References
• http://tldp.org/HOWTO/User-Authentication-HOWTO/—The User-Authentication HOWTO describes how user and group information is stored and used for authentication.
• http://tldp.org/HOWTO/Shadow-Password-HOWTO.html—The Shadow-Password HOWTO delves into the murky depths of shadow passwords and even discusses why you might not want to use them.
• http://tldp.org/HOWTO/Security-HOWTO/—A must-read HOWTO, the Security HOWTO is a good overview of security issues. Especially applicable to this chapter are sections on creating accounts, file permissions, and password security.
• http://tldp.org/LDP/sag/html/index.html—A general guide, the Linux System Administrator’s Security Guide has interesting sections on limiting and monitoring users.
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