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Versions: 00

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.

   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 https://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 September 25, 2019.








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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
   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
     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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