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Re: I would like to change the behavior of MCS label creations in directory.



On Fri, 2011-09-23 at 11:07 -0400, Stephen Smalley wrote:
> On Fri, 2011-09-23 at 11:01 -0400, Daniel J Walsh wrote:
> > >>>>> Currently if I create a directory labeled
> > >>>>> 
> > >>>>> etc_t:s0:c1
> > >>>>> 
> > >>>>> And with a process running as unconfined_t:s0-s0:c0.c1023
> > >>>>> create a file within the directory, the file gets created
> > >>>>> with the label etc_t:s0.   I would like to change the
> > >>>>> behavior to creating the file as etc_t:s0:c1.
> > >>>>> 
> > >>>>> That way an administrator could modify files within a
> > >>>>> sandbox and have the files be labeled correctly.
> > >>>>> 
> > >>>>> I believe this behavior differs from MLS but believe this
> > >>>>> would be what the admin expects.
> > >>>>> 
> > >>>>> Is changing this a kernel or policy issue?
> > >>>> 
> > >>>> That would be a kernel change, and it would have to be
> > >>>> configurable so that it can differ for MLS vs MCS.
> > >>>> 
> > >>> It would seem that we should be able to state the behaviour in
> > >>> policy.

[cut]

> Need to distinguish low vs high.  In MLS, you want to inherit the low
> level of the source/subject/process.
> 
> Also, do you want the MCS behavior for all types or selectively?  For
> example, if a svirt_t:s0:c256,c387 process creates a file in a :s0
> directory (is that even possible?), do you really want that file to
> be :s0?

My opinion is: yes/NO.

So in other words, my opinion is that a categorized process should
always been allowed to write to an uncategorized directory. And then
that the default label for anything created by a categorized process,
should definitely be categorized.

However, there is an issue. For example, a given SELinux user might have
access to more than one category. What would be the default category for
labeling files produced by that user ?

Regards,

Guido


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