A Proposal for a DoH Discovery Trial

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Last updated 2020-07-13
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Network Working Group                                            N. Cook
Internet-Draft                                                V. Bertola
Intended status: Informational                              Open-Xchange
Expires: January 14, 2021                                      A. Fidler
                                                                  BT plc
                                                              N. Leymann
                                                        Deutsche Telekom
                                                                R. Weber
                                                           July 13, 2020

                  A Proposal for a DoH Discovery Trial


   The following document describes a proposal for a trial of an
   experimental mechanism for the discovery of DNS-over-HTTPS resolvers
   provided by Internet Service Providers to their customers.

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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   This Internet-Draft will expire on January 14, 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.  Please review these documents
   carefully, as they describe your rights and restrictions with respect

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   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.

1.  Introduction

   The introduction of encrypted DNS transport protocols like DoH (DNS-
   over-HTTPS [RFC8484]) can provide additional confidentiality to
   Internet users that need a DNS resolution service to access online
   resources.  Most end-users currently get their DNS resolution service
   from the Internet Service Provider that also supplies them with
   Internet access; thus, to promote a straightforward migration path
   from unencrypted to encrypted DNS transport and to avoid the issues
   deriving from a change of DNS provider, it would be useful to
   establish a mechanism through which stub DNS resolvers on the user's
   device can discover under appropriate security conditions whether the
   local network provides a DoH resolver, and if so, start using it
   automatically.  This DoH deployment model will be referred to as
   "same provider auto-upgrade".

   This document describes an experimental mechanism which was developed
   by a group of Internet Service Providers and DNS implementers for
   that use case, based on the use of a DNS query for a special use
   domain name.  It is intended as an informational document to support
   and encourage other parties to join the experiment.

2.  Requirements Notation and Conventions

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   document are to be interpreted as described in [RFC2119].

   Throughout this document, values are quoted to indicate that they are
   to be taken literally.  When using these values in protocol messages,
   the quotes MUST NOT be used as part of the value.

3.  Rationale

   The IETF ADD Working Group was approved by the IESG in February 2020;
   an extract from the charter [ADD] follows:

   "This working group will focus on discovery and selection of DNS
   resolvers by DNS clients in a variety of networking environments,
   including public networks, private networks, and VPNs, supporting
   both encrypted and unencrypted resolvers.  It is chartered solely to
   develop technical mechanisms.  Making any recommendations about
   specific policies for clients or servers is out of scope."

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   To support the achievement of this technical objective, non-technical
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