DNS Zone Transfer-over-TLS
draft-ietf-dprive-xfr-over-tls-00

Document Type Active Internet-Draft (dprive WG)
Last updated 2019-11-20 (latest revision 2019-11-18)
Replaces draft-hzpa-dprive-xfr-over-tls
Stream IETF
Intended RFC status Proposed Standard
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dprive                                                          H. Zhang
Internet-Draft                                                   P. Aras
Updates: 1995 (if approved)                                   Salesforce
Intended status: Standards Track                               W. Toorop
Expires: May 21, 2020                                         NLnet Labs
                                                            S. Dickinson
                                                              Sinodun IT
                                                               A. Mankin
                                                              Salesforce
                                                       November 18, 2019

                       DNS Zone Transfer-over-TLS
                   draft-ietf-dprive-xfr-over-tls-00

Abstract

   DNS zone transfers are transmitted in clear text, which gives
   attackers the opportunity to collect the content of a zone by
   eavesdropping on network connections.  The DNS Transaction Signature
   (TSIG) mechanism is specified to restrict direct zone transfer to
   authorized clients only, but it does not add confidentiality.  This
   document specifies use of DNS-over-TLS to prevent zone contents
   collection via passive monitoring of zone transfers.

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 21, 2020.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Zhang, et al.             Expires May 21, 2020                  [Page 1]
Internet-Draft                XFR-over-TLS                 November 2019

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Use Cases for XFR-over-TLS  . . . . . . . . . . . . . . . . .   4
   4.  Connection and Data Flows in Existing XFR Mechanisms  . . . .   5
     4.1.  AXFR Mechanism  . . . . . . . . . . . . . . . . . . . . .   5
     4.2.  IXFR Mechanism  . . . . . . . . . . . . . . . . . . . . .   6
     4.3.  Data Leakage of NOTIFY and SOA Message Exchanges  . . . .   7
       4.3.1.  NOTIFY  . . . . . . . . . . . . . . . . . . . . . . .   7
       4.3.2.  SOA . . . . . . . . . . . . . . . . . . . . . . . . .   8
   5.  Connection and Data Flows in XoT  . . . . . . . . . . . . . .   8
     5.1.  Performance Considerations  . . . . . . . . . . . . . . .   8
     5.2.  AXoT mechanism  . . . . . . . . . . . . . . . . . . . . .   8
     5.3.  IXoT mechanism  . . . . . . . . . . . . . . . . . . . . .   9
       5.3.1.  Fallback to AXFR  . . . . . . . . . . . . . . . . . .  10
   6.  Zone Transfer with DoT - Authentication . . . . . . . . . . .  10
     6.1.  TSIG  . . . . . . . . . . . . . . . . . . . . . . . . . .  10
     6.2.  SIG(0)  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     6.3.  TLS . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
       6.3.1.  Opportunistic . . . . . . . . . . . . . . . . . . . .  10
       6.3.2.  Strict  . . . . . . . . . . . . . . . . . . . . . . .  10
       6.3.3.  Mutual  . . . . . . . . . . . . . . . . . . . . . . .  10
     6.4.  IP Based ACL on the Primary . . . . . . . . . . . . . . .  11
     6.5.  ZONEMD  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     6.6.  Comparison of Authentication Methods  . . . . . . . . . .  11
   7.  Policies for Both AXFR and IXFR . . . . . . . . . . . . . . .  12
   8.  Multi-primary Configurations  . . . . . . . . . . . . . . . .  13
   9.  Implementation Considerations . . . . . . . . . . . . . . . .  14
   10. Implementation Status . . . . . . . . . . . . . . . . . . . .  14
   11. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
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