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Therefore, the validation expression looks like this: ValidationExpression="[\w| ]*" The \w character class is equivalent to [a-zA-Z_0-9], and the space afterward allows spaces in the user name The password, for example, may also contain special characters Therefore, the validation expression looks different from the previous one, as shown here: ValidationExpression='[\w| !" $%&/()=\- \*]*' Note that the single quote is used for enclosing the attribute value, because this uses the double quote as the allowed special character Furthermore, because the attribute is contained in the tag code (and therefore the HTML entity), & indicates that the ampersand (&) character is allowed in the password You can see the validation controls in action in Figure 20-3 As you can see in Figure 20-3, with validation controls in place you can stop users from entering values for the user name or password that would lead to a SQL injection attack.

In addition to using parameterized SQL queries (introduced in 7), you should always use validation controls to mitigate this type of attack in your applications..

Figure 20-3. Validation controls in action The last step for creating the login page is to write the code for validating the credentials against the values entered by the user. You have to add the necessary code to the Click event of the login button. Because the following Click event is using the credentials store of the web.config file, validation is fairly easy: protected void LoginAction_Click(object sender, EventArgs e) { Page.Validate(); if (!Page.IsValid) return; if (FormsAuthentication.Authenticate(UsernameText.Text, PasswordText.Text)) { // Create the ticket, add the cookie to the response, // and redirect to the originally requested page FormsAuthentication.RedirectFromLoginPage(UsernameText.Text, false); } else { // User name and password are not correct LegendStatus.Text = "Invalid username or password!"; } }

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Because forms authentication uses standard HTML forms for entering credentials, the user name and password are sent over the network as plain text. This is an obvious security risk anyone who intercepts the network traffic will be able to read the user names and passwords that are entered into the login form. For this reason, it is strongly recommended that you encrypt the traffic between the browser and the server using SSL (as described in 19), at least while the user is accessing the login page.

This method only attempts to add a new key to the cache, using the specified value and timeout. If the given key already exists in the cache, this method will not update the cache to the new value.

Furthermore, it s important to include the PageIsValid condition at the beginning of this procedure The reason for this is that validation controls by default use JavaScript for client-side validation When calling PageValidate(), the validation takes place on the server This is important for browsers that either have JavaScript turned off or don t support it Therefore, if you don t include this part, validation will not happen if the browser doesn t support JavaScript or doesn t have JavaScript enabled So, you should always include server-side validation in your code The FormsAuthentication class provides two methods that are used in this example The Authenticate() method checks the specified user name and password against those stored in the webconfig file and returns a Boolean value indicating whether a match was found.

Remember that the methods of FormsAuthentication are static, so you do not need to create an instance of FormsAuthentication to use them you simply access them through the name of the class if (FormsAuthenticationAuthenticate(UsernameTextText, PasswordTextText)) If a match is found for the supplied credentials, you can use the RedirectFromLoginPage() method, as shown here: FormsAuthenticationRedirectFromLoginPage(UsernameTextText, false); This method performs several tasks at once: 1 It creates an authentication ticket for the user 2 It encrypts the information from the authentication ticket 3 It creates a cookie to persist the encrypted ticket information 4 It adds the cookie to the HTTP response, sending it to the client 5 It redirects the user to the originally requested page (which is contained in the query string parameter of the login page request s URL) The second parameter of RedirectFromLoginPage() indicates whether a persistent cookie should be created.

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