DNS Query Name Minimisation to Improve Privacy
draft-ietf-dnsop-rfc7816bis-04
Network Working Group S. Bortzmeyer
Internet-Draft AFNIC
Obsoletes: 7816 (if approved) R. Dolmans
Intended status: Standards Track NLnet Labs
Expires: September 10, 2020 P. Hoffman
ICANN
March 9, 2020
DNS Query Name Minimisation to Improve Privacy
draft-ietf-dnsop-rfc7816bis-04
Abstract
This document describes techniques called "QNAME minimisation" to
improve DNS privacy, where the DNS resolver no longer always sends
the full original QNAME to the upstream name server. This document
obsoletes RFC 7816.
This document is part of the IETF DNSOP (DNS Operations) Working
Group. The source of the document, as well as a list of open issues,
is at <https://framagit.org/bortzmeyer/rfc7816-bis>
NOTE FOR THE DNSOP WORKING GROUP: There is still much work to be done
in this draft. Future versions of this draft will contain
descriptions of different minimisation implementation choices that
have been made since the RFC 7816 first came out, as well as
deployment experience.
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 September 10, 2020.
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Table of Contents
1. Introduction and Background . . . . . . . . . . . . . . . . . 2
1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
2. Description of QNAME Minimisation . . . . . . . . . . . . . . 3
2.1. Algorithm to Perform Aggressive Method QNAME Minimisation 5
3. QNAME Minimisation Examples . . . . . . . . . . . . . . . . . 6
4. Limit number of queries . . . . . . . . . . . . . . . . . . . 7
5. Operational Considerations . . . . . . . . . . . . . . . . . 8
6. Performance Considerations . . . . . . . . . . . . . . . . . 10
7. Alternative Methods for QNAME Minimisation . . . . . . . . . 10
8. Results of the Experimentation . . . . . . . . . . . . . . . 11
9. Security Considerations . . . . . . . . . . . . . . . . . . . 11
10. Implementation Status . . . . . . . . . . . . . . . . . . . . 11
11. References . . . . . . . . . . . . . . . . . . . . . . . . . 12
11.1. Normative References . . . . . . . . . . . . . . . . . . 12
11.2. Informative References . . . . . . . . . . . . . . . . . 13
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 15
Changes from RFC 7816 . . . . . . . . . . . . . . . . . . . . . . 15
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 15
1. Introduction and Background
The problem statement for this document and its predecessor [RFC7816]
is described in [I-D.bortzmeyer-dprive-rfc7626-bis]. The terminology
("QNAME", "resolver", etc.) is defined in
[I-D.ietf-dnsop-terminology-bis]. This specific solution is not
intended to fully solve the DNS privacy problem; instead, it should
be viewed as one tool amongst many.
QNAME minimisation follows the principle explained in Section 6.1 of
[RFC6973]: the less data you send out, the fewer privacy problems
you have.
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Before QNAME minimisation, when a resolver received the query "What
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