Control: 5.3.4 Ensure server parameter 'audit_log_events' has 'CONNECTION' set for MySQL flexible Server

Description

Set audit_log_events to include CONNECTION on MySQL flexible servers.

Enabling CONNECTION helps MySQL Database to log items such as successful and failed connection attempts to the server. Log data can be used to identify, troubleshoot, and repair configuration errors and suboptimal performance.

Remediation

From Azure Portal

Login to Azure Portal using https://portal.azure.com.
Go to Azure Database for MySQL flexible servers.
For each database, under Settings, click Server parameters.
In the filter bar, type audit_log.
Set audit_log_enabled to ON.
In the drop-down next to audit_log_events, check CONNECTION.
Click Save.
Under Monitoring, select Diagnostic settings.
Select + Add diagnostic setting.
Provide a diagnostic setting name.
Under Categories, select MySQL Audit Logs.
Specify destination details.
Click Save.

It may take up to 10 minutes for the logs to appear in the configured destination.

From Azure CLI

Use the below command to set audit_log_events to CONNECTION:

az mysql flexible-server parameter set --resource-group <resourceGroup> --server-name <serverName> --name audit_log_events --value CONNECTION

From PowerShell

Use the below command to set audit_log_events to CONNECTION:

Update-AzMySqlFlexibleServerConfiguration -ResourceGroupName <resourceGroup> -ServerName <serverName> -Name audit_log_events -Value CONNECTION

Default Value

By default audit_log_events is set to CONNECTION.

Usage

Run the control in your terminal:

powerpipe control run azure_compliance.control.cis_v300_5_3_4

Snapshot and share results via Turbot Pipes:

powerpipe login
powerpipe control run azure_compliance.control.cis_v300_5_3_4 --share

SQL

This control uses a named query:

with audit_log_events as(
  select
    id
  from
    azure_mysql_flexible_server,
    jsonb_array_elements(flexible_server_configurations) as config
  where
    config ->> 'Name' = 'audit_log_events'
    and config -> 'ConfigurationProperties' ->> 'value' = 'CONNECTION'
)
select
  s.id as resource,
  case
    when a.id is not null then 'ok'
    else 'alarm'
  end as status,
  case
    when a.id is not null then s.title || ' server parameter audit_log_events has connection set.'
    else s.title || ' server parameter audit_log_events connection not set.'
  end as reason
  
  , s.resource_group as resource_group
  , sub.display_name as subscription
from
  azure_mysql_flexible_server as s
  left join audit_log_events as a on s.id = a.id
  left join azure_subscription as sub on sub.subscription_id = s.subscription_id;