[Openid-specs-fapi] JWT Secured Authorization Response Mode (#155)

Brian Campbell bcampbell at pingidentity.com
Fri Aug 17 17:24:49 UTC 2018

Yeah, I think that captures the general processing flow.

On Fri, Aug 17, 2018 at 8:50 AM Torsten Lodderstedt <torsten at lodderstedt.net>

> Hi Brian,
> > Am 17.08.2018 um 15:39 schrieb Brian Campbell <
> bcampbell at pingidentity.com>:
> >
> > Good point. OIDC Core (
> http://openid.net/specs/openid-connect-core-1_0.html#Security) does not
> discuss this attack angle. From your perspective, what is the typical way
> to detect crafted/modified ID Tokens in the id_token flow?
> >
> >  Checking the signature. But if the issuer isn't known or expected,
> don't go trying to find keys for it, just reject the token.
> I would like to summarize the discussion regarding handling of state value
> and response processing.
> From what I understand, the processing would work as follows (assuming the
> „state" is carried in the JWT):
> 1) decrypt JWT using the client's private key - the key is determine by
> the „kid“ header parameter
> 2) obtain „state“ from JWT
> 3) check binding of state value to user agent, if check fails - abort
> processing
> 4) obtain „iss" from JWT
> 5) check whether „iss" is known and expected („aud“ could be checked in
> this step as well), if not abort processing
> 6) obtain signing key based on „iss“ and „kid"
> 7) check signature, if signature validation fails - abort processing
> 8) use response parameters
> Does this capture your thoughts correctly?
> Kind regards,
> Torsten.

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