Which SELinux function allows for the control of access between users, files, and network resources?

The correct answer is the MAC policy, as it is the fundamental concept underlying SELinux (Security-Enhanced Linux) that provides mandatory access control mechanisms. In the context of SELinux, MAC policy governs how access controls are enforced between users, files, and network resources. It establishes a set of rules that define what actions users can perform on various resources based on the security context assigned to those users and resources.

Unlike other options, the MAC policy is specifically designed to ensure that access is granted or denied based on predefined security rules rather than user preferences or administrative settings. This makes it a robust security feature, as it operates independently of traditional discretionary access controls, which are typically based on user ownership or permissions.

In contrast, the targeted feature of SELinux creates a specific security policy focusing on a subset of processes and resources, while the permissive mode allows all access but logs policy violations without enforcing them. The setenforce command is used to switch SELinux between enforcing and permissive modes but does not define the rules themselves. Thus, the MAC policy is the core function that facilitates the comprehensive control of access within the SELinux framework.