Re: [OAUTH-WG] draft-ietf-oauth-rar use of “WWW-Authenticate” Response Header

["Oliva Fernandez, Jorge" <[e-mail]>]

Thanks for the answer, Bryan!

I’m not sure if I understand correctly, the authorization details are API-specific the same as the “scope” right? Let me know if I’m misinterpreting something but for me RAR is an evolution of the scope, because the scope parameter is not useful for complex authorization decision we introduce a new field, with a rich syntax to describe the operation that is going to be authorized, right? So, if OAuth define that the protected resource is able to indicate problems with the authorization bearer using the WWW-Authenticate Response Header Field, is not exactly the same case when a protected resource needs the rich authorization?

Best regards.

From: OAuth <[e-mail]> on behalf of Brian Campbell <bcampbell=[e-mail]>
Date: Thursday, 25 May 2023 at 21:30
To: "Oliva Fernandez, Jorge" <Jorge.OlivaFernandez=[e-mail]>
Cc: "[e-mail]" <[e-mail]>
Subject: [EXT]Re: [OAUTH-WG] draft-ietf-oauth-rar use of “WWW-Authenticate” Response Header

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The thinking was generally that params of WWW-Authenticate Response Header Field weren't a great fit for rich JSON authorization data (both in syntax and semantics).  The authorization detail types are really API-specific things, and as a result, it's expected that the methods by which clients obtain or generate the authorization details are also API-specific. Not sure that exactly answers the question but hopefully helps.



On Thu, May 25, 2023 at 5:16 AM Oliva Fernandez, Jorge <Jorge.OlivaFernandez=[e-mail]<mailto:[e-mail]>> wrote:
Hi,

I have been reviewing the last RAR draft (https://datatracker.ietf.org/doc/html/draft-ietf-oauth-rar-23) and I was expecting to find some references about how to use the “WWW-Authenticate” Response Header Field defined in RFC6750 (https://datatracker.ietf.org/doc/html/rfc6750#section-3) in this document.

I think that RAR is a great idea for complex authorization where a “scope” is not enough to describe what you want to authorize, in OAuth 2.0 there exist a way for a protected resource to indicate what “scopes” are need it to consider the request “authorized”, should not be an standard way to do the same for rich authorization request?

Best regards.
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