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'\" t
.\" Title: pam_rootok
.\" Author: [see the "AUTHOR" section]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\" Date: 06/08/2020
.\" Manual: Linux-PAM Manual
.\" Source: Linux-PAM Manual
.\" Language: English
.\"
.TH "PAM_ROOTOK" "8" "06/08/2020" "Linux-PAM Manual" "Linux\-PAM Manual"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el .ds Aq '
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
pam_rootok \- Gain only root access
.SH "SYNOPSIS"
.HP \w'\fBpam_rootok\&.so\fR\ 'u
\fBpam_rootok\&.so\fR [debug]
.SH "DESCRIPTION"
.PP
pam_rootok is a PAM module that authenticates the user if their
\fIUID\fR
is
\fI0\fR\&. Applications that are created setuid\-root generally retain the
\fIUID\fR
of the user but run with the authority of an enhanced effective\-UID\&. It is the real
\fIUID\fR
that is checked\&.
.SH "OPTIONS"
.PP
\fBdebug\fR
.RS 4
Print debug information\&.
.RE
.SH "MODULE TYPES PROVIDED"
.PP
The
\fBauth\fR,
\fBaccount\fR
and
\fBpassword\fR
module types are provided\&.
.SH "RETURN VALUES"
.PP
PAM_SUCCESS
.RS 4
The
\fIUID\fR
is
\fI0\fR\&.
.RE
.PP
PAM_AUTH_ERR
.RS 4
The
\fIUID\fR
is
\fBnot\fR
\fI0\fR\&.
.RE
.SH "EXAMPLES"
.PP
In the case of the
\fBsu\fR(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:
.sp
.if n \{\
.RS 4
.\}
.nf
# su authentication\&. Root is granted access by default\&.
auth sufficient pam_rootok\&.so
auth required pam_unix\&.so
.fi
.if n \{\
.RE
.\}
.sp
.SH "SEE ALSO"
.PP
\fBsu\fR(1),
\fBpam.conf\fR(5),
\fBpam.d\fR(5),
\fBpam\fR(8)
.SH "AUTHOR"
.PP
pam_rootok was written by Andrew G\&. Morgan, <morgan@kernel\&.org>\&.
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