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Pluggable Authentication Modules
This article describes the underlying principles and mechanisms of the Pluggable Authentication Modules (PAM) library, and explains how to configure PAM, how to integrate PAM into applications, and how to write PAM modules.
<year>2001</year> <year>2002</year> <year>2003</year> <holder>Networks Associates Technology, Inc.</holder>
<personname> <firstname>Dag-Erling</firstname> <surname>Smørgrav</surname> </personname> <contrib>Contributed by </contrib>
This article was written for the FreeBSD Project by ThinkSec AS and Network Associates Laboratories, the Security Research Division of Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 (<quote>CBOSS</quote>), as part of the DARPA CHATS research program.
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$FreeBSD: head/en_US.ISO8859-1/articles/pam/article.xml 54299 2020-06-27 18:15:55Z carlavilla $
The Pluggable Authentication Modules (PAM) library is a generalized API for authentication-related services which allows a system administrator to add new authentication methods simply by installing new PAM modules, and to modify authentication policies by editing configuration files.
PAM was defined and developed in 1995 by Vipin Samar and Charlie Lai of Sun Microsystems, and has not changed much since. In 1997, the Open Group published the X/Open Single Sign-on (XSSO) preliminary specification, which standardized the PAM API and added extensions for single (or rather integrated) sign-on. At the time of this writing, this specification has not yet been adopted as a standard.
Although this article focuses primarily on FreeBSD 5.x, which uses OpenPAM, it should be equally applicable to FreeBSD 4.x, which uses Linux-PAM, and other operating systems such as Linux and <trademark>Solaris</trademark>.
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