112 lines
3.6 KiB
Groff
112 lines
3.6 KiB
Groff
.\" $NetBSD: dm.8,v 1.6 1998/06/08 12:41:41 lukem Exp $
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.\"
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.\" Copyright (c) 1987, 1991, 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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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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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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.\" @(#)dm.8 8.1 (Berkeley) 5/31/93
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.\"
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.Dd May 31, 1993
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.Dt DM 8
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.Os
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.Sh NAME
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.Nm dm
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.Nd dungeon master
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.Sh SYNOPSIS
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.Nm ln
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.Fl s Cm dm Ar game
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.Sh DESCRIPTION
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.Nm
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is a program used to regulate game playing.
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.Nm
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expects to be invoked with the name of a game that a user wishes to play.
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This is done by creating symbolic links to
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.Nm "" ,
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in the directory
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.Pa /usr/games
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for all of the regulated games.
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The actual binaries for these games should be placed in a
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.Dq hidden
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directory,
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.Pa /usr/games/hide ,
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that may only be accessed by the
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.Nm
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program.
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.Nm
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determines if the requested game is available and, if so, runs it.
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The file
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.Pa /etc/dm.conf
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controls the conditions under which games may
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be run.
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.Pp
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The file
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.Pa /etc/nogames
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may be used to
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.Dq turn off
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game playing.
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If the file exists, no game playing is allowed; the contents of the file
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will be displayed to any user requesting a game.
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.Sh FILES
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.Bl -tag -width /var/log/games.log -compact
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.It Pa /etc/dm.conf
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configuration file
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.It Pa /etc/nogames
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turns off game playing
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.It Pa /usr/games/hide
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directory of ``real'' binaries
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.It Pa /var/log/games.log
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game logging file
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.El
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.Sh SEE ALSO
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.Xr dm.conf 5
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.Sh HISTORY
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The
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.Nm
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command appeared in
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.Bx 4.3 tahoe .
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.Sh SECURITY CONSIDERATIONS
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Two issues result from
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.Nm
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running the games setgid
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.Dq games .
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First, all games that allow users to run
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.Ux
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commands should carefully
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set both the real and effective group id's immediately before executing
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those commands.
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Probably more important is that
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.Nm
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never be setgid anything but
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.Dq games
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so that compromising a game will result only in
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the user's ability to play games at will.
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Secondly, games which previously had no reason to run setgid and which
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accessed user files may have to be modified.
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