ACME for Subdomains
draft-friel-acme-subdomains-01
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Network Working Group O. Friel
Internet-Draft R. Barnes
Intended status: Standards Track Cisco
Expires: July 23, 2020 T. Hollebeek
DigiCert
January 20, 2020
ACME for Subdomains
draft-friel-acme-subdomains-01
Abstract
This document outlines how ACME can be used by a client to obtain a
certificate for a subdomain identifier from a certificate authority.
The client has fulfilled a challenge against a parent domain but does
not need to fulfil a challenge against the explicit subdomain as
certificate authority policy allows issuance of the subdomain
certificate without explicit subdomain ownership proof.
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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Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
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 July 23, 2020.
Copyright Notice
Copyright (c) 2020 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
Friel, et al. Expires July 23, 2020 [Page 1]
Internet-Draft ACME-SUBDOMAINS January 2020
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 . . . . . . . . . . . . . . . . . . . . . . . . . 2
3. ACME Workflow and Identifier Requirements . . . . . . . . . . 3
4. ACME Issuance of Subdomain Certificates . . . . . . . . . . . 4
4.1. newOrder and newAuthz Handling . . . . . . . . . . . . . 5
4.2. Examples . . . . . . . . . . . . . . . . . . . . . . . . 6
5. Resource Enhancements . . . . . . . . . . . . . . . . . . . . 7
5.1. Authorization Object . . . . . . . . . . . . . . . . . . 7
5.2. Directory Object Metadata . . . . . . . . . . . . . . . . 8
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 8
6.1. Authorization Object Fields Registry . . . . . . . . . . 8
6.2. Directory Object Metadata Fields Registry . . . . . . . . 8
7. Security Considerations . . . . . . . . . . . . . . . . . . . 8
8. Informative References . . . . . . . . . . . . . . . . . . . 8
Appendix A. CA Browser Forum Baseline Requirements . . . . . . . 9
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 9
1. Introduction
ACME [RFC8555] defines a protocol that a certificate authority (CA)
and an applicant can use to automate the process of domain name
ownership validation and X.509 (PKIX) certificate issuance. This
document outlines how ACME can be used to issue subdomain
certificates, without requiring the ACME client to explicitly fulfil
an ownership challenge against the subdomain identifiers - the ACME
client need only fulfil an ownership challenge against a parent
domain identifier.
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.
The following terms are used in this document:
o CA: Certificate Authority
o CSR: Certificate Signing Request
Friel, et al. Expires July 23, 2020 [Page 2]
Internet-Draft ACME-SUBDOMAINS January 2020
o FQDN: Fully Qualified Domain Name
3. ACME Workflow and Identifier Requirements
A typical ACME workflow for issuance of certificates is as follows:
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