Message Digest for DNS Zones
draft-ietf-dnsop-dns-zone-digest-07
Internet Engineering Task Force D. Wessels
Internet-Draft P. Barber
Intended status: Standards Track M. Weinberg
Expires: October 30, 2020 Verisign
W. Kumari
Google
W. Hardaker
USC/ISI
April 28, 2020
Message Digest for DNS Zones
draft-ietf-dnsop-dns-zone-digest-07
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 October 30, 2020 [Page 1]
Internet-Draft DNS Zone Digest April 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 October 30, 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
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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
3.2. Optionally Sign the Zone . . . . . . . . . . . . . . . . 10
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