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Dprive Working Group                                              Z. Yan
Internet-Draft                                                   G. Geng
Intended status: Standards Track                                   CNNIC
Expires: July 23, 2020                                            Y. Liu
                                                        January 20, 2020

       Indication of Local DNS Privacy Service During User Access


   This document aims to support the indication of privacy service of
   recursive resolver during the user access.

Requirements Language

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

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 July 23, 2020.

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

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   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
   2.  ICMPv6 based case . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Other configuration cases . . . . . . . . . . . . . . . . . .   2
   4.  Security considerations . . . . . . . . . . . . . . . . . . .   3
   5.  Normative References  . . . . . . . . . . . . . . . . . . . .   3
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   3

1.  Introduction

   In order to enhance the privacy protection in DNS, several solutions
   have been developed to support the encrypted communications between
   stub and recursive resolvers, such as DNS-over-DTLS [RFC8094], DNS-
   over-TLS [RFC7858], DNS-over-QUIC and so on.  However, a scheme is
   needed in order to explicitly make the user aware of the privacy
   service supported by the recursive resolver in order to avoid the
   blind attempt by the user and support the user to bootstrap the
   preferred privacy protocol more easily.  This can be achieved during
   the user initial access, using extended DHCPv6 or ICMPv6 to configure
   its recursive resolver with related information (only IPv6 scenario
   is considered here).

2.  ICMPv6 based case

   The "Recursive DNS Server Option" is defined in [RFC8106] to support
   the user to configure DNS recursive resolver in the IPv6 SLAAC mode.
   Then an x-bit flag in the Reserved field of "Recursive DNS Server
   Option" can be used to indicate the privacy service of the
   corresponding recursive resolver specified in the field of "Addresses
   of IPv6 Recursive DNS Servers".  However, if this function is used,
   the "Addresses of IPv6 Recursive DNS Servers" should contain only one
   address of recursive resolver.  What the size of "x" and how to
   specify the flag corresponding to the supported privacy service of
   the recursive resolver will be detailed further.

3.  Other configuration cases

   The procedures based on the DHCPv6 or other configuration protocols
   [RFC3646][RFC4339]will also be considered further.

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4.  Security considerations


5.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,

   [RFC3646]  Droms, R., Ed., "DNS Configuration options for Dynamic
              Host Configuration Protocol for IPv6 (DHCPv6)", RFC 3646,
              DOI 10.17487/RFC3646, December 2003,

   [RFC4339]  Jeong, J., Ed., "IPv6 Host Configuration of DNS Server
              Information Approaches", RFC 4339, DOI 10.17487/RFC4339,
              February 2006, <https://www.rfc-editor.org/info/rfc4339>.

   [RFC7858]  Hu, Z., Zhu, L., Heidemann, J., Mankin, A., Wessels, D.,
              and P. Hoffman, "Specification for DNS over Transport
              Layer Security (TLS)", RFC 7858, DOI 10.17487/RFC7858, May
              2016, <https://www.rfc-editor.org/info/rfc7858>.

   [RFC8094]  Reddy, T., Wing, D., and P. Patil, "DNS over Datagram
              Transport Layer Security (DTLS)", RFC 8094,
              DOI 10.17487/RFC8094, February 2017,

   [RFC8106]  Jeong, J., Park, S., Beloeil, L., and S. Madanapalli,
              "IPv6 Router Advertisement Options for DNS Configuration",
              RFC 8106, DOI 10.17487/RFC8106, March 2017,

Authors' Addresses

   Zhiwei Yan
   No.4 South 4th Street, Zhongguancun
   Beijing  100190

   EMail: yan@cnnic.cn

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   Guanggang Geng
   No.4 South 4th Street, Zhongguancun
   Beijing  100190

   EMail: ggg@cnnic.cn

   Yang Liu
   No.52, Huayuanbeilu
   Beijing  100191

   EMail: liuyang7@caict.ac.cn

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