A Concise Binary Object Representation (CBOR)-based Serialization Format for the Software Updates for Internet of Things (SUIT) Manifest
draft-ietf-suit-manifest-09

Document Type Active Internet-Draft (suit WG)
Authors Brendan Moran  , Hannes Tschofenig  , Henk Birkholz  , Koen Zandberg 
Last updated 2020-07-13
Replaces draft-moran-suit-manifest
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Document shepherd David Waltermire
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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
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   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

   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
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   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  . . . . . . . . . . . . . . . . . . . . . . . .  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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