GEOPRIV
Internet Engineering Task Force (IETF)                         R. Bellis
Internet-Draft
Request for Comments: 6915                                    Nominet UK
Updates: RFC 6155 (if approved)                            March 1,                                                 April 2013
Intended status:
Category: Standards Track
Expires: September 2, 2013
ISSN: 2070-1721

   Flow Identity Extension for HELD
                  draft-ietf-geopriv-flow-identity-02 HTTP-Enabled Location Delivery (HELD)

Abstract

   RFC 6155 specifies an extension for the HTTP-Enabled Location
   Delivery (HELD) Protocol protocol, allowing the use of an IP address and port
   number to request a Device location based on an individual packet
   flow.

   However, certain kinds of NAT require that identifiers for both ends
   of the packet flow must be specified in order to unambiguously
   satisfy the location request.

   This document specifies an XML Schema and a URN Sub-Namespace for a
   Flow Identity Extension for HELD to support this requirement.

   This document updates RFC 6155 by deprecating the port number
   elements specified therein.

Status of this This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents an Internet Standards Track document.

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   This Internet-Draft will expire on September 2, 2013.
   http://www.rfc-editor.org/info/rfc6915.

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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Conventions used Used in this document This Document  . . . . . . . . . . . . . .  4  3
   3.  Usage  . . . . . . . . . . . . . . . . . . . . . . . . . . . .  5  4
   4.  XML Schema . . . . . . . . . . . . . . . . . . . . . . . . . .  6  5
   5.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  8  6
     5.1.  URN Sub-Namespace Registration for
           urn:ietf:params:xml:ns:geopriv:held:flow . . . . . . . . .  8  6
     5.2.  XML Schema Registration  . . . . . . . . . . . . . . . . .  8  7
   6.  Privacy Considerations . . . . . . . . . . . . . . . . . . . .  9  7
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . . 10  8
   8.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 11  8
   9.  Notes to the RFC Editor (to be removed)  . . . . . . . . . . . 12
   10.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 13
     10.1.  8
     9.1. Normative References  . . . . . . . . . . . . . . . . . . . 13
     10.2.  8
     9.2. Informative References  . . . . . . . . . . . . . . . . . . 13
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 14  8

1.  Introduction

   Work at the Emergency Location Task Group of NICC Standards Ltd Limited
   (the UK's telecoms industry standards body) prompted the addition of Port
   Number
   port number identifiers in HELD Identity [RFC6155] to allow HELD
   [RFC5985] requests for target Devices that are behind a NAT device. devices.

   Subsequent analysis has determined that in the presence of particular
   types of NAT device, devices, and in particular Carrier Grade NATs, it is
   necessary to know the complete tuple of (layer (Layer 3 protocol, layer Layer 4
   protocol, source address, source port, destination address,
   destination port) in order to unambiguously identify a flow, and
   therefore
   subsequently the true target Device.

   This document specifies an XML Schema and a URN Sub-Namespace for a
   Flow Identity Extension to support this requirement and provides a
   more generally applicable means of identifying a Device based on the
   parameters of a network flow of which it is an endpoint.

   Since the Location Recipient may not know in advance whether the
   Target
   Device is behind a NAT device device, the port number elements from Section
   3.3 of [RFC6155] are deprecated and MUST NOT be used in new client
   implementations.  Note that server implementations of this
   specification may still encounter requests formed by clients that
   have implemented only [RFC6155] [RFC6155], and those requests might contain the
   deprecated port element.

   For implementation details not specified in this document document, please
   refer to [RFC6155] and [RFC5985].

2.  Conventions used Used in this document This Document

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

   The terms "Device" and "Target" are used as defined in [RFC6280].

3.  Usage

   An example HELD request is shown below:

   <locationRequest xmlns="urn:ietf:params:xml:ns:geopriv:held"
                         responseTime="8">
     <locationType exact="true">geodetic</locationType>
     <flow xmlns="urn:ietf:params:xml:ns:geopriv:held:flow"
       layer4="tcp" layer3="ipv4">
       <src>
         <address>192.0.2.25</address>
         <port>1024</port>
       </src>
       <dst>
         <address>198.51.100.238</address>
         <port>80</port>
       </dst>
     </flow>
   </locationRequest>

   The <flow> element MUST contain:

   o  a "layer3" attribute with a value of "ipv4" or "ipv6".

   o  a "layer4" attribute with a value of "udp" [RFC0768], "tcp"
      [RFC0793], "sctp" [RFC4960], "dccp" [RFC4340], or a decimal
      integer representing any applicable protocol from the IANA
      Assigned Internet Protocol Numbers Registry.

   o  a  an <src> element and a <dst> element whose child elements contain
      the layer Layer 3 address (which MUST conform to the relevant
      "IPv4address" or "IPv6address" grammar as defined in [RFC3986])
      and the layer Layer 4 port number of each end of the flow.

   and MAY optionally contain:

   o  a "target" attribute with a value of "src" (default) or "dst" to
      indicate which end of the flow is corresponds to the Target of the
      <locationRequest> with respect to the HELD protocol.

4.  XML Schema

   <?xml version="1.0" encoding="UTF-8"?>
   <xs:schema targetNamespace="urn:ietf:params:xml:ns:geopriv:held:flow"
     xmlns:xs="http://www.w3.org/2001/XMLSchema"
     xmlns:flow="urn:ietf:params:xml:ns:geopriv:held:flow"
     elementFormDefault="qualified">

     <xs:annotation>
       <xs:appinfo
         source="urn:ietf:params:xml:schema:geopriv:held:flow">
         HELD Flow Identity</xs:appinfo>
       <xs:documentation
         source="http://www.rfc-editor.org/rfc/rfcNEW1.txt">
         source="http://www.rfc-editor.org/rfc/rfc6915.txt">
         This document defines Flow Identity elements for HELD.
       </xs:documentation>
     </xs:annotation>

     <xs:element name="flow" type="flow:flowIdentity"/>

     <xs:complexType name="flowIdentity">
       <xs:sequence>
         <xs:element name="src" type="flow:flowEndpoint"/>
         <xs:element name="dst" type="flow:flowEndpoint"/>
       </xs:sequence>
       <xs:attribute name="target" default="src">
         <xs:simpleType>
           <xs:restriction base="xs:token">
             <xs:pattern value="(src|dst)"/>
           </xs:restriction>
         </xs:simpleType>
       </xs:attribute>
       <xs:attribute name="layer3" use="required">
         <xs:simpleType>
           <xs:restriction base="xs:token">
             <xs:pattern value="(ipv4|ipv6)"/>
           </xs:restriction>
         </xs:simpleType>
       </xs:attribute>
       <xs:attribute name="layer4" use="required">
         <xs:simpleType>
           <xs:restriction base="xs:token">
             <xs:pattern value="(udp|tcp|sctp|dccp|\d+)"/>
           </xs:restriction>
         </xs:simpleType>
       </xs:attribute>
     </xs:complexType>
     <xs:complexType name="flowEndpoint">
       <xs:all>
         <xs:element name="address">
           <xs:simpleType>
             <xs:restriction base="xs:token"/>
           </xs:simpleType>
         </xs:element>
         <xs:element name="port">
           <xs:simpleType>
             <xs:restriction base="xs:unsignedShort">
               <xs:minInclusive value="1"/>
             </xs:restriction>
           </xs:simpleType>
         </xs:element>
       </xs:all>
     </xs:complexType>
   </xs:schema>

5.  IANA Considerations

5.1.  URN Sub-Namespace Registration for
      urn:ietf:params:xml:ns:geopriv:held:flow

   This section registers a new XML namespace,
   "urn:ietf:params:xml:ns:geopriv:held:flow", as per the guidelines in
   [RFC3688].

   URI: urn:ietf:params:xml:ns:geopriv:held:flow

   Registrant Contact: IETF GEOPRIV Working Group (geopriv@ietf.org),
   Ray Bellis (ray.bellis@nominet.org.uk)
   XML:

   BEGIN
     <?xml version="1.0"?>
     <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
       "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
     <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
       <head>
         <title>HELD Flow Identity Parameters</title>
       </head>
       <body>
         <h1>Namespace for HELD Flow Identity Parameters</h1>
         <h2>urn:ietf:params:xml:ns:geopriv:held:flow</h2>
         <p>See <a href="http://www.rfc-editor.org/rfc/rfcNEW1.txt"> href="http://www.rfc-editor.org/rfc/rfc6915.txt">
            RFC NEW1</a>.</p> 6915</a>.</p>
       </body>
     </html>
   END

5.2.  XML Schema Registration

   This section registers an XML schema Schema as per the guidelines in
   [RFC3688]
   [RFC3688].

   URI: urn:ietf:params:xml:ns:geopriv:held:flow

   Registrant Contact: IETF GEOPRIV Working Group (geopriv@ietf.org),
   Ray Bellis (ray.bellis@nominet.org.uk)

   Schema: The XML for this schema can be found as the entirety of
   Section 4 of this document.

6.  Privacy Considerations

   All of the considerations in [RFC6155] apply to the use of the
   mechanism defined in this document.  Like [RFC6155], this
   specification assumes that the Location Server being queried already
   has access to the internal state of the network near one end of the
   flow being queried (for instance, access to the bindings in a NAT in
   the path of the flow).  Clients making queries using this
   specification in environments where that assumption may not be true
   should be aware that the request provides information about that
   client's communications that the Location Server would not otherwise
   be able to discern and may represent additional privacy exposure for
   that client.

7.  Security Considerations

   This document introduces no new security considerations beyond those
   in [RFC6155] [RFC6155].

8.  Acknowledgements

   The author wishes to thank the members of the NICC Emergency Location
   Task Group, the IETF GeoPriv Working Group, and the authors of
   [RFC6155], from which the text for the URN and XML Schema
   Registrations were derived.

9.  Notes to the RFC Editor (to be removed)

   References to "NEW1" need to be replaced with this document's final
   RFC number.

10.  References

10.1.

9.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC3688]  Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
              January 2004.

   [RFC3986]  Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
              Resource Identifier (URI): Generic Syntax", STD 66, RFC
              3986, January 2005.

   [RFC5985]  Barnes, M., "HTTP-Enabled Location Delivery (HELD)", RFC
              5985, September 2010.

   [RFC6155]  Winterbottom, J., Thomson, M., Tschofenig, H., and R.
              Barnes, "Use of Device Identity in HTTP-Enabled Location
              Delivery (HELD)", RFC 6155, March 2011.

10.2.

9.2.  Informative References

   [RFC0768]  Postel, J., "User Datagram Protocol", STD 6, RFC 768,
              August 1980.

   [RFC0793]  Postel, J., "Transmission Control Protocol", STD 7, RFC
              793, September 1981.

   [RFC4340]  Kohler, E., Handley, M., and S. Floyd, "Datagram
              Congestion Control Protocol (DCCP)", RFC 4340, March 2006.

   [RFC4960]  Stewart, R., "Stream Control Transmission Protocol", RFC
              4960, September 2007.

   [RFC6280]  Barnes, R., Lepinski, M., Cooper, A., Morris, J.,
              Tschofenig, H., and H. Schulzrinne, "An Architecture for
              Location and Location Privacy in Internet Applications",
              BCP 160, RFC 6280, July 2011.

Author's Address

   Ray Bellis
   Nominet UK
   Edmund Halley Road
   Oxford  OX4 4DQ
   United Kingdom

   Phone: +44 1865 332211
   Email:
   EMail: ray.bellis@nominet.org.uk
   URI:   http://www.nominet.org.uk/