I no longer believe that Satan's every action is taken with Divine permission. Satan may quite possibly be a free agent, acting on his own agenda beneath Divine soveriegnity, like most of us humans. The Idea that Satan does only what is permitted comes from passages in Job1;12, and Job2:6 where the God sets boundaries for the Satanic Torment of Job, and in Luke 22;31 where Jesus Informs Peter that Satan has asked for the right to "sift" him. Now, the Job thing looks to us, like a very civil discussion/debate. A wager. ("Job holds you in reverence and respect, but only because you take care of him. I'll bet if you let me kick his ass for a while, he will become bitter enough toward you to lose his temper") now the content here is so interesting, perhaps the greatest challenge is not to get off the subject, but anytime two parties with differing opinions agree to an experiment to see who is right, it is common to lay out some boundaries.
Mother says to Dad, "I'll bet junior will eat up the Haagen Daz Macadamia Brittle you have been hoarding within 2 days if you move it from the garage freezer and put in in the kitchen, next to the Mayfield vanilla.
Dad replies " You're on! but you must not remove the Mayfield nor withhold meals from junior."
What we see here is agreement on boundaries, not Mother being incapable of moving ice cream. To be sure, the average dad has the physical power to prevent mom from moving the Mayfield, but saying that is not the same thing as saying Mom takes no action without permission.
I am thinking that Satan has at least as much autonomy as we do. Choice is a prerequisite for evil, as well as love.