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-02

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Last updated 2020-07-31 (latest revision 2020-07-13)
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: January 14, 2021                                        Comcast
                                                           July 13, 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-02

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

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   This Internet-Draft will expire on January 14, 2021.

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   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Dolly & Wendt           Expires January 14, 2021                [Page 1]
Internet-Draft      RPH Values for Emergency Services          July 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
     3.1.  ESorig  . . . . . . . . . . . . . . . . . . . . . . . . .   3
     3.2.  EScallback  . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  The SIP Priority header "sph" claim . . . . . . . . . . . . .   4
   5.  Order of Claim Keys . . . . . . . . . . . . . . . . . . . . .   5
   6.  Compact Form of PASSporT  . . . . . . . . . . . . . . . . . .   5
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
     7.1.  PASSporT Resource Priority Header (rph) Types . . . . . .   5
     7.2.  JSON Web Token claims . . . . . . . . . . . . . . . . . .   6
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     9.2.  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], which is used for communications
   resource prioritization and the SIP "Priority" header field, used for
   categorizing the priority use of the call.

   Compromise of the SIP "Resource-Priority" header field could lead to
   misuse of network resources (i.e., during congestion scenarios),
   impacting the application services supported using the SIP "Resource-
   Priority" header field.

   [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 fields and convey assertion of those values by the
   signing party authorization.  A signed SIP "Resource-Priority" or
   "Priority" header fields will allow a receiving entity (including
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