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@kernel.org>.