Lawful Interception (LI); Handover Interface and Service-Specific Details (SSD) for IP delivery; Part 2: Service-specific details for messaging services

RTS/LI-00190-2

General Information

Status
Published
Publication Date
27-Aug-2020
Technical Committee
Current Stage
12 - Completion
Due Date
07-Aug-2020
Completion Date
31-Aug-2020
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ETSI TS 102 232-2 V3.12.1 (2020-08) - Lawful Interception (LI); Handover Interface and Service-Specific Details (SSD) for IP delivery; Part 2: Service-specific details for messaging services
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ETSI TS 102 232-2 V3.12.1 (2020-08)
TECHNICAL SPECIFICATION
Lawful Interception (LI);
Handover Interface and
Service-Specific Details (SSD) for IP delivery;
Part 2: Service-specific details for messaging services
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2 ETSI TS 102 232-2 V3.12.1 (2020-08)
Reference
RTS/LI-00190-2
Keywords
email, handover, interface, IP, lawful interception,
security, traffic
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3 ETSI TS 102 232-2 V3.12.1 (2020-08)
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 ........................................................................................................................................ 9

3 Definition of terms, symbols and abbreviations ....................................................................................... 9

3.1 Terms .................................................................................................................................................................. 9

3.2 Symbols ............................................................................................................................................................ 10

3.3 Abbreviations ................................................................................................................................................... 10

4 General ................................................................................................................................................... 11

4.1 E-mail services ................................................................................................................................................. 11

4.2 Unified messaging ............................................................................................................................................ 11

5 E-mail system model .............................................................................................................................. 11

5.1 Reference network topology............................................................................................................................. 11

5.2 Reference scenarios .......................................................................................................................................... 12

5.2.1 E-mail send failure ...................................................................................................................................... 12

5.2.2 E-mail send success .................................................................................................................................... 13

5.2.3 E-mail download detail ............................................................................................................................... 14

5.2.4 E-mail send detail ....................................................................................................................................... 15

6 E-mail events .......................................................................................................................................... 16

6.1 Introduction ...................................................................................................................................................... 16

6.2 E-mail send event ............................................................................................................................................. 16

6.2.1 Introduction................................................................................................................................................. 16

6.2.2 E-mail send captured content ...................................................................................................................... 17

6.2.3 E-mail send IRI ........................................................................................................................................... 17

6.3 E-mail receive event ......................................................................................................................................... 17

6.3.1 Introduction................................................................................................................................................. 17

6.3.2 E-mail receive captured content .................................................................................................................. 18

6.3.3 E-mail receive IRI ....................................................................................................................................... 18

6.4 E-mail download event ..................................................................................................................................... 18

6.4.1 Introduction................................................................................................................................................. 18

6.4.2 E-mail download captured content ............................................................................................................. 19

6.4.3 E-mail download IRI .................................................................................................................................. 19

7 E-mail attributes ..................................................................................................................................... 19

7.0 Availability of information ............................................................................................................................... 19

7.1 E-mail protocol ID............................................................................................................................................ 20

7.2 E-mail address .................................................................................................................................................. 20

7.3 E-mail recipient list .......................................................................................................................................... 20

7.4 E-mail sender .................................................................................................................................................... 20

7.5 Total recipient count ......................................................................................................................................... 20

7.6 Message ID ....................................................................................................................................................... 20

7.7 Status ................................................................................................................................................................ 20

7.8 Server and client port ....................................................................................................................................... 21

7.9 Server and client octets sent ............................................................................................................................. 21

7.10 AAAInformation .............................................................................................................................................. 21

8 Unified Messaging events ...................................................................................................................... 21

8.0 Generic description........................................................................................................................................... 21

8.1 Delivery of CC ................................................................................................................................................. 22

ETSI
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4 ETSI TS 102 232-2 V3.12.1 (2020-08)

8.2 Messaging events ............................................................................................................................................. 23

8.3 Messaging box events ...................................................................................................................................... 24

8.4 Messaging notification events .......................................................................................................................... 25

8.5 Messaging call events ....................................................................................................................................... 26

8.6 Signalling of party information ........................................................................................................................ 26

8.7 Messaging properties ........................................................................................................................................ 27

Annex A (normative): SMTP .............................................................................................................. 30

A.1 SMTP introduction ................................................................................................................................. 30

A.2 SMTP HI2 events ................................................................................................................................... 30

A.2.1 E-mail login event ............................................................................................................................................ 30

A.2.2 E-mail send event ............................................................................................................................................. 30

A.2.3 E-mail receive event ......................................................................................................................................... 30

A.3 SMTP HI2 attributes .............................................................................................................................. 31

A.4 SMTP HI2 event-record mapping .......................................................................................................... 31

Annex B (normative): POP3 ............................................................................................................... 32

B.1 POP3 introduction .................................................................................................................................. 32

B.2 POP3 HI2 events .................................................................................................................................... 32

B.2.1 E-mail login event ............................................................................................................................................ 32

B.2.2 E-mail download event ..................................................................................................................................... 32

B.2.3 E-mail partial download event .......................................................................................................................... 32

B.3 POP3 HI2 attributes ............................................................................................................................... 33

B.4 POP3 HI2 event-record mapping ........................................................................................................... 33

B.5 POP3 HI3 delivery of Content of Communication ................................................................................ 34

B.6 POP3 Interception example .................................................................................................................... 34

Annex C (normative): IMAP4 ............................................................................................................. 35

C.1 IMAP4 introduction ............................................................................................................................... 35

C.2 IMAP4 HI2 event-record mapping ......................................................................................................... 35

C.3 IMAP4 HI3 delivery of call content ....................................................................................................... 36

C.4 IMAP4 Interception example ................................................................................................................. 36

Annex D (normative): Messaging ASN.1 ........................................................................................... 38

Annex E (informative): E-mail LI requirements ................................................................................. 46

E.1 HI2 requirements .................................................................................................................................... 46

E.2 HI3 requirements .................................................................................................................................... 47

E.3 General requirements ............................................................................................................................. 48

E.4 Requirements mapping ........................................................................................................................... 48

Annex F (informative): SMTP characteristics .................................................................................... 49

F.1 SMTP service characteristics ................................................................................................................. 49

F.2 SMTP protocol characteristics ............................................................................................................... 49

Annex G (informative): POP3 characteristics ...................................................................................... 50

G.1 POP3 service characteristics .................................................................................................................. 50

G.2 POP3 protocol characteristics ................................................................................................................ 50

ETSI
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5 ETSI TS 102 232-2 V3.12.1 (2020-08)

Annex H (informative): Discussion of webmail interception .............................................................. 51

H.1 Webmail network topology .................................................................................................................... 51

H.2 Webmail protocols ................................................................................................................................. 51

H.3 Webmail interception ............................................................................................................................. 52

Annex I (informative): Discussion for Driving HI2 of HI3 ................................................................ 53

I.1 Introduction ............................................................................................................................................ 53

I.2 Discussion .............................................................................................................................................. 53

I.2.1 Introduction ...................................................................................................................................................... 53

I.2.2 IP packets ......................................................................................................................................................... 54

I.2.3 TCP packets...................................................................................................................................................... 54

I.2.4 SMTP packets .................................................................................................................................................. 54

I.2.5 E-mail messages ............................................................................................................................................... 54

I.3 Conclusion .............................................................................................................................................. 55

Annex J (informative): Change Request History ................................................................................ 56

Annex K (informative): Bibliography ................................................................................................... 60

History .............................................................................................................................................................. 61

ETSI
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6 ETSI TS 102 232-2 V3.12.1 (2020-08)
Intellectual Property Rights
Essential patents

IPRs essential or potentially essential to normative deliverables 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 2 of a multi-part deliverable. Full details of the entire series can be found in part 1 [3].

The ASN.1 module is also available as an electronic attachment to the original document from the ETSI site (see details

in annex D).
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 present document describes what information is required for the handover of intercepted IP-based messaging traffic

from a Communications Service Provider to an LEMF. The present document covers a stage 2 description of the data,

but does not specify any functionality within the scope of ETSI TS 102 232-1 [3].

The Recommendation ITU-T I.130 [6] method for characterizing a service will be used as a general framework for the

present document. The modified concept of a "stage 1" will be called the "attributes" of the interface. The attributes of

the interface are the sum total of the entire constituent attributes that an interface may need to communicate. The

modified concept of a "stage 2" will be called the "events" of the interface. The events of the interface define the rules

of the relationships between the attributes that are required to arrange the disjoint attributes into meaningful information

for a messaging service interaction.

The present document is intended to be general enough to be used in a variety of messaging services. It should be

recognized that a side effect of this approach is some IRI fields identified may be difficult to extract or non-existent

depending on the messaging service being intercepted. In such cases it may be completely reasonable that the delivered

IRI contain empty fields or fields with the value 0.
ETSI
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7 ETSI TS 102 232-2 V3.12.1 (2020-08)
1 Scope

The present document contains a stage 1 like description of the interception information in relation to the process of

sending and receiving asynchronous messages. The present document also contains a stage 2 like description of when

Intercept Related Information (IRI) and Content of Communication (CC) need to be sent, and what information it needs

to contain.

Examples of asynchronous messages include: email, unified messaging and chat applications.

The definition of handover transport and encoding of HI2 and HI3 is outside the scope of the present document. Refer

to ETSI TS 102 232-1 [3].

The present document is designed to be used where appropriate in conjunction with other deliverables that define the

service specific IRI data formats. The present document aligns with 3GPP TS 33.108 [5], ETSI TS 101 671 [4], ETSI

TS 101 331 [1] and ETSI TR 101 944 [i.1].
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 101 331: "Lawful Interception (LI); Requirements of Law Enforcement Agencies".

[2] Void.

[3] 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".

[4] 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.

[5] ETSI TS 133 108: "Universal Mobile Telecommunications System (UMTS); LTE; Digital cellular

telecommunications system (Phase 2+) (GSM); 3G security; Handover interface for Lawful

Interception (LI) (3GPP TS 33.108)".

[6] Recommendation ITU-T I.130: "Method for the characterization of telecommunication services

supported by an ISDN and network capabilities of an ISDN".
[7] IETF RFC 5322: "Internet Message Format".
NOTE 1: IETF RFC 5322 obsoletes IETF RFC 2822: "Internet Message Format".

NOTE 2: IETF RFC 2822 obsoletes IETF RFC 0822: "Standard for the format of ARPA Internet text messages".

[8] IETF RFC 1939: "Post Office Protocol - Version 3".
ETSI
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8 ETSI TS 102 232-2 V3.12.1 (2020-08)
[9] IETF RFC 5321: "Simple Mail Transfer Protocol".
NOTE: IETF RFC 5321 obsoletes IETF RFC 2821: "Simple Mail Transfer Protocol".
[10] IETF RFC 3501: "Internet Message Access Protocol - Version 4rev1".

[11] Recommendation ITU-T X.680/ISO/IEC 8824-1: "Information technology - Abstract Syntax

Notation One (ASN.1): Specification of basic notation".

[12] ISO 3166-1: "Codes for the representation of names of countries and their subdivisions -- Part 1:

Country codes".
[13] IETF RFC 4954: "SMTP Service Extension for Authentication".

NOTE: IETF RFC 4954 obsoletes IETF RFC 2554: "SMTP Service Extension for Authentication".

[14] Void.
[15] IETF RFC 3493: "Basic Socket Interface Extensions for IPv6".
[16] IETF RFC 4422: "Simple Authentication and Security Layer (SASL)".

NOTE: IETF RFC 4422 obsoletes IETF RFC 2222: "Simple Authentication and Security Layer (SASL)".

[17] IETF RFC 3207: "SMTP Service Extension for Secure SMTP over Transport Layer Security".

[18] IETF RFC 2595: "Using TLS with IMAP, POP3 and ACAP".

[19] IETF RFC 4616: "The PLAIN Simple Authentication and Security Layer (SASL) Mechanism".

[20] IETF RFC 2045: "Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet

Message Bodies".

[21] IETF RFC 2046: "Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types".

[22] Void.

[23] ETSI EN 300 356 (all parts): "Integrated Services Digital Network (ISDN); Signalling System

No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface".
[24] IETF RFC 4646: "Tags for Identifying Languages".

[25] Recommendation ITU-T E.164: "The international public telecommunication numbering plan".

[26] IETF RFC 3696: "Application Techniques for Checking and Transformation of Names".

[27] Recommendation ITU-T E.212: "The international identification plan for public networks and

subscriptions".
[28] Void.
[29] IETF RFC 2806: "URLs for Telephone Calls".

[30] ETSI TS 124 229: "Digital cellular telecommunications system (Phase 2+) (GSM); Universal

Mobile Telecommunications System (UMTS); LTE; 5G; IP multimedia call control protocol based

on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3

(3GPP TS 24.229)".
[31] IETF RFC 791: "Internet Protocol".
[32] IETF RFC 3261: "SIP: Session Initiation Protocol".
[33] IETF RFC 7542: "The Network Access Identifier".
[34] IETF RFC 8200: "Internet Protocol, Version 6 (IPv6) Specification".

[35] IETF RFC 6335: "Internet Assigned Numbers Authority (IANA) Procedures for the Management

of the Service Name and Transport Protocol Port Number Registry".
ETSI
---------------------- Page: 8 ----------------------
9 ETSI TS 102 232-2 V3.12.1 (2020-08)

[36] ETSI TS 129 002: "Digital cellular telecommunications system (Phase 2+) (GSM); Universal

Mobile Telecommunications System (UMTS); LTE; 5G; Mobile Application Part (MAP)
specification (3GPP TS 29.002)".

[37] ETSI TS 123 003: "Digital cellular telecommunications system (Phase 2+) (GSM); Universal

Mobile Telecommunications System (UMTS); LTE; 5G; Numbering, addressing and identification

(3GPP TS 23.003)".

[38] ETSI TS 102 232-5: "Lawful Interception (LI); Handover Interface and Service-Specific Details

(SSD) for IP delivery; Part 5: Service-specific details for IP Multimedia Services".

[39] IETF RFC
...

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