man > pam_rootok(8)

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, account and password module types are provided.

RETURN VALUES
       PAM_SUCCESS
           The UID is 0.

       PAM_AUTH_ERR
           The UID is not 0.

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(7)

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

Linux-PAM                                    05/07/2023                                PAM_ROOTOK(8)