Re: [Suit] Manifest-07 review

Russ Housley <housley@vigilsec.com> Wed, 24 June 2020 15:08 UTC

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From: Russ Housley <housley@vigilsec.com>
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Date: Wed, 24 Jun 2020 11:08:02 -0400
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Cc: Henk Birkholz <henk.birkholz@sit.fraunhofer.de>, suit <suit@ietf.org>, Dick Brooks <dick@reliableenergyanalytics.com>, "Waltermire, David A. (Fed)" <david.waltermire=40nist.gov@dmarc.ietf.org>
To: Brendan Moran <Brendan.Moran@arm.com>
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Subject: Re: [Suit] Manifest-07 review
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I was talking about the file extension for a signed manifest.

Russ


> On Jun 24, 2020, at 10:24 AM, Brendan Moran <Brendan.Moran@arm.com> wrote:
> 
> I’m not certain what *we* are talking about. *I* am talking about SUIT_Envelope or, to be more precise, SUIT_Envelope_Tagged (that is #6.TBD(SUIT_Envelope)). I think that SUIT_Envelope_Tagged could have a “.suit” file name extension. I think it’s probably a bad idea to have SUIT_Manifest floating around on your system without the envelope or a signature. Maybe you could add a COSE_Sign to it. Then, you might want a “.cose” file name extension.
> 
> Brendan
> 
>> On 24 Jun 2020, at 14:48, Henk Birkholz <henk.birkholz@sit.fraunhofer.de <mailto:henk.birkholz@sit.fraunhofer.de>> wrote:
>> 
>> Are we talking about every "software object" that starts with a CBOR tag as defined in this document?
>> 
>> I assume that a manifest in the form of a file can be wrapped or not be wrapped in a SUIT envelope. Would that result in the same file extension ".suit"?
>> 
>> Viele Grüße,
>> 
>> Henk
>> 
>> On 24.06.20 15:42, Brendan Moran wrote:
>>> The intent is to register a CBOR tag that identifies the manifest envelope. This allows detection of manifests by signature in the first 2-3 bytes. A typical filename extension would be fine. I think the most suitable suggestion would be “.suit” if that suits the working group. We’re past the days of 3 letter extensions now, right?
>>> Best Regards,
>>> Brendan
>>>> On 24 Jun 2020, at 14:35, Dick Brooks <dick@reliableenergyanalytics.com <mailto:dick@reliableenergyanalytics.com>> wrote:
>>>> 
>>>> Are there plans for a standard file naming nomenclature to identify software
>>>> objects that contain a suit manifest?
>>>> 
>>>> Today, I use the filename extension to drive an introspection procedure to
>>>> generate an SBOM and having a defined filename extension to indicate that a
>>>> suit manifest is present would help, otherwise I have to parse each file to
>>>> determine which SBOM introspection procedure to invoke.
>>>> 
>>>> Thanks,
>>>> 
>>>> Dick Brooks
>>>> 
>>>> Never trust software, always verify and report! T
>>>> http://www.reliableenergyanalytics.com <http://www.reliableenergyanalytics.com/>
>>>> Email: dick@reliableenergyanalytics.com
>>>> Tel: +1 978-696-1788
>>>> 
>>>> -----Original Message-----
>>>> From: Suit <suit-bounces@ietf.org> On Behalf Of Waltermire, David A. (Fed)
>>>> Sent: Wednesday, June 24, 2020 9:30 AM
>>>> To: Rønningstad, Øyvind <Oyvind.Ronningstad@nordicsemi.no>no>; suit
>>>> <suit@ietf.org>
>>>> Subject: Re: [Suit] Manifest-07 review
>>>> 
>>>> Øyvind,
>>>> 
>>>> Thanks for this review!
>>>> 
>>>> Dave
>>>> 
>>>> -----Original Message-----
>>>> From: Suit <suit-bounces@ietf.org> On Behalf Of Rønningstad, Øyvind
>>>> Sent: Wednesday, June 24, 2020 6:03 AM
>>>> To: suit <suit@ietf.org>
>>>> Subject: [Suit] Manifest-07 review
>>>> 
>>>> Hi guys, here is a review of manifest-07. Mostly small stuff.
>>>> 
>>>> Questions:
>>>> .... Section 6.4: What are the guidelines for extracting the vendor-id,
>>>> class-id, device-id, or version of a component?
>>>> .... Suit-condition-component-offset is used in an example, but marked as TBD
>>>> in its section. I see that it is described in 6.4 as
>>>> "assert(offsetof(component) == arg)". What are the semantics of "offsetof"?
>>>> .... Can suit-directive-process-dependency be done on a component, or just on
>>>> a dependency? Generally, there seems to be some mismatch between the
>>>> description in 6.4 (which implies that most directives and conditions only
>>>> apply to a component index) and textual descriptions e.g. in 9.8.4.1 and
>>>> 9.8.4.2 (which imply that directives and conditions apply to whichever is
>>>> available of component index and dependency index).
>>>> .... (It would be very beneficial to make 6.4 "Abstract Machine Description"
>>>> more prominent, e.g. by linking from the individual section for commands,
>>>> since 6.4 contains very useful info about how the commands work, and it's
>>>> hard to discover otherwise.) .. What (if any) are the rules regarding when
>>>> to perform dependency-resolution, payload-fetch, and install, and when to
>>>> perform only validate, load, and run?
>>>> .... suit-manifest-sequence-number: "Each Recipient MUST reject any manifest
>>>> that has a sequence number lower than its current sequence number." Are
>>>> there several "current sequence number"s or just one for each SUIT
>>>> processor. Exactly when is the "current sequence number" updated?
>>>> .... What should the processor do when waiting on a suit-directive-wait? Can
>>>> it be interpreted as "try again later", or "busy wait"?
>>>> .... There are important limitations to what sort of commands can be in
>>>> suit-common. Could the limitations be reflected in the CDDL? It seems like a
>>>> natural thing to do, to make the limitations more prominent.
>>>> .... When processing dependencies, how do we know when to a) expect a
>>>> signature and b) check the signature on a dependency manifest?
>>>> .... Did we mean for short payloads to be embeddable in the manifest (I can't
>>>> find this)? This would be very useful for setting configuration options via
>>>> SUIT manifests.
>>>> .... Is the device-identifier unique for each individual device, or for a
>>>> collection of devices?
>>>> .... Why are suit-directive-set-component-index and
>>>> suit-directive-set-dependency-index not implemented through set-parameters?
>>>> Are they subject to the same override mechanics? If not, it might be
>>>> confusing with suit-parameter-source-component, which seems to be analogous
>>>> to set-component-index, but might have subtly different behavior because of
>>>> override mechanics.
>>>> 
>>>> Nits:
>>>> .... Suit-directive-fetch: "manifest-index" is not referred to elsewhere in
>>>> the document.
>>>> .... Section 7: Suggested edit in bold: "A digest should always be set using
>>>> Override Parameters, since this prevents a less-privileged dependent OR
>>>> dependency from replacing the digest."
>>>> .... suit-condition-update-authorized seems like it could use some metadata
>>>> to help determine what is being authorized, e.g. A human readable prompt if
>>>> user interaction is required, or an identifier if multiple instances of the
>>>> condition are used in a manifest.
>>>> 
>>>> 
>>>> Thanks for the good work,
>>>> 
>>>> Øyvind
>>>> 
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