Control: 9.4 Ensure the web app has 'Client Certificates (Incoming client certificates)' set to 'On'
Description
Client certificates allow for the app to request a certificate for incoming requests. Only clients that have a valid certificate will be able to reach the app.
The TLS mutual authentication technique in enterprise environments ensures the authenticity of clients to the server. If incoming client certificates are enabled, then only an authenticated client who has valid certificates can access the app.
Remediation
From Azure Portal
- Login to Azure Portal using https://portal.azure.com.
- Go to
App Services. - Click on each App.
- Under the Settings section, Click on
Configuration, thenGeneral settings. - Set the option
Client certificate modelocated under Incoming client certificates is set toRequire.
From Azure CLI
To set Incoming client certificates value for an existing app, run the following command:
az webapp update --resource-group <RESOURCE_GROUP_NAME> --name <APP_NAME> -- set clientCertEnabled=true
Default Value
By default, incoming client certificates will be disabled when a new app is created using the command-line tool or Azure Portal console.
Usage
Run the control in your terminal:
powerpipe control run azure_compliance.control.cis_v200_9_4Snapshot and share results via Turbot Pipes:
powerpipe loginpowerpipe control run azure_compliance.control.cis_v200_9_4 --shareSQL
This control uses a named query:
appservice_web_app_incoming_client_cert_on