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used. Additionally, if the use of the privilege to generate audit were itself audited, the log would fill with this event, so SeAuditPrivilege is never audited. You could think of it this way: Every event in the Security event log is also a privilege use event for SeAuditPrivilege. Either way, this is another setting that you should probably not enable unless you are required to do so. The AuditBaseObjects and AuditBaseDirectories settings cause named kernel objects (such as mutexes and semaphores) to be given SACLs when they are created. AuditBaseDirectories affects container objects; AuditBaseObjects affects objects that cannot contain other objects. Base objects are usually used to synchronize activity between two processes. Most kernel objects are not named they are referred to only by a number called a handle. Handles are unique to a specific process, so processes cannot see or access unnamed kernel objects that they did not create. Named kernel objects are visible to other processes unless a process requests a private namespace. The risk of named kernel objects is that if they are not properly secured, a malicious process can manipulate them, possibly causing a malfunction in the processes that normally use the objects. This is commonly known as a squatting attack. AuditBaseObjects and AuditBaseDirectories exist so that you can audit the access to these objects and detect squatting attacks from the log. The main problem with AuditBaseObjects and AuditBaseDirectories is that they can cause significant audit volume because of the large number of accesses to these objects that occurs during normal operation. The SACLs that are applied are hard-coded and cannot be adjusted by the user, but were tuned in Windows Vista and Windows Server 2008 to only audit write type accesses to these objects, reducing the volume significantly over previous releases. Another limitation of the SACL mechanism is that SACLs persist for the lifetime of the object they are applied when the object is created, which is during startup for system-created objects and during the initialization procedure for processes that create their own objects. The SACLs do not change until the object is destroyed, which is usually during shutdown (for system objects) or process termination of the process that created the object. This basically means that effectively you must reboot to enable or disable AuditBaseObjects or AuditBaseDirectories. There is no central repository of information about kernel objects. Most software development organizations would typically not publish this kind of information because it deals with internal workings of software and is not user-configurable. Therefore even if you enable AuditBaseObjects or AuditBaseDirectories you will probably find it difficult or impossible to determine what a particular object does or is used for, unless the name of the object is especially descriptive. For this reason you should not enable these settings in production environments unless you are required to do so. You can examine base objects using the Process Explorer tool from Microsoft s SysInternals Web site at http:// www.microsoft.com/technet/sysinternals/SystemInformation/ProcessExplorer.mspx. (See Figure 8-8.)
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Figure 8-8
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Process Explorer being used to examine a base named object.
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In addition to the Granular Audit Policy feature, there are a couple of minor enhancements to audit policy in Windows Server 2008.
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Windows XP introduced a mechanism to set exceptions to audit policy on a per-user basis, called Per User Selective Audit, or per-user auditing. In Windows Vista and Windows Server 2008 that mechanism still exists and has been integrated more tightly into the audit policy mechanism: Where separate tools were once used to set per-user audit policy, now the tools (and their underlying APIs) are the same for both per-user and system audit policy.
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Audit Policy Delegation
A Windows system has six audit-policy related tasks:
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