Re: Fedora 34 Change: Signed RPM Contents (late System-Wide Change)

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On Tue, Jan 12, 2021 at 8:21 PM Brian C. Lane <bcl@xxxxxxxxxx> wrote:
>
> On Tue, Jan 05, 2021 at 01:05:01PM -0500, Ben Cotton wrote:
> > https://fedoraproject.org/wiki/Changes/Signed_RPM_Contents
> >
> > Note that this change was submitted after the deadline, but since it can be
> > shipped in an complete state, I am still processing it for Fedora 34.
> >
> >
> > == Summary ==
> > We want to add signatures to individual files that are part of shipped RPMs.
> > These signatures will use the Linux IMA (Integrity Measurement
> > Architecture) scheme, which means they can be used to enforce runtime
> > policies to ensure execution of only trusted files.
>
> Who is going to use this feature? My guess is a very limited set of
> users, so it seems unfair to dramatically increase the size of their
> downloads and install footprint to support something they don't use.
> Can't they be shipped on the side? An rpm of signatures that's
> optionally installed would be more user friendly.
>
> Also, I (being unfamiliar with IMA), don't see how this is any better
> than trusting the file hash signed by the fedora keys that we currently
> have.

I wasn't aware the current rpm has functionality integrated with
kernel/tpm and other functionality to do it at runtime access of the
files, I thought it was more an audit style use case such as rpm -V to
see if something had changed. IMA is more about being able to check at
runtime and setting policies of what to do if something has changed.
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