Geolocation Policy: A Document Format for Expressing Privacy Preferences for Location Information
RFC 6772

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Internet Engineering Task Force (IETF)               H. Schulzrinne, Ed.
Request for Comments: 6772                           Columbia University
Category: Standards Track                             H. Tschofenig, Ed.
ISSN: 2070-1721                                   Nokia Siemens Networks
                                                              J. Cuellar
                                                                 Siemens
                                                                 J. Polk
                                                                   Cisco
                                                               J. Morris

                                                              M. Thomson
                                                               Microsoft
                                                            January 2013

               Geolocation Policy: A Document Format for
        Expressing Privacy Preferences for Location Information

Abstract

   This document defines an authorization policy language for
   controlling access to location information.  It extends the Common
   Policy authorization framework to provide location-specific access
   control.  More specifically, this document defines condition elements
   specific to location information in order to restrict access to data
   based on the current location of the Target.

   Furthermore, this document defines two algorithms for reducing the
   granularity of returned location information.  The first algorithm is
   defined for usage with civic location information, whereas the other
   one applies to geodetic location information.  Both algorithms come
   with limitations.  There are circumstances where the amount of
   location obfuscation provided is less than what is desired.  These
   algorithms might not be appropriate for all application domains.

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/rfc6772.

Schulzrinne, et al.          Standards Track                    [Page 1]
RFC 6772                   Geolocation Policy               January 2013

Copyright Notice

   Copyright (c) 2013 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.

Schulzrinne, et al.          Standards Track                    [Page 2]
RFC 6772                   Geolocation Policy               January 2013

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  5
   3.  Generic Processing . . . . . . . . . . . . . . . . . . . . . .  7
     3.1.  Structure of Geolocation Authorization Documents . . . . .  7
     3.2.  Rule Transport . . . . . . . . . . . . . . . . . . . . . .  7
   4.  Location-Specific Conditions . . . . . . . . . . . . . . . . .  7
     4.1.  Geodetic Location Condition Profile  . . . . . . . . . . .  8
     4.2.  Civic Location Condition Profile . . . . . . . . . . . . .  9
   5.  Actions  . . . . . . . . . . . . . . . . . . . . . . . . . . .  9
   6.  Transformations  . . . . . . . . . . . . . . . . . . . . . . .  9
     6.1.  Set Retransmission-Allowed . . . . . . . . . . . . . . . .  9
     6.2.  Set Retention-Expiry . . . . . . . . . . . . . . . . . . . 10
     6.3.  Set Note-Well  . . . . . . . . . . . . . . . . . . . . . . 10
     6.4.  Keep Ruleset Reference . . . . . . . . . . . . . . . . . . 10
     6.5.  Provide Location . . . . . . . . . . . . . . . . . . . . . 11
       6.5.1.  Civic Location Profile . . . . . . . . . . . . . . . . 12
       6.5.2.  Geodetic Location Profile  . . . . . . . . . . . . . . 13
   7.  Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
     7.1.  Rule Example with Civic Location Condition . . . . . . . . 15
     7.2.  Rule Example with Geodetic Location Condition  . . . . . . 16
     7.3.  Rule Example with Civic and Geodetic Location Condition  . 17