#!/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_extra75="7.5"
CHECK_TITLE_extra75="[extra75] Ensure there are no Security Groups not being used"
CHECK_SCORED_extra75="NOT_SCORED"
CHECK_TYPE_extra75="EXTRA"
CHECK_SEVERITY_extra75="Informational"
CHECK_ASFF_RESOURCE_TYPE_extra75="AwsEc2SecurityGroup"
CHECK_ALTERNATE_extra705="extra75"
CHECK_ALTERNATE_check75="extra75"
CHECK_ALTERNATE_check705="extra75"
CHECK_ASFF_COMPLIANCE_TYPE_extra75="ens-mp.com.4.aws.sg.3"
CHECK_SERVICENAME_extra75="ec2"
CHECK_RISK_extra75='Having clear definition and scope for Security Groups creates a better administration environment.'
CHECK_REMEDIATION_extra75='List all the security groups and then use the cli to check if they are attached to an instance.'
CHECK_DOC_extra75='https://aws.amazon.com/premiumsupport/knowledge-center/ec2-find-security-group-resources/'
CHECK_CAF_EPIC_extra75='Infrastructure Security'

extra75(){
  # "Ensure there are no Security Groups not being used "
  for regx in $REGIONS; do
    SECURITYGROUPS=$($AWSCLI ec2 describe-security-groups $PROFILE_OPT --region $regx --max-items $MAXITEMS --output json | jq '.SecurityGroups|map({(.GroupId): (.GroupName)})|add')
    if [[ $SECURITYGROUPS == "null" ]];
    then
      continue
    fi
    LIST_OF_SECURITYGROUPS=$(echo $SECURITYGROUPS|jq -r 'to_entries|sort_by(.key)|.[]|.key')
    for SG_ID in $LIST_OF_SECURITYGROUPS; do
      SG_NOT_USED=$($AWSCLI ec2 describe-network-interfaces $PROFILE_OPT --region $regx --filters "Name=group-id,Values=$SG_ID" --query "length(NetworkInterfaces)" --output text)
      # Default security groups can not be deleted, so draw attention to them
      if [[ $SG_NOT_USED -eq 0 ]];then
        GROUP_NAME=$(echo $SECURITYGROUPS | jq -r --arg id $SG_ID '.[$id]')
        if [[ $GROUP_NAME != "default" ]];
        then
          textFail "$regx: $SG_ID is not being used!" "$regx" "$SG_ID"
        else
          textInfo "$regx: $SG_ID is not being used - default security group" "$regx" "$SG_ID"
        fi
      else
        textPass "$regx: $SG_ID is being used" "$regx" "$SG_ID"
      fi
    done
  done
}