DNS Privacy Considerations
draft-ietf-dprive-rfc7626-bis-02

Document Type Active Internet-Draft (dprive WG)
Last updated 2019-11-08 (latest revision 2019-10-16)
Replaces draft-bortzmeyer-dprive-rfc7626-bis
Stream IETF
Intended RFC status Informational
Formats plain text pdf htmlized bibtex
Stream WG state Submitted to IESG for Publication
Document shepherd Brian Haberman
Shepherd write-up Show (last changed 2019-11-06)
IESG IESG state AD Evaluation::Revised I-D Needed
Consensus Boilerplate Unknown
Telechat date
Responsible AD √Čric Vyncke
Send notices to Brian Haberman <brian@innovationslab.net>, dns-privacy@ietf.org
dprive                                                     S. Bortzmeyer
Internet-Draft                                                     AFNIC
Obsoletes: 7626 (if approved)                               S. Dickinson
Intended status: Informational                                Sinodun IT
Expires: April 18, 2020                                 October 16, 2019

                       DNS Privacy Considerations
                    draft-ietf-dprive-rfc7626-bis-02

Abstract

   This document describes the privacy issues associated with the use of
   the DNS by Internet users.  It is intended to be an analysis of the
   present situation and does not prescribe solutions.  This document
   obsoletes RFC 7626.

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 18, 2020.

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

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Bortzmeyer & Dickinson   Expires April 18, 2020                 [Page 1]
Internet-Draft         DNS Privacy Considerations           October 2019

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Risks . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
     3.1.  The Alleged Public Nature of DNS Data . . . . . . . . . .   5
     3.2.  Data in the DNS Request . . . . . . . . . . . . . . . . .   6
       3.2.1.  Data in the DNS payload . . . . . . . . . . . . . . .   7
     3.3.  Cache Snooping  . . . . . . . . . . . . . . . . . . . . .   7
     3.4.  On the Wire . . . . . . . . . . . . . . . . . . . . . . .   8
       3.4.1.  Unencrypted Transports  . . . . . . . . . . . . . . .   8
       3.4.2.  Encrypted Transports  . . . . . . . . . . . . . . . .   9
     3.5.  In the Servers  . . . . . . . . . . . . . . . . . . . . .  10
       3.5.1.  In the Recursive Resolvers  . . . . . . . . . . . . .  11
       3.5.2.  In the Authoritative Name Servers . . . . . . . . . .  15
     3.6.  Re-identification and Other Inferences  . . . . . . . . .  16
     3.7.  More Information  . . . . . . . . . . . . . . . . . . . .  17
   4.  Actual "Attacks"  . . . . . . . . . . . . . . . . . . . . . .  17
   5.  Legalities  . . . . . . . . . . . . . . . . . . . . . . . . .  18
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  18
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  18
   8.  Changelog . . . . . . . . . . . . . . . . . . . . . . . . . .  19
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  20
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  20
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  21
     9.3.  URIs  . . . . . . . . . . . . . . . . . . . . . . . . . .  26
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  27

1.  Introduction

   This document is an analysis of the DNS privacy issues, in the spirit
   of Section 8 of [RFC6973].

   The Domain Name System (DNS) is specified in [RFC1034], [RFC1035],
   and many later RFCs, which have never been consolidated.  It is one
   of the most important infrastructure components of the Internet and
   often ignored or misunderstood by Internet users (and even by many
   professionals).  Almost every activity on the Internet starts with a
   DNS query (and often several).  Its use has many privacy implications
   and this document is an attempt at a comprehensive and accurate list.

   Let us begin with a simplified reminder of how the DNS works (See
   also [RFC8499]).  A client, the stub resolver, issues a DNS query to
   a server, called the recursive resolver (also called caching resolver
   or full resolver or recursive name server).  Let's use the query
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