On Thu, 2007-09-13 at 10:46 -0400, Karl MacMillan wrote:
> On Thu, 2007-09-13 at 10:08 -0400, Stephen Smalley wrote:
> > On Tue, 2007-09-11 at 17:26 -0400, Karl MacMillan wrote:
> > > On Tue, 2007-09-11 at 16:31 -0400, Daniel J Walsh wrote:
> > > [...]
> > > > One other feature/requirement would be to not override dontaudit rules.
> > > > So if I have a domain in permissive mode and I have a dontaudit rule on
> > > > reading /etc/shadow. The app should still be denied reading
> > > > /etc/shadow. (This is not a show stopper, but would allow us to force
> > > > apps to take the code paths they will take in enforcing mode.)
> > >
> > > This isn't specific to per-domain permissive, right? It would be useful
> > > in general for permissive.
> >
> > I would be opposed to such a change, as it is a semantic change to what
> > dontaudit means.
> >
> > Keep in mind that allow, auditallow, and dontaudit/auditdeny are all
> > independent of one another today and none of them imply the other, e.g.
> > allow a b:file read;
> > auditallow a b:file *;
> > dontaudit a b:file *;
> > is perfectly valid and means:
> > - Let a read files labeled b,
> > - Audit all permission grantings from a to files labeled b,
> > - Don't audit any permission denials from a to files labeled b.
> >
>
> I agree that changing the dontaudit semantic has problems - however the
> reason Dan suggested is still valid. Currently, generating policy in
> permissive mode can lead to bogus or overly permissive policy. It would
> be nice to have some solution to that problem.

Can't you handle that in the tool, by giving matching interfaces with dontaudit rules precedence over ones with allow rules and asking the user?

I'd actually rather see an improved capability for (more easily) generating policy incrementally in enforcing mode. That would make it more suitable for production use and avoid the problem above.

-- 
Stephen Smalley
National Security Agency


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