Enhanced JWT Claim Constraints for STIR Certificates
draft-ietf-stir-enhance-rfc8226-00

Document Type Active Internet-Draft (stir WG)
Author Russ Housley 
Last updated 2021-02-15
Replaces draft-housley-stir-enhance-rfc8226
Stream Internent Engineering Task Force (IETF)
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Network Working Group                                         R. Housley
Internet-Draft                                            Vigil Security
Updates: 8226 (if approved)                             15 February 2021
Intended status: Standards Track                                        
Expires: 19 August 2021

          Enhanced JWT Claim Constraints for STIR Certificates
                   draft-ietf-stir-enhance-rfc8226-00

Abstract

   RFC 8226 provides a certificate extension to constrain the JWT claims
   that can be included in the PASSporT as defined in RFC 8225.  If the
   signer includes a JWT claim outside the constraint boundaries, then
   the recipient will reject the entire PASSporT.  This document defines
   additional ways that the JWT claims can be constrained.

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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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on 19 August 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
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   Please review these documents carefully, as they describe your rights
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Enhanced JWT Claim Constraints Syntax . . . . . . . . . . . .   3
   4.  Usage Examples  . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  Certificate Extension Example . . . . . . . . . . . . . . . .   5
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   7
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Appendix A.  ASN.1 Module . . . . . . . . . . . . . . . . . . . .   8
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   The use of certificates [RFC5280] in establishing authority over
   telephone numbers is described in [RFC8226].

   Section 8 of [RFC8226] provides a certificate extension to constrain
   the JWT claims that can be included in the PASSporT [RFC8225].  If
   the signer includes a JWT claim outside the constraint boundaries,
   then the recipient will reject the entire PASSporT.

   This document defines an enhanced JWTClaimConstraints certificate
   extension, which provides all of the capabilities available in the
   original certificate extension as well as some additional ways to
   constrain the allowable JWT claims.

2.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in
   BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

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3.  Enhanced JWT Claim Constraints Syntax

   Certificate subjects are limited to specific values for PASSporT
   claims with the Enhanced JWT Claim Constraints certificate extension;
   issuers permit all claims by omitting the Enhanced JWT Claim
   Constraints certificate extension from the extension field of the
   certificate [RFC5280].  The certificate extension is non-critical,
   applicable only to end-entity certificates, and defined with ASN.1
   [X.680].  The syntax of the JWT claims in a PASSporT is specified in
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