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a new TODO file with more details
svn:r155
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README
4
README
@ -32,7 +32,7 @@ Dependencies:
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For tor itself, you're going to need openssl (0.9.5 or later
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-- including the dev stuff and includes). If you're on Linux,
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everything will probably work fine. OS X and BSD (but see below under
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troubleshooting) now work too. Let us know if you get it working
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troubleshooting) may work too. Let us know if you get it working
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elsewhere.
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If you got the source from cvs:
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@ -90,7 +90,7 @@ How to use it:
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For more convenient command-line use, I recommend making a ~/.wgetrc
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with the line
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http_proxy=localhost:8118
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http_proxy=http://localhost:8118
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Then you can do things like "wget seul.org" and watch as it downloads
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from the onion routing network.
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203
TODO
203
TODO
@ -1,106 +1,107 @@
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[First four are all equally first.
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Others follow in order of priority.]
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Patch well-known proxies to make them OR compliant
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Data stream anonymizing, HTTP/FTP (Privoxy, Squid), SMTP, etc.
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Packet Redirector, a la FreeBSD (DNS, authenticated connections, etc.)
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Deploy and manage open source development site.
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Manage and maintain code, write documentation, design and write
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unit tests, handle patch submissions, make the autoconf work, etc
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Deploy a widespread network: manage deployment.
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Maintain and distribute directory/network state information etc. Keep
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operators and users happy.
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Test OR network for reliability and performance, with and without
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mechanisms for throttling, congestion control, padding, load balancing
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if applicable, etc.
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Use httperf and webload to get some performance stats
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Modify code as dictated by testing.
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Develop rendezvous points
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Implement reply onions
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Develop location protected servers idea
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Enhance router twins to do load balancing as well as DoS prevention
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Develop and deploy automated reputation management, directory servers,
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and directory/network state monitoring.
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---
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debian / red hat spec file
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handle starting things as a system daemon
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transition addr to sin_addr
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get proxy to choose the same conn if it's open
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Obvious things I'd like to do that won't break anything:
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* Abstract out crypto calls (done), with the eventual goal of moving
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from openssl to something with a more flexible license.
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* Test suite. We need one.
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* Since my OR can handle multiple circuits through a given OP,
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I think it's clear that the OP should pass new create cells through the
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same channel. Thus we can take advantage of the padding we're already
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getting. Does that mean the choose_onion functions should be changed
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to always pick a favorite OR first, so the OP can minimize the number
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of outgoing connections it must sustain?
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* Figure out what .h files we're actually using, and how portable
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those are.
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* Exit policies. Since we don't really know what protocol is being spoken,
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it really comes down to an IP range and port range that we
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allow/disallow. The 'application' connection can evaluate it and make
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a decision.
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* We currently block on gethostbyname at the exit. This is poor. We need
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to set it up so we have a separate process that we talk to. There are
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some free software versions we can use, but they'll still be tricky.
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* I'd like a cleaner interface for the configuration files, keys, etc.
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Perhaps the next step is a central repository where we download router
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lists? We can aim to make use of the directory servers that Mixminion
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deploys.
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* ORs should rotate their link keys periodically. Later.
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* The parts of the code that say 'FIXME'
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* Clean up the number of places that get to look at prkey. Later.
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* Circuits should expire sometime, say, when circuit->expire triggers?
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Later.
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Legend:
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SPEC!! - Not specified
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SPEC - Spec not finalized
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- Not done
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* Top priority
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. Partially done
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o Done
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D Deferred
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X Abandoned
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. Topics / circuits
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o Implement topics
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- Rotate circuits after N minutes?
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- Circuits should expire when circuit->expire triggers
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- Handle half-open connections
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. Clean up the event loop (optimize and sanitize)
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- Exit policies
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- Path selection algorithms
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- Let user request certain nodes
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- And disallow certain nodes
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- Choose path by jurisdiction, etc?
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- Implement our own memory management, at least for common structs
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. Appropriate logging
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- Come up with convention for what log level means what
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- Make code follow convention
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. Terminology
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o Circuits, topics, cells stay named that
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- 'Connection' gets divided, or renamed, or something?
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. DNS farm
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o Distribute queries onto the farm, get answers
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o Preemptively grow a new worker before he's needed
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- Prune workers when too many are idle
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- Keep track of which connections are in dns_wait
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- Need to cache positives/negatives on the tor side
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- Keep track of which queries have been asked
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- Better error handling when
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- An address doesn't resolve
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- We have max workers running
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. Directory servers
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- Automated reputation management
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- Include key in source; sign directories
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- Have directories list recommended-versions
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- Quit if running the wrong version
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- Command-line option to override quit
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. Add more information to directory server entries
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- Exit policies
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- jurisdiction? others?
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SPEC!! - Figure out how to do threshold directory servers
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. Scrubbing proxies
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- Find an smtp proxy?
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- Find an ftp proxy? Figure out how that would work?
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- Wait until there are packet redirectors for Linux
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. Get socks4a support into Mozilla
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. Get tor to act like a socks server
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o socks4, socks4a
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- socks5
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SPEC!! - Handle socks commands other than connect, eg, bind?
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- Develop rendezvous points
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D Implement reply onions
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D Deploy and manage open source development site.
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. Documentation
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. Discussion of socks, tsocks, etc
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- On-the-network protocol
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- Onions
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- Cells
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. Better comments for functions!
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- Tests
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- Testing harness/infrastructure
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- Unit tests
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- System tests (how?)
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- Performance tests, so we know when we've improved
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. webload infrastructure (Bruce)
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. httperf infrastructure (easy to set up)
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. oprofile (installed in RH 8.0)
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D Deploy a widespread network
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. Router twins
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o Choose twin if primary is down, when laying circuit
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- Load balancing between twins
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- Keep track of load over links/nodes, to
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know who's hosed
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- Daemonize and package
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- Teach it to fork and background
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- Red Hat spec file
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- Debian spec file equivalent
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. Autoconf
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. Which .h files are we actually using? Port to:
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o Linux
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o BSD
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. Solaris
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. Windows
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. Move away from openssl
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o Abstract out crypto calls
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- Look at ndss, others? Just include code?
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. transition addr to sin_addr (huh?)
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. Clean up the number of places that get to look at prkey
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SPEC!! - Non-clique topologies, clearer bandwidth management
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. Look at OR handshake in more detail
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- Spec it
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- Merge OR and OP handshakes?
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- Periodic link key rotation. Spec?
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Non-obvious things I'd like to do:
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(Many of these topics are inter-related. It's clear that we need more
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analysis before we can guess which approaches are good.)
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* Currently when a connection goes down, it generates a destroy cell
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(either in both directions or just the appropriate one). When a
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destroy cell arrives to an OR (and it gets read after all previous
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cells have arrived), it delivers a destroy cell for the "other side"
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of the circuit: if the other side is an OP or App, it closes the entire
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connection as well.
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But by "a connection going down", I mean "I read eof from it". Yet
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reading an eof simply means that it promises not to send any more
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data. It may still be perfectly fine receiving data (read "man 2
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shutdown"). In fact, some webservers work that way -- the client sends
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his entire request, and when the webserver reads an eof it begins
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its response. We currently don't support that sort of protocol; we
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may want to switch to some sort of a two-way-destroy-ripple technique
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(where a destroy makes its way all the way to the end of the circuit
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before being echoed back, and data stops flowing only when a destroy
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has been received from both sides of the circuit); this extends the
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one-hop-ack approach that Matej used.
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* Reply onions. Hrm.
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@ -1,6 +1,6 @@
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AC_INIT
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AM_INIT_AUTOMAKE(tor, 0.0.1)
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AM_INIT_AUTOMAKE(tor, 0.0.2pre4)
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AM_CONFIG_HEADER(orconfig.h)
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CFLAGS="-Wall -O2"
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