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Allow to connect with arbitrary plugin #2143

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@sidorares sidorares commented Jul 20, 2023

WIP

Currently mysql2 driver always tries to connect with mysql_native_password plugin. For the servers supporting PLUGIN_AUTH and configured to use plugins other than mysql_native_password initial connection is usually followed by AUTH_SWITCH_REQUEST packet and additional handshake with another plugin. This PR will allow to use plugins other than mysql_native_password in the initial client hello response. The order of preference on the plugin used during connection is:

  • if the server does not support plugin authorisation and secure auth server capability flag is set - mysql_native_password ( aka auth4.1 )
  • if the server does not support plugin authorisation and secure auth server capability flag is not set- pre auth4.1 token
  • plugin indicated by defaultAuthenticationPlugin config parameter name, if set ( error if the parameter is set but no standard or user provided plugin under this name )
  • plugin returned in auth_plugin_name server hello packet field ( error if plugin not configured )
  • "mysql_native_password" if no defaultAuthenticationPlugin or serverHello.auth_plugin_name

related issues:

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Coverage report

The coverage rate is 89.2977066514253%

The branch rate is 84.63687150837988%

100% of new lines are covered.

…andshake command and calculate it based on selected auth plugin
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