[Openid-specs-fapi] [EXTERNAL] Re: Duplicate kids in jwks

Brian Campbell bcampbell at pingidentity.com
Fri Jan 17 22:45:11 UTC 2020


That the ticket https://bitbucket.org/openid/connect/issues/1127 indicates
a Component of Core and Milestone of Errata suggests that an erratum change
to specification(s) is intended. So that should be changed.

On Fri, Jan 17, 2020 at 3:02 PM Mike Jones via Openid-specs-fapi <
openid-specs-fapi at lists.openid.net> wrote:

> Filip is correct.  The intent is only to enforce this behavior in
> certified implementations – not to change the specifications.  This is
> being done to increase interoperability.
>
>
>
> There’s lots of cases where we intentionally constrain certified
> implementations beyond what’s strictly required by the specifications to
> increase interoperability.  For instance, the test “(OP-IDToken-kid)
> IDToken has kid [Basic, Implicit, Hybrid]” requires that the ID Token
> always contains a Key ID, even though the Connect spec only requires it
> when there are multiple keys in the JWK Set.  This was done so that it
> could be counted on.
>
>
>
> Likewise, the WG decision to require unique “kid” values goes beyond the
> spec, but eliminates a number of potential errors resulting from odd corner
> cases.  I firmly believe that the working made the right call to enforce
> this in the certification suite.
>
>
>
>                                                           -- Mike
>
>
>
> *From:* Openid-specs-fapi <openid-specs-fapi-bounces at lists.openid.net> *On
> Behalf Of *Filip Skokan via Openid-specs-fapi
> *Sent:* Friday, January 17, 2020 1:42 PM
> *To:* Financial API Working Group List <openid-specs-fapi at lists.openid.net
> >
> *Cc:* Filip Skokan <panva.ip at gmail.com>
> *Subject:* [EXTERNAL] Re: [Openid-specs-fapi] Duplicate kids in jwks
>
>
>
> I don’t think it’s clear whether the intent was an errata or a proposal to
> the WG to further constrain the Connect certification profile.
>
>
>
> I believe we could only do the latter.
>
> Odesláno z iPhonu
>
>
>
> 17. 1. 2020 v 22:05, Brian Campbell via Openid-specs-fapi <
> openid-specs-fapi at lists.openid.net>:
>
> 
>
> For better or worse JOSE allowed for duplicate kids and Connect didn't
> constrain it. So requiring uniqueness is a breaking change that an erratum
> shouldn't be doing. I guess that counts as a negative opinion towards the
> decision in https://bitbucket.org/openid/connect/issues/1127
> <https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbitbucket.org%2Fopenid%2Fconnect%2Fissues%2F1127&data=02%7C01%7CMichael.Jones%40microsoft.com%7C3551ece54c0549a9fb0008d79b962a4e%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637148942095112814&sdata=lqMLz%2BB19FKwQyV4z4m8hWZZ%2FrAJArE6Pd84xfRaBdk%3D&reserved=0>
>
>
>
> On Fri, Jan 17, 2020 at 12:50 AM Joseph Heenan via Openid-specs-fapi <
> openid-specs-fapi at lists.openid.net> wrote:
>
> Hi all,
>
>
>
> I wanted to direct the FAPI working group to this discussion within the
> Connect working group:
>
>
>
> https://bitbucket.org/openid/connect/issues/1127
> <https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbitbucket.org%2Fopenid%2Fconnect%2Fissues%2F1127&data=02%7C01%7CMichael.Jones%40microsoft.com%7C3551ece54c0549a9fb0008d79b962a4e%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637148942095122809&sdata=xOLPeYfXtphZIKATqdr6Qun9LLSkZrWWL0G2JdTsC8Q%3D&reserved=0>
>
>
>
> Namely that duplicate kids are not permitted in JWKS.
>
>
>
> A test for this was recently added to all the conformance tests, which
> caused one of the UK banks to opine:
>
>
>
> it is valid for the JWK endpoint to return multiple KID instances, one for
> each ‘alg’ supported?
> The spec calls for the alg PS256 or longer to be supported, so we also
> have (for instance) PS384, PS512. And although we may show a couple that we
> don’t need, my point is that it must be valid to show multiple key entries
> to support multiple valid alg values.
>
>
>
> To some extent this seems a reasonable point, reusing a key across across
> two algs that can use the same key seems ok, and arguably perhaps better
> than having the key once without an ‘alg’ specified.
>
>
>
> As this affects the FAPI certification tests, I wanted to check the FAPI
> WG agrees with the decision in
> https://bitbucket.org/openid/connect/issues/1127
> <https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbitbucket.org%2Fopenid%2Fconnect%2Fissues%2F1127&data=02%7C01%7CMichael.Jones%40microsoft.com%7C3551ece54c0549a9fb0008d79b962a4e%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637148942095132801&sdata=V8UtOzKQhIeFFBnhGyaRUWQn1nLqGhTrIAm7vQakV1o%3D&reserved=0> -
> any opinions (positive & negative) would be great please.
>
>
>
> Thanks
>
>
>
> Joseph Heenan
>
> OpenID Certification Team
>
>
>
>
>
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