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Table 11-4 lists the default machine code groups residing directly within the All_Code code group. Additionally, some of these code groups contain nested code groups.
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Lesson 1: Understanding Code Access Security
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Table 11-4 Default Code Groups
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Code Group My_Computer_Zone LocalIntranet_Zone Internet_Zone Restricted_Zone Trusted_Zone
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Evidence Zone: My Computer Zone: Local Intranet Zone: Internet Zone: Untrusted sites Zone: Trusted sites
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Permission Set FullTrust LocalIntranet Internet Nothing Internet
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What Is Security Policy
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A security policy is a logical grouping of code groups and permission sets. Additionally, a security policy can contain custom assemblies that define other types of policies. Security policies provide administrators with the flexibility to configure CAS settings at multiple levels. By default, there are four configurable policy levels: Enterprise, Machine, User, and Application Domain. Application Domains were described in 8, Application Domains and Services. The Enterprise level is the highest security policy level, describing security policy for an entire enterprise. Enterprise security policy can be configured by using the Active Directory directory service. Machine policy, the second security policy level, applies to all code run on a particular computer. User policy is the third level, and it defines permissions on a per-user basis. The runtime evaluates the Enterprise, Machine, and User levels separately, and it grants an assembly the minimum set of permissions granted by any of the levels (known as the intersection of the permission sets). By default, the Enterprise and User security policies grant all code full trust, which causes the Machine security policy to alone restrict CAS permissions.
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Usefulness of Multiple Layers of Security Policy
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To understand how security policies are used, consider an application developer who wants to play with an assembly she downloaded from the Internet. The developer has downloaded the assembly to her local computer, so it will run within the My Computer Zone. The developer s computer is a member of an Active Directory domain, and a domain administrator has created a code group in the Enterprise security policy that grants assemblies on the local computer
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Application Security
the Everything permission set. This is more restrictive than the FullTrust permission set that the Machine security policy grants assemblies in the My Computer zone, so the Everything permission set takes precedence. The developer isn t sure that the assembly is safe to run, however, so she wants to apply the Internet permission set to prevent the assembly from writing to the disk or communicating across the network. She doesn t log on to her computer as an Administrator, but she can still launch the .NET Framework Configuration tool and modify the User security policy. (Standard users aren t allowed to modify the Machine security policy.) By modifying the User security policy, she can restrict assemblies in the My Computer zone to the Internet permission set. Assemblies that she runs will be restricted without affecting other users of the same computer. The assembly is a member of three code groups: one in the Enterprise security policy, one in the Machine security policy, and one in the User security policy. The runtime determines the assembly s permissions by comparing each code group s permission sets and using the most restrictive set of permissions shared by all three permission sets (the intersection). Because the FullTrust and Everything permission sets contain all the Internet permission set s permissions (plus a few more permissions), the most restrictive set of permissions is exactly that defined by the Internet permission set.
How CAS Works with Operating System Security
CAS is completely independent of operating system security. In fact, you must use entirely different tools to administer CAS. Although you can control a user s or group s file permissions using Microsoft Windows Explorer, you have to use the .NET Framework Configuration tool to grant or restrict an assembly s file permissions. CAS works on top of existing operating system security. When determining whether an assembly can take a particular action, both CAS and the operating system security are evaluated. The most restrictive set of permissions is applied. For example, if CAS grants an assembly access to write to the C:\Windows\ folder but the user running the assembly does not have that permission, the assembly cannot write to the folder. Figure 11-5 shows how CAS relates to operating system security.
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