On Tue, Apr 28, 2009 at 11:00 AM, John Kemp <[email protected]> wrote:
> All of these protocols are for Web-browser based SSO, and establish
> the trust between the consumer and SP (using the OAuth terminology) by
> relying on Web-browser technologies (ie. an HTTP redirect sent through
> the user's browser assures that the browser is the same one at SP as
> it was at consumer).
>
> I do not think the assumptions of OAuth are the same as for those
> protocols. At least not currently. And I would be wary of going that
> way without more thought.

Please give it the thought, then.  This is key.
https://oauth.pbworks.com/OAuth-Session-Fixation-Advisory has a
checklist that may be useful to validate your ideas.

> I think the security requirement is that you ensure that the entity
> making a request to the consumer to start the OAuth process is the
> same entity which is authenticated to the SP. Are you arguing that the
> callback URL suffices in that regard?

It's sufficient for applications that can receive callback URLs.  Both
of the proposals at
https://oauth.pbworks.com/OAuth-Session-Fixation-Advisory rely on the
callback URL.

For apps that can't receive callback URLs, you need a PIN.

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