STIR Certificate Delegation
draft-ietf-stir-cert-delegation-00

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Network Working Group                                        J. Peterson
Internet-Draft                                                   Neustar
Intended status: Standards Track                            July 8, 2019
Expires: January 9, 2020

                      STIR Certificate Delegation
                 draft-ietf-stir-cert-delegation-00.txt

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 January 9, 2020.

Copyright Notice

   Copyright (c) 2019 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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   (https://trustee.ietf.org/license-info) in effect on the date of
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   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must

Peterson                 Expires January 9, 2020                [Page 1]
Internet-Draft            STIR Cert Delegation                 July 2019

   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 . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Motivation  . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Delegation of STIR Certificates . . . . . . . . . . . . . . .   4
     4.1.  Scope of Delegation . . . . . . . . . . . . . . . . . . .   4
   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  . . . . . . . . . . . . .   8
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   10. Privacy Considerations  . . . . . . . . . . . . . . . . . . .   9
   11. Security Considerations . . . . . . . . . . . . . . . . . . .   9
   12. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   9
   13. References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     13.1.  Normative References . . . . . . . . . . . . . . . . . .   9
     13.2.  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,