1996-01-28 23:49:05 +00:00
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.\" Copyright (c) 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)nologin.8 8.1 (Berkeley) 6/19/93
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1999-08-28 00:22:10 +00:00
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.\" $FreeBSD$
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1996-01-28 23:49:05 +00:00
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.\"
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2007-05-10 11:22:24 +00:00
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.Dd May 10, 2007
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1996-01-28 23:49:05 +00:00
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.Dt NOLOGIN 5
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2001-07-10 11:04:34 +00:00
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.Os
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1996-01-28 23:49:05 +00:00
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.Sh NAME
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.Nm nologin
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.Nd disallow logins
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.Sh DESCRIPTION
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2001-07-15 07:53:42 +00:00
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Programs such as
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2000-11-12 16:29:52 +00:00
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.Xr login 1
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2007-05-10 11:22:24 +00:00
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disallow logins if the
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.Nm
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file exists.
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The programs display the contents of
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.Nm
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to the user if possible and interrupt the login sequence.
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2000-11-12 16:29:52 +00:00
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This makes it simple to temporarily prevent incoming logins systemwide.
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.Pp
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To disable logins on a per-account basis,
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investigate
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.Xr nologin 8 .
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1996-01-28 23:49:05 +00:00
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.Sh SECURITY
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2007-05-10 11:22:24 +00:00
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The
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.Nm
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file is ignored for user root by default.
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.Sh IMPLEMENTATION NOTES
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The
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.Nm
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feature is implemented through
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.Xr login.conf 5 ,
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which allows to change the pathname of the
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file and to extend the list of users
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exempt from temporary login restriction.
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.Pp
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PAM-aware programs can be selectively configured to respect
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.Nm
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using the
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.Xr pam_nologin 8
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module via
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.Xr pam.conf 5 .
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.Pp
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The
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.Nm
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file will be removed at system boot if it resides in
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.Pa /var/run
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and
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.Va cleanvar_enable
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is set to
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.Dq Li YES
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in
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.Xr rc.conf 5 ,
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which is default.
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Therefore system reboot can effectively re-enable logins.
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1996-01-28 23:49:05 +00:00
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.Sh FILES
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2004-06-13 18:03:44 +00:00
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.Bl -tag -width ".Pa /var/run/nologin" -compact
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1999-01-12 14:09:23 +00:00
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.It Pa /var/run/nologin
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2007-05-10 11:22:24 +00:00
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default location of
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.Nm
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1996-01-28 23:49:05 +00:00
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.El
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.Sh SEE ALSO
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.Xr login 1 ,
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2007-05-10 11:22:24 +00:00
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.Xr login.conf 5 ,
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.Xr pam.conf 5 ,
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.Xr rc.conf 5 ,
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1999-02-01 21:00:24 +00:00
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.Xr nologin 8 ,
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2007-05-10 11:22:24 +00:00
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.Xr pam_nologin 8 ,
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1996-01-28 23:49:05 +00:00
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.Xr shutdown 8
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