User authentication

User authentication system used for unified registry, login and administration of users by the tools used on the server. Services are all web with back end in PHP with exception of git that uses perl and git service. Tools used on system;

Email system with Exim and dovecot with multi domain and user data stored on postgresql database. Front end uses roundcubemail using postgresql but saving data on different database.
Pmwiki use simple mechanism of permissions based configuration file with passwords to protect global sections and pages.
Flayspray uses postgresql database, have it's own table based auth and permission system but also supports other's (?).
Tribushop? is a Opencart fork with goal of using php pdo and to support postgresql and mysql.

Check page psys for information about php system used to integrate tools.