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Kerberos Authentication

Kerberos Authentication. Kerberos. Requires shared secret with KDC ( perhaps not for PKINIT) Shared session key established Time synchronization needed Mutual Authentication Credentials allow impersonation. Authorization. How does the authentication mechanism fit in authorization topology

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Kerberos Authentication

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  1. Kerberos Authentication

  2. Kerberos • Requires shared secret with KDC ( perhaps not for PKINIT) • Shared session key established • Time synchronization needed • Mutual Authentication • Credentials allow impersonation

  3. Authorization • How does the authentication mechanism fit in authorization topology • Authorization based on authenticated identity (mapping may be needed) • Authorization within authentication messages (Kerberos auth data) • What are authorization messages bound to?

  4. Kerberos with Pull Model 1 User Org KDC User Org AAA Server TGT AST ID AM Secure Channel Application User AST, Auth OK KDC: Kerberos Key Distribution Center TGT: Ticket Granting Ticket AST: Application Service Ticket ID: Authenticate Identity AM: Message Authorizing Application by User Org

  5. Kerberos with Pull Model 2 User Org KDC User Org Authorization Server UOST UOST UOSTAuth TGT AST AM AST,(TGTkey), TGT ASTAuth Application User OK KDC: Kerberos Key Distribution Center TGT: Ticket Granting Ticket TGTKey: TGT key enc. w AST session key (KRB_CRED) UOST: User Org Authorization Server Service Ticket AST: Application Service Ticket AM: Message Authorizing Application by User Org

  6. Kerberos with Pull Model 3 User Org KDC User Org Authorization Server UOST Auth TGT UOST AM Application User UOST, Auth OK Secure Channel KDC: Kerberos Key Distribution Center TGT: Ticket Granting Ticket UOST: User Org Authorization Server Service Ticket Auth: Authenticator encrypted with session key AM: Message Authorizing Application by User Org

  7. Push Example User Org KDC User Org Authorization Server UOST TGT UOST CERT AST Application User CERT AST OK KDC: Kerberos Key Distribution Center TGT: Ticket Granting Ticket UOST: User Org Authorization Server Service Ticket CERT: Authorization For User Signed By User Org / Bind to User principal or ????

  8. Inter-Domain Pull Application Org KDC’ TR User Org KDC TGT’ User Org Authorization Server AST TGT TGT’ ID AM User AST Application OK KDC: User Org Kerberos Key Distribution Center KDC’: Application Org Kerberos Key Distribution Center TGT’: Application Org Ticket Granting Ticket AST: Application Service Ticket ID: Authenticate Identity AM: Message Authorizing Application by User Org TR: Trust Relationship

  9. Kerberos Inter-Realm Application Org KDC’ TR User Org KDC TGT’ TGT’ AST TGT User AST Application OK

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