[tor-dev] Development of an HTTP PT

dardok dardok at riseup.net
Sun Nov 17 14:22:44 UTC 2013

Hash: SHA512

George Kadianakis:
> dardok <dardok at riseup.net> writes:
>> Hi, I am quite new in here but I am interested to help and
>> improve the TOR system. I am interested in PTs and particularly
>> in developing a HTTP PT.
>> I've read some papers [0],[1],[2],[3] and the ticket #8676 and I 
>> consider that it would be a good idea to make an effort and try
>> to implement the HTTP PT as is stated in the ticket, that is
>> using real browser and server services.
>> After talking with asn, we conclude that a good point to start
>> this development may be to focus on the HTTP transport part, that
>> is to know how to control the browser or the server and how to
>> embed the TOR traffic into the HTTP protocol (requests and
>> responses). Things such as the data obfuscation, the delays in
>> the communications and the packet chopping won't be considered,
>> because it may be used another PT such Scramblesuit to do that
>> task.
>> The CLIENT side:
>> TBB <-> Scramblesuit PT <-> HTTP PT <-> CENSOR NET
>> and the SERVER side:
>> CENSOR NET <-> HTTP PT <-> Scramblesuit PT <-> TOR bridge
>> The important is to know how to embed the TOR traffic already 
>> obfuscated into the requests and responses to avoid suspicion.
>> Also as I said before, to know how to control a browser binary to
>> make the HTTP traffic from the client side as much traditional as
>> possible, for instance using a firefox binary or something like
>> that. The same must be applied to the server side, implementing a
>> real NGINX server or an Apache server on port 80 and writting
>> some CGI to classify the traffic incoming from the TOR clients
>> through the HTTP requests. The same server may have another CGI
>> to write and send the HTTP responses to those TOR clients with
>> the traffic into them.
>> I would like to find someone interested to work on this topic.
> Hey there,
> we discussed this project on IRC and looking at your post it seems 
> that you understood things :)
> Like I told you, I'm interested in this topic, but my free time is 
> miniscule these days. Still, I'd like to help you out. Do you know 
> what you need help with?
> If you want, we can organize a meetup in IRC to discuss and plan 
> future work on this.
> It would be great if you prepared a bit of research on the basic 
> components of this project [0] so that we can discuss the various 
> options during the meeting. I'll send you an email to find the
> right date and time for the meeting :)
> Cheers!
> [0]: ways to control a browser from within a PT (selenium?), HTTP
> covert channels, designs of how a server-side CGI script would
> work, etc. _______________________________________________ tor-dev
> mailing list tor-dev at lists.torproject.org 
> https://lists.torproject.org/cgi-bin/mailman/listinfo/tor-dev


I've been reading about Selenium web-browser driver thing and I
consider that is not very handy to do what an HTTP PT client side
needs, that is to forge HTTP requests and embbed the TOR traffic into
these HTTP requests.

It is more oriented to emulated a web user interaction with a real
browser (such as firefox, chrome, opera, ie, ...) and the interaction
and testing of web apps from these browsers.

Also I cannot see how to handle the responses from the server-side
using this thing. Few functions seem to be interesting regarding HTTP
protocol handling and manipulation, as I said before most of the
functions present are related with the user interaction.

The Python version can be installed easily: pip install selenium

The already implemented functions can be read on this file:

I didn't find any useful function to allow a HTTP PT (client side)
embed the TOR traffic into HTTP requests (maybe some cookie function
related) and extract the information sent by the HTTP PT server side
(maybe some get_body_text() or get_text() funtion).

So I am ready to consider that this option is not be useful to
implement a HTTP PT client side. Anyway, I would like to discuss this
point with someone interested in this topic.



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