Interoperable Domain Name System (DNS) Server Cookies
draft-ietf-dnsop-server-cookies-03
DNSOP Working Group O. Sury
Internet-Draft Internet Systems Consortium
Updates: 7873 (if approved) W. Toorop
Intended status: Standards Track NLnet Labs
Expires: November 21, 2020 D. Eastlake 3rd
Futurewei Technologies
M. Andrews
Internet Systems Consortium
May 20, 2020
Interoperable Domain Name System (DNS) Server Cookies
draft-ietf-dnsop-server-cookies-03
Abstract
DNS cookies, as specified in RFC 7873, are a lightweight DNS
transaction security mechanism that provides limited protection to
DNS servers and clients against a variety of denial-of-service and
amplification, forgery, or cache poisoning attacks by off-path
attackers.
This document provides precise directions for creating Server Cookies
so that an anycast server set including diverse implementations will
interoperate with standard clients.
This document updates [RFC7873]
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 November 21, 2020.
Sury, et al. Expires November 21, 2020 [Page 1]
Internet-Draft server-cookies May 2020
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.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Contents of this document . . . . . . . . . . . . . . . . 3
1.2. Definitions . . . . . . . . . . . . . . . . . . . . . . . 4
2. Changes to [RFC7873] . . . . . . . . . . . . . . . . . . . . 4
3. Constructing a Client Cookie . . . . . . . . . . . . . . . . 4
4. Constructing a Server Cookie . . . . . . . . . . . . . . . . 5
4.1. The Version Sub-Field . . . . . . . . . . . . . . . . . . 6
4.2. The Reserved Sub-Field . . . . . . . . . . . . . . . . . 6
4.3. The Timestamp Sub-Field . . . . . . . . . . . . . . . . . 6
4.4. The Hash Sub-Field . . . . . . . . . . . . . . . . . . . 6
5. Updating the Server Secret . . . . . . . . . . . . . . . . . 7
6. Cookie Algorithms . . . . . . . . . . . . . . . . . . . . . . 8
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 8
8. Security and Privacy Considerations . . . . . . . . . . . . . 9
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 10
9.1. Normative References . . . . . . . . . . . . . . . . . . 10
9.2. Informative References . . . . . . . . . . . . . . . . . 10
Appendix A. Acknowledgements . . . . . . . . . . . . . . . . . . 11
Appendix B. Test vectors . . . . . . . . . . . . . . . . . . . . 11
B.1. Learning a new Server Cookie . . . . . . . . . . . . . . 11
B.2. The same client learning a renewed (fresh) Server Cookie 12
B.3. Another client learning a renewed Server Cookie . . . . . 13
B.4. IPv6 query with rolled over secret . . . . . . . . . . . 14
Appendix C. Implementation status . . . . . . . . . . . . . . . 15
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 15
1. Introduction
DNS cookies, as specified in [RFC7873], are a lightweight DNS
transaction security mechanism that provides limited protection to
DNS servers and clients against a variety of denial-of-service and
Sury, et al. Expires November 21, 2020 [Page 2]
Show full document text