Allow user to set up an SSH tunnel, but nothing else

Question

I\'d like to allow a user to set up an SSH tunnel to a particular machine on a particular port (say, 5000), but I want to restrict this user as much as possible. (Authentica

Answer 1

You'll probably want to set the user's shell to the restricted shell. Unset the PATH variable in the user's ~/.bashrc or ~/.bash_profile, and they won't be able to execute any commands. Later on, if you decide you want to allow the user(s) to execute a limited set of commands, like less or tail for instance, then you can copy the allowed commands to a separate directory (such as /home/restricted-commands) and update the PATH to point to that directory.