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Configure CMEK for Cloud Logging

This document describes how to configure and manage customer-managed encryption keys (CMEK) for Cloud Logging to meet your organization's compliance needs. You can configure CMEK as a default resource setting for an organization, a folder, or for both. When configured, Cloud Logging ensures that all new log buckets in the organization or folder are encrypted with a customer-managed key.

You can configure a default settings for an organization and for folders. When you create new resources, those resources inherit the default settings of their parent. For example, if you configure CMEK as a default resource setting for an organization, then any new _Default and _Required log buckets that are created in projects, folders, or billing accounts in that organization are encrypted with the default key. Further, if you create a custom log bucket in a project that is a child of that organization, then the default key is automatically used unless you provide a different key when creating the log bucket.

The instructions in this guide use the Google Cloud CLI.

By default, Cloud Logging encrypts customer content at rest. Logging handles encryption for you without any additional actions on your part. This option is called Google default encryption.

If you want to control your encryption keys, then you can use customer-managed encryption keys (CMEKs) in Cloud KMS with CMEK-integrated services including Logging. Using Cloud KMS keys gives you control over their protection level, location, rotation schedule, usage and access permissions, and cryptographic boundaries. Using Cloud KMS also lets you view audit logs and control key lifecycles. Instead of Google owning and managing the symmetric key encryption keys (KEKs) that protect your data, you control and manage these keys in Cloud KMS.

After you set up your resources with CMEKs, the experience of accessing your Logging resources is similar to using Google default encryption. For more information about your encryption options, see Customer-managed encryption keys (CMEK).

When you configure CMEK as a default resource setting for Logging, the following occur:

• New log buckets in the organization or folder are automatically encrypted with the configured key. However, you can change that key or create log buckets and specify a different key. For more information, see Configure CMEK for log buckets.

• If you use Log Analytics and query multiple log buckets, then the default key might be used to encrypt temporary data. For more information, see Log Analytics restrictions.

To get started, complete the following steps:

1. Before you create a log bucket with CMEK enabled, review the Limitations.

2. In the Google Cloud console, activate Cloud Shell.

   Activate Cloud Shell

   At the bottom of the Google Cloud console, a Cloud Shell session starts and displays a command-line prompt. Cloud Shell is a shell environment with the Google Cloud CLI already installed and with values already set for your current project. It can take a few seconds for the session to initialize.

3. Configure the Google Cloud project where you plan to create your keys:

   1. To get the permissions that you need to create keys, ask your administrator to grant you the Cloud KMS Admin (roles/cloudkms.admin) IAM role on your project. For more information about granting roles, see Manage access to projects, folders, and organizations.

      You might also be able to get the required permissions through custom roles or other predefined roles.

   2. Enable the Cloud KMS API.

   3. Create a key ring and keys.

      Cloud Logging lets you use a key from any region. However, when you create a log bucket, the location of the log bucket must match the location of the key. For information about supported regions, see the following:

      • Cloud KMS locations
      • Logging Supported regions

      If you configure CMEK as a default resource setting for Logging by using the steps in this document, then new log buckets created in the organization or folder are automatically configured for CMEK. Also, because the location of a log bucket must match the location of the key, after you configure CMEK as a default resource setting, you can't create log buckets in the global region.

4. Ensure that your IAM role on the organization or folder whose default settings you want to configure includes the following Cloud Logging permissions:

   • logging.settings.get
   • logging.settings.update

Follow these instructions to enable CMEK for your Google Cloud folder or organization.

To determine the service-account ID associated with the organization or folder for which CMEK will apply, run the following gcloud logging settings describe command:

 gcloud logging settings describe --folder=FOLDER_ID

Before running the previous command, make the following replacement:

• FOLDER_ID: The unique numeric identifier of the folder. For information about using folders, see Creating and managing folders.

gcloud logging settings describe --organization=ORGANIZATION_ID

Before running the previous command, make the following replacement:

• ORGANIZATION_ID: The unique numeric identifier of the organization. For information about getting this identifier, see Getting your organization ID.

The previous command generates service accounts for the organization or folder, when they don't exist. The command also returns the IDs of two service accounts, one in the kmsServiceAccountId field and the other in the loggingServiceAccountId field. To configure the CMEK as a default setting, use the value in the kmsServiceAccountId field.

The following illustrates a sample response to the previous command when an organization is specified:

kmsServiceAccountId: KMS_SERVICE_ACCT_NAME@gcp-sa-logging.iam.gserviceaccount.com
loggingServiceAccountId: SERVICE_ACCT_NAME@gcp-sa-logging.iam.gserviceaccount.com
name: organizations/ORGANIZATION_ID/settings

Run the provisioning process one time per resource. Running the describe command multiple times returns the same value for the kmsServiceAccountId field.

If you can't use the Google Cloud CLI, then run the Cloud Logging API method getSettings.

To use CMEK, give the service account permission to use your Cloud KMS by assigning the Cloud KMS CryptoKey Encrypter/Decrypter role to the service account:

gcloud kms keys add-iam-policy-binding \
--project=KMS_PROJECT_ID \
--member serviceAccount:KMS_SERVICE_ACCT_NAME@gcp-sa-logging.iam.gserviceaccount.com \
--role roles/cloudkms.cryptoKeyEncrypterDecrypter \
--location=KMS_KEY_LOCATION \
--keyring=KMS_KEY_RING \
KMS_KEY_NAME

Before running the previous command, make the following replacements:

• KMS_PROJECT_ID: The unique alphanumeric identifier, composed of your Google Cloud project name and a randomly assigned number, of the Google Cloud project running Cloud KMS. For information about getting this identifier, see Identifying projects.
• KMS_SERVICE_ACCT_NAME: The name of the service account shown in the kmsServiceAccountId field of the response of the gcloud logging settings describe command.
• KMS_KEY_LOCATION: The Cloud KMS key's region.
• KMS_KEY_RING: The Cloud KMS key ring's name.
• KMS_KEY_NAME: The Cloud KMS key's name. It is formatted like this: projects/KMS_PROJECT_ID/locations/LOCATION/keyRings/KMS_KEY_RING/cryptoKeys/KEY.

1. In the Google Cloud console, go to the Key management page.

   Go to Key management

2. Select the name of the key ring that contains the key.

3. Select the checkbox for the key.

   The Permissions tab becomes available.

4. In the Add members dialog, specify the email address of the Logging service account you are granting access.

5. In the Select a role drop down, select Cloud KMS CryptoKey Encrypter/Decrypter.

6. Click Add.

Logging supports organization policies that can require CMEK protection and can limit which Cloud KMS CryptoKeys can be used for CMEK protection:

• When logging.googleapis.com is in the Deny policy list of services for the constraint constraints/gcp.restrictNonCmekServices, Logging refuses to create new user-defined buckets that aren't CMEK-protected. However, this constraint doesn't prevent Cloud Logging from creating the _Required and _Default log buckets which are created when a Google Cloud project is created.

• When constraints/gcp.restrictCmekCryptoKeyProjects is enforced, Logging creates CMEK-protected resources that are protected by a CryptoKey from an allowed project, folder, or organization.

For more information about CMEK and organization policies, see CMEK organization policies.

When an organization policy that specifies a CMEK constraint exists, ensure that those constraints are consistent with Logging's default settings for an organization or a folder. Further, if you plan to modify your default settings, before you update the default settings, review and, if necessary, update the organization policies.

To view or configure organization policies, do the following:

1. In the Google Cloud console, go to the Organization Policies page:

   Go to Organization Policies

   If you use the search bar to find this page, then select the result whose subheading is IAM & Admin.

2. Select your organization.

3. Verify, and if necessary, update the constraints specific to CMEK.

   For information about how to modify an organization policy, see Creating and editing policies.

To configure CMEK as a default resource setting for Logging, run the following gcloud logging settings update command:

gcloud logging settings update \
    --folder=FOLDER_ID \
    --kms-location=KMS_KEY_LOCATION \
    --kms-key-name=KMS_KEY_NAME \
    --kms-keyring=KMS_KEY_RING \
    --kms-project=KMS_PROJECT_ID

Before running the previous command, make the following replacements:

• FOLDER_ID: The unique numeric identifier of the folder. For information about using folders, see Creating and managing folders.
• KMS_KEY_LOCATION: The Cloud KMS key's region.
• KMS_KEY_NAME: The Cloud KMS key's name. It is formatted like this: projects/KMS_PROJECT_ID/locations/LOCATION/keyRings/KMS_KEY_RING/cryptoKeys/KEY.
• KMS_KEY_RING: The Cloud KMS key ring's name.
• KMS_PROJECT_ID: The unique alphanumeric identifier, composed of your Google Cloud project name and a randomly assigned number, of the Google Cloud project running Cloud KMS. For information about getting this identifier, see Identifying projects.

The previous command updates the default settings to store information about the Cloud KMS key. You must ensure that the default storage location for the folder is set to the value of the KMS_KEY_LOCATION. If you haven't set the default storage location, or if the value of that location doesn't match the value of KMS_KEY_LOCATION, then append the following to the previous command:

--storage-location = KMS_KEY_LOCATION

The --storage-location flag lets you set or update the default storage location for the folder.

gcloud logging settings update \
    --organization=ORGANIZATION_ID \
    --kms-location=KMS_KEY_LOCATION \
    --kms-key-name=KMS_KEY_NAME \
    --kms-keyring=KMS_KEY_RING \
    --kms-project=KMS_PROJECT_ID

Before running the previous command, make the following replacements:

• ORGANIZATION_ID: The unique numeric identifier of the organization. For information about getting this identifier, see Getting your organization ID.
• KMS_KEY_LOCATION: The Cloud KMS key's region.
• KMS_KEY_NAME: The Cloud KMS key's name. It is formatted like this: projects/KMS_PROJECT_ID/locations/LOCATION/keyRings/KMS_KEY_RING/cryptoKeys/KEY.
• KMS_KEY_RING: The Cloud KMS key ring's name.
• KMS_PROJECT_ID: The unique alphanumeric identifier, composed of your Google Cloud project name and a randomly assigned number, of the Google Cloud project running Cloud KMS. For information about getting this identifier, see Identifying projects.

The previous command updates the default settings to store information about the Cloud KMS key. You must ensure that the default storage location for the organization is set to the value of the KMS_KEY_LOCATION. If you haven't set the default storage location, or if the value of that location doesn't match the value of KMS_KEY_LOCATION, then append the following to the previous command:

--storage-location = KMS_KEY_LOCATION

The --storage-location flag lets you set or update the default storage location for the organization.

After the key is applied, new log buckets in the organization or folder are configured to encrypt their data at rest using this key. You can also change keys for individual log buckets. You can't create log buckets in the global region because you must use a key whose region matches the regional scope of your data.

If you can't use the Google Cloud CLI, then run the Cloud Logging API method updateSettings.

To verify that you've successfully enabled CMEK for an organization or a folder, run the following gcloud logging settings describe command:

gcloud logging settings describe --folder=FOLDER_ID

Before running the previous command, make the following replacement:

• FOLDER_ID: The unique numeric identifier of the folder. For information about using folders, see Creating and managing folders.

gcloud logging settings describe --organization=ORGANIZATION_ID

Before running the previous command, make the following replacement:

• ORGANIZATION_ID: The unique numeric identifier of the organization. For information about getting this identifier, see Getting your organization ID.

When the previous command returns the Cloud KMS key name in the kmsKeyName field is populated, CMEK is enabled for the organization or folder:

kmsKeyName: KMS_KEY_NAME
kmsServiceAccountId: KMS_SERVICE_ACCT_NAME@gcp-sa-logging.iam.gserviceaccount.com
loggingServiceAccountId: SERVICE_ACCT_NAME@gcp-sa-logging.iam.gserviceaccount.com

• Cloud Logging log buckets can be configured to encrypt data with CMEK. When you configure CMEK as a default setting for an organization or folder, new log buckets in the organization or folder automatically use CMEK. You can change the key of these log buckets and you can create log buckets that use a different KMS key than the one specified by the default settings.

  For information about CMEK as applied to log buckets, including how to change keys and limitations when you enable CMEK on a log bucket, see Configure CMEK for log buckets.

• Cloud Storage supports CMEK for routing logs. For instructions about how to configure CMEK for Cloud Storage, see Using customer-managed encryption keys.

  If data is lost due to key unavailability when routing logs data to Cloud Storage, then you can retroactively copy logs in bulk to Cloud Storage when those logs are also stored in a log bucket. For details, see Copy log entries.

• BigQuery, by default, encrypts customer content stored at rest. For details, see Protecting data with Cloud Key Management Service keys.

• Pub/Sub, by default, encrypts customer content stored at rest. For details, see Configuring message encryption.

The following sections explain how to change, revoke access for, or disable your Cloud KMS key.

To change the Cloud KMS key associated with an organization or a folder, create a key, and then run the gcloud logging settings update command and supply information about the new Cloud KMS key:

gcloud logging settings update \
    --folder=FOLDER_ID
    --kms-key-name=NEW_KMS_KEY_NAME
    --kms-location=NEW_KMS_KEY_LOCATION \
    --kms-keyring=NEW_KMS_KEY_RING \
    --kms-project=NEW_KMS_PROJECT_ID

You must ensure that the default storage location for the folder is set to the value of the KMS_KEY_LOCATION. If you haven't set the default storage location, or if the value of that location doesn't match the value of KMS_KEY_LOCATION, then append the following to the previous command:

--storage-location = NEW_KMS_KEY_LOCATION

gcloud logging settings update \
    --organization=ORGANIZATION_ID
    --kms-key-name=NEW_KMS_KEY_NAME
    --kms-location=NEW_KMS_KEY_LOCATION \
    --kms-keyring=NEW_KMS_KEY_RING \
    --kms-project=NEW_KMS_PROJECT_ID

You must ensure that the default storage location for the organization is set to the value of the KMS_KEY_LOCATION. If you haven't set the default storage location, or if the value of that location doesn't match the value of KMS_KEY_LOCATION, then append the following to the previous command:

--storage-location = NEW_KMS_KEY_LOCATION

You can revoke Logging's access to the Cloud KMS key by removing the configured service account's IAM permission for that key.

If you remove Logging's access to a key, then it can take up to one hour for the change to take effect.

To revoke Logging's access to the Cloud KMS key, run the following Google Cloud CLI command:

gcloud kms keys remove-iam-policy-binding \
    --project=KMS_PROJECT_ID \
    --member serviceAccount:KMS_SERVICE_ACCT_NAME@gcp-sa-logging.iam.gserviceaccount.com \
    --role roles/cloudkms.cryptoKeyEncrypterDecrypter \
    --location=KMS_KEY_LOCATION \
    --keyring=KMS_KEY_RING \
    KMS_KEY_NAME

Before running the previous command, make the following replacements:

• KMS_PROJECT_ID: The unique alphanumeric identifier, composed of your Google Cloud project name and a randomly assigned number, of the Google Cloud project running Cloud KMS. For information about getting this identifier, see Identifying projects.
• KMS_SERVICE_ACCT_NAME: The name of the service account shown in the kmsServiceAccountId field of the response of the gcloud logging settings describe command.
• KMS_KEY_LOCATION: The Cloud KMS key's region.
• KMS_KEY_RING: The Cloud KMS key ring's name.
• KMS_KEY_NAME: The Cloud KMS key's name. It is formatted like this: projects/KMS_PROJECT_ID/locations/LOCATION/keyRings/KMS_KEY_RING/cryptoKeys/KEY.

Disabling CMEK for an organization or a folder removes CMEK policy enforcement for future operations only; any previously applied configurations remain intact.

To disable CMEK on a resource that has CMEK configured as a default resource setting, run the following Google Cloud CLI command:

gcloud logging settings update --folder=FOLDER_ID --clear-kms-key

Before running the previous command, make the following replacement:

• FOLDER_ID: The unique numeric identifier of the folder. For information about using folders, see Creating and managing folders.

gcloud logging settings update --organization=ORGANIZATION_ID --clear-kms-key

Before running the previous command, make the following replacement:

• ORGANIZATION_ID: The unique numeric identifier of the organization. For information about getting this identifier, see Getting your organization ID.

If you want to destroy your key, see Destroying and restoring key versions.

Cloud Logging doesn't automatically rotate the encryption key for temporary disaster recovery files when the Cloud KMS key associated with the Google Cloud organization or folder rotates. Existing recovery files continue to use the key version with which they were created. New recovery files use the current primary key version.

The following are known limitations when you configure CMEK as a default resource setting for Logging.

A Cloud KMS key is considered available and accessible by Logging when both of the following are true:

• The key is enabled.
• The service account listed in the kmsServiceAccountId field of the response of the gcloud logging settings describe command has encrypt and decrypt has permissions on the key.

If Logging loses access to the Cloud KMS key, then Logging is unable to write temporary disaster-recovery files and, for users, queries stop functioning. Query performance may remain degraded even after key access is restored.

Routing logs to Cloud Storage might also be affected because the Logging is unable to write temporary files required to facilitate the routing. If an error is encountered while encrypting or decrypting data, then a notification is sent to the Google Cloud project that contains the Cloud KMS key.

Logging client libraries don't provide methods for configuring CMEK.

When you use a Cloud EKM key, Google has no control over the availability of your externally managed key in the external key-management partner system.

When CMEK is configured as default resource setting for an organization or a folder, if an externally managed key is unavailable, then Cloud Logging continually retries accessing the key. Cloud Logging also buffers the incoming log data for up to one hour. After an hour, if Cloud Logging is still unable to access the externally managed key, then Cloud Logging begins dropping the data.

If CMEK is applied to a log bucket and if an externally managed key is unavailable, then Cloud Logging continues storing logs in log buckets, but users won't be able to access that data.

See the Cloud External Key Manager documentation for more considerations, and potential alternatives, when using external keys.

For limitations when you use CMEK with log buckets, see Limitations.

For details on Logging usage limits, see Quotas and limits.

For information about troubleshooting CMEK configuration errors, see Troubleshoot CMEK and default setting errors.

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