ISO/TS 21177:2019
(Main)Intelligent transport systems — ITS station security services for secure session establishment and authentication between trusted devices
Intelligent transport systems — ITS station security services for secure session establishment and authentication between trusted devices
This document contains specifications for a set of ITS station security services required to ensure the authenticity of the source and integrity of information exchanged between trusted entities: — devices operated as bounded secured managed entities, i.e. "ITS Station Communication Units" (ITS-SCU) and "ITS station units" (ITS-SU) specified in ISO 21217, and — between ITS-SUs (composed of one or several ITS-SCUs) and external trusted entities such as sensor and control networks. These services include authentication and secure session establishment which are required to exchange information in a trusted and secure manner. These services are essential for many ITS applications and services including time-critical safety applications, automated driving, remote management of ITS stations (ISO 24102-2[5]), and roadside/infrastructure related services.
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TECHNICAL ISO/TS
SPECIFICATION 21177
First edition
2019-08
Intelligent transport systems —
ITS station security services for
secure session establishment and
authentication between trusted devices
Reference number
ISO/TS 21177:2019(E)
©
ISO 2019
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ISO/TS 21177:2019(E)
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ISO/TS 21177:2019(E)
Contents Page
Foreword .vi
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 2
5 Overview . 3
5.1 Goals . 3
5.2 Architecture and functional entities . 4
5.3 Cryptomaterial handles . 7
5.4 Session IDs and state . 7
5.5 Access control and authorisation state . 8
5.6 Application level non-repudiation . 8
5.7 Service primitive conventions . 8
6 Process flows and sequence diagrams . 9
6.1 General . 9
6.2 Overview of process flows . 9
6.3 Sequence diagram conventions .10
6.4 Configure .11
6.5 Start Session .12
6.6 Send data .14
6.7 Send access control PDU .17
6.8 Receive PDU .18
6.9 Secure connection brokering .23
6.9.1 Goals .23
6.9.2 Prerequisites .24
6.9.3 Overview .24
6.9.4 Detailed specification .25
6.10 Force end session .33
6.11 Session terminated at session layer .35
6.12 Deactivate .35
6.13 Secure session example .36
7 Security Subsystem: interfaces and data types .38
7.1 General .38
7.2 Access control policy and state .39
7.3 Enhanced authentication .40
7.3.1 Definition and possible states .40
7.3.2 States for owner role enhanced authentication .40
7.3.3 State for accessor role enhanced authentication .41
7.3.4 Use by Access Control .42
7.3.5 Methods for providing enhanced authentication .42
7.3.6 Enhanced authentication using SPAKE2 .42
7.4 Extended authentication .43
7.5 Data types .44
7.5.1 General.44
7.5.2 Imports .44
7.5.3 Iso21177AccessControlPdu .44
7.5.4 AccessControlResult .44
7.5.5 ExtendedAuthPdu .44
7.5.6 ExtendedAuthRequest .45
7.5.7 InnerExtendedAuthRequest .45
7.5.8 AtomicExtendedAuthRequest .46
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ISO/TS 21177:2019(E)
7.5.9 ExtendedAuthResponse .46
7.5.10 ExtendedAuthResponsePayload .46
7.5.11 EnhancedAuthPdu .47
7.5.12 SpakeRequest.47
7.5.13 SpakeResponse .47
7.5.14 SpakeRequesterResponse .48
7.6 App-Sec Interface .48
7.6.1 App-Sec-Configure.request .48
7.6.2 App-Sec-Configure.confirm.49
7.6.3 App-Sec-StartSession.indication .49
7.6.4 App-Sec-Data.request .50
7.6.5 App-Sec-Data.confirm . .50
7.6.6 App-Sec-Incoming.request .51
7.6.7 App-Sec-Incoming.confirm .51
7.6.8 App-Sec-EndSession.request .52
7.6.9 App-Sec-EndSession.confirm .52
7.6.10 App-Sec-EndSession.indication.52
7.6.11 App-Sec-Deactivate.request .53
7.6.12 App-Sec-Deactivate.confirm .53
7.6.13 App-Sec-Deactivate.indication .53
7.7 Security Subsystem internal interface .54
7.7.1 General.54
7.7.2 Sec-AuthState.request .54
7.7.3 Sec-AuthState.confirm . .55
8 Adaptor Layer: Interfaces and data types .55
8.1 General .55
8.2 Data types .56
8.2.1 General.56
8.2.2 Iso21177AdaptorLayerPDU .56
8.2.3 Apdu . .57
8.2.4 Access Control .57
8.2.5 TlsClientMsg1 .57
8.2.6 TlsServerMsg1 .57
8.3 App-AL Interface .57
8.3.1 App-AL-Data.request .57
8.3.2 App-AL-Data.confirm .58
8.3.3 App-AL-Data.indication .58
8.3.4 App-AL-EnableProxy.request .59
8.4 Sec-AL Interface .61
8.4.1 Sec-AL-AccessControl.request.61
8.4.2 Sec-AL-AccessControl.confirm .61
8.4.3 Sec-AL-AccessControl.indication .61
8.4.4 Sec-AL-EndSession.request .62
8.4.5 Sec-AL-EndSession.confirm.62
9 Secure Session services .62
9.1 General .62
9.2 App-Sess interfaces .62
9.2.1 App-Sess-EnableProxy.request .62
9.3 Sec-Sess interface .63
9.3.1 Sec-Sess-Configure.request .63
9.3.2 Sec-Sess-Configure.confirm .65
9.3.3 Sec-Sess-Start.indication .65
9.3.4 Sec-Sess-EndSession.indication .66
9.3.5 Sec-Sess-Deactivate.request .66
9.3.6 Sec-Sess-Deactivate.confirm .67
9.4 AL-Sess interface .67
9.4.1 AL-Sess-Data.request .67
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ISO/TS 21177:2019(E)
9.4.2 AL-Sess-Data.confirm.67
9.4.3 AL-Sess-Data.indication .68
9.4.4 AL-Sess-EndSession.request .68
9.4.5 AL-Sess-EndSession.confirm .68
9.4.6 AL-Sess-ClientHelloProxy.request .69
9.4.7 AL-Sess-ClientHelloProxy.indication .69
9.4.8 AL-Sess-ServerHelloProxy.request .70
9.4.9 AL-Sess-ServerHelloProxy.indication .70
9.4.10 AL-Sess-EndSession.request .71
9.4.11 AL-Sess-EndSession.confirm .72
9.5 Permitted mechanisms .72
9.5.1 TLS 1.3 .72
9.5.2 DTLS 1.3.73
Annex A (informative) Usage scenarios .74
Annex B (normative) ASN.1 module .81
Bibliography .82
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ISO/TS 21177:2019(E)
Foreword
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ISO/TS 21177:2019(E)
Introduction
This document is about ITS station security services required to ensure the authenticity of the source
and confidentiality and integrity of application activities taking place between trusted devices.
The trust relation between two devices is illustrated in Figure 1. Two devices cooperate in a trusted
way, i.e. exchange information with optional explicit bi-directional protection.
Figure 1 — Interconnection of trusted devices
According to ISO 21217, an ITS station unit (ITS-SU), i.e. the physical implementation of the ITS station
(ITS-S) functionality, is a trusted device, and an ITS-SU may be composed of ITS station communication
units (ITS-SCU) that are interconnected via an ITS station-internal network. Thus an ITS-SCU is the
smallest physical entity of an ITS-SU that is referred to as a trusted device.
[15]
NOTE 1 ISO 21217 fully covers the functionality of EN 302 665 , which is a predecessor of ISO 21217.
NOTE 2 An ITS-SU can be composed of ITS-SCUs from different vendors where each ITS-SCU is linked to a
[5]
different ITS-SCU configuration and management centre specified in ISO 24102-2 and ISO 17419. Station-
[7]
internal management communications between ITS-SCUs of the same ITS-SU is specified in ISO 24102-4 .
European C-ITS regulation refers to the "ITS-SCU configuration and management centre" as "C-ITS station
operator" meaning the entity responsible for the operation of a C-ITS station. The C-ITS station operator can be
responsible for the operation of one single C-ITS station (fixed or mobile), or a C-ITS infrastructure composed of a
number of fixed C-ITS stations, or a number of mobile ITS-Stations.
Four implementation contexts of communication nodes in ITS communications networks are identified
in the ITS station and communication architecture ISO 21217, each comprised of ITS-station units (ITS-
SU) taking on a particular role; personal, vehicular, roadside, or central. These ITS-SUs are ITS-secured
communication nodes as required in ISO 21217 that participate in a wide variety of ITS services related
to, e.g. sustainability, road safety and transportation efficiency.
Over the last decade, ITS services have arisen that require secure access to data from Sensor and Control
Networks (SCN), e.g. from In-Vehicle Networks (IVN) and from Infrastructure/Roadside Networks
(IRN), some of which require secure local access to time-critical information; see Figures 2 and 3.
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ISO/TS 21177:2019(E)
Figure 2 — Example of a roadside ITS-SU connected with proprietary IRN
Figure 3 — Example of a vehicle ITS-SU connected with proprietary IRN
Trust in the ITS domain primarily is between ITS Station Communication Units (ITS-SCUs) introduced
in ISO 21217; see Figure 4.
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ISO/TS 21177:2019(E)
Figure 4 — Interconnection of ITS-SCUs in an ITS-SU
ITS-SCUs are interconnected via an ITS station-internal network. Applying basic security means
specified in this document, the ITS-SCUs trust each other. Additionally, protocol data units exchanged
between ITS-SCUs may be further protected by additional means, e.g. applying encryption. Major
application domains of secure communications between ITS-SCUs of the same ITS-SU are local station
[4]
management specified in ISO 24102-1 using station-internal management communications specified
[7]
in ISO 24102-4 .
Trust in the ITS domain further is between ITS-SUs introduced in ISO 21217
...
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