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PAM_WHEEL(8)                   Linux-PAM Manual                   PAM_WHEEL(8)
NAME
       pam_wheel - Only permit root access to members of group wheel
SYNOPSIS
       pam_wheel.so [debug] [deny] [group=name] [root_only] [trust] [use_uid]
DESCRIPTION
       The pam_wheel PAM module is used to enforce the so-called wheel group.
       By default it permits root access to the system if the applicant user
       is a member of the wheel group. If no group with this name exist, the
       module is using the group with the group-ID 0.
OPTIONS
       debug
           Print debug information.
       deny
           Reverse the sense of the auth operation: if the user is trying to
           get UID 0 access and is a member of the wheel group (or the group
           of the group option), deny access. Conversely, if the user is not
           in the group, return PAM_IGNORE (unless trust was also specified,
           in which case we return PAM_SUCCESS).
       group=name
           Instead of checking the wheel or GID 0 groups, use the name group
           to perform the authentication.
       root_only
           The check for wheel membership is done only when the target user
           UID is 0.
       trust
           The pam_wheel module will return PAM_SUCCESS instead of PAM_IGNORE
           if the user is a member of the wheel group (thus with a little play
           stacking the modules the wheel members may be able to su to root
           without being prompted for a passwd).
       use_uid
           The check will be done against the real uid of the calling process,
           instead of trying to obtain the user from the login session
           associated with the terminal in use.
MODULE TYPES PROVIDED
       The auth and account module types are provided.
RETURN VALUES
       PAM_AUTH_ERR
           Authentication failure.
       PAM_BUF_ERR
           Memory buffer error.
       PAM_IGNORE
           The return value should be ignored by PAM dispatch.
       PAM_PERM_DENY
           Permission denied.
       PAM_SERVICE_ERR
           Cannot determine the user name.
       PAM_SUCCESS
           Success.
       PAM_USER_UNKNOWN
           User not known.
EXAMPLES
       The root account gains access by default (rootok), only wheel members
       can become root (wheel) but Unix authenticate non-root applicants.
           su      auth     sufficient     pam_rootok.so
           su      auth     required       pam_wheel.so
           su      auth     required       pam_unix.so
SEE ALSO
       pam.conf(5), pam.d(5), pam(8)
AUTHOR
       pam_wheel was written by Cristian Gafton <gafton AT redhat.com>.
Linux-PAM Manual                  11/26/2024                      PAM_WHEEL(8)