ETSI TS 102 232-3 V3.7.1 (2017-11)

Lawful Interception (LI); Handover Interface and Service-Specific Details (SSD) for IP delivery; Part 3: Service-specific details for internet access services

RTS/LI-00150-3

General Information

• Status: Published
• Publication Date: 22-Nov-2017
• Technical Committee: LI - Lawful Interception
• Current Stage: 12 - Completion
• Due Date: 24-Nov-2017
• Completion Date: 23-Nov-2017

Standards Content (Sample)

ETSI TS 102 232-3 V3.7.1 (2017-11)






TECHNICAL SPECIFICATION
Lawful Interception (LI);
Handover Interface and
Service-Specific Details (SSD) for IP delivery;
Part 3: Service-specific details for internet access services

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2 ETSI TS 102 232-3 V3.7.1 (2017-11)



Reference
RTS/LI-00150-3
Keywords
access, internet, IP, lawful interception, security,
service
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3 ETSI TS 102 232-3 V3.7.1 (2017-11)
Contents
Intellectual Property Rights . 6
Foreword . 6
Modal verbs terminology . 6
Introduction . 6
1 Scope . 7
2 References . 7
2.1 Normative references . 7
2.2 Informative references . 8
3 Definitions and abbreviations . 8
3.1 Definitions . 8
3.2 Abbreviations . 9
4 General . 10
4.1 Internet Access Service (IAS) . 10
4.2 Target identity and IP address . 10
4.3 Lawful Interception requirements . 11
4.3.0 Introduction. 11
4.3.1 Target identity . 11
4.3.2 Result of interception . 11
4.3.3 Intercept related information messages. 12
4.3.4 Time constraints . 13
4.3.5 Preventing over and under collection of intercept data . 13
5 System model . 13
5.1 Reference network topologies . 13
5.1.0 Introduction. 13
5.1.1 Dial-up access . 14
5.1.2 xDSL access. 15
5.1.3 Cable modem access . 16
5.1.4 IEEE 802.11 Access (with Wireless LAN profile) . 16
5.2 Reference scenarios . 17
5.2.1 Logon . 17
5.2.2 Multi logon . 17
5.2.3 Multilink logon . 17
5.2.4 IP transport. 17
5.2.5 Logoff . 18
5.2.6 Connection loss . 18
6 Intercept Related Information (IRI) . 19
6.1 IRI events . 19
6.2 HI2 attributes . 20
6.2.0 List of HI2 attributes . 20
6.2.1 Use of targetIPAddress, additionalIPAddress and otherTargetIdentifiers fields . 21
6.2.2 Use of location field . 22
7 Content of Communication (CC) . 22
7.1 CC events . 22
7.2 HI3 attributes . 22
8 ASN.1 for IRI and CC . 22
Annex A (informative): Stage 1 - RADIUS characteristics . 28
A.1 Network topology . 28
A.1.0 RADIUS deployment options. 28
A.1.1 RADIUS server . 28
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4 ETSI TS 102 232-3 V3.7.1 (2017-11)
A.1.2 RADIUS proxy . 29
A.2 RADIUS service . 30
A.2.1 Authentication service . 30
A.2.2 Accounting service . 30
A.2.3 IPv6 . 31
A.3 RADIUS protocol . 31
A.3.1 Authentication protocol . 31
A.3.2 Accounting protocol . 32
A.4 RADIUS main attributes . 32
A.5 RADIUS interception . 33
A.5.0 Introduction . 33
A.5.1 Collecting RADIUS packets. 33
A.5.2 Processing RADIUS packets . 33
A.5.2.1 Mapping events to RADIUS packets . 33
A.5.2.2 Functional model . 34
A.5.2.3 RADIUS spoofing . 38
A.5.2.4 Mapping of Acct-Terminate-Cause to endReason . 38
A.5.2.5 Use of Event-Time . 39
A.5.2.6 Use of targetIPAddress, additionalIPAddress and otherTargetIdentifiers fields . 39
A.5.3 Mapping RADIUS on the IRI structure . 39
Annex B (informative): Stage 1 - DHCP characteristics . 43
B.1 Network topology . 43
B.2 DHCP service . 43
B.3 BOOTP protocol . 44
B.4 DHCP protocol . 44
B.4.0 Overview . 44
B.4.1 Address assignment . 46
B.4.2 Message transmission and relay agents . 46
B.4.3 Security and authentication . 46
B.5 DHCP main attributes . 46
B.6 DHCP interception . 47
B.6.1 Introduction . 47
B.6.2 DHCP packets . 48
B.6.3 State machine . 48
B.6.3.0 Overview . 48
B.6.3.1 Mapping DHCP packets to events . 49
B.6.3.2 Timers and administrative events . 49
B.6.3.3 State information . 49
B.6.3.4 State machine diagram . 50
B.6.4 Mapping DHCP on the IRI structure . 50
Annex C (informative): IP IRI interception . 52
C.1 Introduction . 52
C.2 Requirements . 52
C.3 Proposed implementation . 52
Annex D (informative): TCP and UDP IRI interception . 53
D.1 Introduction . 53
D.2 Requirements . 53
D.3 HI2 requirements . 53
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5 ETSI TS 102 232-3 V3.7.1 (2017-11)
D.4 HI3 requirements . 54
D.5 General requirements . 54
Annex E (informative): Bibliography . 55
Annex F (informative): Change Request history . 56
History . 59

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6 ETSI TS 102 232-3 V3.7.1 (2017-11)
Intellectual Property Rights
Essential patents
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 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 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 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 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 Specification (TS) has been produced by ETSI Technical Committee Lawful Interception (LI).
The present document is part 3 of a multi-part deliverable. Full details of the entire series can be found in part 1 [2].
The ASN.1 module is also available as an electronic attachment to the original document from the ETSI site (see
clause 8 for more details).
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 interpreted 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.
Introduction
The intention of the present document has been to follow the advice given at ETSI meetings in all cases.
The present document focuses on intercepting IP data in relation to the use of Internet Access Services (IAS) and is to
be used in conjunction with ETSI TS 102 232-1 [2]. In the latter document the handing over of the intercepted data is
described.
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7 ETSI TS 102 232-3 V3.7.1 (2017-11)
1 Scope
The present document contains a stage 1 description of the interception information in relation to the process of binding
a "target identity" to an IP address when providing Internet access and a stage 2 description of when Intercept Related
Information (IRI) and Content of Communication (CC) need to be sent, and what information it needs to contain.
The study includes but is not restricted to IRI based on application of Dynamic Host Configuration Protocol (DHCP)
and Remote Authentication Dial-in User Service (RADIUS) technology for binding a "target identity" to an IP address
and CC for the intercepted IP packets.
The definition of the Handover Interface 2 (HI2) and Handover Interface 3 (HI3) is outside the scope of the present
document. For the handover interface is referred to ETSI TS 102 232-1 [2].
2 References
2.1 Normative 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 applies. 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
https://docbox.etsi.org/Reference.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are necessary for the application of the present document.
[1] ETSI TS 101 671: "Lawful Interception (LI); Handover interface for the lawful interception of
telecommunications traffic".
NOTE: Periodically ETSI TS 101 671 is published as ETSI ES 201 671. A reference to the latest version of the
TS as above reflects the latest stable content from ETSI/TC LI.
[2] ETSI TS 102 232-1: "Lawful Interception (LI); Handover Interface and Service-Specific Details
(SSD) for IP delivery; Part 1: Handover specification for IP delivery".
[3] IETF RFC 1122: "Requirements for Internet Hosts - Communication Layers".
[4] IETF RFC 1570: "PPP LCP Extensions".
[5] IETF RFC 1990: "The PPP Multilink Protocol (MP)".
[6] IETF RFC 2131: "Dynamic Host Configuration Protocol".
[7] IETF RFC 7542: "The Network Access Identifier".
[8] IETF RFC 2865: "Remote Authentication Dial In User Service (RADIUS)".
[9] IETF RFC 2866: "RADIUS Accounting".
[10] IETF RFC 3046: "DHCP Relay Agent Information Option".
[11] IETF RFC 3118: "Authentication for DHCP Messages".
[12] IETF RFC 3396: "Encoding Long Options in the Dynamic Host Configuration Protocol
(DHCPv4)".
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8 ETSI TS 102 232-3 V3.7.1 (2017-11)
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[13] IEEE 802.11 (ISO/IEC 8802-11): "IEEE Standard for Information technology -
Telecommunications and information exchange between systems - Local and metropolitan area
networks - Specific requirements - Part 11: Wireless LAN Medium Access Control (MAC) and
Physical Layer (PHY) Specifications".
[14] Recommendation ITU-T X.680: "Information technology - Abstract Syntax Notation One
(ASN.1): Specification of basic notation".
[15] IETF RFC 2132: "DHCP Options and BOOTP Vendor Extensions".
[16] ISO 3166-1: "Codes for the representation of names of countries and their subdivisions --
Part 1: Country codes".
[17] IETF RFC 2869: "RADIUS Extensions".
[18] IETF RFC 3162: "RADIUS and IPv6".
[19] IETF RFC 4818: "RADIUS Delegated-IPv6-Prefix Attribute".
[20] IETF RFC 6911: "RADIUS Attributes for IPv6 Access Networks".
2.2 Informative 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 applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
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 area.
[i.1] ETSI TR 102 205: "Methods for Testing and Specification (MTS); UML 2.0 action syntax
feasibility study".
[i.2] IEEE 802.1X-2001TM: "IEEE Standards for Local and Metropolitan Area Networks: Port-Based
Network Access Control".
[i.3] draft-ietf-dhc-agentopt-radius-04.txt: "RADIUS Attributes Sub-option for the DHCP Relay Agent
Information Option".
[i.4] IANA bootp parameters.
NOTE: Available at http://www.iana.org/assignments/bootp-dhcp-parameters.
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the terms and definitions given in ETSI TS 102 232-1 [2] and the following
apply:
access provider: Communications Service Provider (CSP), providing access to a network
NOTE: In the context of the present document, the network access is defined as IP based network access to the
Internet.
access service: set of access methods provided to a user to access a service and/or a supplementary service
NOTE: In the context of the present document, the service to be accessed is defined as the Internet.
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9 ETSI TS 102 232-3 V3.7.1 (2017-11)
accounting: act of collecting information on resource usage for the purpose of trend analysis, auditing, billing, or cost
allocation
authentication: property by which the correct identity of an entity or party is established with a required assurance
authorization: property by which the access rights to resources are established and enforced
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
AAA Authentication, Authorization and Accounting
ACK Acknowledge
ADSL Asymmetric Digital Subscriber Line
ANP Access Network Provider
AP Access Provider
ARP Address Resolution Protocol
ASN.1 Abstract Syntax Notation One
ATM Asynchronous Transfer Mode
BOOTP BOOTstrap Protocol
CC Content of Communication
CHAP Challenge Handshake Authentication Protocol
CIN Communication Identity Number
CMTS Cable Modem Termination System
CPE Customer Premises Equipment
CSP Communications Service Provider (covers all AP/NWO/SvP)
DHCP Dynamic Host Configuration Protocol
DNS Domain Name System
DoS Denial of Service
DSL Digital Subscriber Line
DSLAM Digital Subscriber Line Access Multiplexer
FQDN Fully Qualified Domain Name
GWR GateWay Router
HI1 Handover Interface 1 (for Administrative Information)
HI2 Handover Interface 2 (for Intercept Related Information)
HI3 Handover Interface 3 (for Content of Communication)
IANA Internet Assigned Numbers Authority
IAP Internet Access Provider
IAS Internet Access Service
IETF International Engineering Task Force
IF Interception Function
IIF Internal Interception Function
IP Internet Protocol
IPCC Internet Protocol Call Content
IPFIX Internet Protocol Flow Information eXport
IPSEC Internet Protocol Security
IRI Intercept Related Information
ISDN Integrated Services Digital Network
ISP Internet Service Provider
LAN Local Area Network
LCP Link Control Protocol
LEA Law Enforcement Agency
LEMF Law Enforcement Monitoring Facility
LI Lawful Interception
MAC Media Access Control
MF Mediation Function
NA Not Applicable
NAS Network Access Server
NIC Network Interface Controller
NWO NetWork Operator
OID Object IDentifier
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10 ETSI TS 102 232-3 V3.7.1 (2017-11)
OSI Open Systems Interconnection
PAP Password Authentication Protocol
PC Personal Computer
PDA Personal Digital Assistant
PDU Packet Data Unit
POP Point of Presence
PPP Point-to-Point Protocol
PPPoA Point-to-Point Protocol over ATM
PPPoE Point-to-Point Protocol over Ethernet
PSTN Public Switched Telephone Network
QoS Quality of Service
RADIUS Remote Authentication Dial-In User Service
SLIP Serial Line Interface Protocol
SvP Service Provider
TCP Transmission Control Protocol
TCP/IP Transmission Control Protocol/Internet Protocol
TLV Type-Length Val
...