Linux Security Cookbook

Security Tools & Techniques

By: Daniel J. Barrett, Richard E. Silverman, Robert G. Byrnes

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eText | 2 June 2003 | Edition Number 1

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356 Pages

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Computer security is an ongoing process, a relentless contest between system administrators and intruders. A good administrator needs to stay one step ahead of any adversaries, which often involves a continuing process of education. If you're grounded in the basics of security, however, you won't necessarily want a complete treatise on the subject each time you pick up a book. Sometimes you want to get straight to the point. That's exactly what the new Linux Security Cookbook does. Rather than provide a total security solution for Linux computers, the authors present a series of easy-to-follow recipes--short, focused pieces of code that administrators can use to improve security and perform common tasks securely.

The Linux Security Cookbook includes real solutions to a wide range of targeted problems, such as sending encrypted email within Emacs, restricting access to network services at particular times of day, firewalling a webserver, preventing IP spoofing, setting up key-based SSH authentication, and much more. With over 150 ready-to-use scripts and configuration files, this unique book helps administrators secure their systems without having to look up specific syntax. The book begins with recipes devised to establish a secure system, then moves on to secure day-to-day practices, and concludes with techniques to help your system stay secure.

Some of the "recipes" you'll find in this book are:

Controlling access to your system from firewalls down to individual services, using iptables, ipchains, xinetd, inetd, and more
Monitoring your network with tcpdump, dsniff, netstat, and other tools
Protecting network connections with Secure Shell (SSH) and stunnel
Safeguarding email sessions with Secure Sockets Layer (SSL)
Encrypting files and email messages with GnuPG
Probing your own security with password crackers, nmap, and handy scripts

This cookbook's proven techniques are derived from hard-won experience. Whether you're responsible for security on a home Linux system or for a large corporation, or somewhere in between, you'll find valuable, to-the-point, practical recipes for dealing with everyday security issues. This book is a system saver.