added pulication ready Access Control Requirements Note
authorArnaud Le Hors <lehors@us.ibm.com>
Mon, 25 Aug 2014 13:02:35 -0700
changeset 762 05e16f9bc70e
parent 761 f682f7a4391d
child 763 ca05b5ece23c
added pulication ready Access Control Requirements Note
TR/NOTE-LDP-ACR-20140825/Overview.html
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+<head>
+    <title>LDP Access Control</title>
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+    
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[email protected] print {
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+</style><link href="https://www.w3.org/StyleSheets/TR/W3C-WG-NOTE" rel="stylesheet"><!--[if lt IE 9]><script src='https://www.w3.org/2008/site/js/html5shiv.js'></script><![endif]--></head>
+  <body id="respecDocument" role="document" class="h-entry"><div id="respecHeader" role="contentinfo" class="head">
+  <p>
+    
+      <a href="http://www.w3.org/"><img src="https://www.w3.org/Icons/w3c_home" alt="W3C" height="48" width="72"></a>
+    
+  </p>
+  <h1 class="title p-name" id="title" property="dcterms:title">LDP Access Control</h1>
+  
+    <h2 property="bibo:subtitle" id="subtitle">Usecases and Requirements for Access Control for the Linked Data Platform</h2>
+  
+  <h2 id="w3c-working-group-note-25-august-2014" property="dcterms:issued" datatype="xsd:dateTime" content="2014-08-25T19:14:30.000Z"><abbr title="World Wide Web Consortium">W3C</abbr> Working Group Note <time class="dt-published" datetime="2014-08-25">25 August 2014</time></h2>
+  <dl>
+    
+      <dt>This version:</dt>
+      <dd><a class="u-url" href="http://www.w3.org/TR/2014/NOTE-LDP-ACR-20140825/">http://www.w3.org/TR/2014/NOTE-LDP-ACR-20140825/</a></dd>
+      <dt>Latest published version:</dt>
+      <dd><a href="http://www.w3.org/TR/LDP-ACR/">http://www.w3.org/TR/LDP-ACR/</a></dd>
+    
+    
+    
+    
+    
+    
+    
+    
+    <dt>Editor:</dt>
+    <dd class="p-author h-card vcard" rel="bibo:editor" inlist=""><span typeof="foaf:Person"><span property="foaf:name" class="p-name fn">Ashok Malhotra</span>, <a rel="foaf:workplaceHomepage" class="p-org org h-org h-card" href="http://www.oracle.com/">Oracle America, Inc.</a>, <span class="ed_mailto"><a class="u-email email" rel="foaf:mbox" href="mailto:[email protected]">[email protected]</a></span></span>
+</dd>
+
+    
+    
+  </dl>
+  
+  
+  
+  
+    
+      <p class="copyright">
+        <a href="http://www.w3.org/Consortium/Legal/ipr-notice#Copyright">Copyright</a> ©
+        2014
+        
+        <a href="http://www.w3.org/"><abbr title="World Wide Web Consortium">W3C</abbr></a><sup>®</sup>
+        (<a href="http://www.csail.mit.edu/"><abbr title="Massachusetts Institute of Technology">MIT</abbr></a>,
+        <a href="http://www.ercim.eu/"><abbr title="European Research Consortium for Informatics and Mathematics">ERCIM</abbr></a>,
+        <a href="http://www.keio.ac.jp/">Keio</a>, <a href="http://ev.buaa.edu.cn/">Beihang</a>), 
+        
+        All Rights Reserved.
+        
+        <abbr title="World Wide Web Consortium">W3C</abbr> <a href="http://www.w3.org/Consortium/Legal/ipr-notice#Legal_Disclaimer">liability</a>,
+        <a href="http://www.w3.org/Consortium/Legal/ipr-notice#W3C_Trademarks">trademark</a> and
+        
+          <a href="http://www.w3.org/Consortium/Legal/copyright-documents">document use</a>
+        
+        rules apply.
+      </p>
+    
+  
+  <hr>
+</div>
+    <section rel="bibo:Chapter" resource="#abstract" typeof="bibo:Chapter" datatype="" property="dcterms:abstract" class="introductory" id="abstract"><h2 id="h2_abstract" role="heading" aria-level="1">Abstract</h2>
+      <p>
+        This note discusses usecases and requirements for Access Control for the 
+		<a href="https://www.w3.org/2012/ldp/wiki/Main_Page">Linked Data Platform WG.</a> 
+		It also outlines a charter for developing a standard for HTTP-based access control. 
+		The work delineated in the charter may be pursued in the Linked Data Platform WG or an independent, related WG. 
+      </p>
+    </section><section rel="bibo:Chapter" resource="#sotd" typeof="bibo:Chapter" id="sotd" class="introductory"><h2 id="h2_sotd" role="heading" aria-level="1">Status of This Document</h2>
+  
+    
+      
+        <p>
+          <em>This section describes the status of this document at the time of its publication.
+          Other documents may supersede this document. A list of current <abbr title="World Wide Web Consortium">W3C</abbr> publications and the
+          latest revision of this technical report can be found in the <a href="http://www.w3.org/TR/"><abbr title="World Wide Web Consortium">W3C</abbr> technical reports index</a> at
+          http://www.w3.org/TR/.</em>
+        </p>
+        
+      <p>
+        While the <a href="https://www.w3.org/2012/ldp/wiki/Main_Page">Linked Data Platform WG.</a> did not 
+		address Access Control directly, a number of usescases and requirements were identified as part of its
+		deliberations.  These usecases and requirements are captured in this document to serve as a basis for 
+		future work.    
+      </p>
+    
+        <p>
+          This document was published by the <a href="https://www.w3.org/2012/ldp/wiki/Main_Page">Linked Data Platform WG</a> as a Working Group Note.
+          
+          
+            If you wish to make comments regarding this document, please send them to 
+            <a href="mailto:[email protected]@w3.org">[email protected]@w3.org</a> 
+            (<a href="mailto:[email protected]@w3.org?subject=subscribe">subscribe</a>,
+            <a href="http://lists.w3.org/Archives/Public/[email protected]/">archives</a>).
+          
+          
+          
+          
+            All comments are welcome.
+          
+        </p>
+        
+        
+          <p>
+            Publication as a Working Group Note does not imply endorsement by the <abbr title="World Wide Web Consortium">W3C</abbr>
+            Membership. This is a draft document and may be updated, replaced or obsoleted by other
+            documents at any time. It is inappropriate to cite this document as other than work in
+            progress.
+          </p>
+        
+        
+        
+        <p>
+          
+            This document was produced by a group operating under the 
+            <a id="sotd_patent" about="" rel="w3p:patentRules" href="http://www.w3.org/Consortium/Patent-Policy-20040205/">5 February 2004 <abbr title="World Wide Web Consortium">W3C</abbr> Patent
+            Policy</a>.
+          
+          
+          
+            
+              <abbr title="World Wide Web Consortium">W3C</abbr> maintains a <a href="" rel="disclosure">public list of any patent
+              disclosures</a> 
+            
+            made in connection with the deliverables of the group; that page also includes
+            instructions for disclosing a patent. An individual who has actual knowledge of a patent
+            which the individual believes contains
+            <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/#def-essential">Essential
+            Claim(s)</a> must disclose the information in accordance with
+            <a href="http://www.w3.org/Consortium/Patent-Policy-20040205/#sec-Disclosure">section
+            6 of the <abbr title="World Wide Web Consortium">W3C</abbr> Patent Policy</a>.
+          
+          
+        </p>
+        
+          <p>This document is governed by the <a id="w3c_process_revision" href="http://www.w3.org/2014/Process-20140801/">1 August 2014 <abbr title="World Wide Web Consortium">W3C</abbr> Process Document</a>.
+          </p>
+        
+        
+      
+    
+  
+</section><section id="toc"><h2 id="h2_toc" role="heading" aria-level="1" class="introductory">Table of Contents</h2><ul id="respecContents" role="directory" class="toc"><li class="tocline"><a class="tocxref" href="#access-control"><span class="secno">1. </span>Access Control</a></li><li class="tocline"><a class="tocxref" href="#terminology"><span class="secno">2. </span>Terminology</a></li><li class="tocline"><a class="tocxref" href="#usecases"><span class="secno">3. </span>Usecases</a><ul class="toc"><li class="tocline"><a class="tocxref" href="#access-control-on-manipulation-of-resources-via-http"><span class="secno">3.1 </span>Access Control on manipulation of resources via HTTP</a></li><li class="tocline"><a class="tocxref" href="#editability-of-access-control-rules-using-http"><span class="secno">3.2 </span>Editability of Access Control Rules using HTTP</a></li><li class="tocline"><a class="tocxref" href="#user-interface-scenarios"><span class="secno">3.3 </span>User Interface Scenarios</a></li><li class="tocline"><a class="tocxref" href="#requirements"><span class="secno">3.4 </span>Requirements</a></li><li class="tocline"><a class="tocxref" href="#outline-of-a-charter-for-a-access-control-wg"><span class="secno">3.5 </span>Outline of a Charter for a Access Control WG</a><ul class="toc"><li class="tocline"><a class="tocxref" href="#deliverables"><span class="secno">3.5.1 </span>Deliverables</a></li></ul></li></ul></li></ul></section>
+    
+    
+    
+    <section id="access-control">
+      <!--OddPage--><h2 id="h2_access-control" role="heading" aria-level="1"><span class="secno">1. </span>Access Control</h2>
+      <p>
+        Access Control is a mechanism through which an agent ( an HTTP server in this case ) permits other agents -- 
+		individuals, organizations, and/or groups made up of these -- to perform certain operations on resources as 
+		specified by policies for the resources and for the agents. Within this document, the resources are LDP resources, but the access 
+		control may operate at different granularities: RDF or other documents, named graphs or individual triples.
+		The operations are typically create, read, update, and delete (CRUD) but other operations can easily be accomodated by
+		this design.
+		</p>
+		<p>
+        When an agent requests a collection of resources it gets to see only those resources or parts of resources 
+		it is authorized for.</p>
+		<p>
+		Depending on the granularity, the access control mechanisms may affect performance, but should not affect 
+		semantics.</p>
+		<p>
+		For access control to come into play, the server must restrict some operations on some resources. 
+		</p>
+		</section>
+		<section id="terminology">
+	  <!--OddPage--><h2 id="h2_terminology" role="heading" aria-level="1"><span class="secno">2. </span>Terminology</h2>
+	  <ul>
+	  <li>ACG: An Access Control Graph describes the permitted modes of access for particular agents to apecific resources.</li>
+	  <li>ACG Resource: A resource whose representation contains one or more ACGs which the server relies 
+	  upon to make access control decisions.</li>
+	  </ul>
+    </section>
+	<section id="usecases">
+	<!--OddPage--><h2 id="h2_usecases" role="heading" aria-level="1"><span class="secno">3. </span>Usecases</h2>
+	<section id="access-control-on-manipulation-of-resources-via-http">
+	<h3 id="h3_access-control-on-manipulation-of-resources-via-http" role="heading" aria-level="2"><span class="secno">3.1 </span>Access Control on manipulation of resources via HTTP</h3>
+	Adam's user agent attempts:
+	<ol>	
+    <li>To CREATE, READ, UPDATE (or PATCH), or DELETE a resource identified by a URL.  The server may immediately 
+	allow or deny the request, or it may request that he authenticate to confirm his privileges, 
+	as specified by the ACG for the Resource.</li>
+    <li>If he is denied access, an explanation of why all or part of his request was denied should be provided 
+	so that it becomes possible to detect errors, and so that he may modify the request -- 
+	potentially to include making a request for such privileges.
+	</li>
+    <li>Adam would ideally like to know whether he will be able to perform an Action on a Resource 
+	before attempting such - i.e., whether he will have to authenticate before he is able to Read or Write the Resource.
+	</li>
+	<ol>
+	</ol></ol></section>
+	<section id="editability-of-access-control-rules-using-http">
+	<h3 id="h3_editability-of-access-control-rules-using-http" role="heading" aria-level="2"><span class="secno">3.2 </span>Editability of Access Control Rules using HTTP</h3>
+	<ol>
+	<li>
+    Bart's user agent logs on to a server and requests
+	the capability to read a group of related resources such as all the papers presented at a conference.</li>
+    
+	<li>Employees with job titles VP or SVP can sign (update) supplier contracts.</li>
+    <li>Charlie, the Webmaster, would like to grant read access to the papers presented at a conference to all the 
+	people who attended the conference.</li>
+	<ol>
+	</ol></ol></section>
+	<section id="user-interface-scenarios">
+	<h3 id="h3_user-interface-scenarios" role="heading" aria-level="2"><span class="secno">3.3 </span>User Interface Scenarios</h3>
+	Eddie's HTTP based user agent would like to provide a user interface to allow, where possible, Eddie to 
+	<ol>
+	<li>Know if he can edit or delete a resource.</li>
+    <li>Know what he would have to do to have access to a resource ( be someone's friend, be part of a club, have 
+	paid a fee )</li>
+	<li>Allow Eddie to edit the access control rules for a resource such as:
+	<ol>
+        <li>Allow friends of his to access a document.</li>
+        <li>Allow friends of his to POST to a container, but only read a subset of the contents of the container, 
+		those posted by that agent for example.</li>
+        <li>Allow all the members of the LDP WG to create and edit resources including LDP Containers under a 
+		specific URL pattern.</li>
+		<li>Allow all friends of friends as expressed by the foaf:knows relations in one's foaf profile to POST comments 
+		to a container related to some content, and edit their own comments.</li>
+		<li>Allow the members of the LDP WG, the RWW CG, the WebID CG, and the member of the European Ontologist Network, 
+		to work together on set of ontologies. It should be possible to drag and drop URLs for these groups, 
+		found on the web, onto the User Interface as a way of creating the union of the members of the group.</li> 
+	</ol>
+	</li></ol>
+	</section>
+	<section id="requirements">
+	<h3 id="h3_requirements" role="heading" aria-level="2"><span class="secno">3.4 </span>Requirements</h3>
+	<ul>
+	<li>An Agent must be able to authenticate itself to a server with an identifier or as the owner of a token. 
+	( All use cases )</li>
+    <li>Ability to specify a collection of agents, identifying agents with URIs, URI patterns, or by description. 
+	(Usecase 3.2.2, 3.2.3)</li>
+    <li>Ability to specify a collection of resources, identified by URIs or URI patterns or by description,
+	with a specified access policy. (Usecase 3.2.1, 3.2.3)</li>
+    <li>Ability to connect a collection of agents with a collection of resources with given access privileges. 
+	( All use cases )</li>
+	</ul>
+	
+	<p>The above requirements require the ability, by an authorized agent, to CREATE, EDIT, UPDATE relevant ACGs. 
+
+	</p><ul>
+	<li>Ability to specify access privileges at a fine-grained level. (Usecase 3.1.2, 3.2.1.2)</li>
+    <li>The server should be able to describe access control policies for a resource. (Usecase 3.1.4, 3.3.1, 3.3.2)</li>
+    <li>The server should be able explain the reasons for access being disallowed in a machine readable format.
+	(Usecase 3.1.3)
+	</li>
+    <li>A user-agent should be able to find the ACG for a given resource.(Usecase 3.1.1)</li>
+	<li>The ability by one user agent to delegate the authority to create and edit ACGs to another agent.(Usecase 3.3.3)</li>
+	</ul>
+	</section>
+	<section id="outline-of-a-charter-for-a-access-control-wg">
+	<h3 id="h3_outline-of-a-charter-for-a-access-control-wg" role="heading" aria-level="2"><span class="secno">3.5 </span>Outline of a Charter for a Access Control WG</h3>
+	<p>An Access Control Graph (ACG) consists of two kinds of collections: a collection of agents and a collection of 
+	resources. It then connects a collection of agents with a collection of resources with the connection identifying 
+	the privileges the agents have on the resources: CREATE, READ, UPDATE, DELETE.</p>
+	<p>ACGs are resources in their own right and can have access control priviledges specified for them just like
+	any other resource.  This permits the creation and modification of ACGs to be delegated.
+	</p>
+	<p>
+	The members of the collection of agents contain tokens that the agents obtain from some authentication service. 
+	The members of the collection of resources are URIs or URI templates.</p>
+	<p>The WG will need to decide whether it also wants to define fine-grained access control at an attribute level.</p>
+<section id="deliverables">
+<h4 id="h4_deliverables" role="heading" aria-level="3"><span class="secno">3.5.1 </span>Deliverables</h4>
+<ul>
+<li>Define the collections that are part of the ACG and define how a collection of agents is connected to a 
+connection of resources.</li>
+<li>Define how ACGs can be created and edited and how these rights can be delegated.</li>
+<li>Describe a proof-of-concept implementation of how a request for access to a resource by an agent can be processed 
+efficiently with the ACG structure defined above.</li>
+</ul> 
+</section>	
+	</section>
+	</section>
+    
+    
+  
+
+</body></html>
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