What are the three types of SELinux modes?

The three types of SELinux modes are Enforcing, Permissive, and Disabled. In Enforcing mode, SELinux actively enforces its policies, meaning that any action that violates the policies will be blocked and logged. This is the mode that provides the highest level of security.

In Permissive mode, SELinux does not enforce policies but does log any violations. This mode is useful for troubleshooting and monitoring how SELinux policies affect the system without actually enforcing restrictions.

When SELinux is Disabled, the security features of SELinux are turned off entirely, which means that no policies are applied, and all access is allowed. This mode may be used for testing or in systems where SELinux is not required, but it presents a significant security risk because it removes a layer of access control.

Understanding these modes is crucial for system administrators managing security policies on a Linux system, as they dictate how SELinux interacts with applications and processes.