rules:
- id: gcp-sql-database-ssl-insecure-value-postgres-mysql
  patterns:
  - pattern-inside: |
      resource "google_sql_database_instance" "..." {
          ...
          database_version = "$DB"
          ...
      }
  - pattern-inside: |
      resource "google_sql_database_instance" "..." {
          ...
          ip_configuration {
              ...
              ssl_mode = $VALUE
              ...
          }
          ...
      }
  - pattern-not-inside: |
      resource "google_sql_database_instance" "..." {
          ...
          ip_configuration {
              ...
              ssl_mode = "TRUSTED_CLIENT_CERTIFICATE_REQUIRED"
              ...
          }
          ...
      }
  - metavariable-regex:
      metavariable: $DB
      regex:  .*(MYSQL|POSTGRES).*
  - focus-metavariable: $VALUE
  fix: |
    "TRUSTED_CLIENT_CERTIFICATE_REQUIRED"
  message: >-
    Ensure all Cloud SQL database instance require incoming connections to use SSL. To enable this for PostgresSQL and MySQL, use `ssl_mode="TRUSTED_CLIENT_CERTIFICATE_REQUIRED"`.
  metadata:
    owasp:
    - A03:2017 - Sensitive Data Exposure
    - A02:2021 - Cryptographic Failures
    cwe:
    - 'CWE-326: Inadequate Encryption Strength'
    category: security
    technology:
    - terraform
    - gcp
    references:
    - "https://cloud.google.com/sql/docs/postgres/admin-api/rest/v1/instances#ipconfiguration"
    - "https://owasp.org/Top10/A02_2021-Cryptographic_Failures"
    subcategory:
    - vuln
    likelihood: LOW
    impact: MEDIUM
    confidence: MEDIUM
  languages: [hcl]
  severity: WARNING