.\"     Title: pam_nologin
.\"    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_NOLOGIN" "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_nologin - Prevent non-root users from login
.SH "SYNOPSIS"
.HP 15
\fBpam_nologin\.so\fR [file=\fI/path/nologin\fR] [successok]
.SH "DESCRIPTION"
.PP
pam_nologin is a PAM module that prevents users from logging into the system when
\fI/etc/nologin\fR
exists\. The contents of the
\fI/etc/nologin\fR
file are displayed to the user\. The pam_nologin module has no effect on the root user\'s ability to log in\.
.SH "OPTIONS"
.PP
\fBfile=\fR\fB\fI/path/nologin\fR\fR
.RS 4
Use this file instead the default
\fI/etc/nologin\fR\.
.RE
.PP
\fBsuccessok\fR
.RS 4
Return PAM_SUCCESS if no file exists, the default is PAM_IGNORE\.
.RE
.SH "MODULE SERVICES PROVIDED"
.PP
The
\fBauth\fR
and
\fBacct\fR
services are supported\.
.SH "RETURN VALUES"
.PP
PAM_AUTH_ERR
.RS 4
The user is not root and
\fI/etc/nologin\fR
exists, so the user is not permitted to log in\.
.RE
.PP
PAM_BUF_ERR
.RS 4
Memory buffer error\.
.RE
.PP
PAM_IGNORE
.RS 4
This is the default return value\.
.RE
.PP
PAM_SUCCESS
.RS 4
Success: either the user is root or the
\fI/etc/nologin\fR
file does not exist\.
.RE
.PP
PAM_USER_UNKNOWN
.RS 4
User not known to the underlying authentication module\.
.RE
.SH "EXAMPLES"
.PP
The suggested usage for
\fI/etc/pam\.d/login\fR
is:
.sp
.RS 4
.nf
auth  required  pam_nologin\.so
      
.fi
.RE
.sp
.SH "NOTES"
.PP
In order to make this module effective, all login methods should be secured by it\. It should be used as a
\fIrequired\fR
method listed before any
\fIsufficient\fR
methods in order to get standard Unix nologin semantics\. Note, the use of
\fBsuccessok\fR
module argument causes the module to return
\fIPAM_SUCCESS\fR
and as such would break such a configuration \- failing
\fIsufficient\fR
modules would lead to a successful login because the nologin module
\fIsucceeded\fR\.
.SH "SEE ALSO"
.PP

\fBnologin\fR(5),
\fBpam.conf\fR(5),
\fBpam.d\fR(8),
\fBpam\fR(8)
.SH "AUTHOR"
.PP
pam_nologin was written by Michael K\. Johnson <johnsonm@redhat\.com>\.