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In computer security, an access-control list (ACL) is a list of permissions [a] associated with a system resource (object or facility). An ACL specifies which users or system processes are granted access to resources, as well as what operations are allowed on given resources. [1] Each entry in a typical ACL specifies a subject and an operation.
In Microsoft Windows, cacls, and its replacement icacls, are native command-line utilities that can display and modify the security descriptors on files and folders. [1] [2] An access-control list is a list of permissions for securable object, such as a file or folder, that controls who can access it.
Security descriptors are data structures of security information for securable Windows objects, that is objects that can be identified by a unique name.Security descriptors can be associated with any named objects, including files, folders, shares, registry keys, processes, threads, named pipes, services, job objects and other resources.
Consequently, any attempt to access the referenced object must be validated by the operating system, based on the ambient authority of the requesting program, typically via the use of an access-control list (ACL). Instead, in a system with capabilities, the mere fact that a user program possesses that capability entitles it to use the ...
Windows 10: Windows Command Prompt: Text-based shell (command line interpreter) that provides a command line interface to the operating system Windows NT 3.1: PowerShell: Command-line shell and scripting framework. Windows XP: Windows Shell: The most visible and recognizable aspect of Microsoft Windows.
The entry in a cell – that is, the entry for a particular subject-object pair – indicates the access mode that the subject is permitted to exercise on the object. Each column is equivalent to an access control list for the object; and each row is equivalent to an access profile for the subject. [2]
In Unix and Unix-like operating systems, chmod is the command and system call used to change the access permissions and the special mode flags (the setuid, setgid, and sticky flags) of file system objects (files and directories).
Attribute-based access control (ABAC), also known as policy-based access control for IAM, defines an access control paradigm whereby a subject's authorization to perform a set of operations is determined by evaluating attributes associated with the subject, object, requested operations, and, in some cases, environment attributes.