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(PAM) for Apache
http://pam.sourceforge.net/mod_auth_pam/
,od_auth_pam.c, the pluggable authentication module for Apache.
Linux-PAM modules
http://www.us.kernel.org/pub/linux/libs/pam/modules.html
Here is a list of the modules that people are using/developing for use with Linux-PAM.
The Linux-PAM Module Writers' Guide
http://www.us.kernel.org/pub/linux/libs/pam/Linux-PAM-html/pam_modules.html
The Linux-PAM Module Writers' Guide
The Linux-PAM System Administrators' Guide
http://www.kernel.org/pub/linux/libs/pam/Linux-PAM-html/pam.html
The Linux-PAM System Administrators' Guide