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Uses no authenticati on Windows authentication in ASP.NET is similar to Windows authentication in earlier versions of ASP. Windows authentication generally piggybacks on IIS support for authentication using the Windows user database. One addition is the use of Windows authentication in addition to specific user and role authorization, as discussed in the next section. Passport authentication uses an external user database. Computers using Passport authentication must have the Passport SDK installed. ASP.NET provides a wrapper around the Passport SDK. Forms-based authentication is commonly used for Internet applications, where it s likely that not all users will be members of a Windows domain. Although this type of authentication can be implemented using traditional ASP, ASP.NET makes forms-based authentication much easier by creating a formalized framework to support it. ASP.NET In ASP, the standard method for conducting formsDifferences based authentication is to use the Session_OnStart event handler, placed in Global.asa to redirect new sessions to a login page. This method doesn t scale well because the session state in ASP can t be maintained across a Web server farm. The formsbased authentication method provides a cleaner way to ensure that users are logged in. Note When most of the attributes within all the configuration files are specified, they are specified using camel casing, meaning that the initial letter of the attribute name is lowercase but the initial letter of embedded words are capitalized, for example loginUrl. This convention is different from some earlier public betas, in which the same attribute might have been specified using Pascal casing, resulting in LoginUrl. When forms-based authentication is specified, the <forms> subtag can be used. The <forms> tag has the attributes listed in Table 4-3.
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Table 4-3 : Attributes of the <forms> Tag Attribute loginUrl Description The URL to which unauthenticat ed users are redirected. This URL can be on the same machine or on a different machine, but if it s on a different machine, the decryptionKey attribute must be the same for both machines. decryptionKey is an attribute of the <machineKey > tag in Machine.confi g. The name of the cookie to use for authentication purposes. If more than a single application on the machine uses formsbased authentication , the cookie name should be different for each application. ASP.NET uses / as the path of the cookie. The number of minutes for expiration of the cookie. The cookie will be refreshed if half the timeout
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Table 4-3 : Attributes of the <forms> Tag Attribute Description number of minutes has elapsed an effort to reduce the number of warnings users will get about receiving cookies, if they have cookie warnings turned on. Because cookies can be refreshed, the timeout value might lose precision. Thus, you can t absolutely depend on a cookie timing out in exactly the number of seconds specified by the timeout attribute. The default value is 30. The path for cookies. Defaults to /. This attribute can be changed by specifying a value in the <forms> tag or can be changed programmatic ally. The type of cookie protection. Allowed values are Validation, Encryption, None, and All. Validation
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Table 4-3 : Attributes of the <forms> Tag Attribute Description
validates the cookie data but doesn t encrypt it. Encryption encrypts the cookie data but doesn t validate it. None does neither. All (the default) both encrypts the cookie data and validates it, detecting any alteration in transit. For all but the least important data, the default is a reasonable choice, at the cost of some performance. Note Why validate the cookie Because the cookie can be used to tie into information that shouldn t be shared, validating the cookie data and rejecting it if it has been tampered with can ensure that no one can, say, hijack another shopper s shopping cart. A simple example of forms-based authentication is shown in Listings 4-6, 4-7, and 4-8. This simple-minded example uses a hard-coded user name and password within Login.aspx, as shown in Listing 4-6. These listings also introduce a new class of user interface objects. In Listing 4-6, the button used on the screen isn t a standard HTML submit button or even a standard HTML button but rather an asp:button. We ll examine these objects in much greater detail in 5. For now, just assume that they behave as you might expect. And just take it on faith that the OnClick event causes the code in Login_Click at the top of the page to be fired. Some of the details within Login_Click in Listing 4-6 aren t important, but the call to FormsAuthentication.RedirectFromLoginPage is. The first parameter passed to this method is the name of the user, obtained from UserEmail.Value, using magic not yet described (See 5 for more information on getting values from server controls.) The second parameter, hard-coded to false here, indicates that a persistent cookie shouldn t be used. Listing 4-6 A login page for authentication sample (Login.aspx)
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