DM(8) | System Manager's Manual | DM(8) |
dm
— dungeon
master
ln |
-s dm
game |
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.
The dm
command appeared in
4.3BSD-Tahoe.
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.
May 31, 1993 | NetBSD 10.99 |