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SELinux Cookbook

You're reading from  SELinux Cookbook

Product type Book
Published in Sep 2014
Publisher
ISBN-13 9781783989669
Pages 240 pages
Edition 1st Edition
Languages
Author (1):
Sven Vermeulen Sven Vermeulen
Profile icon Sven Vermeulen

Table of Contents (17) Chapters

SELinux Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
1. The SELinux Development Environment 2. Dealing with File Labels 3. Confining Web Applications 4. Creating a Desktop Application Policy 5. Creating a Server Policy 6. Setting Up Separate Roles 7. Choosing the Confinement Level 8. Debugging SELinux 9. Aligning SELinux with DAC 10. Handling SELinux-aware Applications Index

Differentiating policies based on use cases


As services mature, they often gain more features, which might not always be necessary. For instance, daemons that are able to optionally connect to various network resources depending on their configuration should not be allowed by the SELinux policy to always connect to various network resources.

To govern these features, SELinux policy developers include Booleans to selectively toggle policies based on the administrator's requirements.

How to do it…

Booleans allow policy developers to create policy rules that only participate in access control when the administrator has elected to use them. For services in particular, this is often used to optionally allow privileges based on the use case of the service and is implemented as follows:

  1. Identify the policy blocks that should be marked as optional, depending on the configuration. For instance, this could be a set of policy rules that allow PostgreSQL to connect to other PostgreSQL databases:

    corenet_tcp_connect_postgresql_port...
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