MySQL 插件之 连接控制插件(Connection-Control)

• 插件介绍
• 插件安装
• 插件配置

插件介绍

MySQL 5.7.17 以后提供了Connection-Control插件用来控制客户端在登录操作连续失败一定次数后的响应的延迟。该插件可有效的防止客户端暴力登录的风险(攻击)。该插件包含以下2个组件

• CONNECTION_CONTROL：用来控制登录失败的次数及延迟响应时间
• CONNECTION_CONTROL_FAILED_LOGIN_ATTEMPTS：该表将登录失败的操作记录至IS库中

插件安装

-- 配置文件增加以下配置
[mysqld]
plugin-load-add									= connection_control.so
connection-control                             	= FORCE
connection-control-failed-login-attempts       	= FORCE
connection_control_min_connection_delay			= 1000
connection_control_max_connection_delay			= 86400
connection_control_failed_connections_threshold	= 3


-- 插件动态安装启用
mysql> INSTALL PLUGIN CONNECTION_CONTROL SONAME 'connection_control.so';
mysql> INSTALL PLUGIN CONNECTION_CONTROL_FAILED_LOGIN_ATTEMPTS SONAME 'connection_control.so';

-- 验证是否正常安装
mysql> SELECT PLUGIN_NAME, PLUGIN_STATUS 
FROM INFORMATION_SCHEMA.PLUGINS
WHERE PLUGIN_NAME LIKE 'connection%';

mysql> SHOW PLUGINS;

插件配置

-- 查看默认相关变量
mysql> show variables like 'connection_control%';
+-------------------------------------------------+------------+
| Variable_name                                   | Value      |
+-------------------------------------------------+------------+
| connection_control_failed_connections_threshold | 3          |
| connection_control_max_connection_delay         | 2147483647 |
| connection_control_min_connection_delay         | 1000       |
+-------------------------------------------------+------------+

-- 定制化配置
mysql> SET GLOBAL connection_control_failed_connections_threshold = 3;
mysql> SET GLOBAL connection_control_min_connection_delay = 1000;
mysql> SET GLOBAL connection_control_max_connection_delay = 86400;

-- 查看修改后的配置
mysql> show variables like 'connection_control%';
+-------------------------------------------------+-------+
| Variable_name                                   | Value |
+-------------------------------------------------+-------+
| connection_control_failed_connections_threshold | 3     |
| connection_control_max_connection_delay         | 86400 |
| connection_control_min_connection_delay         | 1000  |
+-------------------------------------------------+-------+

• connection_control_failed_connections_threshold
  • 失败尝试的次数，默认为3，表示当连接失败3次后启用连接控制，0表示不开启
• connection_control_max_connection_delay
  • 响应延迟的最大时间，默认约25天
• connection_control_min_connection_delay
  • 响应延迟的最小时间，默认1000微秒，1秒

-- 该表记录登录失败的用户及失败次数，当用户登录成功后，登录失败的记录则会被删除。
-- 重新配置connection_control_failed_connections_threshold变量，该表记录会被删除(重置)
-- 如果使用不存在的用户登录，则该表记录用户名为空，但会记录具体登录的IP
use information_schema;
select * from connection_control_failed_login_attempts;

-- 连接控制的使用次数(可用户判断是否存在暴力登录尝试)
-- 重新配置connection_control_failed_connections_threshold变量，该表记录会被删除(重置)
mysql> show global status like 'Connection_control_delay_generated';
+------------------------------------+-------+
| Variable_name                      | Value |
+------------------------------------+-------+
| Connection_control_delay_generated | 5     |
+------------------------------------+-------+