#!/usr/bin/env bash

# Prowler - the handy cloud security tool (c) by Toni de la Fuente
#
# This Prowler check is licensed under a
# Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
#
# You should have received a copy of the license along with this
# work. If not, see <http://creativecommons.org/licenses/by-nc-sa/4.0/>.

CHECK_ID_check33="3.3,3.03"
CHECK_TITLE_check33="[check33] Ensure a log metric filter and alarm exist for usage of root account (Scored)"
CHECK_SCORED_check33="SCORED"
CHECK_ALTERNATE_check303="check33" 

check33(){
  # "Ensure a log metric filter and alarm exist for usage of root account (Scored)"
  CLOUDWATCH_GROUP=$($AWSCLI cloudtrail describe-trails $PROFILE_OPT --region $REGION --query 'trailList[*].CloudWatchLogsLogGroupArn' --output text | tr '	' '
' | awk -F: '{ print $7 }')
  if [[ $CLOUDWATCH_GROUP ]];then
    for group in $CLOUDWATCH_GROUP; do
      CLOUDWATCH_LOGGROUP_REGION=$($AWSCLI cloudtrail describe-trails $PROFILE_OPT --region $REGION --query 'trailList[*].CloudWatchLogsLogGroupArn' --output text | awk -F: '{ print $4 }')
      METRICFILTER_SET=$($AWSCLI logs describe-metric-filters --log-group-name $group $PROFILE_OPT --region $CLOUDWATCH_LOGGROUP_REGION |grep -E 'userIdentity.*Root.*AwsServiceEvent')
      if [[ $METRICFILTER_SET ]];then
        HAS_ALARM_ASSOCIATED=$($AWSCLI cloudwatch describe-alarms $PROFILE_OPT --region $CLOUDWATCH_LOGGROUP_REGION --query 'MetricAlarms[].MetricName' --output text | tr '[:upper:]' '[:lower:]'| grep -Ei 'userIdentity|Root|AwsServiceEvent')
        if [[ $HAS_ALARM_ASSOCIATED ]];then
          textPass "CloudWatch group $group found with metric filters and alarms set for usage of root account"
        else
          textFail "CloudWatch group $group found with metric filters but no alarms associated"
        fi
      else
        textFail "CloudWatch group $group found but no metric filters or alarms associated"
      fi
    done
  else
    textFail "No CloudWatch group found for CloudTrail events"
  fi
}