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draft-lodderstedt-oauth-revocation.html
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<tbody><tr><td class="header">Open Authentication Protocol</td><td class="header">T. Lodderstedt, Ed.</td></tr>
<tr><td class="header">Internet-Draft</td><td class="header">Deutsche Telekom AG</td></tr>
<tr><td class="header">Intended status: Standards Track</td><td class="header">S. Dronia</td></tr>
<tr><td class="header">Expires: October 2, 2012</td><td class="header">SYRACOM Consulting AG</td></tr>
<tr><td class="header"> </td><td class="header">M. Scurtescu </td></tr>
<tr><td class="header"> </td><td class="header">Google</td></tr>
<tr><td class="header"> </td><td class="header">March 31, 2012</td></tr>
</tbody></table></td></tr></tbody></table>
<h1><br>Token Revocation<br>draft-lodderstedt-oauth-revocation-04</h1>
<h3>Abstract</h3>
<p>This draft proposes an additional endpoint for OAuth authorization servers for revoking tokens.
</p>
<h3>Status of this Memo</h3>
<p>
This Internet-Draft is submitted in full
conformance with the provisions of BCP 78 and BCP 79.</p>
<p>
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current
Internet-Drafts is at http://datatracker.ietf.org/drafts/current/.</p>
<p>
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any time.
It is inappropriate to use Internet-Drafts as reference material or to cite
them other than as “work in progress.”</p>
<p>
This Internet-Draft will expire on October 2, 2012.</p>
<h3>Copyright Notice</h3>
<p>
Copyright (c) 2012 IETF Trust and the persons identified as the
document authors. All rights reserved.</p>
<p>
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.</p>
<a name="toc"></a><br><hr>
<h3>Table of Contents</h3>
<p class="toc">
<a href="file:///C:/Users/tolo/AppData/Local/Temp/xml2rfc-xxe-6233920882813598542.html#Introduction">1.</a>
Introduction<br>
<a href="file:///C:/Users/tolo/AppData/Local/Temp/xml2rfc-xxe-6233920882813598542.html#Revocation">2.</a>
Token Revocation<br>
<a href="file:///C:/Users/tolo/AppData/Local/Temp/xml2rfc-xxe-6233920882813598542.html#JSONP">2.1.</a>
JSONP Support<br>
<a href="file:///C:/Users/tolo/AppData/Local/Temp/xml2rfc-xxe-6233920882813598542.html#Acknowledgements">3.</a>
Acknowledgements<br>
<a href="file:///C:/Users/tolo/AppData/Local/Temp/xml2rfc-xxe-6233920882813598542.html#IANA">4.</a>
IANA Considerations<br>
<a href="file:///C:/Users/tolo/AppData/Local/Temp/xml2rfc-xxe-6233920882813598542.html#Security">5.</a>
Security Considerations<br>
<a href="file:///C:/Users/tolo/AppData/Local/Temp/xml2rfc-xxe-6233920882813598542.html#rfc.references1">6.</a>
References<br>
<a href="file:///C:/Users/tolo/AppData/Local/Temp/xml2rfc-xxe-6233920882813598542.html#rfc.references1">6.1.</a>
Normative References<br>
<a href="file:///C:/Users/tolo/AppData/Local/Temp/xml2rfc-xxe-6233920882813598542.html#rfc.references2">6.2.</a>
Informative References<br>
<a href="file:///C:/Users/tolo/AppData/Local/Temp/xml2rfc-xxe-6233920882813598542.html#rfc.authors">§</a>
Authors' Addresses<br>
</p>
<br clear="all">
<a name="Introduction"></a><br><hr>
<table summary="layout" cellpadding="0" cellspacing="2" class="TOCbug" align="right"><tbody><tr><td class="TOCbug"><a href="file:///C:/Users/tolo/AppData/Local/Temp/xml2rfc-xxe-6233920882813598542.html#toc"> TOC </a></td></tr></tbody></table>
<a name="rfc.section.1"></a><h3>1.
Introduction</h3>
<p>The OAuth 2.0 core specification <a class="info" href="file:///C:/Users/tolo/AppData/Local/Temp/xml2rfc-xxe-6233920882813598542.html#I-D.ietf-oauth-v2">[I‑D.ietf‑oauth‑v2]<span> (</span><span class="info">Hammer-Lahav, E., Recordon, D., and D. Hardt, “The OAuth 2.0 Authorization Protocol,” March 2012.</span><span>)</span></a> defines several ways for a client to obtain refresh and access tokens. This specification supplements the core specification with a mechanism to revoke both types of tokens and facilitates the following use cases:</p>
<ul class="text">
<li>The end-user triggers revocation from within the client that sends the appropriate revocation request to the autorization server. From the end-user's perspective, this looks like a “logout” or “reset” function. The request causes the removal of the client permissions associated with the particular token to access the end-user’s protected resources. This use case makes it even more comfortable to the end-user to revoke his access grant immediately via the client.
</li>
<li>In contrast to revocation by a client, the authorization server (or a related entity) may offer its end-users a self-care portal to delete access grants given to clients independent of any token storing devices. Such a portal offers the possibility to an end-user to look at and revoke all access grants he once authorized. In cases the token storing device is not available, e.g. it is lost or stolen, revocation by a self-care portal is the only possibility to limit or avoid abuse.
</li>
</ul><p> In the end, security, usability, and ease of use are increased by token revocation.
</p>
<p>By using an additional endpoint, the token revocation endpoint, clients can request the revocation of a particular token. Compliant implementation MUST support the revocation of refresh tokens, access token revocation MAY be supported.
</p>
<a name="Revocation"></a><br><hr>
<table summary="layout" cellpadding="0" cellspacing="2" class="TOCbug" align="right"><tbody><tr><td class="TOCbug"><a href="file:///C:/Users/tolo/AppData/Local/Temp/xml2rfc-xxe-6233920882813598542.html#toc"> TOC </a></td></tr></tbody></table>
<a name="rfc.section.2"></a><h3>2.
Token Revocation</h3>
<p>The client requests the revocation of a particular token by making an HTTP POST request to the token revocation endpoint. The location of the token revocation endpoint can be found in the authorization servers documentation. The token endpoint URI MAY include a query component.
</p>
<p>Since requests to the token revocation endpoint result in the transmission of plain text credentials in the HTTP request, the authorization server MUST require the use of a transport-layer security mechanism when sending requests to the token revocation endpoints. The authorization server MUST support TLS 1.0 (<a class="info" href="file:///C:/Users/tolo/AppData/Local/Temp/xml2rfc-xxe-6233920882813598542.html#RFC2246">[RFC2246]<span> (</span><span class="info">Dierks, T. and C. Allen, “The TLS Protocol Version 1.0,” January 1999.</span><span>)</span></a>), SHOULD support TLS 1.2 (<a class="info" href="file:///C:/Users/tolo/AppData/Local/Temp/xml2rfc-xxe-6233920882813598542.html#RFC5246">[RFC5246]<span> (</span><span class="info">Dierks, T. and E. Rescorla, “The Transport Layer Security (TLS) Protocol Version 1.2,” August 2008.</span><span>)</span></a>) and its future replacements, and MAY support additional transport-layer mechanisms meeting its security requirements.
</p>
<p>The client constructs the request by including the following parameters using the "application/x-www-form-urlencoded" format in the HTTP request entity-body: </p>
<blockquote class="text"><dl>
<dt>token</dt>
<dd>REQUIRED. The token that the client wants to get revoked. Note: the authorization server is supposed to detect the token type automatically.
</dd>
</dl></blockquote>
<p>The client also includes its authentication credentials as described in Section 2.3. of <a class="info" href="file:///C:/Users/tolo/AppData/Local/Temp/xml2rfc-xxe-6233920882813598542.html#I-D.ietf-oauth-v2">[I‑D.ietf‑oauth‑v2]<span> (</span><span class="info">Hammer-Lahav, E., Recordon, D., and D. Hardt, “The OAuth 2.0 Authorization Protocol,” March 2012.</span><span>)</span></a>.
</p>
<p>For example, a client may request the revocation of a refresh token with the following request (line breaks are for display purposes only):
</p><div style="display: table; width: 0; margin-left: 3em; margin-right: auto"><pre> POST /revoke HTTP/1.1
Host: server.example.com
Content-Type: application/x-www-form-urlencoded
Authorization: Basic czZCaGRSa3F0MzpnWDFmQmF0M2JW
token=45ghiukldjahdnhzdauz&</pre></div>
<p>The authorization server first validates the client credentials (if present) and verifies whether the client is authorized to revoke the particular token based on the client identity and its policy. For example, only the client the token has been issued for might be allowed to revoke it. It is also conceivable to allow a dedicated user self-care portal to revoke all kinds of tokens.
</p>
<p>In the next step, the authorization server invalidates the token. Whether the revocation takes effect instantly or with some delay depends on the architecture of the particular deployment. The client MUST NOT make any assumptions about the timing and MUST NOT use the token again.
</p>
<p>If the processed token is a refresh token and the authorization server supports the revocation of access tokens, then the authorization server SHOULD also invalidate all access tokens issued for that refresh token.
</p>
<p>The authorization server indicates a successful processing of the request by a HTTP status code 200. Status code 401 indicates a failed client authentication, whereas a status code 403 is used if the client is not authorized to revoke the particular token. For all other error conditions, a status code 400 is used along with an error response as defined in section 5.2. of <a class="info" href="file:///C:/Users/tolo/AppData/Local/Temp/xml2rfc-xxe-6233920882813598542.html#I-D.ietf-oauth-v2">[I‑D.ietf‑oauth‑v2]<span> (</span><span class="info">Hammer-Lahav, E., Recordon, D., and D. Hardt, “The OAuth 2.0 Authorization Protocol,” March 2012.</span><span>)</span></a>. The following error codes are defined for the token revocation endpoint: </p>
<blockquote class="text"><dl>
<dt>unsupported_token_type</dt>
<dd>The authorization server does not support the revocation of the presented token type. I.e. the client tried to revoke an access token on a server not supporting this feature.
</dd>
<dt>invalid_token</dt>
<dd>The presented token is invalid.
</dd>
</dl></blockquote>
<a name="JSONP"></a><br><hr>
<table summary="layout" cellpadding="0" cellspacing="2" class="TOCbug" align="right"><tbody><tr><td class="TOCbug"><a href="file:///C:/Users/tolo/AppData/Local/Temp/xml2rfc-xxe-6233920882813598542.html#toc"> TOC </a></td></tr></tbody></table>
<a name="rfc.section.2.1"></a><h3>2.1.
JSONP Support</h3>
<p>The revocation endpoint MAY support <a class="info" href="file:///C:/Users/tolo/AppData/Local/Temp/xml2rfc-xxe-6233920882813598542.html#jsonp">JSONP<span> (</span><span class="info">Ippolito, B., “Remote JSON - JSONP,” December 2005.</span><span>)</span></a> by allowing GET requests with an additional parameter: </p>
<blockquote class="text"><dl>
<dt>callback</dt>
<dd>The qualified name of a JavaScript function.
</dd>
</dl></blockquote>
<p>Example request:
</p><div style="display: table; width: 0; margin-left: 3em; margin-right: auto"><pre>https://example.com/revoke?token=45ghiukldjahdnhzdauz&
callback=package.myCallback
</pre></div>
<p>Successful response:
</p><div style="display: table; width: 0; margin-left: 3em; margin-right: auto"><pre>package.myCallback();
</pre></div>
<p>Error response:
</p><div style="display: table; width: 0; margin-left: 3em; margin-right: auto"><pre>package.myCallback({"error":"invalid_token"});
</pre></div>
<a name="Acknowledgements"></a><br><hr>
<table summary="layout" cellpadding="0" cellspacing="2" class="TOCbug" align="right"><tbody><tr><td class="TOCbug"><a href="file:///C:/Users/tolo/AppData/Local/Temp/xml2rfc-xxe-6233920882813598542.html#toc"> TOC </a></td></tr></tbody></table>
<a name="rfc.section.3"></a><h3>3.
Acknowledgements</h3>
<p>We would like to thank Sebastian Ebling, Christian Stübner, Brian Campbell, Igor Faynberg, Lukas Rosenstock, and Justin P. Richer for their valuable feedback.
</p>
<a name="IANA"></a><br><hr>
<table summary="layout" cellpadding="0" cellspacing="2" class="TOCbug" align="right"><tbody><tr><td class="TOCbug"><a href="file:///C:/Users/tolo/AppData/Local/Temp/xml2rfc-xxe-6233920882813598542.html#toc"> TOC </a></td></tr></tbody></table>
<a name="rfc.section.4"></a><h3>4.
IANA Considerations</h3>
<p>This draft includes no request to IANA.
</p>
<a name="Security"></a><br><hr>
<table summary="layout" cellpadding="0" cellspacing="2" class="TOCbug" align="right"><tbody><tr><td class="TOCbug"><a href="file:///C:/Users/tolo/AppData/Local/Temp/xml2rfc-xxe-6233920882813598542.html#toc"> TOC </a></td></tr></tbody></table>
<a name="rfc.section.5"></a><h3>5.
Security Considerations</h3>
<p>All relevant security considerations have been given in the functional specification.
</p>
<a name="rfc.references"></a><br><hr>
<table summary="layout" cellpadding="0" cellspacing="2" class="TOCbug" align="right"><tbody><tr><td class="TOCbug"><a href="file:///C:/Users/tolo/AppData/Local/Temp/xml2rfc-xxe-6233920882813598542.html#toc"> TOC </a></td></tr></tbody></table>
<a name="rfc.section.6"></a><h3>6.
References</h3>
<a name="rfc.references1"></a><br><hr>
<table summary="layout" cellpadding="0" cellspacing="2" class="TOCbug" align="right"><tbody><tr><td class="TOCbug"><a href="file:///C:/Users/tolo/AppData/Local/Temp/xml2rfc-xxe-6233920882813598542.html#toc"> TOC </a></td></tr></tbody></table>
<h3>6.1. Normative References</h3>
<table width="99%" border="0">
<tbody><tr><td class="author-text" valign="top"><a name="I-D.ietf-oauth-v2">[I-D.ietf-oauth-v2]</a></td>
<td class="author-text">Hammer-Lahav, E., Recordon, D., and D. Hardt, “<a href="http://tools.ietf.org/html/draft-ietf-oauth-v2-25">The OAuth 2.0 Authorization Protocol</a>,” draft-ietf-oauth-v2-25 (work in progress), March 2012 (<a href="http://www.ietf.org/internet-drafts/draft-ietf-oauth-v2-25.txt">TXT</a>, <a href="http://www.ietf.org/internet-drafts/draft-ietf-oauth-v2-25.pdf">PDF</a>).</td></tr>
<tr><td class="author-text" valign="top"><a name="RFC2119">[RFC2119]</a></td>
<td class="author-text"><a href="mailto:sob@harvard.edu">Bradner, S.</a>, “<a href="http://tools.ietf.org/html/rfc2119">Key words for use in RFCs to Indicate Requirement Levels</a>,” BCP 14, RFC 2119, March 1997 (<a href="http://www.rfc-editor.org/rfc/rfc2119.txt">TXT</a>, <a href="http://xml.resource.org/public/rfc/html/rfc2119.html">HTML</a>, <a href="http://xml.resource.org/public/rfc/xml/rfc2119.xml">XML</a>).</td></tr>
<tr><td class="author-text" valign="top"><a name="RFC2246">[RFC2246]</a></td>
<td class="author-text"><a href="mailto:tdierks@certicom.com">Dierks, T.</a> and <a href="mailto:callen@certicom.com">C. Allen</a>, “<a href="http://tools.ietf.org/html/rfc2246">The TLS Protocol Version 1.0</a>,” RFC 2246, January 1999 (<a href="http://www.rfc-editor.org/rfc/rfc2246.txt">TXT</a>).</td></tr>
<tr><td class="author-text" valign="top"><a name="RFC5246">[RFC5246]</a></td>
<td class="author-text">Dierks, T. and E. Rescorla, “<a href="http://tools.ietf.org/html/rfc5246">The Transport Layer Security (TLS) Protocol Version 1.2</a>,” RFC 5246, August 2008 (<a href="http://www.rfc-editor.org/rfc/rfc5246.txt">TXT</a>).</td></tr>
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<a name="rfc.references2"></a><br><hr>
<table summary="layout" cellpadding="0" cellspacing="2" class="TOCbug" align="right"><tbody><tr><td class="TOCbug"><a href="file:///C:/Users/tolo/AppData/Local/Temp/xml2rfc-xxe-6233920882813598542.html#toc"> TOC </a></td></tr></tbody></table>
<h3>6.2. Informative References</h3>
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<tbody><tr><td class="author-text" valign="top"><a name="jsonp">[jsonp]</a></td>
<td class="author-text">Ippolito, B., “<a href="http://bob.pythonmac.org/archives/2005/12/05/remote-json-jsonp">Remote JSON - JSONP</a>,” December 2005.</td></tr>
</tbody></table>
<a name="rfc.authors"></a><br><hr>
<table summary="layout" cellpadding="0" cellspacing="2" class="TOCbug" align="right"><tbody><tr><td class="TOCbug"><a href="file:///C:/Users/tolo/AppData/Local/Temp/xml2rfc-xxe-6233920882813598542.html#toc"> TOC </a></td></tr></tbody></table>
<h3>Authors' Addresses</h3>
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<tbody><tr><td class="author-text"> </td>
<td class="author-text">Torsten Lodderstedt (editor)</td></tr>
<tr><td class="author-text"> </td>
<td class="author-text">Deutsche Telekom AG</td></tr>
<tr><td class="author" align="right">Email: </td>
<td class="author-text"><a href="mailto:torsten@lodderstedt.net">torsten@lodderstedt.net</a></td></tr>
<tr cellpadding="3"><td> </td><td> </td></tr>
<tr><td class="author-text"> </td>
<td class="author-text">Stefanie Dronia</td></tr>
<tr><td class="author-text"> </td>
<td class="author-text">SYRACOM Consulting AG</td></tr>
<tr><td class="author" align="right">Email: </td>
<td class="author-text"><a href="mailto:sdronia@gmx.de">sdronia@gmx.de</a></td></tr>
<tr cellpadding="3"><td> </td><td> </td></tr>
<tr><td class="author-text"> </td>
<td class="author-text">Marius Scurtescu</td></tr>
<tr><td class="author-text"> </td>
<td class="author-text">Google</td></tr>
<tr><td class="author" align="right">Email: </td>
<td class="author-text"><a href="mailto:mscurtescu@google.com">mscurtescu@google.com</a></td></tr>
</tbody></table>
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