[Openid-specs-fapi] External : Re: External : FW: OBE JWS Profile - Version 0.10b for Approval

Freddi Gyara Freddi.Gyara at openbanking.org.uk
Tue Sep 22 08:39:19 UTC 2020


Hi Brian,

Around a year ago at least, must JWT libraries did not honour the ‘b64’ header (they simply ignored it). As a result, we ended up with signatures in the ecosystem where participants thought they were unencoded, but actually were and verification methods where they were trying to verify against un-encoded payloads. As you can imagine, it just caused a lot of confusion.

We paused the implemented under a waiver which expired a few months ago and we are beginning to see very few issues with usage of signatures in the ecosystem (after an initial round of incorrect implementations that have largely been fixed). TBH, payment volumes are low, but increasing and we haven’t seen a similar increase in support tickets or complaints around signature generation and validation.

The approach that is now followed is to b64 encode and sign the HTTP body, then drop the central part of the resulting JWT (as described in Appendix F).

From: Brian Campbell <bcampbell at pingidentity.com>
Sent: 18 September 2020 20:53
To: FAPI Working Group List <openid-specs-fapi at lists.openid.net>
Cc: Chris Michael <Chris.Michael at openbanking.org.uk>; Ralph Bragg (raidiam) <ralph.bragg at raidiam.com>; Freddi Gyara <Freddi.Gyara at openbanking.org.uk>
Subject: External : Re: [Openid-specs-fapi] External : FW: OBE JWS Profile - Version 0.10b for Approval

Apologies for not being up to date on everything but what were the issues with RFC 7797 b64 header? And how do things work without it? Does that mean the http body has to base64url encoded? Or am I misunderstanding something?

On Thu, Sep 17, 2020 at 3:06 AM Freddi Gyara via Openid-specs-fapi <openid-specs-fapi at lists.openid.net<mailto:openid-specs-fapi at lists.openid.net>> wrote:

I want to raise a concern about “REQUIREMENT-2: The JWS header shall include b64 header parameter, as defined in RFC 7797 [3], set to false."

This is a breaking change from the signatures at Open Banking (which explicitly do not use this as we found that library support and interop issues that ensued as a result.

It would be good to understand the rationale for requiring this flag. If this was included to be aligned with OBIE, the situation on the ground has now actually changed.

Requirements in 5.3.2 are also a breaking change for OBIE (we rely on using `kid` alone to identify the signing key).



From: Openid-specs-fapi <openid-specs-fapi-bounces at lists.openid.net<mailto:openid-specs-fapi-bounces at lists.openid.net>> On Behalf Of Ralph Bragg via Openid-specs-fapi
Sent: 16 September 2020 17:43
To: openid-specs-fapi at lists.openid.net<mailto:openid-specs-fapi at lists.openid.net>
Cc: Ralph Bragg (raidiam) <ralph.bragg at raidiam.com<mailto:ralph.bragg at raidiam.com>>
Subject: External : [Openid-specs-fapi] FW: OBE JWS Profile - Version 0.10b for Approval

FYI – speak now or forever hold your peace.

Kind Regads,
Ralph

From: Joao Daniel Parracho <j.parracho at openbankingeurope.eu<mailto:j.parracho at openbankingeurope.eu>>
Date: Wednesday, 16 September 2020 at 17:27
Cc: Nick Pope <nick.pope at openbankingeurope.eu<mailto:nick.pope at openbankingeurope.eu>>, "John Broxis (j.broxis at preta.eu<mailto:j.broxis at preta.eu>)" <j.broxis at preta.eu<mailto:j.broxis at preta.eu>>
Subject: OBE JWS Profile - Version 0.10b for Approval

Dear Colleagues,

OBE is pleased to distribute the OBE JWS Profile version 0.10b for your approval.  This has minor changes from the version 0.0.9 distributed earlier this year as listed in the document “Comments on OBE JWS profile v 0.9” and with specific revisions shown in document “PRETA-OBE-ID-000-010b-OBE JWS- proposed final draft for approval-with revs”.

It is proposed to finalise this approval at a meeting API and ETSI signature format experts on 22nd October at 15:00 CEST.  Can you let us known if you approve or have any remaining concerns with this document at least 1 week before this meeting date?  Also, if you wish to attend the meeting on 22nd October and are unable to make this date please let us know  as soon as possible.

Kind regards,
João
João Parracho
Communications & Engagement Consultant | Open Banking Europe
j.parracho at openbankingeurope.eu<mailto:j.parracho at openbankingeurope.eu>

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