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+ <title>LDP Access Control</title>
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+ <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:ashok.malhotra@oracle.com">ashok.malhotra@oracle.com</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:public-ldp-comments@w3.org@w3.org">public-ldp-comments@w3.org@w3.org</a>
+ (<a href="mailto:public-ldp-comments@w3.org-request@w3.org?subject=subscribe">subscribe</a>,
+ <a href="http://lists.w3.org/Archives/Public/public-ldp-comments@w3.org/">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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