A Concise Binary Object Representation (CBOR)-based Serialization Format for the Software Updates for Internet of Things (SUIT) Manifest
draft-ietf-suit-manifest-12
SUIT B. Moran
Internet-Draft H. Tschofenig
Intended status: Standards Track Arm Limited
Expires: August 26, 2021 H. Birkholz
Fraunhofer SIT
K. Zandberg
Inria
February 22, 2021
A Concise Binary Object Representation (CBOR)-based Serialization Format
for the Software Updates for Internet of Things (SUIT) Manifest
draft-ietf-suit-manifest-12
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
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 August 26, 2021.
Copyright Notice
Copyright (c) 2021 IETF Trust and the persons identified as the
document authors. All rights reserved.
Moran, et al. Expires August 26, 2021 [Page 1]
Internet-Draft CBOR-based SUIT Manifest February 2021
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(https://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.
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 . . . . . . . . . . . . . . . . . . . . . . . . 13
5.2. Delegation Chains . . . . . . . . . . . . . . . . . . . . 13
5.3. Authentication Block . . . . . . . . . . . . . . . . . . 13
5.4. Manifest . . . . . . . . . . . . . . . . . . . . . . . . 14
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 . . . . . . . . . . . 20
6.4. Abstract Machine Description . . . . . . . . . . . . . . 20
6.5. Special Cases of Component Index and Dependency Index . . 23
6.6. Serialized Processing Interpreter . . . . . . . . . . . . 24
6.7. Parallel Processing Interpreter . . . . . . . . . . . . . 25
6.8. Processing Dependencies . . . . . . . . . . . . . . . . . 25
6.9. Multiple Manifest Processors . . . . . . . . . . . . . . 26
7. Creating Manifests . . . . . . . . . . . . . . . . . . . . . 27
Show full document text