#!/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.
Ensure no security groups 
CHECK_ID_extra7138="7.138"
CHECK_TITLE_extra7138="[extra7138] Ensure no Network ACLs allow ingress from 0.0.0.0/0 to any port"
CHECK_SCORED_extra7138="NOT SCORED"
CHECK_TYPE_extra7138="LEVEL2"
CHECK_SEVERITY_extra7138="High"
CHECK_ASFF_TYPE_extra7138="Software and Configuration Checks/Industry and Regulatory Standards/CIS AWS Foundations Benchmark"
CHECK_ASFF_RESOURCE_TYPE_extra7138="AwsEc2NetworkACLs"
CHECK_ALTERNATE_check7138="extra7138"
CHECK_SERVICENAME_extra7138="ec2"
CHECK_RISK_extra7138='Even having a perimeter firewall; having network acls open allows any user or malware with vpc access to scan for well known and sensitive ports and gain access to instance.'
CHECK_REMEDIATION_extra7138='Apply Zero Trust approach. Implement a process to scan and remediate unrestricted or overly permissive network acls. Recommended best practices is to narrow the definition for the minimum ports required.'
CHECK_DOC_extra7138=''
CHECK_CAF_EPIC_extra7138='Infrastructure Security'

extra7138(){
  for regx in $REGIONS; do
    NACL_LIST=$($AWSCLI ec2 describe-network-acls --query 'NetworkAcls[?Entries[?((!PortRange) && (CidrBlock == `0.0.0.0/0`) && (Egress == `false`) && (RuleAction == `allow`))]].{NetworkAclId:NetworkAclId}' $PROFILE_OPT --region $regx --output text)
    if [[ $NACL_LIST ]];then
      for NACL in $NACL_LIST;do
        textInfo "$regx: Found Network ACL: $NACL open to 0.0.0.0/0 for any port" "$regx"
      done
    else
      textPass "$regx: No Network ACL found with any port open to 0.0.0.0/0" "$regx"
    fi
  done
}