#!/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_check22="2.2"
CHECK_TITLE_check22="[check22] Ensure CloudTrail log file validation is enabled"
CHECK_SCORED_check22="SCORED"
CHECK_CIS_LEVEL_check22="LEVEL2"
CHECK_SEVERITY_check22="Medium"
CHECK_ASFF_TYPE_check22="Software and Configuration Checks/Industry and Regulatory Standards/CIS AWS Foundations Benchmark"
CHECK_ASFF_RESOURCE_TYPE_check22="AwsCloudTrailTrail"
CHECK_ALTERNATE_check202="check22"
CHECK_ASFF_COMPLIANCE_TYPE_check22="ens-op.exp.10.aws.trail.1"
CHECK_SERVICENAME_check22="cloudtrail"
CHECK_RISK_check22='Enabling log file validation will provide additional integrity checking of CloudTrail logs. '
CHECK_REMEDIATION_check22='Ensure LogFileValidationEnabled is set to true for each trail.'
CHECK_DOC_check22='http://docs.aws.amazon.com/awscloudtrail/latest/userguide/cloudtrail-log-filevalidation-enabling.html'
CHECK_CAF_EPIC_check22='Logging and Monitoring'

check22(){
  for regx in $REGIONS
  do
    TRAILS_DETAILS=$($AWSCLI cloudtrail describe-trails $PROFILE_OPT --region $regx --query 'trailList[*].{Name:Name, HomeRegion:HomeRegion, Multiregion:IsMultiRegionTrail, LogFileValidation:LogFileValidationEnabled}' --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_HOME_REGION LOG_FILE_VALIDATION IS_MULTIREGION TRAIL_NAME
          do
            if [[ "${LOG_FILE_VALIDATION}" == "True" ]]
            then
              if [[ "${IS_MULTIREGION}" == "True" ]]
              then
                textPass "$regx: Multiregion trail ${TRAIL_NAME} configured from region ${TRAIL_HOME_REGION} log file validation enabled" "$regx" "$TRAIL_NAME"
              else
                textPass "$regx: Single region trail ${TRAIL_NAME} log file validation enabled" "$regx" "$TRAIL_NAME"
              fi
            else
              if [[ "${IS_MULTIREGION}" == "True" ]]
              then
                textFail "$regx: Multiregion trail ${TRAIL_NAME} configured from region ${TRAIL_HOME_REGION} log file validation disabled" "$regx" "$TRAIL_NAME"
              else
                textFail "$regx: Single region trail ${TRAIL_NAME} log file validation disabled" "$regx" "$TRAIL_NAME"
              fi
            fi
          done <<< "${REGION_TRAIL}"
      done
    else
      textPass "$regx: No trails found in the region" "$regx"
    fi
  done
}