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@ -3,46 +3,68 @@ Changes in version 0.4.5.1-alpha - 2020-10-30
improves support for IPv6, address discovery and self-testing, code
metrics and tracing.
This release also fixes TROVE-2020-005, a security issue that could be
used, under certain cases, by an adversary to observe traffic patterns
on a limited number of circuits intended for a different relay. To
mount this attack, the adversary would need to actively extend
circuits to an incorrect address, as well as compromise a relay's
legacy RSA-1024 key. We'll be backporting this fix to other release
series soon, after it has had some testing.
Here are the changes since 0.4.4.5.
o Major features (build):
- When building Tor, first link all object files into a single
static library. This may help with embedding Tor in other
programs. Note that most Tor functions do not constitute a part of
a stable or supported API: Only those functions in tor_api.h
should be used if embedding Tor. Closes ticket 40127.
o Major features (metrics):
- Introduce a new MetricsPort which exposes, through an HTTP GET
/metrics request, a series of metrics that tor collects at
runtime. At the moment, the only supported output format is
Prometheus data model. Closes ticket 40063. See the manual page
for more information.
- Introduce a new MetricsPort which exposes, through an HTTP
interface, a series of metrics that tor collects at runtime. At
the moment, the only supported output format is Prometheus data
model. Closes ticket 40063. See the manual page for more
information and security considerations.
o Major features (relay, IPv6):
- The torrc option Address now supports IPv6. By doing so, we've
also unified the interface to find our address to support IPv4,
IPv6 and hostname. Closes ticket 33233.
- The torrc option Address now supports IPv6. This unifies our
address discovery interface to support IPv4, IPv6, and hostnames.
Closes ticket 33233.
- Launch IPv4 and IPv6 ORPort self-test circuits on relays and
bridges. Closes ticket 33222.
- Relays now automatically bind on IPv6 for their ORPort unless
- Relays now automatically bind on IPv6 for their ORPort, unless
specified otherwise with the IPv4Only flag. Closes ticket 33246.
- When a relay with IPv6 support opens a connection to another
relay, and the extend cell lists both IPv4 and IPv6 addresses, the
first relay now picks randomly which address to use. Closes
ticket 33220.
- Relays now track their IPv6 ORPort separately from the reachability
of their IPv4 ORPort. They will not publish a descriptor unless
_both_ ports appear to be externally reachable. Closes
ticket 34067.
- When a relay with IPv6 support is told to open a connection to
another relay, and the extend cell lists both IPv4 and IPv6
addresses, the first relay now picks randomly which address to
use. Closes ticket 33220.
- Relays now track their IPv6 ORPort reachability separately from
the reachability of their IPv4 ORPort. They will not publish a
descriptor unless _both_ ports appear to be externally reachable.
Closes ticket 34067.
o Major features (tracing):
- Add a tracing library with USDT and LTTng-UST support. Few
tracepoints were added in the circuit subsystem. More will come
incrementally. This feature is compiled out by default. It needs
- Add event-tracing library support for USDT and LTTng-UST, and a
few tracepoints in the circuit subsystem. More will come
incrementally. This feature is compiled out by default: it needs
to be enabled at configure time. See documentation in
doc/HACKING/Tracing.md. Closes ticket 32910.
o Major bugfix (TLS, buffer):
o Major bugfixes (security):
- When completing a channel, relays now check more thoroughly to
make sure that it matches any pending circuits before attaching
those circuits. Previously, address correctness and Ed25519
identities were not checked in this case, but only when extending
circuits on an existing channel. Fixes bug 40080; bugfix on
0.2.7.2-alpha. Resolves TROVE-2020-005.
o Major bugfixes (TLS, buffer):
- When attempting to read N bytes on a TLS connection, really try to
read those N bytes. Before that, Tor would stop reading after the
first TLS record which can be smaller than N bytes even though
more data was waiting on the TLS connection socket. The remaining
data would have been read at the next mainloop event. Fixes bug
40006; bugfix on 0.1.0.5-rc.
read all N bytes. Previously, Tor would stop reading after the
first TLS record, which can be smaller than the N bytes requested,
and not check for more data until the next mainloop event. Fixes
bug 40006; bugfix on 0.1.0.5-rc.
o Minor features (address discovery):
- If no Address statements are found, relays now prioritize guessing
@ -51,69 +73,65 @@ Changes in version 0.4.5.1-alpha - 2020-10-30
hostname is used. Closes ticket 33238.
o Minor features (admin tools):
- Add new --format argument to -key-expiration option to allow
specifying the time format of expiration date. Adds Unix timestamp
format support. Patch by Daniel Pinto. Closes ticket 30045.
- Add a new --format argument to -key-expiration option to allow
specifying the time format of the expiration date. Adds Unix
timestamp format support. Patch by Daniel Pinto. Closes
ticket 30045.
o Minor features (bootstrap reporting):
- When reporting bootstrapping status on a relay, do not consider
connections that have never been the target of an origin circuit.
Previously, all connection failures were treated as potential
bootstrapping failures, including those that had been opened
bootstrapping failures, including connections had been opened
because of client requests. Closes ticket 25061.
o Minor features (build):
- When running the configure script, try to detect version
mismatches between the OpenSSL headers and libraries, and suggest
that the user should try "--with-openssl-dir". Closes 40138.
- If the configure script has given any warnings, remind the user
about them at the end of the script. Related to 40138.
- When running the configure script, try to detect version
mismatches between the openssl headers and libraries, and suggest
that the user should try "--with-openssl-dir". Closes 40138.
- When building Tor, first link all object files into a single
static library. This may help with embedding Tor in other
programs. Note that most Tor functions do not constitute a part of
a stable or supported API: Only those functions in tor_api.h
should be used if embedding Tor. Closes ticket 40127.
o Minor features (configuration):
- Allow the using wildcards (* and ?) with the %include option on
configuration files. Closes ticket 25140. Patch by Daniel Pinto.
- Allows configuration options EntryNodes, ExcludeNodes,
- Allow the configuration options EntryNodes, ExcludeNodes,
ExcludeExitNodes, ExitNodes, MiddleNodes, HSLayer2Nodes and
HSLayer3Nodes to be specified multiple times. Closes ticket 28361.
Patch by Daniel Pinto.
o Minor features (control port):
- Add a DROPTIMEOUTS control port command to drop circuit build
timeout history and reset the timeout. Closes ticket 40002.
- Add a DROPTIMEOUTS command to drop circuit build timeout history
and reset the current timeout. Closes ticket 40002.
- When a stream enters the AP_CONN_STATE_CONTROLLER_WAIT status,
send a control port event CONTROLLER_WAIT. Closes ticket 32190.
Patch by Neel Chauhan.
- Introduce "GETINFO address/v4" and "GETINFO address/v6" in the
control port to fetch the Tor host's respective IPv4 or IPv6
address. We keep "GETINFO address" for backwords-compatibility
which retains the current behavior. Closes ticket 40039. Patch by
send a control port event. Closes ticket 32190. Patch by
Neel Chauhan.
- Introduce GETINFO "stats/ntor/{assigned/requested}" and
"stats/tap/{assigned/requested}" to get the NTorand TAP circuit
onion handshake rephist values respectively. Closes ticket 28279.
Patch by Neel Chauhan.
"stats/tap/{assigned/requested}" to get the NTor and TAP circuit
onion handshake counts respectively. Closes ticket 28279. Patch by
Neel Chauhan.
o Minor features (controller, IPv6):
o Minor features (control port, IPv6):
- Tor relays now try to report to the controller when they are
launching an IPv6 self-test. Closes ticket 34068.
- Introduce "GETINFO address/v4" and "GETINFO address/v6" in the
control port to fetch the Tor host's respective IPv4 or IPv6
address. We keep "GETINFO address" for backwards-compatibility.
Closes ticket 40039. Patch by Neel Chauhan.
o Minor features (directory authorities):
- Authorities now list a different set of protocols as required and
recommended. These lists are chosen so that only truly recommended
and/or required protocols are included, and so that clients using
0.2.9 or later will continue to work (even though they are not
supported), whereas only relays running 0.3.5 or later will meet
the requirements. Closes ticket 40162.
- Add a new consensus method that removes the unecessary = padding
from ntor-onion-key. Closes ticket 7869. Patch by Daniel Pinto.
recommended. These lists have been chosen so that only truly
recommended and/or required protocols are included, and so that
clients using 0.2.9 or later will continue to work (even though
they are not supported), whereas only relays running 0.3.5 or
later will meet the requirements. Closes ticket 40162.
- Add a new consensus method 30 that removes the unnecessary "="
padding from ntor-onion-key. Closes ticket 7869. Patch by
Daniel Pinto.
- Directory authorities now reject descriptors from relays running
Tor versions from the 0.4.1 series, but still allow the 0.3.5
series. Resolves ticket 34357. Patch by Neel Chauhan.
Tor versions from the obsolete 0.4.1 series. Resolves ticket
34357. Patch by Neel Chauhan.
- Make it possible to specify multiple ConsensusParams torrc lines.
Now directory authority operators can for example put the main
ConsensusParams config in one torrc file and then add to it from a
@ -122,16 +140,15 @@ Changes in version 0.4.5.1-alpha - 2020-10-30
from checking whether other relays are running. A new
AuthDirTestReachability option can be used to disable these
checks. Closes ticket 34445.
- When looking for possible sybil attacks, also consider IPv6
- When looking for possible Sybil attacks, also consider IPv6
addresses. Two routers are considered to have "the same" address
by this metric if they are in the same /64 network. Patch from
Maurice Pibouin. Closes ticket 7193.
o Minor features (directory authorities, IPv6):
- Make authorities add their IPv6 ORPort (if any) to the trusted dir
servers list. Authorities currently add themselves to the trusted
dir servers list, but they only add their IPv4 address and ports
to the list. Closes ticket 32822.
- Make authorities add their IPv6 ORPort (if any) to the trusted
servers list. Authorities previously added only their IPv4
addresses. Closes ticket 32822.
o Minor features (ed25519, relay):
- Save a relay's base64-encoded ed25519 identity key to the data
@ -140,54 +157,40 @@ Changes in version 0.4.5.1-alpha - 2020-10-30
o Minor features (heartbeat):
- Include the total number of inbound and outbound IPv4 and IPv6
connections in the heartbeat message . Closes ticket 29113.
connections in the heartbeat message. Closes ticket 29113.
o Minor features (IPv6, ExcludeNodes):
- Make routerset_contains_router() capable of handling IPv6
addresses. This makes ExcludeNodes capable of excluding an IPv6
adddress. Previously, ExcludeNodes ignored IPv6 addresses. Closes
ticket 34065. Patch by Neel Chauhan.
- Handle IPv6 addresses in ExcludeNodes; previously they were
ignored. Closes ticket 34065. Patch by Neel Chauhan.
o Minor features (logging):
- Adds the running glibc version to the log. Also adds the running
and compiled glibc version to the library list returned when using
the flag --library-versions. Patch from Daniel Pinto. Closes
ticket 40047; bugfix on 0.4.5.0-alpha-dev.
- Consider an HTTP 301 response as an error (like a 404) when
processing the response to a request for a group of server
descriptors or an extrainfo documents. Closes ticket 40053.
- Print directory fetch information a single line. Closes
ticket 40159.
- Add the running glibc version to the log, and the compiled glibc
version to the library list returned when using --library-versions.
Patch from Daniel Pinto. Closes ticket 40047.
- Consider an HTTP 301 response to be an error (like a 404) when
processing a directory response. Closes ticket 40053.
- Log directory fetch statistics a single line. Closes ticket 40159.
- Provide more complete descriptions of our connections when logging
about them. Closes ticket 40041.
- When describing a relay in th elogs, we now include its ed25519
- When describing a relay in the logs, we now include its ed25519
identity. Closes ticket 22668.
o Minor features (onion services):
- When writing an onion service hostname file, first read it to make
sure it contains what we want before attempting to write it. Now
onion services can set their existing onion service directories to
read-only and Tor will still work. Resolves ticket 40062. Patch by
Neel Chauhan.
- Only overwrite an onion service's existing hostname file if its
contents are wrong. This enables read-only onion-service
directories. Resolves ticket 40062. Patch by Neel Chauhan.
o Minor features (pluggable transports):
- Added option OutboundBindAddressPT to torrc. This option allows
users to specify which IPv4 and IPv6 address they want pluggable
transports to use for outgoing IP packets. Tor does not have a way
to enforce that the pluggable transport honors this option so each
pluggable transport will have to implement support for this
feature. Closes ticket 5304.
o Minor features (protocol simplification):
- Tor no longer allows subprotocol versions larger than 63.
Previously versions up to UINT32_MAX were allowed, which
significantly complicated our code. Implements proposal 318;
closes ticket 40133.
- Add an OutboundBindAddressPT option to allow users to specify
which IPv4 and IPv6 address pluggable transports should use for
outgoing IP packets. Tor does not have a way to enforce that the
pluggable transport honors this option, so each pluggable transport
needs to implement support on its own. Closes ticket 5304.
o Minor features (relay address tracking):
- We store relay addresses for OR connections in a more logical way.
Previously we would sometimes overwrite the actual address of a
connection with a "canonical address", and then store the "real
- We now store relay addresses for OR connections in a more logical
way. Previously we would sometimes overwrite the actual address of
a connection with a "canonical address", and then store the "real
address" elsewhere to remember it. We now track the "canonical
address" elsewhere for the cases where we need it, and leave the
connection's address alone. Closes ticket 33898.
@ -201,16 +204,17 @@ Changes in version 0.4.5.1-alpha - 2020-10-30
Closes ticket 34137.
o Minor features (relay, address discovery):
- If Address is not found in torrc, attempt to learn our address
with the configured ORPort address if any. Closes ticket 33236.
- If Address option is not found in torrc, attempt to learn our
address with the configured ORPort address if any. Closes
ticket 33236.
o Minor features (relay, IPv6):
- Add an AssumeReachableIPv6 option to disable self-checking IPv6
reachability. Closes part of ticket 33224.
- Add new "assume-reachable" and "assume-reachable-ipv6" parameters
to be used in an emergency to tell relays that they should publish
even if they cannot complete their ORPort self-checks. Closes
ticket 34064 and part of 33224.
- Add new "assume-reachable" and "assume-reachable-ipv6" consensus
parameters to be used in an emergency to tell relays that they
should publish even if they cannot complete their ORPort self-
checks. Closes ticket 34064 and part of 33224.
- Allow relays to send IPv6-only extend cells. Closes ticket 33222.
- Declare support for the Relay=3 subprotocol version. Closes
ticket 33226.
@ -226,8 +230,8 @@ Changes in version 0.4.5.1-alpha - 2020-10-30
- When loading the state file, remove entries from the statefile
that have been obsolete for a long time. Ordinarily Tor preserves
unrecognized entries in order to keep forward-compatibility, but
these statefile entries have not actually been used in any release
since before the 0.3.5.x. Closes ticket 40137.
these entries have not actually been used in any release since
before the 0.3.5.x. Closes ticket 40137.
o Minor features (statistics, ipv6):
- Relays now publish IPv6-specific counts of single-direction versus
@ -236,26 +240,30 @@ Changes in version 0.4.5.1-alpha - 2020-10-30
if statistics are enabled. Closes ticket 33263.
o Minor features (subprotocol versions):
- Tor no longer allows subprotocol versions larger than 63.
Previously version numbers up to UINT32_MAX were allowed, which
significantly complicated our code. Implements proposal 318;
closes ticket 40133.
- Use the new limitations on subprotocol versions due to proposal
318 to simplify our implementation. Part of ticket 40133.
o Minor features (testing configuration):
- The TestingTorNetwork no longer implicitly sets AssumeReachable to
1. This change will allow us to test relays' self-testing
mechanisms, and eventually to test authorities' relay-testing
- The TestingTorNetwork option no longer implicitly sets
AssumeReachable to 1. This change allows us to test relays' self-
testing mechanisms, and to test authorities' relay-testing
functionality. Closes ticket 34446.
o Minor features (testing):
- Added unit tests for channel_matches_target_addr_for_extend().
Closes Ticket 33919. Patch by MrSquanchee.
o Minor bugfixes (security):
- When completing a channel, relays now check more thoroughly to
make sure that it matches any pending circuits before attaching
those circuits. Previously, address correctness and Ed25519
identities were not checked in this case, but only when extending
circuits on an existing channel. Fixes bug 40080; bugfix
on 0.2.7.2-alpha.
o Minor features (tests, v2 onion services):
- Fix a rendezvous cache unit test that was triggering an underflow
on the global rend cache allocation. Fixes bug 40125; bugfix
on 0.2.8.1-alpha.
- Fix another rendezvous cache unit test that was triggering an
underflow on the global rend cache allocation. Fixes bug 40126;
bugfix on 0.2.8.1-alpha.
o Minor bugfixes (circuit padding):
- When circpad_send_padding_cell_for_callback is called,
@ -265,7 +273,7 @@ Changes in version 0.4.5.1-alpha - 2020-10-30
- Add a per-circuit padding machine instance counter, so we can
differentiate between shutdown requests for old machines on a
circuit; Fixes bug 30992; bugfix on 0.4.1.1-alpha.
- Add the abilility to keep circuit padding machines if they match a
- Add the ability to keep circuit padding machines if they match a
set of circuit state or purposes. This allows us to have machines
that start up under some conditions but don't shut down under
others. We now use this mask to avoid starting up introduction
@ -293,6 +301,12 @@ Changes in version 0.4.5.1-alpha - 2020-10-30
2.19. Fixes bug 40141; bugfix on 0.4.5.0-alpha-dev. Patch by
Daniel Pinto.
o Minor bugfixes (control port):
- Make sure we send the SOCKS request address in relay begin cells
when a stream is attached with the purpose
CIRCUIT_PURPOSE_CONTROLLER. Fixes bug 33124; bugfix on 0.0.5.
Patch by Neel Chauhan.
o Minor bugfixes (logging):
- Remove a debug logging statement that uselessly spam the logs.
Fixes bug 40135; bugfix on 0.3.5.0-alpha.
@ -303,10 +317,6 @@ Changes in version 0.4.5.1-alpha - 2020-10-30
messages started to occur. Fixes bug 19431; bugfix
on 0.2.2.16-alpha.
o Minor bugfixes (protover):
- Consistently reject extra commas, instead of only rejecting
leading commas. Fixes bug 27194; bugfix on 0.2.9.4-alpha.
o Minor bugfixes (relay configuration, crash):
- Avoid a fatal assert() when failing to create a listener
connection for an address that was in use. Fixes bug 40073; bugfix
@ -314,11 +324,11 @@ Changes in version 0.4.5.1-alpha - 2020-10-30
o Minor bugfixes (rust, protocol versions):
- Declare support for the onion service introduction point denial of
service extensions, when building tor with Rust. Fixes bug 34248;
service extensions when building with Rust. Fixes bug 34248;
bugfix on 0.4.2.1-alpha.
- Make Rust protocol version support checks consistent with the
undocumented error behaviour of the corresponding C code. Fixes
bug 34251; bugfix on 0.3.3.5-rc.
undocumented error behavior of the corresponding C code. Fixes bug
34251; bugfix on 0.3.3.5-rc.
o Minor bugfixes (self-testing):
- When receiving an incoming circuit, only accept it as evidence
@ -327,17 +337,13 @@ Changes in version 0.4.5.1-alpha - 2020-10-30
evidence that we're reachable on some other address. Fixes bug
20165; bugfix on 0.1.0.1-rc.
o Minor bugfixes (SOCKS, onion services):
- Make sure we send the SOCKS request address in relay begin cells
when a stream is attached with the purpose
CIRCUIT_PURPOSE_CONTROLLER. Fixes bug 33124; bugfix on 0.0.5.
Patch by Neel Chauhan.
o Minor bugfixes (spec conformance):
- Use the correct key type when generating signing->link
certificates. Fixes bug 40124; bugfix on 0.2.7.2-alpha.
o Minor bugfixes (string handling):
o Minor bugfixes (subprotocol versions):
- Consistently reject extra commas, instead of only rejecting
leading commas. Fixes bug 27194; bugfix on 0.2.9.4-alpha.
- In summarize_protover_flags(), treat empty strings the same as
NULL. This prevents protocols_known from being set. Previously, we
treated empty strings as normal strings, which led to
@ -346,13 +352,11 @@ Changes in version 0.4.5.1-alpha - 2020-10-30
o Minor bugfixes (v2 onion services):
- For HSFETCH commands on v2 onion services addresses, check the
length of bytes decoded, not the base32 length. This takes the
behavior introduced in commit
a517daa56f5848d25ba79617a1a7b82ed2b0a7c0 into consideration. Fixes
bug 34400; bugfix on 0.4.1.1-alpha. Patch by Neel Chauhan.
length of bytes decoded, not the base32 length. Fixes bug 34400;
bugfix on 0.4.1.1-alpha. Patch by Neel Chauhan.
o Code simplification and refactoring:
- Add and use a set of functions to perform downcasts on constant
- Add and use a set of functions to perform down-casts on constant
connection and channel pointers. Closes ticket 40046.
- Refactor our code that logs a descriptions of connections,
channels, and the peers on them, to use a single call path. This
@ -421,10 +425,8 @@ Changes in version 0.4.5.1-alpha - 2020-10-30
so we can properly integrate IPv6 along IPv4 with common
interfaces. Closes ticket 40043.
o Documentation (manpages):
- Move them from doc/ to doc/man/. Closes ticket 40044.
o Documentation (manual page):
- Move them from doc/ to doc/man/. Closes ticket 40044.
- Describe the status of the "Sandbox" option more accurately. It is
no longer "experimental", but it _is_ dependent on kernel and libc
versions. Closes ticket 23378.
@ -433,17 +435,6 @@ Changes in version 0.4.5.1-alpha - 2020-10-30
- Document in depth the circuit subsystem trace events in the new
doc/tracing/EventsCircuit.md. Closes ticket 40036.
o Testing (CI):
- Build tracing configure option into our CI. Closes ticket 40038.
o Testing (onion service v2):
- Fix a rendezvous cache unit test that was triggering an underflow
on the global rend cache allocation. Fixes bug 40125; bugfix
on 0.2.8.1-alpha.
- Fix another rendezvous cache unit test that was triggering an
underflow on the global rend cache allocation. Fixes bug 40126;
bugfix on 0.2.8.1-alpha.
Changes in version 0.4.4.5 - 2020-09-15
Tor 0.4.4.5 is the first stable release in the 0.4.4.x series. This