Control: 5.1.5 Ensure that logging for Azure KeyVault is 'Enabled'

Description

Enable AuditEvent logging for key vault instances to ensure interactions with key vaults are logged and available.

Monitoring how and when key vaults are accessed, and by whom enables an audit trail of interactions with confidential information, keys and certificates managed by Azure Keyvault. Enabling logging for Key Vault saves information in an Azure storage account that the user provides. This creates a new container named insights-logs-auditevent automatically for the specified storage account, and this same storage account can be used for collecting logs for multiple key vaults.

Remediation

From Azure Portal

Go to Keyvaults
For each Key vault
Go to Diagnostic settings
Click on Edit Settings
Enable Archive to a storage account
Check AuditEvent
Change the retention days to be 180, 0 (for indefinite) or as appropriate

From Azure CLI

az monitor diagnostic-settings update --name "Key vault retention policy" --resource "" --set retentionPolicy.days=90

Default Value

By default, Diagnostic AuditEvent logging is not enabled for Key Vault instances.

Usage

Run the control in your terminal:

powerpipe control run azure_compliance.control.cis_v150_5_1_5

Snapshot and share results via Turbot Pipes:

powerpipe login
powerpipe control run azure_compliance.control.cis_v150_5_1_5 --share

SQL

This control uses a named query:

with logging_details as (
  select
    name as key_vault_name
  from
    azure_key_vault,
    jsonb_array_elements(diagnostic_settings) setting,
    jsonb_array_elements(setting -> 'properties' -> 'logs') log
  where
    diagnostic_settings is not null
    and setting -> 'properties' ->> 'storageAccountId' <> ''
    and (log ->> 'enabled') :: boolean
    and log ->> 'category' = 'AuditEvent'
    and (log -> 'retentionPolicy') :: JSONB ? 'days'
)
select
  v.id as resource,
  case
    when v.diagnostic_settings is null then 'alarm'
    when l.key_vault_name not like concat('%', v.name, '%') then 'alarm'
    else 'ok'
  end as status,
  case
    when v.diagnostic_settings is null then v.name || ' logging not enabled.'
    when l.key_vault_name not like concat('%', v.name, '%') then v.name || ' logging not enabled.'
    else v.name || ' logging enabled.'
  end as reason
  
  , v.resource_group as resource_group
  , sub.display_name as subscription
from
  azure_key_vault v,
  logging_details l,
  azure_subscription sub
where
  sub.subscription_id = v.subscription_id;