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

Labeled networking


Another approach to further fine-tune the access controls on the network level is to introduce labeled networking. With labeled networking, security information is passed on between hosts (unlike SECMARK, which only starts when the packet is received by the netfilter subsystem). This is also known as peer labeling, as the security information is passed on between hosts (peers).

The advantage of labeled networking is that security information is retained across the network, allowing an end-to-end enforcement on mandatory access-control settings between systems as well as retaining the sensitivity level of communication flows between systems. The major downside however is that this requires an additional network technology (protocol) that is able to manage labels on network packets or flows.

SELinux currently supports two implementations as part of the labeled networking approach: NetLabel and labeled IPsec. With NetLabel, two implementations exist: fallback labeling and CIPSO...