<div dir="ltr">You know on second thought, perhaps OAuth is appropriate. The 'protected resource' in this case is my membership status. And while creating my account at the RP, I can check a box saying "you may check my membership at org xyz", which will cue the RP that it's worthwhile to redirect me to that site using OAuth to verify membership.<br>
<br><div class="gmail_quote">On Mon, Sep 15, 2008 at 5:44 PM, Andrew Arnott <span dir="ltr"><<a href="mailto:andrewarnott@gmail.com">andrewarnott@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div dir="ltr">That's sounding like what I was hoping existed.<div><br></div><div>Now, since I'm hoping to separate authentication from this membership test, and if I didn't want my membership in Org XYZ to be public knowledge, from a user's perspective it seems the only way to get this to work would be this:</div>
<div><ol><li>I log into RP using an Identifier of my choice, and an asserting OP of my choice</li><li>The RP is interested in my membership in Org XYZ, so it asks Org XYZ if my Identifier is a member of the org.</li><li>
Similar to OpenID OP's list of sites I trust, Org XYZ checks if the requesting RP is trusted by me. If it is, then it just answers yes. If not, it tells the RP to take the long route.</li>
<li>The long route would be the RP redirecting me to Org XYZ to go to a page where I would grant permission for the RP to find out that I am a member.</li><li>The redirect (like OpenId) would tell the RP that I am in a confirmable way.</li>
</ol><div>Blah, that sounds way just like the org being an OP. So maybe for purposes of this investigation we'll just say it can be public knowledge, but confirmable the way Peter just described.</div><div><div></div>
<div class="Wj3C7c"><br><div class="gmail_quote">
On Mon, Sep 15, 2008 at 5:30 PM, Peter Williams <span dir="ltr"><<a href="mailto:pwilliams@rapattoni.com" target="_blank">pwilliams@rapattoni.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Couldn't this be handled by the XRI support, in the openid 2 world?<br>
<br>
Doesn't the XRI resolver allow the organizational claim to be tested?<br>
<br>
XRI essentially has a yellow-pages resolver built in. For any yellow page index, you can resolve a name via that particular naming path. The XRI resolver thus tests that one is listed in a particular "organizational" index, or which there can be n. In trusted XRI, furthermore, the SAML assertions would provide additional proof that the particular resolver listener is authorized to speak for those organizations. In the HXRI trusted resolver variety, the usual trick of the proxy resolver having n*1000 SSL server, one per organization, would be sufficient to know that the listener speaks for the organization (over https)<br>
<div><div></div><div><br>
-----Original Message-----<br>
From: <a href="mailto:general-bounces@openid.net" target="_blank">general-bounces@openid.net</a> [mailto:<a href="mailto:general-bounces@openid.net" target="_blank">general-bounces@openid.net</a>] On Behalf Of Dick Hardt<br>
Sent: Monday, September 15, 2008 5:12 PM<br>
To: Andrew Arnott<br>
Cc: <a href="mailto:general@openid.net" target="_blank">general@openid.net</a><br>
Subject: Re: [OpenID] Too many providers... and here's one reason<br>
<br>
<br>
On 15-Sep-08, at 4:45 PM, Andrew Arnott wrote:<br>
<br>
> I just spoke with an organization that wants to become a Provider so<br>
> that other RP web sites can specifically tell if the logging in user<br>
> is a member of this organization by whether their OpenID Identifier<br>
> was asserted by that org's OP.<br>
><br>
> Ideally, I'd like this org to choose to be an RP instead of an OP<br>
> because there are already too many OPs out there and not enough RPs,<br>
> IMO.<br>
><br>
> How can an RP accept an OpenID Identifier from arbitrary OPs, but at<br>
> each login determine whether the Identifier represents a user who<br>
> belongs to a particular Organization? Basically the Organization<br>
> needs to send an assertion about the Identifier's membership, but<br>
> only be willing to do so if that identifier is confirmed as having<br>
> logged in successfully to that RP. This would be easy to do if that<br>
> Org was an OP, but I'm trying to reduce the # of reasons to be an OP.<br>
<br>
I have envisioned this as a chain of assertions / claims.<br>
<br>
The user has a claim that their identifier is a member of the org.<br>
This claim could be cached or obtained each time it is needed.<br>
<br>
The user then presents that claim (binding identifier to org<br>
membership) and also proves that they control the identifier presented<br>
to the RP.<br>
<br>
InfoCards has this flow speced out ... will be interesting to see if<br>
there is interest in this from the OpenID community, particularly<br>
since this is where the identity protocols really start to<br>
differentiate themselves from existing username/password and form fill.<br>
<br>
-- Dick<br>
<br>
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