Access Control Models in .NET

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Access Control Models
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Rights should be assigned according to the need-to-know (least privilege) principle, in which each role gets only the rights required to perform their duties. New roles appear and some roles may not be needed any more: changes to roles and their rights should be easy to perform. The assignment of rights should be independent of the system implementation.
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Solution
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Define the use cases of the system. The design of object-oriented systems always starts this way, but even systems that use other methodologies often define use cases as part of the requirements stage. As use cases define the interactions of actors with the system, we can interpret actors as roles. The roles that appear in a use case must be authorized for all the operations initiated by the role, or the role could not perform its functions. If we collect all the operations performed by a role over all use cases, they define the necessary rights for this role. To make this approach more detailed and systematic, we should build a use case diagram that displays all the use cases for the system, and sequence diagrams that show the interactions of roles with the system for each use case. The figure below shows a generic sequence diagram indicating that actor role1 must use operations op1, op2, opN to interact with the system. This means that role1 should be given the rights to apply these operations to the system.
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actor role1: op1 op2 object1: object2: objectN:
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Generic sequence diagram to obtain rights for a role
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Implementation
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Consider the following steps in order to implement the solution: 1. Start by building a use case diagram to display all the use cases of the system. The actors in this diagram correspond to roles and we can capture all the required roles in this way.
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Role Rights Definition 261
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2. Build sequence diagrams for each use case. There is a sequence diagram for the main flow and a few more diagrams for alternate flows [Lar05]. 3. Analyze all the sequence diagrams to see what operations the actors (roles) need to apply to interact with the system. These operations correspond to the role rights. In fact, these rights could be generated automatically from the use cases tools such as Rational Rose can keep track of use cases, and they could be extended to generate the required authorization rules. One can also find all this information in the textual descriptions of the use cases, but it is harder to see the interactions, the sequence diagrams make the interactions more explicit. 4. From the use case exceptions the administrator implements the actions needed for security violations. 5. Addition or deletion of authorization rules is only necessary if a use case is added or deleted, or some of the actions of a use case are changed. In a centralized system, authorizations could be enforced at the user interface, while in a distributed system, authorization could be enforced in a centralized system component such as the application server. Object-oriented systems use approaches based on model-view separation, for example the MVC or PAC architectures [POSA1]. These two models separate the conceptual model objects a digital item in our example from user interfaces that can observe and modify these conceptual objects. The user views should be defined based on use cases [Losa97], and it is clear that they should be the only way to interact with the system. The user views should have access to the set of authorization rules to allow or deny access to the conceptual objects in the system. Sequences of use cases can be used to define a workflow that requires a specific set of authorizations for different roles. For example, a digital item can only be added by the vendor, released by the administrator, purchased, and downloaded by the subscriber, in that order. This complete workflow could be authorized as a unit.
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