Re: [Rats] [Teep] EAT claims needed by TEEP

Michael Richardson <mcr+ietf@sandelman.ca> Fri, 12 November 2021 22:09 UTC

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From: Michael Richardson <mcr+ietf@sandelman.ca>
To: "rats\@ietf.org" <rats@ietf.org>, teep <teep@ietf.org>
cc: Dave Thaler <dthaler=40microsoft.com@dmarc.ietf.org>
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Date: Fri, 12 Nov 2021 17:09:37 -0500
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Subject: Re: [Rats] [Teep] EAT claims needed by TEEP
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Dave Thaler <dthaler=40microsoft.com@dmarc.ietf.org> wrote:
    > My takeaway is that TEEP (with various participants from SUIT
    > and RATS who weighed in) believes that RATS should define
    > a claim in the EAT spec, but leave the *values* to be defined by
    > profiles and by vendors (i.e., both categories are needed).
    > The TEEP profile would define values used by TEEP use cases,
    > as would other profiles.  Vendors would be able to define
    > vendor-specific values in addition to standard values defined in profiles.

Having missed this morning's party due to conflicts, I'm pleased by this
result.  That's basically what I said.
RATS needs to standardize that there such a claim, but it's not acceptable in
the end for it to be free-for-all.  TEEP needs to be clear as to what is
going to go in.

    > Also TEEP had strong consensus that the values should be opaque
    > not structured.   As such, some believe a UUID would be better
    > than a byte blob or text string because a UUID helps ensure opaqueness,
    > but that's for RATS to decide if RATS defines the claim and requirements
    > for profiles.

I'm all for it being up to TEEP.  I'm okay with UUID.
I would also suggest some kind of PEN-based structure, perhaps based upon a
two element CBOR array like: [ PEN, bstr ]

--
Michael Richardson <mcr+IETF@sandelman.ca>   . o O ( IPv6 IøT consulting )
           Sandelman Software Works Inc, Ottawa and Worldwide