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- </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>
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- <a href="http://www.w3.org/Consortium/Legal/ipr-notice#Copyright">Copyright</a> ©
- 2014
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- <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>),
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- <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">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>.
-
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- <abbr title="World Wide Web Consortium">W3C</abbr> maintains a <a href="" rel="disclosure">public list of any patent
- disclosures</a>
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- 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>
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