2 This document summarizes new features and bugfixes in each stable release
3 of Tor. If you want to see more detailed descriptions of the changes in
4 each development snapshot, see the ChangeLog file.
6 Changes in version 0.2.5.? - 2014-10-??
7 o Major features (security):
8 - If you don't specify MaxMemInQueues yourself, Tor now tries to
9 pick a good value based on your total system memory. Previously,
10 the default was always 8 GB. You can still override the default by
11 setting MaxMemInQueues yourself. Resolves ticket 11396.
13 o Major features (relay performance):
14 - Speed up server-side lookups of rendezvous and introduction point
15 circuits by using hashtables instead of linear searches. These
16 functions previously accounted between 3 and 7% of CPU usage on
17 some busy relays. Resolves ticket 9841.
18 - Avoid wasting CPU when extending a circuit over a channel that is
19 nearly out of circuit IDs. Previously, we would do a linear scan
20 over possible circuit IDs before finding one or deciding that we
21 had exhausted our possibilities. Now, we try at most 64 random
22 circuit IDs before deciding that we probably won't succeed. Fixes
23 a possible root cause of ticket 11553.
25 o Major features (relay security, DoS-resistance):
26 - When deciding whether we have run out of memory and we need to
27 close circuits, also consider memory allocated in buffers for
28 streams attached to each circuit.
30 This change, which extends an anti-DoS feature introduced in
31 0.2.4.13-alpha and improved in 0.2.4.14-alpha, lets Tor exit relays
32 better resist more memory-based DoS attacks than before. Since the
33 MaxMemInCellQueues option now applies to all queues, it is renamed
34 to MaxMemInQueues. This feature fixes bug 10169.
35 - Avoid hash-flooding denial-of-service attacks by using the secure
36 SipHash-2-4 hash function for our hashtables. Without this
37 feature, an attacker could degrade performance of a targeted
38 client or server by flooding their data structures with a large
39 number of entries to be stored at the same hash table position,
40 thereby slowing down the Tor instance. With this feature, hash
41 table positions are derived from a randomized cryptographic key,
42 and an attacker cannot predict which entries will collide. Closes
45 o Major features (bridges):
46 - Don't launch pluggable transport proxies if we don't have any
47 bridges configured that would use them. Now we can list many
48 pluggable transports, and Tor will dynamically start one when it
49 hears a bridge address that needs it. Resolves ticket 5018.
50 - The bridge directory authority now assigns status flags (Stable,
51 Guard, etc) to bridges based on thresholds calculated over all
52 Running bridges. Now bridgedb can finally make use of its features
53 to e.g. include at least one Stable bridge in its answers. Fixes
56 o Major features (other):
57 - Extend ORCONN controller event to include an "ID" parameter,
58 and add four new controller event types CONN_BW, CIRC_BW,
59 CELL_STATS, and TB_EMPTY that show connection and circuit usage.
60 The new events are emitted in private Tor networks only, with the
61 goal of being able to better track performance and load during
62 full-network simulations. Implements proposal 218 and ticket 7359.
63 - On some platforms (currently: recent OSX versions, glibc-based
64 platforms that support the ELF format, and a few other
65 Unix-like operating systems), Tor can now dump stack traces
66 when a crash occurs or an assertion fails. By default, traces
67 are dumped to stderr (if possible) and to any logs that are
68 reporting errors. Implements ticket 9299.
70 o Major features (seccomp2 sandbox, Linux only):
71 - Use the seccomp2 syscall filtering facility on Linux to limit
72 which system calls Tor can invoke. This is an experimental,
73 Linux-only feature to provide defense-in-depth against unknown
74 attacks. To try turning it on, set "Sandbox 1" in your torrc
75 file. Please be ready to report bugs. We hope to add support
76 for better sandboxing in the future, including more fine-grained
77 filters, better division of responsibility, and support for more
78 platforms. This work has been done by Cristian-Matei Toader for
79 Google Summer of Code. Resolves tickets 11351 and 11465.
81 o Major features (other):
82 - Add support for passing arguments to managed pluggable transport
83 proxies. Implements ticket 3594.
84 - Bridges now track GeoIP information and the number of their users
85 even when pluggable transports are in use, and report usage
86 statistics in their extra-info descriptors. Resolves tickets 4773
88 - Make testing Tor networks bootstrap better: lower directory fetch
89 retry schedules and maximum interval without directory requests,
90 and raise maximum download tries. Implements ticket 6752.
91 - Add make target 'test-network' to run tests on a Chutney network.
92 Implements ticket 8530.
93 - The ntor handshake is now on-by-default, no matter what the
94 directory authorities recommend. Implements ticket 8561.
99 o Major security fixes:
100 - Disable support for SSLv3. All versions of OpenSSL in use with Tor
101 today support TLS 1.0 or later, so we can safely turn off support
102 for this old (and insecure) protocol. Fixes bug 13426.
105 - Disable the sandbox name resolver cache when running tor-resolve:
106 tor-resolve doesn't use the sandbox code, and turning it on was
107 breaking attempts to do tor-resolve on a non-default server on
108 Linux. Fixes bug 13295; bugfix on 0.2.5.3-alpha.
111 - Build and run correctly on systems like OpenBSD-current that have
112 patched OpenSSL to remove get_cipher_by_char and/or its
113 implementations. Fixes issue 13325.
115 o Downgraded warnings:
116 - Downgrade the severity of the 'unexpected sendme cell from client'
117 from 'warn' to 'protocol warning'. Closes ticket 8093.
121 o Major bugfixes (client, startup):
122 - Warn about attempts to run hidden services and relays in the same
123 process: that's probably not a good idea. Closes ticket 12908.
125 o Major bugfixes (relay):
126 - Avoid queuing or sending destroy cells for circuit ID zero when we
127 fail to send a CREATE cell. Fixes bug 12848; bugfix on 0.0.8pre1.
128 Found and fixed by "cypherpunks".
129 - Fix ORPort reachability detection on relays running behind a
130 proxy, by correctly updating the "local" mark on the controlling
131 channel when changing the address of an or_connection_t after the
132 handshake. Fixes bug 12160; bugfix on 0.2.4.4-alpha.
135 - Perform circuit cleanup operations even when circuit
136 construction operations are disabled (because the network is
137 disabled, or because there isn't enough directory information).
138 Previously, when we were not building predictive circuits, we
139 were not closing expired circuits either. Fixes bug 8387; bugfix on
140 0.1.1.11-alpha. This bug became visible in 0.2.4.10-alpha when we
141 became more strict about when we have "enough directory information
144 o Major bugfixes (security, directory authorities):
145 - Directory authorities now include a digest of each relay's
146 identity key as a part of its microdescriptor.
148 This is a workaround for bug 11743 (reported by "cypherpunks"),
149 where Tor clients do not support receiving multiple
150 microdescriptors with the same SHA256 digest in the same
151 consensus. When clients receive a consensus like this, they only
152 use one of the relays. Without this fix, a hostile relay could
153 selectively disable some client use of target relays by
154 constructing a router descriptor with a different identity and the
155 same microdescriptor parameters and getting the authorities to
156 list it in a microdescriptor consensus. This fix prevents an
157 attacker from causing a microdescriptor collision, because the
158 router's identity is not forgeable.
160 o Major bugfixes (relay):
161 - Use a direct dirport connection when uploading non-anonymous
162 descriptors to the directory authorities. Previously, relays would
163 incorrectly use tunnel connections under a fairly wide variety of
164 circumstances. Fixes bug 11469; bugfix on 0.2.4.3-alpha.
165 - When a circuit accidentally has the same circuit ID for its
166 forward and reverse direction, correctly detect the direction of
167 cells using that circuit. Previously, this bug made roughly one
168 circuit in a million non-functional. Fixes bug 12195; this is a
169 bugfix on every version of Tor.
171 o Major bugfixes (client, pluggable transports):
172 - When managing pluggable transports, use OS notification facilities
173 to learn if they have crashed, and don't attempt to kill any
174 process that has already exited. Fixes bug 8746; bugfix
178 - Instead of writing destroy cells directly to outgoing connection
179 buffers, queue them and intersperse them with other outgoing cells.
180 This can prevent a set of resource starvation conditions where too
181 many pending destroy cells prevent data cells from actually getting
182 delivered. Reported by "oftc_must_be_destroyed". Fixes bug 7912;
183 bugfix on 0.2.0.1-alpha.
191 o Minor features (bridge):
192 - Add an ExtORPortCookieAuthFileGroupReadable option to make the
193 cookie file for the ExtORPort g+r by default.
195 o Minor features (geoip):
196 - Update geoip and geoip6 to the August 7 2014 Maxmind GeoLite2
200 - Authorities now assign the Guard flag to the fastest 25% of the
201 network (it used to be the fastest 50%). Also raise the consensus
202 weight that guarantees the Guard flag from 250 to 2000. For the
203 current network, this results in about 1100 guards, down from 2500.
204 This step paves the way for moving the number of entry guards
205 down to 1 (proposal 236) while still providing reasonable expected
206 performance for most users. Implements ticket 12690.
208 o Minor features (diagnostic):
209 - When logging a warning because of bug 7164, additionally check the
210 hash table for consistency (as proposed on ticket 11737). This may
211 help diagnose bug 7164.
212 - When we log a heartbeat, log how many one-hop circuits we have
213 that are at least 30 minutes old, and log status information about
214 a few of them. This is an attempt to track down bug 8387.
215 - When encountering an unexpected CR while writing text to a file on
216 Windows, log the name of the file. Should help diagnosing
218 - Give more specific warnings when a client notices that an onion
219 handshake has failed. Fixes ticket 9635.
220 - Add significant new logging code to attempt to diagnose bug 12184,
221 where relays seem to run out of available circuit IDs.
222 - Improve the diagnostic log message for bug 8387 even further to
223 try to improve our odds of figuring out why one-hop directory
224 circuits sometimes do not get closed.
226 o Minor features (security, memory management):
227 - Memory allocation tricks (mempools and buffer freelists) are now
228 disabled by default. You can turn them back on with
229 --enable-mempools and --enable-buf-freelists respectively. We're
230 disabling these features because malloc performance is good enough
231 on most platforms, and a similar feature in OpenSSL exacerbated
232 exploitation of the Heartbleed attack. Resolves ticket 11476.
234 o Minor features (build):
235 - The configure script has a --disable-seccomp option to turn off
236 support for libseccomp on systems that have it, in case it (or
237 Tor's use of it) is broken. Resolves ticket 11628.
239 o Minor features (transparent proxy, *BSD):
240 - Support FreeBSD's ipfw firewall interface for TransPort ports on
241 FreeBSD. To enable it, set "TransProxyType ipfw". Resolves ticket
242 10267; patch from "yurivict".
243 - Support OpenBSD's divert-to rules with the pf firewall for
244 transparent proxy ports. To enable it, set "TransProxyType
245 pf-divert". This allows Tor to run a TransPort transparent proxy
246 port on OpenBSD 4.4 or later without root privileges. See the
247 pf.conf(5) manual page for information on configuring pf to use
248 divert-to rules. Closes ticket 10896; patch from Dana Koch.
250 o Minor features (security):
251 - New --enable-expensive-hardening option to enable security
252 hardening options that consume nontrivial amounts of CPU and
253 memory. Right now, this includes AddressSanitizer and UbSan, which
254 are supported in newer versions of GCC and Clang. Closes ticket
257 o Minor features (log verbosity):
258 - Demote the message that we give when a flushing connection times
259 out for too long from NOTICE to INFO. It was usually meaningless.
260 Resolves ticket 5286.
261 - Don't log so many notice-level bootstrapping messages at startup
262 about downloading descriptors. Previously, we'd log a notice
263 whenever we learned about more routers. Now, we only log a notice
264 at every 5% of progress. Fixes bug 9963.
265 - Warn less verbosely when receiving a malformed
266 ESTABLISH_RENDEZVOUS cell. Fixes ticket 11279.
268 o Minor features (relay):
269 - If a circuit timed out for at least 3 minutes, check if we have a
270 new external IP address, and publish a new descriptor with the new
271 IP address if it changed. Resolves ticket 2454.
273 o Minor features (controller):
274 - Make the entire exit policy available from the control port via
275 GETINFO exit-policy/*. Implements enhancement 7952. Patch from
277 - Because of the fix for ticket 11396, the real limit for memory
278 usage may no longer match the configured MaxMemInQueues value. The
279 real limit is now exposed via GETINFO limits/max-mem-in-queues.
281 o Minor features (bridge client):
282 - Report a more useful failure message when we can't connect to a
283 bridge because we don't have the right pluggable transport
284 configured. Resolves ticket 9665. Patch from Fábio J. Bertinatto.
286 o Minor features (diagnostic):
287 - Add more log messages to diagnose bug 7164, which causes
288 intermittent "microdesc_free() called but md was still referenced"
289 warnings. We now include more information, to figure out why we
290 might be cleaning a microdescriptor for being too old if it's
291 still referenced by a live node_t object.
293 o Minor features (bridges, pluggable transports):
294 - Bridges now write the SHA1 digest of their identity key
295 fingerprint (that is, a hash of a hash of their public key) to
296 notice-level logs, and to a new hashed-fingerprint file. This
297 information will help bridge operators look up their bridge in
298 Globe and similar tools. Resolves ticket 10884.
299 - Improve the message that Tor displays when running as a bridge
300 using pluggable transports without an Extended ORPort listener.
301 Also, log the message in the log file too. Resolves ticket 11043.
303 o Minor features (other):
304 - Add a new option, PredictedPortsRelevanceTime, to control how long
305 after having received a request to connect to a given port Tor
306 will try to keep circuits ready in anticipation of future requests
307 for that port. Patch from "unixninja92"; implements ticket 9176.
308 - Generate a warning if any ports are listed in the SocksPolicy,
309 DirPolicy, AuthDirReject, AuthDirInvalid, AuthDirBadDir, or
310 AuthDirBadExit options. (These options only support address
311 ranges.) Fixes part of ticket 11108.
313 o Minor features (bridges, pluggable transports):
314 - Add threshold cutoffs to the networkstatus document created by
315 the Bridge Authority. Fixes bug 1117.
316 - On Windows, spawn background processes using the CREATE_NO_WINDOW
317 flag. Now Tor Browser Bundle 3.5 with pluggable transports enabled
318 doesn't pop up a blank console window. (In Tor Browser Bundle 2.x,
319 Vidalia set this option for us.) Implements ticket 10297.
321 o Minor features (config options and command line):
322 - Add an --allow-missing-torrc commandline option that tells Tor to
323 run even if the configuration file specified by -f is not available.
324 Implements ticket 10060.
325 - Add support for the TPROXY transparent proxying facility on Linux.
326 See documentation for the new TransProxyType option for more
327 details. Implementation by "thomo". Closes ticket 10582.
329 o Minor features (controller):
330 - Add a new "HS_DESC" controller event that reports activities
331 related to hidden service descriptors. Resolves ticket 8510.
332 - New "DROPGUARDS" controller command to forget all current entry
333 guards. Not recommended for ordinary use, since replacing guards
334 too frequently makes several attacks easier. Resolves ticket 9934;
337 o Minor features (build):
338 - Assume that a user using ./configure --host wants to cross-compile,
339 and give an error if we cannot find a properly named
340 tool-chain. Add a --disable-tool-name-check option to proceed
341 nevertheless. Addresses ticket 9869. Patch by Benedikt Gollatz.
342 - If we run ./configure and the compiler recognizes -fstack-protector
343 but the linker rejects it, warn the user about a potentially missing
344 libssp package. Addresses ticket 9948. Patch from Benedikt Gollatz.
346 o Minor features (testing):
347 - If Python is installed, "make check" now runs extra tests beyond
348 the unit test scripts.
349 - When bootstrapping a test network, sometimes very few relays get
350 the Guard flag. Now a new option "TestingDirAuthVoteGuard" can
351 specify a set of relays which should be voted Guard regardless of
352 their uptime or bandwidth. Addresses ticket 9206.
354 o Minor features (log messages):
355 - When ServerTransportPlugin is set on a bridge, Tor can write more
356 useful statistics about bridge use in its extrainfo descriptors,
357 but only if the Extended ORPort ("ExtORPort") is set too. Add a
358 log message to inform the user in this case. Resolves ticket 9651.
359 - When receiving a new controller connection, log the origin address.
360 Resolves ticket 9698; patch from "sigpipe".
361 - When logging OpenSSL engine status at startup, log the status of
362 more engines. Fixes ticket 10043; patch from Joshua Datko.
364 o Minor features (config options):
365 - Config (torrc) lines now handle fingerprints which are missing
366 their initial '$'. Resolves ticket 4341; improvement over 0.0.9pre5.
367 - Support a --dump-config option to print some or all of the
368 configured options. Mainly useful for debugging the command-line
369 option parsing code. Helps resolve ticket 4647.
370 - Raise awareness of safer logging: notify user of potentially
371 unsafe config options, like logging more verbosely than severity
372 "notice" or setting SafeLogging to 0. Resolves ticket 5584.
373 - Add a new configuration option TestingV3AuthVotingStartOffset
374 that bootstraps a network faster by changing the timing for
375 consensus votes. Addresses ticket 8532.
376 - Add a new torrc option "ServerTransportOptions" that allows
377 bridge operators to pass configuration parameters to their
378 pluggable transports. Resolves ticket 8929.
379 - The config (torrc) file now accepts bandwidth and space limits in
380 bits as well as bytes. (Anywhere that you can say "2 Kilobytes",
381 you can now say "16 kilobits", and so on.) Resolves ticket 9214.
384 o Minor features (build):
385 - Add support for `--library-versions` flag. Implements ticket 6384.
386 - Return the "unexpected sendme" warnings to a warn severity, but make
387 them rate limited, to help diagnose ticket 8093.
388 - Detect a missing asciidoc, and warn the user about it, during
389 configure rather than at build time. Fixes issue 6506. Patch from
392 o Minor features (other):
393 - Use the SOCK_NONBLOCK socket type, if supported, to open nonblocking
394 sockets in a single system call. Implements ticket 5129.
395 - Log current accounting state (bytes sent and received + remaining
396 time for the current accounting period) in the relay's heartbeat
397 message. Implements ticket 5526; patch from Peter Retzlaff.
398 - Implement the TRANSPORT_LAUNCHED control port event that
399 notifies controllers about new launched pluggable
400 transports. Resolves ticket 5609.
401 - If we're using the pure-C 32-bit curve25519_donna implementation
402 of curve25519, build it with the -fomit-frame-pointer option to
403 make it go faster on register-starved hosts. This improves our
404 handshake performance by about 6% on i386 hosts without nacl.
415 o Minor bugfixes (logging):
416 - Downgrade "Unexpected onionskin length after decryption" warning
417 to a protocol-warn, since there's nothing relay operators can do
418 about a client that sends them a malformed create cell. Resolves
419 bug 12996; bugfix on 0.0.6rc1.
420 - Log more specific warnings when we get an ESTABLISH_RENDEZVOUS
421 cell on a cannibalized or non-OR circuit. Resolves ticket 12997.
422 - When logging information about an EXTEND2 or EXTENDED2 cell, log
423 their names correctly. Fixes part of bug 12700; bugfix
425 - When logging information about a relay cell whose command we don't
426 recognize, log its command as an integer. Fixes part of bug 12700;
427 bugfix on 0.2.1.10-alpha.
428 - Escape all strings from the directory connection before logging
429 them. Fixes bug 13071; bugfix on 0.1.1.15. Patch from "teor".
431 o Minor bugfixes (compilation):
432 - In routerlist_assert_ok(), don't take the address of a
433 routerinfo's cache_info member unless that routerinfo is non-NULL.
434 Fixes bug 13096; bugfix on 0.1.1.9-alpha. Patch by "teor".
435 - Fix a large number of false positive warnings from the clang
436 analyzer static analysis tool. This should make real warnings
437 easier for clang analyzer to find. Patch from "teor". Closes
441 - Compile correctly with builds and forks of OpenSSL (such as
442 LibreSSL) that disable compression. Fixes bug 12602; bugfix on
443 0.2.1.1-alpha. Patch from "dhill".
445 o Minor bugfixes (performance):
446 - Avoid a bug where every successful connection made us recompute
447 the flag telling us whether we have sufficient information to
448 build circuits. Previously, we would forget our cached value
449 whenever we successfully opened a channel (or marked a router as
450 running or not running for any other reason), regardless of
451 whether we had previously believed the router to be running. This
452 forced us to run an expensive update operation far too often.
453 Fixes bug 12170; bugfix on 0.1.2.1-alpha.
454 - Avoid using tor_memeq() for checking relay cell integrity. This
455 removes a possible performance bottleneck. Fixes part of bug
456 12169; bugfix on 0.2.1.31.
458 o Minor bugfixes (compilation):
459 - Resolve GCC complaints on OpenBSD about discarding constness in
460 TO_{ORIGIN,OR}_CIRCUIT functions. Fixes part of bug 11633; bugfix
461 on 0.1.1.23. Patch from Dana Koch.
462 - Resolve clang complaints on OpenBSD with -Wshorten-64-to-32 due to
463 treatment of long and time_t as comparable types. Fixes part of
464 bug 11633. Patch from Dana Koch.
465 - When deciding whether to build the 64-bit curve25519
466 implementation, detect platforms where we can compile 128-bit
467 arithmetic but cannot link it. Fixes bug 11729; bugfix on
468 0.2.4.8-alpha. Patch from "conradev".
469 - Fix compilation when DNS_CACHE_DEBUG is enabled. Fixes bug 11761;
470 bugfix on 0.2.3.13-alpha. Found by "cypherpunks".
471 - Fix compilation with dmalloc. Fixes bug 11605; bugfix
474 o Minor bugfixes (Directory server):
475 - When sending a compressed set of descriptors or microdescriptors,
476 make sure to finalize the zlib stream. Previously, we would write
477 all the compressed data, but if the last descriptor we wanted to
478 send was missing or too old, we would not mark the stream as
479 finished. This caused problems for decompression tools. Fixes bug
480 11648; bugfix on 0.1.1.23.
482 o Minor bugfixes (pluggable transports):
483 - Avoid another 60-second delay when starting Tor in a pluggable-
484 transport-using configuration when we already have cached
485 descriptors for our bridges. Fixes bug 11965; bugfix
488 o Minor bugfixes (client):
489 - Avoid "Tried to open a socket with DisableNetwork set" warnings
490 when starting a client with bridges configured and DisableNetwork
491 set. (Tor launcher starts Tor with DisableNetwork set the first
492 time it runs.) Fixes bug 10405; bugfix on 0.2.3.9-alpha.
494 o Minor bugfixes (testing):
495 - Fix all valgrind warnings produced by the unit tests. There were
496 over a thousand memory leak warnings previously, mostly produced
497 by forgetting to free things in the unit test code. Fixes bug
498 11618, bugfixes on many versions of Tor.
500 o Minor bugfixes (tor-fw-helper):
501 - Give a correct log message when tor-fw-helper fails to launch.
502 (Previously, we would say something like "tor-fw-helper sent us a
503 string we could not parse".) Fixes bug 9781; bugfix
506 o Minor bugfixes (relay, threading):
507 - Check return code on spawn_func() in cpuworker code, so that we
508 don't think we've spawned a nonworking cpuworker and write junk to
509 it forever. Fix related to bug 4345; bugfix on all released Tor
510 versions. Found by "skruffy".
511 - Use a pthread_attr to make sure that spawn_func() cannot return an
512 error while at the same time launching a thread. Fix related to
513 bug 4345; bugfix on all released Tor versions. Reported
516 o Minor bugfixes (relay, other):
517 - We now drop CREATE cells for already-existent circuit IDs and for
518 zero-valued circuit IDs, regardless of other factors that might
519 otherwise have called for DESTROY cells. Fixes bug 12191; bugfix
521 - When rejecting DATA cells for stream_id zero, still count them
522 against the circuit's deliver window so that we don't fail to send
523 a SENDME. Fixes bug 11246; bugfix on 0.2.4.10-alpha.
525 o Minor bugfixes (logging):
526 - Squelch a spurious LD_BUG message "No origin circuit for
527 successful SOCKS stream" in certain hidden service failure cases;
530 o Minor bugfixes (client, DNSPort):
531 - When using DNSPort, try to respond to AAAA requests with AAAA
532 answers. Previously, we hadn't looked at the request type when
533 deciding which answer type to prefer. Fixes bug 10468; bugfix on
535 - When receiving a DNS query for an unsupported record type, reply
536 with no answer rather than with a NOTIMPL error. This behavior
537 isn't correct either, but it will break fewer client programs, we
538 hope. Fixes bug 10268; bugfix on 0.2.0.1-alpha. Original patch
541 o Minor bugfixes (bridge client):
542 - Stop accepting bridge lines containing hostnames. Doing so would
543 cause clients to perform DNS requests on the hostnames, which was
544 not sensible behavior. Fixes bug 10801; bugfix on 0.2.0.1-alpha.
546 o Minor bugfixes (client, logging during bootstrap):
547 - Only report the first fatal bootstrap error on a given OR
548 connection. This stops us from telling the controller bogus error
549 messages like "DONE". Fixes bug 10431; bugfix on 0.2.1.1-alpha.
550 - Avoid generating spurious warnings when starting with
551 DisableNetwork enabled. Fixes bug 11200 and bug 10405; bugfix on
554 o Minor bugfixes (closing OR connections):
555 - If write_to_buf() in connection_write_to_buf_impl_() ever fails,
556 check if it's an or_connection_t and correctly call
557 connection_or_close_for_error() rather than
558 connection_mark_for_close() directly. Fixes bug 11304; bugfix on
560 - When closing all connections on setting DisableNetwork to 1, use
561 connection_or_close_normally() rather than closing OR connections
562 out from under the channel layer. Fixes bug 11306; bugfix on
565 o Minor bugfixes (bridges):
566 - Avoid potential crashes or bad behavior when launching a
567 server-side managed proxy with ORPort or ExtORPort temporarily
568 disabled. Fixes bug 9650; bugfix on 0.2.3.16-alpha.
570 o Minor bugfixes (platform-specific):
571 - When dumping a malformed directory object to disk, save it in
572 binary mode on Windows, not text mode. Fixes bug 11342; bugfix on
574 - Don't report failures from make_socket_reuseable() on incoming
575 sockets on OSX: this can happen when incoming connections close
576 early. Fixes bug 10081.
578 o Minor bugfixes (trivial memory leaks):
579 - Fix a small memory leak when signing a directory object. Fixes bug
580 11275; bugfix on 0.2.4.13-alpha.
581 - Resolve some memory leaks found by coverity in the unit tests, on
582 exit in tor-gencert, and on a failure to compute digests for our
583 own keys when generating a v3 networkstatus vote. These leaks
584 should never have affected anyone in practice.
586 o Minor bugfixes (hidden service):
587 - Only retry attempts to connect to a chosen rendezvous point 8
588 times, not 30. Fixes bug 4241; bugfix on 0.1.0.1-rc.
590 o Minor bugfixes (misc code correctness):
591 - Fix various instances of undefined behavior in channeltls.c,
592 tor_memmem(), and eventdns.c that would cause us to construct
593 pointers to memory outside an allocated object. (These invalid
594 pointers were not accessed, but C does not even allow them to
595 exist.) Fixes bug 10363; bugfixes on 0.1.1.1-alpha, 0.1.2.1-alpha,
596 0.2.0.10-alpha, and 0.2.3.6-alpha. Reported by "bobnomnom".
597 - Use the AddressSanitizer and Ubsan sanitizers (in clang-3.4) to
598 fix some miscellaneous errors in our tests and codebase. Fixes bug
599 11232. Bugfixes on versions back as far as 0.2.1.11-alpha.
600 - Always check return values for unlink, munmap, UnmapViewOfFile;
601 check strftime return values more often. In some cases all we can
602 do is report a warning, but this may help prevent deeper bugs from
603 going unnoticed. Closes ticket 8787; bugfixes on many, many tor
605 - Fix numerous warnings from the clang "scan-build" static analyzer.
606 Some of these are programming style issues; some of them are false
607 positives that indicated awkward code; some are undefined behavior
608 cases related to constructing (but not using) invalid pointers;
609 some are assumptions about API behavior; some are (harmlessly)
610 logging sizeof(ptr) bytes from a token when sizeof(*ptr) would be
611 correct; and one or two are genuine bugs that weren't reachable
612 from the rest of the program. Fixes bug 8793; bugfixes on many,
615 o Minor bugfixes (client):
616 - Improve the log message when we can't connect to a hidden service
617 because all of the hidden service directory nodes hosting its
618 descriptor are excluded. Improves on our fix for bug 10722, which
619 was a bugfix on 0.2.0.10-alpha.
620 - Raise a control port warning when we fail to connect to all of
621 our bridges. Previously, we didn't inform the controller, and
622 the bootstrap process would stall. Fixes bug 11069; bugfix on
624 - Exit immediately when a process-owning controller exits.
625 Previously, tor relays would wait for a little while after their
626 controller exited, as if they had gotten an INT signal -- but this
627 was problematic, since there was no feedback for the user. To do a
628 clean shutdown, controllers should send an INT signal and give Tor
629 a chance to clean up. Fixes bug 10449; bugfix on 0.2.2.28-beta.
630 - Stop attempting to connect to bridges before our pluggable
631 transports are configured (harmless but resulted in some erroneous
632 log messages). Fixes bug 11156; bugfix on 0.2.3.2-alpha.
633 - Fix connections to IPv6 addresses over SOCKS5. Previously, we were
634 generating incorrect SOCKS5 responses, and confusing client
635 applications. Fixes bug 10987; bugfix on 0.2.4.7-alpha.
637 o Minor bugfixes (relays and bridges):
638 - Avoid crashing on a malformed resolv.conf file when running a
639 relay using Libevent 1. Fixes bug 8788; bugfix on 0.1.1.23.
640 - Non-exit relays no longer launch mock DNS requests to check for
641 DNS hijacking. This has been unnecessary since 0.2.1.7-alpha, when
642 non-exit relays stopped servicing DNS requests. Fixes bug 965;
643 bugfix on 0.2.1.7-alpha. Patch from Matt Pagan.
644 - Bridges now report complete directory request statistics. Related
645 to bug 5824; bugfix on 0.2.2.1-alpha.
646 - Bridges now never collect statistics that were designed for
647 relays. Fixes bug 5824; bugfix on 0.2.3.8-alpha.
649 o Minor bugfixes (bridges):
650 - Fix a bug where the first connection works to a bridge that uses a
651 pluggable transport with client-side parameters, but we don't send
652 the client-side parameters on subsequent connections. (We don't
653 use any pluggable transports with client-side parameters yet,
654 but ScrambleSuit will soon become the first one.) Fixes bug 9162;
655 bugfix on 0.2.0.3-alpha. Based on a patch from "rl1987".
657 o Minor bugfixes (node selection):
658 - If ExcludeNodes is set, consider non-excluded hidden service
659 directory servers before excluded ones. Do not consider excluded
660 hidden service directory servers at all if StrictNodes is
661 set. (Previously, we would sometimes decide to connect to those
662 servers, and then realize before we initiated a connection that
663 we had excluded them.) Fixes bug 10722; bugfix on 0.2.0.10-alpha.
665 - If we set the ExitNodes option but it doesn't include any nodes
666 that have the Exit flag, we would choose not to bootstrap. Now we
667 bootstrap so long as ExitNodes includes nodes which can exit to
668 some port. Fixes bug 10543; bugfix on 0.2.4.10-alpha.
670 o Minor bugfixes (controller and command-line):
671 - If changing a config option via "setconf" fails in a recoverable
672 way, we used to nonetheless write our new control ports to the
673 file described by the "ControlPortWriteToFile" option. Now we only
674 write out that file if we successfully switch to the new config
675 option. Fixes bug 5605; bugfix on 0.2.2.26-beta. Patch from "Ryman".
677 o Minor bugfixes (code correctness):
678 - Previously we used two temporary files when writing descriptors to
679 disk; now we only use one. Fixes bug 1376.
680 - Remove an erroneous (but impossible and thus harmless) pointer
681 comparison that would have allowed compilers to skip a bounds
682 check in channeltls.c. Fixes bugs 10313 and 9980; bugfix on
683 0.2.0.10-alpha. Noticed by Jared L Wong and David Fifield.
684 - Fix an always-true assertion in pluggable transports code so it
685 actually checks what it was trying to check. Fixes bug 10046;
686 bugfix on 0.2.3.9-alpha. Found by "dcb".
688 o Minor bugfixes (protocol correctness):
689 - When receiving a VERSIONS cell with an odd number of bytes, close
690 the connection immediately since the cell is malformed. Fixes bug
691 10365; bugfix on 0.2.0.10-alpha. Spotted by "bobnomnom"; fix by
694 o Minor bugfixes (build):
695 - Restore the ability to compile Tor with V2_HANDSHAKE_SERVER
696 turned off (that is, without support for v2 link handshakes). Fixes
697 bug 4677; bugfix on 0.2.3.2-alpha. Patch from "piet".
699 o Minor bugfixes (log messages):
700 - Fix a bug where clients using bridges would report themselves
701 as 50% bootstrapped even without a live consensus document.
702 Fixes bug 9922; bugfix on 0.2.1.1-alpha.
703 - Suppress a warning where, if there's only one directory authority
704 in the network, we would complain that votes and signatures cannot
705 be uploaded to other directory authorities. Fixes bug 10842;
706 bugfix on 0.2.2.26-beta.
707 - Report bootstrapping progress correctly when we're downloading
708 microdescriptors. We had updated our "do we have enough microdescs
709 to begin building circuits?" logic most recently in 0.2.4.10-alpha
710 (see bug 5956), but we left the bootstrap status event logic at
711 "how far through getting 1/4 of them are we?" Fixes bug 9958;
712 bugfix on 0.2.2.36, which is where they diverged (see bug 5343).
715 - No longer accept malformed http headers when parsing urls from
716 headers. Now we reply with Bad Request ("400"). Fixes bug 2767;
718 - In munge_extrainfo_into_routerinfo(), check the return value of
719 memchr(). This would have been a serious issue if we ever passed
720 it a non-extrainfo. Fixes bug 8791; bugfix on 0.2.0.6-alpha. Patch
722 - On the chance that somebody manages to build Tor on a
723 platform where time_t is unsigned, correct the way that
724 microdesc_add_to_cache() handles negative time arguments.
725 Fixes bug 8042; bugfix on 0.2.3.1-alpha.
726 - Reject relative control socket paths and emit a warning. Previously,
727 single-component control socket paths would be rejected, but Tor
728 would not log why it could not validate the config. Fixes bug 9258;
729 bugfix on 0.2.3.16-alpha.
731 o Minor bugfixes (command line):
732 - Use a single command-line parser for parsing torrc options on the
733 command line and for finding special command-line options to avoid
734 inconsistent behavior for torrc option arguments that have the same
735 names as command-line options. Fixes bugs 4647 and 9578; bugfix on
737 - No longer allow 'tor --hash-password' with no arguments. Fixes bug
738 9573; bugfix on 0.0.9pre5.
740 o Minor fixes (build, auxiliary programs):
741 - Stop preprocessing the "torify" script with autoconf, since
742 it no longer refers to LOCALSTATEDIR. Fixes bug 5505; patch
744 - The tor-fw-helper program now follows the standard convention and
745 exits with status code "0" on success. Fixes bug 9030; bugfix on
746 0.2.3.1-alpha. Patch by Arlo Breault.
747 - Corrected ./configure advice for what openssl dev package you should
748 install on Debian. Fixes bug 9207; bugfix on 0.2.0.1-alpha.
756 - Adjust the URLs in the README to refer to the new locations of
757 several documents on the website. Fixes bug 12830. Patch from
759 - Document 'reject6' and 'accept6' ExitPolicy entries. Resolves
763 - Clean up several option names in the manpage to match their real
764 names, add the missing documentation for a couple of testing and
765 directory authority options, remove the documentation for a
766 V2-directory fetching option that no longer exists. Resolves
768 - Correct the documenation so that it lists the correct directory
769 for the stats files. (They are in a subdirectory called "stats",
771 - In the manpage, move more authority-only options into the
772 directory authority section so that operators of regular directory
773 caches don't get confused.
776 - Fix the layout of the SOCKSPort flags in the manpage. Fixes bug
777 11061; bugfix on 0.2.4.7-alpha.
778 - Resolve warnings from Doxygen.
781 - Document in the manpage that "KBytes" may also be written as
782 "kilobytes" or "KB", that "Kbits" may also be written as
783 "kilobits", and so forth. Closes ticket 9222.
784 - Document that the ClientOnly config option overrides ORPort.
785 Our old explanation made ClientOnly sound as though it did
786 nothing at all. Resolves bug 9059.
787 - Explain that SocksPolicy, DirPolicy, and similar options don't
788 take port arguments. Fixes the other part of ticket 11108.
789 - Fix a comment about the rend_server_descriptor_t.protocols field
790 to more accurately describe its range. Also, make that field
791 unsigned, to more accurately reflect its usage. Fixes bug 9099;
792 bugfix on 0.2.1.5-alpha.
793 - Fix the manpage's description of HiddenServiceAuthorizeClient:
794 the maximum client name length is 16, not 19. Fixes bug 11118;
795 bugfix on 0.2.1.6-alpha.
797 o Documentation (man page) fixes:
798 - Update manpage to describe some of the files you can expect to
799 find in Tor's DataDirectory. Addresses ticket 9839.
810 o Code simplifications and refactoring:
811 - Remove constants and tests for PKCS1 padding; it's insecure and
812 shouldn't be used for anything new. Fixes bug 8792; patch
814 - Remove instances of strcpy() from the unit tests. They weren't
815 hurting anything, since they were only in the unit tests, but it's
816 embarassing to have strcpy() in the code at all, and some analysis
817 tools don't like it. Fixes bug 8790; bugfix on 0.2.3.6-alpha and
818 0.2.3.8-alpha. Patch from Arlo Breault.
820 o Code simplifications and refactoring:
821 - Remove is_internal_IP() function. Resolves ticket 4645.
822 - Remove unused function circuit_dump_by_chan from circuitlist.c.
823 Closes issue 9107; patch from "marek".
824 - Change our use of the ENUM_BF macro to avoid declarations that
827 o Code simplifications and refactoring:
828 - Get rid of router->address, since in all cases it was just the
829 string representation of router->addr. Resolves ticket 5528.
831 o Code simplification and refactoring:
832 - Remove some old fallback code designed to keep Tor clients working
833 in a network with only two working relays. Elsewhere in the code we
834 have long since stopped supporting such networks, so there wasn't
835 much point in keeping it around. Addresses ticket 9926.
836 - Reject 0-length EXTEND2 cells more explicitly. Fixes bug 10536;
837 bugfix on 0.2.4.8-alpha. Reported by "cypherpunks".
839 o Code simplification and refactoring:
840 - Extract the common duplicated code for creating a subdirectory
841 of the data directory and writing to a file in it. Fixes ticket
842 4282; patch from Peter Retzlaff.
843 - Since OpenSSL 0.9.7, the i2d_*() functions support allocating output
844 buffer. Avoid calling twice: i2d_RSAPublicKey(), i2d_DHparams(),
845 i2d_X509(), and i2d_PublicKey(). Resolves ticket 5170.
846 - Add a set of accessor functions for the circuit timeout data
847 structure. Fixes ticket 6153; patch from "piet".
848 - Clean up exit paths from connection_listener_new(). Closes ticket
849 8789. Patch from Arlo Breault.
850 - Since we rely on OpenSSL 0.9.8 now, we can use EVP_PKEY_cmp()
851 and drop our own custom pkey_eq() implementation. Fixes bug 9043.
852 - Use a doubly-linked list to implement the global circuit list.
853 Resolves ticket 9108. Patch from Marek Majkowski.
854 - Remove contrib/id_to_fp.c since it wasn't used anywhere.
860 o Distribution (systemd):
861 - Verify configuration file via ExecStartPre in the systemd unit
862 file. Patch from intrigeri; resolves ticket 12730.
863 - Explicitly disable RunAsDaemon in the systemd unit file. Our
864 current systemd unit uses "Type = simple", so systemd does not
865 expect tor to fork. If the user has "RunAsDaemon 1" in their
866 torrc, then things won't work as expected. This is e.g. the case
867 on Debian (and derivatives), since there we pass "--defaults-torrc
868 /usr/share/tor/tor-service-defaults-torrc" (that contains
869 "RunAsDaemon 1") by default. Patch by intrigeri; resolves
873 - Include a tor.service file in contrib/dist for use with systemd.
874 Some distributions will be able to use this file unmodified;
875 others will need to tweak it, or write their own. Patch from Jamie
876 Nguyen; resolves ticket 8368.
879 - The contrib directory has been sorted and tidied. Before, it was
880 an unsorted dumping ground for useful and not-so-useful things.
881 Now, it is divided based on functionality, and the items which
882 seemed to be nonfunctional or useless have been removed. Resolves
883 ticket 8966; based on patches from "rl1987".
892 - Remove /tor/dbg-stability.txt URL that was meant to help debug WFU
893 and MTBF calculations, but that nobody was using. Fixes bug 11742.
894 - The TunnelDirConns and PreferTunnelledDirConns options no longer
895 exist; tunneled directory connections have been available since
896 0.1.2.5-alpha, and turning them off is not a good idea. This is a
897 brute-force fix for 10849, where "TunnelDirConns 0" would break
900 - Remove all code for the long unused v1 directory protocol.
901 Resolves ticket 11070.
903 - Remove all remaining code related to version-0 hidden service
904 descriptors: they have not been in use since 0.2.2.1-alpha. Fixes
905 the rest of bug 10841.
906 o Removed code and features:
907 - Clients now reject any directory authority certificates lacking
908 a dir-key-crosscert element. These have been included since
909 0.2.1.9-alpha, so there's no real reason for them to be optional
910 any longer. Completes proposal 157. Resolves ticket 10162.
911 - Remove all code that existed to support the v2 directory system,
912 since there are no longer any v2 directory authorities. Resolves
914 - Remove the HSAuthoritativeDir and AlternateHSAuthority torrc
915 options, which were used for designating authorities as "Hidden
916 service authorities". There has been no use of hidden service
917 authorities since 0.2.2.1-alpha, when we stopped uploading or
918 downloading v0 hidden service descriptors. Fixes bug 10881; also
919 part of a fix for bug 10841.
921 - Remove migration code from when we renamed the "cached-routers"
922 file to "cached-descriptors" back in 0.2.0.8-alpha. This
923 incidentally resolves ticket 6502 by cleaning up the related code
924 a bit. Patch from Akshay Hebbar.
930 o Test infrastructure:
931 - Tor now builds each source file in two modes: a mode that avoids
932 exposing identifiers needlessly, and another mode that exposes
933 more identifiers for testing. This lets the compiler do better at
934 optimizing the production code, while enabling us to take more
935 radical measures to let the unit tests test things.
936 - The production builds no longer include functions used only in
937 the unit tests; all functions exposed from a module only for
938 unit-testing are now static in production builds.
939 - Add an --enable-coverage configuration option to make the unit
940 tests (and a new src/or/tor-cov target) to build with gcov test
942 - Update to the latest version of tinytest.
943 - Improve the tinytest implementation of string operation tests so
944 that comparisons with NULL strings no longer crash the tests; they
945 now just fail, normally. Fixes bug 9004; bugfix on 0.2.2.4-alpha.
948 - New macros in test.h to simplify writing mock-functions for unit
949 tests. Part of ticket 11507. Patch from Dana Koch.
950 - Complete tests for the status.c module. Resolves ticket 11507.
951 Patch from Dana Koch.
952 - We now have rudimentary function mocking support that our unit
953 tests can use to test functions in isolation. Function mocking
954 lets the tests temporarily replace a function's dependencies with
955 stub functions, so that the tests can check the function without
956 invoking the other functions it calls.
957 - Add more unit tests for the <circid,channel>->circuit map, and
958 the destroy-cell-tracking code to fix bug 7912.
959 - Unit tests for failing cases of the TAP onion handshake.
960 - More unit tests for address-manipulation functions.
969 This release marks end-of-life for Tor 0.2.2.x; those Tor versions
970 have accumulated many known flaws; everyone should upgrade.
972 o Deprecated versions:
973 - Tor 0.2.2.x has reached end-of-life; it has received no patches or
974 attention for some while. Directory authorities no longer accept
975 descriptors from relays running any version of Tor prior to Tor
976 0.2.3.16-alpha. Resolves ticket 11149.
979 - Make the "tor-gencert" tool used by directory authority operators
980 create 2048-bit signing keys by default (rather than 1024-bit, since
981 1024-bit is uncomfortably small these days). Addresses ticket 10324.
984 Changes in version 0.2.4.24 - 2014-09-22
985 Tor 0.2.4.24 fixes a bug that affects consistency and speed when
986 connecting to hidden services, and it updates the location of one of
987 the directory authorities.
990 - Clients now send the correct address for their chosen rendezvous
991 point when trying to access a hidden service. They used to send
992 the wrong address, which would still work some of the time because
993 they also sent the identity digest of the rendezvous point, and if
994 the hidden service happened to try connecting to the rendezvous
995 point from a relay that already had a connection open to it,
996 the relay would reuse that connection. Now connections to hidden
997 services should be more robust and faster. Also, this bug meant
998 that clients were leaking to the hidden service whether they were
999 on a little-endian (common) or big-endian (rare) system, which for
1000 some users might have reduced their anonymity. Fixes bug 13151;
1001 bugfix on 0.2.1.5-alpha.
1003 o Directory authority changes:
1004 - Change IP address for gabelmoo (v3 directory authority).
1006 o Minor features (geoip):
1007 - Update geoip and geoip6 to the August 7 2014 Maxmind GeoLite2
1011 Changes in version 0.2.4.23 - 2014-07-28
1012 Tor 0.2.4.23 brings us a big step closer to slowing down the risk from
1013 guard rotation, and also backports several important fixes from the
1014 Tor 0.2.5 alpha release series.
1017 - Clients now look at the "usecreatefast" consensus parameter to
1018 decide whether to use CREATE_FAST or CREATE cells for the first hop
1019 of their circuit. This approach can improve security on connections
1020 where Tor's circuit handshake is stronger than the available TLS
1021 connection security levels, but the tradeoff is more computational
1022 load on guard relays. Implements proposal 221. Resolves ticket 9386.
1023 - Make the number of entry guards configurable via a new
1024 NumEntryGuards consensus parameter, and the number of directory
1025 guards configurable via a new NumDirectoryGuards consensus
1026 parameter. Implements ticket 12688.
1029 - Fix a bug in the bounds-checking in the 32-bit curve25519-donna
1030 implementation that caused incorrect results on 32-bit
1031 implementations when certain malformed inputs were used along with
1032 a small class of private ntor keys. This bug does not currently
1033 appear to allow an attacker to learn private keys or impersonate a
1034 Tor server, but it could provide a means to distinguish 32-bit Tor
1035 implementations from 64-bit Tor implementations. Fixes bug 12694;
1036 bugfix on 0.2.4.8-alpha. Bug found by Robert Ransom; fix from
1040 - Warn and drop the circuit if we receive an inbound 'relay early'
1041 cell. Those used to be normal to receive on hidden service circuits
1042 due to bug 1038, but the buggy Tor versions are long gone from
1043 the network so we can afford to resume watching for them. Resolves
1044 the rest of bug 1038; bugfix on 0.2.1.19.
1045 - Correct a confusing error message when trying to extend a circuit
1046 via the control protocol but we don't know a descriptor or
1047 microdescriptor for one of the specified relays. Fixes bug 12718;
1048 bugfix on 0.2.3.1-alpha.
1049 - Avoid an illegal read from stack when initializing the TLS
1050 module using a version of OpenSSL without all of the ciphers
1051 used by the v2 link handshake. Fixes bug 12227; bugfix on
1052 0.2.4.8-alpha. Found by "starlight".
1055 - Update geoip and geoip6 to the July 10 2014 Maxmind GeoLite2
1059 Changes in version 0.2.4.22 - 2014-05-16
1060 Tor 0.2.4.22 backports numerous high-priority fixes from the Tor 0.2.5
1061 alpha release series. These include blocking all authority signing
1062 keys that may have been affected by the OpenSSL "heartbleed" bug,
1063 choosing a far more secure set of TLS ciphersuites by default, closing
1064 a couple of memory leaks that could be used to run a target relay out
1065 of RAM, and several others.
1067 o Major features (security, backport from 0.2.5.4-alpha):
1068 - Block authority signing keys that were used on authorities
1069 vulnerable to the "heartbleed" bug in OpenSSL (CVE-2014-0160). (We
1070 don't have any evidence that these keys _were_ compromised; we're
1071 doing this to be prudent.) Resolves ticket 11464.
1073 o Major bugfixes (security, OOM):
1074 - Fix a memory leak that could occur if a microdescriptor parse
1075 fails during the tokenizing step. This bug could enable a memory
1076 exhaustion attack by directory servers. Fixes bug 11649; bugfix
1079 o Major bugfixes (TLS cipher selection, backport from 0.2.5.4-alpha):
1080 - The relay ciphersuite list is now generated automatically based on
1081 uniform criteria, and includes all OpenSSL ciphersuites with
1082 acceptable strength and forward secrecy. Previously, we had left
1083 some perfectly fine ciphersuites unsupported due to omission or
1084 typo. Resolves bugs 11513, 11492, 11498, 11499. Bugs reported by
1085 'cypherpunks'. Bugfix on 0.2.4.8-alpha.
1086 - Relays now trust themselves to have a better view than clients of
1087 which TLS ciphersuites are better than others. (Thanks to bug
1088 11513, the relay list is now well-considered, whereas the client
1089 list has been chosen mainly for anti-fingerprinting purposes.)
1090 Relays prefer: AES over 3DES; then ECDHE over DHE; then GCM over
1091 CBC; then SHA384 over SHA256 over SHA1; and last, AES256 over
1092 AES128. Resolves ticket 11528.
1093 - Clients now try to advertise the same list of ciphersuites as
1094 Firefox 28. This change enables selection of (fast) GCM
1095 ciphersuites, disables some strange old ciphers, and stops
1096 advertising the ECDH (not to be confused with ECDHE) ciphersuites.
1097 Resolves ticket 11438.
1099 o Minor bugfixes (configuration, security):
1100 - When running a hidden service, do not allow TunneledDirConns 0:
1101 trying to set that option together with a hidden service would
1102 otherwise prevent the hidden service from running, and also make
1103 it publish its descriptors directly over HTTP. Fixes bug 10849;
1104 bugfix on 0.2.1.1-alpha.
1106 o Minor bugfixes (controller, backport from 0.2.5.4-alpha):
1107 - Avoid sending a garbage value to the controller when a circuit is
1108 cannibalized. Fixes bug 11519; bugfix on 0.2.3.11-alpha.
1110 o Minor bugfixes (exit relay, backport from 0.2.5.4-alpha):
1111 - Stop leaking memory when we successfully resolve a PTR record.
1112 Fixes bug 11437; bugfix on 0.2.4.7-alpha.
1114 o Minor bugfixes (bridge client, backport from 0.2.5.4-alpha):
1115 - Avoid 60-second delays in the bootstrapping process when Tor is
1116 launching for a second time while using bridges. Fixes bug 9229;
1117 bugfix on 0.2.0.3-alpha.
1119 o Minor bugfixes (relays and bridges, backport from 0.2.5.4-alpha):
1120 - Give the correct URL in the warning message when trying to run a
1121 relay on an ancient version of Windows. Fixes bug 9393.
1123 o Minor bugfixes (compilation):
1124 - Fix a compilation error when compiling with --disable-curve25519.
1125 Fixes bug 9700; bugfix on 0.2.4.17-rc.
1128 - Downgrade the warning severity for the the "md was still
1129 referenced 1 node(s)" warning. Tor 0.2.5.4-alpha has better code
1130 for trying to diagnose this bug, and the current warning in
1131 earlier versions of tor achieves nothing useful. Addresses warning
1134 o Minor features (log verbosity, backport from 0.2.5.4-alpha):
1135 - When we run out of usable circuit IDs on a channel, log only one
1136 warning for the whole channel, and describe how many circuits
1137 there were on the channel. Fixes part of ticket 11553.
1139 o Minor features (security, backport from 0.2.5.4-alpha):
1140 - Decrease the lower limit of MaxMemInCellQueues to 256 MBytes (but
1141 leave the default at 8GBytes), to better support Raspberry Pi
1142 users. Fixes bug 9686; bugfix on 0.2.4.14-alpha.
1144 o Documentation (backport from 0.2.5.4-alpha):
1145 - Correctly document that we search for a system torrc file before
1146 looking in ~/.torrc. Fixes documentation side of 9213; bugfix on
1150 Changes in version 0.2.4.21 - 2014-02-28
1151 Tor 0.2.4.21 further improves security against potential adversaries who
1152 find breaking 1024-bit crypto doable, and backports several stability
1153 and robustness patches from the 0.2.5 branch.
1155 o Major features (client security):
1156 - When we choose a path for a 3-hop circuit, make sure it contains
1157 at least one relay that supports the NTor circuit extension
1158 handshake. Otherwise, there is a chance that we're building
1159 a circuit that's worth attacking by an adversary who finds
1160 breaking 1024-bit crypto doable, and that chance changes the game
1161 theory. Implements ticket 9777.
1164 - Do not treat streams that fail with reason
1165 END_STREAM_REASON_INTERNAL as indicating a definite circuit failure,
1166 since it could also indicate an ENETUNREACH connection error. Fixes
1167 part of bug 10777; bugfix on 0.2.4.8-alpha.
1169 o Code simplification and refactoring:
1170 - Remove data structures which were introduced to implement the
1171 CellStatistics option: they are now redundant with the new timestamp
1172 field in the regular packed_cell_t data structure, which we did
1173 in 0.2.4.18-rc in order to resolve bug 9093. Resolves ticket 10870.
1176 - Always clear OpenSSL bignums before freeing them -- even bignums
1177 that don't contain secrets. Resolves ticket 10793. Patch by
1179 - Build without warnings under clang 3.4. (We have some macros that
1180 define static functions only some of which will get used later in
1181 the module. Starting with clang 3.4, these give a warning unless the
1182 unused attribute is set on them.) Resolves ticket 10904.
1183 - Update geoip and geoip6 files to the February 7 2014 Maxmind
1184 GeoLite2 Country database.
1187 - Set the listen() backlog limit to the largest actually supported
1188 on the system, not to the value in a header file. Fixes bug 9716;
1189 bugfix on every released Tor.
1190 - Treat ENETUNREACH, EACCES, and EPERM connection failures at an
1191 exit node as a NOROUTE error, not an INTERNAL error, since they
1192 can apparently happen when trying to connect to the wrong sort
1193 of netblocks. Fixes part of bug 10777; bugfix on 0.1.0.1-rc.
1194 - Fix build warnings about missing "a2x" comment when building the
1195 manpages from scratch on OpenBSD; OpenBSD calls it "a2x.py".
1196 Fixes bug 10929; bugfix on 0.2.2.9-alpha. Patch from Dana Koch.
1197 - Avoid a segfault on SIGUSR1, where we had freed a connection but did
1198 not entirely remove it from the connection lists. Fixes bug 9602;
1199 bugfix on 0.2.4.4-alpha.
1200 - Fix a segmentation fault in our benchmark code when running with
1201 Fedora's OpenSSL package, or any other OpenSSL that provides
1202 ECDH but not P224. Fixes bug 10835; bugfix on 0.2.4.8-alpha.
1203 - Turn "circuit handshake stats since last time" log messages into a
1204 heartbeat message. Fixes bug 10485; bugfix on 0.2.4.17-rc.
1206 o Documentation fixes:
1207 - Document that all but one DirPort entry must have the NoAdvertise
1208 flag set. Fixes bug 10470; bugfix on 0.2.3.3-alpha / 0.2.3.16-alpha.
1211 Changes in version 0.2.4.20 - 2013-12-22
1212 Tor 0.2.4.20 fixes potentially poor random number generation for users
1213 who 1) use OpenSSL 1.0.0 or later, 2) set "HardwareAccel 1" in their
1214 torrc file, 3) have "Sandy Bridge" or "Ivy Bridge" Intel processors,
1215 and 4) have no state file in their DataDirectory (as would happen on
1216 first start). Users who generated relay or hidden service identity
1217 keys in such a situation should discard them and generate new ones.
1219 This release also fixes a logic error that caused Tor clients to build
1220 many more preemptive circuits than they actually need.
1223 - Do not allow OpenSSL engines to replace the PRNG, even when
1224 HardwareAccel is set. The only default builtin PRNG engine uses
1225 the Intel RDRAND instruction to replace the entire PRNG, and
1226 ignores all attempts to seed it with more entropy. That's
1227 cryptographically stupid: the right response to a new alleged
1228 entropy source is never to discard all previously used entropy
1229 sources. Fixes bug 10402; works around behavior introduced in
1230 OpenSSL 1.0.0. Diagnosis and investigation thanks to "coderman"
1232 - Fix assertion failure when AutomapHostsOnResolve yields an IPv6
1233 address. Fixes bug 10465; bugfix on 0.2.4.7-alpha.
1234 - Avoid launching spurious extra circuits when a stream is pending.
1235 This fixes a bug where any circuit that _wasn't_ unusable for new
1236 streams would be treated as if it were, causing extra circuits to
1237 be launched. Fixes bug 10456; bugfix on 0.2.4.12-alpha.
1240 - Avoid a crash bug when starting with a corrupted microdescriptor
1241 cache file. Fixes bug 10406; bugfix on 0.2.2.6-alpha.
1242 - If we fail to dump a previously cached microdescriptor to disk, avoid
1243 freeing duplicate data later on. Fixes bug 10423; bugfix on
1244 0.2.4.13-alpha. Spotted by "bobnomnom".
1247 Changes in version 0.2.4.19 - 2013-12-11
1248 The Tor 0.2.4 release series is dedicated to the memory of Aaron Swartz
1249 (1986-2013). Aaron worked on diverse projects including helping to guide
1250 Creative Commons, playing a key role in stopping SOPA/PIPA, bringing
1251 transparency to the U.S government's PACER documents, and contributing
1252 design and development for Tor and Tor2Web. Aaron was one of the latest
1253 martyrs in our collective fight for civil liberties and human rights,
1254 and his death is all the more painful because he was one of us.
1256 Tor 0.2.4.19, the first stable release in the 0.2.4 branch, features
1257 a new circuit handshake and link encryption that use ECC to provide
1258 better security and efficiency; makes relays better manage circuit
1259 creation requests; uses "directory guards" to reduce client enumeration
1260 risks; makes bridges collect and report statistics about the pluggable
1261 transports they support; cleans up and improves our geoip database;
1262 gets much closer to IPv6 support for clients, bridges, and relays; makes
1263 directory authorities use measured bandwidths rather than advertised
1264 ones when computing flags and thresholds; disables client-side DNS
1265 caching to reduce tracking risks; and fixes a big bug in bridge
1266 reachability testing. This release introduces two new design
1267 abstractions in the code: a new "channel" abstraction between circuits
1268 and or_connections to allow for implementing alternate relay-to-relay
1269 transports, and a new "circuitmux" abstraction storing the queue of
1270 circuits for a channel. The release also includes many stability,
1271 security, and privacy fixes.
1273 o Major features (new circuit handshake):
1274 - Tor now supports a new circuit extension handshake designed by Ian
1275 Goldberg, Douglas Stebila, and Berkant Ustaoglu. Our original
1276 circuit extension handshake, later called "TAP", was a bit slow
1277 (especially on the relay side), had a fragile security proof, and
1278 used weaker keys than we'd now prefer. The new circuit handshake
1279 uses Dan Bernstein's "curve25519" elliptic-curve Diffie-Hellman
1280 function, making it significantly more secure than the older
1281 handshake, and significantly faster. Tor can use one of two built-in
1282 pure-C curve25519-donna implementations by Adam Langley, or it
1283 can link against the "nacl" library for a tuned version if present.
1285 The built-in version is very fast for 64-bit systems when building
1286 with GCC. The built-in 32-bit version is still faster than the
1287 old TAP protocol, but using libnacl is better on most such hosts.
1289 Implements proposal 216; closes ticket 7202.
1291 o Major features (better link encryption):
1292 - Relays can now enable the ECDHE TLS ciphersuites when available
1293 and appropriate. These ciphersuites let us negotiate forward-secure
1294 TLS secret keys more safely and more efficiently than with our
1295 previous use of Diffie-Hellman modulo a 1024-bit prime. By default,
1296 public relays prefer the (faster) P224 group, and bridges prefer
1297 the (more common) P256 group; you can override this with the
1300 This feature requires clients running 0.2.3.17-beta or later,
1301 and requires both sides to be running OpenSSL 1.0.0 or later
1302 with ECC support. OpenSSL 1.0.1, with the compile-time option
1303 "enable-ec_nistp_64_gcc_128", is highly recommended.
1305 Implements the relay side of proposal 198; closes ticket 7200.
1307 - Re-enable TLS 1.1 and 1.2 when built with OpenSSL 1.0.1e or later.
1308 Resolves ticket 6055. (OpenSSL before 1.0.1 didn't have TLS 1.1 or
1309 1.2, and OpenSSL from 1.0.1 through 1.0.1d had bugs that prevented
1310 renegotiation from working with TLS 1.1 or 1.2, so we had disabled
1311 them to solve bug 6033.)
1313 o Major features (relay performance):
1314 - Instead of limiting the number of queued onionskins (aka circuit
1315 create requests) to a fixed, hard-to-configure number, we limit
1316 the size of the queue based on how many we expect to be able to
1317 process in a given amount of time. We estimate the time it will
1318 take to process an onionskin based on average processing time
1319 of previous onionskins. Closes ticket 7291. You'll never have to
1320 configure MaxOnionsPending again.
1321 - Relays process the new "NTor" circuit-level handshake requests
1322 with higher priority than the old "TAP" circuit-level handshake
1323 requests. We still process some TAP requests to not totally starve
1324 0.2.3 clients when NTor becomes popular. A new consensus parameter
1325 "NumNTorsPerTAP" lets us tune the balance later if we need to.
1326 Implements ticket 9574.
1328 o Major features (client bootstrapping resilience):
1329 - Add a new "FallbackDir" torrc option to use when we can't use
1330 a directory mirror from the consensus (either because we lack a
1331 consensus, or because they're all down). Currently, all authorities
1332 are fallbacks by default, and there are no other default fallbacks,
1333 but that will change. This option will allow us to give clients a
1334 longer list of servers to try to get a consensus from when first
1335 connecting to the Tor network, and thereby reduce load on the
1336 directory authorities. Implements proposal 206, "Preconfigured
1337 directory sources for bootstrapping". We also removed the old
1338 "FallbackNetworkstatus" option, since we never got it working well
1339 enough to use it. Closes bug 572.
1340 - If we have no circuits open, use a relaxed timeout (the
1341 95th-percentile cutoff) until a circuit succeeds. This heuristic
1342 should allow Tor to succeed at building circuits even when the
1343 network connection drastically changes. Should help with bug 3443.
1345 o Major features (use of guards):
1346 - Support directory guards (proposal 207): when possible, clients now
1347 use their entry guards for non-anonymous directory requests. This
1348 can help prevent client enumeration. Note that this behavior only
1349 works when we have a usable consensus directory, and when options
1350 about what to download are more or less standard. In the future we
1351 should re-bootstrap from our guards, rather than re-bootstrapping
1352 from the preconfigured list of directory sources that ships with
1353 Tor. Resolves ticket 6526.
1354 - Raise the default time that a client keeps an entry guard from
1355 "1-2 months" to "2-3 months", as suggested by Tariq Elahi's WPES
1356 2012 paper. (We would make it even longer, but we need better client
1357 load balancing first.) Also, make the guard lifetime controllable
1358 via a new GuardLifetime torrc option and a GuardLifetime consensus
1359 parameter. Start of a fix for bug 8240; bugfix on 0.1.1.11-alpha.
1361 o Major features (bridges with pluggable transports):
1362 - Bridges now report the pluggable transports they support to the
1363 bridge authority, so it can pass the supported transports on to
1364 bridgedb and/or eventually do reachability testing. Implements
1366 - Automatically forward the TCP ports of pluggable transport
1367 proxies using tor-fw-helper if PortForwarding is enabled. Implements
1370 o Major features (geoip database):
1371 - Maxmind began labelling Tor relays as being in country "A1",
1372 which breaks by-country node selection inside Tor. Now we use a
1373 script to replace "A1" ("Anonymous Proxy") entries in our geoip
1374 file with real country codes. This script fixes about 90% of "A1"
1375 entries automatically and uses manual country code assignments to
1376 fix the remaining 10%. See src/config/README.geoip for details.
1378 - Add GeoIP database for IPv6 addresses. The new config option
1380 - Update to the October 2 2013 Maxmind GeoLite Country database.
1382 o Major features (IPv6):
1383 - Clients who set "ClientUseIPv6 1" may connect to entry nodes over
1384 IPv6. Set "ClientPreferIPv6ORPort 1" to make this even more likely
1385 to happen. Implements ticket 5535.
1386 - All kind of relays, not just bridges, can now advertise an IPv6
1387 OR port. Implements ticket 6362.
1388 - Relays can now exit to IPv6 addresses: make sure that you have IPv6
1389 connectivity, then set the IPv6Exit flag to 1. Also make sure your
1390 exit policy reads as you would like: the address * applies to all
1391 address families, whereas *4 is IPv4 address only, and *6 is IPv6
1392 addresses only. On the client side, you'll need to wait for enough
1393 exits to support IPv6, apply the "IPv6Traffic" flag to a SocksPort,
1394 and use Socks5. Closes ticket 5547, implements proposal 117 as
1395 revised in proposal 208.
1396 - Bridge authorities now accept IPv6 bridge addresses and include
1397 them in network status documents. Implements ticket 5534.
1398 - Directory authorities vote on IPv6 OR ports. Implements ticket 6363.
1400 o Major features (directory authorities):
1401 - Directory authorities now prefer using measured bandwidths to
1402 advertised ones when computing flags and thresholds. Resolves
1404 - Directory authorities that vote measured bandwidths about more
1405 than a threshold number of relays now treat relays with
1406 unmeasured bandwidths as having bandwidth 0 when computing their
1407 flags. Resolves ticket 8435.
1408 - Directory authorities now support a new consensus method (17)
1409 where they cap the published bandwidth of relays for which
1410 insufficient bandwidth measurements exist. Fixes part of bug 2286.
1411 - Directory authorities that set "DisableV2DirectoryInfo_ 1" no longer
1412 serve any v2 directory information. Now we can test disabling the
1413 old deprecated v2 directory format, and see whether doing so has
1414 any effect on network load. Begins to fix bug 6783.
1416 o Major features (build and portability):
1417 - Switch to a nonrecursive Makefile structure. Now instead of each
1418 Makefile.am invoking other Makefile.am's, there is a master
1419 Makefile.am that includes the others. This change makes our build
1420 process slightly more maintainable, and improves parallelism for
1421 building with make -j. Original patch by Stewart Smith; various
1422 fixes by Jim Meyering.
1423 - Where available, we now use automake's "silent" make rules by
1424 default, so that warnings are easier to spot. You can get the old
1425 behavior with "make V=1". Patch by Stewart Smith for ticket 6522.
1426 - Resume building correctly with MSVC and Makefile.nmake. This patch
1427 resolves numerous bugs and fixes reported by ultramage, including
1428 7305, 7308, 7309, 7310, 7312, 7313, 7315, 7316, and 7669.
1430 o Security features:
1431 - Switch to a completely time-invariant approach for picking nodes
1432 weighted by bandwidth. Our old approach would run through the
1433 part of the loop after it had made its choice slightly slower
1434 than it ran through the part of the loop before it had made its
1435 choice. Addresses ticket 6538.
1436 - Disable the use of Guard nodes when in Tor2WebMode. Guard usage
1437 by tor2web clients allows hidden services to identify tor2web
1438 clients through their repeated selection of the same rendezvous
1439 and introduction point circuit endpoints (their guards). Resolves
1442 o Major bugfixes (relay denial of service):
1443 - When we have too much memory queued in circuits (according to a new
1444 MaxMemInCellQueues option), close the circuits that have the oldest
1445 queued cells, on the theory that those are most responsible for
1446 us running low on memory. This prevents us from running out of
1447 memory as a relay if circuits fill up faster than they can be
1448 drained. Fixes bugs 9063 and 9093; bugfix on the 54th commit of
1449 Tor. This bug is a further fix beyond bug 6252, whose fix was
1450 merged into 0.2.3.21-rc.
1451 - Reject bogus create and relay cells with 0 circuit ID or 0 stream
1452 ID: these could be used to create unexpected streams and circuits
1453 which would count as "present" to some parts of Tor but "absent"
1454 to others, leading to zombie circuits and streams or to a bandwidth
1455 denial-of-service. Fixes bug 7889; bugfix on every released version
1456 of Tor. Reported by "oftc_must_be_destroyed".
1457 - Avoid a bug where our response to TLS renegotiation under certain
1458 network conditions could lead to a busy-loop, with 100% CPU
1459 consumption. Fixes bug 5650; bugfix on 0.2.0.16-alpha.
1461 o Major bugfixes (asserts, crashes, leaks):
1462 - Prevent the get_freelists() function from running off the end of
1463 the list of freelists if it somehow gets an unrecognized
1464 allocation. Fixes bug 8844; bugfix on 0.2.0.16-alpha. Reported by
1466 - Avoid a memory leak where we would leak a consensus body when we
1467 find that a consensus which we couldn't previously verify due to
1468 missing certificates is now verifiable. Fixes bug 8719; bugfix
1470 - If we are unable to save a microdescriptor to the journal, do not
1471 drop it from memory and then reattempt downloading it. Fixes bug
1472 9645; bugfix on 0.2.2.6-alpha.
1473 - Fix an assertion failure that would occur when disabling the
1474 ORPort setting on a running Tor process while accounting was
1475 enabled. Fixes bug 6979; bugfix on 0.2.2.18-alpha.
1476 - Avoid an assertion failure on OpenBSD (and perhaps other BSDs)
1477 when an exit connection with optimistic data succeeds immediately
1478 rather than returning EINPROGRESS. Fixes bug 9017; bugfix on
1480 - Fix a memory leak that would occur whenever a configuration
1481 option changed. Fixes bug 8718; bugfix on 0.2.3.3-alpha.
1483 o Major bugfixes (relay rate limiting):
1484 - When a TLS write is partially successful but incomplete, remember
1485 that the flushed part has been flushed, and notice that bytes were
1486 actually written. Reported and fixed pseudonymously. Fixes bug 7708;
1487 bugfix on Tor 0.1.0.5-rc.
1488 - Raise the default BandwidthRate/BandwidthBurst values from 5MB/10MB
1489 to 1GB/1GB. The previous defaults were intended to be "basically
1490 infinite", but it turns out they're now limiting our 100mbit+
1491 relays and bridges. Fixes bug 6605; bugfix on 0.2.0.10-alpha (the
1492 last time we raised it).
1493 - No longer stop reading or writing on cpuworker connections when
1494 our rate limiting buckets go empty. Now we should handle circuit
1495 handshake requests more promptly. Resolves bug 9731.
1497 o Major bugfixes (client-side privacy):
1498 - When we mark a circuit as unusable for new circuits, have it
1499 continue to be unusable for new circuits even if MaxCircuitDirtiness
1500 is increased too much at the wrong time, or the system clock jumps
1501 backwards. Fixes bug 6174; bugfix on 0.0.2pre26.
1502 - If ClientDNSRejectInternalAddresses ("do not believe DNS queries
1503 which have resolved to internal addresses") is set, apply that
1504 rule to IPv6 as well. Fixes bug 8475; bugfix on 0.2.0.7-alpha.
1505 - When an exit relay rejects a stream with reason "exit policy", but
1506 we only know an exit policy summary (e.g. from the microdesc
1507 consensus) for it, do not mark the relay as useless for all exiting.
1508 Instead, mark just the circuit as unsuitable for that particular
1509 address. Fixes part of bug 7582; bugfix on 0.2.3.2-alpha.
1511 o Major bugfixes (stream isolation):
1512 - Allow applications to get proper stream isolation with
1513 IsolateSOCKSAuth. Many SOCKS5 clients that want to offer
1514 username/password authentication also offer "no authentication". Tor
1515 had previously preferred "no authentication", so the applications
1516 never actually sent Tor their auth details. Now Tor selects
1517 username/password authentication if it's offered. You can disable
1518 this behavior on a per-SOCKSPort basis via PreferSOCKSNoAuth. Fixes
1519 bug 8117; bugfix on 0.2.3.3-alpha.
1520 - Follow the socks5 protocol when offering username/password
1521 authentication. The fix for bug 8117 exposed this bug, and it
1522 turns out real-world applications like Pidgin do care. Bugfix on
1523 0.2.3.2-alpha; fixes bug 8879.
1525 o Major bugfixes (client circuit building):
1526 - Alter circuit build timeout measurement to start at the point
1527 where we begin the CREATE/CREATE_FAST step (as opposed to circuit
1528 initialization). This should make our timeout measurements more
1529 uniform. Previously, we were sometimes including ORconn setup time
1530 in our circuit build time measurements. Should resolve bug 3443.
1531 - If the circuit build timeout logic is disabled (via the consensus,
1532 or because we are an authority), then don't build testing circuits.
1533 Fixes bug 9657; bugfix on 0.2.2.14-alpha.
1535 o Major bugfixes (client-side DNS):
1536 - Turn off the client-side DNS cache by default. Updating and using
1537 the DNS cache is now configurable on a per-client-port
1538 level. SOCKSPort, DNSPort, etc lines may now contain
1539 {No,}Cache{IPv4,IPv6,}DNS lines to indicate that we shouldn't
1540 cache these types of DNS answers when we receive them from an
1541 exit node in response to an application request on this port, and
1542 {No,}UseCached{IPv4,IPv6,DNS} lines to indicate that if we have
1543 cached DNS answers of these types, we shouldn't use them. It's
1544 potentially risky to use cached DNS answers at the client, since
1545 doing so can indicate to one exit what answers we've gotten
1546 for DNS lookups in the past. With IPv6, this becomes especially
1547 problematic. Using cached DNS answers for requests on the same
1548 circuit would present less linkability risk, since all traffic
1549 on a circuit is already linkable, but it would also provide
1550 little performance benefit: the exit node caches DNS replies
1551 too. Implements a simplified version of Proposal 205. Implements
1554 o Major bugfixes (hidden service privacy):
1555 - Limit hidden service descriptors to at most ten introduction
1556 points, to slow one kind of guard enumeration. Fixes bug 9002;
1557 bugfix on 0.1.1.11-alpha.
1559 o Major bugfixes (directory fetching):
1560 - If the time to download the next old-style networkstatus is in
1561 the future, do not decline to consider whether to download the
1562 next microdescriptor networkstatus. Fixes bug 9564; bugfix on
1564 - We used to always request authority certificates by identity digest,
1565 meaning we'd get the newest one even when we wanted one with a
1566 different signing key. Then we would complain about being given
1567 a certificate we already had, and never get the one we really
1568 wanted. Now we use the "fp-sk/" resource as well as the "fp/"
1569 resource to request the one we want. Fixes bug 5595; bugfix on
1572 o Major bugfixes (bridge reachability):
1573 - Bridges now send AUTH_CHALLENGE cells during their v3 handshakes;
1574 previously they did not, which prevented them from receiving
1575 successful connections from relays for self-test or bandwidth
1576 testing. Also, when a relay is extending a circuit to a bridge,
1577 it needs to send a NETINFO cell, even when the bridge hasn't sent
1578 an AUTH_CHALLENGE cell. Fixes bug 9546; bugfix on 0.2.3.6-alpha.
1580 o Major bugfixes (control interface):
1581 - When receiving a new configuration file via the control port's
1582 LOADCONF command, do not treat the defaults file as absent.
1583 Fixes bug 9122; bugfix on 0.2.3.9-alpha.
1585 o Major bugfixes (directory authorities):
1586 - Stop marking every relay as having been down for one hour every
1587 time we restart a directory authority. These artificial downtimes
1588 were messing with our Stable and Guard flag calculations. Fixes
1589 bug 8218 (introduced by the fix for 1035). Bugfix on 0.2.2.23-alpha.
1590 - When computing directory thresholds, ignore any rejected-as-sybil
1591 nodes during the computation so that they can't influence Fast,
1592 Guard, etc. (We should have done this for proposal 109.) Fixes
1594 - When marking a node as a likely sybil, reset its uptime metrics
1595 to zero, so that it cannot time towards getting marked as Guard,
1596 Stable, or HSDir. (We should have done this for proposal 109.) Fixes
1598 - Fix a bug in the voting algorithm that could yield incorrect results
1599 when a non-naming authority declared too many flags. Fixes bug 9200;
1600 bugfix on 0.2.0.3-alpha.
1602 o Internal abstraction features:
1603 - Introduce new channel_t abstraction between circuits and
1604 or_connection_t to allow for implementing alternate OR-to-OR
1605 transports. A channel_t is an abstract object which can either be a
1606 cell-bearing channel, which is responsible for authenticating and
1607 handshaking with the remote OR and transmitting cells to and from
1608 it, or a listening channel, which spawns new cell-bearing channels
1609 at the request of remote ORs. Implements part of ticket 6465.
1610 - Make a channel_tls_t subclass of channel_t, adapting it to the
1611 existing or_connection_t code. The V2/V3 protocol handshaking
1612 code which formerly resided in command.c has been moved below the
1613 channel_t abstraction layer and may be found in channeltls.c now.
1614 Implements the rest of ticket 6465.
1615 - Introduce new circuitmux_t storing the queue of circuits for
1616 a channel; this encapsulates and abstracts the queue logic and
1617 circuit selection policy, and allows the latter to be overridden
1618 easily by switching out a policy object. The existing EWMA behavior
1619 is now implemented as a circuitmux_policy_t. Resolves ticket 6816.
1621 o New build requirements:
1622 - Tor now requires OpenSSL 0.9.8 or later. OpenSSL 1.0.0 or later is
1623 strongly recommended.
1624 - Tor maintainers now require Automake version 1.9 or later to build
1625 Tor from the Git repository. (Automake is not required when building
1626 from a source distribution.)
1628 o Minor features (protocol):
1629 - No longer include the "opt" prefix when generating routerinfos
1630 or v2 directories: it has been needless since Tor 0.1.2. Closes
1632 - Reject EXTEND cells sent to nonexistent streams. According to the
1633 spec, an EXTEND cell sent to _any_ nonzero stream ID is invalid, but
1634 we were only checking for stream IDs that were currently in use.
1635 Found while hunting for more instances of bug 6271. Bugfix on
1636 0.0.2pre8, which introduced incremental circuit construction.
1637 - Tor relays and clients now support a better CREATE/EXTEND cell
1638 format, allowing the sender to specify multiple address, identity,
1639 and handshake types. Implements Robert Ransom's proposal 200;
1641 - Reject as invalid most directory objects containing a NUL.
1642 Belt-and-suspender fix for bug 8037.
1644 o Minor features (security):
1645 - Clear keys and key-derived material left on the stack in
1646 rendservice.c and rendclient.c. Check return value of
1647 crypto_pk_write_private_key_to_string() in rend_service_load_keys().
1648 These fixes should make us more forward-secure against cold-boot
1649 attacks and the like. Fixes bug 2385.
1650 - Use our own weak RNG when we need a weak RNG. Windows's rand() and
1651 Irix's random() only return 15 bits; Solaris's random() returns more
1652 bits but its RAND_MAX says it only returns 15, and so on. Motivated
1653 by the fix for bug 7801; bugfix on 0.2.2.20-alpha.
1655 o Minor features (control protocol):
1656 - Add a "GETINFO signal/names" control port command. Implements
1658 - Provide default values for all options via "GETINFO config/defaults".
1659 Implements ticket 4971.
1660 - Allow an optional $ before the node identity digest in the
1661 controller command GETINFO ns/id/<identity>, for consistency with
1662 md/id/<identity> and desc/id/<identity>. Resolves ticket 7059.
1663 - Add CACHED keyword to ADDRMAP events in the control protocol
1664 to indicate whether a DNS result will be cached or not. Resolves
1666 - Generate bootstrapping status update events correctly when fetching
1667 microdescriptors. Fixes bug 9927.
1669 o Minor features (path selection):
1670 - When deciding whether we have enough descriptors to build circuits,
1671 instead of looking at raw relay counts, look at which fraction
1672 of (bandwidth-weighted) paths we're able to build. This approach
1673 keeps clients from building circuits if their paths are likely to
1674 stand out statistically. The default fraction of paths needed is
1675 taken from the consensus directory; you can override it with the
1676 new PathsNeededToBuildCircuits option. Fixes ticket 5956.
1677 - When any country code is listed in ExcludeNodes or ExcludeExitNodes,
1678 and we have GeoIP information, also exclude all nodes with unknown
1679 countries "??" and "A1". This behavior is controlled by the
1680 new GeoIPExcludeUnknown option: you can make such nodes always
1681 excluded with "GeoIPExcludeUnknown 1", and disable the feature
1682 with "GeoIPExcludeUnknown 0". Setting "GeoIPExcludeUnknown auto"
1683 gets you the default behavior. Implements feature 7706.
1685 o Minor features (hidden services):
1686 - Improve circuit build timeout handling for hidden services.
1687 In particular: adjust build timeouts more accurately depending
1688 upon the number of hop-RTTs that a particular circuit type
1689 undergoes. Additionally, launch intro circuits in parallel
1690 if they timeout, and take the first one to reply as valid.
1691 - The Tor client now ignores sub-domain components of a .onion
1692 address. This change makes HTTP "virtual" hosting
1693 possible: http://foo.aaaaaaaaaaaaaaaa.onion/ and
1694 http://bar.aaaaaaaaaaaaaaaa.onion/ can be two different websites
1695 hosted on the same hidden service. Implements proposal 204.
1696 - Enable Tor to read configuration, state, and key information from
1697 a FIFO. Previously Tor would only read from files with a positive
1698 stat.st_size. Code from meejah; fixes bug 6044.
1700 o Minor features (clients):
1701 - Teach bridge-using clients to avoid 0.2.2.x bridges when making
1702 microdescriptor-related dir requests, and only fall back to normal
1703 descriptors if none of their bridges can handle microdescriptors
1704 (as opposed to the fix in ticket 4013, which caused them to fall
1705 back to normal descriptors if *any* of their bridges preferred
1706 them). Resolves ticket 4994.
1707 - Tweak tor-fw-helper to accept an arbitrary amount of arbitrary
1708 TCP ports to forward. In the past it only accepted two ports:
1709 the ORPort and the DirPort.
1711 o Minor features (protecting client timestamps):
1712 - Clients no longer send timestamps in their NETINFO cells. These were
1713 not used for anything, and they provided one small way for clients
1714 to be distinguished from each other as they moved from network to
1715 network or behind NAT. Implements part of proposal 222.
1716 - Clients now round timestamps in INTRODUCE cells down to the nearest
1717 10 minutes. If a new Support022HiddenServices option is set to 0, or
1718 if it's set to "auto" and the feature is disabled in the consensus,
1719 the timestamp is sent as 0 instead. Implements part of proposal 222.
1720 - Stop sending timestamps in AUTHENTICATE cells. This is not such
1721 a big deal from a security point of view, but it achieves no actual
1722 good purpose, and isn't needed. Implements part of proposal 222.
1723 - Reduce down accuracy of timestamps in hidden service descriptors.
1724 Implements part of proposal 222.
1726 o Minor features (bridges):
1727 - Make bridge relays check once a minute for whether their IP
1728 address has changed, rather than only every 15 minutes. Resolves
1730 - Bridge statistics now count bridge clients connecting over IPv6:
1731 bridge statistics files now list "bridge-ip-versions" and
1732 extra-info documents list "geoip6-db-digest". The control protocol
1733 "CLIENTS_SEEN" and "ip-to-country" queries now support IPv6. Initial
1734 implementation by "shkoo", addressing ticket 5055.
1735 - Add a new torrc option "ServerTransportListenAddr" to let bridge
1736 operators select the address where their pluggable transports will
1737 listen for connections. Resolves ticket 7013.
1738 - Randomize the lifetime of our SSL link certificate, so censors can't
1739 use the static value for filtering Tor flows. Resolves ticket 8443;
1740 related to ticket 4014 which was included in 0.2.2.33.
1742 o Minor features (relays):
1743 - Option OutboundBindAddress can be specified multiple times and
1744 accepts IPv6 addresses. Resolves ticket 6876.
1746 o Minor features (IPv6, client side):
1747 - AutomapHostsOnResolve now supports IPv6 addresses. By default, we
1748 prefer to hand out virtual IPv6 addresses, since there are more of
1749 them and we can't run out. To override this behavior and make IPv4
1750 addresses preferred, set NoPreferIPv6Automap on whatever SOCKSPort
1751 or DNSPort you're using for resolving. Implements ticket 7571.
1752 - AutomapHostsOnResolve responses are now randomized, to avoid
1753 annoying situations where Tor is restarted and applications
1754 connect to the wrong addresses.
1755 - Never try more than 1000 times to pick a new virtual address when
1756 AutomapHostsOnResolve is set. That's good enough so long as we
1757 aren't close to handing out our entire virtual address space;
1758 if you're getting there, it's best to switch to IPv6 virtual
1761 o Minor features (IPv6, relay/authority side):
1762 - New config option "AuthDirHasIPv6Connectivity 1" that directory
1763 authorities should set if they have IPv6 connectivity and want to
1764 do reachability tests for IPv6 relays. Implements feature 5974.
1765 - A relay with an IPv6 OR port now sends that address in NETINFO
1766 cells (in addition to its other address). Implements ticket 6364.
1768 o Minor features (directory authorities):
1769 - Directory authorities no long accept descriptors for any version of
1770 Tor before 0.2.2.35, or for any 0.2.3 release before 0.2.3.10-alpha.
1771 These versions are insecure, unsupported, or both. Implements
1773 - When directory authorities are computing thresholds for flags,
1774 never let the threshold for the Fast flag fall below 4096
1775 bytes. Also, do not consider nodes with extremely low bandwidths
1776 when deciding thresholds for various directory flags. This change
1777 should raise our threshold for Fast relays, possibly in turn
1778 improving overall network performance; see ticket 1854. Resolves
1780 - Directory authorities now include inside each vote a statement of
1781 the performance thresholds they used when assigning flags.
1782 Implements ticket 8151.
1783 - Add an "ignoring-advertised-bws" boolean to the flag-threshold lines
1784 in directory authority votes to describe whether they have enough
1785 measured bandwidths to ignore advertised (relay descriptor)
1786 bandwidth claims. Resolves ticket 8711.
1788 o Minor features (path bias detection):
1789 - Path Use Bias: Perform separate accounting for successful circuit
1790 use. Keep separate statistics on stream attempt rates versus stream
1791 success rates for each guard. Provide configurable thresholds to
1792 determine when to emit log messages or disable use of guards that
1793 fail too many stream attempts. Resolves ticket 7802.
1794 - Create three levels of Path Bias log messages, as opposed to just
1795 two. These are configurable via consensus as well as via the torrc
1796 options PathBiasNoticeRate, PathBiasWarnRate, PathBiasExtremeRate.
1797 The default values are 0.70, 0.50, and 0.30 respectively.
1798 - Separate the log message levels from the decision to drop guards,
1799 which also is available via torrc option PathBiasDropGuards.
1800 PathBiasDropGuards still defaults to 0 (off).
1801 - Deprecate PathBiasDisableRate in favor of PathBiasDropGuards
1802 in combination with PathBiasExtremeRate.
1803 - Increase the default values for PathBiasScaleThreshold and
1804 PathBiasCircThreshold from (200, 20) to (300, 150).
1805 - Add in circuit usage accounting to path bias. If we try to use a
1806 built circuit but fail for any reason, it counts as path bias.
1807 Certain classes of circuits where the adversary gets to pick your
1808 destination node are exempt from this accounting. Usage accounting
1809 can be specifically disabled via consensus parameter or torrc.
1810 - Convert all internal path bias state to double-precision floating
1811 point, to avoid roundoff error and other issues.
1812 - Only record path bias information for circuits that have completed
1813 *two* hops. Assuming end-to-end tagging is the attack vector, this
1814 makes us more resilient to ambient circuit failure without any
1815 detection capability loss.
1817 o Minor features (build):
1818 - Tor now builds correctly on Bitrig, an OpenBSD fork. Patch from
1819 dhill. Resolves ticket 6982.
1820 - Compile on win64 using mingw64. Fixes bug 7260; patches from
1822 - Work correctly on Unix systems where EAGAIN and EWOULDBLOCK are
1823 separate error codes; or at least, don't break for that reason.
1824 Fixes bug 7935. Reported by "oftc_must_be_destroyed".
1826 o Build improvements (autotools):
1827 - Warn if building on a platform with an unsigned time_t: there
1828 are too many places where Tor currently assumes that time_t can
1829 hold negative values. We'd like to fix them all, but probably
1831 - Do not report status verbosely from autogen.sh unless the -v flag
1832 is specified. Fixes issue 4664. Patch from Onizuka.
1833 - Detect and reject attempts to build Tor with threading support
1834 when OpenSSL has been compiled without threading support.
1836 - Try to detect if we are ever building on a platform where
1837 memset(...,0,...) does not set the value of a double to 0.0. Such
1838 platforms are permitted by the C standard, though in practice
1839 they're pretty rare (since IEEE 754 is nigh-ubiquitous). We don't
1840 currently support them, but it's better to detect them and fail
1841 than to perform erroneously.
1842 - We no longer warn so much when generating manpages from their
1844 - Use Ville Laurikari's implementation of AX_CHECK_SIGN() to determine
1845 the signs of types during autoconf. This is better than our old
1846 approach, which didn't work when cross-compiling.
1848 o Minor features (log messages, warnings):
1849 - Detect when we're running with a version of OpenSSL other than the
1850 one we compiled with. This conflict has occasionally given people
1851 hard-to-track-down errors.
1852 - Warn users who run hidden services on a Tor client with
1853 UseEntryGuards disabled that their hidden services will be
1854 vulnerable to http://freehaven.net/anonbib/#hs-attack06 (the
1855 attack which motivated Tor to support entry guards in the first
1856 place). Resolves ticket 6889.
1857 - Warn when we are binding low ports when hibernation is enabled;
1858 previously we had warned when we were _advertising_ low ports with
1859 hibernation enabled. Fixes bug 7285; bugfix on 0.2.3.9-alpha.
1860 - Issue a warning when running with the bufferevents backend enabled.
1861 It's still not stable, and people should know that they're likely
1862 to hit unexpected problems. Closes ticket 9147.
1864 o Minor features (log messages, notices):
1865 - Refactor resolve_my_address() so it returns the method by which we
1866 decided our public IP address (explicitly configured, resolved from
1867 explicit hostname, guessed from interfaces, learned by gethostname).
1868 Now we can provide more helpful log messages when a relay guesses
1869 its IP address incorrectly (e.g. due to unexpected lines in
1870 /etc/hosts). Resolves ticket 2267.
1871 - Track how many "TAP" and "NTor" circuit handshake requests we get,
1872 and how many we complete, and log it every hour to help relay
1873 operators follow trends in network load. Addresses ticket 9658.
1875 o Minor features (log messages, diagnostics):
1876 - If we fail to free a microdescriptor because of bug 7164, log
1877 the filename and line number from which we tried to free it.
1878 - We compute the overhead from passing onionskins back and forth to
1879 cpuworkers, and report it when dumping statistics in response to
1880 SIGUSR1. Supports ticket 7291.
1881 - Add another diagnostic to the heartbeat message: track and log
1882 overhead that TLS is adding to the data we write. If this is
1883 high, we are sending too little data to SSL_write at a time.
1884 Diagnostic for bug 7707.
1885 - Log packaged cell fullness as part of the heartbeat message.
1886 Diagnosis to try to determine the extent of bug 7743.
1887 - Add more detail to a log message about relaxed timeouts, to help
1889 - When learning a fingerprint for a bridge, log its corresponding
1890 transport type. Implements ticket 7896.
1891 - Warn more aggressively when flushing microdescriptors to a
1892 microdescriptor cache fails, in an attempt to mitigate bug 8031,
1893 or at least make it more diagnosable.
1894 - Improve the log message when "Bug/attack: unexpected sendme cell
1895 from client" occurs, to help us track bug 8093.
1896 - Improve debugging output to help track down bug 8185 ("Bug:
1897 outgoing relay cell has n_chan==NULL. Dropping.")
1899 o Minor features (log messages, quieter bootstrapping):
1900 - Log fewer lines at level "notice" about our OpenSSL and Libevent
1901 versions and capabilities when everything is going right. Resolves
1902 part of ticket 6736.
1903 - Omit the first heartbeat log message, because it never has anything
1904 useful to say, and it clutters up the bootstrapping messages.
1905 Resolves ticket 6758.
1906 - Don't log about reloading the microdescriptor cache at startup. Our
1907 bootstrap warnings are supposed to tell the user when there's a
1908 problem, and our bootstrap notices say when there isn't. Resolves
1909 ticket 6759; bugfix on 0.2.2.6-alpha.
1910 - Don't log "I learned some more directory information" when we're
1911 reading cached directory information. Reserve it for when new
1912 directory information arrives in response to a fetch. Resolves
1914 - Don't complain about bootstrapping problems while hibernating.
1915 These complaints reflect a general code problem, but not one
1916 with any problematic effects (no connections are actually
1917 opened). Fixes part of bug 7302; bugfix on 0.2.3.2-alpha.
1919 o Minor features (testing):
1920 - In our testsuite, create temporary directories with a bit more
1921 entropy in their name to make name collisions less likely. Fixes
1923 - Add benchmarks for DH (1024-bit multiplicative group) and ECDH
1924 (P-256) Diffie-Hellman handshakes to src/or/bench.
1925 - Add benchmark functions to test onion handshake performance.
1928 - The DirServer option is now DirAuthority, for consistency with
1929 current naming patterns. You can still use the old DirServer form.
1931 o Minor bugfixes (protocol):
1932 - Fix the handling of a TRUNCATE cell when it arrives while the
1933 circuit extension is in progress. Fixes bug 7947; bugfix on 0.0.7.1.
1934 - When a Tor client gets a "truncated" relay cell, the first byte of
1935 its payload specifies why the circuit was truncated. We were
1936 ignoring this 'reason' byte when tearing down the circuit, resulting
1937 in the controller not being told why the circuit closed. Now we
1938 pass the reason from the truncated cell to the controller. Bugfix
1939 on 0.1.2.3-alpha; fixes bug 7039.
1940 - Fix a misframing issue when reading the version numbers in a
1941 VERSIONS cell. Previously we would recognize [00 01 00 02] as
1942 'version 1, version 2, and version 0x100', when it should have
1943 only included versions 1 and 2. Fixes bug 8059; bugfix on
1944 0.2.0.10-alpha. Reported pseudonymously.
1945 - Make the format and order of STREAM events for DNS lookups
1946 consistent among the various ways to launch DNS lookups. Fixes
1947 bug 8203; bugfix on 0.2.0.24-rc. Patch by "Desoxy".
1949 o Minor bugfixes (syscalls and disk interaction):
1950 - Always check the return values of functions fcntl() and
1951 setsockopt(). We don't believe these are ever actually failing in
1952 practice, but better safe than sorry. Also, checking these return
1953 values should please analysis tools like Coverity. Patch from
1954 'flupzor'. Fixes bug 8206; bugfix on all versions of Tor.
1955 - Avoid double-closing the listener socket in our socketpair()
1956 replacement (used on Windows) in the case where the addresses on
1957 our opened sockets don't match what we expected. Fixes bug 9400;
1958 bugfix on 0.0.2pre7. Found by Coverity.
1959 - Correctly store microdescriptors and extrainfo descriptors that
1960 include an internal NUL byte. Fixes bug 8037; bugfix on
1961 0.2.0.1-alpha. Bug reported by "cypherpunks".
1962 - If for some reason we fail to write a microdescriptor while
1963 rebuilding the cache, do not let the annotations from that
1964 microdescriptor linger in the cache file, and do not let the
1965 microdescriptor stay recorded as present in its old location.
1966 Fixes bug 9047; bugfix on 0.2.2.6-alpha.
1967 - Use direct writes rather than stdio when building microdescriptor
1968 caches, in an attempt to mitigate bug 8031, or at least make it
1971 o Minor fixes (config options):
1972 - Warn and fail if a server is configured not to advertise any
1973 ORPorts at all. (We need *something* to put in our descriptor,
1974 or we just won't work.)
1975 - Behave correctly when the user disables LearnCircuitBuildTimeout
1976 but doesn't tell us what they would like the timeout to be. Fixes
1977 bug 6304; bugfix on 0.2.2.14-alpha.
1978 - Rename the (internal-use-only) UsingTestingNetworkDefaults option
1979 to start with a triple-underscore so the controller won't touch it.
1980 Patch by Meejah. Fixes bug 3155. Bugfix on 0.2.2.23-alpha.
1981 - Rename the (testing-use-only) _UseFilteringSSLBufferevents option
1982 so it doesn't start with _. Fixes bug 3155. Bugfix on 0.2.3.1-alpha.
1983 - When autodetecting the number of CPUs, use the number of available
1984 CPUs in preference to the number of configured CPUs. Inform the
1985 user if this reduces the number of available CPUs. Fixes bug 8002;
1986 bugfix on 0.2.3.1-alpha.
1987 - Command-line option "--version" implies "--quiet". Fixes bug 6997.
1988 - Make it an error when you set EntryNodes but disable UseGuardNodes,
1989 since it will (surprisingly to some users) ignore EntryNodes. Fixes
1990 bug 8180; bugfix on 0.2.3.11-alpha.
1991 - Avoid overflows when the user sets MaxCircuitDirtiness to a
1992 ridiculously high value, by imposing a (ridiculously high) 30-day
1993 maximum on MaxCircuitDirtiness.
1995 o Minor bugfixes (control protocol):
1996 - Stop sending a stray "(null)" in some cases for the server status
1997 "EXTERNAL_ADDRESS" controller event. Resolves bug 8200; bugfix
1999 - The ADDRMAP command can no longer generate an ill-formed error
2000 code on a failed MAPADDRESS. It now says "internal" rather than
2001 an English sentence fragment with spaces in the middle. Bugfix on
2004 o Minor bugfixes (clients / edges):
2005 - When we receive a RELAY_END cell with the reason DONE, or with no
2006 reason, before receiving a RELAY_CONNECTED cell, report the SOCKS
2007 status as "connection refused". Previously we reported these cases
2008 as success but then immediately closed the connection. Fixes bug
2009 7902; bugfix on 0.1.0.1-rc. Reported by "oftc_must_be_destroyed".
2010 - If the guard we choose first doesn't answer, we would try the
2011 second guard, but once we connected to the second guard we would
2012 abandon it and retry the first one, slowing down bootstrapping.
2013 The fix is to treat all our initially chosen guards as acceptable
2014 to use. Fixes bug 9946; bugfix on 0.1.1.11-alpha.
2015 - When choosing which stream on a formerly stalled circuit to wake
2016 first, make better use of the platform's weak RNG. Previously,
2017 we had been using the % ("modulo") operator to try to generate a
2018 1/N chance of picking each stream, but this behaves badly with
2019 many platforms' choice of weak RNG. Fixes bug 7801; bugfix on
2022 o Minor bugfixes (path bias detection):
2023 - If the state file's path bias counts are invalid (presumably from a
2024 buggy Tor prior to 0.2.4.10-alpha), make them correct. Also add
2025 additional checks and log messages to the scaling of Path Bias
2026 counts, in case there still are remaining issues with scaling.
2027 Should help resolve bug 8235.
2028 - Prevent rounding error in path bias counts when scaling
2029 them down, and use the correct scale factor default. Also demote
2030 some path bias related log messages down a level and make others
2031 less scary sounding. Fixes bug 6647. Bugfix on 0.2.3.17-beta.
2032 - Remove a source of rounding error during path bias count scaling;
2033 don't count cannibalized circuits as used for path bias until we
2034 actually try to use them; and fix a circuit_package_relay_cell()
2035 warning message about n_chan==NULL. Fixes bug 7802.
2036 - Paste the description for PathBias parameters from the man
2037 page into or.h, so the code documents them too. Fixes bug 7982;
2038 bugfix on 0.2.3.17-beta.
2040 o Minor bugfixes (relays):
2041 - Stop trying to resolve our hostname so often (e.g. every time we
2042 think about doing a directory fetch). Now we reuse the cached
2043 answer in some cases. Fixes bugs 1992 (bugfix on 0.2.0.20-rc)
2044 and 2410 (bugfix on 0.1.2.2-alpha).
2045 - When examining the list of network interfaces to find our address,
2046 do not consider non-running or disabled network interfaces. Fixes
2047 bug 9904; bugfix on 0.2.3.11-alpha. Patch from "hantwister".
2049 o Minor bugfixes (blocking resistance):
2050 - Only disable TLS session ticket support when running as a TLS
2051 server. Now clients will blend better with regular Firefox
2052 connections. Fixes bug 7189; bugfix on Tor 0.2.3.23-rc.
2054 o Minor bugfixes (IPv6):
2055 - Use square brackets around IPv6 addresses in numerous places
2056 that needed them, including log messages, HTTPS CONNECT proxy
2057 requests, TransportProxy statefile entries, and pluggable transport
2058 extra-info lines. Fixes bug 7011; patch by David Fifield.
2060 o Minor bugfixes (directory authorities):
2061 - Reject consensus votes with more than 64 known-flags. We aren't even
2062 close to that limit yet, and our code doesn't handle it correctly.
2063 Fixes bug 6833; bugfix on 0.2.0.1-alpha.
2064 - Correctly handle votes with more than 31 flags. Fixes bug 6853;
2065 bugfix on 0.2.0.3-alpha.
2067 o Minor bugfixes (memory leaks):
2068 - Avoid leaking memory if we fail to compute a consensus signature
2069 or we generate a consensus we can't parse. Bugfix on 0.2.0.5-alpha.
2070 - Fix a memory leak when receiving headers from an HTTPS proxy. Bugfix
2071 on 0.2.1.1-alpha; fixes bug 7816.
2072 - Fix a memory leak during safe-cookie controller authentication.
2073 Bugfix on 0.2.3.13-alpha; fixes bug 7816.
2074 - Free some more still-in-use memory at exit, to make hunting for
2075 memory leaks easier. Resolves bug 7029.
2077 o Minor bugfixes (code correctness):
2078 - Increase the width of the field used to remember a connection's
2079 link protocol version to two bytes. Harmless for now, since the
2080 only currently recognized versions are one byte long. Reported
2081 pseudonymously. Fixes bug 8062; bugfix on 0.2.0.10-alpha.
2082 - Fix a crash when debugging unit tests on Windows: deallocate a
2083 shared library with FreeLibrary, not CloseHandle. Fixes bug 7306;
2084 bugfix on 0.2.2.17-alpha. Reported by "ultramage".
2085 - When detecting the largest possible file descriptor (in order to
2086 close all file descriptors when launching a new program), actually
2087 use _SC_OPEN_MAX. The old code for doing this was very, very broken.
2088 Fixes bug 8209; bugfix on 0.2.3.1-alpha. Found by Coverity; this
2090 - Avoid a crash if we fail to generate an extrainfo descriptor.
2091 Fixes bug 8208; bugfix on 0.2.3.16-alpha. Found by Coverity;
2093 - Avoid an off-by-one error when checking buffer boundaries when
2094 formatting the exit status of a pluggable transport helper.
2095 This is probably not an exploitable bug, but better safe than
2096 sorry. Fixes bug 9928; bugfix on 0.2.3.18-rc. Bug found by
2098 - Get rid of a couple of harmless clang warnings, where we compared
2099 enums to ints. These warnings are newly introduced in clang 3.2.
2101 o Minor bugfixes (code cleanliness):
2102 - Avoid use of reserved identifiers in our C code. The C standard
2103 doesn't like us declaring anything that starts with an
2104 underscore, so let's knock it off before we get in trouble. Fix
2105 for bug 1031; bugfix on the first Tor commit.
2106 - Fix round_to_power_of_2() so it doesn't invoke undefined behavior
2107 with large values. This situation was untriggered, but nevertheless
2108 incorrect. Fixes bug 6831; bugfix on 0.2.0.1-alpha.
2109 - Fix an impossible buffer overrun in the AES unit tests. Fixes
2110 bug 8845; bugfix on 0.2.0.7-alpha. Found by eugenis.
2111 - Fix handling of rendezvous client authorization types over 8.
2112 Fixes bug 6861; bugfix on 0.2.1.5-alpha.
2113 - Remove a couple of extraneous semicolons that were upsetting the
2114 cparser library. Patch by Christian Grothoff. Fixes bug 7115;
2115 bugfix on 0.2.2.1-alpha.
2116 - When complaining about a client port on a public address, log
2117 which address we're complaining about. Fixes bug 4020; bugfix on
2118 0.2.3.3-alpha. Patch by Tom Fitzhenry.
2120 o Minor bugfixes (log messages, warnings):
2121 - If we encounter a write failure on a SOCKS connection before we
2122 finish our SOCKS handshake, don't warn that we closed the
2123 connection before we could send a SOCKS reply. Fixes bug 8427;
2124 bugfix on 0.1.0.1-rc.
2125 - Fix a directory authority warn caused when we have a large amount
2126 of badexit bandwidth. Fixes bug 8419; bugfix on 0.2.2.10-alpha.
2127 - Downgrade "Failed to hand off onionskin" messages to "debug"
2128 severity, since they're typically redundant with the "Your computer
2129 is too slow" messages. Fixes bug 7038; bugfix on 0.2.2.16-alpha.
2130 - Avoid spurious warnings when configuring multiple client ports of
2131 which only some are nonlocal. Previously, we had claimed that some
2132 were nonlocal when in fact they weren't. Fixes bug 7836; bugfix on
2135 o Minor bugfixes (log messages, other):
2136 - Fix log messages and comments to avoid saying "GMT" when we mean
2137 "UTC". Fixes bug 6113.
2138 - When rejecting a configuration because we were unable to parse a
2139 quoted string, log an actual error message. Fixes bug 7950; bugfix
2141 - Correctly recognize that [::1] is a loopback address. Fixes
2142 bug 8377; bugfix on 0.2.1.3-alpha.
2143 - Don't log inappropriate heartbeat messages when hibernating: a
2144 hibernating node is _expected_ to drop out of the consensus,
2145 decide it isn't bootstrapped, and so forth. Fixes bug 7302;
2146 bugfix on 0.2.3.1-alpha.
2147 - Eliminate several instances where we use "Nickname=ID" to refer to
2148 nodes in logs. Use "Nickname (ID)" instead. (Elsewhere, we still use
2149 "$ID=Nickname", which is also acceptable.) Fixes bug 7065. Bugfix
2152 o Minor bugfixes (build):
2153 - Fix some bugs in tor-fw-helper-natpmp when trying to build and
2154 run it on Windows. More bugs likely remain. Patch from Gisle Vanem.
2155 Fixes bug 7280; bugfix on 0.2.3.1-alpha.
2157 o Documentation fixes:
2158 - Make the torify manpage no longer refer to tsocks; torify hasn't
2159 supported tsocks since 0.2.3.14-alpha.
2160 - Make the tor manpage no longer reference tsocks.
2161 - Fix the GeoIPExcludeUnknown documentation to refer to
2162 ExcludeExitNodes rather than the currently nonexistent
2163 ExcludeEntryNodes. Spotted by "hamahangi" on tor-talk.
2164 - Resolve a typo in torrc.sample.in. Fixes bug 6819; bugfix on
2166 - Say "KBytes" rather than "KB" in the man page (for various values
2167 of K), to further reduce confusion about whether Tor counts in
2168 units of memory or fractions of units of memory. Resolves ticket 7054.
2169 - Update tor-fw-helper.1.txt and tor-fw-helper.c to make option
2170 names match. Fixes bug 7768.
2171 - Fix the documentation of HeartbeatPeriod to say that the heartbeat
2172 message is logged at notice, not at info.
2173 - Clarify the usage and risks of setting the ContactInfo torrc line
2174 for your relay or bridge. Resolves ticket 9854.
2175 - Add anchors to the manpage so we can link to the html version of
2176 the documentation for specific options. Resolves ticket 9866.
2177 - Replace remaining references to DirServer in man page and
2178 log entries. Resolves ticket 10124.
2181 - Stop exporting estimates of v2 and v3 directory traffic shares
2182 in extrainfo documents. They were unneeded and sometimes inaccurate.
2183 Also stop exporting any v2 directory request statistics. Resolves
2185 - Drop support for detecting and warning about versions of Libevent
2186 before 1.3e. Nothing reasonable ships with them any longer; warning
2187 the user about them shouldn't be needed. Resolves ticket 6826.
2188 - Now that all versions before 0.2.2.x are disallowed, we no longer
2189 need to work around their missing features. Remove a bunch of
2193 - The tor-tsocks.conf is no longer distributed or installed. We
2194 recommend that tsocks users use torsocks instead. Resolves
2196 - Remove some of the older contents of doc/ as obsolete; move others
2197 to torspec.git. Fixes bug 8965.
2199 o Code simplification:
2200 - Avoid using character buffers when constructing most directory
2201 objects: this approach was unwieldy and error-prone. Instead,
2202 build smartlists of strings, and concatenate them when done.
2203 - Rename "isin" functions to "contains", for grammar. Resolves
2205 - Rename Tor's logging function log() to tor_log(), to avoid conflicts
2206 with the natural logarithm function from the system libm. Resolves
2208 - Start using OpenBSD's implementation of queue.h, so that we don't
2209 need to hand-roll our own pointer and list structures whenever we
2210 need them. (We can't rely on a sys/queue.h, since some operating
2211 systems don't have them, and the ones that do have them don't all
2212 present the same extensions.)
2213 - Start using OpenBSD's implementation of queue.h (originally by
2215 - Enhance our internal sscanf replacement so that we can eliminate
2216 the last remaining uses of the system sscanf. (Though those uses
2217 of sscanf were safe, sscanf itself is generally error prone, so
2218 we want to eliminate when we can.) Fixes ticket 4195 and Coverity
2220 - Replace all calls to snprintf() outside of src/ext with
2221 tor_snprintf(). Also remove the #define to replace snprintf with
2222 _snprintf on Windows; they have different semantics, and all of
2223 our callers should be using tor_snprintf() anyway. Fixes bug 7304.
2226 - Add a wrapper function for the common "log a message with a
2228 - Split the onion.c file into separate modules for the onion queue
2229 and the different handshakes it supports.
2230 - Move the client-side address-map/virtual-address/DNS-cache code
2231 out of connection_edge.c into a new addressmap.c module.
2232 - Move the entry node code from circuitbuild.c to its own file.
2233 - Move the circuit build timeout tracking code from circuitbuild.c
2235 - Source files taken from other packages now reside in src/ext;
2236 previously they were scattered around the rest of Tor.
2237 - Move the generic "config" code into a new file, and have "config.c"
2238 hold only torrc- and state-related code. Resolves ticket 6823.
2239 - Move the core of our "choose a weighted element at random" logic
2240 into its own function, and give it unit tests. Now the logic is
2241 testable, and a little less fragile too.
2242 - Move ipv6_preferred from routerinfo_t to node_t. Addresses bug 4620.
2243 - Move last_reachable and testing_since from routerinfo_t to node_t.
2244 Implements ticket 5529.
2245 - Add replaycache_t structure, functions and unit tests, then refactor
2246 rend_service_introduce() to be more clear to read, improve, debug,
2247 and test. Resolves bug 6177.
2250 - Remove some now-needless code that tried to aggressively flush
2251 OR connections as data was added to them. Since 0.2.0.1-alpha, our
2252 cell queue logic has saved us from the failure mode that this code
2253 was supposed to prevent. Removing this code will limit the number
2254 of baroque control flow paths through Tor's network logic. Reported
2255 pseudonymously on IRC. Fixes bug 6468; bugfix on 0.2.0.1-alpha.
2256 - Remove unused code for parsing v1 directories and "running routers"
2257 documents. Fixes bug 6887.
2258 - Remove the marshalling/unmarshalling code for sending requests to
2259 cpuworkers over a socket, and instead just send structs. The
2260 recipient will always be the same Tor binary as the sender, so
2261 any encoding is overkill.
2262 - Remove the testing_since field of node_t, which hasn't been used
2263 for anything since 0.2.0.9-alpha.
2264 - Finally remove support for malloc_good_size and malloc_usable_size.
2265 We had hoped that these functions would let us eke a little more
2266 memory out of our malloc implementation. Unfortunately, the only
2267 implementations that provided these functions are also ones that
2268 are already efficient about not overallocation: they never got us
2269 more than 7 or so bytes per allocation. Removing them saves us a
2270 little code complexity and a nontrivial amount of build complexity.
2273 Changes in version 0.2.3.25 - 2012-11-19
2274 The Tor 0.2.3 release series is dedicated to the memory of Len "rabbi"
2275 Sassaman (1980-2011), a long-time cypherpunk, anonymity researcher,
2276 Mixmaster maintainer, Pynchon Gate co-designer, CodeCon organizer,
2277 programmer, and friend. Unstinting in his dedication to the cause of
2278 freedom, he inspired and helped many of us as we began our work on
2279 anonymity, and inspires us still. Please honor his memory by writing
2280 software to protect people's freedoms, and by helping others to do so.
2282 Tor 0.2.3.25, the first stable release in the 0.2.3 branch, features
2283 significantly reduced directory overhead (via microdescriptors),
2284 enormous crypto performance improvements for fast relays on new
2285 enough hardware, a new v3 TLS handshake protocol that can better
2286 resist fingerprinting, support for protocol obfuscation plugins (aka
2287 pluggable transports), better scalability for hidden services, IPv6
2288 support for bridges, performance improvements like allowing clients
2289 to skip the first round-trip on the circuit ("optimistic data") and
2290 refilling token buckets more often, a new "stream isolation" design
2291 to isolate different applications on different circuits, and many
2292 stability, security, and privacy fixes.
2294 Major features (v3 directory protocol):
2295 - Clients now use microdescriptors instead of regular descriptors
2296 to build circuits. Microdescriptors are authority-generated
2297 summaries of regular descriptors' contents, designed to change very
2298 rarely (see proposal 158 for details). This feature is designed
2299 to save bandwidth, especially for clients on slow internet
2300 connections. Use "UseMicrodescriptors 0" to disable it.
2301 - Caches now download, cache, and serve microdescriptors, as well
2302 as multiple "flavors" of the consensus, including a flavor that
2303 describes microdescriptors.
2305 o Major features (build hardening):
2306 - Enable gcc and ld hardening by default. Resolves ticket 5210.
2308 o Major features (relay scaling):
2309 - When built to use OpenSSL 1.0.1, and built for an x86 or x86_64
2310 instruction set, take advantage of OpenSSL's AESNI, bitsliced, or
2311 vectorized AES implementations as appropriate. These can be much,
2312 much faster than other AES implementations.
2313 - When using OpenSSL 1.0.0 or later, use OpenSSL's counter mode
2314 implementation. It makes AES_CTR about 7% faster than our old one
2315 (which was about 10% faster than the one OpenSSL used to provide).
2316 Resolves ticket 4526.
2317 - Use OpenSSL's EVP interface for AES encryption, so that all AES
2318 operations can use hardware acceleration (if present). Resolves
2320 - Unconditionally use OpenSSL's AES implementation instead of our
2321 old built-in one. OpenSSL's AES has been better for a while, and
2322 relatively few servers should still be on any version of OpenSSL
2323 that doesn't have good optimized assembly AES.
2325 o Major features (blocking resistance):
2326 - Update TLS cipher list to match Firefox 8 and later. Resolves
2328 - Remove support for clients falsely claiming to support standard
2329 ciphersuites that they can actually provide. As of modern OpenSSL
2330 versions, it's not necessary to fake any standard ciphersuite,
2331 and doing so prevents us from using better ciphersuites in the
2332 future, since servers can't know whether an advertised ciphersuite
2333 is really supported or not. Some hosts -- notably, ones with very
2334 old versions of OpenSSL or where OpenSSL has been built with ECC
2335 disabled -- will stand out because of this change; TBB users should
2336 not be affected. Implements the client side of proposal 198.
2337 - Implement a new handshake protocol (v3) for authenticating Tors to
2338 each other over TLS. It should be more resistant to fingerprinting
2339 than previous protocols, and should require less TLS hacking for
2340 future Tor implementations. Implements proposal 176.
2341 - Allow variable-length padding cells, to disguise the length of
2342 Tor's TLS records. Implements part of proposal 184.
2343 - While we're trying to bootstrap, record how many TLS connections
2344 fail in each state, and report which states saw the most failures
2345 in response to any bootstrap failures. This feature may speed up
2346 diagnosis of censorship events. Implements ticket 3116.
2348 o Major features (pluggable transports):
2349 - Clients and bridges can now be configured to use a separate
2350 "transport" proxy. This approach makes the censorship arms race
2351 easier by allowing bridges to use protocol obfuscation plugins.
2352 Implements proposal 180 (tickets 2841 and 3472).
2354 o Major features (DoS resistance):
2355 - Now that Tor 0.2.0.x is completely deprecated, enable the final
2356 part of "Proposal 110: Avoiding infinite length circuits" by
2357 refusing all circuit-extend requests that do not use a relay_early
2358 cell. This change helps Tor resist a class of denial-of-service
2359 attacks by limiting the maximum circuit length.
2360 - Tear down the circuit if we get an unexpected SENDME cell. Clients
2361 could use this trick to make their circuits receive cells faster
2362 than our flow control would have allowed, or to gum up the network,
2363 or possibly to do targeted memory denial-of-service attacks on
2364 entry nodes. Fixes bug 6252. Bugfix on the 54th commit on Tor --
2365 from July 2002, before the release of Tor 0.0.0.
2367 o Major features (hidden services):
2368 - Adjust the number of introduction points that a hidden service
2369 will try to maintain based on how long its introduction points
2370 remain in use and how many introductions they handle. Fixes
2372 - Add a "tor2web mode" for clients that want to connect to hidden
2373 services non-anonymously (and possibly more quickly). As a safety
2374 measure to try to keep users from turning this on without knowing
2375 what they are doing, tor2web mode must be explicitly enabled at
2376 compile time, and a copy of Tor compiled to run in tor2web mode
2377 cannot be used as a normal Tor client. Implements feature 2553.
2379 o Major features (IPv6):
2380 - Clients can now connect to private bridges over IPv6. Bridges
2381 still need at least one IPv4 address in order to connect to
2382 other relays. Note that we don't yet handle the case where the
2383 user has two bridge lines for the same bridge (one IPv4, one
2384 IPv6). Implements parts of proposal 186.
2386 o Major features (directory authorities):
2387 - Use a more secure consensus parameter voting algorithm. Now at
2388 least three directory authorities or a majority of them must
2389 vote on a given parameter before it will be included in the
2390 consensus. Implements proposal 178.
2391 - Remove the artificially low cutoff of 20KB to guarantee the Fast
2392 flag. In the past few years the average relay speed has picked
2393 up, and while the "top 7/8 of the network get the Fast flag" and
2394 "all relays with 20KB or more of capacity get the Fast flag" rules
2395 used to have the same result, now the top 7/8 of the network has
2396 a capacity more like 32KB. Bugfix on 0.2.1.14-rc. Fixes bug 4489.
2398 o Major features (performance):
2399 - Exit nodes now accept and queue data on not-yet-connected streams.
2400 Previously, the client wasn't allowed to send data until the
2401 stream was connected, which slowed down all connections. This
2402 change will enable clients to perform a "fast-start" on streams
2403 and send data without having to wait for a confirmation that the
2404 stream has opened. Patch from Ian Goldberg; implements the server
2405 side of Proposal 174.
2406 - When using an exit relay running 0.2.3.x, clients can now
2407 "optimistically" send data before the exit relay reports that
2408 the stream has opened. This saves a round trip when starting
2409 connections where the client speaks first (such as web browsing).
2410 This behavior is controlled by a consensus parameter (currently
2411 disabled). To turn it on or off manually, use the "OptimisticData"
2412 torrc option. Implements proposal 181; code by Ian Goldberg.
2413 - Add a new TokenBucketRefillInterval option to refill token buckets
2414 more frequently than once per second. This should improve network
2415 performance, alleviate queueing problems, and make traffic less
2416 bursty. Implements proposal 183; closes ticket 3630. Design by
2417 Florian Tschorsch and Björn Scheuermann; implementation by
2419 - Raise the threshold of server descriptors needed (75%) and exit
2420 server descriptors needed (50%) before we will declare ourselves
2421 bootstrapped. This will make clients start building circuits a
2422 little later, but makes the initially constructed circuits less
2423 skewed and less in conflict with further directory fetches. Fixes
2426 o Major features (relays):
2427 - Relays now try regenerating and uploading their descriptor more
2428 frequently if they are not listed in the consensus, or if the
2429 version of their descriptor listed in the consensus is too
2430 old. This fix should prevent situations where a server declines
2431 to re-publish itself because it has done so too recently, even
2432 though the authorities decided not to list its recent-enough
2433 descriptor. Fix for bug 3327.
2435 o Major features (stream isolation):
2436 - You can now configure Tor so that streams from different
2437 applications are isolated on different circuits, to prevent an
2438 attacker who sees your streams as they leave an exit node from
2439 linking your sessions to one another. To do this, choose some way
2440 to distinguish the applications: have them connect to different
2441 SocksPorts, or have one of them use SOCKS4 while the other uses
2442 SOCKS5, or have them pass different authentication strings to the
2443 SOCKS proxy. Then, use the new SocksPort syntax to configure the
2444 degree of isolation you need. This implements Proposal 171.
2445 - There's a new syntax for specifying multiple client ports (such as
2446 SOCKSPort, TransPort, DNSPort, NATDPort): you can now just declare
2447 multiple *Port entries with full addr:port syntax on each.
2448 The old *ListenAddress format is still supported, but you can't
2449 mix it with the new *Port syntax.
2451 o Major features (bufferevents):
2452 - Tor can now optionally build with the "bufferevents" buffered IO
2453 backend provided by Libevent 2. To use this feature, make sure you
2454 have the latest possible version of Libevent, and pass the
2455 --enable-bufferevents flag to configure when building Tor from
2456 source. This feature will make our networking code more flexible,
2457 let us stack layers on each other, and let us use more efficient
2458 zero-copy transports where available.
2459 - Add experimental support for running on Windows with IOCP and no
2460 kernel-space socket buffers. This feature is controlled by a new
2461 "UserspaceIOCPBuffers" config option (off by default), which has
2462 no effect unless Tor has been built with bufferevents enabled,
2463 you're running on Windows, and you've set "DisableIOCP 0". In the
2464 long run, this may help solve or mitigate bug 98.
2466 o Major features (path selection):
2467 - The EntryNodes option can now include country codes like {de} or IP
2468 addresses or network masks. Previously we had disallowed these
2469 options because we didn't have an efficient way to keep the list up
2470 to date. Addresses ticket 1982, but see bug 2798 for an unresolved
2473 o Major features (port forwarding):
2474 - Add support for automatic port mapping on the many home routers
2475 that support NAT-PMP or UPnP. To build the support code, you'll
2476 need to have the libnatpnp library and/or the libminiupnpc library,
2477 and you'll need to enable the feature specifically by passing
2478 "--enable-upnp" and/or "--enable-natpnp" to ./configure. To turn
2479 it on, use the new PortForwarding option.
2481 o Major features (logging):
2482 - Add a new 'Heartbeat' log message type to periodically log a message
2483 describing Tor's status at level Notice. This feature is meant for
2484 operators who log at notice, and want to make sure that their Tor
2485 server is still working. Implementation by George Kadianakis.
2486 - Make logging resolution configurable with a new LogTimeGranularity
2487 option, and change the default from 1 millisecond to 1 second.
2488 Implements enhancement 1668.
2490 o Major features (other):
2491 - New "DisableNetwork" config option to prevent Tor from launching any
2492 connections or accepting any connections except on a control port.
2493 Bundles and controllers can set this option before letting Tor talk
2494 to the rest of the network, for example to prevent any connections
2495 to a non-bridge address. Packages like Orbot can also use this
2496 option to instruct Tor to save power when the network is off.
2497 - Try to use system facilities for enumerating local interface
2498 addresses, before falling back to our old approach (which was
2499 binding a UDP socket, and calling getsockname() on it). That
2500 approach was scaring OS X users whose draconian firewall
2501 software warned about binding to UDP sockets regardless of
2502 whether packets were sent. Now we try to use getifaddrs(),
2503 SIOCGIFCONF, or GetAdaptersAddresses(), depending on what the
2504 system supports. Resolves ticket 1827.
2505 - Add experimental support for a "defaults" torrc file to be parsed
2506 before the regular torrc. Torrc options override the defaults file's
2507 options in the same way that the command line overrides the torrc.
2508 The SAVECONF controller command saves only those options which
2509 differ between the current configuration and the defaults file. HUP
2510 reloads both files. Implements task 4552.
2512 o New directory authorities:
2513 - Add Faravahar (run by Sina Rabbani) as the ninth v3 directory
2514 authority. Closes ticket 5749.
2516 o Security/privacy fixes:
2517 - Avoid read-from-freed-memory and double-free bugs that could occur
2518 when a DNS request fails while launching it. Fixes bug 6480;
2519 bugfix on 0.2.0.1-alpha.
2520 - Reject any attempt to extend to an internal address. Without
2521 this fix, a router could be used to probe addresses on an internal
2522 network to see whether they were accepting connections. Fixes bug
2523 6710; bugfix on 0.0.8pre1.
2524 - Close any connection that sends unrecognized junk before the TLS
2525 handshake. Solves an issue noted in bug 4369.
2526 - The advertised platform of a relay now includes only its operating
2527 system's name (e.g., "Linux", "Darwin", "Windows 7"), and not
2528 its service pack level (for Windows) or its CPU architecture
2529 (for Unix). Also drop the "git-XYZ" tag in the version. Packagers
2530 can insert an extra string in the platform line by setting the
2531 preprocessor variable TOR_BUILD_TAG. Resolves bug 2988.
2532 - Disable TLS session tickets. OpenSSL's implementation was giving
2533 our TLS session keys the lifetime of our TLS context objects, when
2534 perfect forward secrecy would want us to discard anything that
2535 could decrypt a link connection as soon as the link connection
2536 was closed. Fixes bug 7139; bugfix on all versions of Tor linked
2537 against OpenSSL 1.0.0 or later. Found by Florent Daignière.
2538 - Tor tries to wipe potentially sensitive data after using it, so
2539 that if some subsequent security failure exposes Tor's memory,
2540 the damage will be limited. But we had a bug where the compiler
2541 was eliminating these wipe operations when it decided that the
2542 memory was no longer visible to a (correctly running) program,
2543 hence defeating our attempt at defense in depth. We fix that
2544 by using OpenSSL's OPENSSL_cleanse() operation, which a compiler
2545 is unlikely to optimize away. Future versions of Tor may use
2546 a less ridiculously heavy approach for this. Fixes bug 7352.
2547 Reported in an article by Andrey Karpov.
2549 o Major bugfixes (crashes and asserts):
2550 - Avoid a pair of double-free and use-after-mark bugs that can
2551 occur with certain timings in canceled and re-received DNS
2552 requests. Fixes bug 6472; bugfix on 0.0.7rc1.
2553 - Fix a denial of service attack by which any directory authority
2554 could crash all the others, or by which a single v2 directory
2555 authority could crash everybody downloading v2 directory
2556 information. Fixes bug 7191; bugfix on 0.2.0.10-alpha.
2557 - Fix an assert that directory authorities could trigger on sighup
2558 during some configuration state transitions. We now don't treat
2559 it as a fatal error when the new descriptor we just generated in
2560 init_keys() isn't accepted. Fixes bug 4438; bugfix on 0.2.1.9-alpha.
2561 - Avoid segfault when starting up having run with an extremely old
2562 version of Tor and parsing its state file. Fixes bug 6801; bugfix
2565 o Major bugfixes (clients):
2566 - If we are unable to find any exit that supports our predicted ports,
2567 stop calling them predicted, so that we don't loop and build
2568 hopeless circuits indefinitely. Fixes bug 3296; bugfix on 0.0.9pre6,
2569 which introduced predicted ports.
2570 - Check at each new consensus whether our entry guards were picked
2571 long enough ago that we should rotate them. Previously, we only
2572 did this check at startup, which could lead to us holding a guard
2573 indefinitely. Fixes bug 5380; bugfix on 0.2.1.14-rc.
2574 - When fetching a bridge descriptor from a bridge authority,
2575 always do so anonymously, whether we have been able to open
2576 circuits or not. Partial fix for bug 1938; bugfix on 0.2.0.7-alpha.
2577 This behavior makes it *safer* to use UpdateBridgesFromAuthority,
2578 but we'll need to wait for bug 6010 before it's actually usable.
2580 o Major bugfixes (directory voting):
2581 - Check more thoroughly to prevent a rogue authority from
2582 double-voting on any consensus directory parameter. Previously,
2583 authorities would crash in this case if the total number of
2584 votes for any parameter exceeded the number of active voters,
2585 but would let it pass otherwise. Partially fixes bug 5786; bugfix
2587 - When computing weight parameters, behave more robustly in the
2588 presence of a bad bwweightscale value. Previously, the authorities
2589 would crash if they agreed on a sufficiently broken weight_scale
2590 value; now, they use a reasonable default and carry on. Fixes the
2591 rest of bug 5786; bugfix on 0.2.2.17-alpha.
2592 - If authorities are unable to get a v2 consensus document from other
2593 directory authorities, they no longer fall back to fetching
2594 them from regular directory caches. Fixes bug 5635; bugfix on
2595 0.2.2.26-beta, where routers stopped downloading v2 consensus
2598 o Major bugfixes (relays):
2599 - Fix a bug handling SENDME cells on nonexistent streams that could
2600 result in bizarre window values. Report and patch contributed
2601 pseudonymously. Fixes part of bug 6271. This bug was introduced
2602 before the first Tor release, in svn commit r152.
2603 - Don't update the AccountingSoftLimitHitAt state file entry whenever
2604 tor gets started. This prevents a wrong average bandwidth
2605 estimate, which would cause relays to always start a new accounting
2606 interval at the earliest possible moment. Fixes bug 2003; bugfix
2607 on 0.2.2.7-alpha. Reported by Bryon Eldridge, who also helped
2608 immensely in tracking this bug down.
2609 - Fix a possible crash bug when checking for deactivated circuits
2610 in connection_or_flush_from_first_active_circuit(). Fixes bug 6341;
2611 bugfix on 0.2.2.7-alpha. Bug report and fix received pseudonymously.
2612 - Set the SO_REUSEADDR socket option before we call bind() on outgoing
2613 connections. This change should allow busy exit relays to stop
2614 running out of available sockets as quickly. Fixes bug 4950;
2615 bugfix on 0.2.2.26-beta.
2617 o Major bugfixes (blocking resistance):
2618 - Bridges no longer include their address in NETINFO cells on outgoing
2619 OR connections, to allow them to blend in better with clients.
2620 Removes another avenue for enumerating bridges. Reported by
2621 "troll_un". Fixes bug 4348; bugfix on 0.2.0.10-alpha, when NETINFO
2622 cells were introduced.
2623 - Warn the user when HTTPProxy, but no other proxy type, is
2624 configured. This can cause surprising behavior: it doesn't send
2625 all of Tor's traffic over the HTTPProxy -- it sends unencrypted
2626 directory traffic only. Resolves ticket 4663.
2628 o Major bugfixes (hidden services):
2629 - Improve hidden service robustness: when an attempt to connect to
2630 a hidden service ends, be willing to refetch its hidden service
2631 descriptors from each of the HSDir relays responsible for them
2632 immediately. Previously, we would not consider refetching the
2633 service's descriptors from each HSDir for 15 minutes after the last
2634 fetch, which was inconvenient if the hidden service was not running
2635 during the first attempt. Bugfix on 0.2.0.18-alpha; fixes bug 3335.
2636 - Hidden services now ignore the timestamps on INTRODUCE2 cells.
2637 They used to check that the timestamp was within 30 minutes
2638 of their system clock, so they could cap the size of their
2639 replay-detection cache, but that approach unnecessarily refused
2640 service to clients with wrong clocks. Bugfix on 0.2.1.6-alpha, when
2641 the v3 intro-point protocol (the first one which sent a timestamp
2642 field in the INTRODUCE2 cell) was introduced; fixes bug 3460.
2643 - When one of a hidden service's introduction points appears to be
2644 unreachable, stop trying it. Previously, we would keep trying
2645 to build circuits to the introduction point until we lost the
2646 descriptor, usually because the user gave up and restarted Tor.
2647 Fixes part of bug 3825.
2649 o Changes to default torrc file:
2650 - Stop listing "socksport 9050" in torrc.sample. We open a socks
2651 port on 9050 by default anyway, so this should not change anything
2653 - Stop mentioning the deprecated *ListenAddress options in
2654 torrc.sample. Fixes bug 5438.
2655 - Document unit of bandwidth-related options in sample torrc.
2657 - Fix broken URLs in the sample torrc file, and tell readers about
2658 the OutboundBindAddress, ExitPolicyRejectPrivate, and
2659 PublishServerDescriptor options. Addresses bug 4652.
2661 o Minor features (directory authorities):
2662 - Consider new, removed or changed IPv6 OR ports a non-cosmetic
2663 change when the authority is deciding whether to accept a newly
2664 uploaded descriptor. Implements ticket 6423.
2665 - Directory authorities are now a little more lenient at accepting
2666 older router descriptors, or newer router descriptors that don't
2667 make big changes. This should help ameliorate past and future
2668 issues where routers think they have uploaded valid descriptors,
2669 but the authorities don't think so. Fix for ticket 2479.
2670 - Authority operators can now vote for all relays in a given
2671 set of countries to be BadDir/BadExit/Invalid/Rejected.
2672 - Provide two consensus parameters (FastFlagMinThreshold and
2673 FastFlagMaxThreshold) to control the range of allowable bandwidths
2674 for the Fast directory flag. These allow authorities to run
2675 experiments on appropriate requirements for being a "Fast" node.
2676 The AuthDirFastGuarantee config value still applies. Implements
2679 o Minor features (bridges / bridge authorities):
2680 - Make bridge SSL certificates a bit more stealthy by using random
2681 serial numbers, in the same fashion as OpenSSL when generating
2682 self-signed certificates. Implements ticket 4584.
2683 - Tag a bridge's descriptor as "never to be sent unencrypted".
2684 This shouldn't matter, since bridges don't open non-anonymous
2685 connections to the bridge authority and don't allow unencrypted
2686 directory connections from clients, but we might as well make
2687 sure. Closes bug 5139.
2688 - The Bridge Authority now writes statistics on how many bridge
2689 descriptors it gave out in total, and how many unique descriptors
2690 it gave out. It also lists how often the most and least commonly
2691 fetched descriptors were given out, as well as the median and
2692 25th/75th percentile. Implements tickets 4200 and 4294.
2694 o Minor features (IPv6):
2695 - Make the code that clients use to detect an address change be
2696 IPv6-aware, so that it won't fill clients' logs with error
2697 messages when trying to get the IPv4 address of an IPv6
2698 connection. Implements ticket 5537.
2699 - Relays now understand an IPv6 address when they get one from a
2700 directory server. Resolves ticket 4875.
2702 o Minor features (hidden services):
2703 - Expire old or over-used hidden service introduction points.
2704 Required by fix for bug 3460.
2705 - Reduce the lifetime of elements of hidden services' Diffie-Hellman
2706 public key replay-detection cache from 60 minutes to 5 minutes. This
2707 replay-detection cache is now used only to detect multiple
2708 INTRODUCE2 cells specifying the same rendezvous point, so we can
2709 avoid launching multiple simultaneous attempts to connect to it.
2710 - When a hidden service's introduction point times out, consider
2711 trying it again during the next attempt to connect to the
2712 HS. Previously, we would not try it again unless a newly fetched
2713 descriptor contained it. Required by fixes for bugs 1297 and 3825.
2715 o Minor features (relays):
2716 - Relays now include a reason for regenerating their descriptors
2717 in an HTTP header when uploading to the authorities. This will
2718 make it easier to debug descriptor-upload issues in the future.
2719 - Turn on directory request statistics by default and include them in
2720 extra-info descriptors. Don't break if we have no GeoIP database.
2721 - Replace files in stats/ rather than appending to them. Now that we
2722 include statistics in extra-info descriptors, it makes no sense to
2723 keep old statistics forever. Implements ticket 2930.
2724 - Relays that set "ConnDirectionStatistics 1" write statistics on the
2725 bidirectional use of connections to disk every 24 hours.
2726 - Add a GeoIP file digest to the extra-info descriptor. Implements
2729 o Minor features (new config options):
2730 - New config option "DynamicDHGroups" (disabled by default) provides
2731 each bridge with a unique prime DH modulus to be used during
2732 SSL handshakes. This option attempts to help against censors
2733 who might use the Apache DH modulus as a static identifier for
2734 bridges. Addresses ticket 4548.
2735 - New config option "DisableDebuggerAttachment" (on by default)
2736 to prevent basic debugging attachment attempts by other processes.
2737 Supports Mac OS X and Gnu/Linux. Resolves ticket 3313.
2738 - Ordinarily, Tor does not count traffic from private addresses (like
2739 127.0.0.1 or 10.0.0.1) when calculating rate limits or accounting.
2740 There is now a new option, CountPrivateBandwidth, to disable this
2741 behavior. Patch from Daniel Cagara.
2743 o Minor features (different behavior for old config options):
2744 - Allow MapAddress directives to specify matches against super-domains,
2745 as in "MapAddress *.torproject.org *.torproject.org.torserver.exit".
2746 Implements issue 933.
2747 - Don't disable the DirPort when we cannot exceed our AccountingMax
2748 limit during this interval because the effective bandwidthrate is
2749 low enough. This is useful in a situation where AccountMax is only
2750 used as an additional safeguard or to provide statistics.
2751 - Add port 6523 (Gobby) to LongLivedPorts. Patch by intrigeri;
2752 implements ticket 3439.
2753 - When configuring a large set of nodes in EntryNodes, and there are
2754 enough of them listed as Guard so that we don't need to consider
2755 the non-guard entries, prefer the ones listed with the Guard flag.
2756 - If you set the NumCPUs option to 0, Tor will now try to detect how
2757 many CPUs you have. This is the new default behavior.
2758 - The NodeFamily option -- which let you declare that you want to
2759 consider nodes to be part of a family whether they list themselves
2760 that way or not -- now allows IP address ranges and country codes.
2762 o Minor features (new command-line config behavior):
2763 - Slightly change behavior of "list" options (that is, config
2764 options that can appear more than once) when they appear both in
2765 torrc and on the command line. Previously, the command-line options
2766 would be appended to the ones from torrc. Now, the command-line
2767 options override the torrc options entirely. This new behavior
2768 allows the user to override list options (like exit policies and
2769 ports to listen on) from the command line, rather than simply
2770 appending to the list.
2771 - You can get the old (appending) command-line behavior for "list"
2772 options by prefixing the option name with a "+".
2773 - You can remove all the values for a "list" option from the command
2774 line without adding any new ones by prefixing the option name
2777 o Minor features (controller, new events):
2778 - Extend the control protocol to report flags that control a circuit's
2779 path selection in CIRC events and in replies to 'GETINFO
2780 circuit-status'. Implements part of ticket 2411.
2781 - Extend the control protocol to report the hidden service address
2782 and current state of a hidden-service-related circuit in CIRC
2783 events and in replies to 'GETINFO circuit-status'. Implements part
2785 - Include the creation time of a circuit in CIRC and CIRC2
2786 control-port events and the list produced by the 'GETINFO
2787 circuit-status' control-port command.
2788 - Add a new CONF_CHANGED event so that controllers can be notified
2789 of any configuration changes made by other controllers, or by the
2790 user. Implements ticket 1692.
2791 - Add a new SIGNAL event to the controller interface so that
2792 controllers can be notified when Tor handles a signal. Resolves
2793 issue 1955. Patch by John Brooks.
2795 o Minor features (controller, new getinfo options):
2796 - Expose our view of whether we have gone dormant to the controller,
2797 via a new "GETINFO dormant" value. Torbutton and other controllers
2798 can use this to avoid doing periodic requests through Tor while
2799 it's dormant (bug 4718). Resolves ticket 5954.
2800 - Add a new GETINFO option to get total bytes read and written. Patch
2801 from pipe, revised by atagar. Resolves ticket 2345.
2802 - Implement new GETINFO controller fields to provide information about
2803 the Tor process's pid, euid, username, and resource limits.
2805 o Minor features (controller, other):
2806 - Allow controllers to request an event notification whenever a
2807 circuit is cannibalized or its purpose is changed. Implements
2808 part of ticket 3457.
2809 - Use absolute path names when reporting the torrc filename in the
2810 control protocol, so a controller can more easily find the torrc
2811 file. Resolves bug 1101.
2812 - When reporting the path to the cookie file to the controller,
2813 give an absolute path. Resolves ticket 4881.
2815 o Minor features (log messages):
2816 - Add more information to a log statement that might help track down
2817 bug 4091. If you're seeing "Bug: tor_addr_is_internal() called with a
2818 non-IP address" messages (or any Bug messages, for that matter!),
2819 please let us know about it.
2820 - If EntryNodes are given, but UseEntryGuards is set to 0, warn that
2821 EntryNodes will have no effect. Resolves issue 2571.
2822 - Try to make the introductory warning message that Tor prints on
2823 startup more useful for actually finding help and information.
2824 Resolves ticket 2474.
2825 - When the system call to create a listener socket fails, log the
2826 error message explaining why. This may help diagnose bug 4027.
2828 o Minor features (other):
2829 - When we fail to initialize Libevent, retry with IOCP disabled so we
2830 don't need to turn on multi-threading support in Libevent, which in
2831 turn requires a working socketpair(). This is a workaround for bug
2832 4457, which affects Libevent versions from 2.0.1-alpha through
2834 - When starting as root and then changing our UID via the User
2835 control option, and we have a ControlSocket configured, make sure
2836 that the ControlSocket is owned by the same account that Tor will
2837 run under. Implements ticket 3421; fix by Jérémy Bobbio.
2838 - Accept attempts to include a password authenticator in the
2839 handshake, as supported by SOCKS5. This handles SOCKS clients that
2840 don't know how to omit a password when authenticating. Resolves
2842 - Check for and recover from inconsistency in the microdescriptor
2843 cache. This will make it harder for us to accidentally free a
2844 microdescriptor without removing it from the appropriate data
2845 structures. Fixes issue 3135; issue noted by "wanoskarnet".
2846 - Shorten links in the tor-exit-notice file. Patch by Christian Kujau.
2848 o Minor bugfixes (code security):
2849 - Prevent a null-pointer dereference when receiving a data cell
2850 for a nonexistent stream when the circuit in question has an
2851 empty deliver window. We don't believe this is triggerable,
2852 since we don't currently allow deliver windows to become empty,
2853 but the logic is tricky enough that it's better to make the code
2854 robust. Fixes bug 5541; bugfix on 0.0.2pre14.
2855 - Fix a (harmless) integer overflow in cell statistics reported by
2856 some fast relays. Fixes bug 5849; bugfix on 0.2.2.1-alpha.
2857 - Fix our implementation of crypto_random_hostname() so it can't
2858 overflow on ridiculously large inputs. (No Tor version has ever
2859 provided this kind of bad inputs, but let's be correct in depth.)
2860 Fixes bug 4413; bugfix on 0.2.2.9-alpha. Fix by Stephen Palmateer.
2861 - Add a (probably redundant) memory clear between iterations of
2862 the router status voting loop, to prevent future coding errors
2863 where data might leak between iterations of the loop. Resolves
2866 o Minor bugfixes (wrapper functions):
2867 - Abort if tor_vasprintf() fails in connection_printf_to_buf() (a
2868 utility function used in the control-port code). This shouldn't
2869 ever happen unless Tor is completely out of memory, but if it did
2870 happen and Tor somehow recovered from it, Tor could have sent a log
2871 message to a control port in the middle of a reply to a controller
2872 command. Fixes part of bug 3428; bugfix on 0.1.2.3-alpha.
2873 - Fix some (not actually triggerable) buffer size checks in usage of
2874 tor_inet_ntop(). Fixes bug 4434; bugfix on Tor 0.2.0.1-alpha. Patch
2876 - Fix parsing of some corner-cases with tor_inet_pton(). Fixes
2877 bug 4515; bugfix on 0.2.0.1-alpha; fix by Anders Sundman.
2878 - Enforce correct return behavior of tor_vsscanf() when the '%%'
2879 pattern is used. Fixes bug 5558. Bugfix on 0.2.1.13.
2880 - Make our replacement implementation of strtok_r() compatible with
2881 the standard behavior of strtok_r(). Patch by nils. Fixes bug 5091;
2882 bugfix on 0.2.2.1-alpha.
2883 - Find more places in the code that should have been testing for
2884 invalid sockets using the SOCKET_OK macro. Required for a fix
2885 for bug 4533. Bugfix on 0.2.2.28-beta.
2887 o Minor bugfixes (code correctness):
2888 - Check return value of fputs() when writing authority certificate
2889 file. Fixes Coverity issue 709056; bugfix on 0.2.0.1-alpha.
2890 - When building Tor on Windows with -DUNICODE (not default), ensure
2891 that error messages, filenames, and DNS server names are always
2892 NUL-terminated when we convert them to a single-byte encoding.
2893 Fixes bug 5909; bugfix on 0.2.2.16-alpha.
2894 - Fix a memory leak when trying to launch a DNS request when the
2895 nameservers are unconfigurable. Fixes bug 5916; bugfix on Tor
2897 - Correct file sizes when reading binary files on Cygwin, to avoid
2898 a bug where Tor would fail to read its state file. Fixes bug 6844;
2899 bugfix on 0.1.2.7-alpha.
2900 - Make sure to set *socket_error in all error cases in
2901 connection_connect(), so it can't produce a warning about
2902 errno being zero from errno_to_orconn_end_reason(). Bugfix on
2903 0.2.1.1-alpha; resolves ticket 6028.
2904 - Initialize conn->addr to a valid state in spawn_cpuworker(). Fixes
2905 bug 4532; found by "troll_un".
2907 o Minor bugfixes (clients):
2908 - Allow one-hop directory-fetching circuits the full "circuit build
2909 timeout" period, rather than just half of it, before failing them
2910 and marking the relay down. This fix should help reduce cases where
2911 clients declare relays (or worse, bridges) unreachable because
2912 the TLS handshake takes a few seconds to complete. Fixes bug 6743;
2913 bugfix on 0.2.2.2-alpha, where we changed the timeout from a static
2915 - Ensure we don't cannibalize circuits that are longer than three hops
2916 already, so we don't end up making circuits with 5 or more
2917 hops. Patch contributed by wanoskarnet. Fixes bug 5231; bugfix on
2918 0.1.0.1-rc which introduced cannibalization.
2920 o Minor bugfixes (relays):
2921 - Don't publish a new relay descriptor when we reload our onion key,
2922 unless the onion key has actually changed. Fixes bug 3263 and
2923 resolves another cause of bug 1810. Bugfix on 0.1.1.11-alpha.
2924 - When relays refuse a "create" cell because their queue of pending
2925 create cells is too big (typically because their cpu can't keep up
2926 with the arrival rate), send back reason "resource limit" rather
2927 than reason "internal", so network measurement scripts can get a
2928 more accurate picture. Bugfix on 0.1.1.11-alpha; fixes bug 7037.
2929 - Exit nodes don't need to fetch certificates for authorities that
2930 they don't recognize; only directory authorities, bridges,
2931 and caches need to do that. Fixes part of bug 2297; bugfix on
2934 o Minor bugfixes (directory authority / mirrors):
2935 - Avoid O(n^2) performance characteristics when parsing a large
2936 extrainfo cache. Fixes bug 5828; bugfix on 0.2.0.1-alpha.
2937 - Authorities no longer include any router in their microdescriptor
2938 consensuses for which they couldn't generate or agree on a
2939 microdescriptor. Fixes the second piece of bug 6404; fix on
2941 - When checking for requested signatures on the latest consensus
2942 before serving it to a client, make sure to check the right
2943 consensus flavor. Bugfix on 0.2.2.6-alpha.
2944 - Fix an edge case where TestingTorNetwork is set but the authorities
2945 and relays all have an uptime of zero, so the private Tor network
2946 could briefly lack support for hidden services. Fixes bug 3886;
2947 bugfix on 0.2.2.18-alpha.
2948 - Directory caches no longer refuse to clean out descriptors because
2949 of missing v2 networkstatus documents, unless they're configured
2950 to retrieve v2 networkstatus documents. Fixes bug 4838; bugfix on
2951 0.2.2.26-beta. Patch by Daniel Bryg.
2952 - Don't serve or accept v2 hidden service descriptors over a relay's
2953 DirPort. It's never correct to do so, and disabling it might
2954 make it more annoying to exploit any bugs that turn up in the
2955 descriptor-parsing code. Fixes bug 7149.
2957 o Minor bugfixes (hidden services, client-side):
2958 - Assert that hidden-service-related operations are not performed
2959 using single-hop circuits. Previously, Tor would assert that
2960 client-side streams are not attached to single-hop circuits,
2961 but not that other sensitive operations on the client and service
2962 side are not performed using single-hop circuits. Fixes bug 3332;
2964 - Avoid undefined behaviour when parsing the list of supported
2965 rendezvous/introduction protocols in a hidden service descriptor.
2966 Previously, Tor would have confused (as-yet-unused) protocol version
2967 numbers greater than 32 with lower ones on many platforms. Fixes
2968 bug 6827; bugfix on 0.2.0.10-alpha. Found by George Kadianakis.
2969 - Don't close hidden service client circuits which have almost
2970 finished connecting to their destination when they reach
2971 the normal circuit-build timeout. Previously, we would close
2972 introduction circuits which are waiting for an acknowledgement
2973 from the introduction point, and rendezvous circuits which have
2974 been specified in an INTRODUCE1 cell sent to a hidden service,
2975 after the normal CBT. Now, we mark them as 'timed out', and launch
2976 another rendezvous attempt in parallel. This behavior change can
2977 be disabled using the new CloseHSClientCircuitsImmediatelyOnTimeout
2978 option. Fixes part of bug 1297; bugfix on 0.2.2.2-alpha.
2980 o Minor bugfixes (hidden services, service-side):
2981 - Don't close hidden-service-side rendezvous circuits when they
2982 reach the normal circuit-build timeout. This behaviour change can
2983 be disabled using the new
2984 CloseHSServiceRendCircuitsImmediatelyOnTimeout option. Fixes the
2985 remaining part of bug 1297; bugfix on 0.2.2.2-alpha.
2986 - Don't launch more than 10 service-side introduction-point circuits
2987 for a hidden service in five minutes. Previously, we would consider
2988 launching more introduction-point circuits if at least one second
2989 had passed without any introduction-point circuits failing. Fixes
2990 bug 4607; bugfix on 0.0.7pre1.
2992 o Minor bugfixes (config option behavior):
2993 - If the user tries to set MyFamily on a bridge, refuse to
2994 do so, and warn about the security implications. Fixes bug 4657;
2995 bugfix on 0.2.0.3-alpha.
2996 - The "--quiet" and "--hush" options now apply not only to Tor's
2997 behavior before logs are configured, but also to Tor's behavior in
2998 the absense of configured logs. Fixes bug 3550; bugfix on
3000 - Change the AllowDotExit rules so they should actually work.
3001 We now enforce AllowDotExit only immediately after receiving an
3002 address via SOCKS or DNSPort: other sources are free to provide
3003 .exit addresses after the resolution occurs. Fixes bug 3940;
3004 bugfix on 0.2.2.1-alpha.
3005 - Make "LearnCircuitBuildTimeout 0" work more reliably. Specifically,
3006 don't depend on the consensus parameters or compute adaptive
3007 timeouts when it is disabled. Fixes bug 5049; bugfix on
3009 - After we pick a directory mirror, we would refuse to use it if
3010 it's in our ExcludeExitNodes list, resulting in mysterious failures
3011 to bootstrap for people who just wanted to avoid exiting from
3012 certain locations. Fixes bug 5623; bugfix on 0.2.2.25-alpha.
3013 - When told to add a bridge with the same digest as a preexisting
3014 bridge but a different addr:port, change the addr:port as
3015 requested. Previously we would not notice the change. Fixes half
3016 of bug 5603; fix on 0.2.2.26-beta.
3018 o Minor bugfixes (controller):
3019 - Allow manual 'authenticate' commands to the controller interface
3020 from netcat (nc) as well as telnet. We were rejecting them because
3021 they didn't come with the expected whitespace at the end of the
3022 command. Bugfix on 0.1.1.1-alpha; fixes bug 2893.
3023 - Report a real bootstrap problem to the controller on router
3024 identity mismatch. Previously we just said "foo", which probably
3025 made a lot of sense at the time. Fixes bug 4169; bugfix on
3027 - When we receive a SIGHUP and the controller __ReloadTorrcOnSIGHUP
3028 option is set to 0 (which Vidalia version 0.2.16 now does when
3029 a SAVECONF attempt fails), perform other actions that SIGHUP
3030 usually causes (like reopening the logs). Fixes bug 5095; bugfix
3032 - Correctly handle checking the permissions on the parent
3033 directory of a control socket in the root directory. Bug found
3034 by Esteban Manchado Velázquez. Fixes bug 5089; bugfix on Tor
3036 - End AUTHCHALLENGE error messages (in the control protocol) with
3037 a CRLF. Fixes bug 5760; bugfix on 0.2.2.36.
3039 o Minor bugfixes (network reading/writing):
3040 - Disable writing on marked-for-close connections when they are
3041 blocked on bandwidth, to prevent busy-looping in Libevent. Fixes
3042 bug 5263; bugfix on 0.0.2pre13, where we first added a special
3043 case for flushing marked connections.
3044 - Make sure that there are no unhandled pending TLS errors before
3045 reading from a TLS stream. We had checks in 0.1.0.3-rc, but
3046 lost them in 0.1.0.5-rc when we refactored read_to_buf_tls().
3047 Bugfix on 0.1.0.5-rc; fixes bug 4528.
3048 - Detect SSL handshake even when the initial attempt to write the
3049 server hello fails. Fixes bug 4592; bugfix on 0.2.0.13-alpha.
3050 - If the client fails to set a reasonable set of ciphersuites
3051 during its v2 handshake renegotiation, allow the renegotiation to
3052 continue nevertheless (i.e. send all the required certificates).
3053 Fixes bug 4591; bugfix on 0.2.0.20-rc.
3055 o Minor bugfixes (other):
3056 - Exit nodes now correctly report EADDRINUSE and EADDRNOTAVAIL as
3057 resource exhaustion, so that clients can adjust their load to
3058 try other exits. Fixes bug 4710; bugfix on 0.1.0.1-rc, which
3059 started using END_STREAM_REASON_RESOURCELIMIT.
3060 - Don't check for whether the address we're using for outbound
3061 connections has changed until after the outbound connection has
3062 completed. On Windows, getsockname() doesn't succeed until the
3063 connection is finished. Fixes bug 5374; bugfix on 0.1.1.14-alpha.
3064 - Don't hold a Windows file handle open for every file mapping;
3065 the file mapping handle is sufficient. Fixes bug 5951; bugfix on
3067 - Fix wrong TCP port range in parse_port_range(). Fixes bug 6218;
3068 bugfix on 0.2.1.10-alpha.
3069 - If we fail to write a microdescriptor to the disk cache, do not
3070 continue replacing the old microdescriptor file. Fixes bug 2954;
3071 bugfix on 0.2.2.6-alpha.
3073 o Minor bugfixes (log messages, path selection):
3074 - Downgrade "set buildtimeout to low value" messages to "info"
3075 severity; they were never an actual problem, there was never
3076 anything reasonable to do about them, and they tended to spam logs
3077 from time to time. Fixes bug 6251; bugfix on 0.2.2.2-alpha.
3078 - Rate-limit the "Weighted bandwidth is 0.000000" message, and add
3079 more information to it, so that we can track it down in case it
3080 returns again. Mitigates bug 5235.
3081 - Check CircuitBuildTimeout and LearnCircuitBuildTimeout in
3082 options_validate(); warn if LearnCircuitBuildTimeout is disabled and
3083 CircuitBuildTimeout is set unreasonably low. Resolves ticket 5452.
3084 - Issue a log message if a guard completes less than 40% of your
3085 circuits. Threshold is configurable by torrc option
3086 PathBiasNoticeRate and consensus parameter pb_noticepct. There is
3087 additional, off-by-default code to disable guards which fail too
3088 many circuits. Addresses ticket 5458.
3090 o Minor bugfixes (log messages, client):
3091 - Downgrade "Got a certificate, but we already have it" log messages
3092 from warning to info, except when we're a dirauth. Fixes bug 5238;
3093 bugfix on 0.2.1.7-alpha.
3094 - Fix the log message describing how we work around discovering
3095 that our version is the ill-fated OpenSSL 0.9.8l. Fixes bug
3096 4837; bugfix on 0.2.2.9-alpha.
3097 - When logging about a disallowed .exit name, do not also call it
3098 an "invalid onion address". Fixes bug 3325; bugfix on 0.2.2.9-alpha.
3099 - Fix a log message suggesting that people contact a non-existent
3100 email address. Fixes bug 3448.
3101 - Rephrase the log message emitted if the TestSocks check is
3102 successful. Patch from Fabian Keil; fixes bug 4094.
3103 - Log (at debug level) whenever a circuit's purpose is changed.
3104 - Log SSL state transitions at log level DEBUG, log domain
3105 HANDSHAKE. This can be useful for debugging censorship events.
3106 Implements ticket 3264.
3107 - We now log which torrc file we're using on startup. Implements
3109 - Rate-limit log messages when asked to connect anonymously to
3110 a private address. When these hit, they tended to hit fast and
3111 often. Also, don't bother trying to connect to addresses that we
3112 are sure will resolve to 127.0.0.1: getting 127.0.0.1 in a directory
3113 reply makes us think we have been lied to, even when the address the
3114 client tried to connect to was "localhost." Resolves ticket 2822.
3116 o Minor bugfixes (log messages, non-client):
3117 - Downgrade "eventdns rejected address" message to LOG_PROTOCOL_WARN.
3118 Fixes bug 5932; bugfix on 0.2.2.7-alpha.
3119 - Don't log that we have "decided to publish new relay descriptor"
3120 unless we are actually publishing a descriptor. Fixes bug 3942;
3121 bugfix on 0.2.2.28-beta.
3122 - Log which authority we're missing votes from when we go to fetch
3123 them from the other auths.
3124 - Replace "Sending publish request" log messages with "Launching
3125 upload", so that they no longer confusingly imply that we're
3126 sending something to a directory we might not even be connected
3127 to yet. Fixes bug 3311; bugfix on 0.2.0.10-alpha.
3128 - Warn when Tor is configured to use accounting in a way that can
3129 link a hidden service to some other hidden service or public
3130 address. Resolves ticket 6490.
3131 - Fix a minor formatting issue in one of tor-gencert's error messages.
3135 - Update to the latest version of the tinytest unit testing framework.
3136 This includes a couple of bugfixes that can be relevant for
3137 running forked unit tests on Windows, and removes all reserved
3139 - Avoid a false positive in the util/threads unit test by increasing
3140 the maximum timeout time. Fixes bug 6227; bugfix on 0.2.0.4-alpha.
3141 - Make it possible to set the TestingTorNetwork configuration
3142 option using AlternateDirAuthority and AlternateBridgeAuthority
3143 as an alternative to setting DirServer. Addresses ticket 6377.
3144 - Add a unit test for the environment_variable_names_equal() function.
3145 - A wide variety of new unit tests by Esteban Manchado Velázquez.
3146 - Numerous new unit tests for functions in util.c and address.c by
3148 - The long-disabled benchmark tests are now split into their own
3149 ./src/test/bench binary.
3150 - The benchmark tests can now use more accurate timers than
3151 gettimeofday() when such timers are available.
3152 - Use tt_assert(), not tor_assert(), for checking for test failures.
3153 This makes the unit tests more able to go on in the event that
3156 o Build improvements:
3157 - Use the dead_strip option when building Tor on OS X. This reduces
3158 binary size by almost 19% when linking openssl and libevent
3159 statically, which we do for Tor Browser Bundle.
3160 - Provide a better error message about possible OSX Asciidoc failure
3161 reasons. Fixes bug 6436.
3162 - Detect attempts to build Tor on (as yet hypothetical) versions
3163 of Windows where sizeof(intptr_t) != sizeof(SOCKET). Partial
3164 fix for bug 4533. Bugfix on 0.2.2.28-beta.
3165 - On Windows, we now define the _WIN32_WINNT macros only if they
3166 are not already defined. This lets the person building Tor decide,
3167 if they want, to require a later version of Windows.
3168 - Our autogen.sh script now uses autoreconf to launch autoconf,
3169 automake, and so on. This is more robust against some of the failure
3170 modes associated with running the autotools pieces on their own.
3171 - Running "make version" now displays the version of Tor that
3172 we're about to build. Idea from katmagic; resolves issue 4400.
3173 - Make 'tor --digests' list hashes of all Tor source files. Bugfix
3174 on 0.2.2.4-alpha; fixes bug 3427.
3175 - New --enable-static-tor configure option for building Tor as
3176 statically as possible. Idea, general hackery and thoughts from
3177 Alexei Czeskis, John Gilmore, Jacob Appelbaum. Implements ticket
3179 - Limited, experimental support for building with nmake and MSVC.
3181 o Build requirements:
3182 - Building Tor with bufferevent support now requires Libevent
3183 2.0.13-stable or later. Previous versions of Libevent had bugs in
3184 SSL-related bufferevents and related issues that would make Tor
3185 work badly with bufferevents. Requiring 2.0.13-stable also allows
3186 Tor with bufferevents to take advantage of Libevent APIs
3187 introduced after 2.0.8-rc.
3188 - Our build system requires automake 1.6 or later to create the
3189 Makefile.in files. Previously, you could have used 1.4.
3190 This only affects developers and people building Tor from git;
3191 people who build Tor from the source distribution without changing
3192 the Makefile.am files should be fine.
3193 - Detect when we try to build on a platform that doesn't define
3194 AF_UNSPEC to 0. We don't work there, so refuse to compile.
3196 o Build fixes (compile/link):
3197 - Format more doubles with %f, not %lf. Patch from grarpamp to make
3198 Tor build correctly on older BSDs again. Fixes bug 3894; bugfix on
3200 - When building with --enable-static-tor on OpenBSD, do not
3201 erroneously attempt to link -lrt. Fixes bug 5103.
3202 - Set _WIN32_WINNT to 0x0501 consistently throughout the code, so
3203 that IPv6 stuff will compile on MSVC, and compilation issues
3204 will be easier to track down. Fixes bug 5861.
3205 - Fix build and 64-bit compile warnings from --enable-openbsd-malloc.
3206 Fixes bug 6379. Bugfix on 0.2.0.20-rc.
3207 - Make Tor build correctly again with -DUNICODE -D_UNICODE defined.
3208 Fixes bug 6097; bugfix on 0.2.2.16-alpha.
3210 o Build fixes (other):
3211 - Use the _WIN32 macro throughout our code to detect Windows.
3212 (Previously we had used the obsolete 'WIN32' and the idiosyncratic
3214 - Properly handle the case where the build-tree is not the same
3215 as the source tree when generating src/common/common_sha1.i,
3216 src/or/micro-revision.i, and src/or/or_sha1.i. Fixes bug 3953;
3217 bugfix on 0.2.0.1-alpha.
3218 - During configure, search for library containing cos function as
3219 libm lives in libcore on some platforms (BeOS/Haiku). Linking
3220 against libm was hard-coded before. Fixes the first part of bug
3221 4727; bugfix on 0.2.2.2-alpha. Patch and analysis by Martin Hebnes
3223 - Prevent a false positive from the check-spaces script, by disabling
3224 the "whitespace between function name and (" check for functions
3227 o Packaging (RPM) changes:
3228 - Update our default RPM spec files to work with mock and rpmbuild
3229 on RHEL/Fedora. They have an updated set of dependencies and
3230 conflicts, a fix for an ancient typo when creating the "_tor"
3231 user, and better instructions. Thanks to Ondrej Mikle for the
3232 patch series. Fixes bug 6043.
3233 - On OpenSUSE, create the /var/run/tor directory on startup if it
3234 is not already created. Patch from Andreas Stieger. Fixes bug 2573.
3236 o Code refactoring (safety):
3237 - Do not use SMARTLIST_FOREACH for any loop whose body exceeds
3238 10 lines. Also, don't nest them. Doing so in the past has
3239 led to hard-to-debug code. The new style is to use the
3240 SMARTLIST_FOREACH_{BEGIN,END} pair. Addresses issue 6400.
3241 - Use macros to indicate OpenSSL versions, so we don't need to worry
3242 about accidental hexadecimal bit shifts.
3243 - Use tor_sscanf() in place of scanf() in more places through the
3244 code. This makes us a little more locale-independent, and
3245 should help shut up code-analysis tools that can't tell
3246 a safe sscanf string from a dangerous one.
3247 - Convert more instances of tor_snprintf+tor_strdup into tor_asprintf.
3248 - Use the smartlist_add_asprintf() alias more consistently.
3250 o Code refactoring (consolidate):
3251 - A major revision to our internal node-selecting and listing logic.
3252 Tor already had at least two major ways to look at the question of
3253 "which Tor servers do we know about": a list of router descriptors,
3254 and a list of entries in the current consensus. With
3255 microdescriptors, we're adding a third. Having so many systems
3256 without an abstraction layer over them was hurting the codebase.
3257 Now, we have a new "node_t" abstraction that presents a consistent
3258 interface to a client's view of a Tor node, and holds (nearly) all
3259 of the mutable state formerly in routerinfo_t and routerstatus_t.
3260 - Move tor_gettimeofday_cached() into compat_libevent.c, and use
3261 Libevent's notion of cached time when possible.
3262 - Remove duplicate code for invoking getrlimit() from control.c.
3263 - Use OpenSSL's built-in SSL_state_string_long() instead of our
3264 own homebrewed ssl_state_to_string() replacement. Patch from
3265 Emile Snyder. Fixes bug 4653.
3266 - Change the symmetric cipher interface so that creating and
3267 initializing a stream cipher are no longer separate functions.
3269 o Code refactoring (separate):
3270 - Make a new "entry connection" struct as an internal subtype of "edge
3271 connection", to simplify the code and make exit connections smaller.
3272 - Split connection_about_to_close() into separate functions for each
3274 - Rewrite the listener-selection logic so that parsing which ports
3275 we want to listen on is now separate from binding to the ports
3278 o Code refactoring (name changes):
3279 - Rename a handful of old identifiers, mostly related to crypto
3280 structures and crypto functions. By convention, our "create an
3281 object" functions are called "type_new()", our "free an object"
3282 functions are called "type_free()", and our types indicate that
3283 they are types only with a final "_t". But a handful of older
3284 types and functions broke these rules, with function names like
3285 "type_create" or "subsystem_op_type", or with type names like
3287 - Rename Tor functions that turn strings into addresses, so that
3288 "parse" indicates that no hostname resolution occurs, and
3289 "lookup" indicates that hostname resolution may occur. This
3290 should help prevent mistakes in the future. Fixes bug 3512.
3291 - Use the name "CERTS" consistently to refer to the new cell type;
3292 we were calling it CERT in some places and CERTS in others.
3293 - Use a TOR_INVALID_SOCKET macro when initializing a socket to an
3294 invalid value, rather than just -1.
3295 - Rename the bench_{aes,dmap} functions to test_*, so that tinytest
3296 can pick them up when the tests aren't disabled. Bugfix on
3297 0.2.2.4-alpha which introduced tinytest.
3299 o Code refactoring (other):
3300 - Defensively refactor rend_mid_rendezvous() so that protocol
3301 violations and length checks happen in the beginning. Fixes
3303 - Remove the pure attribute from all functions that used it
3304 previously. In many cases we assigned it incorrectly, because the
3305 functions might assert or call impure functions, and we don't have
3306 evidence that keeping the pure attribute is worthwhile. Implements
3307 changes suggested in ticket 4421.
3308 - Move the replay-detection cache for the RSA-encrypted parts of
3309 INTRODUCE2 cells to the introduction point data structures.
3310 Previously, we would use one replay-detection cache per hidden
3311 service. Required by fix for bug 3460.
3312 - The helper programs tor-gencert, tor-resolve, and tor-checkkey
3313 no longer link against Libevent: they never used it, but
3314 our library structure used to force them to link it.
3316 o Removed features and files:
3317 - Remove all internal support for unpadded RSA. We never used it, and
3318 it would be a bad idea to start.
3319 - Remove some workaround code for OpenSSL 0.9.6 (which is no longer
3321 - Remove some redundant #include directives throughout the code.
3322 Patch from Andrea Gelmini.
3323 - Remove some old code to remember statistics about which descriptors
3324 we've served as a directory mirror. The feature wasn't used and
3325 is outdated now that microdescriptors are around.
3326 - Remove some old code to work around even older versions of Tor that
3327 used forked processes to handle DNS requests. Such versions of Tor
3328 are no longer in use as relays.
3329 - The "torify" script no longer supports the "tsocks" socksifier
3330 tool, since tsocks doesn't support DNS and UDP right for Tor.
3331 Everyone should be using torsocks instead. Fixes bugs 3530 and
3332 5180. Based on a patch by "ugh".
3333 - Remove the torrc.bridge file: we don't use it for anything, and
3334 it had become badly desynchronized from torrc.sample. Resolves
3338 - Begin a doc/state-contents.txt file to explain the contents of
3339 the Tor state file. Fixes bug 2987.
3340 - Clarify the documentation for the Alternate*Authority options.
3342 - Document the --defaults-torrc option, and the new semantics for
3343 overriding, extending, and clearing lists of options. Closes
3345 - Add missing man page documentation for consensus and microdesc
3346 files. Resolves ticket 6732.
3347 - Fix some typos in the manpages. Patch from A. Costa. Fixes bug 6500.
3349 o Documentation fixes:
3350 - Improve the manual's documentation for the NT Service command-line
3351 options. Addresses ticket 3964.
3352 - Clarify SessionGroup documentation slightly; resolves ticket 5437.
3353 - Document the changes to the ORPort and DirPort options, and the
3354 fact that {OR/Dir}ListenAddress is now unnecessary (and
3355 therefore deprecated). Resolves ticket 5597.
3356 - Correct a broken faq link in the INSTALL file. Fixes bug 2307.
3357 - Clarify that hidden services are TCP only. Fixes bug 6024.
3360 Changes in version 0.2.2.39 - 2012-09-11
3361 Tor 0.2.2.39 fixes two more opportunities for remotely triggerable
3365 - Fix an assertion failure in tor_timegm() that could be triggered
3366 by a badly formatted directory object. Bug found by fuzzing with
3367 Radamsa. Fixes bug 6811; bugfix on 0.2.0.20-rc.
3368 - Do not crash when comparing an address with port value 0 to an
3369 address policy. This bug could have been used to cause a remote
3370 assertion failure by or against directory authorities, or to
3371 allow some applications to crash clients. Fixes bug 6690; bugfix
3375 Changes in version 0.2.2.38 - 2012-08-12
3376 Tor 0.2.2.38 fixes a remotely triggerable crash bug, and fixes a timing
3377 attack that could in theory leak path information.
3380 - Avoid an uninitialized memory read when reading a vote or consensus
3381 document that has an unrecognized flavor name. This read could
3382 lead to a remote crash bug. Fixes bug 6530; bugfix on 0.2.2.6-alpha.
3383 - Try to leak less information about what relays a client is
3384 choosing to a side-channel attacker. Previously, a Tor client would
3385 stop iterating through the list of available relays as soon as it
3386 had chosen one, thus finishing a little earlier when it picked
3387 a router earlier in the list. If an attacker can recover this
3388 timing information (nontrivial but not proven to be impossible),
3389 they could learn some coarse-grained information about which relays
3390 a client was picking (middle nodes in particular are likelier to
3391 be affected than exits). The timing attack might be mitigated by
3392 other factors (see bug 6537 for some discussion), but it's best
3393 not to take chances. Fixes bug 6537; bugfix on 0.0.8rc1.
3396 Changes in version 0.2.2.37 - 2012-06-06
3397 Tor 0.2.2.37 introduces a workaround for a critical renegotiation
3398 bug in OpenSSL 1.0.1 (where 20% of the Tor network can't talk to itself
3402 - Work around a bug in OpenSSL that broke renegotiation with TLS
3403 1.1 and TLS 1.2. Without this workaround, all attempts to speak
3404 the v2 Tor connection protocol when both sides were using OpenSSL
3405 1.0.1 would fail. Resolves ticket 6033.
3406 - When waiting for a client to renegotiate, don't allow it to add
3407 any bytes to the input buffer. This fixes a potential DoS issue.
3408 Fixes bugs 5934 and 6007; bugfix on 0.2.0.20-rc.
3409 - Fix an edge case where if we fetch or publish a hidden service
3410 descriptor, we might build a 4-hop circuit and then use that circuit
3411 for exiting afterwards -- even if the new last hop doesn't obey our
3412 ExitNodes config option. Fixes bug 5283; bugfix on 0.2.0.10-alpha.
3415 - Fix a build warning with Clang 3.1 related to our use of vasprintf.
3416 Fixes bug 5969. Bugfix on 0.2.2.11-alpha.
3419 - Tell GCC and Clang to check for any errors in format strings passed
3420 to the tor_v*(print|scan)f functions.
3423 Changes in version 0.2.2.36 - 2012-05-24
3424 Tor 0.2.2.36 updates the addresses for two of the eight directory
3425 authorities, fixes some potential anonymity and security issues,
3426 and fixes several crash bugs.
3428 Tor 0.2.1.x has reached its end-of-life. Those Tor versions have many
3429 known flaws, and nobody should be using them. You should upgrade. If
3430 you're using a Linux or BSD and its packages are obsolete, stop using
3431 those packages and upgrade anyway.
3433 o Directory authority changes:
3434 - Change IP address for maatuska (v3 directory authority).
3435 - Change IP address for ides (v3 directory authority), and rename
3439 - When building or running with any version of OpenSSL earlier
3440 than 0.9.8s or 1.0.0f, disable SSLv3 support. These OpenSSL
3441 versions have a bug (CVE-2011-4576) in which their block cipher
3442 padding includes uninitialized data, potentially leaking sensitive
3443 information to any peer with whom they make a SSLv3 connection. Tor
3444 does not use SSL v3 by default, but a hostile client or server
3445 could force an SSLv3 connection in order to gain information that
3446 they shouldn't have been able to get. The best solution here is to
3447 upgrade to OpenSSL 0.9.8s or 1.0.0f (or later). But when building
3448 or running with a non-upgraded OpenSSL, we disable SSLv3 entirely
3449 to make sure that the bug can't happen.
3450 - Never use a bridge or a controller-supplied node as an exit, even
3451 if its exit policy allows it. Found by wanoskarnet. Fixes bug
3452 5342. Bugfix on 0.1.1.15-rc (for controller-purpose descriptors)
3453 and 0.2.0.3-alpha (for bridge-purpose descriptors).
3454 - Only build circuits if we have a sufficient threshold of the total
3455 descriptors that are marked in the consensus with the "Exit"
3456 flag. This mitigates an attack proposed by wanoskarnet, in which
3457 all of a client's bridges collude to restrict the exit nodes that
3458 the client knows about. Fixes bug 5343.
3459 - Provide controllers with a safer way to implement the cookie
3460 authentication mechanism. With the old method, if another locally
3461 running program could convince a controller that it was the Tor
3462 process, then that program could trick the controller into telling
3463 it the contents of an arbitrary 32-byte file. The new "SAFECOOKIE"
3464 authentication method uses a challenge-response approach to prevent
3465 this attack. Fixes bug 5185; implements proposal 193.
3468 - Avoid logging uninitialized data when unable to decode a hidden
3469 service descriptor cookie. Fixes bug 5647; bugfix on 0.2.1.5-alpha.
3470 - Avoid a client-side assertion failure when receiving an INTRODUCE2
3471 cell on a general purpose circuit. Fixes bug 5644; bugfix on
3473 - Fix builds when the path to sed, openssl, or sha1sum contains
3474 spaces, which is pretty common on Windows. Fixes bug 5065; bugfix
3476 - Correct our replacements for the timeradd() and timersub() functions
3477 on platforms that lack them (for example, Windows). The timersub()
3478 function is used when expiring circuits, while timeradd() is
3479 currently unused. Bug report and patch by Vektor. Fixes bug 4778;
3480 bugfix on 0.2.2.24-alpha.
3481 - Fix the SOCKET_OK test that we use to tell when socket
3482 creation fails so that it works on Win64. Fixes part of bug 4533;
3483 bugfix on 0.2.2.29-beta. Bug found by wanoskarnet.
3486 - Reject out-of-range times like 23:59:61 in parse_rfc1123_time().
3487 Fixes bug 5346; bugfix on 0.0.8pre3.
3488 - Make our number-parsing functions always treat too-large values
3489 as an error, even when those values exceed the width of the
3490 underlying type. Previously, if the caller provided these
3491 functions with minima or maxima set to the extreme values of the
3492 underlying integer type, these functions would return those
3493 values on overflow rather than treating overflow as an error.
3494 Fixes part of bug 5786; bugfix on 0.0.9.
3495 - Older Linux kernels erroneously respond to strange nmap behavior
3496 by having accept() return successfully with a zero-length
3497 socket. When this happens, just close the connection. Previously,
3498 we would try harder to learn the remote address: but there was
3499 no such remote address to learn, and our method for trying to
3500 learn it was incorrect. Fixes bugs 1240, 4745, and 4747. Bugfix
3501 on 0.1.0.3-rc. Reported and diagnosed by "r1eo".
3502 - Correct parsing of certain date types in parse_http_time().
3503 Without this patch, If-Modified-Since would behave
3504 incorrectly. Fixes bug 5346; bugfix on 0.2.0.2-alpha. Patch from
3505 Esteban Manchado Velázques.
3506 - Change the BridgePassword feature (part of the "bridge community"
3507 design, which is not yet implemented) to use a time-independent
3508 comparison. The old behavior might have allowed an adversary
3509 to use timing to guess the BridgePassword value. Fixes bug 5543;
3510 bugfix on 0.2.0.14-alpha.
3511 - Detect and reject certain misformed escape sequences in
3512 configuration values. Previously, these values would cause us
3513 to crash if received in a torrc file or over an authenticated
3514 control port. Bug found by Esteban Manchado Velázquez, and
3515 independently by Robert Connolly from Matta Consulting who further
3516 noted that it allows a post-authentication heap overflow. Patch
3517 by Alexander Schrijver. Fixes bugs 5090 and 5402 (CVE 2012-1668);
3518 bugfix on 0.2.0.16-alpha.
3519 - Fix a compile warning when using the --enable-openbsd-malloc
3520 configure option. Fixes bug 5340; bugfix on 0.2.0.20-rc.
3521 - During configure, detect when we're building with clang version
3522 3.0 or lower and disable the -Wnormalized=id and -Woverride-init
3523 CFLAGS. clang doesn't support them yet.
3524 - When sending an HTTP/1.1 proxy request, include a Host header.
3525 Fixes bug 5593; bugfix on 0.2.2.1-alpha.
3526 - Fix a NULL-pointer dereference on a badly formed SETCIRCUITPURPOSE
3527 command. Found by mikeyc. Fixes bug 5796; bugfix on 0.2.2.9-alpha.
3528 - If we hit the error case where routerlist_insert() replaces an
3529 existing (old) server descriptor, make sure to remove that
3530 server descriptor from the old_routers list. Fix related to bug
3531 1776. Bugfix on 0.2.2.18-alpha.
3533 o Minor bugfixes (documentation and log messages):
3534 - Fix a typo in a log message in rend_service_rendezvous_has_opened().
3535 Fixes bug 4856; bugfix on Tor 0.0.6.
3536 - Update "ClientOnly" man page entry to explain that there isn't
3537 really any point to messing with it. Resolves ticket 5005.
3538 - Document the GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays
3539 directory authority option (introduced in Tor 0.2.2.34).
3540 - Downgrade the "We're missing a certificate" message from notice
3541 to info: people kept mistaking it for a real problem, whereas it
3542 is seldom the problem even when we are failing to bootstrap. Fixes
3543 bug 5067; bugfix on 0.2.0.10-alpha.
3544 - Correctly spell "connect" in a log message on failure to create a
3545 controlsocket. Fixes bug 4803; bugfix on 0.2.2.26-beta.
3546 - Clarify the behavior of MaxCircuitDirtiness with hidden service
3547 circuits. Fixes issue 5259.
3550 - Directory authorities now reject versions of Tor older than
3551 0.2.1.30, and Tor versions between 0.2.2.1-alpha and 0.2.2.20-alpha
3552 inclusive. These versions accounted for only a small fraction of
3553 the Tor network, and have numerous known security issues. Resolves
3555 - Update to the May 1 2012 Maxmind GeoLite Country database.
3558 - When sending or relaying a RELAY_EARLY cell, we used to convert
3559 it to a RELAY cell if the connection was using the v1 link
3560 protocol. This was a workaround for older versions of Tor, which
3561 didn't handle RELAY_EARLY cells properly. Now that all supported
3562 versions can handle RELAY_EARLY cells, and now that we're enforcing
3563 the "no RELAY_EXTEND commands except in RELAY_EARLY cells" rule,
3564 remove this workaround. Addresses bug 4786.
3567 Changes in version 0.2.2.35 - 2011-12-16
3568 Tor 0.2.2.35 fixes a critical heap-overflow security issue in Tor's
3569 buffers code. Absolutely everybody should upgrade.
3571 The bug relied on an incorrect calculation when making data continuous
3572 in one of our IO buffers, if the first chunk of the buffer was
3573 misaligned by just the wrong amount. The miscalculation would allow an
3574 attacker to overflow a piece of heap-allocated memory. To mount this
3575 attack, the attacker would need to either open a SOCKS connection to
3576 Tor's SocksPort (usually restricted to localhost), or target a Tor
3577 instance configured to make its connections through a SOCKS proxy
3578 (which Tor does not do by default).
3580 Good security practice requires that all heap-overflow bugs should be
3581 presumed to be exploitable until proven otherwise, so we are treating
3582 this as a potential code execution attack. Please upgrade immediately!
3583 This bug does not affect bufferevents-based builds of Tor. Special
3584 thanks to "Vektor" for reporting this issue to us!
3586 Tor 0.2.2.35 also fixes several bugs in previous versions, including
3587 crash bugs for unusual configurations, and a long-term bug that
3588 would prevent Tor from starting on Windows machines with draconian
3591 With this release, we remind everyone that 0.2.0.x has reached its
3592 formal end-of-life. Those Tor versions have many known flaws, and
3593 nobody should be using them. You should upgrade -- ideally to the
3594 0.2.2.x series. If you're using a Linux or BSD and its packages are
3595 obsolete, stop using those packages and upgrade anyway.
3597 The Tor 0.2.1.x series is also approaching its end-of-life: it will no
3598 longer receive support after some time in early 2012.
3601 - Fix a heap overflow bug that could occur when trying to pull
3602 data into the first chunk of a buffer, when that chunk had
3603 already had some data drained from it. Fixes CVE-2011-2778;
3604 bugfix on 0.2.0.16-alpha. Reported by "Vektor".
3605 - Initialize Libevent with the EVENT_BASE_FLAG_NOLOCK flag enabled, so
3606 that it doesn't attempt to allocate a socketpair. This could cause
3607 some problems on Windows systems with overzealous firewalls. Fix for
3608 bug 4457; workaround for Libevent versions 2.0.1-alpha through
3610 - If we mark an OR connection for close based on a cell we process,
3611 don't process any further cells on it. We already avoid further
3612 reads on marked-for-close connections, but now we also discard the
3613 cells we'd already read. Fixes bug 4299; bugfix on 0.2.0.10-alpha,
3614 which was the first version where we might mark a connection for
3615 close based on processing a cell on it.
3616 - Correctly sanity-check that we don't underflow on a memory
3617 allocation (and then assert) for hidden service introduction
3618 point decryption. Bug discovered by Dan Rosenberg. Fixes bug 4410;
3619 bugfix on 0.2.1.5-alpha.
3620 - Fix a memory leak when we check whether a hidden service
3621 descriptor has any usable introduction points left. Fixes bug
3622 4424. Bugfix on 0.2.2.25-alpha.
3623 - Don't crash when we're running as a relay and don't have a GeoIP
3624 file. Bugfix on 0.2.2.34; fixes bug 4340. This backports a fix
3625 we've had in the 0.2.3.x branch already.
3626 - When running as a client, do not print a misleading (and plain
3627 wrong) log message that we're collecting "directory request"
3628 statistics: clients don't collect statistics. Also don't create a
3629 useless (because empty) stats file in the stats/ directory. Fixes
3630 bug 4353; bugfix on 0.2.2.34.
3633 - Detect failure to initialize Libevent. This fix provides better
3634 detection for future instances of bug 4457.
3635 - Avoid frequent calls to the fairly expensive cull_wedged_cpuworkers
3636 function. This was eating up hideously large amounts of time on some
3637 busy servers. Fixes bug 4518; bugfix on 0.0.9.8.
3638 - Resolve an integer overflow bug in smartlist_ensure_capacity().
3639 Fixes bug 4230; bugfix on Tor 0.1.0.1-rc. Based on a patch by
3641 - Don't warn about unused log_mutex in log.c when building with
3642 --disable-threads using a recent GCC. Fixes bug 4437; bugfix on
3643 0.1.0.6-rc which introduced --disable-threads.
3644 - When configuring, starting, or stopping an NT service, stop
3645 immediately after the service configuration attempt has succeeded
3646 or failed. Fixes bug 3963; bugfix on 0.2.0.7-alpha.
3647 - When sending a NETINFO cell, include the original address
3648 received for the other side, not its canonical address. Found
3649 by "troll_un"; fixes bug 4349; bugfix on 0.2.0.10-alpha.
3650 - Fix a typo in a hibernation-related log message. Fixes bug 4331;
3651 bugfix on 0.2.2.23-alpha; found by "tmpname0901".
3652 - Fix a memory leak in launch_direct_bridge_descriptor_fetch() that
3653 occurred when a client tried to fetch a descriptor for a bridge
3654 in ExcludeNodes. Fixes bug 4383; bugfix on 0.2.2.25-alpha.
3655 - Backport fixes for a pair of compilation warnings on Windows.
3656 Fixes bug 4521; bugfix on 0.2.2.28-beta and on 0.2.2.29-beta.
3657 - If we had ever tried to call tor_addr_to_str on an address of
3658 unknown type, we would have done a strdup on an uninitialized
3659 buffer. Now we won't. Fixes bug 4529; bugfix on 0.2.1.3-alpha.
3660 Reported by "troll_un".
3661 - Correctly detect and handle transient lookup failures from
3662 tor_addr_lookup. Fixes bug 4530; bugfix on 0.2.1.5-alpha.
3663 Reported by "troll_un".
3664 - Fix null-pointer access that could occur if TLS allocation failed.
3665 Fixes bug 4531; bugfix on 0.2.0.20-rc. Found by "troll_un".
3666 - Use tor_socket_t type for listener argument to accept(). Fixes bug
3667 4535; bugfix on 0.2.2.28-beta. Found by "troll_un".
3670 - Add two new config options for directory authorities:
3671 AuthDirFastGuarantee sets a bandwidth threshold for guaranteeing the
3672 Fast flag, and AuthDirGuardBWGuarantee sets a bandwidth threshold
3673 that is always sufficient to satisfy the bandwidth requirement for
3674 the Guard flag. Now it will be easier for researchers to simulate
3675 Tor networks with different values. Resolves ticket 4484.
3676 - When Tor ignores a hidden service specified in its configuration,
3677 include the hidden service's directory in the warning message.
3678 Previously, we would only tell the user that some hidden service
3679 was ignored. Bugfix on 0.0.6; fixes bug 4426.
3680 - Update to the December 6 2011 Maxmind GeoLite Country database.
3682 o Packaging changes:
3683 - Make it easier to automate expert package builds on Windows,
3684 by removing an absolute path from makensis.exe command.
3687 Changes in version 0.2.1.32 - 2011-12-16
3688 Tor 0.2.1.32 backports important security and privacy fixes for
3689 oldstable. This release is intended only for package maintainers and
3690 others who cannot use the 0.2.2 stable series. All others should be
3691 using Tor 0.2.2.x or newer.
3693 The Tor 0.2.1.x series will reach formal end-of-life some time in
3694 early 2012; we will stop releasing patches for it then.
3696 o Major bugfixes (also included in 0.2.2.x):
3697 - Correctly sanity-check that we don't underflow on a memory
3698 allocation (and then assert) for hidden service introduction
3699 point decryption. Bug discovered by Dan Rosenberg. Fixes bug 4410;
3700 bugfix on 0.2.1.5-alpha.
3701 - Fix a heap overflow bug that could occur when trying to pull
3702 data into the first chunk of a buffer, when that chunk had
3703 already had some data drained from it. Fixes CVE-2011-2778;
3704 bugfix on 0.2.0.16-alpha. Reported by "Vektor".
3707 - Update to the December 6 2011 Maxmind GeoLite Country database.
3710 Changes in version 0.2.2.34 - 2011-10-26
3711 Tor 0.2.2.34 fixes a critical anonymity vulnerability where an attacker
3712 can deanonymize Tor users. Everybody should upgrade.
3714 The attack relies on four components: 1) Clients reuse their TLS cert
3715 when talking to different relays, so relays can recognize a user by
3716 the identity key in her cert. 2) An attacker who knows the client's
3717 identity key can probe each guard relay to see if that identity key
3718 is connected to that guard relay right now. 3) A variety of active
3719 attacks in the literature (starting from "Low-Cost Traffic Analysis
3720 of Tor" by Murdoch and Danezis in 2005) allow a malicious website to
3721 discover the guard relays that a Tor user visiting the website is using.
3722 4) Clients typically pick three guards at random, so the set of guards
3723 for a given user could well be a unique fingerprint for her. This
3724 release fixes components #1 and #2, which is enough to block the attack;
3725 the other two remain as open research problems. Special thanks to
3726 "frosty_un" for reporting the issue to us!
3728 Clients should upgrade so they are no longer recognizable by the TLS
3729 certs they present. Relays should upgrade so they no longer allow a
3730 remote attacker to probe them to test whether unpatched clients are
3731 currently connected to them.
3733 This release also fixes several vulnerabilities that allow an attacker
3734 to enumerate bridge relays. Some bridge enumeration attacks still
3735 remain; see for example proposal 188.
3737 o Privacy/anonymity fixes (clients):
3738 - Clients and bridges no longer send TLS certificate chains on
3739 outgoing OR connections. Previously, each client or bridge would
3740 use the same cert chain for all outgoing OR connections until
3741 its IP address changes, which allowed any relay that the client
3742 or bridge contacted to determine which entry guards it is using.
3743 Fixes CVE-2011-2768. Bugfix on 0.0.9pre5; found by "frosty_un".
3744 - If a relay receives a CREATE_FAST cell on a TLS connection, it
3745 no longer considers that connection as suitable for satisfying a
3746 circuit EXTEND request. Now relays can protect clients from the
3747 CVE-2011-2768 issue even if the clients haven't upgraded yet.
3748 - Directory authorities no longer assign the Guard flag to relays
3749 that haven't upgraded to the above "refuse EXTEND requests
3750 to client connections" fix. Now directory authorities can
3751 protect clients from the CVE-2011-2768 issue even if neither
3752 the clients nor the relays have upgraded yet. There's a new
3753 "GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays" config option
3754 to let us transition smoothly, else tomorrow there would be no
3757 o Privacy/anonymity fixes (bridge enumeration):
3758 - Bridge relays now do their directory fetches inside Tor TLS
3759 connections, like all the other clients do, rather than connecting
3760 directly to the DirPort like public relays do. Removes another
3761 avenue for enumerating bridges. Fixes bug 4115; bugfix on 0.2.0.35.
3762 - Bridges relays now build circuits for themselves in a more similar
3763 way to how clients build them. Removes another avenue for
3764 enumerating bridges. Fixes bug 4124; bugfix on 0.2.0.3-alpha,
3765 when bridges were introduced.
3766 - Bridges now refuse CREATE or CREATE_FAST cells on OR connections
3767 that they initiated. Relays could distinguish incoming bridge
3768 connections from client connections, creating another avenue for
3769 enumerating bridges. Fixes CVE-2011-2769. Bugfix on 0.2.0.3-alpha.
3770 Found by "frosty_un".
3773 - Fix a crash bug when changing node restrictions while a DNS lookup
3774 is in-progress. Fixes bug 4259; bugfix on 0.2.2.25-alpha. Bugfix
3776 - Don't launch a useless circuit after failing to use one of a
3777 hidden service's introduction points. Previously, we would
3778 launch a new introduction circuit, but not set the hidden service
3779 which that circuit was intended to connect to, so it would never
3780 actually be used. A different piece of code would then create a
3781 new introduction circuit correctly. Bug reported by katmagic and
3782 found by Sebastian Hahn. Bugfix on 0.2.1.13-alpha; fixes bug 4212.
3785 - Change an integer overflow check in the OpenBSD_Malloc code so
3786 that GCC is less likely to eliminate it as impossible. Patch
3787 from Mansour Moufid. Fixes bug 4059.
3788 - When a hidden service turns an extra service-side introduction
3789 circuit into a general-purpose circuit, free the rend_data and
3790 intro_key fields first, so we won't leak memory if the circuit
3791 is cannibalized for use as another service-side introduction
3792 circuit. Bugfix on 0.2.1.7-alpha; fixes bug 4251.
3793 - Bridges now skip DNS self-tests, to act a little more stealthily.
3794 Fixes bug 4201; bugfix on 0.2.0.3-alpha, which first introduced
3795 bridges. Patch by "warms0x".
3796 - Fix internal bug-checking logic that was supposed to catch
3797 failures in digest generation so that it will fail more robustly
3798 if we ask for a nonexistent algorithm. Found by Coverity Scan.
3799 Bugfix on 0.2.2.1-alpha; fixes Coverity CID 479.
3800 - Report any failure in init_keys() calls launched because our
3801 IP address has changed. Spotted by Coverity Scan. Bugfix on
3802 0.1.1.4-alpha; fixes CID 484.
3804 o Minor bugfixes (log messages and documentation):
3805 - Remove a confusing dollar sign from the example fingerprint in the
3806 man page, and also make the example fingerprint a valid one. Fixes
3807 bug 4309; bugfix on 0.2.1.3-alpha.
3808 - The next version of Windows will be called Windows 8, and it has
3809 a major version of 6, minor version of 2. Correctly identify that
3810 version instead of calling it "Very recent version". Resolves
3811 ticket 4153; reported by funkstar.
3812 - Downgrade log messages about circuit timeout calibration from
3813 "notice" to "info": they don't require or suggest any human
3814 intervention. Patch from Tom Lowenthal. Fixes bug 4063;
3815 bugfix on 0.2.2.14-alpha.
3818 - Turn on directory request statistics by default and include them in
3819 extra-info descriptors. Don't break if we have no GeoIP database.
3820 Backported from 0.2.3.1-alpha; implements ticket 3951.
3821 - Update to the October 4 2011 Maxmind GeoLite Country database.
3824 Changes in version 0.2.1.31 - 2011-10-26
3825 Tor 0.2.1.31 backports important security and privacy fixes for
3826 oldstable. This release is intended only for package maintainers and
3827 others who cannot use the 0.2.2 stable series. All others should be
3828 using Tor 0.2.2.x or newer.
3830 o Security fixes (also included in 0.2.2.x):
3831 - Replace all potentially sensitive memory comparison operations
3832 with versions whose runtime does not depend on the data being
3833 compared. This will help resist a class of attacks where an
3834 adversary can use variations in timing information to learn
3835 sensitive data. Fix for one case of bug 3122. (Safe memcmp
3836 implementation by Robert Ransom based partially on code by DJB.)
3837 - Fix an assert in parsing router descriptors containing IPv6
3838 addresses. This one took down the directory authorities when
3839 somebody tried some experimental code. Bugfix on 0.2.1.3-alpha.
3841 o Privacy/anonymity fixes (also included in 0.2.2.x):
3842 - Clients and bridges no longer send TLS certificate chains on
3843 outgoing OR connections. Previously, each client or bridge would
3844 use the same cert chain for all outgoing OR connections until
3845 its IP address changes, which allowed any relay that the client
3846 or bridge contacted to determine which entry guards it is using.
3847 Fixes CVE-2011-2768. Bugfix on 0.0.9pre5; found by "frosty_un".
3848 - If a relay receives a CREATE_FAST cell on a TLS connection, it
3849 no longer considers that connection as suitable for satisfying a
3850 circuit EXTEND request. Now relays can protect clients from the
3851 CVE-2011-2768 issue even if the clients haven't upgraded yet.
3852 - Bridges now refuse CREATE or CREATE_FAST cells on OR connections
3853 that they initiated. Relays could distinguish incoming bridge
3854 connections from client connections, creating another avenue for
3855 enumerating bridges. Fixes CVE-2011-2769. Bugfix on 0.2.0.3-alpha.
3856 Found by "frosty_un".
3857 - When receiving a hidden service descriptor, check that it is for
3858 the hidden service we wanted. Previously, Tor would store any
3859 hidden service descriptors that a directory gave it, whether it
3860 wanted them or not. This wouldn't have let an attacker impersonate
3861 a hidden service, but it did let directories pre-seed a client
3862 with descriptors that it didn't want. Bugfix on 0.0.6.
3863 - Avoid linkability based on cached hidden service descriptors: forget
3864 all hidden service descriptors cached as a client when processing a
3865 SIGNAL NEWNYM command. Fixes bug 3000; bugfix on 0.0.6.
3866 - Make the bridge directory authority refuse to answer directory
3867 requests for "all" descriptors. It used to include bridge
3868 descriptors in its answer, which was a major information leak.
3869 Found by "piebeer". Bugfix on 0.2.0.3-alpha.
3870 - Don't attach new streams to old rendezvous circuits after SIGNAL
3871 NEWNYM. Previously, we would keep using an existing rendezvous
3872 circuit if it remained open (i.e. if it were kept open by a
3873 long-lived stream, or if a new stream were attached to it before
3874 Tor could notice that it was old and no longer in use). Bugfix on
3875 0.1.1.15-rc; fixes bug 3375.
3877 o Minor bugfixes (also included in 0.2.2.x):
3878 - When we restart our relay, we might get a successful connection
3879 from the outside before we've started our reachability tests,
3880 triggering a warning: "ORPort found reachable, but I have no
3881 routerinfo yet. Failing to inform controller of success." This
3882 bug was harmless unless Tor is running under a controller
3883 like Vidalia, in which case the controller would never get a
3884 REACHABILITY_SUCCEEDED status event. Bugfix on 0.1.2.6-alpha;
3886 - Build correctly on OSX with zlib 1.2.4 and higher with all warnings
3887 enabled. Fixes bug 1526.
3888 - Remove undocumented option "-F" from tor-resolve: it hasn't done
3889 anything since 0.2.1.16-rc.
3890 - Avoid signed/unsigned comparisons by making SIZE_T_CEILING unsigned.
3891 None of the cases where we did this before were wrong, but by making
3892 this change we avoid warnings. Fixes bug 2475; bugfix on 0.2.1.28.
3893 - Fix a rare crash bug that could occur when a client was configured
3894 with a large number of bridges. Fixes bug 2629; bugfix on
3895 0.2.1.2-alpha. Bugfix by trac user "shitlei".
3896 - Correct the warning displayed when a rendezvous descriptor exceeds
3897 the maximum size. Fixes bug 2750; bugfix on 0.2.1.5-alpha. Found by
3899 - Fix an uncommon assertion failure when running with DNSPort under
3900 heavy load. Fixes bug 2933; bugfix on 0.2.0.1-alpha.
3901 - When warning about missing zlib development packages during compile,
3902 give the correct package names. Bugfix on 0.2.0.1-alpha.
3903 - Require that introduction point keys and onion keys have public
3904 exponent 65537. Bugfix on 0.2.0.10-alpha.
3905 - Do not crash when our configuration file becomes unreadable, for
3906 example due to a permissions change, between when we start up
3907 and when a controller calls SAVECONF. Fixes bug 3135; bugfix
3909 - Fix warnings from GCC 4.6's "-Wunused-but-set-variable" option.
3911 - Always NUL-terminate the sun_path field of a sockaddr_un before
3912 passing it to the kernel. (Not a security issue: kernels are
3913 smart enough to reject bad sockaddr_uns.) Found by Coverity;
3914 CID #428. Bugfix on Tor 0.2.0.3-alpha.
3915 - Don't stack-allocate the list of supplementary GIDs when we're
3916 about to log them. Stack-allocating NGROUPS_MAX gid_t elements
3917 could take up to 256K, which is way too much stack. Found by
3918 Coverity; CID #450. Bugfix on 0.2.1.7-alpha.
3920 o Minor bugfixes (only in 0.2.1.x):
3921 - Resume using micro-version numbers in 0.2.1.x: our Debian packages
3922 rely on them. Bugfix on 0.2.1.30.
3923 - Use git revisions instead of svn revisions when generating our
3924 micro-version numbers. Bugfix on 0.2.1.15-rc; fixes bug 2402.
3926 o Minor features (also included in 0.2.2.x):
3927 - Adjust the expiration time on our SSL session certificates to
3928 better match SSL certs seen in the wild. Resolves ticket 4014.
3929 - Allow nameservers with IPv6 address. Resolves bug 2574.
3930 - Update to the October 4 2011 Maxmind GeoLite Country database.
3933 Changes in version 0.2.2.33 - 2011-09-13
3934 Tor 0.2.2.33 fixes several bugs, and includes a slight tweak to Tor's
3935 TLS handshake that makes relays and bridges that run this new version
3936 reachable from Iran again.
3939 - Avoid an assertion failure when reloading a configuration with
3940 TrackExitHosts changes. Found and fixed by 'laruldan'. Fixes bug
3941 3923; bugfix on 0.2.2.25-alpha.
3943 o Minor features (security):
3944 - Check for replays of the public-key encrypted portion of an
3945 INTRODUCE1 cell, in addition to the current check for replays of
3946 the g^x value. This prevents a possible class of active attacks
3947 by an attacker who controls both an introduction point and a
3948 rendezvous point, and who uses the malleability of AES-CTR to
3949 alter the encrypted g^x portion of the INTRODUCE1 cell. We think
3950 that these attacks are infeasible (requiring the attacker to send
3951 on the order of zettabytes of altered cells in a short interval),
3952 but we'd rather block them off in case there are any classes of
3953 this attack that we missed. Reported by Willem Pinckaers.
3956 - Adjust the expiration time on our SSL session certificates to
3957 better match SSL certs seen in the wild. Resolves ticket 4014.
3958 - Change the default required uptime for a relay to be accepted as
3959 a HSDir (hidden service directory) from 24 hours to 25 hours.
3960 Improves on 0.2.0.10-alpha; resolves ticket 2649.
3961 - Add a VoteOnHidServDirectoriesV2 config option to allow directory
3962 authorities to abstain from voting on assignment of the HSDir
3963 consensus flag. Related to bug 2649.
3964 - Update to the September 6 2011 Maxmind GeoLite Country database.
3966 o Minor bugfixes (documentation and log messages):
3967 - Correct the man page to explain that HashedControlPassword and
3968 CookieAuthentication can both be set, in which case either method
3969 is sufficient to authenticate to Tor. Bugfix on 0.2.0.7-alpha,
3970 when we decided to allow these config options to both be set. Issue
3972 - Demote the 'replay detected' log message emitted when a hidden
3973 service receives the same Diffie-Hellman public key in two different
3974 INTRODUCE2 cells to info level. A normal Tor client can cause that
3975 log message during its normal operation. Bugfix on 0.2.1.6-alpha;
3976 fixes part of bug 2442.
3977 - Demote the 'INTRODUCE2 cell is too {old,new}' log message to info
3978 level. There is nothing that a hidden service's operator can do
3979 to fix its clients' clocks. Bugfix on 0.2.1.6-alpha; fixes part
3981 - Clarify a log message specifying the characters permitted in
3982 HiddenServiceAuthorizeClient client names. Previously, the log
3983 message said that "[A-Za-z0-9+-_]" were permitted; that could have
3984 given the impression that every ASCII character between "+" and "_"
3985 was permitted. Now we say "[A-Za-z0-9+_-]". Bugfix on 0.2.1.5-alpha.
3988 - Provide a substitute implementation of lround() for MSVC, which
3989 apparently lacks it. Patch from Gisle Vanem.
3990 - Clean up some code issues that prevented Tor from building on older
3991 BSDs. Fixes bug 3894; reported by "grarpamp".
3992 - Search for a platform-specific version of "ar" when cross-compiling.
3993 Should fix builds on iOS. Resolves bug 3909, found by Marco Bonetti.
3996 Changes in version 0.2.2.32 - 2011-08-27
3997 The Tor 0.2.2 release series is dedicated to the memory of Andreas
3998 Pfitzmann (1958-2010), a pioneer in anonymity and privacy research,
3999 a founder of the PETS community, a leader in our field, a mentor,
4000 and a friend. He left us with these words: "I had the possibility
4001 to contribute to this world that is not as it should be. I hope I
4002 could help in some areas to make the world a better place, and that
4003 I could also encourage other people to be engaged in improving the
4004 world. Please, stay engaged. This world needs you, your love, your
4005 initiative -- now I cannot be part of that anymore."
4007 Tor 0.2.2.32, the first stable release in the 0.2.2 branch, is finally
4008 ready. More than two years in the making, this release features improved
4009 client performance and hidden service reliability, better compatibility
4010 for Android, correct behavior for bridges that listen on more than
4011 one address, more extensible and flexible directory object handling,
4012 better reporting of network statistics, improved code security, and
4013 many many other features and bugfixes.
4015 o Major features (client performance):
4016 - When choosing which cells to relay first, relays now favor circuits
4017 that have been quiet recently, to provide lower latency for
4018 low-volume circuits. By default, relays enable or disable this
4019 feature based on a setting in the consensus. They can override
4020 this default by using the new "CircuitPriorityHalflife" config
4021 option. Design and code by Ian Goldberg, Can Tang, and Chris
4023 - Directory authorities now compute consensus weightings that instruct
4024 clients how to weight relays flagged as Guard, Exit, Guard+Exit,
4025 and no flag. Clients use these weightings to distribute network load
4026 more evenly across these different relay types. The weightings are
4027 in the consensus so we can change them globally in the future. Extra
4028 thanks to "outofwords" for finding some nasty security bugs in
4029 the first implementation of this feature.
4031 o Major features (client performance, circuit build timeout):
4032 - Tor now tracks how long it takes to build client-side circuits
4033 over time, and adapts its timeout to local network performance.
4034 Since a circuit that takes a long time to build will also provide
4035 bad performance, we get significant latency improvements by
4036 discarding the slowest 20% of circuits. Specifically, Tor creates
4037 circuits more aggressively than usual until it has enough data
4038 points for a good timeout estimate. Implements proposal 151.
4039 - Circuit build timeout constants can be controlled by consensus
4040 parameters. We set good defaults for these parameters based on
4041 experimentation on broadband and simulated high-latency links.
4042 - Circuit build time learning can be disabled via consensus parameter
4043 or by the client via a LearnCircuitBuildTimeout config option. We
4044 also automatically disable circuit build time calculation if either
4045 AuthoritativeDirectory is set, or if we fail to write our state
4046 file. Implements ticket 1296.
4048 o Major features (relays use their capacity better):
4049 - Set SO_REUSEADDR socket option on all sockets, not just
4050 listeners. This should help busy exit nodes avoid running out of
4051 useable ports just because all the ports have been used in the
4052 near past. Resolves issue 2850.
4053 - Relays now save observed peak bandwidth throughput rates to their
4054 state file (along with total usage, which was already saved),
4055 so that they can determine their correct estimated bandwidth on
4056 restart. Resolves bug 1863, where Tor relays would reset their
4057 estimated bandwidth to 0 after restarting.
4058 - Lower the maximum weighted-fractional-uptime cutoff to 98%. This
4059 should give us approximately 40-50% more Guard-flagged nodes,
4060 improving the anonymity the Tor network can provide and also
4061 decreasing the dropoff in throughput that relays experience when
4062 they first get the Guard flag.
4063 - Directory authorities now take changes in router IP address and
4064 ORPort into account when determining router stability. Previously,
4065 if a router changed its IP or ORPort, the authorities would not
4066 treat it as having any downtime for the purposes of stability
4067 calculation, whereas clients would experience downtime since the
4068 change would take a while to propagate to them. Resolves issue 1035.
4069 - New AccelName and AccelDir options add support for dynamic OpenSSL
4070 hardware crypto acceleration engines.
4072 o Major features (relays control their load better):
4073 - Exit relays now try harder to block exit attempts from unknown
4074 relays, to make it harder for people to use them as one-hop proxies
4075 a la tortunnel. Controlled by the refuseunknownexits consensus
4076 parameter (currently enabled), or you can override it on your
4077 relay with the RefuseUnknownExits torrc option. Resolves bug 1751;
4078 based on a variant of proposal 163.
4079 - Add separate per-conn write limiting to go with the per-conn read
4080 limiting. We added a global write limit in Tor 0.1.2.5-alpha,
4081 but never per-conn write limits.
4082 - New consensus params "bwconnrate" and "bwconnburst" to let us
4083 rate-limit client connections as they enter the network. It's
4084 controlled in the consensus so we can turn it on and off for
4085 experiments. It's starting out off. Based on proposal 163.
4087 o Major features (controllers):
4088 - Export GeoIP information on bridge usage to controllers even if we
4089 have not yet been running for 24 hours. Now Vidalia bridge operators
4090 can get more accurate and immediate feedback about their
4091 contributions to the network.
4092 - Add an __OwningControllerProcess configuration option and a
4093 TAKEOWNERSHIP control-port command. Now a Tor controller can ensure
4094 that when it exits, Tor will shut down. Implements feature 3049.
4096 o Major features (directory authorities):
4097 - Directory authorities now create, vote on, and serve multiple
4098 parallel formats of directory data as part of their voting process.
4099 Partially implements Proposal 162: "Publish the consensus in
4101 - Directory authorities now agree on and publish small summaries
4102 of router information that clients can use in place of regular
4103 server descriptors. This transition will allow Tor 0.2.3 clients
4104 to use far less bandwidth for downloading information about the
4105 network. Begins the implementation of Proposal 158: "Clients
4106 download consensus + microdescriptors".
4107 - The directory voting system is now extensible to use multiple hash
4108 algorithms for signatures and resource selection. Newer formats
4109 are signed with SHA256, with a possibility for moving to a better
4110 hash algorithm in the future.
4111 - Directory authorities can now vote on arbitary integer values as
4112 part of the consensus process. This is designed to help set
4113 network-wide parameters. Implements proposal 167.
4115 o Major features and bugfixes (node selection):
4116 - Revise and reconcile the meaning of the ExitNodes, EntryNodes,
4117 ExcludeEntryNodes, ExcludeExitNodes, ExcludeNodes, and Strict*Nodes
4118 options. Previously, we had been ambiguous in describing what
4119 counted as an "exit" node, and what operations exactly "StrictNodes
4120 0" would permit. This created confusion when people saw nodes built
4121 through unexpected circuits, and made it hard to tell real bugs from
4122 surprises. Now the intended behavior is:
4123 . "Exit", in the context of ExitNodes and ExcludeExitNodes, means
4124 a node that delivers user traffic outside the Tor network.
4125 . "Entry", in the context of EntryNodes, means a node used as the
4126 first hop of a multihop circuit. It doesn't include direct
4127 connections to directory servers.
4128 . "ExcludeNodes" applies to all nodes.
4129 . "StrictNodes" changes the behavior of ExcludeNodes only. When
4130 StrictNodes is set, Tor should avoid all nodes listed in
4131 ExcludeNodes, even when it will make user requests fail. When
4132 StrictNodes is *not* set, then Tor should follow ExcludeNodes
4133 whenever it can, except when it must use an excluded node to
4134 perform self-tests, connect to a hidden service, provide a
4135 hidden service, fulfill a .exit request, upload directory
4136 information, or fetch directory information.
4137 Collectively, the changes to implement the behavior fix bug 1090.
4138 - If EntryNodes, ExitNodes, ExcludeNodes, or ExcludeExitNodes
4139 change during a config reload, mark and discard all our origin
4140 circuits. This fix should address edge cases where we change the
4141 config options and but then choose a circuit that we created before
4143 - Make EntryNodes config option much more aggressive even when
4144 StrictNodes is not set. Before it would prepend your requested
4145 entrynodes to your list of guard nodes, but feel free to use others
4146 after that. Now it chooses only from your EntryNodes if any of
4147 those are available, and only falls back to others if a) they're
4148 all down and b) StrictNodes is not set.
4149 - Now we refresh your entry guards from EntryNodes at each consensus
4150 fetch -- rather than just at startup and then they slowly rot as
4151 the network changes.
4152 - Add support for the country code "{??}" in torrc options like
4153 ExcludeNodes, to indicate all routers of unknown country. Closes
4155 - ExcludeNodes now takes precedence over EntryNodes and ExitNodes: if
4156 a node is listed in both, it's treated as excluded.
4157 - ExcludeNodes now applies to directory nodes -- as a preference if
4158 StrictNodes is 0, or an absolute requirement if StrictNodes is 1.
4159 Don't exclude all the directory authorities and set StrictNodes to 1
4160 unless you really want your Tor to break.
4161 - ExcludeNodes and ExcludeExitNodes now override exit enclaving.
4162 - ExcludeExitNodes now overrides .exit requests.
4163 - We don't use bridges listed in ExcludeNodes.
4164 - When StrictNodes is 1:
4165 . We now apply ExcludeNodes to hidden service introduction points
4166 and to rendezvous points selected by hidden service users. This
4167 can make your hidden service less reliable: use it with caution!
4168 . If we have used ExcludeNodes on ourself, do not try relay
4169 reachability self-tests.
4170 . If we have excluded all the directory authorities, we will not
4171 even try to upload our descriptor if we're a relay.
4172 . Do not honor .exit requests to an excluded node.
4173 - When the set of permitted nodes changes, we now remove any mappings
4174 introduced via TrackExitHosts to now-excluded nodes. Bugfix on
4176 - We never cannibalize a circuit that had excluded nodes on it, even
4177 if StrictNodes is 0. Bugfix on 0.1.0.1-rc.
4178 - Improve log messages related to excluded nodes.
4180 o Major features (misc):
4181 - Numerous changes, bugfixes, and workarounds from Nathan Freitas
4182 to help Tor build correctly for Android phones.
4183 - The options SocksPort, ControlPort, and so on now all accept a
4184 value "auto" that opens a socket on an OS-selected port. A
4185 new ControlPortWriteToFile option tells Tor to write its
4186 actual control port or ports to a chosen file. If the option
4187 ControlPortFileGroupReadable is set, the file is created as
4188 group-readable. Now users can run two Tor clients on the same
4189 system without needing to manually mess with parameters. Resolves
4190 part of ticket 3076.
4191 - Tor now supports tunneling all of its outgoing connections over
4192 a SOCKS proxy, using the SOCKS4Proxy and/or SOCKS5Proxy
4193 configuration options. Code by Christopher Davis.
4195 o Code security improvements:
4196 - Replace all potentially sensitive memory comparison operations
4197 with versions whose runtime does not depend on the data being
4198 compared. This will help resist a class of attacks where an
4199 adversary can use variations in timing information to learn
4200 sensitive data. Fix for one case of bug 3122. (Safe memcmp
4201 implementation by Robert Ransom based partially on code by DJB.)
4202 - Enable Address Space Layout Randomization (ASLR) and Data Execution
4203 Prevention (DEP) by default on Windows to make it harder for
4204 attackers to exploit vulnerabilities. Patch from John Brooks.
4205 - New "--enable-gcc-hardening" ./configure flag (off by default)
4206 to turn on gcc compile time hardening options. It ensures
4207 that signed ints have defined behavior (-fwrapv), enables
4208 -D_FORTIFY_SOURCE=2 (requiring -O2), adds stack smashing protection
4209 with canaries (-fstack-protector-all), turns on ASLR protection if
4210 supported by the kernel (-fPIE, -pie), and adds additional security
4211 related warnings. Verified to work on Mac OS X and Debian Lenny.
4212 - New "--enable-linker-hardening" ./configure flag (off by default)
4213 to turn on ELF specific hardening features (relro, now). This does
4214 not work with Mac OS X or any other non-ELF binary format.
4215 - Always search the Windows system directory for system DLLs, and
4216 nowhere else. Bugfix on 0.1.1.23; fixes bug 1954.
4217 - New DisableAllSwap option. If set to 1, Tor will attempt to lock all
4218 current and future memory pages via mlockall(). On supported
4219 platforms (modern Linux and probably BSD but not Windows or OS X),
4220 this should effectively disable any and all attempts to page out
4221 memory. This option requires that you start your Tor as root --
4222 if you use DisableAllSwap, please consider using the User option
4223 to properly reduce the privileges of your Tor.
4225 o Major bugfixes (crashes):
4226 - Fix crash bug on platforms where gmtime and localtime can return
4227 NULL. Windows 7 users were running into this one. Fixes part of bug
4228 2077. Bugfix on all versions of Tor. Found by boboper.
4229 - Introduce minimum/maximum values that clients will believe
4230 from the consensus. Now we'll have a better chance to avoid crashes
4231 or worse when a consensus param has a weird value.
4232 - Fix a rare crash bug that could occur when a client was configured
4233 with a large number of bridges. Fixes bug 2629; bugfix on
4234 0.2.1.2-alpha. Bugfix by trac user "shitlei".
4235 - Do not crash when our configuration file becomes unreadable, for
4236 example due to a permissions change, between when we start up
4237 and when a controller calls SAVECONF. Fixes bug 3135; bugfix
4239 - If we're in the pathological case where there's no exit bandwidth
4240 but there is non-exit bandwidth, or no guard bandwidth but there
4241 is non-guard bandwidth, don't crash during path selection. Bugfix
4243 - Fix a crash bug when trying to initialize the evdns module in
4244 Libevent 2. Bugfix on 0.2.1.16-rc.
4246 o Major bugfixes (stability):
4247 - Fix an assert in parsing router descriptors containing IPv6
4248 addresses. This one took down the directory authorities when
4249 somebody tried some experimental code. Bugfix on 0.2.1.3-alpha.
4250 - Fix an uncommon assertion failure when running with DNSPort under
4251 heavy load. Fixes bug 2933; bugfix on 0.2.0.1-alpha.
4252 - Treat an unset $HOME like an empty $HOME rather than triggering an
4253 assert. Bugfix on 0.0.8pre1; fixes bug 1522.
4254 - More gracefully handle corrupt state files, removing asserts
4255 in favor of saving a backup and resetting state.
4256 - Instead of giving an assertion failure on an internal mismatch
4257 on estimated freelist size, just log a BUG warning and try later.
4258 Mitigates but does not fix bug 1125.
4259 - Fix an assert that got triggered when using the TestingTorNetwork
4260 configuration option and then issuing a GETINFO config-text control
4261 command. Fixes bug 2250; bugfix on 0.2.1.2-alpha.
4262 - If the cached cert file is unparseable, warn but don't exit.
4264 o Privacy fixes (relays/bridges):
4265 - Don't list Windows capabilities in relay descriptors. We never made
4266 use of them, and maybe it's a bad idea to publish them. Bugfix
4268 - If the Nickname configuration option isn't given, Tor would pick a
4269 nickname based on the local hostname as the nickname for a relay.
4270 Because nicknames are not very important in today's Tor and the
4271 "Unnamed" nickname has been implemented, this is now problematic
4272 behavior: It leaks information about the hostname without being
4273 useful at all. Fixes bug 2979; bugfix on 0.1.2.2-alpha, which
4274 introduced the Unnamed nickname. Reported by tagnaq.
4275 - Maintain separate TLS contexts and certificates for incoming and
4276 outgoing connections in bridge relays. Previously we would use the
4277 same TLS contexts and certs for incoming and outgoing connections.
4278 Bugfix on 0.2.0.3-alpha; addresses bug 988.
4279 - Maintain separate identity keys for incoming and outgoing TLS
4280 contexts in bridge relays. Previously we would use the same
4281 identity keys for incoming and outgoing TLS contexts. Bugfix on
4282 0.2.0.3-alpha; addresses the other half of bug 988.
4283 - Make the bridge directory authority refuse to answer directory
4284 requests for "all descriptors". It used to include bridge
4285 descriptors in its answer, which was a major information leak.
4286 Found by "piebeer". Bugfix on 0.2.0.3-alpha.
4288 o Privacy fixes (clients):
4289 - When receiving a hidden service descriptor, check that it is for
4290 the hidden service we wanted. Previously, Tor would store any
4291 hidden service descriptors that a directory gave it, whether it
4292 wanted them or not. This wouldn't have let an attacker impersonate
4293 a hidden service, but it did let directories pre-seed a client
4294 with descriptors that it didn't want. Bugfix on 0.0.6.
4295 - Start the process of disabling ".exit" address notation, since it
4296 can be used for a variety of esoteric application-level attacks
4297 on users. To reenable it, set "AllowDotExit 1" in your torrc. Fix
4299 - Reject attempts at the client side to open connections to private
4300 IP addresses (like 127.0.0.1, 10.0.0.1, and so on) with
4301 a randomly chosen exit node. Attempts to do so are always
4302 ill-defined, generally prevented by exit policies, and usually
4303 in error. This will also help to detect loops in transparent
4304 proxy configurations. You can disable this feature by setting
4305 "ClientRejectInternalAddresses 0" in your torrc.
4306 - Log a notice when we get a new control connection. Now it's easier
4307 for security-conscious users to recognize when a local application
4308 is knocking on their controller door. Suggested by bug 1196.
4310 o Privacy fixes (newnym):
4311 - Avoid linkability based on cached hidden service descriptors: forget
4312 all hidden service descriptors cached as a client when processing a
4313 SIGNAL NEWNYM command. Fixes bug 3000; bugfix on 0.0.6.
4314 - On SIGHUP, do not clear out all TrackHostExits mappings, client
4315 DNS cache entries, and virtual address mappings: that's what
4316 NEWNYM is for. Fixes bug 1345; bugfix on 0.1.0.1-rc.
4317 - Don't attach new streams to old rendezvous circuits after SIGNAL
4318 NEWNYM. Previously, we would keep using an existing rendezvous
4319 circuit if it remained open (i.e. if it were kept open by a
4320 long-lived stream, or if a new stream were attached to it before
4321 Tor could notice that it was old and no longer in use). Bugfix on
4322 0.1.1.15-rc; fixes bug 3375.
4324 o Major bugfixes (relay bandwidth accounting):
4325 - Fix a bug that could break accounting on 64-bit systems with large
4326 time_t values, making them hibernate for impossibly long intervals.
4327 Fixes bug 2146. Bugfix on 0.0.9pre6; fix by boboper.
4328 - Fix a bug in bandwidth accounting that could make us use twice
4329 the intended bandwidth when our interval start changes due to
4330 daylight saving time. Now we tolerate skew in stored vs computed
4331 interval starts: if the start of the period changes by no more than
4332 50% of the period's duration, we remember bytes that we transferred
4333 in the old period. Fixes bug 1511; bugfix on 0.0.9pre5.
4335 o Major bugfixes (bridges):
4336 - Bridges now use "reject *:*" as their default exit policy. Bugfix
4337 on 0.2.0.3-alpha. Fixes bug 1113.
4338 - If you configure your bridge with a known identity fingerprint,
4339 and the bridge authority is unreachable (as it is in at least
4340 one country now), fall back to directly requesting the descriptor
4341 from the bridge. Finishes the feature started in 0.2.0.10-alpha;
4343 - Fix a bug where bridge users who configure the non-canonical
4344 address of a bridge automatically switch to its canonical
4345 address. If a bridge listens at more than one address, it
4346 should be able to advertise those addresses independently and
4347 any non-blocked addresses should continue to work. Bugfix on Tor
4348 0.2.0.3-alpha. Fixes bug 2510.
4349 - If you configure Tor to use bridge A, and then quit and
4350 configure Tor to use bridge B instead (or if you change Tor
4351 to use bridge B via the controller), it would happily continue
4352 to use bridge A if it's still reachable. While this behavior is
4353 a feature if your goal is connectivity, in some scenarios it's a
4354 dangerous bug. Bugfix on Tor 0.2.0.1-alpha; fixes bug 2511.
4355 - When the controller configures a new bridge, don't wait 10 to 60
4356 seconds before trying to fetch its descriptor. Bugfix on
4357 0.2.0.3-alpha; fixes bug 3198 (suggested by 2355).
4359 o Major bugfixes (directory authorities):
4360 - Many relays have been falling out of the consensus lately because
4361 not enough authorities know about their descriptor for them to get
4362 a majority of votes. When we deprecated the v2 directory protocol,
4363 we got rid of the only way that v3 authorities can hear from each
4364 other about other descriptors. Now authorities examine every v3
4365 vote for new descriptors, and fetch them from that authority. Bugfix
4367 - Authorities could be tricked into giving out the Exit flag to relays
4368 that didn't allow exiting to any ports. This bug could screw
4369 with load balancing and stats. Bugfix on 0.1.1.6-alpha; fixes bug
4370 1238. Bug discovered by Martin Kowalczyk.
4371 - If all authorities restart at once right before a consensus vote,
4372 nobody will vote about "Running", and clients will get a consensus
4373 with no usable relays. Instead, authorities refuse to build a
4374 consensus if this happens. Bugfix on 0.2.0.10-alpha; fixes bug 1066.
4376 o Major bugfixes (stream-level fairness):
4377 - When receiving a circuit-level SENDME for a blocked circuit, try
4378 to package cells fairly from all the streams that had previously
4379 been blocked on that circuit. Previously, we had started with the
4380 oldest stream, and allowed each stream to potentially exhaust
4381 the circuit's package window. This gave older streams on any
4382 given circuit priority over newer ones. Fixes bug 1937. Detected
4383 originally by Camilo Viecco. This bug was introduced before the
4384 first Tor release, in svn commit r152: it is the new winner of
4385 the longest-lived bug prize.
4386 - Fix a stream fairness bug that would cause newer streams on a given
4387 circuit to get preference when reading bytes from the origin or
4388 destination. Fixes bug 2210. Fix by Mashael AlSabah. This bug was
4389 introduced before the first Tor release, in svn revision r152.
4390 - When the exit relay got a circuit-level sendme cell, it started
4391 reading on the exit streams, even if had 500 cells queued in the
4392 circuit queue already, so the circuit queue just grew and grew in
4393 some cases. We fix this by not re-enabling reading on receipt of a
4394 sendme cell when the cell queue is blocked. Fixes bug 1653. Bugfix
4395 on 0.2.0.1-alpha. Detected by Mashael AlSabah. Original patch by
4397 - Newly created streams were allowed to read cells onto circuits,
4398 even if the circuit's cell queue was blocked and waiting to drain.
4399 This created potential unfairness, as older streams would be
4400 blocked, but newer streams would gladly fill the queue completely.
4401 We add code to detect this situation and prevent any stream from
4402 getting more than one free cell. Bugfix on 0.2.0.1-alpha. Partially
4405 o Major bugfixes (hidden services):
4406 - Apply circuit timeouts to opened hidden-service-related circuits
4407 based on the correct start time. Previously, we would apply the
4408 circuit build timeout based on time since the circuit's creation;
4409 it was supposed to be applied based on time since the circuit
4410 entered its current state. Bugfix on 0.0.6; fixes part of bug 1297.
4411 - Improve hidden service robustness: When we find that we have
4412 extended a hidden service's introduction circuit to a relay not
4413 listed as an introduction point in the HS descriptor we currently
4414 have, retry with an introduction point from the current
4415 descriptor. Previously we would just give up. Fixes bugs 1024 and
4416 1930; bugfix on 0.2.0.10-alpha.
4417 - Directory authorities now use data collected from their own
4418 uptime observations when choosing whether to assign the HSDir flag
4419 to relays, instead of trusting the uptime value the relay reports in
4420 its descriptor. This change helps prevent an attack where a small
4421 set of nodes with frequently-changing identity keys can blackhole
4422 a hidden service. (Only authorities need upgrade; others will be
4423 fine once they do.) Bugfix on 0.2.0.10-alpha; fixes bug 2709.
4424 - Stop assigning the HSDir flag to relays that disable their
4425 DirPort (and thus will refuse to answer directory requests). This
4426 fix should dramatically improve the reachability of hidden services:
4427 hidden services and hidden service clients pick six HSDir relays
4428 to store and retrieve the hidden service descriptor, and currently
4429 about half of the HSDir relays will refuse to work. Bugfix on
4430 0.2.0.10-alpha; fixes part of bug 1693.
4432 o Major bugfixes (misc):
4433 - Clients now stop trying to use an exit node associated with a given
4434 destination by TrackHostExits if they fail to reach that exit node.
4435 Fixes bug 2999. Bugfix on 0.2.0.20-rc.
4436 - Fix a regression that caused Tor to rebind its ports if it receives
4437 SIGHUP while hibernating. Bugfix in 0.1.1.6-alpha; closes bug 919.
4438 - Remove an extra pair of quotation marks around the error
4439 message in control-port STATUS_GENERAL BUG events. Bugfix on
4440 0.1.2.6-alpha; fixes bug 3732.
4442 o Minor features (relays):
4443 - Ensure that no empty [dirreq-](read|write)-history lines are added
4444 to an extrainfo document. Implements ticket 2497.
4445 - When bandwidth accounting is enabled, be more generous with how
4446 much bandwidth we'll use up before entering "soft hibernation".
4447 Previously, we'd refuse new connections and circuits once we'd
4448 used up 95% of our allotment. Now, we use up 95% of our allotment,
4449 AND make sure that we have no more than 500MB (or 3 hours of
4450 expected traffic, whichever is lower) remaining before we enter
4452 - Relays now log the reason for publishing a new relay descriptor,
4453 so we have a better chance of hunting down instances of bug 1810.
4454 Resolves ticket 3252.
4455 - Log a little more clearly about the times at which we're no longer
4456 accepting new connections (e.g. due to hibernating). Resolves
4458 - When AllowSingleHopExits is set, print a warning to explain to the
4459 relay operator why most clients are avoiding her relay.
4460 - Send END_STREAM_REASON_NOROUTE in response to EHOSTUNREACH errors.
4461 Clients before 0.2.1.27 didn't handle NOROUTE correctly, but such
4462 clients are already deprecated because of security bugs.
4464 o Minor features (network statistics):
4465 - Directory mirrors that set "DirReqStatistics 1" write statistics
4466 about directory requests to disk every 24 hours. As compared to the
4467 "--enable-geoip-stats" ./configure flag in 0.2.1.x, there are a few
4468 improvements: 1) stats are written to disk exactly every 24 hours;
4469 2) estimated shares of v2 and v3 requests are determined as mean
4470 values, not at the end of a measurement period; 3) unresolved
4471 requests are listed with country code '??'; 4) directories also
4472 measure download times.
4473 - Exit nodes that set "ExitPortStatistics 1" write statistics on the
4474 number of exit streams and transferred bytes per port to disk every
4476 - Relays that set "CellStatistics 1" write statistics on how long
4477 cells spend in their circuit queues to disk every 24 hours.
4478 - Entry nodes that set "EntryStatistics 1" write statistics on the
4479 rough number and origins of connecting clients to disk every 24
4481 - Relays that write any of the above statistics to disk and set
4482 "ExtraInfoStatistics 1" include the past 24 hours of statistics in
4483 their extra-info documents. Implements proposal 166.
4485 o Minor features (GeoIP and statistics):
4486 - Provide a log message stating which geoip file we're parsing
4487 instead of just stating that we're parsing the geoip file.
4488 Implements ticket 2432.
4489 - Make sure every relay writes a state file at least every 12 hours.
4490 Previously, a relay could go for weeks without writing its state
4491 file, and on a crash could lose its bandwidth history, capacity
4492 estimates, client country statistics, and so on. Addresses bug 3012.
4493 - Relays report the number of bytes spent on answering directory
4494 requests in extra-info descriptors similar to {read,write}-history.
4495 Implements enhancement 1790.
4496 - Report only the top 10 ports in exit-port stats in order not to
4497 exceed the maximum extra-info descriptor length of 50 KB. Implements
4499 - If writing the state file to disk fails, wait up to an hour before
4500 retrying again, rather than trying again each second. Fixes bug
4501 2346; bugfix on Tor 0.1.1.3-alpha.
4502 - Delay geoip stats collection by bridges for 6 hours, not 2 hours,
4503 when we switch from being a public relay to a bridge. Otherwise
4504 there will still be clients that see the relay in their consensus,
4505 and the stats will end up wrong. Bugfix on 0.2.1.15-rc; fixes
4507 - Update to the August 2 2011 Maxmind GeoLite Country database.
4509 o Minor features (clients):
4510 - When expiring circuits, use microsecond timers rather than
4511 one-second timers. This can avoid an unpleasant situation where a
4512 circuit is launched near the end of one second and expired right
4513 near the beginning of the next, and prevent fluctuations in circuit
4515 - If we've configured EntryNodes and our network goes away and/or all
4516 our entrynodes get marked down, optimistically retry them all when
4517 a new socks application request appears. Fixes bug 1882.
4518 - Always perform router selections using weighted relay bandwidth,
4519 even if we don't need a high capacity circuit at the time. Non-fast
4520 circuits now only differ from fast ones in that they can use relays
4521 not marked with the Fast flag. This "feature" could turn out to
4522 be a horrible bug; we should investigate more before it goes into
4524 - When we run out of directory information such that we can't build
4525 circuits, but then get enough that we can build circuits, log when
4526 we actually construct a circuit, so the user has a better chance of
4527 knowing what's going on. Fixes bug 1362.
4528 - Log SSL state transitions at debug level during handshake, and
4529 include SSL states in error messages. This may help debug future
4530 SSL handshake issues.
4532 o Minor features (directory authorities):
4533 - When a router changes IP address or port, authorities now launch
4534 a new reachability test for it. Implements ticket 1899.
4535 - Directory authorities now reject relays running any versions of
4536 Tor between 0.2.1.3-alpha and 0.2.1.18 inclusive; they have
4537 known bugs that keep RELAY_EARLY cells from working on rendezvous
4538 circuits. Followup to fix for bug 2081.
4539 - Directory authorities now reject relays running any version of Tor
4540 older than 0.2.0.26-rc. That version is the earliest that fetches
4541 current directory information correctly. Fixes bug 2156.
4542 - Directory authorities now do an immediate reachability check as soon
4543 as they hear about a new relay. This change should slightly reduce
4544 the time between setting up a relay and getting listed as running
4545 in the consensus. It should also improve the time between setting
4546 up a bridge and seeing use by bridge users.
4547 - Directory authorities no longer launch a TLS connection to every
4548 relay as they startup. Now that we have 2k+ descriptors cached,
4549 the resulting network hiccup is becoming a burden. Besides,
4550 authorities already avoid voting about Running for the first half
4551 hour of their uptime.
4552 - Directory authorities now log the source of a rejected POSTed v3
4553 networkstatus vote, so we can track failures better.
4554 - Backport code from 0.2.3.x that allows directory authorities to
4555 clean their microdescriptor caches. Needed to resolve bug 2230.
4557 o Minor features (hidden services):
4558 - Use computed circuit-build timeouts to decide when to launch
4559 parallel introduction circuits for hidden services. (Previously,
4560 we would retry after 15 seconds.)
4561 - Don't allow v0 hidden service authorities to act as clients.
4562 Required by fix for bug 3000.
4563 - Ignore SIGNAL NEWNYM commands on relay-only Tor instances. Required
4564 by fix for bug 3000.
4565 - Make hidden services work better in private Tor networks by not
4566 requiring any uptime to join the hidden service descriptor
4567 DHT. Implements ticket 2088.
4568 - Log (at info level) when purging pieces of hidden-service-client
4569 state because of SIGNAL NEWNYM.
4571 o Minor features (controller interface):
4572 - New "GETINFO net/listeners/(type)" controller command to return
4573 a list of addresses and ports that are bound for listeners for a
4574 given connection type. This is useful when the user has configured
4575 "SocksPort auto" and the controller needs to know which port got
4576 chosen. Resolves another part of ticket 3076.
4577 - Have the controller interface give a more useful message than
4578 "Internal Error" in response to failed GETINFO requests.
4579 - Add a TIMEOUT_RATE keyword to the BUILDTIMEOUT_SET control port
4580 event, to give information on the current rate of circuit timeouts
4581 over our stored history.
4582 - The 'EXTENDCIRCUIT' control port command can now be used with
4583 a circ id of 0 and no path. This feature will cause Tor to build
4584 a new 'fast' general purpose circuit using its own path selection
4586 - Added a BUILDTIMEOUT_SET controller event to describe changes
4587 to the circuit build timeout.
4588 - New controller command "getinfo config-text". It returns the
4589 contents that Tor would write if you send it a SAVECONF command,
4590 so the controller can write the file to disk itself.
4592 o Minor features (controller protocol):
4593 - Add a new ControlSocketsGroupWritable configuration option: when
4594 it is turned on, ControlSockets are group-writeable by the default
4595 group of the current user. Patch by Jérémy Bobbio; implements
4597 - Tor now refuses to create a ControlSocket in a directory that is
4598 world-readable (or group-readable if ControlSocketsGroupWritable
4599 is 0). This is necessary because some operating systems do not
4600 enforce permissions on an AF_UNIX sockets. Permissions on the
4601 directory holding the socket, however, seems to work everywhere.
4602 - Warn when CookieAuthFileGroupReadable is set but CookieAuthFile is
4603 not. This would lead to a cookie that is still not group readable.
4604 Closes bug 1843. Suggested by katmagic.
4605 - Future-proof the controller protocol a bit by ignoring keyword
4606 arguments we do not recognize.
4608 o Minor features (more useful logging):
4609 - Revise most log messages that refer to nodes by nickname to
4610 instead use the "$key=nickname at address" format. This should be
4611 more useful, especially since nicknames are less and less likely
4612 to be unique. Resolves ticket 3045.
4613 - When an HTTPS proxy reports "403 Forbidden", we now explain
4614 what it means rather than calling it an unexpected status code.
4615 Closes bug 2503. Patch from Michael Yakubovich.
4616 - Rate-limit a warning about failures to download v2 networkstatus
4617 documents. Resolves part of bug 1352.
4618 - Rate-limit the "your application is giving Tor only an IP address"
4619 warning. Addresses bug 2000; bugfix on 0.0.8pre2.
4620 - Rate-limit "Failed to hand off onionskin" warnings.
4621 - When logging a rate-limited warning, we now mention how many messages
4622 got suppressed since the last warning.
4623 - Make the formerly ugly "2 unknown, 7 missing key, 0 good, 0 bad,
4624 2 no signature, 4 required" messages about consensus signatures
4625 easier to read, and make sure they get logged at the same severity
4626 as the messages explaining which keys are which. Fixes bug 1290.
4627 - Don't warn when we have a consensus that we can't verify because
4628 of missing certificates, unless those certificates are ones
4629 that we have been trying and failing to download. Fixes bug 1145.
4631 o Minor features (log domains):
4632 - Add documentation for configuring logging at different severities in
4633 different log domains. We've had this feature since 0.2.1.1-alpha,
4634 but for some reason it never made it into the manpage. Fixes
4636 - Make it simpler to specify "All log domains except for A and B".
4637 Previously you needed to say "[*,~A,~B]". Now you can just say
4639 - Add a "LogMessageDomains 1" option to include the domains of log
4640 messages along with the messages. Without this, there's no way
4641 to use log domains without reading the source or doing a lot
4643 - Add a new "Handshake" log domain for activities that happen
4644 during the TLS handshake.
4646 o Minor features (build process):
4647 - Make compilation with clang possible when using
4648 "--enable-gcc-warnings" by removing two warning options that clang
4649 hasn't implemented yet and by fixing a few warnings. Resolves
4651 - Detect platforms that brokenly use a signed size_t, and refuse to
4652 build there. Found and analyzed by doorss and rransom.
4653 - Fix a bunch of compile warnings revealed by mingw with gcc 4.5.
4655 - Add support for statically linking zlib by specifying
4656 "--enable-static-zlib", to go with our support for statically
4657 linking openssl and libevent. Resolves bug 1358.
4658 - Instead of adding the svn revision to the Tor version string, report
4659 the git commit (when we're building from a git checkout).
4660 - Rename the "log.h" header to "torlog.h" so as to conflict with fewer
4662 - New --digests command-line switch to output the digests of the
4663 source files Tor was built with.
4664 - Generate our manpage and HTML documentation using Asciidoc. This
4665 change should make it easier to maintain the documentation, and
4666 produce nicer HTML. The build process fails if asciidoc cannot
4667 be found and building with asciidoc isn't disabled (via the
4668 "--disable-asciidoc" argument to ./configure. Skipping the manpage
4669 speeds up the build considerably.
4671 o Minor features (options / torrc):
4672 - Warn when the same option is provided more than once in a torrc
4673 file, on the command line, or in a single SETCONF statement, and
4674 the option is one that only accepts a single line. Closes bug 1384.
4675 - Warn when the user configures two HiddenServiceDir lines that point
4676 to the same directory. Bugfix on 0.0.6 (the version introducing
4677 HiddenServiceDir); fixes bug 3289.
4678 - Add new "perconnbwrate" and "perconnbwburst" consensus params to
4679 do individual connection-level rate limiting of clients. The torrc
4680 config options with the same names trump the consensus params, if
4681 both are present. Replaces the old "bwconnrate" and "bwconnburst"
4682 consensus params which were broken from 0.2.2.7-alpha through
4683 0.2.2.14-alpha. Closes bug 1947.
4684 - New config option "WarnUnsafeSocks 0" disables the warning that
4685 occurs whenever Tor receives a socks handshake using a version of
4686 the socks protocol that can only provide an IP address (rather
4687 than a hostname). Setups that do DNS locally over Tor are fine,
4688 and we shouldn't spam the logs in that case.
4689 - New config option "CircuitStreamTimeout" to override our internal
4690 timeout schedule for how many seconds until we detach a stream from
4691 a circuit and try a new circuit. If your network is particularly
4692 slow, you might want to set this to a number like 60.
4693 - New options for SafeLogging to allow scrubbing only log messages
4694 generated while acting as a relay. Specify "SafeLogging relay" if
4695 you want to ensure that only messages known to originate from
4696 client use of the Tor process will be logged unsafely.
4697 - Time and memory units in the configuration file can now be set to
4698 fractional units. For example, "2.5 GB" is now a valid value for
4700 - Support line continuations in the torrc config file. If a line
4701 ends with a single backslash character, the newline is ignored, and
4702 the configuration value is treated as continuing on the next line.
4705 o Minor features (unit tests):
4706 - Revise our unit tests to use the "tinytest" framework, so we
4707 can run tests in their own processes, have smarter setup/teardown
4708 code, and so on. The unit test code has moved to its own
4709 subdirectory, and has been split into multiple modules.
4710 - Add a unit test for cross-platform directory-listing code.
4711 - Add some forgotten return value checks during unit tests. Found
4713 - Use GetTempDir to find the proper temporary directory location on
4714 Windows when generating temporary files for the unit tests. Patch
4717 o Minor features (misc):
4718 - The "torify" script now uses torsocks where available.
4719 - Make Libevent log messages get delivered to controllers later,
4720 and not from inside the Libevent log handler. This prevents unsafe
4721 reentrant Libevent calls while still letting the log messages
4723 - Certain Tor clients (such as those behind check.torproject.org) may
4724 want to fetch the consensus in an extra early manner. To enable this
4725 a user may now set FetchDirInfoExtraEarly to 1. This also depends on
4726 setting FetchDirInfoEarly to 1. Previous behavior will stay the same
4727 as only certain clients who must have this information sooner should
4729 - Expand homedirs passed to tor-checkkey. This should silence a
4730 coverity complaint about passing a user-supplied string into
4731 open() without checking it.
4732 - Make sure to disable DirPort if running as a bridge. DirPorts aren't
4733 used on bridges, and it makes bridge scanning somewhat easier.
4734 - Create the /var/run/tor directory on startup on OpenSUSE if it is
4735 not already created. Patch from Andreas Stieger. Fixes bug 2573.
4737 o Minor bugfixes (relays):
4738 - When a relay decides that its DNS is too broken for it to serve
4739 as an exit server, it advertised itself as a non-exit, but
4740 continued to act as an exit. This could create accidental
4741 partitioning opportunities for users. Instead, if a relay is
4742 going to advertise reject *:* as its exit policy, it should
4743 really act with exit policy "reject *:*". Fixes bug 2366.
4744 Bugfix on Tor 0.1.2.5-alpha. Bugfix by user "postman" on trac.
4745 - Publish a router descriptor even if generating an extra-info
4746 descriptor fails. Previously we would not publish a router
4747 descriptor without an extra-info descriptor; this can cause fast
4748 exit relays collecting exit-port statistics to drop from the
4749 consensus. Bugfix on 0.1.2.9-rc; fixes bug 2195.
4750 - When we're trying to guess whether we know our IP address as
4751 a relay, we would log various ways that we failed to guess
4752 our address, but never log that we ended up guessing it
4753 successfully. Now add a log line to help confused and anxious
4754 relay operators. Bugfix on 0.1.2.1-alpha; fixes bug 1534.
4755 - For bandwidth accounting, calculate our expected bandwidth rate
4756 based on the time during which we were active and not in
4757 soft-hibernation during the last interval. Previously, we were
4758 also considering the time spent in soft-hibernation. If this
4759 was a long time, we would wind up underestimating our bandwidth
4760 by a lot, and skewing our wakeup time towards the start of the
4761 accounting interval. Fixes bug 1789. Bugfix on 0.0.9pre5.
4762 - Demote a confusing TLS warning that relay operators might get when
4763 someone tries to talk to their ORPort. It is not the operator's
4764 fault, nor can they do anything about it. Fixes bug 1364; bugfix
4766 - Change "Application request when we're believed to be offline."
4767 notice to "Application request when we haven't used client
4768 functionality lately.", to clarify that it's not an error. Bugfix
4769 on 0.0.9.3; fixes bug 1222.
4771 o Minor bugfixes (bridges):
4772 - When a client starts or stops using bridges, never use a circuit
4773 that was built before the configuration change. This behavior could
4774 put at risk a user who uses bridges to ensure that her traffic
4775 only goes to the chosen addresses. Bugfix on 0.2.0.3-alpha; fixes
4777 - Do not reset the bridge descriptor download status every time we
4778 re-parse our configuration or get a configuration change. Fixes
4779 bug 3019; bugfix on 0.2.0.3-alpha.
4780 - Users couldn't configure a regular relay to be their bridge. It
4781 didn't work because when Tor fetched the bridge descriptor, it found
4782 that it already had it, and didn't realize that the purpose of the
4783 descriptor had changed. Now we replace routers with a purpose other
4784 than bridge with bridge descriptors when fetching them. Bugfix on
4785 0.1.1.9-alpha. Fixes bug 1776.
4786 - In the special case where you configure a public exit relay as your
4787 bridge, Tor would be willing to use that exit relay as the last
4788 hop in your circuit as well. Now we fail that circuit instead.
4789 Bugfix on 0.2.0.12-alpha. Fixes bug 2403. Reported by "piebeer".
4791 o Minor bugfixes (clients):
4792 - We now ask the other side of a stream (the client or the exit)
4793 for more data on that stream when the amount of queued data on
4794 that stream dips low enough. Previously, we wouldn't ask the
4795 other side for more data until either it sent us more data (which
4796 it wasn't supposed to do if it had exhausted its window!) or we
4797 had completely flushed all our queued data. This flow control fix
4798 should improve throughput. Fixes bug 2756; bugfix on the earliest
4799 released versions of Tor (svn commit r152).
4800 - When a client finds that an origin circuit has run out of 16-bit
4801 stream IDs, we now mark it as unusable for new streams. Previously,
4802 we would try to close the entire circuit. Bugfix on 0.0.6.
4803 - Make it explicit that we don't cannibalize one-hop circuits. This
4804 happens in the wild, but doesn't turn out to be a problem because
4805 we fortunately don't use those circuits. Many thanks to outofwords
4806 for the initial analysis and to swissknife who confirmed that
4807 two-hop circuits are actually created.
4808 - Resolve an edge case in path weighting that could make us misweight
4809 our relay selection. Fixes bug 1203; bugfix on 0.0.8rc1.
4810 - Make the DNSPort option work with libevent 2.x. Don't alter the
4811 behaviour for libevent 1.x. Fixes bug 1143. Found by SwissTorExit.
4813 o Minor bugfixes (directory authorities):
4814 - Make directory authorities more accurate at recording when
4815 relays that have failed several reachability tests became
4816 unreachable, so we can provide more accuracy at assigning Stable,
4817 Guard, HSDir, etc flags. Bugfix on 0.2.0.6-alpha. Resolves bug 2716.
4818 - Directory authorities are now more robust to hops back in time
4819 when calculating router stability. Previously, if a run of uptime
4820 or downtime appeared to be negative, the calculation could give
4821 incorrect results. Bugfix on 0.2.0.6-alpha; noticed when fixing
4823 - Directory authorities will now attempt to download consensuses
4824 if their own efforts to make a live consensus have failed. This
4825 change means authorities that restart will fetch a valid
4826 consensus, and it means authorities that didn't agree with the
4827 current consensus will still fetch and serve it if it has enough
4828 signatures. Bugfix on 0.2.0.9-alpha; fixes bug 1300.
4829 - Never vote for a server as "Running" if we have a descriptor for
4830 it claiming to be hibernating, and that descriptor was published
4831 more recently than our last contact with the server. Bugfix on
4832 0.2.0.3-alpha; fixes bug 911.
4833 - Directory authorities no longer change their opinion of, or vote on,
4834 whether a router is Running, unless they have themselves been
4835 online long enough to have some idea. Bugfix on 0.2.0.6-alpha.
4838 o Minor bugfixes (hidden services):
4839 - Log malformed requests for rendezvous descriptors as protocol
4840 warnings, not warnings. Also, use a more informative log message
4841 in case someone sees it at log level warning without prior
4842 info-level messages. Fixes bug 2748; bugfix on 0.2.0.10-alpha.
4843 - Accept hidden service descriptors if we think we might be a hidden
4844 service directory, regardless of what our consensus says. This
4845 helps robustness, since clients and hidden services can sometimes
4846 have a more up-to-date view of the network consensus than we do,
4847 and if they think that the directory authorities list us a HSDir,
4848 we might actually be one. Related to bug 2732; bugfix on
4850 - Correct the warning displayed when a rendezvous descriptor exceeds
4851 the maximum size. Fixes bug 2750; bugfix on 0.2.1.5-alpha. Found by
4853 - Clients and hidden services now use HSDir-flagged relays for hidden
4854 service descriptor downloads and uploads even if the relays have no
4855 DirPort set and the client has disabled TunnelDirConns. This will
4856 eventually allow us to give the HSDir flag to relays with no
4857 DirPort. Fixes bug 2722; bugfix on 0.2.1.6-alpha.
4858 - Only limit the lengths of single HS descriptors, even when multiple
4859 HS descriptors are published to an HSDir relay in a single POST
4860 operation. Fixes bug 2948; bugfix on 0.2.1.5-alpha. Found by hsdir.
4862 o Minor bugfixes (controllers):
4863 - Allow GETINFO fingerprint to return a fingerprint even when
4864 we have not yet built a router descriptor. Fixes bug 3577;
4865 bugfix on 0.2.0.1-alpha.
4866 - Send a SUCCEEDED stream event to the controller when a reverse
4867 resolve succeeded. Fixes bug 3536; bugfix on 0.0.8pre1. Issue
4868 discovered by katmagic.
4869 - Remove a trailing asterisk from "exit-policy/default" in the
4870 output of the control port command "GETINFO info/names". Bugfix
4872 - Make the SIGNAL DUMP controller command work on FreeBSD. Fixes bug
4873 2917. Bugfix on 0.1.1.1-alpha.
4874 - When we restart our relay, we might get a successful connection
4875 from the outside before we've started our reachability tests,
4876 triggering a warning: "ORPort found reachable, but I have no
4877 routerinfo yet. Failing to inform controller of success." This
4878 bug was harmless unless Tor is running under a controller
4879 like Vidalia, in which case the controller would never get a
4880 REACHABILITY_SUCCEEDED status event. Bugfix on 0.1.2.6-alpha;
4882 - When a controller changes TrackHostExits, remove mappings for
4883 hosts that should no longer have their exits tracked. Bugfix on
4885 - When a controller changes VirtualAddrNetwork, remove any mappings
4886 for hosts that were automapped to the old network. Bugfix on
4888 - When a controller changes one of the AutomapHosts* options, remove
4889 any mappings for hosts that should no longer be automapped. Bugfix
4891 - Fix an off-by-one error in calculating some controller command
4892 argument lengths. Fortunately, this mistake is harmless since
4893 the controller code does redundant NUL termination too. Found by
4894 boboper. Bugfix on 0.1.1.1-alpha.
4895 - Fix a bug in the controller interface where "GETINFO ns/asdaskljkl"
4896 would return "551 Internal error" rather than "552 Unrecognized key
4897 ns/asdaskljkl". Bugfix on 0.1.2.3-alpha.
4898 - Don't spam the controller with events when we have no file
4899 descriptors available. Bugfix on 0.2.1.5-alpha. (Rate-limiting
4900 for log messages was already solved from bug 748.)
4901 - Emit a GUARD DROPPED controller event for a case we missed.
4902 - Ensure DNS requests launched by "RESOLVE" commands from the
4903 controller respect the __LeaveStreamsUnattached setconf options. The
4904 same goes for requests launched via DNSPort or transparent
4905 proxying. Bugfix on 0.2.0.1-alpha; fixes bug 1525.
4907 o Minor bugfixes (config options):
4908 - Tor used to limit HttpProxyAuthenticator values to 48 characters.
4909 Change the limit to 512 characters by removing base64 newlines.
4910 Fixes bug 2752. Fix by Michael Yakubovich.
4911 - Complain if PublishServerDescriptor is given multiple arguments that
4912 include 0 or 1. This configuration will be rejected in the future.
4913 Bugfix on 0.2.0.1-alpha; closes bug 1107.
4914 - Disallow BridgeRelay 1 and ORPort 0 at once in the configuration.
4915 Bugfix on 0.2.0.13-alpha; closes bug 928.
4917 o Minor bugfixes (log subsystem fixes):
4918 - When unable to format an address as a string, report its value
4919 as "???" rather than reusing the last formatted address. Bugfix
4921 - Be more consistent in our treatment of file system paths. "~" should
4922 get expanded to the user's home directory in the Log config option.
4923 Fixes bug 2971; bugfix on 0.2.0.1-alpha, which introduced the
4924 feature for the -f and --DataDirectory options.
4926 o Minor bugfixes (memory management):
4927 - Don't stack-allocate the list of supplementary GIDs when we're
4928 about to log them. Stack-allocating NGROUPS_MAX gid_t elements
4929 could take up to 256K, which is way too much stack. Found by
4930 Coverity; CID #450. Bugfix on 0.2.1.7-alpha.
4931 - Save a couple bytes in memory allocation every time we escape
4932 certain characters in a string. Patch from Florian Zumbiehl.
4934 o Minor bugfixes (protocol correctness):
4935 - When checking for 1024-bit keys, check for 1024 bits, not 128
4936 bytes. This allows Tor to correctly discard keys of length 1017
4937 through 1023. Bugfix on 0.0.9pre5.
4938 - Require that introduction point keys and onion handshake keys
4939 have a public exponent of 65537. Starts to fix bug 3207; bugfix
4941 - Handle SOCKS messages longer than 128 bytes long correctly, rather
4942 than waiting forever for them to finish. Fixes bug 2330; bugfix
4943 on 0.2.0.16-alpha. Found by doorss.
4944 - Never relay a cell for a circuit we have already destroyed.
4945 Between marking a circuit as closeable and finally closing it,
4946 it may have been possible for a few queued cells to get relayed,
4947 even though they would have been immediately dropped by the next
4948 OR in the circuit. Fixes bug 1184; bugfix on 0.2.0.1-alpha.
4949 - Never queue a cell for a circuit that's already been marked
4951 - Fix a spec conformance issue: the network-status-version token
4952 must be the first token in a v3 consensus or vote. Discovered by
4953 "parakeep". Bugfix on 0.2.0.3-alpha.
4954 - A networkstatus vote must contain exactly one signature. Spec
4955 conformance issue. Bugfix on 0.2.0.3-alpha.
4956 - When asked about a DNS record type we don't support via a
4957 client DNSPort, reply with NOTIMPL rather than an empty
4958 reply. Patch by intrigeri. Fixes bug 3369; bugfix on 2.0.1-alpha.
4959 - Make more fields in the controller protocol case-insensitive, since
4960 control-spec.txt said they were.
4962 o Minor bugfixes (log messages):
4963 - Fix a log message that said "bits" while displaying a value in
4964 bytes. Found by wanoskarnet. Fixes bug 3318; bugfix on
4966 - Downgrade "no current certificates known for authority" message from
4967 Notice to Info. Fixes bug 2899; bugfix on 0.2.0.10-alpha.
4968 - Correctly describe errors that occur when generating a TLS object.
4969 Previously we would attribute them to a failure while generating a
4970 TLS context. Patch by Robert Ransom. Bugfix on 0.1.0.4-rc; fixes
4972 - Fix an instance where a Tor directory mirror might accidentally
4973 log the IP address of a misbehaving Tor client. Bugfix on
4975 - Stop logging at severity 'warn' when some other Tor client tries
4976 to establish a circuit with us using weak DH keys. It's a protocol
4977 violation, but that doesn't mean ordinary users need to hear about
4978 it. Fixes the bug part of bug 1114. Bugfix on 0.1.0.13.
4979 - If your relay can't keep up with the number of incoming create
4980 cells, it would log one warning per failure into your logs. Limit
4981 warnings to 1 per minute. Bugfix on 0.0.2pre10; fixes bug 1042.
4983 o Minor bugfixes (build fixes):
4984 - Fix warnings from GCC 4.6's "-Wunused-but-set-variable" option.
4985 - When warning about missing zlib development packages during compile,
4986 give the correct package names. Bugfix on 0.2.0.1-alpha.
4987 - Fix warnings that newer versions of autoconf produce during
4988 ./autogen.sh. These warnings appear to be harmless in our case,
4989 but they were extremely verbose. Fixes bug 2020.
4990 - Squash a compile warning on OpenBSD. Reported by Tas; fixes
4993 o Minor bugfixes (portability):
4994 - Write several files in text mode, on OSes that distinguish text
4995 mode from binary mode (namely, Windows). These files are:
4996 'buffer-stats', 'dirreq-stats', and 'entry-stats' on relays
4997 that collect those statistics; 'client_keys' and 'hostname' for
4998 hidden services that use authentication; and (in the tor-gencert
4999 utility) newly generated identity and signing keys. Previously,
5000 we wouldn't specify text mode or binary mode, leading to an
5001 assertion failure. Fixes bug 3607. Bugfix on 0.2.1.1-alpha (when
5002 the DirRecordUsageByCountry option which would have triggered
5003 the assertion failure was added), although this assertion failure
5004 would have occurred in tor-gencert on Windows in 0.2.0.1-alpha.
5005 - Selectively disable deprecation warnings on OS X because Lion
5006 started deprecating the shipped copy of openssl. Fixes bug 3643.
5007 - Use a wide type to hold sockets when built for 64-bit Windows.
5009 - Fix an issue that prevented static linking of libevent on
5010 some platforms (notably Linux). Fixes bug 2698; bugfix on 0.2.1.23,
5011 where we introduced the "--with-static-libevent" configure option.
5012 - Fix a bug with our locking implementation on Windows that couldn't
5013 correctly detect when a file was already locked. Fixes bug 2504,
5014 bugfix on 0.2.1.6-alpha.
5015 - Build correctly on OSX with zlib 1.2.4 and higher with all warnings
5017 - Fix IPv6-related connect() failures on some platforms (BSD, OS X).
5018 Bugfix on 0.2.0.3-alpha; fixes first part of bug 2660. Patch by
5021 o Minor bugfixes (code correctness):
5022 - Always NUL-terminate the sun_path field of a sockaddr_un before
5023 passing it to the kernel. (Not a security issue: kernels are
5024 smart enough to reject bad sockaddr_uns.) Found by Coverity;
5025 CID #428. Bugfix on Tor 0.2.0.3-alpha.
5026 - Make connection_printf_to_buf()'s behaviour sane. Its callers
5027 expect it to emit a CRLF iff the format string ends with CRLF;
5028 it actually emitted a CRLF iff (a) the format string ended with
5029 CRLF or (b) the resulting string was over 1023 characters long or
5030 (c) the format string did not end with CRLF *and* the resulting
5031 string was 1021 characters long or longer. Bugfix on 0.1.1.9-alpha;
5032 fixes part of bug 3407.
5033 - Make send_control_event_impl()'s behaviour sane. Its callers
5034 expect it to always emit a CRLF at the end of the string; it
5035 might have emitted extra control characters as well. Bugfix on
5036 0.1.1.9-alpha; fixes another part of bug 3407.
5037 - Make crypto_rand_int() check the value of its input correctly.
5038 Previously, it accepted values up to UINT_MAX, but could return a
5039 negative number if given a value above INT_MAX+1. Found by George
5040 Kadianakis. Fixes bug 3306; bugfix on 0.2.2pre14.
5041 - Fix a potential null-pointer dereference while computing a
5042 consensus. Bugfix on tor-0.2.0.3-alpha, found with the help of
5044 - If we fail to compute the identity digest of a v3 legacy keypair,
5045 warn, and don't use a buffer-full of junk instead. Bugfix on
5046 0.2.1.1-alpha; fixes bug 3106.
5047 - Resolve an untriggerable issue in smartlist_string_num_isin(),
5048 where if the function had ever in the future been used to check
5049 for the presence of a too-large number, it would have given an
5050 incorrect result. (Fortunately, we only used it for 16-bit
5051 values.) Fixes bug 3175; bugfix on 0.1.0.1-rc.
5052 - Be more careful about reporting the correct error from a failed
5053 connect() system call. Under some circumstances, it was possible to
5054 look at an incorrect value for errno when sending the end reason.
5055 Bugfix on 0.1.0.1-rc.
5056 - Correctly handle an "impossible" overflow cases in connection byte
5057 counting, where we write or read more than 4GB on an edge connection
5058 in a single second. Bugfix on 0.1.2.8-beta.
5059 - Avoid a double mark-for-free warning when failing to attach a
5060 transparent proxy connection. Bugfix on 0.1.2.1-alpha. Fixes
5062 - Correctly detect failure to allocate an OpenSSL BIO. Fixes bug 2378;
5063 found by "cypherpunks". This bug was introduced before the first
5064 Tor release, in svn commit r110.
5065 - Fix a bug in bandwidth history state parsing that could have been
5066 triggered if a future version of Tor ever changed the timing
5067 granularity at which bandwidth history is measured. Bugfix on
5069 - Add assertions to check for overflow in arguments to
5070 base32_encode() and base32_decode(); fix a signed-unsigned
5071 comparison there too. These bugs are not actually reachable in Tor,
5072 but it's good to prevent future errors too. Found by doorss.
5073 - Avoid a bogus overlapped memcpy in tor_addr_copy(). Reported by
5075 - Set target port in get_interface_address6() correctly. Bugfix
5076 on 0.1.1.4-alpha and 0.2.0.3-alpha; fixes second part of bug 2660.
5077 - Fix an impossible-to-actually-trigger buffer overflow in relay
5078 descriptor generation. Bugfix on 0.1.0.15.
5079 - Fix numerous small code-flaws found by Coverity Scan Rung 3.
5081 o Minor bugfixes (code improvements):
5082 - After we free an internal connection structure, overwrite it
5083 with a different memory value than we use for overwriting a freed
5084 internal circuit structure. Should help with debugging. Suggested
5086 - If OpenSSL fails to make a duplicate of a private or public key, log
5087 an error message and try to exit cleanly. May help with debugging
5088 if bug 1209 ever remanifests.
5089 - Some options used different conventions for uppercasing of acronyms
5090 when comparing manpage and source. Fix those in favor of the
5091 manpage, as it makes sense to capitalize acronyms.
5092 - Take a first step towards making or.h smaller by splitting out
5093 function definitions for all source files in src/or/. Leave
5094 structures and defines in or.h for now.
5095 - Remove a few dead assignments during router parsing. Found by
5097 - Don't use 1-bit wide signed bit fields. Found by coverity.
5098 - Avoid signed/unsigned comparisons by making SIZE_T_CEILING unsigned.
5099 None of the cases where we did this before were wrong, but by making
5100 this change we avoid warnings. Fixes bug 2475; bugfix on 0.2.1.28.
5101 - The memarea code now uses a sentinel value at the end of each area
5102 to make sure nothing writes beyond the end of an area. This might
5103 help debug some conceivable causes of bug 930.
5104 - Always treat failure to allocate an RSA key as an unrecoverable
5106 - Add some more defensive programming for architectures that can't
5107 handle unaligned integer accesses. We don't know of any actual bugs
5108 right now, but that's the best time to fix them. Fixes bug 1943.
5110 o Minor bugfixes (misc):
5111 - Fix a rare bug in rend_fn unit tests: we would fail a test when
5112 a randomly generated port is 0. Diagnosed by Matt Edman. Bugfix
5113 on 0.2.0.10-alpha; fixes bug 1808.
5114 - Where available, use Libevent 2.0's periodic timers so that our
5115 once-per-second cleanup code gets called even more closely to
5116 once per second than it would otherwise. Fixes bug 943.
5117 - Ignore OutboundBindAddress when connecting to localhost.
5118 Connections to localhost need to come _from_ localhost, or else
5119 local servers (like DNS and outgoing HTTP/SOCKS proxies) will often
5121 - Update our OpenSSL 0.9.8l fix so that it works with OpenSSL 0.9.8m
5123 - If any of the v3 certs we download are unparseable, we should
5124 actually notice the failure so we don't retry indefinitely. Bugfix
5125 on 0.2.0.x; reported by "rotator".
5126 - When Tor fails to parse a descriptor of any kind, dump it to disk.
5127 Might help diagnosing bug 1051.
5128 - Make our 'torify' script more portable; if we have only one of
5129 'torsocks' or 'tsocks' installed, don't complain to the user;
5130 and explain our warning about tsocks better.
5131 - Fix some urls in the exit notice file and make it XHTML1.1 strict
5132 compliant. Based on a patch from Christian Kujau.
5134 o Documentation changes:
5135 - Modernize the doxygen configuration file slightly. Fixes bug 2707.
5136 - Resolve all doxygen warnings except those for missing documentation.
5138 - Add doxygen documentation for more functions, fields, and types.
5139 - Convert the HACKING file to asciidoc, and add a few new sections
5140 to it, explaining how we use Git, how we make changelogs, and
5141 what should go in a patch.
5142 - Document the default socks host and port (127.0.0.1:9050) for
5144 - Removed some unnecessary files from the source distribution. The
5145 AUTHORS file has now been merged into the people page on the
5146 website. The roadmaps and design doc can now be found in the
5147 projects directory in svn.
5149 o Deprecated and removed features (config):
5150 - Remove the torrc.complete file. It hasn't been kept up to date
5151 and users will have better luck checking out the manpage.
5152 - Remove the HSAuthorityRecordStats option that version 0 hidden
5153 service authorities could use to track statistics of overall v0
5154 hidden service usage.
5155 - Remove the obsolete "NoPublish" option; it has been flagged
5156 as obsolete and has produced a warning since 0.1.1.18-rc.
5157 - Caches no longer download and serve v2 networkstatus documents
5158 unless FetchV2Networkstatus flag is set: these documents haven't
5159 haven't been used by clients or relays since 0.2.0.x. Resolves
5162 o Deprecated and removed features (controller):
5163 - The controller no longer accepts the old obsolete "addr-mappings/"
5164 or "unregistered-servers-" GETINFO values.
5165 - The EXTENDED_EVENTS and VERBOSE_NAMES controller features are now
5166 always on; using them is necessary for correct forward-compatible
5169 o Deprecated and removed features (misc):
5170 - Hidden services no longer publish version 0 descriptors, and clients
5171 do not request or use version 0 descriptors. However, the old hidden
5172 service authorities still accept and serve version 0 descriptors
5173 when contacted by older hidden services/clients.
5174 - Remove undocumented option "-F" from tor-resolve: it hasn't done
5175 anything since 0.2.1.16-rc.
5176 - Remove everything related to building the expert bundle for OS X.
5177 It has confused many users, doesn't work right on OS X 10.6,
5178 and is hard to get rid of once installed. Resolves bug 1274.
5179 - Remove support for .noconnect style addresses. Nobody was using
5180 them, and they provided another avenue for detecting Tor users
5181 via application-level web tricks.
5182 - When we fixed bug 1038 we had to put in a restriction not to send
5183 RELAY_EARLY cells on rend circuits. This was necessary as long
5184 as relays using Tor 0.2.1.3-alpha through 0.2.1.18-alpha were
5185 active. Now remove this obsolete check. Resolves bug 2081.
5186 - Remove workaround code to handle directory responses from servers
5187 that had bug 539 (they would send HTTP status 503 responses _and_
5188 send a body too). Since only server versions before
5189 0.2.0.16-alpha/0.1.2.19 were affected, there is no longer reason to
5190 keep the workaround in place.
5191 - Remove the old 'fuzzy time' logic. It was supposed to be used for
5192 handling calculations where we have a known amount of clock skew and
5193 an allowed amount of unknown skew. But we only used it in three
5194 places, and we never adjusted the known/unknown skew values. This is
5195 still something we might want to do someday, but if we do, we'll
5196 want to do it differently.
5197 - Remove the "--enable-iphone" option to ./configure. According to
5198 reports from Marco Bonetti, Tor builds fine without any special
5199 tweaking on recent iPhone SDK versions.
5202 Changes in version 0.2.1.30 - 2011-02-23
5203 Tor 0.2.1.30 fixes a variety of less critical bugs. The main other
5204 change is a slight tweak to Tor's TLS handshake that makes relays
5205 and bridges that run this new version reachable from Iran again.
5206 We don't expect this tweak will win the arms race long-term, but it
5207 buys us time until we roll out a better solution.
5210 - Stop sending a CLOCK_SKEW controller status event whenever
5211 we fetch directory information from a relay that has a wrong clock.
5212 Instead, only inform the controller when it's a trusted authority
5213 that claims our clock is wrong. Bugfix on 0.1.2.6-alpha; fixes
5214 the rest of bug 1074.
5215 - Fix a bounds-checking error that could allow an attacker to
5216 remotely crash a directory authority. Bugfix on 0.2.1.5-alpha.
5218 - If relays set RelayBandwidthBurst but not RelayBandwidthRate,
5219 Tor would ignore their RelayBandwidthBurst setting,
5220 potentially using more bandwidth than expected. Bugfix on
5221 0.2.0.1-alpha. Reported by Paul Wouters. Fixes bug 2470.
5222 - Ignore and warn if the user mistakenly sets "PublishServerDescriptor
5223 hidserv" in her torrc. The 'hidserv' argument never controlled
5224 publication of hidden service descriptors. Bugfix on 0.2.0.1-alpha.
5227 - Adjust our TLS Diffie-Hellman parameters to match those used by
5229 - Update to the February 1 2011 Maxmind GeoLite Country database.
5232 - Check for and reject overly long directory certificates and
5233 directory tokens before they have a chance to hit any assertions.
5234 Bugfix on 0.2.1.28. Found by "doorss".
5235 - Bring the logic that gathers routerinfos and assesses the
5236 acceptability of circuits into line. This prevents a Tor OP from
5237 getting locked in a cycle of choosing its local OR as an exit for a
5238 path (due to a .exit request) and then rejecting the circuit because
5239 its OR is not listed yet. It also prevents Tor clients from using an
5240 OR running in the same instance as an exit (due to a .exit request)
5241 if the OR does not meet the same requirements expected of an OR
5242 running elsewhere. Fixes bug 1859; bugfix on 0.1.0.1-rc.
5244 o Packaging changes:
5245 - Stop shipping the Tor specs files and development proposal documents
5246 in the tarball. They are now in a separate git repository at
5247 git://git.torproject.org/torspec.git
5248 - Do not include Git version tags as though they are SVN tags when
5249 generating a tarball from inside a repository that has switched
5250 between branches. Bugfix on 0.2.1.15-rc; fixes bug 2402.
5253 Changes in version 0.2.1.29 - 2011-01-15
5254 Tor 0.2.1.29 continues our recent code security audit work. The main
5255 fix resolves a remote heap overflow vulnerability that can allow remote
5256 code execution. Other fixes address a variety of assert and crash bugs,
5257 most of which we think are hard to exploit remotely.
5259 o Major bugfixes (security):
5260 - Fix a heap overflow bug where an adversary could cause heap
5261 corruption. This bug probably allows remote code execution
5262 attacks. Reported by "debuger". Fixes CVE-2011-0427. Bugfix on
5264 - Prevent a denial-of-service attack by disallowing any
5265 zlib-compressed data whose compression factor is implausibly
5266 high. Fixes part of bug 2324; reported by "doorss".
5267 - Zero out a few more keys in memory before freeing them. Fixes
5268 bug 2384 and part of bug 2385. These key instances found by
5269 "cypherpunks", based on Andrew Case's report about being able
5270 to find sensitive data in Tor's memory space if you have enough
5271 permissions. Bugfix on 0.0.2pre9.
5273 o Major bugfixes (crashes):
5274 - Prevent calls to Libevent from inside Libevent log handlers.
5275 This had potential to cause a nasty set of crashes, especially
5276 if running Libevent with debug logging enabled, and running
5277 Tor with a controller watching for low-severity log messages.
5278 Bugfix on 0.1.0.2-rc. Fixes bug 2190.
5279 - Add a check for SIZE_T_MAX to tor_realloc() to try to avoid
5280 underflow errors there too. Fixes the other part of bug 2324.
5281 - Fix a bug where we would assert if we ever had a
5282 cached-descriptors.new file (or another file read directly into
5283 memory) of exactly SIZE_T_CEILING bytes. Fixes bug 2326; bugfix
5284 on 0.2.1.25. Found by doorss.
5285 - Fix some potential asserts and parsing issues with grossly
5286 malformed router caches. Fixes bug 2352; bugfix on Tor 0.2.1.27.
5289 o Minor bugfixes (other):
5290 - Fix a bug with handling misformed replies to reverse DNS lookup
5291 requests in DNSPort. Bugfix on Tor 0.2.0.1-alpha. Related to a
5292 bug reported by doorss.
5293 - Fix compilation on mingw when a pthreads compatibility library
5294 has been installed. (We don't want to use it, so we shouldn't
5295 be including pthread.h.) Fixes bug 2313; bugfix on 0.1.0.1-rc.
5296 - Fix a bug where we would declare that we had run out of virtual
5297 addresses when the address space was only half-exhausted. Bugfix
5299 - Correctly handle the case where AutomapHostsOnResolve is set but
5300 no virtual addresses are available. Fixes bug 2328; bugfix on
5301 0.1.2.1-alpha. Bug found by doorss.
5302 - Correctly handle wrapping around when we run out of virtual
5303 address space. Found by cypherpunks; bugfix on 0.2.0.5-alpha.
5306 - Update to the January 1 2011 Maxmind GeoLite Country database.
5307 - Introduce output size checks on all of our decryption functions.
5310 - Tor does not build packages correctly with Automake 1.6 and earlier;
5311 added a check to Makefile.am to make sure that we're building with
5312 Automake 1.7 or later.
5313 - The 0.2.1.28 tarball was missing src/common/OpenBSD_malloc_Linux.c
5314 because we built it with a too-old version of automake. Thus that
5315 release broke ./configure --enable-openbsd-malloc, which is popular
5316 among really fast exit relays on Linux.
5319 Changes in version 0.2.1.28 - 2010-12-17
5320 Tor 0.2.1.28 does some code cleanup to reduce the risk of remotely
5321 exploitable bugs. We also took this opportunity to change the IP address
5322 for one of our directory authorities, and to update the geoip database
5326 - Fix a remotely exploitable bug that could be used to crash instances
5327 of Tor remotely by overflowing on the heap. Remote-code execution
5328 hasn't been confirmed, but can't be ruled out. Everyone should
5329 upgrade. Bugfix on the 0.1.1 series and later.
5331 o Directory authority changes:
5332 - Change IP address and ports for gabelmoo (v3 directory authority).
5335 - Update to the December 1 2010 Maxmind GeoLite Country database.
5338 Changes in version 0.2.1.27 - 2010-11-23
5339 Yet another OpenSSL security patch broke its compatibility with Tor:
5340 Tor 0.2.1.27 makes relays work with openssl 0.9.8p and 1.0.0.b. We
5341 also took this opportunity to fix several crash bugs, integrate a new
5342 directory authority, and update the bundled GeoIP database.
5345 - Resolve an incompatibility with OpenSSL 0.9.8p and OpenSSL 1.0.0b:
5346 No longer set the tlsext_host_name extension on server SSL objects;
5347 but continue to set it on client SSL objects. Our goal in setting
5348 it was to imitate a browser, not a vhosting server. Fixes bug 2204;
5349 bugfix on 0.2.1.1-alpha.
5350 - Do not log messages to the controller while shrinking buffer
5351 freelists. Doing so would sometimes make the controller connection
5352 try to allocate a buffer chunk, which would mess up the internals
5353 of the freelist and cause an assertion failure. Fixes bug 1125;
5354 fixed by Robert Ransom. Bugfix on 0.2.0.16-alpha.
5355 - Learn our external IP address when we're a relay or bridge, even if
5356 we set PublishServerDescriptor to 0. Bugfix on 0.2.0.3-alpha,
5357 where we introduced bridge relays that don't need to publish to
5358 be useful. Fixes bug 2050.
5359 - Do even more to reject (and not just ignore) annotations on
5360 router descriptors received anywhere but from the cache. Previously
5361 we would ignore such annotations at first, but cache them to disk
5362 anyway. Bugfix on 0.2.0.8-alpha. Found by piebeer.
5363 - When you're using bridges and your network goes away and your
5364 bridges get marked as down, recover when you attempt a new socks
5365 connection (if the network is back), rather than waiting up to an
5366 hour to try fetching new descriptors for your bridges. Bugfix on
5367 0.2.0.3-alpha; fixes bug 1981.
5370 - Move to the November 2010 Maxmind GeoLite country db (rather
5371 than the June 2009 ip-to-country GeoIP db) for our statistics that
5372 count how many users relays are seeing from each country. Now we'll
5373 have more accurate data, especially for many African countries.
5375 o New directory authorities:
5376 - Set up maatuska (run by Linus Nordberg) as the eighth v3 directory
5380 - Fix an assertion failure that could occur in directory caches or
5381 bridge users when using a very short voting interval on a testing
5382 network. Diagnosed by Robert Hogan. Fixes bug 1141; bugfix on
5384 - Enforce multiplicity rules when parsing annotations. Bugfix on
5385 0.2.0.8-alpha. Found by piebeer.
5386 - Allow handshaking OR connections to take a full KeepalivePeriod
5387 seconds to handshake. Previously, we would close them after
5388 IDLE_OR_CONN_TIMEOUT (180) seconds, the same timeout as if they
5389 were open. Bugfix on 0.2.1.26; fixes bug 1840. Thanks to mingw-san
5391 - When building with --enable-gcc-warnings on OpenBSD, disable
5392 warnings in system headers. This makes --enable-gcc-warnings
5393 pass on OpenBSD 4.8.
5396 - Exit nodes didn't recognize EHOSTUNREACH as a plausible error code,
5397 and so sent back END_STREAM_REASON_MISC. Clients now recognize a new
5398 stream ending reason for this case: END_STREAM_REASON_NOROUTE.
5399 Servers can start sending this code when enough clients recognize
5400 it. Bugfix on 0.1.0.1-rc; fixes part of bug 1793.
5401 - Build correctly on mingw with more recent versions of OpenSSL 0.9.8.
5402 Patch from mingw-san.
5405 - Remove the old debian/ directory from the main Tor distribution.
5406 The official Tor-for-debian git repository lives at the URL
5407 https://git.torproject.org/debian/tor.git
5408 - Stop shipping the old doc/website/ directory in the tarball. We
5409 changed the website format in late 2010, and what we shipped in
5410 0.2.1.26 really wasn't that useful anyway.
5413 Changes in version 0.2.1.26 - 2010-05-02
5414 Tor 0.2.1.26 addresses the recent connection and memory overload
5415 problems we've been seeing on relays, especially relays with their
5416 DirPort open. If your relay has been crashing, or you turned it off
5417 because it used too many resources, give this release a try.
5419 This release also fixes yet another instance of broken OpenSSL libraries
5420 that was causing some relays to drop out of the consensus.
5423 - Teach relays to defend themselves from connection overload. Relays
5424 now close idle circuits early if it looks like they were intended
5425 for directory fetches. Relays are also more aggressive about closing
5426 TLS connections that have no circuits on them. Such circuits are
5427 unlikely to be re-used, and tens of thousands of them were piling
5428 up at the fast relays, causing the relays to run out of sockets
5429 and memory. Bugfix on 0.2.0.22-rc (where clients started tunneling
5430 their directory fetches over TLS).
5431 - Fix SSL renegotiation behavior on OpenSSL versions like on Centos
5432 that claim to be earlier than 0.9.8m, but which have in reality
5433 backported huge swaths of 0.9.8m or 0.9.8n renegotiation
5434 behavior. Possible fix for some cases of bug 1346.
5435 - Directory mirrors were fetching relay descriptors only from v2
5436 directory authorities, rather than v3 authorities like they should.
5437 Only 2 v2 authorities remain (compared to 7 v3 authorities), leading
5438 to a serious bottleneck. Bugfix on 0.2.0.9-alpha. Fixes bug 1324.
5441 - Finally get rid of the deprecated and now harmful notion of "clique
5442 mode", where directory authorities maintain TLS connections to
5446 - In the util/threads test, no longer free the test_mutex before all
5447 worker threads have finished. Bugfix on 0.2.1.6-alpha.
5448 - The master thread could starve the worker threads quite badly on
5449 certain systems, causing them to run only partially in the allowed
5450 window. This resulted in test failures. Now the master thread sleeps
5451 occasionally for a few microseconds while the two worker-threads
5452 compete for the mutex. Bugfix on 0.2.0.1-alpha.
5455 Changes in version 0.2.1.25 - 2010-03-16
5456 Tor 0.2.1.25 fixes a regression introduced in 0.2.1.23 that could
5457 prevent relays from guessing their IP address correctly. It also fixes
5458 several minor potential security bugs.
5461 - Fix a regression from our patch for bug 1244 that caused relays
5462 to guess their IP address incorrectly if they didn't set Address
5463 in their torrc and/or their address fails to resolve. Bugfix on
5464 0.2.1.23; fixes bug 1269.
5465 - When freeing a session key, zero it out completely. We only zeroed
5466 the first ptrsize bytes. Bugfix on 0.0.2pre8. Discovered and
5467 patched by ekir. Fixes bug 1254.
5470 - Fix a dereference-then-NULL-check sequence when publishing
5471 descriptors. Bugfix on 0.2.1.5-alpha. Discovered by ekir; fixes
5473 - Fix another dereference-then-NULL-check sequence. Bugfix on
5474 0.2.1.14-rc. Discovered by ekir; fixes bug 1256.
5475 - Make sure we treat potentially not NUL-terminated strings correctly.
5476 Bugfix on 0.1.1.13-alpha. Discovered by rieo; fixes bug 1257.
5479 Changes in version 0.2.1.24 - 2010-02-21
5480 Tor 0.2.1.24 makes Tor work again on the latest OS X -- this time
5484 - Work correctly out-of-the-box with even more vendor-patched versions
5485 of OpenSSL. In particular, make it so Debian and OS X don't need
5486 customized patches to run/build.
5489 Changes in version 0.2.1.23 - 2010-02-13
5490 Tor 0.2.1.23 fixes a huge client-side performance bug, makes Tor work
5491 again on the latest OS X, and updates the location of a directory
5494 o Major bugfixes (performance):
5495 - We were selecting our guards uniformly at random, and then weighting
5496 which of our guards we'd use uniformly at random. This imbalance
5497 meant that Tor clients were severely limited on throughput (and
5498 probably latency too) by the first hop in their circuit. Now we
5499 select guards weighted by currently advertised bandwidth. We also
5500 automatically discard guards picked using the old algorithm. Fixes
5501 bug 1217; bugfix on 0.2.1.3-alpha. Found by Mike Perry.
5504 - Make Tor work again on the latest OS X: when deciding whether to
5505 use strange flags to turn TLS renegotiation on, detect the OpenSSL
5506 version at run-time, not compile time. We need to do this because
5507 Apple doesn't update its dev-tools headers when it updates its
5508 libraries in a security patch.
5509 - Fix a potential buffer overflow in lookup_last_hid_serv_request()
5510 that could happen on 32-bit platforms with 64-bit time_t. Also fix
5511 a memory leak when requesting a hidden service descriptor we've
5512 requested before. Fixes bug 1242, bugfix on 0.2.0.18-alpha. Found
5516 - Refactor resolve_my_address() to not use gethostbyname() anymore.
5517 Fixes bug 1244; bugfix on 0.0.2pre25. Reported by Mike Mestnik.
5520 - Avoid a mad rush at the beginning of each month when each client
5521 rotates half of its guards. Instead we spread the rotation out
5522 throughout the month, but we still avoid leaving a precise timestamp
5523 in the state file about when we first picked the guard. Improves
5524 over the behavior introduced in 0.1.2.17.
5527 Changes in version 0.2.1.22 - 2010-01-19
5528 Tor 0.2.1.22 fixes a critical privacy problem in bridge directory
5529 authorities -- it would tell you its whole history of bridge descriptors
5530 if you make the right directory request. This stable update also
5531 rotates two of the seven v3 directory authority keys and locations.
5533 o Directory authority changes:
5534 - Rotate keys (both v3 identity and relay identity) for moria1
5538 - Stop bridge directory authorities from answering dbg-stability.txt
5539 directory queries, which would let people fetch a list of all
5540 bridge identities they track. Bugfix on 0.2.1.6-alpha.
5543 Changes in version 0.2.1.21 - 2009-12-21
5544 Tor 0.2.1.21 fixes an incompatibility with the most recent OpenSSL
5545 library. If you use Tor on Linux / Unix and you're getting SSL
5546 renegotiation errors, upgrading should help. We also recommend an
5547 upgrade if you're an exit relay.
5550 - Work around a security feature in OpenSSL 0.9.8l that prevents our
5551 handshake from working unless we explicitly tell OpenSSL that we
5552 are using SSL renegotiation safely. We are, of course, but OpenSSL
5553 0.9.8l won't work unless we say we are.
5554 - Avoid crashing if the client is trying to upload many bytes and the
5555 circuit gets torn down at the same time, or if the flip side
5556 happens on the exit relay. Bugfix on 0.2.0.1-alpha; fixes bug 1150.
5559 - Do not refuse to learn about authority certs and v2 networkstatus
5560 documents that are older than the latest consensus. This bug might
5561 have degraded client bootstrapping. Bugfix on 0.2.0.10-alpha.
5562 Spotted and fixed by xmux.
5563 - Fix a couple of very-hard-to-trigger memory leaks, and one hard-to-
5564 trigger platform-specific option misparsing case found by Coverity
5566 - Fix a compilation warning on Fedora 12 by removing an impossible-to-
5567 trigger assert. Fixes bug 1173.
5570 Changes in version 0.2.1.20 - 2009-10-15
5571 Tor 0.2.1.20 fixes a crash bug when you're accessing many hidden
5572 services at once, prepares for more performance improvements, and
5573 fixes a bunch of smaller bugs.
5575 The Windows and OS X bundles also include a more recent Vidalia,
5576 and switch from Privoxy to Polipo.
5578 The OS X installers are now drag and drop. It's best to un-install
5579 Tor/Vidalia and then install this new bundle, rather than upgrade. If
5580 you want to upgrade, you'll need to update the paths for Tor and Polipo
5581 in the Vidalia Settings window.
5584 - Send circuit or stream sendme cells when our window has decreased
5585 by 100 cells, not when it has decreased by 101 cells. Bug uncovered
5586 by Karsten when testing the "reduce circuit window" performance
5587 patch. Bugfix on the 54th commit on Tor -- from July 2002,
5588 before the release of Tor 0.0.0. This is the new winner of the
5590 - Fix a remotely triggerable memory leak when a consensus document
5591 contains more than one signature from the same voter. Bugfix on
5593 - Avoid segfault in rare cases when finishing an introduction circuit
5594 as a client and finding out that we don't have an introduction key
5595 for it. Fixes bug 1073. Reported by Aaron Swartz.
5598 - Tor now reads the "circwindow" parameter out of the consensus,
5599 and uses that value for its circuit package window rather than the
5600 default of 1000 cells. Begins the implementation of proposal 168.
5602 o New directory authorities:
5603 - Set up urras (run by Jacob Appelbaum) as the seventh v3 directory
5605 - Move moria1 and tonga to alternate IP addresses.
5608 - Fix a signed/unsigned compile warning in 0.2.1.19.
5609 - Fix possible segmentation fault on directory authorities. Bugfix on
5611 - Fix an extremely rare infinite recursion bug that could occur if
5612 we tried to log a message after shutting down the log subsystem.
5613 Found by Matt Edman. Bugfix on 0.2.0.16-alpha.
5614 - Fix an obscure bug where hidden services on 64-bit big-endian
5615 systems might mis-read the timestamp in v3 introduce cells, and
5616 refuse to connect back to the client. Discovered by "rotor".
5617 Bugfix on 0.2.1.6-alpha.
5618 - We were triggering a CLOCK_SKEW controller status event whenever
5619 we connect via the v2 connection protocol to any relay that has
5620 a wrong clock. Instead, we should only inform the controller when
5621 it's a trusted authority that claims our clock is wrong. Bugfix
5622 on 0.2.0.20-rc; starts to fix bug 1074. Reported by SwissTorExit.
5623 - We were telling the controller about CHECKING_REACHABILITY and
5624 REACHABILITY_FAILED status events whenever we launch a testing
5625 circuit or notice that one has failed. Instead, only tell the
5626 controller when we want to inform the user of overall success or
5627 overall failure. Bugfix on 0.1.2.6-alpha. Fixes bug 1075. Reported
5629 - Don't warn when we're using a circuit that ends with a node
5630 excluded in ExcludeExitNodes, but the circuit is not used to access
5631 the outside world. This should help fix bug 1090. Bugfix on
5633 - Work around a small memory leak in some versions of OpenSSL that
5634 stopped the memory used by the hostname TLS extension from being
5638 - Add a "getinfo status/accepted-server-descriptor" controller
5639 command, which is the recommended way for controllers to learn
5640 whether our server descriptor has been successfully received by at
5641 least on directory authority. Un-recommend good-server-descriptor
5642 getinfo and status events until we have a better design for them.
5645 Changes in version 0.2.1.19 - 2009-07-28
5646 Tor 0.2.1.19 fixes a major bug with accessing and providing hidden
5650 - Make accessing hidden services on 0.2.1.x work right again.
5651 Bugfix on 0.2.1.3-alpha; workaround for bug 1038. Diagnosis and
5652 part of patch provided by "optimist".
5655 - When a relay/bridge is writing out its identity key fingerprint to
5656 the "fingerprint" file and to its logs, write it without spaces. Now
5657 it will look like the fingerprints in our bridges documentation,
5658 and confuse fewer users.
5661 - Relays no longer publish a new server descriptor if they change
5662 their MaxAdvertisedBandwidth config option but it doesn't end up
5663 changing their advertised bandwidth numbers. Bugfix on 0.2.0.28-rc;
5664 fixes bug 1026. Patch from Sebastian.
5665 - Avoid leaking memory every time we get a create cell but we have
5666 so many already queued that we refuse it. Bugfix on 0.2.0.19-alpha;
5667 fixes bug 1034. Reported by BarkerJr.
5670 Changes in version 0.2.1.18 - 2009-07-24
5671 Tor 0.2.1.18 lays the foundations for performance improvements,
5672 adds status events to help users diagnose bootstrap problems, adds
5673 optional authentication/authorization for hidden services, fixes a
5674 variety of potential anonymity problems, and includes a huge pile of
5675 other features and bug fixes.
5677 o Major features (clients):
5678 - Start sending "bootstrap phase" status events to the controller,
5679 so it can keep the user informed of progress fetching directory
5680 information and establishing circuits. Also inform the controller
5681 if we think we're stuck at a particular bootstrap phase. Implements
5683 - Clients replace entry guards that were chosen more than a few months
5684 ago. This change should significantly improve client performance,
5685 especially once more people upgrade, since relays that have been
5686 a guard for a long time are currently overloaded.
5687 - Network status consensus documents and votes now contain bandwidth
5688 information for each relay. Clients use the bandwidth values
5689 in the consensus, rather than the bandwidth values in each
5690 relay descriptor. This approach opens the door to more accurate
5691 bandwidth estimates once the directory authorities start doing
5692 active measurements. Implements part of proposal 141.
5694 o Major features (relays):
5695 - Disable and refactor some debugging checks that forced a linear scan
5696 over the whole server-side DNS cache. These accounted for over 50%
5697 of CPU time on a relatively busy exit node's gprof profile. Also,
5698 disable some debugging checks that appeared in exit node profile
5699 data. Found by Jacob.
5700 - New DirPortFrontPage option that takes an html file and publishes
5701 it as "/" on the DirPort. Now relay operators can provide a
5702 disclaimer without needing to set up a separate webserver. There's
5703 a sample disclaimer in contrib/tor-exit-notice.html.
5705 o Major features (hidden services):
5706 - Make it possible to build hidden services that only certain clients
5707 are allowed to connect to. This is enforced at several points,
5708 so that unauthorized clients are unable to send INTRODUCE cells
5709 to the service, or even (depending on the type of authentication)
5710 to learn introduction points. This feature raises the bar for
5711 certain kinds of active attacks against hidden services. Design
5712 and code by Karsten Loesing. Implements proposal 121.
5713 - Relays now store and serve v2 hidden service descriptors by default,
5714 i.e., the new default value for HidServDirectoryV2 is 1. This is
5715 the last step in proposal 114, which aims to make hidden service
5716 lookups more reliable.
5718 o Major features (path selection):
5719 - ExitNodes and Exclude*Nodes config options now allow you to restrict
5720 by country code ("{US}") or IP address or address pattern
5721 ("255.128.0.0/16"). Patch from Robert Hogan. It still needs some
5722 refinement to decide what config options should take priority if
5723 you ask to both use a particular node and exclude it.
5725 o Major features (misc):
5726 - When building a consensus, do not include routers that are down.
5727 This cuts down 30% to 40% on consensus size. Implements proposal
5729 - New TestingTorNetwork config option to allow adjustment of
5730 previously constant values that could slow bootstrapping. Implements
5731 proposal 135. Patch from Karsten.
5732 - Convert many internal address representations to optionally hold
5733 IPv6 addresses. Generate and accept IPv6 addresses in many protocol
5734 elements. Make resolver code handle nameservers located at IPv6
5736 - More work on making our TLS handshake blend in: modify the list
5737 of ciphers advertised by OpenSSL in client mode to even more
5738 closely resemble a common web browser. We cheat a little so that
5739 we can advertise ciphers that the locally installed OpenSSL doesn't
5741 - Use the TLS1 hostname extension to more closely resemble browser
5744 o Security fixes (anonymity/entropy):
5745 - Never use a connection with a mismatched address to extend a
5746 circuit, unless that connection is canonical. A canonical
5747 connection is one whose address is authenticated by the router's
5748 identity key, either in a NETINFO cell or in a router descriptor.
5749 - Implement most of proposal 110: The first K cells to be sent
5750 along a circuit are marked as special "early" cells; only K "early"
5751 cells will be allowed. Once this code is universal, we can block
5752 certain kinds of denial-of-service attack by requiring that EXTEND
5753 commands must be sent using an "early" cell.
5754 - Resume using OpenSSL's RAND_poll() for better (and more portable)
5755 cross-platform entropy collection again. We used to use it, then
5756 stopped using it because of a bug that could crash systems that
5757 called RAND_poll when they had a lot of fds open. It looks like the
5758 bug got fixed in late 2006. Our new behavior is to call RAND_poll()
5759 at startup, and to call RAND_poll() when we reseed later only if
5760 we have a non-buggy OpenSSL version.
5761 - When the client is choosing entry guards, now it selects at most
5762 one guard from a given relay family. Otherwise we could end up with
5763 all of our entry points into the network run by the same operator.
5764 Suggested by Camilo Viecco. Fix on 0.1.1.11-alpha.
5765 - Do not use or believe expired v3 authority certificates. Patch
5766 from Karsten. Bugfix in 0.2.0.x. Fixes bug 851.
5767 - Drop begin cells to a hidden service if they come from the middle
5768 of a circuit. Patch from lark.
5769 - When we erroneously receive two EXTEND cells for the same circuit
5770 ID on the same connection, drop the second. Patch from lark.
5771 - Authorities now vote for the Stable flag for any router whose
5772 weighted MTBF is at least 5 days, regardless of the mean MTBF.
5773 - Clients now never report any stream end reason except 'MISC'.
5774 Implements proposal 148.
5776 o Major bugfixes (crashes):
5777 - Parse dates and IPv4 addresses in a locale- and libc-independent
5778 manner, to avoid platform-dependent behavior on malformed input.
5779 - Fix a crash that occurs on exit nodes when a nameserver request
5780 timed out. Bugfix on 0.1.2.1-alpha; our CLEAR debugging code had
5781 been suppressing the bug since 0.1.2.10-alpha. Partial fix for
5783 - Do not assume that a stack-allocated character array will be
5784 64-bit aligned on platforms that demand that uint64_t access is
5785 aligned. Possible fix for bug 604.
5786 - Resolve a very rare crash bug that could occur when the user forced
5787 a nameserver reconfiguration during the middle of a nameserver
5788 probe. Fixes bug 526. Bugfix on 0.1.2.1-alpha.
5789 - Avoid a "0 divided by 0" calculation when calculating router uptime
5790 at directory authorities. Bugfix on 0.2.0.8-alpha.
5791 - Fix an assertion bug in parsing policy-related options; possible fix
5793 - Rate-limit too-many-sockets messages: when they happen, they happen
5794 a lot and end up filling up the disk. Resolves bug 748.
5795 - Fix a race condition that could cause crashes or memory corruption
5796 when running as a server with a controller listening for log
5798 - Avoid crashing when we have a policy specified in a DirPolicy or
5799 SocksPolicy or ReachableAddresses option with ports set on it,
5800 and we re-load the policy. May fix bug 996.
5801 - Fix an assertion failure on 64-bit platforms when we allocated
5802 memory right up to the end of a memarea, then realigned the memory
5803 one step beyond the end. Fixes a possible cause of bug 930.
5804 - Protect the count of open sockets with a mutex, so we can't
5805 corrupt it when two threads are closing or opening sockets at once.
5806 Fix for bug 939. Bugfix on 0.2.0.1-alpha.
5808 o Major bugfixes (clients):
5809 - Discard router descriptors as we load them if they are more than
5810 five days old. Otherwise if Tor is off for a long time and then
5811 starts with cached descriptors, it will try to use the onion keys
5812 in those obsolete descriptors when building circuits. Fixes bug 887.
5813 - When we choose to abandon a new entry guard because we think our
5814 older ones might be better, close any circuits pending on that
5815 new entry guard connection. This fix should make us recover much
5816 faster when our network is down and then comes back. Bugfix on
5817 0.1.2.8-beta; found by lodger.
5818 - When Tor clients restart after 1-5 days, they discard all their
5819 cached descriptors as too old, but they still use the cached
5820 consensus document. This approach is good for robustness, but
5821 bad for performance: since they don't know any bandwidths, they
5822 end up choosing at random rather than weighting their choice by
5823 speed. Fixed by the above feature of putting bandwidths in the
5826 o Major bugfixes (relays):
5827 - Relays were falling out of the networkstatus consensus for
5828 part of a day if they changed their local config but the
5829 authorities discarded their new descriptor as "not sufficiently
5830 different". Now directory authorities accept a descriptor as changed
5831 if BandwidthRate or BandwidthBurst changed. Partial fix for bug 962;
5833 - Ensure that two circuits can never exist on the same connection
5834 with the same circuit ID, even if one is marked for close. This
5835 is conceivably a bugfix for bug 779; fixes a bug on 0.1.0.4-rc.
5836 - Directory authorities were neglecting to mark relays down in their
5837 internal histories if the relays fall off the routerlist without
5838 ever being found unreachable. So there were relays in the histories
5839 that haven't been seen for eight months, and are listed as being
5840 up for eight months. This wreaked havoc on the "median wfu" and
5841 "median mtbf" calculations, in turn making Guard and Stable flags
5842 wrong, hurting network performance. Fixes bugs 696 and 969. Bugfix
5845 o Major bugfixes (hidden services):
5846 - When establishing a hidden service, introduction points that
5847 originate from cannibalized circuits were completely ignored
5848 and not included in rendezvous service descriptors. This might
5849 have been another reason for delay in making a hidden service
5850 available. Bugfix from long ago (0.0.9.x?)
5852 o Major bugfixes (memory and resource management):
5853 - Fixed some memory leaks -- some quite frequent, some almost
5854 impossible to trigger -- based on results from Coverity.
5855 - Speed up parsing and cut down on memory fragmentation by using
5856 stack-style allocations for parsing directory objects. Previously,
5857 this accounted for over 40% of allocations from within Tor's code
5858 on a typical directory cache.
5859 - Use a Bloom filter rather than a digest-based set to track which
5860 descriptors we need to keep around when we're cleaning out old
5861 router descriptors. This speeds up the computation significantly,
5862 and may reduce fragmentation.
5864 o New/changed config options:
5865 - Now NodeFamily and MyFamily config options allow spaces in
5866 identity fingerprints, so it's easier to paste them in.
5867 Suggested by Lucky Green.
5868 - Allow ports 465 and 587 in the default exit policy again. We had
5869 rejected them in 0.1.0.15, because back in 2005 they were commonly
5870 misconfigured and ended up as spam targets. We hear they are better
5871 locked down these days.
5872 - Make TrackHostExit mappings expire a while after their last use, not
5873 after their creation. Patch from Robert Hogan.
5874 - Add an ExcludeExitNodes option so users can list a set of nodes
5875 that should be be excluded from the exit node position, but
5876 allowed elsewhere. Implements proposal 151.
5877 - New --hush command-line option similar to --quiet. While --quiet
5878 disables all logging to the console on startup, --hush limits the
5879 output to messages of warning and error severity.
5880 - New configure/torrc options (--enable-geoip-stats,
5881 DirRecordUsageByCountry) to record how many IPs we've served
5882 directory info to in each country code, how many status documents
5883 total we've sent to each country code, and what share of the total
5884 directory requests we should expect to see.
5885 - Make outbound DNS packets respect the OutboundBindAddress setting.
5886 Fixes the bug part of bug 798. Bugfix on 0.1.2.2-alpha.
5887 - Allow separate log levels to be configured for different logging
5888 domains. For example, this allows one to log all notices, warnings,
5889 or errors, plus all memory management messages of level debug or
5890 higher, with: Log [MM] debug-err [*] notice-err file /var/log/tor.
5891 - Update to the "June 3 2009" ip-to-country file.
5893 o Minor features (relays):
5894 - Raise the minimum rate limiting to be a relay from 20000 bytes
5895 to 20480 bytes (aka 20KB/s), to match our documentation. Also
5896 update directory authorities so they always assign the Fast flag
5897 to relays with 20KB/s of capacity. Now people running relays won't
5898 suddenly find themselves not seeing any use, if the network gets
5900 - If we're a relay and we change our IP address, be more verbose
5901 about the reason that made us change. Should help track down
5902 further bugs for relays on dynamic IP addresses.
5903 - Exit servers can now answer resolve requests for ip6.arpa addresses.
5904 - Implement most of Proposal 152: allow specialized servers to permit
5905 single-hop circuits, and clients to use those servers to build
5906 single-hop circuits when using a specialized controller. Patch
5907 from Josh Albrecht. Resolves feature request 768.
5908 - When relays do their initial bandwidth measurement, don't limit
5909 to just our entry guards for the test circuits. Otherwise we tend
5910 to have multiple test circuits going through a single entry guard,
5911 which makes our bandwidth test less accurate. Fixes part of bug 654;
5912 patch contributed by Josh Albrecht.
5914 o Minor features (directory authorities):
5915 - Try not to open more than one descriptor-downloading connection
5916 to an authority at once. This should reduce load on directory
5917 authorities. Fixes bug 366.
5918 - Add cross-certification to newly generated certificates, so that
5919 a signing key is enough information to look up a certificate. Start
5920 serving certificates by <identity digest, signing key digest>
5921 pairs. Implements proposal 157.
5922 - When a directory authority downloads a descriptor that it then
5923 immediately rejects, do not retry downloading it right away. Should
5924 save some bandwidth on authorities. Fix for bug 888. Patch by
5926 - Directory authorities now serve a /tor/dbg-stability.txt URL to
5927 help debug WFU and MTBF calculations.
5928 - In directory authorities' approved-routers files, allow
5929 fingerprints with or without space.
5931 o Minor features (directory mirrors):
5932 - When a download gets us zero good descriptors, do not notify
5933 Tor that new directory information has arrived.
5934 - Servers support a new URL scheme for consensus downloads that
5935 allows the client to specify which authorities are trusted.
5936 The server then only sends the consensus if the client will trust
5937 it. Otherwise a 404 error is sent back. Clients use this
5938 new scheme when the server supports it (meaning it's running
5939 0.2.1.1-alpha or later). Implements proposal 134.
5941 o Minor features (bridges):
5942 - If the bridge config line doesn't specify a port, assume 443.
5943 This makes bridge lines a bit smaller and easier for users to
5945 - If we're using bridges and our network goes away, be more willing
5946 to forgive our bridges and try again when we get an application
5949 o Minor features (hidden services):
5950 - When the client launches an introduction circuit, retry with a
5951 new circuit after 30 seconds rather than 60 seconds.
5952 - Launch a second client-side introduction circuit in parallel
5953 after a delay of 15 seconds (based on work by Christian Wilms).
5954 - Hidden services start out building five intro circuits rather
5955 than three, and when the first three finish they publish a service
5956 descriptor using those. Now we publish our service descriptor much
5957 faster after restart.
5958 - Drop the requirement to have an open dir port for storing and
5959 serving v2 hidden service descriptors.
5961 o Minor features (build and packaging):
5962 - On Linux, use the prctl call to re-enable core dumps when the User
5964 - Try to make sure that the version of Libevent we're running with
5965 is binary-compatible with the one we built with. May address bug
5967 - Add a new --enable-local-appdata configuration switch to change
5968 the default location of the datadir on win32 from APPDATA to
5969 LOCAL_APPDATA. In the future, we should migrate to LOCAL_APPDATA
5970 entirely. Patch from coderman.
5971 - Build correctly against versions of OpenSSL 0.9.8 or later that
5972 are built without support for deprecated functions.
5973 - On platforms with a maximum syslog string length, truncate syslog
5974 messages to that length ourselves, rather than relying on the
5975 system to do it for us.
5976 - Automatically detect MacOSX versions earlier than 10.4.0, and
5977 disable kqueue from inside Tor when running with these versions.
5978 We previously did this from the startup script, but that was no
5979 help to people who didn't use the startup script. Resolves bug 863.
5980 - Build correctly when configured to build outside the main source
5981 path. Patch from Michael Gold.
5982 - Disable GCC's strict alias optimization by default, to avoid the
5983 likelihood of its introducing subtle bugs whenever our code violates
5984 the letter of C99's alias rules.
5985 - Change the contrib/tor.logrotate script so it makes the new
5986 logs as "_tor:_tor" rather than the default, which is generally
5987 "root:wheel". Fixes bug 676, reported by Serge Koksharov.
5988 - Change our header file guard macros to be less likely to conflict
5989 with system headers. Adam Langley noticed that we were conflicting
5990 with log.h on Android.
5991 - Add a couple of extra warnings to --enable-gcc-warnings for GCC 4.3,
5992 and stop using a warning that had become unfixably verbose under
5994 - Use a lockfile to make sure that two Tor processes are not
5995 simultaneously running with the same datadir.
5996 - Allow OpenSSL to use dynamic locks if it wants.
5997 - Add LIBS=-lrt to Makefile.am so the Tor RPMs use a static libevent.
5999 o Minor features (controllers):
6000 - When generating circuit events with verbose nicknames for
6001 controllers, try harder to look up nicknames for routers on a
6002 circuit. (Previously, we would look in the router descriptors we had
6003 for nicknames, but not in the consensus.) Partial fix for bug 941.
6004 - New controller event NEWCONSENSUS that lists the networkstatus
6005 lines for every recommended relay. Now controllers like Torflow
6006 can keep up-to-date on which relays they should be using.
6007 - New controller event "clients_seen" to report a geoip-based summary
6008 of which countries we've seen clients from recently. Now controllers
6009 like Vidalia can show bridge operators that they're actually making
6011 - Add a 'getinfo status/clients-seen' controller command, in case
6012 controllers want to hear clients_seen events but connect late.
6013 - New CONSENSUS_ARRIVED event to note when a new consensus has
6014 been fetched and validated.
6015 - Add an internal-use-only __ReloadTorrcOnSIGHUP option for
6016 controllers to prevent SIGHUP from reloading the configuration.
6018 - Return circuit purposes in response to GETINFO circuit-status.
6020 - Serve the latest v3 networkstatus consensus via the control
6021 port. Use "getinfo dir/status-vote/current/consensus" to fetch it.
6022 - Add a "GETINFO /status/bootstrap-phase" controller option, so the
6023 controller can query our current bootstrap state in case it attaches
6024 partway through and wants to catch up.
6025 - Provide circuit purposes along with circuit events to the controller.
6027 o Minor features (tools):
6028 - Do not have tor-resolve automatically refuse all .onion addresses;
6029 if AutomapHostsOnResolve is set in your torrc, this will work fine.
6030 - Add a -p option to tor-resolve for specifying the SOCKS port: some
6031 people find host:port too confusing.
6032 - Print the SOCKS5 error message string as well as the error code
6033 when a tor-resolve request fails. Patch from Jacob.
6035 o Minor bugfixes (memory and resource management):
6036 - Clients no longer cache certificates for authorities they do not
6037 recognize. Bugfix on 0.2.0.9-alpha.
6038 - Do not use C's stdio library for writing to log files. This will
6039 improve logging performance by a minute amount, and will stop
6040 leaking fds when our disk is full. Fixes bug 861.
6041 - Stop erroneous use of O_APPEND in cases where we did not in fact
6042 want to re-seek to the end of a file before every last write().
6043 - Fix a small alignment and memory-wasting bug on buffer chunks.
6045 - Add a malloc_good_size implementation to OpenBSD_malloc_linux.c,
6046 to avoid unused RAM in buffer chunks and memory pools.
6047 - Reduce the default smartlist size from 32 to 16; it turns out that
6048 most smartlists hold around 8-12 elements tops.
6049 - Make dumpstats() log the fullness and size of openssl-internal
6051 - If the user has applied the experimental SSL_MODE_RELEASE_BUFFERS
6052 patch to their OpenSSL, turn it on to save memory on servers. This
6053 patch will (with any luck) get included in a mainline distribution
6055 - Fix a memory leak when v3 directory authorities load their keys
6056 and cert from disk. Bugfix on 0.2.0.1-alpha.
6057 - Stop using malloc_usable_size() to use more area than we had
6058 actually allocated: it was safe, but made valgrind really unhappy.
6059 - Make the assert_circuit_ok() function work correctly on circuits that
6060 have already been marked for close.
6061 - Fix uninitialized size field for memory area allocation: may improve
6062 memory performance during directory parsing.
6064 o Minor bugfixes (clients):
6065 - Stop reloading the router list from disk for no reason when we
6066 run out of reachable directory mirrors. Once upon a time reloading
6067 it would set the 'is_running' flag back to 1 for them. It hasn't
6068 done that for a long time.
6069 - When we had picked an exit node for a connection, but marked it as
6070 "optional", and it turned out we had no onion key for the exit,
6071 stop wanting that exit and try again. This situation may not
6072 be possible now, but will probably become feasible with proposal
6073 158. Spotted by rovv. Fixes another case of bug 752.
6074 - Fix a bug in address parsing that was preventing bridges or hidden
6075 service targets from being at IPv6 addresses.
6076 - Do not remove routers as too old if we do not have any consensus
6077 document. Bugfix on 0.2.0.7-alpha.
6078 - When an exit relay resolves a stream address to a local IP address,
6079 do not just keep retrying that same exit relay over and
6080 over. Instead, just close the stream. Addresses bug 872. Bugfix
6081 on 0.2.0.32. Patch from rovv.
6082 - Made Tor a little less aggressive about deleting expired
6083 certificates. Partial fix for bug 854.
6084 - Treat duplicate certificate fetches as failures, so that we do
6085 not try to re-fetch an expired certificate over and over and over.
6086 - Do not say we're fetching a certificate when we'll in fact skip it
6087 because of a pending download.
6088 - If we have correct permissions on $datadir, we complain to stdout
6089 and fail to start. But dangerous permissions on
6090 $datadir/cached-status/ would cause us to open a log and complain
6091 there. Now complain to stdout and fail to start in both cases. Fixes
6092 bug 820, reported by seeess.
6094 o Minor bugfixes (bridges):
6095 - When we made bridge authorities stop serving bridge descriptors over
6096 unencrypted links, we also broke DirPort reachability testing for
6097 bridges. So bridges with a non-zero DirPort were printing spurious
6098 warns to their logs. Bugfix on 0.2.0.16-alpha. Fixes bug 709.
6099 - Don't allow a bridge to publish its router descriptor to a
6100 non-bridge directory authority. Fixes part of bug 932.
6101 - When we change to or from being a bridge, reset our counts of
6102 client usage by country. Fixes bug 932.
6104 o Minor bugfixes (relays):
6105 - Log correct error messages for DNS-related network errors on
6107 - Actually return -1 in the error case for read_bandwidth_usage().
6108 Harmless bug, since we currently don't care about the return value
6109 anywhere. Bugfix on 0.2.0.9-alpha.
6110 - Provide a more useful log message if bug 977 (related to buffer
6111 freelists) ever reappears, and do not crash right away.
6112 - We were already rejecting relay begin cells with destination port
6113 of 0. Now also reject extend cells with destination port or address
6114 of 0. Suggested by lark.
6115 - When we can't transmit a DNS request due to a network error, retry
6116 it after a while, and eventually transmit a failing response to
6117 the RESOLVED cell. Bugfix on 0.1.2.5-alpha.
6118 - Solve a bug that kept hardware crypto acceleration from getting
6119 enabled when accounting was turned on. Fixes bug 907. Bugfix on
6121 - When a canonical connection appears later in our internal list
6122 than a noncanonical one for a given OR ID, always use the
6123 canonical one. Bugfix on 0.2.0.12-alpha. Fixes bug 805.
6125 - Avoid some nasty corner cases in the logic for marking connections
6126 as too old or obsolete or noncanonical for circuits. Partial
6128 - Fix another interesting corner-case of bug 891 spotted by rovv:
6129 Previously, if two hosts had different amounts of clock drift, and
6130 one of them created a new connection with just the wrong timing,
6131 the other might decide to deprecate the new connection erroneously.
6132 Bugfix on 0.1.1.13-alpha.
6133 - If one win32 nameserver fails to get added, continue adding the
6134 rest, and don't automatically fail.
6135 - Fix a bug where an unreachable relay would establish enough
6136 reachability testing circuits to do a bandwidth test -- if
6137 we already have a connection to the middle hop of the testing
6138 circuit, then it could establish the last hop by using the existing
6139 connection. Bugfix on 0.1.2.2-alpha, exposed when we made testing
6140 circuits no longer use entry guards in 0.2.1.3-alpha.
6142 o Minor bugfixes (directory authorities):
6143 - Limit uploaded directory documents to be 16M rather than 500K.
6144 The directory authorities were refusing v3 consensus votes from
6145 other authorities, since the votes are now 504K. Fixes bug 959;
6146 bugfix on 0.0.2pre17 (where we raised it from 50K to 500K ;).
6147 - Directory authorities should never send a 503 "busy" response to
6148 requests for votes or keys. Bugfix on 0.2.0.8-alpha; exposed by
6150 - Fix code so authorities _actually_ send back X-Descriptor-Not-New
6151 headers. Bugfix on 0.2.0.10-alpha.
6153 o Minor bugfixes (hidden services):
6154 - When we can't find an intro key for a v2 hidden service descriptor,
6155 fall back to the v0 hidden service descriptor and log a bug message.
6156 Workaround for bug 1024.
6157 - In very rare situations new hidden service descriptors were
6158 published earlier than 30 seconds after the last change to the
6159 service. (We currently think that a hidden service descriptor
6160 that's been stable for 30 seconds is worth publishing.)
6161 - If a hidden service sends us an END cell, do not consider
6162 retrying the connection; just close it. Patch from rovv.
6163 - If we are not using BEGIN_DIR cells, don't attempt to contact hidden
6164 service directories if they have no advertised dir port. Bugfix
6167 o Minor bugfixes (tools):
6168 - In the torify(1) manpage, mention that tsocks will leak your
6171 o Minor bugfixes (controllers):
6172 - If the controller claimed responsibility for a stream, but that
6173 stream never finished making its connection, it would live
6174 forever in circuit_wait state. Now we close it after SocksTimeout
6175 seconds. Bugfix on 0.1.2.7-alpha; reported by Mike Perry.
6176 - Make DNS resolved controller events into "CLOSED", not
6177 "FAILED". Bugfix on 0.1.2.5-alpha. Fix by Robert Hogan. Resolves
6179 - The control port would close the connection before flushing long
6180 replies, such as the network consensus, if a QUIT command was issued
6181 before the reply had completed. Now, the control port flushes all
6182 pending replies before closing the connection. Also fix a spurious
6183 warning when a QUIT command is issued after a malformed or rejected
6184 AUTHENTICATE command, but before the connection was closed. Patch
6185 by Marcus Griep. Fixes bugs 1015 and 1016.
6186 - Fix a bug that made stream bandwidth get misreported to the
6189 o Deprecated and removed features:
6190 - The old "tor --version --version" command, which would print out
6191 the subversion "Id" of most of the source files, is now removed. It
6192 turned out to be less useful than we'd expected, and harder to
6194 - RedirectExits has been removed. It was deprecated since
6196 - Finally remove deprecated "EXTENDED_FORMAT" controller feature. It
6197 has been called EXTENDED_EVENTS since 0.1.2.4-alpha.
6198 - Cell pools are now always enabled; --disable-cell-pools is ignored.
6199 - Directory mirrors no longer fetch the v1 directory or
6200 running-routers files. They are obsolete, and nobody asks for them
6201 anymore. This is the first step to making v1 authorities obsolete.
6202 - Take out the TestVia config option, since it was a workaround for
6203 a bug that was fixed in Tor 0.1.1.21.
6204 - Mark RendNodes, RendExcludeNodes, HiddenServiceNodes, and
6205 HiddenServiceExcludeNodes as obsolete: they never worked properly,
6206 and nobody seems to be using them. Fixes bug 754. Bugfix on
6207 0.1.0.1-rc. Patch from Christian Wilms.
6208 - Remove all backward-compatibility code for relays running
6209 versions of Tor so old that they no longer work at all on the
6212 o Code simplifications and refactoring:
6213 - Tool-assisted documentation cleanup. Nearly every function or
6214 static variable in Tor should have its own documentation now.
6215 - Rename the confusing or_is_obsolete field to the more appropriate
6216 is_bad_for_new_circs, and move it to or_connection_t where it
6218 - Move edge-only flags from connection_t to edge_connection_t: not
6219 only is this better coding, but on machines of plausible alignment,
6220 it should save 4-8 bytes per connection_t. "Every little bit helps."
6221 - Rename ServerDNSAllowBrokenResolvConf to ServerDNSAllowBrokenConfig
6222 for consistency; keep old option working for backward compatibility.
6223 - Simplify the code for finding connections to use for a circuit.
6224 - Revise the connection_new functions so that a more typesafe variant
6225 exists. This will work better with Coverity, and let us find any
6226 actual mistakes we're making here.
6227 - Refactor unit testing logic so that dmalloc can be used sensibly
6228 with unit tests to check for memory leaks.
6229 - Move all hidden-service related fields from connection and circuit
6230 structure to substructures: this way they won't eat so much memory.
6231 - Squeeze 2-5% out of client performance (according to oprofile) by
6232 improving the implementation of some policy-manipulation functions.
6233 - Change the implementation of ExcludeNodes and ExcludeExitNodes to
6234 be more efficient. Formerly it was quadratic in the number of
6235 servers; now it should be linear. Fixes bug 509.
6236 - Save 16-22 bytes per open circuit by moving the n_addr, n_port,
6237 and n_conn_id_digest fields into a separate structure that's
6238 only needed when the circuit has not yet attached to an n_conn.
6239 - Optimize out calls to time(NULL) that occur for every IO operation,
6240 or for every cell. On systems like Windows where time() is a
6241 slow syscall, this fix will be slightly helpful.
6244 Changes in version 0.2.0.35 - 2009-06-24
6246 - Avoid crashing in the presence of certain malformed descriptors.
6247 Found by lark, and by automated fuzzing.
6248 - Fix an edge case where a malicious exit relay could convince a
6249 controller that the client's DNS question resolves to an internal IP
6250 address. Bug found and fixed by "optimist"; bugfix on 0.1.2.8-beta.
6253 - Finally fix the bug where dynamic-IP relays disappear when their
6254 IP address changes: directory mirrors were mistakenly telling
6255 them their old address if they asked via begin_dir, so they
6256 never got an accurate answer about their new address, so they
6257 just vanished after a day. For belt-and-suspenders, relays that
6258 don't set Address in their config now avoid using begin_dir for
6259 all direct connections. Should fix bugs 827, 883, and 900.
6260 - Fix a timing-dependent, allocator-dependent, DNS-related crash bug
6261 that would occur on some exit nodes when DNS failures and timeouts
6262 occurred in certain patterns. Fix for bug 957.
6265 - When starting with a cache over a few days old, do not leak
6266 memory for the obsolete router descriptors in it. Bugfix on
6267 0.2.0.33; fixes bug 672.
6268 - Hidden service clients didn't use a cached service descriptor that
6269 was older than 15 minutes, but wouldn't fetch a new one either,
6270 because there was already one in the cache. Now, fetch a v2
6271 descriptor unless the same descriptor was added to the cache within
6272 the last 15 minutes. Fixes bug 997; reported by Marcus Griep.
6275 Changes in version 0.2.0.34 - 2009-02-08
6276 Tor 0.2.0.34 features several more security-related fixes. You should
6277 upgrade, especially if you run an exit relay (remote crash) or a
6278 directory authority (remote infinite loop), or you're on an older
6279 (pre-XP) or not-recently-patched Windows (remote exploit).
6281 This release marks end-of-life for Tor 0.1.2.x. Those Tor versions
6282 have many known flaws, and nobody should be using them. You should
6283 upgrade. If you're using a Linux or BSD and its packages are obsolete,
6284 stop using those packages and upgrade anyway.
6287 - Fix an infinite-loop bug on handling corrupt votes under certain
6288 circumstances. Bugfix on 0.2.0.8-alpha.
6289 - Fix a temporary DoS vulnerability that could be performed by
6290 a directory mirror. Bugfix on 0.2.0.9-alpha; reported by lark.
6291 - Avoid a potential crash on exit nodes when processing malformed
6292 input. Remote DoS opportunity. Bugfix on 0.2.0.33.
6293 - Do not accept incomplete ipv4 addresses (like 192.168.0) as valid.
6294 Spec conformance issue. Bugfix on Tor 0.0.2pre27.
6297 - Fix compilation on systems where time_t is a 64-bit integer.
6298 Patch from Matthias Drochner.
6299 - Don't consider expiring already-closed client connections. Fixes
6300 bug 893. Bugfix on 0.0.2pre20.
6303 Changes in version 0.2.0.33 - 2009-01-21
6304 Tor 0.2.0.33 fixes a variety of bugs that were making relays less
6305 useful to users. It also finally fixes a bug where a relay or client
6306 that's been off for many days would take a long time to bootstrap.
6308 This update also fixes an important security-related bug reported by
6309 Ilja van Sprundel. You should upgrade. (We'll send out more details
6310 about the bug once people have had some time to upgrade.)
6313 - Fix a heap-corruption bug that may be remotely triggerable on
6314 some platforms. Reported by Ilja van Sprundel.
6317 - When a stream at an exit relay is in state "resolving" or
6318 "connecting" and it receives an "end" relay cell, the exit relay
6319 would silently ignore the end cell and not close the stream. If
6320 the client never closes the circuit, then the exit relay never
6321 closes the TCP connection. Bug introduced in Tor 0.1.2.1-alpha;
6323 - When sending CREATED cells back for a given circuit, use a 64-bit
6324 connection ID to find the right connection, rather than an addr:port
6325 combination. Now that we can have multiple OR connections between
6326 the same ORs, it is no longer possible to use addr:port to uniquely
6327 identify a connection.
6328 - Bridge relays that had DirPort set to 0 would stop fetching
6329 descriptors shortly after startup, and then briefly resume
6330 after a new bandwidth test and/or after publishing a new bridge
6331 descriptor. Bridge users that try to bootstrap from them would
6332 get a recent networkstatus but would get descriptors from up to
6333 18 hours earlier, meaning most of the descriptors were obsolete
6334 already. Reported by Tas; bugfix on 0.2.0.13-alpha.
6335 - Prevent bridge relays from serving their 'extrainfo' document
6336 to anybody who asks, now that extrainfo docs include potentially
6337 sensitive aggregated client geoip summaries. Bugfix on
6339 - If the cached networkstatus consensus is more than five days old,
6340 discard it rather than trying to use it. In theory it could be
6341 useful because it lists alternate directory mirrors, but in practice
6342 it just means we spend many minutes trying directory mirrors that
6343 are long gone from the network. Also discard router descriptors as
6344 we load them if they are more than five days old, since the onion
6345 key is probably wrong by now. Bugfix on 0.2.0.x. Fixes bug 887.
6348 - Do not mark smartlist_bsearch_idx() function as ATTR_PURE. This bug
6349 could make gcc generate non-functional binary search code. Bugfix
6351 - Build correctly on platforms without socklen_t.
6352 - Compile without warnings on solaris.
6353 - Avoid potential crash on internal error during signature collection.
6354 Fixes bug 864. Patch from rovv.
6355 - Correct handling of possible malformed authority signing key
6356 certificates with internal signature types. Fixes bug 880.
6357 Bugfix on 0.2.0.3-alpha.
6358 - Fix a hard-to-trigger resource leak when logging credential status.
6360 - When we can't initialize DNS because the network is down, do not
6361 automatically stop Tor from starting. Instead, we retry failed
6362 dns_init() every 10 minutes, and change the exit policy to reject
6363 *:* until one succeeds. Fixes bug 691.
6364 - Use 64 bits instead of 32 bits for connection identifiers used with
6365 the controller protocol, to greatly reduce risk of identifier reuse.
6366 - When we're choosing an exit node for a circuit, and we have
6367 no pending streams, choose a good general exit rather than one that
6368 supports "all the pending streams". Bugfix on 0.1.1.x. Fix by rovv.
6369 - Fix another case of assuming, when a specific exit is requested,
6370 that we know more than the user about what hosts it allows.
6371 Fixes one case of bug 752. Patch from rovv.
6372 - Clip the MaxCircuitDirtiness config option to a minimum of 10
6373 seconds. Warn the user if lower values are given in the
6374 configuration. Bugfix on 0.1.0.1-rc. Patch by Sebastian.
6375 - Clip the CircuitBuildTimeout to a minimum of 30 seconds. Warn the
6376 user if lower values are given in the configuration. Bugfix on
6377 0.1.1.17-rc. Patch by Sebastian.
6378 - Fix a memory leak when we decline to add a v2 rendezvous descriptor to
6379 the cache because we already had a v0 descriptor with the same ID.
6380 Bugfix on 0.2.0.18-alpha.
6381 - Fix a race condition when freeing keys shared between main thread
6382 and CPU workers that could result in a memory leak. Bugfix on
6383 0.1.0.1-rc. Fixes bug 889.
6384 - Send a valid END cell back when a client tries to connect to a
6385 nonexistent hidden service port. Bugfix on 0.1.2.15. Fixes bug
6386 840. Patch from rovv.
6387 - Check which hops rendezvous stream cells are associated with to
6388 prevent possible guess-the-streamid injection attacks from
6389 intermediate hops. Fixes another case of bug 446. Based on patch
6391 - If a broken client asks a non-exit router to connect somewhere,
6392 do not even do the DNS lookup before rejecting the connection.
6393 Fixes another case of bug 619. Patch from rovv.
6394 - When a relay gets a create cell it can't decrypt (e.g. because it's
6395 using the wrong onion key), we were dropping it and letting the
6396 client time out. Now actually answer with a destroy cell. Fixes
6397 bug 904. Bugfix on 0.0.2pre8.
6399 o Minor bugfixes (hidden services):
6400 - Do not throw away existing introduction points on SIGHUP. Bugfix on
6401 0.0.6pre1. Patch by Karsten. Fixes bug 874.
6404 - Report the case where all signatures in a detached set are rejected
6405 differently than the case where there is an error handling the
6407 - When we realize that another process has modified our cached
6408 descriptors, print out a more useful error message rather than
6409 triggering an assertion. Fixes bug 885. Patch from Karsten.
6410 - Implement the 0x20 hack to better resist DNS poisoning: set the
6411 case on outgoing DNS requests randomly, and reject responses that do
6412 not match the case correctly. This logic can be disabled with the
6413 ServerDNSRamdomizeCase setting, if you are using one of the 0.3%
6414 of servers that do not reliably preserve case in replies. See
6415 "Increased DNS Forgery Resistance through 0x20-Bit Encoding"
6417 - Check DNS replies for more matching fields to better resist DNS
6419 - Never use OpenSSL compression: it wastes RAM and CPU trying to
6420 compress cells, which are basically all encrypted, compressed, or
6424 Changes in version 0.2.0.32 - 2008-11-20
6425 Tor 0.2.0.32 fixes a major security problem in Debian and Ubuntu
6426 packages (and maybe other packages) noticed by Theo de Raadt, fixes
6427 a smaller security flaw that might allow an attacker to access local
6428 services, further improves hidden service performance, and fixes a
6429 variety of other issues.
6432 - The "User" and "Group" config options did not clear the
6433 supplementary group entries for the Tor process. The "User" option
6434 is now more robust, and we now set the groups to the specified
6435 user's primary group. The "Group" option is now ignored. For more
6436 detailed logging on credential switching, set CREDENTIAL_LOG_LEVEL
6437 in common/compat.c to LOG_NOTICE or higher. Patch by Jacob Appelbaum
6438 and Steven Murdoch. Bugfix on 0.0.2pre14. Fixes bug 848 and 857.
6439 - The "ClientDNSRejectInternalAddresses" config option wasn't being
6440 consistently obeyed: if an exit relay refuses a stream because its
6441 exit policy doesn't allow it, we would remember what IP address
6442 the relay said the destination address resolves to, even if it's
6443 an internal IP address. Bugfix on 0.2.0.7-alpha; patch by rovv.
6446 - Fix a DOS opportunity during the voting signature collection process
6447 at directory authorities. Spotted by rovv. Bugfix on 0.2.0.x.
6449 o Major bugfixes (hidden services):
6450 - When fetching v0 and v2 rendezvous service descriptors in parallel,
6451 we were failing the whole hidden service request when the v0
6452 descriptor fetch fails, even if the v2 fetch is still pending and
6453 might succeed. Similarly, if the last v2 fetch fails, we were
6454 failing the whole hidden service request even if a v0 fetch is
6455 still pending. Fixes bug 814. Bugfix on 0.2.0.10-alpha.
6456 - When extending a circuit to a hidden service directory to upload a
6457 rendezvous descriptor using a BEGIN_DIR cell, almost 1/6 of all
6458 requests failed, because the router descriptor has not been
6459 downloaded yet. In these cases, do not attempt to upload the
6460 rendezvous descriptor, but wait until the router descriptor is
6461 downloaded and retry. Likewise, do not attempt to fetch a rendezvous
6462 descriptor from a hidden service directory for which the router
6463 descriptor has not yet been downloaded. Fixes bug 767. Bugfix
6467 - Fix several infrequent memory leaks spotted by Coverity.
6468 - When testing for libevent functions, set the LDFLAGS variable
6469 correctly. Found by Riastradh.
6470 - Avoid a bug where the FastFirstHopPK 0 option would keep Tor from
6471 bootstrapping with tunneled directory connections. Bugfix on
6472 0.1.2.5-alpha. Fixes bug 797. Found by Erwin Lam.
6473 - When asked to connect to A.B.exit:80, if we don't know the IP for A
6474 and we know that server B rejects most-but-not all connections to
6475 port 80, we would previously reject the connection. Now, we assume
6476 the user knows what they were asking for. Fixes bug 752. Bugfix
6477 on 0.0.9rc5. Diagnosed by BarkerJr.
6478 - If we overrun our per-second write limits a little, count this as
6479 having used up our write allocation for the second, and choke
6480 outgoing directory writes. Previously, we had only counted this when
6481 we had met our limits precisely. Fixes bug 824. Patch from by rovv.
6482 Bugfix on 0.2.0.x (??).
6483 - Remove the old v2 directory authority 'lefkada' from the default
6484 list. It has been gone for many months.
6485 - Stop doing unaligned memory access that generated bus errors on
6486 sparc64. Bugfix on 0.2.0.10-alpha. Fixes bug 862.
6487 - Make USR2 log-level switch take effect immediately. Bugfix on
6490 o Minor bugfixes (controller):
6491 - Make DNS resolved events into "CLOSED", not "FAILED". Bugfix on
6492 0.1.2.5-alpha. Fix by Robert Hogan. Resolves bug 807.
6495 Changes in version 0.2.0.31 - 2008-09-03
6496 Tor 0.2.0.31 addresses two potential anonymity issues, starts to fix
6497 a big bug we're seeing where in rare cases traffic from one Tor stream
6498 gets mixed into another stream, and fixes a variety of smaller issues.
6501 - Make sure that two circuits can never exist on the same connection
6502 with the same circuit ID, even if one is marked for close. This
6503 is conceivably a bugfix for bug 779. Bugfix on 0.1.0.4-rc.
6504 - Relays now reject risky extend cells: if the extend cell includes
6505 a digest of all zeroes, or asks to extend back to the relay that
6506 sent the extend cell, tear down the circuit. Ideas suggested
6508 - If not enough of our entry guards are available so we add a new
6509 one, we might use the new one even if it overlapped with the
6510 current circuit's exit relay (or its family). Anonymity bugfix
6511 pointed out by rovv.
6514 - Recover 3-7 bytes that were wasted per memory chunk. Fixes bug
6515 794; bug spotted by rovv. Bugfix on 0.2.0.1-alpha.
6516 - Correctly detect the presence of the linux/netfilter_ipv4.h header
6517 when building against recent kernels. Bugfix on 0.1.2.1-alpha.
6518 - Pick size of default geoip filename string correctly on windows.
6519 Fixes bug 806. Bugfix on 0.2.0.30.
6520 - Make the autoconf script accept the obsolete --with-ssl-dir
6521 option as an alias for the actually-working --with-openssl-dir
6522 option. Fix the help documentation to recommend --with-openssl-dir.
6523 Based on a patch by "Dave". Bugfix on 0.2.0.1-alpha.
6524 - When using the TransPort option on OpenBSD, and using the User
6525 option to change UID and drop privileges, make sure to open
6526 /dev/pf before dropping privileges. Fixes bug 782. Patch from
6527 Christopher Davis. Bugfix on 0.1.2.1-alpha.
6528 - Try to attach connections immediately upon receiving a RENDEZVOUS2
6529 or RENDEZVOUS_ESTABLISHED cell. This can save a second or two
6530 on the client side when connecting to a hidden service. Bugfix
6531 on 0.0.6pre1. Found and fixed by Christian Wilms; resolves bug 743.
6532 - When closing an application-side connection because its circuit is
6533 getting torn down, generate the stream event correctly. Bugfix on
6534 0.1.2.x. Anonymous patch.
6537 Changes in version 0.2.0.30 - 2008-07-15
6538 This new stable release switches to a more efficient directory
6539 distribution design, adds features to make connections to the Tor
6540 network harder to block, allows Tor to act as a DNS proxy, adds separate
6541 rate limiting for relayed traffic to make it easier for clients to
6542 become relays, fixes a variety of potential anonymity problems, and
6543 includes the usual huge pile of other features and bug fixes.
6545 o New v3 directory design:
6546 - Tor now uses a new way to learn about and distribute information
6547 about the network: the directory authorities vote on a common
6548 network status document rather than each publishing their own
6549 opinion. Now clients and caches download only one networkstatus
6550 document to bootstrap, rather than downloading one for each
6551 authority. Clients only download router descriptors listed in
6552 the consensus. Implements proposal 101; see doc/spec/dir-spec.txt
6554 - Set up moria1, tor26, and dizum as v3 directory authorities
6555 in addition to being v2 authorities. Also add three new ones:
6556 ides (run by Mike Perry), gabelmoo (run by Karsten Loesing), and
6557 dannenberg (run by CCC).
6558 - Switch to multi-level keys for directory authorities: now their
6559 long-term identity key can be kept offline, and they periodically
6560 generate a new signing key. Clients fetch the "key certificates"
6561 to keep up to date on the right keys. Add a standalone tool
6562 "tor-gencert" to generate key certificates. Implements proposal 103.
6563 - Add a new V3AuthUseLegacyKey config option to make it easier for
6564 v3 authorities to change their identity keys if another bug like
6565 Debian's OpenSSL RNG flaw appears.
6566 - Authorities and caches fetch the v2 networkstatus documents
6567 less often, now that v3 is recommended.
6569 o Make Tor connections stand out less on the wire:
6570 - Use an improved TLS handshake designed by Steven Murdoch in proposal
6571 124, as revised in proposal 130. The new handshake is meant to
6572 be harder for censors to fingerprint, and it adds the ability
6573 to detect certain kinds of man-in-the-middle traffic analysis
6574 attacks. The new handshake format includes version negotiation for
6575 OR connections as described in proposal 105, which will allow us
6576 to improve Tor's link protocol more safely in the future.
6577 - Enable encrypted directory connections by default for non-relays,
6578 so censor tools that block Tor directory connections based on their
6579 plaintext patterns will no longer work. This means Tor works in
6580 certain censored countries by default again.
6581 - Stop including recognizeable strings in the commonname part of
6582 Tor's x509 certificates.
6584 o Implement bridge relays:
6585 - Bridge relays (or "bridges" for short) are Tor relays that aren't
6586 listed in the main Tor directory. Since there is no complete public
6587 list of them, even an ISP that is filtering connections to all the
6588 known Tor relays probably won't be able to block all the bridges.
6589 See doc/design-paper/blocking.pdf and proposal 125 for details.
6590 - New config option BridgeRelay that specifies you want to be a
6591 bridge relay rather than a normal relay. When BridgeRelay is set
6592 to 1, then a) you cache dir info even if your DirPort ins't on,
6593 and b) the default for PublishServerDescriptor is now "bridge"
6594 rather than "v2,v3".
6595 - New config option "UseBridges 1" for clients that want to use bridge
6596 relays instead of ordinary entry guards. Clients then specify
6597 bridge relays by adding "Bridge" lines to their config file. Users
6598 can learn about a bridge relay either manually through word of
6599 mouth, or by one of our rate-limited mechanisms for giving out
6600 bridge addresses without letting an attacker easily enumerate them
6601 all. See https://www.torproject.org/bridges for details.
6602 - Bridge relays behave like clients with respect to time intervals
6603 for downloading new v3 consensus documents -- otherwise they
6604 stand out. Bridge users now wait until the end of the interval,
6605 so their bridge relay will be sure to have a new consensus document.
6607 o Implement bridge directory authorities:
6608 - Bridge authorities are like normal directory authorities, except
6609 they don't serve a list of known bridges. Therefore users that know
6610 a bridge's fingerprint can fetch a relay descriptor for that bridge,
6611 including fetching updates e.g. if the bridge changes IP address,
6612 yet an attacker can't just fetch a list of all the bridges.
6613 - Set up Tonga as the default bridge directory authority.
6614 - Bridge authorities refuse to serve bridge descriptors or other
6615 bridge information over unencrypted connections (that is, when
6616 responding to direct DirPort requests rather than begin_dir cells.)
6617 - Bridge directory authorities do reachability testing on the
6618 bridges they know. They provide router status summaries to the
6619 controller via "getinfo ns/purpose/bridge", and also dump summaries
6620 to a file periodically, so we can keep internal stats about which
6621 bridges are functioning.
6622 - If bridge users set the UpdateBridgesFromAuthority config option,
6623 but the digest they ask for is a 404 on the bridge authority,
6624 they fall back to contacting the bridge directly.
6625 - Bridges always use begin_dir to publish their server descriptor to
6626 the bridge authority using an anonymous encrypted tunnel.
6627 - Early work on a "bridge community" design: if bridge authorities set
6628 the BridgePassword config option, they will serve a snapshot of
6629 known bridge routerstatuses from their DirPort to anybody who
6630 knows that password. Unset by default.
6631 - Tor now includes an IP-to-country GeoIP file, so bridge relays can
6632 report sanitized aggregated summaries in their extra-info documents
6633 privately to the bridge authority, listing which countries are
6634 able to reach them. We hope this mechanism will let us learn when
6635 certain countries start trying to block bridges.
6636 - Bridge authorities write bridge descriptors to disk, so they can
6637 reload them after a reboot. They can also export the descriptors
6638 to other programs, so we can distribute them to blocked users via
6639 the BridgeDB interface, e.g. via https://bridges.torproject.org/
6640 and bridges@torproject.org.
6642 o Tor can be a DNS proxy:
6643 - The new client-side DNS proxy feature replaces the need for
6644 dns-proxy-tor: Just set "DNSPort 9999", and Tor will now listen
6645 for DNS requests on port 9999, use the Tor network to resolve them
6646 anonymously, and send the reply back like a regular DNS server.
6647 The code still only implements a subset of DNS.
6648 - Add a new AutomapHostsOnResolve option: when it is enabled, any
6649 resolve request for hosts matching a given pattern causes Tor to
6650 generate an internal virtual address mapping for that host. This
6651 allows DNSPort to work sensibly with hidden service users. By
6652 default, .exit and .onion addresses are remapped; the list of
6653 patterns can be reconfigured with AutomapHostsSuffixes.
6654 - Add an "-F" option to tor-resolve to force a resolve for a .onion
6655 address. Thanks to the AutomapHostsOnResolve option, this is no
6656 longer a completely silly thing to do.
6658 o Major features (relay usability):
6659 - New config options RelayBandwidthRate and RelayBandwidthBurst:
6660 a separate set of token buckets for relayed traffic. Right now
6661 relayed traffic is defined as answers to directory requests, and
6662 OR connections that don't have any local circuits on them. See
6663 proposal 111 for details.
6664 - Create listener connections before we setuid to the configured
6665 User and Group. Now non-Windows users can choose port values
6666 under 1024, start Tor as root, and have Tor bind those ports
6667 before it changes to another UID. (Windows users could already
6669 - Added a new ConstrainedSockets config option to set SO_SNDBUF and
6670 SO_RCVBUF on TCP sockets. Hopefully useful for Tor servers running
6671 on "vserver" accounts. Patch from coderman.
6673 o Major features (directory authorities):
6674 - Directory authorities track weighted fractional uptime and weighted
6675 mean-time-between failures for relays. WFU is suitable for deciding
6676 whether a node is "usually up", while MTBF is suitable for deciding
6677 whether a node is "likely to stay up." We need both, because
6678 "usually up" is a good requirement for guards, while "likely to
6679 stay up" is a good requirement for long-lived connections.
6680 - Directory authorities use a new formula for selecting which relays
6681 to advertise as Guards: they must be in the top 7/8 in terms of
6682 how long we have known about them, and above the median of those
6683 nodes in terms of weighted fractional uptime.
6684 - Directory authorities use a new formula for selecting which relays
6685 to advertise as Stable: when we have 4 or more days of data, use
6686 median measured MTBF rather than median declared uptime. Implements
6688 - Directory authorities accept and serve "extra info" documents for
6689 routers. Routers now publish their bandwidth-history lines in the
6690 extra-info docs rather than the main descriptor. This step saves
6691 60% (!) on compressed router descriptor downloads. Servers upload
6692 extra-info docs to any authority that accepts them; directory
6693 authorities now allow multiple router descriptors and/or extra
6694 info documents to be uploaded in a single go. Authorities, and
6695 caches that have been configured to download extra-info documents,
6696 download them as needed. Implements proposal 104.
6697 - Authorities now list relays who have the same nickname as
6698 a different named relay, but list them with a new flag:
6699 "Unnamed". Now we can make use of relays that happen to pick the
6700 same nickname as a server that registered two years ago and then
6701 disappeared. Implements proposal 122.
6702 - Store routers in a file called cached-descriptors instead of in
6703 cached-routers. Initialize cached-descriptors from cached-routers
6704 if the old format is around. The new format allows us to store
6705 annotations along with descriptors, to record the time we received
6706 each descriptor, its source, and its purpose: currently one of
6707 general, controller, or bridge.
6709 o Major features (other):
6710 - New config options WarnPlaintextPorts and RejectPlaintextPorts so
6711 Tor can warn and/or refuse connections to ports commonly used with
6712 vulnerable-plaintext protocols. Currently we warn on ports 23,
6713 109, 110, and 143, but we don't reject any. Based on proposal 129
6714 by Kevin Bauer and Damon McCoy.
6715 - Integrate Karsten Loesing's Google Summer of Code project to publish
6716 hidden service descriptors on a set of redundant relays that are a
6717 function of the hidden service address. Now we don't have to rely
6718 on three central hidden service authorities for publishing and
6719 fetching every hidden service descriptor. Implements proposal 114.
6720 - Allow tunnelled directory connections to ask for an encrypted
6721 "begin_dir" connection or an anonymized "uses a full Tor circuit"
6722 connection independently. Now we can make anonymized begin_dir
6723 connections for (e.g.) more secure hidden service posting and
6726 o Major bugfixes (crashes and assert failures):
6727 - Stop imposing an arbitrary maximum on the number of file descriptors
6728 used for busy servers. Bug reported by Olaf Selke; patch from
6730 - Avoid possible failures when generating a directory with routers
6731 with over-long versions strings, or too many flags set.
6732 - Fix a rare assert error when we're closing one of our threads:
6733 use a mutex to protect the list of logs, so we never write to the
6734 list as it's being freed. Fixes the very rare bug 575, which is
6735 kind of the revenge of bug 222.
6736 - Avoid segfault in the case where a badly behaved v2 versioning
6737 directory sends a signed networkstatus with missing client-versions.
6738 - When we hit an EOF on a log (probably because we're shutting down),
6739 don't try to remove the log from the list: just mark it as
6740 unusable. (Bulletproofs against bug 222.)
6742 o Major bugfixes (code security fixes):
6743 - Detect size overflow in zlib code. Reported by Justin Ferguson and
6745 - Rewrite directory tokenization code to never run off the end of
6746 a string. Fixes bug 455. Patch from croup.
6747 - Be more paranoid about overwriting sensitive memory on free(),
6748 as a defensive programming tactic to ensure forward secrecy.
6750 o Major bugfixes (anonymity fixes):
6751 - Reject requests for reverse-dns lookup of names that are in
6752 a private address space. Patch from lodger.
6753 - Never report that we've used more bandwidth than we're willing to
6754 relay: it leaks how much non-relay traffic we're using. Resolves
6756 - As a client, do not believe any server that tells us that an
6757 address maps to an internal address space.
6758 - Warn about unsafe ControlPort configurations.
6759 - Directory authorities now call routers Fast if their bandwidth is
6760 at least 100KB/s, and consider their bandwidth adequate to be a
6761 Guard if it is at least 250KB/s, no matter the medians. This fix
6762 complements proposal 107.
6763 - Directory authorities now never mark more than 2 servers per IP as
6764 Valid and Running (or 5 on addresses shared by authorities).
6765 Implements proposal 109, by Kevin Bauer and Damon McCoy.
6766 - If we're a relay, avoid picking ourselves as an introduction point,
6767 a rendezvous point, or as the final hop for internal circuits. Bug
6768 reported by taranis and lodger.
6769 - Exit relays that are used as a client can now reach themselves
6770 using the .exit notation, rather than just launching an infinite
6771 pile of circuits. Fixes bug 641. Reported by Sebastian Hahn.
6772 - Fix a bug where, when we were choosing the 'end stream reason' to
6773 put in our relay end cell that we send to the exit relay, Tor
6774 clients on Windows were sometimes sending the wrong 'reason'. The
6775 anonymity problem is that exit relays may be able to guess whether
6776 the client is running Windows, thus helping partition the anonymity
6777 set. Down the road we should stop sending reasons to exit relays,
6778 or otherwise prevent future versions of this bug.
6779 - Only update guard status (usable / not usable) once we have
6780 enough directory information. This was causing us to discard all our
6781 guards on startup if we hadn't been running for a few weeks. Fixes
6783 - When our directory information has been expired for a while, stop
6784 being willing to build circuits using it. Fixes bug 401.
6786 o Major bugfixes (peace of mind for relay operators)
6787 - Non-exit relays no longer answer "resolve" relay cells, so they
6788 can't be induced to do arbitrary DNS requests. (Tor clients already
6789 avoid using non-exit relays for resolve cells, but now servers
6790 enforce this too.) Fixes bug 619. Patch from lodger.
6791 - When we setconf ClientOnly to 1, close any current OR and Dir
6792 listeners. Reported by mwenge.
6794 o Major bugfixes (other):
6795 - If we only ever used Tor for hidden service lookups or posts, we
6796 would stop building circuits and start refusing connections after
6797 24 hours, since we falsely believed that Tor was dormant. Reported
6799 - Add a new __HashedControlSessionPassword option for controllers
6800 to use for one-off session password hashes that shouldn't get
6801 saved to disk by SAVECONF --- Vidalia users were accumulating a
6802 pile of HashedControlPassword lines in their torrc files, one for
6803 each time they had restarted Tor and then clicked Save. Make Tor
6804 automatically convert "HashedControlPassword" to this new option but
6805 only when it's given on the command line. Partial fix for bug 586.
6806 - Patch from "Andrew S. Lists" to catch when we contact a directory
6807 mirror at IP address X and he says we look like we're coming from
6808 IP address X. Otherwise this would screw up our address detection.
6809 - Reject uploaded descriptors and extrainfo documents if they're
6810 huge. Otherwise we'll cache them all over the network and it'll
6811 clog everything up. Suggested by Aljosha Judmayer.
6812 - When a hidden service was trying to establish an introduction point,
6813 and Tor *did* manage to reuse one of the preemptively built
6814 circuits, it didn't correctly remember which one it used,
6815 so it asked for another one soon after, until there were no
6816 more preemptive circuits, at which point it launched one from
6817 scratch. Bugfix on 0.0.9.x.
6819 o Rate limiting and load balancing improvements:
6820 - When we add data to a write buffer in response to the data on that
6821 write buffer getting low because of a flush, do not consider the
6822 newly added data as a candidate for immediate flushing, but rather
6823 make it wait until the next round of writing. Otherwise, we flush
6824 and refill recursively, and a single greedy TLS connection can
6825 eat all of our bandwidth.
6826 - When counting the number of bytes written on a TLS connection,
6827 look at the BIO actually used for writing to the network, not
6828 at the BIO used (sometimes) to buffer data for the network.
6829 Looking at different BIOs could result in write counts on the
6830 order of ULONG_MAX. Fixes bug 614.
6831 - If we change our MaxAdvertisedBandwidth and then reload torrc,
6832 Tor won't realize it should publish a new relay descriptor. Fixes
6833 bug 688, reported by mfr.
6834 - Avoid using too little bandwidth when our clock skips a few seconds.
6835 - Choose which bridge to use proportional to its advertised bandwidth,
6836 rather than uniformly at random. This should speed up Tor for
6837 bridge users. Also do this for people who set StrictEntryNodes.
6839 o Bootstrapping faster and building circuits more intelligently:
6840 - Fix bug 660 that was preventing us from knowing that we should
6841 preemptively build circuits to handle expected directory requests.
6842 - When we're checking if we have enough dir info for each relay
6843 to begin establishing circuits, make sure that we actually have
6844 the descriptor listed in the consensus, not just any descriptor.
6845 - Correctly notify one-hop connections when a circuit build has
6846 failed. Possible fix for bug 669. Found by lodger.
6847 - Clients now hold circuitless TLS connections open for 1.5 times
6848 MaxCircuitDirtiness (15 minutes), since it is likely that they'll
6849 rebuild a new circuit over them within that timeframe. Previously,
6850 they held them open only for KeepalivePeriod (5 minutes).
6852 o Performance improvements (memory):
6853 - Add OpenBSD malloc code from "phk" as an optional malloc
6854 replacement on Linux: some glibc libraries do very poorly with
6855 Tor's memory allocation patterns. Pass --enable-openbsd-malloc to
6856 ./configure to get the replacement malloc code.
6857 - Switch our old ring buffer implementation for one more like that
6858 used by free Unix kernels. The wasted space in a buffer with 1mb
6859 of data will now be more like 8k than 1mb. The new implementation
6860 also avoids realloc();realloc(); patterns that can contribute to
6861 memory fragmentation.
6862 - Change the way that Tor buffers data that it is waiting to write.
6863 Instead of queueing data cells in an enormous ring buffer for each
6864 client->OR or OR->OR connection, we now queue cells on a separate
6865 queue for each circuit. This lets us use less slack memory, and
6866 will eventually let us be smarter about prioritizing different kinds
6868 - Reference-count and share copies of address policy entries; only 5%
6869 of them were actually distinct.
6870 - Tune parameters for cell pool allocation to minimize amount of
6872 - Keep unused 4k and 16k buffers on free lists, rather than wasting 8k
6873 for every single inactive connection_t. Free items from the
6874 4k/16k-buffer free lists when they haven't been used for a while.
6875 - Make memory debugging information describe more about history
6876 of cell allocation, so we can help reduce our memory use.
6877 - Be even more aggressive about releasing RAM from small
6878 empty buffers. Thanks to our free-list code, this shouldn't be too
6879 performance-intensive.
6880 - Log malloc statistics from mallinfo() on platforms where it exists.
6881 - Use memory pools to allocate cells with better speed and memory
6882 efficiency, especially on platforms where malloc() is inefficient.
6883 - Add a --with-tcmalloc option to the configure script to link
6884 against tcmalloc (if present). Does not yet search for non-system
6887 o Performance improvements (socket management):
6888 - Count the number of open sockets separately from the number of
6889 active connection_t objects. This will let us avoid underusing
6890 our allocated connection limit.
6891 - We no longer use socket pairs to link an edge connection to an
6892 anonymous directory connection or a DirPort test connection.
6893 Instead, we track the link internally and transfer the data
6894 in-process. This saves two sockets per "linked" connection (at the
6895 client and at the server), and avoids the nasty Windows socketpair()
6897 - We were leaking a file descriptor if Tor started with a zero-length
6898 cached-descriptors file. Patch by "freddy77".
6900 o Performance improvements (CPU use):
6901 - Never walk through the list of logs if we know that no log target
6902 is interested in a given message.
6903 - Call routerlist_remove_old_routers() much less often. This should
6904 speed startup, especially on directory caches.
6905 - Base64 decoding was actually showing up on our profile when parsing
6906 the initial descriptor file; switch to an in-process all-at-once
6907 implementation that's about 3.5x times faster than calling out to
6909 - Use a slightly simpler string hashing algorithm (copying Python's
6910 instead of Java's) and optimize our digest hashing algorithm to take
6911 advantage of 64-bit platforms and to remove some possibly-costly
6913 - When implementing AES counter mode, update only the portions of the
6914 counter buffer that need to change, and don't keep separate
6915 network-order and host-order counters on big-endian hosts (where
6917 - Add an in-place version of aes_crypt() so that we can avoid doing a
6918 needless memcpy() call on each cell payload.
6919 - Use Critical Sections rather than Mutexes for synchronizing threads
6920 on win32; Mutexes are heavier-weight, and designed for synchronizing
6923 o Performance improvements (bandwidth use):
6924 - Don't try to launch new descriptor downloads quite so often when we
6925 already have enough directory information to build circuits.
6926 - Version 1 directories are no longer generated in full. Instead,
6927 authorities generate and serve "stub" v1 directories that list
6928 no servers. This will stop Tor versions 0.1.0.x and earlier from
6929 working, but (for security reasons) nobody should be running those
6931 - Avoid going directly to the directory authorities even if you're a
6932 relay, if you haven't found yourself reachable yet or if you've
6933 decided not to advertise your dirport yet. Addresses bug 556.
6934 - If we've gone 12 hours since our last bandwidth check, and we
6935 estimate we have less than 50KB bandwidth capacity but we could
6936 handle more, do another bandwidth test.
6937 - Support "If-Modified-Since" when answering HTTP requests for
6938 directories, running-routers documents, and v2 and v3 networkstatus
6939 documents. (There's no need to support it for router descriptors,
6940 since those are downloaded by descriptor digest.)
6941 - Stop fetching directory info so aggressively if your DirPort is
6942 on but your ORPort is off; stop fetching v2 dir info entirely.
6943 You can override these choices with the new FetchDirInfoEarly
6946 o Changed config option behavior (features):
6947 - Configuration files now accept C-style strings as values. This
6948 helps encode characters not allowed in the current configuration
6949 file format, such as newline or #. Addresses bug 557.
6950 - Add hidden services and DNSPorts to the list of things that make
6951 Tor accept that it has running ports. Change starting Tor with no
6952 ports from a fatal error to a warning; we might change it back if
6953 this turns out to confuse anybody. Fixes bug 579.
6954 - Make PublishServerDescriptor default to 1, so the default doesn't
6955 have to change as we invent new directory protocol versions.
6956 - Allow people to say PreferTunnelledDirConns rather than
6957 PreferTunneledDirConns, for those alternate-spellers out there.
6958 - Raise the default BandwidthRate/BandwidthBurst to 5MB/10MB, to
6959 accommodate the growing number of servers that use the default
6960 and are reaching it.
6961 - Make it possible to enable HashedControlPassword and
6962 CookieAuthentication at the same time.
6963 - When a TrackHostExits-chosen exit fails too many times in a row,
6964 stop using it. Fixes bug 437.
6966 o Changed config option behavior (bugfixes):
6967 - Do not read the configuration file when we've only been told to
6968 generate a password hash. Fixes bug 643. Bugfix on 0.0.9pre5. Fix
6969 based on patch from Sebastian Hahn.
6970 - Actually validate the options passed to AuthDirReject,
6971 AuthDirInvalid, AuthDirBadDir, and AuthDirBadExit.
6972 - Make "ClientOnly 1" config option disable directory ports too.
6973 - Don't stop fetching descriptors when FetchUselessDescriptors is
6974 set, even if we stop asking for circuits. Bug reported by tup
6976 - Servers used to decline to publish their DirPort if their
6977 BandwidthRate or MaxAdvertisedBandwidth were below a threshold. Now
6978 they look only at BandwidthRate and RelayBandwidthRate.
6979 - Treat "2gb" when given in torrc for a bandwidth as meaning 2gb,
6980 minus 1 byte: the actual maximum declared bandwidth.
6981 - Make "TrackHostExits ." actually work. Bugfix on 0.1.0.x.
6982 - Make the NodeFamilies config option work. (Reported by
6983 lodger -- it has never actually worked, even though we added it
6985 - If Tor is invoked from something that isn't a shell (e.g. Vidalia),
6986 now we expand "-f ~/.tor/torrc" correctly. Suggested by Matt Edman.
6988 o New config options:
6989 - New configuration options AuthDirMaxServersPerAddr and
6990 AuthDirMaxServersperAuthAddr to override default maximum number
6991 of servers allowed on a single IP address. This is important for
6992 running a test network on a single host.
6993 - Three new config options (AlternateDirAuthority,
6994 AlternateBridgeAuthority, and AlternateHSAuthority) that let the
6995 user selectively replace the default directory authorities by type,
6996 rather than the all-or-nothing replacement that DirServer offers.
6997 - New config options AuthDirBadDir and AuthDirListBadDirs for
6998 authorities to mark certain relays as "bad directories" in the
6999 networkstatus documents. Also supports the "!baddir" directive in
7000 the approved-routers file.
7001 - New config option V2AuthoritativeDirectory that all v2 directory
7002 authorities must set. This lets v3 authorities choose not to serve
7003 v2 directory information.
7005 o Minor features (other):
7006 - When we're not serving v2 directory information, there is no reason
7007 to actually keep any around. Remove the obsolete files and directory
7008 on startup if they are very old and we aren't going to serve them.
7009 - When we negotiate a v2 link-layer connection (not yet implemented),
7010 accept RELAY_EARLY cells and turn them into RELAY cells if we've
7011 negotiated a v1 connection for their next step. Initial steps for
7013 - When we have no consensus, check FallbackNetworkstatusFile (defaults
7014 to $PREFIX/share/tor/fallback-consensus) for a consensus. This way
7015 we can start out knowing some directory caches. We don't ship with
7016 a fallback consensus by default though, because it was making
7017 bootstrapping take too long while we tried many down relays.
7018 - Authorities send back an X-Descriptor-Not-New header in response to
7019 an accepted-but-discarded descriptor upload. Partially implements
7021 - If we find a cached-routers file that's been sitting around for more
7022 than 28 days unmodified, then most likely it's a leftover from
7023 when we upgraded to 0.2.0.8-alpha. Remove it. It has no good
7025 - When we (as a cache) download a descriptor because it was listed
7026 in a consensus, remember when the consensus was supposed to expire,
7027 and don't expire the descriptor until then.
7028 - Optionally (if built with -DEXPORTMALLINFO) export the output
7029 of mallinfo via http, as tor/mallinfo.txt. Only accessible
7031 - Tag every guard node in our state file with the version that
7032 we believe added it, or with our own version if we add it. This way,
7033 if a user temporarily runs an old version of Tor and then switches
7034 back to a new one, she doesn't automatically lose her guards.
7035 - When somebody requests a list of statuses or servers, and we have
7036 none of those, return a 404 rather than an empty 200.
7037 - Merge in some (as-yet-unused) IPv6 address manipulation code. (Patch
7039 - Add an HSAuthorityRecordStats option that hidden service authorities
7040 can use to track statistics of overall hidden service usage without
7041 logging information that would be as useful to an attacker.
7042 - Allow multiple HiddenServicePort directives with the same virtual
7043 port; when they occur, the user is sent round-robin to one
7044 of the target ports chosen at random. Partially fixes bug 393 by
7045 adding limited ad-hoc round-robining.
7046 - Revamp file-writing logic so we don't need to have the entire
7047 contents of a file in memory at once before we write to disk. Tor,
7050 o Minor bugfixes (other):
7051 - Alter the code that tries to recover from unhandled write
7052 errors, to not try to flush onto a socket that's given us
7054 - Directory mirrors no longer include a guess at the client's IP
7055 address if the connection appears to be coming from the same /24
7056 network; it was producing too many wrong guesses.
7057 - If we're trying to flush the last bytes on a connection (for
7058 example, when answering a directory request), reset the
7059 time-to-give-up timeout every time we manage to write something
7061 - Reject router descriptors with out-of-range bandwidthcapacity or
7062 bandwidthburst values.
7063 - If we can't expand our list of entry guards (e.g. because we're
7064 using bridges or we have StrictEntryNodes set), don't mark relays
7065 down when they fail a directory request. Otherwise we're too quick
7066 to mark all our entry points down.
7067 - Authorities no longer send back "400 you're unreachable please fix
7068 it" errors to Tor servers that aren't online all the time. We're
7069 supposed to tolerate these servers now.
7070 - Let directory authorities startup even when they can't generate
7071 a descriptor immediately, e.g. because they don't know their
7073 - Correctly enforce that elements of directory objects do not appear
7074 more often than they are allowed to appear.
7075 - Stop allowing hibernating servers to be "stable" or "fast".
7076 - On Windows, we were preventing other processes from reading
7077 cached-routers while Tor was running. (Reported by janbar)
7078 - Check return values from pthread_mutex functions.
7079 - When opening /dev/null in finish_daemonize(), do not pass the
7080 O_CREAT flag. Fortify was complaining, and correctly so. Fixes
7081 bug 742; fix from Michael Scherer. Bugfix on 0.0.2pre19.
7083 o Controller features:
7084 - The GETCONF command now escapes and quotes configuration values
7085 that don't otherwise fit into the torrc file.
7086 - The SETCONF command now handles quoted values correctly.
7087 - Add "GETINFO/desc-annotations/id/<OR digest>" so controllers can
7088 ask about source, timestamp of arrival, purpose, etc. We need
7089 something like this to help Vidalia not do GeoIP lookups on bridge
7091 - Allow multiple HashedControlPassword config lines, to support
7092 multiple controller passwords.
7093 - Accept LF instead of CRLF on controller, since some software has a
7094 hard time generating real Internet newlines.
7095 - Add GETINFO values for the server status events
7096 "REACHABILITY_SUCCEEDED" and "GOOD_SERVER_DESCRIPTOR". Patch from
7098 - There is now an ugly, temporary "desc/all-recent-extrainfo-hack"
7099 GETINFO for Torstat to use until it can switch to using extrainfos.
7100 - New config option CookieAuthFile to choose a new location for the
7101 cookie authentication file, and config option
7102 CookieAuthFileGroupReadable to make it group-readable.
7103 - Add a SOURCE_ADDR field to STREAM NEW events so that controllers can
7104 match requests to applications. Patch from Robert Hogan.
7105 - Add a RESOLVE command to launch hostname lookups. Original patch
7107 - Add GETINFO status/enough-dir-info to let controllers tell whether
7108 Tor has downloaded sufficient directory information. Patch from Tup.
7109 - You can now use the ControlSocket option to tell Tor to listen for
7110 controller connections on Unix domain sockets on systems that
7111 support them. Patch from Peter Palfrader.
7112 - New "GETINFO address-mappings/*" command to get address mappings
7113 with expiry information. "addr-mappings/*" is now deprecated.
7115 - Add a new config option __DisablePredictedCircuits designed for
7116 use by the controller, when we don't want Tor to build any circuits
7118 - Let the controller specify HOP=%d as an argument to ATTACHSTREAM,
7119 so we can exit from the middle of the circuit.
7120 - Implement "getinfo status/circuit-established".
7121 - Implement "getinfo status/version/..." so a controller can tell
7122 whether the current version is recommended, and whether any versions
7123 are good, and how many authorities agree. Patch from "shibz".
7124 - Controllers should now specify cache=no or cache=yes when using
7125 the +POSTDESCRIPTOR command.
7126 - Add a "PURPOSE=" argument to "STREAM NEW" events, as suggested by
7127 Robert Hogan. Fixes the first part of bug 681.
7128 - When reporting clock skew, and we know that the clock is _at least
7129 as skewed_ as some value, but we don't know the actual value,
7130 report the value as a "minimum skew."
7132 o Controller bugfixes:
7133 - Generate "STATUS_SERVER" events rather than misspelled
7134 "STATUS_SEVER" events. Caught by mwenge.
7135 - Reject controller commands over 1MB in length, so rogue
7136 processes can't run us out of memory.
7137 - Change the behavior of "getinfo status/good-server-descriptor"
7138 so it doesn't return failure when any authority disappears.
7139 - Send NAMESERVER_STATUS messages for a single failed nameserver
7141 - When the DANGEROUS_VERSION controller status event told us we're
7142 running an obsolete version, it used the string "OLD" to describe
7143 it. Yet the "getinfo" interface used the string "OBSOLETE". Now use
7144 "OBSOLETE" in both cases.
7145 - Respond to INT and TERM SIGNAL commands before we execute the
7146 signal, in case the signal shuts us down. We had a patch in
7147 0.1.2.1-alpha that tried to do this by queueing the response on
7148 the connection's buffer before shutting down, but that really
7149 isn't the same thing at all. Bug located by Matt Edman.
7150 - Provide DNS expiry times in GMT, not in local time. For backward
7151 compatibility, ADDRMAP events only provide GMT expiry in an extended
7152 field. "GETINFO address-mappings" always does the right thing.
7153 - Use CRLF line endings properly in NS events.
7154 - Make 'getinfo fingerprint' return a 551 error if we're not a
7155 server, so we match what the control spec claims we do. Reported
7157 - Fix a typo in an error message when extendcircuit fails that
7158 caused us to not follow the \r\n-based delimiter protocol. Reported
7160 - When tunneling an encrypted directory connection, and its first
7161 circuit fails, do not leave it unattached and ask the controller
7162 to deal. Fixes the second part of bug 681.
7163 - Treat some 403 responses from directory servers as INFO rather than
7164 WARN-severity events.
7166 o Portability / building / compiling:
7167 - When building with --enable-gcc-warnings, check for whether Apple's
7168 warning "-Wshorten-64-to-32" is available.
7169 - Support compilation to target iPhone; patch from cjacker huang.
7170 To build for iPhone, pass the --enable-iphone option to configure.
7171 - Port Tor to build and run correctly on Windows CE systems, using
7172 the wcecompat library. Contributed by Valerio Lupi.
7173 - Detect non-ASCII platforms (if any still exist) and refuse to
7174 build there: some of our code assumes that 'A' is 65 and so on.
7175 - Clear up some MIPSPro compiler warnings.
7176 - Make autoconf search for libevent, openssl, and zlib consistently.
7177 - Update deprecated macros in configure.in.
7178 - When warning about missing headers, tell the user to let us
7179 know if the compile succeeds anyway, so we can downgrade the
7181 - Include the current subversion revision as part of the version
7182 string: either fetch it directly if we're in an SVN checkout, do
7183 some magic to guess it if we're in an SVK checkout, or use
7184 the last-detected version if we're building from a .tar.gz.
7185 Use this version consistently in log messages.
7186 - Correctly report platform name on Windows 95 OSR2 and Windows 98 SE.
7187 - Read resolv.conf files correctly on platforms where read() returns
7188 partial results on small file reads.
7189 - Build without verbose warnings even on gcc 4.2 and 4.3.
7190 - On Windows, correctly detect errors when listing the contents of
7191 a directory. Fix from lodger.
7192 - Run 'make test' as part of 'make dist', so we stop releasing so
7193 many development snapshots that fail their unit tests.
7194 - Add support to detect Libevent versions in the 1.4.x series
7196 - Add command-line arguments to unit-test executable so that we can
7197 invoke any chosen test from the command line rather than having
7198 to run the whole test suite at once; and so that we can turn on
7199 logging for the unit tests.
7200 - Do not automatically run configure from autogen.sh. This
7201 non-standard behavior tended to annoy people who have built other
7203 - Fix a macro/CPP interaction that was confusing some compilers:
7204 some GCCs don't like #if/#endif pairs inside macro arguments.
7206 - Fix macro collision between OpenSSL 0.9.8h and Windows headers.
7207 Fixes bug 704; fix from Steven Murdoch.
7208 - Correctly detect transparent proxy support on Linux hosts that
7209 require in.h to be included before netfilter_ipv4.h. Patch
7212 o Logging improvements:
7213 - When we haven't had any application requests lately, don't bother
7214 logging that we have expired a bunch of descriptors.
7215 - When attempting to open a logfile fails, tell us why.
7216 - Only log guard node status when guard node status has changed.
7217 - Downgrade the 3 most common "INFO" messages to "DEBUG". This will
7218 make "INFO" 75% less verbose.
7219 - When SafeLogging is disabled, log addresses along with all TLS
7221 - Report TLS "zero return" case as a "clean close" and "IO error"
7222 as a "close". Stop calling closes "unexpected closes": existing
7223 Tors don't use SSL_close(), so having a connection close without
7224 the TLS shutdown handshake is hardly unexpected.
7225 - When we receive a consensus from the future, warn about skew.
7226 - Make "not enough dir info yet" warnings describe *why* Tor feels
7227 it doesn't have enough directory info yet.
7228 - On the USR1 signal, when dmalloc is in use, log the top 10 memory
7229 consumers. (We already do this on HUP.)
7230 - Give more descriptive well-formedness errors for out-of-range
7231 hidden service descriptor/protocol versions.
7232 - Stop recommending that every server operator send mail to tor-ops.
7233 Resolves bug 597. Bugfix on 0.1.2.x.
7234 - Improve skew reporting: try to give the user a better log message
7235 about how skewed they are, and how much this matters.
7236 - New --quiet command-line option to suppress the default console log.
7237 Good in combination with --hash-password.
7238 - Don't complain that "your server has not managed to confirm that its
7239 ports are reachable" if we haven't been able to build any circuits
7241 - Detect the reason for failing to mmap a descriptor file we just
7242 wrote, and give a more useful log message. Fixes bug 533.
7243 - Always prepend "Bug: " to any log message about a bug.
7244 - When dumping memory usage, list bytes used in buffer memory
7246 - When running with dmalloc, dump more stats on hup and on exit.
7247 - Put a platform string (e.g. "Linux i686") in the startup log
7248 message, so when people paste just their logs, we know if it's
7249 OpenBSD or Windows or what.
7250 - When logging memory usage, break down memory used in buffers by
7252 - When we are reporting the DirServer line we just parsed, we were
7253 logging the second stanza of the key fingerprint, not the first.
7254 - Even though Windows is equally happy with / and \ as path separators,
7255 try to use \ consistently on Windows and / consistently on Unix: it
7256 makes the log messages nicer.
7257 - On OSX, stop warning the user that kqueue support in libevent is
7258 "experimental", since it seems to have worked fine for ages.
7260 o Contributed scripts and tools:
7261 - Update linux-tor-prio.sh script to allow QoS based on the uid of
7262 the Tor process. Patch from Marco Bonetti with tweaks from Mike
7264 - Include the "tor-ctrl.sh" bash script by Stefan Behte to provide
7265 Unix users an easy way to script their Tor process (e.g. by
7266 adjusting bandwidth based on the time of the day).
7267 - In the exitlist script, only consider the most recently published
7268 server descriptor for each server. Also, when the user requests
7269 a list of servers that _reject_ connections to a given address,
7270 explicitly exclude the IPs that also have servers that accept
7271 connections to that address. Resolves bug 405.
7272 - Include a new contrib/tor-exit-notice.html file that exit relay
7273 operators can put on their website to help reduce abuse queries.
7275 o Newly deprecated features:
7276 - The status/version/num-versioning and status/version/num-concurring
7277 GETINFO controller options are no longer useful in the v3 directory
7278 protocol: treat them as deprecated, and warn when they're used.
7279 - The RedirectExits config option is now deprecated.
7282 - Drop the old code to choke directory connections when the
7283 corresponding OR connections got full: thanks to the cell queue
7284 feature, OR conns don't get full any more.
7285 - Remove the old "dns worker" server DNS code: it hasn't been default
7286 since 0.1.2.2-alpha, and all the servers are using the new
7288 - Remove the code to generate the oldest (v1) directory format.
7289 - Remove support for the old bw_accounting file: we've been storing
7290 bandwidth accounting information in the state file since
7291 0.1.2.5-alpha. This may result in bandwidth accounting errors
7292 if you try to upgrade from 0.1.1.x or earlier, or if you try to
7293 downgrade to 0.1.1.x or earlier.
7294 - Drop support for OpenSSL version 0.9.6. Just about nobody was using
7295 it, it had no AES, and it hasn't seen any security patches since
7297 - Stop overloading the circuit_t.onionskin field for both "onionskin
7298 from a CREATE cell that we are waiting for a cpuworker to be
7299 assigned" and "onionskin from an EXTEND cell that we are going to
7300 send to an OR as soon as we are connected". Might help with bug 600.
7301 - Remove the tor_strpartition() function: its logic was confused,
7302 and it was only used for one thing that could be implemented far
7304 - Remove the contrib scripts ExerciseServer.py, PathDemo.py,
7305 and TorControl.py, as they use the old v0 controller protocol,
7306 and are obsoleted by TorFlow anyway.
7307 - Drop support for v1 rendezvous descriptors, since we never used
7308 them anyway, and the code has probably rotted by now. Based on
7309 patch from Karsten Loesing.
7310 - Stop allowing address masks that do not correspond to bit prefixes.
7311 We have warned about these for a really long time; now it's time
7312 to reject them. (Patch from croup.)
7313 - Remove an optimization in the AES counter-mode code that assumed
7314 that the counter never exceeded 2^68. When the counter can be set
7315 arbitrarily as an IV (as it is by Karsten's new hidden services
7316 code), this assumption no longer holds.
7317 - Disable the SETROUTERPURPOSE controller command: it is now
7321 Changes in version 0.1.2.19 - 2008-01-17
7322 Tor 0.1.2.19 fixes a huge memory leak on exit relays, makes the default
7323 exit policy a little bit more conservative so it's safer to run an
7324 exit relay on a home system, and fixes a variety of smaller issues.
7327 - Exit policies now reject connections that are addressed to a
7328 relay's public (external) IP address too, unless
7329 ExitPolicyRejectPrivate is turned off. We do this because too
7330 many relays are running nearby to services that trust them based
7334 - When the clock jumps forward a lot, do not allow the bandwidth
7335 buckets to become negative. Fixes bug 544.
7336 - Fix a memory leak on exit relays; we were leaking a cached_resolve_t
7337 on every successful resolve. Reported by Mike Perry.
7338 - Purge old entries from the "rephist" database and the hidden
7339 service descriptor database even when DirPort is zero.
7340 - Stop thinking that 0.1.2.x directory servers can handle "begin_dir"
7341 requests. Should ease bugs 406 and 419 where 0.1.2.x relays are
7342 crashing or mis-answering these requests.
7343 - When we decide to send a 503 response to a request for servers, do
7344 not then also send the server descriptors: this defeats the whole
7345 purpose. Fixes bug 539.
7348 - Changing the ExitPolicyRejectPrivate setting should cause us to
7349 rebuild our server descriptor.
7350 - Fix handling of hex nicknames when answering controller requests for
7351 networkstatus by name, or when deciding whether to warn about
7352 unknown routers in a config option. (Patch from mwenge.)
7353 - Fix a couple of hard-to-trigger autoconf problems that could result
7354 in really weird results on platforms whose sys/types.h files define
7355 nonstandard integer types.
7356 - Don't try to create the datadir when running --verify-config or
7357 --hash-password. Resolves bug 540.
7358 - If we were having problems getting a particular descriptor from the
7359 directory caches, and then we learned about a new descriptor for
7360 that router, we weren't resetting our failure count. Reported
7362 - Although we fixed bug 539 (where servers would send HTTP status 503
7363 responses _and_ send a body too), there are still servers out there
7364 that haven't upgraded. Therefore, make clients parse such bodies
7365 when they receive them.
7366 - Run correctly on systems where rlim_t is larger than unsigned long.
7367 This includes some 64-bit systems.
7368 - Run correctly on platforms (like some versions of OS X 10.5) where
7369 the real limit for number of open files is OPEN_FILES, not rlim_max
7370 from getrlimit(RLIMIT_NOFILES).
7371 - Avoid a spurious free on base64 failure.
7372 - Avoid segfaults on certain complex invocations of
7373 router_get_by_hexdigest().
7374 - Fix rare bug on REDIRECTSTREAM control command when called with no
7375 port set: it could erroneously report an error when none had
7379 Changes in version 0.1.2.18 - 2007-10-28
7380 Tor 0.1.2.18 fixes many problems including crash bugs, problems with
7381 hidden service introduction that were causing huge delays, and a big
7382 bug that was causing some servers to disappear from the network status
7383 lists for a few hours each day.
7385 o Major bugfixes (crashes):
7386 - If a connection is shut down abruptly because of something that
7387 happened inside connection_flushed_some(), do not call
7388 connection_finished_flushing(). Should fix bug 451:
7389 "connection_stop_writing: Assertion conn->write_event failed"
7390 Bugfix on 0.1.2.7-alpha.
7391 - Fix possible segfaults in functions called from
7392 rend_process_relay_cell().
7394 o Major bugfixes (hidden services):
7395 - Hidden services were choosing introduction points uniquely by
7396 hexdigest, but when constructing the hidden service descriptor
7397 they merely wrote the (potentially ambiguous) nickname.
7398 - Clients now use the v2 intro format for hidden service
7399 connections: they specify their chosen rendezvous point by identity
7400 digest rather than by (potentially ambiguous) nickname. These
7401 changes could speed up hidden service connections dramatically.
7403 o Major bugfixes (other):
7404 - Stop publishing a new server descriptor just because we get a
7405 HUP signal. This led (in a roundabout way) to some servers getting
7406 dropped from the networkstatus lists for a few hours each day.
7407 - When looking for a circuit to cannibalize, consider family as well
7408 as identity. Fixes bug 438. Bugfix on 0.1.0.x (which introduced
7409 circuit cannibalization).
7410 - When a router wasn't listed in a new networkstatus, we were leaving
7411 the flags for that router alone -- meaning it remained Named,
7412 Running, etc -- even though absence from the networkstatus means
7413 that it shouldn't be considered to exist at all anymore. Now we
7414 clear all the flags for routers that fall out of the networkstatus
7415 consensus. Fixes bug 529.
7418 - Don't try to access (or alter) the state file when running
7419 --list-fingerprint or --verify-config or --hash-password. Resolves
7421 - When generating information telling us how to extend to a given
7422 router, do not try to include the nickname if it is
7423 absent. Resolves bug 467.
7424 - Fix a user-triggerable segfault in expand_filename(). (There isn't
7425 a way to trigger this remotely.)
7426 - When sending a status event to the controller telling it that an
7427 OR address is reachable, set the port correctly. (Previously we
7428 were reporting the dir port.)
7429 - Fix a minor memory leak whenever a controller sends the PROTOCOLINFO
7430 command. Bugfix on 0.1.2.17.
7431 - When loading bandwidth history, do not believe any information in
7432 the future. Fixes bug 434.
7433 - When loading entry guard information, do not believe any information
7435 - When we have our clock set far in the future and generate an
7436 onion key, then re-set our clock to be correct, we should not stop
7437 the onion key from getting rotated.
7438 - On some platforms, accept() can return a broken address. Detect
7439 this more quietly, and deal accordingly. Fixes bug 483.
7440 - It's not actually an error to find a non-pending entry in the DNS
7441 cache when canceling a pending resolve. Don't log unless stuff
7442 is fishy. Resolves bug 463.
7443 - Don't reset trusted dir server list when we set a configuration
7444 option. Patch from Robert Hogan.
7447 Changes in version 0.1.2.17 - 2007-08-30
7448 Tor 0.1.2.17 features a new Vidalia version in the Windows and OS
7449 X bundles. Vidalia 0.0.14 makes authentication required for the
7450 ControlPort in the default configuration, which addresses important
7451 security risks. Everybody who uses Vidalia (or another controller)
7454 In addition, this Tor update fixes major load balancing problems with
7455 path selection, which should speed things up a lot once many people
7458 o Major bugfixes (security):
7459 - We removed support for the old (v0) control protocol. It has been
7460 deprecated since Tor 0.1.1.1-alpha, and keeping it secure has
7461 become more of a headache than it's worth.
7463 o Major bugfixes (load balancing):
7464 - When choosing nodes for non-guard positions, weight guards
7465 proportionally less, since they already have enough load. Patch
7467 - Raise the "max believable bandwidth" from 1.5MB/s to 10MB/s. This
7468 will allow fast Tor servers to get more attention.
7469 - When we're upgrading from an old Tor version, forget our current
7470 guards and pick new ones according to the new weightings. These
7471 three load balancing patches could raise effective network capacity
7472 by a factor of four. Thanks to Mike Perry for measurements.
7474 o Major bugfixes (stream expiration):
7475 - Expire not-yet-successful application streams in all cases if
7476 they've been around longer than SocksTimeout. Right now there are
7477 some cases where the stream will live forever, demanding a new
7478 circuit every 15 seconds. Fixes bug 454; reported by lodger.
7480 o Minor features (controller):
7481 - Add a PROTOCOLINFO controller command. Like AUTHENTICATE, it
7482 is valid before any authentication has been received. It tells
7483 a controller what kind of authentication is expected, and what
7484 protocol is spoken. Implements proposal 119.
7486 o Minor bugfixes (performance):
7487 - Save on most routerlist_assert_ok() calls in routerlist.c, thus
7488 greatly speeding up loading cached-routers from disk on startup.
7489 - Disable sentinel-based debugging for buffer code: we squashed all
7490 the bugs that this was supposed to detect a long time ago, and now
7491 its only effect is to change our buffer sizes from nice powers of
7492 two (which platform mallocs tend to like) to values slightly over
7493 powers of two (which make some platform mallocs sad).
7495 o Minor bugfixes (misc):
7496 - If exit bandwidth ever exceeds one third of total bandwidth, then
7497 use the correct formula to weight exit nodes when choosing paths.
7498 Based on patch from Mike Perry.
7499 - Choose perfectly fairly among routers when choosing by bandwidth and
7500 weighting by fraction of bandwidth provided by exits. Previously, we
7501 would choose with only approximate fairness, and correct ourselves
7502 if we ran off the end of the list.
7503 - If we require CookieAuthentication but we fail to write the
7504 cookie file, we would warn but not exit, and end up in a state
7505 where no controller could authenticate. Now we exit.
7506 - If we require CookieAuthentication, stop generating a new cookie
7507 every time we change any piece of our config.
7508 - Refuse to start with certain directory authority keys, and
7509 encourage people using them to stop.
7510 - Terminate multi-line control events properly. Original patch
7512 - Fix a minor memory leak when we fail to find enough suitable
7513 servers to choose a circuit.
7514 - Stop leaking part of the descriptor when we run into a particularly
7515 unparseable piece of it.
7518 Changes in version 0.1.2.16 - 2007-08-01
7519 Tor 0.1.2.16 fixes a critical security vulnerability that allows a
7520 remote attacker in certain situations to rewrite the user's torrc
7521 configuration file. This can completely compromise anonymity of users
7522 in most configurations, including those running the Vidalia bundles,
7523 TorK, etc. Or worse.
7525 o Major security fixes:
7526 - Close immediately after missing authentication on control port;
7527 do not allow multiple authentication attempts.
7530 Changes in version 0.1.2.15 - 2007-07-17
7531 Tor 0.1.2.15 fixes several crash bugs, fixes some anonymity-related
7532 problems, fixes compilation on BSD, and fixes a variety of other
7533 bugs. Everybody should upgrade.
7535 o Major bugfixes (compilation):
7536 - Fix compile on FreeBSD/NetBSD/OpenBSD. Oops.
7538 o Major bugfixes (crashes):
7539 - Try even harder not to dereference the first character after
7540 an mmap(). Reported by lodger.
7541 - Fix a crash bug in directory authorities when we re-number the
7542 routerlist while inserting a new router.
7543 - When the cached-routers file is an even multiple of the page size,
7544 don't run off the end and crash. (Fixes bug 455; based on idea
7546 - Fix eventdns.c behavior on Solaris: It is critical to include
7547 orconfig.h _before_ sys/types.h, so that we can get the expected
7548 definition of _FILE_OFFSET_BITS.
7550 o Major bugfixes (security):
7551 - Fix a possible buffer overrun when using BSD natd support. Bug
7553 - When sending destroy cells from a circuit's origin, don't include
7554 the reason for tearing down the circuit. The spec says we didn't,
7555 and now we actually don't. Reported by lodger.
7556 - Keep streamids from different exits on a circuit separate. This
7557 bug may have allowed other routers on a given circuit to inject
7558 cells into streams. Reported by lodger; fixes bug 446.
7559 - If there's a never-before-connected-to guard node in our list,
7560 never choose any guards past it. This way we don't expand our
7561 guard list unless we need to.
7563 o Minor bugfixes (guard nodes):
7564 - Weight guard selection by bandwidth, so that low-bandwidth nodes
7565 don't get overused as guards.
7567 o Minor bugfixes (directory):
7568 - Correctly count the number of authorities that recommend each
7569 version. Previously, we were under-counting by 1.
7570 - Fix a potential crash bug when we load many server descriptors at
7571 once and some of them make others of them obsolete. Fixes bug 458.
7573 o Minor bugfixes (hidden services):
7574 - Stop tearing down the whole circuit when the user asks for a
7575 connection to a port that the hidden service didn't configure.
7578 o Minor bugfixes (misc):
7579 - On Windows, we were preventing other processes from reading
7580 cached-routers while Tor was running. Reported by janbar.
7581 - Fix a possible (but very unlikely) bug in picking routers by
7582 bandwidth. Add a log message to confirm that it is in fact
7583 unlikely. Patch from lodger.
7584 - Backport a couple of memory leak fixes.
7585 - Backport miscellaneous cosmetic bugfixes.
7588 Changes in version 0.1.2.14 - 2007-05-25
7589 Tor 0.1.2.14 changes the addresses of two directory authorities (this
7590 change especially affects those who serve or use hidden services),
7591 and fixes several other crash- and security-related bugs.
7593 o Directory authority changes:
7594 - Two directory authorities (moria1 and moria2) just moved to new
7595 IP addresses. This change will particularly affect those who serve
7596 or use hidden services.
7598 o Major bugfixes (crashes):
7599 - If a directory server runs out of space in the connection table
7600 as it's processing a begin_dir request, it will free the exit stream
7601 but leave it attached to the circuit, leading to unpredictable
7602 behavior. (Reported by seeess, fixes bug 425.)
7603 - Fix a bug in dirserv_remove_invalid() that would cause authorities
7604 to corrupt memory under some really unlikely scenarios.
7605 - Tighten router parsing rules. (Bugs reported by Benedikt Boss.)
7606 - Avoid segfaults when reading from mmaped descriptor file. (Reported
7609 o Major bugfixes (security):
7610 - When choosing an entry guard for a circuit, avoid using guards
7611 that are in the same family as the chosen exit -- not just guards
7612 that are exactly the chosen exit. (Reported by lodger.)
7614 o Major bugfixes (resource management):
7615 - If a directory authority is down, skip it when deciding where to get
7616 networkstatus objects or descriptors. Otherwise we keep asking
7617 every 10 seconds forever. Fixes bug 384.
7618 - Count it as a failure if we fetch a valid network-status but we
7619 don't want to keep it. Otherwise we'll keep fetching it and keep
7620 not wanting to keep it. Fixes part of bug 422.
7621 - If all of our dirservers have given us bad or no networkstatuses
7622 lately, then stop hammering them once per minute even when we
7623 think they're failed. Fixes another part of bug 422.
7626 - Actually set the purpose correctly for descriptors inserted with
7628 - When we have k non-v2 authorities in our DirServer config,
7629 we ignored the last k authorities in the list when updating our
7631 - Correctly back-off from requesting router descriptors that we are
7632 having a hard time downloading.
7633 - Read resolv.conf files correctly on platforms where read() returns
7634 partial results on small file reads.
7635 - Don't rebuild the entire router store every time we get 32K of
7636 routers: rebuild it when the journal gets very large, or when
7637 the gaps in the store get very large.
7640 - When routers publish SVN revisions in their router descriptors,
7641 authorities now include those versions correctly in networkstatus
7643 - Warn when using a version of libevent before 1.3b to run a server on
7644 OSX or BSD: these versions interact badly with userspace threads.
7647 Changes in version 0.1.2.13 - 2007-04-24
7648 This release features some major anonymity fixes, such as safer path
7649 selection; better client performance; faster bootstrapping, better
7650 address detection, and better DNS support for servers; write limiting as
7651 well as read limiting to make servers easier to run; and a huge pile of
7652 other features and bug fixes. The bundles also ship with Vidalia 0.0.11.
7654 Tor 0.1.2.13 is released in memory of Rob Levin (1955-2006), aka lilo
7655 of the Freenode IRC network, remembering his patience and vision for
7656 free speech on the Internet.
7658 o Major features, client performance:
7659 - Weight directory requests by advertised bandwidth. Now we can
7660 let servers enable write limiting but still allow most clients to
7661 succeed at their directory requests. (We still ignore weights when
7662 choosing a directory authority; I hope this is a feature.)
7663 - Stop overloading exit nodes -- avoid choosing them for entry or
7664 middle hops when the total bandwidth available from non-exit nodes
7665 is much higher than the total bandwidth available from exit nodes.
7666 - Rather than waiting a fixed amount of time between retrying
7667 application connections, we wait only 10 seconds for the first,
7668 10 seconds for the second, and 15 seconds for each retry after
7669 that. Hopefully this will improve the expected user experience.
7670 - Sometimes we didn't bother sending a RELAY_END cell when an attempt
7671 to open a stream fails; now we do in more cases. This should
7672 make clients able to find a good exit faster in some cases, since
7673 unhandleable requests will now get an error rather than timing out.
7675 o Major features, client functionality:
7676 - Implement BEGIN_DIR cells, so we can connect to a directory
7677 server via TLS to do encrypted directory requests rather than
7678 plaintext. Enable via the TunnelDirConns and PreferTunneledDirConns
7679 config options if you like. For now, this feature only works if
7680 you already have a descriptor for the destination dirserver.
7681 - Add support for transparent application connections: this basically
7682 bundles the functionality of trans-proxy-tor into the Tor
7683 mainline. Now hosts with compliant pf/netfilter implementations
7684 can redirect TCP connections straight to Tor without diverting
7685 through SOCKS. (Based on patch from tup.)
7686 - Add support for using natd; this allows FreeBSDs earlier than
7687 5.1.2 to have ipfw send connections through Tor without using
7688 SOCKS. (Patch from Zajcev Evgeny with tweaks from tup.)
7690 o Major features, servers:
7691 - Setting up a dyndns name for your server is now optional: servers
7692 with no hostname or IP address will learn their IP address by
7693 asking the directory authorities. This code only kicks in when you
7694 would normally have exited with a "no address" error. Nothing's
7695 authenticated, so use with care.
7696 - Directory servers now spool server descriptors, v1 directories,
7697 and v2 networkstatus objects to buffers as needed rather than en
7698 masse. They also mmap the cached-routers files. These steps save
7700 - Stop requiring clients to have well-formed certificates, and stop
7701 checking nicknames in certificates. (Clients have certificates so
7702 that they can look like Tor servers, but in the future we might want
7703 to allow them to look like regular TLS clients instead. Nicknames
7704 in certificates serve no purpose other than making our protocol
7705 easier to recognize on the wire.) Implements proposal 106.
7707 o Improvements on DNS support:
7708 - Add "eventdns" asynchronous dns library originally based on code
7709 from Adam Langley. Now we can discard the old rickety dnsworker
7710 concept, and support a wider variety of DNS functions. Allows
7711 multithreaded builds on NetBSD and OpenBSD again.
7712 - Add server-side support for "reverse" DNS lookups (using PTR
7713 records so clients can determine the canonical hostname for a given
7714 IPv4 address). Only supported by servers using eventdns; servers
7715 now announce in their descriptors if they don't support eventdns.
7716 - Workaround for name servers (like Earthlink's) that hijack failing
7717 DNS requests and replace the no-such-server answer with a "helpful"
7718 redirect to an advertising-driven search portal. Also work around
7719 DNS hijackers who "helpfully" decline to hijack known-invalid
7720 RFC2606 addresses. Config option "ServerDNSDetectHijacking 0"
7721 lets you turn it off.
7722 - Servers now check for the case when common DNS requests are going to
7723 wildcarded addresses (i.e. all getting the same answer), and change
7724 their exit policy to reject *:* if it's happening.
7725 - When asked to resolve a hostname, don't use non-exit servers unless
7726 requested to do so. This allows servers with broken DNS to be
7727 useful to the network.
7728 - Start passing "ipv4" hints to getaddrinfo(), so servers don't do
7729 useless IPv6 DNS resolves.
7730 - Specify and implement client-side SOCKS5 interface for reverse DNS
7731 lookups (see doc/socks-extensions.txt). Also cache them.
7732 - When we change nameservers or IP addresses, reset and re-launch
7733 our tests for DNS hijacking.
7735 o Improvements on reachability testing:
7736 - Servers send out a burst of long-range padding cells once they've
7737 established that they're reachable. Spread them over 4 circuits,
7738 so hopefully a few will be fast. This exercises bandwidth and
7739 bootstraps them into the directory more quickly.
7740 - When we find our DirPort to be reachable, publish a new descriptor
7741 so we'll tell the world (reported by pnx).
7742 - Directory authorities now only decide that routers are reachable
7743 if their identity keys are as expected.
7744 - Do DirPort reachability tests less often, since a single test
7745 chews through many circuits before giving up.
7746 - Avoid some false positives during reachability testing: don't try
7747 to test via a server that's on the same /24 network as us.
7748 - Start publishing one minute or so after we find our ORPort
7749 to be reachable. This will help reduce the number of descriptors
7750 we have for ourselves floating around, since it's quite likely
7751 other things (e.g. DirPort) will change during that minute too.
7752 - Routers no longer try to rebuild long-term connections to directory
7753 authorities, and directory authorities no longer try to rebuild
7754 long-term connections to all servers. We still don't hang up
7755 connections in these two cases though -- we need to look at it
7756 more carefully to avoid flapping, and we likely need to wait til
7757 0.1.1.x is obsolete.
7759 o Improvements on rate limiting:
7760 - Enable write limiting as well as read limiting. Now we sacrifice
7761 capacity if we're pushing out lots of directory traffic, rather
7762 than overrunning the user's intended bandwidth limits.
7763 - Include TLS overhead when counting bandwidth usage; previously, we
7764 would count only the bytes sent over TLS, but not the bytes used
7766 - Servers decline directory requests much more aggressively when
7767 they're low on bandwidth. Otherwise they end up queueing more and
7768 more directory responses, which can't be good for latency.
7769 - But never refuse directory requests from local addresses.
7770 - Be willing to read or write on local connections (e.g. controller
7771 connections) even when the global rate limiting buckets are empty.
7772 - Flush local controller connection buffers periodically as we're
7773 writing to them, so we avoid queueing 4+ megabytes of data before
7775 - Revise and clean up the torrc.sample that we ship with; add
7776 a section for BandwidthRate and BandwidthBurst.
7778 o Major features, NT services:
7779 - Install as NT_AUTHORITY\LocalService rather than as SYSTEM; add a
7780 command-line flag so that admins can override the default by saying
7781 "tor --service install --user "SomeUser"". This will not affect
7782 existing installed services. Also, warn the user that the service
7783 will look for its configuration file in the service user's
7784 %appdata% directory. (We can't do the "hardwire the user's appdata
7785 directory" trick any more, since we may not have read access to that
7787 - Support running the Tor service with a torrc not in the same
7788 directory as tor.exe and default to using the torrc located in
7789 the %appdata%\Tor\ of the user who installed the service. Patch
7791 - Add an --ignore-missing-torrc command-line option so that we can
7792 get the "use sensible defaults if the configuration file doesn't
7793 exist" behavior even when specifying a torrc location on the
7795 - When stopping an NT service, wait up to 10 sec for it to actually
7796 stop. (Patch from Matt Edman; resolves bug 295.)
7798 o Directory authority improvements:
7799 - Stop letting hibernating or obsolete servers affect uptime and
7801 - Stop listing hibernating servers in the v1 directory.
7802 - Authorities no longer recommend exits as guards if this would shift
7803 too much load to the exit nodes.
7804 - Authorities now specify server versions in networkstatus. This adds
7805 about 2% to the size of compressed networkstatus docs, and allows
7806 clients to tell which servers support BEGIN_DIR and which don't.
7807 The implementation is forward-compatible with a proposed future
7808 protocol version scheme not tied to Tor versions.
7809 - DirServer configuration lines now have an orport= option so
7810 clients can open encrypted tunnels to the authorities without
7811 having downloaded their descriptors yet. Enabled for moria1,
7812 moria2, tor26, and lefkada now in the default configuration.
7813 - Add a BadDirectory flag to network status docs so that authorities
7814 can (eventually) tell clients about caches they believe to be
7815 broken. Not used yet.
7816 - Allow authorities to list nodes as bad exits in their
7817 approved-routers file by fingerprint or by address. If most
7818 authorities set a BadExit flag for a server, clients don't think
7819 of it as a general-purpose exit. Clients only consider authorities
7820 that advertise themselves as listing bad exits.
7821 - Patch from Steve Hildrey: Generate network status correctly on
7822 non-versioning dirservers.
7823 - Have directory authorities allow larger amounts of drift in uptime
7824 without replacing the server descriptor: previously, a server that
7825 restarted every 30 minutes could have 48 "interesting" descriptors
7827 - Reserve the nickname "Unnamed" for routers that can't pick
7828 a hostname: any router can call itself Unnamed; directory
7829 authorities will never allocate Unnamed to any particular router;
7830 clients won't believe that any router is the canonical Unnamed.
7832 o Directory mirrors and clients:
7833 - Discard any v1 directory info that's over 1 month old (for
7834 directories) or over 1 week old (for running-routers lists).
7835 - Clients track responses with status 503 from dirservers. After a
7836 dirserver has given us a 503, we try not to use it until an hour has
7837 gone by, or until we have no dirservers that haven't given us a 503.
7838 - When we get a 503 from a directory, and we're not a server, we no
7839 longer count the failure against the total number of failures
7840 allowed for the object we're trying to download.
7841 - Prepare for servers to publish descriptors less often: never
7842 discard a descriptor simply for being too old until either it is
7843 recommended by no authorities, or until we get a better one for
7844 the same router. Make caches consider retaining old recommended
7845 routers for even longer.
7846 - Directory servers now provide 'Pragma: no-cache' and 'Expires'
7847 headers for content, so that we can work better in the presence of
7848 caching HTTP proxies.
7849 - Stop fetching descriptors if you're not a dir mirror and you
7850 haven't tried to establish any circuits lately. (This currently
7851 causes some dangerous behavior, because when you start up again
7852 you'll use your ancient server descriptors.)
7854 o Major fixes, crashes:
7855 - Stop crashing when the controller asks us to resetconf more than
7856 one config option at once. (Vidalia 0.0.11 does this.)
7857 - Fix a longstanding obscure crash bug that could occur when we run
7858 out of DNS worker processes, if we're not using eventdns. (Resolves
7860 - Fix an assert that could trigger if a controller quickly set then
7861 cleared EntryNodes. (Bug found by Udo van den Heuvel.)
7862 - Avoid crash when telling controller about stream-status and a
7864 - Avoid sending junk to controllers or segfaulting when a controller
7865 uses EVENT_NEW_DESC with verbose nicknames.
7866 - Stop triggering asserts if the controller tries to extend hidden
7867 service circuits (reported by mwenge).
7868 - If we start a server with ClientOnly 1, then set ClientOnly to 0
7869 and hup, stop triggering an assert based on an empty onion_key.
7870 - Mask out all signals in sub-threads; only the libevent signal
7871 handler should be processing them. This should prevent some crashes
7872 on some machines using pthreads. (Patch from coderman.)
7873 - Disable kqueue on OS X 10.3 and earlier, to fix bug 371.
7875 o Major fixes, anonymity/security:
7876 - Automatically avoid picking more than one node from the same
7877 /16 network when constructing a circuit. Add an
7878 "EnforceDistinctSubnets" option to let people disable it if they
7879 want to operate private test networks on a single subnet.
7880 - When generating bandwidth history, round down to the nearest
7881 1k. When storing accounting data, round up to the nearest 1k.
7882 - When we're running as a server, remember when we last rotated onion
7883 keys, so that we will rotate keys once they're a week old even if
7884 we never stay up for a week ourselves.
7885 - If a client asked for a server by name, and there's a named server
7886 in our network-status but we don't have its descriptor yet, we
7887 could return an unnamed server instead.
7888 - Reject (most) attempts to use Tor circuits with length one. (If
7889 many people start using Tor as a one-hop proxy, exit nodes become
7890 a more attractive target for compromise.)
7891 - Just because your DirPort is open doesn't mean people should be
7892 able to remotely teach you about hidden service descriptors. Now
7893 only accept rendezvous posts if you've got HSAuthoritativeDir set.
7894 - Fix a potential race condition in the rpm installer. Found by
7896 - Do not log IPs with TLS failures for incoming TLS
7897 connections. (Fixes bug 382.)
7899 o Major fixes, other:
7900 - If our system clock jumps back in time, don't publish a negative
7901 uptime in the descriptor.
7902 - When we start during an accounting interval before it's time to wake
7903 up, remember to wake up at the correct time. (May fix bug 342.)
7904 - Previously, we would cache up to 16 old networkstatus documents
7905 indefinitely, if they came from nontrusted authorities. Now we
7906 discard them if they are more than 10 days old.
7907 - When we have a state file we cannot parse, tell the user and
7908 move it aside. Now we avoid situations where the user starts
7909 Tor in 1904, Tor writes a state file with that timestamp in it,
7910 the user fixes her clock, and Tor refuses to start.
7911 - Publish a new descriptor after we hup/reload. This is important
7912 if our config has changed such that we'll want to start advertising
7913 our DirPort now, etc.
7914 - If we are using an exit enclave and we can't connect, e.g. because
7915 its webserver is misconfigured to not listen on localhost, then
7916 back off and try connecting from somewhere else before we fail.
7918 o New config options or behaviors:
7919 - When EntryNodes are configured, rebuild the guard list to contain,
7920 in order: the EntryNodes that were guards before; the rest of the
7921 EntryNodes; the nodes that were guards before.
7922 - Do not warn when individual nodes in the configuration's EntryNodes,
7923 ExitNodes, etc are down: warn only when all possible nodes
7924 are down. (Fixes bug 348.)
7925 - Put a lower-bound on MaxAdvertisedBandwidth.
7926 - Start using the state file to store bandwidth accounting data:
7927 the bw_accounting file is now obsolete. We'll keep generating it
7928 for a while for people who are still using 0.1.2.4-alpha.
7929 - Try to batch changes to the state file so that we do as few
7930 disk writes as possible while still storing important things in
7932 - The state file and the bw_accounting file get saved less often when
7933 the AvoidDiskWrites config option is set.
7934 - Make PIDFile work on Windows.
7935 - Add internal descriptions for a bunch of configuration options:
7936 accessible via controller interface and in comments in saved
7938 - Reject *:563 (NNTPS) in the default exit policy. We already reject
7939 NNTP by default, so this seems like a sensible addition.
7940 - Clients now reject hostnames with invalid characters. This should
7941 avoid some inadvertent info leaks. Add an option
7942 AllowNonRFC953Hostnames to disable this behavior, in case somebody
7943 is running a private network with hosts called @, !, and #.
7944 - Check for addresses with invalid characters at the exit as well,
7945 and warn less verbosely when they fail. You can override this by
7946 setting ServerDNSAllowNonRFC953Addresses to 1.
7947 - Remove some options that have been deprecated since at least
7948 0.1.0.x: AccountingMaxKB, LogFile, DebugLogFile, LogLevel, and
7949 SysLog. Use AccountingMax instead of AccountingMaxKB, and use Log
7950 to set log options. Mark PathlenCoinWeight as obsolete.
7951 - Stop accepting certain malformed ports in configured exit policies.
7952 - When the user uses bad syntax in the Log config line, stop
7953 suggesting other bad syntax as a replacement.
7954 - Add new config option "ResolvConf" to let the server operator
7955 choose an alternate resolve.conf file when using eventdns.
7956 - If one of our entry guards is on the ExcludeNodes list, or the
7957 directory authorities don't think it's a good guard, treat it as
7958 if it were unlisted: stop using it as a guard, and throw it off
7959 the guards list if it stays that way for a long time.
7960 - Allow directory authorities to be marked separately as authorities
7961 for the v1 directory protocol, the v2 directory protocol, and
7962 as hidden service directories, to make it easier to retire old
7963 authorities. V1 authorities should set "HSAuthoritativeDir 1"
7964 to continue being hidden service authorities too.
7965 - Remove 8888 as a LongLivedPort, and add 6697 (IRCS).
7966 - Make TrackExitHosts case-insensitive, and fix the behavior of
7967 ".suffix" TrackExitHosts items to avoid matching in the middle of
7969 - New DirPort behavior: if you have your dirport set, you download
7970 descriptors aggressively like a directory mirror, whether or not
7974 - Create a new file ReleaseNotes which was the old ChangeLog. The
7975 new ChangeLog file now includes the notes for all development
7977 - Add a new address-spec.txt document to describe our special-case
7978 addresses: .exit, .onion, and .noconnnect.
7979 - Fork the v1 directory protocol into its own spec document,
7980 and mark dir-spec.txt as the currently correct (v2) spec.
7982 o Packaging, porting, and contrib
7983 - "tor --verify-config" now exits with -1(255) or 0 depending on
7984 whether the config options are bad or good.
7985 - The Debian package now uses --verify-config when (re)starting,
7986 to distinguish configuration errors from other errors.
7987 - Adapt a patch from goodell to let the contrib/exitlist script
7988 take arguments rather than require direct editing.
7989 - Prevent the contrib/exitlist script from printing the same
7990 result more than once.
7991 - Add support to tor-resolve tool for reverse lookups and SOCKS5.
7992 - In the hidden service example in torrc.sample, stop recommending
7993 esoteric and discouraged hidden service options.
7994 - Patch from Michael Mohr to contrib/cross.sh, so it checks more
7995 values before failing, and always enables eventdns.
7996 - Try to detect Windows correctly when cross-compiling.
7997 - Libevent-1.2 exports, but does not define in its headers, strlcpy.
7998 Try to fix this in configure.in by checking for most functions
7999 before we check for libevent.
8000 - Update RPMs to require libevent 1.2.
8001 - Experimentally re-enable kqueue on OSX when using libevent 1.1b
8002 or later. Log when we are doing this, so we can diagnose it when
8003 it fails. (Also, recommend libevent 1.1b for kqueue and
8004 win32 methods; deprecate libevent 1.0b harder; make libevent
8005 recommendation system saner.)
8006 - Build with recent (1.3+) libevents on platforms that do not
8007 define the nonstandard types "u_int8_t" and friends.
8008 - Remove architecture from OS X builds. The official builds are
8009 now universal binaries.
8010 - Run correctly on OS X platforms with case-sensitive filesystems.
8011 - Correctly set maximum connection limit on Cygwin. (This time
8013 - Start compiling on MinGW on Windows (patches from Mike Chiussi
8015 - Start compiling on MSVC6 on Windows (patches from Frediano Ziglio).
8016 - Finally fix the openssl warnings from newer gccs that believe that
8017 ignoring a return value is okay, but casting a return value and
8018 then ignoring it is a sign of madness.
8019 - On architectures where sizeof(int)>4, still clamp declarable
8020 bandwidth to INT32_MAX.
8022 o Minor features, controller:
8023 - Warn the user when an application uses the obsolete binary v0
8024 control protocol. We're planning to remove support for it during
8025 the next development series, so it's good to give people some
8027 - Add STREAM_BW events to report per-entry-stream bandwidth
8028 use. (Patch from Robert Hogan.)
8029 - Rate-limit SIGNEWNYM signals in response to controllers that
8030 impolitely generate them for every single stream. (Patch from
8031 mwenge; closes bug 394.)
8032 - Add a REMAP status to stream events to note that a stream's
8033 address has changed because of a cached address or a MapAddress
8035 - Make REMAP stream events have a SOURCE (cache or exit), and
8036 make them generated in every case where we get a successful
8037 connected or resolved cell.
8038 - Track reasons for OR connection failure; make these reasons
8039 available via the controller interface. (Patch from Mike Perry.)
8040 - Add a SOCKS_BAD_HOSTNAME client status event so controllers
8041 can learn when clients are sending malformed hostnames to Tor.
8042 - Specify and implement some of the controller status events.
8043 - Have GETINFO dir/status/* work on hosts with DirPort disabled.
8044 - Reimplement GETINFO so that info/names stays in sync with the
8046 - Implement "GETINFO fingerprint".
8047 - Implement "SETEVENTS GUARD" so controllers can get updates on
8048 entry guard status as it changes.
8049 - Make all connections to addresses of the form ".noconnect"
8050 immediately get closed. This lets application/controller combos
8051 successfully test whether they're talking to the same Tor by
8052 watching for STREAM events.
8053 - Add a REASON field to CIRC events; for backward compatibility, this
8054 field is sent only to controllers that have enabled the extended
8055 event format. Also, add additional reason codes to explain why
8056 a given circuit has been destroyed or truncated. (Patches from
8058 - Add a REMOTE_REASON field to extended CIRC events to tell the
8059 controller why a remote OR told us to close a circuit.
8060 - Stream events also now have REASON and REMOTE_REASON fields,
8061 working much like those for circuit events.
8062 - There's now a GETINFO ns/... field so that controllers can ask Tor
8063 about the current status of a router.
8064 - A new event type "NS" to inform a controller when our opinion of
8065 a router's status has changed.
8066 - Add a GETINFO events/names and GETINFO features/names so controllers
8067 can tell which events and features are supported.
8068 - A new CLEARDNSCACHE signal to allow controllers to clear the
8069 client-side DNS cache without expiring circuits.
8070 - Fix CIRC controller events so that controllers can learn the
8071 identity digests of non-Named servers used in circuit paths.
8072 - Let controllers ask for more useful identifiers for servers. Instead
8073 of learning identity digests for un-Named servers and nicknames
8074 for Named servers, the new identifiers include digest, nickname,
8075 and indication of Named status. Off by default; see control-spec.txt
8076 for more information.
8077 - Add a "getinfo address" controller command so it can display Tor's
8078 best guess to the user.
8079 - New controller event to alert the controller when our server
8080 descriptor has changed.
8081 - Give more meaningful errors on controller authentication failure.
8082 - Export the default exit policy via the control port, so controllers
8083 don't need to guess what it is / will be later.
8085 o Minor bugfixes, controller:
8086 - When creating a circuit via the controller, send a 'launched'
8087 event when we're done, so we follow the spec better.
8088 - Correct the control spec to match how the code actually responds
8089 to 'getinfo addr-mappings/*'. Reported by daejees.
8090 - The control spec described a GUARDS event, but the code
8091 implemented a GUARD event. Standardize on GUARD, but let people
8092 ask for GUARDS too. Reported by daejees.
8093 - Give the controller END_STREAM_REASON_DESTROY events _before_ we
8094 clear the corresponding on_circuit variable, and remember later
8095 that we don't need to send a redundant CLOSED event. (Resolves part
8097 - Report events where a resolve succeeded or where we got a socks
8098 protocol error correctly, rather than calling both of them
8100 - Change reported stream target addresses to IP consistently when
8101 we finally get the IP from an exit node.
8102 - Send log messages to the controller even if they happen to be very
8104 - Flush ERR-level controller status events just like we currently
8105 flush ERR-level log events, so that a Tor shutdown doesn't prevent
8106 the controller from learning about current events.
8107 - Report the circuit number correctly in STREAM CLOSED events. Bug
8108 reported by Mike Perry.
8109 - Do not report bizarre values for results of accounting GETINFOs
8110 when the last second's write or read exceeds the allotted bandwidth.
8111 - Report "unrecognized key" rather than an empty string when the
8112 controller tries to fetch a networkstatus that doesn't exist.
8113 - When the controller does a "GETINFO network-status", tell it
8114 about even those routers whose descriptors are very old, and use
8115 long nicknames where appropriate.
8116 - Fix handling of verbose nicknames with ORCONN controller events:
8117 make them show up exactly when requested, rather than exactly when
8119 - Controller signals now work on non-Unix platforms that don't define
8120 SIGUSR1 and SIGUSR2 the way we expect.
8121 - Respond to SIGNAL command before we execute the signal, in case
8122 the signal shuts us down. Suggested by Karsten Loesing.
8123 - Handle reporting OR_CONN_EVENT_NEW events to the controller.
8125 o Minor features, code performance:
8126 - Major performance improvement on inserting descriptors: change
8127 algorithm from O(n^2) to O(n).
8128 - Do not rotate onion key immediately after setting it for the first
8130 - Call router_have_min_dir_info half as often. (This is showing up in
8131 some profiles, but not others.)
8132 - When using GCC, make log_debug never get called at all, and its
8133 arguments never get evaluated, when no debug logs are configured.
8134 (This is showing up in some profiles, but not others.)
8135 - Statistics dumped by -USR2 now include a breakdown of public key
8136 operations, for profiling.
8137 - Make the common memory allocation path faster on machines where
8138 malloc(0) returns a pointer.
8139 - Split circuit_t into origin_circuit_t and or_circuit_t, and
8140 split connection_t into edge, or, dir, control, and base structs.
8141 These will save quite a bit of memory on busy servers, and they'll
8142 also help us track down bugs in the code and bugs in the spec.
8143 - Use OpenSSL's AES implementation on platforms where it's faster.
8144 This could save us as much as 10% CPU usage.
8146 o Minor features, descriptors and descriptor handling:
8147 - Avoid duplicate entries on MyFamily line in server descriptor.
8148 - When Tor receives a router descriptor that it asked for, but
8149 no longer wants (because it has received fresh networkstatuses
8150 in the meantime), do not warn the user. Cache the descriptor if
8151 we're a cache; drop it if we aren't.
8152 - Servers no longer ever list themselves in their "family" line,
8153 even if configured to do so. This makes it easier to configure
8154 family lists conveniently.
8156 o Minor fixes, confusing/misleading log messages:
8157 - Display correct results when reporting which versions are
8158 recommended, and how recommended they are. (Resolves bug 383.)
8159 - Inform the server operator when we decide not to advertise a
8160 DirPort due to AccountingMax enabled or a low BandwidthRate.
8161 - Only include function names in log messages for info/debug messages.
8162 For notice/warn/err, the content of the message should be clear on
8163 its own, and printing the function name only confuses users.
8164 - Remove even more protocol-related warnings from Tor server logs,
8165 such as bad TLS handshakes and malformed begin cells.
8166 - Fix bug 314: Tor clients issued "unsafe socks" warnings even
8167 when the IP address is mapped through MapAddress to a hostname.
8168 - Fix misleading log messages: an entry guard that is "unlisted",
8169 as well as not known to be "down" (because we've never heard
8170 of it), is not therefore "up".
8172 o Minor fixes, old/obsolete behavior:
8173 - Start assuming we can use a create_fast cell if we don't know
8174 what version a router is running.
8175 - We no longer look for identity and onion keys in "identity.key" and
8176 "onion.key" -- these were replaced by secret_id_key and
8177 secret_onion_key in 0.0.8pre1.
8178 - We no longer require unrecognized directory entries to be
8180 - Drop compatibility with obsolete Tors that permit create cells
8181 to have the wrong circ_id_type.
8182 - Remove code to special-case "-cvs" ending, since it has not
8183 actually mattered since 0.0.9.
8184 - Don't re-write the fingerprint file every restart, unless it has
8187 o Minor fixes, misc client-side behavior:
8188 - Always remove expired routers and networkstatus docs before checking
8189 whether we have enough information to build circuits. (Fixes
8191 - When computing clock skew from directory HTTP headers, consider what
8192 time it was when we finished asking for the directory, not what
8194 - Make our socks5 handling more robust to broken socks clients:
8195 throw out everything waiting on the buffer in between socks
8196 handshake phases, since they can't possibly (so the theory
8197 goes) have predicted what we plan to respond to them.
8198 - Expire socks connections if they spend too long waiting for the
8199 handshake to finish. Previously we would let them sit around for
8200 days, if the connecting application didn't close them either.
8201 - And if the socks handshake hasn't started, don't send a
8202 "DNS resolve socks failed" handshake reply; just close it.
8203 - If the user asks to use invalid exit nodes, be willing to use
8205 - Track unreachable entry guards correctly: don't conflate
8206 'unreachable by us right now' with 'listed as down by the directory
8207 authorities'. With the old code, if a guard was unreachable by us
8208 but listed as running, it would clog our guard list forever.
8209 - Behave correctly in case we ever have a network with more than
8210 2GB/s total advertised capacity.
8211 - Claim a commonname of Tor, rather than TOR, in TLS handshakes.
8212 - Fix a memory leak when we ask for "all" networkstatuses and we
8213 get one we don't recognize.
8216 Changes in version 0.1.1.26 - 2006-12-14
8217 o Security bugfixes:
8218 - Stop sending the HttpProxyAuthenticator string to directory
8219 servers when directory connections are tunnelled through Tor.
8220 - Clients no longer store bandwidth history in the state file.
8221 - Do not log introduction points for hidden services if SafeLogging
8225 - Fix an assert failure when a directory authority sets
8226 AuthDirRejectUnlisted and then receives a descriptor from an
8227 unlisted router (reported by seeess).
8230 Changes in version 0.1.1.25 - 2006-11-04
8232 - When a client asks us to resolve (rather than connect to)
8233 an address, and we have a cached answer, give them the cached
8234 answer. Previously, we would give them no answer at all.
8235 - We were building exactly the wrong circuits when we predict
8236 hidden service requirements, meaning Tor would have to build all
8237 its circuits on demand.
8238 - If none of our live entry guards have a high uptime, but we
8239 require a guard with a high uptime, try adding a new guard before
8240 we give up on the requirement. This patch should make long-lived
8241 connections more stable on average.
8242 - When testing reachability of our DirPort, don't launch new
8243 tests when there's already one in progress -- unreachable
8244 servers were stacking up dozens of testing streams.
8246 o Security bugfixes:
8247 - When the user sends a NEWNYM signal, clear the client-side DNS
8248 cache too. Otherwise we continue to act on previous information.
8251 - Avoid a memory corruption bug when creating a hash table for
8253 - Avoid possibility of controller-triggered crash when misusing
8254 certain commands from a v0 controller on platforms that do not
8255 handle printf("%s",NULL) gracefully.
8256 - Avoid infinite loop on unexpected controller input.
8257 - Don't log spurious warnings when we see a circuit close reason we
8258 don't recognize; it's probably just from a newer version of Tor.
8259 - Add Vidalia to the OS X uninstaller script, so when we uninstall
8260 Tor/Privoxy we also uninstall Vidalia.
8263 Changes in version 0.1.1.24 - 2006-09-29
8265 - Allow really slow clients to not hang up five minutes into their
8266 directory downloads (suggested by Adam J. Richter).
8267 - Fix major performance regression from 0.1.0.x: instead of checking
8268 whether we have enough directory information every time we want to
8269 do something, only check when the directory information has changed.
8270 This should improve client CPU usage by 25-50%.
8271 - Don't crash if, after a server has been running for a while,
8272 it can't resolve its hostname.
8273 - When a client asks us to resolve (not connect to) an address,
8274 and we have a cached answer, give them the cached answer.
8275 Previously, we would give them no answer at all.
8278 - Allow Tor to start when RunAsDaemon is set but no logs are set.
8279 - Don't crash when the controller receives a third argument to an
8280 "extendcircuit" request.
8281 - Controller protocol fixes: fix encoding in "getinfo addr-mappings"
8282 response; fix error code when "getinfo dir/status/" fails.
8283 - Fix configure.in to not produce broken configure files with
8284 more recent versions of autoconf. Thanks to Clint for his auto*
8286 - Fix security bug on NetBSD that could allow someone to force
8287 uninitialized RAM to be sent to a server's DNS resolver. This
8288 only affects NetBSD and other platforms that do not bounds-check
8290 - Warn user when using libevent 1.1a or earlier with win32 or kqueue
8291 methods: these are known to be buggy.
8292 - If we're a directory mirror and we ask for "all" network status
8293 documents, we would discard status documents from authorities
8297 Changes in version 0.1.1.23 - 2006-07-30
8299 - Fast Tor servers, especially exit nodes, were triggering asserts
8300 due to a bug in handling the list of pending DNS resolves. Some
8301 bugs still remain here; we're hunting them.
8302 - Entry guards could crash clients by sending unexpected input.
8303 - More fixes on reachability testing: if you find yourself reachable,
8304 then don't ever make any client requests (so you stop predicting
8305 circuits), then hup or have your clock jump, then later your IP
8306 changes, you won't think circuits are working, so you won't try to
8307 test reachability, so you won't publish.
8310 - Avoid a crash if the controller does a resetconf firewallports
8311 and then a setconf fascistfirewall=1.
8312 - Avoid an integer underflow when the dir authority decides whether
8313 a router is stable: we might wrongly label it stable, and compute
8314 a slightly wrong median stability, when a descriptor is published
8316 - Fix a place where we might trigger an assert if we can't build our
8317 own server descriptor yet.
8320 Changes in version 0.1.1.22 - 2006-07-05
8322 - Fix a big bug that was causing servers to not find themselves
8323 reachable if they changed IP addresses. Since only 0.1.1.22+
8324 servers can do reachability testing correctly, now we automatically
8325 make sure to test via one of these.
8326 - Fix to allow clients and mirrors to learn directory info from
8327 descriptor downloads that get cut off partway through.
8328 - Directory authorities had a bug in deciding if a newly published
8329 descriptor was novel enough to make everybody want a copy -- a few
8330 servers seem to be publishing new descriptors many times a minute.
8332 - Fix a rare bug that was causing some servers to complain about
8333 "closing wedged cpuworkers" and skip some circuit create requests.
8334 - Make the Exit flag in directory status documents actually work.
8337 Changes in version 0.1.1.21 - 2006-06-10
8338 o Crash and assert fixes from 0.1.1.20:
8339 - Fix a rare crash on Tor servers that have enabled hibernation.
8340 - Fix a seg fault on startup for Tor networks that use only one
8341 directory authority.
8342 - Fix an assert from a race condition that occurs on Tor servers
8343 while exiting, where various threads are trying to log that they're
8344 exiting, and delete the logs, at the same time.
8345 - Make our unit tests pass again on certain obscure platforms.
8348 - Add support for building SUSE RPM packages.
8349 - Speed up initial bootstrapping for clients: if we are making our
8350 first ever connection to any entry guard, then don't mark it down
8352 - When only one Tor server in the network is labelled as a guard,
8353 and we've already picked him, we would cycle endlessly picking him
8354 again, being unhappy about it, etc. Now we specifically exclude
8355 current guards when picking a new guard.
8356 - Servers send create cells more reliably after the TLS connection
8357 is established: we were sometimes forgetting to send half of them
8358 when we had more than one pending.
8359 - If we get a create cell that asks us to extend somewhere, but the
8360 Tor server there doesn't match the expected digest, we now send
8361 a destroy cell back, rather than silently doing nothing.
8362 - Make options->RedirectExit work again.
8363 - Make cookie authentication for the controller work again.
8364 - Stop being picky about unusual characters in the arguments to
8365 mapaddress. It's none of our business.
8366 - Add a new config option "TestVia" that lets you specify preferred
8367 middle hops to use for test circuits. Perhaps this will let me
8368 debug the reachability problems better.
8370 o Log / documentation fixes:
8371 - If we're a server and some peer has a broken TLS certificate, don't
8372 log about it unless ProtocolWarnings is set, i.e., we want to hear
8373 about protocol violations by others.
8374 - Fix spelling of VirtualAddrNetwork in man page.
8375 - Add a better explanation at the top of the autogenerated torrc file
8376 about what happened to our old torrc.
8379 Changes in version 0.1.1.20 - 2006-05-23
8380 o Crash and assert fixes from 0.1.0.17:
8381 - Fix assert bug in close_logs() on exit: when we close and delete
8382 logs, remove them all from the global "logfiles" list.
8383 - Fix an assert error when we're out of space in the connection_list
8384 and we try to post a hidden service descriptor (reported by Peter
8386 - Fix a rare assert error when we've tried all intro points for
8387 a hidden service and we try fetching the service descriptor again:
8388 "Assertion conn->state != AP_CONN_STATE_RENDDESC_WAIT failed".
8389 - Setconf SocksListenAddress kills Tor if it fails to bind. Now back
8390 out and refuse the setconf if it would fail.
8391 - If you specify a relative torrc path and you set RunAsDaemon in
8392 your torrc, then it chdir()'s to the new directory. If you then
8393 HUP, it tries to load the new torrc location, fails, and exits.
8394 The fix: no longer allow a relative path to torrc when using -f.
8395 - Check for integer overflows in more places, when adding elements
8396 to smartlists. This could possibly prevent a buffer overflow
8397 on malicious huge inputs.
8399 o Security fixes, major:
8400 - When we're printing strings from the network, don't try to print
8401 non-printable characters. Now we're safer against shell escape
8402 sequence exploits, and also against attacks to fool users into
8403 misreading their logs.
8404 - Implement entry guards: automatically choose a handful of entry
8405 nodes and stick with them for all circuits. Only pick new guards
8406 when the ones you have are unsuitable, and if the old guards
8407 become suitable again, switch back. This will increase security
8408 dramatically against certain end-point attacks. The EntryNodes
8409 config option now provides some hints about which entry guards you
8410 want to use most; and StrictEntryNodes means to only use those.
8411 Fixes CVE-2006-0414.
8412 - Implement exit enclaves: if we know an IP address for the
8413 destination, and there's a running Tor server at that address
8414 which allows exit to the destination, then extend the circuit to
8415 that exit first. This provides end-to-end encryption and end-to-end
8416 authentication. Also, if the user wants a .exit address or enclave,
8417 use 4 hops rather than 3, and cannibalize a general circ for it
8419 - Obey our firewall options more faithfully:
8420 . If we can't get to a dirserver directly, try going via Tor.
8421 . Don't ever try to connect (as a client) to a place our
8422 firewall options forbid.
8423 . If we specify a proxy and also firewall options, obey the
8424 firewall options even when we're using the proxy: some proxies
8425 can only proxy to certain destinations.
8426 - Make clients regenerate their keys when their IP address changes.
8427 - For the OS X package's modified privoxy config file, comment
8428 out the "logfile" line so we don't log everything passed
8430 - Our TLS handshakes were generating a single public/private
8431 keypair for the TLS context, rather than making a new one for
8432 each new connection. Oops. (But we were still rotating them
8433 periodically, so it's not so bad.)
8434 - When we were cannibalizing a circuit with a particular exit
8435 node in mind, we weren't checking to see if that exit node was
8436 already present earlier in the circuit. Now we are.
8437 - Require server descriptors to list IPv4 addresses -- hostnames
8438 are no longer allowed. This also fixes potential vulnerabilities
8439 to servers providing hostnames as their address and then
8440 preferentially resolving them so they can partition users.
8441 - Our logic to decide if the OR we connected to was the right guy
8442 was brittle and maybe open to a mitm for invalid routers.
8444 o Security fixes, minor:
8445 - Adjust tor-spec.txt to parameterize cell and key lengths. Now
8446 Ian Goldberg can prove things about our handshake protocol more
8448 - Make directory authorities generate a separate "guard" flag to
8449 mean "would make a good entry guard". Clients now honor the
8450 is_guard flag rather than looking at is_fast or is_stable.
8451 - Try to list MyFamily elements by key, not by nickname, and warn
8452 if we've not heard of a server.
8453 - Start using RAND_bytes rather than RAND_pseudo_bytes from
8454 OpenSSL. Also, reseed our entropy every hour, not just at
8455 startup. And add entropy in 512-bit chunks, not 160-bit chunks.
8456 - Refuse server descriptors where the fingerprint line doesn't match
8457 the included identity key. Tor doesn't care, but other apps (and
8458 humans) might actually be trusting the fingerprint line.
8459 - We used to kill the circuit when we receive a relay command we
8460 don't recognize. Now we just drop that cell.
8461 - Fix a bug found by Lasse Overlier: when we were making internal
8462 circuits (intended to be cannibalized later for rendezvous and
8463 introduction circuits), we were picking them so that they had
8464 useful exit nodes. There was no need for this, and it actually
8465 aids some statistical attacks.
8466 - Start treating internal circuits and exit circuits separately.
8467 It's important to keep them separate because internal circuits
8468 have their last hops picked like middle hops, rather than like
8469 exit hops. So exiting on them will break the user's expectations.
8470 - Fix a possible way to DoS dirservers.
8471 - When the client asked for a rendezvous port that the hidden
8472 service didn't want to provide, we were sending an IP address
8473 back along with the end cell. Fortunately, it was zero. But stop
8476 o Packaging improvements:
8477 - Implement --with-libevent-dir option to ./configure. Improve
8478 search techniques to find libevent, and use those for openssl too.
8479 - Fix a couple of bugs in OpenSSL detection. Deal better when
8480 there are multiple SSLs installed with different versions.
8481 - Avoid warnings about machine/limits.h on Debian GNU/kFreeBSD.
8482 - On non-gcc compilers (e.g. Solaris's cc), use "-g -O" instead of
8484 - Make unit tests (and other invocations that aren't the real Tor)
8485 run without launching listeners, creating subdirectories, and so on.
8486 - The OS X installer was adding a symlink for tor_resolve but
8487 the binary was called tor-resolve (reported by Thomas Hardly).
8488 - Now we can target arch and OS in rpm builds (contributed by
8489 Phobos). Also make the resulting dist-rpm filename match the
8491 - Apply Matt Ghali's --with-syslog-facility patch to ./configure
8492 if you log to syslog and want something other than LOG_DAEMON.
8493 - Fix the torify (tsocks) config file to not use Tor for localhost
8495 - Start shipping socks-extensions.txt, tor-doc-unix.html,
8496 tor-doc-server.html, and stylesheet.css in the tarball.
8497 - Stop shipping tor-doc.html, INSTALL, and README in the tarball.
8498 They are useless now.
8499 - Add Peter Palfrader's contributed check-tor script. It lets you
8500 easily check whether a given server (referenced by nickname)
8501 is reachable by you.
8502 - Add BSD-style contributed startup script "rc.subr" from Peter
8505 o Directory improvements -- new directory protocol:
8506 - See tor/doc/dir-spec.txt for all the juicy details. Key points:
8507 - Authorities and caches publish individual descriptors (by
8508 digest, by fingerprint, by "all", and by "tell me yours").
8509 - Clients don't download or use the old directory anymore. Now they
8510 download network-statuses from the directory authorities, and
8511 fetch individual server descriptors as needed from mirrors.
8512 - Clients don't download descriptors of non-running servers.
8513 - Download descriptors by digest, not by fingerprint. Caches try to
8514 download all listed digests from authorities; clients try to
8515 download "best" digests from caches. This avoids partitioning
8516 and isolating attacks better.
8517 - Only upload a new server descriptor when options change, 18
8518 hours have passed, uptime is reset, or bandwidth changes a lot.
8519 - Directory authorities silently throw away new descriptors that
8520 haven't changed much if the timestamps are similar. We do this to
8521 tolerate older Tor servers that upload a new descriptor every 15
8522 minutes. (It seemed like a good idea at the time.)
8523 - Clients choose directory servers from the network status lists,
8524 not from their internal list of router descriptors. Now they can
8525 go to caches directly rather than needing to go to authorities
8526 to bootstrap the first set of descriptors.
8527 - When picking a random directory, prefer non-authorities if any
8529 - Add a new flag to network-status indicating whether the server
8530 can answer v2 directory requests too.
8531 - Directory mirrors now cache up to 16 unrecognized network-status
8532 docs, so new directory authorities will be cached too.
8533 - Stop parsing, storing, or using running-routers output (but
8534 mirrors still cache and serve it).
8535 - Clients consider a threshold of "versioning" directory authorities
8536 before deciding whether to warn the user that he's obsolete.
8537 - Authorities publish separate sorted lists of recommended versions
8538 for clients and for servers.
8539 - Change DirServers config line to note which dirs are v1 authorities.
8540 - Put nicknames on the DirServer line, so we can refer to them
8541 without requiring all our users to memorize their IP addresses.
8542 - Remove option when getting directory cache to see whether they
8543 support running-routers; they all do now. Replace it with one
8544 to see whether caches support v2 stuff.
8545 - Stop listing down or invalid nodes in the v1 directory. This
8546 reduces its bulk by about 1/3, and reduces load on mirrors.
8547 - Mirrors no longer cache the v1 directory as often.
8548 - If we as a directory mirror don't know of any v1 directory
8549 authorities, then don't try to cache any v1 directories.
8551 o Other directory improvements:
8552 - Add lefkada.eecs.harvard.edu and tor.dizum.com as fourth and
8553 fifth authoritative directory servers.
8554 - Directory authorities no longer require an open connection from
8555 a server to consider him "reachable". We need this change because
8556 when we add new directory authorities, old servers won't know not
8558 - Dir authorities now do their own external reachability testing
8559 of each server, and only list as running the ones they found to
8560 be reachable. We also send back warnings to the server's logs if
8561 it uploads a descriptor that we already believe is unreachable.
8562 - Spread the directory authorities' reachability testing over the
8563 entire testing interval, so we don't try to do 500 TLS's at once
8565 - Make the "stable" router flag in network-status be the median of
8566 the uptimes of running valid servers, and make clients pay
8567 attention to the network-status flags. Thus the cutoff adapts
8568 to the stability of the network as a whole, making IRC, IM, etc
8569 connections more reliable.
8570 - Make the v2 dir's "Fast" flag based on relative capacity, just
8571 like "Stable" is based on median uptime. Name everything in the
8572 top 7/8 Fast, and only the top 1/2 gets to be a Guard.
8573 - Retry directory requests if we fail to get an answer we like
8574 from a given dirserver (we were retrying before, but only if
8575 we fail to connect).
8576 - Return a robots.txt on our dirport to discourage google indexing.
8578 o Controller protocol improvements:
8579 - Revised controller protocol (version 1) that uses ascii rather
8580 than binary: tor/doc/control-spec.txt. Add supporting libraries
8581 in python and java and c# so you can use the controller from your
8582 applications without caring how our protocol works.
8583 - Allow the DEBUG controller event to work again. Mark certain log
8584 entries as "don't tell this to controllers", so we avoid cycles.
8585 - New controller function "getinfo accounting", to ask how
8586 many bytes we've used in this time period.
8587 - Add a "resetconf" command so you can set config options like
8588 AllowUnverifiedNodes and LongLivedPorts to "". Also, if you give
8589 a config option in the torrc with no value, then it clears it
8590 entirely (rather than setting it to its default).
8591 - Add a "getinfo config-file" to tell us where torrc is. Also
8592 expose guard nodes, config options/names.
8593 - Add a "quit" command (when when using the controller manually).
8594 - Add a new signal "newnym" to "change pseudonyms" -- that is, to
8595 stop using any currently-dirty circuits for new streams, so we
8596 don't link new actions to old actions. This also occurs on HUP
8598 - If we would close a stream early (e.g. it asks for a .exit that
8599 we know would refuse it) but the LeaveStreamsUnattached config
8600 option is set by the controller, then don't close it.
8601 - Add a new controller event type "authdir_newdescs" that allows
8602 controllers to get all server descriptors that were uploaded to
8603 a router in its role as directory authority.
8604 - New controller option "getinfo desc/all-recent" to fetch the
8605 latest server descriptor for every router that Tor knows about.
8606 - Fix the controller's "attachstream 0" command to treat conn like
8607 it just connected, doing address remapping, handling .exit and
8608 .onion idioms, and so on. Now we're more uniform in making sure
8609 that the controller hears about new and closing connections.
8610 - Permit transitioning from ORPort==0 to ORPort!=0, and back, from
8611 the controller. Also, rotate dns and cpu workers if the controller
8612 changes options that will affect them; and initialize the dns
8613 worker cache tree whether or not we start out as a server.
8614 - Add a new circuit purpose 'controller' to let the controller ask
8615 for a circuit that Tor won't try to use. Extend the "extendcircuit"
8616 controller command to let you specify the purpose if you're starting
8617 a new circuit. Add a new "setcircuitpurpose" controller command to
8618 let you change a circuit's purpose after it's been created.
8619 - Let the controller ask for "getinfo dir/server/foo" so it can ask
8620 directly rather than connecting to the dir port. "getinfo
8621 dir/status/foo" also works, but currently only if your DirPort
8623 - Let the controller tell us about certain router descriptors
8624 that it doesn't want Tor to use in circuits. Implement
8625 "setrouterpurpose" and modify "+postdescriptor" to do this.
8626 - If the controller's *setconf commands fail, collect an error
8627 message in a string and hand it back to the controller -- don't
8628 just tell them to go read their logs.
8630 o Scalability, resource management, and performance:
8631 - Fix a major load balance bug: we were round-robin reading in 16 KB
8632 chunks, and servers with bandwidthrate of 20 KB, while downloading
8633 a 600 KB directory, would starve their other connections. Now we
8634 try to be a bit more fair.
8635 - Be more conservative about whether to advertise our DirPort.
8636 The main change is to not advertise if we're running at capacity
8637 and either a) we could hibernate ever or b) our capacity is low
8638 and we're using a default DirPort.
8639 - We weren't cannibalizing circuits correctly for
8640 CIRCUIT_PURPOSE_C_ESTABLISH_REND and
8641 CIRCUIT_PURPOSE_S_ESTABLISH_INTRO, so we were being forced to
8642 build those from scratch. This should make hidden services faster.
8643 - Predict required circuits better, with an eye toward making hidden
8644 services faster on the service end.
8645 - Compress exit policies even more: look for duplicate lines and
8647 - Generate 18.0.0.0/8 address policy format in descs when we can;
8648 warn when the mask is not reducible to a bit-prefix.
8649 - There used to be two ways to specify your listening ports in a
8650 server descriptor: on the "router" line and with a separate "ports"
8651 line. Remove support for the "ports" line.
8652 - Reduce memory requirements in our structs by changing the order
8653 of fields. Replace balanced trees with hash tables. Inline
8654 bottleneck smartlist functions. Add a "Map from digest to void*"
8655 abstraction so we can do less hex encoding/decoding, and use it
8656 in router_get_by_digest(). Many other CPU and memory improvements.
8657 - Allow tor_gzip_uncompress to extract as much as possible from
8658 truncated compressed data. Try to extract as many
8659 descriptors as possible from truncated http responses (when
8660 purpose is DIR_PURPOSE_FETCH_ROUTERDESC).
8661 - Make circ->onionskin a pointer, not a static array. moria2 was using
8662 125000 circuit_t's after it had been up for a few weeks, which
8663 translates to 20+ megs of wasted space.
8664 - The private half of our EDH handshake keys are now chosen out
8665 of 320 bits, not 1024 bits. (Suggested by Ian Goldberg.)
8666 - Stop doing the complex voodoo overkill checking for insecure
8667 Diffie-Hellman keys. Just check if it's in [2,p-2] and be happy.
8668 - Do round-robin writes for TLS of at most 16 kB per write. This
8669 might be more fair on loaded Tor servers.
8670 - Do not use unaligned memory access on alpha, mips, or mipsel.
8671 It *works*, but is very slow, so we treat them as if it doesn't.
8673 o Other bugfixes and improvements:
8674 - Start storing useful information to $DATADIR/state, so we can
8675 remember things across invocations of Tor. Retain unrecognized
8676 lines so we can be forward-compatible, and write a TorVersion line
8677 so we can be backward-compatible.
8678 - If ORPort is set, Address is not explicitly set, and our hostname
8679 resolves to a private IP address, try to use an interface address
8680 if it has a public address. Now Windows machines that think of
8681 themselves as localhost can guess their address.
8682 - Regenerate our local descriptor if it's dirty and we try to use
8683 it locally (e.g. if it changes during reachability detection).
8684 This was causing some Tor servers to keep publishing the same
8685 initial descriptor forever.
8686 - Tor servers with dynamic IP addresses were needing to wait 18
8687 hours before they could start doing reachability testing using
8688 the new IP address and ports. This is because they were using
8689 the internal descriptor to learn what to test, yet they were only
8690 rebuilding the descriptor once they decided they were reachable.
8691 - It turns out we couldn't bootstrap a network since we added
8692 reachability detection in 0.1.0.1-rc. Good thing the Tor network
8693 has never gone down. Add an AssumeReachable config option to let
8694 servers and authorities bootstrap. When we're trying to build a
8695 high-uptime or high-bandwidth circuit but there aren't enough
8696 suitable servers, try being less picky rather than simply failing.
8697 - Newly bootstrapped Tor networks couldn't establish hidden service
8698 circuits until they had nodes with high uptime. Be more tolerant.
8699 - Really busy servers were keeping enough circuits open on stable
8700 connections that they were wrapping around the circuit_id
8701 space. (It's only two bytes.) This exposed a bug where we would
8702 feel free to reuse a circuit_id even if it still exists but has
8703 been marked for close. Try to fix this bug. Some bug remains.
8704 - When we fail to bind or listen on an incoming or outgoing
8705 socket, we now close it before refusing, rather than just
8706 leaking it. (Thanks to Peter Palfrader for finding.)
8707 - Fix a file descriptor leak in start_daemon().
8708 - On Windows, you can't always reopen a port right after you've
8709 closed it. So change retry_listeners() to only close and re-open
8710 ports that have changed.
8711 - Workaround a problem with some http proxies that refuse GET
8712 requests that specify "Content-Length: 0". Reported by Adrian.
8713 - Recover better from TCP connections to Tor servers that are
8714 broken but don't tell you (it happens!); and rotate TLS
8715 connections once a week.
8716 - Fix a scary-looking but apparently harmless bug where circuits
8717 would sometimes start out in state CIRCUIT_STATE_OR_WAIT at
8718 servers, and never switch to state CIRCUIT_STATE_OPEN.
8719 - Check for even more Windows version flags when writing the platform
8720 string in server descriptors, and note any we don't recognize.
8721 - Add reasons to DESTROY and RELAY_TRUNCATED cells, so clients can
8722 get a better idea of why their circuits failed. Not used yet.
8723 - Add TTLs to RESOLVED, CONNECTED, and END_REASON_EXITPOLICY cells.
8724 We don't use them yet, but maybe one day our DNS resolver will be
8725 able to discover them.
8726 - Let people type "tor --install" as well as "tor -install" when they
8727 want to make it an NT service.
8728 - Looks like we were never delivering deflated (i.e. compressed)
8729 running-routers lists, even when asked. Oops.
8730 - We were leaking some memory every time the client changed IPs.
8731 - Clean up more of the OpenSSL memory when exiting, so we can detect
8732 memory leaks better.
8733 - Never call free() on tor_malloc()d memory. This will help us
8734 use dmalloc to detect memory leaks.
8735 - Some Tor servers process billions of cells per day. These
8736 statistics are now uint64_t's.
8737 - Check [X-]Forwarded-For headers in HTTP requests when generating
8738 log messages. This lets people run dirservers (and caches) behind
8739 Apache but still know which IP addresses are causing warnings.
8740 - Fix minor integer overflow in calculating when we expect to use up
8741 our bandwidth allocation before hibernating.
8742 - Lower the minimum required number of file descriptors to 1000,
8743 so we can have some overhead for Valgrind on Linux, where the
8744 default ulimit -n is 1024.
8745 - Stop writing the "router.desc" file, ever. Nothing uses it anymore,
8746 and its existence is confusing some users.
8748 o Config option fixes:
8749 - Add a new config option ExitPolicyRejectPrivate which defaults
8750 to on. Now all exit policies will begin with rejecting private
8751 addresses, unless the server operator explicitly turns it off.
8752 - Bump the default bandwidthrate to 3 MB, and burst to 6 MB.
8753 - Add new ReachableORAddresses and ReachableDirAddresses options
8754 that understand address policies. FascistFirewall is now a synonym
8755 for "ReachableORAddresses *:443", "ReachableDirAddresses *:80".
8756 - Start calling it FooListenAddress rather than FooBindAddress,
8757 since few of our users know what it means to bind an address
8759 - If the user gave Tor an odd number of command-line arguments,
8760 we were silently ignoring the last one. Now we complain and fail.
8761 This wins the oldest-bug prize -- this bug has been present since
8762 November 2002, as released in Tor 0.0.0.
8763 - If you write "HiddenServicePort 6667 127.0.0.1 6668" in your
8764 torrc rather than "HiddenServicePort 6667 127.0.0.1:6668",
8765 it would silently ignore the 6668.
8766 - If we get a linelist or linelist_s config option from the torrc,
8767 e.g. ExitPolicy, and it has no value, warn and skip rather than
8768 silently resetting it to its default.
8769 - Setconf was appending items to linelists, not clearing them.
8770 - Add MyFamily to torrc.sample in the server section, so operators
8771 will be more likely to learn that it exists.
8772 - Make ContactInfo mandatory for authoritative directory servers.
8773 - MaxConn has been obsolete for a while now. Document the ConnLimit
8774 config option, which is a *minimum* number of file descriptors
8775 that must be available else Tor refuses to start.
8776 - Get rid of IgnoreVersion undocumented config option, and make us
8777 only warn, never exit, when we're running an obsolete version.
8778 - Make MonthlyAccountingStart config option truly obsolete now.
8779 - Correct the man page entry on TrackHostExitsExpire.
8780 - Let directory authorities start even if they don't specify an
8781 Address config option.
8782 - Change "AllowUnverifiedNodes" to "AllowInvalidNodes", to
8783 reflect the updated flags in our v2 dir protocol.
8785 o Config option features:
8786 - Add a new config option FastFirstHopPK (on by default) so clients
8787 do a trivial crypto handshake for their first hop, since TLS has
8788 already taken care of confidentiality and authentication.
8789 - Let the user set ControlListenAddress in the torrc. This can be
8790 dangerous, but there are some cases (like a secured LAN) where it
8792 - New config options to help controllers: FetchServerDescriptors
8793 and FetchHidServDescriptors for whether to fetch server
8794 info and hidserv info or let the controller do it, and
8795 PublishServerDescriptor and PublishHidServDescriptors.
8796 - Also let the controller set the __AllDirActionsPrivate config
8797 option if you want all directory fetches/publishes to happen via
8798 Tor (it assumes your controller bootstraps your circuits).
8799 - Add "HardwareAccel" config option: support for crypto hardware
8800 accelerators via OpenSSL. Off by default, until we find somebody
8801 smart who can test it for us. (It appears to produce seg faults
8802 in at least some cases.)
8803 - New config option "AuthDirRejectUnlisted" for directory authorities
8804 as a panic button: if we get flooded with unusable servers we can
8805 revert to only listing servers in the approved-routers file.
8806 - Directory authorities can now reject/invalidate by key and IP,
8807 with the config options "AuthDirInvalid" and "AuthDirReject", or
8808 by marking a fingerprint as "!reject" or "!invalid" (as its
8809 nickname) in the approved-routers file. This is useful since
8810 currently we automatically list servers as running and usable
8811 even if we know they're jerks.
8812 - Add a new config option TestSocks so people can see whether their
8813 applications are using socks4, socks4a, socks5-with-ip, or
8814 socks5-with-fqdn. This way they don't have to keep mucking
8815 with tcpdump and wondering if something got cached somewhere.
8816 - Add "private:*" as an alias in configuration for policies. Now
8817 you can simplify your exit policy rather than needing to list
8818 every single internal or nonroutable network space.
8819 - Accept "private:*" in routerdesc exit policies; not generated yet
8820 because older Tors do not understand it.
8821 - Add configuration option "V1AuthoritativeDirectory 1" which
8822 moria1, moria2, and tor26 have set.
8823 - Implement an option, VirtualAddrMask, to set which addresses
8824 get handed out in response to mapaddress requests. This works
8825 around a bug in tsocks where 127.0.0.0/8 is never socksified.
8826 - Add a new config option FetchUselessDescriptors, off by default,
8827 for when you plan to run "exitlist" on your client and you want
8828 to know about even the non-running descriptors.
8829 - SocksTimeout: How long do we let a socks connection wait
8830 unattached before we fail it?
8831 - CircuitBuildTimeout: Cull non-open circuits that were born
8832 at least this many seconds ago.
8833 - CircuitIdleTimeout: Cull open clean circuits that were born
8834 at least this many seconds ago.
8835 - New config option SafeSocks to reject all application connections
8836 using unsafe socks protocols. Defaults to off.
8838 o Improved and clearer log messages:
8839 - Reduce clutter in server logs. We're going to try to make
8840 them actually usable now. New config option ProtocolWarnings that
8841 lets you hear about how _other Tors_ are breaking the protocol. Off
8843 - Divide log messages into logging domains. Once we put some sort
8844 of interface on this, it will let people looking at more verbose
8845 log levels specify the topics they want to hear more about.
8846 - Log server fingerprint on startup, so new server operators don't
8847 have to go hunting around their filesystem for it.
8848 - Provide dire warnings to any users who set DirServer manually;
8849 move it out of torrc.sample and into torrc.complete.
8850 - Make the log message less scary when all the dirservers are
8851 temporarily unreachable.
8852 - When tor_socketpair() fails in Windows, give a reasonable
8853 Windows-style errno back.
8854 - Improve tor_gettimeofday() granularity on windows.
8855 - We were printing the number of idle dns workers incorrectly when
8857 - Handle duplicate lines in approved-routers files without warning.
8858 - We were whining about using socks4 or socks5-with-local-lookup
8859 even when it's an IP address in the "virtual" range we designed
8860 exactly for this case.
8861 - Check for named servers when looking them up by nickname;
8862 warn when we're calling a non-named server by its nickname;
8863 don't warn twice about the same name.
8864 - Downgrade the dirserver log messages when whining about
8866 - Correct "your server is reachable" log entries to indicate that
8867 it was self-testing that told us so.
8868 - If we're trying to be a Tor server and running Windows 95/98/ME
8869 as a server, explain that we'll likely crash.
8870 - Provide a more useful warn message when our onion queue gets full:
8871 the CPU is too slow or the exit policy is too liberal.
8872 - Don't warn when we receive a 503 from a dirserver/cache -- this
8873 will pave the way for them being able to refuse if they're busy.
8874 - When we fail to bind a listener, try to provide a more useful
8875 log message: e.g., "Is Tor already running?"
8876 - Only start testing reachability once we've established a
8877 circuit. This will make startup on dir authorities less noisy.
8878 - Don't try to upload hidden service descriptors until we have
8879 established a circuit.
8880 - Tor didn't warn when it failed to open a log file.
8881 - Warn when listening on a public address for socks. We suspect a
8882 lot of people are setting themselves up as open socks proxies,
8883 and they have no idea that jerks on the Internet are using them,
8884 since they simply proxy the traffic into the Tor network.
8885 - Give a useful message when people run Tor as the wrong user,
8886 rather than telling them to start chowning random directories.
8887 - Fix a harmless bug that was causing Tor servers to log
8888 "Got an end because of misc error, but we're not an AP. Closing."
8889 - Fix wrong log message when you add a "HiddenServiceNodes" config
8890 line without any HiddenServiceDir line (reported by Chris Thomas).
8891 - Directory authorities now stop whining so loudly about bad
8892 descriptors that they fetch from other dirservers. So when there's
8893 a log complaint, it's for sure from a freshly uploaded descriptor.
8894 - When logging via syslog, include the pid whenever we provide
8895 a log entry. Suggested by Todd Fries.
8896 - When we're shutting down and we do something like try to post a
8897 server descriptor or rendezvous descriptor, don't complain that
8898 we seem to be unreachable. Of course we are, we're shutting down.
8899 - Change log line for unreachability to explicitly suggest /etc/hosts
8900 as the culprit. Also make it clearer what IP address and ports we're
8901 testing for reachability.
8902 - Put quotes around user-supplied strings when logging so users are
8903 more likely to realize if they add bad characters (like quotes)
8905 - NT service patch from Matt Edman to improve error messages on Win32.
8908 Changes in version 0.1.0.17 - 2006-02-17
8909 o Crash bugfixes on 0.1.0.x:
8910 - When servers with a non-zero DirPort came out of hibernation,
8911 sometimes they would trigger an assert.
8913 o Other important bugfixes:
8914 - On platforms that don't have getrlimit (like Windows), we were
8915 artificially constraining ourselves to a max of 1024
8916 connections. Now just assume that we can handle as many as 15000
8917 connections. Hopefully this won't cause other problems.
8919 o Backported features:
8920 - When we're a server, a client asks for an old-style directory,
8921 and our write bucket is empty, don't give it to him. This way
8922 small servers can continue to serve the directory *sometimes*,
8923 without getting overloaded.
8924 - Whenever you get a 503 in response to a directory fetch, try
8925 once more. This will become important once servers start sending
8926 503's whenever they feel busy.
8927 - Fetch a new directory every 120 minutes, not every 40 minutes.
8928 Now that we have hundreds of thousands of users running the old
8929 directory algorithm, it's starting to hurt a lot.
8930 - Bump up the period for forcing a hidden service descriptor upload
8931 from 20 minutes to 1 hour.
8934 Changes in version 0.1.0.16 - 2006-01-02
8935 o Crash bugfixes on 0.1.0.x:
8936 - On Windows, build with a libevent patch from "I-M Weasel" to avoid
8937 corrupting the heap, losing FDs, or crashing when we need to resize
8938 the fd_sets. (This affects the Win32 binaries, not Tor's sources.)
8939 - It turns out sparc64 platforms crash on unaligned memory access
8940 too -- so detect and avoid this.
8941 - Handle truncated compressed data correctly (by detecting it and
8943 - Fix possible-but-unlikely free(NULL) in control.c.
8944 - When we were closing connections, there was a rare case that
8945 stomped on memory, triggering seg faults and asserts.
8946 - Avoid potential infinite recursion when building a descriptor. (We
8947 don't know that it ever happened, but better to fix it anyway.)
8948 - We were neglecting to unlink marked circuits from soon-to-close OR
8949 connections, which caused some rare scribbling on freed memory.
8950 - Fix a memory stomping race bug when closing the joining point of two
8951 rendezvous circuits.
8952 - Fix an assert in time parsing found by Steven Murdoch.
8954 o Other bugfixes on 0.1.0.x:
8955 - When we're doing reachability testing, provide more useful log
8956 messages so the operator knows what to expect.
8957 - Do not check whether DirPort is reachable when we are suppressing
8958 advertising it because of hibernation.
8959 - When building with -static or on Solaris, we sometimes needed -ldl.
8960 - One of the dirservers (tor26) changed its IP address.
8961 - When we're deciding whether a stream has enough circuits around
8962 that can handle it, count the freshly dirty ones and not the ones
8963 that are so dirty they won't be able to handle it.
8964 - When we're expiring old circuits, we had a logic error that caused
8965 us to close new rendezvous circuits rather than old ones.
8966 - Give a more helpful log message when you try to change ORPort via
8967 the controller: you should upgrade Tor if you want that to work.
8968 - We were failing to parse Tor versions that start with "Tor ".
8969 - Tolerate faulty streams better: when a stream fails for reason
8970 exitpolicy, stop assuming that the router is lying about his exit
8971 policy. When a stream fails for reason misc, allow it to retry just
8972 as if it was resolvefailed. When a stream has failed three times,
8973 reset its failure count so we can try again and get all three tries.
8976 Changes in version 0.1.0.15 - 2005-09-23
8977 o Bugfixes on 0.1.0.x:
8978 - Reject ports 465 and 587 (spam targets) in default exit policy.
8979 - Don't crash when we don't have any spare file descriptors and we
8980 try to spawn a dns or cpu worker.
8981 - Get rid of IgnoreVersion undocumented config option, and make us
8982 only warn, never exit, when we're running an obsolete version.
8983 - Don't try to print a null string when your server finds itself to
8984 be unreachable and the Address config option is empty.
8985 - Make the numbers in read-history and write-history into uint64s,
8986 so they don't overflow and publish negatives in the descriptor.
8987 - Fix a minor memory leak in smartlist_string_remove().
8988 - We were only allowing ourselves to upload a server descriptor at
8989 most every 20 minutes, even if it changed earlier than that.
8990 - Clean up log entries that pointed to old URLs.
8993 Changes in version 0.1.0.14 - 2005-08-08
8994 o Bugfixes on 0.1.0.x:
8995 - Fix the other half of the bug with crypto handshakes
8997 - Fix an assert trigger if you send a 'signal term' via the
8998 controller when it's listening for 'event info' messages.
9001 Changes in version 0.1.0.13 - 2005-08-04
9002 o Bugfixes on 0.1.0.x:
9003 - Fix a critical bug in the security of our crypto handshakes.
9004 - Fix a size_t underflow in smartlist_join_strings2() that made
9005 it do bad things when you hand it an empty smartlist.
9006 - Fix Windows installer to ship Tor license (thanks to Aphex for
9007 pointing out this oversight) and put a link to the doc directory
9009 - Explicitly set no-unaligned-access for sparc: it turns out the
9010 new gcc's let you compile broken code, but that doesn't make it
9014 Changes in version 0.1.0.12 - 2005-07-18
9015 o New directory servers:
9016 - tor26 has changed IP address.
9018 o Bugfixes on 0.1.0.x:
9019 - Fix a possible double-free in tor_gzip_uncompress().
9020 - When --disable-threads is set, do not search for or link against
9022 - Don't trigger an assert if an authoritative directory server
9023 claims its dirport is 0.
9024 - Fix bug with removing Tor as an NT service: some people were
9025 getting "The service did not return an error." Thanks to Matt
9029 Changes in version 0.1.0.11 - 2005-06-30
9030 o Bugfixes on 0.1.0.x:
9031 - Fix major security bug: servers were disregarding their
9032 exit policies if clients behaved unexpectedly.
9033 - Make OS X init script check for missing argument, so we don't
9034 confuse users who invoke it incorrectly.
9035 - Fix a seg fault in "tor --hash-password foo".
9036 - The MAPADDRESS control command was broken.
9039 Changes in version 0.1.0.10 - 2005-06-14
9041 - Make NT services work and start on startup on Win32 (based on
9042 patch by Matt Edman). See the FAQ entry for details.
9043 - Make 'platform' string in descriptor more accurate for Win32
9044 servers, so it's not just "unknown platform".
9045 - REUSEADDR on normal platforms means you can rebind to the port
9046 right after somebody else has let it go. But REUSEADDR on Win32
9047 means you can bind to the port _even when somebody else already
9048 has it bound_! So, don't do that on Win32.
9049 - Clean up the log messages when starting on Win32 with no config
9051 - Allow seeding the RNG on Win32 even when you're not running as
9052 Administrator. If seeding the RNG on Win32 fails, quit.
9054 o Assert / crash bugs:
9055 - Refuse relay cells that claim to have a length larger than the
9056 maximum allowed. This prevents a potential attack that could read
9057 arbitrary memory (e.g. keys) from an exit server's process
9059 - If unofficial Tor clients connect and send weird TLS certs, our
9060 Tor server triggers an assert. Stop asserting, and start handling
9061 TLS errors better in other situations too.
9062 - Fix a race condition that can trigger an assert when we have a
9063 pending create cell and an OR connection attempt fails.
9066 - Use pthreads for worker processes rather than forking. This was
9067 forced because when we forked, we ended up wasting a lot of
9068 duplicate ram over time.
9069 - Also switch to foo_r versions of some library calls to allow
9070 reentry and threadsafeness.
9071 - Implement --disable-threads configure option. Disable threads on
9072 netbsd and openbsd by default, because they have no reentrant
9073 resolver functions (!), and on solaris since it has other
9075 - Fix possible bug on threading platforms (e.g. win32) which was
9076 leaking a file descriptor whenever a cpuworker or dnsworker died.
9077 - Fix a minor memory leak when somebody establishes an introduction
9078 point at your Tor server.
9079 - Fix possible memory leak in tor_lookup_hostname(). (Thanks to
9081 - Add ./configure --with-dmalloc option, to track memory leaks.
9082 - And try to free all memory on closing, so we can detect what
9085 o Protocol correctness:
9086 - When we've connected to an OR and handshaked but didn't like
9087 the result, we were closing the conn without sending destroy
9088 cells back for pending circuits. Now send those destroys.
9089 - Start sending 'truncated' cells back rather than destroy cells
9090 if the circuit closes in front of you. This means we won't have
9091 to abandon partially built circuits.
9092 - Handle changed router status correctly when dirserver reloads
9093 fingerprint file. We used to be dropping all unverified descriptors
9094 right then. The bug was hidden because we would immediately
9095 fetch a directory from another dirserver, which would include the
9096 descriptors we just dropped.
9097 - Revise tor-spec to add more/better stream end reasons.
9098 - Revise all calls to connection_edge_end to avoid sending 'misc',
9099 and to take errno into account where possible.
9100 - Client now retries when streams end early for 'hibernating' or
9101 'resource limit' reasons, rather than failing them.
9102 - Try to be more zealous about calling connection_edge_end when
9103 things go bad with edge conns in connection.c.
9105 o Robustness improvements:
9106 - Better handling for heterogeneous / unreliable nodes:
9107 - Annotate circuits with whether they aim to contain high uptime
9108 nodes and/or high capacity nodes. When building circuits, choose
9110 - This means that every single node in an intro rend circuit,
9111 not just the last one, will have a minimum uptime.
9112 - New config option LongLivedPorts to indicate application streams
9113 that will want high uptime circuits.
9114 - Servers reset uptime when a dir fetch entirely fails. This
9115 hopefully reflects stability of the server's network connectivity.
9116 - If somebody starts his tor server in Jan 2004 and then fixes his
9117 clock, don't make his published uptime be a year.
9118 - Reset published uptime when we wake up from hibernation.
9119 - Introduce a notion of 'internal' circs, which are chosen without
9120 regard to the exit policy of the last hop. Intro and rendezvous
9121 circs must be internal circs, to avoid leaking information. Resolve
9122 and connect streams can use internal circs if they want.
9123 - New circuit pooling algorithm: keep track of what destination ports
9124 we've used recently (start out assuming we'll want to use 80), and
9125 make sure to have enough circs around to satisfy these ports. Also
9126 make sure to have 2 internal circs around if we've required internal
9127 circs lately (and with high uptime if we've seen that lately too).
9128 - Turn addr_policy_compare from a tristate to a quadstate; this should
9129 help address our "Ah, you allow 1.2.3.4:80. You are a good choice
9130 for google.com" problem.
9131 - When a client asks us for a dir mirror and we don't have one,
9132 launch an attempt to get a fresh one.
9133 - First cut at support for "create-fast" cells. Clients can use
9134 these when extending to their first hop, since the TLS already
9135 provides forward secrecy and authentication. Not enabled on
9138 o Reachability testing.
9139 - Your Tor server will automatically try to see if its ORPort and
9140 DirPort are reachable from the outside, and it won't upload its
9141 descriptor until it decides at least ORPort is reachable (when
9142 DirPort is not yet found reachable, publish it as zero).
9143 - When building testing circs for ORPort testing, use only
9144 high-bandwidth nodes, so fewer circuits fail.
9145 - Notice when our IP changes, and reset stats/uptime/reachability.
9146 - Authdirservers don't do ORPort reachability detection, since
9147 they're in clique mode, so it will be rare to find a server not
9148 already connected to them.
9149 - Authdirservers now automatically approve nodes running 0.1.0.2-rc
9153 - Now we allow two unverified servers with the same nickname
9154 but different keys. But if a nickname is verified, only that
9155 nickname+key are allowed.
9156 - If you're an authdirserver connecting to an address:port,
9157 and it's not the OR you were expecting, forget about that
9158 descriptor. If he *was* the one you were expecting, then forget
9159 about all other descriptors for that address:port.
9160 - Allow servers to publish descriptors from 12 hours in the future.
9161 Corollary: only whine about clock skew from the dirserver if
9162 he's a trusted dirserver (since now even verified servers could
9163 have quite wrong clocks).
9164 - Require servers that use the default dirservers to have public IP
9165 addresses. We have too many servers that are configured with private
9166 IPs and their admins never notice the log entries complaining that
9167 their descriptors are being rejected.
9169 o Efficiency improvements:
9170 - Use libevent. Now we can use faster async cores (like epoll, kpoll,
9171 and /dev/poll), and hopefully work better on Windows too.
9172 - Apple's OS X 10.4.0 ships with a broken kqueue API, and using
9173 kqueue on 10.3.9 causes kernel panics. Don't use kqueue on OS X.
9174 - Find libevent even if it's hiding in /usr/local/ and your
9175 CFLAGS and LDFLAGS don't tell you to look there.
9176 - Be able to link with libevent as a shared library (the default
9177 after 1.0d), even if it's hiding in /usr/local/lib and even
9178 if you haven't added /usr/local/lib to your /etc/ld.so.conf,
9179 assuming you're running gcc. Otherwise fail and give a useful
9181 - Switch to a new buffer management algorithm, which tries to avoid
9182 reallocing and copying quite as much. In first tests it looks like
9183 it uses *more* memory on average, but less cpu.
9184 - Switch our internal buffers implementation to use a ring buffer,
9185 to hopefully improve performance for fast servers a lot.
9186 - Reenable the part of the code that tries to flush as soon as an
9187 OR outbuf has a full TLS record available. Perhaps this will make
9188 OR outbufs not grow as huge except in rare cases, thus saving lots
9189 of CPU time plus memory.
9190 - Improve performance for dirservers: stop re-parsing the whole
9191 directory every time you regenerate it.
9192 - Keep a big splay tree of (circid,orconn)->circuit mappings to make
9193 it much faster to look up a circuit for each relay cell.
9194 - Remove most calls to assert_all_pending_dns_resolves_ok(),
9195 since they're eating our cpu on exit nodes.
9196 - Stop wasting time doing a case insensitive comparison for every
9197 dns name every time we do any lookup. Canonicalize the names to
9198 lowercase when you first see them.
9201 - Handle unavailable hidden services better. Handle slow or busy
9202 hidden services better.
9203 - Cannibalize GENERAL circs to be C_REND, C_INTRO, S_INTRO, and S_REND
9204 circ as necessary, if there are any completed ones lying around
9205 when we try to launch one.
9206 - Make hidden services try to establish a rendezvous for 30 seconds
9207 after fetching the descriptor, rather than for n (where n=3)
9208 attempts to build a circuit.
9209 - Adjust maximum skew and age for rendezvous descriptors: let skew
9210 be 48 hours rather than 90 minutes.
9211 - Reject malformed .onion addresses rather then passing them on as
9212 normal web requests.
9215 - More Tor controller support. See
9216 http://tor.eff.org/doc/control-spec.txt for all the new features,
9217 including signals to emulate unix signals from any platform;
9218 redirectstream; extendcircuit; mapaddress; getinfo; postdescriptor;
9219 closestream; closecircuit; etc.
9220 - Encode hashed controller passwords in hex instead of base64,
9221 to make it easier to write controllers.
9222 - Revise control spec and implementation to allow all log messages to
9223 be sent to controller with their severities intact (suggested by
9224 Matt Edman). Disable debug-level logs while delivering a debug-level
9225 log to the controller, to prevent loop. Update TorControl to handle
9226 new log event types.
9228 o New config options/defaults:
9229 - Begin scrubbing sensitive strings from logs by default. Turn off
9230 the config option SafeLogging if you need to do debugging.
9231 - New exit policy: accept most low-numbered ports, rather than
9232 rejecting most low-numbered ports.
9233 - Put a note in the torrc about abuse potential with the default
9235 - Add support for CONNECTing through https proxies, with "HttpsProxy"
9237 - Add HttpProxyAuthenticator and HttpsProxyAuthenticator support
9238 based on patch from Adam Langley (basic auth only).
9239 - Bump the default BandwidthRate from 1 MB to 2 MB, to accommodate
9240 the fast servers that have been joining lately. (Clients are now
9241 willing to load balance over up to 2 MB of advertised bandwidth
9243 - New config option MaxAdvertisedBandwidth which lets you advertise
9244 a low bandwidthrate (to not attract as many circuits) while still
9245 allowing a higher bandwidthrate in reality.
9246 - Require BandwidthRate to be at least 20kB/s for servers.
9247 - Add a NoPublish config option, so you can be a server (e.g. for
9248 testing running Tor servers in other Tor networks) without
9249 publishing your descriptor to the primary dirservers.
9250 - Add a new AddressMap config directive to rewrite incoming socks
9251 addresses. This lets you, for example, declare an implicit
9252 required exit node for certain sites.
9253 - Add a new TrackHostExits config directive to trigger addressmaps
9254 for certain incoming socks addresses -- for sites that break when
9255 your exit keeps changing (based on patch from Mike Perry).
9256 - Split NewCircuitPeriod option into NewCircuitPeriod (30 secs),
9257 which describes how often we retry making new circuits if current
9258 ones are dirty, and MaxCircuitDirtiness (10 mins), which describes
9259 how long we're willing to make use of an already-dirty circuit.
9260 - Change compiled-in SHUTDOWN_WAIT_LENGTH from a fixed 30 secs to
9261 a config option "ShutdownWaitLength" (when using kill -INT on
9263 - Fix an edge case in parsing config options: if they say "--"
9264 on the commandline, it's not a config option (thanks weasel).
9265 - New config option DirAllowPrivateAddresses for authdirservers.
9266 Now by default they refuse router descriptors that have non-IP or
9267 private-IP addresses.
9268 - Change DirFetchPeriod/StatusFetchPeriod to have a special "Be
9269 smart" default value: low for servers and high for clients.
9270 - Some people were putting "Address " in their torrc, and they had
9271 a buggy resolver that resolved " " to 0.0.0.0. Oops.
9272 - If DataDir is ~/.tor, and that expands to /.tor, then default to
9273 LOCALSTATEDIR/tor instead.
9274 - Implement --verify-config command-line option to check if your torrc
9275 is valid without actually launching Tor.
9277 o Logging improvements:
9278 - When dirservers refuse a server descriptor, we now log its
9279 contactinfo, platform, and the poster's IP address.
9280 - Only warn once per nickname from add_nickname_list_to_smartlist()
9281 per failure, so an entrynode or exitnode choice that's down won't
9283 - When we're connecting to an OR and he's got a different nickname/key
9284 than we were expecting, only complain loudly if we're an OP or a
9285 dirserver. Complaining loudly to the OR admins just confuses them.
9286 - Whine at you if you're a server and you don't set your contactinfo.
9287 - Warn when exit policy implicitly allows local addresses.
9288 - Give a better warning when some other server advertises an
9289 ORPort that is actually an apache running ssl.
9290 - If we get an incredibly skewed timestamp from a dirserver mirror
9291 that isn't a verified OR, don't warn -- it's probably him that's
9293 - When a dirserver causes you to give a warn, mention which dirserver
9295 - Initialize libevent later in the startup process, so the logs are
9296 already established by the time we start logging libevent warns.
9297 - Use correct errno on win32 if libevent fails.
9298 - Check and warn about known-bad/slow libevent versions.
9299 - Stop warning about sigpipes in the logs. We're going to
9300 pretend that getting these occassionally is normal and fine.
9302 o New contrib scripts:
9303 - New experimental script tor/contrib/exitlist: a simple python
9304 script to parse directories and find Tor nodes that exit to listed
9306 - New experimental script tor/contrib/ExerciseServer.py (needs more
9307 work) that uses the controller interface to build circuits and
9308 fetch pages over them. This will help us bootstrap servers that
9309 have lots of capacity but haven't noticed it yet.
9310 - New experimental script tor/contrib/PathDemo.py (needs more work)
9311 that uses the controller interface to let you choose whole paths
9313 "<hostname>.<path,separated by dots>.<length of path>.path"
9314 - New contributed script "privoxy-tor-toggle" to toggle whether
9315 Privoxy uses Tor. Seems to be configured for Debian by default.
9316 - Have torctl.in/tor.sh.in check for location of su binary (needed
9320 - chdir() to your datadirectory at the *end* of the daemonize process,
9321 not the beginning. This was a problem because the first time you
9322 run tor, if your datadir isn't there, and you have runasdaemon set
9323 to 1, it will try to chdir to it before it tries to create it. Oops.
9324 - Fix several double-mark-for-close bugs, e.g. where we were finding
9325 a conn for a cell even if that conn is already marked for close.
9326 - Stop most cases of hanging up on a socks connection without sending
9328 - Fix a bug in the RPM package: set home directory for _tor to
9329 something more reasonable when first installing.
9330 - Stop putting nodename in the Platform string in server descriptors.
9331 It doesn't actually help, and it is confusing/upsetting some people.
9332 - When using preferred entry or exit nodes, ignore whether the
9333 circuit wants uptime or capacity. They asked for the nodes, they
9335 - Tie MAX_DIR_SIZE to MAX_BUF_SIZE, so now directory sizes won't get
9336 artificially capped at 500kB.
9337 - Cache local dns resolves correctly even when they're .exit
9339 - If we're hibernating and we get a SIGINT, exit immediately.
9340 - tor-resolve requests were ignoring .exit if there was a working circuit
9341 they could use instead.
9342 - Pay more attention to the ClientOnly config option.
9343 - Resolve OS X installer bugs: stop claiming to be 0.0.9.2 in certain
9344 installer screens; and don't put stuff into StartupItems unless
9345 the user asks you to.
9348 - Rewrite address "serifos.exit" to "externalIP.serifos.exit"
9349 rather than just rejecting it.
9350 - If our clock jumps forward by 100 seconds or more, assume something
9351 has gone wrong with our network and abandon all not-yet-used circs.
9352 - When an application is using socks5, give him the whole variety of
9353 potential socks5 responses (connect refused, host unreachable, etc),
9354 rather than just "success" or "failure".
9355 - A more sane version numbering system. See
9356 http://tor.eff.org/cvs/tor/doc/version-spec.txt for details.
9357 - Change version parsing logic: a version is "obsolete" if it is not
9358 recommended and (1) there is a newer recommended version in the
9359 same series, or (2) there are no recommended versions in the same
9360 series, but there are some recommended versions in a newer series.
9361 A version is "new" if it is newer than any recommended version in
9363 - Report HTTP reasons to client when getting a response from directory
9364 servers -- so you can actually know what went wrong.
9365 - Reject odd-looking addresses at the client (e.g. addresses that
9366 contain a colon), rather than having the server drop them because
9368 - Stop publishing socksport in the directory, since it's not
9369 actually meant to be public. For compatibility, publish a 0 there
9371 - Since we ship our own Privoxy on OS X, tweak it so it doesn't write
9372 cookies to disk and doesn't log each web request to disk. (Thanks
9373 to Brett Carrington for pointing this out.)
9374 - Add OSX uninstall instructions. An actual uninstall script will
9376 - Add "opt hibernating 1" to server descriptor to make it clearer
9377 whether the server is hibernating.
9380 Changes in version 0.0.9.10 - 2005-06-16
9381 o Bugfixes on 0.0.9.x (backported from 0.1.0.10):
9382 - Refuse relay cells that claim to have a length larger than the
9383 maximum allowed. This prevents a potential attack that could read
9384 arbitrary memory (e.g. keys) from an exit server's process
9388 Changes in version 0.0.9.9 - 2005-04-23
9389 o Bugfixes on 0.0.9.x:
9390 - If unofficial Tor clients connect and send weird TLS certs, our
9391 Tor server triggers an assert. This release contains a minimal
9392 backport from the broader fix that we put into 0.1.0.4-rc.
9395 Changes in version 0.0.9.8 - 2005-04-07
9396 o Bugfixes on 0.0.9.x:
9397 - We have a bug that I haven't found yet. Sometimes, very rarely,
9398 cpuworkers get stuck in the 'busy' state, even though the cpuworker
9399 thinks of itself as idle. This meant that no new circuits ever got
9400 established. Here's a workaround to kill any cpuworker that's been
9401 busy for more than 100 seconds.
9404 Changes in version 0.0.9.7 - 2005-04-01
9405 o Bugfixes on 0.0.9.x:
9406 - Fix another race crash bug (thanks to Glenn Fink for reporting).
9407 - Compare identity to identity, not to nickname, when extending to
9408 a router not already in the directory. This was preventing us from
9409 extending to unknown routers. Oops.
9410 - Make sure to create OS X Tor user in <500 range, so we aren't
9411 creating actual system users.
9412 - Note where connection-that-hasn't-sent-end was marked, and fix
9413 a few really loud instances of this harmless bug (it's fixed more
9417 Changes in version 0.0.9.6 - 2005-03-24
9418 o Bugfixes on 0.0.9.x (crashes and asserts):
9419 - Add new end stream reasons to maintainance branch. Fix bug where
9420 reason (8) could trigger an assert. Prevent bug from recurring.
9421 - Apparently win32 stat wants paths to not end with a slash.
9422 - Fix assert triggers in assert_cpath_layer_ok(), where we were
9423 blowing away the circuit that conn->cpath_layer points to, then
9424 checking to see if the circ is well-formed. Backport check to make
9425 sure we dont use the cpath on a closed connection.
9426 - Prevent circuit_resume_edge_reading_helper() from trying to package
9427 inbufs for marked-for-close streams.
9428 - Don't crash on hup if your options->address has become unresolvable.
9429 - Some systems (like OS X) sometimes accept() a connection and tell
9430 you the remote host is 0.0.0.0:0. If this happens, due to some
9431 other mis-features, we get confused; so refuse the conn for now.
9433 o Bugfixes on 0.0.9.x (other):
9434 - Fix harmless but scary "Unrecognized content encoding" warn message.
9435 - Add new stream error reason: TORPROTOCOL reason means "you are not
9436 speaking a version of Tor I understand; say bye-bye to your stream."
9437 - Be willing to cache directories from up to ROUTER_MAX_AGE seconds
9438 into the future, now that we are more tolerant of skew. This
9439 resolves a bug where a Tor server would refuse to cache a directory
9440 because all the directories it gets are too far in the future;
9441 yet the Tor server never logs any complaints about clock skew.
9442 - Mac packaging magic: make man pages useable, and do not overwrite
9443 existing torrc files.
9444 - Make OS X log happily to /var/log/tor/tor.log
9447 Changes in version 0.0.9.5 - 2005-02-22
9448 o Bugfixes on 0.0.9.x:
9449 - Fix an assert race at exit nodes when resolve requests fail.
9450 - Stop picking unverified dir mirrors--it only leads to misery.
9451 - Patch from Matt Edman to make NT services work better. Service
9452 support is still not compiled into the executable by default.
9453 - Patch from Dmitri Bely so the Tor service runs better under
9454 the win32 SYSTEM account.
9455 - Make tor-resolve actually work (?) on Win32.
9456 - Fix a sign bug when getrlimit claims to have 4+ billion
9457 file descriptors available.
9458 - Stop refusing to start when bandwidthburst == bandwidthrate.
9459 - When create cells have been on the onion queue more than five
9460 seconds, just send back a destroy and take them off the list.
9463 Changes in version 0.0.9.4 - 2005-02-03
9464 o Bugfixes on 0.0.9:
9465 - Fix an assert bug that took down most of our servers: when
9466 a server claims to have 1 GB of bandwidthburst, don't
9468 - Don't crash as badly if we have spawned the max allowed number
9469 of dnsworkers, or we're out of file descriptors.
9470 - Block more file-sharing ports in the default exit policy.
9471 - MaxConn is now automatically set to the hard limit of max
9472 file descriptors we're allowed (ulimit -n), minus a few for
9474 - Give a clearer message when servers need to raise their
9475 ulimit -n when they start running out of file descriptors.
9476 - SGI Compatibility patches from Jan Schaumann.
9477 - Tolerate a corrupt cached directory better.
9478 - When a dirserver hasn't approved your server, list which one.
9479 - Go into soft hibernation after 95% of the bandwidth is used,
9480 not 99%. This is especially important for daily hibernators who
9481 have a small accounting max. Hopefully it will result in fewer
9482 cut connections when the hard hibernation starts.
9483 - Load-balance better when using servers that claim more than
9484 800kB/s of capacity.
9485 - Make NT services work (experimental, only used if compiled in).
9488 Changes in version 0.0.9.3 - 2005-01-21
9489 o Bugfixes on 0.0.9:
9490 - Backport the cpu use fixes from main branch, so busy servers won't
9491 need as much processor time.
9492 - Work better when we go offline and then come back, or when we
9493 run Tor at boot before the network is up. We do this by
9494 optimistically trying to fetch a new directory whenever an
9495 application request comes in and we think we're offline -- the
9496 human is hopefully a good measure of when the network is back.
9497 - Backport some minimal hidserv bugfixes: keep rend circuits open as
9498 long as you keep using them; actually publish hidserv descriptors
9499 shortly after they change, rather than waiting 20-40 minutes.
9500 - Enable Mac startup script by default.
9501 - Fix duplicate dns_cancel_pending_resolve reported by Giorgos Pallas.
9502 - When you update AllowUnverifiedNodes or FirewallPorts via the
9503 controller's setconf feature, we were always appending, never
9505 - When you update HiddenServiceDir via setconf, it was screwing up
9506 the order of reading the lines, making it fail.
9507 - Do not rewrite a cached directory back to the cache; otherwise we
9508 will think it is recent and not fetch a newer one on startup.
9509 - Workaround for webservers that lie about Content-Encoding: Tor
9510 now tries to autodetect compressed directories and compression
9511 itself. This lets us Proxypass dir fetches through apache.
9514 Changes in version 0.0.9.2 - 2005-01-04
9515 o Bugfixes on 0.0.9 (crashes and asserts):
9516 - Fix an assert on startup when the disk is full and you're logging
9518 - If you do socks4 with an IP of 0.0.0.x but *don't* provide a socks4a
9519 style address, then we'd crash.
9520 - Fix an assert trigger when the running-routers string we get from
9521 a dirserver is broken.
9522 - Make worker threads start and run on win32. Now win32 servers
9524 - Bandaid (not actually fix, but now it doesn't crash) an assert
9525 where the dns worker dies mysteriously and the main Tor process
9526 doesn't remember anything about the address it was resolving.
9528 o Bugfixes on 0.0.9 (Win32):
9529 - Workaround for brain-damaged __FILE__ handling on MSVC: keep Nick's
9530 name out of the warning/assert messages.
9531 - Fix a superficial "unhandled error on read" bug on win32.
9532 - The win32 installer no longer requires a click-through for our
9533 license, since our Free Software license grants rights but does not
9535 - Win32: When connecting to a dirserver fails, try another one
9536 immediately. (This was already working for non-win32 Tors.)
9537 - Stop trying to parse $HOME on win32 when hunting for default
9539 - Make tor-resolve.c work on win32 by calling network_init().
9541 o Bugfixes on 0.0.9 (other):
9542 - Make 0.0.9.x build on Solaris again.
9543 - Due to a fencepost error, we were blowing away the \n when reporting
9544 confvalue items in the controller. So asking for multiple config
9545 values at once couldn't work.
9546 - When listing circuits that are pending on an opening OR connection,
9547 if we're an OR we were listing circuits that *end* at us as
9548 being pending on every listener, dns/cpu worker, etc. Stop that.
9549 - Dirservers were failing to create 'running-routers' or 'directory'
9550 strings if we had more than some threshold of routers. Fix them so
9551 they can handle any number of routers.
9552 - Fix a superficial "Duplicate mark for close" bug.
9553 - Stop checking for clock skew for OR connections, even for servers.
9554 - Fix a fencepost error that was chopping off the last letter of any
9555 nickname that is the maximum allowed nickname length.
9556 - Update URLs in log messages so they point to the new website.
9557 - Fix a potential problem in mangling server private keys while
9558 writing to disk (not triggered yet, as far as we know).
9559 - Include the licenses for other free software we include in Tor,
9560 now that we're shipping binary distributions more regularly.
9563 Changes in version 0.0.9.1 - 2004-12-15
9564 o Bugfixes on 0.0.9:
9565 - Make hibernation actually work.
9566 - Make HashedControlPassword config option work.
9567 - When we're reporting event circuit status to a controller,
9568 don't use the stream status code.
9571 Changes in version 0.0.9 - 2004-12-12
9572 o Bugfixes on 0.0.8.1 (Crashes and asserts):
9573 - Catch and ignore SIGXFSZ signals when log files exceed 2GB; our
9574 write() call will fail and we handle it there.
9575 - When we run out of disk space, or other log writing error, don't
9576 crash. Just stop logging to that log and continue.
9577 - Fix isspace() and friends so they still make Solaris happy
9578 but also so they don't trigger asserts on win32.
9579 - Fix assert failure on malformed socks4a requests.
9580 - Fix an assert bug where a hidden service provider would fail if
9581 the first hop of his rendezvous circuit was down.
9582 - Better handling of size_t vs int, so we're more robust on 64
9585 o Bugfixes on 0.0.8.1 (Win32):
9586 - Make windows sockets actually non-blocking (oops), and handle
9587 win32 socket errors better.
9588 - Fix parse_iso_time on platforms without strptime (eg win32).
9589 - win32: when being multithreaded, leave parent fdarray open.
9590 - Better handling of winsock includes on non-MSV win32 compilers.
9591 - Change our file IO stuff (especially wrt OpenSSL) so win32 is
9593 - Make unit tests work on win32.
9595 o Bugfixes on 0.0.8.1 (Path selection and streams):
9596 - Calculate timeout for waiting for a connected cell from the time
9597 we sent the begin cell, not from the time the stream started. If
9598 it took a long time to establish the circuit, we would time out
9599 right after sending the begin cell.
9600 - Fix router_compare_addr_to_addr_policy: it was not treating a port
9601 of * as always matching, so we were picking reject *:* nodes as
9602 exit nodes too. Oops.
9603 - When read() failed on a stream, we would close it without sending
9604 back an end. So 'connection refused' would simply be ignored and
9605 the user would get no response.
9606 - Stop a sigpipe: when an 'end' cell races with eof from the app,
9607 we shouldn't hold-open-until-flush if the eof arrived first.
9608 - Let resolve conns retry/expire also, rather than sticking around
9610 - Fix more dns related bugs: send back resolve_failed and end cells
9611 more reliably when the resolve fails, rather than closing the
9612 circuit and then trying to send the cell. Also attach dummy resolve
9613 connections to a circuit *before* calling dns_resolve(), to fix
9614 a bug where cached answers would never be sent in RESOLVED cells.
9616 o Bugfixes on 0.0.8.1 (Circuits):
9617 - Finally fix a bug that's been plaguing us for a year:
9618 With high load, circuit package window was reaching 0. Whenever
9619 we got a circuit-level sendme, we were reading a lot on each
9620 socket, but only writing out a bit. So we would eventually reach
9621 eof. This would be noticed and acted on even when there were still
9622 bytes sitting in the inbuf.
9623 - Use identity comparison, not nickname comparison, to choose which
9624 half of circuit-ID-space each side gets to use. This is needed
9625 because sometimes we think of a router as a nickname, and sometimes
9626 as a hex ID, and we can't predict what the other side will do.
9628 o Bugfixes on 0.0.8.1 (Other):
9629 - Fix a whole slew of memory leaks.
9630 - Disallow NDEBUG. We don't ever want anybody to turn off debug.
9631 - If we are using select, make sure we stay within FD_SETSIZE.
9632 - When poll() is interrupted, we shouldn't believe the revents values.
9633 - Add a FAST_SMARTLIST define to optionally inline smartlist_get
9634 and smartlist_len, which are two major profiling offenders.
9635 - If do_hup fails, actually notice.
9636 - Flush the log file descriptor after we print "Tor opening log file",
9637 so we don't see those messages days later.
9638 - Hidden service operators now correctly handle version 1 style
9639 INTRODUCE1 cells (nobody generates them still, so not a critical
9641 - Handle more errnos from accept() without closing the listener.
9642 Some OpenBSD machines were closing their listeners because
9643 they ran out of file descriptors.
9644 - Some people had wrapped their tor client/server in a script
9645 that would restart it whenever it died. This did not play well
9646 with our "shut down if your version is obsolete" code. Now people
9647 don't fetch a new directory if their local cached version is
9649 - Make our autogen.sh work on ksh as well as bash.
9650 - Better torrc example lines for dirbindaddress and orbindaddress.
9651 - Improved bounds checking on parsed ints (e.g. config options and
9652 the ones we find in directories.)
9653 - Stop using separate defaults for no-config-file and
9654 empty-config-file. Now you have to explicitly turn off SocksPort,
9655 if you don't want it open.
9656 - We were starting to daemonize before we opened our logs, so if
9657 there were any problems opening logs, we would complain to stderr,
9658 which wouldn't work, and then mysteriously exit.
9659 - If a verified OR connects to us before he's uploaded his descriptor,
9660 or we verify him and hup but he still has the original TLS
9661 connection, then conn->nickname is still set like he's unverified.
9663 o Code security improvements, inspired by Ilja:
9664 - tor_snprintf wrapper over snprintf with consistent (though not C99)
9666 - Replace sprintf with tor_snprintf. (I think they were all safe, but
9668 - Replace strcpy/strncpy with strlcpy in more places.
9669 - Avoid strcat; use tor_snprintf or strlcat instead.
9671 o Features (circuits and streams):
9672 - New circuit building strategy: keep a list of ports that we've
9673 used in the past 6 hours, and always try to have 2 circuits open
9674 or on the way that will handle each such port. Seed us with port
9675 80 so web users won't complain that Tor is "slow to start up".
9676 - Make kill -USR1 dump more useful stats about circuits.
9677 - When warning about retrying or giving up, print the address, so
9678 the user knows which one it's talking about.
9679 - If you haven't used a clean circuit in an hour, throw it away,
9680 just to be on the safe side. (This means after 6 hours a totally
9681 unused Tor client will have no circuits open.)
9682 - Support "foo.nickname.exit" addresses, to let Alice request the
9683 address "foo" as viewed by exit node "nickname". Based on a patch
9685 - If your requested entry or exit node has advertised bandwidth 0,
9687 - Be more greedy about filling up relay cells -- we try reading again
9688 once we've processed the stuff we read, in case enough has arrived
9689 to fill the last cell completely.
9690 - Refuse application socks connections to port 0.
9691 - Use only 0.0.9pre1 and later servers for resolve cells.
9693 o Features (bandwidth):
9694 - Hibernation: New config option "AccountingMax" lets you
9695 set how many bytes per month (in each direction) you want to
9696 allow your server to consume. Rather than spreading those
9697 bytes out evenly over the month, we instead hibernate for some
9698 of the month and pop up at a deterministic time, work until
9699 the bytes are consumed, then hibernate again. Config option
9700 "MonthlyAccountingStart" lets you specify which day of the month
9701 your billing cycle starts on.
9702 - Implement weekly/monthly/daily accounting: now you specify your
9703 hibernation properties by
9704 AccountingMax N bytes|KB|MB|GB|TB
9705 AccountingStart day|week|month [day] HH:MM
9706 Defaults to "month 1 0:00".
9707 - Let bandwidth and interval config options be specified as 5 bytes,
9708 kb, kilobytes, etc; and as seconds, minutes, hours, days, weeks.
9710 o Features (directories):
9711 - New "router-status" line in directory, to better bind each verified
9712 nickname to its identity key.
9713 - Clients can ask dirservers for /dir.z to get a compressed version
9714 of the directory. Only works for servers running 0.0.9, of course.
9715 - Make clients cache directories and use them to seed their router
9716 lists at startup. This means clients have a datadir again.
9717 - Respond to content-encoding headers by trying to uncompress as
9719 - Clients and servers now fetch running-routers; cache
9720 running-routers; compress running-routers; serve compressed
9722 - Make moria2 advertise a dirport of 80, so people behind firewalls
9723 will be able to get a directory.
9724 - Http proxy support
9725 - Dirservers translate requests for http://%s:%d/x to /x
9726 - You can specify "HttpProxy %s[:%d]" and all dir fetches will
9727 be routed through this host.
9728 - Clients ask for /tor/x rather than /x for new enough dirservers.
9729 This way we can one day coexist peacefully with apache.
9730 - Clients specify a "Host: %s%d" http header, to be compatible
9731 with more proxies, and so running squid on an exit node can work.
9732 - Protect dirservers from overzealous descriptor uploading -- wait
9733 10 seconds after directory gets dirty, before regenerating.
9735 o Features (packages and install):
9736 - Add NSI installer contributed by J Doe.
9737 - Apply NT service patch from Osamu Fujino. Still needs more work.
9738 - Commit VC6 and VC7 workspace/project files.
9739 - Commit a tor.spec for making RPM files, with help from jbash.
9740 - Add contrib/torctl.in contributed by Glenn Fink.
9741 - Make expand_filename handle ~ and ~username.
9742 - Use autoconf to enable largefile support where necessary. Use
9743 ftello where available, since ftell can fail at 2GB.
9744 - Ship src/win32/ in the tarball, so people can use it to build.
9745 - Make old win32 fall back to CWD if SHGetSpecialFolderLocation
9748 o Features (ui controller):
9749 - Control interface: a separate program can now talk to your
9750 client/server over a socket, and get/set config options, receive
9751 notifications of circuits and streams starting/finishing/dying,
9752 bandwidth used, etc. The next step is to get some GUIs working.
9753 Let us know if you want to help out. See doc/control-spec.txt .
9754 - Ship a contrib/tor-control.py as an example script to interact
9755 with the control port.
9756 - "tor --hash-password zzyxz" will output a salted password for
9757 use in authenticating to the control interface.
9758 - Implement the control-spec's SAVECONF command, to write your
9759 configuration to torrc.
9760 - Get cookie authentication for the controller closer to working.
9761 - When set_conf changes our server descriptor, upload a new copy.
9762 But don't upload it too often if there are frequent changes.
9764 o Features (config and command-line):
9765 - Deprecate unofficial config option abbreviations, and abbreviations
9766 not on the command line.
9767 - Configuration infrastructure support for warning on obsolete
9769 - Give a slightly more useful output for "tor -h".
9770 - Break DirFetchPostPeriod into:
9771 - DirFetchPeriod for fetching full directory,
9772 - StatusFetchPeriod for fetching running-routers,
9773 - DirPostPeriod for posting server descriptor,
9774 - RendPostPeriod for posting hidden service descriptors.
9775 - New log format in config:
9776 "Log minsev[-maxsev] stdout|stderr|syslog" or
9777 "Log minsev[-maxsev] file /var/foo"
9778 - DirPolicy config option, to let people reject incoming addresses
9779 from their dirserver.
9780 - "tor --list-fingerprint" will list your identity key fingerprint
9782 - Make tor --version --version dump the cvs Id of every file.
9783 - New 'MyFamily nick1,...' config option for a server to
9784 specify other servers that shouldn't be used in the same circuit
9785 with it. Only believed if nick1 also specifies us.
9786 - New 'NodeFamily nick1,nick2,...' config option for a client to
9787 specify nodes that it doesn't want to use in the same circuit.
9788 - New 'Redirectexit pattern address:port' config option for a
9789 server to redirect exit connections, e.g. to a local squid.
9790 - Add "pass" target for RedirectExit, to make it easier to break
9791 out of a sequence of RedirectExit rules.
9792 - Make the dirservers file obsolete.
9793 - Include a dir-signing-key token in directories to tell the
9794 parsing entity which key is being used to sign.
9795 - Remove the built-in bulky default dirservers string.
9796 - New config option "Dirserver %s:%d [fingerprint]", which can be
9797 repeated as many times as needed. If no dirservers specified,
9798 default to moria1,moria2,tor26.
9799 - Make 'Routerfile' config option obsolete.
9800 - Discourage people from setting their dirfetchpostperiod more often
9801 than once per minute.
9804 - kill -USR2 now moves all logs to loglevel debug (kill -HUP to
9805 get back to normal.)
9806 - Accept *:706 (silc) in default exit policy.
9807 - Implement new versioning format for post 0.1.
9808 - Distinguish between TOR_TLS_CLOSE and TOR_TLS_ERROR, so we can
9809 log more informatively.
9810 - Check clock skew for verified servers, but allow unverified
9811 servers and clients to have any clock skew.
9812 - Make sure the hidden service descriptors are at a random offset
9813 from each other, to hinder linkability.
9814 - Clients now generate a TLS cert too, in preparation for having
9815 them act more like real nodes.
9816 - Add a pure-C tor-resolve implementation.
9817 - Use getrlimit and friends to ensure we can reach MaxConn (currently
9818 1024) file descriptors.
9819 - Raise the max dns workers from 50 to 100.
9822 Changes in version 0.0.8.1 - 2004-10-13
9824 - Fix a seg fault that can be triggered remotely for Tor
9825 clients/servers with an open dirport.
9826 - Fix a rare assert trigger, where routerinfos for entries in
9827 our cpath would expire while we're building the path.
9828 - Fix a bug in OutboundBindAddress so it (hopefully) works.
9829 - Fix a rare seg fault for people running hidden services on
9830 intermittent connections.
9831 - Fix a bug in parsing opt keywords with objects.
9832 - Fix a stale pointer assert bug when a stream detaches and
9834 - Fix a string format vulnerability (probably not exploitable)
9835 in reporting stats locally.
9836 - Fix an assert trigger: sometimes launching circuits can fail
9837 immediately, e.g. because too many circuits have failed recently.
9838 - Fix a compile warning on 64 bit platforms.
9841 Changes in version 0.0.8 - 2004-08-25
9843 - Made our unit tests compile again on OpenBSD 3.5, and tor
9844 itself compile again on OpenBSD on a sparc64.
9845 - We were neglecting milliseconds when logging on win32, so
9846 everything appeared to happen at the beginning of each second.
9847 - Check directory signature _before_ you decide whether you're
9848 you're running an obsolete version and should exit.
9849 - Check directory signature _before_ you parse the running-routers
9850 list to decide who's running.
9851 - Check return value of fclose while writing to disk, so we don't
9852 end up with broken files when servers run out of disk space.
9853 - Port it to SunOS 5.9 / Athena
9854 - Fix two bugs in saving onion keys to disk when rotating, so
9855 hopefully we'll get fewer people using old onion keys.
9856 - Remove our mostly unused -- and broken -- hex_encode()
9857 function. Use base16_encode() instead. (Thanks to Timo Lindfors
9858 for pointing out this bug.)
9859 - Only pick and establish intro points after we've gotten a
9861 - Fix assert triggers: if the other side returns an address 0.0.0.0,
9862 don't put it into the client dns cache.
9863 - If a begin failed due to exit policy, but we believe the IP
9864 address should have been allowed, switch that router to exitpolicy
9865 reject *:* until we get our next directory.
9868 - 'Extend' relay cell payloads now include the digest of the
9869 intended next hop's identity key. Now we can verify that we're
9870 extending to the right router, and also extend to routers we
9871 hadn't heard of before.
9874 - Tor nodes can now act as relays (with an advertised ORPort)
9875 without being manually verified by the dirserver operators.
9876 - Uploaded descriptors of unverified routers are now accepted
9877 by the dirservers, and included in the directory.
9878 - Verified routers are listed by nickname in the running-routers
9879 list; unverified routers are listed as "$<fingerprint>".
9880 - We now use hash-of-identity-key in most places rather than
9881 nickname or addr:port, for improved security/flexibility.
9882 - AllowUnverifiedNodes config option to let circuits choose no-name
9883 routers in entry,middle,exit,introduction,rendezvous positions.
9884 Allow middle and rendezvous positions by default.
9885 - When picking unverified routers, skip those with low uptime and/or
9886 low bandwidth, depending on what properties you care about.
9887 - ClientOnly option for nodes that never want to become servers.
9888 - Directory caching.
9889 - "AuthoritativeDir 1" option for the official dirservers.
9890 - Now other nodes (clients and servers) will cache the latest
9891 directory they've pulled down.
9892 - They can enable their DirPort to serve it to others.
9893 - Clients will pull down a directory from any node with an open
9894 DirPort, and check the signature/timestamp correctly.
9895 - Authoritative dirservers now fetch directories from other
9896 authdirservers, to stay better synced.
9897 - Running-routers list tells who's down also, along with noting
9898 if they're verified (listed by nickname) or unverified (listed
9900 - Allow dirservers to serve running-router list separately.
9901 This isn't used yet.
9902 - You can now fetch $DIRURL/running-routers to get just the
9903 running-routers line, not the whole descriptor list. (But
9904 clients don't use this yet.)
9905 - Clients choose nodes proportional to advertised bandwidth.
9906 - Clients avoid using nodes with low uptime as introduction points.
9907 - Handle servers with dynamic IP addresses: don't just replace
9908 options->Address with the resolved one at startup, and
9909 detect our address right before we make a routerinfo each time.
9910 - 'FascistFirewall' option to pick dirservers and ORs on specific
9911 ports; plus 'FirewallPorts' config option to tell FascistFirewall
9912 which ports are open. (Defaults to 80,443)
9913 - Try other dirservers immediately if the one you try is down. This
9914 should tolerate down dirservers better now.
9915 - ORs connect-on-demand to other ORs
9916 - If you get an extend cell to an OR you're not connected to,
9917 connect, handshake, and forward the create cell.
9918 - The authoritative dirservers stay connected to everybody,
9919 and everybody stays connected to 0.0.7 servers, but otherwise
9920 clients/servers expire unused connections after 5 minutes.
9921 - When servers get a sigint, they delay 30 seconds (refusing new
9922 connections) then exit. A second sigint causes immediate exit.
9923 - File and name management:
9924 - Look for .torrc if no CONFDIR "torrc" is found.
9925 - If no datadir is defined, then choose, make, and secure ~/.tor
9927 - If torrc not found, exitpolicy reject *:*.
9928 - Expands ~/ in filenames to $HOME/ (but doesn't yet expand ~arma).
9929 - If no nickname is defined, derive default from hostname.
9930 - Rename secret key files, e.g. identity.key -> secret_id_key,
9931 to discourage people from mailing their identity key to tor-ops.
9932 - Refuse to build a circuit before the directory has arrived --
9933 it won't work anyway, since you won't know the right onion keys
9935 - Parse tor version numbers so we can do an is-newer-than check
9936 rather than an is-in-the-list check.
9937 - New socks command 'resolve', to let us shim gethostbyname()
9939 - A 'tor_resolve' script to access the socks resolve functionality.
9940 - A new socks-extensions.txt doc file to describe our
9941 interpretation and extensions to the socks protocols.
9942 - Add a ContactInfo option, which gets published in descriptor.
9943 - Write tor version at the top of each log file
9944 - New docs in the tarball:
9946 - Document that you should proxy your SSL traffic too.
9947 - Log a warning if the user uses an unsafe socks variant, so people
9948 are more likely to learn about privoxy or socat.
9949 - Log a warning if you're running an unverified server, to let you
9950 know you might want to get it verified.
9951 - Change the default exit policy to reject the default edonkey,
9952 kazaa, gnutella ports.
9953 - Add replace_file() to util.[ch] to handle win32's rename().
9954 - Publish OR uptime in descriptor (and thus in directory) too.
9955 - Remember used bandwidth (both in and out), and publish 15-minute
9956 snapshots for the past day into our descriptor.
9957 - Be more aggressive about trying to make circuits when the network
9958 has changed (e.g. when you unsuspend your laptop).
9959 - Check for time skew on http headers; report date in response to
9961 - If the entrynode config line has only one node, don't pick it as
9963 - Add strict{entry|exit}nodes config options. If set to 1, then
9964 we refuse to build circuits that don't include the specified entry
9966 - OutboundBindAddress config option, to bind to a specific
9967 IP address for outgoing connect()s.
9968 - End truncated log entries (e.g. directories) with "[truncated]".
9971 Changes in version 0.0.7.3 - 2004-08-12
9972 o Stop dnsworkers from triggering an assert failure when you
9973 ask them to resolve the host "".
9976 Changes in version 0.0.7.2 - 2004-07-07
9977 o A better fix for the 0.0.0.0 problem, that will hopefully
9978 eliminate the remaining related assertion failures.
9981 Changes in version 0.0.7.1 - 2004-07-04
9982 o When an address resolves to 0.0.0.0, treat it as a failed resolve,
9983 since internally we use 0.0.0.0 to signify "not yet resolved".
9986 Changes in version 0.0.7 - 2004-06-07
9987 o Fixes for crashes and other obnoxious bugs:
9988 - Fix an epipe bug: sometimes when directory connections failed
9989 to connect, we would give them a chance to flush before closing
9991 - When we detached from a circuit because of resolvefailed, we
9992 would immediately try the same circuit twice more, and then
9993 give up on the resolve thinking we'd tried three different
9995 - Limit the number of intro circuits we'll attempt to build for a
9996 hidden service per 15-minute period.
9997 - Check recommended-software string *early*, before actually parsing
9998 the directory. Thus we can detect an obsolete version and exit,
9999 even if the new directory format doesn't parse.
10000 o Fixes for security bugs:
10001 - Remember which nodes are dirservers when you startup, and if a
10002 random OR enables his dirport, don't automatically assume he's
10003 a trusted dirserver.
10005 - Directory connections were asking the wrong poll socket to
10006 start writing, and not asking themselves to start writing.
10007 - When we detached from a circuit because we sent a begin but
10008 didn't get a connected, we would use it again the first time;
10009 but after that we would correctly switch to a different one.
10010 - Stop warning when the first onion decrypt attempt fails; they
10011 will sometimes legitimately fail now that we rotate keys.
10012 - Override unaligned-access-ok check when $host_cpu is ia64 or
10013 arm. Apparently they allow it but the kernel whines.
10014 - Dirservers try to reconnect periodically too, in case connections
10016 - Fix some memory leaks in directory servers.
10017 - Allow backslash in Win32 filenames.
10018 - Made Tor build complain-free on FreeBSD, hopefully without
10019 breaking other BSD builds. We'll see.
10020 - Check directory signatures based on name of signer, not on whom
10021 we got the directory from. This will let us cache directories more
10023 - Rotate dnsworkers and cpuworkers on SIGHUP, so they get new config
10026 - Doxygen markup on all functions and global variables.
10027 - Make directory functions update routerlist, not replace it. So
10028 now directory disagreements are not so critical a problem.
10029 - Remove the upper limit on number of descriptors in a dirserver's
10030 directory (not that we were anywhere close).
10031 - Allow multiple logfiles at different severity ranges.
10032 - Allow *BindAddress to specify ":port" rather than setting *Port
10033 separately. Allow multiple instances of each BindAddress config
10034 option, so you can bind to multiple interfaces if you want.
10035 - Allow multiple exit policy lines, which are processed in order.
10036 Now we don't need that huge line with all the commas in it.
10037 - Enable accept/reject policies on SOCKS connections, so you can bind
10038 to 0.0.0.0 but still control who can use your OP.
10039 - Updated the man page to reflect these features.
10042 Changes in version 0.0.6.2 - 2004-05-16
10043 o Our integrity-checking digest was checking only the most recent cell,
10044 not the previous cells like we'd thought.
10045 Thanks to Stefan Mark for finding the flaw!
10048 Changes in version 0.0.6.1 - 2004-05-06
10049 o Fix two bugs in our AES counter-mode implementation (this affected
10050 onion-level stream encryption, but not TLS-level). It turns
10051 out we were doing something much more akin to a 16-character
10052 polyalphabetic cipher. Oops.
10053 Thanks to Stefan Mark for finding the flaw!
10054 o Retire moria3 as a directory server, and add tor26 as a directory
10058 Changes in version 0.0.6 - 2004-05-02
10060 - Hidden services and rendezvous points are implemented. Go to
10061 http://6sxoyfb3h2nvok2d.onion/ for an index of currently available
10062 hidden services. (This only works via a socks4a proxy such as
10063 Privoxy, and currently it's quite slow.)
10064 - We now rotate link (tls context) keys and onion keys.
10065 - CREATE cells now include oaep padding, so you can tell
10066 if you decrypted them correctly.
10067 - Retry stream correctly when we fail to connect because of
10068 exit-policy-reject (should try another) or can't-resolve-address.
10069 - When we hup a dirserver and we've *removed* a server from the
10070 approved-routers list, now we remove that server from the
10071 in-memory directories too.
10072 - Add bandwidthburst to server descriptor.
10073 - Directories now say which dirserver signed them.
10074 - Use a tor_assert macro that logs failed assertions too.
10075 - Since we don't support truncateds much, don't bother sending them;
10076 just close the circ.
10077 - Fetch randomness from /dev/urandom better (not via fopen/fread)
10078 - Better debugging for tls errors
10079 - Set Content-Type on the directory and hidserv descriptor.
10080 - Remove IVs from cipher code, since AES-ctr has none.
10082 - Fix an assert trigger for exit nodes that's been plaguing us since
10083 the days of 0.0.2prexx (thanks weasel!)
10084 - Fix a bug where we were closing tls connections intermittently.
10085 It turns out openssl keeps its errors around -- so if an error
10086 happens, and you don't ask about it, and then another openssl
10087 operation happens and succeeds, and you ask if there was an error,
10088 it tells you about the first error.
10089 - Fix a bug that's been lurking since 27 may 03 (!)
10090 When passing back a destroy cell, we would use the wrong circ id.
10091 - Don't crash if a conn that sent a begin has suddenly lost its circuit.
10092 - Some versions of openssl have an SSL_pending function that erroneously
10093 returns bytes when there is a non-application record pending.
10094 - Win32 fixes. Tor now compiles on win32 with no warnings/errors.
10095 o We were using an array of length zero in a few places.
10096 o Win32's gethostbyname can't resolve an IP to an IP.
10097 o Win32's close can't close a socket.
10098 o Handle windows socket errors correctly.
10100 - check for <sys/limits.h> so we build on FreeBSD again, and
10101 <machine/limits.h> for NetBSD.
10104 Changes in version 0.0.5 - 2004-03-30
10105 o Install torrc as torrc.sample -- we no longer clobber your
10107 o Fix mangled-state bug in directory fetching (was causing sigpipes).
10108 o Only build circuits after we've fetched the directory: clients were
10109 using only the directory servers before they'd fetched a directory.
10110 This also means longer startup time; so it goes.
10111 o Fix an assert trigger where an OP would fail to handshake, and we'd
10112 expect it to have a nickname.
10113 o Work around a tsocks bug: do a socks reject when AP connection dies
10114 early, else tsocks goes into an infinite loop.
10115 o Hold socks connection open until reply is flushed (if possible)
10116 o Make exit nodes resolve IPs to IPs immediately, rather than asking
10117 the dns farm to do it.
10118 o Fix c99 aliasing warnings in rephist.c
10119 o Don't include server descriptors that are older than 24 hours in the
10121 o Give socks 'reject' replies their whole 15s to attempt to flush,
10122 rather than seeing the 60s timeout and assuming the flush had failed.
10123 o Clean automake droppings from the cvs repository
10124 o Add in a 'notice' log level for things the operator should hear
10125 but that aren't warnings
10128 Changes in version 0.0.4 - 2004-03-26
10129 o When connecting to a dirserver or OR and the network is down,
10133 Changes in version 0.0.3 - 2004-03-26
10134 o Warn and fail if server chose a nickname with illegal characters
10135 o Port to Solaris and Sparc:
10136 - include missing header fcntl.h
10137 - have autoconf find -lsocket -lnsl automatically
10138 - deal with hardware word alignment
10139 - make uname() work (solaris has a different return convention)
10140 - switch from using signal() to sigaction()
10141 o Preliminary work on reputation system:
10142 - Keep statistics on success/fail of connect attempts; they're published
10143 by kill -USR1 currently.
10144 - Add a RunTesting option to try to learn link state by creating test
10145 circuits, even when SocksPort is off.
10146 - Remove unused open circuits when there are too many.
10149 Changes in version 0.0.2 - 2004-03-19
10150 - Include strlcpy and strlcat for safer string ops
10151 - define INADDR_NONE so we compile (but still not run) on solaris
10154 Changes in version 0.0.2pre27 - 2004-03-14
10156 - Allow internal tor networks (we were rejecting internal IPs,
10157 now we allow them if they're set explicitly).
10158 - And fix a few endian issues.
10161 Changes in version 0.0.2pre26 - 2004-03-14
10163 - If a stream times out after 15s without a connected cell, don't
10164 try that circuit again: try a new one.
10165 - Retry streams at most 4 times. Then give up.
10166 - When a dirserver gets a descriptor from an unknown router, it
10167 logs its fingerprint (so the dirserver operator can choose to
10168 accept it even without mail from the server operator).
10169 - Inform unapproved servers when we reject their descriptors.
10170 - Make tor build on Windows again. It works as a client, who knows
10172 - Clearer instructions in the torrc for how to set up a server.
10173 - Be more efficient about reading fd's when our global token bucket
10174 (used for rate limiting) becomes empty.
10176 - Stop asserting that computers always go forward in time. It's
10178 - When we sent a cell (e.g. destroy) and then marked an OR connection
10179 expired, we might close it before finishing a flush if the other
10180 side isn't reading right then.
10181 - Don't allow dirservers to start if they haven't defined
10182 RecommendedVersions
10183 - We were caching transient dns failures. Oops.
10184 - Prevent servers from publishing an internal IP as their address.
10185 - Address a strcat vulnerability in circuit.c
10188 Changes in version 0.0.2pre25 - 2004-03-04
10190 - Put the OR's IP in its router descriptor, not its fqdn. That way
10191 we'll stop being stalled by gethostbyname for nodes with flaky dns,
10194 - If the user typed in an address that didn't resolve, the server
10198 Changes in version 0.0.2pre24 - 2004-03-03
10200 - Fix an assertion failure in dns.c, where we were trying to dequeue
10201 a pending dns resolve even if it wasn't pending
10202 - Fix a spurious socks5 warning about still trying to write after the
10203 connection is finished.
10204 - Hold certain marked_for_close connections open until they're finished
10205 flushing, rather than losing bytes by closing them too early.
10206 - Correctly report the reason for ending a stream
10207 - Remove some duplicate calls to connection_mark_for_close
10208 - Put switch_id and start_daemon earlier in the boot sequence, so it
10209 will actually try to chdir() to options.DataDirectory
10210 - Make 'make test' exit(1) if a test fails; fix some unit tests
10211 - Make tor fail when you use a config option it doesn't know about,
10212 rather than warn and continue.
10213 - Make --version work
10214 - Bugfixes on the rpm spec file and tor.sh, so it's more up to date
10217 Changes in version 0.0.2pre23 - 2004-02-29
10219 - Print a statement when the first circ is finished, so the user
10220 knows it's working.
10221 - If a relay cell is unrecognized at the end of the circuit,
10222 send back a destroy. (So attacks to mutate cells are more
10224 - New config option 'excludenodes' to avoid certain nodes for circuits.
10225 - When it daemonizes, it chdir's to the DataDirectory rather than "/",
10226 so you can collect coredumps there.
10228 - Fix a bug in tls flushing where sometimes data got wedged and
10229 didn't flush until more data got sent. Hopefully this bug was
10230 a big factor in the random delays we were seeing.
10231 - Make 'connected' cells include the resolved IP, so the client
10232 dns cache actually gets populated.
10233 - Disallow changing from ORPort=0 to ORPort>0 on hup.
10234 - When we time-out on a stream and detach from the circuit, send an
10235 end cell down it first.
10236 - Only warn about an unknown router (in exitnodes, entrynodes,
10237 excludenodes) after we've fetched a directory.
10240 Changes in version 0.0.2pre22 - 2004-02-26
10242 - Servers publish less revealing uname information in descriptors.
10243 - More memory tracking and assertions, to crash more usefully when
10245 - If the default torrc isn't there, just use some default defaults.
10246 Plus provide an internal dirservers file if they don't have one.
10247 - When the user tries to use Tor as an http proxy, give them an http
10248 501 failure explaining that we're a socks proxy.
10249 - Dump a new router.desc on hup, to help confused people who change
10250 their exit policies and then wonder why router.desc doesn't reflect
10252 - Clean up the generic tor.sh init script that we ship with.
10254 - If the exit stream is pending on the resolve, and a destroy arrives,
10255 then the stream wasn't getting removed from the pending list. I
10256 think this was the one causing recent server crashes.
10257 - Use a more robust poll on OSX 10.3, since their poll is flaky.
10258 - When it couldn't resolve any dirservers, it was useless from then on.
10259 Now it reloads the RouterFile (or default dirservers) if it has no
10261 - Move the 'tor' binary back to /usr/local/bin/ -- it turns out
10262 many users don't even *have* a /usr/local/sbin/.
10265 Changes in version 0.0.2pre21 - 2004-02-18
10267 - There's a ChangeLog file that actually reflects the changelog.
10268 - There's a 'torify' wrapper script, with an accompanying
10269 tor-tsocks.conf, that simplifies the process of using tsocks for
10270 tor. It even has a man page.
10271 - The tor binary gets installed to sbin rather than bin now.
10272 - Retry streams where the connected cell hasn't arrived in 15 seconds
10273 - Clean up exit policy handling -- get the default out of the torrc,
10274 so we can update it without forcing each server operator to fix
10276 - Allow imaps and pop3s in default exit policy
10278 - Prevent picking middleman nodes as the last node in the circuit
10281 Changes in version 0.0.2pre20 - 2004-01-30
10283 - We now have a deb package, and it's in debian unstable. Go to
10284 it, apt-getters. :)
10285 - I've split the TotalBandwidth option into BandwidthRate (how many
10286 bytes per second you want to allow, long-term) and
10287 BandwidthBurst (how many bytes you will allow at once before the cap
10288 kicks in). This better token bucket approach lets you, say, set
10289 BandwidthRate to 10KB/s and BandwidthBurst to 10MB, allowing good
10290 performance while not exceeding your monthly bandwidth quota.
10291 - Push out a tls record's worth of data once you've got it, rather
10292 than waiting until you've read everything waiting to be read. This
10293 may improve performance by pipelining better. We'll see.
10294 - Add an AP_CONN_STATE_CONNECTING state, to allow streams to detach
10295 from failed circuits (if they haven't been connected yet) and attach
10297 - Expire old streams that haven't managed to connect. Some day we'll
10298 have them reattach to new circuits instead.
10301 - Fix several memory leaks that were causing servers to become bloated
10303 - Fix a few very rare assert triggers. A few more remain.
10304 - Setuid to User _before_ complaining about running as root.
10307 Changes in version 0.0.2pre19 - 2004-01-07
10309 - Fix deadlock condition in dns farm. We were telling a child to die by
10310 closing the parent's file descriptor to him. But newer children were
10311 inheriting the open file descriptor from the parent, and since they
10312 weren't closing it, the socket never closed, so the child never read
10313 eof, so he never knew to exit. Similarly, dns workers were holding
10314 open other sockets, leading to all sorts of chaos.
10315 - New cleaner daemon() code for forking and backgrounding.
10316 - If you log to a file, it now prints an entry at the top of the
10317 logfile so you know it's working.
10318 - The onionskin challenge length was 30 bytes longer than necessary.
10319 - Started to patch up the spec so it's not quite so out of date.
10322 Changes in version 0.0.2pre18 - 2004-01-02
10324 - Fix endian issues with the 'integrity' field in the relay header.
10325 - Fix a potential bug where connections in state
10326 AP_CONN_STATE_CIRCUIT_WAIT might unexpectedly ask to write.
10329 Changes in version 0.0.2pre17 - 2003-12-30
10331 - Made --debuglogfile (or any second log file, actually) work.
10332 - Resolved an edge case in get_unique_circ_id_by_conn where a smart
10333 adversary could force us into an infinite loop.
10336 - Each onionskin handshake now includes a hash of the computed key,
10337 to prove the server's identity and help perfect forward secrecy.
10338 - Changed cell size from 256 to 512 bytes (working toward compatibility
10340 - Changed cell length to 2 bytes, and moved it to the relay header.
10341 - Implemented end-to-end integrity checking for the payloads of
10343 - Separated streamid from 'recognized' (otherwise circuits will get
10344 messed up when we try to have streams exit from the middle). We
10345 use the integrity-checking to confirm that a cell is addressed to
10347 - Randomize the initial circid and streamid values, so an adversary who
10348 breaks into a node can't learn how many circuits or streams have
10352 Changes in version 0.0.2pre16 - 2003-12-14
10354 - Fixed a bug that made HUP trigger an assert
10355 - Fixed a bug where a circuit that immediately failed wasn't being
10356 counted as a failed circuit in counting retries.
10359 - Now we close the circuit when we get a truncated cell: otherwise we're
10360 open to an anonymity attack where a bad node in the path truncates
10361 the circuit and then we open streams at him.
10362 - Add port ranges to exit policies
10363 - Add a conservative default exit policy
10364 - Warn if you're running tor as root
10365 - on HUP, retry OR connections and close/rebind listeners
10366 - options.EntryNodes: try these nodes first when picking the first node
10367 - options.ExitNodes: if your best choices happen to include any of
10368 your preferred exit nodes, you choose among just those preferred
10370 - options.ExcludedNodes: nodes that are never picked in path building
10373 Changes in version 0.0.2pre15 - 2003-12-03
10374 o Robustness and bugfixes:
10375 - Sometimes clients would cache incorrect DNS resolves, which would
10376 really screw things up.
10377 - An OP that goes offline would slowly leak all its sockets and stop
10379 - A wide variety of bugfixes in exit node selection, exit policy
10380 handling, and processing pending streams when a new circuit is
10382 - Pick nodes for a path only from those the directory says are up
10383 - Choose randomly from all running dirservers, not always the first one
10384 - Increase allowed http header size for directory fetch.
10385 - Stop writing to stderr (if we're daemonized it will be closed).
10386 - Enable -g always, so cores will be more useful to me.
10387 - Switch "-lcrypto -lssl" to "-lssl -lcrypto" for broken distributions.
10390 - Wrote a man page. It lists commonly used options.
10393 - Change default loglevel to warn.
10394 - Make PidFile default to null rather than littering in your CWD.
10395 - OnionRouter config option is now obsolete. Instead it just checks
10397 - Moved to a single unified torrc file for both clients and servers.
10400 Changes in version 0.0.2pre14 - 2003-11-29
10401 o Robustness and bugfixes:
10402 - Force the admin to make the DataDirectory himself
10403 - to get ownership/permissions right
10404 - so clients no longer make a DataDirectory and then never use it
10405 - fix bug where a client who was offline for 45 minutes would never
10406 pull down a directory again
10407 - fix (or at least hide really well) the dns assert bug that was
10408 causing server crashes
10409 - warnings and improved robustness wrt clockskew for certs
10410 - use the native daemon(3) to daemonize, when available
10411 - exit if bind() fails
10412 - exit if neither socksport nor orport is defined
10413 - include our own tor_timegm (Win32 doesn't have its own)
10414 - bugfix for win32 with lots of connections
10415 - fix minor bias in PRNG
10416 - make dirserver more robust to corrupt cached directory
10419 - Wrote the design document (woo)
10421 o Circuit building and exit policies:
10422 - Circuits no longer try to use nodes that the directory has told them
10424 - Exit policies now support bitmasks (18.0.0.0/255.0.0.0) and
10425 bitcounts (18.0.0.0/8).
10426 - Make AP connections standby for a circuit if no suitable circuit
10427 exists, rather than failing
10428 - Circuits choose exit node based on addr/port, exit policies, and
10429 which AP connections are standing by
10430 - Bump min pathlen from 2 to 3
10431 - Relay end cells have a payload to describe why the stream ended.
10432 - If the stream failed because of exit policy, try again with a new
10434 - Clients have a dns cache to remember resolved addresses.
10435 - Notice more quickly when we have no working circuits
10438 - APPort is now called SocksPort
10439 - SocksBindAddress, ORBindAddress, DirBindAddress let you configure
10441 - RecommendedVersions is now a config variable rather than
10442 hardcoded (for dirservers)
10443 - Reloads config on HUP
10444 - Usage info on -h or --help
10445 - If you set User and Group config vars, it'll setu/gid to them.
10447 Changes in version 0.0.2pre13 - 2003-10-19
10448 o General stability:
10449 - SSL_write no longer fails when it returns WANTWRITE and the number
10450 of bytes in the buf has changed by the next SSL_write call.
10451 - Fix segfault fetching directory when network is down
10452 - Fix a variety of minor memory leaks
10453 - Dirservers reload the fingerprints file on HUP, so I don't have
10454 to take down the network when I approve a new router
10455 - Default server config file has explicit Address line to specify fqdn
10458 - Buffers grow and shrink as needed (Cut process size from 20M to 2M)
10459 - Make listener connections not ever alloc bufs
10461 o Autoconf improvements:
10462 - don't clobber an external CFLAGS in ./configure
10463 - Make install now works
10464 - create var/lib/tor on make install
10465 - autocreate a tor.sh initscript to help distribs
10466 - autocreate the torrc and sample-server-torrc with correct paths
10468 o Log files and Daemonizing now work:
10469 - If --DebugLogFile is specified, log to it at -l debug
10470 - If --LogFile is specified, use it instead of commandline
10471 - If --RunAsDaemon is set, tor forks and backgrounds on startup