Fix BFLA (Broken Function Level Authorization) in Masonite
Broken Function Level Authorization (BFLA) in Masonite occurs when sensitive controller actions are exposed to users who lack the required administrative privileges. While the 'auth' middleware ensures a user is logged in, it does not verify their role. Attackers exploit this by directly hitting internal API endpoints or administrative routes, bypassing the UI restrictions and performing unauthorized state-changing operations.
The Vulnerable Pattern
# routes/web.py Route.post("/api/admin/delete-user/@id", "AdminController@delete").middleware('auth')app/controllers/AdminController.py
from masonite.controllers import Controller from masonite.request import Request from app.models.User import User
class AdminController(Controller): def delete(self, request: Request): # VULNERABILITY: Only checks if authenticated, not if the user is an admin user_id = request.param(‘id’) target_user = User.find(user_id) if target_user: target_user.delete() return {‘status’: ‘success’} return {‘status’: ‘not found’}, 404
The Secure Implementation
The fix involves moving from simple authentication to granular authorization. In the vulnerable example, any logged-in user can reach the delete method by guessing the ID. The secure implementation utilizes Masonite's 'Gate' facade to enforce Role-Based Access Control (RBAC). By defining an 'admin-only' policy and invoking 'Gate.denies()' at the start of the controller method, we ensure that even if the route is discovered, the execution is halted for non-privileged users. For scalable applications, it is recommended to wrap these checks into custom Middleware applied at the route level.
# app/providers/AuthServiceProvider.py (Define Gate)
from masonite.facades import Gate
def boot(self):
Gate.define(‘admin-only’, lambda user: user.is_admin == True)
app/controllers/AdminController.py
from masonite.controllers import Controller
from masonite.request import Request
from masonite.facades import Gate
from app.models.User import User
class AdminController(Controller):
def delete(self, request: Request):
# SECURE: Explicitly check authorization gate before execution
if Gate.denies(‘admin-only’):
return {‘error’: ‘Unauthorized access’}, 403
user_id = request.param('id')
target_user = User.find(user_id)
if target_user:
target_user.delete()
return {'status': 'user deleted'}
return {'status': 'not found'}, 404</code></pre>
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