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

[Brian Campbell <[e-mail]>]

And that's done:
https://mailarchive.ietf.org/arch/msg/oauth/W0eq4HUiiLVS5F5qyXXY6Gdw7vs/

On Mon, Dec 14, 2020 at 8:42 AM Torsten Lodderstedt <torsten=
[e-mail]> wrote:

> +1 for following Vladimir’s proposal
>
> > Am 14.12.2020 um 14:54 schrieb Brian Campbell <bcampbell=
> [e-mail]>:
> >
> > er, I mean an -05
> >
> > On Mon, Dec 14, 2020 at 6:45 AM Brian Campbell <
> [e-mail]> wrote:
> > 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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> > --
> > Vladimir Dzhuvinov
> >
> >
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