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

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

Chapter 4

The most common option is -Z, and is supported by tools such as ls, mv, and ps. The same character is also used by systemd's tmpfiles application to explicitly set SELinux contexts on resources. However, while this is the most commonly used option, not all tools follow this convention, so we recommend to always consult the tool's help or manual page.
In most cases, the context is stored as an extended attribute of the file or directory within the filesystem. This extended attribute is the security.selinux attribute, and can be queried with tools such as getfattr or stat.
However, not all filesystems support extended attributes. In that case, the SELinux context is obtained through the mount options of that filesystem, and all resources on the filesystem then use the same context.
The chcon application directly alters the SELinux context for a file, but does not adjust the system's file context definitions. If, at any point in time, the system or...