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.
4. 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
$FreeBSD: head/usr.sbin/nologin/nologin.5 169439 2007-05-10 11:22:24Z yar $
.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.
p 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.
p PAM-aware programs can be selectively configured to respect .Nm using the .Xr pam_nologin 8 module via .Xr pam.conf 5 .
p The .Nm file will be removed at system boot if it resides in
a /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 l -tag -width ".Pa /var/run/nologin" -compact t 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