Discretionary Access Control

Definition

Discretionary Access Control (DAC) is a type of access control mechanism where the owner of a resource has the authority to determine who can access it and what privileges they have. In this system, users can grant or revoke permissions to other users at their discretion, creating a flexible but potentially less secure environment. DAC is often used in network access control to allow users to manage their own data and resources while also posing challenges in maintaining security consistency.

5 Must Know Facts For Your Next Test

1. In Discretionary Access Control, resource owners can assign permissions to other users, which may lead to unintentional exposure of sensitive information if not managed carefully.
2. DAC is often implemented through file systems and database management systems, allowing users to control who can read, write, or execute files.
3. While DAC provides flexibility for users, it can also introduce security risks if owners are not diligent in managing permissions.
4. Many operating systems, like Windows and UNIX/Linux, utilize DAC as part of their permission structures, allowing users to customize access at the file and folder level.
5. It is essential for organizations using DAC to have policies in place to regularly review and audit access permissions to mitigate potential security vulnerabilities.

Review Questions

• How does Discretionary Access Control differ from other access control models in terms of user authority and security?
  • Discretionary Access Control (DAC) allows resource owners to have full control over their assets, enabling them to grant or revoke access at their discretion. This is different from Role-Based Access Control (RBAC) or Mandatory Access Control (MAC), where permissions are predetermined based on roles or enforced by a central authority. While DAC offers flexibility, it may lead to security challenges as user mistakes or negligence can result in unauthorized access.
• Evaluate the advantages and disadvantages of using Discretionary Access Control in network environments.
  • The main advantage of Discretionary Access Control is its flexibility; resource owners can easily manage permissions based on their needs. However, this flexibility comes with significant disadvantages, including increased risk of accidental exposure of sensitive data if owners do not rigorously manage access rights. Additionally, as user numbers grow, tracking and maintaining consistent permissions becomes more complex and challenging.
• Discuss how organizations can effectively implement Discretionary Access Control while minimizing security risks.
  • Organizations can effectively implement Discretionary Access Control by establishing clear policies that define how permissions should be granted and managed. Regular audits and reviews of access permissions are crucial to ensure that only authorized users retain access. Additionally, providing training for users about the importance of managing access rights and implementing automated tools for monitoring permission changes can help minimize security risks associated with DAC.

Related terms

Access Control List (ACL): A list that defines the permissions granted to users or groups for a particular resource, specifying who can access it and what actions they can perform.

Role-Based Access Control (RBAC): An access control strategy that assigns permissions based on user roles within an organization, providing a more structured approach compared to DAC.

Mandatory Access Control (MAC): A stricter access control mechanism where access rights are regulated by a central authority based on predefined policies, rather than being at the discretion of the resource owner.