Satan can only do what God allows him to do

Job 2:3-7: “And the Lord said to Satan, ‘Have you considered my servant Job, that there is none like him on the earth, a blameless and upright man, who fears God and turns away from evil?  He still holds fast his integrity, although you incited me against him to destroy him without reason.’ Then Satan answered the Lord and said, ‘Skin for skin! All that a man has he will give for his life. But stretch out your hand and touch his bone and his flesh, and he will curse you to your face.’ And the Lord said to Satan, ‘Behold, he is in your hand; only spare his life. So Satan went out from the presence of the Lord and struck Job with loathsome sores from the sole of his foot to the crown of his head.”