sys-libs/system-config-base/files/config-util

#%PAM-1.0
auth		sufficient	pam_rootok.so
auth		sufficient	pam_timestamp.so
auth		include		system-auth
account		required	pam_permit.so
session		required	pam_permit.so
session		optional	pam_xauth.so
session		optional	pam_timestamp.so