RHCSA Red Hat Enterprise Linux 9 Certification Study Guide, Eighth Edition (Exam EX200), 8th Edition

Chapter 8

Linux Security

CERTIFICATION OBJECTIVES

8.01     Basic Firewall Control

8.02     Securing SSH with Key-Based Authentication

8.03     A Security-Enhanced Linux Primer

     Two-Minute Drill

Q&A   Self Test

Linux security has been based on a concept known as discretionary access control (DAC). In the DAC model, access to “objects,” such as file and directories, is discretionary because it is controlled by the owner of the objects. Hence, the standard permissions and ownership associated with files and directories is an implementation of DAC.

Then, the U.S. National Security Agency (NSA) developed SELinux, which is an implementation of ...