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Windows authentication configures IIS to validate the credentials of the user against a Windows account configured either on the local machine or within the domain When working within a domain, domain users don t need to enter their user name and password if already logged onto a client machine within the network, because the client s authentication ticket is passed to the server for authentication automatically IIS also supports Basic authentication This is an authentication method developed by the W3C that defines an additional HTTP header for transmitting user names and passwords across the wire But pay attention: nothing is encrypted The information will be transmitted Base64 encoded Therefore, you should only use Basic authentication with SSL As is the case with Windows authentication, the credentials entered by the user are evaluated against a Windows account But the way the credentials are transferred over the wire is different.

Forms authentication uses standard HTML as its user interface, so all browsers can handle it. Because you can format the login form in any way you like, you can even use forms authentication with browsers that do not use HTML, such as those on mobile devices. To do this, you need to detect the browser being used and provide a form in the correct format for the device (such as WML for mobile phones).

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By default, persistent cookies do not expire unless the FormsAuthenticationSignOut() method is used Persistent cookies are not affected by the timeout attribute that is set in the <forms> element of the webconfig file If you want the persistent cookie to eventually expire sometime in the future, you have to use the GetAuthCookie() method of FormsAuthentication, set the expiry date and time, and then write the cookie to the HTTP response yourself The following example rewrites the code that authenticates the user when the login button is clicked It creates a persistent cookie but performs additional steps to limit the cookie s life span to ten days: Protected Sub LoginAction_Click(ByVal sender As Object, ByVal e As EventArgs) PageValidate() If (Not PageIsValid) Then Exit Sub End If If FormsAuthenticationAuthenticate(UsernameTextText, PasswordTextText) Then ' Create the authentication cookie Dim AuthCookie As HttpCookie AuthCookie = FormsAuthenticationGetAuthCookie(UsernameText.

While Basic authentication transmits the information through the HTTP header, Windows authentication uses either NTLM or Kerberos for transmitting the information..

Caution Forms authentication uses standard HTML forms for collecting and submitting the user s credentials. Therefore, you have to use SSL to encrypt and transmit the user s credentials securely. If you don t use SSL, the information is transmitted as clear text in the postback data in the request to the server.

Text, True) AuthCookieExpires = DateTimeNowAddDays(10) ' Add the cookie to the response ResponseCookiesAdd(AuthCookie) ' Redirect to the originally requested page ResponseRedirect( FormsAuthenticationGetRedirectUrl(UsernameTextText, True)) Else ' User name and password are not correct LegendStatusText = "Invalid username or password!" End If End Sub The code for checking the credentials is the same in this scenario The only difference is that the authentication cookie isn t added automatically Instead, it s created with a call to GetAuthCookie(), which returns a new instance of HttpCookie, as shown here: Dim AuthCookie As HttpCookie AuthCookie = FormsAuthenticationGetAuthCookie(UsernameTextText, True) Once you ve created the authentication cookie, you can retrieve the current date and time (using the DateTimeNow static property), add ten days to it (using the DateTimeAddDays() method), and use this value as the expiry date and time of the cookie: AuthCookie.

Figure 19-4. IIS authentication options Digest authentication is similar to Basic authentication. Instead of sending the credentials Base64 encoded across the wire, it hashes the user s password and transmits the hashed version across the wire. Although this sounds more secure, Digest authentication has never become common. As a result, it s rarely used outside of controlled environments (such as intranets). Passport authentication uses Microsoft Passport as its underlying infrastructure. Microsoft Passport implements a central identity management. In that case, the user s credentials are managed by a separate Passport server. While usually this infrastructure is hosted by Microsoft, you can also host your own Passport infrastructure within your company and use that instead. Finally, IIS supports one additional authentication method, certificate authentication, that cannot be found in Figure 19-3, as it is configured through SSL.

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