but it achieves no actual
- good purpose, and isn't needed. Implements part of proposal 222.
- - Reduce down accuracy of timestamps in hidden service descriptors.
- Implements part of proposal 222.
- o Minor features (bridges):
- - Make bridge relays check once a minute for whether their IP
- address has changed, rather than only every 15 minutes. Resolves
- bugs 1913 and 1992.
- - Bridge statistics now count bridge clients connecting over IPv6:
- bridge statistics files now list "bridge-ip-versions" and
- extra-info documents list "geoip6-db-digest". The control protocol
- "CLIENTS_SEEN" and "ip-to-country" queries now support IPv6. Initial
- implementation by "shkoo", addressing ticket 5055.
- - Add a new torrc option "ServerTransportListenAddr" to let bridge
- operators select the address where their pluggable transports will
- listen for connections. Resolves ticket 7013.
- - Randomize the lifetime of our SSL link certificate, so censors can't
- use the static value for filtering Tor flows. Resolves ticket 8443;
- related to ticket 4014 which was included in 0.2.2.33.
- o Minor features (relays):
- - Option OutboundBindAddress can be specified multiple times and
- accepts IPv6 addresses. Resolves ticket 6876.
- o Minor features (IPv6, client side):
- - AutomapHostsOnResolve now supports IPv6 addresses. By default, we
- prefer to hand out virtual IPv6 addresses, since there are more of
- them and we can't run out. To override this behavior and make IPv4
- addresses preferred, set NoPreferIPv6Automap on whatever SOCKSPort
- or DNSPort you're using for resolving. Implements ticket 7571.
- - AutomapHostsOnResolve responses are now randomized, to avoid
- annoying situations where Tor is restarted and applications
- connect to the wrong addresses.
- - Never try more than 1000 times to pick a new virtual address when
- AutomapHostsOnResolve is set. That's good enough so long as we
- aren't close to handing out our entire virtual address space;
- if you're getting there, it's best to switch to IPv6 virtual
- addresses anyway.
- o Minor features (IPv6, relay/authority side):
- - New config option "AuthDirHasIPv6Connectivity 1" that directory
- authorities should set if they have IPv6 connectivity and want to
- do reachability tests for IPv6 relays. Implements feature 5974.
- - A relay with an IPv6 OR port now sends that address in NETINFO
- cells (in addition to its other address). Implements ticket 6364.
- o Minor features (directory authorities):
- - Directory authorities no long accept descriptors for any version of
- Tor before 0.2.2.35, or for any 0.2.3 release before 0.2.3.10-alpha.
- These versions are insecure, unsupported, or both. Implements
- ticket 6789.
- - When directory authorities are computing thresholds for flags,
- never let the threshold for the Fast flag fall below 4096
- bytes. Also, do not consider nodes with extremely low bandwidths
- when deciding thresholds for various directory flags. This change
- should raise our threshold for Fast relays, possibly in turn
- improving overall network performance; see ticket 1854. Resolves
- ticket 8145.
- - Directory authorities now include inside each vote a statement of
- the performance thresholds they used when assigning flags.
- Implements ticket 8151.
- - Add an "ignoring-advertised-bws" boolean to the flag-threshold lines
- in directory authority votes to describe whether they have enough
- measured bandwidths to ignore advertised (relay descriptor)
- bandwidth claims. Resolves ticket 8711.
- o Minor features (path bias detection):
- - Path Use Bias: Perform separate accounting for successful circuit
- use. Keep separate statistics on stream attempt rates versus stream
- success rates for each guard. Provide configurable thresholds to
- determine when to emit log messages or disable use of guards that
- fail too many stream attempts. Resolves ticket 7802.
- - Create three levels of Path Bias log messages, as opposed to just
- two. These are configurable via consensus as well as via the torrc
- options PathBiasNoticeRate, PathBiasWarnRate, PathBiasExtremeRate.
- The default values are 0.70, 0.50, and 0.30 respectively.
- - Separate the log message levels from the decision to drop guards,
- which also is available via torrc option PathBiasDropGuards.
- PathBiasDropGuards still defaults to 0 (off).
- - Deprecate PathBiasDisableRate in favor of PathBiasDropGuards
- in combination with PathBiasExtremeRate.
- - Increase the default values for PathBiasScaleThreshold and
- PathBiasCircThreshold from (200, 20) to (300, 150).
- - Add in circuit usage accounting to path bias. If we try to use a
- built circuit but fail for any reason, it counts as path bias.
- Certain classes of circuits where the adversary gets to pick your
- destination node are exempt from this accounting. Usage accounting
- can be specifically disabled via consensus parameter or torrc.
- - Convert all internal path bias state to double-precision floating
- point, to avoid roundoff error and other issues.
- - Only record path bias information for circuits that have completed
- *two* hops. Assuming end-to-end tagging is the attack vector, this
- makes us more resilient to ambient circuit failure without any
- detection capability loss.
- o Minor features (build):
- - Tor now builds correctly on Bitrig, an OpenBSD fork. Patch from
- dhill. Resolves ticket 6982.
- - Compile on win64 using mingw64. Fixes bug 7260; patches from
- "yayooo".
- - Work correctly on Unix systems where EAGAIN and EWOULDBLOCK are
- separate error codes; or at least, don't break for that reason.
- Fixes bug 7935. Reported by "oftc_must_be_destroyed".
- o Build improvements (autotools):
- - Warn if building on a platform with an unsigned time_t: there
- are too many places where Tor currently assumes that time_t can
- hold negative values. We'd like to fix them all, but probably
- some will remain.
- - Do not report status verbosely from autogen.sh unless the -v flag
- is specified. Fixes issue 4664. Patch from Onizuka.
- - Detect and reject attempts to build Tor with threading support
- when OpenSSL has been compiled without threading support.
- Fixes bug 6673.
- - Try to detect if we are ever building on a platform where
- memset(...,0,...) does not set the value of a double to 0.0. Such
- platforms are permitted by the C standard, though in practice
- they're pretty rare (since IEEE 754 is nigh-ubiquitous). We don't
- currently support them, but it's better to detect them and fail
- than to perform erroneously.
- - We no longer warn so much when generating manpages from their
- asciidoc source.
- - Use Ville Laurikari's implementation of AX_CHECK_SIGN() to determine
- the signs of types during autoconf. This is better than our old
- approach, which didn't work when cross-compiling.
- o Minor features (log messages, warnings):
- - Detect when we're running with a version of OpenSSL other than the
- one we compiled with. This conflict has occasionally given people
- hard-to-track-down errors.
- - Warn users who run hidden services on a Tor client with
- UseEntryGuards disabled that their hidden services will be
- vulnerable to http://freehaven.net/anonbib/#hs-attack06 (the
- attack which motivated Tor to support entry guards in the first
- place). Resolves ticket 6889.
- - Warn when we are binding low ports when hibernation is enabled;
- previously we had warned when we were _advertising_ low ports with
- hibernation enabled. Fixes bug 7285; bugfix on 0.2.3.9-alpha.
- - Issue a warning when running with the bufferevents backend enabled.
- It's still not stable, and people should know that they're likely
- to hit unexpected problems. Closes ticket 9147.
- o Minor features (log messages, notices):
- - Refactor resolve_my_address() so it returns the method by which we
- decided our public IP address (explicitly configured, resolved from
- explicit hostname, guessed from interfaces, learned by gethostname).
- Now we can provide more helpful log messages when a relay guesses
- its IP address incorrectly (e.g. due to unexpected lines in
- /etc/hosts). Resolves ticket 2267.
- - Track how many "TAP" and "NTor" circuit handshake requests we get,
- and how many we complete, and log it every hour to help relay
- operators follow trends in network load. Addresses ticket 9658.
- o Minor features (log messages, diagnostics):
- - If we fail to free a microdescriptor because of bug 7164, log
- the filename and line number from which we tried to free it.
- - We compute the overhead from passing onionskins back and forth to
- cpuworkers, and report it when dumping statistics in response to
- SIGUSR1. Supports ticket 7291.
- - Add another diagnostic to the heartbeat message: track and log
- overhead that TLS is adding to the data we write. If this is
- high, we are sending too little data to SSL_write at a time.
- Diagnostic for bug 7707.
- - Log packaged cell fullness as part of the heartbeat message.
- Diagnosis to try to determine the extent of bug 7743.
- - Add more detail to a log message about relaxed timeouts, to help
- track bug 7799.
- - When learning a fingerprint for a bridge, log its corresponding
- transport type. Implements ticket 7896.
- - Warn more aggressively when flushing microdescriptors to a
- microdescriptor cache fails, in an attempt to mitigate bug 8031,
- or at least make it more diagnosable.
- - Improve the log message when "Bug/attack: unexpected sendme cell
- from client" occurs, to help us track bug 8093.
- - Improve debugging output to help track down bug 8185 ("Bug:
- outgoing relay cell has n_chan==NULL. Dropping.")
- o Minor features (log messages, quieter bootstrapping):
- - Log fewer lines at level "notice" about our OpenSSL and Libevent
- versions and capabilities when everything is going right. Resolves
- part of ticket 6736.
- - Omit the first heartbeat log message, because it never has anything
- useful to say, and it clutters up the bootstrapping messages.
- Resolves ticket 6758.
- - Don't log about reloading the microdescriptor cache at startup. Our
- bootstrap warnings are supposed to tell the user when there's a
- problem, and our bootstrap notices say when there isn't. Resolves
- ticket 6759; bugfix on 0.2.2.6-alpha.
- - Don't log "I learned some more directory information" when we're
- reading cached directory information. Reserve it for when new
- directory information arrives in response to a fetch. Resolves
- ticket 6760.
- - Don't complain about bootstrapping problems while hibernating.
- These complaints reflect a general code problem, but not one
- with any problematic effects (no connections are actually
- opened). Fixes part of bug 7302; bugfix on 0.2.3.2-alpha.
- o Minor features (testing):
- - In our testsuite, create temporary directories with a bit more
- entropy in their name to make name collisions less likely. Fixes
- bug 8638.
- - Add benchmarks for DH (1024-bit multiplicative group) and ECDH
- (P-256) Diffie-Hellman handshakes to src/or/bench.
- - Add benchmark functions to test onion handshake performance.
- o Renamed options:
- - The DirServer option is now DirAuthority, for consistency with
- current naming patterns. You can still use the old DirServer form.
- o Minor bugfixes (protocol):
- - Fix the handling of a TRUNCATE cell when it arrives while the
- circuit extension is in progress. Fixes bug 7947; bugfix on 0.0.7.1.
- - When a Tor client gets a "truncated" relay cell, the first byte of
- its payload specifies why the circuit was truncated. We were
- ignoring this 'reason' byte when tearing down the circuit, resulting
- in the controller not being told why the circuit closed. Now we
- pass the reason from the truncated cell to the controller. Bugfix
- on 0.1.2.3-alpha; fixes bug 7039.
- - Fix a misframing issue when reading the version numbers in a
- VERSIONS cell. Previously we would recognize [00 01 00 02] as
- 'version 1, version 2, and version 0x100', when it should have
- only included versions 1 and 2. Fixes bug 8059; bugfix on
- 0.2.0.10-alpha. Reported pseudonymously.
- - Make the format and order of STREAM events for DNS lookups
- consistent among the various ways to launch DNS lookups. Fixes
- bug 8203; bugfix on 0.2.0.24-rc. Patch by "Desoxy".
- o Minor bugfixes (syscalls and disk interaction):
- - Always check the return values of functions fcntl() and
- setsockopt(). We don't believe these are ever actually failing in
- practice, but better safe than sorry. Also, checking these return
- values should please analysis tools like Coverity. Patch from
- 'flupzor'. Fixes bug 8206; bugfix on all versions of Tor.
- - Avoid double-closing the listener socket in our socketpair()
- replacement (used on Windows) in the case where the addresses on
- our opened sockets don't match what we expected. Fixes bug 9400;
- bugfix on 0.0.2pre7. Found by Coverity.
- - Correctly store microdescriptors and extrainfo descriptors that
- include an internal NUL byte. Fixes bug 8037; bugfix on
- 0.2.0.1-alpha. Bug reported by "cypherpunks".
- - If for some reason we fail to write a microdescriptor while
- rebuilding the cache, do not let the annotations from that
- microdescriptor linger in the cache file, and do not let the
- microdescriptor stay recorded as present in its old location.
- Fixes bug 9047; bugfix on 0.2.2.6-alpha.
- - Use direct writes rather than stdio when building microdescriptor
- caches, in an attempt to mitigate bug 8031, or at least make it
- less common.
- o Minor fixes (config options):
- - Warn and fail if a server is configured not to advertise any
- ORPorts at all. (We need *something* to put in our descriptor,
- or we just won't work.)
- - Behave correctly when the user disables LearnCircuitBuildTimeout
- but doesn't tell us what they would like the timeout to be. Fixes
- bug 6304; bugfix on 0.2.2.14-alpha.
- - Rename the (internal-use-only) UsingTestingNetworkDefaults option
- to start with a triple-underscore so the controller won't touch it.
- Patch by Meejah. Fixes bug 3155. Bugfix on 0.2.2.23-alpha.
- - Rename the (testing-use-only) _UseFilteringSSLBufferevents option
- so it doesn't start with _. Fixes bug 3155. Bugfix on 0.2.3.1-alpha.
- - When autodetecting the number of CPUs, use the number of available
- CPUs in preference to the number of configured CPUs. Inform the
- user if this reduces the number of available CPUs. Fixes bug 8002;
- bugfix on 0.2.3.1-alpha.
- - Command-line option "--version" implies "--quiet". Fixes bug 6997.
- - Make it an error when you set EntryNodes but disable UseGuardNodes,
- since it will (surprisingly to some users) ignore EntryNodes. Fixes
- bug 8180; bugfix on 0.2.3.11-alpha.
- - Avoid overflows when the user sets MaxCircuitDirtiness to a
- ridiculously high value, by imposing a (ridiculously high) 30-day
- maximum on MaxCircuitDirtiness.
- o Minor bugfixes (control protocol):
- - Stop sending a stray "(null)" in some cases for the server status
- "EXTERNAL_ADDRESS" controller event. Resolves bug 8200; bugfix
- on 0.1.2.6-alpha.
- - The ADDRMAP command can no longer generate an ill-formed error
- code on a failed MAPADDRESS. It now says "internal" rather than
- an English sentence fragment with spaces in the middle. Bugfix on
- Tor 0.2.0.19-alpha.
- o Minor bugfixes (clients / edges):
- - When we receive a RELAY_END cell with the reason DONE, or with no
- reason, before receiving a RELAY_CONNECTED cell, report the SOCKS
- status as "connection refused". Previously we reported these cases
- as success but then immediately closed the connection. Fixes bug
- 7902; bugfix on 0.1.0.1-rc. Reported by "oftc_must_be_destroyed".
- - If the guard we choose first doesn't answer, we would try the
- second guard, but once we connected to the second guard we would
- abandon it and retry the first one, slowing down bootstrapping.
- The fix is to treat all our initially chosen guards as acceptable
- to use. Fixes bug 9946; bugfix on 0.1.1.11-alpha.
- - When choosing which stream on a formerly stalled circuit to wake
- first, make better use of the platform's weak RNG. Previously,
- we had been using the % ("modulo") operator to try to generate a
- 1/N chance of picking each stream, but this behaves badly with
- many platforms' choice of weak RNG. Fixes bug 7801; bugfix on
- 0.2.2.20-alpha.
- o Minor bugfixes (path bias detection):
- - If the state file's path bias counts are invalid (presumably from a
- buggy Tor prior to 0.2.4.10-alpha), make them correct. Also add
- additional checks and log messages to the scaling of Path Bias
- counts, in case there still are remaining issues with scaling.
- Should help resolve bug 8235.
- - Prevent rounding error in path bias counts when scaling
- them down, and use the correct scale factor default. Also demote
- some path bias related log messages down a level and make others
- less scary sounding. Fixes bug 6647. Bugfix on 0.2.3.17-beta.
- - Remove a source of rounding error during path bias count scaling;
- don't count cannibalized circuits as used for path bias until we
- actually try to use them; and fix a circuit_package_relay_cell()
- warning message about n_chan==NULL. Fixes bug 7802.
- - Paste the description for PathBias parameters from the man
- page into or.h, so the code documents them too. Fixes bug 7982;
- bugfix on 0.2.3.17-beta.
- o Minor bugfixes (relays):
- - Stop trying to resolve our hostname so often (e.g. every time we
- think about doing a directory fetch). Now we reuse the cached
- answer in some cases. Fixes bugs 1992 (bugfix on 0.2.0.20-rc)
- and 2410 (bugfix on 0.1.2.2-alpha).
- - When examining the list of network interfaces to find our address,
- do not consider non-running or disabled network interfaces. Fixes
- bug 9904; bugfix on 0.2.3.11-alpha. Patch from "hantwister".
- o Minor bugfixes (blocking resistance):
- - Only disable TLS session ticket support when running as a TLS
- server. Now clients will blend better with regular Firefox
- connections. Fixes bug 7189; bugfix on Tor 0.2.3.23-rc.
- o Minor bugfixes (IPv6):
- - Use square brackets around IPv6 addresses in numerous places
- that needed them, including log messages, HTTPS CONNECT proxy
- requests, TransportProxy statefile entries, and pluggable transport
- extra-info lines. Fixes bug 7011; patch by David Fifield.
- o Minor bugfixes (directory authorities):
- - Reject consensus votes with more than 64 known-flags. We aren't even
- close to that limit yet, and our code doesn't handle it correctly.
- Fixes bug 6833; bugfix on 0.2.0.1-alpha.
- - Correctly handle votes with more than 31 flags. Fixes bug 6853;
- bugfix on 0.2.0.3-alpha.
- o Minor bugfixes (memory leaks):
- - Avoid leaking memory if we fail to compute a consensus signature
- or we generate a consensus we can't parse. Bugfix on 0.2.0.5-alpha.
- - Fix a memory leak when receiving headers from an HTTPS proxy. Bugfix
- on 0.2.1.1-alpha; fixes bug 7816.
- - Fix a memory leak during safe-cookie controller authentication.
- Bugfix on 0.2.3.13-alpha; fixes bug 7816.
- - Free some more still-in-use memory at exit, to make hunting for
- memory leaks easier. Resolves bug 7029.
- o Minor bugfixes (code correctness):
- - Increase the width of the field used to remember a connection's
- link protocol version to two bytes. Harmless for now, since the
- only currently recognized versions are one byte long. Reported
- pseudonymously. Fixes bug 8062; bugfix on 0.2.0.10-alpha.
- - Fix a crash when debugging unit tests on Windows: deallocate a
- shared library with FreeLibrary, not CloseHandle. Fixes bug 7306;
- bugfix on 0.2.2.17-alpha. Reported by "ultramage".
- - When detecting the largest possible file descriptor (in order to
- close all file descriptors when launching a new program), actually
- use _SC_OPEN_MAX. The old code for doing this was very, very broken.
- Fixes bug 8209; bugfix on 0.2.3.1-alpha. Found by Coverity; this
- is CID 743383.
- - Avoid a crash if we fail to generate an extrainfo descriptor.
- Fixes bug 8208; bugfix on 0.2.3.16-alpha. Found by Coverity;
- this is CID 718634.
- - Avoid an off-by-one error when checking buffer boundaries when
- formatting the exit status of a pluggable transport helper.
- This is probably not an exploitable bug, but better safe than
- sorry. Fixes bug 9928; bugfix on 0.2.3.18-rc. Bug found by
- Pedro Ribeiro.
- - Get rid of a couple of harmless clang warnings, where we compared
- enums to ints. These warnings are newly introduced in clang 3.2.
- o Minor bugfixes (code cleanliness):
- - Avoid use of reserved identifiers in our C code. The C standard
- doesn't like us declaring anything that starts with an
- underscore, so let's knock it off before we get in trouble. Fix
- for bug 1031; bugfix on the first Tor commit.
- - Fix round_to_power_of_2() so it doesn't invoke undefined behavior
- with large values. This situation was untriggered, but nevertheless
- incorrect. Fixes bug 6831; bugfix on 0.2.0.1-alpha.
- - Fix an impossible buffer overrun in the AES unit tests. Fixes
- bug 8845; bugfix on 0.2.0.7-alpha. Found by eugenis.
- - Fix handling of rendezvous client authorization types over 8.
- Fixes bug 6861; bugfix on 0.2.1.5-alpha.
- - Remove a couple of extraneous semicolons that were upsetting the
- cparser library. Patch by Christian Grothoff. Fixes bug 7115;
- bugfix on 0.2.2.1-alpha.
- - When complaining about a client port on a public address, log
- which address we're complaining about. Fixes bug 4020; bugfix on
- 0.2.3.3-alpha. Patch by Tom Fitzhenry.
- o Minor bugfixes (log messages, warnings):
- - If we encounter a write failure on a SOCKS connection before we
- finish our SOCKS handshake, don't warn that we closed the
- connection before we could send a SOCKS reply. Fixes bug 8427;
- bugfix on 0.1.0.1-rc.
- - Fix a directory authority warn caused when we have a large amount
- of badexit bandwidth. Fixes bug 8419; bugfix on 0.2.2.10-alpha.
- - Downgrade "Failed to hand off onionskin" messages to "debug"
- severity, since they're typically redundant with the "Your computer
- is too slow" messages. Fixes bug 7038; bugfix on 0.2.2.16-alpha.
- - Avoid spurious warnings when configuring multiple client ports of
- which only some are nonlocal. Previously, we had claimed that some
- were nonlocal when in fact they weren't. Fixes bug 7836; bugfix on
- 0.2.3.3-alpha.
- o Minor bugfixes (log messages, other):
- - Fix log messages and comments to avoid saying "GMT" when we mean
- "UTC". Fixes bug 6113.
- - When rejecting a configuration because we were unable to parse a
- quoted string, log an actual error message. Fixes bug 7950; bugfix
- on 0.2.0.16-alpha.
- - Correctly recognize that [::1] is a loopback address. Fixes
- bug 8377; bugfix on 0.2.1.3-alpha.
- - Don't log inappropriate heartbeat messages when hibernating: a
- hibernating node is _expected_ to drop out of the consensus,
- decide it isn't bootstrapped, and so forth. Fixes bug 7302;
- bugfix on 0.2.3.1-alpha.
- - Eliminate several instances where we use "Nickname=ID" to refer to
- nodes in logs. Use "Nickname (ID)" instead. (Elsewhere, we still use
- "$ID=Nickname", which is also acceptable.) Fixes bug 7065. Bugfix
- on 0.2.3.21-rc.
- o Minor bugfixes (build):
- - Fix some bugs in tor-fw-helper-natpmp when trying to build and
- run it on Windows. More bugs likely remain. Patch from Gisle Vanem.
- Fixes bug 7280; bugfix on 0.2.3.1-alpha.
- o Documentation fixes:
- - Make the torify manpage no longer refer to tsocks; torify hasn't
- supported tsocks since 0.2.3.14-alpha.
- - Make the tor manpage no longer reference tsocks.
- - Fix the GeoIPExcludeUnknown documentation to refer to
- ExcludeExitNodes rather than the currently nonexistent
- ExcludeEntryNodes. Spotted by "hamahangi" on tor-talk.
- - Resolve a typo in torrc.sample.in. Fixes bug 6819; bugfix on
- 0.2.3.14-alpha.
- - Say "KBytes" rather than "KB" in the man page (for various values
- of K), to further reduce confusion about whether Tor counts in
- units of memory or fractions of units of memory. Resolves ticket 7054.
- - Update tor-fw-helper.1.txt and tor-fw-helper.c to make option
- names match. Fixes bug 7768.
- - Fix the documentation of HeartbeatPeriod to say that the heartbeat
- message is logged at notice, not at info.
- - Clarify the usage and risks of setting the ContactInfo torrc line
- for your relay or bridge. Resolves ticket 9854.
- - Add anchors to the manpage so we can link to the html version of
- the documentation for specific options. Resolves ticket 9866.
- - Replace remaining references to DirServer in man page and
- log entries. Resolves ticket 10124.
- o Removed features:
- - Stop exporting estimates of v2 and v3 directory traffic shares
- in extrainfo documents. They were unneeded and sometimes inaccurate.
- Also stop exporting any v2 directory request statistics. Resolves
- ticket 5823.
- - Drop support for detecting and warning about versions of Libevent
- before 1.3e. Nothing reasonable ships with them any longer; warning
- the user about them shouldn't be needed. Resolves ticket 6826.
- - Now that all versions before 0.2.2.x are disallowed, we no longer
- need to work around their missing features. Remove a bunch of
- compatibility code.
- o Removed files:
- - The tor-tsocks.conf is no longer distributed or installed. We
- recommend that tsocks users use torsocks instead. Resolves
- ticket 8290.
- - Remove some of the older contents of doc/ as obsolete; move others
- to torspec.git. Fixes bug 8965.
- o Code simplification:
- - Avoid using character buffers when constructing most directory
- objects: this approach was unwieldy and error-prone. Instead,
- build smartlists of strings, and concatenate them when done.
- - Rename "isin" functions to "contains", for grammar. Resolves
- ticket 5285.
- - Rename Tor's logging function log() to tor_log(), to avoid conflicts
- with the natural logarithm function from the system libm. Resolves
- ticket 7599.
- - Start using OpenBSD's implementation of queue.h, so that we don't
- need to hand-roll our own pointer and list structures whenever we
- need them. (We can't rely on a sys/queue.h, since some operating
- systems don't have them, and the ones that do have them don't all
- present the same extensions.)
- - Start using OpenBSD's implementation of queue.h (originally by
- Niels Provos).
- - Enhance our internal sscanf replacement so that we can eliminate
- the last remaining uses of the system sscanf. (Though those uses
- of sscanf were safe, sscanf itself is generally error prone, so
- we want to eliminate when we can.) Fixes ticket 4195 and Coverity
- CID 448.
- - Replace all calls to snprintf() outside of src/ext with
- tor_snprintf(). Also remove the #define to replace snprintf with
- _snprintf on Windows; they have different semantics, and all of
- our callers should be using tor_snprintf() anyway. Fixes bug 7304.
- o Refactoring:
- - Add a wrapper function for the common "log a message with a
- rate-limit" case.
- - Split the onion.c file into separate modules for the onion queue
- and the different handshakes it supports.
- - Move the client-side address-map/virtual-address/DNS-cache code
- out of connection_edge.c into a new addressmap.c module.
- - Move the entry node code from circuitbuild.c to its own file.
- - Move the circuit build timeout tracking code from circuitbuild.c
- to its own file.
- - Source files taken from other packages now reside in src/ext;
- previously they were scattered around the rest of Tor.
- - Move the generic "config" code into a new file, and have "config.c"
- hold only torrc- and state-related code. Resolves ticket 6823.
- - Move the core of our "choose a weighted element at random" logic
- into its own function, and give it unit tests. Now the logic is
- testable, and a little less fragile too.
- - Move ipv6_preferred from routerinfo_t to node_t. Addresses bug 4620.
- - Move last_reachable and testing_since from routerinfo_t to node_t.
- Implements ticket 5529.
- - Add replaycache_t structure, functions and unit tests, then refactor
- rend_service_introduce() to be more clear to read, improve, debug,
- and test. Resolves bug 6177.
- o Removed code:
- - Remove some now-needless code that tried to aggressively flush
- OR connections as data was added to them. Since 0.2.0.1-alpha, our
- cell queue logic has saved us from the failure mode that this code
- was supposed to prevent. Removing this code will limit the number
- of baroque control flow paths through Tor's network logic. Reported
- pseudonymously on IRC. Fixes bug 6468; bugfix on 0.2.0.1-alpha.
- - Remove unused code for parsing v1 directories and "running routers"
- documents. Fixes bug 6887.
- - Remove the marshalling/unmarshalling code for sending requests to
- cpuworkers over a socket, and instead just send structs. The
- recipient will always be the same Tor binary as the sender, so
- any encoding is overkill.
- - Remove the testing_since field of node_t, which hasn't been used
- for anything since 0.2.0.9-alpha.
- - Finally remove support for malloc_good_size and malloc_usable_size.
- We had hoped that these functions would let us eke a little more
- memory out of our malloc implementation. Unfortunately, the only
- implementations that provided these functions are also ones that
- are already efficient about not overallocation: they never got us
- more than 7 or so bytes per allocation. Removing them saves us a
- little code complexity and a nontrivial amount of build complexity.
- Changes in version 0.2.3.25 - 2012-11-19
- The Tor 0.2.3 release series is dedicated to the memory of Len "rabbi"
- Sassaman (1980-2011), a long-time cypherpunk, anonymity researcher,
- Mixmaster maintainer, Pynchon Gate co-designer, CodeCon organizer,
- programmer, and friend. Unstinting in his dedication to the cause of
- freedom, he inspired and helped many of us as we began our work on
- anonymity, and inspires us still. Please honor his memory by writing
- software to protect people's freedoms, and by helping others to do so.
- Tor 0.2.3.25, the first stable release in the 0.2.3 branch, features
- significantly reduced directory overhead (via microdescriptors),
- enormous crypto performance improvements for fast relays on new
- enough hardware, a new v3 TLS handshake protocol that can better
- resist fingerprinting, support for protocol obfuscation plugins (aka
- pluggable transports), better scalability for hidden services, IPv6
- support for bridges, performance improvements like allowing clients
- to skip the first round-trip on the circuit ("optimistic data") and
- refilling token buckets more often, a new "stream isolation" design
- to isolate different applications on different circuits, and many
- stability, security, and privacy fixes.
- Major features (v3 directory protocol):
- - Clients now use microdescriptors instead of regular descriptors
- to build circuits. Microdescriptors are authority-generated
- summaries of regular descriptors' contents, designed to change very
- rarely (see proposal 158 for details). This feature is designed
- to save bandwidth, especially for clients on slow internet
- connections. Use "UseMicrodescriptors 0" to disable it.
- - Caches now download, cache, and serve microdescriptors, as well
- as multiple "flavors" of the consensus, including a flavor that
- describes microdescriptors.
- o Major features (build hardening):
- - Enable gcc and ld hardening by default. Resolves ticket 5210.
- o Major features (relay scaling):
- - When built to use OpenSSL 1.0.1, and built for an x86 or x86_64
- instruction set, take advantage of OpenSSL's AESNI, bitsliced, or
- vectorized AES implementations as appropriate. These can be much,
- much faster than other AES implementations.
- - When using OpenSSL 1.0.0 or later, use OpenSSL's counter mode
- implementation. It makes AES_CTR about 7% faster than our old one
- (which was about 10% faster than the one OpenSSL used to provide).
- Resolves ticket 4526.
- - Use OpenSSL's EVP interface for AES encryption, so that all AES
- operations can use hardware acceleration (if present). Resolves
- ticket 4442.
- - Unconditionally use OpenSSL's AES implementation instead of our
- old built-in one. OpenSSL's AES has been better for a while, and
- relatively few servers should still be on any version of OpenSSL
- that doesn't have good optimized assembly AES.
- o Major features (blocking resistance):
- - Update TLS cipher list to match Firefox 8 and later. Resolves
- ticket 4744.
- - Remove support for clients falsely claiming to support standard
- ciphersuites that they can actually provide. As of modern OpenSSL
- versions, it's not necessary to fake any standard ciphersuite,
- and doing so prevents us from using better ciphersuites in the
- future, since servers can't know whether an advertised ciphersuite
- is really supported or not. Some hosts -- notably, ones with very
- old versions of OpenSSL or where OpenSSL has been built with ECC
- disabled -- will stand out because of this change; TBB users should
- not be affected. Implements the client side of proposal 198.
- - Implement a new handshake protocol (v3) for authenticating Tors to
- each other over TLS. It should be more resistant to fingerprinting
- than previous protocols, and should require less TLS hacking for
- future Tor implementations. Implements proposal 176.
- - Allow variable-length padding cells, to disguise the length of
- Tor's TLS records. Implements part of proposal 184.
- - While we're trying to bootstrap, record how many TLS connections
- fail in each state, and report which states saw the most failures
- in response to any bootstrap failures. This feature may speed up
- diagnosis of censorship events. Implements ticket 3116.
- o Major features (pluggable transports):
- - Clients and bridges can now be configured to use a separate
- "transport" proxy. This approach makes the censorship arms race
- easier by allowing bridges to use protocol obfuscation plugins.
- Implements proposal 180 (tickets 2841 and 3472).
- o Major features (DoS resistance):
- - Now that Tor 0.2.0.x is completely deprecated, enable the final
- part of "Proposal 110: Avoiding infinite length circuits" by
- refusing all circuit-extend requests that do not use a relay_early
- cell. This change helps Tor resist a class of denial-of-service
- attacks by limiting the maximum circuit length.
- - Tear down the circuit if we get an unexpected SENDME cell. Clients
- could use this trick to make their circuits receive cells faster
- than our flow control would have allowed, or to gum up the network,
- or possibly to do targeted memory denial-of-service attacks on
- entry nodes. Fixes bug 6252. Bugfix on the 54th commit on Tor --
- from July 2002, before the release of Tor 0.0.0.
- o Major features (hidden services):
- - Adjust the number of introduction points that a hidden service
- will try to maintain based on how long its introduction points
- remain in use and how many introductions they handle. Fixes
- part of bug 3825.
- - Add a "tor2web mode" for clients that want to connect to hidden
- services non-anonymously (and possibly more quickly). As a safety
- measure to try to keep users from turning this on without knowing
- what they are doing, tor2web mode must be explicitly enabled at
- compile time, and a copy of Tor compiled to run in tor2web mode
- cannot be used as a normal Tor client. Implements feature 2553.
- o Major features (IPv6):
- - Clients can now connect to private bridges over IPv6. Bridges
- still need at least one IPv4 address in order to connect to
- other relays. Note that we don't yet handle the case where the
- user has two bridge lines for the same bridge (one IPv4, one
- IPv6). Implements parts of proposal 186.
- o Major features (directory authorities):
- - Use a more secure consensus parameter voting algorithm. Now at
- least three directory authorities or a majority of them must
- vote on a given parameter before it will be included in the
- consensus. Implements proposal 178.
- - Remove the artificially low cutoff of 20KB to guarantee the Fast
- flag. In the past few years the average relay speed has picked
- up, and while the "top 7/8 of the network get the Fast flag" and
- "all relays with 20KB or more of capacity get the Fast flag" rules
- used to have the same result, now the top 7/8 of the network has
- a capacity more like 32KB. Bugfix on 0.2.1.14-rc. Fixes bug 4489.
- o Major features (performance):
- - Exit nodes now accept and queue data on not-yet-connected streams.
- Previously, the client wasn't allowed to send data until the
- stream was connected, which slowed down all connections. This
- change will enable clients to perform a "fast-start" on streams
- and send data without having to wait for a confirmation that the
- stream has opened. Patch from Ian Goldberg; implements the server
- side of Proposal 174.
- - When using an exit relay running 0.2.3.x, clients can now
- "optimistically" send data before the exit relay reports that
- the stream has opened. This saves a round trip when starting
- connections where the client speaks first (such as web browsing).
- This behavior is controlled by a consensus parameter (currently
- disabled). To turn it on or off manually, use the "OptimisticData"
- torrc option. Implements proposal 181; code by Ian Goldberg.
- - Add a new TokenBucketRefillInterval option to refill token buckets
- more frequently than once per second. This should improve network
- performance, alleviate queueing problems, and make traffic less
- bursty. Implements proposal 183; closes ticket 3630. Design by
- Florian Tschorsch and Björn Scheuermann; implementation by
- Florian Tschorsch.
- - Raise the threshold of server descriptors needed (75%) and exit
- server descriptors needed (50%) before we will declare ourselves
- bootstrapped. This will make clients start building circuits a
- little later, but makes the initially constructed circuits less
- skewed and less in conflict with further directory fetches. Fixes
- ticket 3196.
- o Major features (relays):
- - Relays now try regenerating and uploading their descriptor more
- frequently if they are not listed in the consensus, or if the
- version of their descriptor listed in the consensus is too
- old. This fix should prevent situations where a server declines
- to re-publish itself because it has done so too recently, even
- though the authorities decided not to list its recent-enough
- descriptor. Fix for bug 3327.
- o Major features (stream isolation):
- - You can now configure Tor so that streams from different
- applications are isolated on different circuits, to prevent an
- attacker who sees your streams as they leave an exit node from
- linking your sessions to one another. To do this, choose some way
- to distinguish the applications: have them connect to different
- SocksPorts, or have one of them use SOCKS4 while the other uses
- SOCKS5, or have them pass different authentication strings to the
- SOCKS proxy. Then, use the new SocksPort syntax to configure the
- degree of isolation you need. This implements Proposal 171.
- - There's a new syntax for specifying multiple client ports (such as
- SOCKSPort, TransPort, DNSPort, NATDPort): you can now just declare
- multiple *Port entries with full addr:port syntax on each.
- The old *ListenAddress format is still supported, but you can't
- mix it with the new *Port syntax.
- o Major features (bufferevents):
- - Tor can now optionally build with the "bufferevents" buffered IO
- backend provided by Libevent 2. To use this feature, make sure you
- have the latest possible version of Libevent, and pass the
- --enable-bufferevents flag to configure when building Tor from
- source. This feature will make our networking code more flexible,
- let us stack layers on each other, and let us use more efficient
- zero-copy transports where available.
- - Add experimental support for running on Windows with IOCP and no
- kernel-space socket buffers. This feature is controlled by a new
- "UserspaceIOCPBuffers" config option (off by default), which has
- no effect unless Tor has been built with bufferevents enabled,
- you're running on Windows, and you've set "DisableIOCP 0". In the
- long run, this may help solve or mitigate bug 98.
- o Major features (path selection):
- - The EntryNodes option can now include country codes like {de} or IP
- addresses or network masks. Previously we had disallowed these
- options because we didn't have an efficient way to keep the list up
- to date. Addresses ticket 1982, but see bug 2798 for an unresolved
- issue here.
- o Major features (port forwarding):
- - Add support for automatic port mapping on the many home routers
- that support NAT-PMP or UPnP. To build the support code, you'll
- need to have the libnatpnp library and/or the libminiupnpc library,
- and you'll need to enable the feature specifically by passing
- "--enable-upnp" and/or "--enable-natpnp" to ./configure. To turn
- it on, use the new PortForwarding option.
- o Major features (logging):
- - Add a new 'Heartbeat' log message type to periodically log a message
- describing Tor's status at level Notice. This feature is meant for
- operators who log at notice, and want to make sure that their Tor
- server is still working. Implementation by George Kadianakis.
- - Make logging resolution configurable with a new LogTimeGranularity
- option, and change the default from 1 millisecond to 1 second.
- Implements enhancement 1668.
- o Major features (other):
- - New "DisableNetwork" config option to prevent Tor from launching any
- connections or accepting any connections except on a control port.
- Bundles and controllers can set this option before letting Tor talk
- to the rest of the network, for example to prevent any connections
- to a non-bridge address. Packages like Orbot can also use this
- option to instruct Tor to save power when the network is off.
- - Try to use system facilities for enumerating local interface
- addresses, before falling back to our old approach (which was
- binding a UDP socket, and calling getsockname() on it). That
- approach was scaring OS X users whose draconian firewall
- software warned about binding to UDP sockets regardless of
- whether packets were sent. Now we try to use getifaddrs(),
- SIOCGIFCONF, or GetAdaptersAddresses(), depending on what the
- system supports. Resolves ticket 1827.
- - Add experimental support for a "defaults" torrc file to be parsed
- before the regular torrc. Torrc options override the defaults file's
- options in the same way that the command line overrides the torrc.
- The SAVECONF controller command saves only those options which
- differ between the current configuration and the defaults file. HUP
- reloads both files. Implements task 4552.
- o New directory authorities:
- - Add Faravahar (run by Sina Rabbani) as the ninth v3 directory
- authority. Closes ticket 5749.
- o Security/privacy fixes:
- - Avoid read-from-freed-memory and double-free bugs that could occur
- when a DNS request fails while launching it. Fixes bug 6480;
- bugfix on 0.2.0.1-alpha.
- - Reject any attempt to extend to an internal address. Without
- this fix, a router could be used to probe addresses on an internal
- network to see whether they were accepting connections. Fixes bug
- 6710; bugfix on 0.0.8pre1.
- - Close any connection that sends unrecognized junk before the TLS
- handshake. Solves an issue noted in bug 4369.
- - The advertised platform of a relay now includes only its operating
- system's name (e.g., "Linux", "Darwin", "Windows 7"), and not
- its service pack level (for Windows) or its CPU architecture
- (for Unix). Also drop the "git-XYZ" tag in the version. Packagers
- can insert an extra string in the platform line by setting the
- preprocessor variable TOR_BUILD_TAG. Resolves bug 2988.
- - Disable TLS session tickets. OpenSSL's implementation was giving
- our TLS session keys the lifetime of our TLS context objects, when
- perfect forward secrecy would want us to discard anything that
- could decrypt a link connection as soon as the link connection
- was closed. Fixes bug 7139; bugfix on all versions of Tor linked
- against OpenSSL 1.0.0 or later. Found by Florent Daignière.
- - Tor tries to wipe potentially sensitive data after using it, so
- that if some subsequent security failure exposes Tor's memory,
- the damage will be limited. But we had a bug where the compiler
- was eliminating these wipe operations when it decided that the
- memory was no longer visible to a (correctly running) program,
- hence defeating our attempt at defense in depth. We fix that
- by using OpenSSL's OPENSSL_cleanse() operation, which a compiler
- is unlikely to optimize away. Future versions of Tor may use
- a less ridiculously heavy approach for this. Fixes bug 7352.
- Reported in an article by Andrey Karpov.
- o Major bugfixes (crashes and asserts):
- - Avoid a pair of double-free and use-after-mark bugs that can
- occur with certain timings in canceled and re-received DNS
- requests. Fixes bug 6472; bugfix on 0.0.7rc1.
- - Fix a denial of service attack by which any directory authority
- could crash all the others, or by which a single v2 directory
- authority could crash everybody downloading v2 directory
- information. Fixes bug 7191; bugfix on 0.2.0.10-alpha.
- - Fix an assert that directory authorities could trigger on sighup
- during some configuration state transitions. We now don't treat
- it as a fatal error when the new descriptor we just generated in
- init_keys() isn't accepted. Fixes bug 4438; bugfix on 0.2.1.9-alpha.
- - Avoid segfault when starting up having run with an extremely old
- version of Tor and parsing its state file. Fixes bug 6801; bugfix
- on 0.2.2.23-alpha.
- o Major bugfixes (clients):
- - If we are unable to find any exit that supports our predicted ports,
- stop calling them predicted, so that we don't loop and build
- hopeless circuits indefinitely. Fixes bug 3296; bugfix on 0.0.9pre6,
- which introduced predicted ports.
- - Check at each new consensus whether our entry guards were picked
- long enough ago that we should rotate them. Previously, we only
- did this check at startup, which could lead to us holding a guard
- indefinitely. Fixes bug 5380; bugfix on 0.2.1.14-rc.
- - When fetching a bridge descriptor from a bridge authority,
- always do so anonymously, whether we have been able to open
- circuits or not. Partial fix for bug 1938; bugfix on 0.2.0.7-alpha.
- This behavior makes it *safer* to use UpdateBridgesFromAuthority,
- but we'll need to wait for bug 6010 before it's actually usable.
- o Major bugfixes (directory voting):
- - Check more thoroughly to prevent a rogue authority from
- double-voting on any consensus directory parameter. Previously,
- authorities would crash in this case if the total number of
- votes for any parameter exceeded the number of active voters,
- but would let it pass otherwise. Partially fixes bug 5786; bugfix
- on 0.2.2.2-alpha.
- - When computing weight parameters, behave more robustly in the
- presence of a bad bwweightscale value. Previously, the authorities
- would crash if they agreed on a sufficiently broken weight_scale
- value; now, they use a reasonable default and carry on. Fixes the
- rest of bug 5786; bugfix on 0.2.2.17-alpha.
- - If authorities are unable to get a v2 consensus document from other
- directory authorities, they no longer fall back to fetching
- them from regular directory caches. Fixes bug 5635; bugfix on
- 0.2.2.26-beta, where routers stopped downloading v2 consensus
- documents entirely.
- o Major bugfixes (relays):
- - Fix a bug handling SENDME cells on nonexistent streams that could
- result in bizarre window values. Report and patch contributed
- pseudonymously. Fixes part of bug 6271. This bug was introduced
- before the first Tor release, in svn commit r152.
- - Don't update the AccountingSoftLimitHitAt state file entry whenever
- tor gets started. This prevents a wrong average bandwidth
- estimate, which would cause relays to always start a new accounting
- interval at the earliest possible moment. Fixes bug 2003; bugfix
- on 0.2.2.7-alpha. Reported by Bryon Eldridge, who also helped
- immensely in tracking this bug down.
- - Fix a possible crash bug when checking for deactivated circuits
- in connection_or_flush_from_first_active_circuit(). Fixes bug 6341;
- bugfix on 0.2.2.7-alpha. Bug report and fix received pseudonymously.
- - Set the SO_REUSEADDR socket option before we call bind() on outgoing
- connections. This change should allow busy exit relays to stop
- running out of available sockets as quickly. Fixes bug 4950;
- bugfix on 0.2.2.26-beta.
- o Major bugfixes (blocking resistance):
- - Bridges no longer include their address in NETINFO cells on outgoing
- OR connections, to allow them to blend in better with clients.
- Removes another avenue for enumerating bridges. Reported by
- "troll_un". Fixes bug 4348; bugfix on 0.2.0.10-alpha, when NETINFO
- cells were introduced.
- - Warn the user when HTTPProxy, but no other proxy type, is
- configured. This can cause surprising behavior: it doesn't send
- all of Tor's traffic over the HTTPProxy -- it sends unencrypted
- directory traffic only. Resolves ticket 4663.
- o Major bugfixes (hidden services):
- - Improve hidden service robustness: when an attempt to connect to
- a hidden service ends, be willing to refetch its hidden service
- descriptors from each of the HSDir relays responsible for them
- immediately. Previously, we would not consider refetching the
- service's descriptors from each HSDir for 15 minutes after the last
- fetch, which was inconvenient if the hidden service was not running
- during the first attempt. Bugfix on 0.2.0.18-alpha; fixes bug 3335.
- - Hidden services now ignore the timestamps on INTRODUCE2 cells.
- They used to check that the timestamp was within 30 minutes
- of their system clock, so they could cap the size of their
- replay-detection cache, but that approach unnecessarily refused
- service to clients with wrong clocks. Bugfix on 0.2.1.6-alpha, when
- the v3 intro-point protocol (the first one which sent a timestamp
- field in the INTRODUCE2 cell) was introduced; fixes bug 3460.
- - When one of a hidden service's introduction points appears to be
- unreachable, stop trying it. Previously, we would keep trying
- to build circuits to the introduction point until we lost the
- descriptor, usually because the user gave up and restarted Tor.
- Fixes part of bug 3825.
- o Changes to default torrc file:
- - Stop listing "socksport 9050" in torrc.sample. We open a socks
- port on 9050 by default anyway, so this should not change anything
- in practice.
- - Stop mentioning the deprecated *ListenAddress options in
- torrc.sample. Fixes bug 5438.
- - Document unit of bandwidth-related options in sample torrc.
- Fixes bug 5621.
- - Fix broken URLs in the sample torrc file, and tell readers about
- the OutboundBindAddress, ExitPolicyRejectPrivate, and
- PublishServerDescriptor options. Addresses bug 4652.
- o Minor features (directory authorities):
- - Consider new, removed or changed IPv6 OR ports a non-cosmetic
- change when the authority is deciding whether to accept a newly
- uploaded descriptor. Implements ticket 6423.
- - Directory authorities are now a little more lenient at accepting
- older router descriptors, or newer router descriptors that don't
- make big changes. This should help ameliorate past and future
- issues where routers think they have uploaded valid descriptors,
- but the authorities don't think so. Fix for ticket 2479.
- - Authority operators can now vote for all relays in a given
- set of countries to be BadDir/BadExit/Invalid/Rejected.
- - Provide two consensus parameters (FastFlagMinThreshold and
- FastFlagMaxThreshold) to control the range of allowable bandwidths
- for the Fast directory flag. These allow authorities to run
- experiments on appropriate requirements for being a "Fast" node.
- The AuthDirFastGuarantee config value still applies. Implements
- ticket 3946.
- o Minor features (bridges / bridge authorities):
- - Make bridge SSL certificates a bit more stealthy by using random
- serial numbers, in the same fashion as OpenSSL when generating
- self-signed certificates. Implements ticket 4584.
- - Tag a bridge's descriptor as "never to be sent unencrypted".
- This shouldn't matter, since bridges don't open non-anonymous
- connections to the bridge authority and don't allow unencrypted
- directory connections from clients, but we might as well make
- sure. Closes bug 5139.
- - The Bridge Authority now writes statistics on how many bridge
- descriptors it gave out in total, and how many unique descriptors
- it gave out. It also lists how often the most and least commonly
- fetched descriptors were given out, as well as the median and
- 25th/75th percentile. Implements tickets 4200 and 4294.
- o Minor features (IPv6):
- - Make the code that clients use to detect an address change be
- IPv6-aware, so that it won't fill clients' logs with error
- messages when trying to get the IPv4 address of an IPv6
- connection. Implements ticket 5537.
- - Relays now understand an IPv6 address when they get one from a
- directory server. Resolves ticket 4875.
- o Minor features (hidden services):
- - Expire old or over-used hidden service introduction points.
- Required by fix for bug 3460.
- - Reduce the lifetime of elements of hidden services' Diffie-Hellman
- public key replay-detection cache from 60 minutes to 5 minutes. This
- replay-detection cache is now used only to detect multiple
- INTRODUCE2 cells specifying the same rendezvous point, so we can
- avoid launching multiple simultaneous attempts to connect to it.
- - When a hidden service's introduction point times out, consider
- trying it again during the next attempt to connect to the
- HS. Previously, we would not try it again unless a newly fetched
- descriptor contained it. Required by fixes for bugs 1297 and 3825.
- o Minor features (relays):
- - Relays now include a reason for regenerating their descriptors
- in an HTTP header when uploading to the authorities. This will
- make it easier to debug descriptor-upload issues in the future.
- - Turn on directory request statistics by default and include them in
- extra-info descriptors. Don't break if we have no GeoIP database.
- - Replace files in stats/ rather than appending to them. Now that we
- include statistics in extra-info descriptors, it makes no sense to
- keep old statistics forever. Implements ticket 2930.
- - Relays that set "ConnDirectionStatistics 1" write statistics on the
- bidirectional use of connections to disk every 24 hours.
- - Add a GeoIP file digest to the extra-info descriptor. Implements
- ticket 1883.
- o Minor features (new config options):
- - New config option "DynamicDHGroups" (disabled by default) provides
- each bridge with a unique prime DH modulus to be used during
- SSL handshakes. This option attempts to help against censors
- who might use the Apache DH modulus as a static identifier for
- bridges. Addresses ticket 4548.
- - New config option "DisableDebuggerAttachment" (on by default)
- to prevent basic debugging attachment attempts by other processes.
- Supports Mac OS X and Gnu/Linux. Resolves ticket 3313.
- - Ordinarily, Tor does not count traffic from private addresses (like
- 127.0.0.1 or 10.0.0.1) when calculating rate limits or accounting.
- There is now a new option, CountPrivateBandwidth, to disable this
- behavior. Patch from Daniel Cagara.
- o Minor features (different behavior for old config options):
- - Allow MapAddress directives to specify matches against super-domains,
- as in "MapAddress *.torproject.org *.torproject.org.torserver.exit".
- Implements issue 933.
- - Don't disable the DirPort when we cannot exceed our AccountingMax
- limit during this interval because the effective bandwidthrate is
- low enough. This is useful in a situation where AccountMax is only
- used as an additional safeguard or to provide statistics.
- - Add port 6523 (Gobby) to LongLivedPorts. Patch by intrigeri;
- implements ticket 3439.
- - When configuring a large set of nodes in EntryNodes, and there are
- enough of them listed as Guard so that we don't need to consider
- the non-guard entries, prefer the ones listed with the Guard flag.
- - If you set the NumCPUs option to 0, Tor will now try to detect how
- many CPUs you have. This is the new default behavior.
- - The NodeFamily option -- which let you declare that you want to
- consider nodes to be part of a family whether they list themselves
- that way or not -- now allows IP address ranges and country codes.
- o Minor features (new command-line config behavior):
- - Slightly change behavior of "list" options (that is, config
- options that can appear more than once) when they appear both in
- torrc and on the command line. Previously, the command-line options
- would be appended to the ones from torrc. Now, the command-line
- options override the torrc options entirely. This new behavior
- allows the user to override list options (like exit policies and
- ports to listen on) from the command line, rather than simply
- appending to the list.
- - You can get the old (appending) command-line behavior for "list"
- options by prefixing the option name with a "+".
- - You can remove all the values for a "list" option from the command
- line without adding any new ones by prefixing the option name
- with a "/".
- o Minor features (controller, new events):
- - Extend the control protocol to report flags that control a circuit's
- path selection in CIRC events and in replies to 'GETINFO
- circuit-status'. Implements part of ticket 2411.
- - Extend the control protocol to report the hidden service address
- and current state of a hidden-service-related circuit in CIRC
- events and in replies to 'GETINFO circuit-status'. Implements part
- of ticket 2411.
- - Include the creation time of a circuit in CIRC and CIRC2
- control-port events and the list produced by the 'GETINFO
- circuit-status' control-port command.
- - Add a new CONF_CHANGED event so that controllers can be notified
- of any configuration changes made by other controllers, or by the
- user. Implements ticket 1692.
- - Add a new SIGNAL event to the controller interface so that
- controllers can be notified when Tor handles a signal. Resolves
- issue 1955. Patch by John Brooks.
- o Minor features (controller, new getinfo options):
- - Expose our view of whether we have gone dormant to the controller,
- via a new "GETINFO dormant" value. Torbutton and other controllers
- can use this to avoid doing periodic requests through Tor while
- it's dormant (bug 4718). Resolves ticket 5954.
- - Add a new GETINFO option to get total bytes read and written. Patch
- from pipe, revised by atagar. Resolves ticket 2345.
- - Implement new GETINFO controller fields to provide information about
- the Tor process's pid, euid, username, and resource limits.
- o Minor features (controller, other):
- - Allow controllers to request an event notification whenever a
- circuit is cannibalized or its purpose is changed. Implements
- part of ticket 3457.
- - Use absolute path names when reporting the torrc filename in the
- control protocol, so a controller can more easily find the torrc
- file. Resolves bug 1101.
- - When reporting the path to the cookie file to the controller,
- give an absolute path. Resolves ticket 4881.
- o Minor features (log messages):
- - Add more information to a log statement that might help track down
- bug 4091. If you're seeing "Bug: tor_addr_is_internal() called with a
- non-IP address" messages (or any Bug messages, for that matter!),
- please let us know about it.
- - If EntryNodes are given, but UseEntryGuards is set to 0, warn that
- EntryNodes will have no effect. Resolves issue 2571.
- - Try to make the introductory warning message that Tor prints on
- startup more useful for actually finding help and information.
- Resolves ticket 2474.
- - When the system call to create a listener socket fails, log the
- error message explaining why. This may help diagnose bug 4027.
- o Minor features (other):
- - When we fail to initialize Libevent, retry with IOCP disabled so we
- don't need to turn on multi-threading support in Libevent, which in
- turn requires a working socketpair(). This is a workaround for bug
- 4457, which affects Libevent versions from 2.0.1-alpha through
- 2.0.15-stable.
- - When starting as root and then changing our UID via the User
- control option, and we have a ControlSocket configured, make sure
- that the ControlSocket is owned by the same account that Tor will
- run under. Implements ticket 3421; fix by Jérémy Bobbio.
- - Accept attempts to include a password authenticator in the
- handshake, as supported by SOCKS5. This handles SOCKS clients that
- don't know how to omit a password when authenticating. Resolves
- bug 1666.
- - Check for and recover from inconsistency in the microdescriptor
- cache. This will make it harder for us to accidentally free a
- microdescriptor without removing it from the appropriate data
- structures. Fixes issue 3135; issue noted by "wanoskarnet".
- - Shorten links in the tor-exit-notice file. Patch by Christian Kujau.
- o Minor bugfixes (code security):
- - Prevent a null-pointer dereference when receiving a data cell
- for a nonexistent stream when the circuit in question has an
- empty deliver window. We don't believe this is triggerable,
- since we don't currently allow deliver windows to become empty,
- but the logic is tricky enough that it's better to make the code
- robust. Fixes bug 5541; bugfix on 0.0.2pre14.
- - Fix a (harmless) integer overflow in cell statistics reported by
- some fast relays. Fixes bug 5849; bugfix on 0.2.2.1-alpha.
- - Fix our implementation of crypto_random_hostname() so it can't
- overflow on ridiculously large inputs. (No Tor version has ever
- provided this kind of bad inputs, but let's be correct in depth.)
- Fixes bug 4413; bugfix on 0.2.2.9-alpha. Fix by Stephen Palmateer.
- - Add a (probably redundant) memory clear between iterations of
- the router status voting loop, to prevent future coding errors
- where data might leak between iterations of the loop. Resolves
- ticket 6514.
- o Minor bugfixes (wrapper functions):
- - Abort if tor_vasprintf() fails in connection_printf_to_buf() (a
- utility function used in the control-port code). This shouldn't
- ever happen unless Tor is completely out of memory, but if it did
- happen and Tor somehow recovered from it, Tor could have sent a log
- message to a control port in the middle of a reply to a controller
- command. Fixes part of bug 3428; bugfix on 0.1.2.3-alpha.
- - Fix some (not actually triggerable) buffer size checks in usage of
- tor_inet_ntop(). Fixes bug 4434; bugfix on Tor 0.2.0.1-alpha. Patch
- by Anders Sundman.
- - Fix parsing of some corner-cases with tor_inet_pton(). Fixes
- bug 4515; bugfix on 0.2.0.1-alpha; fix by Anders Sundman.
- - Enforce correct return behavior of tor_vsscanf() when the '%%'
- pattern is used. Fixes bug 5558. Bugfix on 0.2.1.13.
- - Make our replacement implementation of strtok_r() compatible with
- the standard behavior of strtok_r(). Patch by nils. Fixes bug 5091;
- bugfix on 0.2.2.1-alpha.
- - Find more places in the code that should have been testing for
- invalid sockets using the SOCKET_OK macro. Required for a fix
- for bug 4533. Bugfix on 0.2.2.28-beta.
- o Minor bugfixes (code correctness):
- - Check return value of fputs() when writing authority certificate
- file. Fixes Coverity issue 709056; bugfix on 0.2.0.1-alpha.
- - When building Tor on Windows with -DUNICODE (not default), ensure
- that error messages, filenames, and DNS server names are always
- NUL-terminated when we convert them to a single-byte encoding.
- Fixes bug 5909; bugfix on 0.2.2.16-alpha.
- - Fix a memory leak when trying to launch a DNS request when the
- nameservers are unconfigurable. Fixes bug 5916; bugfix on Tor
- 0.1.2.1-alpha.
- - Correct file sizes when reading binary files on Cygwin, to avoid
- a bug where Tor would fail to read its state file. Fixes bug 6844;
- bugfix on 0.1.2.7-alpha.
- - Make sure to set *socket_error in all error cases in
- connection_connect(), so it can't produce a warning about
- errno being zero from errno_to_orconn_end_reason(). Bugfix on
- 0.2.1.1-alpha; resolves ticket 6028.
- - Initialize conn->addr to a valid state in spawn_cpuworker(). Fixes
- bug 4532; found by "troll_un".
- o Minor bugfixes (clients):
- - Allow one-hop directory-fetching circuits the full "circuit build
- timeout" period, rather than just half of it, before failing them
- and marking the relay down. This fix should help reduce cases where
- clients declare relays (or worse, bridges) unreachable because
- the TLS handshake takes a few seconds to complete. Fixes bug 6743;
- bugfix on 0.2.2.2-alpha, where we changed the timeout from a static
- 30 seconds.
- - Ensure we don't cannibalize circuits that are longer than three hops
- already, so we don't end up making circuits with 5 or more
- hops. Patch contributed by wanoskarnet. Fixes bug 5231; bugfix on
- 0.1.0.1-rc which introduced cannibalization.
- o Minor bugfixes (relays):
- - Don't publish a new relay descriptor when we reload our onion key,
- unless the onion key has actually changed. Fixes bug 3263 and
- resolves another cause of bug 1810. Bugfix on 0.1.1.11-alpha.
- - When relays refuse a "create" cell because their queue of pending
- create cells is too big (typically because their cpu can't keep up
- with the arrival rate), send back reason "resource limit" rather
- than reason "internal", so network measurement scripts can get a
- more accurate picture. Bugfix on 0.1.1.11-alpha; fixes bug 7037.
- - Exit nodes don't need to fetch certificates for authorities that
- they don't recognize; only directory authorities, bridges,
- and caches need to do that. Fixes part of bug 2297; bugfix on
- 0.2.2.11-alpha.
- o Minor bugfixes (directory authority / mirrors):
- - Avoid O(n^2) performance characteristics when parsing a large
- extrainfo cache. Fixes bug 5828; bugfix on 0.2.0.1-alpha.
- - Authorities no longer include any router in their microdescriptor
- consensuses for which they couldn't generate or agree on a
- microdescriptor. Fixes the second piece of bug 6404; fix on
- 0.2.2.6-alpha.
- - When checking for requested signatures on the latest consensus
- before serving it to a client, make sure to check the right
- consensus flavor. Bugfix on 0.2.2.6-alpha.
- - Fix an edge case where TestingTorNetwork is set but the authorities
- and relays all have an uptime of zero, so the private Tor network
- could briefly lack support for hidden services. Fixes bug 3886;
- bugfix on 0.2.2.18-alpha.
- - Directory caches no longer refuse to clean out descriptors because
- of missing v2 networkstatus documents, unless they're configured
- to retrieve v2 networkstatus documents. Fixes bug 4838; bugfix on
- 0.2.2.26-beta. Patch by Daniel Bryg.
- - Don't serve or accept v2 hidden service descriptors over a relay's
- DirPort. It's never correct to do so, and disabling it might
- make it more annoying to exploit any bugs that turn up in the
- descriptor-parsing code. Fixes bug 7149.
- o Minor bugfixes (hidden services, client-side):
- - Assert that hidden-service-related operations are not performed
- using single-hop circuits. Previously, Tor would assert that
- client-side streams are not attached to single-hop circuits,
- but not that other sensitive operations on the client and service
- side are not performed using single-hop circuits. Fixes bug 3332;
- bugfix on 0.0.6.
- - Avoid undefined behavior when parsing the list of supported
- rendezvous/introduction protocols in a hidden service descriptor.
- Previously, Tor would have confused (as-yet-unused) protocol version
- numbers greater than 32 with lower ones on many platforms. Fixes
- bug 6827; bugfix on 0.2.0.10-alpha. Found by George Kadianakis.
- - Don't close hidden service client circuits which have almost
- finished connecting to their destination when they reach
- the normal circuit-build timeout. Previously, we would close
- introduction circuits which are waiting for an acknowledgement
- from the introduction point, and rendezvous circuits which have
- been specified in an INTRODUCE1 cell sent to a hidden service,
- after the normal CBT. Now, we mark them as 'timed out', and launch
- another rendezvous attempt in parallel. This behavior change can
- be disabled using the new CloseHSClientCircuitsImmediatelyOnTimeout
- option. Fixes part of bug 1297; bugfix on 0.2.2.2-alpha.
- o Minor bugfixes (hidden services, service-side):
- - Don't close hidden-service-side rendezvous circuits when they
- reach the normal circuit-build timeout. This behavior change can
- be disabled using the new
- CloseHSServiceRendCircuitsImmediatelyOnTimeout option. Fixes the
- remaining part of bug 1297; bugfix on 0.2.2.2-alpha.
- - Don't launch more than 10 service-side introduction-point circuits
- for a hidden service in five minutes. Previously, we would consider
- launching more introduction-point circuits if at least one second
- had passed without any introduction-point circuits failing. Fixes
- bug 4607; bugfix on 0.0.7pre1.
- o Minor bugfixes (config option behavior):
- - If the user tries to set MyFamily on a bridge, refuse to
- do so, and warn about the security implications. Fixes bug 4657;
- bugfix on 0.2.0.3-alpha.
- - The "--quiet" and "--hush" options now apply not only to Tor's
- behavior before logs are configured, but also to Tor's behavior in
- the absence of configured logs. Fixes bug 3550; bugfix on
- 0.2.0.10-alpha.
- - Change the AllowDotExit rules so they should actually work.
- We now enforce AllowDotExit only immediately after receiving an
- address via SOCKS or DNSPort: other sources are free to provide
- .exit addresses after the resolution occurs. Fixes bug 3940;
- bugfix on 0.2.2.1-alpha.
- - Make "LearnCircuitBuildTimeout 0" work more reliably. Specifically,
- don't depend on the consensus parameters or compute adaptive
- timeouts when it is disabled. Fixes bug 5049; bugfix on
- 0.2.2.14-alpha.
- - After we pick a directory mirror, we would refuse to use it if
- it's in our ExcludeExitNodes list, resulting in mysterious failures
- to bootstrap for people who just wanted to avoid exiting from
- certain locations. Fixes bug 5623; bugfix on 0.2.2.25-alpha.
- - When told to add a bridge with the same digest as a preexisting
- bridge but a different addr:port, change the addr:port as
- requested. Previously we would not notice the change. Fixes half
- of bug 5603; fix on 0.2.2.26-beta.
- o Minor bugfixes (controller):
- - Allow manual 'authenticate' commands to the controller interface
- from netcat (nc) as well as telnet. We were rejecting them because
- they didn't come with the expected whitespace at the end of the
- command. Bugfix on 0.1.1.1-alpha; fixes bug 2893.
- - Report a real bootstrap problem to the controller on router
- identity mismatch. Previously we just said "foo", which probably
- made a lot of sense at the time. Fixes bug 4169; bugfix on
- 0.2.1.1-alpha.
- - When we receive a SIGHUP and the controller __ReloadTorrcOnSIGHUP
- option is set to 0 (which Vidalia version 0.2.16 now does when
- a SAVECONF attempt fails), perform other actions that SIGHUP
- usually causes (like reopening the logs). Fixes bug 5095; bugfix
- on 0.2.1.9-alpha.
- - Correctly handle checking the permissions on the parent
- directory of a control socket in the root directory. Bug found
- by Esteban Manchado Velázquez. Fixes bug 5089; bugfix on Tor
- 0.2.2.26-beta.
- - End AUTHCHALLENGE error messages (in the control protocol) with
- a CRLF. Fixes bug 5760; bugfix on 0.2.2.36.
- o Minor bugfixes (network reading/writing):
- - Disable writing on marked-for-close connections when they are
- blocked on bandwidth, to prevent busy-looping in Libevent. Fixes
- bug 5263; bugfix on 0.0.2pre13, where we first added a special
- case for flushing marked connections.
- - Make sure that there are no unhandled pending TLS errors before
- reading from a TLS stream. We had checks in 0.1.0.3-rc, but
- lost them in 0.1.0.5-rc when we refactored read_to_buf_tls().
- Bugfix on 0.1.0.5-rc; fixes bug 4528.
- - Detect SSL handshake even when the initial attempt to write the
- server hello fails. Fixes bug 4592; bugfix on 0.2.0.13-alpha.
- - If the client fails to set a reasonable set of ciphersuites
- during its v2 handshake renegotiation, allow the renegotiation to
- continue nevertheless (i.e. send all the required certificates).
- Fixes bug 4591; bugfix on 0.2.0.20-rc.
- o Minor bugfixes (other):
- - Exit nodes now correctly report EADDRINUSE and EADDRNOTAVAIL as
- resource exhaustion, so that clients can adjust their load to
- try other exits. Fixes bug 4710; bugfix on 0.1.0.1-rc, which
- started using END_STREAM_REASON_RESOURCELIMIT.
- - Don't check for whether the address we're using for outbound
- connections has changed until after the outbound connection has
- completed. On Windows, getsockname() doesn't succeed until the
- connection is finished. Fixes bug 5374; bugfix on 0.1.1.14-alpha.
- - Don't hold a Windows file handle open for every file mapping;
- the file mapping handle is sufficient. Fixes bug 5951; bugfix on
- 0.1.2.1-alpha.
- - Fix wrong TCP port range in parse_port_range(). Fixes bug 6218;
- bugfix on 0.2.1.10-alpha.
- - If we fail to write a microdescriptor to the disk cache, do not
- continue replacing the old microdescriptor file. Fixes bug 2954;
- bugfix on 0.2.2.6-alpha.
- o Minor bugfixes (log messages, path selection):
- - Downgrade "set buildtimeout to low value" messages to "info"
- severity; they were never an actual problem, there was never
- anything reasonable to do about them, and they tended to spam logs
- from time to time. Fixes bug 6251; bugfix on 0.2.2.2-alpha.
- - Rate-limit the "Weighted bandwidth is 0.000000" message, and add
- more information to it, so that we can track it down in case it
- returns again. Mitigates bug 5235.
- - Check CircuitBuildTimeout and LearnCircuitBuildTimeout in
- options_validate(); warn if LearnCircuitBuildTimeout is disabled and
- CircuitBuildTimeout is set unreasonably low. Resolves ticket 5452.
- - Issue a log message if a guard completes less than 40% of your
- circuits. Threshold is configurable by torrc option
- PathBiasNoticeRate and consensus parameter pb_noticepct. There is
- additional, off-by-default code to disable guards which fail too
- many circuits. Addresses ticket 5458.
- o Minor bugfixes (log messages, client):
- - Downgrade "Got a certificate, but we already have it" log messages
- from warning to info, except when we're a dirauth. Fixes bug 5238;
- bugfix on 0.2.1.7-alpha.
- - Fix the log message describing how we work around discovering
- that our version is the ill-fated OpenSSL 0.9.8l. Fixes bug
- 4837; bugfix on 0.2.2.9-alpha.
- - When logging about a disallowed .exit name, do not also call it
- an "invalid onion address". Fixes bug 3325; bugfix on 0.2.2.9-alpha.
- - Fix a log message suggesting that people contact a non-existent
- email address. Fixes bug 3448.
- - Rephrase the log message emitted if the TestSocks check is
- successful. Patch from Fabian Keil; fixes bug 4094.
- - Log (at debug level) whenever a circuit's purpose is changed.
- - Log SSL state transitions at log level DEBUG, log domain
- HANDSHAKE. This can be useful for debugging censorship events.
- Implements ticket 3264.
- - We now log which torrc file we're using on startup. Implements
- ticket 2444.
- - Rate-limit log messages when asked to connect anonymously to
- a private address. When these hit, they tended to hit fast and
- often. Also, don't bother trying to connect to addresses that we
- are sure will resolve to 127.0.0.1: getting 127.0.0.1 in a directory
- reply makes us think we have been lied to, even when the address the
- client tried to connect to was "localhost." Resolves ticket 2822.
- o Minor bugfixes (log messages, non-client):
- - Downgrade "eventdns rejected address" message to LOG_PROTOCOL_WARN.
- Fixes bug 5932; bugfix on 0.2.2.7-alpha.
- - Don't log that we have "decided to publish new relay descriptor"
- unless we are actually publishing a descriptor. Fixes bug 3942;
- bugfix on 0.2.2.28-beta.
- - Log which authority we're missing votes from when we go to fetch
- them from the other auths.
- - Replace "Sending publish request" log messages with "Launching
- upload", so that they no longer confusingly imply that we're
- sending something to a directory we might not even be connected
- to yet. Fixes bug 3311; bugfix on 0.2.0.10-alpha.
- - Warn when Tor is configured to use accounting in a way that can
- link a hidden service to some other hidden service or public
- address. Resolves ticket 6490.
- - Fix a minor formatting issue in one of tor-gencert's error messages.
- Fixes bug 4574.
- o Testing:
- - Update to the latest version of the tinytest unit testing framework.
- This includes a couple of bugfixes that can be relevant for
- running forked unit tests on Windows, and removes all reserved
- identifiers.
- - Avoid a false positive in the util/threads unit test by increasing
- the maximum timeout time. Fixes bug 6227; bugfix on 0.2.0.4-alpha.
- - Make it possible to set the TestingTorNetwork configuration
- option using AlternateDirAuthority and AlternateBridgeAuthority
- as an alternative to setting DirServer. Addresses ticket 6377.
- - Add a unit test for the environment_variable_names_equal() function.
- - A wide variety of new unit tests by Esteban Manchado Velázquez.
- - Numerous new unit tests for functions in util.c and address.c by
- Anders Sundman.
- - The long-disabled benchmark tests are now split into their own
- ./src/test/bench binary.
- - The benchmark tests can now use more accurate timers than
- gettimeofday() when such timers are available.
- - Use tt_assert(), not tor_assert(), for checking for test failures.
- This makes the unit tests more able to go on in the event that
- one of them fails.
- o Build improvements:
- - Use the dead_strip option when building Tor on OS X. This reduces
- binary size by almost 19% when linking openssl and libevent
- statically, which we do for Tor Browser Bundle.
- - Provide a better error message about possible OSX Asciidoc failure
- reasons. Fixes bug 6436.
- - Detect attempts to build Tor on (as yet hypothetical) versions
- of Windows where sizeof(intptr_t) != sizeof(SOCKET). Partial
- fix for bug 4533. Bugfix on 0.2.2.28-beta.
- - On Windows, we now define the _WIN32_WINNT macros only if they
- are not already defined. This lets the person building Tor decide,
- if they want, to require a later version of Windows.
- - Our autogen.sh script now uses autoreconf to launch autoconf,
- automake, and so on. This is more robust against some of the failure
- modes associated with running the autotools pieces on their own.
- - Running "make version" now displays the version of Tor that
- we're about to build. Idea from katmagic; resolves issue 4400.
- - Make 'tor --digests' list hashes of all Tor source files. Bugfix
- on 0.2.2.4-alpha; fixes bug 3427.
- - New --enable-static-tor configure option for building Tor as
- statically as possible. Idea, general hackery and thoughts from
- Alexei Czeskis, John Gilmore, Jacob Appelbaum. Implements ticket
- 2702.
- - Limited, experimental support for building with nmake and MSVC.
- o Build requirements:
- - Building Tor with bufferevent support now requires Libevent
- 2.0.13-stable or later. Previous versions of Libevent had bugs in
- SSL-related bufferevents and related issues that would make Tor
- work badly with bufferevents. Requiring 2.0.13-stable also allows
- Tor with bufferevents to take advantage of Libevent APIs
- introduced after 2.0.8-rc.
- - Our build system requires automake 1.6 or later to create the
- Makefile.in files. Previously, you could have used 1.4.
- This only affects developers and people building Tor from git;
- people who build Tor from the source distribution without changing
- the Makefile.am files should be fine.
- - Detect when we try to build on a platform that doesn't define
- AF_UNSPEC to 0. We don't work there, so refuse to compile.
- o Build fixes (compile/link):
- - Format more doubles with %f, not %lf. Patch from grarpamp to make
- Tor build correctly on older BSDs again. Fixes bug 3894; bugfix on
- Tor 0.2.0.8-alpha.
- - When building with --enable-static-tor on OpenBSD, do not
- erroneously attempt to link -lrt. Fixes bug 5103.
- - Set _WIN32_WINNT to 0x0501 consistently throughout the code, so
- that IPv6 stuff will compile on MSVC, and compilation issues
- will be easier to track down. Fixes bug 5861.
- - Fix build and 64-bit compile warnings from --enable-openbsd-malloc.
- Fixes bug 6379. Bugfix on 0.2.0.20-rc.
- - Make Tor build correctly again with -DUNICODE -D_UNICODE defined.
- Fixes bug 6097; bugfix on 0.2.2.16-alpha.
- o Build fixes (other):
- - Use the _WIN32 macro throughout our code to detect Windows.
- (Previously we had used the obsolete 'WIN32' and the idiosyncratic
- 'MS_WINDOWS'.)
- - Properly handle the case where the build-tree is not the same
- as the source tree when generating src/common/common_sha1.i,
- src/or/micro-revision.i, and src/or/or_sha1.i. Fixes bug 3953;
- bugfix on 0.2.0.1-alpha.
- - During configure, search for library containing cos function as
- libm lives in libcore on some platforms (BeOS/Haiku). Linking
- against libm was hard-coded before. Fixes the first part of bug
- 4727; bugfix on 0.2.2.2-alpha. Patch and analysis by Martin Hebnes
- Pedersen.
- - Prevent a false positive from the check-spaces script, by disabling
- the "whitespace between function name and (" check for functions
- named 'op()'.
- o Packaging (RPM) changes:
- - Update our default RPM spec files to work with mock and rpmbuild
- on RHEL/Fedora. They have an updated set of dependencies and
- conflicts, a fix for an ancient typo when creating the "_tor"
- user, and better instructions. Thanks to Ondrej Mikle for the
- patch series. Fixes bug 6043.
- - On OpenSUSE, create the /var/run/tor directory on startup if it
- is not already created. Patch from Andreas Stieger. Fixes bug 2573.
- o Code refactoring (safety):
- - Do not use SMARTLIST_FOREACH for any loop whose body exceeds
- 10 lines. Also, don't nest them. Doing so in the past has
- led to hard-to-debug code. The new style is to use the
- SMARTLIST_FOREACH_{BEGIN,END} pair. Addresses issue 6400.
- - Use macros to indicate OpenSSL versions, so we don't need to worry
- about accidental hexadecimal bit shifts.
- - Use tor_sscanf() in place of scanf() in more places through the
- code. This makes us a little more locale-independent, and
- should help shut up code-analysis tools that can't tell
- a safe sscanf string from a dangerous one.
- - Convert more instances of tor_snprintf+tor_strdup into tor_asprintf.
- - Use the smartlist_add_asprintf() alias more consistently.
- o Code refactoring (consolidate):
- - A major revision to our internal node-selecting and listing logic.
- Tor already had at least two major ways to look at the question of
- "which Tor servers do we know about": a list of router descriptors,
- and a list of entries in the current consensus. With
- microdescriptors, we're adding a third. Having so many systems
- without an abstraction layer over them was hurting the codebase.
- Now, we have a new "node_t" abstraction that presents a consistent
- interface to a client's view of a Tor node, and holds (nearly) all
- of the mutable state formerly in routerinfo_t and routerstatus_t.
- - Move tor_gettimeofday_cached() into compat_libevent.c, and use
- Libevent's notion of cached time when possible.
- - Remove duplicate code for invoking getrlimit() from control.c.
- - Use OpenSSL's built-in SSL_state_string_long() instead of our
- own homebrewed ssl_state_to_string() replacement. Patch from
- Emile Snyder. Fixes bug 4653.
- - Change the symmetric cipher interface so that creating and
- initializing a stream cipher are no longer separate functions.
- o Code refactoring (separate):
- - Make a new "entry connection" struct as an internal subtype of "edge
- connection", to simplify the code and make exit connections smaller.
- - Split connection_about_to_close() into separate functions for each
- connection type.
- - Rewrite the listener-selection logic so that parsing which ports
- we want to listen on is now separate from binding to the ports
- we want.
- o Code refactoring (name changes):
- - Rename a handful of old identifiers, mostly related to crypto
- structures and crypto functions. By convention, our "create an
- object" functions are called "type_new()", our "free an object"
- functions are called "type_free()", and our types indicate that
- they are types only with a final "_t". But a handful of older
- types and functions broke these rules, with function names like
- "type_create" or "subsystem_op_type", or with type names like
- type_env_t.
- - Rename Tor functions that turn strings into addresses, so that
- "parse" indicates that no hostname resolution occurs, and
- "lookup" indicates that hostname resolution may occur. This
- should help prevent mistakes in the future. Fixes bug 3512.
- - Use the name "CERTS" consistently to refer to the new cell type;
- we were calling it CERT in some places and CERTS in others.
- - Use a TOR_INVALID_SOCKET macro when initializing a socket to an
- invalid value, rather than just -1.
- - Rename the bench_{aes,dmap} functions to test_*, so that tinytest
- can pick them up when the tests aren't disabled. Bugfix on
- 0.2.2.4-alpha which introduced tinytest.
- o Code refactoring (other):
- - Defensively refactor rend_mid_rendezvous() so that protocol
- violations and length checks happen in the beginning. Fixes
- bug 5645.
- - Remove the pure attribute from all functions that used it
- previously. In many cases we assigned it incorrectly, because the
- functions might assert or call impure functions, and we don't have
- evidence that keeping the pure attribute is worthwhile. Implements
- changes suggested in ticket 4421.
- - Move the replay-detection cache for the RSA-encrypted parts of
- INTRODUCE2 cells to the introduction point data structures.
- Previously, we would use one replay-detection cache per hidden
- service. Required by fix for bug 3460.
- - The helper programs tor-gencert, tor-resolve, and tor-checkkey
- no longer link against Libevent: they never used it, but
- our library structure used to force them to link it.
- o Removed features and files:
- - Remove all internal support for unpadded RSA. We never used it, and
- it would be a bad idea to start.
- - Remove some workaround code for OpenSSL 0.9.6 (which is no longer
- supported).
- - Remove some redundant #include directives throughout the code.
- Patch from Andrea Gelmini.
- - Remove some old code to remember statistics about which descriptors
- we've served as a directory mirror. The feature wasn't used and
- is outdated now that microdescriptors are around.
- - Remove some old code to work around even older versions of Tor that
- used forked processes to handle DNS requests. Such versions of Tor
- are no longer in use as relays.
- - The "torify" script no longer supports the "tsocks" socksifier
- tool, since tsocks doesn't support DNS and UDP right for Tor.
- Everyone should be using torsocks instead. Fixes bugs 3530 and
- 5180. Based on a patch by "ugh".
- - Remove the torrc.bridge file: we don't use it for anything, and
- it had become badly desynchronized from torrc.sample. Resolves
- bug 5622.
- o Documentation:
- - Begin a doc/state-contents.txt file to explain the contents of
- the Tor state file. Fixes bug 2987.
- - Clarify the documentation for the Alternate*Authority options.
- Fixes bug 6387.
- - Document the --defaults-torrc option, and the new semantics for
- overriding, extending, and clearing lists of options. Closes
- bug 4748.
- - Add missing man page documentation for consensus and microdesc
- files. Resolves ticket 6732.
- - Fix some typos in the manpages. Patch from A. Costa. Fixes bug 6500.
- o Documentation fixes:
- - Improve the manual's documentation for the NT Service command-line
- options. Addresses ticket 3964.
- - Clarify SessionGroup documentation slightly; resolves ticket 5437.
- - Document the changes to the ORPort and DirPort options, and the
- fact that {OR/Dir}ListenAddress is now unnecessary (and
- therefore deprecated). Resolves ticket 5597.
- - Correct a broken faq link in the INSTALL file. Fixes bug 2307.
- - Clarify that hidden services are TCP only. Fixes bug 6024.
- Changes in version 0.2.2.39 - 2012-09-11
- Tor 0.2.2.39 fixes two more opportunities for remotely triggerable
- assertions.
- o Security fixes:
- - Fix an assertion failure in tor_timegm() that could be triggered
- by a badly formatted directory object. Bug found by fuzzing with
- Radamsa. Fixes bug 6811; bugfix on 0.2.0.20-rc.
- - Do not crash when comparing an address with port value 0 to an
- address policy. This bug could have been used to cause a remote
- assertion failure by or against directory authorities, or to
- allow some applications to crash clients. Fixes bug 6690; bugfix
- on 0.2.1.10-alpha.
- Changes in version 0.2.2.38 - 2012-08-12
- Tor 0.2.2.38 fixes a remotely triggerable crash bug, and fixes a timing
- attack that could in theory leak path information.
- o Security fixes:
- - Avoid an uninitialized memory read when reading a vote or consensus
- document that has an unrecognized flavor name. This read could
- lead to a remote crash bug. Fixes bug 6530; bugfix on 0.2.2.6-alpha.
- - Try to leak less information about what relays a client is
- choosing to a side-channel attacker. Previously, a Tor client would
- stop iterating through the list of available relays as soon as it
- had chosen one, thus finishing a little earlier when it picked
- a router earlier in the list. If an attacker can recover this
- timing information (nontrivial but not proven to be impossible),
- they could learn some coarse-grained information about which relays
- a client was picking (middle nodes in particular are likelier to
- be affected than exits). The timing attack might be mitigated by
- other factors (see bug 6537 for some discussion), but it's best
- not to take chances. Fixes bug 6537; bugfix on 0.0.8rc1.
- Changes in version 0.2.2.37 - 2012-06-06
- Tor 0.2.2.37 introduces a workaround for a critical renegotiation
- bug in OpenSSL 1.0.1 (where 20% of the Tor network can't talk to itself
- currently).
- o Major bugfixes:
- - Work around a bug in OpenSSL that broke renegotiation with TLS
- 1.1 and TLS 1.2. Without this workaround, all attempts to speak
- the v2 Tor connection protocol when both sides were using OpenSSL
- 1.0.1 would fail. Resolves ticket 6033.
- - When waiting for a client to renegotiate, don't allow it to add
- any bytes to the input buffer. This fixes a potential DoS issue.
- Fixes bugs 5934 and 6007; bugfix on 0.2.0.20-rc.
- - Fix an edge case where if we fetch or publish a hidden service
- descriptor, we might build a 4-hop circuit and then use that circuit
- for exiting afterwards -- even if the new last hop doesn't obey our
- ExitNodes config option. Fixes bug 5283; bugfix on 0.2.0.10-alpha.
- o Minor bugfixes:
- - Fix a build warning with Clang 3.1 related to our use of vasprintf.
- Fixes bug 5969. Bugfix on 0.2.2.11-alpha.
- o Minor features:
- - Tell GCC and Clang to check for any errors in format strings passed
- to the tor_v*(print|scan)f functions.
- Changes in version 0.2.2.36 - 2012-05-24
- Tor 0.2.2.36 updates the addresses for two of the eight directory
- authorities, fixes some potential anonymity and security issues,
- and fixes several crash bugs.
- Tor 0.2.1.x has reached its end-of-life. Those Tor versions have many
- known flaws, and nobody should be using them. You should upgrade. If
- you're using a Linux or BSD and its packages are obsolete, stop using
- those packages and upgrade anyway.
- o Directory authority changes:
- - Change IP address for maatuska (v3 directory authority).
- - Change IP address for ides (v3 directory authority), and rename
- it to turtles.
- o Security fixes:
- - When building or running with any version of OpenSSL earlier
- than 0.9.8s or 1.0.0f, disable SSLv3 support. These OpenSSL
- versions have a bug (CVE-2011-4576) in which their block cipher
- padding includes uninitialized data, potentially leaking sensitive
- information to any peer with whom they make a SSLv3 connection. Tor
- does not use SSL v3 by default, but a hostile client or server
- could force an SSLv3 connection in order to gain information that
- they shouldn't have been able to get. The best solution here is to
- upgrade to OpenSSL 0.9.8s or 1.0.0f (or later). But when building
- or running with a non-upgraded OpenSSL, we disable SSLv3 entirely
- to make sure that the bug can't happen.
- - Never use a bridge or a controller-supplied node as an exit, even
- if its exit policy allows it. Found by wanoskarnet. Fixes bug
- 5342. Bugfix on 0.1.1.15-rc (for controller-purpose descriptors)
- and 0.2.0.3-alpha (for bridge-purpose descriptors).
- - Only build circuits if we have a sufficient threshold of the total
- descriptors that are marked in the consensus with the "Exit"
- flag. This mitigates an attack proposed by wanoskarnet, in which
- all of a client's bridges collude to restrict the exit nodes that
- the client knows about. Fixes bug 5343.
- - Provide controllers with a safer way to implement the cookie
- authentication mechanism. With the old method, if another locally
- running program could convince a controller that it was the Tor
- process, then that program could trick the controller into telling
- it the contents of an arbitrary 32-byte file. The new "SAFECOOKIE"
- authentication method uses a challenge-response approach to prevent
- this attack. Fixes bug 5185; implements proposal 193.
- o Major bugfixes:
- - Avoid logging uninitialized data when unable to decode a hidden
- service descriptor cookie. Fixes bug 5647; bugfix on 0.2.1.5-alpha.
- - Avoid a client-side assertion failure when receiving an INTRODUCE2
- cell on a general purpose circuit. Fixes bug 5644; bugfix on
- 0.2.1.6-alpha.
- - Fix builds when the path to sed, openssl, or sha1sum contains
- spaces, which is pretty common on Windows. Fixes bug 5065; bugfix
- on 0.2.2.1-alpha.
- - Correct our replacements for the timeradd() and timersub() functions
- on platforms that lack them (for example, Windows). The timersub()
- function is used when expiring circuits, while timeradd() is
- currently unused. Bug report and patch by Vektor. Fixes bug 4778;
- bugfix on 0.2.2.24-alpha.
- - Fix the SOCKET_OK test that we use to tell when socket
- creation fails so that it works on Win64. Fixes part of bug 4533;
- bugfix on 0.2.2.29-beta. Bug found by wanoskarnet.
- o Minor bugfixes:
- - Reject out-of-range times like 23:59:61 in parse_rfc1123_time().
- Fixes bug 5346; bugfix on 0.0.8pre3.
- - Make our number-parsing functions always treat too-large values
- as an error, even when those values exceed the width of the
- underlying type. Previously, if the caller provided these
- functions with minima or maxima set to the extreme values of the
- underlying integer type, these functions would return those
- values on overflow rather than treating overflow as an error.
- Fixes part of bug 5786; bugfix on 0.0.9.
- - Older Linux kernels erroneously respond to strange nmap behavior
- by having accept() return successfully with a zero-length
- socket. When this happens, just close the connection. Previously,
- we would try harder to learn the remote address: but there was
- no such remote address to learn, and our method for trying to
- learn it was incorrect. Fixes bugs 1240, 4745, and 4747. Bugfix
- on 0.1.0.3-rc. Reported and diagnosed by "r1eo".
- - Correct parsing of certain date types in parse_http_time().
- Without this patch, If-Modified-Since would behave
- incorrectly. Fixes bug 5346; bugfix on 0.2.0.2-alpha. Patch from
- Esteban Manchado Velázques.
- - Change the BridgePassword feature (part of the "bridge community"
- design, which is not yet implemented) to use a time-independent
- comparison. The old behavior might have allowed an adversary
- to use timing to guess the BridgePassword value. Fixes bug 5543;
- bugfix on 0.2.0.14-alpha.
- - Detect and reject certain misformed escape sequences in
- configuration values. Previously, these values would cause us
- to crash if received in a torrc file or over an authenticated
- control port. Bug found by Esteban Manchado Velázquez, and
- independently by Robert Connolly from Matta Consulting who further
- noted that it allows a post-authentication heap overflow. Patch
- by Alexander Schrijver. Fixes bugs 5090 and 5402 (CVE 2012-1668);
- bugfix on 0.2.0.16-alpha.
- - Fix a compile warning when using the --enable-openbsd-malloc
- configure option. Fixes bug 5340; bugfix on 0.2.0.20-rc.
- - During configure, detect when we're building with clang version
- 3.0 or lower and disable the -Wnormalized=id and -Woverride-init
- CFLAGS. clang doesn't support them yet.
- - When sending an HTTP/1.1 proxy request, include a Host header.
- Fixes bug 5593; bugfix on 0.2.2.1-alpha.
- - Fix a NULL-pointer dereference on a badly formed SETCIRCUITPURPOSE
- command. Found by mikeyc. Fixes bug 5796; bugfix on 0.2.2.9-alpha.
- - If we hit the error case where routerlist_insert() replaces an
- existing (old) server descriptor, make sure to remove that
- server descriptor from the old_routers list. Fix related to bug
- 1776. Bugfix on 0.2.2.18-alpha.
- o Minor bugfixes (documentation and log messages):
- - Fix a typo in a log message in rend_service_rendezvous_has_opened().
- Fixes bug 4856; bugfix on Tor 0.0.6.
- - Update "ClientOnly" man page entry to explain that there isn't
- really any point to messing with it. Resolves ticket 5005.
- - Document the GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays
- directory authority option (introduced in Tor 0.2.2.34).
- - Downgrade the "We're missing a certificate" message from notice
- to info: people kept mistaking it for a real problem, whereas it
- is seldom the problem even when we are failing to bootstrap. Fixes
- bug 5067; bugfix on 0.2.0.10-alpha.
- - Correctly spell "connect" in a log message on failure to create a
- controlsocket. Fixes bug 4803; bugfix on 0.2.2.26-beta.
- - Clarify the behavior of MaxCircuitDirtiness with hidden service
- circuits. Fixes issue 5259.
- o Minor features:
- - Directory authorities now reject versions of Tor older than
- 0.2.1.30, and Tor versions between 0.2.2.1-alpha and 0.2.2.20-alpha
- inclusive. These versions accounted for only a small fraction of
- the Tor network, and have numerous known security issues. Resolves
- issue 4788.
- - Update to the May 1 2012 Maxmind GeoLite Country database.
- - Feature removal:
- - When sending or relaying a RELAY_EARLY cell, we used to convert
- it to a RELAY cell if the connection was using the v1 link
- protocol. This was a workaround for older versions of Tor, which
- didn't handle RELAY_EARLY cells properly. Now that all supported
- versions can handle RELAY_EARLY cells, and now that we're enforcing
- the "no RELAY_EXTEND commands except in RELAY_EARLY cells" rule,
- remove this workaround. Addresses bug 4786.
- Changes in version 0.2.2.35 - 2011-12-16
- Tor 0.2.2.35 fixes a critical heap-overflow security issue in Tor's
- buffers code. Absolutely everybody should upgrade.
- The bug relied on an incorrect calculation when making data continuous
- in one of our IO buffers, if the first chunk of the buffer was
- misaligned by just the wrong amount. The miscalculation would allow an
- attacker to overflow a piece of heap-allocated memory. To mount this
- attack, the attacker would need to either open a SOCKS connection to
- Tor's SocksPort (usually restricted to localhost), or target a Tor
- instance configured to make its connections through a SOCKS proxy
- (which Tor does not do by default).
- Good security practice requires that all heap-overflow bugs should be
- presumed to be exploitable until proven otherwise, so we are treating
- this as a potential code execution attack. Please upgrade immediately!
- This bug does not affect bufferevents-based builds of Tor. Special
- thanks to "Vektor" for reporting this issue to us!
- Tor 0.2.2.35 also fixes several bugs in previous versions, including
- crash bugs for unusual configurations, and a long-term bug that
- would prevent Tor from starting on Windows machines with draconian
- AV software.
- With this release, we remind everyone that 0.2.0.x has reached its
- formal end-of-life. Those Tor versions have many known flaws, and
- nobody should be using them. You should upgrade -- ideally to the
- 0.2.2.x series. If you're using a Linux or BSD and its packages are
- obsolete, stop using those packages and upgrade anyway.
- The Tor 0.2.1.x series is also approaching its end-of-life: it will no
- longer receive support after some time in early 2012.
- o Major bugfixes:
- - Fix a heap overflow bug that could occur when trying to pull
- data into the first chunk of a buffer, when that chunk had
- already had some data drained from it. Fixes CVE-2011-2778;
- bugfix on 0.2.0.16-alpha. Reported by "Vektor".
- - Initialize Libevent with the EVENT_BASE_FLAG_NOLOCK flag enabled, so
- that it doesn't attempt to allocate a socketpair. This could cause
- some problems on Windows systems with overzealous firewalls. Fix for
- bug 4457; workaround for Libevent versions 2.0.1-alpha through
- 2.0.15-stable.
- - If we mark an OR connection for close based on a cell we process,
- don't process any further cells on it. We already avoid further
- reads on marked-for-close connections, but now we also discard the
- cells we'd already read. Fixes bug 4299; bugfix on 0.2.0.10-alpha,
- which was the first version where we might mark a connection for
- close based on processing a cell on it.
- - Correctly sanity-check that we don't underflow on a memory
- allocation (and then assert) for hidden service introduction
- point decryption. Bug discovered by Dan Rosenberg. Fixes bug 4410;
- bugfix on 0.2.1.5-alpha.
- - Fix a memory leak when we check whether a hidden service
- descriptor has any usable introduction points left. Fixes bug
- 4424. Bugfix on 0.2.2.25-alpha.
- - Don't crash when we're running as a relay and don't have a GeoIP
- file. Bugfix on 0.2.2.34; fixes bug 4340. This backports a fix
- we've had in the 0.2.3.x branch already.
- - When running as a client, do not print a misleading (and plain
- wrong) log message that we're collecting "directory request"
- statistics: clients don't collect statistics. Also don't create a
- useless (because empty) stats file in the stats/ directory. Fixes
- bug 4353; bugfix on 0.2.2.34.
- o Minor bugfixes:
- - Detect failure to initialize Libevent. This fix provides better
- detection for future instances of bug 4457.
- - Avoid frequent calls to the fairly expensive cull_wedged_cpuworkers
- function. This was eating up hideously large amounts of time on some
- busy servers. Fixes bug 4518; bugfix on 0.0.9.8.
- - Resolve an integer overflow bug in smartlist_ensure_capacity().
- Fixes bug 4230; bugfix on Tor 0.1.0.1-rc. Based on a patch by
- Mansour Moufid.
- - Don't warn about unused log_mutex in log.c when building with
- --disable-threads using a recent GCC. Fixes bug 4437; bugfix on
- 0.1.0.6-rc which introduced --disable-threads.
- - When configuring, starting, or stopping an NT service, stop
- immediately after the service configuration attempt has succeeded
- or failed. Fixes bug 3963; bugfix on 0.2.0.7-alpha.
- - When sending a NETINFO cell, include the original address
- received for the other side, not its canonical address. Found
- by "troll_un"; fixes bug 4349; bugfix on 0.2.0.10-alpha.
- - Fix a typo in a hibernation-related log message. Fixes bug 4331;
- bugfix on 0.2.2.23-alpha; found by "tmpname0901".
- - Fix a memory leak in launch_direct_bridge_descriptor_fetch() that
- occurred when a client tried to fetch a descriptor for a bridge
- in ExcludeNodes. Fixes bug 4383; bugfix on 0.2.2.25-alpha.
- - Backport fixes for a pair of compilation warnings on Windows.
- Fixes bug 4521; bugfix on 0.2.2.28-beta and on 0.2.2.29-beta.
- - If we had ever tried to call tor_addr_to_str on an address of
- unknown type, we would have done a strdup on an uninitialized
- buffer. Now we won't. Fixes bug 4529; bugfix on 0.2.1.3-alpha.
- Reported by "troll_un".
- - Correctly detect and handle transient lookup failures from
- tor_addr_lookup. Fixes bug 4530; bugfix on 0.2.1.5-alpha.
- Reported by "troll_un".
- - Fix null-pointer access that could occur if TLS allocation failed.
- Fixes bug 4531; bugfix on 0.2.0.20-rc. Found by "troll_un".
- - Use tor_socket_t type for listener argument to accept(). Fixes bug
- 4535; bugfix on 0.2.2.28-beta. Found by "troll_un".
- o Minor features:
- - Add two new config options for directory authorities:
- AuthDirFastGuarantee sets a bandwidth threshold for guaranteeing the
- Fast flag, and AuthDirGuardBWGuarantee sets a bandwidth threshold
- that is always sufficient to satisfy the bandwidth requirement for
- the Guard flag. Now it will be easier for researchers to simulate
- Tor networks with different values. Resolves ticket 4484.
- - When Tor ignores a hidden service specified in its configuration,
- include the hidden service's directory in the warning message.
- Previously, we would only tell the user that some hidden service
- was ignored. Bugfix on 0.0.6; fixes bug 4426.
- - Update to the December 6 2011 Maxmind GeoLite Country database.
- o Packaging changes:
- - Make it easier to automate expert package builds on Windows,
- by removing an absolute path from makensis.exe command.
- Changes in version 0.2.1.32 - 2011-12-16
- Tor 0.2.1.32 backports important security and privacy fixes for
- oldstable. This release is intended only for package maintainers and
- others who cannot use the 0.2.2 stable series. All others should be
- using Tor 0.2.2.x or newer.
- The Tor 0.2.1.x series will reach formal end-of-life some time in
- early 2012; we will stop releasing patches for it then.
- o Major bugfixes (also included in 0.2.2.x):
- - Correctly sanity-check that we don't underflow on a memory
- allocation (and then assert) for hidden service introduction
- point decryption. Bug discovered by Dan Rosenberg. Fixes bug 4410;
- bugfix on 0.2.1.5-alpha.
- - Fix a heap overflow bug that could occur when trying to pull
- data into the first chunk of a buffer, when that chunk had
- already had some data drained from it. Fixes CVE-2011-2778;
- bugfix on 0.2.0.16-alpha. Reported by "Vektor".
- o Minor features:
- - Update to the December 6 2011 Maxmind GeoLite Country database.
- Changes in version 0.2.2.34 - 2011-10-26
- Tor 0.2.2.34 fixes a critical anonymity vulnerability where an attacker
- can deanonymize Tor users. Everybody should upgrade.
- The attack relies on four components: 1) Clients reuse their TLS cert
- when talking to different relays, so relays can recognize a user by
- the identity key in her cert. 2) An attacker who knows the client's
- identity key can probe each guard relay to see if that identity key
- is connected to that guard relay right now. 3) A variety of active
- attacks in the literature (starting from "Low-Cost Traffic Analysis
- of Tor" by Murdoch and Danezis in 2005) allow a malicious website to
- discover the guard relays that a Tor user visiting the website is using.
- 4) Clients typically pick three guards at random, so the set of guards
- for a given user could well be a unique fingerprint for her. This
- release fixes components #1 and #2, which is enough to block the attack;
- the other two remain as open research problems. Special thanks to
- "frosty_un" for reporting the issue to us!
- Clients should upgrade so they are no longer recognizable by the TLS
- certs they present. Relays should upgrade so they no longer allow a
- remote attacker to probe them to test whether unpatched clients are
- currently connected to them.
- This release also fixes several vulnerabilities that allow an attacker
- to enumerate bridge relays. Some bridge enumeration attacks still
- remain; see for example proposal 188.
- o Privacy/anonymity fixes (clients):
- - Clients and bridges no longer send TLS certificate chains on
- outgoing OR connections. Previously, each client or bridge would
- use the same cert chain for all outgoing OR connections until
- its IP address changes, which allowed any relay that the client
- or bridge contacted to determine which entry guards it is using.
- Fixes CVE-2011-2768. Bugfix on 0.0.9pre5; found by "frosty_un".
- - If a relay receives a CREATE_FAST cell on a TLS connection, it
- no longer considers that connection as suitable for satisfying a
- circuit EXTEND request. Now relays can protect clients from the
- CVE-2011-2768 issue even if the clients haven't upgraded yet.
- - Directory authorities no longer assign the Guard flag to relays
- that haven't upgraded to the above "refuse EXTEND requests
- to client connections" fix. Now directory authorities can
- protect clients from the CVE-2011-2768 issue even if neither
- the clients nor the relays have upgraded yet. There's a new
- "GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays" config option
- to let us transition smoothly, else tomorrow there would be no
- guard relays.
- o Privacy/anonymity fixes (bridge enumeration):
- - Bridge relays now do their directory fetches inside Tor TLS
- connections, like all the other clients do, rather than connecting
- directly to the DirPort like public relays do. Removes another
- avenue for enumerating bridges. Fixes bug 4115; bugfix on 0.2.0.35.
- - Bridges relays now build circuits for themselves in a more similar
- way to how clients build them. Removes another avenue for
- enumerating bridges. Fixes bug 4124; bugfix on 0.2.0.3-alpha,
- when bridges were introduced.
- - Bridges now refuse CREATE or CREATE_FAST cells on OR connections
- that they initiated. Relays could distinguish incoming bridge
- connections from client connections, creating another avenue for
- enumerating bridges. Fixes CVE-2011-2769. Bugfix on 0.2.0.3-alpha.
- Found by "frosty_un".
- o Major bugfixes:
- - Fix a crash bug when changing node restrictions while a DNS lookup
- is in-progress. Fixes bug 4259; bugfix on 0.2.2.25-alpha. Bugfix
- by "Tey'".
- - Don't launch a useless circuit after failing to use one of a
- hidden service's introduction points. Previously, we would
- launch a new introduction circuit, but not set the hidden service
- which that circuit was intended to connect to, so it would never
- actually be used. A different piece of code would then create a
- new introduction circuit correctly. Bug reported by katmagic and
- found by Sebastian Hahn. Bugfix on 0.2.1.13-alpha; fixes bug 4212.
- o Minor bugfixes:
- - Change an integer overflow check in the OpenBSD_Malloc code so
- that GCC is less likely to eliminate it as impossible. Patch
- from Mansour Moufid. Fixes bug 4059.
- - When a hidden service turns an extra service-side introduction
- circuit into a general-purpose circuit, free the rend_data and
- intro_key fields first, so we won't leak memory if the circuit
- is cannibalized for use as another service-side introduction
- circuit. Bugfix on 0.2.1.7-alpha; fixes bug 4251.
- - Bridges now skip DNS self-tests, to act a little more stealthily.
- Fixes bug 4201; bugfix on 0.2.0.3-alpha, which first introduced
- bridges. Patch by "warms0x".
- - Fix internal bug-checking logic that was supposed to catch
- failures in digest generation so that it will fail more robustly
- if we ask for a nonexistent algorithm. Found by Coverity Scan.
- Bugfix on 0.2.2.1-alpha; fixes Coverity CID 479.
- - Report any failure in init_keys() calls launched because our
- IP address has changed. Spotted by Coverity Scan. Bugfix on
- 0.1.1.4-alpha; fixes CID 484.
- o Minor bugfixes (log messages and documentation):
- - Remove a confusing dollar sign from the example fingerprint in the
- man page, and also make the example fingerprint a valid one. Fixes
- bug 4309; bugfix on 0.2.1.3-alpha.
- - The next version of Windows will be called Windows 8, and it has
- a major version of 6, minor version of 2. Correctly identify that
- version instead of calling it "Very recent version". Resolves
- ticket 4153; reported by funkstar.
- - Downgrade log messages about circuit timeout calibration from
- "notice" to "info": they don't require or suggest any human
- intervention. Patch from Tom Lowenthal. Fixes bug 4063;
- bugfix on 0.2.2.14-alpha.
- o Minor features:
- - Turn on directory request statistics by default and include them in
- extra-info descriptors. Don't break if we have no GeoIP database.
- Backported from 0.2.3.1-alpha; implements ticket 3951.
- - Update to the October 4 2011 Maxmind GeoLite Country database.
- Changes in version 0.2.1.31 - 2011-10-26
- Tor 0.2.1.31 backports important security and privacy fixes for
- oldstable. This release is intended only for package maintainers and
- others who cannot use the 0.2.2 stable series. All others should be
- using Tor 0.2.2.x or newer.
- o Security fixes (also included in 0.2.2.x):
- - Replace all potentially sensitive memory comparison operations
- with versions whose runtime does not depend on the data being
- compared. This will help resist a class of attacks where an
- adversary can use variations in timing information to learn
- sensitive data. Fix for one case of bug 3122. (Safe memcmp
- implementation by Robert Ransom based partially on code by DJB.)
- - Fix an assert in parsing router descriptors containing IPv6
- addresses. This one took down the directory authorities when
- somebody tried some experimental code. Bugfix on 0.2.1.3-alpha.
- o Privacy/anonymity fixes (also included in 0.2.2.x):
- - Clients and bridges no longer send TLS certificate chains on
- outgoing OR connections. Previously, each client or bridge would
- use the same cert chain for all outgoing OR connections until
- its IP address changes, which allowed any relay that the client
- or bridge contacted to determine which entry guards it is using.
- Fixes CVE-2011-2768. Bugfix on 0.0.9pre5; found by "frosty_un".
- - If a relay receives a CREATE_FAST cell on a TLS connection, it
- no longer considers that connection as suitable for satisfying a
- circuit EXTEND request. Now relays can protect clients from the
- CVE-2011-2768 issue even if the clients haven't upgraded yet.
- - Bridges now refuse CREATE or CREATE_FAST cells on OR connections
- that they initiated. Relays could distinguish incoming bridge
- connections from client connections, creating another avenue for
- enumerating bridges. Fixes CVE-2011-2769. Bugfix on 0.2.0.3-alpha.
- Found by "frosty_un".
- - When receiving a hidden service descriptor, check that it is for
- the hidden service we wanted. Previously, Tor would store any
- hidden service descriptors that a directory gave it, whether it
- wanted them or not. This wouldn't have let an attacker impersonate
- a hidden service, but it did let directories pre-seed a client
- with descriptors that it didn't want. Bugfix on 0.0.6.
- - Avoid linkability based on cached hidden service descriptors: forget
- all hidden service descriptors cached as a client when processing a
- SIGNAL NEWNYM command. Fixes bug 3000; bugfix on 0.0.6.
- - Make the bridge directory authority refuse to answer directory
- requests for "all" descriptors. It used to include bridge
- descriptors in its answer, which was a major information leak.
- Found by "piebeer". Bugfix on 0.2.0.3-alpha.
- - Don't attach new streams to old rendezvous circuits after SIGNAL
- NEWNYM. Previously, we would keep using an existing rendezvous
- circuit if it remained open (i.e. if it were kept open by a
- long-lived stream, or if a new stream were attached to it before
- Tor could notice that it was old and no longer in use). Bugfix on
- 0.1.1.15-rc; fixes bug 3375.
- o Minor bugfixes (also included in 0.2.2.x):
- - When we restart our relay, we might get a successful connection
- from the outside before we've started our reachability tests,
- triggering a warning: "ORPort found reachable, but I have no
- routerinfo yet. Failing to inform controller of success." This
- bug was harmless unless Tor is running under a controller
- like Vidalia, in which case the controller would never get a
- REACHABILITY_SUCCEEDED status event. Bugfix on 0.1.2.6-alpha;
- fixes bug 1172.
- - Build correctly on OSX with zlib 1.2.4 and higher with all warnings
- enabled. Fixes bug 1526.
- - Remove undocumented option "-F" from tor-resolve: it hasn't done
- anything since 0.2.1.16-rc.
- - Avoid signed/unsigned comparisons by making SIZE_T_CEILING unsigned.
- None of the cases where we did this before were wrong, but by making
- this change we avoid warnings. Fixes bug 2475; bugfix on 0.2.1.28.
- - Fix a rare crash bug that could occur when a client was configured
- with a large number of bridges. Fixes bug 2629; bugfix on
- 0.2.1.2-alpha. Bugfix by trac user "shitlei".
- - Correct the warning displayed when a rendezvous descriptor exceeds
- the maximum size. Fixes bug 2750; bugfix on 0.2.1.5-alpha. Found by
- John Brooks.
- - Fix an uncommon assertion failure when running with DNSPort under
- heavy load. Fixes bug 2933; bugfix on 0.2.0.1-alpha.
- - When warning about missing zlib development packages during compile,
- give the correct package names. Bugfix on 0.2.0.1-alpha.
- - Require that introduction point keys and onion keys have public
- exponent 65537. Bugfix on 0.2.0.10-alpha.
- - Do not crash when our configuration file becomes unreadable, for
- example due to a permissions change, between when we start up
- and when a controller calls SAVECONF. Fixes bug 3135; bugfix
- on 0.0.9pre6.
- - Fix warnings from GCC 4.6's "-Wunused-but-set-variable" option.
- Fixes bug 3208.
- - Always NUL-terminate the sun_path field of a sockaddr_un before
- passing it to the kernel. (Not a security issue: kernels are
- smart enough to reject bad sockaddr_uns.) Found by Coverity;
- CID #428. Bugfix on Tor 0.2.0.3-alpha.
- - Don't stack-allocate the list of supplementary GIDs when we're
- about to log them. Stack-allocating NGROUPS_MAX gid_t elements
- could take up to 256K, which is way too much stack. Found by
- Coverity; CID #450. Bugfix on 0.2.1.7-alpha.
- o Minor bugfixes (only in 0.2.1.x):
- - Resume using micro-version numbers in 0.2.1.x: our Debian packages
- rely on them. Bugfix on 0.2.1.30.
- - Use git revisions instead of svn revisions when generating our
- micro-version numbers. Bugfix on 0.2.1.15-rc; fixes bug 2402.
- o Minor features (also included in 0.2.2.x):
- - Adjust the expiration time on our SSL session certificates to
- better match SSL certs seen in the wild. Resolves ticket 4014.
- - Allow nameservers with IPv6 address. Resolves bug 2574.
- - Update to the October 4 2011 Maxmind GeoLite Country database.
- Changes in version 0.2.2.33 - 2011-09-13
- Tor 0.2.2.33 fixes several bugs, and includes a slight tweak to Tor's
- TLS handshake that makes relays and bridges that run this new version
- reachable from Iran again.
- o Major bugfixes:
- - Avoid an assertion failure when reloading a configuration with
- TrackExitHosts changes. Found and fixed by 'laruldan'. Fixes bug
- 3923; bugfix on 0.2.2.25-alpha.
- o Minor features (security):
- - Check for replays of the public-key encrypted portion of an
- INTRODUCE1 cell, in addition to the current check for replays of
- the g^x value. This prevents a possible class of active attacks
- by an attacker who controls both an introduction point and a
- rendezvous point, and who uses the malleability of AES-CTR to
- alter the encrypted g^x portion of the INTRODUCE1 cell. We think
- that these attacks are infeasible (requiring the attacker to send
- on the order of zettabytes of altered cells in a short interval),
- but we'd rather block them off in case there are any classes of
- this attack that we missed. Reported by Willem Pinckaers.
- o Minor features:
- - Adjust the expiration time on our SSL session certificates to
- better match SSL certs seen in the wild. Resolves ticket 4014.
- - Change the default required uptime for a relay to be accepted as
- a HSDir (hidden service directory) from 24 hours to 25 hours.
- Improves on 0.2.0.10-alpha; resolves ticket 2649.
- - Add a VoteOnHidServDirectoriesV2 config option to allow directory
- authorities to abstain from voting on assignment of the HSDir
- consensus flag. Related to bug 2649.
- - Update to the September 6 2011 Maxmind GeoLite Country database.
- o Minor bugfixes (documentation and log messages):
- - Correct the man page to explain that HashedControlPassword and
- CookieAuthentication can both be set, in which case either method
- is sufficient to authenticate to Tor. Bugfix on 0.2.0.7-alpha,
- when we decided to allow these config options to both be set. Issue
- raised by bug 3898.
- - Demote the 'replay detected' log message emitted when a hidden
- service receives the same Diffie-Hellman public key in two different
- INTRODUCE2 cells to info level. A normal Tor client can cause that
- log message during its normal operation. Bugfix on 0.2.1.6-alpha;
- fixes part of bug 2442.
- - Demote the 'INTRODUCE2 cell is too {old,new}' log message to info
- level. There is nothing that a hidden service's operator can do
- to fix its clients' clocks. Bugfix on 0.2.1.6-alpha; fixes part
- of bug 2442.
- - Clarify a log message specifying the characters permitted in
- HiddenServiceAuthorizeClient client names. Previously, the log
- message said that "[A-Za-z0-9+-_]" were permitted; that could have
- given the impression that every ASCII character between "+" and "_"
- was permitted. Now we say "[A-Za-z0-9+_-]". Bugfix on 0.2.1.5-alpha.
- o Build fixes:
- - Provide a substitute implementation of lround() for MSVC, which
- apparently lacks it. Patch from Gisle Vanem.
- - Clean up some code issues that prevented Tor from building on older
- BSDs. Fixes bug 3894; reported by "grarpamp".
- - Search for a platform-specific version of "ar" when cross-compiling.
- Should fix builds on iOS. Resolves bug 3909, found by Marco Bonetti.
- Changes in version 0.2.2.32 - 2011-08-27
- The Tor 0.2.2 release series is dedicated to the memory of Andreas
- Pfitzmann (1958-2010), a pioneer in anonymity and privacy research,
- a founder of the PETS community, a leader in our field, a mentor,
- and a friend. He left us with these words: "I had the possibility
- to contribute to this world that is not as it should be. I hope I
- could help in some areas to make the world a better place, and that
- I could also encourage other people to be engaged in improving the
- world. Please, stay engaged. This world needs you, your love, your
- initiative -- now I cannot be part of that anymore."
- Tor 0.2.2.32, the first stable release in the 0.2.2 branch, is finally
- ready. More than two years in the making, this release features improved
- client performance and hidden service reliability, better compatibility
- for Android, correct behavior for bridges that listen on more than
- one address, more extensible and flexible directory object handling,
- better reporting of network statistics, improved code security, and
- many many other features and bugfixes.
- o Major features (client performance):
- - When choosing which cells to relay first, relays now favor circuits
- that have been quiet recently, to provide lower latency for
- low-volume circuits. By default, relays enable or disable this
- feature based on a setting in the consensus. They can override
- this default by using the new "CircuitPriorityHalflife" config
- option. Design and code by Ian Goldberg, Can Tang, and Chris
- Alexander.
- - Directory authorities now compute consensus weightings that instruct
- clients how to weight relays flagged as Guard, Exit, Guard+Exit,
- and no flag. Clients use these weightings to distribute network load
- more evenly across these different relay types. The weightings are
- in the consensus so we can change them globally in the future. Extra
- thanks to "outofwords" for finding some nasty security bugs in
- the first implementation of this feature.
- o Major features (client performance, circuit build timeout):
- - Tor now tracks how long it takes to build client-side circuits
- over time, and adapts its timeout to local network performance.
- Since a circuit that takes a long time to build will also provide
- bad performance, we get significant latency improvements by
- discarding the slowest 20% of circuits. Specifically, Tor creates
- circuits more aggressively than usual until it has enough data
- points for a good timeout estimate. Implements proposal 151.
- - Circuit build timeout constants can be controlled by consensus
- parameters. We set good defaults for these parameters based on
- experimentation on broadband and simulated high-latency links.
- - Circuit build time learning can be disabled via consensus parameter
- or by the client via a LearnCircuitBuildTimeout config option. We
- also automatically disable circuit build time calculation if either
- AuthoritativeDirectory is set, or if we fail to write our state
- file. Implements ticket 1296.
- o Major features (relays use their capacity better):
- - Set SO_REUSEADDR socket option on all sockets, not just
- listeners. This should help busy exit nodes avoid running out of
- useable ports just because all the ports have been used in the
- near past. Resolves issue 2850.
- - Relays now save observed peak bandwidth throughput rates to their
- state file (along with total usage, which was already saved),
- so that they can determine their correct estimated bandwidth on
- restart. Resolves bug 1863, where Tor relays would reset their
- estimated bandwidth to 0 after restarting.
- - Lower the maximum weighted-fractional-uptime cutoff to 98%. This
- should give us approximately 40-50% more Guard-flagged nodes,
- improving the anonymity the Tor network can provide and also
- decreasing the dropoff in throughput that relays experience when
- they first get the Guard flag.
- - Directory authorities now take changes in router IP address and
- ORPort into account when determining router stability. Previously,
- if a router changed its IP or ORPort, the authorities would not
- treat it as having any downtime for the purposes of stability
- calculation, whereas clients would experience downtime since the
- change would take a while to propagate to them. Resolves issue 1035.
- - New AccelName and AccelDir options add support for dynamic OpenSSL
- hardware crypto acceleration engines.
- o Major features (relays control their load better):
- - Exit relays now try harder to block exit attempts from unknown
- relays, to make it harder for people to use them as one-hop proxies
- a la tortunnel. Controlled by the refuseunknownexits consensus
- parameter (currently enabled), or you can override it on your
- relay with the RefuseUnknownExits torrc option. Resolves bug 1751;
- based on a variant of proposal 163.
- - Add separate per-conn write limiting to go with the per-conn read
- limiting. We added a global write limit in Tor 0.1.2.5-alpha,
- but never per-conn write limits.
- - New consensus params "bwconnrate" and "bwconnburst" to let us
- rate-limit client connections as they enter the network. It's
- controlled in the consensus so we can turn it on and off for
- experiments. It's starting out off. Based on proposal 163.
- o Major features (controllers):
- - Export GeoIP information on bridge usage to controllers even if we
- have not yet been running for 24 hours. Now Vidalia bridge operators
- can get more accurate and immediate feedback about their
- contributions to the network.
- - Add an __OwningControllerProcess configuration option and a
- TAKEOWNERSHIP control-port command. Now a Tor controller can ensure
- that when it exits, Tor will shut down. Implements feature 3049.
- o Major features (directory authorities):
- - Directory authorities now create, vote on, and serve multiple
- parallel formats of directory data as part of their voting process.
- Partially implements Proposal 162: "Publish the consensus in
- multiple flavors".
- - Directory authorities now agree on and publish small summaries
- of router information that clients can use in place of regular
- server descriptors. This transition will allow Tor 0.2.3 clients
- to use far less bandwidth for downloading information about the
- network. Begins the implementation of Proposal 158: "Clients
- download consensus + microdescriptors".
- - The directory voting system is now extensible to use multiple hash
- algorithms for signatures and resource selection. Newer formats
- are signed with SHA256, with a possibility for moving to a better
- hash algorithm in the future.
- - Directory authorities can now vote on arbitrary integer values as
- part of the consensus process. This is designed to help set
- network-wide parameters. Implements proposal 167.
- o Major features and bugfixes (node selection):
- - Revise and reconcile the meaning of the ExitNodes, EntryNodes,
- ExcludeEntryNodes, ExcludeExitNodes, ExcludeNodes, and Strict*Nodes
- options. Previously, we had been ambiguous in describing what
- counted as an "exit" node, and what operations exactly "StrictNodes
- 0" would permit. This created confusion when people saw nodes built
- through unexpected circuits, and made it hard to tell real bugs from
- surprises. Now the intended behavior is:
- . "Exit", in the context of ExitNodes and ExcludeExitNodes, means
- a node that delivers user traffic outside the Tor network.
- . "Entry", in the context of EntryNodes, means a node used as the
- first hop of a multihop circuit. It doesn't include direct
- connections to directory servers.
- . "ExcludeNodes" applies to all nodes.
- . "StrictNodes" changes the behavior of ExcludeNodes only. When
- StrictNodes is set, Tor should avoid all nodes listed in
- ExcludeNodes, even when it will make user requests fail. When
- StrictNodes is *not* set, then Tor should follow ExcludeNodes
- whenever it can, except when it must use an excluded node to
- perform self-tests, connect to a hidden service, provide a
- hidden service, fulfill a .exit request, upload directory
- information, or fetch directory information.
- Collectively, the changes to implement the behavior fix bug 1090.
- - If EntryNodes, ExitNodes, ExcludeNodes, or ExcludeExitNodes
- change during a config reload, mark and discard all our origin
- circuits. This fix should address edge cases where we change the
- config options and but then choose a circuit that we created before
- the change.
- - Make EntryNodes config option much more aggressive even when
- StrictNodes is not set. Before it would prepend your requested
- entrynodes to your list of guard nodes, but feel free to use others
- after that. Now it chooses only from your EntryNodes if any of
- those are available, and only falls back to others if a) they're
- all down and b) StrictNodes is not set.
- - Now we refresh your entry guards from EntryNodes at each consensus
- fetch -- rather than just at startup and then they slowly rot as
- the network changes.
- - Add support for the country code "{??}" in torrc options like
- ExcludeNodes, to indicate all routers of unknown country. Closes
- bug 1094.
- - ExcludeNodes now takes precedence over EntryNodes and ExitNodes: if
- a node is listed in both, it's treated as excluded.
- - ExcludeNodes now applies to directory nodes -- as a preference if
- StrictNodes is 0, or an absolute requirement if StrictNodes is 1.
- Don't exclude all the directory authorities and set StrictNodes to 1
- unless you really want your Tor to break.
- - ExcludeNodes and ExcludeExitNodes now override exit enclaving.
- - ExcludeExitNodes now overrides .exit requests.
- - We don't use bridges listed in ExcludeNodes.
- - When StrictNodes is 1:
- . We now apply ExcludeNodes to hidden service introduction points
- and to rendezvous points selected by hidden service users. This
- can make your hidden service less reliable: use it with caution!
- . If we have used ExcludeNodes on ourself, do not try relay
- reachability self-tests.
- . If we have excluded all the directory authorities, we will not
- even try to upload our descriptor if we're a relay.
- . Do not honor .exit requests to an excluded node.
- - When the set of permitted nodes changes, we now remove any mappings
- introduced via TrackExitHosts to now-excluded nodes. Bugfix on
- 0.1.0.1-rc.
- - We never cannibalize a circuit that had excluded nodes on it, even
- if StrictNodes is 0. Bugfix on 0.1.0.1-rc.
- - Improve log messages related to excluded nodes.
- o Major features (misc):
- - Numerous changes, bugfixes, and workarounds from Nathan Freitas
- to help Tor build correctly for Android phones.
- - The options SocksPort, ControlPort, and so on now all accept a
- value "auto" that opens a socket on an OS-selected port. A
- new ControlPortWriteToFile option tells Tor to write its
- actual control port or ports to a chosen file. If the option
- ControlPortFileGroupReadable is set, the file is created as
- group-readable. Now users can run two Tor clients on the same
- system without needing to manually mess with parameters. Resolves
- part of ticket 3076.
- - Tor now supports tunneling all of its outgoing connections over
- a SOCKS proxy, using the SOCKS4Proxy and/or SOCKS5Proxy
- configuration options. Code by Christopher Davis.
- o Code security improvements:
- - Replace all potentially sensitive memory comparison operations
- with versions whose runtime does not depend on the data being
- compared. This will help resist a class of attacks where an
- adversary can use variations in timing information to learn
- sensitive data. Fix for one case of bug 3122. (Safe memcmp
- implementation by Robert Ransom based partially on code by DJB.)
- - Enable Address Space Layout Randomization (ASLR) and Data Execution
- Prevention (DEP) by default on Windows to make it harder for
- attackers to exploit vulnerabilities. Patch from John Brooks.
- - New "--enable-gcc-hardening" ./configure flag (off by default)
- to turn on gcc compile time hardening options. It ensures
- that signed ints have defined behavior (-fwrapv), enables
- -D_FORTIFY_SOURCE=2 (requiring -O2), adds stack smashing protection
- with canaries (-fstack-protector-all), turns on ASLR protection if
- supported by the kernel (-fPIE, -pie), and adds additional security
- related warnings. Verified to work on Mac OS X and Debian Lenny.
- - New "--enable-linker-hardening" ./configure flag (off by default)
- to turn on ELF specific hardening features (relro, now). This does
- not work with Mac OS X or any other non-ELF binary format.
- - Always search the Windows system directory for system DLLs, and
- nowhere else. Bugfix on 0.1.1.23; fixes bug 1954.
- - New DisableAllSwap option. If set to 1, Tor will attempt to lock all
- current and future memory pages via mlockall(). On supported
- platforms (modern Linux and probably BSD but not Windows or OS X),
- this should effectively disable any and all attempts to page out
- memory. This option requires that you start your Tor as root --
- if you use DisableAllSwap, please consider using the User option
- to properly reduce the privileges of your Tor.
- o Major bugfixes (crashes):
- - Fix crash bug on platforms where gmtime and localtime can return
- NULL. Windows 7 users were running into this one. Fixes part of bug
- 2077. Bugfix on all versions of Tor. Found by boboper.
- - Introduce minimum/maximum values that clients will believe
- from the consensus. Now we'll have a better chance to avoid crashes
- or worse when a consensus param has a weird value.
- - Fix a rare crash bug that could occur when a client was configured
- with a large number of bridges. Fixes bug 2629; bugfix on
- 0.2.1.2-alpha. Bugfix by trac user "shitlei".
- - Do not crash when our configuration file becomes unreadable, for
- example due to a permissions change, between when we start up
- and when a controller calls SAVECONF. Fixes bug 3135; bugfix
- on 0.0.9pre6.
- - If we're in the pathological case where there's no exit bandwidth
- but there is non-exit bandwidth, or no guard bandwidth but there
- is non-guard bandwidth, don't crash during path selection. Bugfix
- on 0.2.0.3-alpha.
- - Fix a crash bug when trying to initialize the evdns module in
- Libevent 2. Bugfix on 0.2.1.16-rc.
- o Major bugfixes (stability):
- - Fix an assert in parsing router descriptors containing IPv6
- addresses. This one took down the directory authorities when
- somebody tried some experimental code. Bugfix on 0.2.1.3-alpha.
- - Fix an uncommon assertion failure when running with DNSPort under
- heavy load. Fixes bug 2933; bugfix on 0.2.0.1-alpha.
- - Treat an unset $HOME like an empty $HOME rather than triggering an
- assert. Bugfix on 0.0.8pre1; fixes bug 1522.
- - More gracefully handle corrupt state files, removing asserts
- in favor of saving a backup and resetting state.
- - Instead of giving an assertion failure on an internal mismatch
- on estimated freelist size, just log a BUG warning and try later.
- Mitigates but does not fix bug 1125.
- - Fix an assert that got triggered when using the TestingTorNetwork
- configuration option and then issuing a GETINFO config-text control
- command. Fixes bug 2250; bugfix on 0.2.1.2-alpha.
- - If the cached cert file is unparseable, warn but don't exit.
- o Privacy fixes (relays/bridges):
- - Don't list Windows capabilities in relay descriptors. We never made
- use of them, and maybe it's a bad idea to publish them. Bugfix
- on 0.1.1.8-alpha.
- - If the Nickname configuration option isn't given, Tor would pick a
- nickname based on the local hostname as the nickname for a relay.
- Because nicknames are not very important in today's Tor and the
- "Unnamed" nickname has been implemented, this is now problematic
- behavior: It leaks information about the hostname without being
- useful at all. Fixes bug 2979; bugfix on 0.1.2.2-alpha, which
- introduced the Unnamed nickname. Reported by tagnaq.
- - Maintain separate TLS contexts and certificates for incoming and
- outgoing connections in bridge relays. Previously we would use the
- same TLS contexts and certs for incoming and outgoing connections.
- Bugfix on 0.2.0.3-alpha; addresses bug 988.
- - Maintain separate identity keys for incoming and outgoing TLS
- contexts in bridge relays. Previously we would use the same
- identity keys for incoming and outgoing TLS contexts. Bugfix on
- 0.2.0.3-alpha; addresses the other half of bug 988.
- - Make the bridge directory authority refuse to answer directory
- requests for "all descriptors". It used to include bridge
- descriptors in its answer, which was a major information leak.
- Found by "piebeer". Bugfix on 0.2.0.3-alpha.
- o Privacy fixes (clients):
- - When receiving a hidden service descriptor, check that it is for
- the hidden service we wanted. Previously, Tor would store any
- hidden service descriptors that a directory gave it, whether it
- wanted them or not. This wouldn't have let an attacker impersonate
- a hidden service, but it did let directories pre-seed a client
- with descriptors that it didn't want. Bugfix on 0.0.6.
- - Start the process of disabling ".exit" address notation, since it
- can be used for a variety of esoteric application-level attacks
- on users. To reenable it, set "AllowDotExit 1" in your torrc. Fix
- on 0.0.9rc5.
- - Reject attempts at the client side to open connections to private
- IP addresses (like 127.0.0.1, 10.0.0.1, and so on) with
- a randomly chosen exit node. Attempts to do so are always
- ill-defined, generally prevented by exit policies, and usually
- in error. This will also help to detect loops in transparent
- proxy configurations. You can disable this feature by setting
- "ClientRejectInternalAddresses 0" in your torrc.
- - Log a notice when we get a new control connection. Now it's easier
- for security-conscious users to recognize when a local application
- is knocking on their controller door. Suggested by bug 1196.
- o Privacy fixes (newnym):
- - Avoid linkability based on cached hidden service descriptors: forget
- all hidden service descriptors cached as a client when processing a
- SIGNAL NEWNYM command. Fixes bug 3000; bugfix on 0.0.6.
- - On SIGHUP, do not clear out all TrackHostExits mappings, client
- DNS cache entries, and virtual address mappings: that's what
- NEWNYM is for. Fixes bug 1345; bugfix on 0.1.0.1-rc.
- - Don't attach new streams to old rendezvous circuits after SIGNAL
- NEWNYM. Previously, we would keep using an existing rendezvous
- circuit if it remained open (i.e. if it were kept open by a
- long-lived stream, or if a new stream were attached to it before
- Tor could notice that it was old and no longer in use). Bugfix on
- 0.1.1.15-rc; fixes bug 3375.
- o Major bugfixes (relay bandwidth accounting):
- - Fix a bug that could break accounting on 64-bit systems with large
- time_t values, making them hibernate for impossibly long intervals.
- Fixes bug 2146. Bugfix on 0.0.9pre6; fix by boboper.
- - Fix a bug in bandwidth accounting that could make us use twice
- the intended bandwidth when our interval start changes due to
- daylight saving time. Now we tolerate skew in stored vs computed
- interval starts: if the start of the period changes by no more than
- 50% of the period's duration, we remember bytes that we transferred
- in the old period. Fixes bug 1511; bugfix on 0.0.9pre5.
- o Major bugfixes (bridges):
- - Bridges now use "reject *:*" as their default exit policy. Bugfix
- on 0.2.0.3-alpha. Fixes bug 1113.
- - If you configure your bridge with a known identity fingerprint,
- and the bridge authority is unreachable (as it is in at least
- one country now), fall back to directly requesting the descriptor
- from the bridge. Finishes the feature started in 0.2.0.10-alpha;
- closes bug 1138.
- - Fix a bug where bridge users who configure the non-canonical
- address of a bridge automatically switch to its canonical
- address. If a bridge listens at more than one address, it
- should be able to advertise those addresses independently and
- any non-blocked addresses should continue to work. Bugfix on Tor
- 0.2.0.3-alpha. Fixes bug 2510.
- - If you configure Tor to use bridge A, and then quit and
- configure Tor to use bridge B instead (or if you change Tor
- to use bridge B via the controller), it would happily continue
- to use bridge A if it's still reachable. While this behavior is
- a feature if your goal is connectivity, in some scenarios it's a
- dangerous bug. Bugfix on Tor 0.2.0.1-alpha; fixes bug 2511.
- - When the controller configures a new bridge, don't wait 10 to 60
- seconds before trying to fetch its descriptor. Bugfix on
- 0.2.0.3-alpha; fixes bug 3198 (suggested by 2355).
- o Major bugfixes (directory authorities):
- - Many relays have been falling out of the consensus lately because
- not enough authorities know about their descriptor for them to get
- a majority of votes. When we deprecated the v2 directory protocol,
- we got rid of the only way that v3 authorities can hear from each
- other about other descriptors. Now authorities examine every v3
- vote for new descriptors, and fetch them from that authority. Bugfix
- on 0.2.1.23.
- - Authorities could be tricked into giving out the Exit flag to relays
- that didn't allow exiting to any ports. This bug could screw
- with load balancing and stats. Bugfix on 0.1.1.6-alpha; fixes bug
- 1238. Bug discovered by Martin Kowalczyk.
- - If all authorities restart at once right before a consensus vote,
- nobody will vote about "Running", and clients will get a consensus
- with no usable relays. Instead, authorities refuse to build a
- consensus if this happens. Bugfix on 0.2.0.10-alpha; fixes bug 1066.
- o Major bugfixes (stream-level fairness):
- - When receiving a circuit-level SENDME for a blocked circuit, try
- to package cells fairly from all the streams that had previously
- been blocked on that circuit. Previously, we had started with the
- oldest stream, and allowed each stream to potentially exhaust
- the circuit's package window. This gave older streams on any
- given circuit priority over newer ones. Fixes bug 1937. Detected
- originally by Camilo Viecco. This bug was introduced before the
- first Tor release, in svn commit r152: it is the new winner of
- the longest-lived bug prize.
- - Fix a stream fairness bug that would cause newer streams on a given
- circuit to get preference when reading bytes from the origin or
- destination. Fixes bug 2210. Fix by Mashael AlSabah. This bug was
- introduced before the first Tor release, in svn revision r152.
- - When the exit relay got a circuit-level sendme cell, it started
- reading on the exit streams, even if had 500 cells queued in the
- circuit queue already, so the circuit queue just grew and grew in
- some cases. We fix this by not re-enabling reading on receipt of a
- sendme cell when the cell queue is blocked. Fixes bug 1653. Bugfix
- on 0.2.0.1-alpha. Detected by Mashael AlSabah. Original patch by
- "yetonetime".
- - Newly created streams were allowed to read cells onto circuits,
- even if the circuit's cell queue was blocked and waiting to drain.
- This created potential unfairness, as older streams would be
- blocked, but newer streams would gladly fill the queue completely.
- We add code to detect this situation and prevent any stream from
- getting more than one free cell. Bugfix on 0.2.0.1-alpha. Partially
- fixes bug 1298.
- o Major bugfixes (hidden services):
- - Apply circuit timeouts to opened hidden-service-related circuits
- based on the correct start time. Previously, we would apply the
- circuit build timeout based on time since the circuit's creation;
- it was supposed to be applied based on time since the circuit
- entered its current state. Bugfix on 0.0.6; fixes part of bug 1297.
- - Improve hidden service robustness: When we find that we have
- extended a hidden service's introduction circuit to a relay not
- listed as an introduction point in the HS descriptor we currently
- have, retry with an introduction point from the current
- descriptor. Previously we would just give up. Fixes bugs 1024 and
- 1930; bugfix on 0.2.0.10-alpha.
- - Directory authorities now use data collected from their own
- uptime observations when choosing whether to assign the HSDir flag
- to relays, instead of trusting the uptime value the relay reports in
- its descriptor. This change helps prevent an attack where a small
- set of nodes with frequently-changing identity keys can blackhole
- a hidden service. (Only authorities need upgrade; others will be
- fine once they do.) Bugfix on 0.2.0.10-alpha; fixes bug 2709.
- - Stop assigning the HSDir flag to relays that disable their
- DirPort (and thus will refuse to answer directory requests). This
- fix should dramatically improve the reachability of hidden services:
- hidden services and hidden service clients pick six HSDir relays
- to store and retrieve the hidden service descriptor, and currently
- about half of the HSDir relays will refuse to work. Bugfix on
- 0.2.0.10-alpha; fixes part of bug 1693.
- o Major bugfixes (misc):
- - Clients now stop trying to use an exit node associated with a given
- destination by TrackHostExits if they fail to reach that exit node.
- Fixes bug 2999. Bugfix on 0.2.0.20-rc.
- - Fix a regression that caused Tor to rebind its ports if it receives
- SIGHUP while hibernating. Bugfix in 0.1.1.6-alpha; closes bug 919.
- - Remove an extra pair of quotation marks around the error
- message in control-port STATUS_GENERAL BUG events. Bugfix on
- 0.1.2.6-alpha; fixes bug 3732.
- o Minor features (relays):
- - Ensure that no empty [dirreq-](read|write)-history lines are added
- to an extrainfo document. Implements ticket 2497.
- - When bandwidth accounting is enabled, be more generous with how
- much bandwidth we'll use up before entering "soft hibernation".
- Previously, we'd refuse new connections and circuits once we'd
- used up 95% of our allotment. Now, we use up 95% of our allotment,
- AND make sure that we have no more than 500MB (or 3 hours of
- expected traffic, whichever is lower) remaining before we enter
- soft hibernation.
- - Relays now log the reason for publishing a new relay descriptor,
- so we have a better chance of hunting down instances of bug 1810.
- Resolves ticket 3252.
- - Log a little more clearly about the times at which we're no longer
- accepting new connections (e.g. due to hibernating). Resolves
- bug 2181.
- - When AllowSingleHopExits is set, print a warning to explain to the
- relay operator why most clients are avoiding her relay.
- - Send END_STREAM_REASON_NOROUTE in response to EHOSTUNREACH errors.
- Clients before 0.2.1.27 didn't handle NOROUTE correctly, but such
- clients are already deprecated because of security bugs.
- o Minor features (network statistics):
- - Directory mirrors that set "DirReqStatistics 1" write statistics
- about directory requests to disk every 24 hours. As compared to the
- "--enable-geoip-stats" ./configure flag in 0.2.1.x, there are a few
- improvements: 1) stats are written to disk exactly every 24 hours;
- 2) estimated shares of v2 and v3 requests are determined as mean
- values, not at the end of a measurement period; 3) unresolved
- requests are listed with country code '??'; 4) directories also
- measure download times.
- - Exit nodes that set "ExitPortStatistics 1" write statistics on the
- number of exit streams and transferred bytes per port to disk every
- 24 hours.
- - Relays that set "CellStatistics 1" write statistics on how long
- cells spend in their circuit queues to disk every 24 hours.
- - Entry nodes that set "EntryStatistics 1" write statistics on the
- rough number and origins of connecting clients to disk every 24
- hours.
- - Relays that write any of the above statistics to disk and set
- "ExtraInfoStatistics 1" include the past 24 hours of statistics in
- their extra-info documents. Implements proposal 166.
- o Minor features (GeoIP and statistics):
- - Provide a log message stating which geoip file we're parsing
- instead of just stating that we're parsing the geoip file.
- Implements ticket 2432.
- - Make sure every relay writes a state file at least every 12 hours.
- Previously, a relay could go for weeks without writing its state
- file, and on a crash could lose its bandwidth history, capacity
- estimates, client country statistics, and so on. Addresses bug 3012.
- - Relays report the number of bytes spent on answering directory
- requests in extra-info descriptors similar to {read,write}-history.
- Implements enhancement 1790.
- - Report only the top 10 ports in exit-port stats in order not to
- exceed the maximum extra-info descriptor length of 50 KB. Implements
- task 2196.
- - If writing the state file to disk fails, wait up to an hour before
- retrying again, rather than trying again each second. Fixes bug
- 2346; bugfix on Tor 0.1.1.3-alpha.
- - Delay geoip stats collection by bridges for 6 hours, not 2 hours,
- when we switch from being a public relay to a bridge. Otherwise
- there will still be clients that see the relay in their consensus,
- and the stats will end up wrong. Bugfix on 0.2.1.15-rc; fixes
- bug 932.
- - Update to the August 2 2011 Maxmind GeoLite Country database.
- o Minor features (clients):
- - When expiring circuits, use microsecond timers rather than
- one-second timers. This can avoid an unpleasant situation where a
- circuit is launched near the end of one second and expired right
- near the beginning of the next, and prevent fluctuations in circuit
- timeout values.
- - If we've configured EntryNodes and our network goes away and/or all
- our entrynodes get marked down, optimistically retry them all when
- a new socks application request appears. Fixes bug 1882.
- - Always perform router selections using weighted relay bandwidth,
- even if we don't need a high capacity circuit at the time. Non-fast
- circuits now only differ from fast ones in that they can use relays
- not marked with the Fast flag. This "feature" could turn out to
- be a horrible bug; we should investigate more before it goes into
- a stable release.
- - When we run out of directory information such that we can't build
- circuits, but then get enough that we can build circuits, log when
- we actually construct a circuit, so the user has a better chance of
- knowing what's going on. Fixes bug 1362.
- - Log SSL state transitions at debug level during handshake, and
- include SSL states in error messages. This may help debug future
- SSL handshake issues.
- o Minor features (directory authorities):
- - When a router changes IP address or port, authorities now launch
- a new reachability test for it. Implements ticket 1899.
- - Directory authorities now reject relays running any versions of
- Tor between 0.2.1.3-alpha and 0.2.1.18 inclusive; they have
- known bugs that keep RELAY_EARLY cells from working on rendezvous
- circuits. Followup to fix for bug 2081.
- - Directory authorities now reject relays running any version of Tor
- older than 0.2.0.26-rc. That version is the earliest that fetches
- current directory information correctly. Fixes bug 2156.
- - Directory authorities now do an immediate reachability check as soon
- as they hear about a new relay. This change should slightly reduce
- the time between setting up a relay and getting listed as running
- in the consensus. It should also improve the time between setting
- up a bridge and seeing use by bridge users.
- - Directory authorities no longer launch a TLS connection to every
- relay as they startup. Now that we have 2k+ descriptors cached,
- the resulting network hiccup is becoming a burden. Besides,
- authorities already avoid voting about Running for the first half
- hour of their uptime.
- - Directory authorities now log the source of a rejected POSTed v3
- networkstatus vote, so we can track failures better.
- - Backport code from 0.2.3.x that allows directory authorities to
- clean their microdescriptor caches. Needed to resolve bug 2230.
- o Minor features (hidden services):
- - Use computed circuit-build timeouts to decide when to launch
- parallel introduction circuits for hidden services. (Previously,
- we would retry after 15 seconds.)
- - Don't allow v0 hidden service authorities to act as clients.
- Required by fix for bug 3000.
- - Ignore SIGNAL NEWNYM commands on relay-only Tor instances. Required
- by fix for bug 3000.
- - Make hidden services work better in private Tor networks by not
- requiring any uptime to join the hidden service descriptor
- DHT. Implements ticket 2088.
- - Log (at info level) when purging pieces of hidden-service-client
- state because of SIGNAL NEWNYM.
- o Minor features (controller interface):
- - New "GETINFO net/listeners/(type)" controller command to return
- a list of addresses and ports that are bound for listeners for a
- given connection type. This is useful when the user has configured
- "SocksPort auto" and the controller needs to know which port got
- chosen. Resolves another part of ticket 3076.
- - Have the controller interface give a more useful message than
- "Internal Error" in response to failed GETINFO requests.
- - Add a TIMEOUT_RATE keyword to the BUILDTIMEOUT_SET control port
- event, to give information on the current rate of circuit timeouts
- over our stored history.
- - The 'EXTENDCIRCUIT' control port command can now be used with
- a circ id of 0 and no path. This feature will cause Tor to build
- a new 'fast' general purpose circuit using its own path selection
- algorithms.
- - Added a BUILDTIMEOUT_SET controller event to describe changes
- to the circuit build timeout.
- - New controller command "getinfo config-text". It returns the
- contents that Tor would write if you send it a SAVECONF command,
- so the controller can write the file to disk itself.
- o Minor features (controller protocol):
- - Add a new ControlSocketsGroupWritable configuration option: when
- it is turned on, ControlSockets are group-writeable by the default
- group of the current user. Patch by Jérémy Bobbio; implements
- ticket 2972.
- - Tor now refuses to create a ControlSocket in a directory that is
- world-readable (or group-readable if ControlSocketsGroupWritable
- is 0). This is necessary because some operating systems do not
- enforce permissions on an AF_UNIX sockets. Permissions on the
- directory holding the socket, however, seems to work everywhere.
- - Warn when CookieAuthFileGroupReadable is set but CookieAuthFile is
- not. This would lead to a cookie that is still not group readable.
- Closes bug 1843. Suggested by katmagic.
- - Future-proof the controller protocol a bit by ignoring keyword
- arguments we do not recognize.
- o Minor features (more useful logging):
- - Revise most log messages that refer to nodes by nickname to
- instead use the "$key=nickname at address" format. This should be
- more useful, especially since nicknames are less and less likely
- to be unique. Resolves ticket 3045.
- - When an HTTPS proxy reports "403 Forbidden", we now explain
- what it means rather than calling it an unexpected status code.
- Closes bug 2503. Patch from Michael Yakubovich.
- - Rate-limit a warning about failures to download v2 networkstatus
- documents. Resolves part of bug 1352.
- - Rate-limit the "your application is giving Tor only an IP address"
- warning. Addresses bug 2000; bugfix on 0.0.8pre2.
- - Rate-limit "Failed to hand off onionskin" warnings.
- - When logging a rate-limited warning, we now mention how many messages
- got suppressed since the last warning.
- - Make the formerly ugly "2 unknown, 7 missing key, 0 good, 0 bad,
- 2 no signature, 4 required" messages about consensus signatures
- easier to read, and make sure they get logged at the same severity
- as the messages explaining which keys are which. Fixes bug 1290.
- - Don't warn when we have a consensus that we can't verify because
- of missing certificates, unless those certificates are ones
- that we have been trying and failing to download. Fixes bug 1145.
- o Minor features (log domains):
- - Add documentation for configuring logging at different severities in
- different log domains. We've had this feature since 0.2.1.1-alpha,
- but for some reason it never made it into the manpage. Fixes
- bug 2215.
- - Make it simpler to specify "All log domains except for A and B".
- Previously you needed to say "[*,~A,~B]". Now you can just say
- "[~A,~B]".
- - Add a "LogMessageDomains 1" option to include the domains of log
- messages along with the messages. Without this, there's no way
- to use log domains without reading the source or doing a lot
- of guessing.
- - Add a new "Handshake" log domain for activities that happen
- during the TLS handshake.
- o Minor features (build process):
- - Make compilation with clang possible when using
- "--enable-gcc-warnings" by removing two warning options that clang
- hasn't implemented yet and by fixing a few warnings. Resolves
- ticket 2696.
- - Detect platforms that brokenly use a signed size_t, and refuse to
- build there. Found and analyzed by doorss and rransom.
- - Fix a bunch of compile warnings revealed by mingw with gcc 4.5.
- Resolves bug 2314.
- - Add support for statically linking zlib by specifying
- "--enable-static-zlib", to go with our support for statically
- linking openssl and libevent. Resolves bug 1358.
- - Instead of adding the svn revision to the Tor version string, report
- the git commit (when we're building from a git checkout).
- - Rename the "log.h" header to "torlog.h" so as to conflict with fewer
- system headers.
- - New --digests command-line switch to output the digests of the
- source files Tor was built with.
- - Generate our manpage and HTML documentation using Asciidoc. This
- change should make it easier to maintain the documentation, and
- produce nicer HTML. The build process fails if asciidoc cannot
- be found and building with asciidoc isn't disabled (via the
- "--disable-asciidoc" argument to ./configure. Skipping the manpage
- speeds up the build considerably.
- o Minor features (options / torrc):
- - Warn when the same option is provided more than once in a torrc
- file, on the command line, or in a single SETCONF statement, and
- the option is one that only accepts a single line. Closes bug 1384.
- - Warn when the user configures two HiddenServiceDir lines that point
- to the same directory. Bugfix on 0.0.6 (the version introducing
- HiddenServiceDir); fixes bug 3289.
- - Add new "perconnbwrate" and "perconnbwburst" consensus params to
- do individual connection-level rate limiting of clients. The torrc
- config options with the same names trump the consensus params, if
- both are present. Replaces the old "bwconnrate" and "bwconnburst"
- consensus params which were broken from 0.2.2.7-alpha through
- 0.2.2.14-alpha. Closes bug 1947.
- - New config option "WarnUnsafeSocks 0" disables the warning that
- occurs whenever Tor receives a socks handshake using a version of
- the socks protocol that can only provide an IP address (rather
- than a hostname). Setups that do DNS locally over Tor are fine,
- and we shouldn't spam the logs in that case.
- - New config option "CircuitStreamTimeout" to override our internal
- timeout schedule for how many seconds until we detach a stream from
- a circuit and try a new circuit. If your network is particularly
- slow, you might want to set this to a number like 60.
- - New options for SafeLogging to allow scrubbing only log messages
- generated while acting as a relay. Specify "SafeLogging relay" if
- you want to ensure that only messages known to originate from
- client use of the Tor process will be logged unsafely.
- - Time and memory units in the configuration file can now be set to
- fractional units. For example, "2.5 GB" is now a valid value for
- AccountingMax.
- - Support line continuations in the torrc config file. If a line
- ends with a single backslash character, the newline is ignored, and
- the configuration value is treated as continuing on the next line.
- Resolves bug 1929.
- o Minor features (unit tests):
- - Revise our unit tests to use the "tinytest" framework, so we
- can run tests in their own processes, have smarter setup/teardown
- code, and so on. The unit test code has moved to its own
- subdirectory, and has been split into multiple modules.
- - Add a unit test for cross-platform directory-listing code.
- - Add some forgotten return value checks during unit tests. Found
- by coverity.
- - Use GetTempDir to find the proper temporary directory location on
- Windows when generating temporary files for the unit tests. Patch
- by Gisle Vanem.
- o Minor features (misc):
- - The "torify" script now uses torsocks where available.
- - Make Libevent log messages get delivered to controllers later,
- and not from inside the Libevent log handler. This prevents unsafe
- reentrant Libevent calls while still letting the log messages
- get through.
- - Certain Tor clients (such as those behind check.torproject.org) may
- want to fetch the consensus in an extra early manner. To enable this
- a user may now set FetchDirInfoExtraEarly to 1. This also depends on
- setting FetchDirInfoEarly to 1. Previous behavior will stay the same
- as only certain clients who must have this information sooner should
- set this option.
- - Expand homedirs passed to tor-checkkey. This should silence a
- coverity complaint about passing a user-supplied string into
- open() without checking it.
- - Make sure to disable DirPort if running as a bridge. DirPorts aren't
- used on bridges, and it makes bridge scanning somewhat easier.
- - Create the /var/run/tor directory on startup on OpenSUSE if it is
- not already created. Patch from Andreas Stieger. Fixes bug 2573.
- o Minor bugfixes (relays):
- - When a relay decides that its DNS is too broken for it to serve
- as an exit server, it advertised itself as a non-exit, but
- continued to act as an exit. This could create accidental
- partitioning opportunities for users. Instead, if a relay is
- going to advertise reject *:* as its exit policy, it should
- really act with exit policy "reject *:*". Fixes bug 2366.
- Bugfix on Tor 0.1.2.5-alpha. Bugfix by user "postman" on trac.
- - Publish a router descriptor even if generating an extra-info
- descriptor fails. Previously we would not publish a router
- descriptor without an extra-info descriptor; this can cause fast
- exit relays collecting exit-port statistics to drop from the
- consensus. Bugfix on 0.1.2.9-rc; fixes bug 2195.
- - When we're trying to guess whether we know our IP address as
- a relay, we would log various ways that we failed to guess
- our address, but never log that we ended up guessing it
- successfully. Now add a log line to help confused and anxious
- relay operators. Bugfix on 0.1.2.1-alpha; fixes bug 1534.
- - For bandwidth accounting, calculate our expected bandwidth rate
- based on the time during which we were active and not in
- soft-hibernation during the last interval. Previously, we were
- also considering the time spent in soft-hibernation. If this
- was a long time, we would wind up underestimating our bandwidth
- by a lot, and skewing our wakeup time towards the start of the
- accounting interval. Fixes bug 1789. Bugfix on 0.0.9pre5.
- - Demote a confusing TLS warning that relay operators might get when
- someone tries to talk to their ORPort. It is not the operator's
- fault, nor can they do anything about it. Fixes bug 1364; bugfix
- on 0.2.0.14-alpha.
- - Change "Application request when we're believed to be offline."
- notice to "Application request when we haven't used client
- functionality lately.", to clarify that it's not an error. Bugfix
- on 0.0.9.3; fixes bug 1222.
- o Minor bugfixes (bridges):
- - When a client starts or stops using bridges, never use a circuit
- that was built before the configuration change. This behavior could
- put at risk a user who uses bridges to ensure that her traffic
- only goes to the chosen addresses. Bugfix on 0.2.0.3-alpha; fixes
- bug 3200.
- - Do not reset the bridge descriptor download status every time we
- re-parse our configuration or get a configuration change. Fixes
- bug 3019; bugfix on 0.2.0.3-alpha.
- - Users couldn't configure a regular relay to be their bridge. It
- didn't work because when Tor fetched the bridge descriptor, it found
- that it already had it, and didn't realize that the purpose of the
- descriptor had changed. Now we replace routers with a purpose other
- than bridge with bridge descriptors when fetching them. Bugfix on
- 0.1.1.9-alpha. Fixes bug 1776.
- - In the special case where you configure a public exit relay as your
- bridge, Tor would be willing to use that exit relay as the last
- hop in your circuit as well. Now we fail that circuit instead.
- Bugfix on 0.2.0.12-alpha. Fixes bug 2403. Reported by "piebeer".
- o Minor bugfixes (clients):
- - We now ask the other side of a stream (the client or the exit)
- for more data on that stream when the amount of queued data on
- that stream dips low enough. Previously, we wouldn't ask the
- other side for more data until either it sent us more data (which
- it wasn't supposed to do if it had exhausted its window!) or we
- had completely flushed all our queued data. This flow control fix
- should improve throughput. Fixes bug 2756; bugfix on the earliest
- released versions of Tor (svn commit r152).
- - When a client finds that an origin circuit has run out of 16-bit
- stream IDs, we now mark it as unusable for new streams. Previously,
- we would try to close the entire circuit. Bugfix on 0.0.6.
- - Make it explicit that we don't cannibalize one-hop circuits. This
- happens in the wild, but doesn't turn out to be a problem because
- we fortunately don't use those circuits. Many thanks to outofwords
- for the initial analysis and to swissknife who confirmed that
- two-hop circuits are actually created.
- - Resolve an edge case in path weighting that could make us misweight
- our relay selection. Fixes bug 1203; bugfix on 0.0.8rc1.
- - Make the DNSPort option work with libevent 2.x. Don't alter the
- behavior for libevent 1.x. Fixes bug 1143. Found by SwissTorExit.
- o Minor bugfixes (directory authorities):
- - Make directory authorities more accurate at recording when
- relays that have failed several reachability tests became
- unreachable, so we can provide more accuracy at assigning Stable,
- Guard, HSDir, etc flags. Bugfix on 0.2.0.6-alpha. Resolves bug 2716.
- - Directory authorities are now more robust to hops back in time
- when calculating router stability. Previously, if a run of uptime
- or downtime appeared to be negative, the calculation could give
- incorrect results. Bugfix on 0.2.0.6-alpha; noticed when fixing
- bug 1035.
- - Directory authorities will now attempt to download consensuses
- if their own efforts to make a live consensus have failed. This
- change means authorities that restart will fetch a valid
- consensus, and it means authorities that didn't agree with the
- current consensus will still fetch and serve it if it has enough
- signatures. Bugfix on 0.2.0.9-alpha; fixes bug 1300.
- - Never vote for a server as "Running" if we have a descriptor for
- it claiming to be hibernating, and that descriptor was published
- more recently than our last contact with the server. Bugfix on
- 0.2.0.3-alpha; fixes bug 911.
- - Directory authorities no longer change their opinion of, or vote on,
- whether a router is Running, unless they have themselves been
- online long enough to have some idea. Bugfix on 0.2.0.6-alpha.
- Fixes bug 1023.
- o Minor bugfixes (hidden services):
- - Log malformed requests for rendezvous descriptors as protocol
- warnings, not warnings. Also, use a more informative log message
- in case someone sees it at log level warning without prior
- info-level messages. Fixes bug 2748; bugfix on 0.2.0.10-alpha.
- - Accept hidden service descriptors if we think we might be a hidden
- service directory, regardless of what our consensus says. This
- helps robustness, since clients and hidden services can sometimes
- have a more up-to-date view of the network consensus than we do,
- and if they think that the directory authorities list us a HSDir,
- we might actually be one. Related to bug 2732; bugfix on
- 0.2.0.10-alpha.
- - Correct the warning displayed when a rendezvous descriptor exceeds
- the maximum size. Fixes bug 2750; bugfix on 0.2.1.5-alpha. Found by
- John Brooks.
- - Clients and hidden services now use HSDir-flagged relays for hidden
- service descriptor downloads and uploads even if the relays have no
- DirPort set and the client has disabled TunnelDirConns. This will
- eventually allow us to give the HSDir flag to relays with no
- DirPort. Fixes bug 2722; bugfix on 0.2.1.6-alpha.
- - Only limit the lengths of single HS descriptors, even when multiple
- HS descriptors are published to an HSDir relay in a single POST
- operation. Fixes bug 2948; bugfix on 0.2.1.5-alpha. Found by hsdir.
- o Minor bugfixes (controllers):
- - Allow GETINFO fingerprint to return a fingerprint even when
- we have not yet built a router descriptor. Fixes bug 3577;
- bugfix on 0.2.0.1-alpha.
- - Send a SUCCEEDED stream event to the controller when a reverse
- resolve succeeded. Fixes bug 3536; bugfix on 0.0.8pre1. Issue
- discovered by katmagic.
- - Remove a trailing asterisk from "exit-policy/default" in the
- output of the control port command "GETINFO info/names". Bugfix
- on 0.1.2.5-alpha.
- - Make the SIGNAL DUMP controller command work on FreeBSD. Fixes bug
- 2917. Bugfix on 0.1.1.1-alpha.
- - When we restart our relay, we might get a successful connection
- from the outside before we've started our reachability tests,
- triggering a warning: "ORPort found reachable, but I have no
- routerinfo yet. Failing to inform controller of success." This
- bug was harmless unless Tor is running under a controller
- like Vidalia, in which case the controller would never get a
- REACHABILITY_SUCCEEDED status event. Bugfix on 0.1.2.6-alpha;
- fixes bug 1172.
- - When a controller changes TrackHostExits, remove mappings for
- hosts that should no longer have their exits tracked. Bugfix on
- 0.1.0.1-rc.
- - When a controller changes VirtualAddrNetwork, remove any mappings
- for hosts that were automapped to the old network. Bugfix on
- 0.1.1.19-rc.
- - When a controller changes one of the AutomapHosts* options, remove
- any mappings for hosts that should no longer be automapped. Bugfix
- on 0.2.0.1-alpha.
- - Fix an off-by-one error in calculating some controller command
- argument lengths. Fortunately, this mistake is harmless since
- the controller code does redundant NUL termination too. Found by
- boboper. Bugfix on 0.1.1.1-alpha.
- - Fix a bug in the controller interface where "GETINFO ns/asdaskljkl"
- would return "551 Internal error" rather than "552 Unrecognized key
- ns/asdaskljkl". Bugfix on 0.1.2.3-alpha.
- - Don't spam the controller with events when we have no file
- descriptors available. Bugfix on 0.2.1.5-alpha. (Rate-limiting
- for log messages was already solved from bug 748.)
- - Emit a GUARD DROPPED controller event for a case we missed.
- - Ensure DNS requests launched by "RESOLVE" commands from the
- controller respect the __LeaveStreamsUnattached setconf options. The
- same goes for requests launched via DNSPort or transparent
- proxying. Bugfix on 0.2.0.1-alpha; fixes bug 1525.
- o Minor bugfixes (config options):
- - Tor used to limit HttpProxyAuthenticator values to 48 characters.
- Change the limit to 512 characters by removing base64 newlines.
- Fixes bug 2752. Fix by Michael Yakubovich.
- - Complain if PublishServerDescriptor is given multiple arguments that
- include 0 or 1. This configuration will be rejected in the future.
- Bugfix on 0.2.0.1-alpha; closes bug 1107.
- - Disallow BridgeRelay 1 and ORPort 0 at once in the configuration.
- Bugfix on 0.2.0.13-alpha; closes bug 928.
- o Minor bugfixes (log subsystem fixes):
- - When unable to format an address as a string, report its value
- as "???" rather than reusing the last formatted address. Bugfix
- on 0.2.1.5-alpha.
- - Be more consistent in our treatment of file system paths. "~" should
- get expanded to the user's home directory in the Log config option.
- Fixes bug 2971; bugfix on 0.2.0.1-alpha, which introduced the
- feature for the -f and --DataDirectory options.
- o Minor bugfixes (memory management):
- - Don't stack-allocate the list of supplementary GIDs when we're
- about to log them. Stack-allocating NGROUPS_MAX gid_t elements
- could take up to 256K, which is way too much stack. Found by
- Coverity; CID #450. Bugfix on 0.2.1.7-alpha.
- - Save a couple bytes in memory allocation every time we escape
- certain characters in a string. Patch from Florian Zumbiehl.
- o Minor bugfixes (protocol correctness):
- - When checking for 1024-bit keys, check for 1024 bits, not 128
- bytes. This allows Tor to correctly discard keys of length 1017
- through 1023. Bugfix on 0.0.9pre5.
- - Require that introduction point keys and onion handshake keys
- have a public exponent of 65537. Starts to fix bug 3207; bugfix
- on 0.2.0.10-alpha.
- - Handle SOCKS messages longer than 128 bytes long correctly, rather
- than waiting forever for them to finish. Fixes bug 2330; bugfix
- on 0.2.0.16-alpha. Found by doorss.
- - Never relay a cell for a circuit we have already destroyed.
- Between marking a circuit as closeable and finally closing it,
- it may have been possible for a few queued cells to get relayed,
- even though they would have been immediately dropped by the next
- OR in the circuit. Fixes bug 1184; bugfix on 0.2.0.1-alpha.
- - Never queue a cell for a circuit that's already been marked
- for close.
- - Fix a spec conformance issue: the network-status-version token
- must be the first token in a v3 consensus or vote. Discovered by
- "parakeep". Bugfix on 0.2.0.3-alpha.
- - A networkstatus vote must contain exactly one signature. Spec
- conformance issue. Bugfix on 0.2.0.3-alpha.
- - When asked about a DNS record type we don't support via a
- client DNSPort, reply with NOTIMPL rather than an empty
- reply. Patch by intrigeri. Fixes bug 3369; bugfix on 2.0.1-alpha.
- - Make more fields in the controller protocol case-insensitive, since
- control-spec.txt said they were.
- o Minor bugfixes (log messages):
- - Fix a log message that said "bits" while displaying a value in
- bytes. Found by wanoskarnet. Fixes bug 3318; bugfix on
- 0.2.0.1-alpha.
- - Downgrade "no current certificates known for authority" message from
- Notice to Info. Fixes bug 2899; bugfix on 0.2.0.10-alpha.
- - Correctly describe errors that occur when generating a TLS object.
- Previously we would attribute them to a failure while generating a
- TLS context. Patch by Robert Ransom. Bugfix on 0.1.0.4-rc; fixes
- bug 1994.
- - Fix an instance where a Tor directory mirror might accidentally
- log the IP address of a misbehaving Tor client. Bugfix on
- 0.1.0.1-rc.
- - Stop logging at severity 'warn' when some other Tor client tries
- to establish a circuit with us using weak DH keys. It's a protocol
- violation, but that doesn't mean ordinary users need to hear about
- it. Fixes the bug part of bug 1114. Bugfix on 0.1.0.13.
- - If your relay can't keep up with the number of incoming create
- cells, it would log one warning per failure into your logs. Limit
- warnings to 1 per minute. Bugfix on 0.0.2pre10; fixes bug 1042.
- o Minor bugfixes (build fixes):
- - Fix warnings from GCC 4.6's "-Wunused-but-set-variable" option.
- - When warning about missing zlib development packages during compile,
- give the correct package names. Bugfix on 0.2.0.1-alpha.
- - Fix warnings that newer versions of autoconf produce during
- ./autogen.sh. These warnings appear to be harmless in our case,
- but they were extremely verbose. Fixes bug 2020.
- - Squash a compile warning on OpenBSD. Reported by Tas; fixes
- bug 1848.
- o Minor bugfixes (portability):
- - Write several files in text mode, on OSes that distinguish text
- mode from binary mode (namely, Windows). These files are:
- 'buffer-stats', 'dirreq-stats', and 'entry-stats' on relays
- that collect those statistics; 'client_keys' and 'hostname' for
- hidden services that use authentication; and (in the tor-gencert
- utility) newly generated identity and signing keys. Previously,
- we wouldn't specify text mode or binary mode, leading to an
- assertion failure. Fixes bug 3607. Bugfix on 0.2.1.1-alpha (when
- the DirRecordUsageByCountry option which would have triggered
- the assertion failure was added), although this assertion failure
- would have occurred in tor-gencert on Windows in 0.2.0.1-alpha.
- - Selectively disable deprecation warnings on OS X because Lion
- started deprecating the shipped copy of openssl. Fixes bug 3643.
- - Use a wide type to hold sockets when built for 64-bit Windows.
- Fixes bug 3270.
- - Fix an issue that prevented static linking of libevent on
- some platforms (notably Linux). Fixes bug 2698; bugfix on 0.2.1.23,
- where we introduced the "--with-static-libevent" configure option.
- - Fix a bug with our locking implementation on Windows that couldn't
- correctly detect when a file was already locked. Fixes bug 2504,
- bugfix on 0.2.1.6-alpha.
- - Build correctly on OSX with zlib 1.2.4 and higher with all warnings
- enabled.
- - Fix IPv6-related connect() failures on some platforms (BSD, OS X).
- Bugfix on 0.2.0.3-alpha; fixes first part of bug 2660. Patch by
- "piebeer".
- o Minor bugfixes (code correctness):
- - Always NUL-terminate the sun_path field of a sockaddr_un before
- passing it to the kernel. (Not a security issue: kernels are
- smart enough to reject bad sockaddr_uns.) Found by Coverity;
- CID #428. Bugfix on Tor 0.2.0.3-alpha.
- - Make connection_printf_to_buf()'s behavior sane. Its callers
- expect it to emit a CRLF iff the format string ends with CRLF;
- it actually emitted a CRLF iff (a) the format string ended with
- CRLF or (b) the resulting string was over 1023 characters long or
- (c) the format string did not end with CRLF *and* the resulting
- string was 1021 characters long or longer. Bugfix on 0.1.1.9-alpha;
- fixes part of bug 3407.
- - Make send_control_event_impl()'s behavior sane. Its callers
- expect it to always emit a CRLF at the end of the string; it
- might have emitted extra control characters as well. Bugfix on
- 0.1.1.9-alpha; fixes another part of bug 3407.
- - Make crypto_rand_int() check the value of its input correctly.
- Previously, it accepted values up to UINT_MAX, but could return a
- negative number if given a value above INT_MAX+1. Found by George
- Kadianakis. Fixes bug 3306; bugfix on 0.2.2pre14.
- - Fix a potential null-pointer dereference while computing a
- consensus. Bugfix on 0.2.0.3-alpha, found with the help of
- clang's analyzer.
- - If we fail to compute the identity digest of a v3 legacy keypair,
- warn, and don't use a buffer-full of junk instead. Bugfix on
- 0.2.1.1-alpha; fixes bug 3106.
- - Resolve an untriggerable issue in smartlist_string_num_isin(),
- where if the function had ever in the future been used to check
- for the presence of a too-large number, it would have given an
- incorrect result. (Fortunately, we only used it for 16-bit
- values.) Fixes bug 3175; bugfix on 0.1.0.1-rc.
- - Be more careful about reporting the correct error from a failed
- connect() system call. Under some circumstances, it was possible to
- look at an incorrect value for errno when sending the end reason.
- Bugfix on 0.1.0.1-rc.
- - Correctly handle an "impossible" overflow cases in connection byte
- counting, where we write or read more than 4GB on an edge connection
- in a single second. Bugfix on 0.1.2.8-beta.
- - Avoid a double mark-for-free warning when failing to attach a
- transparent proxy connection. Bugfix on 0.1.2.1-alpha. Fixes
- bug 2279.
- - Correctly detect failure to allocate an OpenSSL BIO. Fixes bug 2378;
- found by "cypherpunks". This bug was introduced before the first
- Tor release, in svn commit r110.
- - Fix a bug in bandwidth history state parsing that could have been
- triggered if a future version of Tor ever changed the timing
- granularity at which bandwidth history is measured. Bugfix on
- Tor 0.1.1.11-alpha.
- - Add assertions to check for overflow in arguments to
- base32_encode() and base32_decode(); fix a signed-unsigned
- comparison there too. These bugs are not actually reachable in Tor,
- but it's good to prevent future errors too. Found by doorss.
- - Avoid a bogus overlapped memcpy in tor_addr_copy(). Reported by
- "memcpyfail".
- - Set target port in get_interface_address6() correctly. Bugfix
- on 0.1.1.4-alpha and 0.2.0.3-alpha; fixes second part of bug 2660.
- - Fix an impossible-to-actually-trigger buffer overflow in relay
- descriptor generation. Bugfix on 0.1.0.15.
- - Fix numerous small code-flaws found by Coverity Scan Rung 3.
- o Minor bugfixes (code improvements):
- - After we free an internal connection structure, overwrite it
- with a different memory value than we use for overwriting a freed
- internal circuit structure. Should help with debugging. Suggested
- by bug 1055.
- - If OpenSSL fails to make a duplicate of a private or public key, log
- an error message and try to exit cleanly. May help with debugging
- if bug 1209 ever remanifests.
- - Some options used different conventions for uppercasing of acronyms
- when comparing manpage and source. Fix those in favor of the
- manpage, as it makes sense to capitalize acronyms.
- - Take a first step towards making or.h smaller by splitting out
- function definitions for all source files in src/or/. Leave
- structures and defines in or.h for now.
- - Remove a few dead assignments during router parsing. Found by
- coverity.
- - Don't use 1-bit wide signed bit fields. Found by coverity.
- - Avoid signed/unsigned comparisons by making SIZE_T_CEILING unsigned.
- None of the cases where we did this before were wrong, but by making
- this change we avoid warnings. Fixes bug 2475; bugfix on 0.2.1.28.
- - The memarea code now uses a sentinel value at the end of each area
- to make sure nothing writes beyond the end of an area. This might
- help debug some conceivable causes of bug 930.
- - Always treat failure to allocate an RSA key as an unrecoverable
- allocation error.
- - Add some more defensive programming for architectures that can't
- handle unaligned integer accesses. We don't know of any actual bugs
- right now, but that's the best time to fix them. Fixes bug 1943.
- o Minor bugfixes (misc):
- - Fix a rare bug in rend_fn unit tests: we would fail a test when
- a randomly generated port is 0. Diagnosed by Matt Edman. Bugfix
- on 0.2.0.10-alpha; fixes bug 1808.
- - Where available, use Libevent 2.0's periodic timers so that our
- once-per-second cleanup code gets called even more closely to
- once per second than it would otherwise. Fixes bug 943.
- - Ignore OutboundBindAddress when connecting to localhost.
- Connections to localhost need to come _from_ localhost, or else
- local servers (like DNS and outgoing HTTP/SOCKS proxies) will often
- refuse to listen.
- - Update our OpenSSL 0.9.8l fix so that it works with OpenSSL 0.9.8m
- too.
- - If any of the v3 certs we download are unparseable, we should
- actually notice the failure so we don't retry indefinitely. Bugfix
- on 0.2.0.x; reported by "rotator".
- - When Tor fails to parse a descriptor of any kind, dump it to disk.
- Might help diagnosing bug 1051.
- - Make our 'torify' script more portable; if we have only one of
- 'torsocks' or 'tsocks' installed, don't complain to the user;
- and explain our warning about tsocks better.
- - Fix some urls in the exit notice file and make it XHTML1.1 strict
- compliant. Based on a patch from Christian Kujau.
- o Documentation changes:
- - Modernize the doxygen configuration file slightly. Fixes bug 2707.
- - Resolve all doxygen warnings except those for missing documentation.
- Fixes bug 2705.
- - Add doxygen documentation for more functions, fields, and types.
- - Convert the HACKING file to asciidoc, and add a few new sections
- to it, explaining how we use Git, how we make changelogs, and
- what should go in a patch.
- - Document the default socks host and port (127.0.0.1:9050) for
- tor-resolve.
- - Removed some unnecessary files from the source distribution. The
- AUTHORS file has now been merged into the people page on the
- website. The roadmaps and design doc can now be found in the
- projects directory in svn.
- o Deprecated and removed features (config):
- - Remove the torrc.complete file. It hasn't been kept up to date
- and users will have better luck checking out the manpage.
- - Remove the HSAuthorityRecordStats option that version 0 hidden
- service authorities could use to track statistics of overall v0
- hidden service usage.
- - Remove the obsolete "NoPublish" option; it has been flagged
- as obsolete and has produced a warning since 0.1.1.18-rc.
- - Caches no longer download and serve v2 networkstatus documents
- unless FetchV2Networkstatus flag is set: these documents haven't
- haven't been used by clients or relays since 0.2.0.x. Resolves
- bug 3022.
- o Deprecated and removed features (controller):
- - The controller no longer accepts the old obsolete "addr-mappings/"
- or "unregistered-servers-" GETINFO values.
- - The EXTENDED_EVENTS and VERBOSE_NAMES controller features are now
- always on; using them is necessary for correct forward-compatible
- controllers.
- o Deprecated and removed features (misc):
- - Hidden services no longer publish version 0 descriptors, and clients
- do not request or use version 0 descriptors. However, the old hidden
- service authorities still accept and serve version 0 descriptors
- when contacted by older hidden services/clients.
- - Remove undocumented option "-F" from tor-resolve: it hasn't done
- anything since 0.2.1.16-rc.
- - Remove everything related to building the expert bundle for OS X.
- It has confused many users, doesn't work right on OS X 10.6,
- and is hard to get rid of once installed. Resolves bug 1274.
- - Remove support for .noconnect style addresses. Nobody was using
- them, and they provided another avenue for detecting Tor users
- via application-level web tricks.
- - When we fixed bug 1038 we had to put in a restriction not to send
- RELAY_EARLY cells on rend circuits. This was necessary as long
- as relays using Tor 0.2.1.3-alpha through 0.2.1.18-alpha were
- active. Now remove this obsolete check. Resolves bug 2081.
- - Remove workaround code to handle directory responses from servers
- that had bug 539 (they would send HTTP status 503 responses _and_
- send a body too). Since only server versions before
- 0.2.0.16-alpha/0.1.2.19 were affected, there is no longer reason to
- keep the workaround in place.
- - Remove the old 'fuzzy time' logic. It was supposed to be used for
- handling calculations where we have a known amount of clock skew and
- an allowed amount of unknown skew. But we only used it in three
- places, and we never adjusted the known/unknown skew values. This is
- still something we might want to do someday, but if we do, we'll
- want to do it differently.
- - Remove the "--enable-iphone" option to ./configure. According to
- reports from Marco Bonetti, Tor builds fine without any special
- tweaking on recent iPhone SDK versions.
- Changes in version 0.2.1.30 - 2011-02-23
- Tor 0.2.1.30 fixes a variety of less critical bugs. The main other
- change is a slight tweak to Tor's TLS handshake that makes relays
- and bridges that run this new version reachable from Iran again.
- We don't expect this tweak will win the arms race long-term, but it
- buys us time until we roll out a better solution.
- o Major bugfixes:
- - Stop sending a CLOCK_SKEW controller status event whenever
- we fetch directory information from a relay that has a wrong clock.
- Instead, only inform the controller when it's a trusted authority
- that claims our clock is wrong. Bugfix on 0.1.2.6-alpha; fixes
- the rest of bug 1074.
- - Fix a bounds-checking error that could allow an attacker to
- remotely crash a directory authority. Bugfix on 0.2.1.5-alpha.
- Found by "piebeer".
- - If relays set RelayBandwidthBurst but not RelayBandwidthRate,
- Tor would ignore their RelayBandwidthBurst setting,
- potentially using more bandwidth than expected. Bugfix on
- 0.2.0.1-alpha. Reported by Paul Wouters. Fixes bug 2470.
- - Ignore and warn if the user mistakenly sets "PublishServerDescriptor
- hidserv" in her torrc. The 'hidserv' argument never controlled
- publication of hidden service descriptors. Bugfix on 0.2.0.1-alpha.
- o Minor features:
- - Adjust our TLS Diffie-Hellman parameters to match those used by
- Apache's mod_ssl.
- - Update to the February 1 2011 Maxmind GeoLite Country database.
- o Minor bugfixes:
- - Check for and reject overly long directory certificates and
- directory tokens before they have a chance to hit any assertions.
- Bugfix on 0.2.1.28. Found by "doorss".
- - Bring the logic that gathers routerinfos and assesses the
- acceptability of circuits into line. This prevents a Tor OP from
- getting locked in a cycle of choosing its local OR as an exit for a
- path (due to a .exit request) and then rejecting the circuit because
- its OR is not listed yet. It also prevents Tor clients from using an
- OR running in the same instance as an exit (due to a .exit request)
- if the OR does not meet the same requirements expected of an OR
- running elsewhere. Fixes bug 1859; bugfix on 0.1.0.1-rc.
- o Packaging changes:
- - Stop shipping the Tor specs files and development proposal documents
- in the tarball. They are now in a separate git repository at
- git://git.torproject.org/torspec.git
- - Do not include Git version tags as though they are SVN tags when
- generating a tarball from inside a repository that has switched
- between branches. Bugfix on 0.2.1.15-rc; fixes bug 2402.
- Changes in version 0.2.1.29 - 2011-01-15
- Tor 0.2.1.29 continues our recent code security audit work. The main
- fix resolves a remote heap overflow vulnerability that can allow remote
- code execution. Other fixes address a variety of assert and crash bugs,
- most of which we think are hard to exploit remotely.
- o Major bugfixes (security):
- - Fix a heap overflow bug where an adversary could cause heap
- corruption. This bug probably allows remote code execution
- attacks. Reported by "debuger". Fixes CVE-2011-0427. Bugfix on
- 0.1.2.10-rc.
- - Prevent a denial-of-service attack by disallowing any
- zlib-compressed data whose compression factor is implausibly
- high. Fixes part of bug 2324; reported by "doorss".
- - Zero out a few more keys in memory before freeing them. Fixes
- bug 2384 and part of bug 2385. These key instances found by
- "cypherpunks", based on Andrew Case's report about being able
- to find sensitive data in Tor's memory space if you have enough
- permissions. Bugfix on 0.0.2pre9.
- o Major bugfixes (crashes):
- - Prevent calls to Libevent from inside Libevent log handlers.
- This had potential to cause a nasty set of crashes, especially
- if running Libevent with debug logging enabled, and running
- Tor with a controller watching for low-severity log messages.
- Bugfix on 0.1.0.2-rc. Fixes bug 2190.
- - Add a check for SIZE_T_MAX to tor_realloc() to try to avoid
- underflow errors there too. Fixes the other part of bug 2324.
- - Fix a bug where we would assert if we ever had a
- cached-descriptors.new file (or another file read directly into
- memory) of exactly SIZE_T_CEILING bytes. Fixes bug 2326; bugfix
- on 0.2.1.25. Found by doorss.
- - Fix some potential asserts and parsing issues with grossly
- malformed router caches. Fixes bug 2352; bugfix on Tor 0.2.1.27.
- Found by doorss.
- o Minor bugfixes (other):
- - Fix a bug with handling misformed replies to reverse DNS lookup
- requests in DNSPort. Bugfix on Tor 0.2.0.1-alpha. Related to a
- bug reported by doorss.
- - Fix compilation on mingw when a pthreads compatibility library
- has been installed. (We don't want to use it, so we shouldn't
- be including pthread.h.) Fixes bug 2313; bugfix on 0.1.0.1-rc.
- - Fix a bug where we would declare that we had run out of virtual
- addresses when the address space was only half-exhausted. Bugfix
- on 0.1.2.1-alpha.
- - Correctly handle the case where AutomapHostsOnResolve is set but
- no virtual addresses are available. Fixes bug 2328; bugfix on
- 0.1.2.1-alpha. Bug found by doorss.
- - Correctly handle wrapping around when we run out of virtual
- address space. Found by cypherpunks; bugfix on 0.2.0.5-alpha.
- o Minor features:
- - Update to the January 1 2011 Maxmind GeoLite Country database.
- - Introduce output size checks on all of our decryption functions.
- o Build changes:
- - Tor does not build packages correctly with Automake 1.6 and earlier;
- added a check to Makefile.am to make sure that we're building with
- Automake 1.7 or later.
- - The 0.2.1.28 tarball was missing src/common/OpenBSD_malloc_Linux.c
- because we built it with a too-old version of automake. Thus that
- release broke ./configure --enable-openbsd-malloc, which is popular
- among really fast exit relays on Linux.
- Changes in version 0.2.1.28 - 2010-12-17
- Tor 0.2.1.28 does some code cleanup to reduce the risk of remotely
- exploitable bugs. We also took this opportunity to change the IP address
- for one of our directory authorities, and to update the geoip database
- we ship.
- o Major bugfixes:
- - Fix a remotely exploitable bug that could be used to crash instances
- of Tor remotely by overflowing on the heap. Remote-code execution
- hasn't been confirmed, but can't be ruled out. Everyone should
- upgrade. Bugfix on the 0.1.1 series and later.
- o Directory authority changes:
- - Change IP address and ports for gabelmoo (v3 directory authority).
- o Minor features:
- - Update to the December 1 2010 Maxmind GeoLite Country database.
- Changes in version 0.2.1.27 - 2010-11-23
- Yet another OpenSSL security patch broke its compatibility with Tor:
- Tor 0.2.1.27 makes relays work with openssl 0.9.8p and 1.0.0.b. We
- also took this opportunity to fix several crash bugs, integrate a new
- directory authority, and update the bundled GeoIP database.
- o Major bugfixes:
- - Resolve an incompatibility with OpenSSL 0.9.8p and OpenSSL 1.0.0b:
- No longer set the tlsext_host_name extension on server SSL objects;
- but continue to set it on client SSL objects. Our goal in setting
- it was to imitate a browser, not a vhosting server. Fixes bug 2204;
- bugfix on 0.2.1.1-alpha.
- - Do not log messages to the controller while shrinking buffer
- freelists. Doing so would sometimes make the controller connection
- try to allocate a buffer chunk, which would mess up the internals
- of the freelist and cause an assertion failure. Fixes bug 1125;
- fixed by Robert Ransom. Bugfix on 0.2.0.16-alpha.
- - Learn our external IP address when we're a relay or bridge, even if
- we set PublishServerDescriptor to 0. Bugfix on 0.2.0.3-alpha,
- where we introduced bridge relays that don't need to publish to
- be useful. Fixes bug 2050.
- - Do even more to reject (and not just ignore) annotations on
- router descriptors received anywhere but from the cache. Previously
- we would ignore such annotations at first, but cache them to disk
- anyway. Bugfix on 0.2.0.8-alpha. Found by piebeer.
- - When you're using bridges and your network goes away and your
- bridges get marked as down, recover when you attempt a new socks
- connection (if the network is back), rather than waiting up to an
- hour to try fetching new descriptors for your bridges. Bugfix on
- 0.2.0.3-alpha; fixes bug 1981.
- o Major features:
- - Move to the November 2010 Maxmind GeoLite country db (rather
- than the June 2009 ip-to-country GeoIP db) for our statistics that
- count how many users relays are seeing from each country. Now we'll
- have more accurate data, especially for many African countries.
- o New directory authorities:
- - Set up maatuska (run by Linus Nordberg) as the eighth v3 directory
- authority.
- o Minor bugfixes:
- - Fix an assertion failure that could occur in directory caches or
- bridge users when using a very short voting interval on a testing
- network. Diagnosed by Robert Hogan. Fixes bug 1141; bugfix on
- 0.2.0.8-alpha.
- - Enforce multiplicity rules when parsing annotations. Bugfix on
- 0.2.0.8-alpha. Found by piebeer.
- - Allow handshaking OR connections to take a full KeepalivePeriod
- seconds to handshake. Previously, we would close them after
- IDLE_OR_CONN_TIMEOUT (180) seconds, the same timeout as if they
- were open. Bugfix on 0.2.1.26; fixes bug 1840. Thanks to mingw-san
- for analysis help.
- - When building with --enable-gcc-warnings on OpenBSD, disable
- warnings in system headers. This makes --enable-gcc-warnings
- pass on OpenBSD 4.8.
- o Minor features:
- - Exit nodes didn't recognize EHOSTUNREACH as a plausible error code,
- and so sent back END_STREAM_REASON_MISC. Clients now recognize a new
- stream ending reason for this case: END_STREAM_REASON_NOROUTE.
- Servers can start sending this code when enough clients recognize
- it. Bugfix on 0.1.0.1-rc; fixes part of bug 1793.
- - Build correctly on mingw with more recent versions of OpenSSL 0.9.8.
- Patch from mingw-san.
- o Removed files:
- - Remove the old debian/ directory from the main Tor distribution.
- The official Tor-for-debian git repository lives at the URL
- https://git.torproject.org/debian/tor.git
- - Stop shipping the old doc/website/ directory in the tarball. We
- changed the website format in late 2010, and what we shipped in
- 0.2.1.26 really wasn't that useful anyway.
- Changes in version 0.2.1.26 - 2010-05-02
- Tor 0.2.1.26 addresses the recent connection and memory overload
- problems we've been seeing on relays, especially relays with their
- DirPort open. If your relay has been crashing, or you turned it off
- because it used too many resources, give this release a try.
- This release also fixes yet another instance of broken OpenSSL libraries
- that was causing some relays to drop out of the consensus.
- o Major bugfixes:
- - Teach relays to defend themselves from connection overload. Relays
- now close idle circuits early if it looks like they were intended
- for directory fetches. Relays are also more aggressive about closing
- TLS connections that have no circuits on them. Such circuits are
- unlikely to be re-used, and tens of thousands of them were piling
- up at the fast relays, causing the relays to run out of sockets
- and memory. Bugfix on 0.2.0.22-rc (where clients started tunneling
- their directory fetches over TLS).
- - Fix SSL renegotiation behavior on OpenSSL versions like on Centos
- that claim to be earlier than 0.9.8m, but which have in reality
- backported huge swaths of 0.9.8m or 0.9.8n renegotiation
- behavior. Possible fix for some cases of bug 1346.
- - Directory mirrors were fetching relay descriptors only from v2
- directory authorities, rather than v3 authorities like they should.
- Only 2 v2 authorities remain (compared to 7 v3 authorities), leading
- to a serious bottleneck. Bugfix on 0.2.0.9-alpha. Fixes bug 1324.
- o Minor bugfixes:
- - Finally get rid of the deprecated and now harmful notion of "clique
- mode", where directory authorities maintain TLS connections to
- every other relay.
- o Testsuite fixes:
- - In the util/threads test, no longer free the test_mutex before all
- worker threads have finished. Bugfix on 0.2.1.6-alpha.
- - The master thread could starve the worker threads quite badly on
- certain systems, causing them to run only partially in the allowed
- window. This resulted in test failures. Now the master thread sleeps
- occasionally for a few microseconds while the two worker-threads
- compete for the mutex. Bugfix on 0.2.0.1-alpha.
- Changes in version 0.2.1.25 - 2010-03-16
- Tor 0.2.1.25 fixes a regression introduced in 0.2.1.23 that could
- prevent relays from guessing their IP address correctly. It also fixes
- several minor potential security bugs.
- o Major bugfixes:
- - Fix a regression from our patch for bug 1244 that caused relays
- to guess their IP address incorrectly if they didn't set Address
- in their torrc and/or their address fails to resolve. Bugfix on
- 0.2.1.23; fixes bug 1269.
- - When freeing a session key, zero it out completely. We only zeroed
- the first ptrsize bytes. Bugfix on 0.0.2pre8. Discovered and
- patched by ekir. Fixes bug 1254.
- o Minor bugfixes:
- - Fix a dereference-then-NULL-check sequence when publishing
- descriptors. Bugfix on 0.2.1.5-alpha. Discovered by ekir; fixes
- bug 1255.
- - Fix another dereference-then-NULL-check sequence. Bugfix on
- 0.2.1.14-rc. Discovered by ekir; fixes bug 1256.
- - Make sure we treat potentially not NUL-terminated strings correctly.
- Bugfix on 0.1.1.13-alpha. Discovered by rieo; fixes bug 1257.
- Changes in version 0.2.1.24 - 2010-02-21
- Tor 0.2.1.24 makes Tor work again on the latest OS X -- this time
- for sure!
- o Minor bugfixes:
- - Work correctly out-of-the-box with even more vendor-patched versions
- of OpenSSL. In particular, make it so Debian and OS X don't need
- customized patches to run/build.
- Changes in version 0.2.1.23 - 2010-02-13
- Tor 0.2.1.23 fixes a huge client-side performance bug, makes Tor work
- again on the latest OS X, and updates the location of a directory
- authority.
- o Major bugfixes (performance):
- - We were selecting our guards uniformly at random, and then weighting
- which of our guards we'd use uniformly at random. This imbalance
- meant that Tor clients were severely limited on throughput (and
- probably latency too) by the first hop in their circuit. Now we
- select guards weighted by currently advertised bandwidth. We also
- automatically discard guards picked using the old algorithm. Fixes
- bug 1217; bugfix on 0.2.1.3-alpha. Found by Mike Perry.
- o Major bugfixes:
- - Make Tor work again on the latest OS X: when deciding whether to
- use strange flags to turn TLS renegotiation on, detect the OpenSSL
- version at run-time, not compile time. We need to do this because
- Apple doesn't update its dev-tools headers when it updates its
- libraries in a security patch.
- - Fix a potential buffer overflow in lookup_last_hid_serv_request()
- that could happen on 32-bit platforms with 64-bit time_t. Also fix
- a memory leak when requesting a hidden service descriptor we've
- requested before. Fixes bug 1242, bugfix on 0.2.0.18-alpha. Found
- by aakova.
- o Minor bugfixes:
- - Refactor resolve_my_address() to not use gethostbyname() anymore.
- Fixes bug 1244; bugfix on 0.0.2pre25. Reported by Mike Mestnik.
- o Minor features:
- - Avoid a mad rush at the beginning of each month when each client
- rotates half of its guards. Instead we spread the rotation out
- throughout the month, but we still avoid leaving a precise timestamp
- in the state file about when we first picked the guard. Improves
- over the behavior introduced in 0.1.2.17.
- Changes in version 0.2.1.22 - 2010-01-19
- Tor 0.2.1.22 fixes a critical privacy problem in bridge directory
- authorities -- it would tell you its whole history of bridge descriptors
- if you make the right directory request. This stable update also
- rotates two of the seven v3 directory authority keys and locations.
- o Directory authority changes:
- - Rotate keys (both v3 identity and relay identity) for moria1
- and gabelmoo.
- o Major bugfixes:
- - Stop bridge directory authorities from answering dbg-stability.txt
- directory queries, which would let people fetch a list of all
- bridge identities they track. Bugfix on 0.2.1.6-alpha.
- Changes in version 0.2.1.21 - 2009-12-21
- Tor 0.2.1.21 fixes an incompatibility with the most recent OpenSSL
- library. If you use Tor on Linux / Unix and you're getting SSL
- renegotiation errors, upgrading should help. We also recommend an
- upgrade if you're an exit relay.
- o Major bugfixes:
- - Work around a security feature in OpenSSL 0.9.8l that prevents our
- handshake from working unless we explicitly tell OpenSSL that we
- are using SSL renegotiation safely. We are, of course, but OpenSSL
- 0.9.8l won't work unless we say we are.
- - Avoid crashing if the client is trying to upload many bytes and the
- circuit gets torn down at the same time, or if the flip side
- happens on the exit relay. Bugfix on 0.2.0.1-alpha; fixes bug 1150.
- o Minor bugfixes:
- - Do not refuse to learn about authority certs and v2 networkstatus
- documents that are older than the latest consensus. This bug might
- have degraded client bootstrapping. Bugfix on 0.2.0.10-alpha.
- Spotted and fixed by xmux.
- - Fix a couple of very-hard-to-trigger memory leaks, and one hard-to-
- trigger platform-specific option misparsing case found by Coverity
- Scan.
- - Fix a compilation warning on Fedora 12 by removing an impossible-to-
- trigger assert. Fixes bug 1173.
- Changes in version 0.2.1.20 - 2009-10-15
- Tor 0.2.1.20 fixes a crash bug when you're accessing many hidden
- services at once, prepares for more performance improvements, and
- fixes a bunch of smaller bugs.
- The Windows and OS X bundles also include a more recent Vidalia,
- and switch from Privoxy to Polipo.
- The OS X installers are now drag and drop. It's best to un-install
- Tor/Vidalia and then install this new bundle, rather than upgrade. If
- you want to upgrade, you'll need to update the paths for Tor and Polipo
- in the Vidalia Settings window.
- o Major bugfixes:
- - Send circuit or stream sendme cells when our window has decreased
- by 100 cells, not when it has decreased by 101 cells. Bug uncovered
- by Karsten when testing the "reduce circuit window" performance
- patch. Bugfix on the 54th commit on Tor -- from July 2002,
- before the release of Tor 0.0.0. This is the new winner of the
- oldest-bug prize.
- - Fix a remotely triggerable memory leak when a consensus document
- contains more than one signature from the same voter. Bugfix on
- 0.2.0.3-alpha.
- - Avoid segfault in rare cases when finishing an introduction circuit
- as a client and finding out that we don't have an introduction key
- for it. Fixes bug 1073. Reported by Aaron Swartz.
- o Major features:
- - Tor now reads the "circwindow" parameter out of the consensus,
- and uses that value for its circuit package window rather than the
- default of 1000 cells. Begins the implementation of proposal 168.
- o New directory authorities:
- - Set up urras (run by Jacob Appelbaum) as the seventh v3 directory
- authority.
- - Move moria1 and tonga to alternate IP addresses.
- o Minor bugfixes:
- - Fix a signed/unsigned compile warning in 0.2.1.19.
- - Fix possible segmentation fault on directory authorities. Bugfix on
- 0.2.1.14-rc.
- - Fix an extremely rare infinite recursion bug that could occur if
- we tried to log a message after shutting down the log subsystem.
- Found by Matt Edman. Bugfix on 0.2.0.16-alpha.
- - Fix an obscure bug where hidden services on 64-bit big-endian
- systems might mis-read the timestamp in v3 introduce cells, and
- refuse to connect back to the client. Discovered by "rotor".
- Bugfix on 0.2.1.6-alpha.
- - We were triggering a CLOCK_SKEW controller status event whenever
- we connect via the v2 connection protocol to any relay that has
- a wrong clock. Instead, we should only inform the controller when
- it's a trusted authority that claims our clock is wrong. Bugfix
- on 0.2.0.20-rc; starts to fix bug 1074. Reported by SwissTorExit.
- - We were telling the controller about CHECKING_REACHABILITY and
- REACHABILITY_FAILED status events whenever we launch a testing
- circuit or notice that one has failed. Instead, only tell the
- controller when we want to inform the user of overall success or
- overall failure. Bugfix on 0.1.2.6-alpha. Fixes bug 1075. Reported
- by SwissTorExit.
- - Don't warn when we're using a circuit that ends with a node
- excluded in ExcludeExitNodes, but the circuit is not used to access
- the outside world. This should help fix bug 1090. Bugfix on
- 0.2.1.6-alpha.
- - Work around a small memory leak in some versions of OpenSSL that
- stopped the memory used by the hostname TLS extension from being
- freed.
- o Minor features:
- - Add a "getinfo status/accepted-server-descriptor" controller
- command, which is the recommended way for controllers to learn
- whether our server descriptor has been successfully received by at
- least on directory authority. Un-recommend good-server-descriptor
- getinfo and status events until we have a better design for them.
- Changes in version 0.2.1.19 - 2009-07-28
- Tor 0.2.1.19 fixes a major bug with accessing and providing hidden
- services.
- o Major bugfixes:
- - Make accessing hidden services on 0.2.1.x work right again.
- Bugfix on 0.2.1.3-alpha; workaround for bug 1038. Diagnosis and
- part of patch provided by "optimist".
- o Minor features:
- - When a relay/bridge is writing out its identity key fingerprint to
- the "fingerprint" file and to its logs, write it without spaces. Now
- it will look like the fingerprints in our bridges documentation,
- and confuse fewer users.
- o Minor bugfixes:
- - Relays no longer publish a new server descriptor if they change
- their MaxAdvertisedBandwidth config option but it doesn't end up
- changing their advertised bandwidth numbers. Bugfix on 0.2.0.28-rc;
- fixes bug 1026. Patch from Sebastian.
- - Avoid leaking memory every time we get a create cell but we have
- so many already queued that we refuse it. Bugfix on 0.2.0.19-alpha;
- fixes bug 1034. Reported by BarkerJr.
- Changes in version 0.2.1.18 - 2009-07-24
- Tor 0.2.1.18 lays the foundations for performance improvements,
- adds status events to help users diagnose bootstrap problems, adds
- optional authentication/authorization for hidden services, fixes a
- variety of potential anonymity problems, and includes a huge pile of
- other features and bug fixes.
- o Major features (clients):
- - Start sending "bootstrap phase" status events to the controller,
- so it can keep the user informed of progress fetching directory
- information and establishing circuits. Also inform the controller
- if we think we're stuck at a particular bootstrap phase. Implements
- proposal 137.
- - Clients replace entry guards that were chosen more than a few months
- ago. This change should significantly improve client performance,
- especially once more people upgrade, since relays that have been
- a guard for a long time are currently overloaded.
- - Network status consensus documents and votes now contain bandwidth
- information for each relay. Clients use the bandwidth values
- in the consensus, rather than the bandwidth values in each
- relay descriptor. This approach opens the door to more accurate
- bandwidth estimates once the directory authorities start doing
- active measurements. Implements part of proposal 141.
- o Major features (relays):
- - Disable and refactor some debugging checks that forced a linear scan
- over the whole server-side DNS cache. These accounted for over 50%
- of CPU time on a relatively busy exit node's gprof profile. Also,
- disable some debugging checks that appeared in exit node profile
- data. Found by Jacob.
- - New DirPortFrontPage option that takes an html file and publishes
- it as "/" on the DirPort. Now relay operators can provide a
- disclaimer without needing to set up a separate webserver. There's
- a sample disclaimer in contrib/tor-exit-notice.html.
- o Major features (hidden services):
- - Make it possible to build hidden services that only certain clients
- are allowed to connect to. This is enforced at several points,
- so that unauthorized clients are unable to send INTRODUCE cells
- to the service, or even (depending on the type of authentication)
- to learn introduction points. This feature raises the bar for
- certain kinds of active attacks against hidden services. Design
- and code by Karsten Loesing. Implements proposal 121.
- - Relays now store and serve v2 hidden service descriptors by default,
- i.e., the new default value for HidServDirectoryV2 is 1. This is
- the last step in proposal 114, which aims to make hidden service
- lookups more reliable.
- o Major features (path selection):
- - ExitNodes and Exclude*Nodes config options now allow you to restrict
- by country code ("{US}") or IP address or address pattern
- ("255.128.0.0/16"). Patch from Robert Hogan. It still needs some
- refinement to decide what config options should take priority if
- you ask to both use a particular node and exclude it.
- o Major features (misc):
- - When building a consensus, do not include routers that are down.
- This cuts down 30% to 40% on consensus size. Implements proposal
- 138.
- - New TestingTorNetwork config option to allow adjustment of
- previously constant values that could slow bootstrapping. Implements
- proposal 135. Patch from Karsten.
- - Convert many internal address representations to optionally hold
- IPv6 addresses. Generate and accept IPv6 addresses in many protocol
- elements. Make resolver code handle nameservers located at IPv6
- addresses.
- - More work on making our TLS handshake blend in: modify the list
- of ciphers advertised by OpenSSL in client mode to even more
- closely resemble a common web browser. We cheat a little so that
- we can advertise ciphers that the locally installed OpenSSL doesn't
- know about.
- - Use the TLS1 hostname extension to more closely resemble browser
- behavior.
- o Security fixes (anonymity/entropy):
- - Never use a connection with a mismatched address to extend a
- circuit, unless that connection is canonical. A canonical
- connection is one whose address is authenticated by the router's
- identity key, either in a NETINFO cell or in a router descriptor.
- - Implement most of proposal 110: The first K cells to be sent
- along a circuit are marked as special "early" cells; only K "early"
- cells will be allowed. Once this code is universal, we can block
- certain kinds of denial-of-service attack by requiring that EXTEND
- commands must be sent using an "early" cell.
- - Resume using OpenSSL's RAND_poll() for better (and more portable)
- cross-platform entropy collection again. We used to use it, then
- stopped using it because of a bug that could crash systems that
- called RAND_poll when they had a lot of fds open. It looks like the
- bug got fixed in late 2006. Our new behavior is to call RAND_poll()
- at startup, and to call RAND_poll() when we reseed later only if
- we have a non-buggy OpenSSL version.
- - When the client is choosing entry guards, now it selects at most
- one guard from a given relay family. Otherwise we could end up with
- all of our entry points into the network run by the same operator.
- Suggested by Camilo Viecco. Fix on 0.1.1.11-alpha.
- - Do not use or believe expired v3 authority certificates. Patch
- from Karsten. Bugfix in 0.2.0.x. Fixes bug 851.
- - Drop begin cells to a hidden service if they come from the middle
- of a circuit. Patch from lark.
- - When we erroneously receive two EXTEND cells for the same circuit
- ID on the same connection, drop the second. Patch from lark.
- - Authorities now vote for the Stable flag for any router whose
- weighted MTBF is at least 5 days, regardless of the mean MTBF.
- - Clients now never report any stream end reason except 'MISC'.
- Implements proposal 148.
- o Major bugfixes (crashes):
- - Parse dates and IPv4 addresses in a locale- and libc-independent
- manner, to avoid platform-dependent behavior on malformed input.
- - Fix a crash that occurs on exit nodes when a nameserver request
- timed out. Bugfix on 0.1.2.1-alpha; our CLEAR debugging code had
- been suppressing the bug since 0.1.2.10-alpha. Partial fix for
- bug 929.
- - Do not assume that a stack-allocated character array will be
- 64-bit aligned on platforms that demand that uint64_t access is
- aligned. Possible fix for bug 604.
- - Resolve a very rare crash bug that could occur when the user forced
- a nameserver reconfiguration during the middle of a nameserver
- probe. Fixes bug 526. Bugfix on 0.1.2.1-alpha.
- - Avoid a "0 divided by 0" calculation when calculating router uptime
- at directory authorities. Bugfix on 0.2.0.8-alpha.
- - Fix an assertion bug in parsing policy-related options; possible fix
- for bug 811.
- - Rate-limit too-many-sockets messages: when they happen, they happen
- a lot and end up filling up the disk. Resolves bug 748.
- - Fix a race condition that could cause crashes or memory corruption
- when running as a server with a controller listening for log
- messages.
- - Avoid crashing when we have a policy specified in a DirPolicy or
- SocksPolicy or ReachableAddresses option with ports set on it,
- and we re-load the policy. May fix bug 996.
- - Fix an assertion failure on 64-bit platforms when we allocated
- memory right up to the end of a memarea, then realigned the memory
- one step beyond the end. Fixes a possible cause of bug 930.
- - Protect the count of open sockets with a mutex, so we can't
- corrupt it when two threads are closing or opening sockets at once.
- Fix for bug 939. Bugfix on 0.2.0.1-alpha.
- o Major bugfixes (clients):
- - Discard router descriptors as we load them if they are more than
- five days old. Otherwise if Tor is off for a long time and then
- starts with cached descriptors, it will try to use the onion keys
- in those obsolete descriptors when building circuits. Fixes bug 887.
- - When we choose to abandon a new entry guard because we think our
- older ones might be better, close any circuits pending on that
- new entry guard connection. This fix should make us recover much
- faster when our network is down and then comes back. Bugfix on
- 0.1.2.8-beta; found by lodger.
- - When Tor clients restart after 1-5 days, they discard all their
- cached descriptors as too old, but they still use the cached
- consensus document. This approach is good for robustness, but
- bad for performance: since they don't know any bandwidths, they
- end up choosing at random rather than weighting their choice by
- speed. Fixed by the above feature of putting bandwidths in the
- consensus.
- o Major bugfixes (relays):
- - Relays were falling out of the networkstatus consensus for
- part of a day if they changed their local config but the
- authorities discarded their new descriptor as "not sufficiently
- different". Now directory authorities accept a descriptor as changed
- if BandwidthRate or BandwidthBurst changed. Partial fix for bug 962;
- patch by Sebastian.
- - Ensure that two circuits can never exist on the same connection
- with the same circuit ID, even if one is marked for close. This
- is conceivably a bugfix for bug 779; fixes a bug on 0.1.0.4-rc.
- - Directory authorities were neglecting to mark relays down in their
- internal histories if the relays fall off the routerlist without
- ever being found unreachable. So there were relays in the histories
- that haven't been seen for eight months, and are listed as being
- up for eight months. This wreaked havoc on the "median wfu" and
- "median mtbf" calculations, in turn making Guard and Stable flags
- wrong, hurting network performance. Fixes bugs 696 and 969. Bugfix
- on 0.2.0.6-alpha.
- o Major bugfixes (hidden services):
- - When establishing a hidden service, introduction points that
- originate from cannibalized circuits were completely ignored
- and not included in rendezvous service descriptors. This might
- have been another reason for delay in making a hidden service
- available. Bugfix from long ago (0.0.9.x?)
- o Major bugfixes (memory and resource management):
- - Fixed some memory leaks -- some quite frequent, some almost
- impossible to trigger -- based on results from Coverity.
- - Speed up parsing and cut down on memory fragmentation by using
- stack-style allocations for parsing directory objects. Previously,
- this accounted for over 40% of allocations from within Tor's code
- on a typical directory cache.
- - Use a Bloom filter rather than a digest-based set to track which
- descriptors we need to keep around when we're cleaning out old
- router descriptors. This speeds up the computation significantly,
- and may reduce fragmentation.
- o New/changed config options:
- - Now NodeFamily and MyFamily config options allow spaces in
- identity fingerprints, so it's easier to paste them in.
- Suggested by Lucky Green.
- - Allow ports 465 and 587 in the default exit policy again. We had
- rejected them in 0.1.0.15, because back in 2005 they were commonly
- misconfigured and ended up as spam targets. We hear they are better
- locked down these days.
- - Make TrackHostExit mappings expire a while after their last use, not
- after their creation. Patch from Robert Hogan.
- - Add an ExcludeExitNodes option so users can list a set of nodes
- that should be be excluded from the exit node position, but
- allowed elsewhere. Implements proposal 151.
- - New --hush command-line option similar to --quiet. While --quiet
- disables all logging to the console on startup, --hush limits the
- output to messages of warning and error severity.
- - New configure/torrc options (--enable-geoip-stats,
- DirRecordUsageByCountry) to record how many IPs we've served
- directory info to in each country code, how many status documents
- total we've sent to each country code, and what share of the total
- directory requests we should expect to see.
- - Make outbound DNS packets respect the OutboundBindAddress setting.
- Fixes the bug part of bug 798. Bugfix on 0.1.2.2-alpha.
- - Allow separate log levels to be configured for different logging
- domains. For example, this allows one to log all notices, warnings,
- or errors, plus all memory management messages of level debug or
- higher, with: Log [MM] debug-err [*] notice-err file /var/log/tor.
- - Update to the "June 3 2009" ip-to-country file.
- o Minor features (relays):
- - Raise the minimum rate limiting to be a relay from 20000 bytes
- to 20480 bytes (aka 20KB/s), to match our documentation. Also
- update directory authorities so they always assign the Fast flag
- to relays with 20KB/s of capacity. Now people running relays won't
- suddenly find themselves not seeing any use, if the network gets
- faster on average.
- - If we're a relay and we change our IP address, be more verbose
- about the reason that made us change. Should help track down
- further bugs for relays on dynamic IP addresses.
- - Exit servers can now answer resolve requests for ip6.arpa addresses.
- - Implement most of Proposal 152: allow specialized servers to permit
- single-hop circuits, and clients to use those servers to build
- single-hop circuits when using a specialized controller. Patch
- from Josh Albrecht. Resolves feature request 768.
- - When relays do their initial bandwidth measurement, don't limit
- to just our entry guards for the test circuits. Otherwise we tend
- to have multiple test circuits going through a single entry guard,
- which makes our bandwidth test less accurate. Fixes part of bug 654;
- patch contributed by Josh Albrecht.
- o Minor features (directory authorities):
- - Try not to open more than one descriptor-downloading connection
- to an authority at once. This should reduce load on directory
- authorities. Fixes bug 366.
- - Add cross-certification to newly generated certificates, so that
- a signing key is enough information to look up a certificate. Start
- serving certificates by <identity digest, signing key digest>
- pairs. Implements proposal 157.
- - When a directory authority downloads a descriptor that it then
- immediately rejects, do not retry downloading it right away. Should
- save some bandwidth on authorities. Fix for bug 888. Patch by
- Sebastian Hahn.
- - Directory authorities now serve a /tor/dbg-stability.txt URL to
- help debug WFU and MTBF calculations.
- - In directory authorities' approved-routers files, allow
- fingerprints with or without space.
- o Minor features (directory mirrors):
- - When a download gets us zero good descriptors, do not notify
- Tor that new directory information has arrived.
- - Servers support a new URL scheme for consensus downloads that
- allows the client to specify which authorities are trusted.
- The server then only sends the consensus if the client will trust
- it. Otherwise a 404 error is sent back. Clients use this
- new scheme when the server supports it (meaning it's running
- 0.2.1.1-alpha or later). Implements proposal 134.
- o Minor features (bridges):
- - If the bridge config line doesn't specify a port, assume 443.
- This makes bridge lines a bit smaller and easier for users to
- understand.
- - If we're using bridges and our network goes away, be more willing
- to forgive our bridges and try again when we get an application
- request.
- o Minor features (hidden services):
- - When the client launches an introduction circuit, retry with a
- new circuit after 30 seconds rather than 60 seconds.
- - Launch a second client-side introduction circuit in parallel
- after a delay of 15 seconds (based on work by Christian Wilms).
- - Hidden services start out building five intro circuits rather
- than three, and when the first three finish they publish a service
- descriptor using those. Now we publish our service descriptor much
- faster after restart.
- - Drop the requirement to have an open dir port for storing and
- serving v2 hidden service descriptors.
- o Minor features (build and packaging):
- - On Linux, use the prctl call to re-enable core dumps when the User
- option is set.
- - Try to make sure that the version of Libevent we're running with
- is binary-compatible with the one we built with. May address bug
- 897 and others.
- - Add a new --enable-local-appdata configuration switch to change
- the default location of the datadir on win32 from APPDATA to
- LOCAL_APPDATA. In the future, we should migrate to LOCAL_APPDATA
- entirely. Patch from coderman.
- - Build correctly against versions of OpenSSL 0.9.8 or later that
- are built without support for deprecated functions.
- - On platforms with a maximum syslog string length, truncate syslog
- messages to that length ourselves, rather than relying on the
- system to do it for us.
- - Automatically detect MacOSX versions earlier than 10.4.0, and
- disable kqueue from inside Tor when running with these versions.
- We previously did this from the startup script, but that was no
- help to people who didn't use the startup script. Resolves bug 863.
- - Build correctly when configured to build outside the main source
- path. Patch from Michael Gold.
- - Disable GCC's strict alias optimization by default, to avoid the
- likelihood of its introducing subtle bugs whenever our code violates
- the letter of C99's alias rules.
- - Change the contrib/tor.logrotate script so it makes the new
- logs as "_tor:_tor" rather than the default, which is generally
- "root:wheel". Fixes bug 676, reported by Serge Koksharov.
- - Change our header file guard macros to be less likely to conflict
- with system headers. Adam Langley noticed that we were conflicting
- with log.h on Android.
- - Add a couple of extra warnings to --enable-gcc-warnings for GCC 4.3,
- and stop using a warning that had become unfixably verbose under
- GCC 4.3.
- - Use a lockfile to make sure that two Tor processes are not
- simultaneously running with the same datadir.
- - Allow OpenSSL to use dynamic locks if it wants.
- - Add LIBS=-lrt to Makefile.am so the Tor RPMs use a static libevent.
- o Minor features (controllers):
- - When generating circuit events with verbose nicknames for
- controllers, try harder to look up nicknames for routers on a
- circuit. (Previously, we would look in the router descriptors we had
- for nicknames, but not in the consensus.) Partial fix for bug 941.
- - New controller event NEWCONSENSUS that lists the networkstatus
- lines for every recommended relay. Now controllers like Torflow
- can keep up-to-date on which relays they should be using.
- - New controller event "clients_seen" to report a geoip-based summary
- of which countries we've seen clients from recently. Now controllers
- like Vidalia can show bridge operators that they're actually making
- a difference.
- - Add a 'getinfo status/clients-seen' controller command, in case
- controllers want to hear clients_seen events but connect late.
- - New CONSENSUS_ARRIVED event to note when a new consensus has
- been fetched and validated.
- - Add an internal-use-only __ReloadTorrcOnSIGHUP option for
- controllers to prevent SIGHUP from reloading the configuration.
- Fixes bug 856.
- - Return circuit purposes in response to GETINFO circuit-status.
- Fixes bug 858.
- - Serve the latest v3 networkstatus consensus via the control
- port. Use "getinfo dir/status-vote/current/consensus" to fetch it.
- - Add a "GETINFO /status/bootstrap-phase" controller option, so the
- controller can query our current bootstrap state in case it attaches
- partway through and wants to catch up.
- - Provide circuit purposes along with circuit events to the controller.
- o Minor features (tools):
- - Do not have tor-resolve automatically refuse all .onion addresses;
- if AutomapHostsOnResolve is set in your torrc, this will work fine.
- - Add a -p option to tor-resolve for specifying the SOCKS port: some
- people find host:port too confusing.
- - Print the SOCKS5 error message string as well as the error code
- when a tor-resolve request fails. Patch from Jacob.
- o Minor bugfixes (memory and resource management):
- - Clients no longer cache certificates for authorities they do not
- recognize. Bugfix on 0.2.0.9-alpha.
- - Do not use C's stdio library for writing to log files. This will
- improve logging performance by a minute amount, and will stop
- leaking fds when our disk is full. Fixes bug 861.
- - Stop erroneous use of O_APPEND in cases where we did not in fact
- want to re-seek to the end of a file before every last write().
- - Fix a small alignment and memory-wasting bug on buffer chunks.
- Spotted by rovv.
- - Add a malloc_good_size implementation to OpenBSD_malloc_linux.c,
- to avoid unused RAM in buffer chunks and memory pools.
- - Reduce the default smartlist size from 32 to 16; it turns out that
- most smartlists hold around 8-12 elements tops.
- - Make dumpstats() log the fullness and size of openssl-internal
- buffers.
- - If the user has applied the experimental SSL_MODE_RELEASE_BUFFERS
- patch to their OpenSSL, turn it on to save memory on servers. This
- patch will (with any luck) get included in a mainline distribution
- before too long.
- - Fix a memory leak when v3 directory authorities load their keys
- and cert from disk. Bugfix on 0.2.0.1-alpha.
- - Stop using malloc_usable_size() to use more area than we had
- actually allocated: it was safe, but made valgrind really unhappy.
- - Make the assert_circuit_ok() function work correctly on circuits that
- have already been marked for close.
- - Fix uninitialized size field for memory area allocation: may improve
- memory performance during directory parsing.
- o Minor bugfixes (clients):
- - Stop reloading the router list from disk for no reason when we
- run out of reachable directory mirrors. Once upon a time reloading
- it would set the 'is_running' flag back to 1 for them. It hasn't
- done that for a long time.
- - When we had picked an exit node for a connection, but marked it as
- "optional", and it turned out we had no onion key for the exit,
- stop wanting that exit and try again. This situation may not
- be possible now, but will probably become feasible with proposal
- 158. Spotted by rovv. Fixes another case of bug 752.
- - Fix a bug in address parsing that was preventing bridges or hidden
- service targets from being at IPv6 addresses.
- - Do not remove routers as too old if we do not have any consensus
- document. Bugfix on 0.2.0.7-alpha.
- - When an exit relay resolves a stream address to a local IP address,
- do not just keep retrying that same exit relay over and
- over. Instead, just close the stream. Addresses bug 872. Bugfix
- on 0.2.0.32. Patch from rovv.
- - Made Tor a little less aggressive about deleting expired
- certificates. Partial fix for bug 854.
- - Treat duplicate certificate fetches as failures, so that we do
- not try to re-fetch an expired certificate over and over and over.
- - Do not say we're fetching a certificate when we'll in fact skip it
- because of a pending download.
- - If we have correct permissions on $datadir, we complain to stdout
- and fail to start. But dangerous permissions on
- $datadir/cached-status/ would cause us to open a log and complain
- there. Now complain to stdout and fail to start in both cases. Fixes
- bug 820, reported by seeess.
- o Minor bugfixes (bridges):
- - When we made bridge authorities stop serving bridge descriptors over
- unencrypted links, we also broke DirPort reachability testing for
- bridges. So bridges with a non-zero DirPort were printing spurious
- warns to their logs. Bugfix on 0.2.0.16-alpha. Fixes bug 709.
- - Don't allow a bridge to publish its router descriptor to a
- non-bridge directory authority. Fixes part of bug 932.
- - When we change to or from being a bridge, reset our counts of
- client usage by country. Fixes bug 932.
- o Minor bugfixes (relays):
- - Log correct error messages for DNS-related network errors on
- Windows.
- - Actually return -1 in the error case for read_bandwidth_usage().
- Harmless bug, since we currently don't care about the return value
- anywhere. Bugfix on 0.2.0.9-alpha.
- - Provide a more useful log message if bug 977 (related to buffer
- freelists) ever reappears, and do not crash right away.
- - We were already rejecting relay begin cells with destination port
- of 0. Now also reject extend cells with destination port or address
- of 0. Suggested by lark.
- - When we can't transmit a DNS request due to a network error, retry
- it after a while, and eventually transmit a failing response to
- the RESOLVED cell. Bugfix on 0.1.2.5-alpha.
- - Solve a bug that kept hardware crypto acceleration from getting
- enabled when accounting was turned on. Fixes bug 907. Bugfix on
- 0.0.9pre6.
- - When a canonical connection appears later in our internal list
- than a noncanonical one for a given OR ID, always use the
- canonical one. Bugfix on 0.2.0.12-alpha. Fixes bug 805.
- Spotted by rovv.
- - Avoid some nasty corner cases in the logic for marking connections
- as too old or obsolete or noncanonical for circuits. Partial
- bugfix on bug 891.
- - Fix another interesting corner-case of bug 891 spotted by rovv:
- Previously, if two hosts had different amounts of clock drift, and
- one of them created a new connection with just the wrong timing,
- the other might decide to deprecate the new connection erroneously.
- Bugfix on 0.1.1.13-alpha.
- - If one win32 nameserver fails to get added, continue adding the
- rest, and don't automatically fail.
- - Fix a bug where an unreachable relay would establish enough
- reachability testing circuits to do a bandwidth test -- if
- we already have a connection to the middle hop of the testing
- circuit, then it could establish the last hop by using the existing
- connection. Bugfix on 0.1.2.2-alpha, exposed when we made testing
- circuits no longer use entry guards in 0.2.1.3-alpha.
- o Minor bugfixes (directory authorities):
- - Limit uploaded directory documents to be 16M rather than 500K.
- The directory authorities were refusing v3 consensus votes from
- other authorities, since the votes are now 504K. Fixes bug 959;
- bugfix on 0.0.2pre17 (where we raised it from 50K to 500K ;).
- - Directory authorities should never send a 503 "busy" response to
- requests for votes or keys. Bugfix on 0.2.0.8-alpha; exposed by
- bug 959.
- - Fix code so authorities _actually_ send back X-Descriptor-Not-New
- headers. Bugfix on 0.2.0.10-alpha.
- o Minor bugfixes (hidden services):
- - When we can't find an intro key for a v2 hidden service descriptor,
- fall back to the v0 hidden service descriptor and log a bug message.
- Workaround for bug 1024.
- - In very rare situations new hidden service descriptors were
- published earlier than 30 seconds after the last change to the
- service. (We currently think that a hidden service descriptor
- that's been stable for 30 seconds is worth publishing.)
- - If a hidden service sends us an END cell, do not consider
- retrying the connection; just close it. Patch from rovv.
- - If we are not using BEGIN_DIR cells, don't attempt to contact hidden
- service directories if they have no advertised dir port. Bugfix
- on 0.2.0.10-alpha.
- o Minor bugfixes (tools):
- - In the torify(1) manpage, mention that tsocks will leak your
- DNS requests.
- o Minor bugfixes (controllers):
- - If the controller claimed responsibility for a stream, but that
- stream never finished making its connection, it would live
- forever in circuit_wait state. Now we close it after SocksTimeout
- seconds. Bugfix on 0.1.2.7-alpha; reported by Mike Perry.
- - Make DNS resolved controller events into "CLOSED", not
- "FAILED". Bugfix on 0.1.2.5-alpha. Fix by Robert Hogan. Resolves
- bug 807.
- - The control port would close the connection before flushing long
- replies, such as the network consensus, if a QUIT command was issued
- before the reply had completed. Now, the control port flushes all
- pending replies before closing the connection. Also fix a spurious
- warning when a QUIT command is issued after a malformed or rejected
- AUTHENTICATE command, but before the connection was closed. Patch
- by Marcus Griep. Fixes bugs 1015 and 1016.
- - Fix a bug that made stream bandwidth get misreported to the
- controller.
- o Deprecated and removed features:
- - The old "tor --version --version" command, which would print out
- the subversion "Id" of most of the source files, is now removed. It
- turned out to be less useful than we'd expected, and harder to
- maintain.
- - RedirectExits has been removed. It was deprecated since
- 0.2.0.3-alpha.
- - Finally remove deprecated "EXTENDED_FORMAT" controller feature. It
- has been called EXTENDED_EVENTS since 0.1.2.4-alpha.
- - Cell pools are now always enabled; --disable-cell-pools is ignored.
- - Directory mirrors no longer fetch the v1 directory or
- running-routers files. They are obsolete, and nobody asks for them
- anymore. This is the first step to making v1 authorities obsolete.
- - Take out the TestVia config option, since it was a workaround for
- a bug that was fixed in Tor 0.1.1.21.
- - Mark RendNodes, RendExcludeNodes, HiddenServiceNodes, and
- HiddenServiceExcludeNodes as obsolete: they never worked properly,
- and nobody seems to be using them. Fixes bug 754. Bugfix on
- 0.1.0.1-rc. Patch from Christian Wilms.
- - Remove all backward-compatibility code for relays running
- versions of Tor so old that they no longer work at all on the
- Tor network.
- o Code simplifications and refactoring:
- - Tool-assisted documentation cleanup. Nearly every function or
- static variable in Tor should have its own documentation now.
- - Rename the confusing or_is_obsolete field to the more appropriate
- is_bad_for_new_circs, and move it to or_connection_t where it
- belongs.
- - Move edge-only flags from connection_t to edge_connection_t: not
- only is this better coding, but on machines of plausible alignment,
- it should save 4-8 bytes per connection_t. "Every little bit helps."
- - Rename ServerDNSAllowBrokenResolvConf to ServerDNSAllowBrokenConfig
- for consistency; keep old option working for backward compatibility.
- - Simplify the code for finding connections to use for a circuit.
- - Revise the connection_new functions so that a more typesafe variant
- exists. This will work better with Coverity, and let us find any
- actual mistakes we're making here.
- - Refactor unit testing logic so that dmalloc can be used sensibly
- with unit tests to check for memory leaks.
- - Move all hidden-service related fields from connection and circuit
- structure to substructures: this way they won't eat so much memory.
- - Squeeze 2-5% out of client performance (according to oprofile) by
- improving the implementation of some policy-manipulation functions.
- - Change the implementation of ExcludeNodes and ExcludeExitNodes to
- be more efficient. Formerly it was quadratic in the number of
- servers; now it should be linear. Fixes bug 509.
- - Save 16-22 bytes per open circuit by moving the n_addr, n_port,
- and n_conn_id_digest fields into a separate structure that's
- only needed when the circuit has not yet attached to an n_conn.
- - Optimize out calls to time(NULL) that occur for every IO operation,
- or for every cell. On systems like Windows where time() is a
- slow syscall, this fix will be slightly helpful.
- Changes in version 0.2.0.35 - 2009-06-24
- o Security fix:
- - Avoid crashing in the presence of certain malformed descriptors.
- Found by lark, and by automated fuzzing.
- - Fix an edge case where a malicious exit relay could convince a
- controller that the client's DNS question resolves to an internal IP
- address. Bug found and fixed by "optimist"; bugfix on 0.1.2.8-beta.
- o Major bugfixes:
- - Finally fix the bug where dynamic-IP relays disappear when their
- IP address changes: directory mirrors were mistakenly telling
- them their old address if they asked via begin_dir, so they
- never got an accurate answer about their new address, so they
- just vanished after a day. For belt-and-suspenders, relays that
- don't set Address in their config now avoid using begin_dir for
- all direct connections. Should fix bugs 827, 883, and 900.
- - Fix a timing-dependent, allocator-dependent, DNS-related crash bug
- that would occur on some exit nodes when DNS failures and timeouts
- occurred in certain patterns. Fix for bug 957.
- o Minor bugfixes:
- - When starting with a cache over a few days old, do not leak
- memory for the obsolete router descriptors in it. Bugfix on
- 0.2.0.33; fixes bug 672.
- - Hidden service clients didn't use a cached service descriptor that
- was older than 15 minutes, but wouldn't fetch a new one either,
- because there was already one in the cache. Now, fetch a v2
- descriptor unless the same descriptor was added to the cache within
- the last 15 minutes. Fixes bug 997; reported by Marcus Griep.
- Changes in version 0.2.0.34 - 2009-02-08
- Tor 0.2.0.34 features several more security-related fixes. You should
- upgrade, especially if you run an exit relay (remote crash) or a
- directory authority (remote infinite loop), or you're on an older
- (pre-XP) or not-recently-patched Windows (remote exploit).
- This release marks end-of-life for Tor 0.1.2.x. Those Tor versions
- have many known flaws, and nobody should be using them. You should
- upgrade. If you're using a Linux or BSD and its packages are obsolete,
- stop using those packages and upgrade anyway.
- o Security fixes:
- - Fix an infinite-loop bug on handling corrupt votes under certain
- circumstances. Bugfix on 0.2.0.8-alpha.
- - Fix a temporary DoS vulnerability that could be performed by
- a directory mirror. Bugfix on 0.2.0.9-alpha; reported by lark.
- - Avoid a potential crash on exit nodes when processing malformed
- input. Remote DoS opportunity. Bugfix on 0.2.0.33.
- - Do not accept incomplete ipv4 addresses (like 192.168.0) as valid.
- Spec conformance issue. Bugfix on Tor 0.0.2pre27.
- o Minor bugfixes:
- - Fix compilation on systems where time_t is a 64-bit integer.
- Patch from Matthias Drochner.
- - Don't consider expiring already-closed client connections. Fixes
- bug 893. Bugfix on 0.0.2pre20.
- Changes in version 0.2.0.33 - 2009-01-21
- Tor 0.2.0.33 fixes a variety of bugs that were making relays less
- useful to users. It also finally fixes a bug where a relay or client
- that's been off for many days would take a long time to bootstrap.
- This update also fixes an important security-related bug reported by
- Ilja van Sprundel. You should upgrade. (We'll send out more details
- about the bug once people have had some time to upgrade.)
- o Security fixes:
- - Fix a heap-corruption bug that may be remotely triggerable on
- some platforms. Reported by Ilja van Sprundel.
- o Major bugfixes:
- - When a stream at an exit relay is in state "resolving" or
- "connecting" and it receives an "end" relay cell, the exit relay
- would silently ignore the end cell and not close the stream. If
- the client never closes the circuit, then the exit relay never
- closes the TCP connection. Bug introduced in Tor 0.1.2.1-alpha;
- reported by "wood".
- - When sending CREATED cells back for a given circuit, use a 64-bit
- connection ID to find the right connection, rather than an addr:port
- combination. Now that we can have multiple OR connections between
- the same ORs, it is no longer possible to use addr:port to uniquely
- identify a connection.
- - Bridge relays that had DirPort set to 0 would stop fetching
- descriptors shortly after startup, and then briefly resume
- after a new bandwidth test and/or after publishing a new bridge
- descriptor. Bridge users that try to bootstrap from them would
- get a recent networkstatus but would get descriptors from up to
- 18 hours earlier, meaning most of the descriptors were obsolete
- already. Reported by Tas; bugfix on 0.2.0.13-alpha.
- - Prevent bridge relays from serving their 'extrainfo' document
- to anybody who asks, now that extrainfo docs include potentially
- sensitive aggregated client geoip summaries. Bugfix on
- 0.2.0.13-alpha.
- - If the cached networkstatus consensus is more than five days old,
- discard it rather than trying to use it. In theory it could be
- useful because it lists alternate directory mirrors, but in practice
- it just means we spend many minutes trying directory mirrors that
- are long gone from the network. Also discard router descriptors as
- we load them if they are more than five days old, since the onion
- key is probably wrong by now. Bugfix on 0.2.0.x. Fixes bug 887.
- o Minor bugfixes:
- - Do not mark smartlist_bsearch_idx() function as ATTR_PURE. This bug
- could make gcc generate non-functional binary search code. Bugfix
- on 0.2.0.10-alpha.
- - Build correctly on platforms without socklen_t.
- - Compile without warnings on solaris.
- - Avoid potential crash on internal error during signature collection.
- Fixes bug 864. Patch from rovv.
- - Correct handling of possible malformed authority signing key
- certificates with internal signature types. Fixes bug 880.
- Bugfix on 0.2.0.3-alpha.
- - Fix a hard-to-trigger resource leak when logging credential status.
- CID 349.
- - When we can't initialize DNS because the network is down, do not
- automatically stop Tor from starting. Instead, we retry failed
- dns_init() every 10 minutes, and change the exit policy to reject
- *:* until one succeeds. Fixes bug 691.
- - Use 64 bits instead of 32 bits for connection identifiers used with
- the controller protocol, to greatly reduce risk of identifier reuse.
- - When we're choosing an exit node for a circuit, and we have
- no pending streams, choose a good general exit rather than one that
- supports "all the pending streams". Bugfix on 0.1.1.x. Fix by rovv.
- - Fix another case of assuming, when a specific exit is requested,
- that we know more than the user about what hosts it allows.
- Fixes one case of bug 752. Patch from rovv.
- - Clip the MaxCircuitDirtiness config option to a minimum of 10
- seconds. Warn the user if lower values are given in the
- configuration. Bugfix on 0.1.0.1-rc. Patch by Sebastian.
- - Clip the CircuitBuildTimeout to a minimum of 30 seconds. Warn the
- user if lower values are given in the configuration. Bugfix on
- 0.1.1.17-rc. Patch by Sebastian.
- - Fix a memory leak when we decline to add a v2 rendezvous descriptor to
- the cache because we already had a v0 descriptor with the same ID.
- Bugfix on 0.2.0.18-alpha.
- - Fix a race condition when freeing keys shared between main thread
- and CPU workers that could result in a memory leak. Bugfix on
- 0.1.0.1-rc. Fixes bug 889.
- - Send a valid END cell back when a client tries to connect to a
- nonexistent hidden service port. Bugfix on 0.1.2.15. Fixes bug
- 840. Patch from rovv.
- - Check which hops rendezvous stream cells are associated with to
- prevent possible guess-the-streamid injection attacks from
- intermediate hops. Fixes another case of bug 446. Based on patch
- from rovv.
- - If a broken client asks a non-exit router to connect somewhere,
- do not even do the DNS lookup before rejecting the connection.
- Fixes another case of bug 619. Patch from rovv.
- - When a relay gets a create cell it can't decrypt (e.g. because it's
- using the wrong onion key), we were dropping it and letting the
- client time out. Now actually answer with a destroy cell. Fixes
- bug 904. Bugfix on 0.0.2pre8.
- o Minor bugfixes (hidden services):
- - Do not throw away existing introduction points on SIGHUP. Bugfix on
- 0.0.6pre1. Patch by Karsten. Fixes bug 874.
- o Minor features:
- - Report the case where all signatures in a detached set are rejected
- differently than the case where there is an error handling the
- detached set.
- - When we realize that another process has modified our cached
- descriptors, print out a more useful error message rather than
- triggering an assertion. Fixes bug 885. Patch from Karsten.
- - Implement the 0x20 hack to better resist DNS poisoning: set the
- case on outgoing DNS requests randomly, and reject responses that do
- not match the case correctly. This logic can be disabled with the
- ServerDNSRandomizeCase setting, if you are using one of the 0.3%
- of servers that do not reliably preserve case in replies. See
- "Increased DNS Forgery Resistance through 0x20-Bit Encoding"
- for more info.
- - Check DNS replies for more matching fields to better resist DNS
- poisoning.
- - Never use OpenSSL compression: it wastes RAM and CPU trying to
- compress cells, which are basically all encrypted, compressed, or
- both.
- Changes in version 0.2.0.32 - 2008-11-20
- Tor 0.2.0.32 fixes a major security problem in Debian and Ubuntu
- packages (and maybe other packages) noticed by Theo de Raadt, fixes
- a smaller security flaw that might allow an attacker to access local
- services, further improves hidden service performance, and fixes a
- variety of other issues.
- o Security fixes:
- - The "User" and "Group" config options did not clear the
- supplementary group entries for the Tor process. The "User" option
- is now more robust, and we now set the groups to the specified
- user's primary group. The "Group" option is now ignored. For more
- detailed logging on credential switching, set CREDENTIAL_LOG_LEVEL
- in common/compat.c to LOG_NOTICE or higher. Patch by Jacob Appelbaum
- and Steven Murdoch. Bugfix on 0.0.2pre14. Fixes bug 848 and 857.
- - The "ClientDNSRejectInternalAddresses" config option wasn't being
- consistently obeyed: if an exit relay refuses a stream because its
- exit policy doesn't allow it, we would remember what IP address
- the relay said the destination address resolves to, even if it's
- an internal IP address. Bugfix on 0.2.0.7-alpha; patch by rovv.
- o Major bugfixes:
- - Fix a DOS opportunity during the voting signature collection process
- at directory authorities. Spotted by rovv. Bugfix on 0.2.0.x.
- o Major bugfixes (hidden services):
- - When fetching v0 and v2 rendezvous service descriptors in parallel,
- we were failing the whole hidden service request when the v0
- descriptor fetch fails, even if the v2 fetch is still pending and
- might succeed. Similarly, if the last v2 fetch fails, we were
- failing the whole hidden service request even if a v0 fetch is
- still pending. Fixes bug 814. Bugfix on 0.2.0.10-alpha.
- - When extending a circuit to a hidden service directory to upload a
- rendezvous descriptor using a BEGIN_DIR cell, almost 1/6 of all
- requests failed, because the router descriptor has not been
- downloaded yet. In these cases, do not attempt to upload the
- rendezvous descriptor, but wait until the router descriptor is
- downloaded and retry. Likewise, do not attempt to fetch a rendezvous
- descriptor from a hidden service directory for which the router
- descriptor has not yet been downloaded. Fixes bug 767. Bugfix
- on 0.2.0.10-alpha.
- o Minor bugfixes:
- - Fix several infrequent memory leaks spotted by Coverity.
- - When testing for libevent functions, set the LDFLAGS variable
- correctly. Found by Riastradh.
- - Avoid a bug where the FastFirstHopPK 0 option would keep Tor from
- bootstrapping with tunneled directory connections. Bugfix on
- 0.1.2.5-alpha. Fixes bug 797. Found by Erwin Lam.
- - When asked to connect to A.B.exit:80, if we don't know the IP for A
- and we know that server B rejects most-but-not all connections to
- port 80, we would previously reject the connection. Now, we assume
- the user knows what they were asking for. Fixes bug 752. Bugfix
- on 0.0.9rc5. Diagnosed by BarkerJr.
- - If we overrun our per-second write limits a little, count this as
- having used up our write allocation for the second, and choke
- outgoing directory writes. Previously, we had only counted this when
- we had met our limits precisely. Fixes bug 824. Patch from by rovv.
- Bugfix on 0.2.0.x (??).
- - Remove the old v2 directory authority 'lefkada' from the default
- list. It has been gone for many months.
- - Stop doing unaligned memory access that generated bus errors on
- sparc64. Bugfix on 0.2.0.10-alpha. Fixes bug 862.
- - Make USR2 log-level switch take effect immediately. Bugfix on
- 0.1.2.8-beta.
- o Minor bugfixes (controller):
- - Make DNS resolved events into "CLOSED", not "FAILED". Bugfix on
- 0.1.2.5-alpha. Fix by Robert Hogan. Resolves bug 807.
- Changes in version 0.2.0.31 - 2008-09-03
- Tor 0.2.0.31 addresses two potential anonymity issues, starts to fix
- a big bug we're seeing where in rare cases traffic from one Tor stream
- gets mixed into another stream, and fixes a variety of smaller issues.
- o Major bugfixes:
- - Make sure that two circuits can never exist on the same connection
- with the same circuit ID, even if one is marked for close. This
- is conceivably a bugfix for bug 779. Bugfix on 0.1.0.4-rc.
- - Relays now reject risky extend cells: if the extend cell includes
- a digest of all zeroes, or asks to extend back to the relay that
- sent the extend cell, tear down the circuit. Ideas suggested
- by rovv.
- - If not enough of our entry guards are available so we add a new
- one, we might use the new one even if it overlapped with the
- current circuit's exit relay (or its family). Anonymity bugfix
- pointed out by rovv.
- o Minor bugfixes:
- - Recover 3-7 bytes that were wasted per memory chunk. Fixes bug
- 794; bug spotted by rovv. Bugfix on 0.2.0.1-alpha.
- - Correctly detect the presence of the linux/netfilter_ipv4.h header
- when building against recent kernels. Bugfix on 0.1.2.1-alpha.
- - Pick size of default geoip filename string correctly on windows.
- Fixes bug 806. Bugfix on 0.2.0.30.
- - Make the autoconf script accept the obsolete --with-ssl-dir
- option as an alias for the actually-working --with-openssl-dir
- option. Fix the help documentation to recommend --with-openssl-dir.
- Based on a patch by "Dave". Bugfix on 0.2.0.1-alpha.
- - When using the TransPort option on OpenBSD, and using the User
- option to change UID and drop privileges, make sure to open
- /dev/pf before dropping privileges. Fixes bug 782. Patch from
- Christopher Davis. Bugfix on 0.1.2.1-alpha.
- - Try to attach connections immediately upon receiving a RENDEZVOUS2
- or RENDEZVOUS_ESTABLISHED cell. This can save a second or two
- on the client side when connecting to a hidden service. Bugfix
- on 0.0.6pre1. Found and fixed by Christian Wilms; resolves bug 743.
- - When closing an application-side connection because its circuit is
- getting torn down, generate the stream event correctly. Bugfix on
- 0.1.2.x. Anonymous patch.
- Changes in version 0.2.0.30 - 2008-07-15
- This new stable release switches to a more efficient directory
- distribution design, adds features to make connections to the Tor
- network harder to block, allows Tor to act as a DNS proxy, adds separate
- rate limiting for relayed traffic to make it easier for clients to
- become relays, fixes a variety of potential anonymity problems, and
- includes the usual huge pile of other features and bug fixes.
- o New v3 directory design:
- - Tor now uses a new way to learn about and distribute information
- about the network: the directory authorities vote on a common
- network status document rather than each publishing their own
- opinion. Now clients and caches download only one networkstatus
- document to bootstrap, rather than downloading one for each
- authority. Clients only download router descriptors listed in
- the consensus. Implements proposal 101; see doc/spec/dir-spec.txt
- for details.
- - Set up moria1, tor26, and dizum as v3 directory authorities
- in addition to being v2 authorities. Also add three new ones:
- ides (run by Mike Perry), gabelmoo (run by Karsten Loesing), and
- dannenberg (run by CCC).
- - Switch to multi-level keys for directory authorities: now their
- long-term identity key can be kept offline, and they periodically
- generate a new signing key. Clients fetch the "key certificates"
- to keep up to date on the right keys. Add a standalone tool
- "tor-gencert" to generate key certificates. Implements proposal 103.
- - Add a new V3AuthUseLegacyKey config option to make it easier for
- v3 authorities to change their identity keys if another bug like
- Debian's OpenSSL RNG flaw appears.
- - Authorities and caches fetch the v2 networkstatus documents
- less often, now that v3 is recommended.
- o Make Tor connections stand out less on the wire:
- - Use an improved TLS handshake designed by Steven Murdoch in proposal
- 124, as revised in proposal 130. The new handshake is meant to
- be harder for censors to fingerprint, and it adds the ability
- to detect certain kinds of man-in-the-middle traffic analysis
- attacks. The new handshake format includes version negotiation for
- OR connections as described in proposal 105, which will allow us
- to improve Tor's link protocol more safely in the future.
- - Enable encrypted directory connections by default for non-relays,
- so censor tools that block Tor directory connections based on their
- plaintext patterns will no longer work. This means Tor works in
- certain censored countries by default again.
- - Stop including recognizeable strings in the commonname part of
- Tor's x509 certificates.
- o Implement bridge relays:
- - Bridge relays (or "bridges" for short) are Tor relays that aren't
- listed in the main Tor directory. Since there is no complete public
- list of them, even an ISP that is filtering connections to all the
- known Tor relays probably won't be able to block all the bridges.
- See doc/design-paper/blocking.pdf and proposal 125 for details.
- - New config option BridgeRelay that specifies you want to be a
- bridge relay rather than a normal relay. When BridgeRelay is set
- to 1, then a) you cache dir info even if your DirPort ins't on,
- and b) the default for PublishServerDescriptor is now "bridge"
- rather than "v2,v3".
- - New config option "UseBridges 1" for clients that want to use bridge
- relays instead of ordinary entry guards. Clients then specify
- bridge relays by adding "Bridge" lines to their config file. Users
- can learn about a bridge relay either manually through word of
- mouth, or by one of our rate-limited mechanisms for giving out
- bridge addresses without letting an attacker easily enumerate them
- all. See https://www.torproject.org/bridges for details.
- - Bridge relays behave like clients with respect to time intervals
- for downloading new v3 consensus documents -- otherwise they
- stand out. Bridge users now wait until the end of the interval,
- so their bridge relay will be sure to have a new consensus document.
- o Implement bridge directory authorities:
- - Bridge authorities are like normal directory authorities, except
- they don't serve a list of known bridges. Therefore users that know
- a bridge's fingerprint can fetch a relay descriptor for that bridge,
- including fetching updates e.g. if the bridge changes IP address,
- yet an attacker can't just fetch a list of all the bridges.
- - Set up Tonga as the default bridge directory authority.
- - Bridge authorities refuse to serve bridge descriptors or other
- bridge information over unencrypted connections (that is, when
- responding to direct DirPort requests rather than begin_dir cells.)
- - Bridge directory authorities do reachability testing on the
- bridges they know. They provide router status summaries to the
- controller via "getinfo ns/purpose/bridge", and also dump summaries
- to a file periodically, so we can keep internal stats about which
- bridges are functioning.
- - If bridge users set the UpdateBridgesFromAuthority config option,
- but the digest they ask for is a 404 on the bridge authority,
- they fall back to contacting the bridge directly.
- - Bridges always use begin_dir to publish their server descriptor to
- the bridge authority using an anonymous encrypted tunnel.
- - Early work on a "bridge community" design: if bridge authorities set
- the BridgePassword config option, they will serve a snapshot of
- known bridge routerstatuses from their DirPort to anybody who
- knows that password. Unset by default.
- - Tor now includes an IP-to-country GeoIP file, so bridge relays can
- report sanitized aggregated summaries in their extra-info documents
- privately to the bridge authority, listing which countries are
- able to reach them. We hope this mechanism will let us learn when
- certain countries start trying to block bridges.
- - Bridge authorities write bridge descriptors to disk, so they can
- reload them after a reboot. They can also export the descriptors
- to other programs, so we can distribute them to blocked users via
- the BridgeDB interface, e.g. via https://bridges.torproject.org/
- and bridges@torproject.org.
- o Tor can be a DNS proxy:
- - The new client-side DNS proxy feature replaces the need for
- dns-proxy-tor: Just set "DNSPort 9999", and Tor will now listen
- for DNS requests on port 9999, use the Tor network to resolve them
- anonymously, and send the reply back like a regular DNS server.
- The code still only implements a subset of DNS.
- - Add a new AutomapHostsOnResolve option: when it is enabled, any
- resolve request for hosts matching a given pattern causes Tor to
- generate an internal virtual address mapping for that host. This
- allows DNSPort to work sensibly with hidden service users. By
- default, .exit and .onion addresses are remapped; the list of
- patterns can be reconfigured with AutomapHostsSuffixes.
- - Add an "-F" option to tor-resolve to force a resolve for a .onion
- address. Thanks to the AutomapHostsOnResolve option, this is no
- longer a completely silly thing to do.
- o Major features (relay usability):
- - New config options RelayBandwidthRate and RelayBandwidthBurst:
- a separate set of token buckets for relayed traffic. Right now
- relayed traffic is defined as answers to directory requests, and
- OR connections that don't have any local circuits on them. See
- proposal 111 for details.
- - Create listener connections before we setuid to the configured
- User and Group. Now non-Windows users can choose port values
- under 1024, start Tor as root, and have Tor bind those ports
- before it changes to another UID. (Windows users could already
- pick these ports.)
- - Added a new ConstrainedSockets config option to set SO_SNDBUF and
- SO_RCVBUF on TCP sockets. Hopefully useful for Tor servers running
- on "vserver" accounts. Patch from coderman.
- o Major features (directory authorities):
- - Directory authorities track weighted fractional uptime and weighted
- mean-time-between failures for relays. WFU is suitable for deciding
- whether a node is "usually up", while MTBF is suitable for deciding
- whether a node is "likely to stay up." We need both, because
- "usually up" is a good requirement for guards, while "likely to
- stay up" is a good requirement for long-lived connections.
- - Directory authorities use a new formula for selecting which relays
- to advertise as Guards: they must be in the top 7/8 in terms of
- how long we have known about them, and above the median of those
- nodes in terms of weighted fractional uptime.
- - Directory authorities use a new formula for selecting which relays
- to advertise as Stable: when we have 4 or more days of data, use
- median measured MTBF rather than median declared uptime. Implements
- proposal 108.
- - Directory authorities accept and serve "extra info" documents for
- routers. Routers now publish their bandwidth-history lines in the
- extra-info docs rather than the main descriptor. This step saves
- 60% (!) on compressed router descriptor downloads. Servers upload
- extra-info docs to any authority that accepts them; directory
- authorities now allow multiple router descriptors and/or extra
- info documents to be uploaded in a single go. Authorities, and
- caches that have been configured to download extra-info documents,
- download them as needed. Implements proposal 104.
- - Authorities now list relays who have the same nickname as
- a different named relay, but list them with a new flag:
- "Unnamed". Now we can make use of relays that happen to pick the
- same nickname as a server that registered two years ago and then
- disappeared. Implements proposal 122.
- - Store routers in a file called cached-descriptors instead of in
- cached-routers. Initialize cached-descriptors from cached-routers
- if the old format is around. The new format allows us to store
- annotations along with descriptors, to record the time we received
- each descriptor, its source, and its purpose: currently one of
- general, controller, or bridge.
- o Major features (other):
- - New config options WarnPlaintextPorts and RejectPlaintextPorts so
- Tor can warn and/or refuse connections to ports commonly used with
- vulnerable-plaintext protocols. Currently we warn on ports 23,
- 109, 110, and 143, but we don't reject any. Based on proposal 129
- by Kevin Bauer and Damon McCoy.
- - Integrate Karsten Loesing's Google Summer of Code project to publish
- hidden service descriptors on a set of redundant relays that are a
- function of the hidden service address. Now we don't have to rely
- on three central hidden service authorities for publishing and
- fetching every hidden service descriptor. Implements proposal 114.
- - Allow tunnelled directory connections to ask for an encrypted
- "begin_dir" connection or an anonymized "uses a full Tor circuit"
- connection independently. Now we can make anonymized begin_dir
- connections for (e.g.) more secure hidden service posting and
- fetching.
- o Major bugfixes (crashes and assert failures):
- - Stop imposing an arbitrary maximum on the number of file descriptors
- used for busy servers. Bug reported by Olaf Selke; patch from
- Sebastian Hahn.
- - Avoid possible failures when generating a directory with routers
- with over-long versions strings, or too many flags set.
- - Fix a rare assert error when we're closing one of our threads:
- use a mutex to protect the list of logs, so we never write to the
- list as it's being freed. Fixes the very rare bug 575, which is
- kind of the revenge of bug 222.
- - Avoid segfault in the case where a badly behaved v2 versioning
- directory sends a signed networkstatus with missing client-versions.
- - When we hit an EOF on a log (probably because we're shutting down),
- don't try to remove the log from the list: just mark it as
- unusable. (Bulletproofs against bug 222.)
- o Major bugfixes (code security fixes):
- - Detect size overflow in zlib code. Reported by Justin Ferguson and
- Dan Kaminsky.
- - Rewrite directory tokenization code to never run off the end of
- a string. Fixes bug 455. Patch from croup.
- - Be more paranoid about overwriting sensitive memory on free(),
- as a defensive programming tactic to ensure forward secrecy.
- o Major bugfixes (anonymity fixes):
- - Reject requests for reverse-dns lookup of names that are in
- a private address space. Patch from lodger.
- - Never report that we've used more bandwidth than we're willing to
- relay: it leaks how much non-relay traffic we're using. Resolves
- bug 516.
- - As a client, do not believe any server that tells us that an
- address maps to an internal address space.
- - Warn about unsafe ControlPort configurations.
- - Directory authorities now call routers Fast if their bandwidth is
- at least 100KB/s, and consider their bandwidth adequate to be a
- Guard if it is at least 250KB/s, no matter the medians. This fix
- complements proposal 107.
- - Directory authorities now never mark more than 2 servers per IP as
- Valid and Running (or 5 on addresses shared by authorities).
- Implements proposal 109, by Kevin Bauer and Damon McCoy.
- - If we're a relay, avoid picking ourselves as an introduction point,
- a rendezvous point, or as the final hop for internal circuits. Bug
- reported by taranis and lodger.
- - Exit relays that are used as a client can now reach themselves
- using the .exit notation, rather than just launching an infinite
- pile of circuits. Fixes bug 641. Reported by Sebastian Hahn.
- - Fix a bug where, when we were choosing the 'end stream reason' to
- put in our relay end cell that we send to the exit relay, Tor
- clients on Windows were sometimes sending the wrong 'reason'. The
- anonymity problem is that exit relays may be able to guess whether
- the client is running Windows, thus helping partition the anonymity
- set. Down the road we should stop sending reasons to exit relays,
- or otherwise prevent future versions of this bug.
- - Only update guard status (usable / not usable) once we have
- enough directory information. This was causing us to discard all our
- guards on startup if we hadn't been running for a few weeks. Fixes
- bug 448.
- - When our directory information has been expired for a while, stop
- being willing to build circuits using it. Fixes bug 401.
- o Major bugfixes (peace of mind for relay operators)
- - Non-exit relays no longer answer "resolve" relay cells, so they
- can't be induced to do arbitrary DNS requests. (Tor clients already
- avoid using non-exit relays for resolve cells, but now servers
- enforce this too.) Fixes bug 619. Patch from lodger.
- - When we setconf ClientOnly to 1, close any current OR and Dir
- listeners. Reported by mwenge.
- o Major bugfixes (other):
- - If we only ever used Tor for hidden service lookups or posts, we
- would stop building circuits and start refusing connections after
- 24 hours, since we falsely believed that Tor was dormant. Reported
- by nwf.
- - Add a new __HashedControlSessionPassword option for controllers
- to use for one-off session password hashes that shouldn't get
- saved to disk by SAVECONF --- Vidalia users were accumulating a
- pile of HashedControlPassword lines in their torrc files, one for
- each time they had restarted Tor and then clicked Save. Make Tor
- automatically convert "HashedControlPassword" to this new option but
- only when it's given on the command line. Partial fix for bug 586.
- - Patch from "Andrew S. Lists" to catch when we contact a directory
- mirror at IP address X and he says we look like we're coming from
- IP address X. Otherwise this would screw up our address detection.
- - Reject uploaded descriptors and extrainfo documents if they're
- huge. Otherwise we'll cache them all over the network and it'll
- clog everything up. Suggested by Aljosha Judmayer.
- - When a hidden service was trying to establish an introduction point,
- and Tor *did* manage to reuse one of the preemptively built
- circuits, it didn't correctly remember which one it used,
- so it asked for another one soon after, until there were no
- more preemptive circuits, at which point it launched one from
- scratch. Bugfix on 0.0.9.x.
- o Rate limiting and load balancing improvements:
- - When we add data to a write buffer in response to the data on that
- write buffer getting low because of a flush, do not consider the
- newly added data as a candidate for immediate flushing, but rather
- make it wait until the next round of writing. Otherwise, we flush
- and refill recursively, and a single greedy TLS connection can
- eat all of our bandwidth.
- - When counting the number of bytes written on a TLS connection,
- look at the BIO actually used for writing to the network, not
- at the BIO used (sometimes) to buffer data for the network.
- Looking at different BIOs could result in write counts on the
- order of ULONG_MAX. Fixes bug 614.
- - If we change our MaxAdvertisedBandwidth and then reload torrc,
- Tor won't realize it should publish a new relay descriptor. Fixes
- bug 688, reported by mfr.
- - Avoid using too little bandwidth when our clock skips a few seconds.
- - Choose which bridge to use proportional to its advertised bandwidth,
- rather than uniformly at random. This should speed up Tor for
- bridge users. Also do this for people who set StrictEntryNodes.
- o Bootstrapping faster and building circuits more intelligently:
- - Fix bug 660 that was preventing us from knowing that we should
- preemptively build circuits to handle expected directory requests.
- - When we're checking if we have enough dir info for each relay
- to begin establishing circuits, make sure that we actually have
- the descriptor listed in the consensus, not just any descriptor.
- - Correctly notify one-hop connections when a circuit build has
- failed. Possible fix for bug 669. Found by lodger.
- - Clients now hold circuitless TLS connections open for 1.5 times
- MaxCircuitDirtiness (15 minutes), since it is likely that they'll
- rebuild a new circuit over them within that timeframe. Previously,
- they held them open only for KeepalivePeriod (5 minutes).
- o Performance improvements (memory):
- - Add OpenBSD malloc code from "phk" as an optional malloc
- replacement on Linux: some glibc libraries do very poorly with
- Tor's memory allocation patterns. Pass --enable-openbsd-malloc to
- ./configure to get the replacement malloc code.
- - Switch our old ring buffer implementation for one more like that
- used by free Unix kernels. The wasted space in a buffer with 1mb
- of data will now be more like 8k than 1mb. The new implementation
- also avoids realloc();realloc(); patterns that can contribute to
- memory fragmentation.
- - Change the way that Tor buffers data that it is waiting to write.
- Instead of queueing data cells in an enormous ring buffer for each
- client->OR or OR->OR connection, we now queue cells on a separate
- queue for each circuit. This lets us use less slack memory, and
- will eventually let us be smarter about prioritizing different kinds
- of traffic.
- - Reference-count and share copies of address policy entries; only 5%
- of them were actually distinct.
- - Tune parameters for cell pool allocation to minimize amount of
- RAM overhead used.
- - Keep unused 4k and 16k buffers on free lists, rather than wasting 8k
- for every single inactive connection_t. Free items from the
- 4k/16k-buffer free lists when they haven't been used for a while.
- - Make memory debugging information describe more about history
- of cell allocation, so we can help reduce our memory use.
- - Be even more aggressive about releasing RAM from small
- empty buffers. Thanks to our free-list code, this shouldn't be too
- performance-intensive.
- - Log malloc statistics from mallinfo() on platforms where it exists.
- - Use memory pools to allocate cells with better speed and memory
- efficiency, especially on platforms where malloc() is inefficient.
- - Add a --with-tcmalloc option to the configure script to link
- against tcmalloc (if present). Does not yet search for non-system
- include paths.
- o Performance improvements (socket management):
- - Count the number of open sockets separately from the number of
- active connection_t objects. This will let us avoid underusing
- our allocated connection limit.
- - We no longer use socket pairs to link an edge connection to an
- anonymous directory connection or a DirPort test connection.
- Instead, we track the link internally and transfer the data
- in-process. This saves two sockets per "linked" connection (at the
- client and at the server), and avoids the nasty Windows socketpair()
- workaround.
- - We were leaking a file descriptor if Tor started with a zero-length
- cached-descriptors file. Patch by "freddy77".
- o Performance improvements (CPU use):
- - Never walk through the list of logs if we know that no log target
- is interested in a given message.
- - Call routerlist_remove_old_routers() much less often. This should
- speed startup, especially on directory caches.
- - Base64 decoding was actually showing up on our profile when parsing
- the initial descriptor file; switch to an in-process all-at-once
- implementation that's about 3.5x times faster than calling out to
- OpenSSL.
- - Use a slightly simpler string hashing algorithm (copying Python's
- instead of Java's) and optimize our digest hashing algorithm to take
- advantage of 64-bit platforms and to remove some possibly-costly
- voodoo.
- - When implementing AES counter mode, update only the portions of the
- counter buffer that need to change, and don't keep separate
- network-order and host-order counters on big-endian hosts (where
- they are the same).
- - Add an in-place version of aes_crypt() so that we can avoid doing a
- needless memcpy() call on each cell payload.
- - Use Critical Sections rather than Mutexes for synchronizing threads
- on win32; Mutexes are heavier-weight, and designed for synchronizing
- between processes.
- o Performance improvements (bandwidth use):
- - Don't try to launch new descriptor downloads quite so often when we
- already have enough directory information to build circuits.
- - Version 1 directories are no longer generated in full. Instead,
- authorities generate and serve "stub" v1 directories that list
- no servers. This will stop Tor versions 0.1.0.x and earlier from
- working, but (for security reasons) nobody should be running those
- versions anyway.
- - Avoid going directly to the directory authorities even if you're a
- relay, if you haven't found yourself reachable yet or if you've
- decided not to advertise your dirport yet. Addresses bug 556.
- - If we've gone 12 hours since our last bandwidth check, and we
- estimate we have less than 50KB bandwidth capacity but we could
- handle more, do another bandwidth test.
- - Support "If-Modified-Since" when answering HTTP requests for
- directories, running-routers documents, and v2 and v3 networkstatus
- documents. (There's no need to support it for router descriptors,
- since those are downloaded by descriptor digest.)
- - Stop fetching directory info so aggressively if your DirPort is
- on but your ORPort is off; stop fetching v2 dir info entirely.
- You can override these choices with the new FetchDirInfoEarly
- config option.
- o Changed config option behavior (features):
- - Configuration files now accept C-style strings as values. This
- helps encode characters not allowed in the current configuration
- file format, such as newline or #. Addresses bug 557.
- - Add hidden services and DNSPorts to the list of things that make
- Tor accept that it has running ports. Change starting Tor with no
- ports from a fatal error to a warning; we might change it back if
- this turns out to confuse anybody. Fixes bug 579.
- - Make PublishServerDescriptor default to 1, so the default doesn't
- have to change as we invent new directory protocol versions.
- - Allow people to say PreferTunnelledDirConns rather than
- PreferTunneledDirConns, for those alternate-spellers out there.
- - Raise the default BandwidthRate/BandwidthBurst to 5MB/10MB, to
- accommodate the growing number of servers that use the default
- and are reaching it.
- - Make it possible to enable HashedControlPassword and
- CookieAuthentication at the same time.
- - When a TrackHostExits-chosen exit fails too many times in a row,
- stop using it. Fixes bug 437.
- o Changed config option behavior (bugfixes):
- - Do not read the configuration file when we've only been told to
- generate a password hash. Fixes bug 643. Bugfix on 0.0.9pre5. Fix
- based on patch from Sebastian Hahn.
- - Actually validate the options passed to AuthDirReject,
- AuthDirInvalid, AuthDirBadDir, and AuthDirBadExit.
- - Make "ClientOnly 1" config option disable directory ports too.
- - Don't stop fetching descriptors when FetchUselessDescriptors is
- set, even if we stop asking for circuits. Bug reported by tup
- and ioerror.
- - Servers used to decline to publish their DirPort if their
- BandwidthRate or MaxAdvertisedBandwidth were below a threshold. Now
- they look only at BandwidthRate and RelayBandwidthRate.
- - Treat "2gb" when given in torrc for a bandwidth as meaning 2gb,
- minus 1 byte: the actual maximum declared bandwidth.
- - Make "TrackHostExits ." actually work. Bugfix on 0.1.0.x.
- - Make the NodeFamilies config option work. (Reported by
- lodger -- it has never actually worked, even though we added it
- in Oct 2004.)
- - If Tor is invoked from something that isn't a shell (e.g. Vidalia),
- now we expand "-f ~/.tor/torrc" correctly. Suggested by Matt Edman.
- o New config options:
- - New configuration options AuthDirMaxServersPerAddr and
- AuthDirMaxServersperAuthAddr to override default maximum number
- of servers allowed on a single IP address. This is important for
- running a test network on a single host.
- - Three new config options (AlternateDirAuthority,
- AlternateBridgeAuthority, and AlternateHSAuthority) that let the
- user selectively replace the default directory authorities by type,
- rather than the all-or-nothing replacement that DirServer offers.
- - New config options AuthDirBadDir and AuthDirListBadDirs for
- authorities to mark certain relays as "bad directories" in the
- networkstatus documents. Also supports the "!baddir" directive in
- the approved-routers file.
- - New config option V2AuthoritativeDirectory that all v2 directory
- authorities must set. This lets v3 authorities choose not to serve
- v2 directory information.
- o Minor features (other):
- - When we're not serving v2 directory information, there is no reason
- to actually keep any around. Remove the obsolete files and directory
- on startup if they are very old and we aren't going to serve them.
- - When we negotiate a v2 link-layer connection (not yet implemented),
- accept RELAY_EARLY cells and turn them into RELAY cells if we've
- negotiated a v1 connection for their next step. Initial steps for
- proposal 110.
- - When we have no consensus, check FallbackNetworkstatusFile (defaults
- to $PREFIX/share/tor/fallback-consensus) for a consensus. This way
- we can start out knowing some directory caches. We don't ship with
- a fallback consensus by default though, because it was making
- bootstrapping take too long while we tried many down relays.
- - Authorities send back an X-Descriptor-Not-New header in response to
- an accepted-but-discarded descriptor upload. Partially implements
- fix for bug 535.
- - If we find a cached-routers file that's been sitting around for more
- than 28 days unmodified, then most likely it's a leftover from
- when we upgraded to 0.2.0.8-alpha. Remove it. It has no good
- routers anyway.
- - When we (as a cache) download a descriptor because it was listed
- in a consensus, remember when the consensus was supposed to expire,
- and don't expire the descriptor until then.
- - Optionally (if built with -DEXPORTMALLINFO) export the output
- of mallinfo via http, as tor/mallinfo.txt. Only accessible
- from localhost.
- - Tag every guard node in our state file with the version that
- we believe added it, or with our own version if we add it. This way,
- if a user temporarily runs an old version of Tor and then switches
- back to a new one, she doesn't automatically lose her guards.
- - When somebody requests a list of statuses or servers, and we have
- none of those, return a 404 rather than an empty 200.
- - Merge in some (as-yet-unused) IPv6 address manipulation code. (Patch
- from croup.)
- - Add an HSAuthorityRecordStats option that hidden service authorities
- can use to track statistics of overall hidden service usage without
- logging information that would be as useful to an attacker.
- - Allow multiple HiddenServicePort directives with the same virtual
- port; when they occur, the user is sent round-robin to one
- of the target ports chosen at random. Partially fixes bug 393 by
- adding limited ad-hoc round-robining.
- - Revamp file-writing logic so we don't need to have the entire
- contents of a file in memory at once before we write to disk. Tor,
- meet stdio.
- o Minor bugfixes (other):
- - Alter the code that tries to recover from unhandled write
- errors, to not try to flush onto a socket that's given us
- unhandled errors.
- - Directory mirrors no longer include a guess at the client's IP
- address if the connection appears to be coming from the same /24
- network; it was producing too many wrong guesses.
- - If we're trying to flush the last bytes on a connection (for
- example, when answering a directory request), reset the
- time-to-give-up timeout every time we manage to write something
- on the socket.
- - Reject router descriptors with out-of-range bandwidthcapacity or
- bandwidthburst values.
- - If we can't expand our list of entry guards (e.g. because we're
- using bridges or we have StrictEntryNodes set), don't mark relays
- down when they fail a directory request. Otherwise we're too quick
- to mark all our entry points down.
- - Authorities no longer send back "400 you're unreachable please fix
- it" errors to Tor servers that aren't online all the time. We're
- supposed to tolerate these servers now.
- - Let directory authorities startup even when they can't generate
- a descriptor immediately, e.g. because they don't know their
- address.
- - Correctly enforce that elements of directory objects do not appear
- more often than they are allowed to appear.
- - Stop allowing hibernating servers to be "stable" or "fast".
- - On Windows, we were preventing other processes from reading
- cached-routers while Tor was running. (Reported by janbar)
- - Check return values from pthread_mutex functions.
- - When opening /dev/null in finish_daemonize(), do not pass the
- O_CREAT flag. Fortify was complaining, and correctly so. Fixes
- bug 742; fix from Michael Scherer. Bugfix on 0.0.2pre19.
- o Controller features:
- - The GETCONF command now escapes and quotes configuration values
- that don't otherwise fit into the torrc file.
- - The SETCONF command now handles quoted values correctly.
- - Add "GETINFO/desc-annotations/id/<OR digest>" so controllers can
- ask about source, timestamp of arrival, purpose, etc. We need
- something like this to help Vidalia not do GeoIP lookups on bridge
- addresses.
- - Allow multiple HashedControlPassword config lines, to support
- multiple controller passwords.
- - Accept LF instead of CRLF on controller, since some software has a
- hard time generating real Internet newlines.
- - Add GETINFO values for the server status events
- "REACHABILITY_SUCCEEDED" and "GOOD_SERVER_DESCRIPTOR". Patch from
- Robert Hogan.
- - There is now an ugly, temporary "desc/all-recent-extrainfo-hack"
- GETINFO for Torstat to use until it can switch to using extrainfos.
- - New config option CookieAuthFile to choose a new location for the
- cookie authentication file, and config option
- CookieAuthFileGroupReadable to make it group-readable.
- - Add a SOURCE_ADDR field to STREAM NEW events so that controllers can
- match requests to applications. Patch from Robert Hogan.
- - Add a RESOLVE command to launch hostname lookups. Original patch
- from Robert Hogan.
- - Add GETINFO status/enough-dir-info to let controllers tell whether
- Tor has downloaded sufficient directory information. Patch from Tup.
- - You can now use the ControlSocket option to tell Tor to listen for
- controller connections on Unix domain sockets on systems that
- support them. Patch from Peter Palfrader.
- - New "GETINFO address-mappings/*" command to get address mappings
- with expiry information. "addr-mappings/*" is now deprecated.
- Patch from Tup.
- - Add a new config option __DisablePredictedCircuits designed for
- use by the controller, when we don't want Tor to build any circuits
- preemptively.
- - Let the controller specify HOP=%d as an argument to ATTACHSTREAM,
- so we can exit from the middle of the circuit.
- - Implement "getinfo status/circuit-established".
- - Implement "getinfo status/version/..." so a controller can tell
- whether the current version is recommended, and whether any versions
- are good, and how many authorities agree. Patch from "shibz".
- - Controllers should now specify cache=no or cache=yes when using
- the +POSTDESCRIPTOR command.
- - Add a "PURPOSE=" argument to "STREAM NEW" events, as suggested by
- Robert Hogan. Fixes the first part of bug 681.
- - When reporting clock skew, and we know that the clock is _at least
- as skewed_ as some value, but we don't know the actual value,
- report the value as a "minimum skew."
- o Controller bugfixes:
- - Generate "STATUS_SERVER" events rather than misspelled
- "STATUS_SEVER" events. Caught by mwenge.
- - Reject controller commands over 1MB in length, so rogue
- processes can't run us out of memory.
- - Change the behavior of "getinfo status/good-server-descriptor"
- so it doesn't return failure when any authority disappears.
- - Send NAMESERVER_STATUS messages for a single failed nameserver
- correctly.
- - When the DANGEROUS_VERSION controller status event told us we're
- running an obsolete version, it used the string "OLD" to describe
- it. Yet the "getinfo" interface used the string "OBSOLETE". Now use
- "OBSOLETE" in both cases.
- - Respond to INT and TERM SIGNAL commands before we execute the
- signal, in case the signal shuts us down. We had a patch in
- 0.1.2.1-alpha that tried to do this by queueing the response on
- the connection's buffer before shutting down, but that really
- isn't the same thing at all. Bug located by Matt Edman.
- - Provide DNS expiry times in GMT, not in local time. For backward
- compatibility, ADDRMAP events only provide GMT expiry in an extended
- field. "GETINFO address-mappings" always does the right thing.
- - Use CRLF line endings properly in NS events.
- - Make 'getinfo fingerprint' return a 551 error if we're not a
- server, so we match what the control spec claims we do. Reported
- by daejees.
- - Fix a typo in an error message when extendcircuit fails that
- caused us to not follow the \r\n-based delimiter protocol. Reported
- by daejees.
- - When tunneling an encrypted directory connection, and its first
- circuit fails, do not leave it unattached and ask the controller
- to deal. Fixes the second part of bug 681.
- - Treat some 403 responses from directory servers as INFO rather than
- WARN-severity events.
- o Portability / building / compiling:
- - When building with --enable-gcc-warnings, check for whether Apple's
- warning "-Wshorten-64-to-32" is available.
- - Support compilation to target iPhone; patch from cjacker huang.
- To build for iPhone, pass the --enable-iphone option to configure.
- - Port Tor to build and run correctly on Windows CE systems, using
- the wcecompat library. Contributed by Valerio Lupi.
- - Detect non-ASCII platforms (if any still exist) and refuse to
- build there: some of our code assumes that 'A' is 65 and so on.
- - Clear up some MIPSPro compiler warnings.
- - Make autoconf search for libevent, openssl, and zlib consistently.
- - Update deprecated macros in configure.in.
- - When warning about missing headers, tell the user to let us
- know if the compile succeeds anyway, so we can downgrade the
- warning.
- - Include the current subversion revision as part of the version
- string: either fetch it directly if we're in an SVN checkout, do
- some magic to guess it if we're in an SVK checkout, or use
- the last-detected version if we're building from a .tar.gz.
- Use this version consistently in log messages.
- - Correctly report platform name on Windows 95 OSR2 and Windows 98 SE.
- - Read resolv.conf files correctly on platforms where read() returns
- partial results on small file reads.
- - Build without verbose warnings even on gcc 4.2 and 4.3.
- - On Windows, correctly detect errors when listing the contents of
- a directory. Fix from lodger.
- - Run 'make test' as part of 'make dist', so we stop releasing so
- many development snapshots that fail their unit tests.
- - Add support to detect Libevent versions in the 1.4.x series
- on mingw.
- - Add command-line arguments to unit-test executable so that we can
- invoke any chosen test from the command line rather than having
- to run the whole test suite at once; and so that we can turn on
- logging for the unit tests.
- - Do not automatically run configure from autogen.sh. This
- non-standard behavior tended to annoy people who have built other
- programs.
- - Fix a macro/CPP interaction that was confusing some compilers:
- some GCCs don't like #if/#endif pairs inside macro arguments.
- Fixes bug 707.
- - Fix macro collision between OpenSSL 0.9.8h and Windows headers.
- Fixes bug 704; fix from Steven Murdoch.
- - Correctly detect transparent proxy support on Linux hosts that
- require in.h to be included before netfilter_ipv4.h. Patch
- from coderman.
- o Logging improvements:
- - When we haven't had any application requests lately, don't bother
- logging that we have expired a bunch of descriptors.
- - When attempting to open a logfile fails, tell us why.
- - Only log guard node status when guard node status has changed.
- - Downgrade the 3 most common "INFO" messages to "DEBUG". This will
- make "INFO" 75% less verbose.
- - When SafeLogging is disabled, log addresses along with all TLS
- errors.
- - Report TLS "zero return" case as a "clean close" and "IO error"
- as a "close". Stop calling closes "unexpected closes": existing
- Tors don't use SSL_close(), so having a connection close without
- the TLS shutdown handshake is hardly unexpected.
- - When we receive a consensus from the future, warn about skew.
- - Make "not enough dir info yet" warnings describe *why* Tor feels
- it doesn't have enough directory info yet.
- - On the USR1 signal, when dmalloc is in use, log the top 10 memory
- consumers. (We already do this on HUP.)
- - Give more descriptive well-formedness errors for out-of-range
- hidden service descriptor/protocol versions.
- - Stop recommending that every server operator send mail to tor-ops.
- Resolves bug 597. Bugfix on 0.1.2.x.
- - Improve skew reporting: try to give the user a better log message
- about how skewed they are, and how much this matters.
- - New --quiet command-line option to suppress the default console log.
- Good in combination with --hash-password.
- - Don't complain that "your server has not managed to confirm that its
- ports are reachable" if we haven't been able to build any circuits
- yet.
- - Detect the reason for failing to mmap a descriptor file we just
- wrote, and give a more useful log message. Fixes bug 533.
- - Always prepend "Bug: " to any log message about a bug.
- - When dumping memory usage, list bytes used in buffer memory
- free-lists.
- - When running with dmalloc, dump more stats on hup and on exit.
- - Put a platform string (e.g. "Linux i686") in the startup log
- message, so when people paste just their logs, we know if it's
- OpenBSD or Windows or what.
- - When logging memory usage, break down memory used in buffers by
- buffer type.
- - When we are reporting the DirServer line we just parsed, we were
- logging the second stanza of the key fingerprint, not the first.
- - Even though Windows is equally happy with / and \ as path separators,
- try to use \ consistently on Windows and / consistently on Unix: it
- makes the log messages nicer.
- - On OSX, stop warning the user that kqueue support in libevent is
- "experimental", since it seems to have worked fine for ages.
- o Contributed scripts and tools:
- - Update linux-tor-prio.sh script to allow QoS based on the uid of
- the Tor process. Patch from Marco Bonetti with tweaks from Mike
- Perry.
- - Include the "tor-ctrl.sh" bash script by Stefan Behte to provide
- Unix users an easy way to script their Tor process (e.g. by
- adjusting bandwidth based on the time of the day).
- - In the exitlist script, only consider the most recently published
- server descriptor for each server. Also, when the user requests
- a list of servers that _reject_ connections to a given address,
- explicitly exclude the IPs that also have servers that accept
- connections to that address. Resolves bug 405.
- - Include a new contrib/tor-exit-notice.html file that exit relay
- operators can put on their website to help reduce abuse queries.
- o Newly deprecated features:
- - The status/version/num-versioning and status/version/num-concurring
- GETINFO controller options are no longer useful in the v3 directory
- protocol: treat them as deprecated, and warn when they're used.
- - The RedirectExits config option is now deprecated.
- o Removed features:
- - Drop the old code to choke directory connections when the
- corresponding OR connections got full: thanks to the cell queue
- feature, OR conns don't get full any more.
- - Remove the old "dns worker" server DNS code: it hasn't been default
- since 0.1.2.2-alpha, and all the servers are using the new
- eventdns code.
- - Remove the code to generate the oldest (v1) directory format.
- - Remove support for the old bw_accounting file: we've been storing
- bandwidth accounting information in the state file since
- 0.1.2.5-alpha. This may result in bandwidth accounting errors
- if you try to upgrade from 0.1.1.x or earlier, or if you try to
- downgrade to 0.1.1.x or earlier.
- - Drop support for OpenSSL version 0.9.6. Just about nobody was using
- it, it had no AES, and it hasn't seen any security patches since
- 2004.
- - Stop overloading the circuit_t.onionskin field for both "onionskin
- from a CREATE cell that we are waiting for a cpuworker to be
- assigned" and "onionskin from an EXTEND cell that we are going to
- send to an OR as soon as we are connected". Might help with bug 600.
- - Remove the tor_strpartition() function: its logic was confused,
- and it was only used for one thing that could be implemented far
- more easily.
- - Remove the contrib scripts ExerciseServer.py, PathDemo.py,
- and TorControl.py, as they use the old v0 controller protocol,
- and are obsoleted by TorFlow anyway.
- - Drop support for v1 rendezvous descriptors, since we never used
- them anyway, and the code has probably rotted by now. Based on
- patch from Karsten Loesing.
- - Stop allowing address masks that do not correspond to bit prefixes.
- We have warned about these for a really long time; now it's time
- to reject them. (Patch from croup.)
- - Remove an optimization in the AES counter-mode code that assumed
- that the counter never exceeded 2^68. When the counter can be set
- arbitrarily as an IV (as it is by Karsten's new hidden services
- code), this assumption no longer holds.
- - Disable the SETROUTERPURPOSE controller command: it is now
- obsolete.
- Changes in version 0.1.2.19 - 2008-01-17
- Tor 0.1.2.19 fixes a huge memory leak on exit relays, makes the default
- exit policy a little bit more conservative so it's safer to run an
- exit relay on a home system, and fixes a variety of smaller issues.
- o Security fixes:
- - Exit policies now reject connections that are addressed to a
- relay's public (external) IP address too, unless
- ExitPolicyRejectPrivate is turned off. We do this because too
- many relays are running nearby to services that trust them based
- on network address.
- o Major bugfixes:
- - When the clock jumps forward a lot, do not allow the bandwidth
- buckets to become negative. Fixes bug 544.
- - Fix a memory leak on exit relays; we were leaking a cached_resolve_t
- on every successful resolve. Reported by Mike Perry.
- - Purge old entries from the "rephist" database and the hidden
- service descriptor database even when DirPort is zero.
- - Stop thinking that 0.1.2.x directory servers can handle "begin_dir"
- requests. Should ease bugs 406 and 419 where 0.1.2.x relays are
- crashing or mis-answering these requests.
- - When we decide to send a 503 response to a request for servers, do
- not then also send the server descriptors: this defeats the whole
- purpose. Fixes bug 539.
- o Minor bugfixes:
- - Changing the ExitPolicyRejectPrivate setting should cause us to
- rebuild our server descriptor.
- - Fix handling of hex nicknames when answering controller requests for
- networkstatus by name, or when deciding whether to warn about
- unknown routers in a config option. (Patch from mwenge.)
- - Fix a couple of hard-to-trigger autoconf problems that could result
- in really weird results on platforms whose sys/types.h files define
- nonstandard integer types.
- - Don't try to create the datadir when running --verify-config or
- --hash-password. Resolves bug 540.
- - If we were having problems getting a particular descriptor from the
- directory caches, and then we learned about a new descriptor for
- that router, we weren't resetting our failure count. Reported
- by lodger.
- - Although we fixed bug 539 (where servers would send HTTP status 503
- responses _and_ send a body too), there are still servers out there
- that haven't upgraded. Therefore, make clients parse such bodies
- when they receive them.
- - Run correctly on systems where rlim_t is larger than unsigned long.
- This includes some 64-bit systems.
- - Run correctly on platforms (like some versions of OS X 10.5) where
- the real limit for number of open files is OPEN_FILES, not rlim_max
- from getrlimit(RLIMIT_NOFILES).
- - Avoid a spurious free on base64 failure.
- - Avoid segfaults on certain complex invocations of
- router_get_by_hexdigest().
- - Fix rare bug on REDIRECTSTREAM control command when called with no
- port set: it could erroneously report an error when none had
- happened.
- Changes in version 0.1.2.18 - 2007-10-28
- Tor 0.1.2.18 fixes many problems including crash bugs, problems with
- hidden service introduction that were causing huge delays, and a big
- bug that was causing some servers to disappear from the network status
- lists for a few hours each day.
- o Major bugfixes (crashes):
- - If a connection is shut down abruptly because of something that
- happened inside connection_flushed_some(), do not call
- connection_finished_flushing(). Should fix bug 451:
- "connection_stop_writing: Assertion conn->write_event failed"
- Bugfix on 0.1.2.7-alpha.
- - Fix possible segfaults in functions called from
- rend_process_relay_cell().
- o Major bugfixes (hidden services):
- - Hidden services were choosing introduction points uniquely by
- hexdigest, but when constructing the hidden service descriptor
- they merely wrote the (potentially ambiguous) nickname.
- - Clients now use the v2 intro format for hidden service
- connections: they specify their chosen rendezvous point by identity
- digest rather than by (potentially ambiguous) nickname. These
- changes could speed up hidden service connections dramatically.
- o Major bugfixes (other):
- - Stop publishing a new server descriptor just because we get a
- HUP signal. This led (in a roundabout way) to some servers getting
- dropped from the networkstatus lists for a few hours each day.
- - When looking for a circuit to cannibalize, consider family as well
- as identity. Fixes bug 438. Bugfix on 0.1.0.x (which introduced
- circuit cannibalization).
- - When a router wasn't listed in a new networkstatus, we were leaving
- the flags for that router alone -- meaning it remained Named,
- Running, etc -- even though absence from the networkstatus means
- that it shouldn't be considered to exist at all anymore. Now we
- clear all the flags for routers that fall out of the networkstatus
- consensus. Fixes bug 529.
- o Minor bugfixes:
- - Don't try to access (or alter) the state file when running
- --list-fingerprint or --verify-config or --hash-password. Resolves
- bug 499.
- - When generating information telling us how to extend to a given
- router, do not try to include the nickname if it is
- absent. Resolves bug 467.
- - Fix a user-triggerable segfault in expand_filename(). (There isn't
- a way to trigger this remotely.)
- - When sending a status event to the controller telling it that an
- OR address is reachable, set the port correctly. (Previously we
- were reporting the dir port.)
- - Fix a minor memory leak whenever a controller sends the PROTOCOLINFO
- command. Bugfix on 0.1.2.17.
- - When loading bandwidth history, do not believe any information in
- the future. Fixes bug 434.
- - When loading entry guard information, do not believe any information
- in the future.
- - When we have our clock set far in the future and generate an
- onion key, then re-set our clock to be correct, we should not stop
- the onion key from getting rotated.
- - On some platforms, accept() can return a broken address. Detect
- this more quietly, and deal accordingly. Fixes bug 483.
- - It's not actually an error to find a non-pending entry in the DNS
- cache when canceling a pending resolve. Don't log unless stuff
- is fishy. Resolves bug 463.
- - Don't reset trusted dir server list when we set a configuration
- option. Patch from Robert Hogan.
- Changes in version 0.1.2.17 - 2007-08-30
- Tor 0.1.2.17 features a new Vidalia version in the Windows and OS
- X bundles. Vidalia 0.0.14 makes authentication required for the
- ControlPort in the default configuration, which addresses important
- security risks. Everybody who uses Vidalia (or another controller)
- should upgrade.
- In addition, this Tor update fixes major load balancing problems with
- path selection, which should speed things up a lot once many people
- have upgraded.
- o Major bugfixes (security):
- - We removed support for the old (v0) control protocol. It has been
- deprecated since Tor 0.1.1.1-alpha, and keeping it secure has
- become more of a headache than it's worth.
- o Major bugfixes (load balancing):
- - When choosing nodes for non-guard positions, weight guards
- proportionally less, since they already have enough load. Patch
- from Mike Perry.
- - Raise the "max believable bandwidth" from 1.5MB/s to 10MB/s. This
- will allow fast Tor servers to get more attention.
- - When we're upgrading from an old Tor version, forget our current
- guards and pick new ones according to the new weightings. These
- three load balancing patches could raise effective network capacity
- by a factor of four. Thanks to Mike Perry for measurements.
- o Major bugfixes (stream expiration):
- - Expire not-yet-successful application streams in all cases if
- they've been around longer than SocksTimeout. Right now there are
- some cases where the stream will live forever, demanding a new
- circuit every 15 seconds. Fixes bug 454; reported by lodger.
- o Minor features (controller):
- - Add a PROTOCOLINFO controller command. Like AUTHENTICATE, it
- is valid before any authentication has been received. It tells
- a controller what kind of authentication is expected, and what
- protocol is spoken. Implements proposal 119.
- o Minor bugfixes (performance):
- - Save on most routerlist_assert_ok() calls in routerlist.c, thus
- greatly speeding up loading cached-routers from disk on startup.
- - Disable sentinel-based debugging for buffer code: we squashed all
- the bugs that this was supposed to detect a long time ago, and now
- its only effect is to change our buffer sizes from nice powers of
- two (which platform mallocs tend to like) to values slightly over
- powers of two (which make some platform mallocs sad).
- o Minor bugfixes (misc):
- - If exit bandwidth ever exceeds one third of total bandwidth, then
- use the correct formula to weight exit nodes when choosing paths.
- Based on patch from Mike Perry.
- - Choose perfectly fairly among routers when choosing by bandwidth and
- weighting by fraction of bandwidth provided by exits. Previously, we
- would choose with only approximate fairness, and correct ourselves
- if we ran off the end of the list.
- - If we require CookieAuthentication but we fail to write the
- cookie file, we would warn but not exit, and end up in a state
- where no controller could authenticate. Now we exit.
- - If we require CookieAuthentication, stop generating a new cookie
- every time we change any piece of our config.
- - Refuse to start with certain directory authority keys, and
- encourage people using them to stop.
- - Terminate multi-line control events properly. Original patch
- from tup.
- - Fix a minor memory leak when we fail to find enough suitable
- servers to choose a circuit.
- - Stop leaking part of the descriptor when we run into a particularly
- unparseable piece of it.
- Changes in version 0.1.2.16 - 2007-08-01
- Tor 0.1.2.16 fixes a critical security vulnerability that allows a
- remote attacker in certain situations to rewrite the user's torrc
- configuration file. This can completely compromise anonymity of users
- in most configurations, including those running the Vidalia bundles,
- TorK, etc. Or worse.
- o Major security fixes:
- - Close immediately after missing authentication on control port;
- do not allow multiple authentication attempts.
- Changes in version 0.1.2.15 - 2007-07-17
- Tor 0.1.2.15 fixes several crash bugs, fixes some anonymity-related
- problems, fixes compilation on BSD, and fixes a variety of other
- bugs. Everybody should upgrade.
- o Major bugfixes (compilation):
- - Fix compile on FreeBSD/NetBSD/OpenBSD. Oops.
- o Major bugfixes (crashes):
- - Try even harder not to dereference the first character after
- an mmap(). Reported by lodger.
- - Fix a crash bug in directory authorities when we re-number the
- routerlist while inserting a new router.
- - When the cached-routers file is an even multiple of the page size,
- don't run off the end and crash. (Fixes bug 455; based on idea
- from croup.)
- - Fix eventdns.c behavior on Solaris: It is critical to include
- orconfig.h _before_ sys/types.h, so that we can get the expected
- definition of _FILE_OFFSET_BITS.
- o Major bugfixes (security):
- - Fix a possible buffer overrun when using BSD natd support. Bug
- found by croup.
- - When sending destroy cells from a circuit's origin, don't include
- the reason for tearing down the circuit. The spec says we didn't,
- and now we actually don't. Reported by lodger.
- - Keep streamids from different exits on a circuit separate. This
- bug may have allowed other routers on a given circuit to inject
- cells into streams. Reported by lodger; fixes bug 446.
- - If there's a never-before-connected-to guard node in our list,
- never choose any guards past it. This way we don't expand our
- guard list unless we need to.
- o Minor bugfixes (guard nodes):
- - Weight guard selection by bandwidth, so that low-bandwidth nodes
- don't get overused as guards.
- o Minor bugfixes (directory):
- - Correctly count the number of authorities that recommend each
- version. Previously, we were under-counting by 1.
- - Fix a potential crash bug when we load many server descriptors at
- once and some of them make others of them obsolete. Fixes bug 458.
- o Minor bugfixes (hidden services):
- - Stop tearing down the whole circuit when the user asks for a
- connection to a port that the hidden service didn't configure.
- Resolves bug 444.
- o Minor bugfixes (misc):
- - On Windows, we were preventing other processes from reading
- cached-routers while Tor was running. Reported by janbar.
- - Fix a possible (but very unlikely) bug in picking routers by
- bandwidth. Add a log message to confirm that it is in fact
- unlikely. Patch from lodger.
- - Backport a couple of memory leak fixes.
- - Backport miscellaneous cosmetic bugfixes.
- Changes in version 0.1.2.14 - 2007-05-25
- Tor 0.1.2.14 changes the addresses of two directory authorities (this
- change especially affects those who serve or use hidden services),
- and fixes several other crash- and security-related bugs.
- o Directory authority changes:
- - Two directory authorities (moria1 and moria2) just moved to new
- IP addresses. This change will particularly affect those who serve
- or use hidden services.
- o Major bugfixes (crashes):
- - If a directory server runs out of space in the connection table
- as it's processing a begin_dir request, it will free the exit stream
- but leave it attached to the circuit, leading to unpredictable
- behavior. (Reported by seeess, fixes bug 425.)
- - Fix a bug in dirserv_remove_invalid() that would cause authorities
- to corrupt memory under some really unlikely scenarios.
- - Tighten router parsing rules. (Bugs reported by Benedikt Boss.)
- - Avoid segfaults when reading from mmaped descriptor file. (Reported
- by lodger.)
- o Major bugfixes (security):
- - When choosing an entry guard for a circuit, avoid using guards
- that are in the same family as the chosen exit -- not just guards
- that are exactly the chosen exit. (Reported by lodger.)
- o Major bugfixes (resource management):
- - If a directory authority is down, skip it when deciding where to get
- networkstatus objects or descriptors. Otherwise we keep asking
- every 10 seconds forever. Fixes bug 384.
- - Count it as a failure if we fetch a valid network-status but we
- don't want to keep it. Otherwise we'll keep fetching it and keep
- not wanting to keep it. Fixes part of bug 422.
- - If all of our dirservers have given us bad or no networkstatuses
- lately, then stop hammering them once per minute even when we
- think they're failed. Fixes another part of bug 422.
- o Minor bugfixes:
- - Actually set the purpose correctly for descriptors inserted with
- purpose=controller.
- - When we have k non-v2 authorities in our DirServer config,
- we ignored the last k authorities in the list when updating our
- network-statuses.
- - Correctly back-off from requesting router descriptors that we are
- having a hard time downloading.
- - Read resolv.conf files correctly on platforms where read() returns
- partial results on small file reads.
- - Don't rebuild the entire router store every time we get 32K of
- routers: rebuild it when the journal gets very large, or when
- the gaps in the store get very large.
- o Minor features:
- - When routers publish SVN revisions in their router descriptors,
- authorities now include those versions correctly in networkstatus
- documents.
- - Warn when using a version of libevent before 1.3b to run a server on
- OSX or BSD: these versions interact badly with userspace threads.
- Changes in version 0.1.2.13 - 2007-04-24
- This release features some major anonymity fixes, such as safer path
- selection; better client performance; faster bootstrapping, better
- address detection, and better DNS support for servers; write limiting as
- well as read limiting to make servers easier to run; and a huge pile of
- other features and bug fixes. The bundles also ship with Vidalia 0.0.11.
- Tor 0.1.2.13 is released in memory of Rob Levin (1955-2006), aka lilo
- of the Freenode IRC network, remembering his patience and vision for
- free speech on the Internet.
- o Major features, client performance:
- - Weight directory requests by advertised bandwidth. Now we can
- let servers enable write limiting but still allow most clients to
- succeed at their directory requests. (We still ignore weights when
- choosing a directory authority; I hope this is a feature.)
- - Stop overloading exit nodes -- avoid choosing them for entry or
- middle hops when the total bandwidth available from non-exit nodes
- is much higher than the total bandwidth available from exit nodes.
- - Rather than waiting a fixed amount of time between retrying
- application connections, we wait only 10 seconds for the first,
- 10 seconds for the second, and 15 seconds for each retry after
- that. Hopefully this will improve the expected user experience.
- - Sometimes we didn't bother sending a RELAY_END cell when an attempt
- to open a stream fails; now we do in more cases. This should
- make clients able to find a good exit faster in some cases, since
- unhandleable requests will now get an error rather than timing out.
- o Major features, client functionality:
- - Implement BEGIN_DIR cells, so we can connect to a directory
- server via TLS to do encrypted directory requests rather than
- plaintext. Enable via the TunnelDirConns and PreferTunneledDirConns
- config options if you like. For now, this feature only works if
- you already have a descriptor for the destination dirserver.
- - Add support for transparent application connections: this basically
- bundles the functionality of trans-proxy-tor into the Tor
- mainline. Now hosts with compliant pf/netfilter implementations
- can redirect TCP connections straight to Tor without diverting
- through SOCKS. (Based on patch from tup.)
- - Add support for using natd; this allows FreeBSDs earlier than
- 5.1.2 to have ipfw send connections through Tor without using
- SOCKS. (Patch from Zajcev Evgeny with tweaks from tup.)
- o Major features, servers:
- - Setting up a dyndns name for your server is now optional: servers
- with no hostname or IP address will learn their IP address by
- asking the directory authorities. This code only kicks in when you
- would normally have exited with a "no address" error. Nothing's
- authenticated, so use with care.
- - Directory servers now spool server descriptors, v1 directories,
- and v2 networkstatus objects to buffers as needed rather than en
- masse. They also mmap the cached-routers files. These steps save
- lots of memory.
- - Stop requiring clients to have well-formed certificates, and stop
- checking nicknames in certificates. (Clients have certificates so
- that they can look like Tor servers, but in the future we might want
- to allow them to look like regular TLS clients instead. Nicknames
- in certificates serve no purpose other than making our protocol
- easier to recognize on the wire.) Implements proposal 106.
- o Improvements on DNS support:
- - Add "eventdns" asynchronous dns library originally based on code
- from Adam Langley. Now we can discard the old rickety dnsworker
- concept, and support a wider variety of DNS functions. Allows
- multithreaded builds on NetBSD and OpenBSD again.
- - Add server-side support for "reverse" DNS lookups (using PTR
- records so clients can determine the canonical hostname for a given
- IPv4 address). Only supported by servers using eventdns; servers
- now announce in their descriptors if they don't support eventdns.
- - Workaround for name servers (like Earthlink's) that hijack failing
- DNS requests and replace the no-such-server answer with a "helpful"
- redirect to an advertising-driven search portal. Also work around
- DNS hijackers who "helpfully" decline to hijack known-invalid
- RFC2606 addresses. Config option "ServerDNSDetectHijacking 0"
- lets you turn it off.
- - Servers now check for the case when common DNS requests are going to
- wildcarded addresses (i.e. all getting the same answer), and change
- their exit policy to reject *:* if it's happening.
- - When asked to resolve a hostname, don't use non-exit servers unless
- requested to do so. This allows servers with broken DNS to be
- useful to the network.
- - Start passing "ipv4" hints to getaddrinfo(), so servers don't do
- useless IPv6 DNS resolves.
- - Specify and implement client-side SOCKS5 interface for reverse DNS
- lookups (see doc/socks-extensions.txt). Also cache them.
- - When we change nameservers or IP addresses, reset and re-launch
- our tests for DNS hijacking.
- o Improvements on reachability testing:
- - Servers send out a burst of long-range padding cells once they've
- established that they're reachable. Spread them over 4 circuits,
- so hopefully a few will be fast. This exercises bandwidth and
- bootstraps them into the directory more quickly.
- - When we find our DirPort to be reachable, publish a new descriptor
- so we'll tell the world (reported by pnx).
- - Directory authorities now only decide that routers are reachable
- if their identity keys are as expected.
- - Do DirPort reachability tests less often, since a single test
- chews through many circuits before giving up.
- - Avoid some false positives during reachability testing: don't try
- to test via a server that's on the same /24 network as us.
- - Start publishing one minute or so after we find our ORPort
- to be reachable. This will help reduce the number of descriptors
- we have for ourselves floating around, since it's quite likely
- other things (e.g. DirPort) will change during that minute too.
- - Routers no longer try to rebuild long-term connections to directory
- authorities, and directory authorities no longer try to rebuild
- long-term connections to all servers. We still don't hang up
- connections in these two cases though -- we need to look at it
- more carefully to avoid flapping, and we likely need to wait til
- 0.1.1.x is obsolete.
- o Improvements on rate limiting:
- - Enable write limiting as well as read limiting. Now we sacrifice
- capacity if we're pushing out lots of directory traffic, rather
- than overrunning the user's intended bandwidth limits.
- - Include TLS overhead when counting bandwidth usage; previously, we
- would count only the bytes sent over TLS, but not the bytes used
- to send them.
- - Servers decline directory requests much more aggressively when
- they're low on bandwidth. Otherwise they end up queueing more and
- more directory responses, which can't be good for latency.
- - But never refuse directory requests from local addresses.
- - Be willing to read or write on local connections (e.g. controller
- connections) even when the global rate limiting buckets are empty.
- - Flush local controller connection buffers periodically as we're
- writing to them, so we avoid queueing 4+ megabytes of data before
- trying to flush.
- - Revise and clean up the torrc.sample that we ship with; add
- a section for BandwidthRate and BandwidthBurst.
- o Major features, NT services:
- - Install as NT_AUTHORITY\LocalService rather than as SYSTEM; add a
- command-line flag so that admins can override the default by saying
- "tor --service install --user "SomeUser"". This will not affect
- existing installed services. Also, warn the user that the service
- will look for its configuration file in the service user's
- %appdata% directory. (We can't do the "hardwire the user's appdata
- directory" trick any more, since we may not have read access to that
- directory.)
- - Support running the Tor service with a torrc not in the same
- directory as tor.exe and default to using the torrc located in
- the %appdata%\Tor\ of the user who installed the service. Patch
- from Matt Edman.
- - Add an --ignore-missing-torrc command-line option so that we can
- get the "use sensible defaults if the configuration file doesn't
- exist" behavior even when specifying a torrc location on the
- command line.
- - When stopping an NT service, wait up to 10 sec for it to actually
- stop. (Patch from Matt Edman; resolves bug 295.)
- o Directory authority improvements:
- - Stop letting hibernating or obsolete servers affect uptime and
- bandwidth cutoffs.
- - Stop listing hibernating servers in the v1 directory.
- - Authorities no longer recommend exits as guards if this would shift
- too much load to the exit nodes.
- - Authorities now specify server versions in networkstatus. This adds
- about 2% to the size of compressed networkstatus docs, and allows
- clients to tell which servers support BEGIN_DIR and which don't.
- The implementation is forward-compatible with a proposed future
- protocol version scheme not tied to Tor versions.
- - DirServer configuration lines now have an orport= option so
- clients can open encrypted tunnels to the authorities without
- having downloaded their descriptors yet. Enabled for moria1,
- moria2, tor26, and lefkada now in the default configuration.
- - Add a BadDirectory flag to network status docs so that authorities
- can (eventually) tell clients about caches they believe to be
- broken. Not used yet.
- - Allow authorities to list nodes as bad exits in their
- approved-routers file by fingerprint or by address. If most
- authorities set a BadExit flag for a server, clients don't think
- of it as a general-purpose exit. Clients only consider authorities
- that advertise themselves as listing bad exits.
- - Patch from Steve Hildrey: Generate network status correctly on
- non-versioning dirservers.
- - Have directory authorities allow larger amounts of drift in uptime
- without replacing the server descriptor: previously, a server that
- restarted every 30 minutes could have 48 "interesting" descriptors
- per day.
- - Reserve the nickname "Unnamed" for routers that can't pick
- a hostname: any router can call itself Unnamed; directory
- authorities will never allocate Unnamed to any particular router;
- clients won't believe that any router is the canonical Unnamed.
- o Directory mirrors and clients:
- - Discard any v1 directory info that's over 1 month old (for
- directories) or over 1 week old (for running-routers lists).
- - Clients track responses with status 503 from dirservers. After a
- dirserver has given us a 503, we try not to use it until an hour has
- gone by, or until we have no dirservers that haven't given us a 503.
- - When we get a 503 from a directory, and we're not a server, we no
- longer count the failure against the total number of failures
- allowed for the object we're trying to download.
- - Prepare for servers to publish descriptors less often: never
- discard a descriptor simply for being too old until either it is
- recommended by no authorities, or until we get a better one for
- the same router. Make caches consider retaining old recommended
- routers for even longer.
- - Directory servers now provide 'Pragma: no-cache' and 'Expires'
- headers for content, so that we can work better in the presence of
- caching HTTP proxies.
- - Stop fetching descriptors if you're not a dir mirror and you
- haven't tried to establish any circuits lately. (This currently
- causes some dangerous behavior, because when you start up again
- you'll use your ancient server descriptors.)
- o Major fixes, crashes:
- - Stop crashing when the controller asks us to resetconf more than
- one config option at once. (Vidalia 0.0.11 does this.)
- - Fix a longstanding obscure crash bug that could occur when we run
- out of DNS worker processes, if we're not using eventdns. (Resolves
- bug 390.)
- - Fix an assert that could trigger if a controller quickly set then
- cleared EntryNodes. (Bug found by Udo van den Heuvel.)
- - Avoid crash when telling controller about stream-status and a
- stream is detached.
- - Avoid sending junk to controllers or segfaulting when a controller
- uses EVENT_NEW_DESC with verbose nicknames.
- - Stop triggering asserts if the controller tries to extend hidden
- service circuits (reported by mwenge).
- - If we start a server with ClientOnly 1, then set ClientOnly to 0
- and hup, stop triggering an assert based on an empty onion_key.
- - Mask out all signals in sub-threads; only the libevent signal
- handler should be processing them. This should prevent some crashes
- on some machines using pthreads. (Patch from coderman.)
- - Disable kqueue on OS X 10.3 and earlier, to fix bug 371.
- o Major fixes, anonymity/security:
- - Automatically avoid picking more than one node from the same
- /16 network when constructing a circuit. Add an
- "EnforceDistinctSubnets" option to let people disable it if they
- want to operate private test networks on a single subnet.
- - When generating bandwidth history, round down to the nearest
- 1k. When storing accounting data, round up to the nearest 1k.
- - When we're running as a server, remember when we last rotated onion
- keys, so that we will rotate keys once they're a week old even if
- we never stay up for a week ourselves.
- - If a client asked for a server by name, and there's a named server
- in our network-status but we don't have its descriptor yet, we
- could return an unnamed server instead.
- - Reject (most) attempts to use Tor circuits with length one. (If
- many people start using Tor as a one-hop proxy, exit nodes become
- a more attractive target for compromise.)
- - Just because your DirPort is open doesn't mean people should be
- able to remotely teach you about hidden service descriptors. Now
- only accept rendezvous posts if you've got HSAuthoritativeDir set.
- - Fix a potential race condition in the rpm installer. Found by
- Stefan Nordhausen.
- - Do not log IPs with TLS failures for incoming TLS
- connections. (Fixes bug 382.)
- o Major fixes, other:
- - If our system clock jumps back in time, don't publish a negative
- uptime in the descriptor.
- - When we start during an accounting interval before it's time to wake
- up, remember to wake up at the correct time. (May fix bug 342.)
- - Previously, we would cache up to 16 old networkstatus documents
- indefinitely, if they came from nontrusted authorities. Now we
- discard them if they are more than 10 days old.
- - When we have a state file we cannot parse, tell the user and
- move it aside. Now we avoid situations where the user starts
- Tor in 1904, Tor writes a state file with that timestamp in it,
- the user fixes her clock, and Tor refuses to start.
- - Publish a new descriptor after we hup/reload. This is important
- if our config has changed such that we'll want to start advertising
- our DirPort now, etc.
- - If we are using an exit enclave and we can't connect, e.g. because
- its webserver is misconfigured to not listen on localhost, then
- back off and try connecting from somewhere else before we fail.
- o New config options or behaviors:
- - When EntryNodes are configured, rebuild the guard list to contain,
- in order: the EntryNodes that were guards before; the rest of the
- EntryNodes; the nodes that were guards before.
- - Do not warn when individual nodes in the configuration's EntryNodes,
- ExitNodes, etc are down: warn only when all possible nodes
- are down. (Fixes bug 348.)
- - Put a lower-bound on MaxAdvertisedBandwidth.
- - Start using the state file to store bandwidth accounting data:
- the bw_accounting file is now obsolete. We'll keep generating it
- for a while for people who are still using 0.1.2.4-alpha.
- - Try to batch changes to the state file so that we do as few
- disk writes as possible while still storing important things in
- a timely fashion.
- - The state file and the bw_accounting file get saved less often when
- the AvoidDiskWrites config option is set.
- - Make PIDFile work on Windows.
- - Add internal descriptions for a bunch of configuration options:
- accessible via controller interface and in comments in saved
- options files.
- - Reject *:563 (NNTPS) in the default exit policy. We already reject
- NNTP by default, so this seems like a sensible addition.
- - Clients now reject hostnames with invalid characters. This should
- avoid some inadvertent info leaks. Add an option
- AllowNonRFC953Hostnames to disable this behavior, in case somebody
- is running a private network with hosts called @, !, and #.
- - Check for addresses with invalid characters at the exit as well,
- and warn less verbosely when they fail. You can override this by
- setting ServerDNSAllowNonRFC953Addresses to 1.
- - Remove some options that have been deprecated since at least
- 0.1.0.x: AccountingMaxKB, LogFile, DebugLogFile, LogLevel, and
- SysLog. Use AccountingMax instead of AccountingMaxKB, and use Log
- to set log options. Mark PathlenCoinWeight as obsolete.
- - Stop accepting certain malformed ports in configured exit policies.
- - When the user uses bad syntax in the Log config line, stop
- suggesting other bad syntax as a replacement.
- - Add new config option "ResolvConf" to let the server operator
- choose an alternate resolve.conf file when using eventdns.
- - If one of our entry guards is on the ExcludeNodes list, or the
- directory authorities don't think it's a good guard, treat it as
- if it were unlisted: stop using it as a guard, and throw it off
- the guards list if it stays that way for a long time.
- - Allow directory authorities to be marked separately as authorities
- for the v1 directory protocol, the v2 directory protocol, and
- as hidden service directories, to make it easier to retire old
- authorities. V1 authorities should set "HSAuthoritativeDir 1"
- to continue being hidden service authorities too.
- - Remove 8888 as a LongLivedPort, and add 6697 (IRCS).
- - Make TrackExitHosts case-insensitive, and fix the behavior of
- ".suffix" TrackExitHosts items to avoid matching in the middle of
- an address.
- - New DirPort behavior: if you have your dirport set, you download
- descriptors aggressively like a directory mirror, whether or not
- your ORPort is set.
- o Docs:
- - Create a new file ReleaseNotes which was the old ChangeLog. The
- new ChangeLog file now includes the notes for all development
- versions too.
- - Add a new address-spec.txt document to describe our special-case
- addresses: .exit, .onion, and .noconnnect.
- - Fork the v1 directory protocol into its own spec document,
- and mark dir-spec.txt as the currently correct (v2) spec.
- o Packaging, porting, and contrib
- - "tor --verify-config" now exits with -1(255) or 0 depending on
- whether the config options are bad or good.
- - The Debian package now uses --verify-config when (re)starting,
- to distinguish configuration errors from other errors.
- - Adapt a patch from goodell to let the contrib/exitlist script
- take arguments rather than require direct editing.
- - Prevent the contrib/exitlist script from printing the same
- result more than once.
- - Add support to tor-resolve tool for reverse lookups and SOCKS5.
- - In the hidden service example in torrc.sample, stop recommending
- esoteric and discouraged hidden service options.
- - Patch from Michael Mohr to contrib/cross.sh, so it checks more
- values before failing, and always enables eventdns.
- - Try to detect Windows correctly when cross-compiling.
- - Libevent-1.2 exports, but does not define in its headers, strlcpy.
- Try to fix this in configure.in by checking for most functions
- before we check for libevent.
- - Update RPMs to require libevent 1.2.
- - Experimentally re-enable kqueue on OSX when using libevent 1.1b
- or later. Log when we are doing this, so we can diagnose it when
- it fails. (Also, recommend libevent 1.1b for kqueue and
- win32 methods; deprecate libevent 1.0b harder; make libevent
- recommendation system saner.)
- - Build with recent (1.3+) libevents on platforms that do not
- define the nonstandard types "u_int8_t" and friends.
- - Remove architecture from OS X builds. The official builds are
- now universal binaries.
- - Run correctly on OS X platforms with case-sensitive filesystems.
- - Correctly set maximum connection limit on Cygwin. (This time
- for sure!)
- - Start compiling on MinGW on Windows (patches from Mike Chiussi
- and many others).
- - Start compiling on MSVC6 on Windows (patches from Frediano Ziglio).
- - Finally fix the openssl warnings from newer gccs that believe that
- ignoring a return value is okay, but casting a return value and
- then ignoring it is a sign of madness.
- - On architectures where sizeof(int)>4, still clamp declarable
- bandwidth to INT32_MAX.
- o Minor features, controller:
- - Warn the user when an application uses the obsolete binary v0
- control protocol. We're planning to remove support for it during
- the next development series, so it's good to give people some
- advance warning.
- - Add STREAM_BW events to report per-entry-stream bandwidth
- use. (Patch from Robert Hogan.)
- - Rate-limit SIGNEWNYM signals in response to controllers that
- impolitely generate them for every single stream. (Patch from
- mwenge; closes bug 394.)
- - Add a REMAP status to stream events to note that a stream's
- address has changed because of a cached address or a MapAddress
- directive.
- - Make REMAP stream events have a SOURCE (cache or exit), and
- make them generated in every case where we get a successful
- connected or resolved cell.
- - Track reasons for OR connection failure; make these reasons
- available via the controller interface. (Patch from Mike Perry.)
- - Add a SOCKS_BAD_HOSTNAME client status event so controllers
- can learn when clients are sending malformed hostnames to Tor.
- - Specify and implement some of the controller status events.
- - Have GETINFO dir/status/* work on hosts with DirPort disabled.
- - Reimplement GETINFO so that info/names stays in sync with the
- actual keys.
- - Implement "GETINFO fingerprint".
- - Implement "SETEVENTS GUARD" so controllers can get updates on
- entry guard status as it changes.
- - Make all connections to addresses of the form ".noconnect"
- immediately get closed. This lets application/controller combos
- successfully test whether they're talking to the same Tor by
- watching for STREAM events.
- - Add a REASON field to CIRC events; for backward compatibility, this
- field is sent only to controllers that have enabled the extended
- event format. Also, add additional reason codes to explain why
- a given circuit has been destroyed or truncated. (Patches from
- Mike Perry)
- - Add a REMOTE_REASON field to extended CIRC events to tell the
- controller why a remote OR told us to close a circuit.
- - Stream events also now have REASON and REMOTE_REASON fields,
- working much like those for circuit events.
- - There's now a GETINFO ns/... field so that controllers can ask Tor
- about the current status of a router.
- - A new event type "NS" to inform a controller when our opinion of
- a router's status has changed.
- - Add a GETINFO events/names and GETINFO features/names so controllers
- can tell which events and features are supported.
- - A new CLEARDNSCACHE signal to allow controllers to clear the
- client-side DNS cache without expiring circuits.
- - Fix CIRC controller events so that controllers can learn the
- identity digests of non-Named servers used in circuit paths.
- - Let controllers ask for more useful identifiers for servers. Instead
- of learning identity digests for un-Named servers and nicknames
- for Named servers, the new identifiers include digest, nickname,
- and indication of Named status. Off by default; see control-spec.txt
- for more information.
- - Add a "getinfo address" controller command so it can display Tor's
- best guess to the user.
- - New controller event to alert the controller when our server
- descriptor has changed.
- - Give more meaningful errors on controller authentication failure.
- - Export the default exit policy via the control port, so controllers
- don't need to guess what it is / will be later.
- o Minor bugfixes, controller:
- - When creating a circuit via the controller, send a 'launched'
- event when we're done, so we follow the spec better.
- - Correct the control spec to match how the code actually responds
- to 'getinfo addr-mappings/*'. Reported by daejees.
- - The control spec described a GUARDS event, but the code
- implemented a GUARD event. Standardize on GUARD, but let people
- ask for GUARDS too. Reported by daejees.
- - Give the controller END_STREAM_REASON_DESTROY events _before_ we
- clear the corresponding on_circuit variable, and remember later
- that we don't need to send a redundant CLOSED event. (Resolves part
- 3 of bug 367.)
- - Report events where a resolve succeeded or where we got a socks
- protocol error correctly, rather than calling both of them
- "INTERNAL".
- - Change reported stream target addresses to IP consistently when
- we finally get the IP from an exit node.
- - Send log messages to the controller even if they happen to be very
- long.
- - Flush ERR-level controller status events just like we currently
- flush ERR-level log events, so that a Tor shutdown doesn't prevent
- the controller from learning about current events.
- - Report the circuit number correctly in STREAM CLOSED events. Bug
- reported by Mike Perry.
- - Do not report bizarre values for results of accounting GETINFOs
- when the last second's write or read exceeds the allotted bandwidth.
- - Report "unrecognized key" rather than an empty string when the
- controller tries to fetch a networkstatus that doesn't exist.
- - When the controller does a "GETINFO network-status", tell it
- about even those routers whose descriptors are very old, and use
- long nicknames where appropriate.
- - Fix handling of verbose nicknames with ORCONN controller events:
- make them show up exactly when requested, rather than exactly when
- not requested.
- - Controller signals now work on non-Unix platforms that don't define
- SIGUSR1 and SIGUSR2 the way we expect.
- - Respond to SIGNAL command before we execute the signal, in case
- the signal shuts us down. Suggested by Karsten Loesing.
- - Handle reporting OR_CONN_EVENT_NEW events to the controller.
- o Minor features, code performance:
- - Major performance improvement on inserting descriptors: change
- algorithm from O(n^2) to O(n).
- - Do not rotate onion key immediately after setting it for the first
- time.
- - Call router_have_min_dir_info half as often. (This is showing up in
- some profiles, but not others.)
- - When using GCC, make log_debug never get called at all, and its
- arguments never get evaluated, when no debug logs are configured.
- (This is showing up in some profiles, but not others.)
- - Statistics dumped by -USR2 now include a breakdown of public key
- operations, for profiling.
- - Make the common memory allocation path faster on machines where
- malloc(0) returns a pointer.
- - Split circuit_t into origin_circuit_t and or_circuit_t, and
- split connection_t into edge, or, dir, control, and base structs.
- These will save quite a bit of memory on busy servers, and they'll
- also help us track down bugs in the code and bugs in the spec.
- - Use OpenSSL's AES implementation on platforms where it's faster.
- This could save us as much as 10% CPU usage.
- o Minor features, descriptors and descriptor handling:
- - Avoid duplicate entries on MyFamily line in server descriptor.
- - When Tor receives a router descriptor that it asked for, but
- no longer wants (because it has received fresh networkstatuses
- in the meantime), do not warn the user. Cache the descriptor if
- we're a cache; drop it if we aren't.
- - Servers no longer ever list themselves in their "family" line,
- even if configured to do so. This makes it easier to configure
- family lists conveniently.
- o Minor fixes, confusing/misleading log messages:
- - Display correct results when reporting which versions are
- recommended, and how recommended they are. (Resolves bug 383.)
- - Inform the server operator when we decide not to advertise a
- DirPort due to AccountingMax enabled or a low BandwidthRate.
- - Only include function names in log messages for info/debug messages.
- For notice/warn/err, the content of the message should be clear on
- its own, and printing the function name only confuses users.
- - Remove even more protocol-related warnings from Tor server logs,
- such as bad TLS handshakes and malformed begin cells.
- - Fix bug 314: Tor clients issued "unsafe socks" warnings even
- when the IP address is mapped through MapAddress to a hostname.
- - Fix misleading log messages: an entry guard that is "unlisted",
- as well as not known to be "down" (because we've never heard
- of it), is not therefore "up".
- o Minor fixes, old/obsolete behavior:
- - Start assuming we can use a create_fast cell if we don't know
- what version a router is running.
- - We no longer look for identity and onion keys in "identity.key" and
- "onion.key" -- these were replaced by secret_id_key and
- secret_onion_key in 0.0.8pre1.
- - We no longer require unrecognized directory entries to be
- preceded by "opt".
- - Drop compatibility with obsolete Tors that permit create cells
- to have the wrong circ_id_type.
- - Remove code to special-case "-cvs" ending, since it has not
- actually mattered since 0.0.9.
- - Don't re-write the fingerprint file every restart, unless it has
- changed.
- o Minor fixes, misc client-side behavior:
- - Always remove expired routers and networkstatus docs before checking
- whether we have enough information to build circuits. (Fixes
- bug 373.)
- - When computing clock skew from directory HTTP headers, consider what
- time it was when we finished asking for the directory, not what
- time it is now.
- - Make our socks5 handling more robust to broken socks clients:
- throw out everything waiting on the buffer in between socks
- handshake phases, since they can't possibly (so the theory
- goes) have predicted what we plan to respond to them.
- - Expire socks connections if they spend too long waiting for the
- handshake to finish. Previously we would let them sit around for
- days, if the connecting application didn't close them either.
- - And if the socks handshake hasn't started, don't send a
- "DNS resolve socks failed" handshake reply; just close it.
- - If the user asks to use invalid exit nodes, be willing to use
- unstable ones.
- - Track unreachable entry guards correctly: don't conflate
- 'unreachable by us right now' with 'listed as down by the directory
- authorities'. With the old code, if a guard was unreachable by us
- but listed as running, it would clog our guard list forever.
- - Behave correctly in case we ever have a network with more than
- 2GB/s total advertised capacity.
- - Claim a commonname of Tor, rather than TOR, in TLS handshakes.
- - Fix a memory leak when we ask for "all" networkstatuses and we
- get one we don't recognize.
- Changes in version 0.1.1.26 - 2006-12-14
- o Security bugfixes:
- - Stop sending the HttpProxyAuthenticator string to directory
- servers when directory connections are tunnelled through Tor.
- - Clients no longer store bandwidth history in the state file.
- - Do not log introduction points for hidden services if SafeLogging
- is set.
- o Minor bugfixes:
- - Fix an assert failure when a directory authority sets
- AuthDirRejectUnlisted and then receives a descriptor from an
- unlisted router (reported by seeess).
- Changes in version 0.1.1.25 - 2006-11-04
- o Major bugfixes:
- - When a client asks us to resolve (rather than connect to)
- an address, and we have a cached answer, give them the cached
- answer. Previously, we would give them no answer at all.
- - We were building exactly the wrong circuits when we predict
- hidden service requirements, meaning Tor would have to build all
- its circuits on demand.
- - If none of our live entry guards have a high uptime, but we
- require a guard with a high uptime, try adding a new guard before
- we give up on the requirement. This patch should make long-lived
- connections more stable on average.
- - When testing reachability of our DirPort, don't launch new
- tests when there's already one in progress -- unreachable
- servers were stacking up dozens of testing streams.
- o Security bugfixes:
- - When the user sends a NEWNYM signal, clear the client-side DNS
- cache too. Otherwise we continue to act on previous information.
- o Minor bugfixes:
- - Avoid a memory corruption bug when creating a hash table for
- the first time.
- - Avoid possibility of controller-triggered crash when misusing
- certain commands from a v0 controller on platforms that do not
- handle printf("%s",NULL) gracefully.
- - Avoid infinite loop on unexpected controller input.
- - Don't log spurious warnings when we see a circuit close reason we
- don't recognize; it's probably just from a newer version of Tor.
- - Add Vidalia to the OS X uninstaller script, so when we uninstall
- Tor/Privoxy we also uninstall Vidalia.
- Changes in version 0.1.1.24 - 2006-09-29
- o Major bugfixes:
- - Allow really slow clients to not hang up five minutes into their
- directory downloads (suggested by Adam J. Richter).
- - Fix major performance regression from 0.1.0.x: instead of checking
- whether we have enough directory information every time we want to
- do something, only check when the directory information has changed.
- This should improve client CPU usage by 25-50%.
- - Don't crash if, after a server has been running for a while,
- it can't resolve its hostname.
- - When a client asks us to resolve (not connect to) an address,
- and we have a cached answer, give them the cached answer.
- Previously, we would give them no answer at all.
- o Minor bugfixes:
- - Allow Tor to start when RunAsDaemon is set but no logs are set.
- - Don't crash when the controller receives a third argument to an
- "extendcircuit" request.
- - Controller protocol fixes: fix encoding in "getinfo addr-mappings"
- response; fix error code when "getinfo dir/status/" fails.
- - Fix configure.in to not produce broken configure files with
- more recent versions of autoconf. Thanks to Clint for his auto*
- voodoo.
- - Fix security bug on NetBSD that could allow someone to force
- uninitialized RAM to be sent to a server's DNS resolver. This
- only affects NetBSD and other platforms that do not bounds-check
- tolower().
- - Warn user when using libevent 1.1a or earlier with win32 or kqueue
- methods: these are known to be buggy.
- - If we're a directory mirror and we ask for "all" network status
- documents, we would discard status documents from authorities
- we don't recognize.
- Changes in version 0.1.1.23 - 2006-07-30
- o Major bugfixes:
- - Fast Tor servers, especially exit nodes, were triggering asserts
- due to a bug in handling the list of pending DNS resolves. Some
- bugs still remain here; we're hunting them.
- - Entry guards could crash clients by sending unexpected input.
- - More fixes on reachability testing: if you find yourself reachable,
- then don't ever make any client requests (so you stop predicting
- circuits), then hup or have your clock jump, then later your IP
- changes, you won't think circuits are working, so you won't try to
- test reachability, so you won't publish.
- o Minor bugfixes:
- - Avoid a crash if the controller does a resetconf firewallports
- and then a setconf fascistfirewall=1.
- - Avoid an integer underflow when the dir authority decides whether
- a router is stable: we might wrongly label it stable, and compute
- a slightly wrong median stability, when a descriptor is published
- later than now.
- - Fix a place where we might trigger an assert if we can't build our
- own server descriptor yet.
- Changes in version 0.1.1.22 - 2006-07-05
- o Major bugfixes:
- - Fix a big bug that was causing servers to not find themselves
- reachable if they changed IP addresses. Since only 0.1.1.22+
- servers can do reachability testing correctly, now we automatically
- make sure to test via one of these.
- - Fix to allow clients and mirrors to learn directory info from
- descriptor downloads that get cut off partway through.
- - Directory authorities had a bug in deciding if a newly published
- descriptor was novel enough to make everybody want a copy -- a few
- servers seem to be publishing new descriptors many times a minute.
- o Minor bugfixes:
- - Fix a rare bug that was causing some servers to complain about
- "closing wedged cpuworkers" and skip some circuit create requests.
- - Make the Exit flag in directory status documents actually work.
- Changes in version 0.1.1.21 - 2006-06-10
- o Crash and assert fixes from 0.1.1.20:
- - Fix a rare crash on Tor servers that have enabled hibernation.
- - Fix a seg fault on startup for Tor networks that use only one
- directory authority.
- - Fix an assert from a race condition that occurs on Tor servers
- while exiting, where various threads are trying to log that they're
- exiting, and delete the logs, at the same time.
- - Make our unit tests pass again on certain obscure platforms.
- o Other fixes:
- - Add support for building SUSE RPM packages.
- - Speed up initial bootstrapping for clients: if we are making our
- first ever connection to any entry guard, then don't mark it down
- right after that.
- - When only one Tor server in the network is labelled as a guard,
- and we've already picked him, we would cycle endlessly picking him
- again, being unhappy about it, etc. Now we specifically exclude
- current guards when picking a new guard.
- - Servers send create cells more reliably after the TLS connection
- is established: we were sometimes forgetting to send half of them
- when we had more than one pending.
- - If we get a create cell that asks us to extend somewhere, but the
- Tor server there doesn't match the expected digest, we now send
- a destroy cell back, rather than silently doing nothing.
- - Make options->RedirectExit work again.
- - Make cookie authentication for the controller work again.
- - Stop being picky about unusual characters in the arguments to
- mapaddress. It's none of our business.
- - Add a new config option "TestVia" that lets you specify preferred
- middle hops to use for test circuits. Perhaps this will let me
- debug the reachability problems better.
- o Log / documentation fixes:
- - If we're a server and some peer has a broken TLS certificate, don't
- log about it unless ProtocolWarnings is set, i.e., we want to hear
- about protocol violations by others.
- - Fix spelling of VirtualAddrNetwork in man page.
- - Add a better explanation at the top of the autogenerated torrc file
- about what happened to our old torrc.
- Changes in version 0.1.1.20 - 2006-05-23
- o Crash and assert fixes from 0.1.0.17:
- - Fix assert bug in close_logs() on exit: when we close and delete
- logs, remove them all from the global "logfiles" list.
- - Fix an assert error when we're out of space in the connection_list
- and we try to post a hidden service descriptor (reported by Peter
- Palfrader).
- - Fix a rare assert error when we've tried all intro points for
- a hidden service and we try fetching the service descriptor again:
- "Assertion conn->state != AP_CONN_STATE_RENDDESC_WAIT failed".
- - Setconf SocksListenAddress kills Tor if it fails to bind. Now back
- out and refuse the setconf if it would fail.
- - If you specify a relative torrc path and you set RunAsDaemon in
- your torrc, then it chdir()'s to the new directory. If you then
- HUP, it tries to load the new torrc location, fails, and exits.
- The fix: no longer allow a relative path to torrc when using -f.
- - Check for integer overflows in more places, when adding elements
- to smartlists. This could possibly prevent a buffer overflow
- on malicious huge inputs.
- o Security fixes, major:
- - When we're printing strings from the network, don't try to print
- non-printable characters. Now we're safer against shell escape
- sequence exploits, and also against attacks to fool users into
- misreading their logs.
- - Implement entry guards: automatically choose a handful of entry
- nodes and stick with them for all circuits. Only pick new guards
- when the ones you have are unsuitable, and if the old guards
- become suitable again, switch back. This will increase security
- dramatically against certain end-point attacks. The EntryNodes
- config option now provides some hints about which entry guards you
- want to use most; and StrictEntryNodes means to only use those.
- Fixes CVE-2006-0414.
- - Implement exit enclaves: if we know an IP address for the
- destination, and there's a running Tor server at that address
- which allows exit to the destination, then extend the circuit to
- that exit first. This provides end-to-end encryption and end-to-end
- authentication. Also, if the user wants a .exit address or enclave,
- use 4 hops rather than 3, and cannibalize a general circ for it
- if you can.
- - Obey our firewall options more faithfully:
- . If we can't get to a dirserver directly, try going via Tor.
- . Don't ever try to connect (as a client) to a place our
- firewall options forbid.
- . If we specify a proxy and also firewall options, obey the
- firewall options even when we're using the proxy: some proxies
- can only proxy to certain destinations.
- - Make clients regenerate their keys when their IP address changes.
- - For the OS X package's modified privoxy config file, comment
- out the "logfile" line so we don't log everything passed
- through privoxy.
- - Our TLS handshakes were generating a single public/private
- keypair for the TLS context, rather than making a new one for
- each new connection. Oops. (But we were still rotating them
- periodically, so it's not so bad.)
- - When we were cannibalizing a circuit with a particular exit
- node in mind, we weren't checking to see if that exit node was
- already present earlier in the circuit. Now we are.
- - Require server descriptors to list IPv4 addresses -- hostnames
- are no longer allowed. This also fixes potential vulnerabilities
- to servers providing hostnames as their address and then
- preferentially resolving them so they can partition users.
- - Our logic to decide if the OR we connected to was the right guy
- was brittle and maybe open to a mitm for invalid routers.
- o Security fixes, minor:
- - Adjust tor-spec.txt to parameterize cell and key lengths. Now
- Ian Goldberg can prove things about our handshake protocol more
- easily.
- - Make directory authorities generate a separate "guard" flag to
- mean "would make a good entry guard". Clients now honor the
- is_guard flag rather than looking at is_fast or is_stable.
- - Try to list MyFamily elements by key, not by nickname, and warn
- if we've not heard of a server.
- - Start using RAND_bytes rather than RAND_pseudo_bytes from
- OpenSSL. Also, reseed our entropy every hour, not just at
- startup. And add entropy in 512-bit chunks, not 160-bit chunks.
- - Refuse server descriptors where the fingerprint line doesn't match
- the included identity key. Tor doesn't care, but other apps (and
- humans) might actually be trusting the fingerprint line.
- - We used to kill the circuit when we receive a relay command we
- don't recognize. Now we just drop that cell.
- - Fix a bug found by Lasse Overlier: when we were making internal
- circuits (intended to be cannibalized later for rendezvous and
- introduction circuits), we were picking them so that they had
- useful exit nodes. There was no need for this, and it actually
- aids some statistical attacks.
- - Start treating internal circuits and exit circuits separately.
- It's important to keep them separate because internal circuits
- have their last hops picked like middle hops, rather than like
- exit hops. So exiting on them will break the user's expectations.
- - Fix a possible way to DoS dirservers.
- - When the client asked for a rendezvous port that the hidden
- service didn't want to provide, we were sending an IP address
- back along with the end cell. Fortunately, it was zero. But stop
- that anyway.
- o Packaging improvements:
- - Implement --with-libevent-dir option to ./configure. Improve
- search techniques to find libevent, and use those for openssl too.
- - Fix a couple of bugs in OpenSSL detection. Deal better when
- there are multiple SSLs installed with different versions.
- - Avoid warnings about machine/limits.h on Debian GNU/kFreeBSD.
- - On non-gcc compilers (e.g. Solaris's cc), use "-g -O" instead of
- "-Wall -g -O2".
- - Make unit tests (and other invocations that aren't the real Tor)
- run without launching listeners, creating subdirectories, and so on.
- - The OS X installer was adding a symlink for tor_resolve but
- the binary was called tor-resolve (reported by Thomas Hardly).
- - Now we can target arch and OS in rpm builds (contributed by
- Phobos). Also make the resulting dist-rpm filename match the
- target arch.
- - Apply Matt Ghali's --with-syslog-facility patch to ./configure
- if you log to syslog and want something other than LOG_DAEMON.
- - Fix the torify (tsocks) config file to not use Tor for localhost
- connections.
- - Start shipping socks-extensions.txt, tor-doc-unix.html,
- tor-doc-server.html, and stylesheet.css in the tarball.
- - Stop shipping tor-doc.html, INSTALL, and README in the tarball.
- They are useless now.
- - Add Peter Palfrader's contributed check-tor script. It lets you
- easily check whether a given server (referenced by nickname)
- is reachable by you.
- - Add BSD-style contributed startup script "rc.subr" from Peter
- Thoenen.
- o Directory improvements -- new directory protocol:
- - See tor/doc/dir-spec.txt for all the juicy details. Key points:
- - Authorities and caches publish individual descriptors (by
- digest, by fingerprint, by "all", and by "tell me yours").
- - Clients don't download or use the old directory anymore. Now they
- download network-statuses from the directory authorities, and
- fetch individual server descriptors as needed from mirrors.
- - Clients don't download descriptors of non-running servers.
- - Download descriptors by digest, not by fingerprint. Caches try to
- download all listed digests from authorities; clients try to
- download "best" digests from caches. This avoids partitioning
- and isolating attacks better.
- - Only upload a new server descriptor when options change, 18
- hours have passed, uptime is reset, or bandwidth changes a lot.
- - Directory authorities silently throw away new descriptors that
- haven't changed much if the timestamps are similar. We do this to
- tolerate older Tor servers that upload a new descriptor every 15
- minutes. (It seemed like a good idea at the time.)
- - Clients choose directory servers from the network status lists,
- not from their internal list of router descriptors. Now they can
- go to caches directly rather than needing to go to authorities
- to bootstrap the first set of descriptors.
- - When picking a random directory, prefer non-authorities if any
- are known.
- - Add a new flag to network-status indicating whether the server
- can answer v2 directory requests too.
- - Directory mirrors now cache up to 16 unrecognized network-status
- docs, so new directory authorities will be cached too.
- - Stop parsing, storing, or using running-routers output (but
- mirrors still cache and serve it).
- - Clients consider a threshold of "versioning" directory authorities
- before deciding whether to warn the user that he's obsolete.
- - Authorities publish separate sorted lists of recommended versions
- for clients and for servers.
- - Change DirServers config line to note which dirs are v1 authorities.
- - Put nicknames on the DirServer line, so we can refer to them
- without requiring all our users to memorize their IP addresses.
- - Remove option when getting directory cache to see whether they
- support running-routers; they all do now. Replace it with one
- to see whether caches support v2 stuff.
- - Stop listing down or invalid nodes in the v1 directory. This
- reduces its bulk by about 1/3, and reduces load on mirrors.
- - Mirrors no longer cache the v1 directory as often.
- - If we as a directory mirror don't know of any v1 directory
- authorities, then don't try to cache any v1 directories.
- o Other directory improvements:
- - Add lefkada.eecs.harvard.edu and tor.dizum.com as fourth and
- fifth authoritative directory servers.
- - Directory authorities no longer require an open connection from
- a server to consider him "reachable". We need this change because
- when we add new directory authorities, old servers won't know not
- to hang up on them.
- - Dir authorities now do their own external reachability testing
- of each server, and only list as running the ones they found to
- be reachable. We also send back warnings to the server's logs if
- it uploads a descriptor that we already believe is unreachable.
- - Spread the directory authorities' reachability testing over the
- entire testing interval, so we don't try to do 500 TLS's at once
- every 20 minutes.
- - Make the "stable" router flag in network-status be the median of
- the uptimes of running valid servers, and make clients pay
- attention to the network-status flags. Thus the cutoff adapts
- to the stability of the network as a whole, making IRC, IM, etc
- connections more reliable.
- - Make the v2 dir's "Fast" flag based on relative capacity, just
- like "Stable" is based on median uptime. Name everything in the
- top 7/8 Fast, and only the top 1/2 gets to be a Guard.
- - Retry directory requests if we fail to get an answer we like
- from a given dirserver (we were retrying before, but only if
- we fail to connect).
- - Return a robots.txt on our dirport to discourage google indexing.
- o Controller protocol improvements:
- - Revised controller protocol (version 1) that uses ascii rather
- than binary: tor/doc/control-spec.txt. Add supporting libraries
- in python and java and c# so you can use the controller from your
- applications without caring how our protocol works.
- - Allow the DEBUG controller event to work again. Mark certain log
- entries as "don't tell this to controllers", so we avoid cycles.
- - New controller function "getinfo accounting", to ask how
- many bytes we've used in this time period.
- - Add a "resetconf" command so you can set config options like
- AllowUnverifiedNodes and LongLivedPorts to "". Also, if you give
- a config option in the torrc with no value, then it clears it
- entirely (rather than setting it to its default).
- - Add a "getinfo config-file" to tell us where torrc is. Also
- expose guard nodes, config options/names.
- - Add a "quit" command (when when using the controller manually).
- - Add a new signal "newnym" to "change pseudonyms" -- that is, to
- stop using any currently-dirty circuits for new streams, so we
- don't link new actions to old actions. This also occurs on HUP
- or "signal reload".
- - If we would close a stream early (e.g. it asks for a .exit that
- we know would refuse it) but the LeaveStreamsUnattached config
- option is set by the controller, then don't close it.
- - Add a new controller event type "authdir_newdescs" that allows
- controllers to get all server descriptors that were uploaded to
- a router in its role as directory authority.
- - New controller option "getinfo desc/all-recent" to fetch the
- latest server descriptor for every router that Tor knows about.
- - Fix the controller's "attachstream 0" command to treat conn like
- it just connected, doing address remapping, handling .exit and
- .onion idioms, and so on. Now we're more uniform in making sure
- that the controller hears about new and closing connections.
- - Permit transitioning from ORPort==0 to ORPort!=0, and back, from
- the controller. Also, rotate dns and cpu workers if the controller
- changes options that will affect them; and initialize the dns
- worker cache tree whether or not we start out as a server.
- - Add a new circuit purpose 'controller' to let the controller ask
- for a circuit that Tor won't try to use. Extend the "extendcircuit"
- controller command to let you specify the purpose if you're starting
- a new circuit. Add a new "setcircuitpurpose" controller command to
- let you change a circuit's purpose after it's been created.
- - Let the controller ask for "getinfo dir/server/foo" so it can ask
- directly rather than connecting to the dir port. "getinfo
- dir/status/foo" also works, but currently only if your DirPort
- is enabled.
- - Let the controller tell us about certain router descriptors
- that it doesn't want Tor to use in circuits. Implement
- "setrouterpurpose" and modify "+postdescriptor" to do this.
- - If the controller's *setconf commands fail, collect an error
- message in a string and hand it back to the controller -- don't
- just tell them to go read their logs.
- o Scalability, resource management, and performance:
- - Fix a major load balance bug: we were round-robin reading in 16 KB
- chunks, and servers with bandwidthrate of 20 KB, while downloading
- a 600 KB directory, would starve their other connections. Now we
- try to be a bit more fair.
- - Be more conservative about whether to advertise our DirPort.
- The main change is to not advertise if we're running at capacity
- and either a) we could hibernate ever or b) our capacity is low
- and we're using a default DirPort.
- - We weren't cannibalizing circuits correctly for
- CIRCUIT_PURPOSE_C_ESTABLISH_REND and
- CIRCUIT_PURPOSE_S_ESTABLISH_INTRO, so we were being forced to
- build those from scratch. This should make hidden services faster.
- - Predict required circuits better, with an eye toward making hidden
- services faster on the service end.
- - Compress exit policies even more: look for duplicate lines and
- remove them.
- - Generate 18.0.0.0/8 address policy format in descs when we can;
- warn when the mask is not reducible to a bit-prefix.
- - There used to be two ways to specify your listening ports in a
- server descriptor: on the "router" line and with a separate "ports"
- line. Remove support for the "ports" line.
- - Reduce memory requirements in our structs by changing the order
- of fields. Replace balanced trees with hash tables. Inline
- bottleneck smartlist functions. Add a "Map from digest to void*"
- abstraction so we can do less hex encoding/decoding, and use it
- in router_get_by_digest(). Many other CPU and memory improvements.
- - Allow tor_gzip_uncompress to extract as much as possible from
- truncated compressed data. Try to extract as many
- descriptors as possible from truncated http responses (when
- purpose is DIR_PURPOSE_FETCH_ROUTERDESC).
- - Make circ->onionskin a pointer, not a static array. moria2 was using
- 125000 circuit_t's after it had been up for a few weeks, which
- translates to 20+ megs of wasted space.
- - The private half of our EDH handshake keys are now chosen out
- of 320 bits, not 1024 bits. (Suggested by Ian Goldberg.)
- - Stop doing the complex voodoo overkill checking for insecure
- Diffie-Hellman keys. Just check if it's in [2,p-2] and be happy.
- - Do round-robin writes for TLS of at most 16 kB per write. This
- might be more fair on loaded Tor servers.
- - Do not use unaligned memory access on alpha, mips, or mipsel.
- It *works*, but is very slow, so we treat them as if it doesn't.
- o Other bugfixes and improvements:
- - Start storing useful information to $DATADIR/state, so we can
- remember things across invocations of Tor. Retain unrecognized
- lines so we can be forward-compatible, and write a TorVersion line
- so we can be backward-compatible.
- - If ORPort is set, Address is not explicitly set, and our hostname
- resolves to a private IP address, try to use an interface address
- if it has a public address. Now Windows machines that think of
- themselves as localhost can guess their address.
- - Regenerate our local descriptor if it's dirty and we try to use
- it locally (e.g. if it changes during reachability detection).
- This was causing some Tor servers to keep publishing the same
- initial descriptor forever.
- - Tor servers with dynamic IP addresses were needing to wait 18
- hours before they could start doing reachability testing using
- the new IP address and ports. This is because they were using
- the internal descriptor to learn what to test, yet they were only
- rebuilding the descriptor once they decided they were reachable.
- - It turns out we couldn't bootstrap a network since we added
- reachability detection in 0.1.0.1-rc. Good thing the Tor network
- has never gone down. Add an AssumeReachable config option to let
- servers and authorities bootstrap. When we're trying to build a
- high-uptime or high-bandwidth circuit but there aren't enough
- suitable servers, try being less picky rather than simply failing.
- - Newly bootstrapped Tor networks couldn't establish hidden service
- circuits until they had nodes with high uptime. Be more tolerant.
- - Really busy servers were keeping enough circuits open on stable
- connections that they were wrapping around the circuit_id
- space. (It's only two bytes.) This exposed a bug where we would
- feel free to reuse a circuit_id even if it still exists but has
- been marked for close. Try to fix this bug. Some bug remains.
- - When we fail to bind or listen on an incoming or outgoing
- socket, we now close it before refusing, rather than just
- leaking it. (Thanks to Peter Palfrader for finding.)
- - Fix a file descriptor leak in start_daemon().
- - On Windows, you can't always reopen a port right after you've
- closed it. So change retry_listeners() to only close and re-open
- ports that have changed.
- - Workaround a problem with some http proxies that refuse GET
- requests that specify "Content-Length: 0". Reported by Adrian.
- - Recover better from TCP connections to Tor servers that are
- broken but don't tell you (it happens!); and rotate TLS
- connections once a week.
- - Fix a scary-looking but apparently harmless bug where circuits
- would sometimes start out in state CIRCUIT_STATE_OR_WAIT at
- servers, and never switch to state CIRCUIT_STATE_OPEN.
- - Check for even more Windows version flags when writing the platform
- string in server descriptors, and note any we don't recognize.
- - Add reasons to DESTROY and RELAY_TRUNCATED cells, so clients can
- get a better idea of why their circuits failed. Not used yet.
- - Add TTLs to RESOLVED, CONNECTED, and END_REASON_EXITPOLICY cells.
- We don't use them yet, but maybe one day our DNS resolver will be
- able to discover them.
- - Let people type "tor --install" as well as "tor -install" when they
- want to make it an NT service.
- - Looks like we were never delivering deflated (i.e. compressed)
- running-routers lists, even when asked. Oops.
- - We were leaking some memory every time the client changed IPs.
- - Clean up more of the OpenSSL memory when exiting, so we can detect
- memory leaks better.
- - Never call free() on tor_malloc()d memory. This will help us
- use dmalloc to detect memory leaks.
- - Some Tor servers process billions of cells per day. These
- statistics are now uint64_t's.
- - Check [X-]Forwarded-For headers in HTTP requests when generating
- log messages. This lets people run dirservers (and caches) behind
- Apache but still know which IP addresses are causing warnings.
- - Fix minor integer overflow in calculating when we expect to use up
- our bandwidth allocation before hibernating.
- - Lower the minimum required number of file descriptors to 1000,
- so we can have some overhead for Valgrind on Linux, where the
- default ulimit -n is 1024.
- - Stop writing the "router.desc" file, ever. Nothing uses it anymore,
- and its existence is confusing some users.
- o Config option fixes:
- - Add a new config option ExitPolicyRejectPrivate which defaults
- to on. Now all exit policies will begin with rejecting private
- addresses, unless the server operator explicitly turns it off.
- - Bump the default bandwidthrate to 3 MB, and burst to 6 MB.
- - Add new ReachableORAddresses and ReachableDirAddresses options
- that understand address policies. FascistFirewall is now a synonym
- for "ReachableORAddresses *:443", "ReachableDirAddresses *:80".
- - Start calling it FooListenAddress rather than FooBindAddress,
- since few of our users know what it means to bind an address
- or port.
- - If the user gave Tor an odd number of command-line arguments,
- we were silently ignoring the last one. Now we complain and fail.
- This wins the oldest-bug prize -- this bug has been present since
- November 2002, as released in Tor 0.0.0.
- - If you write "HiddenServicePort 6667 127.0.0.1 6668" in your
- torrc rather than "HiddenServicePort 6667 127.0.0.1:6668",
- it would silently ignore the 6668.
- - If we get a linelist or linelist_s config option from the torrc,
- e.g. ExitPolicy, and it has no value, warn and skip rather than
- silently resetting it to its default.
- - Setconf was appending items to linelists, not clearing them.
- - Add MyFamily to torrc.sample in the server section, so operators
- will be more likely to learn that it exists.
- - Make ContactInfo mandatory for authoritative directory servers.
- - MaxConn has been obsolete for a while now. Document the ConnLimit
- config option, which is a *minimum* number of file descriptors
- that must be available else Tor refuses to start.
- - Get rid of IgnoreVersion undocumented config option, and make us
- only warn, never exit, when we're running an obsolete version.
- - Make MonthlyAccountingStart config option truly obsolete now.
- - Correct the man page entry on TrackHostExitsExpire.
- - Let directory authorities start even if they don't specify an
- Address config option.
- - Change "AllowUnverifiedNodes" to "AllowInvalidNodes", to
- reflect the updated flags in our v2 dir protocol.
- o Config option features:
- - Add a new config option FastFirstHopPK (on by default) so clients
- do a trivial crypto handshake for their first hop, since TLS has
- already taken care of confidentiality and authentication.
- - Let the user set ControlListenAddress in the torrc. This can be
- dangerous, but there are some cases (like a secured LAN) where it
- makes sense.
- - New config options to help controllers: FetchServerDescriptors
- and FetchHidServDescriptors for whether to fetch server
- info and hidserv info or let the controller do it, and
- PublishServerDescriptor and PublishHidServDescriptors.
- - Also let the controller set the __AllDirActionsPrivate config
- option if you want all directory fetches/publishes to happen via
- Tor (it assumes your controller bootstraps your circuits).
- - Add "HardwareAccel" config option: support for crypto hardware
- accelerators via OpenSSL. Off by default, until we find somebody
- smart who can test it for us. (It appears to produce seg faults
- in at least some cases.)
- - New config option "AuthDirRejectUnlisted" for directory authorities
- as a panic button: if we get flooded with unusable servers we can
- revert to only listing servers in the approved-routers file.
- - Directory authorities can now reject/invalidate by key and IP,
- with the config options "AuthDirInvalid" and "AuthDirReject", or
- by marking a fingerprint as "!reject" or "!invalid" (as its
- nickname) in the approved-routers file. This is useful since
- currently we automatically list servers as running and usable
- even if we know they're jerks.
- - Add a new config option TestSocks so people can see whether their
- applications are using socks4, socks4a, socks5-with-ip, or
- socks5-with-fqdn. This way they don't have to keep mucking
- with tcpdump and wondering if something got cached somewhere.
- - Add "private:*" as an alias in configuration for policies. Now
- you can simplify your exit policy rather than needing to list
- every single internal or nonroutable network space.
- - Accept "private:*" in routerdesc exit policies; not generated yet
- because older Tors do not understand it.
- - Add configuration option "V1AuthoritativeDirectory 1" which
- moria1, moria2, and tor26 have set.
- - Implement an option, VirtualAddrMask, to set which addresses
- get handed out in response to mapaddress requests. This works
- around a bug in tsocks where 127.0.0.0/8 is never socksified.
- - Add a new config option FetchUselessDescriptors, off by default,
- for when you plan to run "exitlist" on your client and you want
- to know about even the non-running descriptors.
- - SocksTimeout: How long do we let a socks connection wait
- unattached before we fail it?
- - CircuitBuildTimeout: Cull non-open circuits that were born
- at least this many seconds ago.
- - CircuitIdleTimeout: Cull open clean circuits that were born
- at least this many seconds ago.
- - New config option SafeSocks to reject all application connections
- using unsafe socks protocols. Defaults to off.
- o Improved and clearer log messages:
- - Reduce clutter in server logs. We're going to try to make
- them actually usable now. New config option ProtocolWarnings that
- lets you hear about how _other Tors_ are breaking the protocol. Off
- by default.
- - Divide log messages into logging domains. Once we put some sort
- of interface on this, it will let people looking at more verbose
- log levels specify the topics they want to hear more about.
- - Log server fingerprint on startup, so new server operators don't
- have to go hunting around their filesystem for it.
- - Provide dire warnings to any users who set DirServer manually;
- move it out of torrc.sample and into torrc.complete.
- - Make the log message less scary when all the dirservers are
- temporarily unreachable.
- - When tor_socketpair() fails in Windows, give a reasonable
- Windows-style errno back.
- - Improve tor_gettimeofday() granularity on windows.
- - We were printing the number of idle dns workers incorrectly when
- culling them.
- - Handle duplicate lines in approved-routers files without warning.
- - We were whining about using socks4 or socks5-with-local-lookup
- even when it's an IP address in the "virtual" range we designed
- exactly for this case.
- - Check for named servers when looking them up by nickname;
- warn when we're calling a non-named server by its nickname;
- don't warn twice about the same name.
- - Downgrade the dirserver log messages when whining about
- unreachability.
- - Correct "your server is reachable" log entries to indicate that
- it was self-testing that told us so.
- - If we're trying to be a Tor server and running Windows 95/98/ME
- as a server, explain that we'll likely crash.
- - Provide a more useful warn message when our onion queue gets full:
- the CPU is too slow or the exit policy is too liberal.
- - Don't warn when we receive a 503 from a dirserver/cache -- this
- will pave the way for them being able to refuse if they're busy.
- - When we fail to bind a listener, try to provide a more useful
- log message: e.g., "Is Tor already running?"
- - Only start testing reachability once we've established a
- circuit. This will make startup on dir authorities less noisy.
- - Don't try to upload hidden service descriptors until we have
- established a circuit.
- - Tor didn't warn when it failed to open a log file.
- - Warn when listening on a public address for socks. We suspect a
- lot of people are setting themselves up as open socks proxies,
- and they have no idea that jerks on the Internet are using them,
- since they simply proxy the traffic into the Tor network.
- - Give a useful message when people run Tor as the wrong user,
- rather than telling them to start chowning random directories.
- - Fix a harmless bug that was causing Tor servers to log
- "Got an end because of misc error, but we're not an AP. Closing."
- - Fix wrong log message when you add a "HiddenServiceNodes" config
- line without any HiddenServiceDir line (reported by Chris Thomas).
- - Directory authorities now stop whining so loudly about bad
- descriptors that they fetch from other dirservers. So when there's
- a log complaint, it's for sure from a freshly uploaded descriptor.
- - When logging via syslog, include the pid whenever we provide
- a log entry. Suggested by Todd Fries.
- - When we're shutting down and we do something like try to post a
- server descriptor or rendezvous descriptor, don't complain that
- we seem to be unreachable. Of course we are, we're shutting down.
- - Change log line for unreachability to explicitly suggest /etc/hosts
- as the culprit. Also make it clearer what IP address and ports we're
- testing for reachability.
- - Put quotes around user-supplied strings when logging so users are
- more likely to realize if they add bad characters (like quotes)
- to the torrc.
- - NT service patch from Matt Edman to improve error messages on Win32.
- Changes in version 0.1.0.17 - 2006-02-17
- o Crash bugfixes on 0.1.0.x:
- - When servers with a non-zero DirPort came out of hibernation,
- sometimes they would trigger an assert.
- o Other important bugfixes:
- - On platforms that don't have getrlimit (like Windows), we were
- artificially constraining ourselves to a max of 1024
- connections. Now just assume that we can handle as many as 15000
- connections. Hopefully this won't cause other problems.
- o Backported features:
- - When we're a server, a client asks for an old-style directory,
- and our write bucket is empty, don't give it to him. This way
- small servers can continue to serve the directory *sometimes*,
- without getting overloaded.
- - Whenever you get a 503 in response to a directory fetch, try
- once more. This will become important once servers start sending
- 503's whenever they feel busy.
- - Fetch a new directory every 120 minutes, not every 40 minutes.
- Now that we have hundreds of thousands of users running the old
- directory algorithm, it's starting to hurt a lot.
- - Bump up the period for forcing a hidden service descriptor upload
- from 20 minutes to 1 hour.
- Changes in version 0.1.0.16 - 2006-01-02
- o Crash bugfixes on 0.1.0.x:
- - On Windows, build with a libevent patch from "I-M Weasel" to avoid
- corrupting the heap, losing FDs, or crashing when we need to resize
- the fd_sets. (This affects the Win32 binaries, not Tor's sources.)
- - It turns out sparc64 platforms crash on unaligned memory access
- too -- so detect and avoid this.
- - Handle truncated compressed data correctly (by detecting it and
- giving an error).
- - Fix possible-but-unlikely free(NULL) in control.c.
- - When we were closing connections, there was a rare case that
- stomped on memory, triggering seg faults and asserts.
- - Avoid potential infinite recursion when building a descriptor. (We
- don't know that it ever happened, but better to fix it anyway.)
- - We were neglecting to unlink marked circuits from soon-to-close OR
- connections, which caused some rare scribbling on freed memory.
- - Fix a memory stomping race bug when closing the joining point of two
- rendezvous circuits.
- - Fix an assert in time parsing found by Steven Murdoch.
- o Other bugfixes on 0.1.0.x:
- - When we're doing reachability testing, provide more useful log
- messages so the operator knows what to expect.
- - Do not check whether DirPort is reachable when we are suppressing
- advertising it because of hibernation.
- - When building with -static or on Solaris, we sometimes needed -ldl.
- - One of the dirservers (tor26) changed its IP address.
- - When we're deciding whether a stream has enough circuits around
- that can handle it, count the freshly dirty ones and not the ones
- that are so dirty they won't be able to handle it.
- - When we're expiring old circuits, we had a logic error that caused
- us to close new rendezvous circuits rather than old ones.
- - Give a more helpful log message when you try to change ORPort via
- the controller: you should upgrade Tor if you want that to work.
- - We were failing to parse Tor versions that start with "Tor ".
- - Tolerate faulty streams better: when a stream fails for reason
- exitpolicy, stop assuming that the router is lying about his exit
- policy. When a stream fails for reason misc, allow it to retry just
- as if it was resolvefailed. When a stream has failed three times,
- reset its failure count so we can try again and get all three tries.
- Changes in version 0.1.0.15 - 2005-09-23
- o Bugfixes on 0.1.0.x:
- - Reject ports 465 and 587 (spam targets) in default exit policy.
- - Don't crash when we don't have any spare file descriptors and we
- try to spawn a dns or cpu worker.
- - Get rid of IgnoreVersion undocumented config option, and make us
- only warn, never exit, when we're running an obsolete version.
- - Don't try to print a null string when your server finds itself to
- be unreachable and the Address config option is empty.
- - Make the numbers in read-history and write-history into uint64s,
- so they don't overflow and publish negatives in the descriptor.
- - Fix a minor memory leak in smartlist_string_remove().
- - We were only allowing ourselves to upload a server descriptor at
- most every 20 minutes, even if it changed earlier than that.
- - Clean up log entries that pointed to old URLs.
- Changes in version 0.1.0.14 - 2005-08-08
- o Bugfixes on 0.1.0.x:
- - Fix the other half of the bug with crypto handshakes
- (CVE-2005-2643).
- - Fix an assert trigger if you send a 'signal term' via the
- controller when it's listening for 'event info' messages.
- Changes in version 0.1.0.13 - 2005-08-04
- o Bugfixes on 0.1.0.x:
- - Fix a critical bug in the security of our crypto handshakes.
- - Fix a size_t underflow in smartlist_join_strings2() that made
- it do bad things when you hand it an empty smartlist.
- - Fix Windows installer to ship Tor license (thanks to Aphex for
- pointing out this oversight) and put a link to the doc directory
- in the start menu.
- - Explicitly set no-unaligned-access for sparc: it turns out the
- new gcc's let you compile broken code, but that doesn't make it
- not-broken.
- Changes in version 0.1.0.12 - 2005-07-18
- o New directory servers:
- - tor26 has changed IP address.
- o Bugfixes on 0.1.0.x:
- - Fix a possible double-free in tor_gzip_uncompress().
- - When --disable-threads is set, do not search for or link against
- pthreads libraries.
- - Don't trigger an assert if an authoritative directory server
- claims its dirport is 0.
- - Fix bug with removing Tor as an NT service: some people were
- getting "The service did not return an error." Thanks to Matt
- Edman for the fix.
- Changes in version 0.1.0.11 - 2005-06-30
- o Bugfixes on 0.1.0.x:
- - Fix major security bug: servers were disregarding their
- exit policies if clients behaved unexpectedly.
- - Make OS X init script check for missing argument, so we don't
- confuse users who invoke it incorrectly.
- - Fix a seg fault in "tor --hash-password foo".
- - The MAPADDRESS control command was broken.
- Changes in version 0.1.0.10 - 2005-06-14
- o Fixes on Win32:
- - Make NT services work and start on startup on Win32 (based on
- patch by Matt Edman). See the FAQ entry for details.
- - Make 'platform' string in descriptor more accurate for Win32
- servers, so it's not just "unknown platform".
- - REUSEADDR on normal platforms means you can rebind to the port
- right after somebody else has let it go. But REUSEADDR on Win32
- means you can bind to the port _even when somebody else already
- has it bound_! So, don't do that on Win32.
- - Clean up the log messages when starting on Win32 with no config
- file.
- - Allow seeding the RNG on Win32 even when you're not running as
- Administrator. If seeding the RNG on Win32 fails, quit.
- o Assert / crash bugs:
- - Refuse relay cells that claim to have a length larger than the
- maximum allowed. This prevents a potential attack that could read
- arbitrary memory (e.g. keys) from an exit server's process
- (CVE-2005-2050).
- - If unofficial Tor clients connect and send weird TLS certs, our
- Tor server triggers an assert. Stop asserting, and start handling
- TLS errors better in other situations too.
- - Fix a race condition that can trigger an assert when we have a
- pending create cell and an OR connection attempt fails.
- o Resource leaks:
- - Use pthreads for worker processes rather than forking. This was
- forced because when we forked, we ended up wasting a lot of
- duplicate ram over time.
- - Also switch to foo_r versions of some library calls to allow
- reentry and threadsafeness.
- - Implement --disable-threads configure option. Disable threads on
- netbsd and openbsd by default, because they have no reentrant
- resolver functions (!), and on solaris since it has other
- threading issues.
- - Fix possible bug on threading platforms (e.g. win32) which was
- leaking a file descriptor whenever a cpuworker or dnsworker died.
- - Fix a minor memory leak when somebody establishes an introduction
- point at your Tor server.
- - Fix possible memory leak in tor_lookup_hostname(). (Thanks to
- Adam Langley.)
- - Add ./configure --with-dmalloc option, to track memory leaks.
- - And try to free all memory on closing, so we can detect what
- we're leaking.
- o Protocol correctness:
- - When we've connected to an OR and handshaked but didn't like
- the result, we were closing the conn without sending destroy
- cells back for pending circuits. Now send those destroys.
- - Start sending 'truncated' cells back rather than destroy cells
- if the circuit closes in front of you. This means we won't have
- to abandon partially built circuits.
- - Handle changed router status correctly when dirserver reloads
- fingerprint file. We used to be dropping all unverified descriptors
- right then. The bug was hidden because we would immediately
- fetch a directory from another dirserver, which would include the
- descriptors we just dropped.
- - Revise tor-spec to add more/better stream end reasons.
- - Revise all calls to connection_edge_end to avoid sending 'misc',
- and to take errno into account where possible.
- - Client now retries when streams end early for 'hibernating' or
- 'resource limit' reasons, rather than failing them.
- - Try to be more zealous about calling connection_edge_end when
- things go bad with edge conns in connection.c.
- o Robustness improvements:
- - Better handling for heterogeneous / unreliable nodes:
- - Annotate circuits with whether they aim to contain high uptime
- nodes and/or high capacity nodes. When building circuits, choose
- appropriate nodes.
- - This means that every single node in an intro rend circuit,
- not just the last one, will have a minimum uptime.
- - New config option LongLivedPorts to indicate application streams
- that will want high uptime circuits.
- - Servers reset uptime when a dir fetch entirely fails. This
- hopefully reflects stability of the server's network connectivity.
- - If somebody starts his tor server in Jan 2004 and then fixes his
- clock, don't make his published uptime be a year.
- - Reset published uptime when we wake up from hibernation.
- - Introduce a notion of 'internal' circs, which are chosen without
- regard to the exit policy of the last hop. Intro and rendezvous
- circs must be internal circs, to avoid leaking information. Resolve
- and connect streams can use internal circs if they want.
- - New circuit pooling algorithm: keep track of what destination ports
- we've used recently (start out assuming we'll want to use 80), and
- make sure to have enough circs around to satisfy these ports. Also
- make sure to have 2 internal circs around if we've required internal
- circs lately (and with high uptime if we've seen that lately too).
- - Turn addr_policy_compare from a tristate to a quadstate; this should
- help address our "Ah, you allow 1.2.3.4:80. You are a good choice
- for google.com" problem.
- - When a client asks us for a dir mirror and we don't have one,
- launch an attempt to get a fresh one.
- - First cut at support for "create-fast" cells. Clients can use
- these when extending to their first hop, since the TLS already
- provides forward secrecy and authentication. Not enabled on
- clients yet.
- o Reachability testing.
- - Your Tor server will automatically try to see if its ORPort and
- DirPort are reachable from the outside, and it won't upload its
- descriptor until it decides at least ORPort is reachable (when
- DirPort is not yet found reachable, publish it as zero).
- - When building testing circs for ORPort testing, use only
- high-bandwidth nodes, so fewer circuits fail.
- - Notice when our IP changes, and reset stats/uptime/reachability.
- - Authdirservers don't do ORPort reachability detection, since
- they're in clique mode, so it will be rare to find a server not
- already connected to them.
- - Authdirservers now automatically approve nodes running 0.1.0.2-rc
- or later.
- o Dirserver fixes:
- - Now we allow two unverified servers with the same nickname
- but different keys. But if a nickname is verified, only that
- nickname+key are allowed.
- - If you're an authdirserver connecting to an address:port,
- and it's not the OR you were expecting, forget about that
- descriptor. If he *was* the one you were expecting, then forget
- about all other descriptors for that address:port.
- - Allow servers to publish descriptors from 12 hours in the future.
- Corollary: only whine about clock skew from the dirserver if
- he's a trusted dirserver (since now even verified servers could
- have quite wrong clocks).
- - Require servers that use the default dirservers to have public IP
- addresses. We have too many servers that are configured with private
- IPs and their admins never notice the log entries complaining that
- their descriptors are being rejected.
- o Efficiency improvements:
- - Use libevent. Now we can use faster async cores (like epoll, kpoll,
- and /dev/poll), and hopefully work better on Windows too.
- - Apple's OS X 10.4.0 ships with a broken kqueue API, and using
- kqueue on 10.3.9 causes kernel panics. Don't use kqueue on OS X.
- - Find libevent even if it's hiding in /usr/local/ and your
- CFLAGS and LDFLAGS don't tell you to look there.
- - Be able to link with libevent as a shared library (the default
- after 1.0d), even if it's hiding in /usr/local/lib and even
- if you haven't added /usr/local/lib to your /etc/ld.so.conf,
- assuming you're running gcc. Otherwise fail and give a useful
- error message.
- - Switch to a new buffer management algorithm, which tries to avoid
- reallocing and copying quite as much. In first tests it looks like
- it uses *more* memory on average, but less cpu.
- - Switch our internal buffers implementation to use a ring buffer,
- to hopefully improve performance for fast servers a lot.
- - Reenable the part of the code that tries to flush as soon as an
- OR outbuf has a full TLS record available. Perhaps this will make
- OR outbufs not grow as huge except in rare cases, thus saving lots
- of CPU time plus memory.
- - Improve performance for dirservers: stop re-parsing the whole
- directory every time you regenerate it.
- - Keep a big splay tree of (circid,orconn)->circuit mappings to make
- it much faster to look up a circuit for each relay cell.
- - Remove most calls to assert_all_pending_dns_resolves_ok(),
- since they're eating our cpu on exit nodes.
- - Stop wasting time doing a case insensitive comparison for every
- dns name every time we do any lookup. Canonicalize the names to
- lowercase when you first see them.
- o Hidden services:
- - Handle unavailable hidden services better. Handle slow or busy
- hidden services better.
- - Cannibalize GENERAL circs to be C_REND, C_INTRO, S_INTRO, and S_REND
- circ as necessary, if there are any completed ones lying around
- when we try to launch one.
- - Make hidden services try to establish a rendezvous for 30 seconds
- after fetching the descriptor, rather than for n (where n=3)
- attempts to build a circuit.
- - Adjust maximum skew and age for rendezvous descriptors: let skew
- be 48 hours rather than 90 minutes.
- - Reject malformed .onion addresses rather then passing them on as
- normal web requests.
- o Controller:
- - More Tor controller support. See
- http://tor.eff.org/doc/control-spec.txt for all the new features,
- including signals to emulate unix signals from any platform;
- redirectstream; extendcircuit; mapaddress; getinfo; postdescriptor;
- closestream; closecircuit; etc.
- - Encode hashed controller passwords in hex instead of base64,
- to make it easier to write controllers.
- - Revise control spec and implementation to allow all log messages to
- be sent to controller with their severities intact (suggested by
- Matt Edman). Disable debug-level logs while delivering a debug-level
- log to the controller, to prevent loop. Update TorControl to handle
- new log event types.
- o New config options/defaults:
- - Begin scrubbing sensitive strings from logs by default. Turn off
- the config option SafeLogging if you need to do debugging.
- - New exit policy: accept most low-numbered ports, rather than
- rejecting most low-numbered ports.
- - Put a note in the torrc about abuse potential with the default
- exit policy.
- - Add support for CONNECTing through https proxies, with "HttpsProxy"
- config option.
- - Add HttpProxyAuthenticator and HttpsProxyAuthenticator support
- based on patch from Adam Langley (basic auth only).
- - Bump the default BandwidthRate from 1 MB to 2 MB, to accommodate
- the fast servers that have been joining lately. (Clients are now
- willing to load balance over up to 2 MB of advertised bandwidth
- capacity too.)
- - New config option MaxAdvertisedBandwidth which lets you advertise
- a low bandwidthrate (to not attract as many circuits) while still
- allowing a higher bandwidthrate in reality.
- - Require BandwidthRate to be at least 20kB/s for servers.
- - Add a NoPublish config option, so you can be a server (e.g. for
- testing running Tor servers in other Tor networks) without
- publishing your descriptor to the primary dirservers.
- - Add a new AddressMap config directive to rewrite incoming socks
- addresses. This lets you, for example, declare an implicit
- required exit node for certain sites.
- - Add a new TrackHostExits config directive to trigger addressmaps
- for certain incoming socks addresses -- for sites that break when
- your exit keeps changing (based on patch from Mike Perry).
- - Split NewCircuitPeriod option into NewCircuitPeriod (30 secs),
- which describes how often we retry making new circuits if current
- ones are dirty, and MaxCircuitDirtiness (10 mins), which describes
- how long we're willing to make use of an already-dirty circuit.
- - Change compiled-in SHUTDOWN_WAIT_LENGTH from a fixed 30 secs to
- a config option "ShutdownWaitLength" (when using kill -INT on
- servers).
- - Fix an edge case in parsing config options: if they say "--"
- on the commandline, it's not a config option (thanks weasel).
- - New config option DirAllowPrivateAddresses for authdirservers.
- Now by default they refuse router descriptors that have non-IP or
- private-IP addresses.
- - Change DirFetchPeriod/StatusFetchPeriod to have a special "Be
- smart" default value: low for servers and high for clients.
- - Some people were putting "Address " in their torrc, and they had
- a buggy resolver that resolved " " to 0.0.0.0. Oops.
- - If DataDir is ~/.tor, and that expands to /.tor, then default to
- LOCALSTATEDIR/tor instead.
- - Implement --verify-config command-line option to check if your torrc
- is valid without actually launching Tor.
- o Logging improvements:
- - When dirservers refuse a server descriptor, we now log its
- contactinfo, platform, and the poster's IP address.
- - Only warn once per nickname from add_nickname_list_to_smartlist()
- per failure, so an entrynode or exitnode choice that's down won't
- yell so much.
- - When we're connecting to an OR and he's got a different nickname/key
- than we were expecting, only complain loudly if we're an OP or a
- dirserver. Complaining loudly to the OR admins just confuses them.
- - Whine at you if you're a server and you don't set your contactinfo.
- - Warn when exit policy implicitly allows local addresses.
- - Give a better warning when some other server advertises an
- ORPort that is actually an apache running ssl.
- - If we get an incredibly skewed timestamp from a dirserver mirror
- that isn't a verified OR, don't warn -- it's probably him that's
- wrong.
- - When a dirserver causes you to give a warn, mention which dirserver
- it was.
- - Initialize libevent later in the startup process, so the logs are
- already established by the time we start logging libevent warns.
- - Use correct errno on win32 if libevent fails.
- - Check and warn about known-bad/slow libevent versions.
- - Stop warning about sigpipes in the logs. We're going to
- pretend that getting these occasionally is normal and fine.
- o New contrib scripts:
- - New experimental script tor/contrib/exitlist: a simple python
- script to parse directories and find Tor nodes that exit to listed
- addresses/ports.
- - New experimental script tor/contrib/ExerciseServer.py (needs more
- work) that uses the controller interface to build circuits and
- fetch pages over them. This will help us bootstrap servers that
- have lots of capacity but haven't noticed it yet.
- - New experimental script tor/contrib/PathDemo.py (needs more work)
- that uses the controller interface to let you choose whole paths
- via addresses like
- "<hostname>.<path,separated by dots>.<length of path>.path"
- - New contributed script "privoxy-tor-toggle" to toggle whether
- Privoxy uses Tor. Seems to be configured for Debian by default.
- - Have torctl.in/tor.sh.in check for location of su binary (needed
- on FreeBSD)
- o Misc bugfixes:
- - chdir() to your datadirectory at the *end* of the daemonize process,
- not the beginning. This was a problem because the first time you
- run tor, if your datadir isn't there, and you have runasdaemon set
- to 1, it will try to chdir to it before it tries to create it. Oops.
- - Fix several double-mark-for-close bugs, e.g. where we were finding
- a conn for a cell even if that conn is already marked for close.
- - Stop most cases of hanging up on a socks connection without sending
- the socks reject.
- - Fix a bug in the RPM package: set home directory for _tor to
- something more reasonable when first installing.
- - Stop putting nodename in the Platform string in server descriptors.
- It doesn't actually help, and it is confusing/upsetting some people.
- - When using preferred entry or exit nodes, ignore whether the
- circuit wants uptime or capacity. They asked for the nodes, they
- get the nodes.
- - Tie MAX_DIR_SIZE to MAX_BUF_SIZE, so now directory sizes won't get
- artificially capped at 500kB.
- - Cache local dns resolves correctly even when they're .exit
- addresses.
- - If we're hibernating and we get a SIGINT, exit immediately.
- - tor-resolve requests were ignoring .exit if there was a working circuit
- they could use instead.
- - Pay more attention to the ClientOnly config option.
- - Resolve OS X installer bugs: stop claiming to be 0.0.9.2 in certain
- installer screens; and don't put stuff into StartupItems unless
- the user asks you to.
- o Misc features:
- - Rewrite address "serifos.exit" to "externalIP.serifos.exit"
- rather than just rejecting it.
- - If our clock jumps forward by 100 seconds or more, assume something
- has gone wrong with our network and abandon all not-yet-used circs.
- - When an application is using socks5, give him the whole variety of
- potential socks5 responses (connect refused, host unreachable, etc),
- rather than just "success" or "failure".
- - A more sane version numbering system. See
- http://tor.eff.org/cvs/tor/doc/version-spec.txt for details.
- - Change version parsing logic: a version is "obsolete" if it is not
- recommended and (1) there is a newer recommended version in the
- same series, or (2) there are no recommended versions in the same
- series, but there are some recommended versions in a newer series.
- A version is "new" if it is newer than any recommended version in
- the same series.
- - Report HTTP reasons to client when getting a response from directory
- servers -- so you can actually know what went wrong.
- - Reject odd-looking addresses at the client (e.g. addresses that
- contain a colon), rather than having the server drop them because
- they're malformed.
- - Stop publishing socksport in the directory, since it's not
- actually meant to be public. For compatibility, publish a 0 there
- for now.
- - Since we ship our own Privoxy on OS X, tweak it so it doesn't write
- cookies to disk and doesn't log each web request to disk. (Thanks
- to Brett Carrington for pointing this out.)
- - Add OSX uninstall instructions. An actual uninstall script will
- come later.
- - Add "opt hibernating 1" to server descriptor to make it clearer
- whether the server is hibernating.
- Changes in version 0.0.9.10 - 2005-06-16
- o Bugfixes on 0.0.9.x (backported from 0.1.0.10):
- - Refuse relay cells that claim to have a length larger than the
- maximum allowed. This prevents a potential attack that could read
- arbitrary memory (e.g. keys) from an exit server's process
- (CVE-2005-2050).
- Changes in version 0.0.9.9 - 2005-04-23
- o Bugfixes on 0.0.9.x:
- - If unofficial Tor clients connect and send weird TLS certs, our
- Tor server triggers an assert. This release contains a minimal
- backport from the broader fix that we put into 0.1.0.4-rc.
- Changes in version 0.0.9.8 - 2005-04-07
- o Bugfixes on 0.0.9.x:
- - We have a bug that I haven't found yet. Sometimes, very rarely,
- cpuworkers get stuck in the 'busy' state, even though the cpuworker
- thinks of itself as idle. This meant that no new circuits ever got
- established. Here's a workaround to kill any cpuworker that's been
- busy for more than 100 seconds.
- Changes in version 0.0.9.7 - 2005-04-01
- o Bugfixes on 0.0.9.x:
- - Fix another race crash bug (thanks to Glenn Fink for reporting).
- - Compare identity to identity, not to nickname, when extending to
- a router not already in the directory. This was preventing us from
- extending to unknown routers. Oops.
- - Make sure to create OS X Tor user in <500 range, so we aren't
- creating actual system users.
- - Note where connection-that-hasn't-sent-end was marked, and fix
- a few really loud instances of this harmless bug (it's fixed more
- in 0.1.0.x).
- Changes in version 0.0.9.6 - 2005-03-24
- o Bugfixes on 0.0.9.x (crashes and asserts):
- - Add new end stream reasons to maintenance branch. Fix bug where
- reason (8) could trigger an assert. Prevent bug from recurring.
- - Apparently win32 stat wants paths to not end with a slash.
- - Fix assert triggers in assert_cpath_layer_ok(), where we were
- blowing away the circuit that conn->cpath_layer points to, then
- checking to see if the circ is well-formed. Backport check to make
- sure we dont use the cpath on a closed connection.
- - Prevent circuit_resume_edge_reading_helper() from trying to package
- inbufs for marked-for-close streams.
- - Don't crash on hup if your options->address has become unresolvable.
- - Some systems (like OS X) sometimes accept() a connection and tell
- you the remote host is 0.0.0.0:0. If this happens, due to some
- other mis-features, we get confused; so refuse the conn for now.
- o Bugfixes on 0.0.9.x (other):
- - Fix harmless but scary "Unrecognized content encoding" warn message.
- - Add new stream error reason: TORPROTOCOL reason means "you are not
- speaking a version of Tor I understand; say bye-bye to your stream."
- - Be willing to cache directories from up to ROUTER_MAX_AGE seconds
- into the future, now that we are more tolerant of skew. This
- resolves a bug where a Tor server would refuse to cache a directory
- because all the directories it gets are too far in the future;
- yet the Tor server never logs any complaints about clock skew.
- - Mac packaging magic: make man pages useable, and do not overwrite
- existing torrc files.
- - Make OS X log happily to /var/log/tor/tor.log
- Changes in version 0.0.9.5 - 2005-02-22
- o Bugfixes on 0.0.9.x:
- - Fix an assert race at exit nodes when resolve requests fail.
- - Stop picking unverified dir mirrors--it only leads to misery.
- - Patch from Matt Edman to make NT services work better. Service
- support is still not compiled into the executable by default.
- - Patch from Dmitri Bely so the Tor service runs better under
- the win32 SYSTEM account.
- - Make tor-resolve actually work (?) on Win32.
- - Fix a sign bug when getrlimit claims to have 4+ billion
- file descriptors available.
- - Stop refusing to start when bandwidthburst == bandwidthrate.
- - When create cells have been on the onion queue more than five
- seconds, just send back a destroy and take them off the list.
- Changes in version 0.0.9.4 - 2005-02-03
- o Bugfixes on 0.0.9:
- - Fix an assert bug that took down most of our servers: when
- a server claims to have 1 GB of bandwidthburst, don't
- freak out.
- - Don't crash as badly if we have spawned the max allowed number
- of dnsworkers, or we're out of file descriptors.
- - Block more file-sharing ports in the default exit policy.
- - MaxConn is now automatically set to the hard limit of max
- file descriptors we're allowed (ulimit -n), minus a few for
- logs, etc.
- - Give a clearer message when servers need to raise their
- ulimit -n when they start running out of file descriptors.
- - SGI Compatibility patches from Jan Schaumann.
- - Tolerate a corrupt cached directory better.
- - When a dirserver hasn't approved your server, list which one.
- - Go into soft hibernation after 95% of the bandwidth is used,
- not 99%. This is especially important for daily hibernators who
- have a small accounting max. Hopefully it will result in fewer
- cut connections when the hard hibernation starts.
- - Load-balance better when using servers that claim more than
- 800kB/s of capacity.
- - Make NT services work (experimental, only used if compiled in).
- Changes in version 0.0.9.3 - 2005-01-21
- o Bugfixes on 0.0.9:
- - Backport the cpu use fixes from main branch, so busy servers won't
- need as much processor time.
- - Work better when we go offline and then come back, or when we
- run Tor at boot before the network is up. We do this by
- optimistically trying to fetch a new directory whenever an
- application request comes in and we think we're offline -- the
- human is hopefully a good measure of when the network is back.
- - Backport some minimal hidserv bugfixes: keep rend circuits open as
- long as you keep using them; actually publish hidserv descriptors
- shortly after they change, rather than waiting 20-40 minutes.
- - Enable Mac startup script by default.
- - Fix duplicate dns_cancel_pending_resolve reported by Giorgos Pallas.
- - When you update AllowUnverifiedNodes or FirewallPorts via the
- controller's setconf feature, we were always appending, never
- resetting.
- - When you update HiddenServiceDir via setconf, it was screwing up
- the order of reading the lines, making it fail.
- - Do not rewrite a cached directory back to the cache; otherwise we
- will think it is recent and not fetch a newer one on startup.
- - Workaround for webservers that lie about Content-Encoding: Tor
- now tries to autodetect compressed directories and compression
- itself. This lets us Proxypass dir fetches through apache.
- Changes in version 0.0.9.2 - 2005-01-04
- o Bugfixes on 0.0.9 (crashes and asserts):
- - Fix an assert on startup when the disk is full and you're logging
- to a file.
- - If you do socks4 with an IP of 0.0.0.x but *don't* provide a socks4a
- style address, then we'd crash.
- - Fix an assert trigger when the running-routers string we get from
- a dirserver is broken.
- - Make worker threads start and run on win32. Now win32 servers
- may work better.
- - Bandaid (not actually fix, but now it doesn't crash) an assert
- where the dns worker dies mysteriously and the main Tor process
- doesn't remember anything about the address it was resolving.
- o Bugfixes on 0.0.9 (Win32):
- - Workaround for brain-damaged __FILE__ handling on MSVC: keep Nick's
- name out of the warning/assert messages.
- - Fix a superficial "unhandled error on read" bug on win32.
- - The win32 installer no longer requires a click-through for our
- license, since our Free Software license grants rights but does not
- take any away.
- - Win32: When connecting to a dirserver fails, try another one
- immediately. (This was already working for non-win32 Tors.)
- - Stop trying to parse $HOME on win32 when hunting for default
- DataDirectory.
- - Make tor-resolve.c work on win32 by calling network_init().
- o Bugfixes on 0.0.9 (other):
- - Make 0.0.9.x build on Solaris again.
- - Due to a fencepost error, we were blowing away the \n when reporting
- confvalue items in the controller. So asking for multiple config
- values at once couldn't work.
- - When listing circuits that are pending on an opening OR connection,
- if we're an OR we were listing circuits that *end* at us as
- being pending on every listener, dns/cpu worker, etc. Stop that.
- - Dirservers were failing to create 'running-routers' or 'directory'
- strings if we had more than some threshold of routers. Fix them so
- they can handle any number of routers.
- - Fix a superficial "Duplicate mark for close" bug.
- - Stop checking for clock skew for OR connections, even for servers.
- - Fix a fencepost error that was chopping off the last letter of any
- nickname that is the maximum allowed nickname length.
- - Update URLs in log messages so they point to the new website.
- - Fix a potential problem in mangling server private keys while
- writing to disk (not triggered yet, as far as we know).
- - Include the licenses for other free software we include in Tor,
- now that we're shipping binary distributions more regularly.
- Changes in version 0.0.9.1 - 2004-12-15
- o Bugfixes on 0.0.9:
- - Make hibernation actually work.
- - Make HashedControlPassword config option work.
- - When we're reporting event circuit status to a controller,
- don't use the stream status code.
- Changes in version 0.0.9 - 2004-12-12
- o Bugfixes on 0.0.8.1 (Crashes and asserts):
- - Catch and ignore SIGXFSZ signals when log files exceed 2GB; our
- write() call will fail and we handle it there.
- - When we run out of disk space, or other log writing error, don't
- crash. Just stop logging to that log and continue.
- - Fix isspace() and friends so they still make Solaris happy
- but also so they don't trigger asserts on win32.
- - Fix assert failure on malformed socks4a requests.
- - Fix an assert bug where a hidden service provider would fail if
- the first hop of his rendezvous circuit was down.
- - Better handling of size_t vs int, so we're more robust on 64
- bit platforms.
- o Bugfixes on 0.0.8.1 (Win32):
- - Make windows sockets actually non-blocking (oops), and handle
- win32 socket errors better.
- - Fix parse_iso_time on platforms without strptime (eg win32).
- - win32: when being multithreaded, leave parent fdarray open.
- - Better handling of winsock includes on non-MSV win32 compilers.
- - Change our file IO stuff (especially wrt OpenSSL) so win32 is
- happier.
- - Make unit tests work on win32.
- o Bugfixes on 0.0.8.1 (Path selection and streams):
- - Calculate timeout for waiting for a connected cell from the time
- we sent the begin cell, not from the time the stream started. If
- it took a long time to establish the circuit, we would time out
- right after sending the begin cell.
- - Fix router_compare_addr_to_addr_policy: it was not treating a port
- of * as always matching, so we were picking reject *:* nodes as
- exit nodes too. Oops.
- - When read() failed on a stream, we would close it without sending
- back an end. So 'connection refused' would simply be ignored and
- the user would get no response.
- - Stop a sigpipe: when an 'end' cell races with eof from the app,
- we shouldn't hold-open-until-flush if the eof arrived first.
- - Let resolve conns retry/expire also, rather than sticking around
- forever.
- - Fix more dns related bugs: send back resolve_failed and end cells
- more reliably when the resolve fails, rather than closing the
- circuit and then trying to send the cell. Also attach dummy resolve
- connections to a circuit *before* calling dns_resolve(), to fix
- a bug where cached answers would never be sent in RESOLVED cells.
- o Bugfixes on 0.0.8.1 (Circuits):
- - Finally fix a bug that's been plaguing us for a year:
- With high load, circuit package window was reaching 0. Whenever
- we got a circuit-level sendme, we were reading a lot on each
- socket, but only writing out a bit. So we would eventually reach
- eof. This would be noticed and acted on even when there were still
- bytes sitting in the inbuf.
- - Use identity comparison, not nickname comparison, to choose which
- half of circuit-ID-space each side gets to use. This is needed
- because sometimes we think of a router as a nickname, and sometimes
- as a hex ID, and we can't predict what the other side will do.
- o Bugfixes on 0.0.8.1 (Other):
- - Fix a whole slew of memory leaks.
- - Disallow NDEBUG. We don't ever want anybody to turn off debug.
- - If we are using select, make sure we stay within FD_SETSIZE.
- - When poll() is interrupted, we shouldn't believe the revents values.
- - Add a FAST_SMARTLIST define to optionally inline smartlist_get
- and smartlist_len, which are two major profiling offenders.
- - If do_hup fails, actually notice.
- - Flush the log file descriptor after we print "Tor opening log file",
- so we don't see those messages days later.
- - Hidden service operators now correctly handle version 1 style
- INTRODUCE1 cells (nobody generates them still, so not a critical
- bug).
- - Handle more errnos from accept() without closing the listener.
- Some OpenBSD machines were closing their listeners because
- they ran out of file descriptors.
- - Some people had wrapped their tor client/server in a script
- that would restart it whenever it died. This did not play well
- with our "shut down if your version is obsolete" code. Now people
- don't fetch a new directory if their local cached version is
- recent enough.
- - Make our autogen.sh work on ksh as well as bash.
- - Better torrc example lines for dirbindaddress and orbindaddress.
- - Improved bounds checking on parsed ints (e.g. config options and
- the ones we find in directories.)
- - Stop using separate defaults for no-config-file and
- empty-config-file. Now you have to explicitly turn off SocksPort,
- if you don't want it open.
- - We were starting to daemonize before we opened our logs, so if
- there were any problems opening logs, we would complain to stderr,
- which wouldn't work, and then mysteriously exit.
- - If a verified OR connects to us before he's uploaded his descriptor,
- or we verify him and hup but he still has the original TLS
- connection, then conn->nickname is still set like he's unverified.
- o Code security improvements, inspired by Ilja:
- - tor_snprintf wrapper over snprintf with consistent (though not C99)
- overflow behavior.
- - Replace sprintf with tor_snprintf. (I think they were all safe, but
- hey.)
- - Replace strcpy/strncpy with strlcpy in more places.
- - Avoid strcat; use tor_snprintf or strlcat instead.
- o Features (circuits and streams):
- - New circuit building strategy: keep a list of ports that we've
- used in the past 6 hours, and always try to have 2 circuits open
- or on the way that will handle each such port. Seed us with port
- 80 so web users won't complain that Tor is "slow to start up".
- - Make kill -USR1 dump more useful stats about circuits.
- - When warning about retrying or giving up, print the address, so
- the user knows which one it's talking about.
- - If you haven't used a clean circuit in an hour, throw it away,
- just to be on the safe side. (This means after 6 hours a totally
- unused Tor client will have no circuits open.)
- - Support "foo.nickname.exit" addresses, to let Alice request the
- address "foo" as viewed by exit node "nickname". Based on a patch
- from Geoff Goodell.
- - If your requested entry or exit node has advertised bandwidth 0,
- pick it anyway.
- - Be more greedy about filling up relay cells -- we try reading again
- once we've processed the stuff we read, in case enough has arrived
- to fill the last cell completely.
- - Refuse application socks connections to port 0.
- - Use only 0.0.9pre1 and later servers for resolve cells.
- o Features (bandwidth):
- - Hibernation: New config option "AccountingMax" lets you
- set how many bytes per month (in each direction) you want to
- allow your server to consume. Rather than spreading those
- bytes out evenly over the month, we instead hibernate for some
- of the month and pop up at a deterministic time, work until
- the bytes are consumed, then hibernate again. Config option
- "MonthlyAccountingStart" lets you specify which day of the month
- your billing cycle starts on.
- - Implement weekly/monthly/daily accounting: now you specify your
- hibernation properties by
- AccountingMax N bytes|KB|MB|GB|TB
- AccountingStart day|week|month [day] HH:MM
- Defaults to "month 1 0:00".
- - Let bandwidth and interval config options be specified as 5 bytes,
- kb, kilobytes, etc; and as seconds, minutes, hours, days, weeks.
- o Features (directories):
- - New "router-status" line in directory, to better bind each verified
- nickname to its identity key.
- - Clients can ask dirservers for /dir.z to get a compressed version
- of the directory. Only works for servers running 0.0.9, of course.
- - Make clients cache directories and use them to seed their router
- lists at startup. This means clients have a datadir again.
- - Respond to content-encoding headers by trying to uncompress as
- appropriate.
- - Clients and servers now fetch running-routers; cache
- running-routers; compress running-routers; serve compressed
- running-routers.z
- - Make moria2 advertise a dirport of 80, so people behind firewalls
- will be able to get a directory.
- - Http proxy support
- - Dirservers translate requests for http://%s:%d/x to /x
- - You can specify "HttpProxy %s[:%d]" and all dir fetches will
- be routed through this host.
- - Clients ask for /tor/x rather than /x for new enough dirservers.
- This way we can one day coexist peacefully with apache.
- - Clients specify a "Host: %s%d" http header, to be compatible
- with more proxies, and so running squid on an exit node can work.
- - Protect dirservers from overzealous descriptor uploading -- wait
- 10 seconds after directory gets dirty, before regenerating.
- o Features (packages and install):
- - Add NSI installer contributed by J Doe.
- - Apply NT service patch from Osamu Fujino. Still needs more work.
- - Commit VC6 and VC7 workspace/project files.
- - Commit a tor.spec for making RPM files, with help from jbash.
- - Add contrib/torctl.in contributed by Glenn Fink.
- - Make expand_filename handle ~ and ~username.
- - Use autoconf to enable largefile support where necessary. Use
- ftello where available, since ftell can fail at 2GB.
- - Ship src/win32/ in the tarball, so people can use it to build.
- - Make old win32 fall back to CWD if SHGetSpecialFolderLocation
- is broken.
- o Features (ui controller):
- - Control interface: a separate program can now talk to your
- client/server over a socket, and get/set config options, receive
- notifications of circuits and streams starting/finishing/dying,
- bandwidth used, etc. The next step is to get some GUIs working.
- Let us know if you want to help out. See doc/control-spec.txt .
- - Ship a contrib/tor-control.py as an example script to interact
- with the control port.
- - "tor --hash-password zzyxz" will output a salted password for
- use in authenticating to the control interface.
- - Implement the control-spec's SAVECONF command, to write your
- configuration to torrc.
- - Get cookie authentication for the controller closer to working.
- - When set_conf changes our server descriptor, upload a new copy.
- But don't upload it too often if there are frequent changes.
- o Features (config and command-line):
- - Deprecate unofficial config option abbreviations, and abbreviations
- not on the command line.
- - Configuration infrastructure support for warning on obsolete
- options.
- - Give a slightly more useful output for "tor -h".
- - Break DirFetchPostPeriod into:
- - DirFetchPeriod for fetching full directory,
- - StatusFetchPeriod for fetching running-routers,
- - DirPostPeriod for posting server descriptor,
- - RendPostPeriod for posting hidden service descriptors.
- - New log format in config:
- "Log minsev[-maxsev] stdout|stderr|syslog" or
- "Log minsev[-maxsev] file /var/foo"
- - DirPolicy config option, to let people reject incoming addresses
- from their dirserver.
- - "tor --list-fingerprint" will list your identity key fingerprint
- and then exit.
- - Make tor --version --version dump the cvs Id of every file.
- - New 'MyFamily nick1,...' config option for a server to
- specify other servers that shouldn't be used in the same circuit
- with it. Only believed if nick1 also specifies us.
- - New 'NodeFamily nick1,nick2,...' config option for a client to
- specify nodes that it doesn't want to use in the same circuit.
- - New 'Redirectexit pattern address:port' config option for a
- server to redirect exit connections, e.g. to a local squid.
- - Add "pass" target for RedirectExit, to make it easier to break
- out of a sequence of RedirectExit rules.
- - Make the dirservers file obsolete.
- - Include a dir-signing-key token in directories to tell the
- parsing entity which key is being used to sign.
- - Remove the built-in bulky default dirservers string.
- - New config option "Dirserver %s:%d [fingerprint]", which can be
- repeated as many times as needed. If no dirservers specified,
- default to moria1,moria2,tor26.
- - Make 'Routerfile' config option obsolete.
- - Discourage people from setting their dirfetchpostperiod more often
- than once per minute.
- o Features (other):
- - kill -USR2 now moves all logs to loglevel debug (kill -HUP to
- get back to normal.)
- - Accept *:706 (silc) in default exit policy.
- - Implement new versioning format for post 0.1.
- - Distinguish between TOR_TLS_CLOSE and TOR_TLS_ERROR, so we can
- log more informatively.
- - Check clock skew for verified servers, but allow unverified
- servers and clients to have any clock skew.
- - Make sure the hidden service descriptors are at a random offset
- from each other, to hinder linkability.
- - Clients now generate a TLS cert too, in preparation for having
- them act more like real nodes.
- - Add a pure-C tor-resolve implementation.
- - Use getrlimit and friends to ensure we can reach MaxConn (currently
- 1024) file descriptors.
- - Raise the max dns workers from 50 to 100.
- Changes in version 0.0.8.1 - 2004-10-13
- o Bugfixes:
- - Fix a seg fault that can be triggered remotely for Tor
- clients/servers with an open dirport.
- - Fix a rare assert trigger, where routerinfos for entries in
- our cpath would expire while we're building the path.
- - Fix a bug in OutboundBindAddress so it (hopefully) works.
- - Fix a rare seg fault for people running hidden services on
- intermittent connections.
- - Fix a bug in parsing opt keywords with objects.
- - Fix a stale pointer assert bug when a stream detaches and
- reattaches.
- - Fix a string format vulnerability (probably not exploitable)
- in reporting stats locally.
- - Fix an assert trigger: sometimes launching circuits can fail
- immediately, e.g. because too many circuits have failed recently.
- - Fix a compile warning on 64 bit platforms.
- Changes in version 0.0.8 - 2004-08-25
- o Bugfixes:
- - Made our unit tests compile again on OpenBSD 3.5, and tor
- itself compile again on OpenBSD on a sparc64.
- - We were neglecting milliseconds when logging on win32, so
- everything appeared to happen at the beginning of each second.
- - Check directory signature _before_ you decide whether you're
- you're running an obsolete version and should exit.
- - Check directory signature _before_ you parse the running-routers
- list to decide who's running.
- - Check return value of fclose while writing to disk, so we don't
- end up with broken files when servers run out of disk space.
- - Port it to SunOS 5.9 / Athena
- - Fix two bugs in saving onion keys to disk when rotating, so
- hopefully we'll get fewer people using old onion keys.
- - Remove our mostly unused -- and broken -- hex_encode()
- function. Use base16_encode() instead. (Thanks to Timo Lindfors
- for pointing out this bug.)
- - Only pick and establish intro points after we've gotten a
- directory.
- - Fix assert triggers: if the other side returns an address 0.0.0.0,
- don't put it into the client dns cache.
- - If a begin failed due to exit policy, but we believe the IP
- address should have been allowed, switch that router to exitpolicy
- reject *:* until we get our next directory.
- o Protocol changes:
- - 'Extend' relay cell payloads now include the digest of the
- intended next hop's identity key. Now we can verify that we're
- extending to the right router, and also extend to routers we
- hadn't heard of before.
- o Features:
- - Tor nodes can now act as relays (with an advertised ORPort)
- without being manually verified by the dirserver operators.
- - Uploaded descriptors of unverified routers are now accepted
- by the dirservers, and included in the directory.
- - Verified routers are listed by nickname in the running-routers
- list; unverified routers are listed as "$<fingerprint>".
- - We now use hash-of-identity-key in most places rather than
- nickname or addr:port, for improved security/flexibility.
- - AllowUnverifiedNodes config option to let circuits choose no-name
- routers in entry,middle,exit,introduction,rendezvous positions.
- Allow middle and rendezvous positions by default.
- - When picking unverified routers, skip those with low uptime and/or
- low bandwidth, depending on what properties you care about.
- - ClientOnly option for nodes that never want to become servers.
- - Directory caching.
- - "AuthoritativeDir 1" option for the official dirservers.
- - Now other nodes (clients and servers) will cache the latest
- directory they've pulled down.
- - They can enable their DirPort to serve it to others.
- - Clients will pull down a directory from any node with an open
- DirPort, and check the signature/timestamp correctly.
- - Authoritative dirservers now fetch directories from other
- authdirservers, to stay better synced.
- - Running-routers list tells who's down also, along with noting
- if they're verified (listed by nickname) or unverified (listed
- by hash-of-key).
- - Allow dirservers to serve running-router list separately.
- This isn't used yet.
- - You can now fetch $DIRURL/running-routers to get just the
- running-routers line, not the whole descriptor list. (But
- clients don't use this yet.)
- - Clients choose nodes proportional to advertised bandwidth.
- - Clients avoid using nodes with low uptime as introduction points.
- - Handle servers with dynamic IP addresses: don't just replace
- options->Address with the resolved one at startup, and
- detect our address right before we make a routerinfo each time.
- - 'FascistFirewall' option to pick dirservers and ORs on specific
- ports; plus 'FirewallPorts' config option to tell FascistFirewall
- which ports are open. (Defaults to 80,443)
- - Try other dirservers immediately if the one you try is down. This
- should tolerate down dirservers better now.
- - ORs connect-on-demand to other ORs
- - If you get an extend cell to an OR you're not connected to,
- connect, handshake, and forward the create cell.
- - The authoritative dirservers stay connected to everybody,
- and everybody stays connected to 0.0.7 servers, but otherwise
- clients/servers expire unused connections after 5 minutes.
- - When servers get a sigint, they delay 30 seconds (refusing new
- connections) then exit. A second sigint causes immediate exit.
- - File and name management:
- - Look for .torrc if no CONFDIR "torrc" is found.
- - If no datadir is defined, then choose, make, and secure ~/.tor
- as datadir.
- - If torrc not found, exitpolicy reject *:*.
- - Expands ~/ in filenames to $HOME/ (but doesn't yet expand ~arma).
- - If no nickname is defined, derive default from hostname.
- - Rename secret key files, e.g. identity.key -> secret_id_key,
- to discourage people from mailing their identity key to tor-ops.
- - Refuse to build a circuit before the directory has arrived --
- it won't work anyway, since you won't know the right onion keys
- to use.
- - Parse tor version numbers so we can do an is-newer-than check
- rather than an is-in-the-list check.
- - New socks command 'resolve', to let us shim gethostbyname()
- locally.
- - A 'tor_resolve' script to access the socks resolve functionality.
- - A new socks-extensions.txt doc file to describe our
- interpretation and extensions to the socks protocols.
- - Add a ContactInfo option, which gets published in descriptor.
- - Write tor version at the top of each log file
- - New docs in the tarball:
- - tor-doc.html.
- - Document that you should proxy your SSL traffic too.
- - Log a warning if the user uses an unsafe socks variant, so people
- are more likely to learn about privoxy or socat.
- - Log a warning if you're running an unverified server, to let you
- know you might want to get it verified.
- - Change the default exit policy to reject the default edonkey,
- kazaa, gnutella ports.
- - Add replace_file() to util.[ch] to handle win32's rename().
- - Publish OR uptime in descriptor (and thus in directory) too.
- - Remember used bandwidth (both in and out), and publish 15-minute
- snapshots for the past day into our descriptor.
- - Be more aggressive about trying to make circuits when the network
- has changed (e.g. when you unsuspend your laptop).
- - Check for time skew on http headers; report date in response to
- "GET /".
- - If the entrynode config line has only one node, don't pick it as
- an exitnode.
- - Add strict{entry|exit}nodes config options. If set to 1, then
- we refuse to build circuits that don't include the specified entry
- or exit nodes.
- - OutboundBindAddress config option, to bind to a specific
- IP address for outgoing connect()s.
- - End truncated log entries (e.g. directories) with "[truncated]".
- Changes in version 0.0.7.3 - 2004-08-12
- o Stop dnsworkers from triggering an assert failure when you
- ask them to resolve the host "".
- Changes in version 0.0.7.2 - 2004-07-07
- o A better fix for the 0.0.0.0 problem, that will hopefully
- eliminate the remaining related assertion failures.
- Changes in version 0.0.7.1 - 2004-07-04
- o When an address resolves to 0.0.0.0, treat it as a failed resolve,
- since internally we use 0.0.0.0 to signify "not yet resolved".
- Changes in version 0.0.7 - 2004-06-07
- o Fixes for crashes and other obnoxious bugs:
- - Fix an epipe bug: sometimes when directory connections failed
- to connect, we would give them a chance to flush before closing
- them.
- - When we detached from a circuit because of resolvefailed, we
- would immediately try the same circuit twice more, and then
- give up on the resolve thinking we'd tried three different
- exit nodes.
- - Limit the number of intro circuits we'll attempt to build for a
- hidden service per 15-minute period.
- - Check recommended-software string *early*, before actually parsing
- the directory. Thus we can detect an obsolete version and exit,
- even if the new directory format doesn't parse.
- o Fixes for security bugs:
- - Remember which nodes are dirservers when you startup, and if a
- random OR enables his dirport, don't automatically assume he's
- a trusted dirserver.
- o Other bugfixes:
- - Directory connections were asking the wrong poll socket to
- start writing, and not asking themselves to start writing.
- - When we detached from a circuit because we sent a begin but
- didn't get a connected, we would use it again the first time;
- but after that we would correctly switch to a different one.
- - Stop warning when the first onion decrypt attempt fails; they
- will sometimes legitimately fail now that we rotate keys.
- - Override unaligned-access-ok check when $host_cpu is ia64 or
- arm. Apparently they allow it but the kernel whines.
- - Dirservers try to reconnect periodically too, in case connections
- have failed.
- - Fix some memory leaks in directory servers.
- - Allow backslash in Win32 filenames.
- - Made Tor build complain-free on FreeBSD, hopefully without
- breaking other BSD builds. We'll see.
- - Check directory signatures based on name of signer, not on whom
- we got the directory from. This will let us cache directories more
- easily.
- - Rotate dnsworkers and cpuworkers on SIGHUP, so they get new config
- settings too.
- o Features:
- - Doxygen markup on all functions and global variables.
- - Make directory functions update routerlist, not replace it. So
- now directory disagreements are not so critical a problem.
- - Remove the upper limit on number of descriptors in a dirserver's
- directory (not that we were anywhere close).
- - Allow multiple logfiles at different severity ranges.
- - Allow *BindAddress to specify ":port" rather than setting *Port
- separately. Allow multiple instances of each BindAddress config
- option, so you can bind to multiple interfaces if you want.
- - Allow multiple exit policy lines, which are processed in order.
- Now we don't need that huge line with all the commas in it.
- - Enable accept/reject policies on SOCKS connections, so you can bind
- to 0.0.0.0 but still control who can use your OP.
- - Updated the man page to reflect these features.
- Changes in version 0.0.6.2 - 2004-05-16
- o Our integrity-checking digest was checking only the most recent cell,
- not the previous cells like we'd thought.
- Thanks to Stefan Mark for finding the flaw!
- Changes in version 0.0.6.1 - 2004-05-06
- o Fix two bugs in our AES counter-mode implementation (this affected
- onion-level stream encryption, but not TLS-level). It turns
- out we were doing something much more akin to a 16-character
- polyalphabetic cipher. Oops.
- Thanks to Stefan Mark for finding the flaw!
- o Retire moria3 as a directory server, and add tor26 as a directory
- server.
- Changes in version 0.0.6 - 2004-05-02
- o Features:
- - Hidden services and rendezvous points are implemented. Go to
- http://6sxoyfb3h2nvok2d.onion/ for an index of currently available
- hidden services. (This only works via a socks4a proxy such as
- Privoxy, and currently it's quite slow.)
- - We now rotate link (tls context) keys and onion keys.
- - CREATE cells now include oaep padding, so you can tell
- if you decrypted them correctly.
- - Retry stream correctly when we fail to connect because of
- exit-policy-reject (should try another) or can't-resolve-address.
- - When we hup a dirserver and we've *removed* a server from the
- approved-routers list, now we remove that server from the
- in-memory directories too.
- - Add bandwidthburst to server descriptor.
- - Directories now say which dirserver signed them.
- - Use a tor_assert macro that logs failed assertions too.
- - Since we don't support truncateds much, don't bother sending them;
- just close the circ.
- - Fetch randomness from /dev/urandom better (not via fopen/fread)
- - Better debugging for tls errors
- - Set Content-Type on the directory and hidserv descriptor.
- - Remove IVs from cipher code, since AES-ctr has none.
- o Bugfixes:
- - Fix an assert trigger for exit nodes that's been plaguing us since
- the days of 0.0.2prexx (thanks weasel!)
- - Fix a bug where we were closing tls connections intermittently.
- It turns out openssl keeps its errors around -- so if an error
- happens, and you don't ask about it, and then another openssl
- operation happens and succeeds, and you ask if there was an error,
- it tells you about the first error.
- - Fix a bug that's been lurking since 27 may 03 (!)
- When passing back a destroy cell, we would use the wrong circ id.
- - Don't crash if a conn that sent a begin has suddenly lost its circuit.
- - Some versions of openssl have an SSL_pending function that erroneously
- returns bytes when there is a non-application record pending.
- - Win32 fixes. Tor now compiles on win32 with no warnings/errors.
- o We were using an array of length zero in a few places.
- o Win32's gethostbyname can't resolve an IP to an IP.
- o Win32's close can't close a socket.
- o Handle windows socket errors correctly.
- o Portability:
- - check for <sys/limits.h> so we build on FreeBSD again, and
- <machine/limits.h> for NetBSD.
- Changes in version 0.0.5 - 2004-03-30
- o Install torrc as torrc.sample -- we no longer clobber your
- torrc. (Woo!)
- o Fix mangled-state bug in directory fetching (was causing sigpipes).
- o Only build circuits after we've fetched the directory: clients were
- using only the directory servers before they'd fetched a directory.
- This also means longer startup time; so it goes.
- o Fix an assert trigger where an OP would fail to handshake, and we'd
- expect it to have a nickname.
- o Work around a tsocks bug: do a socks reject when AP connection dies
- early, else tsocks goes into an infinite loop.
- o Hold socks connection open until reply is flushed (if possible)
- o Make exit nodes resolve IPs to IPs immediately, rather than asking
- the dns farm to do it.
- o Fix c99 aliasing warnings in rephist.c
- o Don't include server descriptors that are older than 24 hours in the
- directory.
- o Give socks 'reject' replies their whole 15s to attempt to flush,
- rather than seeing the 60s timeout and assuming the flush had failed.
- o Clean automake droppings from the cvs repository
- o Add in a 'notice' log level for things the operator should hear
- but that aren't warnings
- Changes in version 0.0.4 - 2004-03-26
- o When connecting to a dirserver or OR and the network is down,
- we would crash.
- Changes in version 0.0.3 - 2004-03-26
- o Warn and fail if server chose a nickname with illegal characters
- o Port to Solaris and Sparc:
- - include missing header fcntl.h
- - have autoconf find -lsocket -lnsl automatically
- - deal with hardware word alignment
- - make uname() work (solaris has a different return convention)
- - switch from using signal() to sigaction()
- o Preliminary work on reputation system:
- - Keep statistics on success/fail of connect attempts; they're published
- by kill -USR1 currently.
- - Add a RunTesting option to try to learn link state by creating test
- circuits, even when SocksPort is off.
- - Remove unused open circuits when there are too many.
- Changes in version 0.0.2 - 2004-03-19
- - Include strlcpy and strlcat for safer string ops
- - define INADDR_NONE so we compile (but still not run) on solaris
- Changes in version 0.0.2pre27 - 2004-03-14
- o Bugfixes:
- - Allow internal tor networks (we were rejecting internal IPs,
- now we allow them if they're set explicitly).
- - And fix a few endian issues.
- Changes in version 0.0.2pre26 - 2004-03-14
- o New features:
- - If a stream times out after 15s without a connected cell, don't
- try that circuit again: try a new one.
- - Retry streams at most 4 times. Then give up.
- - When a dirserver gets a descriptor from an unknown router, it
- logs its fingerprint (so the dirserver operator can choose to
- accept it even without mail from the server operator).
- - Inform unapproved servers when we reject their descriptors.
- - Make tor build on Windows again. It works as a client, who knows
- about as a server.
- - Clearer instructions in the torrc for how to set up a server.
- - Be more efficient about reading fd's when our global token bucket
- (used for rate limiting) becomes empty.
- o Bugfixes:
- - Stop asserting that computers always go forward in time. It's
- simply not true.
- - When we sent a cell (e.g. destroy) and then marked an OR connection
- expired, we might close it before finishing a flush if the other
- side isn't reading right then.
- - Don't allow dirservers to start if they haven't defined
- RecommendedVersions
- - We were caching transient dns failures. Oops.
- - Prevent servers from publishing an internal IP as their address.
- - Address a strcat vulnerability in circuit.c
- Changes in version 0.0.2pre25 - 2004-03-04
- o New features:
- - Put the OR's IP in its router descriptor, not its fqdn. That way
- we'll stop being stalled by gethostbyname for nodes with flaky dns,
- e.g. poblano.
- o Bugfixes:
- - If the user typed in an address that didn't resolve, the server
- crashed.
- Changes in version 0.0.2pre24 - 2004-03-03
- o Bugfixes:
- - Fix an assertion failure in dns.c, where we were trying to dequeue
- a pending dns resolve even if it wasn't pending
- - Fix a spurious socks5 warning about still trying to write after the
- connection is finished.
- - Hold certain marked_for_close connections open until they're finished
- flushing, rather than losing bytes by closing them too early.
- - Correctly report the reason for ending a stream
- - Remove some duplicate calls to connection_mark_for_close
- - Put switch_id and start_daemon earlier in the boot sequence, so it
- will actually try to chdir() to options.DataDirectory
- - Make 'make test' exit(1) if a test fails; fix some unit tests
- - Make tor fail when you use a config option it doesn't know about,
- rather than warn and continue.
- - Make --version work
- - Bugfixes on the rpm spec file and tor.sh, so it's more up to date
- Changes in version 0.0.2pre23 - 2004-02-29
- o New features:
- - Print a statement when the first circ is finished, so the user
- knows it's working.
- - If a relay cell is unrecognized at the end of the circuit,
- send back a destroy. (So attacks to mutate cells are more
- clearly thwarted.)
- - New config option 'excludenodes' to avoid certain nodes for circuits.
- - When it daemonizes, it chdir's to the DataDirectory rather than "/",
- so you can collect coredumps there.
- o Bugfixes:
- - Fix a bug in tls flushing where sometimes data got wedged and
- didn't flush until more data got sent. Hopefully this bug was
- a big factor in the random delays we were seeing.
- - Make 'connected' cells include the resolved IP, so the client
- dns cache actually gets populated.
- - Disallow changing from ORPort=0 to ORPort>0 on hup.
- - When we time-out on a stream and detach from the circuit, send an
- end cell down it first.
- - Only warn about an unknown router (in exitnodes, entrynodes,
- excludenodes) after we've fetched a directory.
- Changes in version 0.0.2pre22 - 2004-02-26
- o New features:
- - Servers publish less revealing uname information in descriptors.
- - More memory tracking and assertions, to crash more usefully when
- errors happen.
- - If the default torrc isn't there, just use some default defaults.
- Plus provide an internal dirservers file if they don't have one.
- - When the user tries to use Tor as an http proxy, give them an http
- 501 failure explaining that we're a socks proxy.
- - Dump a new router.desc on hup, to help confused people who change
- their exit policies and then wonder why router.desc doesn't reflect
- it.
- - Clean up the generic tor.sh init script that we ship with.
- o Bugfixes:
- - If the exit stream is pending on the resolve, and a destroy arrives,
- then the stream wasn't getting removed from the pending list. I
- think this was the one causing recent server crashes.
- - Use a more robust poll on OSX 10.3, since their poll is flaky.
- - When it couldn't resolve any dirservers, it was useless from then on.
- Now it reloads the RouterFile (or default dirservers) if it has no
- dirservers.
- - Move the 'tor' binary back to /usr/local/bin/ -- it turns out
- many users don't even *have* a /usr/local/sbin/.
- Changes in version 0.0.2pre21 - 2004-02-18
- o New features:
- - There's a ChangeLog file that actually reflects the changelog.
- - There's a 'torify' wrapper script, with an accompanying
- tor-tsocks.conf, that simplifies the process of using tsocks for
- tor. It even has a man page.
- - The tor binary gets installed to sbin rather than bin now.
- - Retry streams where the connected cell hasn't arrived in 15 seconds
- - Clean up exit policy handling -- get the default out of the torrc,
- so we can update it without forcing each server operator to fix
- his/her torrc.
- - Allow imaps and pop3s in default exit policy
- o Bugfixes:
- - Prevent picking middleman nodes as the last node in the circuit
- Changes in version 0.0.2pre20 - 2004-01-30
- o New features:
- - We now have a deb package, and it's in debian unstable. Go to
- it, apt-getters. :)
- - I've split the TotalBandwidth option into BandwidthRate (how many
- bytes per second you want to allow, long-term) and
- BandwidthBurst (how many bytes you will allow at once before the cap
- kicks in). This better token bucket approach lets you, say, set
- BandwidthRate to 10KB/s and BandwidthBurst to 10MB, allowing good
- performance while not exceeding your monthly bandwidth quota.
- - Push out a tls record's worth of data once you've got it, rather
- than waiting until you've read everything waiting to be read. This
- may improve performance by pipelining better. We'll see.
- - Add an AP_CONN_STATE_CONNECTING state, to allow streams to detach
- from failed circuits (if they haven't been connected yet) and attach
- to new ones.
- - Expire old streams that haven't managed to connect. Some day we'll
- have them reattach to new circuits instead.
- o Bugfixes:
- - Fix several memory leaks that were causing servers to become bloated
- after a while.
- - Fix a few very rare assert triggers. A few more remain.
- - Setuid to User _before_ complaining about running as root.
- Changes in version 0.0.2pre19 - 2004-01-07
- o Bugfixes:
- - Fix deadlock condition in dns farm. We were telling a child to die by
- closing the parent's file descriptor to him. But newer children were
- inheriting the open file descriptor from the parent, and since they
- weren't closing it, the socket never closed, so the child never read
- eof, so he never knew to exit. Similarly, dns workers were holding
- open other sockets, leading to all sorts of chaos.
- - New cleaner daemon() code for forking and backgrounding.
- - If you log to a file, it now prints an entry at the top of the
- logfile so you know it's working.
- - The onionskin challenge length was 30 bytes longer than necessary.
- - Started to patch up the spec so it's not quite so out of date.
- Changes in version 0.0.2pre18 - 2004-01-02
- o Bugfixes:
- - Fix endian issues with the 'integrity' field in the relay header.
- - Fix a potential bug where connections in state
- AP_CONN_STATE_CIRCUIT_WAIT might unexpectedly ask to write.
- Changes in version 0.0.2pre17 - 2003-12-30
- o Bugfixes:
- - Made --debuglogfile (or any second log file, actually) work.
- - Resolved an edge case in get_unique_circ_id_by_conn where a smart
- adversary could force us into an infinite loop.
- o Features:
- - Each onionskin handshake now includes a hash of the computed key,
- to prove the server's identity and help perfect forward secrecy.
- - Changed cell size from 256 to 512 bytes (working toward compatibility
- with MorphMix).
- - Changed cell length to 2 bytes, and moved it to the relay header.
- - Implemented end-to-end integrity checking for the payloads of
- relay cells.
- - Separated streamid from 'recognized' (otherwise circuits will get
- messed up when we try to have streams exit from the middle). We
- use the integrity-checking to confirm that a cell is addressed to
- this hop.
- - Randomize the initial circid and streamid values, so an adversary who
- breaks into a node can't learn how many circuits or streams have
- been made so far.
- Changes in version 0.0.2pre16 - 2003-12-14
- o Bugfixes:
- - Fixed a bug that made HUP trigger an assert
- - Fixed a bug where a circuit that immediately failed wasn't being
- counted as a failed circuit in counting retries.
- o Features:
- - Now we close the circuit when we get a truncated cell: otherwise we're
- open to an anonymity attack where a bad node in the path truncates
- the circuit and then we open streams at him.
- - Add port ranges to exit policies
- - Add a conservative default exit policy
- - Warn if you're running tor as root
- - on HUP, retry OR connections and close/rebind listeners
- - options.EntryNodes: try these nodes first when picking the first node
- - options.ExitNodes: if your best choices happen to include any of
- your preferred exit nodes, you choose among just those preferred
- exit nodes.
- - options.ExcludedNodes: nodes that are never picked in path building
- Changes in version 0.0.2pre15 - 2003-12-03
- o Robustness and bugfixes:
- - Sometimes clients would cache incorrect DNS resolves, which would
- really screw things up.
- - An OP that goes offline would slowly leak all its sockets and stop
- working.
- - A wide variety of bugfixes in exit node selection, exit policy
- handling, and processing pending streams when a new circuit is
- established.
- - Pick nodes for a path only from those the directory says are up
- - Choose randomly from all running dirservers, not always the first one
- - Increase allowed http header size for directory fetch.
- - Stop writing to stderr (if we're daemonized it will be closed).
- - Enable -g always, so cores will be more useful to me.
- - Switch "-lcrypto -lssl" to "-lssl -lcrypto" for broken distributions.
- o Documentation:
- - Wrote a man page. It lists commonly used options.
- o Configuration:
- - Change default loglevel to warn.
- - Make PidFile default to null rather than littering in your CWD.
- - OnionRouter config option is now obsolete. Instead it just checks
- ORPort>0.
- - Moved to a single unified torrc file for both clients and servers.
- Changes in version 0.0.2pre14 - 2003-11-29
- o Robustness and bugfixes:
- - Force the admin to make the DataDirectory himself
- - to get ownership/permissions right
- - so clients no longer make a DataDirectory and then never use it
- - fix bug where a client who was offline for 45 minutes would never
- pull down a directory again
- - fix (or at least hide really well) the dns assert bug that was
- causing server crashes
- - warnings and improved robustness wrt clockskew for certs
- - use the native daemon(3) to daemonize, when available
- - exit if bind() fails
- - exit if neither socksport nor orport is defined
- - include our own tor_timegm (Win32 doesn't have its own)
- - bugfix for win32 with lots of connections
- - fix minor bias in PRNG
- - make dirserver more robust to corrupt cached directory
- o Documentation:
- - Wrote the design document (woo)
- o Circuit building and exit policies:
- - Circuits no longer try to use nodes that the directory has told them
- are down.
- - Exit policies now support bitmasks (18.0.0.0/255.0.0.0) and
- bitcounts (18.0.0.0/8).
- - Make AP connections standby for a circuit if no suitable circuit
- exists, rather than failing
- - Circuits choose exit node based on addr/port, exit policies, and
- which AP connections are standing by
- - Bump min pathlen from 2 to 3
- - Relay end cells have a payload to describe why the stream ended.
- - If the stream failed because of exit policy, try again with a new
- circuit.
- - Clients have a dns cache to remember resolved addresses.
- - Notice more quickly when we have no working circuits
- o Configuration:
- - APPort is now called SocksPort
- - SocksBindAddress, ORBindAddress, DirBindAddress let you configure
- where to bind
- - RecommendedVersions is now a config variable rather than
- hardcoded (for dirservers)
- - Reloads config on HUP
- - Usage info on -h or --help
- - If you set User and Group config vars, it'll setu/gid to them.
- Changes in version 0.0.2pre13 - 2003-10-19
- o General stability:
- - SSL_write no longer fails when it returns WANTWRITE and the number
- of bytes in the buf has changed by the next SSL_write call.
- - Fix segfault fetching directory when network is down
- - Fix a variety of minor memory leaks
- - Dirservers reload the fingerprints file on HUP, so I don't have
- to take down the network when I approve a new router
- - Default server config file has explicit Address line to specify fqdn
- o Buffers:
- - Buffers grow and shrink as needed (Cut process size from 20M to 2M)
- - Make listener connections not ever alloc bufs
- o Autoconf improvements:
- - don't clobber an external CFLAGS in ./configure
- - Make install now works
- - create var/lib/tor on make install
- - autocreate a tor.sh initscript to help distribs
- - autocreate the torrc and sample-server-torrc with correct paths
- o Log files and Daemonizing now work:
- - If --DebugLogFile is specified, log to it at -l debug
- - If --LogFile is specified, use it instead of commandline
- - If --RunAsDaemon is set, tor forks and backgrounds on startup
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