[toc]

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 |

+------------------------------------+-------+