Legend: SPEC!! - Not specified SPEC - Spec not finalized NICK - nick claims ARMA - arma claims - Not done * Top priority . Partially done o Done D Deferred X Abandoned . streams / circuits o Implement streams o Rotate circuits after N minutes? X Circuits should expire when circuit->expire triggers NICK . Handle half-open connections o Figure out what causes connections to close, standardize when we mark a connection vs when we tear it down o Look at what ssl does to keep from mutating data streams ARMA - Reduce streamid footprint from 7 bytes to 3 bytes - Check for collisions in streamid (now possible with just 3 bytes), and back up & replace with padding if so - Use the 3 saved bytes to put pseudorandomness in each cell - Use the 4 reserved bytes in each cell header to keep 1/5 of a sha1 of the payload - (Move these 4 bytes into the stream header) - Consider moving length into the stream header too - Spec the stream_id stuff. Clarify that nobody on the backward stream should look at stream_id. ARMA . Exit policies o Spec how to write the exit policies - Path selection algorithms - Let user request certain nodes - And disallow certain nodes D Choose path by jurisdiction, etc? - Make relay end cells have failure status and payload attached - Streams that fail due to exit policy must reextend to new node - Add extend_wait state to edge connections, thumb through them when the AP get an extended cell. SPEC!! D Non-clique topologies D Implement our own memory management, at least for common structs . Appropriate logging - Come up with convention for what log level means what - Make code follow convention . Put CPU workers in separate processes o Handle multiple cpu workers (one for each cpu, plus one) o Queue for pending tasks if all workers full o Support the 'process this onion' task - Support the 'decrypt this RSA blob' handshake1 task - Handle cpuworkers dying D Support later handshake parts . Directory servers D Automated reputation management o Include key in source; sign directories o Signed directory backend o Document o Integrate - Add versions to code . Have directories list recommended-versions o Include (unused) line in directories o Check for presence of line. - Quit if running the wrong version - Command-line option to override quit . Add more information to directory server entries o Exit policies D jurisdiction? others? SPEC!! D Figure out how to do threshold directory servers . Scrubbing proxies - Find an smtp proxy? - Check the old smtp proxy code o Find an ftp proxy? wget --passive D Wait until there are packet redirectors for Linux . Get socks4a support into Mozilla . Get tor to act like a socks server o socks4, socks4a D socks5 SPEC!! - Handle socks commands other than connect, eg, bind? . Develop rendezvous points . Spec (still needs step-by-step instructions) - Implement D Deploy and manage open source development site. . Documentation o Discussion of socks, tsocks, etc o On-the-network protocol o Onions o Cells . Better comments for functions! - Tests o Testing harness/infrastructure NICK . Unit tests D System tests (how?) - Performance tests, so we know when we've improved . webload infrastructure (Bruce) . httperf infrastructure (easy to set up) . oprofile (installed in RH >8.0) D Deploy a widespread network . Router twins o Choose twin if primary is down, when laying circuit D Load balancing between twins - Keep track of load over links/nodes, to know who's hosed NICK . Daemonize and package o Teach it to fork and background - Red Hat spec file - Debian spec file equivalent . Autoconf . Which .h files are we actually using? . Port to: o Linux o BSD . Solaris o Cygwin . Win32 o OS X o openssl randomness o inet_ntoa . stdint.h - Make a script to set up a local network on your machine D Move away from openssl o Abstract out crypto calls D Look at nss, others? Just include code? . Clearer bandwidth management - Do we want to remove bandwidth from OR handshakes? - What about OP handshakes? - More flexibility in node addressing D Support IPv6 rather than just 4 - Handle multihomed servers (config variable to set IP) . Move from onions to ephemeral DH o incremental path building o transition circuit-level sendmes to hop-level sendmes o implement truncate, truncated o move from 192byte DH to 128byte DH, so it isn't so damn slow - exiting from not-last hop - OP logic to decide to extend/truncate a path - make sure exiting from the not-last hop works - logic to find last *open* hop, not last hop, in cpath - choose exit nodes by exit policies Older (done) todo stuff: o Use a stronger cipher o aes now, by including the code ourselves X On the fly compression of each stream o Clean up the event loop (optimize and sanitize) o Remove that awful concept of 'roles' o Terminology o Circuits, topics, cells stay named that o 'Connection' gets divided, or renamed, or something? o DNS farm o Distribute queries onto the farm, get answers o Preemptively grow a new worker before he's needed o Prune workers when too many are idle o DNS cache o Clear DNS cache over time D Honor DNS TTL info (how??) o Have strategy when all workers are busy o Keep track of which connections are in dns_wait o Need to cache positives/negatives on the tor side o Keep track of which queries have been asked o Better error handling when o An address doesn't resolve o We have max workers running o Consider taking the master out of the loop? D Implement reply onions o Total rate limiting o Look at OR handshake in more detail o Spec it o Merge OR and OP handshakes o rearrange connection_or so it doesn't suck so much to read D Periodic link key rotation. Spec? o wrap malloc with something that explodes when it fails o Clean up the number of places that get to look at prkey