Rule 110.2 · Permanents
A permanent’s owner is the same as the owner of the card that represents it (unless it’s a token; see rule 111.2). A permanent’s controller is, by default, the player under whose control it entered the battlefield. Every permanent has a controller.
Subrules
If an effect instructs a player to put an object onto the battlefield, that object enters the battlefield under that player’s control unless the effect states otherwise.
If an effect causes a player to gain control of another player’s permanent spell, the first player controls the permanent that spell becomes, but the permanent’s controller by default is the player who put that spell onto the stack. (This distinction is relevant in multiplayer games; see rule 800.4c.)