2

Finally yesterday I installed ubuntu 16.04 and after that I installed tor and obfs4. I add this line at the end of torrc file:

UseBridges 1
Bridge obfs4 82.243.119.185:990 B08238781C2CD80DBD95AEABEB6F6C75F2E2CEB6 cert=1udeMlFNs3sJ20zwpPE6nShZqqwDb3F1ET4KzfSfD+fktkue9zNx9H3t+yLCPAsg+6UTUA iat-mode=0
Bridge obfs4 192.36.31.173:42912 33DCA3BAD915D0F04CFAC6DF47B1BEB9E95E5C3A cert=3sBbfmp4fpIPpinXWbjZiVp+zWrK1kEUfmqNJNfszb8SXS+DeaVS4vQyvK7/fkU/TEPqVQ iat-mode=0
ClientTransportPlugin obfs4 exec /usr/bin/obfs4proxy --managed

But it didn't work, here is the log:

tail -f /var/log/tor/log
Jun 08 21:33:04.000 [notice] Delaying directory fetches: No running bridges
Jun 08 21:33:04.000 [notice] Signaled readiness to systemd
Jun 08 21:33:05.000 [warn] Could not launch managed proxy executable at '/usr/bin/obfs4proxy' ('Operation not permitted').
Jun 08 21:33:06.000 [notice] Bootstrapped 5%: Connecting to directory server
Jun 08 21:33:06.000 [warn] We were supposed to connect to bridge '82.243.119.185:990' using pluggable transport 'obfs4', but we can't find a pluggable transport proxy supporting 'obfs4'. This can happen if you haven't provided a ClientTransportPlugin line, or if your pluggable transport proxy stopped running.
Jun 08 21:33:06.000 [warn] Problem bootstrapping. Stuck at 5%: Connecting to directory server. (Can't connect to bridge; PT_MISSING; count 1; recommendation warn; host B08238781C2CD80DBD95AEABEB6F6C75F2E2CEB6 at 82.243.119.185:990)
Jun 08 21:33:06.000 [warn] We were supposed to connect to bridge '192.36.31.173:42912' using pluggable transport 'obfs4', but we can't find a pluggable transport proxy supporting 'obfs4'. This can happen if you haven't provided a ClientTransportPlugin line, or if your pluggable transport proxy stopped running.
Jun 08 21:33:06.000 [warn] Problem bootstrapping. Stuck at 5%: Connecting to directory server. (Can't connect to bridge; PT_MISSING; count 2; recommendation warn; host 33DCA3BAD915D0F04CFAC6DF47B1BEB9E95E5C3A at 192.36.31.173:42912)
Jun 08 21:33:06.000 [warn] We were supposed to connect to bridge '94.242.249.2:47282' using pluggable transport 'obfs4', but we can't find a pluggable transport proxy supporting 'obfs4'. This can happen if you haven't provided a ClientTransportPlugin line, or if your pluggable transport proxy stopped running.
Jun 08 21:33:06.000 [warn] Problem bootstrapping. Stuck at 5%: Connecting to directory server. (Can't connect to bridge; PT_MISSING; count 3; recommendation warn; host 52C5F1C15DCF6DAC47556EC1D4EC4BE5B24BDEC7 at 94.242.249.2:47282)

I'm beginner could you please help me where is the problem?

|improve this question
  • Do you have obfs4proxy installed? What is the output of ls -l /usr/bin/obfs4proxy? – Jens Kubieziel♦ Jun 9 '16 at 13:22
  • Yes I installed that. '-rwxr-xr-x 1 root root 6485536 مارس 22 16:09 /usr/bin/obfs4proxy' – Arian Haghighat Jun 9 '16 at 17:46
4

In your torrc there is the line

ClientTransportPlugin obfs4 exec /usr/bin/obfs4proxy --managed

Furthermoer the log file states:

Jun 08 21:33:05.000 [warn] Could not launch managed proxy executable at '/usr/bin/obfs4proxy' ('Operation not permitted').

According to the manpage of obfs4proxy there is no option --managed. This was used for obfsproxy. So if you delete the option --managed and restart Tor, it will start and use obfs4proxy.

|improve this answer
2

You could fix your problem with apparmor like this:

First open /etc/apparmor.d/abstractions/tor with your favorite editor (with root user)

  • sudo gedit /etc/apparmor.d/abstractions/tor

Then change the /usr/bin/obfs4proxy PUx, to /usr/bin/obfs4proxy ix, and save it!

And after that reboot

|improve this answer
  • Could you explain what the change from PUx to ix does? It might help future readers. – Jens Kubieziel♦ Jun 16 '16 at 12:48
  • @JensKubieziel Its about permissions.For example PU means: **P** - exec to profile that matches executable name, with environment variable scrubbing. **U** - exec to unconfined, with environment variable scrubbing. For more look at [wiki.apparmor.net/index.php/… Core Policy Reference) – Farbod Ahmadian Jun 16 '16 at 15:38
  • @FarbodAhmadian /usr/bin/obfsproxy PUx, /usr/bin/obfs4proxy ix, this is mine and still not work ! – alireza Oct 22 '16 at 20:20

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.