Re: [OAUTH-WG] Issuers, Discovery Docs & Brands

"Manger, James" <James.H.Manger@team.telstra.com> Fri, 05 June 2020 02:23 UTC

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From: "Manger, James" <James.H.Manger@team.telstra.com>
To: Joseph Heenan <joseph@authlete.com>, Francis Pouatcha <fpo=40adorsys.de@dmarc.ietf.org>
CC: Openid-specs-fapi <openid-specs-fapi@lists.openid.net>, OAuth WG <oauth@ietf.org>
Thread-Topic: [OAUTH-WG] Issuers, Discovery Docs & Brands
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Date: Fri, 5 Jun 2020 02:23:15 +0000
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Subject: Re: [OAUTH-WG] Issuers, Discovery Docs & Brands
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Wedging support for multiple Authorization Server brands via this "alternative_authorization_endpoints" metadata field is a very kludgy hack.

> "alternative_authorization_endpoints": {
>    "banking": {
>      "authorization_endpoint": "https://loadsamoney/business/auth",
>      "description": "loadsmoney business banking customers",
>      "logo_url": "https://loadsamoney/business/logo.png"
>    },
>    "personal": {
>      "authorization_endpoint": "https://loadsamoney/consumer/auth",
>      "description": "loadsmoney personal customers",
>      "logo_url": "https://loadsamoney/consumer/logo.png"
>    }
>  }

It assumes only 1 piece of metadata (authorization_endpoint) is brand-specific, but none of the other 50 (eg ui_locales_supported, op_tos_uri, scopes_supported, …) from 4 different specs currently listed in the metadata registry<https://www.iana.org/assignments/oauth-parameters/oauth-parameters.xhtml#authorization-server-metadata> (not to mention the ones in draft specs not registered yet).
It offers 1 logo (in one size/resolution/format/colour-palette/…) and 1 description (in one language), which is likely to be totally inadequate so the suggestion is probably only a fraction of the actual complexity required.


If you want to build a “chooser” user-interface allowing a user to, say, pick between multiple banks & brands then that needs a solution quite distinct from AS metadata.

If you want to allow a client to reuse 1 dynamic registration across multiple brands, could you compare the “registration_endpoint” in each brand’s own AS metadata (being careful a malicious AS cannot trick the client into sharing the client’s creds from a victim AS). Or how about an “associated_issuer” member holding an array of issuer identifiers. If issA & issB each list each other in their “associated_issuer” metadata, then a client registration at either can be used at the other.

If you merely want to trigger a different look-n-feel, define a “brand” parameter to add the to the authorization request.

--
James Manger