What is Access Control List
Access Control List [ACL] refers to the permissions attached to an object that specifies which users are granted access to that object. Furthermore, it also specifies the operations the users can perform using that object.
A file system ACL contains entries that specify individual user or group rights to specific system objects such as programs, processes, files, and programs. These entries are called access control entries [ACEs] in the Microsoft Windows NT, OpenVMS, UNIX, and Mac OS X operating systems. Moreover, each system object has a security attribute to recognize its ACL.
Networking ACLs provide rules that apply to port numbers or IP addresses available on a host. The list consists of hosts that have permission to use the services. Furthermore, individual servers and routers can have network ACLs. It is possible to configure ACL to control both inbound and outbound traffic. Therefore, it works similar to a firewall. Furthermore, SQL based systems such as ERP [Enterprise Resource Planning] and Content Management Systems contain ACL models in their administration modules.
What is Access Control Matrix
Access control Matrix allows implementing protection model. This matrix contains rows and columns. Rows represent the domain. It can be a user, process or a procedure domain. Columns, on the other hand, represent the objects or resources. An expel Access Control Matrix is as follows.
Each entry in the matrix represents access right information. In the entry access [Di, Oj], Di represents a process in the domain while Oj represents an object or the resource. According to the above matrix, a process in domain 1 can read File 1. A process in domain 2 can take printouts, and a process in domain 3 can execute File 3. Moreover, a process in domain 4 can write to File 2. This is how the Access Control Matrix operates.
Access Control Matrix and Capability List
BlogThere is often confusion about the relationship between access control matrix and capability list or access control list when in fact these can be captured in a single image for clarity and simplicity purposes. You can think of access control matrix as a security access table which combines ACL and user capability list to define who can access what and to which degree. In the ACM, columns define objects and assigned privileges or ACL, rows list users or subjects, and relationships between rows and columns define user capabilities or UCL.
Domain 3: Security Engineering [Engineering and Management of Security]
Eric Conrad, ... Joshua Feldman, in CISSP Study Guide [Third Edition], 2016
Access Control Matrix
An access control matrix is a table that defines access permissions between specific subjects and objects. A matrix is a data structure that acts as a table lookup for the operating system. For example, Table 4.1 is a matrix that has specific access permissions defined by user and detailing what actions they can enact. User rdeckard has read/write access to the data file as well as access to the data creation application. User etyrell can read the data file and still has access to the application. User rbatty has no access within this data access matrix.
Table 4.1. User Access Permissions
| rdeckard | Read/Write | Execute |
| etyrell | Read | Execute |
| rbatty | None | None |
The rows of Table 4.1 show the capabilities of each subject; each row is called a capability list. The columns of Table 4.1 show the ACL for each object or application.
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URL://www.sciencedirect.com/science/article/pii/B9780128024379000047
1. An access control matrix, and its access control list and capability list representations
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A generalized temporal role based access control model for developing secure systems
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- Jan 2003
- James B. D. Joshi
A key issue in computer system security is to protect information against unauthorized access. Emerging workflow-based applications in healthcare, manufacturing, the financial sector, and e-commerce inherently have complex, time-based access control requirements. To address the diverse security needs of these applications, a Role Based Access Contr...
Access Control Lists
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DOI: //doi.org/10.1007/978-1-4419-5906-5_770
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