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System.Security.Permissions System.Security.Policy System.Security.Principal System.Web.Security
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In addition to these specific namespaces, security atoms can be found lurking within XML configuration files, assembly metadata, and various development and configuration tools. While space doesn t permit a complete discussion of these aspects, we ll begin this chapter by briefly examining the following topics: The role of strongly named assemblies Encryption services Role-based security After we provide an initial overview of common .NET security technologies, in the remaining bulk of the chapter we address the details of securing ASP .NET 2.0 web applications using the types within the System.Web.Security namespace.
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Note Again, the initial part of this chapter is only intended to provide an overview of select core .NET
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security technologies. If you require a full treatment of the topics we ve just outlined (including Code Access Security), consult .NET Security by Bock et al (Apress, 2002).
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The Role of Strongly Named Assemblies
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Many .NET developers assume that the only reason to assign a strong name to a .NET assembly is to deploy it to the Global Assembly Cache (GAC) as a shared assembly. While this is one
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CHAPTER 5 .NET 2.0 SECURITY
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important aspect of strong names, it is, in fact, considered a .NET best practice to provide every assembly with a strong name given the intrinsic security boundary it provides. To understand how a strong name can provide a level of security, you must understand the concept of round trip engineering. Simply put, this term explains the process of disassembling a compiled .NET assembly into Common Intermediate Language (CIL), modifying the contents, and compiling the modified CIL into a new (identically named) binary. This process is not as esoteric as you may think. In fact, the .NET Framework 2.0 SDK ships with the very tools you need to perform a round trip: ildasm.exe (the CIL disassembler) and ilasm.exe (the CIL assembler).
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An Example of Round Tripping
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Assume you have authored the following type using C# contained in a file named MyCriticalClass.cs: using System; public class MyCriticalClass { public string GetSensitiveInformation() { return "The magic value is 9"; } } If you were to compile this code file into a .NET code library at the command line using the following command: csc /t:library *.cs you could now view the generated CIL code, type metadata, and manifest information by issuing the following command to the ildasm.exe utility (see Figure 5-1): ildasm MyCriticalClass.dll
Figure 5-1. Viewing the internal composition of a .NET assembly using ildasm.exe
CHAPTER 5 .NET 2.0 SECURITY
Given that ildasm.exe is a free tool that ships with the .NET Platform 2.0 SDK, this, obviously, means any individual is able to view the internal composition of your code libraries. Worse, using the File Dump menu option of ildasm.exe, it is possible to dump an assembly s CIL code to a local file. If you were to do so, you could open the resulting *.il file using any text editor. If an evildoer has some basic knowledge of the syntax of CIL, he or she could now alter any member to perform any evil task (scan the local hard drive for sensitive information, inject viruses, etc). Just for illustrative purposes, assume that you have updated the CIL code to change the string literal within GetSensitiveInformation to return "The magic value is FOO!" rather than the intended "The magic value is 9" (see Figure 5-2):
Figure 5-2. Modifying CIL code using notepad.exe Once an *.il file has been edited, the evildoer can recompile the CIL code into an identically named *.dll using the CIL assembler, ilasm.exe: ilasm /dll /out:MyCriticalClass.dll MyCriticalClass.il Clearly the potential of round trip engineering is unnerving if you ship your *.dll or *.exe files to an end user s machine. If an evildoer alters, recompiles, and redeploys your code base, you re the one to blame as far as the end user is concerned. Do understand that not all round trips are dangerous. This same technique can be very helpful when you need to modify an assembly you no longer have source code for, or happen to be building a sophisticated assembly for the purposes of communicating between COM and .NET. Nevertheless, the chances are good that you would like to prevent others from tampering with your compiled binaries.
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