NAME
dm —
dungeon master
SYNOPSIS
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 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.