Question about nethack and setgid
demelier.david at gmail.com
Thu Mar 3 08:55:51 UTC 2011
On 03/03/2011 02:49, Robert Bonomi wrote:
>> 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.
Okay, that's why the program was running on my user but with games
group. I didn't see that the file was writable by games group neither. I
understand everything now and my game is working too :-)
>> David Demelier
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