Application-Layer TLS
draft-friel-tls-atls-03
Network Working Group O. Friel
Internet-Draft R. Barnes
Intended status: Standards Track M. Pritikin
Expires: January 9, 2020 Cisco
H. Tschofenig
Arm Ltd.
M. Baugher
Consultant
July 08, 2019
Application-Layer TLS
draft-friel-tls-atls-03
Abstract
This document specifies how TLS and DTLS can be used at the
application layer for the purpose of establishing secure end-to-end
encrypted communication security.
Encodings for carrying TLS and DTLS payloads are specified for HTTP
and CoAP to improve interoperability. While the use of TLS and DTLS
is straight forward we present multiple deployment scenarios to
illustrate the need for end-to-end application layer encryption and
the benefits of reusing a widely deployed and readily available
protocol. Application software architectures for building, and
network architectures for deploying application layer TLS are
outlined.
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 January 9, 2020.
Friel, et al. Expires January 9, 2020 [Page 1]
Internet-Draft ATLS July 2019
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Application Layer End-to-End Security Use Cases . . . . . . . 4
3.1. Bootstrapping Devices . . . . . . . . . . . . . . . . . . 4
3.2. Constrained Devices . . . . . . . . . . . . . . . . . . . 5
4. ATLS Goals . . . . . . . . . . . . . . . . . . . . . . . . . 7
5. Architecture Overview . . . . . . . . . . . . . . . . . . . . 7
5.1. Application Architecture . . . . . . . . . . . . . . . . 7
5.2. Functional Design . . . . . . . . . . . . . . . . . . . . 13
5.3. Network Architecture . . . . . . . . . . . . . . . . . . 15
6. ATLS Session Establishment . . . . . . . . . . . . . . . . . 16
7. ATLS over HTTP Transport . . . . . . . . . . . . . . . . . . 18
7.1. Protocol Summary . . . . . . . . . . . . . . . . . . . . 18
7.2. Content-Type Header . . . . . . . . . . . . . . . . . . . 19
7.3. HTTP Status Codes . . . . . . . . . . . . . . . . . . . . 19
7.4. ATLS Session Tracking . . . . . . . . . . . . . . . . . . 19
7.5. Session Establishment and Key Exporting . . . . . . . . . 19
7.6. Illustrative ATLS over HTTP Session Establishment . . . . 19
7.7. ATLS and HTTP CONNECT . . . . . . . . . . . . . . . . . . 20
8. ATLS over CoAP Transport . . . . . . . . . . . . . . . . . . 23
9. Key Exporting and Application Data Encryption . . . . . . . . 24
9.1. OSCORE . . . . . . . . . . . . . . . . . . . . . . . . . 25
9.2. COSE . . . . . . . . . . . . . . . . . . . . . . . . . . 26
10. TLS Ciphersuite to COSE/OSCORE Algorithm Mapping . . . . . . 26
11. TLS Extensions . . . . . . . . . . . . . . . . . . . . . . . 27
11.1. The "oscore_connection_id" Extension . . . . . . . . . . 27
11.2. The "cose_ext" Extension . . . . . . . . . . . . . . . . 27
12. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 28
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