John Mitchell Unix file access

System Access Control List


An access control list (ACL) is a list of access control entries (ACE). Each ACE in an ACL identifies a trustee and specifies the access rights allowed, denied, or audited for that trustee. The security descriptor for a securable object can contain two types of ACLs: a DACL and a SACL.

A discretionary access control list (DACL) identifies the trustees that are allowed or denied access to a securable object. When a process tries to access a securable object, the system checks the ACEs in the object's DACL to determine whether to grant access to it. If the object does not have a DACL, the system grants full access to everyone. If the object's DACL has no ACEs, the system denies all attempts to access the object because the DACL does not allow any access rights. The system checks the ACEs in sequence until it finds one or more ACEs that allow all the requested access rights, or until any of the requested access rights are denied. For more information, see How DACLs Control Access to an Object. For information about how to properly create a DACL, see Creating a DACL.

A system access control list (SACL) enables administrators to log attempts to access a secured object. Each ACE specifies the types of access attempts by a specified trustee that cause the system to generate a record in the security event log. An ACE in a SACL can generate audit records when an access attempt fails, when it succeeds, or both. For more information about SACLs, see Audit Generation and SACL Access Right.

Do not try to work directly with the contents of an ACL. To ensure that ACLs are semantically correct, use the appropriate functions to create and manipulate ACLs. For more information, see Getting Information from an ACL and Creating or Modifying an ACL.

ACLs also provide access control to Microsoft Active Directory directory service objects. Active Directory Service Interfaces (ADSI) include routines to create and modify the contents of these ACLs. For more information, see Controlling Access to Active Directory Objects.



Share this article





Related Posts



Latest Posts
Fire Alarm system control Panels
Fire Alarm system…
En 1872 Robert Edwards traz√≥ el rumbo…
Systems Integrators in USA
Systems Integrators…
Automation systems integrators deploy…
Steady State Response control system
Steady State…
It is very essential to know a few basic…
Genie camera Motion control Systems
Genie camera…
Syrp Time Lapse System: Hands-On Review…
Control Systems Video lectures
Control Systems…
Introduction to control problem Industrial…
Search
Featured posts
  • Smart key Access Control System
  • Paxton Access Control Systems
  • What is Access Control Systems?
  • Security Access Control Systems
  • Access Control Systems UK
  • Parking Access Control Systems
  • Biometric door Access Control Systems
  • Card readers Access Control Systems
  • Electronic Access Control Systems
Copyright © 2020 l www.oliver-control.com. All rights reserved.