ACME for Subdomains
draft-friel-acme-subdomains-00
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Network Working Group O. Friel
Internet-Draft R. Barnes
Intended status: Standards Track Cisco
Expires: April 25, 2020 T. Hollebeek
DigiCert
October 23, 2019
ACME for Subdomains
draft-friel-acme-subdomains-00
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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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 April 25, 2020.
Copyright Notice
Copyright (c) 2019 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 April 25, 2020 [Page 1]
Internet-Draft ACME-SUBDOMAINS October 2019
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. Directory Object Metadata Fields Registry . . . . . . . . . . 7
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7
7. Security Considerations . . . . . . . . . . . . . . . . . . . 8
8. Informative References . . . . . . . . . . . . . . . . . . . 8
Appendix A. CA Browser Forum Baseline Requirements . . . . . . . 8
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 8
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. The
protocol is rich and flexible and enables multiple use cases that are
not immediately obvious from reading the specification.
This document explicitly 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
o FQDN: Fully Qualified Domain Name
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3. ACME Workflow and Identifier Requirements
A typical ACME workflow for issuance of certificates is as follows:
1. client POSTs a newOrder request that contains a set of
"identifiers"
2. server replies with a set of "authorizations" and a "finalize"
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