Arm's Platform Security Architecture (PSA) Attestation Token
draft-tschofenig-rats-psa-token-02

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RATS                                                  H. Tschofenig, Ed.
Internet-Draft                                                  S. Frost
Intended status: Standards Track                             M. Brossard
Expires: January 9, 2020                                         A. Shaw
                                                              T. Fossati
                                                             Arm Limited
                                                           July 08, 2019

      Arm's Platform Security Architecture (PSA) Attestation Token
                   draft-tschofenig-rats-psa-token-02

Abstract

   The insecurity of IoT systems is a widely known and discussed
   problem.  The Arm Platform Security Architecture (PSA) is being
   developed to address this challenge by making it easier to build
   secure systems.

   This document specifies token format and claims used in the
   attestation API of the Arm Platform Security Architecture (PSA).

   At its core, the Entity Attestation Token (EAT) format is used and
   populated with a set of claims.  This specification describes what
   claims are used by the PSA and what has been implemented within Arm
   Trusted Firmware-M.

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 January 9, 2020.

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Copyright Notice

   Copyright (c) 2019 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
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   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
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   than English.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Conventions and Terminology . . . . . . . . . . . . . . . . .   4
     2.1.  Glossary  . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Information Model . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Token Encoding  . . . . . . . . . . . . . . . . . . . . . . .   9
   5.  Claims  . . . . . . . . . . . . . . . . . . . . . . . . . . .   9
   6.  Example . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
   7.  Security and Privacy Considerations . . . . . . . . . . . . .  14
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  14
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  15
   Appendix A.  Contributors . . . . . . . . . . . . . . . . . . . .  16
   Appendix B.  Reference Implementation . . . . . . . . . . . . . .  16
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  16

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1.  Introduction

   Modern hardware for Internet of Things devices contain trusted
   execution environments and in case of the Arm v8-M architecture
   TrustZone support.  TrustZone on these low end microcontrollers