acm-cert-renewal-30days: ACM Certificates Pre-expiration Renewal

id: acm-cert-renewal-30days
info:
  name: ACM Certificates Pre-expiration Renewal
  author: princechaddha
  severity: medium
  description: |
    Ensure AWS ACM SSL/TLS certificates are renewed at least 30 days before expiration to prevent service disruptions.
  impact: |
    Failure to renew certificates timely may lead to expired certificates causing service access issues or downtimes.
  remediation: |
    Set up Amazon CloudWatch to monitor ACM certificate expiration and automate renewal notifications or processes.
  reference:
    - https://docs.aws.amazon.com/acm/latest/userguide/acm-renewal.html
  metadata:
    max-request: 2
  tags: cloud,devops,aws,amazon,acm,aws-cloud-config
variables:
  region: "us-east-1"

flow: |
  code(1)
  for(let arns of iterate(template.certificatearns)){
    set("certificatearn", arns)
    code(2)
  }

self-contained: true
code:
  - engine:
      - sh
      - bash
    source: |
      aws acm list-certificates --region $region --certificate-statuses ISSUED --query 'CertificateSummaryList[*].CertificateArn' --output json

    extractors:
      - type: json
        name: certificatearns
        internal: true
        json:
          - '.CertificateSummaryList[] | .CertificateArn'

  - engine:
      - sh
      - bash
    source: |
         aws acm describe-certificate --region $region --certificate-arn $certificatearn --query 'Certificate.[NotAfter, CertificateArn]' --output json | jq -r 'select((.[0] | fromdateiso8601 | mktime) - (now | mktime) < (30 * 86400)) | .[1]'

    extractors:
      - type: regex # type of the extractor
        name: certificate
        internal: true
        regex:
          - '^arn.*'

      - type: dsl
        dsl:
          - '"The AWS ACM Certificate " + certificate +" is about to expire in 30 days"'
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