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 | 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 | |
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- 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 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 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. 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 manyShow full document text