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Once you ve installed the certificate, it s fairly easy to use SSL communication. The only other step is to modify your request to use a URL that starts with https:// instead of the http:// prefix. Typically, this means tweaking a Response.Redirect() statement in your code. Because all the encryption and decryption occurs just before the message is sent (or immediately after it is retrieved), your application does not need to worry about deciphering the data manually, manipulating byte arrays, using the proper character encoding, and so on. At the server side, you can also enforce SSL connections so that it is impossible to interact with a web service without encrypting communication. Simply right-click the website in IIS Manager, and select the Directory Security tab. In the Secure Communications section, click the Edit button (which is available only after a certificate is installed). Then, choose Require Secure Channel (see Figure 19-8).

Keep in mind that there are good reasons not to enforce an SSL connection for an entire virtual directory. For example, you might want to secure some method calls in a web service but not secure others that don t return sensitive information. This allows you to increase performance and reduce the work performed by the server. If needed, you can check for a secure connection in your code and then throw an exception or redirect the user if SSL is required but not present. Here s an example that checks whether the current request is transmitted over a secure connection using the HttpRequest.IsSecureConnection property: if (Request.IsSecureConnection) { // (Application code goes here.) } else { // Redirect with https to ensure the page is accessed over SSL. Response.Redirect("https://www.mySite.com/account.asmx"); }

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A common mistake is to use localhost or any other aliases for the server host name in an SSL connection. This will not work, because the client attempts to verify that the CN (common name) part of the subject name of the server certificate matches the host name found in the HTTP request during the handshake portion of the SSL exchange.

With SSL, all traffic will be encrypted, not just the sensitive data. For this reason, many web servers use a hardware accelerator to improve the performance of encryption with SSL.

When an application has a lot of seldom-changing information to deal with, it s often useful to cache this information on the server so it doesn t have to be generated each and every time it s accessed. This can save on memory usage on the server, processing time per request, and ultimately helps the application serve more requests in the same amount of time. There are a number of ways to access Django s caching mechanism, depending on just how much information needs to be cached. The online documentation5 covers the many general cases on how to set up site-wide caching and per-view caching, but the lower-level details merit a bit more explanation.

Remember, SSL is not tied to ASP.NET in any way. If you want to learn more about SSL, consult a book dedicated to security and IIS such as IIS Security (Osbourne/McGraw-Hill, 2002).

ASP .NET implements the concept of gatekeepers (introduced previously) through HTTP modules. Each module is a class implementing the interface IHttpModule, and each module acts as a gatekeeper of the ASP.NET infrastructure. Of course, HTTP modules are used for other tasks, but lots of them are security related. As you can see in Figure 19-9, ASP .NET includes several authentication and authorization modules. Because web applications use the stateless HTTP, no information is retained for the user between requests. As a result, the user must be authenticated and authorized at the beginning of each request. ASP.NET handles this by firing global application events. Authentication modules can handle these events to perform user authentication. Not all requests require authentication or authorization. However, the related events always fire. These events are handled by the configured HTTP modules demonstrated in Figure 19-9. Of course, you can handle the events through the global application class as well (these events are defined in the code-behind class of the Global.asax file), but for higher reusability we recommend creating separate HTTP modules, because it is really easy to create them.

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