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Extra info for A Guide to Ingres: A User's Guide to the Ingres Product

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7. The PIP module retrieves the attributes interacting directly with Subject, Resource, and Environment. 8. The PIP sends the attributes just obtained to the Context Handler. 9. The Context Handler inserts the resource in the context created at step 4. 10. The attributes obtained from the PIP and eventually the resource involved in the access request are sent by the Context Handler to the PDP. The PDP can now evaluate the policies and take a decision. 11. The PDP sends to the Context Handler the XACML response context that includes the final decision.

The major drawback of this approach is that a single policy simply cannot capture all the protection requirements that may arise over time. Recent proposals have worked towards languages and models able to express, in a single framework, different access control policies, to the goal of providing a single mechanism able to enforce multiple policies. Logic-based languages, for their expressive power and formal foundations, represent a good candidate. The main advantages of using a logic-based language can be summarized as follows: the semantic of a logic language is clear and unambiguous; logic languages are very expressive and can be used to represent any kind of policy; logic languages are declarative and offer a better abstraction level than imperative programming languages.

In an open scenario, mutual access control is an important security feature in which a client should be able to prove its eligibility for a service, and the server communicates to the client the requirements it needs to satisfy to get access. Credential-based access control rules. It is necessary to develop languages supporting access control rules based on credentials and these languages have to be flexible and expressive enough for users. The most important challenge in defining a language is the trade off between expressiveness and simplicity: the language should be expressive enough for defining different kinds of policies and simple enough for the final user.

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