If you haven't seen this post, it may be of interest
http://hueniverse.com/2009/04/introducing-sign-in-with-twitter-oauth-style-connect/

On Fri, Mar 26, 2010 at 5:20 PM, Paul Lindner <lind...@inuus.com> wrote:

> If a site has an api that returns a stable user identifier then OAuth can
> work fine as an SSO.  I wouldn't go so far as to call it bastardized..
>
> The big difference between OpenID and OAuth is the idiom used.  OpenID is
> designed to not require prior registration for use -- multiple relying
> parties and providers can interoperate using URLs and attribute exchange.
>  With OAuth you need a consumer key/secret for your site, and the APIs for
> attribute exchange change from provider to provider.
>
>
> On Fri, Mar 26, 2010 at 1:39 PM, Chris Messina <chris.mess...@gmail.com>wrote:
>
>> OAuth can be used as a bastardized mechanism to do SSO, but it's not
>> really recommended.
>>
>> OAuth only provides you with tokens, which could later be revoked,
>> effectively destroying the identity that you're relying on.
>>
>> OpenID is the preferred way to achieve SSO because it provides you with a
>> stable, reusable identifier.
>>
>> Twitter uses OAuth for SSO, but it's really kind of a mis-use of the
>> technology, although in practice it kind of solves the problem.
>>
>> Essentially OpenID provides you with identity; OAuth provides you
>> authorization to do things on behalf of a user. Since you're doing something
>> on behalf of a user, you get a kind of temporary identity to do stuff but
>> it's much more fragile than OpenID.
>>
>> Why don't you want to do OpenID?
>>
>> Chris
>>
>>
>> On Fri, Mar 26, 2010 at 10:21 AM, Adam <apcau...@gmail.com> wrote:
>>
>>> We currently use CAS for SSO.  I'd like to have SSO into gmail, but do
>>> not want to switch to OpenID.  Is it possible to use OAuth to login
>>> users into their gmail accounts?  Or is OAuth only meant to retrieve
>>> user data?
>>>
>>> I am currently using SignPost to connect to OAuth... if it matters.
>>>
>>> Thanks.
>>>
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>>
>>
>> --
>> Chris Messina
>> Open Web Advocate, Google
>>
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