asp.net mvc qr code ASP.NET Security in C#

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19 ASP.NET Security
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Note Windows authentication also works with URL authorization implemented by the HTTP module named URLAuthorizationModule. This module allows or denies access to URL resources to certain users and roles. (I ll talk more about URL authorization later while discussing Forms authentication.)
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The .NET Framework (starting with 3.0) contains a new technology that can be used with ASP.NET Web sites to authenticate users: Windows CardSpace. Any page that includes the Identity Selector object, uses the identity cards of the connected user to send credentials to the server. Each user can manage her own cards by using the Windows CardSpace applet in Control Panel of any client machines equipped with the .NET Framework 3.0 or later. The Identity Selector is an <object> tag of type application/x-informationcard. By requesting the value property of this object, you force an enabled browser to bring up the CardSpace applet. The user then picks up the right card to send. The server-side login page will then access the content of the card and make any necessary checks to authorize the request. If it becomes widely accepted, Windows CardSpace could be the perfect tool for authentication over the Internet. For more information, you can start reading the following MSDN article: http://msdn.microsoft.com/en-us/magazine/cc163434.aspx.
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Using Forms Authentication
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Windows authentication is seldom practical for real-world Internet applications. Windows authentication is based on Windows accounts and NTFS ACL tokens and, as such, assumes that clients are connecting from Windows-equipped machines. Useful and effective in intranet and possibly in some extranet scenarios, Windows authentication is simply unrealistic in more common situations because the Web application users are required to have Windows accounts in the application s domain. So what is the ideal authentication mechanism for real Web developers Today, Forms authentication is the most commonly used way to collect and validate user credentials for example, against a database of user accounts. The login pattern implemented by Forms authentication doesn t look radically different from Windows authentication. The key difference is that with Forms authentication everything happens under the strict control of the Web application.
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Part IV
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You set up an ASP.NET application for Forms authentication by tweaking its root web.config file. You enter the following script:
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<system.web> <authentication mode="Forms"> <forms loginUrl="login.aspx" /> </authentication> <authorization> <deny users=" " /> </authorization> </system.web>
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The <authentication> section indicates the URL of the user-defined login form. ASP.NET displays the form only to users who have explicitly been denied access in the <authorization> section. The symbol indicates any anonymous, unauthenticated users. Note that the anonymous user here is not the IIS anonymous user but simply a user who has not been authenticated through your login form. All blocked users are redirected to the login page, where they are asked to enter their credentials. Note The Forms authentication mechanism protects any ASP.NET resource located in a folder
for which Forms authentication and authorization is enabled. Note that only resource types explicitly handled by ASP.NET are protected. The list includes .aspx, .asmx, and .ashx files, but not plain HTML pages or classic ASP pages. In IIS 7.0, though, you are given the tools to change this by setting a Web server-level web.config file where you assign new resources to the ASP.NET standard HTTP handler.
Forms Authentication Control Flow
Form-based authentication is governed by an HTTP module implemented in the FormsAuthenticationModule class. The behavior of the component is driven by the contents of the web.config file. When the browser attempts to access a protected resource, the module kicks in and attempts to locate an authentication ticket for the caller. By default, a ticket is merely a cookie with a particular (and configurable) name. However, it can be configured to be a value embedded in the URL. In this case, we talk about cookieless Forms authentication. If no valid ticket is found, the module redirects the request to a login page. Information about the originating page is placed in the query string. The login page is then displayed. The programmer creates this page, which, at a minimum, contains text boxes for the username and the password and a button for submitting credentials. The handler for the button click event validates the credentials using an application-specific algorithm and data store. If the credentials are authenticated, the user code redirects the browser to the original URL.
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