Locking Down Linux - An Introduction to Linux Security

Regrettably, as it ships, Linux is not particularly secure. It runs or offers many more network services than it needs to, and it has many of those services running in a mode where they will give service to any user. The most important part of Linux security, then, is locking down your services, since most attacks come over the network. This book covers how to secure your server against attack, junk mail, and infiltration. It does not cover how to perform these sorts of attacks. It covers firewalls, and various techniques to lock down individual services, including the powerful command line.