But if you need commit access you'll have to setup ssh proxy tunnel. One options is using [http://www.torproject.org/ Tor]. So, install all requirements:
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* [http://www.torproject.org/ Tor] to make tunnel via Tor network
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* [http://www.meadowy.org/~gotoh/projects/connect/ connect] to let ssh using this tunnel
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You don't need any special configs for this software(in case of Tor if your distribution makes some smart pre-configurations, just remove /etc/tor/torrc).
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Setup your tunnel in ssh. Add followed lines to your ~/.ssh/config