[Bug 3271] New: Interface to send commands to the server side ssh

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3271

            Bug ID: 3271
           Summary: Interface to send commands to the server side ssh
           Product: Portable OpenSSH
           Version: 8.5p1
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: ssh
          Assignee: unassigned-bugs at mindrot.org
          Reporter: mdione at grulic.org.ar

With ~.C it's possible to open a command line to send commands/options
to the server side of an ssh session. This is recommended for f.i.
adding redirections after the session has been open. See
https://unix.stackexchange.com/questions/576947/add-forward-during-ssh-session-dynamically

My suggestion is to create an interface to send those commands from the
command line or scripts. One option would be a unix socket laying
around and an envvar pointing to it.

I understand this could be a security hazard, so maybe this can be
disabled by default and only be enabled on the client's command line,
and maybe it could accept only a subset of all the commands/options ssh
supports.

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