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Depending on information related to your identity, you are either granted or denied access to the resources you request The conference example is a case of role-based authorization authorization being based on the role or group the user belongs to, not on who the user is In other words, you are authorized to enter the room for the keynote address based on the role (type of pass), not your specific identity information (first and last name) In many cases, role-based authorization is preferable because it s much easier to implement If the staff member needed to consult a list with the name of each allowed guest, the process of authorization would be much more awkward The same is true in a web application, although the roles are more likely to be managers, administrators, guests, salespeople, clients, and so on.

With ASP.NET, programmers finally have a comprehensive, full-featured set of security tools. As with many other features in the world of ASP.NET, the presence of a security framework simply means that there is less work for you to do to implement a variety of authentication and authorization scenarios. ASP.NET provides three types of authentication providers, including Windows authentication, forms authentication, and Passport authentication. Additionally, ASP.NET also includes all the necessary interfaces and classes you need to build your own authentication and authorization system. In the following chapters, you ll learn about all of these features.

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con.Open() Dim reader As SqlDataReader = cmd.ExecuteReader() GridView1.DataSource = reader GridView1.DataBind() reader.Close() con.Close() In this example, a user might try to tamper with the SQL statement. Often, the first goal of such an attack is to receive an error message. If the error isn t handled properly and the low-level information is exposed to the attacker, that information can be used to launch a more sophisticated attack. For example, imagine what happens if the user enters the following text into the text box: ALFKI' OR '1'='1 Now consider the complete SQL statement that this creates: SELECT Orders.CustomerID, Orders.OrderID, COUNT(UnitPrice) AS Items, SUM(UnitPrice * Quantity) AS Total FROM Orders INNER JOIN [Order Details] ON Orders.OrderID = [Order Details].OrderID WHERE Orders.CustomerID = 'ALFKI' OR '1'='1' GROUP BY Orders.OrderID, Orders.CustomerID This statement returns all the order records. Even if the order wasn t created by ALFKI, it s still true that 1=1 for every row. The result is that instead of seeing the specific information for the current customer, all the information is exposed to the attacker, as shown in Figure 7-6. If the information shown on the screen is sensitive, such as Social Security numbers, dates of birth, or credit card information, this could be an enormous problem! In fact, simple SQL injection attacks exactly like this are often the source of problems that affect major e-commerce companies. Often, the vulnerability doesn t occur in a text box but appears in the query string (which can be used to pass a database value such as a unique ID from a list page to a details page).

In a web application, different types of authorization happen at different levels For example, at the topmost level, your code can examine the user identity and decide whether to continue with a given operation On a lower level, you can configure ASP NET to deny access to specific web pages or directories for certain users or roles At an even lower level, when your code performs various tasks such as connecting to a database, opening a file, writing to an event log, and so on, the Windows operating system checks the permissions of the Windows account that s executing the code In most situations, you won t rely on this bottommost level, because your code will always run under a fixed account In IIS 5x, this is the account named ASPNET In IIS 60, this is the fixed Network Service account.

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