#!/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"
CHECK_SCORED_check24="SCORED"
CHECK_CIS_LEVEL_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(){
  for regx in $REGIONS; do
    TRAILS_DETAILS=$($AWSCLI cloudtrail describe-trails $PROFILE_OPT --region $regx --query 'trailList[*].{Name:Name, HomeRegion:HomeRegion, ARN:TrailARN}' --output text 2>&1)
    if [[ $(echo "$TRAILS_DETAILS" | grep AccessDenied) ]]; then
      textInfo "$regx: Access Denied trying to describe trails" "$regx"
      continue
    fi
    if [[ $TRAILS_DETAILS ]]
    then
      for REGION_TRAIL in "${TRAILS_DETAILS}"
      do
        while read -r TRAIL_ARN TRAIL_HOME_REGION TRAIL_NAME
        do
          LATESTDELIVERY_TIMESTAMP=$(${AWSCLI} cloudtrail get-trail-status ${PROFILE_OPT} --region ${regx} --name ${TRAIL_ARN} --query LatestCloudWatchLogsDeliveryTime --output text|grep -v None)
          if [[ ! $LATESTDELIVERY_TIMESTAMP ]];then
            textFail "$regx: $TRAIL_NAME trail is not logging in the last 24h or not configured (its home region is $TRAIL_HOME_REGION)" "$regx" "$trail"
          else
            LATESTDELIVERY_DATE=$(timestamp_to_date $LATESTDELIVERY_TIMESTAMP)
            HOWOLDER=$(how_older_from_today $LATESTDELIVERY_DATE)
            if [ $HOWOLDER -gt "1" ];then
              textFail "$regx: $TRAIL_NAME trail is not logging in the last 24h or not configured" "$regx" "$TRAIL_NAME"
            else
              textPass "$regx: $TRAIL_NAME trail has been logging during the last 24h" "$regx" "$TRAIL_NAME"
            fi
          fi
        done <<< "${REGION_TRAIL}"
      done
    else
      textFail "$regx: No CloudTrail trails were found for the region" "${regx}" "No trails found"
    fi
  done
}