Do not log private method calls initialized by systemd

src/middlewared/middlewared/api/base/server/ws_handler/rpc.py

@@ -273,13 +273,24 @@ async def process_message(self, app: RpcWebSocketApp, message: Any):
         if method is None:
             app.send_error(id_, JSONRPCError.METHOD_NOT_FOUND.value, "Method does not exist")
             return
-        if not app.private_methods and method.private:
+        if not app.private_methods and method.private and not self._can_call_private_methods(app):
             # FIXME: Eventually, prohibit this
-            self.middleware.logger.warning("Private method %r called on a connection without private_methods  "
+            self.middleware.logger.warning("Private method %r called on a connection without private_methods "
                                            "enabled", method.name)
 
         asyncio.ensure_future(self.process_method_call(app, id_, method, message.get("params", [])))
 
+    def _can_call_private_methods(self, app: RpcWebSocketApp):
+        if app.origin.uid == 33:
+            # Proxied HexOS calls
+            return False
+
+        if app.origin.loginuid() is None:
+            # System-initiated calls to `midclt`
+            return True
+
+        return False
+
     async def process_method_call(self, app: RpcWebSocketApp, id_: Any, method: Method, params: list):
         try:
             async with app.softhardsemaphore:

src/middlewared/middlewared/utils/origin.py

@@ -1,4 +1,5 @@
 from dataclasses import dataclass
+from functools import cached_property
 from socket import AF_INET, AF_INET6, AF_UNIX, SO_PEERCRED, SOL_SOCKET
 from struct import calcsize, unpack
 
@@ -97,6 +98,21 @@ def is_ha_connection(self) -> bool:
             self.rem_addr and self.rem_addr in HA_HEARTBEAT_IPS
         )
 
+    def loginuid(self) -> int | None:
+        if self.pid is None:
+            return None
+
+        try:
+            with open(f"/proc/{self.pid}/loginuid") as f:
+                loginuid = int(f.read())
+        except (FileNotFoundError, ValueError):
+            return None
+
+        if loginuid == 4294967295:
+            return None
+
+        return loginuid
+
 
 def get_tcp_ip_info(sock, request) -> tuple:
     # All API connections are terminated by nginx reverse