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CHAPTER 5 .NET 2.0 SECURITY
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GET HEAD POST DEBUG This being said, the complete set of options supported by the <authorization> element can be understood as so: <authorization> <allow users="comma-separated list of users" roles="comma-separated list of roles" verbs="comma-separated list of verbs"/> <deny users="comma-separated list of users" roles="comma-separated list of roles" verbs="comma-separated list of verbs"/> </authorization>
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Details behind the FormsAuthentication Type
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Regardless of how you author your web.config file, the values assigned to the <authentication> and <authorization> elements will typically be consumed programmatically via the static members of FormsAuthentication. You have already seen one member from this type in use: RedirectFromLoginPage. FormsAuthentication defines other members of interest. First up, this type defines a number of read-only properties, which extract the values assigned to various attributes in the open tag of the <forms> element: public sealed class FormsAuthentication { public static string CookieDomain { get; } public static HttpCookieMode CookieMode { get; } public static bool CookiesSupported { get; } public static string DefaultUrl { get; } public static bool EnableCrossAppRedirects { get; } public static string FormsCookieName { get; } public static string FormsCookiePath { get; } public static string LoginUrl { get; } public static bool RequireSSL { get; } public static bool SlidingExpiration { get; } } Further, FormsAuthentication defines additional static members beyond RedirectFromLoginPage, a subset of which are shown in Table 5-5.
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CHAPTER 5 .NET 2.0 SECURITY
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Table 5-5. Select Members of FormsAuthentication FormsAuthentication Member Authenticate() GetRedirectUrl() HashPasswordForStoringInConfigFile() RedirectFromLoginPage() RedirectToLoginPage() SignOut()
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Meaning in Life
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Validates a username and password against credentials stored in application s *.config file. Returns the redirect URL for the original request that caused the redirect to the logon page. Produces a hash password which can be stored in a *.config file. Redirects the user to or from the specified login page. Removes the Forms authentication ticket from the browser.
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Working with the <credentials> Element
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Recall that when you re making use of Forms authentication, you have some flexibility as to where you wish to store persisted user credentials. In our first example, the assumption was made that the username and password values were stored within a given table in a specific database. However, in some cases you may wish to define valid users directly within a *.config file. Again, it s not likely you d use this approach in a large-scale public web application; however, if you had a region of your site that was to be accessed by a small group of known individuals, you might mark them using a <credentials> segment. The opening element of the <credentials> section enables you to specify how passwords are represented within the *.config file (plaintext, or via MD5/SHA1 hash algorithms). Within a <credentials> scope can then be any number of <user> elements, each of which defines a name and password element. Consider the following update to our web.config file: <configuration> <system.web> <authentication mode="Forms"> <forms loginUrl ="Logon.aspx" name ="WebEntryPoint" cookieless ="UseUri"> <credentials passwordFormat="SHA1"> <user name="atroelsen" password="27CE4CA7FBF00685AF2F617E3F5BBCAFF7B7403C" /> <user name="dselly" password="D108F80936F78DFDD333141EBC985B0233A30C7A" /> <user name="tbarnaby" password="7BDB09781A3F23885CD43177C0508B375CB1B7E9"/> </credentials> </forms> </authentication> <authorization> <deny users = " "/> </authorization> </system.web> </configuration>
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CHAPTER 5 .NET 2.0 SECURITY
With this, the Button Click event handler now makes a call to FormsAuthentication. Authenticate, rather than performing custom ADO.NET database retrieval logic. For example protected void btnSubmit_Click(object sender, EventArgs e) { // Scrape out uid and pwd. string uid = txtUserName.Text; string pwd = txtPassword.Text; // Rehash password via helper function. string hashedPwd = GetHash(pwd); // See if we have a match in the web.config file. if (FormsAuthentication.Authenticate(uid, hashedPwd)) FormsAuthentication.RedirectFromLoginPage(uid, false); else lblValidationStatus.Text = "Invalid login. Please try again."; } So, at this point you have either (a) become enlightened as to how the ASP .NET runtime performs Forms-based authentication or (b) skipped over this entire section given that you have been doing Forms authentication since the early betas of .NET 1.0. In either case, we hope the core model is solid in your mind. With this, let s now examine how ASP .NET 2.0 extends and simplifies the core architecture.
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