Question about nethack and setgid
bonomi at mail.r-bonomi.com
Thu Mar 3 01:41:50 UTC 2011
> Date: Wed, 02 Mar 2011 23:51:45 +0100
> From: David Demelier <demelier.david at gmail.com>
> To: freebsd-questions at freebsd.org
> Subject: Question about nethack and setgid
> I don't understand how nethack can store the score in
> the real binary is here /usr/local/lib/nethack/nethack
> And the mode is
> -rwxr-sr-x 1 games games 1793635 25 Jan 2011
> So that means people in games group will run nethack as games user (owner
> of file)
Actually, it means that the program will run with the _group_ id of the
file -- i.e. the 'games' group. _That_ 's' is the 'sgid' or 'set groupID'
> but I'm not in games group ! and I can save the file located in
> /usr/local/lib/nethack/logfile which mode is -rw-rw-r-- games games
Lo and behold! The file _is_ writable by the games group.
> I'm writing a game that will store file too, because I can't make it
> works like nethack I was planning using the setuid mode but I don't like
> much this ..
> What am I misunderstanding?
the function of the 'setgid' bit. <grin.
> David Demelier
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