A Concise Binary Object Representation (CBOR)-based Serialization Format for the Software Updates for Internet of Things (SUIT) Manifest
draft-ietf-suit-manifest-09
SUIT B. Moran
Internet-Draft H. Tschofenig
Intended status: Standards Track Arm Limited
Expires: January 14, 2021 H. Birkholz
Fraunhofer SIT
K. Zandberg
Inria
July 13, 2020
A Concise Binary Object Representation (CBOR)-based Serialization Format
for the Software Updates for Internet of Things (SUIT) Manifest
draft-ietf-suit-manifest-09
Abstract
This specification describes the format of a manifest. A manifest is
a bundle of metadata about the firmware for an IoT device, where to
find the firmware, the devices to which it applies, and cryptographic
information protecting the manifest. Firmware updates and secure
boot both tend to use sequences of common operations, so the manifest
encodes those sequences of operations, rather than declaring the
metadata. The manifest also serves as a building block for secure
boot.
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-
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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 14, 2021.
Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved.
Moran, et al. Expires January 14, 2021 [Page 1]
Internet-Draft CBOR-based SUIT Manifest July 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 4
2. Conventions and Terminology . . . . . . . . . . . . . . . . . 6
3. How to use this Document . . . . . . . . . . . . . . . . . . 8
4. Background . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1. IoT Firmware Update Constraints . . . . . . . . . . . . . 9
4.2. SUIT Workflow Model . . . . . . . . . . . . . . . . . . . 10
5. Metadata Structure Overview . . . . . . . . . . . . . . . . . 11
5.1. Envelope . . . . . . . . . . . . . . . . . . . . . . . . 12
5.2. Delegation Chains . . . . . . . . . . . . . . . . . . . . 12
5.3. Authentication Block . . . . . . . . . . . . . . . . . . 13
5.4. Manifest . . . . . . . . . . . . . . . . . . . . . . . . 13
5.4.1. Critical Metadata . . . . . . . . . . . . . . . . . . 13
5.4.2. Common . . . . . . . . . . . . . . . . . . . . . . . 13
5.4.3. Command Sequences . . . . . . . . . . . . . . . . . . 14
5.4.4. Integrity Check Values . . . . . . . . . . . . . . . 14
5.4.5. Human-Readable Text . . . . . . . . . . . . . . . . . 14
5.5. Severable Elements . . . . . . . . . . . . . . . . . . . 15
5.6. Integrated Dependencies and Payloads . . . . . . . . . . 15
6. Interpreter Behavior . . . . . . . . . . . . . . . . . . . . 15
6.1. Interpreter Setup . . . . . . . . . . . . . . . . . . . . 16
6.2. Required Checks . . . . . . . . . . . . . . . . . . . . . 17
6.2.1. Minimizing Signature Verifications . . . . . . . . . 18
6.3. Interpreter Fundamental Properties . . . . . . . . . . . 19
6.4. Abstract Machine Description . . . . . . . . . . . . . . 19
6.5. Special Cases of Component Index and Dependency Index . . 21
6.6. Serialized Processing Interpreter . . . . . . . . . . . . 22
6.7. Parallel Processing Interpreter . . . . . . . . . . . . . 22
6.8. Processing Dependencies . . . . . . . . . . . . . . . . . 23
6.9. Multiple Manifest Processors . . . . . . . . . . . . . . 23
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