We found this in #40076, after we started using buf_move_all() in
more places. Fixes bug #40076; bugfix on 0.3.3.1-alpha. As far as
I know, the crash only affects master, but I think this warrants a
backport, "just in case".
Without this fix, if an PT forgets to send a USERADDR command, that
results in a connection getting treated as local for the purposes of
rate-limiting.
If the PT _does_ use USERADDR, we still believe it.
Closes ticket 33747.
Previously we tolerated up to 1.5 connections for every relay we
were connected to, and didn't warn if we had fewer than 5
connections total.
Now we tolerate up to 1.5 connections per relay, and up to 4
connections per authority, and we don't warn at all when we have
fewer than 25 connections total.
Fixes bug 33880, which seems to have been provoked by our #17592
change in 0.3.5.
The need for casting negative syscall arguments depends on the
glibc version. This affects the rules for the openat syscall which
uses the constant AT_FDCWD that is defined as a negative number.
This commit adds logic to only apply the cast when necessary, on
glibc versions from 2.27 onwards.
Different versions of glibc use either open or openat for the
opendir function. This commit adds logic to use the correct rule
for each glibc version, namely:
- Until 2.14 open is used
- From 2.15 to to 2.21 openat is used
- From 2.22 to 2.26 open is used
- From 2.27 onwards openat is used
The need for casting negative syscall arguments depends on the
glibc version. This affects the rules for the openat syscall which
uses the constant AT_FDCWD that is defined as a negative number.
This commit adds logic to only apply the cast when necessary, on
glibc versions from 2.27 onwards.
check-cocci is still a good idea -- perhaps as a cron job? But
doing it as part of our regular tests has just been confusing,
especially to volunteers who shouldn't have to become coccinelle
experts in order to get their patches through our CI.
Closes#40030.
When receiving an introduction NACK, the client either decides to close or
re-extend the circuit to another intro point.
In order to do this, the service descriptor needs to exists but it is possible
that it gets removed from the cache between the establishement of the
introduction circuit and the reception of the (N)ACK.
For that reason, the BUG(desc == NULL) is removed because it is a possible
normal use case. Tor recovers gracefully already.
Fixes#34087
Signed-off-by: David Goulet <dgoulet@torproject.org>
This commit modifies the behavior of `parse_extended_address` in such a way
that if it fails, it will always return a `BAD_HOSTNAME` value, which is then
used to return the 0xF6 extended error code. This way, in any case that is
not a valid v2 address, we return the 0xF6 error code, which is the expected
behavior.
Signed-off-by: David Goulet <dgoulet@torproject.org>
This reverts commit bf2a399fc0.
Don't set by default the prefer IPv6 feature on client ports because it breaks
the torsocks use case. The SOCKS resolve command is lacking a mechanism to ask
for a specific address family (v4 or v6) thus prioritizing IPv6 when an IPv4
address is asked on the resolve SOCKS interface resulting in a failure.
Tor Browser explicitly set PreferIPv6 so this should not affect the majority
of our users.
Closes#33796
Signed-off-by: David Goulet <dgoulet@torproject.org>
For some reasons, Appveyor started to use the stdio printf format for 64 bit
values (PRIu64, ...). Mingw doesn't like that so force it to use the Windows
specific macros by setting D__USE_MINGW_ANSI_STDIO=0.
Fixes#40026
This patch fixes an out-of-bound memory read in
`tor_tls_cert_matches_key()` when Tor is compiled to use Mozilla's NSS
instead of OpenSSL.
The NSS library stores some length fields in bits instead of bytes, but
the comparison function found in `SECITEM_ItemsAreEqual()` needs the
length to be encoded in bytes. This means that for a 140-byte,
DER-encoded, SubjectPublicKeyInfo struct (with a 1024-bit RSA public key
in it), we would ask `SECITEM_ItemsAreEqual()` to compare the first 1120
bytes instead of 140 (140bytes * 8bits = 1120bits).
This patch fixes the issue by converting from bits to bytes before
calling `SECITEM_ItemsAreEqual()` and convert the `len`-fields back to
bits before we leave the function.
This patch is part of the fix for TROVE-2020-001.
See: https://bugs.torproject.org/33119
If at least one service is configured as a version 2, a log warning is emitted
once and only once.
Closes#40003
Signed-off-by: David Goulet <dgoulet@torproject.org>
This is not actually a bug! It can happen for a bunch of reasons,
which all boil down to "trying to add an extrainfo for which we no
longer have the corresponding routerinfo".
Fixes#16016; bugfix on 0.2.6.3-alpha.
Since Tor 0.2.9 has been unsupported since January, 0.3.5 is the
oldest supported version, and its features constitute the oldest
recommended feature-set.
This patch updates these recommendations:
DirCache=2
Support for consensus diffs.
New in 0.3.1.1-alpha.
HSDir=2
Support for v3 onion service descriptors.
New in 0.3.0.4-alpha.
HSIntro=4
Support for Ed25519 intropoint authentication keys.
New in 0.3.0-4-alpha.
HSRend=2
Support for rendezvous cells longer than 20 bytes.
New in 0.2.9.4-alpha.
Link=5
Link padding and link padding negotiation.
New in 0.3.3.2-alpha.
LinkAuth=3
Ed25519 link authentication.
New in 0.3.0.1-alpha.
M_SYSCALL is used to report information about a sandbox violation,
but when we don't have a definition for it, it still makes sense to
compile.
Closes ticket 34382.
Resume being willing to use preemptively-built circuits when
UseEntryGuards is set to 0. We accidentally disabled this feature with
that config setting (in our fix for #24469), leading to slower load times.
Fixes bug 34303; bugfix on 0.3.3.2-alpha.
... and DISABLE_ASSERTS_IN_UNIT_TESTS.
Make all of tor's assertion macros support the ALL_BUGS_ARE_FATAL and
DISABLE_ASSERTS_IN_UNIT_TESTS debugging modes.
Implements these modes for IF_BUG_ONCE(). (It used to log a non-fatal
warning, regardless of the debugging mode.)
Fixes bug 33917; bugfix on 0.2.9.1-alpha.
Allow clients and relays to send dual-stack and IPv6-only EXTEND2 cells.
Parse dual-stack and IPv6-only EXTEND2 cells on relays.
Relays do not make connections or extend circuits via IPv6: that's the
next step.
Closes ticket 33901.
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.
(The port is replaced with the IPv6 ORPort from the consensus, we will
resolve this issue in 33898.)
Fixes bug 33899; bugfix on 0.3.1.1-alpha.
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.
The client auth protocol allows attacker-controlled x25519 private keys being
passed around, which allows an attacker to potentially trigger the all-zeroes
assert for client_auth_sk in hs_descriptor.c:decrypt_descriptor_cookie().
We fixed that by making sure that an all-zeroes client auth key will not be
used.
There are no guidelines for validating x25519 private keys, and the assert was
there as a sanity check for code flow issues (we don't want to enter that
function with an unitialized key if client auth is being used). To avoid such
crashes in the future, we also changed the assert to a BUG-and-err.
This change broke torsocks that by default is expecting an IPv4 for hostname
resolution because it can't ask tor for a specific IP version with the SOCKS5
extension.
PreferIPv6 made it that sometimes the IPv6 could be returned to torsocks that
was expecting an IPv4.
Torsocks is probably a very unique case because the runtime flow is that it
hijacks DNS resolution (ex: getaddrinfo()), gets an IP and then sends it back
for the connect() to happen.
The libc has DNS resolution functions that allows the caller to request a
specific INET family but torsocks can't tell tor to resolve the hostname only
to an IPv4 or IPv6 and thus by default fallsback to IPv4.
Reverting this change into 0.4.3.x series but we'll keep it in the 0.4.4.x
series in the hope that we add this SOCKS5 extension to tor for DNS resolution
and then change torsocks to use that.
Fixes#33804
Signed-off-by: David Goulet <dgoulet@torproject.org>
