Shutdown without sudo user password in ubuntu

Shutdown without sudo user password in ubuntu

I'm setting up a minimalistic ubuntu based system with openbox as a window manager. Unlike the more full functioned window managers, there's no single click shutdown option. While i can shutdown using cli - this needs me to use sudo, and well, this isn't what i want. Is there any way to make the halt or poweroff commands work for any user, without the need for a password?