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Note the URL displayed in the address bar. The query string embeds in the ReturnUrl variable the originally requested page. Let s review the source code associated with the click event of the form button:
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void Logon_Click(object sender, EventArgs e) { bool bAuthenticated = false; string user = userName.Text; string pswd = passWord.Text; // Custom authentication bAuthenticated = ValidateUser(user, pswd); if (bAuthenticated) FormsAuthentication.RedirectFromLoginPage(user, false); else errorMsg.Text = Sorry, yours seems not to be a valid account."; } bool ValidateUser(string user, string pswd) { // TODO:: something useful here return true; }
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A custom function takes the credentials and validates them against a userdefined data store typically a SQL Server database. The AuthenticateUser function returns a Boolean value, which tells the code whether to display an error message or just redirect to the originally requested page. In ASP.NET 2.0, RedirectFromLoginPage has three overloads:
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public void RedirectFromLoginPage(String, Boolean) public void RedirectFromLoginPage(String, Boolean, String) public void RedirectFromLoginPage(String, Boolean, String, String)
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The first argument is the name of the user. The Boolean argument indicates whether a persistent cookie must be created. Note, though, that persistent cookies aren t a good idea when the user logs on from a shared computer you should at least give her a choice between create a temporary or persistent cookie. The third argument, when requested, indicates the cookie path; the fourth specifies the authentication type cookied or cookieless. Figure 10-2 shows the main application s page when a registered and authenticated user is being served. The name of the user is displayed in the topmost bar along with a button for logging off.
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10
ASP.NET Security
Figure 10-2 The page of the application when a registered user is connected
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Anonymous Identification
Anonymous identification is an optional new ASP.NET 2.0 feature that assigns an identity to users who are not authenticated. This feature does not affect the identity of the account that processes the request, nor does it affect any other aspects of user identification and authorization. When enabled, anonymous user identification merely assigns a unique identity to a nonauthenticated user so she looks like a regularly authenticated user. This feature allows you to track the user or assign personalization properties. Functionally, anonymous identification relates to personalization only and doesn t modify any other aspect of the membership subsystem. The unique ID is not customizable by programmers. The anonymous user s ID is stored in a cookie, much like a Forms authentication ticket is stored. But the membership system doesn t consider an anonymous user to be logged in. If the user s browser doesn t accept cookies, the anonymous identification can be embedded in the URL of requested pages. If an anonymous user logs in, the anonymous identification information is discarded and the user is treated as an authenticated user. As you saw in 4, when this happens the user s personalization values can be migrated to the new identity and retained as part of the user identity. The anonymous ID is generated by an HTTP module and stored in a cookie. The behavior of the module and the properties of the cookie are determined by the following configuration setting:
<anonymousIdentification enabled="true|false />
The module fires a couple of events Remove and Create when the anonymous ID is removed and created, respectively.
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Part III
Application Services
The name of the connected user can be retrieved using the User object from the HTTP context. The following expression returns the username:
string name = HttpContext.Current.User.Identity.Name;
Here the logoff button is a plain submit button. However, you can create both the name of the user and the logoff button by using some new facility controls in ASP.NET 2.0. We ll cover them in detail later in the chapter.
Managing Membership and Roles
In ASP.NET 1.x, you must write the code that validates the user credentials against a data store typically a database. In many cases, this is boilerplate code that you must write repeatedly. The new Membership class in ASP.NET 2.0 saves you from this repetitive task. Not only does it reduce the amount of code needed to authenticate a user, but it also supplies a built-in infrastructure for managing roles. Using the features of the membership subsystem, you can rewrite the code that authenticates a user as follows:
void Logon_Click(Object sender, EventArgs e) { string user = userName.Text; string pswd = passWord.Text; if (Membership.ValidateUser(user, pswd)) FormsAuthentication.RedirectFromLoginPage(user, false); else errorMsg.Text = Sorry, that s not it."; }
This code doesn t look much different from what you would write for an ASP.NET 1.x application, but there s one big difference: the use of the ValidateUser built-in function. As long as you hold, or can obtain, the right data provider, that function call does the authenticating. Earlier in the chapter, you saw a sample function named ValidateUser written and used for the same purpose; I left it codeless for simplicity. The Membership class s ValidateUser function does the same thing, but for real this time as long as you configure the users data store.
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