STIR Certificate Delegation
draft-ietf-stir-cert-delegation-04

Document Type Active Internet-Draft (stir WG)
Author Jon Peterson 
Last updated 2021-02-22
Replaces draft-peterson-stir-cert-delegation
Stream Internent Engineering Task Force (IETF)
Intended RFC status Proposed Standard
Formats plain text xml pdf htmlized (tools) htmlized bibtex
Reviews
Stream WG state Submitted to IESG for Publication (wg milestone: - Submit STIR Certific... )
On Agenda stir at IETF-110
Document shepherd Russ Housley
Shepherd write-up Show (last changed 2020-08-05)
IESG IESG state IESG Evaluation::AD Followup
Action Holders
(None)
Consensus Boilerplate Yes
Telechat date
Has a DISCUSS. Has enough positions to pass once DISCUSS positions are resolved.
Responsible AD Murray Kucherawy
Send notices to Russ Housley <housley@vigilsec.com>
IANA IANA review state Version Changed - Review Needed
Network Working Group                                        J. Peterson
Internet-Draft                                                   Neustar
Intended status: Standards Track                       February 21, 2021
Expires: August 25, 2021

                      STIR Certificate Delegation
                   draft-ietf-stir-cert-delegation-04

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

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on August 25, 2021.

Copyright Notice

   Copyright (c) 2021 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

Peterson                 Expires August 25, 2021                [Page 1]
Internet-Draft            STIR Cert Delegation             February 2021

   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 . . . . . . . . . . . . . . . . . . .   5
   5.  Authentication Services Signing with Delegate Certificates  .   6
   6.  Verification Service Behavior for Delegate Certificate
       Signatures  . . . . . . . . . . . . . . . . . . . . . . . . .   7
   7.  Acquiring Multiple Certificates in STIR . . . . . . . . . . .   7
   8.  Certification Authorities and Service Providers . . . . . . .   8
     8.1.  ACME and Delegation . . . . . . . . . . . . . . . . . . .   9
     8.2.  Handling Multiple Certificates  . . . . . . . . . . . . .   9
   9.  Alternative Solutions . . . . . . . . . . . . . . . . . . . .  10
   10. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   11. Privacy Considerations  . . . . . . . . . . . . . . . . . . .  10
   12. Security Considerations . . . . . . . . . . . . . . . . . . .  11
   13. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  11
   14. References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     14.1.  Normative References . . . . . . . . . . . . . . . . . .  12
     14.2.  Informative References . . . . . . . . . . . . . . . . .  13
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  14

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
   [RFC7375].  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
Show full document text