def get_required_iam_policy(self):
        """
        Return an IAM policy granting all of the permissions needed for
        awslimitchecker to fully function. This returns a dict suitable
        for json serialization to a valid IAM policy.

        Internally, this calls :py:meth:`~._AwsService.required_iam_permissions`
        on each :py:class:`~._AwsService` instance.

        :returns: dict representation of IAM Policy
        :rtype: dict
        """
        required_actions = [
            'support:*',
            'trustedadvisor:Describe*',
            'trustedadvisor:RefreshCheck'
        ]
        for cls in self.services.values():
            required_actions.extend(cls.required_iam_permissions())
        policy = {
            'Version': '2012-10-17',
            'Statement': [{
                'Effect': 'Allow',
                'Resource': '*',
                'Action': sorted(list(set(required_actions))),
            }],
        }
        return policy