#!/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_check21="2.1"
CHECK_TITLE_check21="[check21] Ensure CloudTrail is enabled in all regions"
CHECK_SCORED_check21="SCORED"
CHECK_CIS_LEVEL_check21="LEVEL1"
CHECK_SEVERITY_check21="High"
CHECK_ASFF_TYPE_check21="Software and Configuration Checks/Industry and Regulatory Standards/CIS AWS Foundations Benchmark"
CHECK_ASFF_RESOURCE_TYPE_check21="AwsCloudTrailTrail"
CHECK_ALTERNATE_check201="check21"
CHECK_ASFF_COMPLIANCE_TYPE_check21="ens-op.acc.7.aws.iam.1 ens-op.mon.1.aws.trail.1"
CHECK_SERVICENAME_check21="cloudtrail"
CHECK_RISK_check21='AWS CloudTrail is a web service that records AWS API calls for your account and delivers log files to you. The recorded information includes the identity of the API caller; the time of the API call; the source IP address of the API caller; the request parameters; and the response elements returned by the AWS service.'
CHECK_REMEDIATION_check21='Ensure Logging is set to ON on all regions (even if they are not being used at the moment.'
CHECK_DOC_check21='https://docs.aws.amazon.com/awscloudtrail/latest/userguide/cloudtrailconcepts.html#cloudtrail-concepts-management-events'
CHECK_CAF_EPIC_check21='Logging and Monitoring'

check21(){
  for regx in $REGIONS; do
    TRAILS_DETAILS=$($AWSCLI cloudtrail describe-trails $PROFILE_OPT --region $regx --query 'trailList[*].{Name:Name, HomeRegion:HomeRegion, Multiregion:IsMultiRegionTrail, 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 IS_MULTIREGION TRAIL_NAME
        do
          TRAIL_ON_OFF_STATUS=$(${AWSCLI} cloudtrail get-trail-status ${PROFILE_OPT} --region ${regx} --name ${TRAIL_ARN} --query IsLogging --output text)
          if [[ "$TRAIL_ON_OFF_STATUS" == "False"  ]]
          then
            if [[ "${IS_MULTIREGION}" == "True" ]]
            then
              textFail "$regx: Trail ${TRAIL_NAME} is multiregion configured from region "${TRAIL_HOME_REGION}" but it is not logging" "${regx}" "${TRAIL_NAME}"
            else
              textFail "$regx: Trail ${TRAIL_NAME} is not a multiregion trail and it is not logging" "${regx}" "${TRAIL_NAME}"
            fi
          elif [[ "$TRAIL_ON_OFF_STATUS" == "True"  ]]
          then
            if [[ "${IS_MULTIREGION}" == "True" ]]
            then
              textPass "$regx: Trail ${TRAIL_NAME} is multiregion configured from region "${TRAIL_HOME_REGION}" and it is logging" "${regx}" "${TRAIL_NAME}"
            else
              textFail "$regx: Trail ${TRAIL_NAME} is not a multiregion trail and it is logging" "${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
}