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You ve probably noticed that this identity class doesn t implement IIdentity. That s because this approach doesn t allow you to plug into the .NET security model in the same way you could with custom web-page authentication. Essentially, the problem is that you need to perform the authentication after the User object has already been created. And you can t get around this problem using the global.asax class, because the application event handlers won t have access to the web method parameters and SOAP header you need in order to perform the authentication and authorization.

Once you have the user identity class, you need to create a SOAP header. This header tracks a single piece of information the user ticket. Because the ticket is a randomly generated GUID, it s not practically possible for a malicious user to guess what ticket value another user has been issued. public class TicketHeader : SoapHeader { public string Ticket; public TicketHeader(string ticket) { Ticket = ticket; } public TicketHeader() {} }

You must then add a member variable for the TicketHeader to your web service: public class SoapSecurityService : WebService { public TicketHeader Ticket; ... }

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The next step is to create a dedicated web method that logs the user in The user needs to submit user credentials to this method (such as a login and password) Then, the method will retrieve the user information, create the TicketIdentity object, and issue the ticket In this example, a Login() web method checks the user credentials using the static MembershipValidateUser() method A new ticket is constructed with the user information and stored in a user-specific slot in the Application collection At the same time, a new SOAP header is issued with the ticket so that the user can access other methods Here s the complete code for the Login() method: [WebMethod()] [SoapHeader("Ticket", Direction = SoapHeaderDirectionOut)] public void Login(string userName, string password) { if (MembershipValidateUser(username, password)) { // Create a new ticket TicketIdentity ticket = new TicketIdentity(username); // Add this ticket to Application state Application[ticket.

One important thing to keep in mind is that Django needs an object to use as a reference for the application. A Django application is essentially a standard Python package, which is just a collection of modules contained in a single folder. While Python provides an object to use as a reference for individual modules, it doesn t offer anything to refer to a package. Because of this, the closest notion Django can have to an application object is the module that Python uses to recognize it as a package. In that case, Django would be using a module object as an application reference.

Ticket] = ticket; // Create the SOAP header Ticket = new TicketHeader(ticketTicket); } else { throw new SecurityException("Invalid credentials"); } } Note that in this example, the TicketIdentity object is stored in the Application collection, which is global to all users However, you don t need to worry about one user s ticket overwriting another That s because the tickets are indexed using the GUID Every user has a separate ticket GUID and hence a separate slot in the Application collection The Application collection has certain limitations, including no support for web farms and poor scalability to large numbers of users The tickets will also be lost if the web application restarts To improve this solution, you could store the information in two places: in the Cache object and in a back-end database.

That way, your code can check the Cache first, and if a matching TicketIdentity is found, no database call is required But if the TicketIdentity isn t present, the information can still be retrieved from the database It s important to understand that this enhancement still uses the same SOAP header with the ticket and the same TicketIdentity object The only difference is how the TicketIdentity is stored and retrieved between requests..

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