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A Location Dereference Protocol Using HTTP-Enabled Location Delivery (HELD)
RFC 6753

Internet Engineering Task Force (IETF)                   J. Winterbottom
Request for Comments: 6753                                     Commscope
Category: Standards Track                                  H. Tschofenig
ISSN: 2070-1721                                   Nokia Siemens Networks
                                                          H. Schulzrinne
                                                     Columbia University
                                                              M. Thomson
                                                               Microsoft
                                                            October 2012

                 A Location Dereference Protocol Using
                 HTTP-Enabled Location Delivery (HELD)

Abstract

   This document describes how to use the Hypertext Transfer Protocol
   (HTTP) over Transport Layer Security (TLS) as a dereference protocol
   to resolve a reference to a Presence Information Data Format Location
   Object (PIDF-LO).  This document assumes that a Location Recipient
   possesses a URI that can be used in conjunction with the HTTP-Enabled
   Location Delivery (HELD) protocol to request the location of the
   Target.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc6753.

Winterbottom, et al.         Standards Track                    [Page 1]
RFC 6753                   HELD Dereferencing               October 2012

Copyright Notice

   Copyright (c) 2012 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   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.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  HELD Dereference Protocol  . . . . . . . . . . . . . . . . . .  4
     3.1.  HELD Usage Profile . . . . . . . . . . . . . . . . . . . .  4
     3.2.  HTTP GET Behavior  . . . . . . . . . . . . . . . . . . . .  5
   4.  Authorization Models . . . . . . . . . . . . . . . . . . . . .  6
     4.1.  Authorization by Possession  . . . . . . . . . . . . . . .  7
     4.2.  Authorization via Access Control . . . . . . . . . . . . .  8
     4.3.  Access Control with HELD Dereference . . . . . . . . . . .  9
   5.  Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . 13
   7.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 14
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 15
     8.1.  Normative References . . . . . . . . . . . . . . . . . . . 15
     8.2.  Informative References . . . . . . . . . . . . . . . . . . 15
   Appendix A.  GEOPRIV Using Protocol Compliance . . . . . . . . . . 18
   Appendix B.  Compliance to Location Reference Requirements . . . . 21
     B.1.  Requirements for a Location Configuration Protocol . . . . 21
     B.2.  Requirements for a Location Dereference Protocol . . . . . 23

Winterbottom, et al.         Standards Track                    [Page 2]
RFC 6753                   HELD Dereferencing               October 2012

1.  Introduction

   A location URI [RFC5808] identifies a resource that contains the
   location of an entity.  This document specifies how a holder of an
   "http:" or "https:" location URI uses that URI to retrieve location
   information using a subset of HELD functionality or an HTTP GET
   request.

   A location URI can be acquired using a location configuration
   protocol, such as HTTP-Enabled Location Delivery (HELD) [RFC5985] or
   the Dynamic Host Configuration Protocol (DHCP) location URI option
   [DHCP-URI-OPT].

   A Location Recipient that dereferences a location URI acquires

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