A Firmware Update Architecture for Internet of Things
draft-ietf-suit-architecture-14

Document Type Active Internet-Draft (suit WG)
Authors Brendan Moran  , Hannes Tschofenig  , David Brown  , Milosch Meriac 
Last updated 2020-11-05 (latest revision 2020-10-21)
Replaces draft-moran-suit-architecture
Stream IETF
Intended RFC status Informational
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Reviews
Stream WG state Submitted to IESG for Publication (wg milestone: Nov 2019 - Submit architecture ... )
Document shepherd Russ Housley
Shepherd write-up Show (last changed 2020-06-09)
IESG IESG state Approved-announcement to be sent::Revised I-D Needed
Consensus Boilerplate Yes
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Responsible AD Roman Danyliw
Send notices to Russ Housley <housley@vigilsec.com>
IANA IANA review state IANA OK - No Actions Needed
SUIT                                                            B. Moran
Internet-Draft                                             H. Tschofenig
Intended status: Informational                               Arm Limited
Expires: April 24, 2021                                         D. Brown
                                                                  Linaro
                                                               M. Meriac
                                                              Consultant
                                                        October 21, 2020

         A Firmware Update Architecture for Internet of Things
                    draft-ietf-suit-architecture-14

Abstract

   Vulnerabilities in Internet of Things (IoT) devices have raised the
   need for a reliable and secure firmware update mechanism suitable for
   devices with resource constraints.  Incorporating such an update
   mechanism is a fundamental requirement for fixing vulnerabilities but
   it also enables other important capabilities such as updating
   configuration settings as well as adding new functionality.

   In addition to the definition of terminology and an architecture this
   document motivates the standardization of a manifest format as a
   transport-agnostic means for describing and protecting firmware
   updates.

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 April 24, 2021.

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Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   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  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions and Terminology . . . . . . . . . . . . . . . . .   5
     2.1.  Terms . . . . . . . . . . . . . . . . . . . . . . . . . .   5
     2.2.  Stakeholders  . . . . . . . . . . . . . . . . . . . . . .   6
     2.3.  Functions . . . . . . . . . . . . . . . . . . . . . . . .   7
   3.  Architecture  . . . . . . . . . . . . . . . . . . . . . . . .   8
   4.  Invoking the Firmware . . . . . . . . . . . . . . . . . . . .  12
     4.1.  The Bootloader  . . . . . . . . . . . . . . . . . . . . .  14
   5.  Types of IoT Devices  . . . . . . . . . . . . . . . . . . . .  15
     5.1.  Single MCU  . . . . . . . . . . . . . . . . . . . . . . .  15
     5.2.  Single CPU with Secure - Normal Mode Partitioning . . . .  16
     5.3.  Symmetric Multiple CPUs . . . . . . . . . . . . . . . . .  16
     5.4.  Dual CPU, shared memory . . . . . . . . . . . . . . . . .  16
     5.5.  Dual CPU, other bus . . . . . . . . . . . . . . . . . . .  17
   6.  Manifests . . . . . . . . . . . . . . . . . . . . . . . . . .  17
   7.  Securing Firmware Updates . . . . . . . . . . . . . . . . . .  19
   8.  Example . . . . . . . . . . . . . . . . . . . . . . . . . . .  20
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  25
   10. Security Considerations . . . . . . . . . . . . . . . . . . .  25
   11. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  25
   12. Informative References  . . . . . . . . . . . . . . . . . . .  26
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  27

1.  Introduction

   Firmware updates can help to fix security vulnerabilities and are
   considered to be an important building block in securing IoT devices.
   Due to rising concerns about insecure IoT devices the Internet
   Architecture Board (IAB) organized a 'Workshop on Internet of Things
   (IoT) Software Update (IOTSU)', which took place at Trinity College
   Dublin, Ireland on the 13th and 14th of June, 2016 to take a look at

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