Re: [OAUTH-WG] OAuth 2.0 and Access Control Lists (ACL)

"Zeltsan, Zachary (Zachary)" <> Mon, 19 December 2011 16:53 UTC

Return-Path: <>
Received: from localhost (localhost []) by (Postfix) with ESMTP id D4DE521F8B57 for <>; Mon, 19 Dec 2011 08:53:50 -0800 (PST)
X-Virus-Scanned: amavisd-new at
X-Spam-Flag: NO
X-Spam-Score: -6.599
X-Spam-Status: No, score=-6.599 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4]
Received: from ([]) by localhost ( []) (amavisd-new, port 10024) with ESMTP id 6+ac4oTZpRPR for <>; Mon, 19 Dec 2011 08:53:50 -0800 (PST)
Received: from ( []) by (Postfix) with ESMTP id 550E121F8A58 for <>; Mon, 19 Dec 2011 08:53:50 -0800 (PST)
Received: from ( []) by (8.13.8/IER-o) with ESMTP id pBJGrmZg012046 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Mon, 19 Dec 2011 10:53:49 -0600 (CST)
Received: from ( []) by (8.14.3/8.14.3/GMO) with ESMTP id pBJGrmks001971 (version=TLSv1/SSLv3 cipher=RC4-MD5 bits=128 verify=NOT); Mon, 19 Dec 2011 10:53:48 -0600
Received: from ([]) by ([]) with mapi; Mon, 19 Dec 2011 10:53:48 -0600
From: "Zeltsan, Zachary (Zachary)" <>
To: 'Melvin Carvalho' <>, "''" <>
Date: Mon, 19 Dec 2011 10:53:45 -0600
Thread-Topic: [OAUTH-WG] OAuth 2.0 and Access Control Lists (ACL)
Thread-Index: Acy9p8pDqKGg01MWTNu5g63yTwKVawAw6PkQ
Message-ID: <>
References: <>
In-Reply-To: <>
Accept-Language: en-US
Content-Language: en-US
acceptlanguage: en-US
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
X-Scanned-By: MIMEDefang 2.57 on
X-Scanned-By: MIMEDefang 2.64 on
Subject: Re: [OAUTH-WG] OAuth 2.0 and Access Control Lists (ACL)
X-Mailman-Version: 2.1.12
Precedence: list
List-Id: OAUTH WG <>
List-Unsubscribe: <>, <>
List-Archive: <>
List-Post: <>
List-Help: <>
List-Subscribe: <>, <>
X-List-Received-Date: Mon, 19 Dec 2011 16:53:50 -0000

The user authentication and access control to the resources is out of the OAuth scope. 
The question is how to make a resource (e.g., a photo) accessible by the authorized clients C1,...,Cn. If each client has obtained a user's authorization for the scopes that include the photo, then all clients' access tokens should enable them to access the photo. If for a client Ci the authorized scope does not include the photo, the client would need get a new user authorization. 

The resource server would be a logical place for maintaining ACL.

-----Original Message-----
From: [] On Behalf Of Melvin Carvalho
Sent: Sunday, December 18, 2011 12:06 PM
Subject: [OAUTH-WG] OAuth 2.0 and Access Control Lists (ACL)

Quick question.  I was wondering if OAuth 2.0 can work with access
control lists.

For example there is a protected resource (e.g. a photo), and I want
to set it up so that a two or more users (for example a group of
friends) U1, U2 ... Un will be able to access it after authenticating.

Is this kind of flow possibly with OAuth 2.0, and if so whose
responsibility is it to maintain the list of agents than can access
the resource?
OAuth mailing list