Protecting Internet Key Exchange Protocol Version 2 (IKEv2) Implementations from Distributed Denial-of-Service Attacks
RFC 8019
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RFC - Proposed Standard
(November 2016; No errata)
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Last updated |
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2016-11-15
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IETF
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bibtex
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WG state
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Submitted to IESG for Publication
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Document shepherd |
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David Waltermire
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Shepherd write-up |
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Show
(last changed 2016-08-18)
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IESG state |
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RFC 8019 (Proposed Standard)
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Consensus Boilerplate |
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Yes
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Responsible AD |
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Kathleen Moriarty
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Send notices to |
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"David Waltermire" <david.waltermire@nist.gov>
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Version Changed - Review Needed
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RFC-Ed-Ack
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Internet Engineering Task Force (IETF) Y. Nir
Request for Comments: 8019 Check Point
Category: Standards Track V. Smyslov
ISSN: 2070-1721 ELVIS-PLUS
November 2016
Protecting Internet Key Exchange Protocol Version 2 (IKEv2)
Implementations from Distributed Denial-of-Service Attacks
Abstract
This document recommends implementation and configuration best
practices for Internet Key Exchange Protocol version 2 (IKEv2)
Responders, to allow them to resist Denial-of-Service and Distributed
Denial-of-Service attacks. Additionally, the document introduces a
new mechanism called "Client Puzzles" that helps accomplish this
task.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 7841.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc8019.
Copyright Notice
Copyright (c) 2016 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
(http://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.
Nir & Smyslov Standards Track [Page 1]
RFC 8019 DDoS Protection for IKEv2 November 2016
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Conventions Used in This Document . . . . . . . . . . . . . . 3
3. The Vulnerability . . . . . . . . . . . . . . . . . . . . . . 3
4. Defense Measures While the IKE SA Is Being Created . . . . . 6
4.1. Retention Periods for Half-Open SAs . . . . . . . . . . . 6
4.2. Rate Limiting . . . . . . . . . . . . . . . . . . . . . . 7
4.3. The Stateless Cookie . . . . . . . . . . . . . . . . . . 8
4.4. Puzzles . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.5. Session Resumption . . . . . . . . . . . . . . . . . . . 11
4.6. Keeping Computed Shared Keys . . . . . . . . . . . . . . 11
4.7. Preventing "Hash and URL" Certificate Encoding Attacks . 11
4.8. IKE Fragmentation . . . . . . . . . . . . . . . . . . . . 12
5. Defense Measures after an IKE SA Is Created . . . . . . . . . 12
6. Plan for Defending a Responder . . . . . . . . . . . . . . . 14
7. Using Puzzles in the Protocol . . . . . . . . . . . . . . . . 16
7.1. Puzzles in IKE_SA_INIT Exchange . . . . . . . . . . . . . 16
7.1.1. Presenting a Puzzle . . . . . . . . . . . . . . . . . 17
7.1.2. Solving a Puzzle and Returning the Solution . . . . . 19
7.1.3. Computing a Puzzle . . . . . . . . . . . . . . . . . 20
7.1.4. Analyzing Repeated Request . . . . . . . . . . . . . 21
7.1.5. Deciding Whether to Serve the Request . . . . . . . . 22
7.2. Puzzles in an IKE_AUTH Exchange . . . . . . . . . . . . . 23
7.2.1. Presenting the Puzzle . . . . . . . . . . . . . . . . 24
7.2.2. Solving the Puzzle and Returning the Solution . . . . 24
7.2.3. Computing the Puzzle . . . . . . . . . . . . . . . . 25
7.2.4. Receiving the Puzzle Solution . . . . . . . . . . . . 25
8. Payload Formats . . . . . . . . . . . . . . . . . . . . . . . 26
8.1. PUZZLE Notification . . . . . . . . . . . . . . . . . . . 26
8.2. Puzzle Solution Payload . . . . . . . . . . . . . . . . . 27
9. Operational Considerations . . . . . . . . . . . . . . . . . 28
10. Security Considerations . . . . . . . . . . . . . . . . . . . 28
11. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 30
12. References . . . . . . . . . . . . . . . . . . . . . . . . . 30
12.1. Normative References . . . . . . . . . . . . . . . . . . 30
12.2. Informative References . . . . . . . . . . . . . . . . . 31
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 31
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 32
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