Matjaz asked:


Linux is an alternative operating system for computers. It’s one of the most well-known example for free softwares and open source codes. It can be freely modified, used, and redistributed by anyone.

In the interest of the system’s security the most important and the available files are separated. Linux can be used by more users. This would make the computer more vulnerable but it doesn’t. The users don’t have access to the root’s applications so we can’t modify them accidentally. The viruses can’t access to the system settings because the configure files are in a /etc directory and all this together gives the stability of the Linux.

Security-Enhanced Linux (SELinux) is an extra security service. We can define in one configuration that who has access to which applications and server and network procedures. This makes our network more protected.
SELinux implements security policies with the use of Linux Security Modules. LSM is a framework that lets Linux kernel to support security models. It has a lot of features for example the interfaces are well-defined, the policy is very flexible and it support for policy changes. The controls over the file systems, directories, files, messages and network interfaces are strong.

SELinux has become available for simple users with in a package with Red Hat Enterprise Linux version 4 and all future releases as well. It can be installed not only with Red Hat but with Fedora, Hardened Gentoo and Yellow Dog as well.

www.infosecuritylab.com