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Pluggable Authentication
Instead of modifying every tool in order to customize access to resources, write PAM modules to customize access.
Examples of services that are PAM enabled include: login, su, telnetd, sshd, xdm, ftpd, pop, httpd (basically anything that provides restricted access to resources).
Some documentation about various PAM modules can be viewed (Linux) at: /usr/share/doc/packages/pam/modules