Arm's Platform Security Architecture (PSA) Attestation Token
draft-tschofenig-rats-psa-token-04

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RATS                                                  H. Tschofenig, Ed.
Internet-Draft                                                  S. Frost
Intended status: Standards Track                             M. Brossard
Expires: May 23, 2020                                            A. Shaw
                                                              T. Fossati
                                                             Arm Limited
                                                       November 20, 2019

      Arm's Platform Security Architecture (PSA) Attestation Token
                   draft-tschofenig-rats-psa-token-04

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 IoT systems.

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

   At its core, the CWT (COSE Web Token) format is used and populated
   with a set of claims, in a way similar to EAT (Entity Attestation
   Token).  This specification describes what claims are used by PSA
   compliant systems 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 May 23, 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
   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
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   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.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
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   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
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   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Conventions and Terminology . . . . . . . . . . . . . . . . .   4
     2.1.  Glossary  . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Information Model . . . . . . . . . . . . . . . . . . . . . .   5
     3.1.  PSA Lifecycle States  . . . . . . . . . . . . . . . . . .   7
     3.2.  PSA Software Components . . . . . . . . . . . . . . . . .   7
   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