topic Restrict outgoing telnet but allow incoming telent on same box in Operating System - Linux

Restrict outgoing telnet but allow incoming telent on same box

Jason_97 — Tue, 02 Jul 2002 13:00:10 GMT

How do I allow users to telnet into one specific server for which they are authorized but prevent them from being able to telnet from that box to other servers ? Also, will SSH or NIS+ help?

Thanks a lot.

Re: Restrict outgoing telnet but allow incoming telent on same box

Jonathan Sharp_1 — Tue, 02 Jul 2002 14:56:24 GMT

Move the telnet binary to somewhere else (to your home directory per say. But if you're trying to do any sort of control, look at chrooting a user's shell and remove the telnet binary from the chroot. See http://ibiblio.org/pub/Linux/docs/howto/Chroot-BIND-HOWTO (while this is chrooting bind, it should get you started in the right direction)

Re: Restrict outgoing telnet but allow incoming telent on same box

Stuart Browne — Wed, 03 Jul 2002 00:19:20 GMT

The other option is a network/firewall option, deying anything not bound for the local interfaces with a destination port of 23 (telnet).