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
dm, 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
HISTORY
The dm command appeared in
4.3BSD-Tahoe.
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.