DNS Query Name Minimisation to Improve Privacy
draft-ietf-dnsop-rfc7816bis-06

Document Type Active Internet-Draft (dnsop WG)
Authors St├ęphane Bortzmeyer  , Ralph Dolmans  , Paul Hoffman 
Last updated 2020-09-28
Replaces draft-bortzmeyer-rfc7816bis
Stream IETF
Intended RFC status Internet Standard
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Network Working Group                                      S. Bortzmeyer
Internet-Draft                                                     AFNIC
Obsoletes: 7816 (if approved)                                 R. Dolmans
Intended status: Standards Track                              NLnet Labs
Expires: 1 April 2021                                         P. Hoffman
                                                                   ICANN
                                                       28 September 2020

             DNS Query Name Minimisation to Improve Privacy
                draft-ietf-dnsop-rfc7816bis-06

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>

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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   Drafts is at https://datatracker.ietf.org/drafts/current/.

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   This Internet-Draft will expire on 1 April 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 (https://trustee.ietf.org/
   license-info) in effect on the date of publication of this document.

Bortzmeyer, et al.        Expires 1 April 2021                  [Page 1]
Internet-Draft             QNAME Minimisation             September 2020

   Please review these documents carefully, as they describe your rights
   and restrictions with respect to this document.  Code Components
   extracted from this document must include Simplified BSD License text
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   provided without warranty as described in the Simplified BSD License.

Table of Contents

   1.  Introduction and Background . . . . . . . . . . . . . . . . .   2
     1.1.  Experience From RFC 7816  . . . . . . . . . . . . . . . .   3
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Description of QNAME Minimisation . . . . . . . . . . . . . .   3
   3.  Algorithm to Perform Aggressive Method QNAME Minimisation . .   5
   4.  QNAME Minimisation Examples . . . . . . . . . . . . . . . . .   6
   5.  Limit Number of Queries . . . . . . . . . . . . . . . . . . .   7
   6.  Performance Considerations  . . . . . . . . . . . . . . . . .   9
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  10
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .  11
   Changes from RFC 7816 . . . . . . . . . . . . . . . . . . . . . .  11
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  12

1.  Introduction and Background

   The problem statement for this document is described in [RFC7626].
   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.

   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
   author in January 2015, Paul Mockapetris explained that this
   tradition comes from a desire to optimise the number of requests,
   when the same name server is authoritative for many zones in a given
   name (something that was more common in the old days, where the same
   name servers served .com and the root) or when the same name server
   is both recursive and authoritative (something that is strongly
   discouraged now).  Whatever the merits of this choice at this time,
   the DNS is quite different now.
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