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Reference the Security Policy from Code
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Open the StockTrader.cs file and make the following changes: 1. Add a using directive for the Microsoft.Web.Services3 namespace. 2. Add the following reflection attribute to the definition of the StockTrader class: [Policy("UsernamePolicy")].
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Implement a Custom Username Token Manager
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The default behavior of the UsernameTokenManager class is to authenticate the user against an Active Directory or a local Windows account. In this example, we are going to override the default behavior of this class by creating a custom username token manager. To accomplish this, you will need to create a new class file named UsernameTokenManager.cs, and type in the code shown in Listing 6-7.
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CHAPTER 6 SECURE WEB SERVICES WITH WS-SECURITY
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Listing 6-7. A Custom Username Token Manager using using using using System; System.Xml; Microsoft.Web.Services3.Security; Microsoft.Web.Services3.Security.Tokens;
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namespace StockTraderSecure { public class CustomUsernameTokenManager : UsernameTokenManager { public CustomUsernameTokenManager() { } public CustomUsernameTokenManager(XmlNodeList nodes) : base(nodes) { } protected override string AuthenticateToken(UsernameToken token) { // return the password, in this sample, the password is the same value // as the user name, but in upper case // In a production application, the password would be retrieved // from an external storage, such as a SQL Server database or // an LDAP directory. return token.Username.ToUpper(); } } } The previous code uses a straightforward algorithm to obtain the user s password. It simply converts the username to uppercase. If you want the user to be authenticated successfully, you will need to build a client application that passes the same value as a username and password, with the second one containing only uppercase characters. The last step is to modify the web.config file to specify the name of the user-defined class that will handle user authentication. The <securityTokenManager> section must be located under the <security> tag of the <microsoft.web.services3> section. Listing 6-8 shows a fragment of the web.config file that enables the service to use a custom security token manager.
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CHAPTER 6 SECURE WEB SERVICES WITH WS-SECURITY
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Listing 6-8. Fragment of the web.config File <securityTokenManager> <add type="StockTraderSecure.CustomUsernameTokenManager" namespace="http://docs.oasis-open.org/wss/2004/01/oasis- 200401-wss-wssecurity-secext-1.0.xsd" localName="UsernameToken" xmlns=""/> </securityTokenManager>
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Secure the Client Application
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The client application will also be secured using the WSE Security Settings Wizard. The following steps will help you define a client security policy that will comply with the rules defined by the service policy. 1. Enable the StockTraderClient project for WSE 3.0 using the WSE Settings Tool. Enable Message Tracing in the Diagnostics tab, just like you did for the StockTraderSecure project. 2. In the WSE Settings Tool, choose the Policy tab, and select the Enable Policy check box. 3. Click Add and enter the name UsernamePolicy and click OK. 4. Click Next in the WSE Security Settings Wizard welcome screen. 5. Choose the option to secure a client application, select the Username radio button, and click Next. 6. Choose to specify the username and password in code. It is not recommended to store these credentials in a configuration file. 7. Choose the option to Sign and Encrypt the messages, just like you did when you defined the policy for the service. If you choose a different encryption level, the client will not be compliant with the policy defined by the service and you will get a SOAP exception during the service call. Uncheck the Secure Session box and click Next. 8. The wizard will now show a screen where you can choose the X.509 certificate that will be used for encryption and signing. Select the WSE2QuickStartServer certificate and click Next. 9. The last step of the wizard, shown in Figure 6-8, displays the summary of the security policy that you have created for the client application. Notice that these decisions can be grouped under the same turnkey scenario as the service application.
CHAPTER 6 SECURE WEB SERVICES WITH WS-SECURITY
Figure 6-8. Summary of the security policy
Use the Proxy Class Generated by WSE
The next step is to regenerate the StockTraderProxy Web reference. Right-click it in the Solution Explorer and select the Update Web Reference command. Open the Reference.cs autogenerated file, which is located under the StockTradeProxy/ Reference.map folder. Find the definition of the StockTraderWse class and you will see that it inherits from the Microsoft.Web.Services3.WebServicesClientProtocol class. The Microsoft. Web.Services3 namespace contains the core classes that are used by the WSE toolkit. Now open the StockTraderConsole.cs class and modify it as follows: 1. Add a using directive for the Microsoft.Web.Services3.Security.Tokens namespace. 2. Modify the line that creates an instance of the Web service proxy by replacing the StockTrader class with the StockTraderWse class. 3. Create a Username Token. For sample purposes, the password value is the username in uppercase letters. The password is included as plain text in the token, which is encrypted using the X.509 certificate. 4. Append the token to the proxy. 5. Set the client policy.
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