24th September 2020: PostgreSQL 13 Released!

Feature Description

Multifactor authentication via valid client SSL/TLS certificate

If an authentication entry in the pg_hba.conf specifies the clientcert=verify-full, then the client must present a valid SSL certificate that matches the login name, or the client name based on a map.

https://www.postgresql.org/docs/12/ssl-tcp.html#SSL-CLIENT-CERTIFICATES