Message Digest for DNS Zones
draft-ietf-dnsop-dns-zone-digest-08

Document Type Active Internet-Draft (dnsop WG)
Last updated 2020-07-24 (latest revision 2020-06-12)
Replaces draft-wessels-dns-zone-digest
Stream IETF
Intended RFC status Proposed Standard
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Document shepherd Tim Wicinski
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Internet Engineering Task Force                               D. Wessels
Internet-Draft                                                 P. Barber
Intended status: Standards Track                                Verisign
Expires: December 14, 2020                                   M. Weinberg
                                                                  Amazon
                                                               W. Kumari
                                                                  Google
                                                             W. Hardaker
                                                                 USC/ISI
                                                           June 12, 2020

                      Message Digest for DNS Zones
                  draft-ietf-dnsop-dns-zone-digest-08

Abstract

   This document describes a protocol and new DNS Resource Record that
   can be used to provide a cryptographic message digest over DNS zone
   data.  The ZONEMD Resource Record conveys the 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 protects
   individual RRSets (DNS data with fine granularity), ZONEMD protects a
   zone's data as a whole, whether consumed by authoritative name
   servers, recursive name servers, or any other applications.

   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 is
   designed so that new digest schemes may be developed in the future 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 December 14, 2020               [Page 1]
Internet-Draft               DNS Zone Digest                   June 2020

   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 December 14, 2020.

Copyright Notice

   Copyright (c) 2020 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 . . . . . . . . . . . . . . . . . . . . .   6
     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 . . . . . . . . . . . . . . . .   7
       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.  Non-apex ZONEMD Records . . . . . . . . . . . . . . . . .   8
     2.2.  ZONEMD RDATA Wire Format  . . . . . . . . . . . . . . . .   8
       2.2.1.  The Serial Field  . . . . . . . . . . . . . . . . . .   8
       2.2.2.  The Scheme Field  . . . . . . . . . . . . . . . . . .   9
       2.2.3.  The Hash Algorithm Field  . . . . . . . . . . . . . .   9
       2.2.4.  The Digest Field  . . . . . . . . . . . . . . . . . .   9
     2.3.  ZONEMD Presentation Format  . . . . . . . . . . . . . . .   9
     2.4.  ZONEMD Example  . . . . . . . . . . . . . . . . . . . . .  10
   3.  Calculating the Digest  . . . . . . . . . . . . . . . . . . .  10
     3.1.  Add ZONEMD Placeholder  . . . . . . . . . . . . . . . . .  10
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