I am trying to set up a new user account I can give to friends so they can SSH into my forward computer, and only allow forwarding of certain ports.

I do not want my friends to have a shell, or be able to change what ports to where they are allowed to forward.

example session: joe(friend) connects using PuTTY (that I have pre-set, he isn't good with computers) to example.com(my Internet facing computer) forwarding ports 8080,1990,25565 to him(with what ever end ports he wants, preferably they stay the same numbers) example ssh command to do similar (but he can still change the ports on my computer!)

ssh -N [email protected] -p443 -L8080:192.168.1.2:8080 -L1990:127.0.0.1:1990 -L25565:127.0.0.1:25565

then, same story with other friend smith(same ports, same user even) except he is using linux, so cant use putty.

is it possible to also leave default SSH functinality for all other users but this one?

I found this when I was searching google, but alas, I did not quite understand what was being suggested, and I don't think they covered restricting port forwarding