NAME
dm
- dungeon master
SYNOPSIS
ln
-s dm game
DESCRIPTION
dm
is a program used to regulate game playing.
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
,
in the directory
/usr/games
for all of the regulated games.
The actual binaries for these games should be placed in a
``hidden''
directory,
/usr/games/hide
,
that may only be accessed by the
dm
program.
dm
determines if the requested game is available and, if so, runs it.
The file
/etc/dm.conf
controls the conditions under which games may be run.
The file
/etc/nogames
may be used to
``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.
FILES
/etc/dm.conf
-
configuration file
/etc/nogames
-
turns off game playing
/usr/games/hide
-
directory of ``real'' binaries
/var/log/games.log
-
game logging file
SEE ALSO
dm.conf(5)
HISTORY
The
dm
command appeared in
4.3BSDtahoe.
SECURITY CONSIDERATIONS
Two issues result from
dm
running the games setgid
``games''.
First, all games that allow users to run
UNIX
commands should carefully
set both the real and effective group ids immediately before executing
those commands.
Probably more important is that
dm
never be setgid anything but
``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 setgid and which
accessed user files may have to be modified.