Informing the SSH agent of the target user at server

Peter Stuge peter at
Thu Mar 22 03:52:57 AEDT 2018

Hector Martin 'marcan' wrote:
> > Since forwarding ssh processes just forward agent socket bytes
> > without tracking the protocol state in that stream adding a packet
> > isn't trivial.
> It's reasonably trivial if the definition is that the forwarded-for
> extension chain happens once when agent connections are opened. Then the
> ssh process just needs to send the extension, wait for the reply
> (whether positive or not-supported), eat it, and move on with forwarding
> the remaining bytestream.

I wouldn't like to introduce a hard requirement for agent socket
connections to only perform private key operations for a single nexthop.

The OpenSSH ssh client is but one agent socket consumer...

But I'm all for the idea for case 1.


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