[Devel] Re: LSM stacking/secondary modules / RFC: Socket MAC LSM

[Serge E. Hallyn]

(Sorry!  Meant to add extra recipients!)

Quoting Serge E. Hallyn (serue at us.ibm.com):
> Quoting Stephan Peijnik (stephan at peijnik.at):
> > On Wed, 2009-01-14 at 15:16 -0800, Greg KH wrote:
> > > On Wed, Jan 14, 2009 at 11:28:51PM +0100, Stephan Peijnik wrote:
> > > > But Tuxguardian provides a different set of features and works
> > > > differently. 
> > > 
> > > Not entirely, SELinux provides a lot of what it sounds like Tuxguardian
> > > provides, but in a different way.  If you were to mix them, it could get
> > > very messy, very quickly.
> > 
> > Well, maybe I don't understand the whole concept behind LSM and/or the
> > security concept in general. But from my understanding it could, in
> > theory, be safe to have at least multiple socket MAC modules running. 
> > If one denies access the others don't need to be consulted. On the other
> > hand, if all allow a specific call to be made it could be granted.
> > 
> > > > Maybe this can't be solved by using the LSM framework, but come up with
> > > > something different and independent.
> > > 
> > > Patches are always welcome.
> > 
> > Even though I have no patches prepared I have been playing around with
> > my ideas.
> > I haven't done a lot of testing on this yet, as it is meant to be a
> > prototype only, but two implementations of a possible Socket MAC
> > subsystem can be found at http://repo.or.cz/w/linux-2.6/sactl.git.
> > 
> > The subsystem is intended to be used by modules like Tuxguardian and
> > does only provide a limited set of information (ie. no direct access to
> > the relevant socket structures, only works for AF_INET and AF_INET6
> > sockets).
> 
> So do you think we could come up with a usable framework using the
> idea which Paul Menage suggests here:
> https://lists.linux-foundation.org/pipermail/containers/2009-January/015280.html
> ?
> 
> Basically, you would use a control group (cgroup) to track tasks.
> I.e. you might launch firefox in a separate 'webclient' cgroup.
> Traffic then gets controlled (and mangled) based on the cgroup
> of the sending/receiving task.
> 
> Presumably one possible iptables target would be something which
> launches a popup window to ask the user 'should task firefox in
> cgroup webclient be allowed to access google.com'?
> 
> Just wondering - and figuring these appear to be two completely distinct
> groups of people having very similar discussion...
> 
> -serge
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