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A Brief Discussion of Linux Security
Linux is customizable and can be run with many network services.
An in-depth discussion of Linux Security is beyond the scope of this presentation.
However, here are a few things to keep in mind when securing your Linux
System:
Turn off unused Services:
In Red Hat, logged in as root, type setup at the command line prompt.
This will launch a menu based program. Select System services from the
menu, then Run.
Listed here are all of the services that are started up
when your server is first launched. You can select and deselect the services.
If you are not using it, turn it off.
Learn how to configure xinet.d services:
Xinet.d services need to be enabled and disabled individually. All of
these settings for these programs can be found in the /etc/xinetd.d directory.
Each individual settings file can be modified (root level access needed)
with the line that says disable ( = yes or no). A more complex way of
limiting services in the xinet.d settings is limiting services with all
sorts of options such as limiting by port numbers, or by IP numbers.
Set up a Firewall:
IPCHAINS or IPTABLES are commonly used to control traffic going in and
out of a network.
Subscribe to Security Lists:
There are security update discussion lists that are available to subscribe
to for the various Linux distributions. Check those out to stay updated
on the latest threats and patches to your system.
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