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Changes in version 0.2.9.3-alpha - 2016-09-2?
Tor 0.2.9.3-alpha adds improved support for entities that
want to make high-performance services available through the Tor .onion
mechanism without themselves receiving anonymity as they host those
services. It also tries harder to ensure that all steps on a circuit are
using the strongest crypto possible, strengthens some TLS properties, and
resolves several bugs -- including a pair of crash bugs from the 0.2.8
series. Anybody running an earlier version of 0.2.9.x should upgrade.
XXXXX Add items from the 0.2.8.8 changelog.
o Major features (circuit building, security):
- Authorities, relays and clients specifically check that each
descriptor has an ntor key.
- Circuit-building code assumes that all hops can use ntor,
except for rare hidden service protocol cases.
- Client code never chooses nodes without ntor keys: they will not
be selected during circuit-building, or as guards, or as directory
mirrors, or as introduction or rendezvous points.
- Clients avoid downloading a descriptor if the relay version is
too old to support ntor.
- Tor authorities, relays, and clients only use ntor, except for
rare cases in the hidden service protocol.
o Major features (onion services):
- Add experimental HiddenServiceSingleHopMode and
HiddenServiceNonAnonymousMode options. When both are set to 1, every
hidden service on a tor instance becomes a non-anonymous Single Onion
Service. Single Onions make one-hop (direct) connections to their
introduction and renzedvous 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 (resource management):
- Tor now includes support for noticing when we are about to run out of
sockets, and preemptively closing connections of lower priority.
(This feature is off by default for now, since the current prioritizing
method is not mature enough yet. You can enable it by setting
"DisableOOSCheck 0".) Closes ticket 18640.
o Major bugfixes (circuit building):
- Hidden service client-to-intro-point and service-to-rendezvous-point
cicruitss 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 (compilation, OpenBSD):
- Fix a Libevent-detection bug in our autoconf script that would
prevent Tor from linking successfully on OpenBSD. Patch from
rubiate. Fixes bug 19902; bugfix on 0.2.9.1-alpha.
o Major bugfixes (hidden services):
- Clients 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 discover which
consensus a client has.
Fixes bug 20012; bugfix on 0.2.4.8-alpha. Patch by teor.
o Minor feature (port flags):
- Add *Port flags NoDNSRequest and NoOnionTraffic, and
the synthetic flag OnionTrafficOnly, which is equivalent to
NoDNSRequest, NoIPv4Traffic, and NoIPv6Traffic.
Closes enhancement 18693; patch by "teor".
o Minor features (testing, ipv6):
- 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 flavours (git c72a652 or later).
Closes ticket 20072; patch by teor.
- 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.
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.
o Minor features (security, TLS):
- Servers no longer support clients that do not provide AES
ciphersuites. (3DES is no longer considered an acceptable
cipher.) We believe that no such clients currently exist,
since we have required OpenSSL 0.9.7 or later since 2009.
Closes ticket 19998.
o Minor features (testing):
- Disable memory protections on OpenBSD when testing memwipe().
The test deliberately invokes undefined behaviour which the
protections interfere with. Patch from "rubiate". Closes ticket
20066.
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 (unit tests):
- 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 or --notice --warn to the "test" binary). This
change will prevent 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. 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 bug fixes (circuits):
- Use CircuitBuildTimeout whenever LearnCircuitBuildTimeout is disabled.
Fixes bug 19678; bugfix on commit 5b0b51ca3 in 0.2.4.12-alpha. Patch by teor.
o Minor bugfixes (options):
- Check the consistency of UseEntryGuards and EntryNodes more reliably.
Fixes bug 20074; bugfix on commit 686aaa5c in tor-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 tor-0.1.1.16-rc and
acda1735 in tor-0.2.4.3-alpha. Patch by teor.
o Minor bugfixes (Tor2web):
- Prevent Tor2web clients running hidden services, these services are
not anonymous due to the one-hop client paths.
Fixes bug 19678. Patch by teor.
o Minor bugfixes (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.
- Always include orconfig.h before including any other C headers.
Sometimes, it includes macros that affect the behavior of the
standard headers. Fixes bug 19767; bugfix on 0.2.9.1-alpha (the first
version to use AC_USE_SYSTEM_EXTENSIONS).
- Fix a syntax error in the IF_BUG_ONCE__() macro in non-
GCC-compatible compilers. Fixes bug 20141; bugfix on
0.2.9.1-alpha. Patch from Gisle Vanem.
- Stop trying to build with Clang 4.0's -Wthread-safety
warnings. They apparently require a set of annotations that we
aren't currently using, and they create false positives in our
pthreads wrappers. Fixes bug 20110; bugfix on 0.2.9.1-alpha.
o Minor bugfixes (directory authority):
- Die with a 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.
o Minor bugfixes (documentation):
- 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 02c320916e02 in tor-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!).
o Minor bugfixes (hidden services):
- 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.
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.
Fixes bug 20063; bugfix on 0.2.5.1-alpha.
o Minor bugfixes (logging):
- When logging a message from the BUG() macro, be explicit about what
we were asserting. Previously we were confusing what we were asserting
with what the bug was. Fixes bug 20093; bugfix on 0.2.9.1-alpha.
- 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 (option parsing):
- Count unix sockets when counting client listeners (SOCKS, Trans,
NATD, and DNS). This has no user-visible behaviour changes: these
options are set once, and never read.
Required for correct behaviour in ticket 17178.
Fixes bug 19677; bugfix on 0.2.6.3-alpha. Patch by teor.
o Minor bugfixes (unit tests):
- Fix shared random unit test that was failing on big endian architecture
due to internal representation of a integer copied to a buffer. The test
is changed to take a full 32 bytes of data and use the output of a
python script that make the COMMIT and REVEAL calculation according to
the spec. Fixes bug 19977; bugfix on tor-0.2.9.1-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.
Changes in version 0.2.9.2-alpha - 2016-08-24
Tor 0.2.9.2-alpha continues development of the 0.2.9 series with
several new features and bugfixes. It also includes an important