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I used obfs3 as socks proxy with Openvpn and it was very easy to configure and operate.

I want to use obfs4 proxy. I am running Ubuntu 14.10, i have installed latest tor package version (Tor version 0.2.7.6 (git-605ae665009853bd)). and latest obfs4proxy version (obfs4proxy-0.0.4).

Server configuration as described in obfs4 docs and from this tor answer:

# /etc/tor/torrc in server

RunAsDaemon 1
ORPort 9001
BridgeRelay 1
ServerTransportPlugin obfs4 exec /usr/bin/obfs4proxy
ExtORPort auto
ServerTransportListenAddr obfs4 0.0.0.0:54554

Client configurations:

# /etc/tor/torrc in client
ClientTransportPlugin obfs4 exec /usr/bin/obfs4proxy

In obfs3, i could add --dest to server and add proxy {ip:port} on client. I cannot find this arguments any more on obfs4. How could i make Openvpn use tor with obfs4 as a proxy?

Also i noticed that when i stop tor service, obfs4proxy executable don't be terminated, and from the log on /var/log/tor/log I found these lines

Jul 21 12:39:27.000 [notice] Interrupt: exiting cleanly.
Jul 21 12:39:27.000 [notice] Failed to terminate process with PID '11673' ('Permission denied').

Note: The process with PID '11673' is the obfs4proxy process.

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Nasr
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1 Answers1

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You probably want to have a read through the Pluggable Transport specification, they're controlled and configured through environment variables. You'll need to set them appropriately to get it to work with OpenVPN. Note that obfs4 also requires the client to have a "certificate" to be able to connect.

I'm unsure why tor cannot terminate obfs4, maybe you've assigned it capabilities or made it setuid, we need more information.

Also Ubuntu 14.10 is dead and you should no longer be running it for anything, you won't get security updates, see: "Ubuntu 14.10 (Utopic Unicorn) End of Life reached on July 23, 2015".

cacahuatl
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