Linux firewalls

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. 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.

Auteur
Michael Rash is a Security Architect on the Dragon Intrusion Detection System with Enterasys Networks, Inc., and is a frequent contributor to open source projects. As the creator of psad, fwknop, and fwsnort, Rash is an expert on firewalls, IDSs, OS fingerprinting, and the Snort rules language. He is co-author of the book Snort 2.1 Intrusion Detection, lead-author and technical editor of the book Intrusion Prevention and Active Response, and has written security articles for Linux Journal, SysAdmin, and ;login:.

Contenu
Foreword by Richard Bejtlich
Introduction
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