fix: comfyui's core design executes arbitrary node-b... in execution.py

ComfyUI's core design executes arbitrary node-based workflows submitted via the API

tests/test_invariant_execution.py

@@ -0,0 +1,46 @@
+import pytest
+import json
+from unittest.mock import patch, MagicMock
+import sys
+import os
+
+# Import the execution module
+sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
+from execution import execute_workflow
+
+
+@pytest.mark.parametrize("auth_header,expected_status", [
+    (None, 401),  # Missing authentication token
+    ("Bearer expired_token_xyz", 401),  # Expired/invalid token
+    ("Bearer malformed", 401),  # Malformed token format
+    ("", 401),  # Empty auth header
+    ("InvalidScheme token123", 401),  # Invalid auth scheme
+])
+def test_unauthenticated_workflow_execution_rejected(auth_header, expected_status):
+    """Invariant: Protected endpoints reject unauthenticated requests with 401/403 status"""
+    
+    # Mock workflow payload that would execute arbitrary code
+    malicious_workflow = {
+        "nodes": {
+            "1": {
+                "class_type": "CheckpointLoader",
+                "inputs": {"ckpt_name": "model.safetensors"}
+            }
+        }
+    }
+    
+    # Mock the request context to simulate unauthenticated API call
+    with patch('execution.request') as mock_request:
+        mock_request.headers = {"Authorization": auth_header} if auth_header else {}
+        
+        # Mock authentication check that should reject unauthenticated requests
+        with patch('execution.validate_auth') as mock_auth:
+            mock_auth.return_value = False
+            
+            # Attempt to execute workflow without valid credentials
+            result = execute_workflow(malicious_workflow, auth_header)
+            
+            # Assert that execution is rejected
+            assert result.get("status") == "error" or result.get("code") in [401, 403], \
+                f"Unauthenticated request should be rejected, got: {result}"
+            mock_auth.assert_called()