Associating a DoH Server with a Resolver
draft-hoffman-resolver-associated-doh-05

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Network Working Group                                         P. Hoffman
Internet-Draft                                                     ICANN
Intended status: Standards Track                       November 05, 2018
Expires: May 9, 2019

                Associating a DoH Server with a Resolver
                draft-hoffman-resolver-associated-doh-05

Abstract

   Browsers and web applications may want to know if there are one or
   more DoH servers associated with the DNS recursive resolver that the
   operating system is already using.  This would allow them to get DNS
   responses from a resolver that the user (or, more likely, the user's
   network administrator) has already chosen.  This document describes
   two protocols for a resolver to tell a client what its associated DoH
   servers are.

Status of This Memo

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   This Internet-Draft will expire on May 9, 2019.

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
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   (https://trustee.ietf.org/license-info) in effect on the date of
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   include Simplified BSD License text as described in Section 4.e of

Hoffman                    Expires May 9, 2019                  [Page 1]
Internet-Draft           Resolver Associated DoH           November 2018

   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Finding the URI Templates of the DoH Servers Associated with
       a Resolver  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  DoH Servers by TXT  . . . . . . . . . . . . . . . . . . .   4
     2.2.  DoH Servers by Addresses  . . . . . . . . . . . . . . . .   4
       2.2.1.  Finding the IP Addresses of a Resolver  . . . . . . .   5
       2.2.2.  Finding the DoH Servers Associated with a Resolver  .   5
     2.3.  Issues Common to "DoH Servers by TXT" and "DoH Servers by
           Addresses"  . . . . . . . . . . . . . . . . . . . . . . .   6
     2.4.  Choosing Between "DoH Servers by TXT" and "DoH Servers by
           Addresses"  . . . . . . . . . . . . . . . . . . . . . . .   6
     2.5.  User Interface  . . . . . . . . . . . . . . . . . . . . .   6
   3.  Design Choices  . . . . . . . . . . . . . . . . . . . . . . .   6
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   5.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .   7
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .   9
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   DoH [RFC8484] requires that one or more DoH servers be configured for
   the DoH client.  That document does not say how the DoH servers are
   found, nor how to select from a list of possible DoH servers, nor
   what the user interface (UI) for the configuration should be.

   There is a use case for browsers and web applications who have one or
   more currently-configured DNS recursive resolvers wanting to use DoH
   for DNS resolution instead.  For example, the recursive resolver
   knows how to give correct answers to DNS queries that contain names
   that are only resolvable in the local context.  Users typically
   configure their DNS recursive resolvers with through manual
   configuration (such as manually editing a /etc/named.conf file) or
   through automatic configuration from a protocol such as DHCP.

   The client that wants to change from its currently-configured Do53
   recursive resolver(s) to one or more DoH servers might be the stub
   resolver in an operating system, although at this time it is rare