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This is the initial commit of the PAM Authentication module. It's functional as far as I need it for.
The PAM Auth module is based vaguely on a skeleton of the IMAP Auth module (http://drupal.org/project/imap_auth). It accomplishes the same goal except that it uses the PHP5-PAM module to accomplish the authentication. It also borrows some ideas from the ldap_integration (http://drupal.org/node/15109) module for password-form adjustments.