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DM(8)		       DragonFly System Manager's Manual		 DM(8)


dm -- dungeon master


ln -s dm game


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 cre- ating 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.


/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




The dm command appeared in 4.3BSD-Tahoe.


Two problems result from dm running the games setuid ``games''. First, all games that allow users to run UNIX commands should carefully set both the real and effective user id's immediately before executing those com- mands. Probably more important is that dm never be setuid 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 setuid and which accessed user files may have to be modi- fied. DragonFly 5.1 May 31, 1993 DragonFly 5.1

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