Restful Attested Resources
draft-shaw-rats-rear-00

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RATS                                                             A. Shaw
Internet-Draft                                             H. Tschofenig
Intended status: Informational                               S. Trofimov
Expires: 14 December 2020                                       S. Frost
                                                              T. Fossati
                                                                     arm
                                                            12 June 2020

                       Restful Attested Resources
                        draft-shaw-rats-rear-00

Abstract

   This memo describes a REST interface based on the RATS architecture
   that can be used to retrieve attested system state, for example the
   reading of a security critical sensor.  The objective is to present a
   common vocabulary of data formats and basic protocol transactions
   that can be pieced together into a cohesive interface that is capable
   of serving different attestation workflows.

Status of This Memo

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   This Internet-Draft will expire on 14 December 2020.

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
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   Please review these documents carefully, as they describe your rights
   and restrictions with respect to this document.  Code Components

Shaw, et al.            Expires 14 December 2020                [Page 1]
Internet-Draft                    REAR                         June 2020

   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  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Use Cases . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Document Organisation . . . . . . . . . . . . . . . . . .   4
     1.3.  Conventions used in this document . . . . . . . . . . . .   4
   2.  Abstract Mechanism  . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  Attester Interface  . . . . . . . . . . . . . . . . . . .   4
       2.1.1.  Resource Validation . . . . . . . . . . . . . . . . .   5
     2.2.  Verifier Interface  . . . . . . . . . . . . . . . . . . .   5
       2.2.1.  Attestation Result Validation . . . . . . . . . . . .   6
     2.3.  Example Compositions  . . . . . . . . . . . . . . . . . .   6
       2.3.1.  Background Check with Nonce-based Freshness . . . . .   6
       2.3.2.  Background Check with Timestamp-based Freshness . . .   7
       2.3.3.  Passport with Timestamp-based Freshness . . . . . . .   7
       2.3.4.  Timestamp-based Uni-directional . . . . . . . . . . .   8
   3.  REST Instantiation  . . . . . . . . . . . . . . . . . . . . .   9
     3.1.  Basic Data Formats  . . . . . . . . . . . . . . . . . . .   9
       3.1.1.  Resource  . . . . . . . . . . . . . . . . . . . . . .   9
       3.1.2.  Nonce . . . . . . . . . . . . . . . . . . . . . . . .  10
       3.1.3.  Timestamp . . . . . . . . . . . . . . . . . . . . . .  10
       3.1.4.  Evidence  . . . . . . . . . . . . . . . . . . . . . .  10
       3.1.5.  Attestation Result  . . . . . . . . . . . . . . . . .  10
     3.2.  Request and Response Payloads . . . . . . . . . . . . . .  10
       3.2.1.  Requesting an Attested Resource . . . . . . . . . . .  10
       3.2.2.  Attested Resource . . . . . . . . . . . . . . . . . .  10
       3.2.3.  Request for Attestation Result  . . . . . . . . . . .  11
       3.2.4.  Verifier Response . . . . . . . . . . . . . . . . . .  11
     3.3.  Interaction Model . . . . . . . . . . . . . . . . . . . .  12
       3.3.1.  Channel Security Considerations . . . . . . . . . . .  12
       3.3.2.  URLs  . . . . . . . . . . . . . . . . . . . . . . . .  12
       3.3.3.  Methods . . . . . . . . . . . . . . . . . . . . . . .  12
       3.3.4.  Multicast Support . . . . . . . . . . . . . . . . . .  13
       3.3.5.  Examples  . . . . . . . . . . . . . . . . . . . . . .  13
   4.  Discovery . . . . . . . . . . . . . . . . . . . . . . . . . .  17
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