Associating a DoH Server with a Resolver
draft-hoffman-resolver-associated-doh-07

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Network Working Group                                         P. Hoffman
Internet-Draft                                                     ICANN
Intended status: Standards Track                       December 14, 2018
Expires: June 17, 2019

                Associating a DoH Server with a Resolver
                draft-hoffman-resolver-associated-doh-07

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.  It also describes a protocol for a client to find out
   the address of the resolver it is using, if it cannot find that
   address by an operating system API or some other means.

Status of This Memo

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   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on June 17, 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
   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

Hoffman                   Expires June 17, 2019                 [Page 1]
Internet-Draft           Resolver Associated DoH           December 2018

   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  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   4
   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  . . . . . . . . . . . . . . . .   5
     2.3.  Issues Common to "DoH Servers by TXT" and "Resolver
           Addresses by SUDN"  . . . . . . . . . . . . . . . . . . .   6
   3.  Finding the Resolver Addresses Without Operating System APIs    6
   4.  User Interface  . . . . . . . . . . . . . . . . . . . . . . .   6
   5.  Design Choices  . . . . . . . . . . . . . . . . . . . . . . .   7
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   7.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .   8
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .   9
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  10

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 to want the DNS
   recursive resolver(s) configured in the operating system to use DoH
   for DNS resolution instead of normal DNS, but to do so to at a DoH
   server specified by the configured resolver.  For example, a
   recursive resolver configured by the operating system may know how to
   give correct answers to DNS queries that contain names that are only
   resolvable in the local context, or resolve differently in the local
   context.  Similarly, the recursive resolver configured in the
   operating system may implement security policies such as malware
   prevention that are not implemented in the same way in DoH servers
   not affiliated with the user's organization.  Users typically
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