vb.net free barcode component CHapTER 24 Managing Client Protection in C#

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1142 CHapTER 24 Managing Client Protection
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based on an application s metadata, such as Trust Microsoft Office if it is signed and the version is greater than 12 .0 .0 .0 . Additionally, AppLocker rules can be assigned on a per-group and per-user basis . Table 24-2 lists the differences between Software Restriction Policies and AppLocker .
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TABlE 24-2 Software Restriction Policies Compared to AppLocker
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FEATURE
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SOFTWARE RESTRICTION POlICIES
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APPlOCKER
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Conditions Rule scope Audit-only mode Automatically generate rules Policy import and export Windows PowerShell support Custom error messages
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Hash, path, certificate, registry path, and Internet zone All users No No No No No
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Hash, path, and publisher All users, or specific users and groups Yes Yes Yes Yes Yes
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AppLocker is available only in Windows 7 Enterprise and Windows 7 Ultimate Editions . You can use Windows 7 Professional Edition to create AppLocker rules, but the rules will not be enforced on the computer running Windows 7 Professional . You must configure the Application Identity service to start for Windows 7 to apply AppLocker rules; by default, it is configured to start manually . The sections that follow provide more detailed information about how to configure, test, and manage AppLocker .
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appLocker Rule Types
You can create three types of AppLocker rules:
Hash rules Similar to the hash rules in Software Restriction Policies, this rule type creates a hash that uniquely identifies an executable . Before running an executable, Windows 7 calculates the hash of the file and compares it to the hash in each hash rule to determine whether the rule applies . The weakness of this rule type is that hash rules must be updated every time an executable file is updated . Therefore, every different version and every new version of an application requires its own hash rule . Path Rules Similar to the path rules in Software Restriction Policies, this rule type identifies executables based on the path . For example, you could create a path rule that allowed the executable at C:\Windows\Notepad .exe to run . This rule type allows an executable to be updated and still run, provided the path does not change .
AppLocker CHapTER 24 1143
However, a malicious user might be able to replace a legitimate executable with a different executable and run it successfully .
Publisher Rules Although certificate rules in Software Restriction Policies provide some similar capabilities, publisher rules are more sophisticated because they allow you to create a rule for different combinations of the publisher, product name, file name, and version . Because this metadata is part of the cryptographic calculations used to create the digital signature, the metadata cannot be modified . This rule type identifies executables based on the digital signature and elements of the digital signature .
When creating AppLocker rules, you should always begin by creating the default rules . The default rules allow all files in the Windows folder and the Program Files folder to run, and they allow local administrators to run all programs . Because AppLocker blocks all applications that are not specifically allowed, not enabling the default rules would prevent Windows from running normally . Use Group Policy settings to configure AppLocker rules . AppLocker is configured using the Computer Configuration\Windows Settings\Security Settings\Application Control Policies\ AppLocker node . Within the AppLocker node, there are subnodes to configure Executable Rules, Windows Installer Rules, and Script Rules . To create the default rules, right-click each subnode within the AppLocker node in the Group Policy Editor and then click Create Default Rules . The easiest way to generate rules for existing applications is to configure a Windows 7 reference computer with applications required by your organization . Start the Group Policy Editor on that computer (connecting to the domain using the Remote Server Administration Tools, available from the Microsoft Download Center at http://www.microsoft.com/downloads/) . Then, follow these steps:
1. 2.
Right-click the Executable Rules node and click Automatically Generate Rules . The Automatically Generate Executable Rules page appears . On the Folder And Permissions page, as shown in Figure 24-10, select the folder containing the executable files and the group to which the rules will apply, and assign a name to the rule . Then click Next . On the Rule Preferences page (as shown in Figure 24-11), you typically can leave the default settings selected . The default settings create publisher rules for files that are digitally signed, because a digital signature is required for publisher rules . For files that are not digitally signed, the wizard generates hash rules that allow only the specific executable to run . Alternatively, you can choose to use less-secure path rules for files that do not have digital signatures, or you can choose to create hash rules for everything . Click Next . On the Review Rules page, click Create .
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