An Information Model for Firmware Updates in IoT Devices
draft-ietf-suit-information-model-08
SUIT B. Moran
Internet-Draft H. Tschofenig
Intended status: Informational Arm Limited
Expires: May 1, 2021 H. Birkholz
Fraunhofer SIT
October 28, 2020
An Information Model for Firmware Updates in IoT Devices
draft-ietf-suit-information-model-08
Abstract
Vulnerabilities with Internet of Things (IoT) devices have raised the
need for a reliable and secure firmware update mechanism that is also
suitable for constrained devices. Ensuring that devices function and
remain secure over their service life requires such an update
mechanism to fix vulnerabilities, to update configuration settings,
as well as adding new functionality.
One component of such a firmware update is a concise and machine-
processable meta-data document, or manifest, that describes the
firmware image(s) and offers appropriate protection. This document
describes the information that must be present in the manifest.
Status of This Memo
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This Internet-Draft will expire on May 1, 2021.
Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved.
Moran, et al. Expires May 1, 2021 [Page 1]
Internet-Draft A Firmware Manifest Information Model October 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 5
2. Conventions and Terminology . . . . . . . . . . . . . . . . . 5
2.1. Requirements Notation . . . . . . . . . . . . . . . . . . 6
3. Manifest Information Elements . . . . . . . . . . . . . . . . 6
3.1. Manifest Element: Version ID of the manifest structure . 6
3.2. Manifest Element: Monotonic Sequence Number . . . . . . . 6
3.3. Manifest Element: Vendor ID . . . . . . . . . . . . . . . 7
3.3.1. Example: Domain Name-based UUIDs . . . . . . . . . . 7
3.4. Manifest Element: Class ID . . . . . . . . . . . . . . . 7
3.4.1. Example 1: Different Classes . . . . . . . . . . . . 8
3.4.2. Example 2: Upgrading Class ID . . . . . . . . . . . . 9
3.4.3. Example 3: Shared Functionality . . . . . . . . . . . 9
3.4.4. Example 4: White-labelling . . . . . . . . . . . . . 9
3.5. Manifest Element: Precursor Image Digest Condition . . . 10
3.6. Manifest Element: Required Image Version List . . . . . . 10
3.7. Manifest Element: Expiration Time . . . . . . . . . . . . 10
3.8. Manifest Element: Payload Format . . . . . . . . . . . . 11
3.9. Manifest Element: Processing Steps . . . . . . . . . . . 11
3.10. Manifest Element: Storage Location . . . . . . . . . . . 11
3.10.1. Example 1: Two Storage Locations . . . . . . . . . . 12
3.10.2. Example 2: File System . . . . . . . . . . . . . . . 12
3.10.3. Example 3: Flash Memory . . . . . . . . . . . . . . 12
3.11. Manifest Element: Component Identifier . . . . . . . . . 12
3.12. Manifest Element: Resource Indicator . . . . . . . . . . 12
3.13. Manifest Element: Payload Digests . . . . . . . . . . . . 13
3.14. Manifest Element: Size . . . . . . . . . . . . . . . . . 13
3.15. Manifest Envelope Element: Signature . . . . . . . . . . 13
3.16. Manifest Element: Additional installation instructions . 14
3.17. Manifest Element: Aliases . . . . . . . . . . . . . . . . 14
3.18. Manifest Element: Dependencies . . . . . . . . . . . . . 15
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