Re: [OAUTH-WG] PAR error for redirect URI?

[Brian Campbell <[e-mail]>]

Thanks Vladimir, that seems quite reasonable. Barring any objections, I'll
add that to a -04.

On Mon, Dec 14, 2020 at 1:33 AM Vladimir Dzhuvinov <[e-mail]>
wrote:

> Hi Brian,
>
> I'd like to propose the sentence in bold to be inserted into the current
> section 2.3 of PAR -04:
>
> https://tools.ietf.org/html/draft-ietf-oauth-par-04#section-2.3
>
> The authorization server returns an error response with the same format as
> is specified for error responses from the token endpoint in Section 5.2
> of [RFC6749] using the appropriate error code from therein or from Section 4.1.2.1
> of [RFC6749]. *In those cases where Section 4.1.2.1 of [RFC6749]
> prohibits automatic redirection with an error back to the requesting client
> and hence doesn’t define an error code, for example when the request fails
> due to a missing, invalid, or mismatching redirection URI, the
> “invalid_request” error code can be used as the default error code.*
>
> Hope with this we can close the case.
>
> Vladimir
>
> On 04/12/2020 18:08, Brian Campbell wrote:
>
>
>
> On Fri, Dec 4, 2020 at 12:30 AM Vladimir Dzhuvinov <
> [e-mail]> wrote:
>
>> If people have articulated a need to have an invalid_redirect_uri error
>> for the PAR endpoint, then let's register it properly. Rifaat says there's
>> still time to do this.
>>
>
> Following from the response I recently sent to Neil, I don't think a
> legitimate need has been articulated.
> https://mailarchive.ietf.org/arch/msg/oauth/gMiH1mTr0AKDvWpqO1zikcVUySY/
>
>
>> I'm also okay with using the general invalid_request code for this. In
>> this case a sentence, next to the current example, spelling out what the
>> PAR endpoint must do on a invalid redirect URI will help.
>>
> I don't know that that's needed either. But do have some text to suggest
> that you think would be helpful?
>
>
>
>> Vladimir
>> On 03/12/2020 13:49, Rifaat Shekh-Yusef wrote:
>>
>> Torsten, Filip,
>>
>> You can absolutely make this change, as we are still very early in the
>> process.
>> So feel free to continue this effort and try to get WG agreement on this,
>> and update the document as needed.
>>
>> Regards,
>>  Rifaat
>>
>>
>> On Thursday, December 3, 2020, Filip Skokan <[e-mail]> wrote:
>>
>>> To be clear, I'm not advocating to skip the registration, just wanted to
>>> mention a potential concern. If the process allows it and it will not
>>> introduce more delay to publication, I think we should go ahead and
>>> register the error code.
>>>
>>> Best,
>>> *Filip*
>>>
>>>
>>> On Thu, 3 Dec 2020 at 11:06, Torsten Lodderstedt <
>>> [e-mail]> wrote:
>>>
>>>>
>>>>
>>>> > Am 03.12.2020 um 09:56 schrieb Filip Skokan <[e-mail]>:
>>>> >
>>>> > There are several documents already mentioning "invalid_redirect_uri"
>>>> as an error code, specifically RFC7519 and OpenID Connect Dynamic Client
>>>> Registration 1.0. But these don't register it in the IANA OAuth Extensions
>>>> Error Registry, presumably because they're neither for the authorization or
>>>> token endpoints.
>>>> >
>>>> > While I think it'd be great if we had this error code registered, I
>>>> also worry that its registration could confuse implementers to think it's
>>>> okay to return it from the authorization endpoint.
>>>>
>>>> I understand your concern. On the other hand, registering the error
>>>> code is in my opinion the proper way forward. The registration is scoped to
>>>> a usage location, should be pushed authorization endpoint then, and RFC6749
>>>> gives clear guidance on how to treat errors related to the redirect URI at
>>>> the authorization endpoint.
>>>>
>>>> "If the request fails due to a missing, invalid, or mismatching
>>>>    redirection URI, … authorization server ... MUST NOT automatically
>>>> redirect the user-agent to the
>>>>    invalid redirection URI."
>>>>
>>>> I think if an implementor ignores this, it will ignore any advise.
>>>>
>>>> best regards,
>>>> Torsten.
>>>>
>>>> >
>>>> > Best,
>>>> > Filip
>>>> >
>>>> >
>>>> > On Thu, 3 Dec 2020 at 00:29, Brian Campbell <bcampbell=
>>>> [e-mail]> wrote:
>>>> > During the course of a recent OIDF FAPI WG discussion (the FAPI
>>>> profiles use PAR for authz requests) on this issue it was noted that
>>>> there's no specific error code for problems with the redirect_uri (the
>>>> example in
>>>> https://www.ietf.org/archive/id/draft-ietf-oauth-par-04.html#section-2.3
>>>> even shows a general error code with mention of the redirect_uri not being
>>>> valid in the error description). Some folks on that call thought it would
>>>> be worthwhile to have a more specific error code for an invalid
>>>> redirect_uri and I reluctantly took an action item to raise the issue here.
>>>> At the time I'd forgotten that PAR had already passed WGLC. But it's been
>>>> sitting idle while awaiting the shepherd writeup since mid September so
>>>> it's maybe realistic to think the window for a small change is still open.
>>>> >
>>>> > Presumably nothing like an "invalid_redirect_uri" error code was
>>>> defined in RFC 6749 because that class of errors could not be returned to
>>>> the client via redirection. But the data flow in PAR would allow for a
>>>> "invalid_redirect_uri" so it's not an unreasonable thing to do.
>>>> >
>>>> > As I write this message, however, I'm not personally convinced that
>>>> it's worth making a change to PAR at this point. But I did say I'd bring
>>>> the question up in the WG list and I'm just trying to be true to my word.
>>>> So here it is. Please weigh in, if you have opinions on the matter.
>>>> >
>>>> >
>>>> >
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>>
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> --
> Vladimir Dzhuvinov
>
>

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