mysql_no_login server-side authentication
plugin prevents all client connections to any account that uses
it. Use cases for such a plugin include proxied accounts that
should never permit direct login but are accessed only through
proxy accounts and accounts that must be able to execute stored
programs and views with elevated privileges without exposing
those privileges to ordinary users.
The following table shows the plugin and library file names. The
file name suffix might differ on your system. The file must be
located in the directory named by the
plugin_dir system variable.
Table 6.19 Plugin and Library Names for No-Login Authentication
|Plugin or File||Plugin or File Name|
The following sections provide installation and usage information specific to no-login pluggable authentication:
This section describes how to install the no-login authentication plugin. For general information about installing plugins, see Section 5.6.1, “Installing and Uninstalling Plugins”.
To be usable by the server, the plugin library file must be
located in the MySQL plugin directory (the directory named by
variable). If necessary, configure the plugin directory
location by setting the value of
plugin_dir at server startup.
The plugin library file base name is
mysql_no_login. The file name suffix
differs per platform (for example,
for Unix and Unix-like systems,
To load the plugin at server startup, use the
--plugin-load-add option to
name the library file that contains it. With this
plugin-loading method, the option must be given each time the
server starts. For example, put these lines in the server
my.cnf file (adjust the
.so suffix for your platform as
my.cnf, restart the
server to cause the new settings to take effect.
Alternatively, to register the plugin at runtime, use this
statement (adjust the
.so suffix as
INSTALL PLUGIN mysql_no_login SONAME 'mysql_no_login.so';
INSTALL PLUGIN loads the plugin
immediately, and also registers it in the
mysql.plugins system table to cause the
server to load it for each subsequent normal startup.
To verify plugin installation, examine the
or use the
Section 5.6.2, “Obtaining Server Plugin Information”). For example:
mysql> SELECT PLUGIN_NAME, PLUGIN_STATUS FROM INFORMATION_SCHEMA.PLUGINS WHERE PLUGIN_NAME LIKE '%login%'; +----------------+---------------+ | PLUGIN_NAME | PLUGIN_STATUS | +----------------+---------------+ | mysql_no_login | ACTIVE | +----------------+---------------+
If the plugin fails to initialize, check the server error log for diagnostic messages.
To associate MySQL accounts with the no-login plugin, see Using No-Login Pluggable Authentication.
The method used to uninstall the no-login authentication plugin depends on how you installed it:
This section describes how to use the no-login authentication plugin to prevent connections from MySQL client programs to the server. It is assumed that the server is running with the server-side plugin enabled, as described in Installing No-Login Pluggable Authentication.
To refer to the no-login authentication plugin in the
IDENTIFIED WITH clause of a
CREATE USER statement, use the
An account that authenticates using
mysql_no_login may be used as the
DEFINER for stored program and view
objects. If such an object definition also includes
SQL SECURITY DEFINER, it executes with that
account's privileges. DBAs can use this behavior to provide
access to confidential or sensitive data that is exposed only
through well-controlled interfaces.
The following example provides a simple illustration of these
principles. It defines an account that does not permit client
connections, and associates with it a view that exposes only
certain columns of the
CREATE DATABASE nologindb; CREATE USER 'nologin'@'localhost' IDENTIFIED WITH mysql_no_login; GRANT ALL ON nologindb.* TO 'nologin'@'localhost'; GRANT SELECT ON mysql.user TO 'nologin'@'localhost'; CREATE DEFINER = 'nologin'@'localhost' SQL SECURITY DEFINER VIEW nologindb.myview AS SELECT User, Host FROM mysql.user;
To provide protected access to the view to an ordinary user, do this:
GRANT SELECT ON nologindb.myview TO 'ordinaryuser'@'localhost';
Now the ordinary user can use the view to access the limited information it presents:
SELECT * FROM nologindb.myview;
Attempts by the user to access columns other than those exposed by the view result in an error, as do all attempts to select from the view by users not granted access to it.
nologin account cannot be
used directly, the operations required to set up objects
that it uses must be performed by
similar account with the privileges required to create the
objects and set
An account that authenticates using
mysql_no_login may be used as a proxied
base user for proxy accounts:
-- create proxied account CREATE USER 'proxy_base'@'localhost' IDENTIFIED WITH mysql_no_login; -- grant privileges to proxied account GRANT ... TO 'proxy_base'@'localhost'; -- permit real_user to be proxy for proxied account GRANT PROXY ON 'proxy_base'@'localhost' TO 'real_user'@'localhost';
This enables clients to access MySQL through the proxy account
real_user) but not to bypass the proxy
mechanism by connecting directly as the proxied user