upc internet 200+ Putting Webconfig to Work in .NET framework

Make UPC A in .NET framework Putting Webconfig to Work

Putting Webconfig to Work
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The idea behind web security is to filter You want those who are allowed access to get it easily, and you want to keep everyone else out Picture an e-business application that requires more than one entry portal The public portal is open to everyone This is where customers and clients enter to purchase products and services Other portals only allow
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16: Security
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certain people in An administrative portal where orders are processed can be available only to certain people Such portals need to be guarded against intrusion, and ideally, you don t even want others to know it exists For example, if a user intentionally or accidentally accesses a general folder on the server, you do not want that person to see all of the files in that folder The first line of defense is the webconfig file It is an XML file with the config extension As you have been developing ASPNET applications, one of the files automatically generated is a little webconfig file with information about the web site s environment If you open it, you will see all kinds of information For example, you will see that your application has been developed by version 3500 of ASPNET (Your information may be slightly different if you have a newer version of ASPNET 35) However, the most basic webconfig file is one that comes up in an error message that reads as follows:
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<!-- Webconfig Configuration File --> <configuration> <systemweb> <customErrors mode="Off"/> </systemweb> </configuration>
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If you place this file in the root directory of your IIS server, the general errors in a file are displayed, but your custom errors have been turned off For the most part, that is a handy tool for testing on the Internet, but it is not the webconfig file you want in a production environment
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Using Multiple Webconfig Files
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When you want users to have access to some files and not others, one way to control access is to use multiple webconfig files A webconfig file in the root directory affects all of the files, but if you place a different webconfig file in a subdirectory, it will override the root webconfig file For example, suppose you have the following directory structure: Root (webconfig) ASPNET Display Dreamer MapFile Special Lists (webconfig)
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All of the files and folders in the root directory are subject to the directives in the root webconfig file However, in the Special directory is another webconfig file that is open to all users:
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<configuration> <systemweb> <authorization> <allow users="*" /> </authorization> </systemweb> </configuration>
The <allow> node indicates which users have access, and the asterisk (*) is an all wildcard symbol The files in the Lists directory are subject to this second webconfig file Figure 16-1 shows the actual files on a production server
Root webconfig file does not allow anonymous login Files in the Lists folder can be accessed by all users
Subdirectory webconfig file overrides root file
Figure 16-1 Overriding root webconfig
16: Security
So while you can severely restrict user access to a wide range of files on your server, you also can isolate certain directories and files where you want users to have full access In effect, you have the best of both worlds; control over user access on some files and wide-open access on others
Developing a Forms Authentication Configuration
The first step in protecting your site is to develop a webconfig file that has both an authentication and an authorization filter If you use Forms authentication, all users are sent to a login page on their first visit Once they have been authenticated, they can return to the site without having to go through a login process For an e-business site, having ease of access is important for attracting and keeping customers With Forms authentication, no matter what page the user requests, he is automatically sent to a login page with the default name loginaspx Once he fills out the login information, he is allowed to view the page requested initially The following webconfig file shows the required tags:
<configuration> <systemweb> <authentication mode ="Forms" /> <authorization> <deny users=" " /> </authorization> </systemweb> </configuration>
As noted, the authentication mode set to Forms automatically directs the browser to open a file named loginaspx, but if you want to change that to a specific file with a name you prefer, you can specify which one you want by using the tags
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