MySQL 5.5.7 Adds New Authentication Capabilities
Support for pluggable authentication and proxy users is added for latest MySQL release.
MySQL version 5.5.7 has been released with changes to the
authentication process. MySQL authentication now supports new
capabilities: pluggable authentication and proxy users. The first,
allows the server to use plugins to authenticate incoming client
connections, and the second allows users to enable a client to have
the privileges of a different user. For more information on these
authentication changes, please see the Changes file.