V-73031

control "V-73031" do
  title "PostgreSQL must only accept end entity certificates issued by DoD PKI or
DoD-approved PKI Certification Authorities (CAs) for the establishment of all
encrypted sessions."
  desc  "Only DoD-approved external PKIs have been evaluated to ensure that they
have security controls and identity vetting procedures in place which are sufficient
for DoD systems to rely on the identity asserted in the certificate. PKIs lacking
sufficient security controls and identity vetting procedures risk being compromised
and issuing certificates that enable adversaries to impersonate legitimate users.

The authoritative list of DoD-approved PKIs is published at
http://iase.disa.mil/pki-pke/interoperability.

This requirement focuses on communications protection for PostgreSQL session rather
than for the network packet."
  impact 0.5
  tag "severity": "medium"
  tag "gtitle": "SRG-APP-000427-DB-000385"
  tag "gid": "V-73031"
  tag "rid": "SV-87683r1_rule"
  tag "stig_id": "PGS9-00-010300"
  tag "cci": "CCI-002470"
  tag "nist": ["SC-23 (5)", "Rev_4"]
  tag "check": "As the database administrator (shown here as \"postgres\"), verify
the following setting in postgresql.conf:

$ sudo su - postgres
$ psql -c \"SHOW ssl_ca_file\"
$ psql -c \"SHOW ssl_cert_file\"

If the database is not configured to used approved certificates, this is a finding."
  tag "fix": "Revoke trust in any certificates not issued by a DoD-approved
certificate authority.

Configure PostgreSQL to accept only DoD and DoD-approved PKI end-entity certificates.

To configure PostgreSQL to accept approved CA's, see the official PostgreSQL
documentation: http://www.postgresql.org/docs/current/static/ssl-tcp.html

For more information on configuring PostgreSQL to use SSL, see supplementary content
APPENDIX-G."

  sql = postgres_session(PG_DBA, PG_DBA_PASSWORD, PG_HOST)

  describe sql.query('SHOW ssl_ca_file;', [PG_DB]) do
    its('output') { should_not eq '' }
  end

  describe sql.query('SHOW ssl_cert_file;', [PG_DB]) do
    its('output') { should_not eq '' }
  end
end