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Now that you have seen the role of various .NET security atoms, you can turn your attention to the specifics of securing ASP .NET web applications. Do recall, however, that an ASP .NET web application is ultimately just another valid .NET assembly. Like any assembly, your ASP.NET web applications contain CIL code, type metadata, and manifest information. Given this point, many of the previous security-centric topics apply directly to Web development under the .NET platform (storing passwords as hash codes, strongly naming external assemblies, and so forth). In addition to the general .NET security options, ASP .NET does provide Web-specific services that address the issues of authentication and authorization. Under ASP .NET, these two security needs are addressed in part by tweaking various settings within a server side web.config file. Like other XML-based files, web.config files can contain any number of subelements under the root <configuration> node, each of which can contain various attributes and possibly further subelements. At a very high level, a web.config file can be broken into the following skeleton: <configuration> <system.web> <authentication/> <authorization/> <browserCaps/> <clientTarget/> <compilation/> <customErrors/> <globalization/> <httpHandlers/> <httpModules/> <httpRuntime/>
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CHAPTER 5 .NET 2.0 SECURITY
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<identity/> <machineKey/> <pages/> <processModel/> <securityPolicy/> <serviceDescriptionFormatExtensionTypes/> <sessionState/> <trace/> <trust/> <webServices/> </system.web> </configuration>
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Note The purpose of this chapter is not to detail each and every option within a web.config file (that would require a small book on its own). Rather we focus on select security-specific elements. If you wish to see each and every option, look up the ASP.NET Settings Schema topic using the .NET 2.0 Framework SDK Documentation.
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While it s not mandatory to include a web.config file as far as the ASP .NET runtime is concerned, they are downright mandatory when securing an ASP .NET web application. So much so that it s not uncommon for a single ASP .NET web application to make use of multiple web.config files. By doing so, you re able to leverage configuration inheritance.
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Understanding Configuration Inheritance
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Most ASP .NET web applications contain, at the very least, a single web.config file that sits in the root directory. When you insert a new web.config file using Visual Studio 2005 (via the Website Add New Item menu option), the default XML looks something like the following (comments have been removed for clarity): < xml version="1.0" > <configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0"> <appSettings/> <connectionStrings/> <system.web> <compilation debug="false"/> <authentication mode="Windows"/> </system.web> </configuration> Note that the scope defined by <system.web> is where all of your ASP .NET security settings end up. The optional <appSettings> and <connectionStrings> elements provide a handy location to enter application-specific data and ADO.NET connections string values that may be obtained programmatically (see 10 for a close look at using and encrypting the new connectionStrings element).
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CHAPTER 5 .NET 2.0 SECURITY
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In any case, when you have a web.config file located within the root directory, each subdirectory inherits the settings it defines. However, if you require, you may include specific web.config files that can effectively override the settings found in the parent web.config files higher up in the directory structure. Figure 5-6 illustrates one possible use of configuration inheritance.
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Figure 5-6. Configuration inheritance under ASP .NET Notice that this site has a subdirectory named SiteAdmin that contains its own unique configuration file, while the site as a whole is configured using the settings found within the root level web.config file. The idea (as you may suspect) is that access to SiteAdmin is more restrictive than the than of the root directory s content, and is, therefore, constrained using custom configuration settings.
Note If your websites do not contain a specific web.config file, they will inherit all of the default settings found within the machine-wide machine.config file. Given this, understand that a root level web.config file is actually overriding various settings in machine.config.
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