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1.4 Relationship to Other Protocols

The S4U extensions are based on the Kerberos Protocol, as specified in [RFC4120]. [RFC4120] also details the dependence on lower-layer protocols such as TCP and UDP. Applications using other protocols can use S4U to create a common authorization path within the application.

The S4U2self extension can be used to obtain a privilege attribute certificate (PAC), as specified in [MS-PAC], to determine the authorization capabilities of the user. In addition, the PAC is used in the S4U2proxy extension to validate that S4U2proxy service tickets have not been misused.

The referral mechanism, as specified in [Referrals], is used in the S4U2self protocol extension if the user's realm is different from that of the service trying to obtain an S4U2self service ticket.

Microsoft Kerberos Protocol Extensions, as specified in [MS-KILE], includes extensions that provide platform-specific data to support the encoding of authorization data ([MS-PAC], section 2) in the authorization data field ([RFC4120], sections 5.2.6 and 5.2.7) of the ticket.

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