Connecting to SQL Server Using Integrated Security from ASP.NET

[ Team LiB ] Recipe 1.8 Connecting to SQL Server Using Integrated Security from ASP.NET Problem You want to coordinate Windows security accounts between an ASP.NET application and SQL Server.
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Connecting to SQL Server Using Integrated Security from ASP.NET [ Team LiB ]Recipe 1.8 Connecting to SQL Server Using Integrated Security from ASP.NETProblemYou want to coordinate Windows security accounts between an ASP.NET applicationand SQL Server.SolutionConnect to SQL Server from ASP.NET using Windows Authentication in SQL Server.DiscussionConnecting to a SQL Server database provides two different authentication modes:Windows Authentication Uses the current security identity from the Windows NT or Windows 2000 user account to provide authentication information. It does not expose the user ID and password and is the recommended method for authenticating a connection.SQL Server Authentication Uses a SQL Server login account providing a user ID and password.Integrated security requires that the SQL Server is running on the same computer as IISand that all application users are on the same domain so that their credentials areavailable to IIS. The following areas of the application need to be configured: • Configure the ASP.NET application so that Integrated Windows Authentication is enabled and Anonymous Access is disabled. • The web.config file establishes the authentication mode that the application uses and that the application will run as or impersonate the user. Add the following elements to the web.config file: • • The connection string must contain attributes that tell the SQL Server that integrated security is used. Use the Integrated Security=SSPI attribute-and-value pair instead of the User ID and Password attributes in the connection string. The older attribute-and-value pair Trusted_Connection=Yes is also supported. • Add users and groups from the domain and set their access permissions as required.By default, ASP.NET applications run in the context of a local user ASPNET on IIS. Theaccount has limited permissions and is local to the IIS computer and therefore notrecognized as a user on remote computers. To overcome this limitation when SQL Serveris not on the same computer as IIS, run the web application in the context of a domainuser recognized on both IIS and SQL Server computers.In addition to the areas identified where IIS and SQL Server are on the same computer,the following additional items must be configured if the SQL Server is on a differentcomputer: • Ensure that the mapped domain user has required privileges to run the web application. • Configure the web application to impersonate the domain user. Add the following elements to the web.config file for the web application: • • [ Team LiB ]