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Unfortunately, code written using capabilities tends to concentrate on the low-level mechanism rather than the high-level policy, and the parts implementing the policy tend to be tangled with the parts implementing the functionality. The object-capability model is a de-facto industry standard widely adopted for the implementation of security policies for web based software. In statically typed languages, adherence of code to the capability policies relies heavily on the guarantees provided by type system features such as final and private. In these specifications, the conclusions but also the premises may relate to the state before as well as after execution, the code may be existentially or universally quantified, and interpretation quantifies over all modules extending the current module. We use execution observations to write the formal specification of five out of the six informal policies in the mint example, famous in the object capability literature. To give precise semantics to capability policy specifications, we propose execution observations, which talk about various properties of a program’s execution.
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Moreover, we argue that we need methodologies with which to prove that programs adhere to their capability policies as specified. We also argue that the specification of capability policies requires concepts that go beyond the features of current specification languages. In this paper we argue that capability policies should be made explicit and written separately from the code implementing them. Such policies tend to restrict the objects and the circumstances which may access services. We call capability policies the policies enforced by programs using object capabilities. The object capability model is a de-facto industry standard widely adopted for the implementation of secure software.
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