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-03
STIR M. Dolly
Internet-Draft AT&T
Intended status: Standards Track C. Wendt
Expires: April 9, 2021 Comcast
October 06, 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-03
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 April 9, 2021.
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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 . . . . . . . . . . . . . . . . . . 5
7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 5
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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