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Re: Access Control Requirements

From: Pierre-Antoine Champin <pierre-antoine.champin@liris.cnrs.fr>
Date: Mon, 15 Apr 2013 09:26:26 +0200
Message-ID: <CA+OuRR8_MOb7FJ-QDTjprX0dkU3fajVRfV6ybU5NyXEzyfGp3g@mail.gmail.com>
To: "ashok.malhotra@oracle.com" <ashok.malhotra@oracle.com>
Cc: "public-ldp-wg@w3.org" <public-ldp-wg@w3.org>
Hi Ashok,

On Sun, Apr 14, 2013 at 12:24 PM, Ashok Malhotra

> Access Control is a mechanism to enable or deny permissions to entities -
> individuals, groups of individuals or organizations - to perform operations
> on resources. The entities have to be authenticated and identified
> and, perhaps, added to a group.
> In the case of LDP the resources are LDP resources but the access control
> may operate at different granularities: RDF documents, named graphs or
> individual triples. The operations are read, update, create and delete.
> Access Control will be provided by the storage mechanism and not the LDP
> server itself.

This is a very strong statement, and I'm not sure I agree in the general
All the web applications that I know define their owl ACL above the
underlying RDBMS.


> The access control mechanism isn't in the purview of the LDP standard, so
> what can we say about
> access control?  What can we ask the server to provide?
> 1. How are entities authenticated?   Can we require the use of WebID or
> OpenID for example?
> Can we even recommend that one of these be used?
> LOW BAR:  The storage system provides its own mechanism for authenticating
> and identifying entities e.g
> username/password
> HIGH BAR: Storage system accepts a URL which points to a set of
> credentials identifying entities.  Authorization is orthogonal.
> 2. What is the granularity of access control?
> LOW BAR:  RDF documents
> HIGH BAR: A regex that identifies individual triples
> OTHER REQUIREMENTS .. We can add these with a SHOULD
> 3. If access is denied, some explanation of why it was denied.  For
> example, "Could not verify one of user's principals" or "Network problem
> during authentication" or "User not authorized to update"
> 4. Ability to discover the access control policy
> --
> All the best, Ashok
Received on Monday, 15 April 2013 07:26:59 UTC

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