A Concise Binary Object Representation (CBOR)-based Serialization Format for the Software Updates for Internet of Things (SUIT) Manifest
draft-ietf-suit-manifest-10
SUIT B. Moran
Internet-Draft H. Tschofenig
Intended status: Standards Track Arm Limited
Expires: May 6, 2021 H. Birkholz
Fraunhofer SIT
K. Zandberg
Inria
November 02, 2020
A Concise Binary Object Representation (CBOR)-based Serialization Format
for the Software Updates for Internet of Things (SUIT) Manifest
draft-ietf-suit-manifest-10
Abstract
This specification describes the format of a manifest. A manifest is
a bundle of metadata about code/data obtained by a recipient (chiefly
the firmware for an IoT device), where to find the that code/data,
the devices to which it applies, and cryptographic information
protecting the manifest. Software updates and Trusted Invocation
both tend to use sequences of common operations, so the manifest
encodes those sequences of operations, rather than declaring the
metadata.
Status of This Memo
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provisions of BCP 78 and BCP 79.
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material or to cite them other than as "work in progress."
This Internet-Draft will expire on May 6, 2021.
Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved.
Moran, et al. Expires May 6, 2021 [Page 1]
Internet-Draft CBOR-based SUIT Manifest November 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 . . . . . . . . . . . . . . . . . . . . 13
5.3. Authentication Block . . . . . . . . . . . . . . . . . . 13
5.4. Manifest . . . . . . . . . . . . . . . . . . . . . . . . 13
5.4.1. Critical Metadata . . . . . . . . . . . . . . . . . . 14
5.4.2. Common . . . . . . . . . . . . . . . . . . . . . . . 14
5.4.3. Command Sequences . . . . . . . . . . . . . . . . . . 14
5.4.4. Integrity Check Values . . . . . . . . . . . . . . . 15
5.4.5. Human-Readable Text . . . . . . . . . . . . . . . . . 15
5.5. Severable Elements . . . . . . . . . . . . . . . . . . . 15
5.6. Integrated Dependencies and Payloads . . . . . . . . . . 16
6. Manifest Processor Behavior . . . . . . . . . . . . . . . . . 16
6.1. Manifest Processor Setup . . . . . . . . . . . . . . . . 16
6.2. Required Checks . . . . . . . . . . . . . . . . . . . . . 17
6.2.1. Minimizing Signature Verifications . . . . . . . . . 19
6.3. Interpreter Fundamental Properties . . . . . . . . . . . 19
6.4. Abstract Machine Description . . . . . . . . . . . . . . 20
6.5. Special Cases of Component Index and Dependency Index . . 22
6.6. Serialized Processing Interpreter . . . . . . . . . . . . 24
6.7. Parallel Processing Interpreter . . . . . . . . . . . . . 24
6.8. Processing Dependencies . . . . . . . . . . . . . . . . . 25
6.9. Multiple Manifest Processors . . . . . . . . . . . . . . 25
7. Creating Manifests . . . . . . . . . . . . . . . . . . . . . 27
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