#!/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_check42="4.2"
CHECK_TITLE_check42="[check42] Ensure no security groups allow ingress from 0.0.0.0/0 or ::/0 to port 3389 (Scored)"
CHECK_SCORED_check42="SCORED"
CHECK_TYPE_check42="LEVEL2"
CHECK_SEVERITY_check42="High"
CHECK_ASFF_TYPE_check42="Software and Configuration Checks/Industry and Regulatory Standards/CIS AWS Foundations Benchmark"
CHECK_ASFF_RESOURCE_TYPE_check42="AwsEc2SecurityGroup"
CHECK_ALTERNATE_check402="check42"
CHECK_ASFF_COMPLIANCE_TYPE_check42="ens-mp.com.4.aws.sg.5"
CHECK_SERVICENAME_check42="ec2"
CHECK_RISK_check42='Even having a perimeter firewall; having security groups open allows any user or malware with vpc access to scan for well known and sensitive ports and gain access to instance.'
CHECK_REMEDIATION_check42='Apply Zero Trust approach. Implement a process to scan and remediate unrestricted or overly permissive security groups. Recommended best practices is to narrow the definition for the minimum ports required.'
CHECK_DOC_check42='https://docs.aws.amazon.com/eks/latest/userguide/sec-group-reqs.html'
CHECK_CAF_EPIC_check42='Infrastructure Security'

check42(){
  # "Ensure no security groups allow ingress from 0.0.0.0/0 or ::/0 to port 3389 (Scored)"
  for regx in $REGIONS; do
    SG_LIST=$($AWSCLI ec2 describe-security-groups --query 'SecurityGroups[?length(IpPermissions[?((FromPort==null && ToPort==null) || (FromPort<=`3389` && ToPort>=`3389`)) && (contains(IpRanges[].CidrIp, `0.0.0.0/0`) || contains(Ipv6Ranges[].CidrIpv6, `::/0`))]) > `0`].{GroupId:GroupId}' $PROFILE_OPT --region $regx --output text)
    if [[ $SG_LIST ]];then
      for SG in $SG_LIST;do
        textFail "Found Security Group: $SG open to 0.0.0.0/0 in Region $regx" "$regx" "$SG"
      done
    else
      textPass "No Security Groups found in $regx with port 3389 TCP open to 0.0.0.0/0" "$regx"
    fi
  done
}