Assertion Values for a Resource Priority Header Claim and a SIP Priority Header Claim in Support of Emergency Services Networks
draft-ietf-stir-rph-emergency-services-04

Document Type Active Internet-Draft (stir WG)
Authors Martin Dolly  , Chris Wendt 
Last updated 2020-11-02
Replaces draft-dolly-stir-rph-emergency-services
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STIR                                                            M. Dolly
Internet-Draft                                                      AT&T
Intended status: Standards Track                                C. Wendt
Expires: May 6, 2021                                             Comcast
                                                       November 02, 2020

Assertion Values for a Resource Priority Header Claim and a SIP Priority
         Header Claim in Support of Emergency Services Networks
               draft-ietf-stir-rph-emergency-services-04

Abstract

   This document adds new assertion values for a Resource Priority
   Header ("rph") claim and a new SIP Priority Header claim ("sph") for
   protection of the "psap-callback" value as part of the "rph" PASSporT
   extension, in support of the security of Emergency Services Networks
   for emergency call origination and callback.

Status of This Memo

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

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   This Internet-Draft will expire on May 6, 2021.

Copyright Notice

   Copyright (c) 2020 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
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Dolly & Wendt              Expires May 6, 2021                  [Page 1]
Internet-Draft      RPH Values for Emergency Services      November 2020

   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.  New Assertion Values for "rph" claim  . . . . . . . . . . . .   3
   4.  The SIP Priority header "sph" claim . . . . . . . . . . . . .   4
   5.  Order of Claim Keys . . . . . . . . . . . . . . . . . . . . .   5
   6.  Compact Form of PASSporT  . . . . . . . . . . . . . . . . . .   6
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   6
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
     8.1.  JSON Web Token claims . . . . . . . . . . . . . . . . . .   6
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     10.1.  Normative References . . . . . . . . . . . . . . . . . .   6
     10.2.  Informative References . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   Personal Assertion Token (PASSporT) Extension for Resource Priority
   Authorization [RFC8443] extended the Personal Assertion Token
   (PASSporT) 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 [RFC4412].  [I-D.rosen-stir-emergency-calls]
   introduces the need and justification for the protection of both the
   SIP "Resource-Priority" and "Priority" header fields, used for
   categorizing the priority use of the call in the telephone network,
   specifically for emergency calls.

   Compromise of the SIP "Resource-Priority" or "Priority" header fields
   could lead to misuse of network resources (i.e., during congestion
   scenarios), impacting the application services supported using the
   SIP "Resource-Priority" header field and the handling of Public
   Saftey Answering Point (PSAP) callbacks.

   [RFC8225] allows extensions by which an authority on the originating
   side verifying the authorization of a particular communication for
   the SIP "Resource-Priority" header field or the SIP "Priority" header
   field can use PASSPorT claims to cryptographically sign the
   information associated with either the SIP "Resource-Priority" or
   "Priority" header field and convey assertion of those values by the
   signing party authorization.  A signed SIP "Resource-Priority" or
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