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Linux Firewalls: Attack Detection and Responseby Michael Rash
Synopses & Reviews
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:
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.
Book News Annotation:
A security architect with Enterasys Networks, Rash shows system administrators how the iptables firewall on Linux systems is well positioned to take advantage of the trend in security to combine application layer inspection techniques from the intrusion detection world with the ability to filter network traffic. He focuses on three open source software projects: psad, fwsnort, and fwknop. He does not provide bibliographical references. Annotation ©2007 Book News, Inc., Portland, OR (booknews.com)
The Netfilter firewall built into Linux provides capabilities that rival many commercial firewalls. Providing concrete examples to illustrate concepts, this new reference explores using Netfilter as an intrusion detection system (IDS) by combining it with Snort rule sets and custom software available from the author's site, cipherdyne.org.
Linux firewalls provide capabilities that rival commercial firewalls, and are built upon the powerful Netfilter infrastructure in the Linux kernel. "Linux Firewalls: Attack Detection and Response" explores using Netfilter as an intrusion detection system (IDS) by combining it with Snort rulesets and custom open source software created by the author. Providing concrete examples to illustrate concepts, the book discusses Linux firewall log analysis and policies, passive network authentication and authorization, exploit packet traces and Snort ruleset emulation, and more. Perl and C code snippets are included to help readers maximize the deployment of Linux firewalls as effective mechanisms for the detection and prevention of various network-based attacks.
About the Author
Michael Rash is a Security Architect on the Dragon Intrusion DetectionSystem with Enterasys Networks, Inc., and is a frequent contributor toopen source projects. As the creator of psad, fwknop, and fwsnort, Rashis an expert on firewalls, IDSs, OS fingerprinting, and the Snort ruleslanguage. He is co-author of the book Snort 2.1 Intrusion Detection,lead-author and technical editor of the book Intrusion Prevention andActive Response, and has written security articles for Linux Journal,SysAdmin, and ;login:.
Table of Contents
ACKNOWLEDGMENTSFOREWORDINTRODUCTIONChapter 1: CARE AND FEEDING OF IPTABLESChapter 2: NETWORK LAYER ATTACKS AND DEFENSEChapter 3: TRANSPORT LAYER ATTACKS AND DEFENSEChapter 4: APPLICATION LAYER ATTACKS AND DEFENSEChapter 5: INTRODUCING PSAD: THE PORT SCAN ATTACK DETECTORChapter 6: PSAD OPERATIONS: DETECTING SUSPICIOUS TRAFFICChapter 7: ADVANCED PSAD TOPICS: FROM SIGNATURE MATCHING TO OS FINGERPRINTINGChapter 8: ACTIVE RESPONSE WITH PSADChapter 9: TRANSLATING SNORT RULES INTO IPTABLES RULESChapter 10: DEPLOYING FWSNORTChapter 11: COMBINING PSAD AND FWSNORTChapter 12: PORT KNOCKING VS. SINGLE PACKET AUTHORIZATIONChapter 13: INTRODUCING FWKNOPChapter 14: VISUALIZING IPTABLES LOGSATTACK SPOOFINGA COMPLETE FWSNORT SCRIPTCOLOPHON
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