Re: [Rats] Robert Wilton's Discuss on draft-ietf-rats-eat-21: (with DISCUSS and COMMENT)

["Smith, Ned" <[e-mail]>]

BTW: [RATS.Architecture] is now RFC9334. Regardless of whether it is informative or normative, the reference should be updated.

I believe it is informative because RFC9334 is an informative RFC.

On 9/7/23, 6:11 AM, "RATS on behalf of Robert Wilton via Datatracker" <[e-mail] <mailto:[e-mail]> on behalf of [e-mail] <mailto:[e-mail]>> wrote:


Robert Wilton has entered the following ballot position for
draft-ietf-rats-eat-21: Discuss


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DISCUSS:
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Hi,


Thanks for this document. Sorry, I didn't have time to review this document
that closely. I have flagged one issue for discussion to change the reference
to the architecture document to being a normative reference. This would mean a
downref, but should otherwise be an easy change to make. The rest of my
comments are non-blocking.


(1) p 71, sec 11.2. Informative References


[RATS.Architecture]
Birkholz, H., Thaler, D., Richardson, M., Smith, N., and
W. Pan, "Remote ATtestation procedureS (RATS)
Architecture", Work in Progress, Internet-Draft, draft-
ietf-rats-architecture-22, 28 September 2022,
<https://datatracker.ietf.org/doc/html/draft-ietf-rats- <https://datatracker.ietf.org/doc/html/draft-ietf-rats->
architecture-22>.


"From section 1.3, EAT follows the operational model described in Figure 1 in
[RATS.Architecture].". This, along with other references indicates that the
RATS architecture should be a normative reference.




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COMMENT:
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(2) p 0, sec


An EAT is either a CBOR Web Token (CWT) or JSON Web Token (JWT) with
attestation-oriented claims.


This is probably contentious, but given that this is a new spec, I wonder
whether it wouldn't be better (i.e., encourage wider interop) if only CBOR,
COSE and CWT were used/allowed.


(3) p 20, sec 4.2.6. swname (Software Name) Claim


The "swname" claim contains a very simple free-form text value for
naming the software used by the entity. Intentionally, no general
rules or structure are set. This will make it unsuitable for use
cases that wish precise naming.


I found it interesting, and slightly surprising, that the hardware model claim
is opaque, but the software name claim is not.


(4) p 24, sec 4.2.11. uptime (Uptime) Claim


The "uptime" claim MUST contain a value that represents the number of
seconds that have elapsed since the entity or submodule was last
booted.


Relative to other claim descriptions, the MUST in this description seems
strange. Perhaps better as just "The "uptime" claim contains a value ..."


(5) p 88, sec Appendix B. UEID Design Rationale


A UEID is not a UUID [RFC4122] by conscious choice for the following
reasons.


Note that the UUID spec is currently being updated (it is also on this week's
telechat review), so some of the concerns being described here may no longer be
valid. It is still only 128 bits though, and 6 bits are spent identifying UUID
format and version.


(6) p 89, sec Appendix B. UEID Design Rationale


Note also that that a type 2 UEID (EUI/MAC) is only 7 bytes compared
to 16 for a UUID.


Note that the paragraph at the end of appendix B.1. states that UEIDs are a
minumum of 128 bits ...


Regards,
Rob






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