Rowling has created a 'war' between magicians who want to use their power for good, and those who want to use it for bad purposes. This theme can be traced back to the written stories of the Babylonians and Sumerians, 4000 years ago, and is probably even older than that.

Is it based on the Ipcress File? Who can tell. The plots and themes of novels are all part of literary culture. Writers can and often do rewrite common themes, giving the characters new names and making new settings. Shakespeare does this and so do writers since his time.