[Openid-specs-mobile-profile] CIBA error response from the Backchannel Authentication Endpoint

Brian Campbell bcampbell at pingidentity.com
Mon Jul 9 19:10:51 UTC 2018


In two places in the Authentication Request Validation section of CIBA,
there is text that says the OpenID Provider MUST return error response per
Section 3.1.2.6 of [OpenID.Core].  However, Section 3.1.2.6 of OpenID.Core
<http://openid.net/specs/openid-connect-core-1_0.html#AuthError> defines
returning errors to the client by redirecting the browser to the client's
redirect_uri. When read literally (and that happens with specs!) the MUST
there is rather  nonsensical because the CIBA Authentication Request is a
direct HTTP POST from the client to the OP/AS.

Those two occurrences should probably be updated to point to the
Authentication Error Response section in CIBA (§11
<https://xml2rfc.tools.ietf.org/cgi-bin/xml2rfc.cgi?Submit=Submit&format=ascii&mode=html&type=ascii&url=https://bitbucket.org/openid/mobile/raw/585e168fcc5d89bbb0e0908ecf2d7498982aac9f/draft-mobile-client-initiated-backchannel-authentication.xml#auth_error_response>
in bitbucket / §6.5
<http://openid.net/specs/openid-connect-modrna-client-initiated-backchannel-authentication-1_0.html#auth_error_response>
in the published version) that better defines errors from the Backchannel
Authentication Endpoint. I rather suspect that's the intent of the draft
and the problematic MUSTs are just an oversight.

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