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After months of work, Tor 0.3.3.6 is now available! This is the
first stable release in the 0.3.3.x series, and we hope you find it
useful.
You can download the source code from the usual place on the website.
If you don't build Tor from source, don't worry! Packages should be
available within the next several weeks, with a new
Tor Browser by some time in June.
=====
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 tuned 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 accross 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.
Tor Browser 7.5.4 is now available from the Tor Browser Project page [1]
and also from our distribution directory [2].
1: https://www.torproject.org/download/download-easy.html
2: https://www.torproject.org/dist/torbrowser/7.5.4/
This release features important security updates [3] to Firefox.
3: https://www.mozilla.org/en-US/security/advisories/mfsa2018-12/
This release updates Firefox to 52.8.0esr, HTTPS Everywhere to 2018.4.11,
and NoScript to 5.1.8.5. In addition, we exempt .onion domains from mixed
content warnings [4], fixed a fingerprinting issue and an issue with
localized content.
4: https://trac.torproject.org/projects/tor/ticket/23439
The full changelog since Tor Browser 7.5.3 is:
* All platforms
* Update Firefox to 52.8.0esr
* Update HTTPS Everywhere to 2018.4.11
* Update NoScript to 5.1.8.5
* Bug 23439: Exempt .onion domains from mixed content warnings
* Bug 22614: Make e10s/non-e10s Tor Browsers indistinguishable
* Bug 22659: Changes to `intl.accept.languages` get overwritten after restart
* Bug 25973: Backport off-by-one fix (bug 1352073)
* Bug 25020: Add a tbb_version.json file
