Recommendations for DNS Privacy Service Operators
draft-ietf-dprive-bcp-op-06

Document Type Active Internet-Draft (dprive WG)
Last updated 2019-12-04 (latest revision 2019-11-18)
Replaces draft-dickinson-dprive-bcp-op
Stream IETF
Intended RFC status Best Current Practice
Formats plain text pdf htmlized bibtex
Stream WG state Submitted to IESG for Publication
Document shepherd Tim Wicinski
Shepherd write-up Show (last changed 2019-11-17)
IESG IESG state AD Evaluation::Revised I-D Needed
Consensus Boilerplate Yes
Telechat date
Responsible AD √Čric Vyncke
Send notices to Tim Wicinski <tjw.ietf@gmail.com>
dprive                                                      S. Dickinson
Internet-Draft                                                Sinodun IT
Intended status: Best Current Practice                     B. Overeinder
Expires: May 21, 2020                               R. van Rijswijk-Deij
                                                              NLnet Labs
                                                               A. Mankin
                                                              Salesforce
                                                       November 18, 2019

           Recommendations for DNS Privacy Service Operators
                      draft-ietf-dprive-bcp-op-06

Abstract

   This document presents operational, policy and security
   considerations for DNS recursive resolver operators who choose to
   offer DNS Privacy services.  With these recommendations, the operator
   can make deliberate decisions regarding 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 a DNS
   Recursive Operator Privacy Statement (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 May 21, 2020.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Dickinson, et al.         Expires May 21, 2020                  [Page 1]
Internet-Draft     DNS Privacy Service Recommendations     November 2019

   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
   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  . . . . . . . . . . . . . . . . . . . . . . . .   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.  DNSSEC  . . . . . . . . . . . . . . . . . . . . . . .  11
       5.1.5.  Availability  . . . . . . . . . . . . . . . . . . . .  11
       5.1.6.  Service options . . . . . . . . . . . . . . . . . . .  12
       5.1.7.  Impact on DNS Privacy Service Operators . . . . . . .  12
       5.1.8.  Limitations of using a pure TLS proxy . . . . . . . .  13
     5.2.  Data at rest on the server  . . . . . . . . . . . . . . .  13
       5.2.1.  Data handling . . . . . . . . . . . . . . . . . . . .  13
       5.2.2.  Data minimization of network traffic  . . . . . . . .  14
       5.2.3.  IP address pseudonymization and anonymization methods  15
       5.2.4.  Pseudonymization, anonymization or discarding of
               other correlation data  . . . . . . . . . . . . . . .  17
       5.2.5.  Cache snooping  . . . . . . . . . . . . . . . . . . .  17
     5.3.  Data sent onwards from the server . . . . . . . . . . . .  18
       5.3.1.  Protocol recommendations  . . . . . . . . . . . . . .  18
       5.3.2.  Client query obfuscation  . . . . . . . . . . . . . .  19
       5.3.3.  Data sharing  . . . . . . . . . . . . . . . . . . . .  19
   6.  DNS Recursive Operator Privacy (DROP) statement . . . . . . .  20
     6.1.  Recommended contents of a DROP statement  . . . . . . . .  20
       6.1.1.  Policy  . . . . . . . . . . . . . . . . . . . . . . .  20
       6.1.2.  Practice  . . . . . . . . . . . . . . . . . . . . . .  21
     6.2.  Current policy and privacy statements . . . . . . . . . .  22
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