use trusted header to get the user id instead of authentication; fix #69

mlflow_oidc_auth/auth.py

@@ -8,6 +8,8 @@
 
 from mlflow_oidc_auth.config import config
 from mlflow_oidc_auth.store import store
+from mlflow_oidc_auth.user import create_user 
+from mlflow.exceptions import MlflowException
 
 
 _oauth_instance: Optional[OAuth] = None
@@ -77,3 +79,17 @@ def authenticate_request_bearer_token() -> Union[Authorization, Response]:
     except Exception as e:
         app.logger.debug("JWT auth failed")
         return False
+
+
+def login_with_trusted_header():
+    from mlflow_oidc_auth.app import app
+
+    email = request.headers.get(config.TRUSTED_USER_ID_HEADER)
+    if not email:
+        return False
+    try:
+        create_user(username=email, display_name=email, is_admin=False)
+        app.logger.debug("User %s logged in for first time -> created", email)
+    except MlflowException as e:
+        app.logger.debug(f"User {email} logged in for first time but could no be created")
+    return True

mlflow_oidc_auth/config.py

@@ -26,6 +26,8 @@ def __init__(self):
         self.OIDC_REDIRECT_URI = os.environ.get("OIDC_REDIRECT_URI", None)
         self.OIDC_CLIENT_ID = os.environ.get("OIDC_CLIENT_ID", None)
         self.OIDC_CLIENT_SECRET = os.environ.get("OIDC_CLIENT_SECRET", None)
+        self.USE_TRUSTED_USER_ID_HEADER = os.environ.get("USE_TRUSTED_USER_ID_HEADER", str(False)).lower() in ("true", "1", "t")
+        self.TRUSTED_USER_ID_HEADER = os.environ.get("TRUSTED_USER_ID_HEADER", None)
 
         # session
         self.SESSION_TYPE = os.environ.get("SESSION_TYPE", "cachelib")

mlflow_oidc_auth/hooks/before_request.py

@@ -51,7 +51,7 @@
 
 import mlflow_oidc_auth.responses as responses
 from mlflow_oidc_auth import routes
-from mlflow_oidc_auth.auth import authenticate_request_basic_auth, authenticate_request_bearer_token
+from mlflow_oidc_auth.auth import authenticate_request_basic_auth, authenticate_request_bearer_token, login_with_trusted_header
 from mlflow_oidc_auth.config import config
 from mlflow_oidc_auth.utils import get_is_admin
 from mlflow_oidc_auth.validators import (
@@ -185,21 +185,26 @@ def before_request_hook():
     the view function for the matched route is called and returns a response"""
     if _is_unprotected_route(request.path):
         return
-    if request.authorization is not None:
+
+    if config.USE_TRUSTED_USER_ID_HEADER:
+        if not login_with_trusted_header():
+            return responses.make_auth_required_response()
+    elif request.authorization is not None:
         if request.authorization.type == "basic":
             if not authenticate_request_basic_auth():
                 return responses.make_basic_auth_response()
         if request.authorization.type == "bearer":
             if not authenticate_request_bearer_token():
                 return responses.make_auth_required_response()
-    else:
-        if session.get("username") is None:
-            session.clear()
-            return render_template(
-                "auth.html",
-                username=None,
-                provide_display_name=config.OIDC_PROVIDER_DISPLAY_NAME,
-            )
+        else:
+            return responses.make_auth_required_response()
+    elif session.get("username") is None:
+        session.clear()
+        return render_template(
+            "auth.html",
+            username=None,
+            provide_display_name=config.OIDC_PROVIDER_DISPLAY_NAME,
+        )
     # admins don't need to be authorized
     if get_is_admin():
         return

mlflow_oidc_auth/utils.py

@@ -49,6 +49,10 @@ def get_username():
             username = validate_token(request.authorization.token).get("email")
             app.logger.debug(f"Username from bearer token: {username}")
             return username
+        if config.TRUSTED_USER_ID_HEADER:
+            username = request.headers.get(config.TRUSTED_USER_ID_HEADER)
+            app.logger.debug(f"Username from trusted header {config.TRUSTED_USER_ID_HEADER}: {username}")
+            return username
     return None