8

ssh_config's ProxyCommand allows to establish some connection to a proxy prior to establishing the connection to the actual target machine.

Simple question: how can I leverage the dynamic or SOCKS proxy functionality built into ssh such that I don't have to rely on nc or socat to be installed and TCP redirection to be compiled into the installed Bash?

I have literally only found examples of the above all over the web.

13

If the ssh on the proxy side is new enough (>= OpenSSH 5.4), you can use its -W option which works similar than nc. Add to the corresponding entry in your .ssh/config file:

ProxyCommand ssh -W %h:%p PROXYHOST

Example:

Host TARGETHOST
  ProxyCommand ssh -W %h:%p PROXYHOST
  HostName 10.0.0.1
  • 2
    if the PROXYHOST takes a different user than TARGETHOST, you can specify it at the end of ProxyCommand with -l <proxyuser>. And for the TARGETHOST you specify it on a different line with User <targetuser> – Ciprian Tomoiagă Dec 20 '16 at 11:09

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