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SELinux System Administration, Third Edition

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

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Product type Paperback
Published in Dec 2020
Publisher Packt
ISBN-13 9781800201477
Length 458 pages
Edition 3rd Edition
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Author (1):
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Sven Vermeulen Sven Vermeulen
Author Profile Icon Sven Vermeulen
Sven Vermeulen
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Toc

Table of Contents (22) Chapters Close

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

Investigating domain transitions

An important analytical approach when dealing with SELinux policies is to perform a domain transition analysis. Domains are bounded by the access controls in place for a given domain, but users or processes can transition to other domains by executing the right set of applications.

Analyzing whether and how a transition can occur between two SELinux domains allows administrators to validate the secure state of the policy. Given the mandatory nature of SELinux, adversaries will find it difficult to be able to execute target applications if a domain transition analysis shows that the source domain cannot execute said application, either directly or indirectly.

Administrators should use domain transition analysis to confirm a domain is correctly confined, and that vulnerabilities within the applications running inside a domain cannot lead to privilege escalations.

Using apol for domain transition analysis

After starting apol, select New Analysis...

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