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The WSE-enabled service examines the supplied token and validates it immediately. The default authentication provider that s included with the WSE uses Windows authentication, which means it extracts the user name and password from the SOAP header and uses it to log the user in under a Windows account. If the token doesn t map to a valid Windows account, an error message is returned to the client. However, if no token is supplied, no error occurs. It s up to you to check for this condition on the web server in order to restrict access to specific web methods. Unfortunately, the WSE isn t integrated in such a way that it can use the User object. Instead, you need to retrieve the tokens from the current context. The WSE provides a RequestSoapContext. Using the RequestSoapContext.Current property, you can retrieve an instance of the SoapContext class that represents the last received message. You can then examine the SoapContext.Security.Tokens collection.

This is primarily used to create the proper constraints in the database to enforce this condition, but it can also be used by applications For instance, a content editing application that provides detailed feedback about whether the user-entered values are valid for the model can also take this into account when making that determination The name of a date-related field, such as a or , for which this value should be unique This is essentially like , except that the constraint is limited to records that occur on the same date, according to the field referenced by this attribute This can t be enforced at the database level, so Django manages the constraint manually, as should any other applications that need to provide detailed information about whether a given object can be committed to the database.

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To simplify this task, it helps to create a private method like the one shown here. It checks that a token exists and throws an exception if it doesn t. Otherwise, it returns the user name. private string GetUsernameToken() { // Although there may be many tokens, only one of these // will be a UsernameToken. foreach (UsernameToken token in RequestSoapContext.Current.Security.Tokens) { return token.Username; } throw new SecurityException("Missing security token"); } You could call the GetUsernameToken() method at the beginning of a web method to ensure that security is in effect. Overall, this is a good approach to enforce security. However, it s important to keep its limitations in mind. First, it doesn t support hashing or encrypting the user credentials. Also, it doesn t support more advanced Windows authentication protocols such as Digest authentication and Integrated Windows authentication. That s because the authentication is implemented by the WSE extensions, not by IIS. Similarly, the client always needs to submit a password and user name. The client has no way to automatically submit the credentials of the current user, as demonstrated earlier in this chapter with the CredentialCache object. In fact, the Credentials property of the proxy is ignored completely. Fortunately, you aren t limited to the scaled-down form of Windows authentication provided by the default WSE authentication service. You can also create your own authentication logic, as described in the next section.

By creating your own authentication class, you can perform authentication against any data source, including an XML file or a database. To create your own authenticator, you simply need to create a class that derives from UsernameTokenManager and overrides the AuthenticateToken() method. In this method, your code needs to look up the user who is trying to become authenticated and return the password for that user. ASP.NET will then compare this password against the user credentials and decide whether authentication fails or succeeds. Creating this class is quite straightforward. Here s an example that simply returns hard-coded passwords for two users. This provides a quick-and-easy test, although a real-world example would probably use ADO.NET code to get the same information. public class CustomAuthenticator : UsernameTokenManager { protected override string AuthenticateToken(UsernameToken token) { string username = token.Username; if (username == "dan") return "secret"; else if (username == "jenny") return "opensesame"; else return ""; } }

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