DNS Certification Authority Authorization (CAA) Resource Record
draft-hoffman-andrews-caa-simplification-02

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Last updated 2017-10-04
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Network Working Group                                    P. Hallam-Baker
Internet-Draft                                              R. Stradling
Obsoletes: RFC 6844 (if approved)                      Comodo Group, Inc
Intended status: Standards Track                      J. Hoffman-Andrews
Expires: April 7, 2018                                     Let's Encrypt
                                                        October 04, 2017

    DNS Certification Authority Authorization (CAA) Resource Record
              draft-hoffman-andrews-caa-simplification-02

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

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   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on April 7, 2018.

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
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   (https://trustee.ietf.org/license-info) in effect on the date of
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   carefully, as they describe your rights and restrictions with respect

Hallam-Baker, et al.      Expires April 7, 2018                 [Page 1]
Internet-Draft                     CAA                      October 2017

   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Definitions . . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
     2.2.  Defined Terms . . . . . . . . . . . . . . . . . . . . . .   4
   3.  The CAA RR Type . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Certification Authority Processing  . . . . . . . . . . . . .   7
     4.1.  Use of DNS Security . . . . . . . . . . . . . . . . . . .   8
   5.  Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . .   9
     5.1.  Syntax  . . . . . . . . . . . . . . . . . . . . . . . . .   9
       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.  Deployment Considerations . . . . . . . . . . . . . . . . . .  14
     7.1.  Blocked Queries or Responses  . . . . . . . . . . . . . .  14
     7.2.  Rejected Queries and Malformed Responses  . . . . . . . .  15
     7.3.  Bogus DNSSEC Responses  . . . . . . . . . . . . . . . . .  15
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  15
     8.1.  Registration of the CAA Resource Record Type  . . . . . .  15
     8.2.  Certification Authority Restriction Properties  . . . . .  16
     8.3.  Certification Authority Restriction Flags . . . . . . . .  16
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  17
   10. Normative References  . . . . . . . . . . . . . . . . . . . .  17
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  18
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