Message Digest for DNS Zones
draft-wessels-dns-zone-digest-03

Document Type Active Internet-Draft (dnsop WG)
Last updated 2018-10-09
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Internet Engineering Task Force                               D. Wessels
Internet-Draft                                                 P. Barber
Intended status: Experimental                                M. Weinberg
Expires: April 12, 2019                                         Verisign
                                                               W. Kumari
                                                                  Google
                                                             W. Hardaker
                                                                 USC/ISI
                                                         October 9, 2018

                      Message Digest for DNS Zones
                    draft-wessels-dns-zone-digest-03

Abstract

   This document describes an experimental protocol and new DNS Resource
   Record that can be used to provide an message digest over DNS zone
   data.  The ZONEMD Resource Record conveys the message digest data in
   the zone itself.  When a zone publisher includes an ZONEMD record,
   recipients can verify the zone contents for accuracy and
   completeness.  This provides assurance that received zone data
   matches published data, regardless of how the zone data has been
   transmitted and received.

   ZONEMD is not designed to replace DNSSEC.  Whereas DNSSEC is designed
   to protect recursive name servers and their caches, ZONEMD protects
   applications that consume zone files, whether they be authoritative
   name servers, recursive name servers, or uses of zone file data.

   As specified at this time, ZONEMD is not designed for use in large,
   dynamic zones due to the time and resources required for digest
   calculation.  The ZONEMD record described in this document includes
   fields reserved for future work to support large, dynamic zones.

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

Wessels, et al.          Expires April 12, 2019                 [Page 1]
Internet-Draft               DNS Zone Digest                October 2018

   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 April 12, 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
   (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  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Motivation  . . . . . . . . . . . . . . . . . . . . . . .   4
     1.2.  Design Overview . . . . . . . . . . . . . . . . . . . . .   5
     1.3.  Use Cases . . . . . . . . . . . . . . . . . . . . . . . .   6
       1.3.1.  Root Zone . . . . . . . . . . . . . . . . . . . . . .   6
       1.3.2.  Providers, Secondaries, and Anycast . . . . . . . . .   6
       1.3.3.  Response Policy Zones . . . . . . . . . . . . . . . .   6
       1.3.4.  Centralized Zone Data Service . . . . . . . . . . . .   7
       1.3.5.  General Purpose Comparison Check  . . . . . . . . . .   7
     1.4.  Requirements Language . . . . . . . . . . . . . . . . . .   7
   2.  The ZONEMD Resource Record  . . . . . . . . . . . . . . . . .   7
     2.1.  ZONEMD RDATA Wire Format  . . . . . . . . . . . . . . . .   7
       2.1.1.  The Serial Field  . . . . . . . . . . . . . . . . . .   8
       2.1.2.  The Digest Type Field . . . . . . . . . . . . . . . .   8
       2.1.3.  The Reserved Field  . . . . . . . . . . . . . . . . .   8
       2.1.4.  The Digest Field  . . . . . . . . . . . . . . . . . .   9
     2.2.  ZONEMD Presentation Format  . . . . . . . . . . . . . . .   9
     2.3.  ZONEMD Example  . . . . . . . . . . . . . . . . . . . . .   9
   3.  Calculating the Digest  . . . . . . . . . . . . . . . . . . .   9
     3.1.  Canonical Format and Ordering . . . . . . . . . . . . . .   9
       3.1.1.  Order of RRsets Having the Same Owner Name  . . . . .  10
       3.1.2.  Special Considerations for SOA RRs  . . . . . . . . .  10
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