Join: Credential(Role Manager, IssuedBy $Trusted CA) :: accept in Visual Studio .NET

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Join: Credential(Role Manager, IssuedBy $Trusted CA) :: accept
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This is a join group management policy for authorizing new members to join a group This policy speci es that, if the role of a node is a manager and the credentials
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62 POLICY-BASED NETWORK MANAGEMENT
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for the node have been issued from a trusted CA, then the node is allowed to join the group Another possible policy is as follows:
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Intrusion Response: Alert(CompromisedNode x, IssuedBy $Trusted IDS :: RevokeCredentials(Node x)
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This policy de nes that, if an alert is issued by a trusted IDS stating that node x has been compromised, then the credentials for node x should be revoked 62313 Rei Policy Language The Rei language is a policy language based on deontic language and therefore belongs to the second category of policy languages as discussed earlier The Rei language is described in [107] Rei de nes rights, prohibitions, obligations, and dispensations:
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rights are permissions that an entity has and can be expressed as actions that entities are allowed to perform if they meet speci c conditions; prohibitions are statements that do not allow entities to perform speci c actions; obligations are actions that a speci c entity must perform usually when speci c conditions are satis ed; dispensations are obligations that are not required to be performed anymore
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Policies are associated with an entity with a construct called has Below is an example policy:
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Has(administrator, right(LogOnAsRoot, RightsNotRevoked))
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This policy states that administrators are allowed to log on as long as their rights have not been revoked The Rei language has additional constructs for de ning actions, delegating rights, making requests, canceling requests, and revoking rights The details of the Rei language are described in [107] 62314 Policy Description Language The Policy Description Language (PDL) was developed by Lucent [109] with a focus on network management PDL was implemented in Lucent s softswitch product for handling voiceover IP calls, but is general and applies to other applications Policies in PDL are de ned as event condition action rules and therefore belong to the third category of policy languages discussed earlier In PDL, policies are a collection of propositions of two types: policy rules and policy-de ned events These two types of propositions are de ned below 1 Policy rules are statements with the following format:
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Event causes action if condition
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This type of proposition speci es that, when a speci c event occurs, a speci c action is triggered by the policy management system if a speci c condition is true
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POLICY MANAGEMENT
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2 Policy de ned events (pde) have the following format:
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Event triggers pde (m1 t1, , mk tk) if condition
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This type of proposition speci es that, when a speci c event occurs and a speci c condition is true, then that triggers a set of events (which are policy-de ned events) within a prede ned period of time speci c to the application with the valuation of tk for each attribute mk The strength of the PDL language is its exibility in de ning events in policies Events can be either of two types They can be a basic simple event or they can be complex events that include several events within a prespeci ed period of time Complex events include the following: 1 e1 & e2 & & en, which means that all events occurred within the prespeci ed period of time; 2 e1 j e2j jen, which means that any of the events occurred within the prespeci ed period of time; 3 !e, which means that there was no occurrence of the event within the prespeci ed period of time; 4 ^e, which means that there was a sequence of one or more occurrences of the event Additional complex events are de ned in [109] and are omitted here for brevity Some complex functions are also de ned and can be used when stating conditions in policies For example, the function Count counts the number of occurrences of a speci c event within the prespeci ed period of time Functions Min, Max, Sum, and Avg can also be used for specifying the number of occurrences of a type of event Below is an example policy based on the discussion in [109] The policy shown below de nes a policy-de ned event as de ned earlier called response_mode The goal of this policy is to trigger a response once the system is receiving a large number of alerts from the IDS The response_mode event is triggered as follows:
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