stopping particular service access in telnet

[Srikara.D]

hi,

Can we stop a user from using a particular service like reboot..etc to a user who has
telneted into our machine ?

thanks in advance

[Ivan Ferreira]

Check the information in this link:

http://www.redhat.com/docs/manuals/linux/RHL-9-Manual/custom-guide/s1-access-console-program.html

[Kapil Jha]

just give normal permissions to the user through which it is coming through telnet.
Don give him special priveledges which would allow him to do some damage to system.
It is applicable to normal user aalso doesn't necessary to be a user through telnet.
BR,
kapil

[loco_vikide]

ACL (Access Control List) could be used to assign or deny privileges.

[Stuart Browne]

If it's just a 'user', then they shouldn't have access to those commands anyway. Check the permissions on them to ensure they aren't suid-root.

If you're talking about a user who has 'sudo' access, then look at the documentation in 'man sudoers'.

If you're talking about a user who has 'su' access, well you can't without writing wrappers around them (which I wouldn't recomend).

[sandeep mathur]

check out
iptables -A INPUT -s --dport 23 -j DROP.

at the iptables file
then for ftp same as above but --dport 21
ssh 22