Laminas Permissions: ACL vs RBAC for Resource-Specific Constraints

When implementing a 'deny-by-default' security posture in a Laminas (formerly Zend) application, the choice between Laminas\Permissions\Acl and Laminas\Permissions\Rbac impacts how public access is accidentally prevented during scaling.

ACL provides granular control by mapping specific privileges to individual resources, which is ideal for complex, non-hierarchical permission sets. Conversely, RBAC simplifies administration by grouping permissions into roles, making it more scalable for organizational structures but potentially less precise for unique resource constraints.

A specific uncertainty arises when managing deep role hierarchies where parent and child roles may have conflicting permission definitions, potentially leading to unintended access if the inheritance logic is not explicitly managed.

• Which approach better minimizes the risk of 'fail-open' scenarios in a multi-tenant environment?
• How does the inheritance behavior in RBAC differ from ACL when a child role must explicitly override a parent's 'allow' rule to maintain a strict deny-by-default state?