tor/debian/tor.postinst

#!/bin/sh -e

# checking debian-tor account

uid=`getent passwd debian-tor | cut -d ":" -f 3`
home=`getent passwd debian-tor | cut -d ":" -f 6`

# if there is the uid the account is there and we can do
# the sanit(ar)y checks otherwise we can safely create it.

if [ "$uid" ]; then
    # guess??? the checks!!!
    if [ $uid -ge 100 ] && [ $uid -le 999 ]; then
    	echo "debian-tor uid check: ok"
    else
    	echo "ERROR: debian-tor account has a non-system uid!"
	echo "Please check /usr/share/doc/tor/README.Debian on how to"
	echo "correct this problem"
	exit 1
    fi
    if [ "$home" = "/var/lib/tor" ]; then
        echo "debian-tor homedir check: ok"
    else
	echo "ERROR: debian-tor account has an invalid home directory!"
	echo "Please check /usr/share/doc/tor/README.Debian on how to"
	echo "correct this problem"
	exit 1
    fi
else
    # what this might mean?? oh creating a system l^Huser!
    adduser --quiet \
            --system \
            --disabled-password \
            --home /var/lib/tor \
	    --no-create-home \
	    --shell /bin/bash \
	    --group \
    debian-tor
fi

# ch{owning,moding} things around
# We will do nothing across upgrades.

if [ "$2" = "" ]; then
    for i in lib log run; do
	chown -R debian-tor:debian-tor /var/$i/tor
	chmod -R 700 /var/$i/tor
	find /var/$i/tor -type f -exec chmod 600 '{}' ';'
    done
    chgrp -R adm  /var/log/tor
    chmod -R g+rX /var/log/tor
    chmod    g+s  /var/log/tor
else
    # fix permissions of logs after 0.0.8+0.0.9pre5-1
    if [ "$1" = "configure" ]; then
        if dpkg --compare-versions "$2" le "0.0.8+0.0.9pre5-1" ; then
            chgrp -R adm  /var/log/tor
            chmod -R g+rX /var/log/tor
            chmod    g+s  /var/log/tor
        fi
    fi
fi


move_away_keys=0

if [ "$1" = "configure" ] &&
   [ -e /var/lib/tor/keys ] &&
   [ ! -z "$2" ]; then
	if dpkg --compare-versions "$2" lt 0.1.2.19-2; then
		move_away_keys=1
	fi
fi
if [ "$move_away_keys" = "1" ]; then
	echo "Retiring possibly compromised keys.  See /usr/share/doc/tor/NEWS.Debian.gz"
	echo "and /var/lib/tor/keys/moved-away-by-tor-package/README.REALLY for"
	echo "further information."
	if ! [ -d /var/lib/tor/keys/moved-away-by-tor-package ]; then
		mkdir /var/lib/tor/keys/moved-away-by-tor-package
		cat > /var/lib/tor/keys/moved-away-by-tor-package/README.REALLY << EOF
It has been discovered that the random number generator in Debian's
openssl package is predictable.  This is caused by an incorrect
Debian-specific change to the openssl package (CVE-2008-0166).  As a
result, cryptographic key material may be guessable.

See Debian Security Advisory number 1571 (DSA-1571) for more information:
http://lists.debian.org/debian-security-announce/2008/msg00152.html

The Debian package for Tor has moved away the onion keys upon package
upgrade, and it will have moved away your identity key if it was created
in the affected timeframe.  There is no sure way to automatically tell
if your key was created with an affected openssl library, so this move
is done unconditionally.

If you have restarted Tor since this change (and the package probably
did that for you already unless you configured your system differently)
then the Tor daemon already created new keys for itself and in all
likelyhood is already working just fine with new keys.

If you are absolutely certain that your identity key was created with
a non-affected version of openssl and for some reason you have to retain
the old identity, then you can move back the copy of secret_id_key to
/var/lib/tor/keys.  Do not move back the onion keys, they were created
only recently since they are temporary keys with a lifetime of only a few
days anyway.

Sincerely,
Peter Palfrader, Tue, 13 May 2008 13:32:23 +0200
EOF
	fi
	for f in secret_onion_key secret_onion_key.old; do
		if [ -e /var/lib/tor/keys/"$f" ]; then
			mv -v /var/lib/tor/keys/"$f" /var/lib/tor/keys/moved-away-by-tor-package/"$f"
		fi
	done
	if [ -e /var/lib/tor/keys/secret_id_key ]; then
		id_mtime=`/usr/bin/stat -c %Y /var/lib/tor/keys/secret_id_key`
		sept=`date -d '2006-09-10' +%s`
		if [ "$id_mtime" -gt "$sept" ] ; then
			mv -v /var/lib/tor/keys/secret_id_key /var/lib/tor/keys/moved-away-by-tor-package/secret_id_key
		fi
	fi
fi


#DEBHELPER#

exit 0