📝 Google Logging Log Sink exports logs to a Storage Bucket without Bucket Lock 🟢

• Contextual name: 📝 og Sink exports logs to a Storage Bucket without Bucket Lock 🟢
• ID: /ce/ca/google/logging/storage-bucket-retention-policy
• Located in: 📁 Google Logging

Flags

• 🟢 Policy with categories
• 🟢 Policy with type
• 🟢 Production policy

Our Metadata

• Policy Type: COMPLIANCE_POLICY
• Policy Category:
  • SECURITY

Similar Policies

• Cloud Conformity
  • Configure Retention Policies with Bucket Lock

Logic

• 🧠 prod.logic.yaml 🟢
  • 📕 Google Logging Log Sink
  • 🔌 Google Storage Bucket - object.extracts.yaml
  • 🔌 Google Logging Log Sink - object.extracts.yaml
  • 🧪 test-data.json

Description

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Description

Enabling retention policies on log buckets will protect logs stored in cloud storage buckets from being overwritten or accidentally deleted. It is recommended to set up retention policies and configure Bucket Lock on all storage buckets that are used as log sinks.

Rationale

Logs can be exported by creating one or more sinks that include a log filter and a destination. As Cloud Logging receives new log entries, they are compared against each sink. If a log entry matches a sink's filter, then a copy of the log entry is written to the destination.

Sinks can be configured to export logs in storage buckets. It is recommended to configure a data retention policy for these cloud storage buckets and to lock the data retention policy; thus permanently preventing the policy from being reduced or removed. This way, if the system is ever compromised by an attacker or a malicious insider who wants to cover their tracks, the activity logs are definitely preserved for forensics and security investigations.

Impact

... see more

Remediation

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Remediation

From Google Cloud Console

1. If sinks are not configured, first follow the instructions in the recommendation: Ensure that sinks are configured for all Log entries.
2. For each storage bucket configured as a sink, go to the Cloud Storage browser at https://console.cloud.google.com/storage/browser/<BUCKET_NAME>.
3. Select the Bucket Lock tab near the top of the page.
4. In the Retention policy entry, click the Add Duration link. The Set a retention policy dialog box appears.
5. Enter the desired length of time for the retention period and click Save policy.
6. Set the Lock status for this retention policy to Locked.

From Google Cloud CLI

1. To list all sinks destined to storage buckets:

    gcloud logging sinks list --folder=FOLDER_ID | --organization=ORGANIZATION_ID | --project=PROJECT_ID

2. For each storage bucket listed above, set a retention policy and lock it:

    gsutil retention set [TIME_DURATION] gs://[BUCKET_NAME] gsutil retention lock gs://[BUCKET_NAME]

For more information, visit https://cloud.google.com/storage/docs/using-bucket-lock#set-policy.

policy.yaml

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Linked Framework Sections

Section	Sub Sections	Internal Rules	Policies	Flags
💼 CIS GCP v3.0.0 → 💼 2.3 Ensure That Retention Policies on Cloud Storage Buckets Used for Exporting Logs Are Configured Using Bucket Lock - Level 2 (Automated)			1
💼 Cloudaware Framework → 💼 Logging and Monitoring Configuration			49