c# barcode scanning library The Evaluation Process for Managed Code in Software

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The Evaluation Process for Managed Code
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The CLR uses an eight-step evaluation process for managed code (see Figure 10-12) It uses the following steps: 1 When an assembly (a piece of managed code) calls upon another assembly, the CLR evaluates the permission level to apply to the new assembly
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2 The first thing the new assembly must do is provide evidence This evidence is, in fact, a set of answers to questions posed by the CLR s security policy 3 Three questions are asked about the source of the assembly: a From which site was the assembly obtained Assemblies are automatically downloaded to the client from a web site b From which Uniform Resource Locator (URL) did the assembly originate A specific URL address must be provided by the assembly c From which zone was the assembly obtained This applies to Internet Explorer zones such as Internet, Intranet, Local Machine, and so on Some zones are more trusted than others
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FIGURE 10-12
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The NET Framework security allocation process
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4 The assembly must also provide a cryptographically strong identifier, called its strong name This identifier is unique and must be provided by the author of the assembly The identifier does not necessarily identify the author, but it does identify the assembly as unique 5 Evidence is gathered from a series of different sources, including the CLR itself, the browser, ASPNET, the shell, and so on Once the evidence is provided, the CLR begins to determine the security policy to apply First, it applies the evidence against standard code groups These groups contain standard policies, depending on the zone from which the assembly originates The NET Framework includes basic code groups, but administrators can add their own or modify the default groups 6 Once the code group is determined, the policy is defined This policy can be defined at three levels and in this order: Enterprise, Machine, and User A fourth level involves the application domain This domain provides an isolated environment for the application to run in An application contained within a domain cannot interfere with any other domain on the same machine 7 Once the policy has been set, an initial set of permissions is created The assembly can fine-tune this set of permissions in three ways: a First, it can identify the minimum set of permissions it requires to run b Second, it can specify optional permissions These are not absolutely required c Third, a well-behaved assembly can refuse permissions it doesn t require and deems too risky, actually reducing the permission set it is assigned by the CLR 8 All of these factors are reviewed by the policy evaluator 9 A final set of permissions is created for the assembly 10 The final stage is the stack walk The CLR compares the permission set to those of other assemblies that are involved in the original call for this assembly If any one of these assemblies does not have permission to run with this permission set, the permission to execute is denied If everything is okay, the permission to execute is granted
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D e s i g n Yo u r S e c u r i t y I n f r a s t r u c t u r e
Internet Information Server 70
As discussed in 9, IIS 7 is secure by default because it has been split into components that are only installed if you require them The safest installation of IIS is, in fact, the one you ll find on Server Core because it only serves static web sites by default In addition, Microsoft has improved upon the existing security models in earlier versions of IIS For example, in previous versions, IIS and ASPNET were separate entities In IIS 7, both have been integrated into one model While IIS still supports previous features, it now has a single integrated security model All web sites have an application pool, which is created automatically This segregates the web site from all other sites or applications on the Web server Application pools run under NetworkService by default, once again limiting the access rights they have on the server itself In order to make sure your applications run under this context and only this context, you now have to install the Anonymous Authentication module and then make sure your WEBCONFIG file for the application includes the following line:
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