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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 1

  1. The most important difference is that, with a DAC system, the user has full control over who gets which kind of access to the user's data. It is left to the discretion of the user, hence the name. With MAC systems, the system administrator (or security administrator) defines how accesses are handled and enforced. Access is mandated by a policy, and users cannot work around this if the administrator does not allow it.
  2. Linux has introduced hooks inside its kernel code, which developers can subscribe to with their own code. These hooks are part of the Linux Security Module (LSM) framework, an extensible framework that is natively part of the Linux kernel.

    SELinux is one of the MAC technologies that use this LSM framework (and the hooks it offers) to provide mandatory access control capabilities to the Linux kernel and its applications. Other technologies also exist, including AppArmor.

    The SELinux subsystem code itself is also made part of the main Linux kernel,...

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