Control: 8.1 Ensure that the expiration date is set on all keys

Description

It is recommended that all keys in Azure Key Vault have an expiration time set. Azure Key Vault enables users to store and use cryptographic keys within the Microsoft Azure environment. The exp (expiration time) attribute identifies the expiration time on or after which the key MUST NOT be used for a cryptographic operation.

As default, keys never expire. It is thus recommended that keys be rotated in the key vault and set an explicit expiration time for all keys.

Remediation

From Console

Login and go to Key vaults.
For each Key vault, go to Settings section and click on Keys.
Make sure Status is Enabled.
Set an appropriate Expiration Date on all keys.

From Command Line

Command to update the Expiration Date for the key

az keyvault key set-attributes --name <keyName> --vault-name <vaultName> -- expires Y-m-d'T'H:M:S'Z'

Note

In order to access expiration time on all keys in Azure Key Vault using Microsoft API requires List Key permission
By default, keys do not expire
To provide required access follow below steps
- Go to Key vaults
- For each Key vault, click on Access Policy
- Add access policy with Key permission as List

Usage

Run the control in your terminal:

powerpipe control run azure_compliance.control.cis_v130_8_1

Snapshot and share results via Turbot Pipes:

powerpipe login
powerpipe control run azure_compliance.control.cis_v130_8_1 --share

SQL

This control uses a named query:

select
  kvk.id as resource,
  case
    when enabled and expires_at is null then 'alarm'
    else 'ok'
  end as status,
  vault_name || ' key ' || name ||
  case
    when enabled and expires_at is null then ' expiration date not set.'
    when not enabled then ' disabled.'
    else ' expiration date set to ' || to_char(expires_at, 'DD-Mon-YYYY') || '.'
  end as reason
  
  , kvk.resource_group as resource_group
  , sub.display_name as subscription
from
  azure_key_vault_key kvk
  left join azure_subscription as sub on sub.subscription_id = kvk.subscription_id;