Book Image

Red Hat Enterprise Linux Server Cookbook

By : Jakub Gaj, Leemans
5 (1)
Book Image

Red Hat Enterprise Linux Server Cookbook

5 (1)
By: Jakub Gaj, Leemans

Overview of this book

Dominating the server market, the Red Hat Enterprise Linux operating system gives you the support you need to modernize your infrastructure and boost your organization’s efficiency. Combining both stability and flexibility, RHEL helps you meet the challenges of today and adapt to the demands of tomorrow. This practical Cookbook guide will help you get to grips with RHEL 7 Server and automating its installation. Designed to provide targeted assistance through hands-on recipe guidance, it will introduce you to everything you need to know about KVM guests and deploying multiple standardized RHEL systems effortlessly. Get practical reference advice that will make complex networks setups look like child’s play, and dive into in-depth coverage of configuring a RHEL system. Also including full recipe coverage of how to set up, configuring, and troubleshoot SELinux, you’ll also discover how secure your operating system, as well as how to monitor it.
Table of Contents (12 chapters)
11
Index

Changing file contexts


Files and processes are labeled with a SELinux context, which contains additional information about a SELinux user, role type, and level. This information is provided by the SELinux kernel module to make access control decisions.

The SELinux user, a unique identity known by the SELinux policy, is authorized for a number of roles.

SELinux roles, as we already alluded to before, are attributes of SELinux users and part of the RBAC SELinux policy. SELinux roles are authorized for SELinux domains.

SELinux types define the type for files and domain for processes. SELinux policies define access between types and other files and processes. By default, if there is no specific rule in the SELinux policy, access is denied.

The SELinux level is only used when the SELinux type is set to MLS and should be avoided altogether on anything other than servers. This set of policies doesn't cover the same domains as defined by the default Red Hat SELinux policy. The SELinux level is an attribute...