The Datagram Transport Layer Security (DTLS) Protocol Version 1.3
draft-ietf-tls-dtls13-34
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Active Internet-Draft (tls WG)
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2019-11-19
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draft-rescorla-tls-dtls13
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IETF
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Proposed Standard
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Submitted to IESG for Publication
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Document shepherd |
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Sean Turner
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(last changed 2019-11-11)
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Yes
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Benjamin Kaduk
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Sean Turner <sean@sn3rd.com>
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TLS E. Rescorla
Internet-Draft RTFM, Inc.
Obsoletes: 6347 (if approved) H. Tschofenig
Intended status: Standards Track Arm Limited
Expires: May 22, 2020 N. Modadugu
Google, Inc.
November 19, 2019
The Datagram Transport Layer Security (DTLS) Protocol Version 1.3
draft-ietf-tls-dtls13-34
Abstract
This document specifies Version 1.3 of the Datagram Transport Layer
Security (DTLS) protocol. DTLS 1.3 allows client/server applications
to communicate over the Internet in a way that is designed to prevent
eavesdropping, tampering, and message forgery.
The DTLS 1.3 protocol is intentionally based on the Transport Layer
Security (TLS) 1.3 protocol and provides equivalent security
guarantees with the exception of order protection/non-replayability.
Datagram semantics of the underlying transport are preserved by the
DTLS protocol.
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 May 22, 2020.
Copyright Notice
Copyright (c) 2019 IETF Trust and the persons identified as the
document authors. All rights reserved.
Rescorla, et al. Expires May 22, 2020 [Page 1]
Internet-Draft DTLS 1.3 November 2019
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
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include Simplified BSD License text as described in Section 4.e of
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described in the Simplified BSD License.
This document may contain material from IETF Documents or IETF
Contributions published or made publicly available before November
10, 2008. The person(s) controlling the copyright in some of this
material may not have granted the IETF Trust the right to allow
modifications of such material outside the IETF Standards Process.
Without obtaining an adequate license from the person(s) controlling
the copyright in such materials, this document may not be modified
outside the IETF Standards Process, and derivative works of it may
not be created outside the IETF Standards Process, except to format
it for publication as an RFC or to translate it into languages other
than English.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Conventions and Terminology . . . . . . . . . . . . . . . . . 4
3. DTLS Design Rationale and Overview . . . . . . . . . . . . . 5
3.1. Packet Loss . . . . . . . . . . . . . . . . . . . . . . . 6
3.2. Reordering . . . . . . . . . . . . . . . . . . . . . . . 7
3.3. Message Size . . . . . . . . . . . . . . . . . . . . . . 7
3.4. Replay Detection . . . . . . . . . . . . . . . . . . . . 7
4. The DTLS Record Layer . . . . . . . . . . . . . . . . . . . . 7
4.1. Determining the Header Format . . . . . . . . . . . . . . 11
4.2. Sequence Number and Epoch . . . . . . . . . . . . . . . . 11
4.2.1. Processing Guidelines . . . . . . . . . . . . . . . . 11
4.2.2. Reconstructing the Sequence Number and Epoch . . . . 12
4.2.3. Sequence Number Encryption . . . . . . . . . . . . . 13
4.3. Transport Layer Mapping . . . . . . . . . . . . . . . . . 14
4.4. PMTU Issues . . . . . . . . . . . . . . . . . . . . . . . 14
4.5. Record Payload Protection . . . . . . . . . . . . . . . . 16
4.5.1. Anti-Replay . . . . . . . . . . . . . . . . . . . . . 16
4.5.2. Handling Invalid Records . . . . . . . . . . . . . . 17
5. The DTLS Handshake Protocol . . . . . . . . . . . . . . . . . 17
5.1. Denial-of-Service Countermeasures . . . . . . . . . . . . 18
5.2. DTLS Handshake Message Format . . . . . . . . . . . . . . 21
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