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CHAPTER 9 CLICKONCE TOOLS AND SCENARIOS
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Figure 9-13. The software vendor ships the application to the purchaser, and the purchaser deploys the application to its internal server.
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In this scenario, the software vendor can create the deployment and application manifest files, but they will have to be modified once the deployment server and update server are known. Note that you are assuming that it is not practical for the software vendor to preconfigure the manifest files for the purchaser of the software because servers often move or have to be renamed, so the software purchaser will need to take responsibility for maintaining the manifest files. In this scenario, the software vendor can produce and distribute a ClickOnce deployable application. The software purchaser can take the ClickOnce deployment, modify the manifest files, and re-sign them using the MAGE tool.
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MAGE Scenario: ClickOnce Application Has to Delay-Sign Assemblies
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The assemblies shipped with the .NET Framework are strong-named, signed assemblies. The CLR verifies the integrity of signed assemblies prior to loading. If an assembly is tampered with, the CLR doesn t load it. Because of this, some organizations heavily guard the private key used to sign assemblies. If they didn t and someone with bad intentions obtained the private key, they could sign the assembly and perform malicious activities. For example, if someone got a hold of the private key used to sign the .NET Framework system assemblies (for example, System.dll), they could copy their own version of an assembly and do virtually whatever they liked. Because organizations heavily guard their private keys, developers don t have access to the private key. This poses the question, if the private key is not exposed to developers to sign assemblies with, how do they build strong-named assemblies Well, the .NET Framework supports the concept of delay-signing assemblies. Delay-signing assemblies allows developers to tell the CLR not to verify the integrity of an assembly. You can do this by following these steps:
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CHAPTER 9 CLICKONCE TOOLS AND SCENARIOS
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1. Use the public key to sign the assembly. The public key is usually in the form of an *.snk file. You can create this file using the signing tool, sn.exe, that ships with the .NET Framework SDK. The signing tool comes with the .NET Framework SDK and is located at %programfiles%\Microsoft Visual Studio .NET 2003\SDK\v1.1\Bin. 2. Apply the strong-named key file to the assembly by adding AssemblyKeyFileAttribute to AssemblyInfo.cs: [assembly:AssemblyKeyFileAttribute("myapp.snk")] 3. Set the delay-signing attribute to true: [assembly:AssemblyDelaySignAttribute(true)] 4. Register the assembly for verification skipping using the signing tool: sn.exe -Vr myapp.dll Delay-signing assemblies should happen only during development. The idea is to skip verification during development and then properly sign the assemblies prior to deployment. The problem with delay-signing assemblies and Visual Studio publishing is that after you do a build of your application, you have to take the generated assemblies and have them signed using the private key. If the assemblies are modified, the ClickOnce manifests (at least the application manifest) have to be re-signed, so you can t publish an application that is delaysigned using Visual Studio 2005. Instead, you ll have to use the MAGE tool or a similar tool.
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MAGE Scenario: ClickOnce Application Assemblies Need to Be Obfuscated
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Historically it has been difficult to reverse-engineer the binaries of an application to a form that can be easily understood. With languages such as Java, C#, and others, reverse-engineering has become easy. These languages are compiled to an intermediate form (Java goes to bytecode and C#, and all supported .NET languages go to MSIL), which makes them easy to decompile. More and more, organizations are looking for approaches to prevent the decompilation of their software. Preventing someone from reverse-engineering binaries (whether bytecode, MSIL, or even native machine code1 ) is nearly impossible. Because of this, organizations interested in protecting themselves against decompilation use obfuscation. Obfuscation takes the intermediate form and changes it, such that when decompiled, it becomes difficult to understand. So, what does this have to do with ClickOnce and the MAGE tool Well, if you have to obfuscate your software, you ll have to either create the ClickOnce manifest manually or edit the Visual Studio generated manifest files. The reason for this is that obfuscation is applied to the assemblies. After you compile your application, you obfuscate and then publish. Visual Studio 2005 doesn t support plugging in obfuscation to this process. As a result, after you obfuscate your assemblies, you have to re-sign manifest files created by Visual Studio. The MAGE tool can help with this.
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1. Cifuentes, Cristina, and K. John Gough. Decompilation of Binary Programs. Software: Practice and Experience (July 1995): 811 829.
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