Granular Control & Access Policies
Learn how to implement secure, scalable permission systems using modern access control methodologies.
1. Access Control Models
RBAC (Role-Based)
Assign permissions to roles, then assign roles to users:
admin.role → full-access
ABAC (Attribute-Based)
Context-aware permissions based on attributes:
(user.role == "editor" AND document.type == "draft")
ACL (Access Control List)
File/directory level permissions:
/confidential → read: [user123, manager456]
2. Permission Lifecycle
Request Validation
if (!hasPermission(user, 'write', document)) {
throw new AccessDeniedError('Missing write permissions');
}
Inheritance Hierarchy
- Department (read-only)
- Manager Group (write)
- User John (admin)
3. Security Patterns
Least Privilege Principle
Grant minimal permissions necessary for any operation. Always verify against the smallest scope.
require('write')
Granular action permission for documents
allow('read')
General read access for public resources