An Information Model for Assertions used in RATS
draft-birkholz-rats-information-model-00

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RATS Working Group                                           H. Birkholz
Internet-Draft                                                  M. Eckel
Intended status: Standards Track                          Fraunhofer SIT
Expires: January 9, 2020                                   July 08, 2019

            An Information Model for Assertions used in RATS
                draft-birkholz-rats-information-model-00

Abstract

   This document defines a standardized information model (IM) for
   assertions that can be used in remote attestation procedures (RATS).
   The information elements defined include attestation assertions which
   provide information about system components characteristics, as well
   as commonly used attributes and attribute structures that are
   required by protocols facilitating remote attestation.

Status of This Memo

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   This Internet-Draft will expire on January 9, 2020.

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   Copyright (c) 2019 IETF Trust and the persons identified as the
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Document Structure  . . . . . . . . . . . . . . . . . . .   3
   2.  RATS Information Elements . . . . . . . . . . . . . . . . . .   4
   3.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   4.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   8
   5.  Change Log  . . . . . . . . . . . . . . . . . . . . . . . . .   8
   6.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   8
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   Remote attestation procedures (RATS) are used to increase the trust
   in the trustworthiness of an attester.  This is typically
   accomplished by conveying attestation evidence from an attester to a
   verifier that is able to appraise the evidence.  The exact
   definitions of RATS roles, such as an attester or a verifier, are
   specified in the RATS architecture [I-D.birkholz-rats-architecture].
   This document defines the common information elements (IE) that are
   able to express the characteristics of an attester.  Ultimately,
   these IE can be used to compose attestation evidence (attestation
   assertions that are accompanied by a proof of their validity).

   In general, RATS convey information elements that:

   o  enable the functionality of remote attestation protocols,

   o  are able to express assertions about an attester's composition,
      configuration, or operational state,

   o  represent the provenance of assertions, including entities that
      provide assertions on behalf of the attester,

   o  compose a type of proof of validity with respect to other
      assertions, and that

   o  are either verifiable (via comparison with trusted reference
      values) or non-verifiable.

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1.1.  Document Structure

   Every information element listed is annotated with one or more of
   these attributes:

   Protocol (P):  This IE is used on a remote attestation protocol
      layer, typically on the control plane or as protocol-specific data
      plane content.

   Hardware (H):  This IE expresses characteristics about an attester's
      hardware components or the composition of its hardware components.
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