[Openid-specs-ab] request_uris parameter of Dynamic Client Registration
mike at gluu.org
Wed Nov 26 18:43:43 UTC 2014
OpenID Connect gurus,
In SAML, an IDP can use the entityID to identify a website, and make a
business decision for a certain attribute release policy. For example,
to entityID "https://example.com/idp" I will release the username and
mail attributes. And of course SAML supports several workflows for
getting the latest metadata for entityID "https://example.com/idp" in
case a new public certificate is required.
So in OpenID Connect, I am wondering what is the equivalent of
"entityID" ? In our first implementation at Gluu, we used clientID as
the entityID, and established trust to a certain clientID. The problem:
OpenID Connect doesn't define a PUT method to update client credentials.
So what to do if your client wants to get a new client secret or update
its public key. Then you need to re-create the attribute release policy
on the OP (and other policies, like supressing authorization in certain
I chatted with John Bradley about this in a past IIW, and he suggested
to perhaps use the "request_uris" parameter:
These request_uris could contain files that would provide the required
information to correlate subsequent client registrations. The OP could
store a SHA-256 hash to detect changes to the files.
My questions are :
1) Is the clientid meant to be a stable identifier of the RP. Or is it
a throw-away identifier to
just represent the clientID at a given time.
2) If clientID is meant to be stable, how would an OP automate trust
and correlate the clients of a partner?
3) Wouldn't it be best for the client to register a 2048 public key
for future correlation, like in many SAML
trust models? Or could this in fact be what one of the request_uris
Am I missing something... as usual?
This issue is pressing for producing RP recommendations on how to
support OpenID Connect. If request_uris is the way to correlate, we
should be recommending every RP to add an optional field for this
Thanks all! And happy Thanksgiving to all the US based people! One thing
we all have to be thankful for is the amazing work of the OpenID Connect
community this year!
Founder / CEO
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