I have a server and I want to offer a tunnel through this server to some of my friends. But I want to limit the sites they can access using this tunnel.
My plan was to create a user account without shell access, so that they can connect using ssh to have a tunneling socks proxy.
Is there a way to limit the sites a linux user can access?
It would be nice, if a URL based white-listing is possible, but IP based white-listing would also be okay. Are there any other secure(!) software solutions to solve this?
Thanks in advance