Recommendations for DNS Privacy Service Operators
draft-ietf-dprive-bcp-op-00

Document Type Active Internet-Draft (dprive WG)
Last updated 2018-08-08
Replaces draft-dickinson-dprive-bcp-op
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dprive                                                      S. Dickinson
Internet-Draft                                                Sinodun IT
Intended status: Best Current Practice                     B. Overeinder
Expires: February 9, 2019                                     NLnet Labs
                                                    R. van Rijswijk-Deij
                                                              SURFnet bv
                                                               A. Mankin
                                                              Salesforce
                                                          August 8, 2018

           Recommendations for DNS Privacy Service Operators
                      draft-ietf-dprive-bcp-op-00

Abstract

   This document presents operational, policy and security
   considerations for DNS operators who choose to offer DNS Privacy
   services.  With the recommendations, the operator can make deliberate
   decisions which services to provide, and how the decisions and
   alternatives impact the privacy of users.

   This document also presents a framework to assist writers of DNS
   Privacy Policy and Practices Statements (analogous to DNS Security
   Extensions (DNSSEC) Policies and DNSSEC Practice Statements described
   in [RFC6841]).

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 http://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 February 9, 2019.

Dickinson, et al.       Expires February 9, 2019                [Page 1]
Internet-Draft     DNS Privacy Service Recommendations       August 2018

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
   (http://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
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   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  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Privacy related documents . . . . . . . . . . . . . . . . . .   5
   4.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   6
   5.  Recommendations for DNS privacy services  . . . . . . . . . .   6
     5.1.  On the wire between client and server . . . . . . . . . .   7
       5.1.1.  Transport recommendations . . . . . . . . . . . . . .   7
       5.1.2.  Authentication of DNS privacy services  . . . . . . .   8
       5.1.3.  Protocol recommendations  . . . . . . . . . . . . . .   9
       5.1.4.  Availability  . . . . . . . . . . . . . . . . . . . .  10
       5.1.5.  Service options . . . . . . . . . . . . . . . . . . .  11
       5.1.6.  Limitations of using a pure TLS proxy . . . . . . . .  11
     5.2.  Data at rest on the server  . . . . . . . . . . . . . . .  12
       5.2.1.  Data handling . . . . . . . . . . . . . . . . . . . .  12
       5.2.2.  Data minimization of network traffic  . . . . . . . .  13
       5.2.3.  IP address pseudonymization and anonymization methods  14
       5.2.4.  Pseudonymization, anonymization or discarding of
               other correlation data  . . . . . . . . . . . . . . .  14
       5.2.5.  Cache snooping  . . . . . . . . . . . . . . . . . . .  15
     5.3.  Data sent onwards from the server . . . . . . . . . . . .  15
       5.3.1.  Protocol recommendations  . . . . . . . . . . . . . .  15
       5.3.2.  Client query obfuscation  . . . . . . . . . . . . . .  16
       5.3.3.  Data sharing  . . . . . . . . . . . . . . . . . . . .  17
   6.  DNS privacy policy and practice statement . . . . . . . . . .  17
     6.1.  Recommended contents of a DPPPS . . . . . . . . . . . . .  18
     6.2.  Current policy and privacy statements . . . . . . . . . .  19
       6.2.1.  Quad9 . . . . . . . . . . . . . . . . . . . . . . . .  19
       6.2.2.  Cloudflare  . . . . . . . . . . . . . . . . . . . . .  19
       6.2.3.  Google  . . . . . . . . . . . . . . . . . . . . . . .  20
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