PASSporT Extension for Resource Priority Authorization
draft-ietf-stir-rph-06

Document Type Active Internet-Draft (stir WG)
Last updated 2018-07-13 (latest revision 2018-05-24)
Replaces draft-singh-stir-rph
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On Agenda stir at IETF-102
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STIR                                                            R. Singh
Internet-Draft                                              Vencore Labs
Intended status: Standards Track                                M. Dolly
Expires: November 25, 2018                                          AT&T
                                                                  S. Das
                                                            Vencore Labs
                                                               A. Nguyen
                                   Office of Emergency Communication/DHS
                                                            May 24, 2018

         PASSporT Extension for Resource Priority Authorization
                         draft-ietf-stir-rph-06

Abstract

   This document extends the PASSporT (Personal Assertion Token)
   specification defined in [RFC8225] to allow the inclusion of
   cryptographically signed assertions of authorization for the values
   populated in the 'Session Initiation Protocol (SIP) Resource-
   Priority' header field, which is used for communications resource
   prioritization.

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
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on November 25, 2018.

Copyright Notice

   Copyright (c) 2018 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
   (https://trustee.ietf.org/license-info) in effect on the date of

Singh, et al.           Expires November 25, 2018               [Page 1]
Internet-Draft                PASSporT-ext                      May 2018

   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  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  PASSporT 'rph' Claim  . . . . . . . . . . . . . . . . . . . .   3
   4.  'rph' in SIP  . . . . . . . . . . . . . . . . . . . . . . . .   5
     4.1.  Authentication Service Behavior . . . . . . . . . . . . .   5
     4.2.  Verification Service Behavior . . . . . . . . . . . . . .   5
   5.  Further Information Associated with 'Resource-Priority' . . .   6
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
     6.1.  JSON Web Token Claims . . . . . . . . . . . . . . . . . .   6
     6.2.  PASSporT Types  . . . . . . . . . . . . . . . . . . . . .   7
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
     7.1.  Avoidance of replay and cut and paste attacks . . . . . .   7
     7.2.  Solution Considerations . . . . . . . . . . . . . . . . .   7
     7.3.  Acknowledgements  . . . . . . . . . . . . . . . . . . . .   8
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   PASSporT [RFC8225] is a token format based on JSON Web Token (JWT)
   [RFC7519] for conveying cryptographically signed information about
   the identities involved in personal communications.  PASSporT with
   STIR [RFC8224] provides a mechanism by which an authority on the
   originating side of a call via a protocol like SIP [RFC3261] can
   provide a cryptographic assurance of the validity of the calling
   party telephone number in order to prevent impersonation attacks.

   [RFC4412] defines the 'SIP Resource-Priority' header field for
   communications 'Resource-Priority'.  As specified in [RFC4412], the
   'SIP Resource-Priority' header field may be used by SIP user agents
   [RFC3261] (including Public Switched Telephone Network (PSTN)
   gateways and SIP proxy servers) to influence prioritization afforded
   to communication sessions including PSTN calls (e.g., to manage
   scarce network resources during network congestion scenarios).
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