DNS Zone Transfer-over-TLS
draft-ietf-dprive-xfr-over-tls-02

Document Type Active Internet-Draft (dprive WG)
Last updated 2020-07-13
Replaces draft-hzpa-dprive-xfr-over-tls
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dprive                                                         W. Toorop
Internet-Draft                                                NLnet Labs
Updates: 1995, 7766 (if approved)                           S. Dickinson
Intended status: Standards Track                              Sinodun IT
Expires: January 14, 2021                                       S. Sahib
                                                                 P. Aras
                                                               A. Mankin
                                                              Salesforce
                                                           July 13, 2020

                       DNS Zone Transfer-over-TLS
                   draft-ietf-dprive-xfr-over-tls-02

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 TLS, rather then clear text, 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 January 14, 2021.

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

Toorop, et al.          Expires January 14, 2021                [Page 1]
Internet-Draft                XFR-over-TLS                     July 2020

   (http://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
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Use Cases for XFR-over-TLS  . . . . . . . . . . . . . . . . .   5
   4.  Connection and Data Flows in Existing XFR Mechanisms  . . . .   5
     4.1.  AXFR Mechanism  . . . . . . . . . . . . . . . . . . . . .   6
     4.2.  IXFR Mechanism  . . . . . . . . . . . . . . . . . . . . .   7
     4.3.  Data Leakage of NOTIFY and SOA Message Exchanges  . . . .   8
       4.3.1.  NOTIFY  . . . . . . . . . . . . . . . . . . . . . . .   8
       4.3.2.  SOA . . . . . . . . . . . . . . . . . . . . . . . . .   8
   5.  Connections and Data Flows in XoT . . . . . . . . . . . . . .   8
     5.1.  TLS versions  . . . . . . . . . . . . . . . . . . . . . .   8
     5.2.  Connection usage  . . . . . . . . . . . . . . . . . . . .   8
       5.2.1.  High level XoT descriptions . . . . . . . . . . . . .   9
       5.2.2.  Previous specifications . . . . . . . . . . . . . . .   9
     5.3.  Update to RFC7766 . . . . . . . . . . . . . . . . . . . .  10
     5.4.  Connection Establishment  . . . . . . . . . . . . . . . .  10
       5.4.1.  Draft Version Identification  . . . . . . . . . . . .  11
     5.5.  Port selection  . . . . . . . . . . . . . . . . . . . . .  11
     5.6.  AXoT mechanism  . . . . . . . . . . . . . . . . . . . . .  11
       5.6.1.  Coverage and relationship to RFC5936  . . . . . . . .  12
       5.6.2.  AXoT connection and message handling  . . . . . . . .  12
       5.6.3.  Padding AXoT responses  . . . . . . . . . . . . . . .  14
     5.7.  IXoT mechanism  . . . . . . . . . . . . . . . . . . . . .  15
       5.7.1.  Coverage and relationship to RFC1995  . . . . . . . .  15
       5.7.2.  IXoT connection and message handling  . . . . . . . .  15
       5.7.3.  Condensation of responses . . . . . . . . . . . . . .  16
       5.7.4.  Fallback to AXFR  . . . . . . . . . . . . . . . . . .  16
       5.7.5.  Padding of IXoT responses . . . . . . . . . . . . . .  16
   6.  Multi-primary Configurations  . . . . . . . . . . . . . . . .  16
   7.  Zone Transfer with DoT - Authentication . . . . . . . . . . .  17
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