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-.\" Copyright (c) 1983, 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. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"	This product includes software developed by the University of
-.\"	California, Berkeley and its contributors.
-.\" 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.
-.\"
-.\"	@(#)3.t	8.1 (Berkeley) 6/8/93
-.\"
-.NH 1
-Access control
-.PP
-The printer system maintains protected spooling areas so that
-users cannot circumvent printer accounting or
-remove files other than their own.
-The strategy used to maintain protected
-spooling areas is as follows:
-.IP \(bu 3
-The spooling area is writable only by a \fIdaemon\fP user
-and \fIdaemon\fP group.
-.IP \(bu 3
-The \fIlpr\fP program runs set-user-id to \fIroot\fP and
-set-group-id to group \fIdaemon\fP.  The \fIroot\fP access permits
-reading any file required. Accessibility is verified
-with an \fIaccess\fP\|(2) call.  The group ID
-is used in setting up proper ownership of files
-in the spooling area for \fIlprm\fP.
-.IP \(bu 3
-Control files in a spooling area are made with \fIdaemon\fP
-ownership and group ownership \fIdaemon\fP.  Their mode is 0660.
-This insures control files are not modified by a user
-and that no user can remove files except through \fIlprm\fP.
-.IP \(bu 3
-The spooling programs,
-\fIlpd\fP, \fIlpq\fP, and \fIlprm\fP run set-user-id to \fIroot\fP
-and set-group-id to group \fIdaemon\fP to access spool files and printers.
-.IP \(bu 3
-The printer server, \fIlpd\fP,
-uses the same verification procedures as \fIrshd\fP\|(8C)
-in authenticating remote clients.  The host on which a client
-resides must be present in the file /etc/hosts.equiv or /etc/hosts.lpd and
-the request message must come from a reserved port number.
-.PP
-In practice, none of \fIlpd\fP, \fIlpq\fP, or
-\fIlprm\fP would have to run as user \fIroot\fP if remote
-spooling were not supported.  In previous incarnations of
-the printer system \fIlpd\fP ran set-user-id to \fIdaemon\fP,
-set-group-id to group \fIspooling\fP, and \fIlpq\fP and \fIlprm\fP ran
-set-group-id to group \fIspooling\fP.