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Re: [OAUTH-WG] [UNVERIFIED SENDER] RE: Cryptographic hygiene and the limits of jwks_uri

"Manger, James" <James.H.Manger@team.telstra.com> Wed, 29 January 2020 06:50 UTC

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From: "Manger, James" <James.H.Manger@team.telstra.com>
To: "oauth@ietf.org" <oauth@ietf.org>
Thread-Topic: [OAUTH-WG] [UNVERIFIED SENDER] RE: Cryptographic hygiene and the limits of jwks_uri
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Date: Wed, 29 Jan 2020 06:50:06 +0000
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Subject: Re: [OAUTH-WG] [UNVERIFIED SENDER] RE: Cryptographic hygiene and the limits of jwks_uri
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>> It would’ve been nice if JWK could’ve agreed on a URL-based 
>> addressing format for individual keys within the set, but that ship’s sailed.

Using the fragment on a JWKS URL to indicate the key id would be good.
Then a single URL by itself can identify a specific key.

https://example.com/keys.jwks#2011-04-29

This would have worked particularly well if a JWKS was a JSON object with key-ids as the member names, instead of an array. That is presumably too late to fix. But defining the fragment format for application/jwk-set+json to be a kid value should be possible.

If you put multiple keys with the same key-id in a JWKS you are asking for trouble -- just call that a non-interoperable corner for people to avoid.

--
James Manger

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