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Because the ASP.NET infrastructure intercepts the very first call to the remote object, you can also use the Application_Start event handler in Global.asax to run any initial ization code. You can use this approach to register a configuration file with a name other than Web.config or register your server-side remotable objects programmatically.
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Let s review the simple steps for hosting the RemoteComponents.dll assembly in IIS and letting remote clients access the objects that this assembly exposes: 1. Create an appropriate configuration file for the remote objects, and save it as Web.config in a directory of your local hard disk. (IIS configuration files must have this name.) Remember that you can specify an HTTP channel but omit the port number, and you must not specify an application name. 2. Create a directory named bin as a subdirectory of the directory that contains the Web.config file; save the RemoteComponents.dll into this bin directory. Alterna tively, you can sign the assembly with a strong name and register it in the GAC. (If you do so, remember that the configuration file should refer to the assembly using its complete name, including version, culture, and publisher key.) 3. Right-click on the folder that contains the Web.config file, choose the Sharing And Security command, switch to the Web Sharing tab, and select the Share This Folder option to create an IIS virtual directory that maps to this folder. (See Figure 32-8.) Alternatively, you can create the virtual directory from inside the IIS MMC snap-in, by right-clicking the Default Web Site element and choosing the Virtual Directory command from the New submenu.
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Figure 32-8 Creating an IIS virtual directory that hosts the Web.config configuration file
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4. Locate the new virtual directory in the IIS MMC snap-in, right-click on it to display the Properties window, switch to the Directory Security tab, and click the Edit button in the Authentication And Access Control area. This action displays the Authentication Methods dialog box, where you should verify that the Enable Anonymous Access check box is selected. (See Figure 32-9.)
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Figure 32-9 You should ensure that anonymous users can access your objects. (.NET Passport authentication is available only on Windows Server 2003.)
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Here s an example of a Web.config file that you can deploy together with the RemoteComponent.dll assembly. I have used the .soap extension for the objectUri attribute of the <wellKnown> tag, which emphasizes the fact that the object will be serialized via SOAP. (You can use the .rem extension without any problem, however.)
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<configuration> <system.runtime.remoting> <application> <service> <wellknown type="RemoteComponents.Calculator, RemoteComponents mode="Singleton objectUri="Calculator.soap /> </service> </application> </system.runtime.remoting> </configuration>
Notice also that you can drop the <channels> section entirely, unless you need to spec ify a binary formatter or some other custom attribute for the HTTP default channel.
Configuring the Client Application
Very few changes are necessary in the client application to let it use a remote object hosted in IIS. In practice, assuming that the application is already configured to use the HTTP channel, the only significant change is in the URL that references the remote object. The new URL doesn t specify the port number, but it must include the name of
32:
Remoting
the virtual directory that you ve created for the object. Here s an example of the configuration file that the client can use to reach the object exposed with the Web.config file listed in the previous section:
<configuration> <system.runtime.remoting> <application> <client> <wellknown type="RemoteComponents.Calculator, RemoteComponents url="http://localhost/RemoteComponent/Calculator.soap /> </client> </application> </system.runtime.remoting> </configuration>
Implementing Security
I ve mentioned that IIS offers built-in security, in the form of one of the authentication mechanisms shown in Figure 32-9. (As you might remember from previous sections, you had to disable IIS security and accept requests from anonymous clients.) In this section, I ll show you how you can take advantage of the most common authentication mecha nisms that IIS provides: Basic authentication and Integrated Windows authentication. Enabling Integrated Windows authentication is actually quite simple, so I ll start with that. Go back to the IIS dialog box shown in Figure 32-9 and verify that only the Inte grated Windows Authentication check box is selected. If you now rerun the client, you ll see that an exception occurs. If the client machine is in the same domain or in a trusted domain, you can authenticate the client application by just adding the useDe faultCredentials attribute to the <channel> tag in the client s configuration file:
<!-- In the client configuration file --> <channels> <channel ref="http useDefaultCredentials="true /> </channels>
If the client resides outside your domain (which is the case when your objects can be reached from the Internet), you can t use Integrated Windows authentication exclu sively and must enable Basic authentication. Let s see how the client application can pass its credentials to the server:
Create an SAO object. Dim calc As New Calculator Specify username and password in the channel properties.
Dim props As IDictionary = ChannelServices.GetChannelSinkProperties(calc)
props( username ) = myusername"
props( password ) = mypassword"
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