UNIX Security Essentials
Content Leader: Jess Garcia - Last Updated: May 21, 2007
The best and easiest way to harden a system is to follow the industry best practices. The following references provide guidelines that allow you to easily apply those best practices to your system.
The following free tools can help you harden your UNIX systems:
Bastille allows you to easily lock down several UNIX variants (Linux, OS X, HPUX, etc.).
Security Evaluation & Auditing
Right after you have hardened a system, and periodically thereafter, you will want to verify how secure it is. You can use the following free tools for that purpose:
The Center for Internet Security provides free tools to check the security of many UNIX variants (FreeBSD, Linux, Solaris, AIX, HPUX, OS X, etc.).