#!/usr/bin/env bash

# Prowler - the handy cloud security tool (copyright 2019) by Toni de la Fuente
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not
# use this file except in compliance with the License. You may obtain a copy
# of the License at http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software distributed
# under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
# CONDITIONS OF ANY KIND, either express or implied. See the License for the
# specific language governing permissions and limitations under the License.

CHECK_ID_check44="4.4"
CHECK_TITLE_check44="[check44] Ensure routing tables for VPC peering are \"least access\" (Not Scored)"
CHECK_SCORED_check44="NOT_SCORED"
CHECK_TYPE_check44="LEVEL2"
CHECK_SEVERITY_check44="Medium"
CHECK_ASFF_TYPE_check44="Software and Configuration Checks/Industry and Regulatory Standards/CIS AWS Foundations Benchmark"
CHECK_ASFF_RESOURCE_TYPE_check44="AwsEc2Vpc"
CHECK_ALTERNATE_check404="check44"
CHECK_SERVICENAME_check44="vpc"
CHECK_RISK_check44='Being highly selective in peering routing tables is a very effective way of minimizing the impact of breach as resources outside of these routes are inaccessible to the peered VPC.'
CHECK_REMEDIATION_check44='Review routing tables of peered VPCs for whether they route all subnets of each VPC and whether that is necessary to accomplish the intended purposes for peering the VPCs.'
CHECK_DOC_check44='https://docs.aws.amazon.com/vpc/latest/peering/peering-configurations-partial-access.html'
CHECK_CAF_EPIC_check44='Infrastructure Security'

check44(){
  # "Ensure routing tables for VPC peering are \"least access\" (Not Scored)"
  textInfo "Looking for VPC peering in all regions...  "
  for regx in $REGIONS; do
    LIST_OF_VPCS_PEERING_CONNECTIONS=$($AWSCLI ec2 describe-vpc-peering-connections --output text $PROFILE_OPT --region $regx --query 'VpcPeeringConnections[*].VpcPeeringConnectionId'| sort | paste -s -d" " -)
    if [[ $LIST_OF_VPCS_PEERING_CONNECTIONS ]];then
      textInfo "$regx: $LIST_OF_VPCS_PEERING_CONNECTIONS - review routing tables" "$regx"
      #LIST_OF_VPCS=$($AWSCLI ec2 describe-vpcs $PROFILE_OPT --region $regx --query 'Vpcs[*].VpcId' --output text)
      #aws ec2 describe-route-tables --filter "Name=vpc-id,Values=vpc-0213e864" --query "RouteTables[*].{RouteTableId:RouteTableId, VpcId:VpcId, Routes:Routes, AssociatedSubnets:Associations[*].SubnetId}" $PROFILE_OPT --region $regx
      # for vpc in $LIST_OF_VPCS; do
      #   VPCS_WITH_PEERING=$($AWSCLI ec2 describe-route-tables --filter "Name=vpc-id,Values=$vpc" $PROFILE_OPT --region $regx --query "RouteTables[*].{RouteTableId:RouteTableId, VpcId:VpcId, Routes:Routes, AssociatedSubnets:Associations[*].SubnetId}" |grep GatewayId|grep pcx-)
      # done
      #echo $VPCS_WITH_PEERING
    else
      textPass "$regx: No VPC peering found" "$regx"
    fi
  done
}