https://jira.mariadb.org/browse/MDEV-33479
[MDEV-33479] Extend Unix socket authentication to support authentication_string - Jira
unix socketmdevextendsupport
https://mariadb.com/docs/server/reference/plugins/authentication-plugins/authentication-plugin-unix-socket
Authentication Plugin - Unix Socket | Server | MariaDB Documentation
Official Unix socket authentication: OS user login via SO_PEERCRED/uid matching, CREATE USER IDENTIFIED VIA unix_socket, and unix_socket force modes.
server mariadb documentation