DNS Privacy Requirements for Exchanges between Recursive Resolvers and Authoritative Servers
draft-lmo-dprive-phase2-requirements-01

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DPRIVE                                                      J. Livingood
Internet-Draft                                                   Comcast
Intended status: Informational                              A. Mayrhofer
Expires: May 7, 2020                                         nic.at GmbH
                                                           B. Overeinder
                                                              NLnet Labs
                                                       November 04, 2019

 DNS Privacy Requirements for Exchanges between Recursive Resolvers and
                         Authoritative Servers
                draft-lmo-dprive-phase2-requirements-01

Abstract

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

Status of This Memo

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   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   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 May 7, 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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   include Simplified BSD License text as described in Section 4.e of

Livingood, et al.          Expires May 7, 2020                  [Page 1]
Internet-Draft         DPRIVE Phase 2 Requirements         November 2019

   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction & Scope  . . . . . . . . . . . . . . . . . . . .   2
   2.  Document Development  . . . . . . . . . . . . . . . . . . . .   3
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Threat Model and Problem Statement  . . . . . . . . . . . . .   3
   5.  Perspectives and Use Cases  . . . . . . . . . . . . . . . . .   4
     5.1.  The User Perspective and Use Cases  . . . . . . . . . . .   4
     5.2.  The Operator Perspective and Use Cases  . . . . . . . . .   5
     5.3.  The Implementor / Software Vendor Perspective and Use
           Cases . . . . . . . . . . . . . . . . . . . . . . . . . .   7
   6.  Preliminary Requirements  . . . . . . . . . . . . . . . . . .   7
     6.1.  Mandatory Requirements (Proposed) . . . . . . . . . . . .   7
     6.2.  Optional Requirements (Proposed)  . . . . . . . . . . . .   8
     6.3.  Working Group Discussion Needed . . . . . . . . . . . . .   8
     6.4.  Prioritization of Requirements  . . . . . . . . . . . . .   9
     6.5.  Opportunistic Upgrade to Encryption . . . . . . . . . . .   9
     6.6.  Detection of Availability . . . . . . . . . . . . . . . .  10
     6.7.  Resistance to Downgrade Attack  . . . . . . . . . . . . .  10
     6.8.  End-User Policy Propagation . . . . . . . . . . . . . . .  11
     6.9.  Performance and Efficiency  . . . . . . . . . . . . . . .  12
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  12
   9.  Changelog . . . . . . . . . . . . . . . . . . . . . . . . . .  12
     9.1.  lmo-dprive-phase2-requirements-00 . . . . . . . . . . . .  12
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  12
     10.2.  Informative References . . . . . . . . . . . . . . . . .  13
     10.3.  URIs . . . . . . . . . . . . . . . . . . . . . . . . . .  14
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .  14
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  14

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