CAA Record Extensions for Account URI and ACME Method Binding
draft-ietf-acme-caa-01
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ACME Working Group H. Landau
Internet-Draft February 04, 2017
Intended status: Standards Track
Expires: August 8, 2017
CAA Record Extensions for Account URI and ACME Method Binding
draft-ietf-acme-caa-01
Abstract
The CAA DNS record allows a domain to communicate issuance policy to
CAs, but only allows a domain to define policy with CA-level
granularity. However, the CAA specification also provides facilities
for extension to admit more granular, CA-specific policy. This
specification defines two such parameters, one allowing specific
accounts of a CA to be identified by URI and one allowing specific
methods of domain control validation as defined by the ACME protocol
to be required.
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
working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/.
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 August 8, 2017.
Copyright Notice
Copyright (c) 2017 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
(http://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
Landau Expires August 8, 2017 [Page 1]
Internet-Draft ACME-CAA February 2017
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. Extensions to the CAA Record: account-uri Parameter . . . . . 3
3.1. Use with ACME . . . . . . . . . . . . . . . . . . . . . . 3
3.2. Use without ACME . . . . . . . . . . . . . . . . . . . . 4
4. Extensions to the CAA Record: acme-methods Parameter . . . . 4
5. Security Considerations . . . . . . . . . . . . . . . . . . . 4
5.1. Limited to CAs Processing CAA Records . . . . . . . . . . 4
5.2. Restrictions Ineffective without CA Recognition . . . . . 5
5.3. Mandatory Consistency in CA Recognition . . . . . . . . . 5
5.4. URI Ambiguity . . . . . . . . . . . . . . . . . . . . . . 6
5.5. Authorization Freshness . . . . . . . . . . . . . . . . . 6
5.6. DNSSEC . . . . . . . . . . . . . . . . . . . . . . . . . 7
5.7. Use without DNSSEC . . . . . . . . . . . . . . . . . . . 7
5.8. Restrictions Supercedable by DNS Delegation . . . . . . . 7
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 8
7. Normative References . . . . . . . . . . . . . . . . . . . . 8
Appendix A. Examples . . . . . . . . . . . . . . . . . . . . . . 8
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 9
1. Introduction
This specification defines two parameters for the "issue" and
"issuewild" properties of the Certification Authority Authorization
(CAA) DNS resource record [RFC6844]. The first, "account-uri",
allows authorization conferred by a CAA policy to be restricted to
specific accounts of a CA, which are identified by URIs. The second,
"acme-methods", allows the set of validation methods supported by an
ACME [I-D.ietf-acme-acme] based CA to validate domain control to be
limited to a subset of the full set of methods which it supports.
2. Terminology
In this document, the key words "MUST", "MUST NOT", "REQUIRED",
"SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY",
and "OPTIONAL" are to be interpreted as described in BCP 14, RFC 2119
[RFC2119] and indicate requirement levels for compliant ACME-CAA
implementations.
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3. Extensions to the CAA Record: account-uri Parameter
A CAA parameter "account-uri" is defined for the "issue" and
"issuewild" properties defined by [RFC6844]. The value of this
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