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CHAPTER 10 ASP.NET AUTHENTICATION, AUTHORIZATION, AND SECURITY
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8. Set the cnFriends connection string property to use the dynamic configuration you used before. (Select the Dynamic Configuration property called ConnectionString, and use the button there to map the property to the key cnFriends.ConnectionString in the configuration file.) 9. Right-click the SqlDataAdapter component (adUsers) and select Generate Dataset. Select the New option button, and give it the name UserData. Click OK in the dialog box, and rename the new dataset to dsData. 10. Bind the DataGrid control to this new dataset (by setting its DataSource property to dsData). The form will look something like Figure 10-14 now.
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Figure 10-14. The User page with data components 11. Let s add the code to load the dataset and bind the grid to display the data. Add the following code to the Page_Load() method of this page: Private Sub Page_Load(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles MyBase.Load MyBase.HeaderIconImageUrl = "~/images/padlock.gif" MyBase.HeaderMessage = "Administer Users" If Not IsPostBack Then Me.adUsers.Fill(Me.dsData) Me.grdUsers.DataBind() End If End Sub
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CHAPTER 10 ASP.NET AUTHENTICATION, AUTHORIZATION, AND SECURITY
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12. Add a link to this new page in the Default.aspx page, so that administrators have easy access to it. Open the Default.aspx page, and add the following code to the bottom: <form id="Default" method="post" runat="server"> ... <p class="Normal"> <asp:placeholder id="phNav" runat="server"></asp:placeholder> </p> <p> <asp:hyperlink id="lnkUsers" runat="server" navigateurl="Admin/Users.aspx"> Users Administration Page </asp:hyperlink> </p> </form> 13. Finally, make the link visible only if the current user is an administrator. Open the code-behind page for Default.aspx and add the following code at the bottom of the method: Private Sub Page_Load(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles MyBase.Load ... ' Show the Admin link only to administrators lnkUsers.Visible = User.IsInRole("Admin") End Sub 14. Save the project, and then run it with Default.aspx as the start page.
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How It Works As you can see from step 13, the purpose of the code you added is to be able to control application behavior (in this case, showing a link) based on the current user s role, instead of the particular user name or ID. This allows you to take advantage of the benefits of the role-based approach. You re handling the AuthenticateRequest event in the Global.asax file in order to replace the default principal that s associated by Forms authentication with a custom one. This will allow you to add roles to the current user, based on the information in the database. Note that you used the application request s IsAuthenticated property, instead of the Context.User.Identity.IsAuthenticated property you ve used before: If app.Request.IsAuthenticated Then ... You had to do this because the first time the page is accessed, the Context.User property isn t initialized yet, and you would have caused an exception. To take this into account, you could have replaced the previous code with the following: If (Not (Context.User Is Nothing) AndAlso (Context.User.Identity.IsAuthenticated)) Then
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CHAPTER 10 ASP.NET AUTHENTICATION, AUTHORIZATION, AND SECURITY
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If you pass the IsAuthenticated check, it will mean that Forms authentication has already done its work, and the UserID is placed where you re used to finding it: in the Context.User.Identity.Name property. This is the work that s already achieved in the Login.aspx page, and it s what you ve been doing since 4. In the remainder of the handler, you replace the empty GenericPrincipal object that s created by the Forms authentication module with one containing the actual roles the user belongs to. So, in the Application_AuthenticateRequest() handler, you retrieve the UserID and use it to issue a database query to discover whether it corresponds to an administrator. You use ExecuteScalar(), because you expect a single Boolean value to be returned. As usual, you placed the code in a Try...Finally block to ensure the connection is always closed. The GenericPrincipal constructor receives an identity and a string array containing the roles it belongs to. You reuse the identity created by Forms authentication, which is attached to the Context.User.Identity property you have been using; you don t need to change anything about it: ppal = new GenericPrincipal(Context.User.Identity, roles) Finally, you assign the newly created principal to the Context.User property: Context.User = ppal If you go look at the diagram shown earlier in Figure 10-12, you ll notice that the next page to be processed is the page that was originally requested. So, when execution reaches your code for the page, it will have access to the new role-aware principal you attached. You use this in the Page_Load() method of the Default.aspx page to display a link to the user s administration page: lnkUsers.Visible = User.IsInRole("Admin") User is a property of the Page class that provides a shortcut to Context.User, and its IsInRole() method allows you to check whether it pertains to a specific role. Figure 10-15 shows the page when an administrator user logs in.
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