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

Securing Docker containers


Until now, we've looked at libvirt and full virtualization. But a new type of virtualization has been gaining traction, called containerization--more specifically, Docker containers.

When working with containers, administrators have to be well aware that containers do not virtualize everything: the Linux kernel itself is shared, and all software running inside the container is interacting with the Linux kernel, just like software running outside the container. That does not mean that containers don't isolate, though. They are built based on Linux features such as namespaces and control groups.

Understanding container security

As the Linux kernel is shared, exploits on the kernel level impact the entire host and can compromise not only the container through which an exploit is executed, but also all other containers and software running on the host.

Generally, one could imagine using SELinux to prevent vulnerabilities to be exploited. Policies could be used to ensure...