Don't know enough to help with OpenSSH server config. However, the main problem I see is: you want this on port 22. You could take the approach many git servers do: the user named "git" has a special shell allowing only specific operations (that would correspond to your script). Since you need to be root anyway(*), this looks like the easier approach. Your users then connect 
ssh yourserviceuser@yourhost

[download]
and if your script needs their "real" credentials, it can ask them (or, like git, distinguishes them by their SSH key).

(*)Update: for configuration, not for running it

In reply to Re^9: SSH daemon in Perl? by soonix
in thread SSH daemon in Perl? by robs87

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