How to add permissions checks 'after the fact'

I have a great number of PHP classes which perform the business logic of my application, e.g.

class FileMaker{
  public function makeFile(){
    //some code here to make a file
  }
}

Now I need to add permissions checks to them. I want to avoid having to copy/paste $this->checkPermissions() or similar into every method in every class. What's the best way of achieving this?

I was thinking some kind of decorator pattern which could add permissions checks, e.g:

//decorator that can be used to check permissions
class PermissionsDecorator{
    private $ob;

    public function __construct($ob){
        $this->ob = $ob;
    }

    //magic method which is called when any function is called
    public function __call($name,$arguments){
        if($this->hasPermission(get_class($this->ob), $name)){
            call_user_func_array(array($this->ob,$name),$arguments);
        }else{
            throw new Exception('You do not have permission to perform this action.');
        }
    }

    public function hasPermission($class,$method){
        echo 'does the user have permission on '.$class.'->'.$method.'?<br/>';

        //do some logic here to work out whether the user has permission
        return true;
    }
}

The decorator above could apply to all classes because it uses the __call magic method, rather than specifying the exact methods to call. Then I could use code such as:

$fm = new PermissionsDecorator(new FileMaker());

This feels a bit 'hacky' to me though. Is there a standard way of doing this? Or will I just have to copy/paste permissions checks everywhere?