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+.\"     Title: pam_wheel
+.\"    Author: 
+.\" Generator: DocBook XSL Stylesheets v1.73.1 <http://docbook.sf.net/>
+.\"      Date: 04/16/2008
+.\"    Manual: Linux-PAM Manual
+.\"    Source: Linux-PAM Manual
+.\"
+.TH "PAM_WHEEL" "8" "04/16/2008" "Linux-PAM Manual" "Linux\-PAM Manual"
+.\" disable hyphenation
+.nh
+.\" disable justification (adjust text to left margin only)
+.ad l
+.SH "NAME"
+pam_wheel - Only permit root access to members of group wheel
+.SH "SYNOPSIS"
+.HP 13
+\fBpam_wheel\.so\fR [debug] [deny] [group=\fIname\fR] [root_only] [trust] [use_uid]
+.SH "DESCRIPTION"
+.PP
+The pam_wheel PAM module is used to enforce the so\-called
+\fIwheel\fR
+group\. By default it permits root access to the system if the applicant user is a member of the
+\fIwheel\fR
+group\. If no group with this name exist, the module is using the group with the group\-ID
+\fB0\fR\.
+.SH "OPTIONS"
+.PP
+\fBdebug\fR
+.RS 4
+Print debug information\.
+.RE
+.PP
+\fBdeny\fR
+.RS 4
+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
+\fBgroup\fR
+option), deny access\. Conversely, if the user is not in the group, return PAM_IGNORE (unless
+\fBtrust\fR
+was also specified, in which case we return PAM_SUCCESS)\.
+.RE
+.PP
+\fBgroup=\fR\fB\fIname\fR\fR
+.RS 4
+Instead of checking the wheel or GID 0 groups, use the
+\fB\fIname\fR\fR
+group to perform the authentication\.
+.RE
+.PP
+\fBroot_only\fR
+.RS 4
+The check for wheel membership is done only\.
+.RE
+.PP
+\fBtrust\fR
+.RS 4
+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)\.
+.RE
+.PP
+\fBuse_uid\fR
+.RS 4
+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)\.
+.RE
+.SH "MODULE SERVICES PROVIDED"
+.PP
+The
+\fBauth\fR
+and
+\fBaccount\fR
+services are supported\.
+.SH "RETURN VALUES"
+.PP
+PAM_AUTH_ERR
+.RS 4
+Authentication failure\.
+.RE
+.PP
+PAM_BUF_ERR
+.RS 4
+Memory buffer error\.
+.RE
+.PP
+PAM_IGNORE
+.RS 4
+The return value should be ignored by PAM dispatch\.
+.RE
+.PP
+PAM_PERM_DENY
+.RS 4
+Permission denied\.
+.RE
+.PP
+PAM_SERVICE_ERR
+.RS 4
+Cannot determine the user name\.
+.RE
+.PP
+PAM_SUCCESS
+.RS 4
+Success\.
+.RE
+.PP
+PAM_USER_UNKNOWN
+.RS 4
+User not known\.
+.RE
+.SH "EXAMPLES"
+.PP
+The root account gains access by default (rootok), only wheel members can become root (wheel) but Unix authenticate non\-root applicants\.
+.sp
+.RS 4
+.nf
+su      auth     sufficient     pam_rootok\.so
+su      auth     required       pam_wheel\.so
+su      auth     required       pam_unix\.so
+      
+.fi
+.RE
+.sp
+.SH "SEE ALSO"
+.PP
+
+\fBpam.conf\fR(5),
+\fBpam.d\fR(8),
+\fBpam\fR(8)
+.SH "AUTHOR"
+.PP
+pam_wheel was written by Cristian Gafton <gafton@redhat\.com>\.