Linux Security: Craig Hunt Linux Library

Authoritative Answers to All Your Linux Security Questions—Specifically for Linux Administrators
This is the most complete, most advanced guide to Linux security you'll find anywhere. Written by a Linux security expert with over a decade of experience, Linux Security teaches you, step-by-step, all the standard and advanced techniques you need to know to keep your Linux environment safe from threats of all kinds. Hundreds of clear, consistent examples illustrate these techniques in detail†so you stay on track and accomplish all your goals. Coverage includes:
- Understanding information and system security procedures
- Developing a corporate security policy
- Designing and deploying an effective system and network monitoring strategy
- Managing the network services offered by Linux servers
- Understanding Sendmail security, including authentication and privacy
- Providing application-level mail security using PGP
- Designing and deploying an Apache HTTP server, including SSL extensions
- Securing your Samba server
- Building a network layer firewall using IPtables and Linux kernel v.2.4
- Using the NEC SOCKS5 transport layer firewall
- Deploying the TIS firewall toolkit
- Offering secure remote connectivity with IPsec and PPTP VPNs
- Adding strong user authentication to Linux servers using Kerberos
- Understanding the Linux Pluggable Authentication Modules (PAM)