DNS Zone Transfer over TLS
draft-hzpa-dprive-xfr-over-tls-01

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Last updated 2019-03-11
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dprive                                                          H. Zhang
Internet-Draft                                                   P. Aras
Intended status: Standards Track                              Salesforce
Expires: September 12, 2019                                    W. Toorop
                                                              NLnet Labs
                                                            S. Dickinson
                                                              Sinodun IT
                                                               A. Mankin
                                                              Salesforce
                                                          March 11, 2019

                       DNS Zone Transfer over TLS
                   draft-hzpa-dprive-xfr-over-tls-01

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.

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   This Internet-Draft will expire on September 12, 2019.

Copyright Notice

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

Zhang, et al.          Expires September 12, 2019               [Page 1]
Internet-Draft                XFR over TLS                    March 2019

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Zone Transfer Confidentiality Overview  . . . . . . . . . . .   4
   4.  Zone Transfer with DoT - Authentication . . . . . . . . . . .   4
     4.1.  TSIG  . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     4.2.  Mutual TLS  . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  Session Establishment and Closing . . . . . . . . . . . . . .   4
     5.1.  AXFR Sessions . . . . . . . . . . . . . . . . . . . . . .   4
     5.2.  IXFR Sessions . . . . . . . . . . . . . . . . . . . . . .   4
     5.3.  Policies for Both AXFR and IXFR . . . . . . . . . . . . .   5
     5.4.  Next Steps  . . . . . . . . . . . . . . . . . . . . . . .   5
   6.  Performance Considerations  . . . . . . . . . . . . . . . . .   5
   7.  Implementation Considerations . . . . . . . . . . . . . . . .   5
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   10. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   6
   11. Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   6
   12. Changelog . . . . . . . . . . . . . . . . . . . . . . . . . .   6
   13. Normative References  . . . . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   DNS has a number of privacy vulnerabilities, as discussed in detail
   in [I-D.bortzmeyer-dprive-rfc7626-bis].  Stub client to recursive
   resolver query privacy has received the most attention to date.
   There are now standards track documents for three encryption
   capabilities for stub to recursive queries and more work going on to
   guide deployment of specifically DNS-over-TLS (DoT) [RFC7858] and
   DNS-over-HTTPS (DoH) [RFC8484].

   [I-D.bortzmeyer-dprive-rfc7626-bis] established that stub client DNS
   query transactions are not public and needed protection, but on zone
   transfer [RFC1995] [RFC5936] it says only:
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