Actually we'd want to do that step after authentication and before
authorization.

Hubert


On Fri, Apr 24, 2009 at 3:41 PM, Hubert Le Van Gong <[email protected]> wrote:
> Great discussion!
>
> If I'm correct we'd be OK if, during the authorization step, SP could get a
> confirmation that the user whom has just authenticated is the same than
> the one that triggered the 1st step at the Consumer (request token retrieval).
>
> How about something like:
>
> - Since in the std 3-legged scenario, the user logs in before the request for
>  the request token is performed, the Consumer could maintain a mapping
>  between the user's ID and the request token.
>
> - We could then add a "confirmation step" just after the authorization one
>  (before redirecting to the callback URL) where
>  the SP redirects the UA (along with the request token) to the Consumer
>  so that the latter can verify the mapping. If the user has an
> existing authenticated
>  session (at the Consumer) then this can be transparent. If not the user
>  authenticates. In both case the Consumer can then check that the
>  current user corresponds to the one in its mapping table.
>
> I realize it requires an extra step but, lacking identity federation, that's 
> the
> only thing I can think of...
>
> HTH
> Hubert
>

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