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[tor-talk] Tor 0.3.3.1-alpha is released!
Hi, all!
There's a new alpha Tor release! Because it's an alpha, you should
only run it if you're ready to find more bugs than usual, and report
them on trac.torproject.org.
The source code is available from the usual place on
www.torproject.org; if you build Tor from source, why not give it a
try? And if you don't build Tor from source, packages should be ready
over the coming days, with an alpha Tor Browser release likely some
time in February.
=====
Here's what's new!
Changes in version 0.3.3.1-alpha - 2018-01-25
Tor 0.3.3.1-alpha is the first release in the 0.3.3.x series. It adds
several new features to Tor, including several improvements to
bootstrapping, and support for an experimental "vanguards" feature to
resist guard discovery attacks. This series also includes better
support for applications that need to embed Tor or manage v3
onion services.
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 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 having IPv6 bootstrap and guard support.) Implements 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.
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 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 Major features (v3 onion services, ipv6):
- 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 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.
- 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 (relays):
- 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 feature (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 23827.
- When a consensus has IPv6 ORPorts, make IPv6-only clients use
them, rather than waiting to download microdescriptors.
Implements 23827.
o Minor features (cleanup):
- Tor now deletes the CookieAuthFile and ExtORPortCookieAuthFile
when it stops. Closes ticket 23271.
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 24001,
patch by "aruna1234".
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 (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 make a 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 (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 (log messages):
- 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, android):
- 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 (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 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 bugfix (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 (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.
- 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.
- 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 (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 (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 (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 (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 (performance, fragile-hardening):
- 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 (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 (testing):
- Give out Exit flags in bootstrapping networks. Fixes bug 24137;
bugfix on 0.2.3.1-alpha.
- Fix a memory leak in the scheduler/loop_kist unit test. Fixes bug
25005; bugfix on 0.3.2.7-rc.
o Code simplification and refactoring:
- 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:
- 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.
- Document that operators who run more than one relay or bridge are
expected to set MyFamily and ContactInfo correctly. Closes
ticket 24526.
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-size 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.
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