On Sat, Aug 19, 2000 at 05:53:26PM +1000, Zlatko wrote:
> Can someone please tell me how to close open ports/services on LInux
> RH 6.2:
> I wan to know how can I prevent services like ftp, telnet, finger, cmd,
> ASR to start automaticly every time the system boots up?
These services usually run off inetd. To disable, comment the
corresponding entries in /etc/inetd.conf then run:
# killall -HUP syslogd
If you want to totally disable inetd, run:
# chkconfig --del inetd
You can also view a list of programs that are run at startup
with:
# chkconfig --list
BTW, the numbers 0-6 from the output of chkconfig are runlevels
and simply says which programs are run for that particular
runlevel. To know your current runlevel, run:
# runlevel # current one is on the right
To know which ports you have open:
# netstat -tln # TCP
# netstat -uln # UDP
To know which particular program listens on a port:
# lsof -i :23 # who listens on telnet port?
> Which is the configuration file. I had intrusion recently.
There's a possibility that the intruder has installed some trojan
on your system which could e.g., allow him remote access again in
the future, wipe your system at some future date, etc. In a
security standpoint, you can't trust your system anymore after an
intrusion.
Hopefully, you can maybe run "rpm -Va" to check the integrity of
your files against the rpm database. Though I doubt if you can
also trust the rpm database anymore.
--
.--. Michael J. Maravillo office://+63.2.894.3592/
( () ) Q Linux Solutions, Inc. http://www.q-linux.com/
`--\\ Open Source Consultancy / Support / Training / Software Dev't.
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