(security fix) - Enforce model access restrictions on Azure OpenAI route (#8888)

* fix(user_api_key_auth.py): Fixes https://github.com/BerriAI/litellm/issues/8780

security fix - enforce model access checks on azure routes

* test(test_user_api_key_auth.py): add unit testing

* test(test_openai_endpoints.py): add e2e test to ensure azure routes also run through model validation checks

litellm/proxy/auth/user_api_key_auth.py

@@ -8,6 +8,7 @@ Returns a UserAPIKeyAuth object if the API key is valid
 """
 
 import asyncio
+import re
 import secrets
 from datetime import datetime, timezone
 from typing import Optional, cast
@@ -279,6 +280,21 @@ def get_rbac_role(jwt_handler: JWTHandler, scopes: List[str]) -> str:
         return LitellmUserRoles.TEAM
 
 
+def get_model_from_request(request_data: dict, route: str) -> Optional[str]:
+
+    # First try to get model from request_data
+    model = request_data.get("model")
+
+    # If model not in request_data, try to extract from route
+    if model is None:
+        # Parse model from route that follows the pattern /openai/deployments/{model}/*
+        match = re.match(r"/openai/deployments/([^/]+)", route)
+        if match:
+            model = match.group(1)
+
+    return model
+
+
 async def _user_api_key_auth_builder(  # noqa: PLR0915
     request: Request,
     api_key: str,
@@ -807,7 +823,7 @@ async def _user_api_key_auth_builder(  # noqa: PLR0915
                 # the validation will occur when checking the team has access to this model
                 pass
             else:
-                model = request_data.get("model", None)
+                model = get_model_from_request(request_data, route)
                 fallback_models = cast(
                     Optional[List[ALL_FALLBACK_MODEL_VALUES]],
                     request_data.get("fallbacks", None),

tests/proxy_unit_tests/test_user_api_key_auth.py

@@ -930,3 +930,20 @@ def test_can_rbac_role_call_model_no_role_permissions():
         general_settings={"role_permissions": []},
         model="anthropic-claude",
     )
+
+
+@pytest.mark.parametrize(
+    "route, request_data, expected_model",
+    [
+        ("/v1/chat/completions", {"model": "gpt-4"}, "gpt-4"),
+        ("/v1/completions", {"model": "gpt-4"}, "gpt-4"),
+        ("/v1/chat/completions", {}, None),
+        ("/v1/completions", {}, None),
+        ("/openai/deployments/gpt-4", {}, "gpt-4"),
+        ("/openai/deployments/gpt-4", {"model": "gpt-4o"}, "gpt-4o"),
+    ],
+)
+def test_get_model_from_request(route, request_data, expected_model):
+    from litellm.proxy.auth.user_api_key_auth import get_model_from_request
+
+    assert get_model_from_request(request_data, route) == expected_model

tests/test_openai_endpoints.py

@@ -3,7 +3,7 @@
 import pytest
 import asyncio
 import aiohttp, openai
-from openai import OpenAI, AsyncOpenAI
+from openai import OpenAI, AsyncOpenAI, AzureOpenAI, AsyncAzureOpenAI
 from typing import Optional, List, Union
 import uuid
 
@@ -201,6 +201,14 @@ async def chat_completion_with_headers(session, key, model="gpt-4"):
         return raw_headers_json
 
 
+async def chat_completion_with_model_from_route(session, key, route):
+    url = "http://0.0.0.0:4000/chat/completions"
+    headers = {
+        "Authorization": f"Bearer {key}",
+        "Content-Type": "application/json",
+    }
+
+
 async def completion(session, key):
     url = "http://0.0.0.0:4000/completions"
     headers = {
@@ -288,12 +296,19 @@ async def test_chat_completion():
     make chat completion call
     """
     async with aiohttp.ClientSession() as session:
-        key_gen = await generate_key(session=session)
-        key = key_gen["key"]
-        await chat_completion(session=session, key=key)
-        key_gen = await new_user(session=session)
-        key_2 = key_gen["key"]
-        await chat_completion(session=session, key=key_2)
+        key_gen = await generate_key(session=session, models=["gpt-3.5-turbo"])
+        azure_client = AsyncAzureOpenAI(
+            azure_endpoint="http://0.0.0.0:4000",
+            azure_deployment="random-model",
+            api_key=key_gen["key"],
+            api_version="2024-02-15-preview",
+        )
+        with pytest.raises(openai.AuthenticationError) as e:
+            response = await azure_client.chat.completions.create(
+                model="gpt-4",
+                messages=[{"role": "user", "content": "Hello!"}],
+            )
+        assert "API Key not allowed to access model." in str(e)
 
 
 @pytest.mark.asyncio