Diagnosing and Fixing SurrealDB RBAC Misconfigurations: A Step‑by‑Step Guide

Problem Statement

When a SurrealDB user logs in but immediately receives a 403 Forbidden or sees data from other tenants, the root cause is almost always a mis‑configured role‑based access control (RBAC) setup. Common symptoms include:

• Authentication succeeds but privileged operations (e.g., CREATE, ALTER) fail.
• Real‑time subscriptions are denied even though the user can query the table manually.
• Data from unintended tenants appears in query results.

Cause & Diagnostic Table

Symptom	Likely Cause
403 on login	Missing or incorrect role assignment in users table
Unexpected data visibility	Over‑granting admin role or mis‑scoped tenant permissions
Failed schema ops	User lacks role:write or role hierarchy mis‑configured
Subscription denial	Subscriber role missing read privilege on target table
Silent denial on child role	Child role inherits from a parent that lacks needed privileges

Ordered Diagnostic Checks

1. Confirm User Credentials

   Log in with the suspect account via the console or client. If login succeeds, proceed to step 2.

2. Inspect Role Assignment

   Run:

   SELECT * FROM users WHERE name = 'test_user';
   

   Check the role field for a valid, existing role name. A NULL or misspelled role indicates a lookup failure.

3. Verify Role Privileges

   For the role identified:

   SELECT * FROM roles WHERE name = 'editor';
   

   Ensure the privileges array contains the required action (e.g., read, write, role:write). Missing entries will cause permission denials.

4. Check Role Inheritance (SurrealDB 1.6+)

   List inheritance:

   SELECT * FROM roles WHERE name = 'child_role';
   

   Confirm the inherits field references a parent role that actually grants the needed privileges. Inheritance syntax changed in 1.6; older scripts may silently fail.

5. Audit Tenant Scope

   Run a query that should be tenant‑restricted and verify the tenant column. If data from other tenants appears, review the role’s scope configuration.

6. Examine Audit Logs (if enabled)

   Search for denied operations tied to the user’s ID. Correlate timestamps with the steps above to pinpoint the exact privilege missing.

Corrective Actions Tied to Findings

• Missing or Incorrect Role

  Update the users table:

  UPDATE users SET role = 'editor' WHERE name = 'test_user';
  

  Ensure the role name is case‑exact.

• Insufficient Privileges

  Grant the missing privilege to the role:

  UPDATE roles SET privileges = array_append(privileges, 'read') WHERE name = 'editor';
  

  For schema changes, add role:write.

• Broken Inheritance

  Correct the inheritance chain:

  CREATE ROLE child_role INHERITS parent_role;
  

  Or modify the inherits field to reference the correct parent.

• Over‑Granting admin

  Revoke the admin role from non‑tenant accounts and re‑assign a least‑privilege role.

• Missing read on Subscriber

  Add the privilege:

  UPDATE roles SET privileges = array_append(privileges, 'read') WHERE name = 'subscriber';
  

Escalation Criteria

If after completing the above checks the issue persists:

• Verify that the SurrealDB instance is running the expected version (1.6+ for modern RBAC syntax).
• Confirm that audit logging is enabled; if not, enable it to capture denied operations.
• Contact SurrealDB support or consult the official documentation for version‑specific nuances.

Limitations & Practical Verification

• RBAC syntax changes in 1.6+ may cause legacy scripts to fail silently; always test in a staging environment.
• Role identifiers are case‑sensitive; a typo results in a NULL lookup and a 403 without a clear message.
• Least‑privilege enforcement is crucial; over‑granting admin can expose the entire database, so audit role assignments regularly.
• After applying changes, run a test operation (e.g., SELECT * FROM sensitive_table;) with the affected user to confirm success.