[Openid-specs-fapi] Verification: non-compliant JWT audience

[Brian Campbell]

I tend to agree with John here. The OB software statement probably
shouldn't have an audience at all or, if it does, some kind of logical
audience for all UK-Open banking participants would be more appropriate.

The jose4j library does allow the ability to override the rules set out in
https://tools.ietf.org/html/rfc7519#section-4.1.3 but the intent is to turn
off the default processing and enable more complex or application specific
audience processing by plugging in customized claim validation in
specialized cases that need it. Although it can be abused, It's not
intended to allow for non compliant behavior.

On Fri, Sep 22, 2017 at 5:50 PM, John Bradley via Openid-specs-fapi <
openid-specs-fapi at lists.openid.net> wrote:

> I guess the other question is if the software statement should have an
> audience.  Nothing in JWT requires on.  Or you could have a logical
> audience for UK-Open banking participants that they could all recognize.
> That would keep other people from accidentally trying to process it.
>
> John B.
>
> On Sep 22, 2017, at 7:53 PM, Pamela Dingle via Openid-specs-fapi <
> openid-specs-fapi at lists.openid.net> wrote:
>
> Hi FAPI'ers,
>
> Can anyone here comment on whether they use or make technology that CANNOT
> override the standard RFC7519 JWT audience validation requirements?
>
> I know that the jose4j library allows the ability to override the rules
> set out in https://tools.ietf.org/html/rfc7519#section-4.1.3 but I don't
> know if that is a common feature of other libraries.  As I read those
> rules, any entity that receives a JWT with an aud claim populated but which
> does not have the entity itself listed as a recipient should reject that
> JWT.
>
> In this case we are talking about validating software statements in a
> dynamic client requests -- if the software statement is generated with an
> audience set to be the client requesting the software statement,
> technically every AS the client tries to post that statement to should
> reject the statement, since the aud claim does not reference them
> directly.  Any opinions on whether at the end of the day this is a serious
> compliance issue (or not), and/or a real problem for implementers (or not)
> would be welcome.
>
> Cheers,
>
> Pamela
>
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