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DNS Certification Authority Authorization (CAA) Resource Record
RFC 6844

Internet Engineering Task Force (IETF)                   P. Hallam-Baker
Request for Comments: 6844                            Comodo Group, Inc.
Category: Standards Track                                   R. Stradling
ISSN: 2070-1721                                          Comodo CA, Ltd.
                                                            January 2013

    DNS Certification Authority Authorization (CAA) Resource Record

Abstract

   The Certification Authority Authorization (CAA) DNS Resource Record
   allows a DNS domain name holder to specify one or more Certification
   Authorities (CAs) authorized to issue certificates for that domain.
   CAA Resource Records allow a public Certification Authority to
   implement additional controls to reduce the risk of unintended
   certificate mis-issue.  This document defines the syntax of the CAA
   record and rules for processing CAA records by certificate issuers.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc6844.

Copyright Notice

   Copyright (c) 2013 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
   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.

Hallam-Baker & Stradling     Standards Track                    [Page 1]
RFC 6844          Certification Authority Authorization     January 2013

Table of Contents

   1. Introduction ....................................................2
   2. Definitions .....................................................3
      2.1. Requirements Language ......................................3
      2.2. Defined Terms ..............................................3
   3. The CAA RR Type .................................................5
   4. Certification Authority Processing ..............................7
      4.1. Use of DNS Security ........................................8
   5. Mechanism .......................................................8
      5.1. Syntax .....................................................8
           5.1.1. Canonical Presentation Format ......................10
      5.2. CAA issue Property ........................................10
      5.3. CAA issuewild Property ....................................12
      5.4. CAA iodef Property ........................................12
   6. Security Considerations ........................................13
      6.1. Non-Compliance by Certification Authority .................13
      6.2. Mis-Issue by Authorized Certification Authority ...........13
      6.3. Suppression or Spoofing of CAA Records ....................13
      6.4. Denial of Service .........................................14
      6.5. Abuse of the Critical Flag ................................14
   7. IANA Considerations ............................................14
      7.1. Registration of the CAA Resource Record Type ..............14
      7.2. Certification Authority Restriction Properties ............15
      7.3. Certification Authority Restriction Flags .................15
   8. Acknowledgements ...............................................16
   9. References .....................................................16
      9.1. Normative References ......................................16
      9.2. Informative References ....................................17

1.  Introduction

   The Certification Authority Authorization (CAA) DNS Resource Record
   allows a DNS domain name holder to specify the Certification
   Authorities (CAs) authorized to issue certificates for that domain.
   Publication of CAA Resource Records allows a public Certification
   Authority to implement additional controls to reduce the risk of
   unintended certificate mis-issue.

   Like the TLSA record defined in DNS-Based Authentication of Named

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