Control: 4.4 Ensure oslogin is enabled for a Project

Description

Enabling OS login binds SSH certificates to IAM users and facilitates effective SSH certificate management.

Enabling osLogin ensures that SSH keys used to connect to instances are mapped with IAM users. Revoking access to IAM user will revoke all the SSH keys associated with that particular user. It facilitates centralized and automated SSH key pair management which is useful in handling cases like response to compromised SSH key pairs and/or revocation of external/third-party/Vendor users.

Note: By default, parameter enable-osloginis not set, which is equivalent to setting it to FALSE.

Remediation

From Console

1. Login to GCP VM Console.
2. Select the instance and click Edit.
3. Navigate to Metadata section in the left panel.
4. Add a metadata entry where the key is enable-oslogin and the value is TRUE.
5. Click Save to apply the changes.
6. Ensure that no instance in the project overrides the project setting.
7. See more detail here

From Command Line

1. Configure oslogin on the project

gcloud compute project-info add-metadata --metadata enable-oslogin=TRUE

2. Remove instance metadata that overrides the project setting.

gcloud compute instances remove-metadata INSTANCE_NAME --keys=enable-oslogin