DNS Privacy Requirements for Exchanges between Recursive Resolvers and Authoritative Servers
draft-lmo-dprive-phase2-requirements-00

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DPRIVE                                                      J. Livingood
Internet-Draft                                                   Comcast
Intended status: Informational                              A. Mayrhofer
Expires: April 30, 2020                                      nic.at GmbH
                                                           B. Overeinder
                                                               NLnetLabs
                                                        October 28, 2019

 DNS Privacy Requirements for Exchanges between Recursive Resolvers and
                         Authoritative Servers
                draft-lmo-dprive-phase2-requirements-00

Abstract

   This document provides requirements for adding confidentiality to DNS
   exchanges between recursive resolvers and authoritative servers.

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 April 30, 2020.

Copyright Notice

   Copyright (c) 2019 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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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction & Scope  . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Threat Model and Problem Statement  . . . . . . . . . . . . .   3
   4.  Core Requirements . . . . . . . . . . . . . . . . . . . . . .   4
     4.1.  Prioritization of Requirements  . . . . . . . . . . . . .   5
     4.2.  Opportunistic Upgrade to Encryption . . . . . . . . . . .   5
     4.3.  Detection of Availability . . . . . . . . . . . . . . . .   5
     4.4.  Resistance to Downgrade Attack  . . . . . . . . . . . . .   6
     4.5.  End-User Policy Propagation . . . . . . . . . . . . . . .   6
   5.  Perspectives and Use Cases  . . . . . . . . . . . . . . . . .   7
     5.1.  The User Perspective and Use Cases  . . . . . . . . . . .   8
     5.2.  The Operator Perspective and Use Cases  . . . . . . . . .   8
     5.3.  The Implementor / Software Vendor Perspective and Use
           Cases . . . . . . . . . . . . . . . . . . . . . . . . . .  10
     5.4.  Performance and Efficiency  . . . . . . . . . . . . . . .  10
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  11
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  11
   8.  Changelog . . . . . . . . . . . . . . . . . . . . . . . . . .  11
     8.1.  lmo-dprive-phase2-requirements-00 . . . . . . . . . . . .  11
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  11
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  11
     9.3.  URIs  . . . . . . . . . . . . . . . . . . . . . . . . . .  12
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .  12
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  12

1.  Introduction & Scope

   The 2018 approved charter of the IETF DPRIVE Working Group [1]
   contains milestones related to confidentiality aspects of DNS
   transactions between the iterative resolver and authoritative name
   servers.

   This is also reflected in the DPRIVE milestones [2], which (as of
   October 2019) contains two relevant milestones:

      Develop requirements for adding confidentiality to DNS exchanges
      between recursive resolvers and authoritative servers (unpublished
      document).

      Investigate potential solutions for adding confidentiality to DNS
      exchanges involving authoritative servers (Experimental).

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