Re: [OAUTH-WG] Simpilfying use of assertions when requesting an access token

Eran Hammer-Lahav <eran@hueniverse.com> Thu, 02 September 2010 21:27 UTC

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From: Eran Hammer-Lahav <eran@hueniverse.com>
To: Justin Richer <jricher@mitre.org>
Date: Thu, 02 Sep 2010 14:28:20 -0700
Thread-Topic: [OAUTH-WG] Simpilfying use of assertions when requesting an access token
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Cc: "OAuth WG (oauth@ietf.org)" <oauth@ietf.org>
Subject: Re: [OAUTH-WG] Simpilfying use of assertions when requesting an access token
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Yes.

-----Original Message-----
From: Justin Richer [mailto:jricher@mitre.org] 
Sent: Thursday, September 02, 2010 2:27 PM
To: Eran Hammer-Lahav
Cc: OAuth WG (oauth@ietf.org)
Subject: Re: [OAUTH-WG] Simpilfying use of assertions when requesting an access token

+1

I've never liked the notion of not being able to extend the "grant type"
field, and this change addresses that particular gripe.

Just so I'm clear here: an extension that defines its own url-defined grant type can also legally add and remove parameters from the endpoint, right?

 -- Justin

On Thu, 2010-09-02 at 17:11 -0400, Eran Hammer-Lahav wrote:
> I would like to make this change in -11:
> 
>  
> 
> Instead of the current user of the ‘assertion’ grant type –
> 
>  
> 
>   POST /token HTTP/1.1
> 
>   Host: server.example.com
> 
>   Content-Type: application/x-www-form-urlencoded
> 
>   
> 
>   grant_type=assertion&
> 
>   assertion_type=urn%3Aoasis%3Anames%3Atc%3ASAML%3A2.0%3Aassertion&
> 
>   assertion=PHNhbWxwOl[...omitted for brevity...]ZT4%3D
> 
>  
> 
> Drop the ‘assertion’ grant type and put the assertion type directly in 
> the grant_type parameter:
> 
>  
> 
>   POST /token HTTP/1.1
> 
>   Host: server.example.com
> 
>   Content-Type: application/x-www-form-urlencoded
> 
>   
> 
>   grant_type=urn%3Aoasis%3Anames%3Atc%3ASAML%3A2.0%3Aassertion&
> 
>   assertion=PHNhbWxwOl[...omitted for brevity...]ZT4%3D
> 
>  
> 
> In other words, the grant_type parameter value will be defined as:
> 
>  
> 
> -          authorization_code
> 
> -          password
> 
> -          client_credentials
> 
> -          refresh_token
> 
> -          an abolute URI (extensions)
> 
>  
> 
> I considered turning all the values into URIs but found it to be 
> counter-intuitive. The practice of using “official” short names and 
> extension URIs is well established and is already the general 
> architecture used here. This just makes it cleaner.
> 
>  
> 
> I ran this idea by Brian Campbell and Chuck Mortimore who are 
> generally supportive of the idea.
> 
>  
> 
> Any objections?
> 
>  
> 
> EHL
> 
>  
> 
>