POLICY MANAGEMENT in .NET

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Even though these rules are not as general as the ones that can be de ned by programming languages, policies expressed by these simple rules can be used for de ning a very wide variety of policies An example of the use of such rules is the Policy Description Language (PDL) [109] that is described in Section 6231 The advantage of using well-structured rules for de ning policies is that, since policies are expressed as simple and wellstructured rules they can be standardized fairly easily Hence, this approach supports reusability and interoperability across systems These types of policies are described in more detail below Condition action rules are expressed as if then statements For example, the following syntax can be used:
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If (C1 , C2 , , Cn ) then (A1 , A2 , , Am )
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where Ci is a condition that needs to be satis ed Conditions are usually statements that are true or false depending on values that speci c network or system parameters take For example, a condition might be true, when a node has been compromised (as detected by the IDS), the CPU utilization goes above 70 percent, or a link is loaded more than 80 percent Ai are actions that the policy system needs to implement These could be revoking the credentials of a compromised node, performing network recon gurations or changes in system con guration parameters, or implementing new rewall rules A simple condition action rule can be the following:
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If (node A has been compromised) then (revoke credentials of node A) and (migrate server from node A to node B)
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This policy states that, if node A is compromised (based on alerts provided by the IDS), then the credentials of the node need to be revoked and the server running on node A needs to be migrated from node A to node B A more complex policy may state that:
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If (node A has been compromised) or (node A CPU utilization 70 percent;) or (connectivity to node A is intermittent) then (migrate server from node A to node B)
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This policy states that, if the CPU of node A has been compromised, or is overloaded or if the connectivity to node A is intermittent (eg due to congestion or link unavailability), then the server needs to be migrated from node A to node B That would allow other nodes to more easily access the server and receive improved performance Event condition action rules are similar to condition action rules that are triggered only when speci c events occur These rules can be described as follows:
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(E1 , E2 , , Ek ) causes (A1 , A2 , , Am ) if (C1 , C2 , , Cn )
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where Ei is an event that occurs in the network or in one of the systems For example, an alert from the IDS system can be an event
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62 POLICY-BASED NETWORK MANAGEMENT
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Ai and Ci are events and conditions, respectively, and were explained in the condition action rule description A simple event condition action rule can be the following:
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(An alert from the IDS indicating node A is compromised) causes (node A s credentials to be revoked) if (IDS system is not compromised)
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This policy speci es that, if the IDS sends an alert indicating that node A has been compromised and if the IDS itself has not been compromised (and can be trusted), then the credentials of node A should be revoked Invariants are rules that can be used for making assertions and expressing truths that need to be maintained throughout the operation of the network A simple invariant rule can be the following:
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