Oregon has NOT adopted permitless ('constitutional') concealed carry. A valid Concealed Handgun License issued under ORS 166.291 and 166.292 is required to carry a concealed handgun on the person or to keep a concealed and readily accessible handgun in a vehicle. Open carry in a belt holster does not require a permit.
"a person commits the crime of unlawful possession of a firearm if the person knowingly: (a) Carries any firearm concealed upon the person; (b) Possesses a handgun that is concealed and readily accessible to the person within any vehicle."