centos man page for pam_rootok

PAM_ROOTOK(8)							 Linux-PAM Manual						     PAM_ROOTOK(8)

NAME
       pam_rootok - Gain only root access

SYNOPSIS
       pam_rootok.so [debug]

DESCRIPTION
       pam_rootok is a PAM module that authenticates the user if their UID is 0. Applications that are created setuid-root generally retain the
       UID of the user but run with the authority of an enhanced effective-UID. It is the real UID that is checked.

OPTIONS
       debug
	   Print debug information.

MODULE TYPES PROVIDED
       The auth, acct and password module types are provided.

RETURN VALUES
       PAM_SUCCESS
	   The UID is 0.

       PAM_AUTH_ERR
	   The UID is not0.

EXAMPLES
       In the case of the su(1) application the historical usage is to permit the superuser to adopt the identity of a lesser user without the use
       of a password. To obtain this behavior with PAM the following pair of lines are needed for the corresponding entry in the /etc/pam.d/su
       configuration file:

	   # su authentication. Root is granted access by default.
	   auth  sufficient   pam_rootok.so
	   auth  required     pam_unix.so

SEE ALSO
       su(1), pam.conf(5), pam.d(5), pam(8)

AUTHOR
       pam_rootok was written by Andrew G. Morgan, <morgan@kernel.org>.

Linux-PAM Manual						    09/19/2013							     PAM_ROOTOK(8)