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en/volunteer.wml 1) ## translation metadata
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en/volunteer.wml 2) # Revision: $Revision$
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en/volunteer.wml 4) #include "head.wmi" TITLE="Volunteer"
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volunteer.html 5)
volunteer.html 6) <div class="main-column">
volunteer.html 7)
volunteer.html 8) <!-- PUT CONTENT AFTER THIS TAG -->
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en/volunteer.wml 9) <h2>Three things everyone can do now:</h2>
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volunteer.html 10) <ol>
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en/volunteer.wml 11) <li>Please consider <a href="<page docs/tor-doc-server>">running
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volunteer.html 12) a server</a> to help the Tor network grow.</li>
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en/volunteer.wml 13) <li>Tell your friends! Get them to run servers. Get them to run hidden
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volunteer.html 14) services. Get them to tell their friends.</li>
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en/volunteer.wml 15) <li>We are looking for funding and sponsors. If you like Tor's goals, please
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a short paragraph of explan...
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en/volunteer.wml 16) <a href="<page donate>">take a moment to donate to support further
en/volunteer.wml 17) Tor development</a>. Also, if you know any
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en/volunteer.wml 18) companies, NGOs, agencies, or other organizations that want communications
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en/volunteer.wml 19) security, let them know about us.</li>
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volunteer.html 20) </ol>
volunteer.html 21)
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en/volunteer.wml 22) <a id="Usability"></a>
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en/volunteer.wml 23) <h2><a class="anchor" href="#Usability">Supporting Applications</a></h2>
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volunteer.html 24) <ol>
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en/volunteer.wml 25) <li>We need good ways to intercept DNS requests so they don't "leak" their
en/volunteer.wml 26) request to a local observer while we're trying to be anonymous. (This
en/volunteer.wml 27) happens because the application does the DNS resolve before going to
en/volunteer.wml 28) the SOCKS proxy.)</li>
en/volunteer.wml 29) <ul>
en/volunteer.wml 30) <li>We need to <a
en/volunteer.wml 31) href="http://wiki.noreply.org/noreply/TheOnionRouter/TSocksPatches">apply
en/volunteer.wml 32) all our tsocks patches</a> and maintain a new fork. We'll host it if
en/volunteer.wml 33) you want.</li>
en/volunteer.wml 34) <li>We should patch Dug Song's "dsocks" program to use Tor's
en/volunteer.wml 35) <i>mapaddress</i> commands from the controller interface, so we
en/volunteer.wml 36) don't waste a whole round-trip inside Tor doing the resolve before
en/volunteer.wml 37) connecting.</li>
en/volunteer.wml 38) <li>We need to make our <i>torify</i> script detect which of tsocks or
en/volunteer.wml 39) dsocks is installed, and call them appropriately. This probably means
en/volunteer.wml 40) unifying their interfaces, and might involve sharing code between them
en/volunteer.wml 41) or discarding one entirely.</li>
en/volunteer.wml 42) </ul>
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volunteer.html 43) <li>People running servers tell us they want to have one BandwidthRate
volunteer.html 44) during some part of the day, and a different BandwidthRate at other parts
volunteer.html 45) of the day. Rather than coding this inside Tor, we should have a little
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en/volunteer.wml 46) script that speaks via the <a href="<page gui/index>">Tor Controller Interface</a>,
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volunteer.html 47) and does a setconf to change the bandwidth rate. Perhaps it would run out
volunteer.html 48) of cron, or perhaps it would sleep until appropriate times and then do
volunteer.html 49) its tweak (that's probably more portable). Can somebody write one for us
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en/volunteer.wml 50) and we'll put it into <a href="<svnsandbox>contrib/">contrib/</a>?
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en/volunteer.wml 51) This is a good entry for the <a href="<page gui/index>">Tor GUI
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en/volunteer.wml 52) competition</a>.
en/volunteer.wml 53) <!-- We have a good script to adjust stuff now, right? -NM -->
en/volunteer.wml 54) </li>
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en/volunteer.wml 55) <li>Tor can <a
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volunteer.html 56) href="http://wiki.noreply.org/noreply/TheOnionRouter/TorFAQ#ChooseEntryExit">exit
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en/volunteer.wml 57) the Tor network from a particular exit node</a>, but we should be able
en/volunteer.wml 58) to specify just a country and have something automatically pick. The
en/volunteer.wml 59) best bet is to fetch Blossom's directory also, and run a local Blossom
en/volunteer.wml 60) client that fetches this directory securely (via Tor and checking its
en/volunteer.wml 61) signature), intercepts <tt>.country.blossom</tt> hostnames, and does
en/volunteer.wml 62) the right thing.</li>
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volunteer.html 63) <li>Speaking of geolocation data, somebody should draw a map of the Earth
volunteer.html 64) with a pin-point for each Tor server. Bonus points if it updates as the
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en/volunteer.wml 65) network grows and changes. Unfortunately, the easy ways to do this involve
en/volunteer.wml 66) sending all the data to Google and having them draw the map for you. How
en/volunteer.wml 67) much does this impact privacy, and do we have any other good options?</li>
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volunteer.html 68) </ol>
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en/volunteer.wml 70) <a id="Documentation"></a>
en/volunteer.wml 71) <h2><a class="anchor" href="#Documentation">Documentation</a></h2>
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volunteer.html 72) <ol>
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en/volunteer.wml 73) <li>We hear that Tor users can fall victim to anonymity-breaking attacks
en/volunteer.wml 74) from javascript, java, activex, flash, etc, if they don't disable
en/volunteer.wml 75) them. Are there plugins out there (like NoScript for Firefox) that make
en/volunteer.wml 76) it easier for users to manage this risk? What is the risk exactly?</li>
en/volunteer.wml 77) <li>Is there a full suite of plugins that will replace all of Privoxy's
en/volunteer.wml 78) functionality for Firefox 1.5+? We hear Tor is much faster when you take
en/volunteer.wml 79) Privoxy out of the loop.</li>
en/volunteer.wml 80) <li>Please help Matt Edman with the documentation and how-tos for his
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en/volunteer.wml 81) Tor controller,
en/volunteer.wml 82) <a href="http://vidalia-project.net/">Vidalia</a>.</li>
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en/volunteer.wml 83) <li>Evaluate and document
en/volunteer.wml 84) <a href="http://wiki.noreply.org/wiki/TheOnionRouter/TorifyHOWTO">our
en/volunteer.wml 85) list of programs</a> that can be configured to use Tor.</li>
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volunteer.html 86) <li>We need better documentation for dynamically intercepting
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en/volunteer.wml 87) connections and sending them through Tor. tsocks (Linux), dsocks (BSD),
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en/volunteer.wml 88) and freecap (Windows) seem to be good candidates, as would better
en/volunteer.wml 89) use of our new TransPort feature.</li>
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en/volunteer.wml 90) <li>We have a huge list of <a href="http://wiki.noreply.org/noreply/TheOnionRouter/SupportPrograms">potentially useful
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volunteer.html 91) programs that interface to Tor</a>. Which ones are useful in which
volunteer.html 92) situations? Please help us test them out and document your results.</li>
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en/volunteer.wml 93) <li>Help translate the web page and documentation into other
en/volunteer.wml 94) languages. See the <a href="<page translation>">translation
en/volunteer.wml 95) guidelines</a> if you want to help out. We also need people to help
en/volunteer.wml 96) maintain the existing Italian, French, and Swedish translations -
en/volunteer.wml 97) see the <a href="<page translation-status>">translation status
en/volunteer.wml 98) overview</a>.</li>
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en/volunteer.wml 99) <li>Can somebody walk us through whether we want to go the
en/volunteer.wml 100) <a href="http://www.cacert.org/">cacert</a> route for our
en/volunteer.wml 101) SSL <a href="<page documentation>#Developers">SVN repository?</a></li>
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volunteer.html 102) </ol>
volunteer.html 103)
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en/volunteer.wml 104) <a id="Coding"></a>
en/volunteer.wml 105) <h2><a class="anchor" href="#Coding">Coding and Design</a></h2>
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en/volunteer.wml 106) <p>Want to spend your Google Summer of Code working on Tor? Great. More
en/volunteer.wml 107) details coming soon. In the mean time, see if any of these ideas catch
en/volunteer.wml 108) your eye.</p>
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volunteer.html 109) <ol>
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en/volunteer.wml 110) <li>Tor servers don't work well on Windows XP. On
en/volunteer.wml 111) Windows, Tor uses the standard <tt>select</tt> system
en/volunteer.wml 112) call, which uses space in the non-page pool. This means
en/volunteer.wml 113) that a medium sized Tor server will empty the non-page pool, <a
en/volunteer.wml 114) href="http://wiki.noreply.org/noreply/TheOnionRouter/WindowsBufferProblems">causing
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en/volunteer.wml 115) havoc and crashes</a>. We should probably be using overlapped IO
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en/volunteer.wml 116) instead. One solution would be to teach libevent how to use overlapped IO
en/volunteer.wml 117) rather than select() on Windows, and then adapt Tor to the new libevent
en/volunteer.wml 118) interface.</li>
en/volunteer.wml 119) <li>Because Tor servers need to store-and-forward each cell they handle,
en/volunteer.wml 120) high-bandwidth Tor servers end up using dozens of megabytes of memory
en/volunteer.wml 121) just for buffers. We need better heuristics for when to shrink/expand
en/volunteer.wml 122) buffers. Maybe this should be modelled after the Linux kernel buffer
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en/volunteer.wml 123) design, where we have many smaller buffers that link to each other,
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en/volunteer.wml 124) rather than monolithic buffers?</li>
en/volunteer.wml 125) <li>We need an official central site to answer "Is this IP address a Tor
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en/volunteer.wml 126) exit server?" questions. This should provide several interfaces, including
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en/volunteer.wml 127) a web interface and a DNSBL-style interface. It can provide the most
en/volunteer.wml 128) up-to-date answers by keeping a local mirror of the Tor directory
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en/volunteer.wml 129) information. The tricky point is that being an exit server is not a
en/volunteer.wml 130) boolean: so the question is actually "Is this IP address a Tor exit
en/volunteer.wml 131) server that can exit to my IP address:port?" The DNSBL interface
en/volunteer.wml 132) will probably receive hundreds of queries a minute, so some smart
en/volunteer.wml 133) algorithms are in order. Bonus points if it does active testing through
en/volunteer.wml 134) each exit node to find out what IP address it's really exiting from.</li>
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en/volunteer.wml 135) <li>It would be great to have a LiveCD that includes the latest
en/volunteer.wml 136) versions of Tor, Polipo or Privoxy, Firefox, Gaim+OTR, etc. There are
en/volunteer.wml 137) two challenges here: first is documenting the system and choices well
en/volunteer.wml 138) enough that security people can form an opinion on whether it should be
en/volunteer.wml 139) secure, and the second is figuring out how to make it easily maintainable,
en/volunteer.wml 140) so it doesn't become quickly obsolete like AnonymOS. Bonus points if
en/volunteer.wml 141) the CD image fits on one of those small-form-factor CDs.</li>
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en/volunteer.wml 142) <li>Related to the LiveCD image, we should work on an intuitively secure
en/volunteer.wml 143) and well-documented USB image for Tor and supporting applications. A
en/volunteer.wml 144) lot of the hard part here is deciding what configurations are secure,
en/volunteer.wml 145) documentating these decisions, and making something that is easy to
en/volunteer.wml 146) maintain going forward.</li>
en/volunteer.wml 147) <li>We need to actually start building our <a href="<page
en/volunteer.wml 148) documentation>#DesignDoc">blocking-resistance design</a>. This involves
en/volunteer.wml 149) fleshing out the design, modifying many different pieces of Tor, working
en/volunteer.wml 150) on a <a href="http://vidalia-project.net/">GUI</a> that's intuitive,
en/volunteer.wml 151) and planning for deployment.</li>
en/volunteer.wml 152) <li>We need a flexible simulator framework for studying end-to-end
en/volunteer.wml 153) traffic confirmation attacks. Many researchers have whipped up ad hoc
en/volunteer.wml 154) simulators to support their intuition either that the attacks work
en/volunteer.wml 155) really well or that some defense works great. Can we build a simulator
en/volunteer.wml 156) that's clearly documented and open enough that everybody knows it's
en/volunteer.wml 157) giving a reasonable answer? This will spur a lot of new research.
en/volunteer.wml 158) See the entry <a href="#Research">below</a> on confirmation attacks for
en/volunteer.wml 159) details on the research side of this task — who knows, when it's
en/volunteer.wml 160) done maybe you can help write a paper or three also.</li>
en/volunteer.wml 161) <li>We need a measurement study of <a
en/volunteer.wml 162) href="http://www.pps.jussieu.fr/~jch/software/polipo/">Polipo</a>
en/volunteer.wml 163) vs <a href="http://www.privoxy.org/">Privoxy</a>. Is Polipo in fact
en/volunteer.wml 164) significantly faster, once you factor in the slow-down from Tor? Are the
en/volunteer.wml 165) results the same on both Linux and Windows? Related, does Polipo handle
en/volunteer.wml 166) more web sites correctly than Privoxy, or vice versa? Are there stability
en/volunteer.wml 167) issues on any common platforms, e.g. Windows?</li>
en/volunteer.wml 168) <li>Related on the above, would you like to help port <a
en/volunteer.wml 169) href="http://www.pps.jussieu.fr/~jch/software/polipo/">Polipo</a> so it
en/volunteer.wml 170) runs stably and efficiently on Windows?</li>
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en/volunteer.wml 171) <li>We need a distributed testing framework. We have unit tests,
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en/volunteer.wml 172) but it would be great to have a script that starts up a Tor network, uses
en/volunteer.wml 173) it for a while, and verifies that at least parts of it are working.</li>
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en/volunteer.wml 174) <!--
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en/volunteer.wml 175) <li>Right now the hidden service descriptors are being stored on just a
en/volunteer.wml 176) few directory servers. This is bad for privacy and bad for robustness. To
en/volunteer.wml 177) get more robustness, we're going to need to make hidden service
en/volunteer.wml 178) descriptors even less private because we're going to have to mirror them
en/volunteer.wml 179) onto many places. Ideally we'd like to separate the storage/lookup system
en/volunteer.wml 180) from the Tor directory servers entirely. The first problem is that we need
en/volunteer.wml 181) to design a new hidden service descriptor format to a) be ascii rather
en/volunteer.wml 182) than binary for convenience; b) keep the list of introduction points
en/volunteer.wml 183) encrypted unless you know the <tt>.onion</tt> address, so the directory
en/volunteer.wml 184) can't learn them; and c) allow the directories to verify the timestamp
en/volunteer.wml 185) and signature on a hidden service descriptor so they can't be tricked
en/volunteer.wml 186) into giving out fake ones. Second, any reliable distributed storage
en/volunteer.wml 187) system will do, as long as it allows authenticated updates, but as far
en/volunteer.wml 188) as we know no implemented DHT code supports authenticated updates.</li>
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en/volunteer.wml 189) -->
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en/volunteer.wml 190) <li>Tor 0.1.1.x and later include support for hardware crypto accelerators
en/volunteer.wml 191) via
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volunteer.html 192) OpenSSL. Nobody has ever tested it, though. Does somebody want to get
volunteer.html 193) a card and let us know how it goes?</li>
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volunteer.html 194) <li>Perform a security analysis of Tor with <a
volunteer.html 195) href="http://en.wikipedia.org/wiki/Fuzz_testing">"fuzz"</a>. Determine
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en/volunteer.wml 196) if there are good fuzzing libraries out there for what we want. Win fame by
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volunteer.html 197) getting credit when we put out a new release because of you!</li>
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volunteer.html 198) <li>Tor uses TCP for transport and TLS for link
volunteer.html 199) encryption. This is nice and simple, but it means all cells
volunteer.html 200) on a link are delayed when a single packet gets dropped, and
volunteer.html 201) it means we can only reasonably support TCP streams. We have a <a
volunteer.html 202) href="http://wiki.noreply.org/noreply/TheOnionRouter/TorFAQ#TransportIPnotTCP">list
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en/volunteer.wml 203) of reasons why we haven't shifted to UDP transport</a>, but it would
en/volunteer.wml 204) be great to see that list get shorter. We also have a proposed <a
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en/volunteer.wml 205) href="<svnsandbox>doc/spec/proposals/100-tor-spec-udp.txt">specification
en/volunteer.wml 206) for Tor and
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en/volunteer.wml 207) UDP</a> — please let us know what's wrong with it.</li>
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volunteer.html 208) <li>We're not that far from having IPv6 support for destination addresses
volunteer.html 209) (at exit nodes). If you care strongly about IPv6, that's probably the
volunteer.html 210) first place to start.</li>
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volunteer.html 211) </ol>
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en/volunteer.wml 213) <a id="Research"></a>
en/volunteer.wml 214) <h2><a class="anchor" href="#Research">Research</a></h2>
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volunteer.html 215) <ol>
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volunteer.html 216) <li>The "website fingerprinting attack": make a list of a few
volunteer.html 217) hundred popular websites, download their pages, and make a set of
volunteer.html 218) "signatures" for each site. Then observe a Tor client's traffic. As
volunteer.html 219) you watch him receive data, you quickly approach a guess about which
volunteer.html 220) (if any) of those sites he is visiting. First, how effective is
volunteer.html 221) this attack on the deployed Tor codebase? Then start exploring
volunteer.html 222) defenses: for example, we could change Tor's cell size from 512
volunteer.html 223) bytes to 1024 bytes, we could employ padding techniques like <a
volunteer.html 224) href="http://freehaven.net/anonbib/#timing-fc2004">defensive dropping</a>,
volunteer.html 225) or we could add traffic delays. How much of an impact do these have,
volunteer.html 226) and how much usability impact (using some suitable metric) is there from
volunteer.html 227) a successful defense in each case?</li>
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volunteer.html 228) <li>The "end-to-end traffic confirmation attack":
volunteer.html 229) by watching traffic at Alice and at Bob, we can <a
volunteer.html 230) href="http://freehaven.net/anonbib/#danezis:pet2004">compare
volunteer.html 231) traffic signatures and become convinced that we're watching the same
volunteer.html 232) stream</a>. So far Tor accepts this as a fact of life and assumes this
volunteer.html 233) attack is trivial in all cases. First of all, is that actually true? How
volunteer.html 234) much traffic of what sort of distribution is needed before the adversary
volunteer.html 235) is confident he has won? Are there scenarios (e.g. not transmitting much)
volunteer.html 236) that slow down the attack? Do some traffic padding or traffic shaping
volunteer.html 237) schemes work better than others?</li>
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volunteer.html 238) <li>The "routing zones attack": most of the literature thinks of
volunteer.html 239) the network path between Alice and her entry node (and between the
volunteer.html 240) exit node and Bob) as a single link on some graph. In practice,
volunteer.html 241) though, the path traverses many autonomous systems (ASes), and <a
volunteer.html 242) href="http://freehaven.net/anonbib/#feamster:wpes2004">it's not uncommon
volunteer.html 243) that the same AS appears on both the entry path and the exit path</a>.
volunteer.html 244) Unfortunately, to accurately predict whether a given Alice, entry,
volunteer.html 245) exit, Bob quad will be dangerous, we need to download an entire Internet
volunteer.html 246) routing zone and perform expensive operations on it. Are there practical
volunteer.html 247) approximations, such as avoiding IP addresses in the same /8 network?</li>
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volunteer.html 248) <li>Tor doesn't work very well when servers have asymmetric bandwidth
volunteer.html 249) (e.g. cable or DSL). Because Tor has separate TCP connections between
volunteer.html 250) each hop, if the incoming bytes are arriving just fine and the outgoing
volunteer.html 251) bytes are all getting dropped on the floor, the TCP push-back mechanisms
volunteer.html 252) don't really transmit this information back to the incoming streams.
volunteer.html 253) Perhaps Tor should detect when it's dropping a lot of outgoing packets,
volunteer.html 254) and rate-limit incoming streams to regulate this itself? I can imagine
volunteer.html 255) a build-up and drop-off scheme where we pick a conservative rate-limit,
volunteer.html 256) slowly increase it until we get lost packets, back off, repeat. We
volunteer.html 257) need somebody who's good with networks to simulate this and help design
volunteer.html 258) solutions; and/or we need to understand the extent of the performance
volunteer.html 259) degradation, and use this as motivation to reconsider UDP transport.</li>
volunteer.html 260) <li>A related topic is congestion control. Is our
volunteer.html 261) current design sufficient once we have heavy use? Maybe
volunteer.html 262) we should experiment with variable-sized windows rather
volunteer.html 263) than fixed-size windows? That seemed to go well in an <a
volunteer.html 264) href="http://www.psc.edu/networking/projects/hpn-ssh/theory.php">ssh
volunteer.html 265) throughput experiment</a>. We'll need to measure and tweak, and maybe
volunteer.html 266) overhaul if the results are good.</li>
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revamp again
Roger Dingledine authored 18 years ago
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volunteer.html 267) <li>To let dissidents in remote countries use Tor without being blocked
volunteer.html 268) at their country's firewall, we need a way to get tens of thousands of
volunteer.html 269) relays, not just a few hundred. We can imagine a Tor client GUI that
volunteer.html 270) has a "help China" button at the top that opens a port and relays a
volunteer.html 271) few KB/s of traffic into the Tor network. (A few KB/s shouldn't be too
volunteer.html 272) much hassle, and there are few abuse issues since they're not being exit
volunteer.html 273) nodes.) But how do we distribute a list of these volunteer clients to the
volunteer.html 274) good dissidents in an automated way that doesn't let the country-level
volunteer.html 275) firewalls intercept and enumerate them? Probably needs to work on a
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more detail on the communic...
Roger Dingledine authored 18 years ago
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en/volunteer.wml 276) human-trust level. See our <a
en/volunteer.wml 277) href="http://wiki.noreply.org/noreply/TheOnionRouter/TorFAQ#China">FAQ
en/volunteer.wml 278) entry</a> on this, and then read the <a
en/volunteer.wml 279) href="http://freehaven.net/anonbib/topic.html#Communications_20Censorship">censorship
en/volunteer.wml 280) resistance section of anonbib</a>.</li>
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one pony is not enough.
Roger Dingledine authored 18 years ago
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volunteer.html 281) <li>Tor circuits are built one hop at a time, so in theory we have the
volunteer.html 282) ability to make some streams exit from the second hop, some from the
volunteer.html 283) third, and so on. This seems nice because it breaks up the set of exiting
volunteer.html 284) streams that a given server can see. But if we want each stream to be safe,
volunteer.html 285) the "shortest" path should be at least 3 hops long by our current logic, so
volunteer.html 286) the rest will be even longer. We need to examine this performance / security
volunteer.html 287) tradeoff.</li>
volunteer.html 288) <li>It's not that hard to DoS Tor servers or dirservers. Are client
volunteer.html 289) puzzles the right answer? What other practical approaches are there? Bonus
volunteer.html 290) if they're backward-compatible with the current Tor protocol.</li>
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revamp the volunteer page....
Roger Dingledine authored 18 years ago
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volunteer.html 291) </ol>
volunteer.html 292)
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un-list the installer todo...
Roger Dingledine authored 18 years ago
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en/volunteer.wml 293) <a href="<page contact>">Let us know</a> if you've made progress on any
en/volunteer.wml 294) of these!
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revamp the volunteer page....
Roger Dingledine authored 18 years ago
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volunteer.html 295)
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Move website to wml
Peter Palfrader authored 18 years ago
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en/volunteer.wml 296) </div><!-- #main -->
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revamp the volunteer page....
Roger Dingledine authored 18 years ago
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volunteer.html 297)
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Move website to wml
Peter Palfrader authored 18 years ago
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en/volunteer.wml 298) #include <foot.wmi>
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