The question is why u need the ministry of foreign affairs !!
the steps are as following :
1- Go to the Iraqi embassy and request the police certificate
2- they will take ur finger prints
3- they will send the document to Iraq (CID: Criminal Identification Department ),
4- the CID will give their clearance
5- The plolice certificate will be signed / stamped from the ministry of interior
6- then the police certificate either to be stamped by the Iraqi embassy or by the ministry of exterior
as far as i know this process will takes around 3 months and the Canadian embassy will tell u that this police certificate expired and u need to get new one