# Technical overview
Password is first sourced from ~/.my.cnf via
mysql:get-option('password','client'). In absence of this value, the account password is tested IFF the user has signed in through the UI authentication gate and [auth] => retain_ui_password is true. If either condition is false, SSO does not proceed prompting a user to enter their password.
Authentication is akin to connecting locally to MySQL using the sign-on username and supplied password,
mysql -u USERNAME -p PASSWORD. This platform makes a distinction between localhost and 127.0.0.1; moreover, ident-based authentication (SO_PEERCRED) is not used in MySQL authentication.
If prompted: the form-submitted password is applied to the above MySQL authentication routine. Upon successful authentication, the password is updated in ~/.my.cnf under [client] via
If authenticated: a login session is simulated with the client. A session succeeds if pmaUser-1, pmaPass-1, phpMyAdmin, pma_mcrypt_iv-1, and pma_pmaAuth-1 are present in the login in addition to a redirection to a location that contains a query string parameter "token". These are passed to PHPMYADMIN_LOCATION/dummyset.php?<param>=<val> to apply the cookies from a trusted origin.
PHPMYADMIN_LOCATION is determined by the fully-qualified node (
uname -n). This node must have a trusted SSL certificate to proceed (see SSL.md).