SecureVault/firestore.rules at master · Abs449/SecureVault · GitHub

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rules_version = '2';
service cloud.firestore {
  match /databases/{database}/documents {
    // Users can only access their own data
    match /users/{userId} {
      // Allow read/write only if authenticated and accessing own data
      allow read, write: if request.auth != null && request.auth.uid == userId;

      // Config subcollection (stores salt)
      match /config/{document=**} {
        allow read, write: if request.auth != null && request.auth.uid == userId;
      }

      // Passwords subcollection (stores encrypted password entries)
      match /passwords/{passwordId} {
        allow read, write: if request.auth != null && request.auth.uid == userId;
      }
    }

    // Deny all other access
    match /{document=**} {
      allow read, write: if false;
    }
  }
}