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


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 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.


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 4.3BSD-Tahoe.


BUGS

     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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