DNS Resolver Information Self-publication
draft-ietf-dnsop-resolver-information-01

Document Type Active Internet-Draft (dnsop WG)
Last updated 2020-02-11
Replaces draft-sah-resolver-information, draft-sah-resinfo-doh
Stream IETF
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Network Working Group                                            P. Sood
Internet-Draft                                                    Google
Intended status: Standards Track                               R. Arends
Expires: August 14, 2020                                      P. Hoffman
                                                                   ICANN
                                                       February 11, 2020

               DNS Resolver Information Self-publication
                draft-ietf-dnsop-resolver-information-01

Abstract

   This document describes methods for DNS resolvers to self-publish
   information about themselves, such as whether they perform DNSSEC
   validation or are available over transports other than what is
   defined in RFC 1035.  The information is returned as a JSON object.
   The names in this object are defined in an IANA registry that allows
   for light-weight registration.  Applications and operating systems
   can use the methods defined here to get the information from
   resolvers in order to make choices about how to send future queries
   to those resolvers.

   There is a GitHub repo for this draft where pull requests can be
   issued: https://github.com/DNSOP/draft-ietf-dnsop-resolver-
   information However, starting issues on the WG mailing list is
   preferred.

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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on August 14, 2020.

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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
   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.  Definitions . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Retrieving Resolver Information by DNS  . . . . . . . . . . .   3
   3.  Retrieving Resolver Information by Well-Known URI . . . . . .   4
   4.  Contents of the Returned I-JSON Object  . . . . . . . . . . .   5
     4.1.  The "inventory" name  . . . . . . . . . . . . . . . . . .   6
     4.2.  Example . . . . . . . . . . . . . . . . . . . . . . . . .   6
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
     5.1.  RESINFO RRtype  . . . . . . . . . . . . . . . . . . . . .   6
     5.2.  Registry for DNS Resolver Information . . . . . . . . . .   7
     5.3.  resolver-info Well-known URI  . . . . . . . . . . . . . .   7
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   Historically, DNS stub resolvers typically communicated with the
   recursive resolvers in their configuration without needing to know
   anything about the features of the recursive resolvers.  More
   recently, recursive resolvers have different features that may cause
   stub resolvers to make choices about which configured resolver from
   its configuration to use, and also how to communicate with the
   recursive resolver (such as over different transports).  Thus stub
   resolvers need a way to get information from recursive resolvers
   about features that might affect the communication.

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   This document specifies methods for stub resolvers to ask recursive
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