#!/usr/bin/env bash

# Prowler - the handy cloud security tool (copyright 2018) 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_extra715="7.15"
CHECK_TITLE_extra715="[extra715] Check if Amazon Elasticsearch Service (ES) domains have logging enabled"
CHECK_SCORED_extra715="NOT_SCORED"
CHECK_CIS_LEVEL_extra715="EXTRA"
CHECK_SEVERITY_extra715="Medium"
CHECK_ASFF_RESOURCE_TYPE_extra715="AwsElasticsearchDomain"
CHECK_ALTERNATE_check715="extra715"
CHECK_SERVICENAME_extra715="es"
CHECK_RISK_extra715='Amazon ES exposes four Elasticsearch logs through Amazon CloudWatch Logs: error logs; search slow logs; index slow logs; and audit logs. '
CHECK_REMEDIATION_extra715='Enable Elasticsearch log. Create use cases for them. Using audit logs check for access denied events.'
CHECK_DOC_extra715='https://docs.aws.amazon.com/elasticsearch-service/latest/developerguide/es-createdomain-configure-slow-logs.html'
CHECK_CAF_EPIC_extra715='Logging and Monitoring'

extra715(){
  for regx in $REGIONS; do
    LIST_OF_DOMAINS=$($AWSCLI es list-domain-names $PROFILE_OPT --region $regx --query 'DomainNames[].DomainName' --output text 2>&1)
    if [[ $(echo "$LIST_OF_DOMAINS" | grep -E 'AccessDenied|UnauthorizedOperation') ]]; then
        textInfo "$regx: Access Denied trying to list domain names" "$regx"
        continue
    fi
    if [[ $LIST_OF_DOMAINS ]]; then
      for domain in $LIST_OF_DOMAINS;do
        SLOWLOG_ENABLED=$($AWSCLI es describe-elasticsearch-domain-config --domain-name $domain $PROFILE_OPT --region $regx --query 'DomainConfig.LogPublishingOptions.Options.[SEARCH_SLOW_LOGS.Enabled, INDEX_SLOW_LOGS.Enabled]' --output text 2>&1)
        if [[ $(echo "$SLOWLOG_ENABLED" | grep -E 'AccessDenied|UnauthorizedOperation|AuthorizationError') ]]; then
            textInfo "$regx: Access Denied trying to get ES domain config for $domain" "$regx"
            continue
        fi
        read SEARCH_SLOWLOG_ENABLED INDEX_SLOWLOG_ENABLED <<< "$SLOWLOG_ENABLED" && {
          if [[ "${SEARCH_SLOWLOG_ENABLED,,}" == "true" ]];then
            textPass "$regx: Amazon ES domain $domain SEARCH_SLOW_LOGS enabled" "$regx" "$domain"
          else
            textFail "$regx: Amazon ES domain $domain SEARCH_SLOW_LOGS disabled!" "$regx" "$domain"
          fi
          if [[ "${INDEX_SLOWLOG_ENABLED,,}" == "true" ]];then
            textPass "$regx: Amazon ES domain $domain INDEX_SLOW_LOGS enabled" "$regx" "$domain"
          else
            textFail "$regx: Amazon ES domain $domain INDEX_SLOW_LOGS disabled!" "$regx" "$domain"
          fi
        }
      done
    else
      textInfo "$regx: No Amazon ES domain found" "$regx"
    fi
  done
}