Re: [OAUTH-WG] JWT Secured Authorization Request (JAR) vs OIDC request object

[Brian Campbell <[e-mail]>]

FWIW, as best I can remember the change in question came as I result
of directorate/IESG
review rather than a WG decision/discussion. Which is likely why you can't
find the "why" anywhere in the mailing list archive.

On Wed, Aug 28, 2019 at 3:23 PM Filip Skokan <[e-mail]> wrote:

> Well it kind of blows, doesn't it? I wasn't able to find the "why"
> anywhere in the mailing list archive around the time this was changed.
>
> My take on satisfying both worlds looks like this
>
> - allow just JAR - no other params when possible.
>     (which btw isn't possible to do with request_uri when enforcing client
> based uri whitelist and the jwsreq 5.2.2 shows as much)
> - enforce the "dupe behaviours" defined in OIDC (if response_type or
> client_id is in request object it must either be missing or the same in
> regular request).
> - allows merging request object and regular parameters with request object
> taking precedence since it is a very useful feature when having pre-signed
> request object that's not one time use and clients using it wish to vary
> state/nonce per-request.
>
> I wish the group reconsidered making this breaking change from OIDC's take
> on request objects - allow combination of parameters from the request
> object with ones from regular parameters (if not present in request object).
>
> S pozdravem,
> *Filip Skokan*
>
>
> On Wed, 28 Aug 2019 at 23:02, Brian Campbell <[e-mail]>
> wrote:
>
>> Filip, for better or worse, I believe your assessment of the situation is
>> correct. I know of one AS that didn't choose which of the two to follow but
>> rather implemented a bit of a hybrid where it basically ignores everything
>> outside of the request object per JAR but also checks for and enforces the
>> presence and value of the few regular parameters (client_id, response_type)
>> that OIDC mandates.
>>
>> On Tue, Aug 27, 2019 at 5:47 AM Filip Skokan <[e-mail]> wrote:
>>
>>> Hello everyone,
>>>
>>> in an earlier thread I've posed the following question that might have
>>> gotten missed, this might have consequences for the existing
>>> implementations of Request Objects in OIDC implementations - its making
>>> pure JAR requests incompatible with OIDC Core implementations.
>>>
>>> draft 14 of jwsreq (JAR) introduced this language
>>>
>>> The client MAY send the parameters included in the request object
>>>> duplicated in the query parameters as well for the backward
>>>> compatibility etc.
>>>>
>>>> *However, the authorization server supporting thisspecification MUST
>>>> only use the parameters included in the requestobject. *
>>>
>>>
>>> Server MUST only use the parameters in the Request Object even if the
>>>> same parameter is provided in the query parameter.  The Authorization
>>>
>>>
>>> The client MAY send the parameters included in the request object
>>>> duplicated in the query parameters as well for the backward
>>>> compatibility etc.
>>>>
>>>> *However, the authorization server supporting thisspecification MUST
>>>> only use the parameters included in the requestobject. *
>>>
>>>
>>> Nat, John, everyone - *does this mean a JAR compliant AS ignores
>>> everything outside of the request object while OIDC Request Object one
>>> merges the two with the ones in the request object being used over ones
>>> that are sent in clear?* The OIDC language also includes sections which
>>> make sure that some required arguments are still passed outside of the
>>> request object with the same value to make sure the request is "valid"
>>> OAuth 2.0 request (client_id, response_type), something which an example in
>>> the JAR spec does not do. Not having this language means that existing
>>> authorization request pipelines can't simply be extended with e.g. a
>>> middleware, they need to branch their codepaths.
>>>
>>> Is an AS required to choose which of the two it follows?
>>>
>>> Thank you for clarifying this in advance. I think if either the
>>> behaviour is the same as in OIDC or different this should be called out in
>>> the language to avoid confusion, especially since this already exists in
>>> OIDC and likely isn't going to be read in isolation, especially because the
>>> Request Object is even called out to be already in place in OIDC in the JAR
>>> draft.
>>>
>>> Best,
>>> *Filip*
>>> _______________________________________________
>>> OAuth mailing list
>>> [e-mail]
>>> https://www.ietf.org/mailman/listinfo/oauth
>>>
>>
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>

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