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DM(8)                   OpenBSD 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 actual binaries
     /var/log/games.log  game logging file (if logging was compiled in)

SEE ALSO
     dm.conf(5)

HISTORY
     The dm command appeared in 4.3BSD-Tahoe.

SECURITY CONSIDERATIONS
     Some issues arise from dm running the games setgid ``games''. All games
     that allow users to run UNIX commands should carefully set both the real
     and effective group id's before executing those commands.  Probably more
     important is that dm never be setgid anything but ``games'' so that com-
     promising a game will result only in the user's ability to play games at
     will.  Also, games which previously had no reason to run setgid and which
     accessed user files may have to be modified.

OpenBSD 3.0                      May 31, 1993                                1