On 11 Jul 2016, at 16:27, 김성민 dallas1004@gmail.com wrote:

Hi, I'm Ph.D. Student in KAIST, South Korea. I'm implementing a modified Tor on top of Intel SGX CPU to improve the security issues of Tor as a research. (Here is a related paper work [1, 2].) For this, we port the Tor source code on the VS2012 to build an SGX project. To make Tor running on top of SGX, we modified several lines of code of Tor and I think there is some mistake while printing a platform string.

Tor shouldn't produce output like the output we're seeing, unless the platform name retrieved by tor has been localised. (Which seems unlikely, as the platform name is reported correctly some times, and incorrectly other times.) What do you get if you compile a simple program that only contains the function that retrieves the Windows platform name?

It looks like you might be corrupting memory or mangling string processing. But it's very hard to help you unless we know what lines of code you changed, and how you changed them.

Currently, We successfully compiled a SGX-Tor binary and we ran it as a Tor relay for testing compatibility with existing Tor network. We tested a Tor client with our SGX-Tor and it successfully works. Is there any issues or rules to be considered for testing our SGX-Tor?

It should pass all the unit tests run using "make check". It should pass the integration tests run using chutney and "make test-network-all". https://gitweb.torproject.org/chutney.git/

If you do find that it's a programming error in tor, feel free to submit a patch, or a unit test that would catch similar errors in the platform string. https://trac.torproject.org/projects/tor

Tim

Thanks, Seongmin

[1] http://ina.kaist.ac.kr/~dongsuh/paper/kim-hotnets2015.pdf [2] http://ina.kaist.ac.kr/~dongsuh/paper/opensgx.pdf

2016-07-08 9:07 GMT+09:00 Tim Wilson-Brown - teor teor2345@gmail.com:

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On 8 Jul 2016, at 09:48, Tim Wilson-Brown - teor teor2345@gmail.com wrote:

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On 8 Jul 2016, at 09:41, nusenu nusenu@openmailbox.org wrote:

Hi Seongmin,

out of curiosity I was wondering whether your so called tor "platform" string ("??B`?\u0001") or your tor relay [1] was generated by a modified tor installation on Windows 8 or if we are looking at some bug in vanilla tor?

We plan on authorities rejecting descriptors with non-ASCII characters in 0.2.9, if we get it implemented before the code freeze. https://trac.torproject.org/projects/tor/ticket/18938

Hmm, I can't find an actual descriptor with these characters in it. The latest descriptor I can find for this relay has a normal platform line: https://collector.torproject.org/recent/relay-descriptors/server-descriptors...

Could this be a bug in Atlas?

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thanks!

[1] https://atlas.torproject.org/#details/21E84B294794821E2898E8ED18402E45E4FC35...

descriptor containing that platform string: https://collector.torproject.org/recent/relay-descriptors/server-descriptors...

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