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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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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

Chapter 2

  1. Administrators should first analyze the situation to see why a problem is being triggered. Perhaps the problem is due to an incorrectly assigned context, or the process has not been started using the correct methods.

    If the denial itself were to be allowed, administrators should create an update to the SELinux policy (just like they would update firewall rules as required).

    If this is not feasible, then administrators should consider putting SELinux in permissive mode, but only for that particular application that is causing problems.

    If that is also not feasible, then administrators should put the system in permissive mode, but making sure that this is accepted by the organization and security principles of the environment.

    Only if even this is not feasible or solves the problem should an administrator shake their head, curse the higher powers, and disable SELinux.

  2. If the system has the audit daemon running, then SELinux logging will be part of the audit logs. They...
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