Re: [Suit] New Version Notification for draft-moran-suit-mti-00.txt

Brendan Moran <Brendan.Moran@arm.com> Wed, 27 July 2022 22:02 UTC

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From: Brendan Moran <Brendan.Moran@arm.com>
To: Laurence Lundblade <lgl@island-resort.com>
CC: suit <suit@ietf.org>
Thread-Topic: [Suit] New Version Notification for draft-moran-suit-mti-00.txt
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Archived-At: <https://mailarchive.ietf.org/arch/msg/suit/JHzP_QuEMxpt_tkRQZdAwy-ni2E>
Subject: Re: [Suit] New Version Notification for draft-moran-suit-mti-00.txt
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I’ve now uploaded a new version of the draft that should be a better structure.

Best Regards,
Brendan

On 21 Jul 2022, at 13:07, Brendan Moran <Brendan.Moran@arm.com<mailto:Brendan.Moran@arm.com>> wrote:

Hi Lawrence,

Sorry I’ve been silent: I’ve been laid up with Covid for over a week.


You’re right. It turns out I published the wrong version of my draft. Oops.

The right version is here: https://github.com/bremoran/suit-mti/blob/main/draft-moran-suit-mti-algorithms.md

Unfortunately, I can’t submit it until next week due to the draft publication blackout.

Essentially, I see this as a one-of-three choice. You, as an implementor, can choose to implement one of three MTI profiles:
* A classical asymmetric profile
* A PQC asymmetric profile
* A symmetric profile

You are welcome to implement other profiles as needed.

I think that the 1-of-3 choice is going to be necessary because, otherwise, there’s no way we’re going to have many compliant implementations.

Best Regards,
Brendan

On 14 Jul 2022, at 19:35, Laurence Lundblade <lgl@island-resort.com<mailto:lgl@island-resort.com>> wrote:

Hi,

Not being a SUIT implementor, I’m kind of peanut gallery here so maybe my comments don’t have a lot of weight.

My first reaction is that is lot of algorithms to be mandatory. For example, I’m not even close to supporting all those in t_cose. I didn’t check, but I doubt commonly deployed versions of OpenSSL and Mbedtls support all the algorithms.

Then for a given implementation/deployment you might want to support only one single algorithm on a constrained device to have minimum object code. A tactic might be to require the receiver to support many algorithms and the sender just one.

Is this trying to guarantee interoperability? It seems not since it doesn’t mention it.

I’m not sure about IETF tactics for guaranteeing interoperability. Seems they are kind of loose to me. Maybe that’s OK.

By contrast, FIDO is very specific about algorithms to implement so there is guaranteed interop. This is also because FIDO has a compliance program that tests implementations.

In the recent EAT draft, I defined a constrained device profile that does guarantee algorithm interoperability by requiring the receiver to support ES256, ES384 and ES 512 and the sender to use one of these. There will never be an algorithm mismatch.

LL



On Jul 11, 2022, at 12:57 PM, Brendan Moran <Brendan.Moran@arm.com<mailto:Brendan.Moran@arm.com>> wrote:

Dear SUIT,

I have submitted a draft profile document. It is very much a strawman. Please feel free to bash it/propose edits!

I will upload it too GitHub to make it easier to bash.

Best Regards,
Brendan

On 11 Jul 2022, at 20:54, internet-drafts@ietf.org<mailto:internet-drafts@ietf.org> wrote:


A new version of I-D, draft-moran-suit-mti-00.txt
has been successfully submitted by Brendan Moran and posted to the
IETF repository.

Name: draft-moran-suit-mti
Revision: 00
Title: Mandatory-to-Implement Algorithms for Creators and Consumers of Software Update for the Internet of Things manifests
Document date: 2022-07-11
Group: Individual Submission
Pages: 7
URL: https://www.ietf.org/archive/id/draft-moran-suit-mti-00.txt
Status: https://datatracker.ietf.org/doc/draft-moran-suit-mti/
Htmlized: https://datatracker.ietf.org/doc/html/draft-moran-suit-mti


Abstract:
This document specifies algorithm profiles for SUIT manifest parsers
and authors to ensure better interoperability.




The IETF Secretariat



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_______________________________________________
Suit mailing list
Suit@ietf.org<mailto:Suit@ietf.org>
https://www.ietf.org/mailman/listinfo/suit

_______________________________________________
Suit mailing list
Suit@ietf.org<mailto:Suit@ietf.org>
https://www.ietf.org/mailman/listinfo/suit

IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.
_______________________________________________
Suit mailing list
Suit@ietf.org<mailto:Suit@ietf.org>
https://www.ietf.org/mailman/listinfo/suit

IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.