gcloud-sql-ssl-not-enforced: SSL/TLS Not Enforced for Cloud SQL Incoming Connections

id: gcloud-sql-ssl-not-enforced

info:
  name: SSL/TLS Not Enforced for Cloud SQL Incoming Connections
  author: princechaddha
  severity: medium
  description: |
    Enforce all incoming connections to your Cloud SQL database instances to use SSL/TLS only. If the SSL/TLS protocol is not enforced for all Cloud SQL connections, clients without a valid certificate are allowed to connect to the database, leading to potential security vulnerabilities.
  impact: |
    Without SSL/TLS enforcement, Cloud SQL database connections are vulnerable to eavesdropping, tampering, and impersonation attacks, posing a significant security risk.
  remediation: |
    Enable SSL/TLS for all incoming connections to your Cloud SQL instances. Update the SSL_MODE configuration to allow only encrypted connections.
  reference:
    - https://cloud.google.com/sql/docs/mysql/configure-ssl-instance
  tags: cloud,devops,gcp,gcloud,google-cloud-sql,gcp-cloud-config

flow: |
  code(1)
  for(let projectId of iterate(template.projectIds)){
    set("projectId", projectId)
    code(2)
    for(let sqlInstance of iterate(template.sqlInstances)){
      set("sqlInstance", sqlInstance)
      code(3)
    }
  }

self-contained: true

code:
  - engine:
      - sh
      - bash
    source: |
      gcloud projects list --format="json(projectId)"

    extractors:
      - type: json
        name: projectIds
        internal: true
        json:
          - '.[].projectId'

  - engine:
      - sh
      - bash
    source: |
      gcloud sql instances list --project $projectId --format="json(name)"

    extractors:
      - type: json
        name: sqlInstances
        internal: true
        json:
          - '.[].name'

  - engine:
      - sh
      - bash
    source: |
      gcloud sql instances describe $sqlInstance --format="json(settings.ipConfiguration.sslMode)"

    matchers:
      - type: word
        words:
          - 'ALLOW_UNENCRYPTED_AND_ENCRYPTED'

    extractors:
      - type: dsl
        dsl:
          - '"SSL/TLS Not Enforced for incoming connections on Cloud SQL instance " + sqlInstance + " in project " + projectId'
# digest: 4a0a004730450221009d6b418d54ee98301191a173b76f193e7bfd1d6775c233720d29448898110586022076dbb04c837c0aa5d7c725d5bf95e1d6b887d193a6f9d19a37fe134b923f4c81:922c64590222798bb761d5b6d8e72950