1、 ETSI TS 102 942 V1.1.1 (2012-06) Intelligent Transport Systems (ITS); Security; Access Control Technical Specification ETSI ETSI TS 102 942 V1.1.1 (2012-06)2Reference DTS/ITS-0050016 Keywords ITS, security, service ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 9
2、4 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important notice Individual copies of the present document can be downloaded from: http:/www.etsi.org The present document may be made available in
3、more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF). In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept on a specific
4、 network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI documents is available at http:/portal.etsi.org/tb/status/status.asp If you find errors in
5、the present document, please send your comment to one of the following services: http:/portal.etsi.org/chaircor/ETSI_support.asp Copyright Notification No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all medi
6、a. European Telecommunications Standards Institute 2012. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM and LTE are Trade Marks of ETSI registered for the benefit of its Members and of the 3GPP Organizationa
7、l Partners. GSM and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI TS 102 942 V1.1.1 (2012-06)3Contents Intellectual Property Rights 4g3Foreword . 4g31 Scope 5g32 References 5g32.1 Normative references . 5g32.2 Informative references 5g33 Definitions and abbrevia
8、tions . 5g33.1 Definitions 5g33.2 Abbreviations . 6g34 Access Control in ITS 6g34.1 Authentication and Authorization requirements . 6g34.2 Establishing preconditions within the ITS-S 7g35 Authentication and Authorization Services 7g35.1 Services for CAM . 7g35.2 Services for DENM 7g3Annex A (informa
9、tive): Bibliography . 9g3History 10g3ETSI ETSI TS 102 942 V1.1.1 (2012-06)4Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members a
10、nd non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http:/ipr.etsi.org).
11、 Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the presen
12、t document. Foreword This Technical Specification (TS) has been produced by ETSI Technical Committee Intelligent Transport System (ITS). ETSI ETSI TS 102 942 V1.1.1 (2012-06)51 Scope The present document specifies authentication and authorization services to avoid unauthorized access to ITS services
13、. It also specifies measures to ensure the required level of security and privacy for ITS message communication. 2 References References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version ap
14、plies. For non-specific references, the latest version of the referenced document (including any amendments) applies. Referenced documents which are not found to be publicly available in the expected location might be found at http:/docbox.etsi.org/Reference. NOTE: While any hyperlinks included in t
15、his clause were valid at the time of publication ETSI cannot guarantee their long term validity. 2.1 Normative references The following referenced documents are necessary for the application of the present document. 1 ETSI TS 102 940: “Intelligent Transport Systems (ITS); Security; ITS communication
16、s security architecture and security management“. 2 ETSI TS 102 941: “Intelligent Transport Systems (ITS); Security; Trust and Privacy Management“. 3 ETSI TS 102 860: “Intelligent Transport Systems (ITS); Classification and management of ITS application objects“. 4 IEEE Std. 1609.2 draft D12 (Januar
17、y 2012): “Wireless Access in Vehicular Environments - Security Services for Applications and Management Messages“. 2.2 Informative references The following referenced documents are not necessary for the application of the present document but they assist the user with regard to a particular subject
18、area. Not applicable. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: destination port: logical port number identifying the processing element to which a message received over the ETSI ITS Basic Transport Protocol s
19、hould be directed within an ITS-S ITS application object: generic term for either ITS application class, ITS application or ITS message set ETSI ETSI TS 102 942 V1.1.1 (2012-06)63.2 Abbreviations For the purposes of the present document, the following abbreviations apply: CAM Cooperative Awareness M
20、essage DENM Decentralized Environmental Notification Message ITS Intelligent Transport System ITS-S ITS Station PSID Provider Service Identifier RSU Road Side Unit 4 Access Control in ITS 4.1 Authentication and Authorization requirements TS 102 940 1 identifies ITS application groups and their autho
21、rization requirements, as summarized below: Cooperative awareness: - Basic CAM authorization: square4 linked to basic data such as length, width, speed, heading, acceleration and brake status; square4 granted to all enrolled ITS stations to enable participation in the basic ITS. - Advanced CAM autho
22、rization: square4 contains additional information such as that required for across traffic turning, merging assistance and collision warning; square4 depends on the abilities of the sending station such as the cryptographic algorithms implemented, its sensors and its perceived trustworthiness. - Aut
23、horization to claim priority rights for emergency vehicles: square4 granted only to specially authorized emergency vehicles or public transport vehicles according to national legislation. Multiple layers of priority may be defined, for example priority for emergency vehicles and on a lower level aut
24、horization to use a special lane reserved for public transportation; square4 granted by a governmental organization or its authorized proxy agency; square4 priority rights asserted by the user during operation, not during authorization. - Authorization to state regulatory orders such as speed limits
25、 and road closures: square4 granted only to specially authorized ITS stations such as RSUs and police vehicles; square4 granted by a governmental organization or its authorized proxy agency. Static local hazard warning: - Authentication and Authorization requirements are similar to CAM with the addi
26、tion that authorization should be limited to the specific purpose, functionality, and location of the respective RSU. Dynamic local hazard warning: - Authorization and Authentication requirements are similar to CAM with the addition that for the subsequent unicast session the local policies of the p
27、articipating partners may require additional authorization and/or authentication. These additional requirements are out of scope of the present document. ETSI ETSI TS 102 942 V1.1.1 (2012-06)7 Area hazard warning: - Authorization for area hazard warnings (Decentralized Environment Notification Messa
28、ges, DENM) could be granted on several levels depending on sensor equipment, sensor quality and algorithmic and processing capabilities of the ITS-S. Apart from that, similar requirements as for CAM apply. Advertised services, local high-speed unicast service, local multicast service, low-speed unic
29、ast service, distributed service: - Authentication and authorization services are service-specific. Considerations for multiple applications: - In general, Authentication and Authorization are handled separately for each individual application. The specific requirements need to be dealt with in poli
30、cies associated with the authorization or during the authorization process itself. 4.2 Establishing preconditions within the ITS-S Clause 5 in TS 102 941 2 specifies the processes to be followed by an ITS-S in acquiring the necessary enrolment and authorization certificates. Clause 5.1 of TS 102 941
31、 2 defines the preconditions necessary within the ITS-S prior to enrolment. The same preconditions apply for authentication and authorization services. 5 Authentication and Authorization Services 5.1 Services for CAM A message shall be identified as a CAM using the destination port number which shal
32、l be a two-byte port number preceded by the hexadecimal value DF encoded in an ITS-AID 3 as shown in figure 1. The ITS-AID itself shall be encoded using the PSID defined in IEEE 1609.2 4. Byte n Byte n+1 Byte n+2 D F Port Number Figure 1: ITS port number carried in an ITS-AID Authentication and auth
33、orization information (permissions) for CAMs are encoded in authorization certificates as defined in TS 102 941 2. CAMs shall include both of the following: the destination port number: - ensures that the message is routed to the appropriate processing element in the receiving ITS-S; and the associa
34、ted authorization certificate or an unambiguous reference to it: - demonstrates to the receiving ITS-S that the sending ITS-S is authorized to invoke the sending of the received message type. 5.2 Services for DENM A message shall be identified as a DENM using a port number encoded as shown in figure
35、 1. The ITS-AID itself shall be encoded using the PSID defined in IEEE 1609.2 4. ETSI ETSI TS 102 942 V1.1.1 (2012-06)8Authentication and authorization information (permissions) for DENMs are encoded in authorization certificates as defined in TS 102 941 2. DENMs shall include: the destination port
36、number: - ensures that the message is routed to the appropriate processing element in the receiving ITS-S; and the associated authorization certificate or an unambiguous reference to it: - demonstrates to the receiving ITS-S that the sending ITS-S is authorized to invoke the sending of the received
37、message type. ETSI ETSI TS 102 942 V1.1.1 (2012-06)9Annex A (informative): Bibliography ETSI TS 102 943: “Intelligent Transport Systems (ITS); Security; Confidentiality services“. ISO 24102: “Intelligent transport systems - Communications access for land mobiles (CALM) - Management“. ETSI ETSI TS 102 942 V1.1.1 (2012-06)10History Document history V1.1.1 June 2012 Publication
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