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Listing 9.5 Forms Authentication
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'VB.Net If FormsAuthentication.Authenticate("jandy", "qwerty") Then FormsAuthentication.RedirectFromLoginPage("jandy", True) End If //C# if (FormsAuthentication.Authenticate("jandy", "qwerty")) { FormsAuthentication.RedirectFromLoginPage("jandy", true); }
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This function returns a Boolean value based on whether the username and password combination match what is stored in Web.Config. In this instance, our user is authenticated, so we can allow the user to view restricted pages on our site. The problem with this approach is that you have to compromise scalability and security by storing usernames and passwords (in clear text or hashes) statically in Web.Config. Though this method is extremely easy to configure, we don t recommend it because of these concerns. Identity and principal While we are on the topic of ASP.NET forms authentication, we should discuss the terms identity and principal. Identity specifies who a particular user is. In the .NET Framework, who a user is can be stored in an Identity object. A user can also be associated with one or more roles in an application. Examples of roles are Administrator, Manager, and Clerk. Roles allow you to associate a user to a particular job function, which is managed at a group level. In the .NET Framework, you can grant rights to the Principal object, which is primarily based on a user s identity or more commonly, the user s role membership. The .NET Framework defines two Identity objects: GenericIdentity and WindowsIdentity. We will be looking at the GenericIdentity object more closely because it applies directly to forms authentication. The GenericIdentity object is designed so that you can provide a custom identity for the authenticated user of your system. The WindowsIdentity object stores the identity of a user when you re using Windows authentication (through IIS). Additionally, the .NET Framework defines two Principal objects: GenericPrincipal and WindowsPrincipal. Again, as with GenericIdentity, we will focus our attention on GenericPrincipal because it applies directly to forms authentication. The GenericPrincipal object is used to resolve the groups that a user belongs to if you are using a data store, such as SQL Server, for user group administration. The WindowsPrincipal object can be used to easily determine what NT groups an authenticated user is a member of when using Windows authentication. These four objects are important to you as a developer because they provide you with a means to dig in and customize the way that you identify the users of your system. These classes are easily extensible, so you can customize them and extend their functionality. As you will see in our next example, you can show and hide things in your ASP.NET web pages based on a user s role associations. Let s take a look at an example (listing 9.6) of using these objects.
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Listing 9.6 Using GeneralIdentity and GeneralPrincipal
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'VB.Net Private roles As String Private Sub cmdLogin_Click(ByVal sender As System.Object, ByVal _ e As System.EventArgs) Handles cmdLogin.Click
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Dim LoginCount As Integer = 1 Try LoginCount = Session("LoginAttemptCount") Catch Session("LoginCount") = 1 End Try If LoginCount > 2 Then lblLoginError.Text = "Too many login attempts" cmdLogin.Enabled = False Exit Sub End If If ValidateUser(txtUsername.Text, txtPassword.Text) Then 'create the authentication ticket Dim ticket As New FormsAuthenticationTicket(1, _ txtUsername.Text, DateTime.Now, DateTime.Now.AddHours(1), _ True, roles) End If 'encrypt the ticket Dim crypt As String = FormsAuthentication.Encrypt(ticket) 'add the encrypted cookie to the 'cookies collection of the form Response.Cookies.Add(New HttpCookie( _ FormsAuthentication.FormsCookieName, crypt)) Response.Redirect( _ FormsAuthentication.GetRedirectUrl(txtUsername.Text, True)) Else Session("LoginAttemptCount") = LoginCount + 1 lblLoginError.Visible = True txtUsername.Text = "" txtPassword.Text = "" End If End Sub Private Function ValidateUser(ByVal Username As String, _ ByVal Password As String) As Boolean Dim cnString As String = ConfigurationSettings.AppSettings("cnString") Dim pUsername As New SqlParameter("@Username", _ SqlDbType.VarChar, 20) pUsername.Value = Username Dim pPassword As New SqlParameter("@Password", _ SqlDbType.VarChar, 20) pPassword.Value = Password Dim UserID As Integer = SqlHelper.ExecuteScalar(cnString, _ CommandType.StoredProcedure, "usp_VerifyUser", pUsername, pPassword) If UserID <> 0 Then 'Get the user's roles
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