[Ace] Progressing draft-ietf-ace-oauth-authz

[Ludwig Seitz <[e-mail]>]

Hello ACE (Cc to OAuth designated expert Justin),

The progress of draft-ietf-ace-oauth-authz is currently blocked due to an issue that has come to light in the IANA review process, and I'd like to solicit the feedback of the WG to determine how to go forward.

The issue is related to parameters used by the AS when responding to an Introspection query (see https://datatracker.ietf.org/doc/html/draft-ietf-ace-oauth-authz-45#section-5.9.2). Our approach so far has been to map all OAuth parameters to ACE and map all parameters created for the ACE interaction back to OAuth. The issue is that some of the ACE parameters (cnonce and cti, see Figure 16) have the datatype "byte string". In OAuth the Introspection parameters are formatted as JSON payload, which precludes the use of raw byte strings, a fact we overlooked when we tried to register the new parameters in the OAuth registry ( see https://www.iana.org/assignments/oauth-parameters/oauth-parameters.xhtml#token-introspection-response).

My proposed fix for this would be to amend the descriptions of these two parameters in 5.9.2, specifying that their JSON representation is a text string containing the Base64url encoding of the original byte string payload.

Does the working group or the OAuth designated expert have any objections (or suggestions) to this approach?

Regards,

Ludwig

--
Ludwig Seitz
Infrastructure Security Analyst
Combitech AB
Djäknegatan 31 . SE-211 35 Malmö . Sweden
Phone: [phone]
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