$Id$ Legend: SPEC!! - Not specified SPEC - Spec not finalized N - nick claims R - arma claims P - phobos claims - Not done * Top priority . Partially done o Done D Deferred X Abandoned Non-Coding, Soon: N - Mark up spec; note unclear points about servers N - Mention controller libs someplace. D FAQ entry: why gnutls is bad/not good for tor P - flesh out the rest of the section 6 of the faq P - gather pointers to livecd distros that include tor R . more pictures from ren. he wants to describe the tor handshake, i want to talk about hidden services. NR- write a spec appendix for 'being nice with tor' - tor-in-the-media page - Remove need for HACKING file. Website: - and remove home and make the "Tor" picture be the link to home. - put the logo on the website, in source form, so people can put it on stickers directly, etc. for 0.1.1.x-rc: N - building on freebsd 6.0: (with multiple openssl installations) . "Let's try to find a way to make it run and make the version match, but if not, let's just make it run." - should we detect if we have a --with-ssl-dir and try the -R by default, if it works? - support dir 503s better o clients don't log as loudly when they receive them - they don't count toward the 3-strikes rule - should there be some threshold of 503's after which we give up? - think about how to split "router is down" from "dirport shouldn't be tried for a while"? - authorities should *never* 503 a cache, but *should* 503 clients when they feel like it. - update dir-spec with what we decided for each of these o when logging unknown http headers, this could include bad escape codes? more generally, attacker-controller log entries with newlines in them are dangerous for our users. o So... add functions to escape potentially malicious values before logging them, and test values more closely as they arrive... - But what to do about contact_info and platform? - (Didn't finish converting rend*.c) - Make "setconf" and "hup" behavior cleaner for LINELIST config options (e.g. Log). Bug 238. R - Jan 26 10:25:04.832 [warn] add_an_entry_guard(): Tried finding a new entry, but failed. Bad news. XXX. R - streamline how we define a guard node as 'up'. document it somewhere. R - reduce log severity for guard nodes. R - make guard node timeout higher. o Clean and future-proof exit policy formats a bit. o Likewise accept, but don't generate /bits formats (unless they're accepted in 0.0.9 and later). o Warn when we see a netmask that isn't a prefix. o Make clients understand "private:*" in exit policies, even though we don't generate it yet. for 0.1.1.x-final: - find 10 dirservers. - Make it no longer default for v2 dirservers to support v1. - non-versioning dirservers don't need to set recommended*versions. - non-naming dirservers don't need to have an approved-routers file. - What are criteria to be a dirserver? Write a policy. - Document AuthDirInvalid, AuthDirReject, AuthDirRejectUnlisted - are there other options that we haven't documented so far? - look at the proposed os x uninstaller: http://archives.seul.org/or/talk/Jan-2006/msg00038.html Deferred from 0.1.1.x: N - commit edmanm's win32 makefile to tor cvs contrib R - look into "uncounting" bytes spent on local connections. so we can bandwidthrate but still have fast downloads. R - Christian Grothoff's attack of infinite-length circuit. the solution is to have a separate 'extend-data' cell type which is used for the first N data cells, and only extend-data cells can be extend requests. - Specify, including thought about - Implement R - When we connect to a Tor server, it sends back a signed cell listing the IP it believes it is using. Use this to block dvorak's attack. Also, this is a fine time to say what time you think it is. - Verify that a new cell type is okay with deployed codebase - Specify - Implement R - failed rend desc fetches sometimes don't get retried. - Add config options to not publish and not fetch rend descs. - Add controller interfaces to hear rend desc events and learn about rend descs. In base16 I guess for now. N - Display the reasons in 'destroy' and 'truncated' cells under some circumstances? - If the server is spewing complaints about raising your ulimit -n, we should add a note about this to the server descriptor so other people can notice too. - We need a getrlimit equivalent on Windows so we can reserve some file descriptors for saving files, etc. Otherwise we'll trigger asserts when we're out of file descriptors and crash. X it would be nice to support a unix socket for the control thing. The main motivation behind this was that we could let unix permissions take care of the authentication step: everybody who can connect to the socket is authenticated. However, the linux unix(7) manual page suggests that requiring read/write permissions on the socket in order to use it is Linux specific, and that many BSD-derived systems ignore the permissions on the socket file. Portable programs should not rely on this feature for security, therefore the motivation for this feature is gone. - the tor client can do the "automatic proxy config url" thing? R - clients prefer to avoid exit nodes for non-exit path positions. - Automatically determine what ports are reachable and start using those, if circuits aren't working and it's a pattern we recognize ("port 443 worked once and port 9001 keeps not working"). N - Should router info have a pointer to routerstatus? - We should at least do something about the duplicated fields. N . Additional controller features - change circuit status events to give more details, like purpose, whether they're internal, when they become dirty, when they become too dirty for further circuits, etc. R - What do we want here, exactly? N - Specify and implement it. - Change stream status events analogously. R - What do we want here, exactly? N - Specify and implement it. - Make other events "better". - Change stream status events analogously. R - What do we want here, exactly? N - Specify and implement it. - Make other events "better" analogously R - What do we want here, exactly? N - Specify and implement it. . Expose more information via getinfo: - import and export rendezvous descriptors - Review all static fields for additional candidates - Allow EXTENDCIRCUIT to unknown server. - We need some way to adjust server status, and to tell tor not to download directories/network-status, and a way to force a download. - It would be nice to request address lookups from the controller without using SOCKS. - Make everything work with hidden services X switch accountingmax to count total in+out, not either in or out. it's easy to move in this direction (not risky), but hard to back out if we decide we prefer it the way it already is. hm. - cpu fixes: - see if we should make use of truncate to retry R - kill dns workers more slowly . Directory changes . Some back-out mechanism for auto-approval - a way of rolling back approvals to before a timestamp - Consider minion-like fingerprint file/log combination. - config option to publish what ports you listen on, beyond ORPort/DirPort. It should support ranges and bit prefixes (?) too. - Parse this. - Relay this in networkstatus. - Non-directories don't need to keep descriptors in memory. o Make descriptor-fetching happen via an indirection function. - Remember file and offset. - Keep a journal FD for appending router descriptors. - packaging and ui stuff: . multiple sample torrc files - uninstallers . for os x . figure out how to make nt service stuff work? . Document it. . Add version number to directory. N - Vet all pending installer patches - Win32 installer plus privoxy, sockscap/freecap, etc. - Vet win32 systray helper code - document: - torcp needs more attention in the tor-doc-win32. - recommend gaim. - unrecommend IE because of ftp:// bug. - torrc.complete.in needs attention? - Bind to random port when making outgoing connections to Tor servers, to reduce remote sniping attacks. - Have new people be in limbo and need to demonstrate usefulness before we approve them. - Clients should estimate their skew as median of skew from servers over last N seconds. - Security - Alices avoid duplicate class C nodes. - Analyze how bad the partitioning is or isn't. . Update the hidden service stuff for the new dir approach. - switch to an ascii format, maybe sexpr? - authdirservers publish blobs of them. - other authdirservers fetch these blobs. - hidserv people have the option of not uploading their blobs. - you can insert a blob via the controller. - and there's some amount of backwards compatibility. - teach clients, intro points, and hidservs about auth mechanisms. - come up with a few more auth mechanisms. . Come up with a coherent strategy for bandwidth buckets and TLS. (The logic for reading from TLS sockets is likely to overrun the bandwidth buckets under heavy load. (Really, the logic was never right in the first place.) Also, we should audit all users of get_pending_bytes().) - Make it harder to circumvent bandwidth caps: look at number of bytes sent across sockets, not number sent inside TLS stream. - Make router_is_general_exit() a bit smarter once we're sure what it's for. - rewrite how libevent does select() on win32 so it's not so very slow. - Write limiting; separate token bucket for write - Audit everything to make sure rend and intro points are just as likely to be us as not. - Do something to prevent spurious EXTEND cells from making middleman nodes connect all over. Rate-limit failed connections, perhaps? Major items for 0.1.2.x: - Directory guards R - Server usability N - Better hidden service performance - Improve controller - Asynchronous DNS - Better estimates in the directory of whether servers have good uptime (high expected time to failure) or good guard qualities (high fractional uptime). - memory usage on dir servers. copy less! N - oprofile including kernel time. Topics to think about during 0.1.2.x development: - Figure out non-clique. - Figure out partial network knowledge. - Figure out incentives. Future version: - Limit to 2 dir, 2 OR, N SOCKS connections per IP. - Handle full buffers without totally borking - Rate-limit OR and directory connections overall and per-IP and maybe per subnet. - Hold-open-until-flushed now works by accident; it should work by design. - DoS protection: TLS puzzles, public key ops, bandwidth exhaustion. - Specify? - tor-resolve script should use socks5 to get better error messages. - make min uptime a function of the available choices (say, choose 60th percentile, not 1 day.) - Track uptime as %-of-time-up, as well as time-since-last-down. - hidserv offerers shouldn't need to define a SocksPort * figure out what breaks for this, and do it. - auth mechanisms to let hidden service midpoint and responder filter connection requests. - Relax clique assumptions. X start handling server descriptors without a socksport? - tor should be able to have a pool of outgoing IP addresses that it is able to rotate through. (maybe) Blue-sky: - Patch privoxy and socks protocol to pass strings to the browser. - Standby/hotswap/redundant hidden services. - Robust decentralized storage for hidden service descriptors. - The "China problem" - Allow small cells and large cells on the same network? - Cell buffering and resending. This will allow us to handle broken circuits as long as the endpoints don't break, plus will allow connection (tls session key) rotation. - Implement Morphmix, so we can compare its behavior, complexity, etc. - Other transport. HTTP, udp, rdp, airhook, etc. May have to do our own link crypto, unless we can bully openssl into it. - Need a relay teardown cell, separate from one-way ends. (Pending a user who needs this) - Handle half-open connections: right now we don't support all TCP streams, at least according to the protocol. But we handle all that we've seen in the wild. (Pending a user who needs this)