lacework-global-248
2.5 Ensure That the Log Metric Filter and Alerts Exist for Audit Configuration Changes (Automated)
Profile Applicability
• Level 1
Description
Google Cloud Platform (GCP) services write audit log entries to the Admin Activity and Data Access logs to help answer the questions of, "who did what, where, and when?" within GCP projects.
Cloud audit logging records information includes the identity of the API caller, the time of the API call, the source IP address of the API caller, the request parameters, and the response elements returned by GCP services. Cloud audit logging provides a history of GCP API calls for an account, including API calls made via the console, SDKs, command-line tools, and other GCP services.
Rationale
Admin activity and data access logs produced by cloud audit logging enable security analysis, resource change tracking, and compliance auditing.
Configuring the metric filter and alerts for audit configuration changes ensures the recommended state of audit configuration is maintained so that all activities in the project are audit-able at any point in time.
Impact
Enabling of logging may result in your project being charged for the additional logs usage.
Audit
From Console:
Ensure the prescribed log metric is present:
Go to
Logging/Logs-based Metrics
by visiting https://console.cloud.google.com/logs/metrics.In the
User-defined Metrics
section, ensure that at least one metric<Log_Metric_Name>
is present with the filter text:
protoPayload.methodName="SetIamPolicy" AND
protoPayload.serviceData.policyDelta.auditConfigDeltas:*
Ensure that the prescribed alerting policy is present:
Go to
Alerting
by visiting https://console.cloud.google.com/monitoring/alerting.Under the
Policies
section, ensure that at least one alert policy exists for the log metric above. Clicking on the policy should show that it is configured with a condition. For example,Violates when: Any logging.googleapis.com/user/<Log Metric Name> stream
is above a threshold of 0 for greater than zero(0) seconds
, means that the alert will trigger for any new owner change. Verify that the chosen alerting thresholds make sense for the user's organization.Ensure that appropriate notifications channels have been set up.
From Command Line:
Ensure that the prescribed log metric is present:
- List the log metrics:
gcloud beta logging metrics list --format json
- Ensure that the output contains at least one metric with the filter set to:
protoPayload.methodName="SetIamPolicy" AND
protoPayload.serviceData.policyDelta.auditConfigDeltas:*
- Note the value of the property
metricDescriptor.type
for the identified metric, in the formatlogging.googleapis.com/user/<Log Metric Name>
.
Ensure that the prescribed alerting policy is present:
- List the alerting policies:
gcloud alpha monitoring policies list --format json
- Ensure that the output contains at least one alert policy where:
conditions.conditionThreshold.filter
is set tometric.type=\"logging.googleapis.com/user/<Log Metric Name>\"
- AND
enabled
is set totrue
Remediation
From Console:
Create the prescribed log metric:
Go to
Logging/Logs-based Metrics
by visiting https://console.cloud.google.com/logs/metrics and click "CREATE METRIC".Click the down arrow symbol on the
Filter Bar
at the rightmost corner and selectConvert to Advanced Filter
.Clear any text and add:
protoPayload.methodName="SetIamPolicy" AND
protoPayload.serviceData.policyDelta.auditConfigDeltas:*
Click
Submit Filter
. Display logs appear based on the filter text entered by the user.In the
Metric Editor
menu on the right, fill out the name field. SetUnits
to1
(default) andType
toCounter
. This will ensure that the log metric counts the number of log entries matching the user's advanced logs query.Click
Create Metric
.
Create a prescribed Alert Policy:
Identify the new metric the user just created, under the section
User-defined Metrics
at https://console.cloud.google.com/logs/metrics.Click the 3-dot icon in the rightmost column for the new metric and select
Create alert from Metric
. A new page opens.Fill out the alert policy configuration and click
Save
. Choose the alerting threshold and configuration that makes sense for the organization. For example, a threshold of zero(0) for the most recent value will ensure that a notification is triggered for every owner change in the project:
Set `Aggregator` to `Count`
Set `Configuration`:
- Condition: above
- Threshold: 0
- For: most recent value
Configure the desired notifications channels in the section
Notifications
.Name the policy and click
Save
.
From Command Line:
Create a prescribed Log Metric:
- Use the command: gcloud beta logging metrics create
- Reference for command usage: https://cloud.google.com/sdk/gcloud/reference/beta/logging/metrics/create Create prescribed Alert Policy
- Use the command: gcloud alpha monitoring policies create
- Reference for command usage: https://cloud.google.com/sdk/gcloud/reference/alpha/monitoring/policies/create
References
https://cloud.google.com/logging/docs/logs-based-metrics/
https://cloud.google.com/monitoring/custom-metrics/
https://cloud.google.com/monitoring/alerts/
https://cloud.google.com/logging/docs/reference/tools/gcloud-logging
https://cloud.google.com/logging/docs/audit/configure-data-access#getiampolicy-setiampolicy