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The security systems in Windows XP Professional are based on technologies originally developed for Windows NT. The access control models in Windows NT, Microsoft Windows 2000, Microsoft Windows Server 2003, and Windows XP Professional share the same key concepts and characteristics, which are described in the following sections. Discretionary access to securable objects The user who owns an object has ultimate control over who has permission to use it and in what way. An object s owner can give permission for different kinds of access to particular users or groups of users. For example, the owner of a file object can give Read and Write permission to all members of one group while denying Write access to members of another group. In Windows XP Professional, owners can Allow or Deny other users access to individual properties of certain types of objects as well as to the entire object. The properties that can be delegated include permissions that Allow or Deny other users access to the object. Inheritance of permissions You can control permissions for new objects created in a container object by setting inheritable permissions on the container. The permissions that you set on a container are inherited by existing objects in the container, as well as by newly created objects. For example, the permissions that are set on an NTFS file system folder are inherited by new subfolders and files created within the folder. Auditing of system events You can use the auditing feature to detect attempts to circumvent protections on resources or to create an audit trail of administrative actions on the system. For example, you can audit failed attempts to open a file. You can also set security policy so that failed logon attempts are recorded in the security event log. If another administrator changes the auditing policy so that failed logon attempts are no longer audited, the log can record this event as well. In an Active Directory environment, you can use Group Policy to centrally control who is allowed to manage security logs on computers joined to a domain.
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Access control involves the configuration of rights and permissions, which apply to both the objects on the local computer or network and the potential users (including individuals, computers, and services) of those objects. A right is authorization to perform an operation. From an administrator s point of view, there are two types of rights: privileges and logon rights. In Windows XP Professional, only one user right is inherent the right to allow or deny access to resources that you own. All other user rights must be granted, which means that they can also be withdrawn. A permission is authorization to perform an operation on a specific object, such as opening a file. Permissions are granted by owners. If you own an object, you can grant any user or security group permission to do whatever you are authorized to do with it.
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When permission to perform an operation is not explicitly granted, it is implicitly denied. For example, if Alice allows the Marketing group, and only the Marketing group, permission to read her file, users who are not members of the Marketing group are implicitly denied access. The operating system will not allow users who are not members of the Marketing group to read the file. Permissions can also be explicitly denied. For example, Alice might not want Bob to be able to read her file, even though he is a member of the Marketing group. She can exclude Bob by explicitly denying him permission to read the file. In fact, this is exactly how explicit denials are best used to exclude a subset (such as Bob) from a larger group (such as Marketing) that has been given permission to do something. Each permission that an object s owner grants to a particular user or group is stored as part of an ACE in a DACL that is part of the object s security descriptor.
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