Enhanced JWT Claim Constraints for STIR Certificates
draft-ietf-stir-enhance-rfc8226-00
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
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This Internet-Draft will expire on 19 August 2021.
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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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