Personal Assertion Token (PASSporT) Extension for Resource Priority Authorization
RFC 8443

Document Type RFC - Proposed Standard (August 2018; No errata)
Last updated 2018-08-31
Replaces draft-singh-stir-rph
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Russ Housley
Shepherd write-up Show (last changed 2018-01-04)
IESG IESG state RFC 8443 (Proposed Standard)
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Send notices to Russ Housley <housley@vigilsec.com>
IANA IANA review state Version Changed - Review Needed
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Internet Engineering Task Force (IETF)                          R. Singh
Request for Comments: 8443                                  Vencore Labs
Category: Standards Track                                       M. Dolly
ISSN: 2070-1721                                                     AT&T
                                                                  S. Das
                                                            Vencore Labs
                                                               A. Nguyen
                                  Office of Emergency Communications/DHS
                                                             August 2018

             Personal Assertion Token (PASSporT) Extension
                  for Resource Priority Authorization

Abstract

   This document extends the Personal Assertion Token (PASSporT)
   specification defined in RFC 8225 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 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 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc8443.

Singh, et al.                Standards Track                    [Page 1]
RFC 8443                      PASSporT-ext                   August 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
   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 . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  PASSporT "rph" Claim  . . . . . . . . . . . . . . . . . . . .   4
   4.  "rph" in SIP  . . . . . . . . . . . . . . . . . . . . . . . .   5
     4.1.  Authentication Service Behavior . . . . . . . . . . . . .   5
     4.2.  Verification Service Behavior . . . . . . . . . . . . . .   6
   5.  Further Information Associated with the SIP
       'Resource-Priority' Header Field  . . . . . . . . . . . . . .   7
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
     6.1.  JSON Web Token Claims . . . . . . . . . . . . . . . . . .   7
     6.2.  PASSporT Types  . . . . . . . . . . . . . . . . . . . . .   7
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
     7.1.  Avoidance of Replay and Cut-and-Paste Attacks . . . . . .   8
     7.2.  Solution Considerations . . . . . . . . . . . . . . . . .   8
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

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
   Secure Telephone Identity Revisited (STIR) [RFC8224] provides a
   mechanism by which an authority on the originating side of a call,
   using 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.

Singh, et al.                Standards Track                    [Page 2]
RFC 8443                      PASSporT-ext                   August 2018

   [RFC4412] defines a mechanism to prioritize access to SIP-signaled
   resources during periods of communications resource scarcity using
   the SIP 'Resource-Priority' header.  As specified in [RFC4412], the
   SIP 'Resource-Priority' header field may be used by SIP user agents
   (UAs) [RFC3261] (including Public Switched Telephone Network (PSTN)
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