DM(8)                   386BSD System Manager's Manual                   DM(8)

NNAAMMEE
     ddmm - dungeon master

SSYYNNOOPPSSIISS
     llnn --ss ddmm _g_a_m_e

DDEESSCCRRIIPPTTIIOONN
     DDmm is a program used to regulate game playing.  DDmm 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 ddmm, in the directory /_u_s_r/_g_a_m_e_s for all of the
     regulated games.  The actual binaries for these games should be placed in
     a ``hidden'' directory, /_u_s_r/_g_a_m_e_s/_h_i_d_e, that may only be accessed by the
     ddmm program.  DDmm determines if the requested game is available and, if so,
     runs it.  The file /_e_t_c/_d_m._c_o_n_f controls the conditions under which games
     may be run.

     The file /_e_t_c/_n_o_g_a_m_e_s 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.

FFIILLEESS
     /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

SSEEEE AALLSSOO
     dm.conf(5)

BBUUGGSS
     Two problems result from ddmm 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 com-
     mands.  Probably more important is that ddmm 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 previously had no
     reason to run setuid and which accessed user files may have to be modi-
     fied.

HHIISSTTOORRYY
     The ddmm command appeared in 4.3BSD-Tahoe.

BSD Experimental                 July 23, 1991                               2