Linux Security

Linux security encompasses the principles, tools, and configurations used to safeguard systems running the Linux operating system from unauthorized access, modification, or disruption. This multi-layered approach is fundamentally built on a robust permission model for users and groups, which governs access to files and resources. For more stringent control, it utilizes Mandatory Access Control (MAC) frameworks like SELinux or AppArmor to enforce system-wide security policies that constrain the actions of all processes, including those running with root privileges. The practice also extends to network security through firewalls, system monitoring via auditing and logging, and kernel hardening to minimize the attack surface and create a resilient computing environment.