Which technology implements Mandatory Access Control (MAC) security in Linux?

Mandatory Access Control (MAC) is a security mechanism that restricts the actions that users can perform on a system based on the authority assigned to them, rather than the traditional Discretionary Access Control (DAC) model. In Linux, one of the technologies that implements MAC is SELinux (Security-Enhanced Linux).

SELinux provides a robust framework for enforcing the access control policy on processes and files. It enables administrators to define and implement rules that govern how processes interact with each other and the system resources. This means that even if users have certain permissions on files (like read or write access), SELinux can override these permissions based on its policy, providing an additional layer of security.

AppArmor is also a security module that provides a different form of access control, but it operates on a path-based model rather than the fine-grained rules of SELinux. Chroot is not a MAC mechanism; it is used to isolate a process within a specific directory tree but does not provide control over the security policies. UFW (Uncomplicated Firewall) is mainly a tool for managing firewall rules and does not implement MAC.

Therefore, the correct answer highlights the specific technology designed for implementing Mandatory Access Control in Linux environments, which is SELinux.