How to jail linux user

Question

Is there something similar to chroot, but for users?

We are about to grant access to our servers for a client and would like them to see only the directories we allow.

Answer 1

If you really want to go to that extreme, SE Linux (or any other mandatory access control) is a definite improvement of the default unix permissions.

Answer 2

A Google search on "openssh jail" led me to SSHjail for openSSH. If your client uses ssh/scp to access the said servers, this might be what you are looking for.

Answer 3

It is important to note that chroot(2) is not meant for security purposes. It is incredibly easy to escape a chroot jail. See this article on abusing chroot for more information.