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None ASP.NET doesn t perform any authentication and authorization steps other than those that IIS has already carried out. All resources are accessed by means of the identity assigned to the ASP.NET worker process. Windows ASP.NET uses the user identity (as authenticated by IIS) to decide whether the resource is accessible. Settings in web.config let you authorize individ uals or groups of users to access the entire application or portions of it, without hav ing to write any code whatsoever. The drawback of this mode is that each user must map to a Windows account, so it works especially well only in intranets. This is the default mode in ASP.NET, but you can change it by editing the machine.config file. Forms ASP.NET redirects the first request from unauthenticated users to a cus tom .aspx login page that asks remote users for their user name and password. You author this login page, so it can have the same look and feel as other pages in the site. The code in the login page then compares the user s name and password against a list of user credentials kept in web.config or another repository (most likely a database). If your code authenticates the user, ASP.NET issues a cookie that will travel with each subsequent request so that the login form isn t shown again. Passport ASP.NET uses the centralized Passport service that Microsoft provides and that s able to authenticate users across all the sites that subscribe to this ser vice. A user can log in to one site and browse any other Passport-enabled site, without having to log in to each one. Passport is a secure authentication method because user credentials can travel on encrypted channels and makes for a great user experience.

Many of the items discussed here are not just good programming practice. If you want to submit your games to the Windows Phone Marketplace and maybe make some money from selling them, you have to make you games work in the way I describe in this chapter.

Part VI:

You must be aware of a few potential problems with <forms> settings in web.config. First, setting a path for the cookie other than / requires that all the links to pages in the reserved section for example, the NavigateUrl property in Hyperlink controls or HREF attributes in <a> tags are in the correct case because a few browsers compare paths in case-sensitive mode and don t send the cookie when they access a URL in the wrong case. A second potential problem is that you must pay attention to authentication cookies if you are in a Web farm. As I explained in the Out-of-Process Sessions Based on a Windows Service section in 26, each server validates and encrypts cookies with

27:

On the Standard toolbar, click the Zoom In or Zoom Out button. To create an information set, page 20 In the Publication Types list, click any publication type. Then in the right pane, under Customize, in the Business information list, click Create new. or

two keys whose value is stored in the <machineKey> section of the machine.config file or of the main web.config file of individual applications. By default, these keys are autogenerated and each computer uses a different key, so a server on the Web farm won t recognize an authentication cookie issued by another server. To avoid this problem, ensure that all the computers on the farm use the same validation and decryption key:

You probably noticed how the fans in your computer or console run faster when you move from the menu of a game into the game itself. This is because the hardware uses more power when it starts to do a lot of work. More work means more heat, so the cooling system needs to push this heat out of the back of the computer. If you were in the basement watching your electricity meter, you would notice that it speeds up a bit during gameplay as your console starts to use more power. Exactly the same thing happens in a phone. The more programs you run on the phone, and the more you ask them to do, the more power the phone will need. Unfortunately, your phone can t take more power from the grid. All the power for a phone has to come from a limited-capacity battery. Because of this reality, the update rate of an XNA game on the Windows Phone platform has been reduced to 30 updates a second, from the 60 updates on the Xbox 360 or Windows PC. This is actually not a problem. One reason we have faster updates in our games is to reduce the flicker that you see on large screens. Windows Phone screens are small compared to TVs, so a slower update does not affect gameplay.

<configuration> <system.web> <machineKey validationKey="0123456789abcdef0123456789abcdef0123456789abcdef" decryptionKey="fedcba9876543210fedcba9876543210fedcba9876543210 validation="SHA1 /> </system.web> </configuration>

Or you can set the protection level for the authentication cookie to None, but that would mean sending the authentication cookie in clear text. A different problem can occur when you re working with version 1.1 of the .NET Framework. The default machine.config for this version includes the IsolateApps mod ifier for the validationKey and decryptionKey attributes, as in this code:

<machineKey validationKey="AutoGenerate,IsolateApps" decryptionKey="AutoGenerate,IsolateApps validation="SHA1 />