The Datagram Transport Layer Security (DTLS) Protocol Version 1.3
draft-ietf-tls-dtls13-02
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2017-10-31
(latest revision 2017-10-29)
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draft-rescorla-tls-dtls13
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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 2, 2018 N. Modadugu
Google, Inc.
October 29, 2017
The Datagram Transport Layer Security (DTLS) Protocol Version 1.3
draft-ietf-tls-dtls13-02
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. 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 http://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 2, 2018.
Copyright Notice
Copyright (c) 2017 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
Rescorla, et al. Expires May 2, 2018 [Page 1]
Internet-Draft DTLS 1.3 October 2017
(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.
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 Rational and Overview . . . . . . . . . . . . . . 5
3.1. Packet Loss . . . . . . . . . . . . . . . . . . . . . . . 6
3.1.1. Reordering . . . . . . . . . . . . . . . . . . . . . 6
3.1.2. Message Size . . . . . . . . . . . . . . . . . . . . 7
3.2. Replay Detection . . . . . . . . . . . . . . . . . . . . 7
4. The DTLS Record Layer . . . . . . . . . . . . . . . . . . . . 7
4.1. Sequence Number Handling . . . . . . . . . . . . . . . . 9
4.1.1. Determining the Header Format . . . . . . . . . . . . 10
4.1.2. Reconstructing the Sequence Number and Epoch . . . . 10
4.2. Transport Layer Mapping . . . . . . . . . . . . . . . . . 11
4.3. PMTU Issues . . . . . . . . . . . . . . . . . . . . . . . 12
4.4. Record Payload Protection . . . . . . . . . . . . . . . . 13
4.4.1. Anti-Replay . . . . . . . . . . . . . . . . . . . . . 13
4.4.2. Handling Invalid Records . . . . . . . . . . . . . . 14
5. The DTLS Handshake Protocol . . . . . . . . . . . . . . . . . 14
5.1. Denial-of-Service Countermeasures . . . . . . . . . . . . 15
5.2. DTLS Handshake Message Format . . . . . . . . . . . . . . 18
5.3. ClientHello Message . . . . . . . . . . . . . . . . . . . 20
5.4. Handshake Message Fragmentation and Reassembly . . . . . 21
5.5. DTLS Handshake Flights . . . . . . . . . . . . . . . . . 22
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