pam-script allows you to execute scripts during
authorization, passwd changes, and on session
opening or closing. Such scripts can perform
necessary tasks or influence the outcome of the
PAM stack. For example, if the entry "sshd auth
required pam_script" was included in pam.conf, and
if the pam_script_auth script exits with a
non-zero value, this would cause the user to be
denied SSH access to the machine.
