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CHAPTER 5 WEB SERVICES ENHANCEMENTS 3.0
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Figure 5-4. MMC console displaying the Current User and the Local Computer certificate stores 4. Expand the Personal folder of the Current User certificate store and then right-click it to select the All Tasks Import menu option. Import the sample personal information exchange file titled Client Private.pfx. The sample certificates and private keys are installed with WSE 3.0, and their default location is C:\Program Files\Microsoft WSE\v3.0\Samples\Sample Test Certificates\. Client Private.pfx is the private key that the Web service client will use to encrypt requests to the Web service. Note that you will be prompted to enter a password for the private key during the import. For the WSE 3.0 test certificates, you can locate this password in a file called readme.htm, which is located in the same folder as the test certificates. 5. Right-click again the Personal folder of the Current User certificate store and select the All Tasks Import menu option. Import the sample test certificate titled Server Public.cer. This is the public key that the client uses to digitally sign requests for the Web service. 6. Expand the Personal folder of the Local Computer certificate store and import the sample test certificate titled Server Public.cer. This is the public key that the Web service uses to decrypt the client s request. This completes the installation of the certificates. But in order to use them from within ASP.NET, you will need to adjust permission levels for the ASP .NET worker process.
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CHAPTER 5 WEB SERVICES ENHANCEMENTS 3.0
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Set ASP.NET Permissions to Use the X.509 Certificates
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WSE 3.0 ships with a useful utility called the X.509 Certificate Tool. You can use this tool for several purposes: Browse installed certificates in the Current User and Local Computer certificate stores. Set permissions on the keys in the MachineKeys folder, which provides access to Local Computer certificates. Retrieve the base64 key identifier for installed certificate keys. Figure 5-5 shows the X.509 Certificate Tool with a selected certificate, which in this case is the private key certificate for the Local Computer user.
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Figure 5-5. The WSE X.509 Certificate Tool
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CHAPTER 5 WEB SERVICES ENHANCEMENTS 3.0
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The ASP .NET worker process needs Full Control security-level access to the folder that stores the Local Computer certificates. Click the lower button in the X.509 Certificate Tool page that is labeled View Private Key File Properties to open property pages for the folder. Switch to the Security tab to display the list of users who have access to the folder. Add the account that is assigned to the ASP .NET worker process and give it Full Control permissions. By default, on Windows XP/2000 under IIS 5.0, the worker process runs under a machine account called ASP .NET. On Windows Server 2003 the worker process usually runs under the NETWORK SERVICE account. Figure 5-6 shows what the Security tab looks like once you have added the ASP .NET worker process account.
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Figure 5-6. Security settings for the folder that stores the Local Computer certificates and keys The X.509 Certificate Tool provides the base64-encoded key identifier for the certificate. You will need this identifier in the code listings in order to retrieve the correct certificate. Listing 5-7 shows you how to retrieve a certificate from the certificate store using its key identifier.
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CHAPTER 5 WEB SERVICES ENHANCEMENTS 3.0
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Listing 5-7. Retrieving a Certificate from the Local Computer Certificate Store Using Its Key Identifier using Microsoft.Web.Services3.Security.X509; private X509SecurityToken GetSigningToken() { // NOTE: If you use the WSE 3.0 sample certificates then // you should not need to change these IDs string ClientBase64KeyId = "Xt/WZcILstC8oJuMqQcxbokIGR4="; X509SecurityToken token = null; // Open the CurrentUser Certificate Store X509CertificateStore store; store = X509CertificateStore.CurrentUserStore( X509CertificateStore.MyStore ); if ( store.OpenRead() ) { X509CertificateCollection certs = store.FindCertificateByKeyIdentifier( Convert.FromBase64String( ClientBase64KeyId ) ); if (certs.Count > 0) { // Get the first certificate in the collection token = new X509SecurityToken( ((X509Certificate) certs[0]) ); } } return token; } Certificates require some effort to install and to configure, but it is well worth it. Certificates are easy to use once they are installed and you get a high level of security from asymmetric encryption compared to other methods. Asymmetric encryption does have the drawback of being more processor-intensive than other methods, so it can suffer in performance compared to other methods. But there are workarounds to this. For example, you can implement WS-Secure Conversation, which optimizes the performance of encrypted communication between a Web service and client. WS-Secure Conversation is covered in 7. Finally, you will learn a lot more about using certificates in your solutions by reading 6, which focuses on the WS-Security specification.
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