DNS Privacy Considerations
draft-ietf-dprive-rfc7626-bis-08
| Document | Type | Active Internet-Draft (dprive WG) | |
|---|---|---|---|
| Author | Tim Wicinski | ||
| Last updated | 2020-12-07 (latest revision 2020-10-16) | ||
| Replaces | draft-bortzmeyer-dprive-rfc7626-bis | ||
| Stream | Internent Engineering Task Force (IETF) | ||
| Intended RFC status | Informational | ||
| Formats | plain text xml pdf htmlized (tools) htmlized bibtex | ||
| Reviews | |||
| Stream | WG state | Submitted to IESG for Publication | |
| Document shepherd | Brian Haberman | ||
| Shepherd write-up | Show (last changed 2020-02-04) | ||
| IESG | IESG state | IESG Evaluation::Revised I-D Needed | |
| Action Holders |
(None)
|
||
| Consensus Boilerplate | Yes | ||
| Telechat date |
Has a DISCUSS. Has enough positions to pass once DISCUSS positions are resolved. |
||
| Responsible AD | Éric Vyncke | ||
| Send notices to | Brian Haberman <brian@innovationslab.net>, dns-privacy@ietf.org | ||
| IANA | IANA review state | Version Changed - Review Needed | |
dprive T. Wicinski, Ed.
Internet-Draft October 15, 2020
Obsoletes: 7626 (if approved)
Intended status: Informational
Expires: April 18, 2021
DNS Privacy Considerations
draft-ietf-dprive-rfc7626-bis-08
Abstract
This document describes the privacy issues associated with the use of
the DNS by Internet users. It is intended to be an analysis of the
present situation and does not prescribe solutions. This document
obsoletes RFC 7626.
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-
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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 April 18, 2021.
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
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Wicinski Expires April 18, 2021 [Page 1]
Internet-Draft DNS Privacy Considerations October 2020
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3. Risks . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4. Risks in the DNS Data . . . . . . . . . . . . . . . . . . . . 6
4.1. The Public Nature of DNS Data . . . . . . . . . . . . . . 6
4.2. Data in the DNS Request . . . . . . . . . . . . . . . . . 6
4.2.1. Data in the DNS Payload . . . . . . . . . . . . . . . 8
4.3. Cache Snooping . . . . . . . . . . . . . . . . . . . . . 8
5. Risks On the Wire . . . . . . . . . . . . . . . . . . . . . . 8
5.1. Unencrypted Transports . . . . . . . . . . . . . . . . . 8
5.2. Encrypted Transports . . . . . . . . . . . . . . . . . . 10
6. Risks in the Servers . . . . . . . . . . . . . . . . . . . . 11
6.1. In the Recursive Resolvers . . . . . . . . . . . . . . . 12
6.1.1. Resolver Selection . . . . . . . . . . . . . . . . . 12
6.1.2. Active Attacks on Resolver Configuration . . . . . . 14
6.1.3. Blocking of User Selected DNS Resolution Services . . 14
6.1.4. Encrypted Transports and Recursive Resolvers . . . . 15
6.2. In the Authoritative Name Servers . . . . . . . . . . . . 16
7. Other risks . . . . . . . . . . . . . . . . . . . . . . . . . 17
7.1. Re-identification and Other Inferences . . . . . . . . . 17
7.2. More Information . . . . . . . . . . . . . . . . . . . . 18
8. Actual "Attacks" . . . . . . . . . . . . . . . . . . . . . . 18
9. Legalities . . . . . . . . . . . . . . . . . . . . . . . . . 19
10. Security Considerations . . . . . . . . . . . . . . . . . . . 19
11. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 19
12. Contributions . . . . . . . . . . . . . . . . . . . . . . . . 19
13. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 19
14. References . . . . . . . . . . . . . . . . . . . . . . . . . 19
14.1. Normative References . . . . . . . . . . . . . . . . . . 20
14.2. Informative References . . . . . . . . . . . . . . . . . 20
14.3. URIs . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Appendix A. Updates since RFC7626 . . . . . . . . . . . . . . . 27
Appendix B. Changelog . . . . . . . . . . . . . . . . . . . . . 27
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 29
1. Introduction
This document is an analysis of the DNS privacy issues, in the spirit
of Section 8 of [RFC6973].
The Domain Name System (DNS) is specified in [RFC1034], [RFC1035],
and many later RFCs, which have never been consolidated. It is one
of the most important infrastructure components of the Internet and
often ignored or misunderstood by Internet users (and even by many
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