1、 ETSI TS 133 204 V15.0.0 (2018-07) Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; 3G Security; Network Domain Security (NDS); Transaction Capabilities Application Part (TCAP) user security (3GPP TS 33.204 version 15.0.0 Release 15
2、) TECHNICAL SPECIFICATION ETSI ETSI TS 133 204 V15.0.0 (2018-07)13GPP TS 33.204 version 15.0.0 Release 15Reference RTS/TSGS-0333204vf00 Keywords GSM,LTE,SECURITY,UMTS ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 56
3、2 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important notice The present document can be downloaded from: http:/www.etsi.org/standards-search The present document may be made available in electronic versions and/or in print. The content of a
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9、M logo are trademarks registered and owned by the GSM Association. ETSI ETSI TS 133 204 V15.0.0 (2018-07)23GPP TS 33.204 version 15.0.0 Release 15Intellectual Property Rights Essential patents IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The infor
10、mation pertaining to these essential IPRs, if any, is publicly available for ETSI members and 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
11、ETSI Secretariat. Latest updates are available on the ETSI Web server (https:/ipr.etsi.org/). 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
12、 updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Trademarks The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners. ETSI claims no ownership of these except for any which are indicated
13、 as being the property of ETSI, and conveys no right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks. Foreword This Technical Spe
14、cification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP). The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or GSM identities. These should be interpreted as being references to the corresponding ETSI deliver
15、ables. The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under http:/webapp.etsi.org/key/queryform.asp. Modal verbs terminology In the present document “shall“, “shall not“, “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “cannot“ are to be interpr
16、eted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TS 133 204 V15.0.0 (2018-07)33GPP TS 33.204 version 15.0.0 Release 15Contents Intellec
17、tual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 5g3Introduction 5g31 Scope 6g32 References 6g33 Definitions, symbols and abbreviations . 6g33.1 Definitions 6g33.2 Symbols 7g33.3 Abbreviations . 7g33.4 Conventions 7g34 Principles of TCAP user security . 8g34.1 Overview 8g3
18、4.2 Network architecture 8g34.2.1 General 8g34.2.2 End-to-end architecture . 8g34.2.3 Hub-and-Spoke architecture . 9g35 TCAP user security (TCAPsec) . 10g35.1 Security services provided by TCAPsec 10g35.2 Properties and tasks of an SS7-SEG . 10g35.3 Policy requirements for the TCAPsec Security Polic
19、y Database (SPD) 10g35.4 TCAPsec security association attribute definition 11g35.5 TCAPsec structure of protected messages 12g35.5.1 TCAPsec security header 13g35.5.2 Protected payload 13g35.5.2.1 Protection Mode 1 . 13g35.5.2.2 Protection Mode 2. 13g35.6 TCAPsec algorithms. 14g35.6.1 Mapping of TCA
20、Psec SA encryption algorithm identifiers 14g35.6.1.1 Description of SEA-0 14g35.6.2 Mapping of TCAPsec SA integrity algorithm identifiers . 14g35.6.2.1 Description of SIA-0 . 14g35.6.3 Construction of IV 14g3Annex A (informative): Guidelines for manual key management . 15g3A.1 Inter-domain Security
21、Association and Key Management Procedures 15g3A.2 Local Security Association Distribution 15g3Annex B (normative): TCAPsec message flows . 16g3Annex C (informative): High level migration strategy 18g3C.1 Transition phase from unprotected to protected message transfer . 18g3C.2 Transition phase from
22、protected message transfer to unprotected message transfer. . 19g3C.3 Transition phase from protected mode to another protected mode 19g3Annex D (normative): Using TCAP handshake for SMS transfer 20g3D.1 Mobile Terminated SMS 20g3D.2 Mobile Originated SMS . 21g3ETSI ETSI TS 133 204 V15.0.0 (2018-07)
23、43GPP TS 33.204 version 15.0.0 Release 15Annex E (informative): Change history . 23g3History 24g3ETSI ETSI TS 133 204 V15.0.0 (2018-07)53GPP TS 33.204 version 15.0.0 Release 15Foreword This Technical Specification has been produced by the 3rdGeneration Partnership Project (3GPP). The contents of the
24、 present document are subject to continuing work within the TSG and may change following formal TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an identifying change of release date and an increase in version number as follows: Version
25、 x.y.z where: x the first digit: 1 presented to TSG for information; 2 presented to TSG for approval; 3 or greater indicates TSG approved document under change control. y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections, updates, etc. z the third
26、 digit is incremented when editorial only changes have been incorporated in the document. Introduction The absence of security in Signalling System No. 7 (SS7) networks is an identified security weakness in 2G systems. This was formerly perceived not to be a problem, since the SS7 networks were the
27、provinces of a small number of large institutions. This is no longer the case, and so there is now a need for security precautions. For 3G systems it is a clear goal to be able to protect the core network signalling protocols, and by implication this means that security solutions shall be found for
28、both SS7 and IP based protocols. Various protocols and interfaces are used for control plane signalling within and between core networks. The security services that have been identified as necessary are confidentiality, integrity, authentication and anti-replay protection. These will be ensured by s
29、tandard procedures, based on cryptographic techniques. ETSI ETSI TS 133 204 V15.0.0 (2018-07)63GPP TS 33.204 version 15.0.0 Release 151 Scope This technical specification covers the security mechanisms and procedures necessary to protect all TCAP user messages which are sent between different securi
30、ty domains. The complete set of enhancements and extensions to facilitate security protection for the TCAP protocol is termed TCAPsec and it covers transport security in the TCAP protocol itself and the security management procedures. This technical specification contains the stage 2 specification f
31、or security protection of the TCAP protocol. The actual implementation (stage 3) specification can be found in TS 29.204 9. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document. References are either specific (id
32、entified by date of publication, edition number, version number, etc.) or non-specific. For a specific reference, subsequent revisions do not apply. For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific refe
33、rence implicitly refers to the latest version of that document in the same Release as the present document. 1 3GPP TR 21.905: “Vocabulary for 3GPP Specifications“. 2 3GPP TS 29.002: “Mobile Application Part (MAP) specification“. 3 NIST Special Publication 800-38A “Recommendation for Block Cipher Mod
34、es of Operation“ December 2001. 4 ISO/IEC 9797: “Information technology - Security techniques - Message Authentication Codes (MACs) - Part 1: Mechanisms using a block cipher“, Ed.1, 1999-12-16. 5 FIPS Publication 197: “Specification for the Advanced Encryption Standard (AES)“, November 26, 2001. 6 3
35、GPP TS 33.210: “3G security; Network Domain Security (NDS); IP network layer security“. 7 W3C DTF profile of ISO 8601: 2000 - Data Elements and Interchange Formats - Information Interchange - Representation of Dates and Times. International Organization for Standardization. http:/www.w3.org/TR/1998/
36、NOTE-datetime-19980827. 8 3GPP TS 23.003: “Numbering, addressing and identification“. 9 3GPP TS 29.204: “Signalling System No. 7 (SS7) security gateway; Architecture, functional description and protocol details “ 3 Definitions, symbols and abbreviations 3.1 Definitions In addition to the definitions
37、 included in TR 21.905 1, for the purposes of the present document, the following definitions apply: Anti-replay protection: Anti-replay protection is a special case of integrity protection. Its main service is to protect against replay of self-contained packets that already have a cryptographic int
38、egrity mechanism in place. Confidentiality: The property that information is not made available or disclosed to unauthorised individuals, entities or processes. ETSI ETSI TS 133 204 V15.0.0 (2018-07)73GPP TS 33.204 version 15.0.0 Release 15Data integrity: The property that data has not been altered
39、in an unauthorised manner. Data origin authentication: The corroboration that the source of data received is as claimed. Entity authentication: The provision of assurance of the claimed identity of an entity. Key freshness: A key is fresh if it can be guaranteed to be new, as opposed to an old key b
40、eing reused through actions of either an adversary or authorised party. Security Association: A logical connection created for security purposes. All traffic traversing a security association is provided the same security protection. The security association specifies protection levels, algorithms t
41、o be used, lifetimes of the connection etc. SS7 Carrier: An SS7 network that is not a PLMN. SS7 Security Gateway: A Network Node that terminates and initiates TCAPsec. Similar to a SEG (see TS 33.210 6), the SS7 security Gateway is used for communication between two SS7 security domains. TCAPsec: Th
42、e complete collection of protocols and procedures needed to protect TCAP user messages. 3.2 Symbols For the purposes of the present document, the following symbols apply: f6 TCAPsec encryption algorithm.f7 TCAPsec integrity algorithm. Zf TCAPsec reference point between SS7-SEGs engaged in security p
43、rotected signalling. 3.3 Abbreviations In addition to the abbreviations included in TR 21.905 1, for the purposes of the present document, the following abbreviations apply: AES Advanced Encryption Standard FALLBACK Fallback to unprotected mode indicator IP Internet Protocol IV Initialisation Vector
44、MAC Message Authentication Code MAC-M MAC used for TCAP user MAP Mobile Application Part NDS Network Domain Security NE Network Entity PROP Proprietary field SA Security Association SAD Security Association Database SEA SS7 security gateway Encryption Algorithm identifier SEK SS7 security gateway En
45、cryption Key SIA SS7 security gateway Integrity Algorithm identifier SIK SS7 security gateway Integrity Key SPD Security Policy Database SPI Security Parameters Index SS7-SEG SS7 security gateway TCAPsec TCAP user security the SS7 security gateway security protocol suite TCAP user Application Part i
46、dentified by the SCCP Subsystem Numbers of TS 23.003 8 TVP Time Variant Parameter 3.4 Conventions All data variables in this specification are presented with the most significant substring on the left hand side and the least significant substring on the right hand side. A substring may be a bit, byt
47、e or other arbitrary length bitstring. Where a variable is broken down into a number of substrings, the leftmost (most significant) substring is numbered 0, the next most significant is numbered 1, and so on through to the least significant. ETSI ETSI TS 133 204 V15.0.0 (2018-07)83GPP TS 33.204 vers
48、ion 15.0.0 Release 154 Principles of TCAP user security 4.1 Overview This technical specification defines mechanisms for protecting all TCAP user messages called TCAPsec. Another approach which could partially achieve the same goal as TCAPsec is the use of NDS/IP 6 at the network layer when IP is us
49、ed as the transport protocol. However, whenever inter-working with networks using SS7-based transport is necessary, protection with TCAPsec shall be used. The benefit for an operator applying TCAPsec will gradually increase when more interconnected operators also apply TCAPsec. TCAPsec can be used together with TCAP handshake solutions, however when using TCAPsec for MAP SMS transfers between two PLMNs, running TCAP handshake in addition does not add more security. NOTE 1: A limited level of MAP message authenticity can be achieved w
