OCSP Usage for Secure Telephone Identity Certificates
draft-ietf-stir-certificates-ocsp-00

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Last updated 2017-03-13
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Network Working Group                                        J. Peterson
Internet-Draft                                                   Neustar
Intended status: Standards Track                               S. Turner
Expires: September 14, 2017                                        sn3rd
                                                          March 13, 2017

         OCSP Usage for Secure Telephone Identity Certificates
                draft-ietf-stir-certificates-ocsp-00.txt

Abstract

   When certificates are used as credentials to attest the assignment or
   ownership of telephone numbers, some mechanism is required to convey
   certificate freshness to relying parties.  This document specifies
   the use of the Online Certificate Status Protocol (OCSP) as a means
   of retrieving real-time status information about such certificates,
   defining new extensions to compensate for the dynamism of telephone
   number assignments.

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 http://datatracker.ietf.org/drafts/current/.

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   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 September 14, 2017.

Copyright Notice

   Copyright (c) 2017 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
   (http://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 & Turner      Expires September 14, 2017               [Page 1]
Internet-Draft                 STIR Certs                     March 2017

   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.  Certificate Verification Methods  . . . . . . . . . . . . . .   3
     3.1.  Using OCSP with TN Auth List  . . . . . . . . . . . . . .   4
       3.1.1.  OCSP Extension Specification  . . . . . . . . . . . .   5
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   5.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .   7
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   7
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  10
   Appendix A.  ASN.1 Module . . . . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

1.  Introduction

   The STIR problem statement [RFC7340] discusses many attacks on 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
   [I-D.ietf-stir-certificates] 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 [I-D.ietf-stir-rfc4474bis] to sign
   PASSporT objects [I-D.ietf-stir-passport] carried in a SIP [RFC3261]
   request.

   The STIR certificates document 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
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