DM(8)DM(8)NAMEdm - dungeon master
SYNOPSIS
ln -sdm 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'' con‐
trols 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 ALSOdm(5)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 commands. 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 previ‐
ously had no reason to run setuid and which accessed user files may
have to be modified.
3rd Berkeley Distribution June 26, 1990 DM(8)
