Remove check for whether localhost connection is root

We don't use this functionality internally and it's a potential
security liability if someone decides to set up their own internal
proxy to middlewared socket that's running as root.

src/middlewared/middlewared/plugins/auth.py

@@ -673,22 +673,6 @@ async def check_permission(middleware, app):
         await AuthService.session_manager.login(app, UnixSocketSessionManagerCredentials(user))
         return
 
-    if isinstance(origin, TCPIPOrigin):
-        if not (origin.addr.startswith('127.') or origin.addr == '::1'):
-            return
-
-        # This is an expensive operation, but it is only performed for localhost TCP connections which are rare
-        if process := await middleware.run_in_thread(get_peer_process, origin.addr, origin.port):
-            try:
-                euid = (await middleware.run_in_thread(process.uids)).effective
-            except psutil.NoSuchProcess:
-                pass
-            else:
-                if euid == 0:
-                    user = await middleware.call('auth.authenticate_root')
-                    await AuthService.session_manager.login(app, RootTcpSocketSessionManagerCredentials(user))
-                    return
-
 
 def setup(middleware):
     middleware.event_register('auth.sessions', 'Notification of new and removed sessions.')