Book Image

SELinux System Administration. - Second Edition

Book Image

SELinux System Administration. - Second Edition

Overview of this book

Do you have the crucial job of protecting your private and company systems from malicious attacks and undefined application behavior? Are you looking to secure your Linux systems with improved access controls? Look no further, intrepid administrator! This book will show you how to enhance your system’s secure state across Linux distributions, helping you keep application vulnerabilities at bay. This book covers the core SELinux concepts and shows you how to leverage SELinux to improve the protection measures of a Linux system. You will learn the SELinux fundamentals and all of SELinux’s configuration handles including conditional policies, constraints, policy types, and audit capabilities. These topics are paired with genuine examples of situations and issues you may come across as an administrator. In addition, you will learn how to further harden the virtualization offering of both libvirt (sVirt) and Docker through SELinux. By the end of the book you will know how SELinux works and how you can tune it to meet your needs.
Table of Contents (16 chapters)
SELinux System Administration - Second Edition
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface

Summary


In this chapter, we looked at various methods for analyzing SELinux policies.

We started with single-step analysis, using the sesearch and seinfo tools that we've already used throughout the book. In it, we discovered that those tools have a lot of information to offer to administrators who want to analyze the active SELinux policy.

Next, we used the apol, sedta, and seinfoflow tools to perform more in-depth analysis of the SELinux policy. These tools offered us insight into domain transitions (which domains are reachable from other domains) and information flow analysis (which information can eventually--given the right actions and perhaps vulnerabilities in the software--be made available without SELinux preventing the flows).

We ended the chapter with a few other analytical utilities. One of these was the use of the sediff command, which displays the differences between two policy files, allowing administrators to ascertain whether an active policy on one system resembles another...