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

Single-step analysis


In the previous chapters, we covered a few methods of analyzing SELinux policies through command-line utilities such as seinfo and sesearch. These utilities are able to assist users in performing single-step analysis: they either provide immediate information about a SELinux object (which is mainly what seinfo is about) or are capable of querying direct SELinux rules (which is the scope of sesearch).

Note

These utilities are provided through the setools package. This package has recently received an overhaul with the release of setools version 4, but at the time of writing this, it has not been included yet by RHEL. It offers new capabilities but also a slightly adjusted output. Throughout this chapter, the displayed outputs will not be accompanied with a warning that the output might be different from system to system.

Not all capabilities of the seinfo and sesearch utilities have been discussed yet though. The next few subsections will go a bit deeper into how these utilities...