Inheritance in C#.NET

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Inheritance
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Windows Server 2003 supports permissions inheritance, which simply means that permissions applied to a folder will, by default, apply to the files and folders beneath that folder. Any change to the parent s ACL will similarly affect all contents of that folder. Inheritance enables you to create single points of administration, managing a single ACL on a branch or resources under a folder.
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Understanding Inheritance
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Inheritance is the result of two characteristics of a resource s security descriptor. First, permissions are, by default, inheritable. As previously shown in Figure 6-5, the permission Allow Users to Read & Execute is specified to Apply to: This folder, subfolders, and files. That alone, however, is not enough to make inheritance work. The other half
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Files and Folders
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of the story is that new objects, when created, are set by default to Allow Inheritable Permissions From The Parent To Propagate To This Object... the check box visible in the same figure. So a newly created file or folder will inherit the inheritable permissions from its parent, and any changes to the parent will affect the child files and folders as well. It is helpful to understand this two-step implementation of inheritance because it gives us two ways to manage inheritance: from the parent and from the child. Inherited permissions are displayed differently in each dialog box of the ACL editor. The first and third dialog boxes (Security tab and Permissions Entry For Docs) show inherited permissions as dimmed check marks to distinguish them from permissions that are set directly on the resource, called explicit permissions, which are not dimmed. The second dialog box (Advanced Security Settings) shows, for each permission entry, from what folder the permission entry is inherited.
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Overriding Inheritance
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Inheritance allows you to configure permissions high in a folder tree. Such initial permissions, and any changes to those permissions, will propagate to all the files and folders in that tree that are, by default, configured to allow inheritance. Occasionally, however, you might need to modify permissions on a subfolder or file to provide additional access or restrict access to a user or group. You cannot remove inherited permissions from an ACL. You can override an inherited permission by assigning an explicit permission. Alternatively, you can block all inheritance and create an entirely explicit ACL. To override an inherited permission by assigning an explicit permission, simply check the appropriate permissions box. For example, if a folder has an inherited Allow Read permission assigned to the Sales Reps group, and you do not want Sales Reps to access the folder, you can select the box to Deny Read.
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Removing Inheritance
To override all inheritance, open the resources Advanced Security Settings dialog box and clear Allow Inheritable Permissions From The Parent To Propagate To This Object.... You will block all inheritance from the parent. You will then have to manage access to the resource by assigning sufficient explicit permissions. To help you create an explicit permissions ACL, Windows gives you a choice when you choose to disallow inheritance. You are asked whether you want to Copy or Remove permissions entries, as shown in Figure 6-7.
Lesson 2
Configuring File System Permissions
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Figure 6-7
Copying or removing permissions entries
Copy will create explicit permissions identical to what was inherited. You can then remove individual permissions entries that you do not want to affect the resource. If you choose Remove, you will be presented with an empty ACL, to which you will add permissions entries. The result is the same either way; an ACL populated with explicit permissions. The question is whether it is easier to start with an empty ACL and build it from scratch or start with a copy of the inherited permissions and modify the list to the desired goal. If the new ACL is wildly different from the inherited permissions, choose Remove. If the new ACL is only slightly different from the result of inherited permissions, it is more efficient to choose Copy. When you disallow inheritance by deselecting the Allow Inheritable Permissions option, you block inheritance. All access to the resource is managed by explicit permissions assigned to that file or folder. Any changes to the ACL of its parent folder will not affect the resource; although the parent permissions are inheritable, the child does not inherit. Block inheritance sparingly because it increases the complexity of managing, evaluating, and troubleshooting resource access.
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