Selinux

Introduction to Linux Hardening

I’ve seen many Linux systems compromised due to lack of proper hardening. To prevent this, you can use a combination of Mandatory Access Control (MAC) and namespace isolation. These two security features can help prevent unauthorized access to sensitive data and system resources. In this article, we’ll explore how to implement MAC and namespace isolation on a Linux desktop.

Mandatory Access Control

Mandatory Access Control is a security feature that enforces a set of rules defining what actions a user or process can perform on a system. One popular MAC system for Linux is SELinux (Security-Enhanced Linux), which was integrated into the Linux kernel in 2003. SELinux provides a robust security framework that can help prevent attacks such as buffer overflows and privilege escalation. Don’t bother with other MAC systems unless you have a specific reason to - SELinux is well-maintained and widely supported.

Security-Enhanced Linux (SELinux) is a security module integrated into the Linux kernel that provides a mechanism for enforcing mandatory access controls (MAC). Unlike traditional discretionary access controls (DAC), which rely on user permissions, SELinux applies security policies that define what actions processes and users can perform on a system. This results in a more robust security model, minimizing the risk of privilege escalation and unauthorized access.

Why Use SELinux?

SELinux enhances the security of Linux systems by enforcing strict access controls. It is particularly useful for environments where security is a priority, such as servers, enterprise systems, and containers. Key benefits include: