Figure 13.25 The TestAccess.dll file has access to the c:\xml folder. in .NET

Generation qrcode in .NET Figure 13.25 The TestAccess.dll file has access to the c:\xml folder.
Figure 13.25 The TestAccess.dll file has access to the c:\xml folder.
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Figure 13.26 Trying to access a file in a location that permissions have not been assigned for throws a security exception.
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Lab 13.1: Adding Forms Authentication
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In this lab, you add Forms authentication to the Customers Web site. You create a simple list of users, which are placed in the Web.config file. After Forms authentication is added, you test the application by trying to view the CustomerList.aspx page, which is only available to users who are logged into the Web site. Adding the Login Page In this section, you add a new Web page called login.aspx. 1. To start this lab, open the OrderEntrySystemSolution from Lab 12.1. 2. Right-click the OrderEntrySystemSolution in the Solution Explorer, and click Check Out. 3. Add a new Web Form, called login.aspx, to the Customers site. 4. Add a TextBox for the username and another TextBox for the password. 5. Add a CheckBox that the user can select to have the application remember the login credentials. 6. Add a logon Button and a Label for any message that is to be displayed. 7. Your login page should look like the one that is shown in Figure 13.16.
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8. Add the following code to authenticate the user and redirect the user to the page that was originally requested.
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Imports System.Web.Security Public Class login Inherits System.Web.UI.Page Protected WithEvents txtUserName As System.Web.UI.WebControls.TextBox Protected WithEvents txtPassword As _ System.Web.UI.WebControls.TextBox Protected WithEvents chkRemember As _ System.Web.UI.WebControls.CheckBox Protected WithEvents btnLogin As _ System.Web.UI.WebControls.Button Protected WithEvents lblMessage As _ System.Web.UI.WebControls.Label Private Sub btnLogin_Click( _ ByVal sender As System.Object, _ ByVal e As System.EventArgs) _ Handles btnLogin.Click If FormsAuthentication.Authenticate( _ txtUserName.Text, txtPassword.Text) Then FormsAuthentication.RedirectFromLoginPage( _ txtUserName.Text, chkRemember.Checked) Else lblMessage.Text = <b>Authentication Failure.</b> End If End Sub End Class
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Modify the Web.config File In this section, you make changes to the Web.config file to enable Forms authentication and protect the CustomerList.aspx page from being viewed by anonymous users. 1. Open the Web.config file. 2. Locate the <authentication mode= Windows > tag. Replace this tag with a tag to enable Forms authentication. Within the forms tag, add credentials for three users. Your code should look like the following:
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<authentication mode= Forms > <forms name= AuthTicket protection= All loginUrl= login.aspx path= / timeout= 20 > <credentials passwordFormat= Clear > <user name= John password= hi2u /> <user name= Mary password= hi2uAll /> <user name= Glenn password= hi2u2 /> </credentials> </forms> </authentication>
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3. Add code to authorize nonanonymous users to view the CustomerList.aspx page. Your code should look like the following. This code should be located between the </system.web> and the </configuration> tags that are at the bottom of the Web.config file.
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<location path= CustomerList.aspx > <system.web> <authorization> <deny users= /> </authorization> </system.web> </location>
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Test the Login Page To test the application s ability to force a login if someone tries to access the CustomerList.aspx page, the CustomerList page must be set as the startup page, and the project can be started. The login.aspx page should be displayed, instead of the CustomerList.aspx page. After logging in, the CustomerList.aspx page should be displayed. 1. Right-click the CustomerList.aspx page in the Solution Explorer, and click Set As Start Page. 2. Run the application. The login.aspx page should be displayed. 3. Log in with one of the accounts that you created. You should be redirected to the CustomerList.aspx page. 4. Save the Solution and check it back into Visual SourceSafe.
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Summary
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Authentication is the process of obtaining identification credentials, such as name and password, from a user and validating those credentials against an authority. Authorization is the process of determining whether a user should be granted a specific type of access to a resource. Impersonation is the process of allowing applications to execute with the identity of the client on whose behalf they are operating. Delegation is impersonation across computers. Although impersonation works fine within a machine, it fails when attempting to access resources across machines. Secure Sockets Layer (SSL) communication provides encrypted communications when private data is being sent across the network. An Identity object represents an authenticated user containing, at minimum, the name of the user and the authority that authenticated the user. A Principal object represents the security context that the code is running under. This is done by encapsulating the user s identity and the roles to which the user belongs. Code Access Security can help minimize the problem of users unintentionally executing unsafe code. Code Access Security can be used to limit the resources to which code has access.
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