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and password entered by the user were valid. The following example demonstrates this, and it assumes that you have written a function MyAuthenticate that connects to a SQL Server database and reads the corresponding user entry. It returns true if the entered user name and password match the ones stored in the database. protected void LoginAction_Click(object sender, EventArgs e) { Page.Validate(); if (!Page.IsValid) return; if (this.MyAuthenticate(UsernameText.Text, PasswordText.Text)) { FormsAuthentication.RedirectFromLoginPage(UsernameText.Text, false); } else { LegendStatus.Text = "Invalid username or password!"; } } Fortunately, ASP.NET 2.0 provides a ready-to-use infrastructure as well as a complete set of security-related controls that do this for you. The Membership API includes a SQL Server based data store for storing users and roles and functions for validating user names and passwords against users of this store without knowing any details about the underlying database, as you will learn in 21. Furthermore, this infrastructure is completely extensible through custom providers, as you will learn in 26.

Forms authentication is a ticket-based (also called token-based) system. This means when users log in, they receive a ticket with basic user information. This information is stored in an encrypted cookie that s attached to the response so it s automatically submitted on each subsequent request. When a user requests an ASP.NET page that is not available for anonymous users, the ASP.NET runtime verifies whether the forms authentication ticket is available. If it s not available, ASP .NET automatically redirects the user to a login page. At that moment, it s your turn. You have to create this login page and validate the credentials within this login page. If the user is successfully validated, you just tell the ASP.NET infrastructure about the success (by calling a method of the FormsAuthentication class), and the runtime automatically sets the authentication cookie (which actually contains the ticket) and redirects the user to the originally requested page. With this request, the runtime detects that the authentication cookie with the ticket is available and grants access to the page. You can see this process in Figure 20-1.

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would become something like this: SELECT * FROM Customers WHERE CustomerID = @CustID The placeholders are then added separately and automatically encoded. The syntax for parameterized commands differs slightly for different providers. With the SQL Server provider, parameterized commands use named placeholders (with unique names). With the OLE DB provider, each hard-coded value is replaced with a question mark. In either case, you need to supply a Parameter object for each parameter, which you insert into the Command.Parameters collection. With the OLE DB provider, you must make sure you add the parameters in the same order that they appear in the SQL string. This isn t a requirement with the SQL Server provider, because the parameters are matched to the placeholders based on their names. The following example rewrites the query to remove the possibility of a SQL injection attack: Dim connectionString As String = WebConfigurationManager.ConnectionStrings("Northwind").ConnectionString Dim con As New SqlConnection(connectionString) Dim sql As String = "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 = @CustID " & _ & "GROUP BY Orders.OrderID, Orders.CustomerID" Private cmd As SqlCommand = New SqlCommand(sql, con) cmd.Parameters.Add("@CustID", txtID.Text) con.Open() Dim reader As SqlDataReader = cmd.ExecuteReader() GridView1.DataSource = reader GridView1.DataBind() reader.Close() con.Close() If you try to perform the SQL injection attack against this revised version of the page, you ll find it returns no records. That s because no order items contain a customer ID value that equals the text string ALFKI' OR '1'='1. This is exactly the behavior you want.

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