DNS Queries over HTTPS (DoH)
draft-ietf-doh-dns-over-https-14

Document Type Active Internet-Draft (doh WG)
Last updated 2018-08-24 (latest revision 2018-08-16)
Replaces draft-hoffman-dispatch-dns-over-https, draft-hoffman-dns-over-https
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Network Working Group                                         P. Hoffman
Internet-Draft                                                     ICANN
Intended status: Standards Track                              P. McManus
Expires: February 17, 2019                                       Mozilla
                                                         August 16, 2018

                      DNS Queries over HTTPS (DoH)
                    draft-ietf-doh-dns-over-https-14

Abstract

   This document defines a protocol for sending DNS queries and getting
   DNS responses over HTTPS.  Each DNS query-response pair is mapped
   into an HTTP exchange.

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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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on February 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
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   described in the Simplified BSD License.

Hoffman & McManus       Expires February 17, 2019               [Page 1]
Internet-Draft        DNS Queries over HTTPS (DoH)           August 2018

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Selection of DoH Server . . . . . . . . . . . . . . . . . . .   3
   4.  The HTTP Exchange . . . . . . . . . . . . . . . . . . . . . .   4
     4.1.  The HTTP Request  . . . . . . . . . . . . . . . . . . . .   4
       4.1.1.  HTTP Request Examples . . . . . . . . . . . . . . . .   5
     4.2.  The HTTP Response . . . . . . . . . . . . . . . . . . . .   6
       4.2.1.  Handling DNS and HTTP Errors  . . . . . . . . . . . .   6
       4.2.2.  HTTP Response Example . . . . . . . . . . . . . . . .   7
   5.  HTTP Integration  . . . . . . . . . . . . . . . . . . . . . .   7
     5.1.  Cache Interaction . . . . . . . . . . . . . . . . . . . .   7
     5.2.  HTTP/2  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     5.3.  Server Push . . . . . . . . . . . . . . . . . . . . . . .   9
     5.4.  Content Negotiation . . . . . . . . . . . . . . . . . . .  10
   6.  Definition of the application/dns-message media type  . . . .  10
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
     7.1.  Registration of application/dns-message Media Type  . . .  10
   8.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .  12
     8.1.  On The Wire . . . . . . . . . . . . . . . . . . . . . . .  12
     8.2.  In The Server . . . . . . . . . . . . . . . . . . . . . .  12
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
   10. Operational Considerations  . . . . . . . . . . . . . . . . .  14
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  16
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  16
     11.2.  Informative References . . . . . . . . . . . . . . . . .  17
   Appendix A.  Protocol Development . . . . . . . . . . . . . . . .  19
   Appendix B.  Previous Work on DNS over HTTP or in Other Formats .  19
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .  20
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  20

1.  Introduction

   This document defines a specific protocol, DNS over HTTPS (DoH), for
   sending DNS [RFC1035] queries and getting DNS responses over HTTP
   [RFC7540] using https [RFC2818] URIs (and therefore TLS [RFC8446]
   security for integrity and confidentiality).  Each DNS query-response
   pair is mapped into an HTTP exchange.

   The described approach is more than a tunnel over HTTP.  It
   establishes default media formatting types for requests and responses
   but uses normal HTTP content negotiation mechanisms for selecting
   alternatives that endpoints may prefer in anticipation of serving new
   use cases.  In addition to this media type negotiation, it aligns
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