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Extra info for Computers & Security (March)

Sample text

It is a custom, stateless protocol that was created for ease of development. Messages are sent from Sython to sythond using Python’s object serialization facility. Each request is a Python Dictionary object containing some predefined command symbols. These symbols are V, CC, cmd, and data. V represents version and is currently an integer with the value 1. CC is short for client code; it uniquely maps the client to a specific namespace within sythond. cmd is the current command to be executed and is a string value.

Task 2: scanning subject policy file in order to retrieve an appropriate policy (implemented by scanSubjectPolicy File( )). boolean policyEvaluation (Policy p, Request r) { Boolean found=false; goto the associated subject file /*The loop evaluates the cred-expr field of the policy against the subject types found in the subject profile of the subject subj-id. */ for(i=0;i

Does the requesting subject own the credential type given in the cred-expr of the request? 3. Is the path of the request equal to that of the policy and is any of the following cases also addressed? a. The target of both policy and request is similar. b. The target of the request is an XML file and the evaluated policy’s target is the DTD that is followed by the request’s target. In case that there is no matching policy found in the subject policy file, we have to scan the part of the policy base containing policies relating to the obj-cat of the target in the input access request.

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Computers & Security (March)


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