STIR Certificate Delegation
draft-ietf-stir-cert-delegation-01
Network Working Group J. Peterson
Internet-Draft Neustar
Intended status: Standards Track November 4, 2019
Expires: May 7, 2020
STIR Certificate Delegation
draft-ietf-stir-cert-delegation-01
Abstract
The Secure Telephone Identity Revisited (STIR) certificate profile
provides a way to attest authority over telephone numbers and related
identifiers for the purpose of preventing telephone number spoofing.
This specification details how that authority can be delegated from a
parent certificate to a subordinate certificate. This supports a
number of use cases, including those where service providers grant
credentials to enterprises or other customers capable of signing
calls with STIR.
Status of This Memo
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This Internet-Draft will expire on May 7, 2020.
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Peterson Expires May 7, 2020 [Page 1]
Internet-Draft STIR Cert Delegation November 2019
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Motivation . . . . . . . . . . . . . . . . . . . . . . . . . 3
4. Delegation of STIR Certificates . . . . . . . . . . . . . . . 4
4.1. Scope of Delegation . . . . . . . . . . . . . . . . . . . 5
5. Authentication Services Signing with Delegate Certificates . 6
6. Verification Service Behavior for Delegate Certificate
Signatures . . . . . . . . . . . . . . . . . . . . . . . . . 6
7. Acquiring Certificate Chains in STIR . . . . . . . . . . . . 7
8. Certification Authorities and Service Providers . . . . . . . 7
8.1. ACME and Delegation . . . . . . . . . . . . . . . . . . . 8
8.2. Handling Multiple Certificates . . . . . . . . . . . . . 9
9. Alternative Solutions . . . . . . . . . . . . . . . . . . . . 9
10. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10
11. Privacy Considerations . . . . . . . . . . . . . . . . . . . 10
12. Security Considerations . . . . . . . . . . . . . . . . . . . 10
13. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 10
14. References . . . . . . . . . . . . . . . . . . . . . . . . . 10
14.1. Normative References . . . . . . . . . . . . . . . . . . 10
14.2. Informative References . . . . . . . . . . . . . . . . . 11
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 12
1. Introduction
The STIR problem statement [RFC7340] reviews the difficulties facing
the telephone network that are enabled by impersonation, including
various forms of robocalling, voicemail hacking, and swatting. One
of the most important components of a system to prevent impersonation
is the implementation of credentials which identify the parties who
control telephone numbers. The STIR certificates [RFC8226]
specification describes a credential system based on [X.509] version
3 certificates in accordance with [RFC5280] for that purpose. Those
credentials can then be used by STIR authentication services
[RFC8224] to sign PASSporT objects [RFC8225] carried in SIP [RFC3261]
requests.
[RFC8226] specifies an extension to X.509 that defines a Telephony
Number (TN) Authorization List that may be included by certification
authorities (CAs) in certificates. This extension provides
additional information that relying parties can use when validating
transactions with the certificate. When a SIP request, for example,
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