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CHAPTER 6 SECURE WEB SERVICES WITH WS-SECURITY
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5. Click Next in the wizard s welcome screen. The first decision is to choose whether you want to secure a client or a service application. In this case, you are securing a service application. The second question prompts you to choose a client authentication method. In this example, you want to secure your service using a username and password. As you can see, there are other options available that resemble the different security turnkey assertions described previously. For the current example, choose the Username radio button and click Next. 6. Leave the Perform Authorization box unchecked and click Next. We will discuss authorization in the Authorization section later in this chapter. In this first example you will not perform authorization checks. This means that you will not make an additional security check to verify if a user is authorized to execute a particular task. You will assume that once a user is authenticated they can access the operations provided by the service. 7. The username and password will help the service authenticate the user, but we still need to define a way to encrypt the information that will be sent in the message. The current step in the wizard allows you to choose the level of protection by providing the following options: None: This option relies on transport level protection; for example, this can be used if the communication channel will be secured using SSL. Sign: This option signs the message. In other words, a hash is created that can be used to determine whether the message was tampered with while in transit. Sign and Encrypt: This option signs the message and its contents are encrypted. Even if a nonauthorized user has access to the message, they won t be able to read its contents. Sign, Encrypt, and Encrypt Signature: This option signs the message and both the signature and the message itself are encrypted. This is the most secure option, but it also incurs additional overhead. For this sample, choose Sign and Encrypt. Also, uncheck the Secure Session box, a feature that is discussed in 7. 8. The wizard will now show a screen where you can choose the X.509 certificate for encryption and signing. Select the WSE2QuickStartServer certificate and click Next. 9. The last step of the wizard shows you a summary of the decisions that you made. The name of the assertion is located in the second row of the summary pane. The questions asked by this security wizard will vary significantly, depending on the approach that you want to follow to secure your messages. However, at the end of the wizard you will notice that your decisions can be summarized as one of the six turnkey scenarios defined by Microsoft, as shown in Figure 6-7.
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CHAPTER 6 SECURE WEB SERVICES WITH WS-SECURITY
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Figure 6-7. Summary of the policy defined using the WSE Security Settings Wizard The wizard will generate a new file in the root directory of your project. The name of the file is wse3policyCache.config and it contains the definition of the policy that you just created. Listing 6-6 shows the policy file generated based on the options you chose in the WSE Security Settings Wizard. Listing 6-6. Policy File Generated by the WSE Security Settings Wizard <policies xmlns="http://schemas.microsoft.com/wse/2005/06/policy"> <extensions> <extension name="usernameForCertificateSecurity" type="Microsoft.Web.Services3.Design.UsernameForCertificateAssertion, Microsoft.Web.Services3, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" /> <extension name="x509" type="Microsoft.Web.Services3.Design.X509TokenProvider, Microsoft.Web.Services3, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" /> <extension name="requireActionHeader" type="Microsoft.Web.Services3.Design.RequireActionHeaderAssertion, Microsoft.Web.Services3, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" /> </extensions>
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CHAPTER 6 SECURE WEB SERVICES WITH WS-SECURITY
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<policy name="UsernamePolicy"> <usernameForCertificateSecurity establishSecurityContext="false" renewExpiredSecurityContext="true" requireSignatureConfirmation="false" messageProtectionOrder="SignBeforeEncrypt" requireDerivedKeys="true" ttlInSeconds="300"> <serviceToken> <x509 storeLocation="LocalMachine" storeName="My" findValue="CN=WSE2QuickStartServer" findType="FindBySubjectDistinguishedName" /> </serviceToken> <protection> <request signatureOptions="IncludeAddressing, IncludeTimestamp, IncludeSoapBody" encryptBody="true" /> <response signatureOptions="IncludeAddressing, IncludeTimestamp, IncludeSoapBody" encryptBody="true" /> <fault signatureOptions="IncludeAddressing, IncludeTimestamp, IncludeSoapBody" encryptBody="false" /> </protection> </usernameForCertificateSecurity> <requireActionHeader /> </policy> </policies> The web.config file is also modified by the wizard by the addition of one line that references the new policy file. That line is under the <Microsoft.web.services3> section: <policy fileName="wse3policyCache.config" />
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