Hi!
> > > +In normal operation, the system seems to stabilize with a roughly
> > > +equal mixture of SYSTEM, USER, and UNTRUSTED processes. Most
> >
> > So you split processes to three classes (why three?), and
> > automagically move them between classes based on some rules? (What
> > rules?)
> >
> > Like if I'm UNTRUSTED process, I may not read ~/.ssh/private_key? So
> > files get this kind of labels, too? And it is "mozilla starts as a
> > USER, but when it accesses first web page it becomes UNTRUSTED"?
>
> Processes are not moved from one integrity level to another, but are
> demoted when they read from a lower integrity level object. By
> definition sockets, are defined as UNTRUSTED, so reading from a
> socket demotes the process to UNTRUSTED. (Secrecy is a separate
> attribute.) In the Mozilla example, /usr/bin/mozilla is defined as
> SYSTEM, preventing any process with lesser integrity from modifying
> it. 'level -s' displays the level of the current process or of a
> given file. For example,
>
> [zohar@L3X098X ~]$ level -s /usr/bin/mozilla
> /usr/bin/mozilla
> security.slim.level: SYSTEM PUBLIC
>
> Both mozilla and firefox-bin are defined as SYSTEM, as soon as the
> firefox-bin process opens a socket, the process is demoted to
> UNTRUSTED.
>
> I hope this answered some of your questions. We're working on
> more comprehensive documentation, which we'll post with the next
> release.
Do you have examples where this security model stops an attack?
Both my mail client and my mozilla will be UNTRUSTED (because of
network connections, right?) -- so mozilla exploit will still be able
t osee my mail? Not good. And ssh connects to the net, too, so it will
not even protect my ~/.ssh/private_key ?
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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