cis-4.6.1-ip-forwarding-enabled.sh

#!/bin/bash

source functions.inc

PROJECT_IDS="";
DEBUG="False";
HELP=$(cat << EOL
	$0 [-p, --project PROJECT] [-d, --debug] [-h, --help]	
EOL
);

for arg in "$@"; do
  shift
  case "$arg" in
    "--help") 		set -- "$@" "-h" ;;
    "--debug") 		set -- "$@" "-d" ;;
    "--project")   	set -- "$@" "-p" ;;
    *)        		set -- "$@" "$arg"
  esac
done

while getopts "hdp:" option
do 
    case "${option}"
        in
        p)
        	PROJECT_IDS=${OPTARG};;
        d)
        	DEBUG="True";;
        h)
        	echo $HELP; 
        	exit 0;;
    esac;
done;

if [[ $PROJECT_IDS == "" ]]; then
    declare PROJECT_IDS=$(gcloud projects list --format="flattened(PROJECT_ID)" | grep project_id | cut -d " " -f 2);
fi;

for PROJECT_ID in $PROJECT_IDS; do
    PROJECT_DETAILS=$(gcloud projects describe $PROJECT_ID --format="json");
	PROJECT_APPLICATION=$(echo $PROJECT_DETAILS | jq -rc '.labels.app');
	PROJECT_OWNER=$(echo $PROJECT_DETAILS | jq -rc '.labels.adid');
    	
	gcloud config set project $PROJECT_ID 2>/dev/null;

	if ! api_enabled compute.googleapis.com; then
		echo "Compute Engine API is not enabled on Project $PROJECT_ID"
		continue
	fi

	declare INSTANCES=$(gcloud compute instances list --quiet --format="json");

	if [[ $INSTANCES != "[]" ]]; then
	
		echo "---------------------------------------------------------------------------------";
		echo "Instances for Project $PROJECT_ID";
        echo "Project Application: $PROJECT_APPLICATION";
	    echo "Project Owner: $PROJECT_OWNER";
		echo "---------------------------------------------------------------------------------";

		echo $INSTANCES | jq -rc '.[]' | while IFS='' read -r INSTANCE;do

			NAME=$(echo $INSTANCE | jq -rc '.name');
			IP_FORWARDING_ENABLED=$(echo $INSTANCE | jq -rc '.canIpForward' | tr '[:upper:]' '[:lower:]');
			IS_GKE_NODE=$(echo $INSTANCE | jq '.labels' | jq 'has("goog-gke-node")');
			
			if [[ $IP_FORWARDING_ENABLED == "true"  && $IS_GKE_NODE == "false" ]]; then
				echo "Instance Name: $NAME";
				echo "IP Forwarding Configuration: $IP_FORWARDING_ENABLED";
				echo "VIOLATION: IP forwarding enabled"
				echo "";
			fi;
		done;
		echo "";
	else
		echo "No instances found for Project $PROJECT_ID";
		echo "";
	fi;
	sleep 0.5;
done;