The Linux operating system continues to gain market share, based largely on its reputation as the most secure operating system available. The challenge faced by system administrators is that Linux is secure only if installed and configured properly, constantly and meticulously updated, and carefully integrated with a wide variety of Open Source security tools. Hack Proofing Linux provides the system administrator with coverage of the most popular Linux operating systems and Open Source security tools, along with the techniques necessary to properly configure and maintain Linux systems and to counter malicious attacks. Это и многое другое вы найдете в книге Hack Proofing Linux : A Guide to Open Source Security (James Stanger, Patrick T. Lane)