V-72973

  control "V-72973" do
  title "PostgreSQL must generate audit records when categorized information
  (e.g., classification levels/security levels) is modified."
  desc  "Changes in categorized information must be tracked. Without an audit
  trail, unauthorized access to protected data could go undetected.
  For detailed information on categorizing information, refer to FIPS
  Publication 199, Standards for Security Categorization of Federal Information
  and Information Systems, and FIPS Publication 200, Minimum Security
  Requirements for Federal Information and Information Systems."
  impact 0.5
  tag "severity": "medium"
  tag "gtitle": "SRG-APP-000498-DB-000346"
  tag "gid": "V-72973"
  tag "rid": "SV-87625r1_rule"
  tag "stig_id": "PGS9-00-006700"
  tag "cci": "CCI-000172"
  tag "nist": ["AU-12 c", "Rev_4"]
  tag "check": "If category tracking is not required in the database, this is
  not applicable.
  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."
  tag "fix": "Note: The following instructions use the PGDATA environment
  variable. See supplementary content APPENDIX-F for instructions on configuring P
  GDATA.
  To ensure that logging is enabled, review supplementary content APPENDIX-C for
  instructions on enabling logging.
  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='ddl, role, read, write'
  Now, as the system administrator, reload the server with the new configuration:
  # SYSTEMD SERVER ONLY
  $ sudo systemctl reload postgresql-9.5
  # INITD SERVER ONLY
  $ sudo service postgresql-9.5 reload"

  sql = postgres_session(PG_DBA, PG_DBA_PASSWORD, PG_HOST)

  describe sql.query('SHOW shared_preload_libraries;', [PG_DB]) do
    its('output') { should include 'pgaudit' }
  end

  pgaudit_types = %w(ddl read role write)

  pgaudit_types.each do |type|
    describe sql.query('SHOW pgaudit.log;', [PG_DB]) do
      its('output') { should include type }
    end
  end
end