96 lines
2.8 KiB
Groff
96 lines
2.8 KiB
Groff
.\" Copyright (c) 1993
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" @(#)nologin.8 8.1 (Berkeley) 6/19/93
|
|
.\"
|
|
.Dd May 10, 2007
|
|
.Dt NOLOGIN 5
|
|
.Os
|
|
.Sh NAME
|
|
.Nm nologin
|
|
.Nd disallow logins
|
|
.Sh DESCRIPTION
|
|
Programs such as
|
|
.Xr login 1
|
|
disallow logins if the
|
|
.Nm
|
|
file exists.
|
|
The programs display the contents of
|
|
.Nm
|
|
to the user if possible and interrupt the login sequence.
|
|
This makes it simple to temporarily prevent incoming logins systemwide.
|
|
.Pp
|
|
To disable logins on a per-account basis,
|
|
investigate
|
|
.Xr nologin 8 .
|
|
.Sh SECURITY
|
|
The
|
|
.Nm
|
|
file is ignored for user root by default.
|
|
.Sh IMPLEMENTATION NOTES
|
|
The
|
|
.Nm
|
|
feature is implemented through
|
|
.Xr login.conf 5 ,
|
|
which allows to change the pathname of the
|
|
file and to extend the list of users
|
|
exempt from temporary login restriction.
|
|
.Pp
|
|
PAM-aware programs can be selectively configured to respect
|
|
.Nm
|
|
using the
|
|
.Xr pam_nologin 8
|
|
module via
|
|
.Xr pam.conf 5 .
|
|
.Pp
|
|
The
|
|
.Nm
|
|
file will be removed at system boot if it resides in
|
|
.Pa /var/run
|
|
and
|
|
.Va cleanvar_enable
|
|
is set to
|
|
.Dq Li YES
|
|
in
|
|
.Xr rc.conf 5 ,
|
|
which is default.
|
|
Therefore system reboot can effectively re-enable logins.
|
|
.Sh FILES
|
|
.Bl -tag -width ".Pa /var/run/nologin" -compact
|
|
.It Pa /var/run/nologin
|
|
default location of
|
|
.Nm
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr login 1 ,
|
|
.Xr login.conf 5 ,
|
|
.Xr pam.conf 5 ,
|
|
.Xr rc.conf 5 ,
|
|
.Xr nologin 8 ,
|
|
.Xr pam_nologin 8 ,
|
|
.Xr shutdown 8
|