DNS Certification Authority Authorization (CAA) Resource Record
draft-ietf-lamps-rfc6844bis-03

Document Type Active Internet-Draft (lamps WG)
Last updated 2018-11-06
Replaces draft-hoffman-andrews-caa-simplification
Stream IETF
Intended RFC status Proposed Standard
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Stream WG state Submitted to IESG for Publication
Document shepherd Russ Housley
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Network Working Group                                    P. Hallam-Baker
Internet-Draft                                         Comodo Group, Inc
Obsoletes: 6844 (if approved)                               R. Stradling
Intended status: Standards Track                                 Sectigo
Expires: May 10, 2019                                 J. Hoffman-Andrews
                                                           Let's Encrypt
                                                       November 06, 2018

    DNS Certification Authority Authorization (CAA) Resource Record
                     draft-ietf-lamps-rfc6844bis-03

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.

   This document obsoletes RFC 6844.

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
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   This Internet-Draft will expire on May 10, 2019.

Copyright Notice

   Copyright (c) 2018 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

Hallam-Baker, et al.      Expires May 10, 2019                  [Page 1]
Internet-Draft                     CAA                     November 2018

   (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
   2.  Definitions . . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Requirements Language . . . . . . . . . . . . . . . . . .   4
     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  . . . . . . . . .  14
     6.4.  Denial of Service . . . . . . . . . . . . . . . . . . . .  14
     6.5.  Abuse of the Critical Flag  . . . . . . . . . . . . . . .  14
   7.  Deployment Considerations . . . . . . . . . . . . . . . . . .  14
     7.1.  Blocked Queries or Responses  . . . . . . . . . . . . . .  15
     7.2.  Rejected Queries and Malformed Responses  . . . . . . . .  15
     7.3.  Delegation to Private Nameservers . . . . . . . . . . . .  15
     7.4.  Bogus DNSSEC Responses  . . . . . . . . . . . . . . . . .  15
   8.  Differences versus RFC6844  . . . . . . . . . . . . . . . . .  16
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  16
     9.1.  Certification Authority Restriction Flags . . . . . . . .  16
   10. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  17
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  17
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  17
     11.2.  Informative References . . . . . . . . . . . . . . . . .  19
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