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I want to SSH to a machine C from machine A through B. Usually I would do:

A$ ssh user@B
B$ ssh user@C

I have to type passwords both times (no public key allowed). I would like to set up a control socket so that after typing both passwords I can ssh to C using the socket, perhaps typing something like:

A$ ssh -S socket C

Is this possible?

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You can use B as a jump host:

ssh -J user@B user@C

If your usernames or hostnames are long, you can add them to ~/.ssh/config:

Host hostB
    HostName some-long-hostname-of-B-or-its-ip
    User username-on-B

Host hostC
    HostName same-here-for-C
    User username-on-C

Then you can ssh like this:

ssh -J hostB hostC

The jump can also be configured for ssh hostC:

Host hostC
    HostName same-here-for-C
    User username-on-C
    ProxyJump hostB
  • @Fernando, I feel like your edits could be posted in an answer of their own - it's your original research based on what I've posted. If you could post them as a new answer, I'll be happy to upvote it. – gronostaj Oct 17 at 13:58
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To complement gronostaj's answer, here is how you create a socket with -J:

$ ssh -M -S socket -J user@B user@C -fN

Then to use the socket to log in to C:

$ ssh -S socket C

This way you are not required to type any passwords.

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