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Ensure that the expiration date is set on all keys

Default Severity: medium

Explanation

Expiration Date is an optional Key Vault Key behavior and is not set by default.

Set when the resource will be become inactive.

Possible Impact

Long life keys increase the attack surface when compromised

Suggested Resolution

Set an expiration date on the vault key

Insecure Example

The following example will fail the azure-keyvault-ensure-key-expiry check. 

 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",
   ]
 }

Secure Example

The following example will pass the azure-keyvault-ensure-key-expiry check. 

 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",
   ]
 }