Review of Proposed Implementer’s Draft of OpenID 2.0 to OpenID Connect Migration Specification

[Nat Sakimura]

Thanks Torsten. 

Redirect URI is a defined term in OAuth 2.0 and thus points to the OIDC parameter and not that of OpenID Authentication 2.0. 
Perhaps in the Final, we can add some clarifying statements to avoid the confusion. 

Best, 

Nat

On Sat, 04 Oct 2014 17:11:32 +0200
Torsten Lodderstedt <torsten at lodderstedt.net> wrote:

> Hi Nat,
> 
> Am 24.09.2014 15:49, schrieb Nat Sakimura:
> 
> > ...
> >
> >
> >     "There could be an attack by a malicious RP to obtain the user’s
> >     PPID for another RP to perform identity correlation. To mitigate
> >     the risk, the OP MUST verify that the realm and RP’s Redirect
> > URI matches as per Section 9.2 of OpenID 2.0 [OpenID.2.0]."
> >
> >     I'm not sure what this means. Does it mean the RP's XRDS
> > document must contain the RP’s Redirect URI (a OAuth/OIDC
> > redirect_uri)? If so, is the RP supposed to use a certain service
> > Type or "http://specs.openid.net/auth/2.0/return_to"
> >     <http://specs.openid.net/auth/2.0/return_to>?
> >
> >     Example:
> >     <Service xmlns="xri://$xrd*($v*2.0)">
> >       <Type>http://specs.openid.net/auth/2.0/return_to</Type>
> >       <URI>http://consumer.example.com/return</URI>
> >     </Service>
> >
> >
> > It just means that openid2_realm MUST be (roughly) a substring of 
> > OpenID Connect/OAuth's Redirect URI. No XRDS is involved. Exact
> > rule of the matching is given in Section 9.2 of OpenID 2.0.
> 
> It's probably nitpicking, but the OIDC redirect_uri must be matched 
> using the rules given in Section 9.2 of OpenID 2.0 instead of the
> OpenId 2.0 return_to URI, correct?
> 
> best regards,
> Torsten.
> 
> 


-- 
Nat Sakimura (n-sakimura at nri.co.jp)
Nomura Research Institute, Ltd. 

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