How to Secure Customer's own Space with Spring Security In Banking App
In a banking application where each individual customer has their own realm of data (e.g., account info, transaction history), the traditional role-based security mechanism in Spring Security (e.g., ROLE_USER, ROLE_ADMIN) is not enough on its own to enforce access control at the data level.
✅ What Role-Based Security Does Well
Role-based access in Spring Security is great for:
Granting access to functional areas (e.g., only admins can access the admin dashboard).
Allowing or denying methods or endpoints based on the user’s role.
But your requirement needs ownership-based access control, or object-level security, not just role-level.
How to Satisfy “Only-Access-Own-Realm” in Spring Security
You’ll need to combine role-based security with fine-grained, ownership-based authorization logic.
✅ Step-by-Step Solution
1. Standard Authentication & Role Setup
You still define roles like this: