Short-Lived Certificates for Secure Telephone Identity
draft-peterson-stir-certificates-shortlived-02

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Last updated 2018-03-05
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Network Working Group                                        J. Peterson
Internet-Draft                                                   Neustar
Intended status: Standards Track                           March 5, 2018
Expires: September 6, 2018

         Short-Lived Certificates for Secure Telephone Identity
           draft-peterson-stir-certificates-shortlived-02.txt

Abstract

   When certificates are used as credentials to attest the assignment of
   ownership of telephone numbers, some mechanism is required to provide
   certificate freshness.  This document specifies short-lived
   certificates as a means of guaranteeing certificate freshness for
   secure telephone identity (STIR), in particular relying on the
   Automated Certificate Management Environment (ACME) to allow signers
   to acquire certifcates as needed.

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
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   This Internet-Draft will expire on September 6, 2018.

Copyright Notice

   Copyright (c) 2018 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
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   include Simplified BSD License text as described in Section 4.e of

Peterson                Expires September 6, 2018               [Page 1]
Internet-Draft              STIR Certs Short                  March 2018

   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.  Short-lived certificates for STIR . . . . . . . . . . . . . .   3
   4.  Certificate Acquisition with ACME . . . . . . . . . . . . . .   4
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   6.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .   6
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   8.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   6
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  10

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 [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 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
   Authorization List of the certificate that signed the request to
   determine if the caller is authorized to use that calling number in
   SIP.

   No specific recommendation is made in the STIR certificates document
   for a means of determining the freshness of certificates with a TN
   Authorization List.  This document explores how short-lived
   certificates could be used as a means of preserving that freshness.
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