Book Description
System administrators need to stay ahead of new security vulnerabilities that leave their networks exposed every day. A firewall and an intrusion detection systems (IDS) are two important weapons in that fight, enabling you to proactively deny access and monitor network traffic for signs of an attack.
Linux Firewalls discusses the technical details of the iptables firewall and the Netfilter framework that are built into the Linux kernel,
and it explains how they provide strong filtering, Network Address
Translation (NAT), state tracking, and application layer inspection
capabilities that rival many commercial tools. You’ll learn how to
deploy iptables as an IDS with psad and fwsnort and how to build a strong, passive authentication layer around iptables with fwknop.
Concrete examples illustrate concepts such as firewall log analysis
and policies, passive network authentication and authorization, exploit
packet traces, Snort ruleset emulation, and more with coverage of these
topics:
Passive network authentication and OS fingerprinting
iptables log analysis and policies
Application layer attack detection with the iptables string match extension
Building an iptables ruleset that emulates a Snort ruleset
Port knocking vs. Single Packet Authorization (SPA)
Tools for visualizing iptables logs
Perl
and C code snippets offer practical examples that will help you to
maximize your deployment of Linux firewalls. If you’re responsible for
keeping a network secure, you’ll find Linux Firewalls
invaluable in your attempt to understand attacks and use iptables—along
with psad and fwsnort—to detect and even prevent compromises.
Visit the book’s companion site for supporting files, downloads, errata, and more.
Table of Contents
Chapter 1. Care and Feeding of iptables
Chapter 2. Network Layer Attacks and Defense
Chapter 3. Transport Layer Attacks and Defense
Chapter 4. Application Layer Attacks and Defense
Chapter 5. Introducing psad. The Port Scan Attack Detector
Chapter 6. psad Operations. Detecting Suspicious Traffic
Chapter 7. Advanced psad Topics. From Signature Matching to OS Fingerprinting
Chapter 8. Active Response with psad
Chapter 9. Translating Snort Rules into iptables Rules
Chapter 10. Deploying Fwsnort
Chapter 11. Combining psad and Fwsnort
Chapter 12. Port-Knocking vs. Single Packet Authorization
Chapter 13. Introducing fwknop
Chapter 14. Visualizing iptables Logs
Appendix A. Attack Spoofing
Appendix B. A Complete fwsnort Script
Appendix B. A Complete fwsnort Script
Book Details
Paperback: 336 pages
Publisher: No Starch Press (September 2007)
Language: English
ISBN-10: 1593271417
ISBN-13: 978-1593271411