Oblivious DNS - Strong Privacy for DNS Queries
draft-annee-dprive-oblivious-dns-00

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Last updated 2018-07-02
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dprive                                                      A. Edmundson
Internet-Draft                                                P. Schmitt
Intended status: Experimental                                N. Feamster
Expires: January 3, 2019                            Princeton University
                                                               A. Mankin
                                                              Salesforce
                                                            July 2, 2018

             Oblivious DNS - Strong Privacy for DNS Queries
                  draft-annee-dprive-oblivious-dns-00

Abstract

   Recognizing the privacy vulnerabilities associated with DNS queries,
   a number of standards have been developed and services deployed that
   that encrypt a user's DNS queries to the recursive resolver and thus
   obscure them from some network observers and from the user's Internet
   service provider.  However, these systems merely transfer trust to a
   third party.  We argue that no single party should be able to
   associate DNS queries with a client IP address that issues those
   queries.  To this end, this document specifies Oblivious DNS (ODNS),
   which introduces an additional layer of obfuscation between clients
   and their queries.  To accomplish this, ODNS uses its own
   authoritative namespace; the authoritative servers for the ODNS
   namespace act as recursive resolvers for the DNS queries that they
   receive, but they never see the IP addresses for the clients that
   initiated these queries.  The ODNS experimental protocol is
   compatible with existing DNS infrastructure.

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/.

   Internet-Drafts are draft documents valid for a maximum of six months
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   This Internet-Draft will expire on January 3, 2019.

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Copyright Notice

   Copyright (c) 2018 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.  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 as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  ODNS Overview . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Sending and Receiving ODNS Queries  . . . . . . . . . . . . .   5
   5.  Replication and Privacy-Preserving Key Distribution . . . . .   6
     5.1.  Scalability and Performance Using Anycast . . . . . . . .   6
     5.2.  Key Distribution  . . . . . . . . . . . . . . . . . . . .   6
     5.3.  QNAME Length  . . . . . . . . . . . . . . . . . . . . . .   7
   6.  Backward Compatibility  . . . . . . . . . . . . . . . . . . .   7
   7.  IANA considerations . . . . . . . . . . . . . . . . . . . . .   8
   8.  Security considerations . . . . . . . . . . . . . . . . . . .   8
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   8
   10. Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   8
   11. Changelog . . . . . . . . . . . . . . . . . . . . . . . . . .   8
   12. References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     12.1.  Normative References . . . . . . . . . . . . . . . . . .   8
     12.2.  Informative References . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in BCP
   14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

   Privacy terminology is as described in Section 3 of [RFC6973].

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