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Objects: The Stuff You Want
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Figure 3-9 Table 3-5
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When you create or modify an ACE you get to pick its inheritance behavior.
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ACL UI Inheritance to Flag Mapping
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Flags <none> OI CI (object inherit, container inherit) CI OI OI CI IO (inherit only) CI IO OI IO
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ACL UI Term This folder only This folder, subfolders, and files This folder and subfolders This folder and files Subfolder and files only Subfolders only Files only
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Apply these permissions to objects and/or containers NP (no propagation inherit ACE) within this container only
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Inheritance takes some getting used to, but once you understand the major concepts it becomes quite clear and the major complication is understanding how it impacts large hierarchies. You need to know the following main concepts:
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Container inheritance causes ACEs to be inherited by containers, while object inheritance causes ACEs to be inherited by objects. You also need to understand what the definition of a container and an object is for a particular object type. A protected ACL overrides all inheritance from its parents. An inherit-only ACE is not used to control access on the container where it is defined. A no-propagation ACE applies only to the container where it is defined.
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Part I:
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Windows Security Fundamentals
Next, however, to truly appreciate inheritance, you need to understand how the actual ACEs are evaluated in an access check, so we now turn to that. To start out we need to understand the concept of a security token.
Security Tokens
When a user logs on to a Windows computer, the operating system creates a token for the user. This token contains a statement of who the user the subject is, what groups it is a member of, and what privileges it has. In some cases, under User Account Control (UAC), the operating system actually creates two tokens for the subject. You can read more about that in 4, Understanding UAC. You can view the tokens using Microsoft s Process Explorer tool, which is available at http:// www.microsoft.com/technet/sysinternals/ProcessesAndThreads/ProcessExplorer.mspx. Figure 3-10 shows the filtered standard user token for an administrator under UAC. Figure 3-11 shows the full administrative token for the same user.
Figure 3-10 A filtered token has almost all the privileges removed and has the Administrators group set to Deny.
Figures 3-10 and 3-11 demonstrate several important points. First, notice that in the filtered token the Administrators SID is set to Deny. This means that it can only ever be used to deny access to something. In other words, if an ACL contains an allow ACE for Administrators, the filtered token would not match. Only if the ACE were a deny ACE would there be a match.
3:
Objects: The Stuff You Want
Figure 3-11 In the full administrative token the user s full complement of privileges is listed.
Second, notice that many of the privileges in both tokens are disabled. This does not mean the user cannot use those privileges. All it means is that a process that needs them needs to first enable them, which can be as simple as a single function call. Disabling the privileges serves to protect the user only from accidental privilege use. It provides no security benefit. Third, notice the sheer number of SIDs in the token. Although you may only see two groups when you inspect the user s group membership (Users and Administrators in this case), a lot of other SIDs indicate how the user logged on, among other things. All subjects, except anonymous users, have the Everyone SID in their token by default. All subjects who authenticated in other words, not anonymous users or guests also have the Authenticated Users SID in their token. This means that because the Guest account is disabled by default, Everyone and Authenticated Users are functionally equivalent. This has been the case since Windows Server 2003 and Windows XP. The tokens in Figures 3-10 and 3-11 also have several SIDs denoting the log-on type. First, there is the LOCAL SID, which means the user logged on to a terminal physically connected to the computer. We also see the Logon SID, which is an identifier for the log-on session assigned to this user. Most of the windows in a user s session are protected to the Logon SID. Then we have the INTERACTIVE SID, which states that this user is logged on interactively to the computer, as opposed to over the network. The difference between this SID and the LOCAL SID is that terminal server users have the INTERACTIVE SID but not the LOCAL SID.
Part I:
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