#!/usr/bin/env bash

# Prowler - the handy cloud security tool (copyright 2018) 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_extra7143="7.143"
CHECK_TITLE_extra7143="[extra7143] Check if EFS have policies which allow access to everyone"
CHECK_SCORED_extra7143="NOT_SCORED"
CHECK_CIS_LEVEL_extra7143="EXTRA"
CHECK_SEVERITY_extra7143="Critical"
CHECK_ASFF_RESOURCE_TYPE_extra7143="AwsEFS"
CHECK_ALTERNATE_check7143="extra7143"
CHECK_SERVICENAME_extra7143="efs"
CHECK_RISK_extra7143='EFS accessible to everyone could expose sensitive data to bad actors'
CHECK_REMEDIATION_extra7143='Ensure efs has some policy but it does not have principle as *'
CHECK_DOC_extra7143='https://docs.aws.amazon.com/efs/latest/ug/access-control-block-public-access.html'
CHECK_CAF_EPIC_extra7143='Data Protection'

extra7143(){
  # "Check if EFS have policies which allow access to everyone (Not Scored) (Not part of CIS benchmark)"
  for regx in $REGIONS; do
  LIST_OF_EFS_IDS=$($AWSCLI efs describe-file-systems $PROFILE_OPT --region $regx --query FileSystems[*].FileSystemId --output text 2>&1|xargs -n1 )
  if [[ $(echo "$LIST_OF_EFS_IDS" | grep -E 'AccessDenied|UnauthorizedOperation|AuthorizationError') ]]; then
      textInfo "$regx: Access Denied trying to describe file systems" "$regx"
      continue
  fi
  if [[ $LIST_OF_EFS_IDS ]]; then
    for efsId in $LIST_OF_EFS_IDS;do
      EFS_POLICY_STATEMENTS=$($AWSCLI efs $PROFILE_OPT describe-file-system-policy --region $regx --file-system-id $efsId --output json --query Policy 2>&1)
      if [[ $EFS_POLICY_STATEMENTS == *PolicyNotFound* ]]; then
        textFail "$regx:  EFS: $efsId doesn't have any policy which means it grants full access to any client" "$regx" "$efsId"
      else
        EFS_POLICY_BAD_STATEMENTS=$(echo $EFS_POLICY_STATEMENTS | jq '. | fromjson' | jq '.Statement[] | select(.Effect=="Allow") | select(.Principal=="*" or .Principal.AWS=="*" or .Principal.CanonicalUser=="*")')
        if [[ $EFS_POLICY_BAD_STATEMENTS != "" ]]; then
          textFail "$regx: EFS $efsId has policy which allows access to everyone" "$regx" "$efsId"
        else
          textPass "$regx: EFS $efsId has policy which does not allow access to everyone" "$regx" "$efsId"
        fi
      fi
    done

  else
    textInfo "$regx: No EFS found" "$regx"
  fi
 done
}