Adaptive DNS: Improving Privacy of Name Resolution
draft-pauly-dprive-adaptive-dns-privacy-01

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Last updated 2019-11-01
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Network Working Group                                         E. Kinnear
Internet-Draft                                                  T. Pauly
Intended status: Standards Track                                 C. Wood
Expires: May 4, 2020                                          Apple Inc.
                                                              P. McManus
                                                                  Fastly
                                                       November 01, 2019

           Adaptive DNS: Improving Privacy of Name Resolution
               draft-pauly-dprive-adaptive-dns-privacy-01

Abstract

   This document defines an architecture that allows clients to
   dynamically discover designated resolvers that offer encrypted DNS
   services, and use them in an adaptive way that improves privacy while
   co-existing with locally provisioned resolvers.  These resolvers can
   be used directly when looking up names for which they are designated.
   These resolvers also provide the ability to proxy encrypted queries,
   thus hiding the identity of the client requesting resolution.

Status of This Memo

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   This Internet-Draft will expire on May 4, 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
   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

Kinnear, et al.            Expires May 4, 2020                  [Page 1]
Internet-Draft                ADNS Privacy                 November 2019

   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.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Specification of Requirements . . . . . . . . . . . . . .   4
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Client Behavior . . . . . . . . . . . . . . . . . . . . . . .   5
     3.1.  Discovering Designated DoH Servers  . . . . . . . . . . .   6
       3.1.1.  Whitelisting Designated DoH Servers . . . . . . . . .   7
       3.1.2.  Accessing Extended Information  . . . . . . . . . . .   8
     3.2.  Discovering Local Resolvers . . . . . . . . . . . . . . .   9
     3.3.  Hostname Resolution Algorithm . . . . . . . . . . . . . .  10
     3.4.  Oblivious Resolution  . . . . . . . . . . . . . . . . . .  11
     3.5.  Handling Network Changes  . . . . . . . . . . . . . . . .  12
   4.  Server Requirements . . . . . . . . . . . . . . . . . . . . .  12
     4.1.  Provide a DoH Server  . . . . . . . . . . . . . . . . . .  12
       4.1.1.  Oblivious DoH Proxy . . . . . . . . . . . . . . . . .  12
       4.1.2.  Oblivious DoH Target  . . . . . . . . . . . . . . . .  13
       4.1.3.  Keying Material . . . . . . . . . . . . . . . . . . .  13
     4.2.  Advertise the DoH Server  . . . . . . . . . . . . . . . .  13
     4.3.  Provide Extended Configuration as a Web PvD . . . . . . .  13
   5.  Server Deployment Considerations  . . . . . . . . . . . . . .  15
     5.1.  Single Content Provider . . . . . . . . . . . . . . . . .  15
     5.2.  Multiple Content Providers  . . . . . . . . . . . . . . .  15
     5.3.  Avoid Narrow Deployments  . . . . . . . . . . . . . . . .  16
   6.  Local Resolver Deployment Considerations  . . . . . . . . . .  16
     6.1.  Designating Local DoH Servers . . . . . . . . . . . . . .  16
     6.2.  Local Use Cases . . . . . . . . . . . . . . . . . . . . .  17
       6.2.1.  Accessing Local-Only Resolvable Content . . . . . . .  17
       6.2.2.  Accessing Locally Optimized Content . . . . . . . . .  18
       6.2.3.  Walled-Garden and Captive Network Deployments . . . .  19
       6.2.4.  Network-Based Filtering . . . . . . . . . . . . . . .  19
   7.  Performance Considerations  . . . . . . . . . . . . . . . . .  20
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  21
   9.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .  21
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