DNS Query Name Minimisation to Improve Privacy
draft-ietf-dnsop-rfc7816bis-02

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Network Working Group                                      S. Bortzmeyer
Internet-Draft                                                     AFNIC
Obsoletes: 7816 (if approved)                                 P. Hoffman
Intended status: Standards Track                                   ICANN
Expires: September 25, 2019                               March 24, 2019

             DNS Query Name Minimisation to Improve Privacy
                    draft-ietf-dnsop-rfc7816bis-02

Abstract

   This document describes techniques called "QNAME minimisation" to
   improve DNS privacy, where the DNS resolver no longer always sends
   the full original QNAME to the upstream name server.  This document
   obsoletes RFC 7816.

   This document is part of the IETF DNSOP (DNS Operations) Working
   Group.  The source of the document, as well as a list of open issues,
   is at <https://framagit.org/bortzmeyer/rfc7816-bis>

   NOTE FOR THE DNSOP WORKING GROUP: There is still much work to be done
   in this draft.  Future versions of this draft will contain
   descriptions of different minimisation implementation choices that
   have been made since the RFC 7816 first came out, as well as
   deployment experience.

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
   Task Force (IETF).  Note that other groups may also distribute
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
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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 September 25, 2019.

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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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Table of Contents

   1.  Introduction and Background . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  General Description of QNAME Minimisation . . . . . . . . . .   3
     2.1.  Algorithm to Perform Aggressive Method QNAME Minimisation   5
   3.  Operational Considerations  . . . . . . . . . . . . . . . . .   6
   4.  Performance Considerations  . . . . . . . . . . . . . . . . .   8
   5.  Alternative Methods for QNAME Minimisation  . . . . . . . . .   9
   6.  Results of the Experimentation  . . . . . . . . . . . . . . .   9
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   8.  Implementation Status . . . . . . . . . . . . . . . . . . . .  10
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  11
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  11
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .  13
   Changes from RFC 7816 . . . . . . . . . . . . . . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  13

1.  Introduction and Background

   The problem statement for this document and its predecessor [RFC7816]
   is described in [I-D.bortzmeyer-dprive-rfc7626-bis].  The terminology
   ("QNAME", "resolver", etc.) is defined in
   [I-D.ietf-dnsop-terminology-bis].  This specific solution is not
   intended to fully solve the DNS privacy problem; instead, it should
   be viewed as one tool amongst many.

   QNAME minimisation follows the principle explained in Section 6.1 of
   [RFC6973]: the less data you send out, the fewer privacy problems
   you have.

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   Before QNAME minimisation, when a resolver received the query "What
   is the AAAA record for www.example.com?", it sent to the root
   (assuming a resolver whose cache is empty) the very same question.
   Sending the full QNAME to the authoritative name server was a
   tradition, not a protocol requirement.  In a conversation with the