You're reading from SELinux System Administration, Third Edition Implement mandatory access control to secure applications, users, and information flows on Linux

Product type Paperback

Published in Dec 2020

Publisher Packt

ISBN-13 9781800201477

Length 458 pages

Edition 3rd Edition

Tools

Docker

Concepts

System Administration

Author (1):

Sven Vermeulen

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Table of Contents (22) Chapters

Preface

1. Section 1: Using SELinux

2. Chapter 1: Fundamental SELinux Concepts FREE CHAPTER

3. Chapter 2: Understanding SELinux Decisions and Logging

4. Chapter 3: Managing User Logins

5. Chapter 4: Using File Contexts and Process Domains

6. Chapter 5: Controlling Network Communications

7. Chapter 6: Configuring SELinux through Infrastructure-as-Code Orchestration

8. Section 2: SELinux-Aware Platforms

9. Chapter 7: Configuring Application-Specific SELinux Controls

10. Chapter 8: SEPostgreSQL – Extending PostgreSQL with SELinux

11. Chapter 9: Secure Virtualization

12. Chapter 10: Using Xen Security Modules with FLASK

13. Chapter 11: Enhancing the Security of Containerized Workloads

14. Section 3: Policy Management

15. Chapter 12: Tuning SELinux Policies

16. Chapter 13: Analyzing Policy Behavior

17. Chapter 14: Dealing with New Applications

18. Chapter 15: Using the Reference Policy

19. Chapter 16: Developing Policies with SELinux CIL

20. Assessments

21. Other Books You May Enjoy

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Handling policy modules

When the system loads the SELinux policy in memory, it uses the policy.## file, with ## representing the policy version, as explained at the end of Chapter 1, Fundamental SELinux Concepts. This file, which resides in /etc/selinux/targeted/policy, is generated every time the policy is modified. This can be when booleans are changed (and persisted), or when SELinux policy modules are added or removed.

Listing policy modules

SELinux policy modules are sets of SELinux rules that can be loaded and unloaded. These modules, with .pp or .cil suffixes, can be loaded and unloaded as needed by the administrator. Once loaded, the policy module is made part of the SELinux policy store, and will be loaded even after a system reboot. Unlike SELinux boolean changes, SELinux policy module loads are always persisted.

To list the currently loaded SELinux policy modules, we recommend using the semodule command. By default, semodule will show all loaded SELinux policy modules...