tor-dev

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June 2015

37 participants
51 discussions

Tor Browser IsolateSOCKSAuth behavior questions.
by Yawning Angel 01 Jun '15

01 Jun '15

Hello, I've been working on a dumb hack that lets me do things like this: https://imgur.com/3mah244 (Yes, that's a single Tor Browser instance, separate windows used for illustrative purposes.) It's still very raw and doesn't do everything I want it to do, so I'm not really releasing the code yet, but I have some questions regarding how Tor Browser behaves when setting the SOCKS username for isolation purposes. Ideally I want my shim to enforce isolation between the various upstreams (Tor, I2P, whatever) correctly to avoid cross-protocol probing (and to shield the I2P administration interface from eeevil websites). This appears to be straight forward if the application is Tor Browser because IsolateSOCKSAuth is always used at first glance (I will assume for now that if users decide to use things like torsocks that do not use isolation this way that they know what they are doing). My question is, what causes Tor Browser to set the SOCKS username to "--unknown--" and what the behavior should be in that case if: * The destination is a ".onion" address. * The destination is a ".i2p" address. * The destination is the I2P management console. I'm fairly sure this should be "deny". * The destination is any other address (will be dispatched over Tor if running, I don't think I will attempt to support I2P outproxies because they suck). (I think allow because things break otherwise?) For destinations that are ".onion"/".i2p", I plan to be fairly strict about making sure the SOCKS5 target and the username matches (I need to be more relaxed for sites on the regular intertubes since cross-site resources are loaded (I may make this behavior configurable...). Is this dumb? Is it common for "foo.onion" to load resources off "bar.onion"? How about in I2P land? The final form of my shim will support running with any combination of "nothing" (Tor Browser just for the "privacy benefits", probably unsafe, I may reconsider this), I2P, and Tor (Though the most useful configuration is probably I2P + Tor). Thanks in advance, -- Yawning Angel

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