#!/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.

DAYS_TO_EXPIRE_THRESHOLD="7"

CHECK_ID_extra730="7.30"
CHECK_TITLE_extra730="[extra730] Check if ACM Certificates are about to expire in $DAYS_TO_EXPIRE_THRESHOLD days or less"
CHECK_SCORED_extra730="NOT_SCORED"
CHECK_CIS_LEVEL_extra730="EXTRA"
CHECK_SEVERITY_extra730="High"
CHECK_ASFF_RESOURCE_TYPE_extra730="AwsCertificateManagerCertificate"
CHECK_ALTERNATE_check730="extra730"
CHECK_SERVICENAME_extra730="acm"
CHECK_RISK_extra730='Expired certificates can impact service availability.'
CHECK_REMEDIATION_extra730='Monitor certificate expiration and take automated action to renew; replace or remove. Having shorter TTL for any security artifact is a general recommendation; but requires additional automation in place. If not longer required delete certificate. Use AWS config using the managed rule: acm-certificate-expiration-check.'
CHECK_DOC_extra730='https://docs.aws.amazon.com/config/latest/developerguide/acm-certificate-expiration-check.html'
CHECK_CAF_EPIC_extra730='Data Protection'

extra730(){
  # Only RSA key types, needed to recover Amazon Issued, Imported and Private PKIs
  local ACM_KEY_TYPES="RSA_1024,RSA_2048,RSA_3072,RSA_4096"
  local ACM_CERTIFICATE_STATUSES="ISSUED"

  # "Check if ACM Certificates are about to expire in $DAYS_TO_EXPIRE_THRESHOLD days or less"
  for regx in $REGIONS; do
    LIST_OF_ACM_CERTS=$("${AWSCLI}" acm list-certificates ${PROFILE_OPT} --region "${regx}" --include keyTypes="${ACM_KEY_TYPES}" --certificate-statuses "${ACM_CERTIFICATE_STATUSES}" --query 'CertificateSummaryList[].CertificateArn' --output text)
    if [[ $LIST_OF_ACM_CERTS ]]; then
      for cert in $LIST_OF_ACM_CERTS; do
        CERT_DATA=$("${AWSCLI}" acm describe-certificate ${PROFILE_OPT} --region "${regx}" --certificate-arn "${cert}" --query 'Certificate.[DomainName,NotAfter]' --output text)
        # Format: domain.test.com YYYY-MM-DDTHH:MM:SS
        echo "$CERT_DATA" | while read -r FQDN NOTAFTER; do
          EXPIRES_DATE=$(timestamp_to_date "${NOTAFTER}")
          if [[ "${EXPIRES_DATE}" == "" ]]
          then
            textInfo "${regx}: Certificate for ${FQDN} has an incorrect timestamp format: ${NOTAFTER}" "${regx}" "${FQDN}"
          else
            COUNTER_DAYS=$(how_many_days_from_today "${EXPIRES_DATE}")
            if [[ $COUNTER_DAYS -le $DAYS_TO_EXPIRE_THRESHOLD ]]; then
              textFail "${regx}: Certificate for ${FQDN} is about to expire in ${COUNTER_DAYS} days!" "${regx}" "${FQDN}"
            else
              textPass "${regx}: Certificate for ${FQDN} expires in ${COUNTER_DAYS} days" "${regx}" "{$FQDN}"
            fi
          fi
        done
      done
    else
      textInfo "${regx}: No certificates found" "${regx}"
    fi
  done
}