[mosh-users] Mosh support for direct login to weird shell

[Keith Winstein]

I think you can achieve the "best" outcome as follows.

(1) sshd forces the user to run a particular command, e.g. with the
ForceCommand mechanism or "command=" in authorized_keys. This command is a
script that works as follows.

(2) The script checks to see what the user-requested command is (stored in
the SSH_ORIGINAL_COMMAND environment variable).

(3a) If SSH_ORIGINAL_COMMAND is blank or doesn't contain "mosh-server", the
script runs the BBS program. End.

(3b) If SSH_ORIGINAL_COMMAND contains "mosh-server":

(4) The script scans the command-line and collects the -s, -i, -p, and -c
arguments, if any.

(5) The script then runs mosh-server new [args] -- bbs_program. End.

Another option is just to edit the mosh-server source code to just hardcode
the BBS program as the thing it runs (ignoring any command-line argument or
the user's shell).

Hope this helps. Cheers,
Keith

On Sun, Aug 4, 2013 at 11:13 PM, Gordon Morehouse <gordon at morehouse.me>wrote:

> Hi there,
>
> I have an old BBS program that allows ssh login by means of simply
> executing it as the user's shell; this presents problems for mosh users.
>
> I'm wondering how to work around it.
>
> Best: mosh users connect to the same user at domain.com as everyone else
>
> Good: mosh users connect to a different user2 at domain.com, mosh starts
>       up, then they immediately must execute the BBS shell with no
>       chance to 'escape' (eg, run a real shell)
>
> Any other possibilities?
>
> Ways to run certain programs (eg mosh-server) and *then* weird shells or
> a set program that (in general) doesn't allow the user to escape to a
> real shell?
>
> Thanks much,
> -Gordon M.
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