tor-dev March 2014

tor-dev@lists.torproject.org

84 participants
103 discussions

inTORface - a potential GSoC idea
by Jacek Wielemborek 15 Mar '14

15 Mar '14

Hi, I know there's not much time to apply, but I figured that it's worth asking anyway. I recently gave Tails a try and I have to admit that I wasn't exactly happy with how it routes the traffic through Tor. I basically wanted a ready-to- use airgapped VM and I realized that torsocks doesn't exactly do what I want in all cases. Then I had this idea - wouldn't it be nice to add another virtual NIC to your system that routes all the traffic via Tor and attach a VM to this traffic only? It'd emulate TCP/IP (and maybe some UDP to catch DNS requests) so that if the VM sends a SYN, it notes this fact and tries to establish a real connection. I'm not sure I could hasten to build a prototype, but I wanted to throw the idea there nonetheless. What do you think about it? Yours, Jacek Wielemborek

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GSoC - Tor pluggable transports project
by quinn jarrell 15 Mar '14

15 Mar '14

Hi Tor Devs, I'm a computer engineering undergrad at University of Illinois Urbana-Champaign. I am interested in working on a GSoC pluggable transports project. I mainly code in python or common lisp and have worked with asynchronous programming before (albeit it was a java framework not twisted). The two projects I am interested in are the pluggable transports combiner or building the CBR transport plugin. I really like the idea of the transport combiner but I have a few questions about how far along the design/implementation is. I noticed that there is a prototype called obfs-flash proxy and am wondering if I would work on extending that to work with other plugins or if I would work on a separate combiner. Is the design set in stone yet or is the spec for it still shifting? And if the spec is still shifting, how should I address that in my GSoC proposal. I also talked with Yawning in IRC who pointed me to the CBR transport plugin/unix like plugins to change data length/obfuscate data/add noise. I love the idea that with the combiner a CBR transport could be easily added to any existing transport but if the combiner has not been built/the spec is still developing, I wonder how useful it would be. Also the CBR plugin does not seem to be enough work for a GSoC project but I could definitely be underestimating the difficulty. I would like to work on either of these projects but I do not know which one would be the more helpful/necessary so i would love to hear your opinions on which would be better to work on. Thanks, Quinn

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GSOC Proposal - Improving test coverage in tor
by Punit 15 Mar '14

15 Mar '14

Hello, I have uploaded my GSOC Proposal for the project - "Improving test coverage in tor" at the Melange site. An external link to the same is :- http://punitkoura.github.io/GSOC_proposal.html I would like to know your comments on the same. Thanks, Punit PS - I am working on ConnectionEdge.c in making test cases for connection_edge_process_inbuf function. I will update the proposal when done.

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test_memcpy() on Windows
by Gisle Vanem 14 Mar '14

14 Mar '14

The 'test_memcpy()' in tinytest_demo.c assumes there is a NUL in one of the buffers. (the comment says so). That's not the case here on Windows. At least not in MSVC debug-mode where malloc'ed buffers are filled with '0xCD'. A snippet from my output: ../ext/tinytest_demo.c:159: assert(db->buffer1 < db->buffer2): 537472696E67203000CDCDCDCDCDCDCDCDCDCDCDCDCD ... vs 537472696E67203000CDCDCDCDCDCDCDCDCDCDCDCD ... [memcpy FAILED] I assume this test works on Linux where AFAICS malloc() returns a buffer with zeros. If so, shouldn't calloc() be used in 'setup_data_buffer()' instead? --gv

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[Patch] tinytest_demo.c
by Gisle Vanem 14 Mar '14

14 Mar '14

Since tinytest_demo.c now calls Sleep(), we must include <windows.h>. Patch: --- Git-latest/src/ext/tinytest_demo.c 2014-03-13 20:44:56 +0000 +++ src/ext/tinytest_demo.c 2014-03-14 11:21:56 +0000 @@ -36,7 +36,10 @@ #include <string.h> #include <errno.h> #include <time.h> -#ifndef _WIN32 + +#ifdef _WIN32 +#include <windows.h> +#else #include <unistd.h> #endif -------------- Ref. Nicks commit here: https://gitweb.torproject.org/tor.git/commitdiff/1365ff5b9a04a7da2acc2e52df… --gv

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No IRC meeting to discuss Tor Instant Messaging Bundle today
by Karsten Loesing 14 Mar '14

14 Mar '14

Hi devs, we had an IRC meeting last week, on March 7, to discuss next steps for the Tor Instant Messaging Bundle (TIMB). At the end of that meeting we decided to have another meeting 1 week later, so today. However, there will be no such meeting today! The main reason for today's meeting was to make a decision on an instant messaging client to use in the new bundle. But we already made this decision in internal discussions with the main developers Arlo and Sukhbir. The final decision is that we're going to use Instantbird. The wiki page states some reasons for this decision: https://trac.torproject.org/projects/tor/wiki/org/sponsors/SponsorO/TIMB If you had planned to attend today's meeting to find out how to best help out with the project, please be patient. The project is still in an early state, and we don't have a good list of things that we need help with. Maybe take a look at the Trac tickets in the TIMB component and at the wiki page linked above. There will be IRC meetings in the future to discuss progress on this project, I just can't say when that will be. Thanks for your patience, and thanks for wanting to help out! All the best, Karsten

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A few questions about defenses against particular attacks
by Yuhao Dong 14 Mar '14

14 Mar '14

Hi, I am currently working on a personal project implementing an onion-router, vaguely similar to Tor (let's just call it Oor, other onion router, for the moment), and I have a few questions about attacks, which I think are not really protected by Tor, and whether my solution could possibly work. Of course, if Tor defends against such attacks, then please enlighten me. - Traffic volume correlation. Tor's FAQ says that it doesn't plan on defending against an adversary monitoring traffic volumes flowing through the Tor network. Oor tries to protect against this attack by: - Obfuscating every single link with a protocol derived by Tor's obfs3 protocol - No public list of all node addresses; this makes determining whether certain traffic is Oor traffic much harder. More at the next bulletpoint - Splitting each circuit (termed "onion stew") into many subcircuits, all terminating at the same exit node. à la multipath TCP. Cells going through the subcircuits have a randomly-determined *uneven *distribution of choice of subcircuit, barring attackers from deducing total traffic from observing one subcircuit. - Blanket blacklist attacks by censors. Censors can poll the directory and block all ordinary Tor nodes. (obfsproxy) bridges are a workaround. - Oor's directory maintains a *graph* of all nodes. Each node knows the public keys of all the other nodes, but each node only knows the addresses of *adjacent* nodes. - Note that this allows (sub)circuit-building along any path in the graph. The "extend circuit" command takes the next node's public key as the parameter, rather than the address. - This reduces the bootstrapping problem to distributing (an alias of) the directory server address. Unlike with Tor bridges, this does not create a bandwidth bottleneck, and no nodes need to be reserved for a special pool of bridges, unable to be used by usual users. Bridges often go offline, but this would work until the alias is blocked. However, as with Tor bridges, things like e-mail can be used to distribute many dynamically-generated aliases of the directory server. - Protocol recognition. In "free" countries like the US of A, Tor users see no pressure to use obfuscated bridges. Tor traffic is rather easily distinguished, and could be used to form suspicion on people. Even with obfsproxy, Tor's constant 512-byte cell length may be an issue. The "Stegotorus" paper presents a filter that finds cell lengths typical of Tor. - Every link is obfuscated in oor with obfs3. - obfs3 happens to create various cell lengths. This would be a problem for Tor-like circuits because it doesn't hide data sizes at all, but I think that breaking circuits into subcircuits solves this problem. There is a not-really-working but readable PoC implementation of everything except the "onion stewing" part, i.e. circuits can only work with one subcircuit, athttps://github.com/quantum1423/kirisurf-dev/ Current work is underway to rewrite a more robust version with various repos at https://github.com/KirisurfProject/ (yes, it is currently called Kirisurf, oor is just for short previously, and I want to change the kirisurf name anyways. You may find a "kirisurf" on sourceforge. That is a simple one-hop encrypted proxy I made a long time ago just for breaking censorship without privacy protection; Kirisurf gradually grew onion-routing things until I decided to redesign it; namechange probably needed to prevent misleading version numbers) I would be interested to know what research has been done on these areas in Tor (to avoid reinventing the wheel), and whether any of my ideas are novel. Thanks!

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Fwd: [Twisted-Python] Tor Project has GSoC projects which need Twisted developers!
by isis 14 Mar '14

14 Mar '14

I sent this to the Twisted mailing list at twisted-python(a)twistedmatrix.com -- ♥Ⓐ isis agora lovecruft _________________________________________________________ GPG: 4096R/A3ADB67A2CDB8B35 Current Keys: https://blog.patternsinthevoid.net/isis.txt

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Pluggable transports meeting tomorrow (Friday 14th of March 2014)
by George Kadianakis 13 Mar '14

13 Mar '14

Greetings humans, this is an email to remind you that the regular biweekly pluggable transports meeting is going to happen tomorrow. Place is the #tor-dev IRC channel in OFTC. Time is 17:00 UTC. Cheers!

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GSoC - Search Engine for Hidden services
by Nurmi, Juha 13 Mar '14

13 Mar '14

Hi All, Ahmia.fi interested in participating in GSoC. Ahmia.fi's back-end is designed by Kordex (Mikko Kortelainen) and I (Juha Nurmi) have built the front-end. In practise, I will apply as a student. Also, kordex might apply. Ahmia.fi is a HS search engine that needs improvements. At the moment, we are using YaCy in the back-end and have developed Django based front-end (Python). Kordex is a Customer Service Architect, CEO of the Fail-Safe IT solutions and software designer. I am a research, postgraduate student and university lecturer. I have a long work experience with web services. At the moment, ahmia.fi has integration to Tor2web and Globaleaks. We have hidden service online cheker, RESTful API for the resources, tested idea how hidden services could publish their information ( https://ahmia.fi/documentation/descriptionProposal/) and a lot of good ideas. Unfortunately, we do not have any funding. We would like to release the source code of ahmia.fi and develop our search engine in GSoC. Greetings Juha Nurmi

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tor-dev March 2014