OpenID/Oauth hybrid [was Re: specs Digest, Vol 27, Issue 3]

Thu Nov 13 20:58:01 UTC 2008

On Thu, Nov 13, 2008 at 12:46 PM, Allen Tom <atom at yahoo-inc.com> wrote:

>  Hi Yariv,
>
> In the registered consumer case, the SP will need the Consumer Key to show
> the Approval page. Previous versions of the spec had the Request Token in
> the OpenID Authentication request, which allowed the SP to derive the
> Consumer Key from the Request Token. At the IIW, we had discussed somehow
> tying the Association Handle to the Consumer Key.
>
> Regardless of the solution, the SP will need to be know the Consumer Key in
> order to properly identify the OAuth Consumer when displaying the Approval
> page. The OpenID Realm is not quite sufficient, at least for SPs which
> require consumers to pre-register for a CK.
>

I don't think this is true - I believe the realm is sufficient. Let me try
and explain. (We'll assume registered consumers.) On the approval page, we
need to identify the consumer. In its current form, the spec basically
assumes that you're gonna use the realm for that.

Let's assume that The Bad Guy somehow managed to sneak a misleading realm
into a request, i.e. the user sees the realm on the login page and clicks
"approve" when he wouldn't have approved had he known the real identity of
The Bad Guy.

The OP embeds, in the request token, the realm to which the request token
was issued.

Later, when The Bad Guy tries to exchange the request token for an access
token, it won't work, b/c The Bad Guy only has access to his own consumer
secret, which doesn't match the realm embedded in the request token.

So we _do_ have a binding from the request token to the consumer key, it's
just enforced later, not at approval time.

Does this make sense, or am I missing something?

Dirk.

>
> One possible optimization would be to just use the Consumer Key as the
> OpenID Association Handle, and Consumer Secret as the OpenID Association.
> The Consumer can just sign the OpenID Auth request using its CK/CS and the
> OP can return a pre-approved response token in the OpenID assertion. The
> Consumer can then exchange the response token for the OAuth Access Token/
> ATS.
>
> Thoughts?
> Allen
>
>
>
> Yariv Adan wrote:
>
> Following the IIW session on this topic, we updated the spec in
> http://step2.googlecode.com/svn/spec/openid_oauth_extension/drafts/0/openid_oauth_extension.htmlto address the issues that were raised. Especially, optimizing on how OAuth
> request token is handled, allowed to remove one full roundtrip!
> Would appreciate any feedback on the updated suggestion.
>
> Thanks
>
> On Mon, Nov 3, 2008 at 12:00 PM, <specs-request at openid.net> wrote:
>
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>> Today's Topics:
>>
>>   1. Proposal to create the OpenID OAuth Hybrid Working Group
>>      (Yariv Adan)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Mon, 3 Nov 2008 15:30:57 +0100
>> From: Yariv Adan <yariv at google.com>
>> Subject: Proposal to create the OpenID OAuth Hybrid Working Group
>> To: specs at openid.net
>> Message-ID:
>>        <7c1383150811030630r2eaf4e5fxdad6dfbd00cf9010 at mail.gmail.com>
>> Content-Type: text/plain; charset="iso-8859-1"
>>
>>  In accordance with the OpenID Foundation IPR policies and procedures<
>> http://openid.net/foundation/intellectual-property/ > this note proposes
>> the
>> formation of a new working group chartered to produce an OpenID
>> specification.
>> As per Section 4.1 of the Policies, the specifics of the proposed working
>> group are:
>>
>> Background Information:
>> OpenID has always been focused on how to enable user-authentication within
>> the browser.  Over the last year, OAuth has been developed to allow
>> authorization either from within a browser, desktop software, or mobile
>> devices.  Obviously there has been interest in using OpenID and OAuth
>> together allowing a user to share their identity as well as grant a
>> Relying
>> Party access to an OAuth protected resource in a single step.  A small
>> group
>> of people have been working on developing an extension to OpenID which
>> makes
>> this possible in a collaborative fashion within
>> http://code.google.com/p/step2/.  This small project includes a draft
>> spec
>> and Open Source implementations which the proposers would like to finalize
>> within the OpenID Foundation.
>>
>>
>> Working Group Name:
>> OpenID OAuth Hybrid Working Group
>>
>>
>> Purpose:
>> Produce a standard OpenID extension to the OpenID Authentication protocol
>> that provides a mechanism to embed an OAuth approval request into an
>> OpenID
>> authentication request to permit combined user approval. The extension
>> addresses the use case where the OpenID Provider and OAuth Service
>> Provider
>> are the same service. To provide good user experience, it is important to
>> present a combined authentication and authorization screen for the two
>> protocols.
>>
>>
>> Scope:
>> Standardize the draft Hybrid Protocol (
>>
>> http://step2.googlecode.com/svn/spec/openid_oauth_extension/drafts/0/openid_oauth_extension.html
>> )
>> as an official OpenID Extension describing how to combine an OpenID
>> authentication request with the approval of an OAuth request token.
>>
>>
>> Anticipated Contributions:
>> Draft specification referenced above and various text contributions as
>> more
>> developers implement it.
>>
>>
>> Proposed List of Specifications:
>> OpenID OAuth Extension 1.0. Spec completion by Q4 2008.
>>
>>
>> Anticipated audience or users of the work:
>>  - OpenID Providers and Relying Parties
>>  - OAuth Consumers and Service Providers
>>  - Implementers of OpenID Providers and Relying Parties
>>
>>
>> Language in which the WG will conduct business:
>> English.
>>
>>
>> Method of work:
>> E-mail discussions on the working group mailing list and working group
>> conference calls.
>>
>>
>> Basis for determining when the work of the WG is completed:
>> The work will be completed once it is apparent that maximal consensus on
>> the
>> protocol proposal has been achieved within the working group, consistent
>> with the purpose and scope.
>>
>>
>> Proposers:
>>  - Ben Laurie, benl at google.com, Google
>>  - Breno de Medeiros, breno at google.com, Google
>>  - David Recordon, drecordon at sixapart.com, Six Apart
>>  - Dirk Balfanz, balfanz at google.com, Google
>>  - Joseph Smarr, jsmarr at plaxo.com, Plaxo
>>  - Yariv Adan, yariv at google.com, Google  - Allen Tom, atom at yahoo-inc.com,
>> Yahoo
>>  - Josh Hoyt, josh at janrain.com , JanRain
>>
>>
>> Initial Editors:
>>  - Dirk Balfanz, balfanz at google.com, Google  - Breno de Medeiros,
>> breno at google.com, Google
>>
>>
>> --
>> Yariv Adan | Product Manager
>> Google Switzerland GmbH | Identifikationsnummer: CH-020.4.028.116-1
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>
>
>
> --
> Yariv Adan | Product Manager
> Google Switzerland GmbH | Identifikationsnummer: CH-020.4.028.116-1
> This e-mail is confidential. If you are not the right addressee please do
> not forward it, please inform the sender, and please erase this e-mail
> including any attachments. Thanks.
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