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Preventing Roundtrip Engineering via Strong Naming
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As you may know, a strong name is based in part on two mathematically related keys (the public key and the private key), which are generated using a command line utility named sn.exe (strong name). Like most command line tools, sn.exe has a great number of options; however, if you re simply interested in generating a new key pair, the k flag is all you require: sn k mykeypair.snk
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CHAPTER 5 .NET 2.0 SECURITY
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Once you have generated a *.snk file, you should regard its contents as extremely sensitive. Given that the whole point of a strong name is to establish your identity in the .NET universe, if another (possibly evil) individual were to gain access to your key information, they could pretend to be you. Assuming this is not the case, you are now able to inform the C# compiler where to find your *.snk file via the /keyfile option. csc /keyfile:mykeypair.snk /t:library *.cs By doing so, your assembly will now be assigned a strong name. Formally speaking, the C# compiler will use data within the supplied *.snk file as so: The full public key is recorded in the assembly s manifest. A digital signature is created based on the private key and a hash code generated using the assembly contents (CIL code / metadata). This digital signature is encrypted into the assembly. Figure 5-3 illustrates the process. (Do recall that a single *snk file contains both the public key and private key data.)
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Figure 5-3. Key pairs are used to generate a digitial signature for a given assembly Now, assume you have deployed your strongly named assembly to an end user s machine. If an evildoer were to attempt a round trip, she would not have access to your key pair data. Even if this individual specified a new *.snk during compilation process, an entirely new digital signature is produced. In fact, the .NET runtime automatically verifies an assembly s digital signature (provided it has been strongly named) using the following sequence of events: 1. The embedded digital signature is decrypted using the public key. 2. The current assembly s hash is recomputed.
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CHAPTER 5 .NET 2.0 SECURITY
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3. If the hash values match, the CLR knows the assembly has not been tampered with after deployment. 4. If the hash codes do not match, the CLR refuses to load the binary and throws a FileLoadException. Figure 5-4 illustrates the process.
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Figure 5-4. The validity of a digitial signature is recomputed at load time Finally, it s important to note that strong names do not prevent evildoers from loading your assembly into ildasm.exe for the purposes of viewing proprietary code. If you wish to limit an evildoer s ability to do so, you ll want to make use of obfuscation software. As you may know, obfuscators essentially scramble the contents of a .NET assembly in such a way that while its intended operation is persevered, the internal CIL code is rendered essentially unreadable.
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Note Visual Studio 2005 ships with a community edition of Dotfuscator, which as the name implies, is an
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Encryption Services
The next security topic we ll discuss is encryption. Simply put, encryption is the process of keeping sensitive information safe and sound. More formally, encryption is used to ensure that message data (such as a social security number, bank account ID, or user password) cannot be altered and/or understood by evildoers. From a high level, encryption addresses the following security issues:
CHAPTER 5 .NET 2.0 SECURITY
Integrity: If the message has been intercepted and modified during transport, the receiver should detect it. You ensure this using a cryptographic hash code. Confidentiality: The message data shouldn t be directly readable if it s intercepted by prying eyes. You accomplish this using encryption and decryption techniques. Authentication: The receiver of the message should be able to ensure the message came from the anticipated sender. You achieve this using digital signatures. Although each flavor of encryption addresses a specific need (integrity, confidentially, and authentication), the programming model used to work with hash codes, encryption services, and digital signatures is more or less identical. Given this fact, we ll limit this part of our security overview to the role of hash codes.
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