terraform.azure.security.keyvault.keyvault-ensure-key-expires.keyvault-ensure-key-expires

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Ensure that the expiration date is set on all keys

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Defintion

rules:
  - id: keyvault-ensure-key-expires
    message: Ensure that the expiration date is set on all keys
    patterns:
      - pattern: resource
      - pattern-not-inside: |
          resource "azurerm_key_vault_key" "..." {
          ...
          expiration_date = "..."
          ...
          }
      - pattern-inside: |
          resource "azurerm_key_vault_key" "..." {
          ...
          }
    metadata:
      cwe:
        - "CWE-262: Not Using Password Aging"
      category: security
      technology:
        - terraform
        - azure
      references:
        - https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/key_vault_key#expiration_date
        - https://docs.microsoft.com/en-us/powershell/module/az.keyvault/update-azkeyvaultkey?view=azps-5.8.0#example-1--modify-a-key-to-enable-it--and-set-the-expiration-date-and-tags
      subcategory:
        - vuln
      likelihood: LOW
      impact: MEDIUM
      confidence: MEDIUM
      license: Commons Clause License Condition v1.0[LGPL-2.1-only]
      vulnerability_class:
        - Improper Authentication
    languages:
      - hcl
    severity: INFO

Examples

keyvault-ensure-key-expires.tf

resource "azurerm_key_vault_key" "good_example" {
  name         = "generated-certificate"
  key_vault_id = azurerm_key_vault.example.id
  key_type     = "RSA"
  key_size     = 2048
  expiration_date = "1982-12-31T00:00:00Z"

  key_opts = [
    "decrypt",
    "encrypt",
    "sign",
    "unwrapKey",
    "verify",
    "wrapKey",
  ]
}

# ruleid: keyvault-ensure-key-expires
resource "azurerm_key_vault_key" "bad_example" {
  name         = "generated-certificate"
  key_vault_id = azurerm_key_vault.example.id
  key_type     = "RSA"
  key_size     = 2048

  key_opts = [
    "decrypt",
    "encrypt",
    "sign",
    "unwrapKey",
    "verify",
    "wrapKey",
  ]
}