Kerberos and Identity Federations Daniel Kouřil, Luděk Matyska, Michal Procházka, Tomáš Kubina AFS & Kerberos Best Practices Worshop 2008.

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Presentation transcript:

Kerberos and Identity Federations Daniel Kouřil, Luděk Matyska, Michal Procházka, Tomáš Kubina AFS & Kerberos Best Practices Worshop 2008

Identity Federations linking services and user management systems standardized protocols home institution keeps the most current data service & identity providers services trust clients‘ institutions modified trust model suitable for large infrastructure possible decreasing of users‘ credentials Shibboleth

Users‘ attributes Additional information published by IdP up-to-date any information from HR databases name, , affilitation,... allows for sophisticated access control policies groups of students of a course,... pseudoanonymity Security Assertion Markup Language

SAML assertion example urn:mace:dir:attribute-def:cnDaniel Kouřil urn:mace:dir:attribute-def:givenNameDaniel urn:mace:dir:attribute-def:snKouřil urn:mace:dir:attribute-def:oMasarykova univerzita urn:mace:dir:attribute-def:ouWplace-31200;Wplace ;Facult-1433 urn:mace:dir:attribute-def:eduPersonAffiliationmember;student; employee

Federations in web world schema from SWITCH AAI

Federation in non-web world no redirect mechanism PKI and federated certificates transporting IdP‘s assertions VPN-based solution as general infrastructure obtaining certificates explicit logging into federation

Federated CA bridge to non-federative services on-line CA running as SP in federation federation-based identity vetting GridShib CA key & certificate management done by browser certificates contain users attributes X.509 extension

Management of certificates browser-based solution not ideal GUI and framework desired Network Identity Manager extensible by plugins plugin to manage certificate in MS CertStore embedded browser to obtain certificate pilot implementation ready scheduled deployment at computer center at MU limitation of single identity provider in NIM

NIM plugin

Kerberos and federations many identity federations emerging local NRENs in Europe METACentre project in CR serving users from many institutions Kerberos Easy access for new users at least from selected institution registration and further access Utilizitation of federations

Kerberos and federations several ways possible KAML group no changes to infrastructure, easiness of use for end-users authorization data field for SAML transformation of federated certificates to tickets PKINIT + KDC modified to retain SAML simple, easy to implement SAML is copied from X.509 to TGT as authZ data all derived tickets will inherit the assertion Similar to MS PAC not signed currently SAML artifacts

SAML on Application Server authorization based on SAML attributes policy language authZ decision made by application or third-party component XACML Query/Response protocol components from Grid world „available“ krb5_recvauth (....); krb5_ticket_get_authorization_data_type( context, ticket, KRB5_AUTHDATA_SAML, &saml_data); process_saml_data(saml_data);

Conclusion Simple integration easy to done KDC, users-side tools, application server- side code & authZ service Kerberos as transport mechanism NIM plugin logging into federations useful for other environment as well collaborative systems, videoconferencing