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

[Filip Skokan <[e-mail]>]

It would be fine not allowing that across the board but rather through a language like so

‘Authorization Servers MAY allow per-transaction parameters such as “state” and “nonce” to be sent outside of the Request Object using regular OAuth 2.0 parameter syntax, the specific parameters are at the implementer’s discretion’

Odesláno z iPhonu

28. 8. 2019 v 23:23, Filip Skokan <[e-mail]>:

> 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 this
>>>> specification MUST only use the parameters included in the request
>>>> object. 
>>> 
>>>> 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 this
>>>> specification MUST only use the parameters included in the request
>>>> object. 
>>> 
>>> 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
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>> 
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