#!/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_extra7193="7.193"
CHECK_TITLE_extra7193="[extra7193] Ensure default Internet Access from your Amazon AppStream fleet streaming instances should remain unchecked."
CHECK_SCORED_extra7193="NOT_SCORED"
CHECK_CIS_LEVEL_extra7193="EXTRA"
CHECK_SEVERITY_extra7193="Medium"
CHECK_ASFF_TYPE_extra7193="Software and Configuration Checks/Industry and Regulatory Standards/CIS AWS Foundations Benchmark"
CHECK_ASFF_RESOURCE_TYPE_extra7193="AmazonAppStream"
CHECK_ALTERNATE_check7193="extra7193"
CHECK_SERVICENAME_extra7193="appstream"
CHECK_RISK_extra7193="Default Internet Access from your fleet streaming instances should be controlled using a NAT gateway in the VPC."
CHECK_REMEDIATION_extra7193="Uncheck the default internet access for the AppStream Fleet."
CHECK_DOC_extra7193='https://docs.aws.amazon.com/appstream2/latest/developerguide/set-up-stacks-fleets.html'
CHECK_CAF_EPIC_extra7193="Infrastructure Security"

extra7193(){
  for regx in $REGIONS; do
    LIST_OF_FLEETS_WITH_DEFAULT_INTERNET_ACCESS_ENABLED=$("${AWSCLI}" appstream describe-fleets $PROFILE_OPT --region "${regx}" --query 'Fleets[?EnableDefaultInternetAccess==`true`].Arn' --output text 2>&1)
    if grep -q -E 'AccessDenied|UnauthorizedOperation|AuthorizationError|Could not connect to the endpoint URL|Connect timeout on endpoint URL' <<< "${LIST_OF_FLEETS_WITH_DEFAULT_INTERNET_ACCESS_ENABLED}"; then
        textInfo "${regx}: Access Denied trying to describe appstream fleet(s)" "${regx}"
        continue
    fi

    if [[ $LIST_OF_FLEETS_WITH_DEFAULT_INTERNET_ACCESS_ENABLED && $LIST_OF_FLEETS_WITH_DEFAULT_INTERNET_ACCESS_ENABLED != '[]' ]]; then
      for Arn in $LIST_OF_FLEETS_WITH_DEFAULT_INTERNET_ACCESS_ENABLED; do
        textFail "$regx: Fleet: ${Arn} has default internet access enabled." "$regx" "${Arn}"
      done
    else
      textPass "${regx}: No AppStream Fleets have default internet access enabled." "${regx}"
    fi

  done
}