Securing Windows Server 2008 in .NET

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FIGURE 4-32 Creating a new rule
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FIGURE 4-33 An action for a new rule
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Numerous types of rules are available, and the rules can be applied in multiple locations, such as via group policy or locally Apply rules in the following order, allowing control of the nal rule set that a rewall uses:
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Service restrictions, which have the highest priority because services typically are a target for hackers due to their power Connection security rules Authenticated bypass rules Block rules Allow rules Default rules
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Finally, export the con guration of a server to a le via the Export Policy action, which is available when the root console tree item is selected and the con guration is imported via the Import Policy action
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Command-Line Windows Firewall Con guration Use the netsh command for command-line con guration of the rewall via the adv rewall switch, which exposes a lot of functionality, including viewing information For example, you can view the con guration of a pro le (for example, the domain pro le) by using the following command
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C:\>netsh adv rewall show domainpro le Domain Pro le Settings: -------------------------------------------------------------State ON Firewall Policy BlockInbound,AllowOutbound LocalFirewallRules N/A (GPO-store only) LocalConSecRules N/A (GPO-store only) InboundUserNoti cation Disable RemoteManagement Disable UnicastResponseToMulticast Enable Logging: LogAllowedConnections LogDroppedConnections FileName Firewall\p rewalllog MaxFileSize Ok
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Disable Enable C:\Windows\system32\LogFiles\ 4096
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Export and import con guration via the netsh adv rewall export < lename> and netsh adv rewall import < lename> commands To create rules, use the netsh adv rewall rewall add rule command along with a number of options, such as the rule name, protocol, port, direction, and action Examples of the various commands are available in the command-line help, which is thorough You can quickly turn off Windows Firewall for all pro les by using netsh adv rewall set allpro les state off, and you can use netsh adv rewall set allpro les state on to enable it
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Monitoring The monitoring section allows monitoring of the enabled rewall rules on the server via the Firewall section, and the Connection Security Rules section shows information on enabled connection security rules The Security Associations area displays information about security associations between machines using IPsec, including information on the IP addresses, authentication, and encryption used Group Policy Options The Group Policy area for Windows Firewall with Advanced Con guration is detailed and allows rules to be de ned in group policy, con guration of whether local rules should be used, and IPsec con guration Under Computer Con guration, Policies, Windows Settings, Security Settings, Windows Firewall with Advanced Security, Windows Firewall with Advanced Security (yes, twice), you can perform full con guration, such as con guration of the various states for the domain, private and public pro les, and rules As shown in Figure 4-34, the dialogs you use are the same as those used via the Windows Firewall with Advanced Con guration MMC snap-in, even the rule creation wizards The only real difference is that with the GPO editor, you don t get an Actions pane
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FIGURE 4-34 Con guration via GPO of rewall con guration There are some settings you can apply only via group policy For example, the application of local rewall and connection security rules can be enabled/disabled via the Customize button for the settings of a pro le within a GPO, which allows you to set whether locally con gured rules on a server/desktop are ignored Everything else is the same as using the GPO Editor for rewall con guration, and sometimes con guring multiple servers/computers by using the GPO Editor makes the most sense, especially when we consider IPsec
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IPsec enables you to encrypt IP information sent between two servers to protect the information being transmitted Because IPsec operates at Layer 3 in the protocol stack, there are no changes to any applications or services that use IP; the encryption takes place without the knowledge of any user of IP IPsec provides end-to-end security between two machines, and it is useful if there are IP services or applications that inherently are not secure and perhaps send password information unencrypted (for example, Telnet,
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