Security in .NET framework

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Security
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can only read files in the directory it was loaded from or access the Web site it was executed from, and it can use an unlimited amount of isolated storage.
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Internet In the default configuration, assemblies loaded from the Internet, including the Trusted Sites zone but excluding the Untrusted Sites zone, are assigned this permission set. As you might guess, these assemblies have more restricted permissions than those coming from the local intranet. They can use up to 10 KB of isolated storage, access the Web site they were loaded from, and use the Clipboard (but only paste data copied there from the same AppDomain). They can use the printer only through a restricted printer dialog box, and can t display user interface elements, except for Open File dialog boxes and safe top-level win dows. (A safe top-level window is a Windows form whose location, size, and opacity are restricted.) Execution This permission set corresponds to the right to execute code. Assem blies associated with this permission set can execute, but they can t access any sys tem resources. This permission set isn t used in the default configuration, but it could be useful for example, for code libraries that contain only math, string, and financial functions. Nothing This permission set is empty and assemblies associated with it are prevented from executing, let alone accessing system resources. At a first glance, a Nothing permission set might seem useless, but it s actually quite handy to explic itly prevent an assembly from being loaded. In the default configuration, assem blies loaded from the Untrusted Sites zone are associated with this permission set.
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If you need to be more specific about what an assembly can and can t do, you must create a custom permission set. You can do that in the .NET configuration tool by selecting the New command from the context menu of the Permission Sets element. For example, you might define a permission set named DataReaders that specifies the right to read from C:\Data directory and its subfolders, use the default printer, and dis play user interface elements. (See Figure 33-4.) You can also create a PermissionSet object via code, as I ll explain in The PermissionSet Class section later in this chapter. CAS policy often gets in the way when you re running a Visual Studio .NET project loaded from a network drive. In this case, the compiled assembly is granted the LocalIntranet permission set, which prevents it from accessing the file system and dis covering type information through reflection. Visual Studio .NET anticipates this prob lem and displays the warning shown in Figure 33-5. The simple solution is to change the output path in the Project Properties window so that Visual Studio .NET saves the compiled assembly on a local disk.
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Part VII:
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Figure 33-4 The .NET Configuration tool lets you build a permission set that combines one or more permission objects (left) and set the individual properties of each permission object (right).
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Figure 33-5 The message that Visual Studio .NET displays when loading a solution from a network drive
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Each policy level has a tree of code group elements below it. (See the Machine policy level in Figure 33-2.) Each code group is a combination of a group of evidence objects and a permission set. The group of evidence objects determines the membership condition for the code group for example, All assemblies loaded from the local machine or All assemblies loaded from a Microsoft Web site and signed with the publisher s signature. The permission set determines which operations are allowed for the assemblies in the code group so, for example, you can define a code group that corresponds to the fol lowing security policy: All assemblies loaded from a Microsoft Web site and signed with the publisher s signature are assigned the DataReaders custom permission set. Therefore, they can read from C:\Data, display user interface elements, and use the default printer. The code groups immediately below the Enterprise and User policy levels are named All_Code; their membership condition is true for all assemblies and their permission set is FullTrust therefore, in the default configuration these policy levels don t contribute to limiting what permissions are granted to code. With the Enterprise and User policy levels out of the way, we can focus on the Machine policy level. The first code group below the Machine policy level is also named All_Code and has a membership condition that is true for all assemblies, but its permission set is Nothing.
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