// Authorizes the ingress rule on the db security group
func resourceAwsDbSecurityGroupAuthorizeRule(ingress interface{}, dbSecurityGroupName string, conn *rds.RDS) error {
	ing := ingress.(map[string]interface{})

	opts := rds.AuthorizeDBSecurityGroupIngressMessage{
		DBSecurityGroupName: aws.String(dbSecurityGroupName),
	}

	if attr, ok := ing["cidr"]; ok && attr != "" {
		opts.CIDRIP = aws.String(attr.(string))
	}

	if attr, ok := ing["security_group_name"]; ok && attr != "" {
		opts.EC2SecurityGroupName = aws.String(attr.(string))
	}

	if attr, ok := ing["security_group_id"]; ok && attr != "" {
		opts.EC2SecurityGroupID = aws.String(attr.(string))
	}

	if attr, ok := ing["security_group_owner_id"]; ok && attr != "" {
		opts.EC2SecurityGroupOwnerID = aws.String(attr.(string))
	}

	log.Printf("[DEBUG] Authorize ingress rule configuration: %#v", opts)

	_, err := conn.AuthorizeDBSecurityGroupIngress(&opts)

	if err != nil {
		return fmt.Errorf("Error authorizing security group ingress: %s", err)
	}

	return nil
}