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PostgreSQL must generate audit records when privileges/permissions are deleted.


Finding ID Version Rule ID IA Controls Severity
V-214102 PGS9-00-006100 SV-214102r508027_rule Medium
Changes in the permissions, privileges, and roles granted to users and roles must be tracked. Without an audit trail, unauthorized elevation or restriction of privileges could go undetected. Elevated privileges give users access to information and functionality that they should not have; restricted privileges wrongly deny access to authorized users. In an SQL environment, deleting permissions is typically done via the REVOKE command.
PostgreSQL 9.x Security Technical Implementation Guide 2022-06-13


Check Text ( C-15318r360937_chk )
First, as the database administrator, verify pgaudit is enabled by running the following SQL:

$ sudo su - postgres
$ psql -c "SHOW shared_preload_libraries"

If the output does not contain pgaudit, this is a finding.

Next, verify that role, read, write, and ddl auditing are enabled:

$ psql -c "SHOW pgaudit.log"

If the output does not contain role, read, write, and ddl, this is a finding.
Fix Text (F-15316r360938_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.

Using pgaudit PostgreSQL can be configured to audit these requests. See supplementary content APPENDIX-B for documentation on installing pgaudit. 

With pgaudit installed the following configurations can be made: 

$ sudo su - postgres 
$ vi ${PGDATA?}/postgresql.conf 

Add the following parameters (or edit existing parameters): 

pgaudit.log = 'role' 

Now, as the system administrator, reload the server with the new configuration: 

$ sudo systemctl reload postgresql-${PGVER?}

$ sudo service postgresql-${PGVER?} reload