Bind to ssh keys
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apt-dater-host can be bind on a ssh key:

$ cat ~/.ssh/authorized_key
command="/usr/bin/apt-dater-host sshkey",no-port-forwarding ssh-dss <ID.PUB> apt-dater@ibh.net

This will prevent you from using 'connect' within apt-dater to open
a shell on the client.
