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<script language="C#" runat=server> void Login_Click(Object sender, EventArgs E) { // Authenticate user: This sample accepts only one user with // a name of doug@programmingasp.net and a password of // password if ((UserEmail.Value == "doug@programmingasp.net") && (UserPass.Value == "password")) { FormsAuthentication.RedirectFromLoginPage( UserEmail.Value, false); } else { Msg.Text = "Invalid Credentials: Please try again"; } } </script> <body> <form runat=server> <center> <h3> <font face="Verdana" color=blue>Login Page</font> </h3> <table> <tr> <td> Email: </td> <td>
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<input id="UserEmail" type="text" runat=server size=30 /> </td> <td> <ASP:RequiredFieldValidator ControlToValidate="UserEmail" Display="Static" ErrorMessage="*" runat=server /> </td> </tr> <tr> <td> Password: </td> <td> <input id="UserPass" type=password runat=server size=30 /> </td> <td> <ASP:RequiredFieldValidator ControlToValidate="UserPass" Display="Static" ErrorMessage="*" runat=server /> </td> </tr> <tr> <td colspan=3 align="center">
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<asp:button text="Login" OnClick="Login_Click" runat=server> </asp:button> <p> <asp:Label id="Msg" ForeColor="red" Font-Name="Verdana" Font-Size="10" runat=server /> </td> </tr> </table> </center> </form> </body> </html>
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Listing 4-7 also shows a pedestrian example (well, pedestrian once you understand how all the ASP.NET form magic works and you ll learn all about that in 5). The form simply identifies the user and allows the user to log out. Listing 4-7 A restricted page for authentication sample that allows you to logout (Default.aspx)
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<script language="C#" runat=server> void Page_Load(Object Src, EventArgs E ) { Welcome.Text = "Hello, " + User.Identity.Name; }
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void Signout_Click(Object sender, EventArgs E) { FormsAuthentication.SignOut(); Response.Redirect("login.aspx"); } </script>
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<body> <h3> <font face="Verdana">Using Cookie Authentication</font> </h3> <form runat=server> <h3> <asp:label id="Welcome" runat=server /> </h3> <asp:button text="Signout" OnClick="Signout_Click" runat=server /> </form> </body> </html>
Listing 4-8 is the configuration file for this application, named Web.config. This too is a plain vanilla file. The authentication section is the part we re interested in, and it s essentially the same as the authentication tag shown earlier. Also of interest is the authorization tag, which is related to authentication as well, as described in the next section. Note This Web.config file must be at the root of the Web application directory in IIS. Also, the directory must be configured as an application directory, not a virtual directory. Listing 4-8 Configuration file for authentication sample
<configuration> <system.web> <authentication mode="Forms"> <forms name=".ASPXUSERDEMO" loginUrl="login.aspx" protection="All"
timeout="60" /> </authentication> <authorization> <deny users=" " /> </authorization> <globalization requestEncoding="UTF -8" responseEncoding="UTF -8" /> </system.web> </configuration>
There s one more possible twist to forms-based authentication. Within the <authentication> tags, a credentials section is allowed, where user and password information is allowed. For example, these lines could be added to the authentication section of the Web.config file shown in Listing 4-8. <credentials passwordFormat="Clear" > <user name="Mary" password="littlelamb"/> <user name="Jill" password="uphill"/> </credentials> The <credentials> tag has one attribute, named passwordFormat. The possible values for the passwordFormat attribute are shown in Table 4-4. Table 4-4 : Options of the passwordFormat Attribute Option Clear Description Stores passwords in clear text. This value is not at all secure, but it is convenient for testing. SHA stands for Secure Hash Algorithm. SHA1 stores passwords as SHA1 digests. SHA1 uses a 160-bit hash size. SHA1 was designed to correct a problem in the original
SHA1
Table 4-4 : Options of the passwordFormat Attribute Option Description SHA algorithm. Stores passwords as MD5 digests. MD5 produces a 128-bit fingerprint. This value is much more reliable than a traditional checksum. To validate a user name and password from the form, the form needs to call the Authenticate method of the System.Web.Security.FormsAuthentication class. The authorization Section After the system has identified a user, you might want to control whether the user is allowed to use the application. The authorization section enables you to do exactly that by using <allow> and <deny> tags, which can specify individual users, or groups of users, called roles. Using Windows authentication, as described in the previous section, will cause Windows NT groups to be mapped to roles. The <allow> and <deny> tags are searched until the first match is found for the user being authorized. If the first match is in the <allow> tag, the user is allowed; if the first match is in the <deny> tag, the user is denied. Access is denied if no matching rule is found. In general, for sites where authorization is important, a <deny users= * /> tag should be present to make the denial explicit. The customErrors Section For developers, one of the problems with ASP is a lack of clarity in error messages. ASP.NET has addressed this issue by creating far better error messages, often including not only the single line of code that triggered the error but also a couple lines before and after. This additional information is important because often an error on one line is in fact caused by an error on the previous line. Figure 4-14 shows an example ASP.NET error message. MD5
Figure 4-14 : An ASP.NET error message This error page provides a couple links at the bottom that are useful to the developer. The first is Show Detailed Compiler Output. Clicking this link shows the output that would
be seen if the command-line compiler were called directly. This output can be useful if there are warnings that occur before the error that might give clues to exactly what s happening. The second link is Show Complete Compilation Source. Clicking this link shows a detailed listing of exactly what the compiler is using to generate the page. The simple Login.aspx page shown in Listing 4-6 is expanded to over 400 lines of detailed listing as ASP.NET takes the source provided (both the code and the HTML source) and produces the code required to create the page. Understanding this code isn t essential, but it can be useful in some debugging situations. One thing you should notice about the error page is that in showing the context, it actually shows the user name and password that the login page is expecting! Of course, this example is contrived. No one would use such a security system in a real application. However, people might have other code that they d prefer users not see, such as database user names and passwords embedded in connection strings. Embedding connection strings into the application is a bad idea for lots of reasons, but in any event, preventing exposure of source code to users is always a good idea. The customErrors section of Web.config can be used to ensure that this sort of error message appears only to developers during development and testing, and not to users. The <customErrors> tag supports the attributes listed in Table 4-5.
Table 4-5 : Attributes of the <customErrors> Tag Attribute defaultRedirect Option Description Specifies a URL to redirect the user to Specifies whether custom errors are enabled, disabled, or shown only on remote clients On Specifies that custom errors are enabled Specifies that custom errors are disabled Specifies that custom errors are shown only on remote clients
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