#!/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_extra739="7.39"
CHECK_TITLE_extra739="[extra739] Check if RDS instances have backup enabled"
CHECK_SCORED_extra739="NOT_SCORED"
CHECK_CIS_LEVEL_extra739="EXTRA"
CHECK_SEVERITY_extra739="Medium"
CHECK_ASFF_RESOURCE_TYPE_extra739="AwsRdsDbInstance"
CHECK_ALTERNATE_check739="extra739"
CHECK_SERVICENAME_extra739="rds"
CHECK_RISK_extra739='If backup is not enabled; data is vulnerable. Human error or bad actors could erase or modify data.'
CHECK_REMEDIATION_extra739='Enable automated backup for production data. Define a retention period and periodically test backup restoration. A Disaster Recovery process should be in place to govern Data Protection approach.'
CHECK_DOC_extra739='https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_WorkingWithAutomatedBackups.html'
CHECK_CAF_EPIC_extra739='Data Protection'

extra739(){
  for regx in $REGIONS; do
    LIST_OF_RDS_INSTANCES=$($AWSCLI rds describe-db-instances $PROFILE_OPT --region $regx --query 'DBInstances[*].DBInstanceIdentifier' --output text 2>&1)
    if [[ $(echo "$LIST_OF_RDS_INSTANCES" | grep -E 'AccessDenied|UnauthorizedOperation|AuthorizationError') ]]; then
        textInfo "$regx: Access Denied trying to describe DB instances" "$regx"
        continue
    fi 
    if [[ $LIST_OF_RDS_INSTANCES ]];then
      for rdsinstance in $LIST_OF_RDS_INSTANCES; do
        # if retention is 0 then is disabled
        BACKUP_RETENTION=$($AWSCLI rds describe-db-instances $PROFILE_OPT --region $regx --db-instance-identifier $rdsinstance --query 'DBInstances[*].BackupRetentionPeriod' --output text)
        if [[ $BACKUP_RETENTION == "0" ]]; then
          textFail "$regx: RDS instance $rdsinstance has not backup enabled!" "$regx" "$rdsinstance"
        else
          textPass "$regx: RDS instance $rdsinstance has backup enabled with retention period $BACKUP_RETENTION days" "$regx" "$rdsinstance"
        fi
      done
    else
      textInfo "$regx: No RDS instances found" "$regx" "$rdsinstance"
    fi
  done
}