This document summarizes new features and bugfixes in each stable release of Tor. If you want to see more detailed descriptions of the changes in each development snapshot, see the ChangeLog file. Changes in version 0.1.1.26 - 2006-12-14 o Security bugfixes: - Stop sending the HttpProxyAuthenticator string to directory servers when directory connections are tunnelled through Tor. - Clients no longer store bandwidth history in the state file. - Do not log introduction points for hidden services if SafeLogging is set. o Minor bugfixes: - Fix an assert failure when a directory authority sets AuthDirRejectUnlisted and then receives a descriptor from an unlisted router (reported by seeess). Changes in version 0.1.1.25 - 2006-11-04 o Major bugfixes: - When a client asks us to resolve (rather than connect to) an address, and we have a cached answer, give them the cached answer. Previously, we would give them no answer at all. - We were building exactly the wrong circuits when we predict hidden service requirements, meaning Tor would have to build all its circuits on demand. - If none of our live entry guards have a high uptime, but we require a guard with a high uptime, try adding a new guard before we give up on the requirement. This patch should make long-lived connections more stable on average. - When testing reachability of our DirPort, don't launch new tests when there's already one in progress -- unreachable servers were stacking up dozens of testing streams. o Security bugfixes: - When the user sends a NEWNYM signal, clear the client-side DNS cache too. Otherwise we continue to act on previous information. o Minor bugfixes: - Avoid a memory corruption bug when creating a hash table for the first time. - Avoid possibility of controller-triggered crash when misusing certain commands from a v0 controller on platforms that do not handle printf("%s",NULL) gracefully. - Avoid infinite loop on unexpected controller input. - Don't log spurious warnings when we see a circuit close reason we don't recognize; it's probably just from a newer version of Tor. - Add Vidalia to the OS X uninstaller script, so when we uninstall Tor/Privoxy we also uninstall Vidalia. Changes in version 0.1.1.24 - 2006-09-29 o Major bugfixes: - Allow really slow clients to not hang up five minutes into their directory downloads (suggested by Adam J. Richter). - Fix major performance regression from 0.1.0.x: instead of checking whether we have enough directory information every time we want to do something, only check when the directory information has changed. This should improve client CPU usage by 25-50%. - Don't crash if, after a server has been running for a while, it can't resolve its hostname. - When a client asks us to resolve (not connect to) an address, and we have a cached answer, give them the cached answer. Previously, we would give them no answer at all. o Minor bugfixes: - Allow Tor to start when RunAsDaemon is set but no logs are set. - Don't crash when the controller receives a third argument to an "extendcircuit" request. - Controller protocol fixes: fix encoding in "getinfo addr-mappings" response; fix error code when "getinfo dir/status/" fails. - Fix configure.in to not produce broken configure files with more recent versions of autoconf. Thanks to Clint for his auto* voodoo. - Fix security bug on NetBSD that could allow someone to force uninitialized RAM to be sent to a server's DNS resolver. This only affects NetBSD and other platforms that do not bounds-check tolower(). - Warn user when using libevent 1.1a or earlier with win32 or kqueue methods: these are known to be buggy. - If we're a directory mirror and we ask for "all" network status documents, we would discard status documents from authorities we don't recognize. Changes in version 0.1.1.23 - 2006-07-30 o Major bugfixes: - Fast Tor servers, especially exit nodes, were triggering asserts due to a bug in handling the list of pending DNS resolves. Some bugs still remain here; we're hunting them. - Entry guards could crash clients by sending unexpected input. - More fixes on reachability testing: if you find yourself reachable, then don't ever make any client requests (so you stop predicting circuits), then hup or have your clock jump, then later your IP changes, you won't think circuits are working, so you won't try to test reachability, so you won't publish. o Minor bugfixes: - Avoid a crash if the controller does a resetconf firewallports and then a setconf fascistfirewall=1. - Avoid an integer underflow when the dir authority decides whether a router is stable: we might wrongly label it stable, and compute a slightly wrong median stability, when a descriptor is published later than now. - Fix a place where we might trigger an assert if we can't build our own server descriptor yet. Changes in version 0.1.1.22 - 2006-07-05 o Major bugfixes: - Fix a big bug that was causing servers to not find themselves reachable if they changed IP addresses. Since only 0.1.1.22+ servers can do reachability testing correctly, now we automatically make sure to test via one of these. - Fix to allow clients and mirrors to learn directory info from descriptor downloads that get cut off partway through. - Directory authorities had a bug in deciding if a newly published descriptor was novel enough to make everybody want a copy -- a few servers seem to be publishing new descriptors many times a minute. o Minor bugfixes: - Fix a rare bug that was causing some servers to complain about "closing wedged cpuworkers" and skip some circuit create requests. - Make the Exit flag in directory status documents actually work. Changes in version 0.1.1.21 - 2006-06-10 o Crash and assert fixes from 0.1.1.20: - Fix a rare crash on Tor servers that have enabled hibernation. - Fix a seg fault on startup for Tor networks that use only one directory authority. - Fix an assert from a race condition that occurs on Tor servers while exiting, where various threads are trying to log that they're exiting, and delete the logs, at the same time. - Make our unit tests pass again on certain obscure platforms. o Other fixes: - Add support for building SUSE RPM packages. - Speed up initial bootstrapping for clients: if we are making our first ever connection to any entry guard, then don't mark it down right after that. - When only one Tor server in the network is labelled as a guard, and we've already picked him, we would cycle endlessly picking him again, being unhappy about it, etc. Now we specifically exclude current guards when picking a new guard. - Servers send create cells more reliably after the TLS connection is established: we were sometimes forgetting to send half of them when we had more than one pending. - If we get a create cell that asks us to extend somewhere, but the Tor server there doesn't match the expected digest, we now send a destroy cell back, rather than silently doing nothing. - Make options->RedirectExit work again. - Make cookie authentication for the controller work again. - Stop being picky about unusual characters in the arguments to mapaddress. It's none of our business. - Add a new config option "TestVia" that lets you specify preferred middle hops to use for test circuits. Perhaps this will let me debug the reachability problems better. o Log / documentation fixes: - If we're a server and some peer has a broken TLS certificate, don't log about it unless ProtocolWarnings is set, i.e., we want to hear about protocol violations by others. - Fix spelling of VirtualAddrNetwork in man page. - Add a better explanation at the top of the autogenerated torrc file about what happened to our old torrc. Changes in version 0.1.1.20 - 2006-05-23 o Crash and assert fixes from 0.1.0.17: - Fix assert bug in close_logs() on exit: when we close and delete logs, remove them all from the global "logfiles" list. - Fix an assert error when we're out of space in the connection_list and we try to post a hidden service descriptor (reported by Peter Palfrader). - Fix a rare assert error when we've tried all intro points for a hidden service and we try fetching the service descriptor again: "Assertion conn->state != AP_CONN_STATE_RENDDESC_WAIT failed". - Setconf SocksListenAddress kills Tor if it fails to bind. Now back out and refuse the setconf if it would fail. - If you specify a relative torrc path and you set RunAsDaemon in your torrc, then it chdir()'s to the new directory. If you then HUP, it tries to load the new torrc location, fails, and exits. The fix: no longer allow a relative path to torrc when using -f. - Check for integer overflows in more places, when adding elements to smartlists. This could possibly prevent a buffer overflow on malicious huge inputs. o Security fixes, major: - When we're printing strings from the network, don't try to print non-printable characters. Now we're safer against shell escape sequence exploits, and also against attacks to fool users into misreading their logs. - Implement entry guards: automatically choose a handful of entry nodes and stick with them for all circuits. Only pick new guards when the ones you have are unsuitable, and if the old guards become suitable again, switch back. This will increase security dramatically against certain end-point attacks. The EntryNodes config option now provides some hints about which entry guards you want to use most; and StrictEntryNodes means to only use those. Fixes CVE-2006-0414. - Implement exit enclaves: if we know an IP address for the destination, and there's a running Tor server at that address which allows exit to the destination, then extend the circuit to that exit first. This provides end-to-end encryption and end-to-end authentication. Also, if the user wants a .exit address or enclave, use 4 hops rather than 3, and cannibalize a general circ for it if you can. - Obey our firewall options more faithfully: . If we can't get to a dirserver directly, try going via Tor. . Don't ever try to connect (as a client) to a place our firewall options forbid. . If we specify a proxy and also firewall options, obey the firewall options even when we're using the proxy: some proxies can only proxy to certain destinations. - Make clients regenerate their keys when their IP address changes. - For the OS X package's modified privoxy config file, comment out the "logfile" line so we don't log everything passed through privoxy. - Our TLS handshakes were generating a single public/private keypair for the TLS context, rather than making a new one for each new connection. Oops. (But we were still rotating them periodically, so it's not so bad.) - When we were cannibalizing a circuit with a particular exit node in mind, we weren't checking to see if that exit node was already present earlier in the circuit. Now we are. - Require server descriptors to list IPv4 addresses -- hostnames are no longer allowed. This also fixes potential vulnerabilities to servers providing hostnames as their address and then preferentially resolving them so they can partition users. - Our logic to decide if the OR we connected to was the right guy was brittle and maybe open to a mitm for invalid routers. o Security fixes, minor: - Adjust tor-spec.txt to parameterize cell and key lengths. Now Ian Goldberg can prove things about our handshake protocol more easily. - Make directory authorities generate a separate "guard" flag to mean "would make a good entry guard". Clients now honor the is_guard flag rather than looking at is_fast or is_stable. - Try to list MyFamily elements by key, not by nickname, and warn if we've not heard of a server. - Start using RAND_bytes rather than RAND_pseudo_bytes from OpenSSL. Also, reseed our entropy every hour, not just at startup. And add entropy in 512-bit chunks, not 160-bit chunks. - Refuse server descriptors where the fingerprint line doesn't match the included identity key. Tor doesn't care, but other apps (and humans) might actually be trusting the fingerprint line. - We used to kill the circuit when we receive a relay command we don't recognize. Now we just drop that cell. - Fix a bug found by Lasse Overlier: when we were making internal circuits (intended to be cannibalized later for rendezvous and introduction circuits), we were picking them so that they had useful exit nodes. There was no need for this, and it actually aids some statistical attacks. - Start treating internal circuits and exit circuits separately. It's important to keep them separate because internal circuits have their last hops picked like middle hops, rather than like exit hops. So exiting on them will break the user's expectations. - Fix a possible way to DoS dirservers. - When the client asked for a rendezvous port that the hidden service didn't want to provide, we were sending an IP address back along with the end cell. Fortunately, it was zero. But stop that anyway. o Packaging improvements: - Implement --with-libevent-dir option to ./configure. Improve search techniques to find libevent, and use those for openssl too. - Fix a couple of bugs in OpenSSL detection. Deal better when there are multiple SSLs installed with different versions. - Avoid warnings about machine/limits.h on Debian GNU/kFreeBSD. - On non-gcc compilers (e.g. Solaris's cc), use "-g -O" instead of "-Wall -g -O2". - Make unit tests (and other invocations that aren't the real Tor) run without launching listeners, creating subdirectories, and so on. - The OS X installer was adding a symlink for tor_resolve but the binary was called tor-resolve (reported by Thomas Hardly). - Now we can target arch and OS in rpm builds (contributed by Phobos). Also make the resulting dist-rpm filename match the target arch. - Apply Matt Ghali's --with-syslog-facility patch to ./configure if you log to syslog and want something other than LOG_DAEMON. - Fix the torify (tsocks) config file to not use Tor for localhost connections. - Start shipping socks-extensions.txt, tor-doc-unix.html, tor-doc-server.html, and stylesheet.css in the tarball. - Stop shipping tor-doc.html, INSTALL, and README in the tarball. They are useless now. - Add Peter Palfrader's contributed check-tor script. It lets you easily check whether a given server (referenced by nickname) is reachable by you. - Add BSD-style contributed startup script "rc.subr" from Peter Thoenen. o Directory improvements -- new directory protocol: - See tor/doc/dir-spec.txt for all the juicy details. Key points: - Authorities and caches publish individual descriptors (by digest, by fingerprint, by "all", and by "tell me yours"). - Clients don't download or use the old directory anymore. Now they download network-statuses from the directory authorities, and fetch individual server descriptors as needed from mirrors. - Clients don't download descriptors of non-running servers. - Download descriptors by digest, not by fingerprint. Caches try to download all listed digests from authorities; clients try to download "best" digests from caches. This avoids partitioning and isolating attacks better. - Only upload a new server descriptor when options change, 18 hours have passed, uptime is reset, or bandwidth changes a lot. - Directory authorities silently throw away new descriptors that haven't changed much if the timestamps are similar. We do this to tolerate older Tor servers that upload a new descriptor every 15 minutes. (It seemed like a good idea at the time.) - Clients choose directory servers from the network status lists, not from their internal list of router descriptors. Now they can go to caches directly rather than needing to go to authorities to bootstrap the first set of descriptors. - When picking a random directory, prefer non-authorities if any are known. - Add a new flag to network-status indicating whether the server can answer v2 directory requests too. - Directory mirrors now cache up to 16 unrecognized network-status docs, so new directory authorities will be cached too. - Stop parsing, storing, or using running-routers output (but mirrors still cache and serve it). - Clients consider a threshold of "versioning" directory authorities before deciding whether to warn the user that he's obsolete. - Authorities publish separate sorted lists of recommended versions for clients and for servers. - Change DirServers config line to note which dirs are v1 authorities. - Put nicknames on the DirServer line, so we can refer to them without requiring all our users to memorize their IP addresses. - Remove option when getting directory cache to see whether they support running-routers; they all do now. Replace it with one to see whether caches support v2 stuff. - Stop listing down or invalid nodes in the v1 directory. This reduces its bulk by about 1/3, and reduces load on mirrors. - Mirrors no longer cache the v1 directory as often. - If we as a directory mirror don't know of any v1 directory authorities, then don't try to cache any v1 directories. o Other directory improvements: - Add lefkada.eecs.harvard.edu and tor.dizum.com as fourth and fifth authoritative directory servers. - Directory authorities no longer require an open connection from a server to consider him "reachable". We need this change because when we add new directory authorities, old servers won't know not to hang up on them. - Dir authorities now do their own external reachability testing of each server, and only list as running the ones they found to be reachable. We also send back warnings to the server's logs if it uploads a descriptor that we already believe is unreachable. - Spread the directory authorities' reachability testing over the entire testing interval, so we don't try to do 500 TLS's at once every 20 minutes. - Make the "stable" router flag in network-status be the median of the uptimes of running valid servers, and make clients pay attention to the network-status flags. Thus the cutoff adapts to the stability of the network as a whole, making IRC, IM, etc connections more reliable. - Make the v2 dir's "Fast" flag based on relative capacity, just like "Stable" is based on median uptime. Name everything in the top 7/8 Fast, and only the top 1/2 gets to be a Guard. - Retry directory requests if we fail to get an answer we like from a given dirserver (we were retrying before, but only if we fail to connect). - Return a robots.txt on our dirport to discourage google indexing. o Controller protocol improvements: - Revised controller protocol (version 1) that uses ascii rather than binary: tor/doc/control-spec.txt. Add supporting libraries in python and java and c# so you can use the controller from your applications without caring how our protocol works. - Allow the DEBUG controller event to work again. Mark certain log entries as "don't tell this to controllers", so we avoid cycles. - New controller function "getinfo accounting", to ask how many bytes we've used in this time period. - Add a "resetconf" command so you can set config options like AllowUnverifiedNodes and LongLivedPorts to "". Also, if you give a config option in the torrc with no value, then it clears it entirely (rather than setting it to its default). - Add a "getinfo config-file" to tell us where torrc is. Also expose guard nodes, config options/names. - Add a "quit" command (when when using the controller manually). - Add a new signal "newnym" to "change pseudonyms" -- that is, to stop using any currently-dirty circuits for new streams, so we don't link new actions to old actions. This also occurs on HUP or "signal reload". - If we would close a stream early (e.g. it asks for a .exit that we know would refuse it) but the LeaveStreamsUnattached config option is set by the controller, then don't close it. - Add a new controller event type "authdir_newdescs" that allows controllers to get all server descriptors that were uploaded to a router in its role as directory authority. - New controller option "getinfo desc/all-recent" to fetch the latest server descriptor for every router that Tor knows about. - Fix the controller's "attachstream 0" command to treat conn like it just connected, doing address remapping, handling .exit and .onion idioms, and so on. Now we're more uniform in making sure that the controller hears about new and closing connections. - Permit transitioning from ORPort==0 to ORPort!=0, and back, from the controller. Also, rotate dns and cpu workers if the controller changes options that will affect them; and initialize the dns worker cache tree whether or not we start out as a server. - Add a new circuit purpose 'controller' to let the controller ask for a circuit that Tor won't try to use. Extend the "extendcircuit" controller command to let you specify the purpose if you're starting a new circuit. Add a new "setcircuitpurpose" controller command to let you change a circuit's purpose after it's been created. - Let the controller ask for "getinfo dir/server/foo" so it can ask directly rather than connecting to the dir port. "getinfo dir/status/foo" also works, but currently only if your DirPort is enabled. - Let the controller tell us about certain router descriptors that it doesn't want Tor to use in circuits. Implement "setrouterpurpose" and modify "+postdescriptor" to do this. - If the controller's *setconf commands fail, collect an error message in a string and hand it back to the controller -- don't just tell them to go read their logs. o Scalability, resource management, and performance: - Fix a major load balance bug: we were round-robin reading in 16 KB chunks, and servers with bandwidthrate of 20 KB, while downloading a 600 KB directory, would starve their other connections. Now we try to be a bit more fair. - Be more conservative about whether to advertise our DirPort. The main change is to not advertise if we're running at capacity and either a) we could hibernate ever or b) our capacity is low and we're using a default DirPort. - We weren't cannibalizing circuits correctly for CIRCUIT_PURPOSE_C_ESTABLISH_REND and CIRCUIT_PURPOSE_S_ESTABLISH_INTRO, so we were being forced to build those from scratch. This should make hidden services faster. - Predict required circuits better, with an eye toward making hidden services faster on the service end. - Compress exit policies even more: look for duplicate lines and remove them. - Generate 18.0.0.0/8 address policy format in descs when we can; warn when the mask is not reducible to a bit-prefix. - There used to be two ways to specify your listening ports in a server descriptor: on the "router" line and with a separate "ports" line. Remove support for the "ports" line. - Reduce memory requirements in our structs by changing the order of fields. Replace balanced trees with hash tables. Inline bottleneck smartlist functions. Add a "Map from digest to void*" abstraction so we can do less hex encoding/decoding, and use it in router_get_by_digest(). Many other CPU and memory improvements. - Allow tor_gzip_uncompress to extract as much as possible from truncated compressed data. Try to extract as many descriptors as possible from truncated http responses (when purpose is DIR_PURPOSE_FETCH_ROUTERDESC). - Make circ->onionskin a pointer, not a static array. moria2 was using 125000 circuit_t's after it had been up for a few weeks, which translates to 20+ megs of wasted space. - The private half of our EDH handshake keys are now chosen out of 320 bits, not 1024 bits. (Suggested by Ian Goldberg.) - Stop doing the complex voodoo overkill checking for insecure Diffie-Hellman keys. Just check if it's in [2,p-2] and be happy. - Do round-robin writes for TLS of at most 16 kB per write. This might be more fair on loaded Tor servers. - Do not use unaligned memory access on alpha, mips, or mipsel. It *works*, but is very slow, so we treat them as if it doesn't. o Other bugfixes and improvements: - Start storing useful information to $DATADIR/state, so we can remember things across invocations of Tor. Retain unrecognized lines so we can be forward-compatible, and write a TorVersion line so we can be backward-compatible. - If ORPort is set, Address is not explicitly set, and our hostname resolves to a private IP address, try to use an interface address if it has a public address. Now Windows machines that think of themselves as localhost can guess their address. - Regenerate our local descriptor if it's dirty and we try to use it locally (e.g. if it changes during reachability detection). This was causing some Tor servers to keep publishing the same initial descriptor forever. - Tor servers with dynamic IP addresses were needing to wait 18 hours before they could start doing reachability testing using the new IP address and ports. This is because they were using the internal descriptor to learn what to test, yet they were only rebuilding the descriptor once they decided they were reachable. - It turns out we couldn't bootstrap a network since we added reachability detection in 0.1.0.1-rc. Good thing the Tor network has never gone down. Add an AssumeReachable config option to let servers and authorities bootstrap. When we're trying to build a high-uptime or high-bandwidth circuit but there aren't enough suitable servers, try being less picky rather than simply failing. - Newly bootstrapped Tor networks couldn't establish hidden service circuits until they had nodes with high uptime. Be more tolerant. - Really busy servers were keeping enough circuits open on stable connections that they were wrapping around the circuit_id space. (It's only two bytes.) This exposed a bug where we would feel free to reuse a circuit_id even if it still exists but has been marked for close. Try to fix this bug. Some bug remains. - When we fail to bind or listen on an incoming or outgoing socket, we now close it before refusing, rather than just leaking it. (Thanks to Peter Palfrader for finding.) - Fix a file descriptor leak in start_daemon(). - On Windows, you can't always reopen a port right after you've closed it. So change retry_listeners() to only close and re-open ports that have changed. - Workaround a problem with some http proxies that refuse GET requests that specify "Content-Length: 0". Reported by Adrian. - Recover better from TCP connections to Tor servers that are broken but don't tell you (it happens!); and rotate TLS connections once a week. - Fix a scary-looking but apparently harmless bug where circuits would sometimes start out in state CIRCUIT_STATE_OR_WAIT at servers, and never switch to state CIRCUIT_STATE_OPEN. - Check for even more Windows version flags when writing the platform string in server descriptors, and note any we don't recognize. - Add reasons to DESTROY and RELAY_TRUNCATED cells, so clients can get a better idea of why their circuits failed. Not used yet. - Add TTLs to RESOLVED, CONNECTED, and END_REASON_EXITPOLICY cells. We don't use them yet, but maybe one day our DNS resolver will be able to discover them. - Let people type "tor --install" as well as "tor -install" when they want to make it an NT service. - Looks like we were never delivering deflated (i.e. compressed) running-routers lists, even when asked. Oops. - We were leaking some memory every time the client changed IPs. - Clean up more of the OpenSSL memory when exiting, so we can detect memory leaks better. - Never call free() on tor_malloc()d memory. This will help us use dmalloc to detect memory leaks. - Some Tor servers process billions of cells per day. These statistics are now uint64_t's. - Check [X-]Forwarded-For headers in HTTP requests when generating log messages. This lets people run dirservers (and caches) behind Apache but still know which IP addresses are causing warnings. - Fix minor integer overflow in calculating when we expect to use up our bandwidth allocation before hibernating. - Lower the minimum required number of file descriptors to 1000, so we can have some overhead for Valgrind on Linux, where the default ulimit -n is 1024. - Stop writing the "router.desc" file, ever. Nothing uses it anymore, and its existence is confusing some users. o Config option fixes: - Add a new config option ExitPolicyRejectPrivate which defaults to on. Now all exit policies will begin with rejecting private addresses, unless the server operator explicitly turns it off. - Bump the default bandwidthrate to 3 MB, and burst to 6 MB. - Add new ReachableORAddresses and ReachableDirAddresses options that understand address policies. FascistFirewall is now a synonym for "ReachableORAddresses *:443", "ReachableDirAddresses *:80". - Start calling it FooListenAddress rather than FooBindAddress, since few of our users know what it means to bind an address or port. - If the user gave Tor an odd number of command-line arguments, we were silently ignoring the last one. Now we complain and fail. This wins the oldest-bug prize -- this bug has been present since November 2002, as released in Tor 0.0.0. - If you write "HiddenServicePort 6667 127.0.0.1 6668" in your torrc rather than "HiddenServicePort 6667 127.0.0.1:6668", it would silently ignore the 6668. - If we get a linelist or linelist_s config option from the torrc, e.g. ExitPolicy, and it has no value, warn and skip rather than silently resetting it to its default. - Setconf was appending items to linelists, not clearing them. - Add MyFamily to torrc.sample in the server section, so operators will be more likely to learn that it exists. - Make ContactInfo mandatory for authoritative directory servers. - MaxConn has been obsolete for a while now. Document the ConnLimit config option, which is a *minimum* number of file descriptors that must be available else Tor refuses to start. - Get rid of IgnoreVersion undocumented config option, and make us only warn, never exit, when we're running an obsolete version. - Make MonthlyAccountingStart config option truly obsolete now. - Correct the man page entry on TrackHostExitsExpire. - Let directory authorities start even if they don't specify an Address config option. - Change "AllowUnverifiedNodes" to "AllowInvalidNodes", to reflect the updated flags in our v2 dir protocol. o Config option features: - Add a new config option FastFirstHopPK (on by default) so clients do a trivial crypto handshake for their first hop, since TLS has already taken care of confidentiality and authentication. - Let the user set ControlListenAddress in the torrc. This can be dangerous, but there are some cases (like a secured LAN) where it makes sense. - New config options to help controllers: FetchServerDescriptors and FetchHidServDescriptors for whether to fetch server info and hidserv info or let the controller do it, and PublishServerDescriptor and PublishHidServDescriptors. - Also let the controller set the __AllDirActionsPrivate config option if you want all directory fetches/publishes to happen via Tor (it assumes your controller bootstraps your circuits). - Add "HardwareAccel" config option: support for crypto hardware accelerators via OpenSSL. Off by default, until we find somebody smart who can test it for us. (It appears to produce seg faults in at least some cases.) - New config option "AuthDirRejectUnlisted" for directory authorities as a panic button: if we get flooded with unusable servers we can revert to only listing servers in the approved-routers file. - Directory authorities can now reject/invalidate by key and IP, with the config options "AuthDirInvalid" and "AuthDirReject", or by marking a fingerprint as "!reject" or "!invalid" (as its nickname) in the approved-routers file. This is useful since currently we automatically list servers as running and usable even if we know they're jerks. - Add a new config option TestSocks so people can see whether their applications are using socks4, socks4a, socks5-with-ip, or socks5-with-fqdn. This way they don't have to keep mucking with tcpdump and wondering if something got cached somewhere. - Add "private:*" as an alias in configuration for policies. Now you can simplify your exit policy rather than needing to list every single internal or nonroutable network space. - Accept "private:*" in routerdesc exit policies; not generated yet because older Tors do not understand it. - Add configuration option "V1AuthoritativeDirectory 1" which moria1, moria2, and tor26 have set. - Implement an option, VirtualAddrMask, to set which addresses get handed out in response to mapaddress requests. This works around a bug in tsocks where 127.0.0.0/8 is never socksified. - Add a new config option FetchUselessDescriptors, off by default, for when you plan to run "exitlist" on your client and you want to know about even the non-running descriptors. - SocksTimeout: How long do we let a socks connection wait unattached before we fail it? - CircuitBuildTimeout: Cull non-open circuits that were born at least this many seconds ago. - CircuitIdleTimeout: Cull open clean circuits that were born at least this many seconds ago. - New config option SafeSocks to reject all application connections using unsafe socks protocols. Defaults to off. o Improved and clearer log messages: - Reduce clutter in server logs. We're going to try to make them actually usable now. New config option ProtocolWarnings that lets you hear about how _other Tors_ are breaking the protocol. Off by default. - Divide log messages into logging domains. Once we put some sort of interface on this, it will let people looking at more verbose log levels specify the topics they want to hear more about. - Log server fingerprint on startup, so new server operators don't have to go hunting around their filesystem for it. - Provide dire warnings to any users who set DirServer manually; move it out of torrc.sample and into torrc.complete. - Make the log message less scary when all the dirservers are temporarily unreachable. - When tor_socketpair() fails in Windows, give a reasonable Windows-style errno back. - Improve tor_gettimeofday() granularity on windows. - We were printing the number of idle dns workers incorrectly when culling them. - Handle duplicate lines in approved-routers files without warning. - We were whining about using socks4 or socks5-with-local-lookup even when it's an IP address in the "virtual" range we designed exactly for this case. - Check for named servers when looking them up by nickname; warn when we're calling a non-named server by its nickname; don't warn twice about the same name. - Downgrade the dirserver log messages when whining about unreachability. - Correct "your server is reachable" log entries to indicate that it was self-testing that told us so. - If we're trying to be a Tor server and running Windows 95/98/ME as a server, explain that we'll likely crash. - Provide a more useful warn message when our onion queue gets full: the CPU is too slow or the exit policy is too liberal. - Don't warn when we receive a 503 from a dirserver/cache -- this will pave the way for them being able to refuse if they're busy. - When we fail to bind a listener, try to provide a more useful log message: e.g., "Is Tor already running?" - Only start testing reachability once we've established a circuit. This will make startup on dir authorities less noisy. - Don't try to upload hidden service descriptors until we have established a circuit. - Tor didn't warn when it failed to open a log file. - Warn when listening on a public address for socks. We suspect a lot of people are setting themselves up as open socks proxies, and they have no idea that jerks on the Internet are using them, since they simply proxy the traffic into the Tor network. - Give a useful message when people run Tor as the wrong user, rather than telling them to start chowning random directories. - Fix a harmless bug that was causing Tor servers to log "Got an end because of misc error, but we're not an AP. Closing." - Fix wrong log message when you add a "HiddenServiceNodes" config line without any HiddenServiceDir line (reported by Chris Thomas). - Directory authorities now stop whining so loudly about bad descriptors that they fetch from other dirservers. So when there's a log complaint, it's for sure from a freshly uploaded descriptor. - When logging via syslog, include the pid whenever we provide a log entry. Suggested by Todd Fries. - When we're shutting down and we do something like try to post a server descriptor or rendezvous descriptor, don't complain that we seem to be unreachable. Of course we are, we're shutting down. - Change log line for unreachability to explicitly suggest /etc/hosts as the culprit. Also make it clearer what IP address and ports we're testing for reachability. - Put quotes around user-supplied strings when logging so users are more likely to realize if they add bad characters (like quotes) to the torrc. - NT service patch from Matt Edman to improve error messages on Win32. Changes in version 0.1.0.17 - 2006-02-17 o Crash bugfixes on 0.1.0.x: - When servers with a non-zero DirPort came out of hibernation, sometimes they would trigger an assert. o Other important bugfixes: - On platforms that don't have getrlimit (like Windows), we were artificially constraining ourselves to a max of 1024 connections. Now just assume that we can handle as many as 15000 connections. Hopefully this won't cause other problems. o Backported features: - When we're a server, a client asks for an old-style directory, and our write bucket is empty, don't give it to him. This way small servers can continue to serve the directory *sometimes*, without getting overloaded. - Whenever you get a 503 in response to a directory fetch, try once more. This will become important once servers start sending 503's whenever they feel busy. - Fetch a new directory every 120 minutes, not every 40 minutes. Now that we have hundreds of thousands of users running the old directory algorithm, it's starting to hurt a lot. - Bump up the period for forcing a hidden service descriptor upload from 20 minutes to 1 hour. Changes in version 0.1.0.16 - 2006-01-02 o Crash bugfixes on 0.1.0.x: - On Windows, build with a libevent patch from "I-M Weasel" to avoid corrupting the heap, losing FDs, or crashing when we need to resize the fd_sets. (This affects the Win32 binaries, not Tor's sources.) - It turns out sparc64 platforms crash on unaligned memory access too -- so detect and avoid this. - Handle truncated compressed data correctly (by detecting it and giving an error). - Fix possible-but-unlikely free(NULL) in control.c. - When we were closing connections, there was a rare case that stomped on memory, triggering seg faults and asserts. - Avoid potential infinite recursion when building a descriptor. (We don't know that it ever happened, but better to fix it anyway.) - We were neglecting to unlink marked circuits from soon-to-close OR connections, which caused some rare scribbling on freed memory. - Fix a memory stomping race bug when closing the joining point of two rendezvous circuits. - Fix an assert in time parsing found by Steven Murdoch. o Other bugfixes on 0.1.0.x: - When we're doing reachability testing, provide more useful log messages so the operator knows what to expect. - Do not check whether DirPort is reachable when we are suppressing advertising it because of hibernation. - When building with -static or on Solaris, we sometimes needed -ldl. - One of the dirservers (tor26) changed its IP address. - When we're deciding whether a stream has enough circuits around that can handle it, count the freshly dirty ones and not the ones that are so dirty they won't be able to handle it. - When we're expiring old circuits, we had a logic error that caused us to close new rendezvous circuits rather than old ones. - Give a more helpful log message when you try to change ORPort via the controller: you should upgrade Tor if you want that to work. - We were failing to parse Tor versions that start with "Tor ". - Tolerate faulty streams better: when a stream fails for reason exitpolicy, stop assuming that the router is lying about his exit policy. When a stream fails for reason misc, allow it to retry just as if it was resolvefailed. When a stream has failed three times, reset its failure count so we can try again and get all three tries. Changes in version 0.1.0.15 - 2005-09-23 o Bugfixes on 0.1.0.x: - Reject ports 465 and 587 (spam targets) in default exit policy. - Don't crash when we don't have any spare file descriptors and we try to spawn a dns or cpu worker. - Get rid of IgnoreVersion undocumented config option, and make us only warn, never exit, when we're running an obsolete version. - Don't try to print a null string when your server finds itself to be unreachable and the Address config option is empty. - Make the numbers in read-history and write-history into uint64s, so they don't overflow and publish negatives in the descriptor. - Fix a minor memory leak in smartlist_string_remove(). - We were only allowing ourselves to upload a server descriptor at most every 20 minutes, even if it changed earlier than that. - Clean up log entries that pointed to old URLs. Changes in version 0.1.0.14 - 2005-08-08 o Bugfixes on 0.1.0.x: - Fix the other half of the bug with crypto handshakes (CVE-2005-2643). - Fix an assert trigger if you send a 'signal term' via the controller when it's listening for 'event info' messages. Changes in version 0.1.0.13 - 2005-08-04 o Bugfixes on 0.1.0.x: - Fix a critical bug in the security of our crypto handshakes. - Fix a size_t underflow in smartlist_join_strings2() that made it do bad things when you hand it an empty smartlist. - Fix Windows installer to ship Tor license (thanks to Aphex for pointing out this oversight) and put a link to the doc directory in the start menu. - Explicitly set no-unaligned-access for sparc: it turns out the new gcc's let you compile broken code, but that doesn't make it not-broken. Changes in version 0.1.0.12 - 2005-07-18 o New directory servers: - tor26 has changed IP address. o Bugfixes on 0.1.0.x: - Fix a possible double-free in tor_gzip_uncompress(). - When --disable-threads is set, do not search for or link against pthreads libraries. - Don't trigger an assert if an authoritative directory server claims its dirport is 0. - Fix bug with removing Tor as an NT service: some people were getting "The service did not return an error." Thanks to Matt Edman for the fix. Changes in version 0.1.0.11 - 2005-06-30 o Bugfixes on 0.1.0.x: - Fix major security bug: servers were disregarding their exit policies if clients behaved unexpectedly. - Make OS X init script check for missing argument, so we don't confuse users who invoke it incorrectly. - Fix a seg fault in "tor --hash-password foo". - The MAPADDRESS control command was broken. Changes in version 0.1.0.10 - 2005-06-14 o Fixes on Win32: - Make NT services work and start on startup on Win32 (based on patch by Matt Edman). See the FAQ entry for details. - Make 'platform' string in descriptor more accurate for Win32 servers, so it's not just "unknown platform". - REUSEADDR on normal platforms means you can rebind to the port right after somebody else has let it go. But REUSEADDR on Win32 means you can bind to the port _even when somebody else already has it bound_! So, don't do that on Win32. - Clean up the log messages when starting on Win32 with no config file. - Allow seeding the RNG on Win32 even when you're not running as Administrator. If seeding the RNG on Win32 fails, quit. o Assert / crash bugs: - Refuse relay cells that claim to have a length larger than the maximum allowed. This prevents a potential attack that could read arbitrary memory (e.g. keys) from an exit server's process (CVE-2005-2050). - If unofficial Tor clients connect and send weird TLS certs, our Tor server triggers an assert. Stop asserting, and start handling TLS errors better in other situations too. - Fix a race condition that can trigger an assert when we have a pending create cell and an OR connection attempt fails. o Resource leaks: - Use pthreads for worker processes rather than forking. This was forced because when we forked, we ended up wasting a lot of duplicate ram over time. - Also switch to foo_r versions of some library calls to allow reentry and threadsafeness. - Implement --disable-threads configure option. Disable threads on netbsd and openbsd by default, because they have no reentrant resolver functions (!), and on solaris since it has other threading issues. - Fix possible bug on threading platforms (e.g. win32) which was leaking a file descriptor whenever a cpuworker or dnsworker died. - Fix a minor memory leak when somebody establishes an introduction point at your Tor server. - Fix possible memory leak in tor_lookup_hostname(). (Thanks to Adam Langley.) - Add ./configure --with-dmalloc option, to track memory leaks. - And try to free all memory on closing, so we can detect what we're leaking. o Protocol correctness: - When we've connected to an OR and handshaked but didn't like the result, we were closing the conn without sending destroy cells back for pending circuits. Now send those destroys. - Start sending 'truncated' cells back rather than destroy cells if the circuit closes in front of you. This means we won't have to abandon partially built circuits. - Handle changed router status correctly when dirserver reloads fingerprint file. We used to be dropping all unverified descriptors right then. The bug was hidden because we would immediately fetch a directory from another dirserver, which would include the descriptors we just dropped. - Revise tor-spec to add more/better stream end reasons. - Revise all calls to connection_edge_end to avoid sending 'misc', and to take errno into account where possible. - Client now retries when streams end early for 'hibernating' or 'resource limit' reasons, rather than failing them. - Try to be more zealous about calling connection_edge_end when things go bad with edge conns in connection.c. o Robustness improvements: - Better handling for heterogeneous / unreliable nodes: - Annotate circuits with whether they aim to contain high uptime nodes and/or high capacity nodes. When building circuits, choose appropriate nodes. - This means that every single node in an intro rend circuit, not just the last one, will have a minimum uptime. - New config option LongLivedPorts to indicate application streams that will want high uptime circuits. - Servers reset uptime when a dir fetch entirely fails. This hopefully reflects stability of the server's network connectivity. - If somebody starts his tor server in Jan 2004 and then fixes his clock, don't make his published uptime be a year. - Reset published uptime when we wake up from hibernation. - Introduce a notion of 'internal' circs, which are chosen without regard to the exit policy of the last hop. Intro and rendezvous circs must be internal circs, to avoid leaking information. Resolve and connect streams can use internal circs if they want. - New circuit pooling algorithm: keep track of what destination ports we've used recently (start out assuming we'll want to use 80), and make sure to have enough circs around to satisfy these ports. Also make sure to have 2 internal circs around if we've required internal circs lately (and with high uptime if we've seen that lately too). - Turn addr_policy_compare from a tristate to a quadstate; this should help address our "Ah, you allow 1.2.3.4:80. You are a good choice for google.com" problem. - When a client asks us for a dir mirror and we don't have one, launch an attempt to get a fresh one. - First cut at support for "create-fast" cells. Clients can use these when extending to their first hop, since the TLS already provides forward secrecy and authentication. Not enabled on clients yet. o Reachability testing. - Your Tor server will automatically try to see if its ORPort and DirPort are reachable from the outside, and it won't upload its descriptor until it decides at least ORPort is reachable (when DirPort is not yet found reachable, publish it as zero). - When building testing circs for ORPort testing, use only high-bandwidth nodes, so fewer circuits fail. - Notice when our IP changes, and reset stats/uptime/reachability. - Authdirservers don't do ORPort reachability detection, since they're in clique mode, so it will be rare to find a server not already connected to them. - Authdirservers now automatically approve nodes running 0.1.0.2-rc or later. o Dirserver fixes: - Now we allow two unverified servers with the same nickname but different keys. But if a nickname is verified, only that nickname+key are allowed. - If you're an authdirserver connecting to an address:port, and it's not the OR you were expecting, forget about that descriptor. If he *was* the one you were expecting, then forget about all other descriptors for that address:port. - Allow servers to publish descriptors from 12 hours in the future. Corollary: only whine about clock skew from the dirserver if he's a trusted dirserver (since now even verified servers could have quite wrong clocks). - Require servers that use the default dirservers to have public IP addresses. We have too many servers that are configured with private IPs and their admins never notice the log entries complaining that their descriptors are being rejected. o Efficiency improvements: - Use libevent. Now we can use faster async cores (like epoll, kpoll, and /dev/poll), and hopefully work better on Windows too. - Apple's OS X 10.4.0 ships with a broken kqueue API, and using kqueue on 10.3.9 causes kernel panics. Don't use kqueue on OS X. - Find libevent even if it's hiding in /usr/local/ and your CFLAGS and LDFLAGS don't tell you to look there. - Be able to link with libevent as a shared library (the default after 1.0d), even if it's hiding in /usr/local/lib and even if you haven't added /usr/local/lib to your /etc/ld.so.conf, assuming you're running gcc. Otherwise fail and give a useful error message. - Switch to a new buffer management algorithm, which tries to avoid reallocing and copying quite as much. In first tests it looks like it uses *more* memory on average, but less cpu. - Switch our internal buffers implementation to use a ring buffer, to hopefully improve performance for fast servers a lot. - Reenable the part of the code that tries to flush as soon as an OR outbuf has a full TLS record available. Perhaps this will make OR outbufs not grow as huge except in rare cases, thus saving lots of CPU time plus memory. - Improve performance for dirservers: stop re-parsing the whole directory every time you regenerate it. - Keep a big splay tree of (circid,orconn)->circuit mappings to make it much faster to look up a circuit for each relay cell. - Remove most calls to assert_all_pending_dns_resolves_ok(), since they're eating our cpu on exit nodes. - Stop wasting time doing a case insensitive comparison for every dns name every time we do any lookup. Canonicalize the names to lowercase when you first see them. o Hidden services: - Handle unavailable hidden services better. Handle slow or busy hidden services better. - Cannibalize GENERAL circs to be C_REND, C_INTRO, S_INTRO, and S_REND circ as necessary, if there are any completed ones lying around when we try to launch one. - Make hidden services try to establish a rendezvous for 30 seconds after fetching the descriptor, rather than for n (where n=3) attempts to build a circuit. - Adjust maximum skew and age for rendezvous descriptors: let skew be 48 hours rather than 90 minutes. - Reject malformed .onion addresses rather then passing them on as normal web requests. o Controller: - More Tor controller support. See http://tor.eff.org/doc/control-spec.txt for all the new features, including signals to emulate unix signals from any platform; redirectstream; extendcircuit; mapaddress; getinfo; postdescriptor; closestream; closecircuit; etc. - Encode hashed controller passwords in hex instead of base64, to make it easier to write controllers. - Revise control spec and implementation to allow all log messages to be sent to controller with their severities intact (suggested by Matt Edman). Disable debug-level logs while delivering a debug-level log to the controller, to prevent loop. Update TorControl to handle new log event types. o New config options/defaults: - Begin scrubbing sensitive strings from logs by default. Turn off the config option SafeLogging if you need to do debugging. - New exit policy: accept most low-numbered ports, rather than rejecting most low-numbered ports. - Put a note in the torrc about abuse potential with the default exit policy. - Add support for CONNECTing through https proxies, with "HttpsProxy" config option. - Add HttpProxyAuthenticator and HttpsProxyAuthenticator support based on patch from Adam Langley (basic auth only). - Bump the default BandwidthRate from 1 MB to 2 MB, to accommodate the fast servers that have been joining lately. (Clients are now willing to load balance over up to 2 MB of advertised bandwidth capacity too.) - New config option MaxAdvertisedBandwidth which lets you advertise a low bandwidthrate (to not attract as many circuits) while still allowing a higher bandwidthrate in reality. - Require BandwidthRate to be at least 20kB/s for servers. - Add a NoPublish config option, so you can be a server (e.g. for testing running Tor servers in other Tor networks) without publishing your descriptor to the primary dirservers. - Add a new AddressMap config directive to rewrite incoming socks addresses. This lets you, for example, declare an implicit required exit node for certain sites. - Add a new TrackHostExits config directive to trigger addressmaps for certain incoming socks addresses -- for sites that break when your exit keeps changing (based on patch from Mike Perry). - Split NewCircuitPeriod option into NewCircuitPeriod (30 secs), which describes how often we retry making new circuits if current ones are dirty, and MaxCircuitDirtiness (10 mins), which describes how long we're willing to make use of an already-dirty circuit. - Change compiled-in SHUTDOWN_WAIT_LENGTH from a fixed 30 secs to a config option "ShutdownWaitLength" (when using kill -INT on servers). - Fix an edge case in parsing config options: if they say "--" on the commandline, it's not a config option (thanks weasel). - New config option DirAllowPrivateAddresses for authdirservers. Now by default they refuse router descriptors that have non-IP or private-IP addresses. - Change DirFetchPeriod/StatusFetchPeriod to have a special "Be smart" default value: low for servers and high for clients. - Some people were putting "Address " in their torrc, and they had a buggy resolver that resolved " " to 0.0.0.0. Oops. - If DataDir is ~/.tor, and that expands to /.tor, then default to LOCALSTATEDIR/tor instead. - Implement --verify-config command-line option to check if your torrc is valid without actually launching Tor. o Logging improvements: - When dirservers refuse a server descriptor, we now log its contactinfo, platform, and the poster's IP address. - Only warn once per nickname from add_nickname_list_to_smartlist() per failure, so an entrynode or exitnode choice that's down won't yell so much. - When we're connecting to an OR and he's got a different nickname/key than we were expecting, only complain loudly if we're an OP or a dirserver. Complaining loudly to the OR admins just confuses them. - Whine at you if you're a server and you don't set your contactinfo. - Warn when exit policy implicitly allows local addresses. - Give a better warning when some other server advertises an ORPort that is actually an apache running ssl. - If we get an incredibly skewed timestamp from a dirserver mirror that isn't a verified OR, don't warn -- it's probably him that's wrong. - When a dirserver causes you to give a warn, mention which dirserver it was. - Initialize libevent later in the startup process, so the logs are already established by the time we start logging libevent warns. - Use correct errno on win32 if libevent fails. - Check and warn about known-bad/slow libevent versions. - Stop warning about sigpipes in the logs. We're going to pretend that getting these occassionally is normal and fine. o New contrib scripts: - New experimental script tor/contrib/exitlist: a simple python script to parse directories and find Tor nodes that exit to listed addresses/ports. - New experimental script tor/contrib/ExerciseServer.py (needs more work) that uses the controller interface to build circuits and fetch pages over them. This will help us bootstrap servers that have lots of capacity but haven't noticed it yet. - New experimental script tor/contrib/PathDemo.py (needs more work) that uses the controller interface to let you choose whole paths via addresses like "...path" - New contributed script "privoxy-tor-toggle" to toggle whether Privoxy uses Tor. Seems to be configured for Debian by default. - Have torctl.in/tor.sh.in check for location of su binary (needed on FreeBSD) o Misc bugfixes: - chdir() to your datadirectory at the *end* of the daemonize process, not the beginning. This was a problem because the first time you run tor, if your datadir isn't there, and you have runasdaemon set to 1, it will try to chdir to it before it tries to create it. Oops. - Fix several double-mark-for-close bugs, e.g. where we were finding a conn for a cell even if that conn is already marked for close. - Stop most cases of hanging up on a socks connection without sending the socks reject. - Fix a bug in the RPM package: set home directory for _tor to something more reasonable when first installing. - Stop putting nodename in the Platform string in server descriptors. It doesn't actually help, and it is confusing/upsetting some people. - When using preferred entry or exit nodes, ignore whether the circuit wants uptime or capacity. They asked for the nodes, they get the nodes. - Tie MAX_DIR_SIZE to MAX_BUF_SIZE, so now directory sizes won't get artificially capped at 500kB. - Cache local dns resolves correctly even when they're .exit addresses. - If we're hibernating and we get a SIGINT, exit immediately. - tor-resolve requests were ignoring .exit if there was a working circuit they could use instead. - Pay more attention to the ClientOnly config option. - Resolve OS X installer bugs: stop claiming to be 0.0.9.2 in certain installer screens; and don't put stuff into StartupItems unless the user asks you to. o Misc features: - Rewrite address "serifos.exit" to "externalIP.serifos.exit" rather than just rejecting it. - If our clock jumps forward by 100 seconds or more, assume something has gone wrong with our network and abandon all not-yet-used circs. - When an application is using socks5, give him the whole variety of potential socks5 responses (connect refused, host unreachable, etc), rather than just "success" or "failure". - A more sane version numbering system. See http://tor.eff.org/cvs/tor/doc/version-spec.txt for details. - Change version parsing logic: a version is "obsolete" if it is not recommended and (1) there is a newer recommended version in the same series, or (2) there are no recommended versions in the same series, but there are some recommended versions in a newer series. A version is "new" if it is newer than any recommended version in the same series. - Report HTTP reasons to client when getting a response from directory servers -- so you can actually know what went wrong. - Reject odd-looking addresses at the client (e.g. addresses that contain a colon), rather than having the server drop them because they're malformed. - Stop publishing socksport in the directory, since it's not actually meant to be public. For compatibility, publish a 0 there for now. - Since we ship our own Privoxy on OS X, tweak it so it doesn't write cookies to disk and doesn't log each web request to disk. (Thanks to Brett Carrington for pointing this out.) - Add OSX uninstall instructions. An actual uninstall script will come later. - Add "opt hibernating 1" to server descriptor to make it clearer whether the server is hibernating. Changes in version 0.0.9.10 - 2005-06-16 o Bugfixes on 0.0.9.x (backported from 0.1.0.10): - Refuse relay cells that claim to have a length larger than the maximum allowed. This prevents a potential attack that could read arbitrary memory (e.g. keys) from an exit server's process (CVE-2005-2050). Changes in version 0.0.9.9 - 2005-04-23 o Bugfixes on 0.0.9.x: - If unofficial Tor clients connect and send weird TLS certs, our Tor server triggers an assert. This release contains a minimal backport from the broader fix that we put into 0.1.0.4-rc. Changes in version 0.0.9.8 - 2005-04-07 o Bugfixes on 0.0.9.x: - We have a bug that I haven't found yet. Sometimes, very rarely, cpuworkers get stuck in the 'busy' state, even though the cpuworker thinks of itself as idle. This meant that no new circuits ever got established. Here's a workaround to kill any cpuworker that's been busy for more than 100 seconds. Changes in version 0.0.9.7 - 2005-04-01 o Bugfixes on 0.0.9.x: - Fix another race crash bug (thanks to Glenn Fink for reporting). - Compare identity to identity, not to nickname, when extending to a router not already in the directory. This was preventing us from extending to unknown routers. Oops. - Make sure to create OS X Tor user in <500 range, so we aren't creating actual system users. - Note where connection-that-hasn't-sent-end was marked, and fix a few really loud instances of this harmless bug (it's fixed more in 0.1.0.x). Changes in version 0.0.9.6 - 2005-03-24 o Bugfixes on 0.0.9.x (crashes and asserts): - Add new end stream reasons to maintainance branch. Fix bug where reason (8) could trigger an assert. Prevent bug from recurring. - Apparently win32 stat wants paths to not end with a slash. - Fix assert triggers in assert_cpath_layer_ok(), where we were blowing away the circuit that conn->cpath_layer points to, then checking to see if the circ is well-formed. Backport check to make sure we dont use the cpath on a closed connection. - Prevent circuit_resume_edge_reading_helper() from trying to package inbufs for marked-for-close streams. - Don't crash on hup if your options->address has become unresolvable. - Some systems (like OS X) sometimes accept() a connection and tell you the remote host is 0.0.0.0:0. If this happens, due to some other mis-features, we get confused; so refuse the conn for now. o Bugfixes on 0.0.9.x (other): - Fix harmless but scary "Unrecognized content encoding" warn message. - Add new stream error reason: TORPROTOCOL reason means "you are not speaking a version of Tor I understand; say bye-bye to your stream." - Be willing to cache directories from up to ROUTER_MAX_AGE seconds into the future, now that we are more tolerant of skew. This resolves a bug where a Tor server would refuse to cache a directory because all the directories it gets are too far in the future; yet the Tor server never logs any complaints about clock skew. - Mac packaging magic: make man pages useable, and do not overwrite existing torrc files. - Make OS X log happily to /var/log/tor/tor.log Changes in version 0.0.9.5 - 2005-02-22 o Bugfixes on 0.0.9.x: - Fix an assert race at exit nodes when resolve requests fail. - Stop picking unverified dir mirrors--it only leads to misery. - Patch from Matt Edman to make NT services work better. Service support is still not compiled into the executable by default. - Patch from Dmitri Bely so the Tor service runs better under the win32 SYSTEM account. - Make tor-resolve actually work (?) on Win32. - Fix a sign bug when getrlimit claims to have 4+ billion file descriptors available. - Stop refusing to start when bandwidthburst == bandwidthrate. - When create cells have been on the onion queue more than five seconds, just send back a destroy and take them off the list. Changes in version 0.0.9.4 - 2005-02-03 o Bugfixes on 0.0.9: - Fix an assert bug that took down most of our servers: when a server claims to have 1 GB of bandwidthburst, don't freak out. - Don't crash as badly if we have spawned the max allowed number of dnsworkers, or we're out of file descriptors. - Block more file-sharing ports in the default exit policy. - MaxConn is now automatically set to the hard limit of max file descriptors we're allowed (ulimit -n), minus a few for logs, etc. - Give a clearer message when servers need to raise their ulimit -n when they start running out of file descriptors. - SGI Compatibility patches from Jan Schaumann. - Tolerate a corrupt cached directory better. - When a dirserver hasn't approved your server, list which one. - Go into soft hibernation after 95% of the bandwidth is used, not 99%. This is especially important for daily hibernators who have a small accounting max. Hopefully it will result in fewer cut connections when the hard hibernation starts. - Load-balance better when using servers that claim more than 800kB/s of capacity. - Make NT services work (experimental, only used if compiled in). Changes in version 0.0.9.3 - 2005-01-21 o Bugfixes on 0.0.9: - Backport the cpu use fixes from main branch, so busy servers won't need as much processor time. - Work better when we go offline and then come back, or when we run Tor at boot before the network is up. We do this by optimistically trying to fetch a new directory whenever an application request comes in and we think we're offline -- the human is hopefully a good measure of when the network is back. - Backport some minimal hidserv bugfixes: keep rend circuits open as long as you keep using them; actually publish hidserv descriptors shortly after they change, rather than waiting 20-40 minutes. - Enable Mac startup script by default. - Fix duplicate dns_cancel_pending_resolve reported by Giorgos Pallas. - When you update AllowUnverifiedNodes or FirewallPorts via the controller's setconf feature, we were always appending, never resetting. - When you update HiddenServiceDir via setconf, it was screwing up the order of reading the lines, making it fail. - Do not rewrite a cached directory back to the cache; otherwise we will think it is recent and not fetch a newer one on startup. - Workaround for webservers that lie about Content-Encoding: Tor now tries to autodetect compressed directories and compression itself. This lets us Proxypass dir fetches through apache. Changes in version 0.0.9.2 - 2005-01-04 o Bugfixes on 0.0.9 (crashes and asserts): - Fix an assert on startup when the disk is full and you're logging to a file. - If you do socks4 with an IP of 0.0.0.x but *don't* provide a socks4a style address, then we'd crash. - Fix an assert trigger when the running-routers string we get from a dirserver is broken. - Make worker threads start and run on win32. Now win32 servers may work better. - Bandaid (not actually fix, but now it doesn't crash) an assert where the dns worker dies mysteriously and the main Tor process doesn't remember anything about the address it was resolving. o Bugfixes on 0.0.9 (Win32): - Workaround for brain-damaged __FILE__ handling on MSVC: keep Nick's name out of the warning/assert messages. - Fix a superficial "unhandled error on read" bug on win32. - The win32 installer no longer requires a click-through for our license, since our Free Software license grants rights but does not take any away. - Win32: When connecting to a dirserver fails, try another one immediately. (This was already working for non-win32 Tors.) - Stop trying to parse $HOME on win32 when hunting for default DataDirectory. - Make tor-resolve.c work on win32 by calling network_init(). o Bugfixes on 0.0.9 (other): - Make 0.0.9.x build on Solaris again. - Due to a fencepost error, we were blowing away the \n when reporting confvalue items in the controller. So asking for multiple config values at once couldn't work. - When listing circuits that are pending on an opening OR connection, if we're an OR we were listing circuits that *end* at us as being pending on every listener, dns/cpu worker, etc. Stop that. - Dirservers were failing to create 'running-routers' or 'directory' strings if we had more than some threshold of routers. Fix them so they can handle any number of routers. - Fix a superficial "Duplicate mark for close" bug. - Stop checking for clock skew for OR connections, even for servers. - Fix a fencepost error that was chopping off the last letter of any nickname that is the maximum allowed nickname length. - Update URLs in log messages so they point to the new website. - Fix a potential problem in mangling server private keys while writing to disk (not triggered yet, as far as we know). - Include the licenses for other free software we include in Tor, now that we're shipping binary distributions more regularly. Changes in version 0.0.9.1 - 2004-12-15 o Bugfixes on 0.0.9: - Make hibernation actually work. - Make HashedControlPassword config option work. - When we're reporting event circuit status to a controller, don't use the stream status code. Changes in version 0.0.9 - 2004-12-12 o Bugfixes on 0.0.8.1 (Crashes and asserts): - Catch and ignore SIGXFSZ signals when log files exceed 2GB; our write() call will fail and we handle it there. - When we run out of disk space, or other log writing error, don't crash. Just stop logging to that log and continue. - Fix isspace() and friends so they still make Solaris happy but also so they don't trigger asserts on win32. - Fix assert failure on malformed socks4a requests. - Fix an assert bug where a hidden service provider would fail if the first hop of his rendezvous circuit was down. - Better handling of size_t vs int, so we're more robust on 64 bit platforms. o Bugfixes on 0.0.8.1 (Win32): - Make windows sockets actually non-blocking (oops), and handle win32 socket errors better. - Fix parse_iso_time on platforms without strptime (eg win32). - win32: when being multithreaded, leave parent fdarray open. - Better handling of winsock includes on non-MSV win32 compilers. - Change our file IO stuff (especially wrt OpenSSL) so win32 is happier. - Make unit tests work on win32. o Bugfixes on 0.0.8.1 (Path selection and streams): - Calculate timeout for waiting for a connected cell from the time we sent the begin cell, not from the time the stream started. If it took a long time to establish the circuit, we would time out right after sending the begin cell. - Fix router_compare_addr_to_addr_policy: it was not treating a port of * as always matching, so we were picking reject *:* nodes as exit nodes too. Oops. - When read() failed on a stream, we would close it without sending back an end. So 'connection refused' would simply be ignored and the user would get no response. - Stop a sigpipe: when an 'end' cell races with eof from the app, we shouldn't hold-open-until-flush if the eof arrived first. - Let resolve conns retry/expire also, rather than sticking around forever. - Fix more dns related bugs: send back resolve_failed and end cells more reliably when the resolve fails, rather than closing the circuit and then trying to send the cell. Also attach dummy resolve connections to a circuit *before* calling dns_resolve(), to fix a bug where cached answers would never be sent in RESOLVED cells. o Bugfixes on 0.0.8.1 (Circuits): - Finally fix a bug that's been plaguing us for a year: With high load, circuit package window was reaching 0. Whenever we got a circuit-level sendme, we were reading a lot on each socket, but only writing out a bit. So we would eventually reach eof. This would be noticed and acted on even when there were still bytes sitting in the inbuf. - Use identity comparison, not nickname comparison, to choose which half of circuit-ID-space each side gets to use. This is needed because sometimes we think of a router as a nickname, and sometimes as a hex ID, and we can't predict what the other side will do. o Bugfixes on 0.0.8.1 (Other): - Fix a whole slew of memory leaks. - Disallow NDEBUG. We don't ever want anybody to turn off debug. - If we are using select, make sure we stay within FD_SETSIZE. - When poll() is interrupted, we shouldn't believe the revents values. - Add a FAST_SMARTLIST define to optionally inline smartlist_get and smartlist_len, which are two major profiling offenders. - If do_hup fails, actually notice. - Flush the log file descriptor after we print "Tor opening log file", so we don't see those messages days later. - Hidden service operators now correctly handle version 1 style INTRODUCE1 cells (nobody generates them still, so not a critical bug). - Handle more errnos from accept() without closing the listener. Some OpenBSD machines were closing their listeners because they ran out of file descriptors. - Some people had wrapped their tor client/server in a script that would restart it whenever it died. This did not play well with our "shut down if your version is obsolete" code. Now people don't fetch a new directory if their local cached version is recent enough. - Make our autogen.sh work on ksh as well as bash. - Better torrc example lines for dirbindaddress and orbindaddress. - Improved bounds checking on parsed ints (e.g. config options and the ones we find in directories.) - Stop using separate defaults for no-config-file and empty-config-file. Now you have to explicitly turn off SocksPort, if you don't want it open. - We were starting to daemonize before we opened our logs, so if there were any problems opening logs, we would complain to stderr, which wouldn't work, and then mysteriously exit. - If a verified OR connects to us before he's uploaded his descriptor, or we verify him and hup but he still has the original TLS connection, then conn->nickname is still set like he's unverified. o Code security improvements, inspired by Ilja: - tor_snprintf wrapper over snprintf with consistent (though not C99) overflow behavior. - Replace sprintf with tor_snprintf. (I think they were all safe, but hey.) - Replace strcpy/strncpy with strlcpy in more places. - Avoid strcat; use tor_snprintf or strlcat instead. o Features (circuits and streams): - New circuit building strategy: keep a list of ports that we've used in the past 6 hours, and always try to have 2 circuits open or on the way that will handle each such port. Seed us with port 80 so web users won't complain that Tor is "slow to start up". - Make kill -USR1 dump more useful stats about circuits. - When warning about retrying or giving up, print the address, so the user knows which one it's talking about. - If you haven't used a clean circuit in an hour, throw it away, just to be on the safe side. (This means after 6 hours a totally unused Tor client will have no circuits open.) - Support "foo.nickname.exit" addresses, to let Alice request the address "foo" as viewed by exit node "nickname". Based on a patch from Geoff Goodell. - If your requested entry or exit node has advertised bandwidth 0, pick it anyway. - Be more greedy about filling up relay cells -- we try reading again once we've processed the stuff we read, in case enough has arrived to fill the last cell completely. - Refuse application socks connections to port 0. - Use only 0.0.9pre1 and later servers for resolve cells. o Features (bandwidth): - Hibernation: New config option "AccountingMax" lets you set how many bytes per month (in each direction) you want to allow your server to consume. Rather than spreading those bytes out evenly over the month, we instead hibernate for some of the month and pop up at a deterministic time, work until the bytes are consumed, then hibernate again. Config option "MonthlyAccountingStart" lets you specify which day of the month your billing cycle starts on. - Implement weekly/monthly/daily accounting: now you specify your hibernation properties by AccountingMax N bytes|KB|MB|GB|TB AccountingStart day|week|month [day] HH:MM Defaults to "month 1 0:00". - Let bandwidth and interval config options be specified as 5 bytes, kb, kilobytes, etc; and as seconds, minutes, hours, days, weeks. o Features (directories): - New "router-status" line in directory, to better bind each verified nickname to its identity key. - Clients can ask dirservers for /dir.z to get a compressed version of the directory. Only works for servers running 0.0.9, of course. - Make clients cache directories and use them to seed their router lists at startup. This means clients have a datadir again. - Respond to content-encoding headers by trying to uncompress as appropriate. - Clients and servers now fetch running-routers; cache running-routers; compress running-routers; serve compressed running-routers.z - Make moria2 advertise a dirport of 80, so people behind firewalls will be able to get a directory. - Http proxy support - Dirservers translate requests for http://%s:%d/x to /x - You can specify "HttpProxy %s[:%d]" and all dir fetches will be routed through this host. - Clients ask for /tor/x rather than /x for new enough dirservers. This way we can one day coexist peacefully with apache. - Clients specify a "Host: %s%d" http header, to be compatible with more proxies, and so running squid on an exit node can work. - Protect dirservers from overzealous descriptor uploading -- wait 10 seconds after directory gets dirty, before regenerating. o Features (packages and install): - Add NSI installer contributed by J Doe. - Apply NT service patch from Osamu Fujino. Still needs more work. - Commit VC6 and VC7 workspace/project files. - Commit a tor.spec for making RPM files, with help from jbash. - Add contrib/torctl.in contributed by Glenn Fink. - Make expand_filename handle ~ and ~username. - Use autoconf to enable largefile support where necessary. Use ftello where available, since ftell can fail at 2GB. - Ship src/win32/ in the tarball, so people can use it to build. - Make old win32 fall back to CWD if SHGetSpecialFolderLocation is broken. o Features (ui controller): - Control interface: a separate program can now talk to your client/server over a socket, and get/set config options, receive notifications of circuits and streams starting/finishing/dying, bandwidth used, etc. The next step is to get some GUIs working. Let us know if you want to help out. See doc/control-spec.txt . - Ship a contrib/tor-control.py as an example script to interact with the control port. - "tor --hash-password zzyxz" will output a salted password for use in authenticating to the control interface. - Implement the control-spec's SAVECONF command, to write your configuration to torrc. - Get cookie authentication for the controller closer to working. - When set_conf changes our server descriptor, upload a new copy. But don't upload it too often if there are frequent changes. o Features (config and command-line): - Deprecate unofficial config option abbreviations, and abbreviations not on the command line. - Configuration infrastructure support for warning on obsolete options. - Give a slightly more useful output for "tor -h". - Break DirFetchPostPeriod into: - DirFetchPeriod for fetching full directory, - StatusFetchPeriod for fetching running-routers, - DirPostPeriod for posting server descriptor, - RendPostPeriod for posting hidden service descriptors. - New log format in config: "Log minsev[-maxsev] stdout|stderr|syslog" or "Log minsev[-maxsev] file /var/foo" - DirPolicy config option, to let people reject incoming addresses from their dirserver. - "tor --list-fingerprint" will list your identity key fingerprint and then exit. - Make tor --version --version dump the cvs Id of every file. - New 'MyFamily nick1,...' config option for a server to specify other servers that shouldn't be used in the same circuit with it. Only believed if nick1 also specifies us. - New 'NodeFamily nick1,nick2,...' config option for a client to specify nodes that it doesn't want to use in the same circuit. - New 'Redirectexit pattern address:port' config option for a server to redirect exit connections, e.g. to a local squid. - Add "pass" target for RedirectExit, to make it easier to break out of a sequence of RedirectExit rules. - Make the dirservers file obsolete. - Include a dir-signing-key token in directories to tell the parsing entity which key is being used to sign. - Remove the built-in bulky default dirservers string. - New config option "Dirserver %s:%d [fingerprint]", which can be repeated as many times as needed. If no dirservers specified, default to moria1,moria2,tor26. - Make 'Routerfile' config option obsolete. - Discourage people from setting their dirfetchpostperiod more often than once per minute. o Features (other): - kill -USR2 now moves all logs to loglevel debug (kill -HUP to get back to normal.) - Accept *:706 (silc) in default exit policy. - Implement new versioning format for post 0.1. - Distinguish between TOR_TLS_CLOSE and TOR_TLS_ERROR, so we can log more informatively. - Check clock skew for verified servers, but allow unverified servers and clients to have any clock skew. - Make sure the hidden service descriptors are at a random offset from each other, to hinder linkability. - Clients now generate a TLS cert too, in preparation for having them act more like real nodes. - Add a pure-C tor-resolve implementation. - Use getrlimit and friends to ensure we can reach MaxConn (currently 1024) file descriptors. - Raise the max dns workers from 50 to 100. Changes in version 0.0.8.1 - 2004-10-13 o Bugfixes: - Fix a seg fault that can be triggered remotely for Tor clients/servers with an open dirport. - Fix a rare assert trigger, where routerinfos for entries in our cpath would expire while we're building the path. - Fix a bug in OutboundBindAddress so it (hopefully) works. - Fix a rare seg fault for people running hidden services on intermittent connections. - Fix a bug in parsing opt keywords with objects. - Fix a stale pointer assert bug when a stream detaches and reattaches. - Fix a string format vulnerability (probably not exploitable) in reporting stats locally. - Fix an assert trigger: sometimes launching circuits can fail immediately, e.g. because too many circuits have failed recently. - Fix a compile warning on 64 bit platforms. Changes in version 0.0.8 - 2004-08-25 o Bugfixes: - Made our unit tests compile again on OpenBSD 3.5, and tor itself compile again on OpenBSD on a sparc64. - We were neglecting milliseconds when logging on win32, so everything appeared to happen at the beginning of each second. - Check directory signature _before_ you decide whether you're you're running an obsolete version and should exit. - Check directory signature _before_ you parse the running-routers list to decide who's running. - Check return value of fclose while writing to disk, so we don't end up with broken files when servers run out of disk space. - Port it to SunOS 5.9 / Athena - Fix two bugs in saving onion keys to disk when rotating, so hopefully we'll get fewer people using old onion keys. - Remove our mostly unused -- and broken -- hex_encode() function. Use base16_encode() instead. (Thanks to Timo Lindfors for pointing out this bug.) - Only pick and establish intro points after we've gotten a directory. - Fix assert triggers: if the other side returns an address 0.0.0.0, don't put it into the client dns cache. - If a begin failed due to exit policy, but we believe the IP address should have been allowed, switch that router to exitpolicy reject *:* until we get our next directory. o Protocol changes: - 'Extend' relay cell payloads now include the digest of the intended next hop's identity key. Now we can verify that we're extending to the right router, and also extend to routers we hadn't heard of before. o Features: - Tor nodes can now act as relays (with an advertised ORPort) without being manually verified by the dirserver operators. - Uploaded descriptors of unverified routers are now accepted by the dirservers, and included in the directory. - Verified routers are listed by nickname in the running-routers list; unverified routers are listed as "$". - We now use hash-of-identity-key in most places rather than nickname or addr:port, for improved security/flexibility. - AllowUnverifiedNodes config option to let circuits choose no-name routers in entry,middle,exit,introduction,rendezvous positions. Allow middle and rendezvous positions by default. - When picking unverified routers, skip those with low uptime and/or low bandwidth, depending on what properties you care about. - ClientOnly option for nodes that never want to become servers. - Directory caching. - "AuthoritativeDir 1" option for the official dirservers. - Now other nodes (clients and servers) will cache the latest directory they've pulled down. - They can enable their DirPort to serve it to others. - Clients will pull down a directory from any node with an open DirPort, and check the signature/timestamp correctly. - Authoritative dirservers now fetch directories from other authdirservers, to stay better synced. - Running-routers list tells who's down also, along with noting if they're verified (listed by nickname) or unverified (listed by hash-of-key). - Allow dirservers to serve running-router list separately. This isn't used yet. - You can now fetch $DIRURL/running-routers to get just the running-routers line, not the whole descriptor list. (But clients don't use this yet.) - Clients choose nodes proportional to advertised bandwidth. - Clients avoid using nodes with low uptime as introduction points. - Handle servers with dynamic IP addresses: don't just replace options->Address with the resolved one at startup, and detect our address right before we make a routerinfo each time. - 'FascistFirewall' option to pick dirservers and ORs on specific ports; plus 'FirewallPorts' config option to tell FascistFirewall which ports are open. (Defaults to 80,443) - Try other dirservers immediately if the one you try is down. This should tolerate down dirservers better now. - ORs connect-on-demand to other ORs - If you get an extend cell to an OR you're not connected to, connect, handshake, and forward the create cell. - The authoritative dirservers stay connected to everybody, and everybody stays connected to 0.0.7 servers, but otherwise clients/servers expire unused connections after 5 minutes. - When servers get a sigint, they delay 30 seconds (refusing new connections) then exit. A second sigint causes immediate exit. - File and name management: - Look for .torrc if no CONFDIR "torrc" is found. - If no datadir is defined, then choose, make, and secure ~/.tor as datadir. - If torrc not found, exitpolicy reject *:*. - Expands ~/ in filenames to $HOME/ (but doesn't yet expand ~arma). - If no nickname is defined, derive default from hostname. - Rename secret key files, e.g. identity.key -> secret_id_key, to discourage people from mailing their identity key to tor-ops. - Refuse to build a circuit before the directory has arrived -- it won't work anyway, since you won't know the right onion keys to use. - Parse tor version numbers so we can do an is-newer-than check rather than an is-in-the-list check. - New socks command 'resolve', to let us shim gethostbyname() locally. - A 'tor_resolve' script to access the socks resolve functionality. - A new socks-extensions.txt doc file to describe our interpretation and extensions to the socks protocols. - Add a ContactInfo option, which gets published in descriptor. - Write tor version at the top of each log file - New docs in the tarball: - tor-doc.html. - Document that you should proxy your SSL traffic too. - Log a warning if the user uses an unsafe socks variant, so people are more likely to learn about privoxy or socat. - Log a warning if you're running an unverified server, to let you know you might want to get it verified. - Change the default exit policy to reject the default edonkey, kazaa, gnutella ports. - Add replace_file() to util.[ch] to handle win32's rename(). - Publish OR uptime in descriptor (and thus in directory) too. - Remember used bandwidth (both in and out), and publish 15-minute snapshots for the past day into our descriptor. - Be more aggressive about trying to make circuits when the network has changed (e.g. when you unsuspend your laptop). - Check for time skew on http headers; report date in response to "GET /". - If the entrynode config line has only one node, don't pick it as an exitnode. - Add strict{entry|exit}nodes config options. If set to 1, then we refuse to build circuits that don't include the specified entry or exit nodes. - OutboundBindAddress config option, to bind to a specific IP address for outgoing connect()s. - End truncated log entries (e.g. directories) with "[truncated]". Changes in version 0.0.7.3 - 2004-08-12 o Stop dnsworkers from triggering an assert failure when you ask them to resolve the host "". Changes in version 0.0.7.2 - 2004-07-07 o A better fix for the 0.0.0.0 problem, that will hopefully eliminate the remaining related assertion failures. Changes in version 0.0.7.1 - 2004-07-04 o When an address resolves to 0.0.0.0, treat it as a failed resolve, since internally we use 0.0.0.0 to signify "not yet resolved". Changes in version 0.0.7 - 2004-06-07 o Fixes for crashes and other obnoxious bugs: - Fix an epipe bug: sometimes when directory connections failed to connect, we would give them a chance to flush before closing them. - When we detached from a circuit because of resolvefailed, we would immediately try the same circuit twice more, and then give up on the resolve thinking we'd tried three different exit nodes. - Limit the number of intro circuits we'll attempt to build for a hidden service per 15-minute period. - Check recommended-software string *early*, before actually parsing the directory. Thus we can detect an obsolete version and exit, even if the new directory format doesn't parse. o Fixes for security bugs: - Remember which nodes are dirservers when you startup, and if a random OR enables his dirport, don't automatically assume he's a trusted dirserver. o Other bugfixes: - Directory connections were asking the wrong poll socket to start writing, and not asking themselves to start writing. - When we detached from a circuit because we sent a begin but didn't get a connected, we would use it again the first time; but after that we would correctly switch to a different one. - Stop warning when the first onion decrypt attempt fails; they will sometimes legitimately fail now that we rotate keys. - Override unaligned-access-ok check when $host_cpu is ia64 or arm. Apparently they allow it but the kernel whines. - Dirservers try to reconnect periodically too, in case connections have failed. - Fix some memory leaks in directory servers. - Allow backslash in Win32 filenames. - Made Tor build complain-free on FreeBSD, hopefully without breaking other BSD builds. We'll see. - Check directory signatures based on name of signer, not on whom we got the directory from. This will let us cache directories more easily. - Rotate dnsworkers and cpuworkers on SIGHUP, so they get new config settings too. o Features: - Doxygen markup on all functions and global variables. - Make directory functions update routerlist, not replace it. So now directory disagreements are not so critical a problem. - Remove the upper limit on number of descriptors in a dirserver's directory (not that we were anywhere close). - Allow multiple logfiles at different severity ranges. - Allow *BindAddress to specify ":port" rather than setting *Port separately. Allow multiple instances of each BindAddress config option, so you can bind to multiple interfaces if you want. - Allow multiple exit policy lines, which are processed in order. Now we don't need that huge line with all the commas in it. - Enable accept/reject policies on SOCKS connections, so you can bind to 0.0.0.0 but still control who can use your OP. - Updated the man page to reflect these features. Changes in version 0.0.6.2 - 2004-05-16 o Our integrity-checking digest was checking only the most recent cell, not the previous cells like we'd thought. Thanks to Stefan Mark for finding the flaw! Changes in version 0.0.6.1 - 2004-05-06 o Fix two bugs in our AES counter-mode implementation (this affected onion-level stream encryption, but not TLS-level). It turns out we were doing something much more akin to a 16-character polyalphabetic cipher. Oops. Thanks to Stefan Mark for finding the flaw! o Retire moria3 as a directory server, and add tor26 as a directory server. Changes in version 0.0.6 - 2004-05-02 o Features: - Hidden services and rendezvous points are implemented. Go to http://6sxoyfb3h2nvok2d.onion/ for an index of currently available hidden services. (This only works via a socks4a proxy such as Privoxy, and currently it's quite slow.) - We now rotate link (tls context) keys and onion keys. - CREATE cells now include oaep padding, so you can tell if you decrypted them correctly. - Retry stream correctly when we fail to connect because of exit-policy-reject (should try another) or can't-resolve-address. - When we hup a dirserver and we've *removed* a server from the approved-routers list, now we remove that server from the in-memory directories too. - Add bandwidthburst to server descriptor. - Directories now say which dirserver signed them. - Use a tor_assert macro that logs failed assertions too. - Since we don't support truncateds much, don't bother sending them; just close the circ. - Fetch randomness from /dev/urandom better (not via fopen/fread) - Better debugging for tls errors - Set Content-Type on the directory and hidserv descriptor. - Remove IVs from cipher code, since AES-ctr has none. o Bugfixes: - Fix an assert trigger for exit nodes that's been plaguing us since the days of 0.0.2prexx (thanks weasel!) - Fix a bug where we were closing tls connections intermittently. It turns out openssl keeps its errors around -- so if an error happens, and you don't ask about it, and then another openssl operation happens and succeeds, and you ask if there was an error, it tells you about the first error. - Fix a bug that's been lurking since 27 may 03 (!) When passing back a destroy cell, we would use the wrong circ id. - Don't crash if a conn that sent a begin has suddenly lost its circuit. - Some versions of openssl have an SSL_pending function that erroneously returns bytes when there is a non-application record pending. - Win32 fixes. Tor now compiles on win32 with no warnings/errors. o We were using an array of length zero in a few places. o Win32's gethostbyname can't resolve an IP to an IP. o Win32's close can't close a socket. o Handle windows socket errors correctly. o Portability: - check for so we build on FreeBSD again, and for NetBSD. Changes in version 0.0.5 - 2004-03-30 o Install torrc as torrc.sample -- we no longer clobber your torrc. (Woo!) o Fix mangled-state bug in directory fetching (was causing sigpipes). o Only build circuits after we've fetched the directory: clients were using only the directory servers before they'd fetched a directory. This also means longer startup time; so it goes. o Fix an assert trigger where an OP would fail to handshake, and we'd expect it to have a nickname. o Work around a tsocks bug: do a socks reject when AP connection dies early, else tsocks goes into an infinite loop. o Hold socks connection open until reply is flushed (if possible) o Make exit nodes resolve IPs to IPs immediately, rather than asking the dns farm to do it. o Fix c99 aliasing warnings in rephist.c o Don't include server descriptors that are older than 24 hours in the directory. o Give socks 'reject' replies their whole 15s to attempt to flush, rather than seeing the 60s timeout and assuming the flush had failed. o Clean automake droppings from the cvs repository o Add in a 'notice' log level for things the operator should hear but that aren't warnings Changes in version 0.0.4 - 2004-03-26 o When connecting to a dirserver or OR and the network is down, we would crash. Changes in version 0.0.3 - 2004-03-26 o Warn and fail if server chose a nickname with illegal characters o Port to Solaris and Sparc: - include missing header fcntl.h - have autoconf find -lsocket -lnsl automatically - deal with hardware word alignment - make uname() work (solaris has a different return convention) - switch from using signal() to sigaction() o Preliminary work on reputation system: - Keep statistics on success/fail of connect attempts; they're published by kill -USR1 currently. - Add a RunTesting option to try to learn link state by creating test circuits, even when SocksPort is off. - Remove unused open circuits when there are too many. Changes in version 0.0.2 - 2004-03-19 - Include strlcpy and strlcat for safer string ops - define INADDR_NONE so we compile (but still not run) on solaris Changes in version 0.0.2pre27 - 2004-03-14 o Bugfixes: - Allow internal tor networks (we were rejecting internal IPs, now we allow them if they're set explicitly). - And fix a few endian issues. Changes in version 0.0.2pre26 - 2004-03-14 o New features: - If a stream times out after 15s without a connected cell, don't try that circuit again: try a new one. - Retry streams at most 4 times. Then give up. - When a dirserver gets a descriptor from an unknown router, it logs its fingerprint (so the dirserver operator can choose to accept it even without mail from the server operator). - Inform unapproved servers when we reject their descriptors. - Make tor build on Windows again. It works as a client, who knows about as a server. - Clearer instructions in the torrc for how to set up a server. - Be more efficient about reading fd's when our global token bucket (used for rate limiting) becomes empty. o Bugfixes: - Stop asserting that computers always go forward in time. It's simply not true. - When we sent a cell (e.g. destroy) and then marked an OR connection expired, we might close it before finishing a flush if the other side isn't reading right then. - Don't allow dirservers to start if they haven't defined RecommendedVersions - We were caching transient dns failures. Oops. - Prevent servers from publishing an internal IP as their address. - Address a strcat vulnerability in circuit.c Changes in version 0.0.2pre25 - 2004-03-04 o New features: - Put the OR's IP in its router descriptor, not its fqdn. That way we'll stop being stalled by gethostbyname for nodes with flaky dns, e.g. poblano. o Bugfixes: - If the user typed in an address that didn't resolve, the server crashed. Changes in version 0.0.2pre24 - 2004-03-03 o Bugfixes: - Fix an assertion failure in dns.c, where we were trying to dequeue a pending dns resolve even if it wasn't pending - Fix a spurious socks5 warning about still trying to write after the connection is finished. - Hold certain marked_for_close connections open until they're finished flushing, rather than losing bytes by closing them too early. - Correctly report the reason for ending a stream - Remove some duplicate calls to connection_mark_for_close - Put switch_id and start_daemon earlier in the boot sequence, so it will actually try to chdir() to options.DataDirectory - Make 'make test' exit(1) if a test fails; fix some unit tests - Make tor fail when you use a config option it doesn't know about, rather than warn and continue. - Make --version work - Bugfixes on the rpm spec file and tor.sh, so it's more up to date Changes in version 0.0.2pre23 - 2004-02-29 o New features: - Print a statement when the first circ is finished, so the user knows it's working. - If a relay cell is unrecognized at the end of the circuit, send back a destroy. (So attacks to mutate cells are more clearly thwarted.) - New config option 'excludenodes' to avoid certain nodes for circuits. - When it daemonizes, it chdir's to the DataDirectory rather than "/", so you can collect coredumps there. o Bugfixes: - Fix a bug in tls flushing where sometimes data got wedged and didn't flush until more data got sent. Hopefully this bug was a big factor in the random delays we were seeing. - Make 'connected' cells include the resolved IP, so the client dns cache actually gets populated. - Disallow changing from ORPort=0 to ORPort>0 on hup. - When we time-out on a stream and detach from the circuit, send an end cell down it first. - Only warn about an unknown router (in exitnodes, entrynodes, excludenodes) after we've fetched a directory. Changes in version 0.0.2pre22 - 2004-02-26 o New features: - Servers publish less revealing uname information in descriptors. - More memory tracking and assertions, to crash more usefully when errors happen. - If the default torrc isn't there, just use some default defaults. Plus provide an internal dirservers file if they don't have one. - When the user tries to use Tor as an http proxy, give them an http 501 failure explaining that we're a socks proxy. - Dump a new router.desc on hup, to help confused people who change their exit policies and then wonder why router.desc doesn't reflect it. - Clean up the generic tor.sh init script that we ship with. o Bugfixes: - If the exit stream is pending on the resolve, and a destroy arrives, then the stream wasn't getting removed from the pending list. I think this was the one causing recent server crashes. - Use a more robust poll on OSX 10.3, since their poll is flaky. - When it couldn't resolve any dirservers, it was useless from then on. Now it reloads the RouterFile (or default dirservers) if it has no dirservers. - Move the 'tor' binary back to /usr/local/bin/ -- it turns out many users don't even *have* a /usr/local/sbin/. Changes in version 0.0.2pre21 - 2004-02-18 o New features: - There's a ChangeLog file that actually reflects the changelog. - There's a 'torify' wrapper script, with an accompanying tor-tsocks.conf, that simplifies the process of using tsocks for tor. It even has a man page. - The tor binary gets installed to sbin rather than bin now. - Retry streams where the connected cell hasn't arrived in 15 seconds - Clean up exit policy handling -- get the default out of the torrc, so we can update it without forcing each server operator to fix his/her torrc. - Allow imaps and pop3s in default exit policy o Bugfixes: - Prevent picking middleman nodes as the last node in the circuit Changes in version 0.0.2pre20 - 2004-01-30 o New features: - We now have a deb package, and it's in debian unstable. Go to it, apt-getters. :) - I've split the TotalBandwidth option into BandwidthRate (how many bytes per second you want to allow, long-term) and BandwidthBurst (how many bytes you will allow at once before the cap kicks in). This better token bucket approach lets you, say, set BandwidthRate to 10KB/s and BandwidthBurst to 10MB, allowing good performance while not exceeding your monthly bandwidth quota. - Push out a tls record's worth of data once you've got it, rather than waiting until you've read everything waiting to be read. This may improve performance by pipelining better. We'll see. - Add an AP_CONN_STATE_CONNECTING state, to allow streams to detach from failed circuits (if they haven't been connected yet) and attach to new ones. - Expire old streams that haven't managed to connect. Some day we'll have them reattach to new circuits instead. o Bugfixes: - Fix several memory leaks that were causing servers to become bloated after a while. - Fix a few very rare assert triggers. A few more remain. - Setuid to User _before_ complaining about running as root. Changes in version 0.0.2pre19 - 2004-01-07 o Bugfixes: - Fix deadlock condition in dns farm. We were telling a child to die by closing the parent's file descriptor to him. But newer children were inheriting the open file descriptor from the parent, and since they weren't closing it, the socket never closed, so the child never read eof, so he never knew to exit. Similarly, dns workers were holding open other sockets, leading to all sorts of chaos. - New cleaner daemon() code for forking and backgrounding. - If you log to a file, it now prints an entry at the top of the logfile so you know it's working. - The onionskin challenge length was 30 bytes longer than necessary. - Started to patch up the spec so it's not quite so out of date. Changes in version 0.0.2pre18 - 2004-01-02 o Bugfixes: - Fix endian issues with the 'integrity' field in the relay header. - Fix a potential bug where connections in state AP_CONN_STATE_CIRCUIT_WAIT might unexpectedly ask to write. Changes in version 0.0.2pre17 - 2003-12-30 o Bugfixes: - Made --debuglogfile (or any second log file, actually) work. - Resolved an edge case in get_unique_circ_id_by_conn where a smart adversary could force us into an infinite loop. o Features: - Each onionskin handshake now includes a hash of the computed key, to prove the server's identity and help perfect forward secrecy. - Changed cell size from 256 to 512 bytes (working toward compatibility with MorphMix). - Changed cell length to 2 bytes, and moved it to the relay header. - Implemented end-to-end integrity checking for the payloads of relay cells. - Separated streamid from 'recognized' (otherwise circuits will get messed up when we try to have streams exit from the middle). We use the integrity-checking to confirm that a cell is addressed to this hop. - Randomize the initial circid and streamid values, so an adversary who breaks into a node can't learn how many circuits or streams have been made so far. Changes in version 0.0.2pre16 - 2003-12-14 o Bugfixes: - Fixed a bug that made HUP trigger an assert - Fixed a bug where a circuit that immediately failed wasn't being counted as a failed circuit in counting retries. o Features: - Now we close the circuit when we get a truncated cell: otherwise we're open to an anonymity attack where a bad node in the path truncates the circuit and then we open streams at him. - Add port ranges to exit policies - Add a conservative default exit policy - Warn if you're running tor as root - on HUP, retry OR connections and close/rebind listeners - options.EntryNodes: try these nodes first when picking the first node - options.ExitNodes: if your best choices happen to include any of your preferred exit nodes, you choose among just those preferred exit nodes. - options.ExcludedNodes: nodes that are never picked in path building Changes in version 0.0.2pre15 - 2003-12-03 o Robustness and bugfixes: - Sometimes clients would cache incorrect DNS resolves, which would really screw things up. - An OP that goes offline would slowly leak all its sockets and stop working. - A wide variety of bugfixes in exit node selection, exit policy handling, and processing pending streams when a new circuit is established. - Pick nodes for a path only from those the directory says are up - Choose randomly from all running dirservers, not always the first one - Increase allowed http header size for directory fetch. - Stop writing to stderr (if we're daemonized it will be closed). - Enable -g always, so cores will be more useful to me. - Switch "-lcrypto -lssl" to "-lssl -lcrypto" for broken distributions. o Documentation: - Wrote a man page. It lists commonly used options. o Configuration: - Change default loglevel to warn. - Make PidFile default to null rather than littering in your CWD. - OnionRouter config option is now obsolete. Instead it just checks ORPort>0. - Moved to a single unified torrc file for both clients and servers. Changes in version 0.0.2pre14 - 2003-11-29 o Robustness and bugfixes: - Force the admin to make the DataDirectory himself - to get ownership/permissions right - so clients no longer make a DataDirectory and then never use it - fix bug where a client who was offline for 45 minutes would never pull down a directory again - fix (or at least hide really well) the dns assert bug that was causing server crashes - warnings and improved robustness wrt clockskew for certs - use the native daemon(3) to daemonize, when available - exit if bind() fails - exit if neither socksport nor orport is defined - include our own tor_timegm (Win32 doesn't have its own) - bugfix for win32 with lots of connections - fix minor bias in PRNG - make dirserver more robust to corrupt cached directory o Documentation: - Wrote the design document (woo) o Circuit building and exit policies: - Circuits no longer try to use nodes that the directory has told them are down. - Exit policies now support bitmasks (18.0.0.0/255.0.0.0) and bitcounts (18.0.0.0/8). - Make AP connections standby for a circuit if no suitable circuit exists, rather than failing - Circuits choose exit node based on addr/port, exit policies, and which AP connections are standing by - Bump min pathlen from 2 to 3 - Relay end cells have a payload to describe why the stream ended. - If the stream failed because of exit policy, try again with a new circuit. - Clients have a dns cache to remember resolved addresses. - Notice more quickly when we have no working circuits o Configuration: - APPort is now called SocksPort - SocksBindAddress, ORBindAddress, DirBindAddress let you configure where to bind - RecommendedVersions is now a config variable rather than hardcoded (for dirservers) - Reloads config on HUP - Usage info on -h or --help - If you set User and Group config vars, it'll setu/gid to them. Changes in version 0.0.2pre13 - 2003-10-19 o General stability: - SSL_write no longer fails when it returns WANTWRITE and the number of bytes in the buf has changed by the next SSL_write call. - Fix segfault fetching directory when network is down - Fix a variety of minor memory leaks - Dirservers reload the fingerprints file on HUP, so I don't have to take down the network when I approve a new router - Default server config file has explicit Address line to specify fqdn o Buffers: - Buffers grow and shrink as needed (Cut process size from 20M to 2M) - Make listener connections not ever alloc bufs o Autoconf improvements: - don't clobber an external CFLAGS in ./configure - Make install now works - create var/lib/tor on make install - autocreate a tor.sh initscript to help distribs - autocreate the torrc and sample-server-torrc with correct paths o Log files and Daemonizing now work: - If --DebugLogFile is specified, log to it at -l debug - If --LogFile is specified, use it instead of commandline - If --RunAsDaemon is set, tor forks and backgrounds on startup