Req 24 an ims service provider relying on a third

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- REQ 2.4: An IMS service provider relying on a third party authentication service for authenticating or authorizing WebRTC IMS Clients (WIC), shall securely determine from the received authorization information the IMPI and IMPU of the authenticated WIC attempting to register with the IMS network. NOTE: In a use-case where IMPI is associated with multiple IMPUs, IMPI to IMPU association check when I-CSCF User Registration Query is processed by the HSS, is not enough. For ex ample . , a user who has authenticated to the WWSF as sip:[email protected] but changes "To" field in the W2 REGISTER message to sip:[email protected], will not be detected by the IMS network. It is therefore necessary to determine IMPU and IMPI of the authenticated user from the received authorization information. - REQ 2.5: It shall be ensured that a third party authenticating and authorizing a WebRTC IMS Client the authentication service has enough information to guarantee that the user is entitled to use the IMS private identity IMPI determined from the user's web identity authenticated by the third party authentication service . - REQ 2.6: The eP-CSCF shall verify that the WIC establishing the signalling connection with the eP-CSCF comes from a trusted domain. X.3.2 Solution 2. 1 for Scenario 2 X.3.2.1 General In this the present registration scenario it is assumed that the user has a subscription with an individual IMPU, but uses a web identity and authentication scheme to authenticate with the WWSF or the WAF. (Whether it is the WWSF or the WAF depends on the deployment.) Editor’s Note: The consistent use of the terms third party authentication service, authentication service, WWSF, WAF, authorization server, etc. is ffs . X.3.2.2 Requirements All requirements for solution 2. 1 are covered in clause X.3.1. 3GPP 3GPP TS 33.203 V12.67.0 (2014-0609) 133 Release 12
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X.3.2.3 Procedures The procedure provided in this clause is split into a normative part and non-normative part: the description for the interfaces between eP-CSCF, I-/S-CSCF and HSS is normative while the description for the interfaces W1, W2 and W4 is only by way of example. NOTE 1: This split into a normative part and a non-normative part is due to 3GPP’s decision not to standardise the interfaces W1, W2 and W4 in the present release. For the non-normative part, the procedure allows for various realisations that are out of scope of 3GPP for the present release. All realisations have in common that the WAF issues authorization tokens that are provided to the WIC via the WWSF. The WIC presents this authorization token to the eP-CSCF during the IMS registration. The validation of the authorization token by the eP-CSCF is specific to the particular realisation. The authorization token allows the eP-CSCF to retrieve the IMS subscriber identity, the WAF and WWSF identities, validity period, and possible other authorization parameters.
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