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1. IIS attempts to authenticate the user. Generally, IIS allows requests from all anonymous users and automatically logs them in under the IUSR account. 2. If IIS authenticates the user successfully, it passes the request to ASP.NET with additional information about the authenticated user. ASP.NET can then use its own security services, depending on the settings in the web.config file and the page that was requested. 3. If ASP.NET authenticates the user, it allows requests to the .aspx page or .asmx web service. Your code can perform additional custom security checks (for example, manually asking for another password before allowing a specific operation). 4. When the ASP.NET code requests resources (for example, tries to open a file or connect to a database), the operating system performs its own security checks. In a live website, ASP.NET code runs under a fixed account. This account is defined in the machine.config file (if you re running IIS 5) or in IIS Manager (if you re running IIS 6 or IIS 7). As your code performs various actions, Windows checks to make sure the account has the required permissions. One important and easily missed concept is that the ASP.NET code doesn t run under the IUSR account, even if you re using anonymous user access. The reason is the IUSR account doesn t have sufficient privileges for ASP.NET code, which needs to be able to create and delete temporary files in order to manage the compilation process. Instead, the ASP.NET account is set through the machine.config file (if you re using IIS 5) or the application pool identity (under IIS 6 and IIS 7), as described in 9. When designing ASP.NET pages, you must keep this in mind and ensure your program can t be used to make dangerous modifications or delete important files.

Then, for performance reasons, they are cached by the Discussions servlet on the Oracle Collaboration Suite middle tier.

Note There is one exception to the rules set out in this section. If you enable impersonation (which is

The PARTITION BY clause can be used to divide the result set into partitions to which the ROW_NUMBER() function is applied. The application of the ROW_NUMBER() function with the PARTITION BY clause returns a sequential number for each row within a partition of a result set, starting at 1 for the first row in each partition.

described at the end of this chapter), ASP.NET runs all code under the account of an authenticated user. Impersonation is rarely used, because it forces you to grant additional permissions to all users so that ASP.NET can run properly and compile code.

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rather than being read from the directory with every subsequent access. Whenever a write operation, such as posting a message, is attempted, Discussions will revalidate its cached list of roles; but for read operations, Discussions relies on the cached information. The effect of this is that if a user s roles are adjusted while he is connected to Discussions, the changes will be immediate for posting, but changes to his read permissions will only be effective after he logs out and logs back in. Thus, if a user is given permission to access a new forum, he will not see it until he reconnects; but if he is downgraded from Writer to Reader, he will immediately get an error when he attempts to post.

To see how PARTITION BY works, open a New Query window in SQL Server Management Studio Express. Enter the following query and click Execute. You should see the results shown in Figure 4-7.

So far, this discussion assumes you re using IIS, which is what all live ASP.NET websites use. However, IIS isn t involved when you test a web application using the integrated web server in Visual Studio. Instead, the Visual Studio web server plays the same role. Conceptually, the Visual Studio web server works in the same way as the IIS web server. For example, it handles requests for different types of files (such as HTML pages and ASP.NET web forms) and passes requests on to ASP.NET when required. However, the security model is simplified. Because the Visual Studio web server is designed to be used by one person at a time the current user of the local computer it doesn t support anonymous access. Instead, every time you run the Visual Studio web server it logs you on automatically, using your current Windows identity. As a result, your web page code runs with the permissions of your Windows user account. Typically, this gives your web application code more privileges than it would have in a deployed website, where it s forced to run under a more limited account.

ASP.NET automatically provides a basic level of security by blocking requests for certain file types (such as configuration and source code files). To accomplish this, ASP.NET registers the file types with IIS but specifically assigns them to the HttpForbiddenHandler class. This class has a single role in life it denies every request it receives. ASP.NET uses this technique to block access to source code files, Visual Studio project files, and other resources. Some of the restricted file types include the following: .asax .ascx .config .vb .vbproj .cs .csproj .resx .resources To see the full list, refer to the web.config.default file in the c:\Windows\Microsoft.NET\Framework\ v2.0.50727\Config folder, and search for the text System.Web.HttpForbiddenHandler.

2 covers the architecture of the Oracle Application Server. An infrastructure instance consists of a database, an Apache web listener, and various preconfigured components that provide security and support services to middle tier instances. A middle tier instance consists of a Web Cache, an Apache web listener, and various components you configure to your own needs. An Oracle Collaboration Suite installation is an infrastructure and one or more middle

select CustomerID, TerritoryID , Row_Number() over (Partition by TerritoryID order by CustomerID) as [RowCount] from Sales.Customer Where TerritoryID in (1,2) AND CustomerID Between 1 and 75

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