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1.1.1.4 Resource Managers

In the DAC model, a resource manager (RM) is the code or component that implements one or more securable object types. Many RMs--including the file system, registry, Active Directory, and operating system constructs, such as processes--exist in a Windows-based system. The NTFS file system is a resource manager that implements files and directories; the Windows registry is a resource manager that implements keys. Even though these RMs control very different objects, they share a common method for controlling access.

Windows also distinguishes between ordinary objects in the RM and containers that are exposed by the RM. In the file system, files are objects and directories are containers. This distinction is important during the creation of new objects.

To participate in the authorization scheme, the resource manager is required to maintain a security descriptor with each object that is protected. The resource manager merely needs to be able to retrieve the security descriptor for an object when authorization validation is required and is not required to understand the contents.

 
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