LTE; Security of the mission critical service (3GPP TS 33.180 version 14.7.0 Release 14)

RTS/TSGS-0333180ve70

General Information

Status
Published
Publication Date
01-Jul-2019
Technical Committee
Current Stage
12 - Completion
Completion Date
02-Jul-2019
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ETSI TS 133 180 V14.7.0 (2019-07) - LTE; Security of the mission critical service (3GPP TS 33.180 version 14.7.0 Release 14)
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ETSI TS 133 180 V14.7.0 (2019-07)
TECHNICAL SPECIFICATION
LTE;
Security of the mission critical service
(3GPP TS 33.180 version 14.7.0 Release 14)
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3GPP TS 33.180 version 14.7.0 Release 14 1 ETSI TS 133 180 V14.7.0 (2019-07)
Reference
RTS/TSGS-0333180ve70
Keywords
LTE,SECURITY
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3GPP TS 33.180 version 14.7.0 Release 14 2 ETSI TS 133 180 V14.7.0 (2019-07)
Intellectual Property Rights
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ETSI
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3GPP TS 33.180 version 14.7.0 Release 14 3 ETSI TS 133 180 V14.7.0 (2019-07)
Contents

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

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

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

Foreword ............................................................................................................................................................. 9

1 Scope ...................................................................................................................................................... 10

2 References .............................................................................................................................................. 10

3 Definitions and abbreviations ................................................................................................................. 12

3.1 Definitions ........................................................................................................................................................ 12

3.2 Abbreviations ................................................................................................................................................... 13

4 Overview of Mission Critical Security ................................................................................................... 13

4.1 General ............................................................................................................................................................. 13

4.2 Signalling plane security architecture............................................................................................................... 14

4.3 MC system security architecture ...................................................................................................................... 14

4.3.1 General ........................................................................................................................................................ 14

4.3.2 User authentication and authorisation ......................................................................................................... 15

4.3.3 Identity keying of users and services .......................................................................................................... 15

4.3.4 Protection of application plane signalling ................................................................................................... 16

4.3.5 Media security ............................................................................................................................................ 17

4.3.5.1 General .................................................................................................................................................. 17

4.3.5.2 Media security for group communications. ........................................................................................... 17

4.3.5.3 Media security for private calls ............................................................................................................. 19

5 Common mission critical security framework ....................................................................................... 20

5.1 User authentication and authorization .............................................................................................................. 20

5.1.1 General ........................................................................................................................................................ 20

5.1.2 User authentication ..................................................................................................................................... 21

5.1.2.1 Identity management functional model ................................................................................................. 21

5.1.2.2 User authentication framework ............................................................................................................. 22

5.1.2.3 OpenID Connect (OIDC) ...................................................................................................................... 23

5.1.2.3.1 General ............................................................................................................................................ 23

5.1.2.3.2 User authentication example using username/password .................................................................. 24

5.1.3 MCX user service authorisation.................................................................................................................. 24

5.1.3.1 General .................................................................................................................................................. 24

5.1.3.2 MCX user service authorization with MCX Server .............................................................................. 27

5.1.3.2.1 General ............................................................................................................................................ 27

5.1.3.2.2 Using SIP REGISTER ..................................................................................................................... 27

5.1.3.2.3 Using SIP PUBLISH ....................................................................................................................... 28

5.1.4 Inter-domain MCX user service authorization ............................................................................................ 28

5.1.4.1 General .................................................................................................................................................. 28

5.1.4.2 Inter-domain identity management functional model ........................................................................... 28

5.2 Key management common elements ................................................................................................................ 30

5.2.1 Overview of key management .................................................................................................................... 30

5.2.2 Common key distribution ........................................................................................................................... 31

5.2.3 Key distribution with end-point diversity ................................................................................................... 32

5.2.4 Key distribution with associated parameters .............................................................................................. 35

5.2.5 Key distribution with SAKKE-to-self payload ........................................................................................... 36

5.2.6 Key distribution with identity hiding .......................................................................................................... 37

5.2.7 Key distribution across multiple security domains ..................................................................................... 38

5.2.7.1 General .................................................................................................................................................. 38

5.2.7.2 Identification of External Security Domains ......................................................................................... 38

5.2.7.3 Using multiple security domains ........................................................................................................... 39

5.3 User key management ...................................................................................................................................... 39

5.3.1 General ........................................................................................................................................................ 39

5.3.2 Functional model for key management ....................................................................................................... 39

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3GPP TS 33.180 version 14.7.0 Release 14 4 ETSI TS 133 180 V14.7.0 (2019-07)

5.3.3 Security procedures for key management ................................................................................................... 40

5.3.4 Provisioned key material to support end-to-end communication security .................................................. 42

5.3.5 KMS Certificate .......................................................................................................................................... 42

5.3.6 KMS provisioned Key Set .......................................................................................................................... 42

5.4 Key management from MC client to MC server (CSK upload) ....................................................................... 43

5.5 Key management between MCX servers (SPK) .............................................................................................. 43

5.6 Key management for one-to-one (private) communications (PCK) ................................................................. 43

5.7 Key management for group communications (GMK) ...................................................................................... 44

5.7.1 General ........................................................................................................................................................ 44

5.7.2 Security procedures for GMK provisioning ................................................................................................ 44

5.7.3 Group member GMK management ............................................................................................................ 45

5.8 Key management from MC server to MC client (Key download) ................................................................... 46

5.8.1 General ........................................................................................................................................................ 46

5.8.2 ‘Key download' procedure .......................................................................................................................... 46

5.9 Key management during MBMS bearer announcement ............................................................................. 47

5.10 UE key storage and key persistence ................................................................................................................. 47

5.10.1 Key storage ................................................................................................................................................. 47

5.10.2 Key persistence ........................................................................................................................................... 47

6 Supporting security mechanisms ............................................................................................................ 48

6.1 HTTP ................................................................................................................................................................ 48

6.1.1 Authentication for HTTP-1 interface .......................................................................................................... 48

6.1.2 HTTP-1 interface security .......................................................................................................................... 48

6.2 SIP .................................................................................................................................................................... 48

6.2.1 Authentication for SIP core access ............................................................................................................. 48

6.2.2 SIP-1 interface security ............................................................................................................................... 48

6.3 Network domain security ................................................................................................................................. 49

6.3.1 LTE access authentication and security ...................................................................................................... 49

6.3.2 Inter/Intra domain interface security ........................................................................................................... 49

7 MCPTT and MCVideo ........................................................................................................................... 49

7.1 General ............................................................................................................................................................. 49

7.2 Private communications ................................................................................................................................... 49

7.2.1 Key management ........................................................................................................................................ 49

7.2.2 Security procedures (on-network) ............................................................................................................... 49

7.2.3 Security procedures (off-network) .............................................................................................................. 51

7.2.4 First-to-answer security and key management ............................................................................................ 52

7.2.4.1 Overview ............................................................................................................................................... 52

7.2.4.2 First-to-answer request and response .................................................................................................... 53

7.2.4.3 First-to-answer call setup with security................................................................................................. 53

7.2.4.4 First-to-answer media protection .......................................................................................................... 55

7.2.5 Ambient listening call ................................................................................................................................. 55

7.2.6 Ambient viewing call .................................................................................................................................. 55

7.2.7 Private video pull ........................................................................................................................................ 56

7.2.7.1 One-to-one video pull ........................................................................................................................... 56

7.2.7.2 One-from-server video pull ................................................................................................................... 56

7.2.8 Private video push ....................................................................................................................................... 57

7.2.8.1 One-to-one video push .......................................................................................................................... 57

7.2.8.2 One-to-server video push ...................................................................................................................... 57

7.2.8.3 Remotely initiated video push ............................................................................................................... 58

7.3 Group communications .................................................................................................................................... 60

7.3.1 General ........................................................................................................................................................ 60

7.3.2 Group creation security procedure .............................................................................................................. 60

7.3.3 Dynamic group keying ................................................................................................................................ 60

7.3.3.1 General .................................................................................................................................................. 60

7.3.3.2 Group regrouping security procedure (within a single MC domain) .................................................... 61

7.3.3.3 Group regrouping security procedure (involving multiple MC domains) ............................................. 61

7.3.4 Broadcast group call ................................................................................................................................... 62

7.3.5 Group-broadcast group call......................................................................................................................... 62

7.3.6 Emergency group call ................................................................................................................................. 62

7.3.7 Imminent peril group call ........................................................................................................................... 63

7.3.8 Emergency Alert ......................................................................................................................................... 63

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3GPP TS 33.180 version 14.7.0 Release 14 5 ETSI TS 133 180 V14.7.0 (2019-07)

7.3.9 Remotely initiated video push to group ...................................................................................................... 64

7.4 Key derivation for media .................................................................................................................................. 65

7.4.1 Derivation of SRTP master keys for private call ........................................................................................ 65

7.4.2 Derivation of SRTP master keys for group media ...................................................................................... 66

7.5 Media protection profile ................................................................................................................................... 67

7.5.1 General ........................................................................................................................................................ 67

7.5.2 Security procedures for media stream protection........................................................................................ 68

8 MCData .................................................................................................................................................. 69

8.1 Overview .......................................................................................................................................................... 69

8.2 Key Management ............................................................................................................................................. 70

8.3 One-to-one communications ............................................................................................................................ 71

8.4 Group communications .................................................................................................................................... 72

8.5 MCData payload protection ............................................................................................................................. 72

8.5.1 General ........................................................................................................................................................ 72

8.5.2 Prequisites ................................................................................................................................................... 72

8.5.2.1 Prequisites for protected payloads ......................................................................................................... 72

8.5.2.2 Prequisites for authenticated payloads .................................................................................................. 72

8.5.3 Key derivation for protected payloads ........................................................................................................ 73

8.5.4 Payload protection ...................................................................................................................................... 73

8.5.4.1 Format of protected payloads ................................................................................................................ 73

8.5.4.2 Encryption of protected payloads .......................................................................................................... 73

8.5.5 Payload authentication ................................................................................................................................ 74

9 Signalling protection .............................................................................................................................. 74

9.1 General ............................................................................................................................................................. 74

9.2 Key distribution for signalling protection ........................................................................................................ 75

9.2.1 Client-Server Key (CSK) ............................................................................................................................ 75

9.2.1.1 General .................................................................................................................................................. 75

9.2.1.2 Creation of the CSK .............................................................................................................................. 75

9.2.1.3 Initial 'CSK Upload' Procedure ............................................................................................................. 76

9.2.1.4 CSK update via 'key download'............................................................................................................. 76

9.2.2 Multicast Signalling Key (MuSiK) ............................................................................................................. 77

9.2.3 Signalling Protection Key (SPK) ................................................................................................................ 78

9.3 Application signalling security (XML protection) ........................................................................................... 78

9.3.1 General ........................................................................................................................................................ 78

9.3.2 Protected content ........................................................................................................................................ 78

9.3.3 Key agreement ............................................................................................................................................ 79

9.3.4 Confidentiality protection using XML encryption (xmlenc) ...................................................................... 79

9.3.4.1 General .................................................................................................................................................. 79

9.3.4.2 XML content encryption ....................................................................................................................... 79

9.3.4.3 XML URI attribute encryption .............................................................................................................. 80

9.3.5 Integrity protection using XML signature (xmlsig) .................................................................................... 81

9.4 RTCP signalling protection (SRTCP) .............................................................................................................. 82

9.4.1 General ........................................................................................................................................................ 82

9.4.2 Unicast RTCP protection between client and server ................................................................................... 82

9.4.3 Multicast RTCP protection between client and server ................................................................................ 83

9.4.4 Offline floor and transmission control protection .........................................

...

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