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Trustworthy Location
draft-ietf-ecrit-trustworthy-location-13

Document type: Active Internet-Draft (ecrit WG)
Document stream: IETF
Last updated: 2014-06-28
Intended RFC status: Informational
Other versions: plain text, pdf, html

IETF State: Submitted to IESG for Publication
Consensus: Unknown
Document shepherd: Roger Marshall
Shepherd Write-Up: Last changed 2014-02-03

IESG State: IESG Evaluation::AD Followup
IANA Action State: None
(Has enough positions to pass.)
Responsible AD: Alissa Cooper
Send notices to: ecrit-chairs@tools.ietf.org, draft-ietf-ecrit-trustworthy-location@tools.ietf.org

ECRIT Working Group                                        H. Tschofenig
INTERNET-DRAFT                                                  ARM Ltd.
Category: Informational                                   H. Schulzrinne
Expires: December 29, 2014                           Columbia University
                                                          B. Aboba (ed.)
                                                   Microsoft Corporation
                                                            28 June 2014

                          Trustworthy Location
              draft-ietf-ecrit-trustworthy-location-13.txt

Abstract

   The trustworthiness of location information is critically important
   for some location-based applications, such as emergency calling or
   roadside assistance.

   This document describes threats relating to conveyance of location in
   an emergency call, and describes techniques that improve the
   reliability and security of location information conveyed in a IP-
   based emergency service call.  It also provides guidelines for
   assessing the trustworthiness of location information.

Status of This Memo

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

   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/.

   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."

   This Internet-Draft will expire on December 29, 2014.

Tschofenig, et. al            Informational                     [Page 1]
INTERNET-DRAFT            Trustworthy Location              28 June 2014

Copyright Notice

   Copyright (c) 2014 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
     1.1.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  3
     1.2   Emergency Services Architecture  . . . . . . . . . . . . .  5
   2.  Threat Models  . . . . . . . . . . . . . . . . . . . . . . . .  8
     2.1.  Existing Work  . . . . . . . . . . . . . . . . . . . . . .  8
     2.2   Adversary Model  . . . . . . . . . . . . . . . . . . . . .  9
     2.3.  Location Spoofing  . . . . . . . . . . . . . . . . . . . . 10
     2.4.  Identity Spoofing  . . . . . . . . . . . . . . . . . . . . 11
   3.  Mitigation Techniques  . . . . . . . . . . . . . . . . . . . . 11
     3.1.  Signed Location by Value . . . . . . . . . . . . . . . . . 12
     3.2.  Location by Reference  . . . . . . . . . . . . . . . . . . 15
     3.3.  Proxy Adding Location  . . . . . . . . . . . . . . . . . . 18
   4.  Location Trust Assessment  . . . . . . . . . . . . . . . . . . 20
   5.  Security Considerations  . . . . . . . . . . . . . . . . . . . 22
   6.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 24
   7.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 24
     7.1. Informative references  . . . . . . . . . . . . . . . . . . 24
   Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . . . 27
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 27

Tschofenig, et. al            Informational                     [Page 2]
INTERNET-DRAFT            Trustworthy Location              28 June 2014

1.  Introduction

   Several public and commercial services depend upon location
   information in their operations.  This includes emergency services
   (such as fire, ambulance and police) as well as commercial services
   such as food delivery and roadside assistance.

   For circuit-switched calls from landlines, as well as for Voice over
   IP (VoIP) services only supporting emergency service calls from
   stationary devices, location provided to the Public Safety Answering
   Point (PSAP) is determined from a lookup using the calling telephone

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