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Dev/anon-ws-disable-stacked-tor

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Why?[edit]

See DoNot#Prevent_Tor_over_Tor_scenarios.

Implementation[edit]

TODO: needs update (moved to socat with Whonix 13 anon-ws-disable-stacked-tor 3:2.4-1 stable upgrade)

Implemented in three ways on Whonix-Workstation.

  • Implemented in anon-ws-disable-stacked-tor, debian/control. The package uses the "Provides: tor" field[1], which should avoid any kinds of conflicts, in case upstream releases a higher version of Tor. This won't work for packages, which depend on an explicit version of Tor (such as TorChat). This is non-ideal, since for example the torchat package will install Tor, but still acceptable, because of the following additional implementations.
  • Tor's autostart is disabled in /etc/default/tor (dpkg-diverted using config-package-dev), so even if the tor package gets installed, it won't be automatically started.
  • rinetd is configured by /etc/rinetd.conf to listen on
    • Tor's default ports. I.e.
      • system Tor's 127.0.0.1:9050, 127.0.0.1:9051 and,
      • Tor Browser's 127.0.0.1:9150, 127.0.0.1:9051
      • Tor Messenger's 127.0.0.1:9152, 127.0.0.1:9153
    • Those are forwarded to Whonix-Gateway.
    • This prevents the default Tor Browser, Tor Messenger and/or Tor package by The Tor Project from opening these default ports, which will result in Tor failing to open its listening port and therefore exiting, thus preventing Tor over Tor.

https://forums.whonix.org/t/socat-running-on-ws-called-from/2225

https://www.whonix.org/wiki/Dev/Whonix_Packages#anon-ws-disable-stacked-tor

We mimic a functional Tor as good as possible.

anon-ws-disable-stacked-tor is also providing:

  • Tor Control Unix Domain Socket file: /var/run/tor/control, which is redirected to Control Port Filter Proxy on Whonix-Gateway.
  • Tor Control Auth Cookie: a functional /var/run/tor/control.authcookie that works with Control Port Filter Proxy.
  • Tor Socks Unix Domain Socket file: /var/run/tor/socks that is redirected to Whonix-Gateway Tor port 9050

https://github.com/Whonix/anon-ws-disable-stacked-tor/blob/master/etc/anon-ws-disable-stacked-tor.d/30_anon-dist.conf

Required for Tor Browser connectivity, SocksSocket:

https://cloud.githubusercontent.com/assets/156128/21556064/8ead0338-cdd2-11e6-918c-d4ca61724b52.png any should work.

Debugging[edit]

Run.

[select code]
echo "$TOR_SOCKS_IPC_PATH"

Should show the following. 

/var/run/anon-ws-disable-stacked-tor/127.0.0.1_9150.sock

Run.

[select code]
echo "$TOR_CONTROL_IPC_PATH"

Should show the following. 

/var/run/anon-ws-disable-stacked-tor/127.0.0.1_9151.sock

Also please run.

[select code]
UWT_DEV_PASSTHROUGH=1 curl 127.0.0.1:9150

Should show the following. 

<html>
<head>
<title>Tor is not an HTTP Proxy</title>
</head>
<body>
<h1>Tor is not an HTTP Proxy</h1>
<p>
It appears you have configured your web browser to use Tor as an HTTP proxy.
This is not correct: Tor is a SOCKS proxy, not an HTTP proxy.
Please configure your client accordingly.
</p>
<p>
See <a href="https://www.torproject.org/documentation.html">https://www.torproject.org/documentation.html</a> for more information.
<!-- Plus this comment, to make the body response more than 512 bytes, so      IE will be willing to display it. Comment comment comment comment      comment comment comment comment comment comment comment comment.-->
</p>
</body>
</html

Run a similar command. 

echo GET | socat - UNIX-CONNECT:/var/run/anon-ws-disable-stacked-tor/127.0.0.1_9150.sock

Should show the same as above.

Next one to try.

[select code]
UWT_DEV_PASSTHROUGH=1 curl 127.0.0.1:9151

Should show the following. 

510 Request filtered
...

Run a similar command. 

echo GET | socat - UNIX-CONNECT:/var/run/anon-ws-disable-stacked-tor/127.0.0.1_9151.sock

Should show. 

510 Request filtered

Footnotes[edit]

  1. ↑ See "7.5 Virtual packages - Provides" on http://www.debian.org/doc/debian-policy/ch-relationships.html
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