{
  "properties": {
    "displayName": "Keys should not be active for longer than the specified number of days",
    "policyType": "BuiltIn",
    "mode": "Microsoft.KeyVault.Data",
    "description": "Specify the number of days that a key should be active. Keys that are used for an extended period of time increase the probability that an attacker could compromise the key. As a good security practice, make sure that your keys have not been active longer than two years.",
    "metadata": {
      "version": "1.0.0-preview",
      "category": "Key Vault",
      "preview": true
    },
    "parameters": {
      "maximumValidityInDays": {
        "type": "Integer",
        "metadata": {
          "displayName": "The maximum validity period in days",
          "description": "Specify the maximum number of days a key can be valid for after activation."
        }
      },
      "effect": {
        "type": "String",
        "metadata": {
          "displayName": "Effect",
          "description": "'Audit' allows a non-compliant resource to be created, but flags it as non-compliant. 'Deny' blocks the resource creation. 'Disable' turns off the policy."
        },
        "allowedValues": [
          "Audit",
          "Deny",
          "Disabled"
        ],
        "defaultValue": "Audit"
      }
    },
     "policyRule": {
      "if": {
        "allOf": [
          {
            "field": "type",
            "equals": "Microsoft.KeyVault.Data/vaults/keys"
          },
          {
            "value": "[utcNow()]",
            "greater": "[addDays(if(empty(field('Microsoft.KeyVault.Data/vaults/keys/attributes.notBefore')), field('Microsoft.KeyVault.Data/vaults/keys/attributes.createdOn'), field('Microsoft.KeyVault.Data/vaults/keys/attributes.notBefore')), parameters('maximumValidityInDays'))]"
          }
        ]
      },
      "then": {
        "effect": "[parameters('effect')]"
      }
    }
  },
  "id": "/providers/Microsoft.Authorization/policyDefinitions/c26e4b24-cf98-4c67-b48b-5a25c4c69eb9",
  "name": "c26e4b24-cf98-4c67-b48b-5a25c4c69eb9"
}