DNS Privacy Considerations
draft-ietf-dprive-rfc7626-bis-09
| Document | Type | Active Internet-Draft (dprive WG) | ||
|---|---|---|---|---|
| Author | Tim Wicinski | |||
| Last updated | 2021-04-01 (latest revision 2021-03-09) | |||
| Replaces | draft-bortzmeyer-dprive-rfc7626-bis | |||
| Stream | Internet 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 | RFC Ed Queue | ||
| Action Holders |
(None)
|
|||
| Consensus Boilerplate | Yes | |||
| Telechat date | ||||
| Responsible AD | Éric Vyncke | |||
| Send notices to | Brian Haberman <brian@innovationslab.net>, dns-privacy@ietf.org | |||
| IANA | IANA review state | Version Changed - Review Needed | ||
| IANA action state | No IANA Actions | |||
| RFC Editor | RFC Editor state | RFC-EDITOR | ||
| Details | ||||
dprive T. Wicinski, Ed.
Internet-Draft March 9, 2021
Obsoletes: 7626 (if approved)
Intended status: Informational
Expires: September 10, 2021
DNS Privacy Considerations
draft-ietf-dprive-rfc7626-bis-09
Abstract
This document describes the privacy issues associated with the use of
the DNS by Internet users. It provides general observations about
typical current privacy practices. 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-
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, 2021.
Copyright Notice
Copyright (c) 2021 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
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
Wicinski Expires September 10, 2021 [Page 1]
Internet-Draft DNS Privacy Considerations March 2021
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
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 DNS Resolution Services . . . . . . . . . 15
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 . . . . . . . . . . . . . . . . . . . . . . . . . 20
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 . . . . . . . . . . . . . . . . . . . . . . . . 30
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
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