Re: [OAUTH-WG] Second AD Review: draft-ietf-oauth-mtls

[Brian Campbell <[e-mail]>]

Thanks Roman, I'll work to incorporate those suggestions into the next
revision before the impending I-D submission cutoff date.

On Mon, Jun 24, 2019 at 2:14 PM Roman Danyliw <[e-mail]> wrote:

> Hi Brian!
>
>
>
> My response is inline ...
>
>
>
> *From:* Brian Campbell [mailto:[e-mail]]
> *Sent:* Monday, June 24, 2019 1:17 PM
> *To:* Roman Danyliw <[e-mail]>
> *Cc:* oauth <[e-mail]>
> *Subject:* Re: [OAUTH-WG] Second AD Review: draft-ietf-oauth-mtls
>
>
>
> Thanks for the additional review, Roman. I feel lucky, it's not often one
> gets *two* AD reviews :)  Please see below for replies inline with a few
> followup questions.
>
>
>
> [Roman] *chuckle*
>
>
>
> On Sat, Jun 22, 2019 at 12:29 PM Roman Danyliw <[e-mail]> wrote:
>
> Hi!
>
> I conducted as second AD review of draft-ietf-oauth-mtls per the AD
> hand-off.  I have the following additional feedback:
>
> ** Per ekr's earlier review at
> https://mozphab-ietf.devsvcdev.mozaws.net/D3657, paraphrasing:
> -- Section 2.1.2, How is these metadata parameters being obtained?
>
>
>
> The authorization server can obtain client metadata via the Dynamic Client
> Registration Protocol [RFC7591], which is referenced in the top of that
> section. Also the metadata defined by RFC7591, and registered extensions to
> it, implies a general data model for clients that is used by most
> authorization server implementations even when the Dynamic Client
> Registration Protocol isn't in play. Such implementations typically have
> some sort of  user interface available for managing client configuration.
>
>
>
> Dose that answer your question? Do you believe more should be said in the
> document to better explain or clarify that?
>
>
>
> [Roman]  It does clear it up.  Thanks.  I think it’s worth a short
> statement about how the AS would get the fields.
>
>
>
>
>
> -- Section 3.2, Figure 3.  In this example, what new information is the
> auth server providing to the relying party here?
>
>
>
> The new info here (and in Section 3.1 too) is the hash of the client
> certificate to which the access token is bound, which is in the "cnf"
> confirmation method at the bottom as the "x5t#S256" member.
>
>
>
> [Roman]  Makes sense.  To make the example clearer, I’d call out this out
> in the prose introducing the example.
>
>
>
>
> ** Section 2.0.  What is the expected behavior if the presented
> certificate doesn't match expected client_id?  How is this signaled?
>
>
>
> With a normal OAuth 2.0 error response using the "invalid_client" error
> code per https://tools.ietf.org/html/rfc6749#section-5.2
>
>
>
> Do you think that needs to be stated more explicitly in this document?
>
>
>
> [Roman] Yes, I’d explicit state it with that citation, especially since
> Section 3 discusses of how errors are returned.
>
>
>
>
> ** Section 2.2.  Per the sentence "As pre-requisite, the client registers
> its X.509 certificate ... or a trusted source for its X.509 certificates
> ... with the authorization server.
> -- Editorial: s/As pre-requisite/As a prerequisite/
>
>
>
> done
>
>
>
> -- What's a "trusted source" in this case?  Is that just a jwks_uri?  If
> so, maybe s/a trusted source/a reference to a trust source/.  If not, can
> you please elaborate.
>
>
>
> Yes, it's just a jwks_uri. I'll change that.
>
>
>
>
> A few editorial nits:
> ** Section 2.2.2.  Typo.  s/sec 4.7/Section 4.7/
>
>
>
> fixed
>
>
>
>
> ** Section 3.1  Cite DER encoding as:
>     [X690]     ITU-T, "Information Technology -- ASN.1 encoding rules:
>               Specification of Basic Encoding Rules (BER), Canonical
>               Encoding Rules (CER) and Distinguished Encoding Rules
>               (DER)", ITU-T Recommendation X.690, 2015.
>
>
>
> will do
>
>
>
> ** Section 5.  Typo. s/metatdata/metadata/
>
>
>
> yup
>
>
>
>
> ** Section 6.  Typo.  s/The the/The/
>
>
>
> got it
>
>
>
>
> ** Section 7.2. Typo.  s/the the/the/
>
>
>
> done
>
>
>
>
> ** Appendix. Cite the figures numbers (#5 - 7) in the text describing the
> contents of the section.
>
>
>
> will do
>
>
>
>
> The shepherd write-up is in good shape.  Thank you.
>
> Regards,
> Roman
>
>
>
> [Roman] Thanks for all of the above.
>
>
>
> Roman
>
>
>
>
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