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NetBSD 6.1.5 - man page for dm (netbsd section 8)

DM(8)				   BSD 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 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
     dm.conf(5)

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 imme-
     diately 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.

BSD					   May 31, 1993 				      BSD


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