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

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Last updated 2019-03-31 (latest revision 2019-03-11)
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Network Working Group                                        J. Peterson
Internet-Draft                                                   Neustar
Intended status: Standards Track                          March 11, 2019
Expires: September 12, 2019

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

Abstract

   The Secure Telephone Identity Revisited (STIR) certificate profile
   provides a way to attest authority over telephone nunbers 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, in cases 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
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

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   time.  It is inappropriate to use Internet-Drafts as reference
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   This Internet-Draft will expire on September 12, 2019.

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
   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

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   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.  Delegation of STIR Certificates . . . . . . . . . . . . . . .   3
     3.1.  Authentication Services Signing with Delegate
           Certificates  . . . . . . . . . . . . . . . . . . . . . .   4
     3.2.  Verification Service Behavior for Delegate Certificate
           Signatures  . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Acquiring Certificate Chains in STIR  . . . . . . . . . . . .   5
   5.  ACME and Delegation . . . . . . . . . . . . . . . . . . . . .   5
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   7.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .   6
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   9.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   6
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     10.1.  Normative References . . . . . . . . . . . . . . . . . .   6
     10.2.  Informative References . . . . . . . . . . . . . . . . .   7
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   9

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 certificate
   authorities in certificates.  This extension provides additional
   information that relying parties can use when validating transactions
   with the certificate.  When a SIP request, for example, arrives at a
   terminating administrative domain, the calling number attested by the
   SIP request can be compared to the TN Authorization List of the
   certificate that signed the PASSporT to determine if the caller is
   authorized to use that calling number.

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