Msquared wrote:
On Wed, Dec 03, 2003 at 11:16:05AM -0600, John Mathey wrote:
I had configured a system to prevent a user from logging into a system via telnet, but I can't remember now how I did it. Right after the motd was displayed, another banner would show up saying this is a closed system and shortly thereafter, they were logged out.
It depends on what your requirements are. Do you need to allow ftp logins too? Do you need to allow them to retrieve mail via POP or IMAP?
If you want to block all access to the system for a specific user:
passwd -l luser
it's a workaround
If you only need to block login services (ftp, sftp, scp, ssh, telnet):
chsh -s /sbin/nologin luser
Have you tested that? If so, do you have some kind of firewall? If so, does your firewall block those services?
I'm absolutely sure that even you change the shell to nologin, users are still able to ftp.
-- Thien
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