LTE; Security of Mission Critical Push To Talk (MCPTT) over LTE (3GPP TS 33.179 version 13.9.0 Release 13)

RTS/TSGS-0333179vd90

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Status
Published
Publication Date
01-Jul-2019
Technical Committee
Current Stage
12 - Completion
Completion Date
02-Jul-2019
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ETSI TS 133 179 V13.9.0 (2019-07) - LTE; Security of Mission Critical Push To Talk (MCPTT) over LTE (3GPP TS 33.179 version 13.9.0 Release 13)
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ETSI TS 133 179 V13.9.0 (2019-07)
TECHNICAL SPECIFICATION
LTE;
Security of Mission Critical Push To Talk (MCPTT) over LTE
(3GPP TS 33.179 version 13.9.0 Release 13)
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3GPP TS 33.179 version 13.9.0 Release 13 1 ETSI TS 133 179 V13.9.0 (2019-07)
Reference
RTS/TSGS-0333179vd90
Keywords
LTE,SECURITY
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3GPP TS 33.179 version 13.9.0 Release 13 2 ETSI TS 133 179 V13.9.0 (2019-07)
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ETSI
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3GPP TS 33.179 version 13.9.0 Release 13 3 ETSI TS 133 179 V13.9.0 (2019-07)
Contents

Intellectual Property Rights ................................................................................................................................ 2

Legal Notice ....................................................................................................................................................... 2

Modal verbs terminology .................................................................................................................................... 2

Foreword ............................................................................................................................................................. 7

1 Scope ........................................................................................................................................................ 8

2 References ................................................................................................................................................ 8

3 Definitions and abbreviations ................................................................................................................. 10

3.1 Definitions ........................................................................................................................................................ 10

3.2 Abbreviations ................................................................................................................................................... 10

4 Overview of MCPTT security ................................................................................................................ 10

4.1 General ............................................................................................................................................................. 10

4.2 Signalling plane security architecture............................................................................................................... 11

4.3 Application plane security architecture ............................................................................................................ 11

4.3.1 General ........................................................................................................................................................ 11

4.3.2 User authentication and authorisation ......................................................................................................... 12

4.3.3 Identity keying of users and services .......................................................................................................... 12

4.3.4 Protection of application plane signalling ................................................................................................... 13

4.3.5 Media security ............................................................................................................................................ 14

4.3.5.1 General .................................................................................................................................................. 14

4.3.5.2 Media security for group communications. ........................................................................................... 14

4.3.5.3 Media security for private calls ............................................................................................................. 15

5 Authentication and authorization ........................................................................................................... 16

5.1 General ............................................................................................................................................................. 16

5.2 LTE access authentication and security mechanism......................................................................................... 17

5.3 Authentication for SIP core access ................................................................................................................... 17

5.4 Authentication for HTTP-1 .............................................................................................................................. 17

5.5 User authentication ........................................................................................................................................... 17

5.5.1 Identity management functional model ....................................................................................................... 17

5.5.2 User authentication framework ................................................................................................................... 19

5.5.3 OpenID Connect (OIDC) ............................................................................................................................ 19

5.5.3.1 General .................................................................................................................................................. 19

5.5.3.2 User authentication example using Username/Password ...................................................................... 21

5.6 MCPTT user authorization ............................................................................................................................... 21

5.6.1 General ........................................................................................................................................................ 21

5.6.2 MCPTT user service authorization with MCPTT Server............................................................................ 23

5.6.2.0 General .................................................................................................................................................. 23

5.6.2.1 Using SIP REGISTER .......................................................................................................................... 23

5.6.2.2 Using SIP PUBLISH ............................................................................................................................. 24

6 Signalling plane protection ..................................................................................................................... 25

6.1 SIP-1 interface security .................................................................................................................................... 25

6.2 HTTP-1 interface security ................................................................................................................................ 25

7 End-to-end communication security ...................................................................................................... 25

7.1 Overview .......................................................................................................................................................... 25

7.2 Key provisioning and management .................................................................................................................. 26

7.2.1 General ........................................................................................................................................................ 26

7.2.2 Functional model for key management ....................................................................................................... 26

7.2.2.0 General .................................................................................................................................................. 26

7.2.2.1 Reference point CSC-8 (between key management server and the key management client within

the MCPTT UE) .................................................................................................................................... 27

7.2.2.2 Reference point CSC-9 (between the key management server and the key management client

within the MCPTT Server) .................................................................................................................... 27

ETSI
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3GPP TS 33.179 version 13.9.0 Release 13 4 ETSI TS 133 179 V13.9.0 (2019-07)

7.2.2.3 Reference point CSC-10 (between the key management server and the key management client

within a group management server) ...................................................................................................... 27

7.2.3 Security procedures for key management ................................................................................................... 27

7.2.4 Provisioned key material to support end-to-end communication security .................................................. 29

7.3 Group call key distribution ............................................................................................................................... 29

7.3.1 General ........................................................................................................................................................ 29

7.3.2 Security procedures for GMK provisioning ................................................................................................ 31

7.3.3 Key Identification and purpose tags............................................................................................................ 32

7.3.4 Group creation procedure ........................................................................................................................... 32

7.3.5 Dynamic group keying ................................................................................................................................ 33

7.3.5.1 General .................................................................................................................................................. 33

7.3.5.2 Group regrouping procedures (within a single MCPTT system) .......................................................... 33

7.3.5.3 Group regrouping procedures (involving multiple MCPTT systems) ................................................... 33

7.3.6 Derivation of SRTP/SRTCP master keys ................................................................................................... 34

7.3.7 Group member GMK management ............................................................................................................ 35

7.4 Private call key distribution .............................................................................................................................. 35

7.4.1 General ........................................................................................................................................................ 35

7.4.2 Security procedures (on-network) ............................................................................................................... 37

7.4.3 Security procedures (off-network) .............................................................................................................. 38

7.4.4 Derivation of SRTP/SRTCP master keys ................................................................................................... 39

7.4.5 Void ............................................................................................................................................................ 40

7.5 Protection of media stream (SRTP) .................................................................................................................. 40

7.5.1 General ........................................................................................................................................................ 40

7.5.2 Security procedures for media stream protection........................................................................................ 41

7.6 Protection of offline floor and media control signalling (SRTCP) ................................................................... 42

7.6.1 General ........................................................................................................................................................ 42

7.6.2 Security procedures for offline floor and media control protection ............................................................ 43

7.7 Protection of MBMS subchannel control messages (SRTCP) ......................................................................... 44

7.7.1 General ........................................................................................................................................................ 44

7.7.2 Key distribution .......................................................................................................................................... 44

7.7.3 Derivation of SRTCP master keys .............................................................................................................. 45

8 Inter/Intra domain interface security ...................................................................................................... 46

8.1 General ............................................................................................................................................................. 46

9 Protection of floor control and sensitive application signalling ............................................................. 46

9.1 Key agreement for protection of floor control and sensitive application data (Client to Server) ..................... 46

9.1.1 Identity-based key management for Client Server Key (CSK) ................................................................... 46

9.1.2 Creation of the CSK .................................................................................................................................... 47

9.1.3 Secure distribution of the CSK ................................................................................................................... 47

9.1.3.0 General .................................................................................................................................................. 47

9.1.3.1 MIKEY-SAKKE I_MESSAGE ............................................................................................................ 47

9.1.3.2 Distribution of CSK during MCPTT Service Authorization and group subscription ........................... 48

9.1.3.3 Obtaining CSK from the I_MESSAGE................................................................................................. 48

9.1.3.4 Procedure .............................................................................................................................................. 48

9.2 Key agreement for protection of floor control and sensitive application data between servers ....................... 49

9.3 Protection of XML content ............................................................................................................................... 50

9.3.1 General ........................................................................................................................................................ 50

9.3.2 Protected content ........................................................................................................................................ 50

9.3.3 Key agreement ............................................................................................................................................ 51

9.3.4 Confidentiality protection using XML encryption (xmlenc) ...................................................................... 51

9.3.4.1 General .................................................................................................................................................. 51

9.3.4.2 XML content encryption ....................................................................................................................... 51

9.3.4.3 XML URI attribute encryption .............................................................................................................. 52

9.3.5 Integrity protection using XML signature (xmlsig) .................................................................................... 53

9.4 Key agreement for online floor control (SRTCP) ............................................................................................ 54

9.4.1 General ............................................................................................................................................................. 54

9.4.2 Key agreement between MCPTT client and MCPTT Server ........................................................................... 54

9.4.3 Key agreement between MCPTT Servers ........................................................................................................ 54

9.4.4 Key agreement for multicast from MCPTT Server .......................................................................................... 54

9.4.5 Derivation of SRTCP key material ................................................................................................................... 54

Annex A (normative): Security requirements ................................................................................... 56

ETSI
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3GPP TS 33.179 version 13.9.0 Release 13 5 ETSI TS 133 179 V13.9.0 (2019-07)

A.0 Introduction ............................................................................................................................................ 56

A.1 Configuration & service access .............................................................................................................. 56

A.2 Group key management.......................................................................................................................... 56

A.3 On-network operation............................................................................................................................. 56

A.4 Ambient listening ................................................................................................................................... 57

A.5 Data communication between MCPTT network entities ....................................................................... 57

A.6 Key stream re-use ................................................................................................................................... 57

A.7 Late entry to group communication ....................................................................................................... 58

A.8 Private call confidentiality ...................................................................................................................... 58

A.9 Off-network operation ............................................................................................................................ 58

A.10 Privacy of MCPTT identities ................................................................................................................. 58

A.11 User authentication and authorization requirements .............................................................................. 59

Annex B (normative): OpenID connect profile for MCPTT ............................................................ 60

B.0 General ................................................................................................................................................... 60

B.1 MCPTT tokens ....................................................................................................................................... 60

B.1.1 ID token ............................................................................................................................................................ 60

B.1.1.0 General ........................................................................................................................................................ 60

B.1.1.1 Standard claims ........................................................................................................................................... 60

B.1.1.2 MCPTT claims ............................................................................................................................................ 60

B.1.2 Access token ..................................................................................................................................................... 61

B.1.2.0 Introduction................................................................................................................................................. 61

B.1.2.1 Standard claims ........................................................................................................................................... 61

B.1.2.2 MCPTT claims ............................................................................................................................................ 61

B.2 MCPTT client registration...................................................................................................................... 61

B.3 Obtaining tokens .................................................................................................................................... 61

B.3.0 General ............................................................................................................................................................. 61

B.3.1 Native MCPTT client ....................................................................................................................................... 62

B.3.1.0 General ........................................................................................................................................................ 62

B.3.1.1 Authentication Request ............................................................................................................................... 62

B.3.1.2 Authentication response .............................................................................................................................. 63

B.3.1.3 Token request .............................................................................................................................................. 64

B.3.1.4 Token Response .......................................................................................................................................... 64

B.4 Refreshing an access token ..................................................................................................................... 65

B.4.0 General ............................................................................................................................................................. 65

B.4.1 Access token request ........................................................................................................................................ 65

B.4.2 Access token response ...................................................................................................................................... 66

B.5 Using the token to access MCPTT resource servers .............................................................................. 66

B.6 Token validation ..................................................................................................................................... 67

B.6.1 ID token validation ........................................................................................................................................... 67

B.6.2 Access token validation .................................................................................................................................... 67

B.7 IdMS interface security .......................................................................................................................... 67

Annex C (informative): OpenID connect detailed flow ....................................................................... 68

C.1 Detailed flow for MCPTT user authentication and registration using OpenID Connect ....................... 68

Annex D (Normative): KMS provisioning messages to support MCPTT ....................................... 70

D.1 General aspects ....................................................................................................................................... 70

ETSI
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3GPP TS 33.179 version 13.9.0 Release 13 6 ETSI TS 133 179 V13.9.0 (2019-07)

D.2 KMS requests ......................................................................................................................................... 70

D.3 KMS responses ....................................................................................................................................... 71

D.3.0 General ............................................................................................................................................................. 71

D.3.1 KMS certificates ........................................................
...

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