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This chapter provides a wide variety of recipes that cover some of the more commonly used security capabilities provided by the .NET Framework. As you read the recipes in this chapter and think about how to apply the techniques to your own code, keep in mind that individual security features are rarely effective when implemented in isolation. In particular, cryptography does not equal security; the use of cryptography is merely one small element of creating a secure solution. The recipes in this chapter describe how to do the following: Develop strong-named assemblies that can still be called by partially trusted code (recipe 11-1) Configure the .NET Framework security policy to turn off CAS completely or turn off only execution permission checks (recipes 11-2 and 11-3) Request specific code access permissions for your assemblies, determine at runtime what permissions the current assembly has, and inspect third-party assemblies to determine what permissions they need in order to run correctly (recipes 11-4, 11-5, 11-6, and 11-7) Control inheritance and member overrides using CAS (recipe 11-8) Inspect the evidence presented by an assembly to the runtime when the assembly is loaded (recipe 11-9) Integrate with Windows security to determine if a user is a member of a specific Windows group, restrict which users can execute your code, and impersonate other Windows users (recipes 11-10, 11-11, and 11-12) Generate random numbers that are nondeterministic and are suitable for use in securitysensitive applications (recipe 11-13) Use hash codes and keyed hash codes to store user passwords and determine if files have changed (recipes 11-14, 11-15, 11-16, and 11-17) Use encryption to protect sensitive data both in memory and when it is stored to disk (recipes 11-18 and 11-19)

Output 1000.0 8.0 1100.0 16.0 As you see in the output of this example, the variable area is a multiplication of x, y, and z across all instances of Cube, so there is no need to define it once per each instance. Changing the x, y, z values of the cube would automatically recalculate the value of area for the respective instance of the class. What we have seen here is an attribute-level binding within the class or instance. However, this would not be possible in certain cases, such as when the respective attribute is a public-init attribute. Such objects are described as immutable, and public-init attributes can only be initialized once and cannot be bound or assigned. Binding would still be possible in such cases, but in that case the entire object has to be bound . Let's see how this works; Listing 9-17 shows the code. Listing 9-17. Binding immutable objects class MyCircle { public-init var centerX: Number; public-init var centerY: Number; var radius: Number; init { println("Init Called"); } override function toString() { "centerX: {centerX}, centerY: {centerY}, radius: {radius}"; } } var cx = 100.0; var cy = 100.0; var r = 50.0; var circleObj = bind MyCircle { centerX: cx centerY: cy radius: r } println(circleObj); cx = 200; println(circleObj); cy = 200; println(circleObj); r = 30; println(circleObj);

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For a broader explanation of secure programming and where cryptography fits in the overall security landscape, read Writing Secure Code, Second Edition, by Michael Howard and David LeBlanc (Microsoft Press, 2003), a modern classic of computer literature that contains a wealth of practical field-tested information. For more comprehensive coverage of the .NET security classes, see Programming .NET Security by Adam Freeman and Allen Jones (O Reilly and Associates, 2003). Although not yet updated for .NET Framework 2.0, Programming .NET Security provides easily understood descriptions of security fundamentals, covers all the .NET security classes in detail, and demonstrates how to extend most aspects of the security framework.

Figure 10-56. Office Live renders the HTML you add using an HTML module. Follow these steps to edit your HTML markup: 1. Right-click on the HTML module in Page Editor. The pop-up menu shown in Figure 10-57 appears.

You need to write a shared assembly that is accessible to partially trusted code. (By default, the runtime does not allow partially trusted code to access the types and members contained in a strong-named assembly.)

Output Init Called centerX: 100.0, Init Called centerX: 200.0, Init Called centerX: 200.0, Init Called centerX: 200.0,

Apply the assembly-level attribute System.Security.AllowPartiallyTrustedCallersAttribute to your shared assembly.

2. Choose Properties on the pop-up menu. 3. The HTML -- Webpage Dialog, as shown in Figure 10-58, pops up. Notice that the formatting of the mark is different from what you entered initially. That s a nuisance, but you have to live with it.

To minimize the security risks posed by malicious code, the runtime does not allow assemblies granted only partial trust to access strong-named assemblies This restriction dramatically reduces the opportunity for malicious code to attack your system, but the reasoning behind such a heavyhanded approach requires some explanation Assemblies that contain important functionality that is shared between multiple applications are usually strong-named and often installed in the global assembly cache (GAC) This is particularly true of the assemblies that constitute the NET Framework class library Other strong-named assemblies from well-known and widely distributed products will also be in the GAC and accessible to managed applications The high chance that certain assemblies will be present in the GAC, their easy accessibility, and their importance to many different applications makes strong-named assemblies the most likely target for any type of subversive activity by malicious managed code.

centerY: 100.0, radius: 50.0 centerY: 100.0, radius: 50.0 centerY: 200.0, radius: 50.0 centerY: 200.0, radius: 30.0

Figure 10-58. The HTML editor forgets the formatting. 4. Make changes to your markup, and click OK to return to Page Editor.

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