ssh

In newer releases of OpenSSH it’s almost as easy as ProFTPD’s DefaultRoot to restrict a user to the home folder. You no longer need to setup a full chroot environment including copies/links to essential libraries etc.

If you want to put a backdoor^H^H^H^H^H^H^H^HSSH Tunnel in the background, just use the options f for background and N for no commands, doing just port forwarding.

ssh -f -N -R 1234:localhost:22 vps01.example.org