#!/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_check24="2.4"
CHECK_TITLE_check24="[check24] Ensure CloudTrail trails are integrated with CloudWatch Logs (Scored)"
CHECK_SCORED_check24="SCORED"
CHECK_TYPE_check24="LEVEL1"
CHECK_SEVERITY_check24="Low"
CHECK_ASFF_TYPE_check24="Software and Configuration Checks/Industry and Regulatory Standards/CIS AWS Foundations Benchmark"
CHECK_ASFF_RESOURCE_TYPE_check24="AwsCloudTrailTrail"
CHECK_ALTERNATE_check204="check24"
CHECK_ASFF_COMPLIANCE_TYPE_check24="ens-op.exp.8.aws.cw.1"
CHECK_SERVICENAME_check24="cloudtrail"
CHECK_RISK_check24='Sending CloudTrail logs to CloudWatch Logs will facilitate real-time and historic activity logging based on user; API; resource; and IP address; and provides opportunity to establish alarms and notifications for anomalous or sensitivity account activity.'
CHECK_REMEDIATION_check24='Validate that the trails in CloudTrail has an arn set in the CloudWatchLogsLogGroupArn property.'
CHECK_DOC_check24='https://docs.aws.amazon.com/awscloudtrail/latest/userguide/send-cloudtrail-events-to-cloudwatch-logs.html'
CHECK_CAF_EPIC_check24='Logging and Monitoring'

check24(){
  trail_count=0
  # "Ensure CloudTrail trails are integrated with CloudWatch Logs (Scored)"
  for regx in $REGIONS; do
    TRAILS_AND_REGIONS=$($AWSCLI cloudtrail describe-trails $PROFILE_OPT --region $regx --query 'trailList[*].{Name:TrailARN, HomeRegion:HomeRegion}' --output text 2>&1 | tr "	" ',')
    if [[ $(echo "$TRAILS_AND_REGIONS" | grep AccessDenied) ]]; then
      textFail "Access Denied trying to describe trails in $regx"
      continue
    fi
    if [[ $TRAILS_AND_REGIONS ]]; then
      for reg_trail in $TRAILS_AND_REGIONS; do
        TRAIL_REGION=$(echo $reg_trail | cut -d',' -f1)
        if [ $TRAIL_REGION != $regx ]; then # Only report trails once in home region
          continue
        fi
        trail=$(echo $reg_trail | cut -d',' -f2)
        trail_count=$((trail_count + 1))

        LATESTDELIVERY_TIMESTAMP=$($AWSCLI cloudtrail get-trail-status --name $trail $PROFILE_OPT --region $TRAIL_REGION --query 'LatestCloudWatchLogsDeliveryTime' --output text|grep -v None)
        if [[ ! $LATESTDELIVERY_TIMESTAMP ]];then
          textFail "$trail trail is not logging in the last 24h or not configured (it is in $TRAIL_REGION)"
        else
          LATESTDELIVERY_DATE=$(timestamp_to_date $LATESTDELIVERY_TIMESTAMP)
          HOWOLDER=$(how_older_from_today $LATESTDELIVERY_DATE)
          if [ $HOWOLDER -gt "1" ];then
            textFail "$trail trail is not logging in the last 24h or not configured (it is in $TRAIL_REGION)"
          else
            textPass "$trail trail has been logging during the last 24h (it is in $TRAIL_REGION)"
          fi
        fi

      done
    fi
  done
  if [[ $trail_count == 0 ]]; then
    textFail "No CloudTrail trails were found in the account"
  fi
}