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Diffstat (limited to 'usr.sbin/nologin/nologin.5')
-rw-r--r-- | usr.sbin/nologin/nologin.5 | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/usr.sbin/nologin/nologin.5 b/usr.sbin/nologin/nologin.5 new file mode 100644 index 0000000..f8a21be --- /dev/null +++ b/usr.sbin/nologin/nologin.5 @@ -0,0 +1,96 @@ +.\" 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. +.\" 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 +.\" $FreeBSD$ +.\" +.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 |