lacework-global-284
6.2.9 Ensure That 'cloudsql.enable_pgaudit' Database Flag for each Cloud Sql Postgresql Instance Is Set to 'on' For Centralized Logging (Automated)
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Description
Ensure cloudsql.enable_pgaudit
database flag for Cloud SQL PostgreSQL instance is set to on
to allow for centralized logging.
Rationale
As numerous other recommendations in this section consist of turning on flags for logging purposes, your organization will need a way to manage these logs. You may have a solution already in place. If you do not, consider installing and enabling the open source pgaudit extension within PostgreSQL and enabling its corresponding flag of cloudsql.enable_pgaudit
. This flag and installing the extension enables database auditing in PostgreSQL through the open-source pgAudit extension. This extension provides detailed session and object logging to comply with government, financial, & ISO standards and provides auditing capabilities to mitigate threats by monitoring security events on the instance. Enabling the flag and settings later in this recommendation will send these logs to Google Logs Explorer so that you can access them in a central location. to This recommendation is applicable only to PostgreSQL database instances.
Impact
Enabling the pgAudit extension can lead to increased data storage requirements and to ensure durability of pgAudit log records in the event of unexpected storage issues, it is recommended to enable the Enable automatic storage increases
setting on the instance. Enabling flags via the command line will also overwrite all existing flags, so you should apply all needed flags in the CLI command. Also flags may require a restart of the server to be implemented or will break existing functionality so update your servers at a time of low usage.
Audit
Determining if the pgAudit Flag is set to 'on'
From Console:
- Go to https://console.cloud.google.com/sql/instances.
- Select the instance to open its
Overview
page. - Click
Edit
. - Scroll down and expand
Flags
. - Ensure that
cloudsql.enable_pgaudit
flag is set toon
.
From Command Line:
Run the command by providing <INSTANCE_NAME>
. Ensure the value of the flag is on
.
gcloud sql instances describe <INSTANCE_NAME> --format="json" | jq '.settings|.|.databaseFlags[]|select(.name=="cloudsql.enable_pgaudit")|.value'
Determine if the pgAudit extension is installed
- Connect to the the server running PostgreSQL or through a SQL client of your choice.
- Via command line open the PostgreSQL shell by typing
psql
- Run the following command
SELECT *
FROM pg_extension;
- If pgAudit is in this list. If so, it is installed.
Determine if Data Access Audit logs are enabled for your project and have sufficient privileges
- From the homepage open the hamburger menu in the top left.
- Scroll down to
IAM & Admin
and hover over it. - In the menu that opens up, select
Audit Logs
- In the middle of the page, in the search box next to
filter
search forCloud Composer API
- Select it, and ensure that both 'Admin Read' and 'Data Read' are checked.
Determine if logs are being sent to Logs Explorer
- From the Google Console home page, open the hamburger menu in the top left.
- In the menu that pops open, scroll down to Logs Explorer under Operations.
- In the query box, paste the following and search
resource.type="cloudsql_database"
logName="projects/<your-project-name>/logs/cloudaudit.googleapis.com%2Fdata_access"
protoPayload.request.@type="type.googleapis.com/google.cloud.sql.audit.v1.PgAuditEntry"
- If it returns any log sources, they are correctly setup.
Remediation
Initialize the pgAudit flag
From Console:
- Go to https://console.cloud.google.com/sql/instances.
- Select the instance to open its
Overview
page. - Click
Edit
. - Scroll down and expand
Flags
. - To set a flag that has not been set on the instance before, click
Add item
. - Enter
cloudsql.enable_pgaudit
for the flag name and set the flag toon
. - Click
Done
. - Click
Save
to update the configuration. - Confirm your changes under
Flags
on theOverview
page.
From Command Line:
Run the below command by providing <INSTANCE_NAME>
to enable cloudsql.enable_pgaudit
flag.
gcloud sql instances patch <INSTANCE_NAME> --database-flags=cloudsql.enable_pgaudit=on
note
RESTART
is required to get this configuration in effect.
Creating the extension
- Connect to the the server running PostgreSQL or through a SQL client of your choice.
- If SSHing to the server in the command line open the PostgreSQL shell by typing
psql
- Run the following command as a superuser.
CREATE EXTENSION pgaudit;
Updating the previously created pgaudit.log flag for your Logging Needs
From Console:
note
There are multiple options here. This command will enable logging for all databases on a server. Please see the customizing database audit logging reference for more flag options.
- Go to https://console.cloud.google.com/sql/instances.
- Select the instance to open its
Overview
page. - Click
Edit
. - Scroll down and expand
Flags
. - To set a flag that has not been set on the instance before, click
Add item
. - Enter
pgaudit.log=all
for the flag name and set the flag toon
. - Click
Done
. - Click
Save
to update the configuration. - Confirm your changes under
Flags
on theOverview
page.
From Command Line:
Run the command
gcloud sql instances patch <INSTANCE_NAME> --database-flags \
cloudsql.enable_pgaudit=on,pgaudit.log=all
Determine if logs are being sent to Logs Explorer
- From the Google Console home page, open the hamburger menu in the top left.
- In the menu that pops open, scroll down to Logs Explorer under Operations.
- In the query box, paste the following and search
resource.type="cloudsql_database"
logName="projects/<your-project-name>/logs/cloudaudit.googleapis.com%2Fdata_access"
protoPayload.request.@type="type.googleapis.com/google.cloud.sql.audit.v1.PgAuditEntry"
If it returns any log sources, they are correctly setup.
References
https://cloud.google.com/sql/docs/postgres/flags#list-flags-postgres
https://cloud.google.com/sql/docs/postgres/pg-audit#enable-auditing-flag
https://cloud.google.com/sql/docs/postgres/pg-audit#customizing-database-audit-logging
https://cloud.google.com/logging/docs/audit/configure-data-access#config-console-enable
Additional Information
warning
This patch modifies database flag values, which may require your instance to be restarted. Check the list of supported flags - https://cloud.google.com/sql/docs/postgres/flags - to see if your instance will be restarted when this patch is submitted.
note
Configuring the 'cloudsql.enable_pgaudit' database flag requires restarting the Cloud SQL PostgreSQL instance.