Figure 11-3 Forms-Based Authentication in Visual Studio .NET

Generate Code 128 in Visual Studio .NET Figure 11-3 Forms-Based Authentication
Figure 11-3 Forms-Based Authentication
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Essential ASPNET with Examples in C#
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ByFritz Onion Publisher Pub Date ISBN Pages : Addison Wesley : February 11, 2003 : 0-201-76040-1 : 432
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1125 Password Storage
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"This well-conceived and well-written book has extensive knowledge and priceless experience overflowing One its pages It captures the true essence of ASPNET and walks the reader to a authentication, is that if a fromof the dangers of performing your own authentication, as is required by formshigh level of technical and hacker m stored, she can then Fred Maples, Director of Software freely, possibly at other Web sites if users established the sam architectural skill"-Juse the usernames and passwords Engineering, NASDAQcom passwords in clear text altogether and instead prefer to store MD5 or SHA1 hashes of users' passwords The FormsAu Essential ASPNET with Examples in C# is the C# programmer's definitive reference for ASPNETas shown in Listing 11 hashes on arbitrary strings with the static method HashPasswordForStoringInConfigFile , through version 11 It provides experienced programmers with the information needed to fully understand the technology, and is a clear guide to using ASPNET to build robust and well architected Web applications Listing 11-15 Hashing Passwords This book begins with a discussion of the rationale behind the design of ASPNET and an introduction to how it builds on top of the NET framework Subsequent chapters explore the host of new features in ASPNET, <%@ Page language=C# %> including the server-side compilation model, code-behind classes, server-side controls, form validation, the <html> data binding model, and custom control development Throughout the book, working examples illustrate <script runat=server> best practices for building Web-based applications in C#
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public void OnClick_Login(Object src, EventArgs e) { Among the topics explored in depth are: // Calculate hash of password to check against // database entry string passHash = FormsAuthentication ASPNET architecture HashPasswordForStoringInConfigFile(_passwordText, "sha1"); Web forms // use passHash in a database query here to look up Configuration // password hash instead of clear text password // then call FormsAuthenticationRedirectFromLoginPage HTTP username and password hash are correct // ifpipeline } Diagnostics and error handling </script> <body> Validation <form runat=server> <h2>Login Page</h2> Username: Data binding <asp:TextBox id="_username" runat=server/><br/> Password: Custom controls <asp:TextBox id="_password" TextMode="password" runat=server/> Caching <br/> Remember password : State management <asp:CheckBox id=_persistCookie runat="server"/>
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<br/> [ Team LiB ] <asp:Button text="Login" OnClick="OnClick_Login" runat=server/><br/> </form></body> </html>
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You might have noticed that the name of the function used to hash passwords is not just HashPassword but HashPas Microsoft developer building this class wanted the title of "longest API function in NET" but also because you can stor that you will want to take advantage of this feature in any reasonably sized application, because managing usernames 11-16 shows a sample webconfig file that stores user credentials, and Listing 11-17 shows a sample page that use those credentials Listing 11-16 Storing User Credentials in webconfig
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Table of Contents
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<configuration> Essential ASPNET with Examples in C# <systemweb> ByFritz Onion <authorization> <deny users=" "/> Publisher : Addison Wesley </authorization>
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Pub Date ISBN Pages
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: February 11, 2003
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: 0-201-76040-1 <authentication mode="Forms"> : 432 <forms loginUrl="loginaspx"> <credentials passwordFormat="SHA1"> <user name="Alice" password="9402F2262"/> <user name="Bob" password="EA9003E95"/> "This well-conceived and well-written book has extensive knowledge and priceless experience overflowing </credentials> from its</forms>captures the true essence of ASPNET and walks the reader to a high level of technical and pages It architectural skill"-J Fred Maples, Director of Software Engineering, NASDAQcom </authentication> </systemweb> Essential ASPNET with Examples in C# is the C# programmer's definitive reference for ASPNET through </configuration>
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version 11 It provides experienced programmers with the information needed to fully understand the technology, and is a clear guide to using ASPNET to build robust and well architected Web applications
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Listing 11-17 Authenticating Users with webconfig-Based Credentials This book begins with a discussion of the rationale behind the design of ASPNET and an introduction to how it builds on top of the NET framework Subsequent chapters explore the host of new features in ASPNET, including the server-side compilation model, code-behind classes, server-side controls, form validation, the <%@ Page language=C# %> data binding model, and custom control development Throughout the book, working examples illustrate <html> best practices for building Web-based applications in C#
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<script runat=server> public void explored in depth are: Among the topics OnClick_Login(Object src, EventArgs e) { if (FormsAuthenticationAuthenticate(_usernameText, _passwordText)) ASPNET architecture FormsAuthenticationRedirectFromLoginPage( Web forms _usernameText, _persistCookieChecked); else Configuration _messageText = "Invalid login: Please try again"; } HTTP pipeline </script> <! body and form not shown - see earlier examples > Diagnostics and error handling </html>
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