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Regardless of the authentication system, ASP.NET uses the same underlying model to represent user and role information. Users who log into a web application are granted a principal and an identity based on the credentials they have provided. The principal object represents the current security context of the user. It combines the user itself (the identity) with information stored in the account records for the current user such as the roles, privileges, and much more. It therefore allows you to perform role-based authorization, and it provides a reference to the corresponding identity object. The identity object represents the successfully authenticated user and therefore provides user information such as the user name.

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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This is an important part for the validation of the password and enables you to specify strength requirements for the passwords used by your users Allows you to specify the minimum length of passwords for users of your application This is also an important property for specifying password strength properties If the previously mentioned properties are not sufficient for specifying password strength conditions, then you can use a regular expression for specifying the format of valid passwords With this option you are completely flexible in terms of specifying password format criteria The membership API contains functionality for resetting a user s password and optionally sending an e-mail if an SMTP server is configured for the application When set to True, you can retrieve the password of a MembershipUser object by calling its GetPassword method Of course, this works only if the password is not hashed.

All principal objects implement the IPrincipal interface, which defines a core set of functionality. When you access the User property of the current web page (System.Web.UI.Page) or from the current HTTP context (HttpContext.Current), you re accessing an IPrincipal object that represents the security context of the current user. The IPrincipal interface defines a single property named Identity, which retrieves an IIdentity object that provides information about the current user. The IPrincipal interface also defines a single method named IsInRole(), which allows you to test whether the current user is a member of a specific role. Here s an example that uses the IsInRole() method to test whether the current user is a member of a role named Admin: if (HttpContext.Current.User.IsInRole("Admin")) { // (Do something.) } When using Windows authentication or forms authentication, the principal object is created automatically. However, it s also possible to create a principal object on the fly, with user and role information that you extract from another location, such as a custom database. You ll see examples of both techniques in later chapters.

Persistent cookies are stored on the user s hard drive and can be reused for later visits Persistent cookies are described in the section Persistent Cookies in Forms Authentication later in this chapter Finally, if Authenticate() returns false, an error message is displayed on the page Feedback such as this is always useful However, make sure it doesn t compromise your security For example, it s all too common for developers to create login pages that provide separate error messages depending on whether the user has entered a user name that isn t recognized or a correct user name with the wrong password This is usually not a good idea If a malicious user is trying to guess a user name and password, the user s chances increase considerably if your application gives this sort of specific feedback..

Specifies the number of invalid validation attempts before the user gets locked Here you can set the number of minutes in which a maximum number of invalid password or password question-answer attempts are allowed before the user is completely locked out from the application In that case, the user gets locked out, so the administrator must activate the account again..

Like the IPrincipal interface, the IIdentity interface provides consistency no matter what authentication scheme you use. All identity objects must implement IIdentity.

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