I realize this is somewhat pedantic but I don't think referencing 4.1.2.1 works given how RFC 6749 set things up. Rather I believe that the device flow needs to define and register "access_denied" as a valid token endpoint response error code (it's not a token endpoint response error per RFC 6749 sec 5.2 nor has it been registered https://www.iana.org/assignmen ts/oauth-parameters/oauth-parameters.xhtml#extensions-error). Also invalid_grant is a a token endpoint response error from RFC 6749 sec 5.2 so that reference is needed and appropriate. RFC 6749 Sec 4.1.2.1 <https://tools.ietf.org/html/rfc6749#section-4.1.2> defines errors returned from the authorization endpoint. But the device flow errors are from the token endpoint.
On Wed, May 30, 2018 at 4:27 PM, William Denniss < wdenniss=40google....@dmarc.ietf.org> wrote: > Hi Andrew, > > On Wed, May 30, 2018 at 3:18 PM, Andrew Sciberras < > andrewsciber...@pingidentity.com> wrote: > >> Hi William >> >> You are right that the document explicitly indicates which error codes >> may be returned. However I think it's ambiguous as to which error within >> Section 5.2 of RFC6749 would apply in the scenario of a user not granting >> access. >> >> I think that this ambiguity is highlighted further by the Google >> implementation (https://developers.google.com >> /identity/protocols/OAuth2ForDevices#step-6-handle- >> responses-to-polling-requests >> <https://developers..google.com/identity/protocols/OAuth2ForDevices#step-6-handle-responses-to-polling-requests>) >> not adhering to the explicit statement of the document and electing to use >> a (more appropriate) error code that exists outside of section 5.2. >> >> > > Oh, I see what you mean now. Yes, given this is an authorization request, > not a token request, the errors from Section 4.1.2.1 > <https://tools.ietf.org/html/rfc6749#section-4.1.2> are more relevant. > > I believe it was the authors intention to reference that set of errors, so > I will plan to update the doc to reference 4..1.2.1 instead. Good catch! > Thank you. > > >> >> On Thu, May 31, 2018 at 8:06 AM, William Denniss <wdenn...@google.com> >> wrote: >> >>> Hi Andrew, >>> >>> On Wed, May 30, 2018 at 2:35 PM, Andrew Sciberras >>> <andrewsciber...@pingidentity.com> wrote: >>> >>> Hello >>>> >>>> >>>> Do we feel that the document should be more specific in addressing how >>>> the authorization service should respond to a device access token request >>>> when the user has refused to grant access to the device? >>>> >>>> >>>> The document currently indicates in section 3.5 that a success response >>>> defined in section 5.1 of RFC6749, an error as defined in section 5.2 of >>>> RFC6749 (this includes invalid_request, invalid_client, invalid_grant, >>>> unauthorized_client, unsupported_grant_type, and invalid_scope), or a new >>>> device flow error code (authorization_pending, slow_down, and >>>> expired_token) may be returned in a response to a device token request.. >>>> >>>> >>>> >>>> It doesn’t seem that any of these options are appropriate to convey >>>> that a user has refused to grant access to the device. >>>> >>>> >>>> The Google implementation appears to be using the access_denied error >>>> code from section 4.1.2.1 of RFC6749. While this would seem to be the most >>>> suitable error code, the document does not explicitly indicate it as a >>>> permitted response. >>>> >>> >>> Actually, this is indicated explicitly I believe: >>> >>> If the user has approved the grant, the token endpoint responds with a >>> success response defined in Section 5.1 of [RFC6749]; *otherwise it >>> responds with an error, as defined in Section 5.2 of [RFC6749].* >>> >> In addition to the error codes defined in Section 5.2 of [RFC6749], the >>> following error codes are specific for the device flow: >>> >>> >>>> >>>> I believe that clarifying the response error code in the condition >>>> where a user has refused access to the client would be beneficial, remove >>>> ambiguity, and promote greater consistency across implementations. >>>> >>>> >>>> Regards >>>> >>>> Andrew Sciberras >>>> >>>> >>>> On Wed, May 30, 2018 at 8:20 AM, The IESG <iesg-secret...@ietf.org> >>>> wrote: >>>> >>>>> >>>>> The IESG has received a request from the Web Authorization Protocol WG >>>>> (oauth) to consider the following document: - 'OAuth 2.0 Device Flow >>>>> for >>>>> Browserless and Input Constrained Devices' >>>>> <draft-ietf-oauth-device-flow-09.txt> as Proposed Standard >>>>> >>>>> The IESG plans to make a decision in the next few weeks, and solicits >>>>> final >>>>> comments on this action. Please send substantive comments to the >>>>> i...@ietf.org mailing lists by 2018-06-12. Exceptionally, comments >>>>> may be >>>>> sent to i...@ietf.org instead. In either case, please retain the >>>>> beginning of >>>>> the Subject line to allow automated sorting. >>>>> >>>>> Abstract >>>>> >>>>> >>>>> This OAuth 2.0 authorization flow for browserless and input >>>>> constrained devices, often referred to as the device flow, enables >>>>> OAuth clients to request user authorization from devices that have >>>>> an >>>>> Internet connection, but don't have an easy input method (such as a >>>>> smart TV, media console, picture frame, or printer), or lack a >>>>> suitable browser for a more traditional OAuth flow. This >>>>> authorization flow instructs the user to perform the authorization >>>>> request on a secondary device, such as a smartphone. There is no >>>>> requirement for communication between the constrained device and the >>>>> user's secondary device. >>>>> >>>>> >>>>> >>>>> >>>>> The file can be obtained via >>>>> https://datatracker.ietf.org/doc/draft-ietf-oauth-device-flow/ >>>>> >>>>> IESG discussion can be tracked via >>>>> https://datatracker.ietf.org/doc/draft-ietf-oauth-device-flow/ballot/ >>>>> >>>>> >>>>> No IPR declarations have been submitted directly on this I-D. >>>>> >>>>> >>>>> The document contains these normative downward references. >>>>> See RFC 3967 for additional information: >>>>> rfc6819: OAuth 2.0 Threat Model and Security Considerations >>>>> (Informational - IETF stream) >>>>> draft-recordon-oauth-v2-device: OAuth 2.0 Device Profile >>>>> (None - ) >>>>> rfc6755: An IETF URN Sub-Namespace for OAuth (Informational - IETF >>>>> stream) >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> OAuth mailing list >>>>> OAuth@ietf.org >>>>> https://www.ietf.org/mailman/listinfo/oauth >>>>> >>>> >>>> >>>> *CONFIDENTIALITY NOTICE: This email may contain confidential and >>>> privileged material for the sole use of the intended recipient(s). Any >>>> review, use, distribution or disclosure by others is strictly prohibited.. >>>> If you have received this communication in error, please notify the sender >>>> immediately by e-mail and delete the message and any file attachments from >>>> your computer. Thank you.* >>>> >>> >>> >> >> *CONFIDENTIALITY NOTICE: This email may contain confidential and >> privileged material for the sole use of the intended recipient(s). Any >> review, use, distribution or disclosure by others is strictly prohibited... >> If you have received this communication in error, please notify the sender >> immediately by e-mail and delete the message and any file attachments from >> your computer. Thank you.* >> > > > _______________________________________________ > OAuth mailing list > OAuth@ietf.org > https://www.ietf.org/mailman/listinfo/oauth > > -- _CONFIDENTIALITY NOTICE: This email may contain confidential and privileged material for the sole use of the intended recipient(s). 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