[K12OSN] Re: Dropbox directory permissions

[Les Mikesell]

Robert Arkiletian wrote:
>>
>> I think you are doing this backwards.  If you use the normal RH/fedora
>> scheme where every user has a unique group, all you have to do is add
>> the appropriate teacher(s) to each student's group.  Then the dropbox
>> directory can be wx by all with the sticky bit set and only the teacher
>> and the student who owns it will have access to the file contents.
>>
> 
> No, I'm not using the standard RH scheme of giving each person their
> own group. Even if I was setting wx for all still does not prevent a
> kid from copying a file IF they know the filename.

That's under the user's control without any setuid tricks.  Try 'chmod 
a-rwx' on the file, or setting umask to 0006 before the copy.  Then no 
one but the owner or a group member can access the contents.

-- 
   Les Mikesell
    les at futuresource.com