Security in .NET

Generating QR Code in .NET Security

Security
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This means that an assembly won t be allowed to execute unless it also belongs to another code group with sufficient permissions. There are six child code groups under the All_Code group, the first five of which corre spond to one of the security zones defined for Internet Explorer: My_Computer_Zone, LocalIntranet_Zone, Internet_Zone, Restricted_Zone, and Trusted_Zone. (The sixth code group, Wizard_0, is for use by the .NET Configuration tool only.) In the default configuration, the My_Computer_Zone group is associated with the FullTrust permission set; LocalIntranet_Zone is associated with the LocalIntranet permis sion set; Trusted_Zone and Internet_Zone are associated with the Internet permission set; and the Restricted_Zone is associated with the Nothing permission set. (In other words, assemblies from sites in the Restricted zone aren t allowed to run by default.) You can organize code groups in a hierarchy to express quite sophisticated membership conditions. For example, let s say you want to associate the DataReaders custom permission set with a strong name assembly named SampleNetComponent when this assembly is downloaded from the Internet. You already have a code group that matches the condition any assembly loaded from the Internet, so it makes sense to create a new code group as a child of the Internet_Zone code group. Right-click on the Internet_Zone group and select New to start the Create Code Group wizard. On the first page, enter a name for the code group for example, Data_Reader and a short description. On the second page you can set all the mem bership conditions for this group. In this specific case, you specify the strong name an assembly must have to be part of this code group, as shown in the left portion of Fig ure 33-6. (The easiest way to fill the Public Key field is clicking on the Import button and point to an existing DLL.) In the third and last page, you select which permission set is assigned to assemblies in this code group (DataReaders, in this case). The list in the combo box shown in the right portion of Figure 33-6 matches the list of permission sets defined for the current policy level (Machine, in this case). You can t assign the custom DataReaders permission set to a code group at the Enterprise or User level unless you copy the DataReaders permission set under another policy level. (You can copy and paste or just drag the element while you press the Ctrl key, as you d do in Windows Explorer.) The hierarchical nature of the policy level requires that the membership condition of a nested code group narrows the membership condition of its parent code group, rather than making it less restrictive. For example, the Data_Readers code group is a child of the Internet_Zone code group and therefore inherits the Zone = Internet membership condition from its parent code group. If you accidentally change the Zone condition to Local Intranet, the policy manager will ignore the new Data_Readers code group because it never will be reached when comparing assembly evidence with the mem bership conditions of the hierarchy under the All_Code element.
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Part VII:
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Figure 33-6 You can set the membership condition of a new code group (left) and associate all the assemblies in this group with a given permission set among those defined for the current policy level (right).
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There are code groups whose membership or permission set can t be established in terms of standard evidence and standard permission objects. For example, assemblies running from a directory on the local intranet should be allowed to read files from that directory, but this condition can t be expressed with a standard FileIOPermission object because the path would be different for each assembly. Likewise, it looks impossible to grant the right to connect back to the Web site the assembly was loaded from (but not to other Web sites). In cases like these, you can only use a custom code group class. A custom code group is a class that you define in a strong name assembly installed in the GAC. You then inform the .NET policy manager that your custom code group is part of the policy level hierarchy by creating a piece of XML text and importing that text in the correct position of the code group hierarchy. Figure 33-7 clearly shows that the property window of a custom code group has no Membership Condition or Permission Set tabs because this information is defined via code. Read the MSDN docu mentation for more information about creating a custom code group.
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Figure 33-7
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