[unix-history] / usr / othersrc / games / dm / dm.8

.\" Copyright (c) 1987, 1991 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.
.\"
.\"     @(#)dm.8	5.11 (Berkeley) 7/23/91
.\"
.Dd July 23, 1991
.Dt DM 8
.Os
.Sh NAME
.Nm dm
.Nd dungeon master
.Sh SYNOPSIS
.Nm ln
.Fl s Cm dm Ar game
.Sh DESCRIPTION
.Nm Dm
is a program used to regulate game playing.
.Nm Dm
expects to be invoked with the name of a game that a user wishes to play.
This is done by creating symbolic links to
.Nm dm ,
in the directory
.Pa /usr/games
for all of the regulated games.
The actual binaries for these games should be placed in a
.Dq hidden
directory,
.Pa /usr/games/hide ,
that may only be accessed by the
.Nm dm
program.
.Nm Dm
determines if the requested game is available and, if so, runs it.
The file
.Pa /etc/dm.conf
controls the conditions under which games may
be run.
.Pp
The file
.Pa /etc/nogames
may be used to
.Dq turn off
game playing.
If the file exists, no game playing is allowed; the contents of the file
will be displayed to any user requesting a game.
.Sh FILES
.Bl -tag -width /var/log/games.log -compact
.It Pa /etc/dm.conf
configuration file
.It Pa /etc/nogames
turns off game playing
.It Pa /usr/games/hide
directory of ``real'' binaries
.It Pa /var/log/games.log
game logging file
.El
.Sh SEE ALSO
.Xr dm.conf 5
.Sh BUGS
Two problems result from
.Nm dm
running the games setuid
.Dq games .
First, all games that allow users to run
.Tn UNIX
commands should carefully
set both the real and effective user id's immediately before executing
those commands.  Probably more important is that
.Nm dm
never be setuid
anything but
.Dq games
so that compromising a game will result only in
the user's ability to play games at will.  Secondly, games which previously
had no reason to run setuid and which accessed user files may have to
be modified.
.Sh HISTORY
The
.Nm dm
command appeared in
.Bx 4.3 tahoe .
Commit	Line	Data
7b089094 WJ	1	.\" Copyright (c) 1987, 1991 Regents of the University of California.
	2	.\" All rights reserved.
	3	.\"
	4	.\" Redistribution and use in source and binary forms, with or without
	5	.\" modification, are permitted provided that the following conditions
	6	.\" are met:
	7	.\" 1. Redistributions of source code must retain the above copyright
	8	.\" notice, this list of conditions and the following disclaimer.
	9	.\" 2. Redistributions in binary form must reproduce the above copyright
	10	.\" notice, this list of conditions and the following disclaimer in the
	11	.\" documentation and/or other materials provided with the distribution.
	12	.\" 3. All advertising materials mentioning features or use of this software
	13	.\" must display the following acknowledgement:
	14	.\" This product includes software developed by the University of
	15	.\" California, Berkeley and its contributors.
	16	.\" 4. Neither the name of the University nor the names of its contributors
	17	.\" may be used to endorse or promote products derived from this software
	18	.\" without specific prior written permission.
	19	.\"
	20	.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	21	.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	22	.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	23	.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	24	.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	25	.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	26	.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	27	.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	28	.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	29	.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	30	.\" SUCH DAMAGE.
	31	.\"
	32	.\" @(#)dm.8 5.11 (Berkeley) 7/23/91
	33	.\"
	34	.Dd July 23, 1991
	35	.Dt DM 8
	36	.Os
	37	.Sh NAME
	38	.Nm dm
	39	.Nd dungeon master
	40	.Sh SYNOPSIS
	41	.Nm ln
	42	.Fl s Cm dm Ar game
	43	.Sh DESCRIPTION
	44	.Nm Dm
	45	is a program used to regulate game playing.
	46	.Nm Dm
	47	expects to be invoked with the name of a game that a user wishes to play.
	48	This is done by creating symbolic links to
	49	.Nm dm ,
	50	in the directory
	51	.Pa /usr/games
	52	for all of the regulated games.
	53	The actual binaries for these games should be placed in a
	54	.Dq hidden
	55	directory,
	56	.Pa /usr/games/hide ,
	57	that may only be accessed by the
	58	.Nm dm
	59	program.
	60	.Nm Dm
	61	determines if the requested game is available and, if so, runs it.
	62	The file
	63	.Pa /etc/dm.conf
	64	controls the conditions under which games may
65	be run.
66	.Pp
67	The file
68	.Pa /etc/nogames
69	may be used to
70	.Dq turn off
71	game playing.
72	If the file exists, no game playing is allowed; the contents of the file
73	will be displayed to any user requesting a game.
74	.Sh FILES
75	.Bl -tag -width /var/log/games.log -compact
76	.It Pa /etc/dm.conf
77	configuration file
78	.It Pa /etc/nogames
79	turns off game playing
80	.It Pa /usr/games/hide
81	directory of ``real'' binaries
82	.It Pa /var/log/games.log
83	game logging file
84	.El
85	.Sh SEE ALSO
86	.Xr dm.conf 5
87	.Sh BUGS
88	Two problems result from
89	.Nm dm
90	running the games setuid
91	.Dq games .
92	First, all games that allow users to run
93	.Tn UNIX
94	commands should carefully
95	set both the real and effective user id's immediately before executing
96	those commands. Probably more important is that
97	.Nm dm
98	never be setuid
99	anything but
100	.Dq games
101	so that compromising a game will result only in
102	the user's ability to play games at will. Secondly, games which previously
103	had no reason to run setuid and which accessed user files may have to
104	be modified.
105	.Sh HISTORY
106	The
107	.Nm dm
108	command appeared in
109	.Bx 4.3 tahoe .