pam_wheel man page on Archlinux

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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.

       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 for wheel membership will be done against the current uid
	   instead of the original one (useful when jumping with su from one
	   account to another for example).

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@redhat.com>.

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