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Agenda

CS G513 / SS G513 Network Security. Agenda. Access Control Basic Model. Different Strategies and Approaches. Authorization. Access Control. Objects. Subjects. Auditing. Authentication. Generic Security Model for (Resource) Access.

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Agenda

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  1. CS G513 / SS G513 Network Security Agenda Access Control Basic Model. Different Strategies and Approaches

  2. Authorization Access Control Objects Subjects Auditing Authentication Generic Security Model for (Resource) Access Determination of safety/security of access based on policies; authentication is a pre-requisite Administrate Recording of access events for analysis – may identify security violations Identity establishment Fig. from Essmayr, Probst & Weippl

  3. Categorization of Access Control Mechanisms • Authorization can be • Rule-based, • Rules of the form (s, t, o, c, m): subject s has access of type t to object o under condition c; m is additional information (e.g. grantor of authorization) • Multi-level, • Subjects and objects are assigned security levels and flow (of information) regulated between levels. OR • Mixed • Administration can be • Centralized, • Decentralized, or • Mixed Sundar B.

  4. Approaches to Access Control • Discretionary Access Control • Rule-based, Decentralized (e.g. per object) • Commonly used • Mandatory Access Control • Multilevel, Centralized • Used in the military • Bell – LaPadula Model • Mixed, Decentralized • Proposed for U.S. DoD • Focused on confidentiality – • A.k.a “No read up, No write down” Sundar B.

  5. Approaches to Access Control • User-Based Access Control (UBAC) • Rule-based • Rules per identity • Role-Based Access Control (RBAC) • A user may have many roles – • Could be more dynamic than UBAC • Roles may be defined through groups (static?) – e.g Unix • Policy-Based Access Control (PBAC) • Access Control Lists mix policy with mechanism (i.e. enforcement) – • PBAC separates policy from enforcement (mechanism) Sundar B.

  6. Approaches to Access Control • Content Dependent Access Control (CDAC) • Rule-based • Rules are dependent on the (info.) content of the object • Useful for logical control of (access to) typed data • Context-Based Access Control (RBAC) • Access control is based on sequence of events leading to access. – used in firewalls. • View-Based Access Control (PBAC) • Useful for databases Sundar B.

  7. Access Control Approaches • Windows • ??? • Unix • ??? • Oracle • ??? • ATM • ??? • Firewalls • ??? • Exercises  Sundar B.

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