PostgreSQL must provide a warning to appropriate support staff when allocated audit record storage volume reaches 75 percent of maximum audit record storage capacity.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-261919	SRG-APP-000359-DB-000319	CD16-00-007300	SV-261919r1000762_rule	2024-06-17	1

Description
Organizations are required to use a central log management system so under normal conditions, the audit space allocated to PostgreSQL on its own server will not be an issue. However, space will still be required on the PostgreSQL server for audit records in transit, and, under abnormal conditions, this could fill up. Since a requirement exists to halt processing upon audit failure, a service outage would result. If support personnel are not notified immediately upon storage volume utilization reaching 75%, they are unable to plan for storage capacity expansion. The appropriate support staff include, at a minimum, the information system security officer (ISSO) and the database administrator (DBA)/system administrator (SA).

Description

Organizations are required to use a central log management system so under normal conditions, the audit space allocated to PostgreSQL on its own server will not be an issue. However, space will still be required on the PostgreSQL server for audit records in transit, and, under abnormal conditions, this could fill up. Since a requirement exists to halt processing upon audit failure, a service outage would result. If support personnel are not notified immediately upon storage volume utilization reaching 75%, they are unable to plan for storage capacity expansion. The appropriate support staff include, at a minimum, the information system security officer (ISSO) and the database administrator (DBA)/system administrator (SA).

ℹ️ Check
Review system configuration. If no script or tool is monitoring the partition for the PostgreSQL log directories, this is a finding. If appropriate support staff are not notified immediately upon storage volume utilization reaching 75 percent, this is a finding.

✔️ Fix
Note: The following instructions use the PGDATA and PGVER environment variables. Refer to APPENDIX-F for instructions on configuring PGDATA and APPENDIX-H for PGVER. Configure the system to notify appropriate support staff immediately upon storage volume utilization reaching 75 percent. PostgreSQL does not monitor storage; however, it is possible to monitor storage with a script. ##### Example Monitoring Script #!/bin/bash PGDATA=/var/lib/pgsql/${PGVER?}/data CURRENT=$(df ${PGDATA?} \| grep / \| awk '{ print $5}' \| sed 's/%//g') THRESHOLD=75 if [ "$CURRENT" -gt "$THRESHOLD" ] ; then mail -s 'Disk Space Alert' mail@support.com << EOF The data directory volume is almost full. Used: $CURRENT EOF fi Schedule this script in cron to run around the clock.

✔️ Fix

Note: The following instructions use the PGDATA and PGVER environment variables. Refer to APPENDIX-F for instructions on configuring PGDATA and APPENDIX-H for PGVER. Configure the system to notify appropriate support staff immediately upon storage volume utilization reaching 75 percent. PostgreSQL does not monitor storage; however, it is possible to monitor storage with a script. ##### Example Monitoring Script #!/bin/bash PGDATA=/var/lib/pgsql/${PGVER?}/data CURRENT=$(df ${PGDATA?} | grep / | awk '{ print $5}' | sed 's/%//g') THRESHOLD=75 if [ "$CURRENT" -gt "$THRESHOLD" ] ; then mail -s 'Disk Space Alert' mail@support.com << EOF The data directory volume is almost full. Used: $CURRENT EOF fi Schedule this script in cron to run around the clock.