How do I restrict access to Linux server?

Resolution

1. Create the restricted shell. …
2. Modify the target user for the shell as restricted shell. …
3. Create a directory under /home/localuser/ , e.g. programs. …
4. Now if you check, the user localuser can access all commands which he/she has allowed to execute.

How do I setup a restricted ssh user for port forwarding?

How to create a restricted SSH user for port forwarding?

1. execute shell commands.
2. access files or upload files to the server.
3. use the server as proxy (e.g. webproxy)
4. access local services which were otherwise not publicly accessible due to a firewall.
5. kill the server.