Internet DRAFT - draft-wicinski-lamps-caa
draft-wicinski-lamps-caa
LAMPS Working Group T. Wicinski
Internet-Draft Salesforce
Updates: 6844 (if approved) March 24, 2019
Intended status: Standards Track
Expires: September 25, 2019
Alternative DNS Certification Authority Authorization (CAA) Resource
Record
draft-wicinski-lamps-caa-00
Abstract
[RFC6844] defines the Certification Authority Authorization (CAA) DNS
Resource Record type to specify one or more Certification Authorities
(CAs) authorized to issue certificates for that domain name. With
large domains covering multiple web properties, defining all possible
certificate authorities for the domain has security implications. It
would be beneficial to define a CAA for individual host names. This
will allow CAA records that can be managed with fine grain control.
This document provides an alternative CAA record using a _caa prefix
label that will take precedent on a per Fully Qualified Domain Name
(FQDN), if it exists. It will override any CAA record at the zone
apex. This will not change current CAA record behavior, but will be
an additional option.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on September 25, 2019.
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Copyright Notice
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Definitions . . . . . . . . . . . . . . . . . . . . . . . 2
2. The _caa prefix label . . . . . . . . . . . . . . . . . . . . 2
3. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3
4. Normative References . . . . . . . . . . . . . . . . . . . . 3
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 3
1. Introduction
In [RFC6844] the Certification Authority Authorization (CAA) DNS
Resource Record is defined to allow a DNS domain name holder to
specify the Certification Authorities (CAs) authorized to issue
certificates for that domain name.
1.1. Definitions
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.
2. The _caa prefix label
[_caa.www.example.com CAA 0 issue "ca.example.net"
_caa.www.example.com CNAME _caa.cdn.example.net
_]
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3. IANA Considerations
IANA is requested to add an entry in the "Underscored and Globally
Scoped DNS Node Names" Registry with the fields "RR Type" = "CAA" and
"Node Name" = "_caa",
4. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>.
[RFC6844] Hallam-Baker, P. and R. Stradling, "DNS Certification
Authority Authorization (CAA) Resource Record", RFC 6844,
DOI 10.17487/RFC6844, January 2013,
<https://www.rfc-editor.org/info/rfc6844>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/info/rfc8174>.
Author's Address
Tim Wicinski
Salesforce
US
Email: tjw.ietf@gmail.com
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