PostgreSQL must generate audit records when successful logons or connections occur.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-233558 | CD12-00-005100 | SV-233558r961824_rule | CCI-000172 | medium |
| Description | ||||
| For completeness of forensic analysis, it is necessary to track who/what (a user or other principal) logs on to PostgreSQL. | ||||
| STIG | Date | |||
| Crunchy Data PostgreSQL Security Technical Implementation Guide | 2024-08-27 | |||
Details
Check Text (C-233558r961824_chk)
Note: The following instructions use the PGDATA and PGLOG environment variables. See supplementary content APPENDIX-F for instructions on configuring PGDATA and APPENDIX-I for PGLOG.
First, as the database administrator (shown here as "postgres"), check if log_connections is enabled by running the following SQL:
$ sudo su - postgres
$ psql -c "SHOW log_connections"
If log_connections is off, this is a finding.
Next, verify the logs that the previous connection to the database was logged:
$ sudo su - postgres
$ cat ${PGDATA?}/${PGLOG?}/<latest_log>
< 2016-02-16 15:54:03.934 EST postgres postgres 56c64b8b.aeb: >LOG: connection authorized: user=postgres database=postgres
If an audit record is not generated each time a user (or other principal) logs on or connects to PostgreSQL, this is a finding.
Fix Text (F-36717r606898_fix)
Note: The following instructions use the PGDATA and PGVER environment variables. See supplementary content APPENDIX-F for instructions on configuring PGDATA and APPENDIX-H for PGVER.
To ensure that logging is enabled, review supplementary content APPENDIX-C for instructions on enabling logging.
If logging is enabled the following configurations must be made to log connections, date/time, username, and session identifier.
First, as the database administrator (shown here as "postgres"), edit postgresql.conf:
$ sudo su - postgres
$ vi ${PGDATA?}/postgresql.conf
Edit the following parameters as such:
log_connections = on
log_line_prefix = '< %m %u %d %c: >'
Where:
* %m is the time and date
* %u is the username
* %d is the database
* %c is the session ID for the connection
Now, as the system administrator, reload the server with the new configuration:
$ sudo systemctl reload postgresql-${PGVER?}