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TECHNICAL SPECIFICATION
Digital cellular telecommunications system (Phase 2+) (GSM);
Universal Mobile Telecommunications System (UMTS);
LTE;
3G security;
Access security for IP-based services
(3GPP TS 33.203 version 15.1.0 Release 15)
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3GPP TS 33.203 version 15.1.0 Release 15 1 ETSI TS 133 203 V15.1.0 (2018-09)
Reference
RTS/TSGS-0333203vf10
Keywords
GSM,LTE,SECURITY,UMTS
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ETSI
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3GPP TS 33.203 version 15.1.0 Release 15 2 ETSI TS 133 203 V15.1.0 (2018-09)
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.
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Foreword
This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP).
The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or
GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables.
The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under
.
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.
ETSI
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3GPP TS 33.203 version 15.1.0 Release 15 3 ETSI TS 133 203 V15.1.0 (2018-09)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 9
1 Scope . 10
2 References . 10
3 Definitions, symbols and abbreviations . 13
3.1 Definitions . 13
3.2 Symbols . 13
3.3 Abbreviations . 13
4 Overview of the security architecture. 14
5 Security features . 17
5.1 Secure access to IMS . 17
5.1.1 Authentication of the subscriber and the network . 17
5.1.2 Re-Authentication of the subscriber . 17
5.1.3 Confidentiality protection . 17
5.1.4 Integrity protection . 18
5.2 Network topology hidi ng . 18
5.3 SIP Privacy handling in IMS Networks . 18
5.4 SIP Privacy handling when interworking with non-IMS Networks . 19
6 Security mechanisms . 19
6.1 Authentication and key agreement . 19
6.1.0 General . 19
6.1.1 Authentication of an IM-subscriber . 19
6.1.2 Authentication failures . 22
6.1.2.1 User authentication failure . 22
6.1.2.2 Network authentication failure . 22
6.1.2.3 Incomplete authentication . 23
6.1.3 Synchronization failure . 23
6.1.4 Network Initiated authentications . 24
6.1.5 Integrity protection indicator . 24
6.2 Confidentiality mechanisms . 25
6.3 Integrity mechanisms . 25
6.4 Hiding mechanisms . 25
6.5 CSCF interoperating with proxy located in a non-IMS network . 26
7 Security association set-up procedure . 26
7.0 General . 26
7.1 Security association parameters . 26
7.2 Set-up of security associations (successful case) . 30
7.3 Error cases in the set-up of security associations . 32
7.3.1 Error cases related to IMS AKA . 32
7.3.1.0 General . 32
7.3.1.1 User authentication failure . 32
7.3.1.2 Network authentication failure . 32
7.3.1.3 Synchronisation failure . 33
7.3.1.4 Incomplete authentication . 33
7.3.2 Error cases related to the Security-Set-up . 33
7.3.2.1 Proposal unacceptable to P-CSCF . 33
7.3.2.2 Proposal unacceptable to UE. 33
7.3.2.3 Failed consistency check of Security-Set-up lines at the P-CSCF . 33
7.4 Authenticated re-registration . 33
7.4.0 General . 33
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3GPP TS 33.203 version 15.1.0 Release 15 4 ETSI TS 133 203 V15.1.0 (2018-09)
7.4.1 Void . 34
7.4.1a Management of security associations in the UE . 34
7.4.2 Void . 34
7.4.2a Management of security associations in the P-CSCF . 35
7.5 Rules for security association handling when the UE changes IP address . 36
8 ISIM . 36
8.0 General . 36
8.1 Requirements on the ISIM application . 36
8.2 Sharing security functions and data with the USIM . 36
9 IMC . 38
Annex A (informative): Void . 39
Annex B (informative): Void . 40
Annex C (informative): Void . 41
Annex D (informative): Void . 42
Annex E (informative): Void . 43
Annex F (informative): Void . 44
Annex G (informative): Management of sequence numbers . 45
Annex H (normative): The use of "Security Mechanism Agreement for SIP Sessions" [21]
for security mode set-up . 46
Annex I (normative): Key expansion functions for IPsec ESP . 48
Annex J (informative): Recommendations to protect the IMS from UEs bypassing the
P-CSCF . 49
Annex K: Void . 50
Annex L (Normative): Application to fixed broadband access . 51
L.1 Introduction . 51
L.2 Application of clause 4 . 51
Annex M (normative): Enhancements to the access security for IP based services to enable
NAT traversal for signaling messages . 53
M.0 General . 53
M.1 Scope . 53
M.2 References . 53
M.3 Definitions, symbols and abbreviations . 53
M.4 Overview of the security architecture. 53
M.5 Security features . 53
M.6 Security mechanisms . 54
M.6.1 Authentication and key agreement . 54
M.6.2 Confidentiality mechanisms . 54
M.6.3 Integrity mechanisms . 54
M.6.4 Hiding mechanisms . 54
M.6.5 CSCF interoperating with proxy located in a non-IMS network . 55
M.7 Security association set-up procedure . 55
M.7.0 General . 55
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3GPP TS 33.203 version 15.1.0 Release 15 5 ETSI TS 133 203 V15.1.0 (2018-09)
M.7.1 Security association parameters . 55
M.7.2 Set-up of security associations (successful case) . 59
M.7.3 Error cases in the set-up of security associations . 64
M.7.3.1 Error cases related to IMS AKA . 64
M.7.3.2 Error cases related to the Security-Set-up . 64
M.7.3.2.1 Proposal unacceptable to P-CSCF . 64
M.7.3.2.2 Proposal unacceptable to UE. 64
M.7.3.2.3 Failed consistency check of Security-Set-up lines at the P-CSCF . 64
M.7.3.2.4 Missing NAT traversal capabilities in the presence of a NAT . 64
M.7.4 Authenticated re-registration . 64
M.7.4.0 General . 64
M.7.4.1 Void . 64
M.7.4.1a Management of security associations in the UE . 64
M.7.4.2 Void . 65
M.7.4.2a Management of security associations in the P-CSCF . 65
M.7.5 Rules for security association handling when the UE changes IP address . 66
M.8 ISIM . 66
M.9 IMC . 66
Annex N (normative): Enhancements to the access security to enable SIP Digest . 67
N.1 SIP Digest . 67
N.2 Authentication . 67
N.2.1 Authentication Requirements . 67
N.2.1.1 Authentication Requirements for Registrations . 67
N.2.1.2 Authentication Requirements for Non-registration Messages . 70
N.2.2 Authentication failures . 72
N.2.2.1 User Authentication failure . 72
N.2.2.2 Network authentication failure . 72
N.2.2.3 Incomplete Authentication . 72
N.2.3 SIP Digest synchronization failure . 72
N.2.4 Network Initiated authentications . 72
N.2.5 Support for dynamic password change . 73
Annex O (normative): Enhancements to the access security to enable TLS . 74
O.1 TLS . 74
O.1.1 TLS Access Security . 74
O.1.2 Confidentiality protection . 74
O.1.3 Integrity protection . 74
O.1.4 TLS integrity protection indicator . 75
O.2 TLS Session set-up procedure . 75
O.2.1 TLS Profile for TLS based access security. 75
O.2.2 TLS session set-up during registration . 76
O.2.3 TLS session set-up prior to Initial registration . 77
O.3 Error cases in the set-up of TLS sessions . 77
O.3.1 Error cases related to TLS . 77
O.3.1.0 General . 77
O.3.1.1 User authentication failure . 77
O.3.1.2 Network authentication failure . 77
O.3.1.3 Synchronisation failure . 78
O.3.1.4 Incomplete authentication . 78
O.3.2 Error cases related to the Security-Set-Up . 78
O.4 Management of TLS sessions. 78
O.4.1 Management of TLS sessions at the UE . 78
O.4.2 Management of TLS sessions at the P-CSCF . 78
O.4.3 Authenticated re-registration . 78
O.5 TLS Certificate Profile and Validation. 79
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3GPP TS 33.203 version 15.1.0 Release 15 6 ETSI TS 133 203 V15.1.0 (2018-09)
O.5.1 TLS Certificate . 79
O.5.2 Certificate validation . 79
O.5.3 Certificate Revocation . 79
Annex P (normative): Co-existence of authentication schemes IMS AKA, GPRS-IMS-
Bundled Authentication, NASS-IMS-bundled authentication, SIP
Digest and Trusted Node Authentication . 80
P.1 Scope of this Annex . 80
P.2 Requirements on co-existence of authentication schemes . 80
P.3 P-CSCF procedure selection . 80
P.4 Determination of requested authentication scheme in S-CSCF . 82
P.4.1 Stepwise approach . 82
P.4.2 Mechanisms for performing steps 1 to 3 in P.4.1 . 82
P.5 Co-existence of PANI-aware and other P-CSCFs . 84
P.6 Considerations on
...