技术分享|安全地无密码登录MySQL

database

作者:丹尼尔·古斯曼布尔戈斯

翻译:管长龙

原文:https://www.percona.com/blog/2019/11/01/use-mysql-without-a-password/

有人说最好的密码就是你不用记忆的。auth_socket 插件和 MariaDB 的 unix_socket 让这种想法在 MySQL 上变成可能。

  • auth_socket:https://dev.mysql.com/doc/refman/8.0/en/socket-pluggable-authentication.html

  • unix_socket:https://mariadb.com/kb/en/library/authentication-plugin-unix-socket/

这两个插件虽然不是新发布,但在 MariaDB 10.4 上 unix_socket 已经默认安装,并且是身份验证方法之一。

插件的安装和使用

如上所述,这不是新功能,即使使用 Debian 团队维护的 .deb 安装包安装 MySQL,也会创建 root 用户,以便使用套接字身份验证,对于 MySQL 和 MariaDB 都是如此:

root@app:~# apt-cache show mysql-server-5.7 | grep -i maintainers

Original-Maintainer: Debian MySQL Maintainers <pkg-mysql-maint@lists.alioth.debian.org>

Original-Maintainer: Debian MySQL Maintainers <<a href="mailto:pkg-mysql-maint@lists.alioth.debian.org">pkg-mysql-maint@lists.alioth.debian.org</a>>

安装后,root 用户验证过程如下:

root@app:~# whoami

root

root@app:~# mysql

Welcome to the MySQL monitor. Commands end with ; or g.

Your MySQL connection id is 4

Server version: 5.7.27-0ubuntu0.16.04.1 (Ubuntu)

Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type "help;" or "h" for help. Type "c" to clear the current input statement.

mysql> select user, host, plugin, authentication_string from mysql.user where user = "root";

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

| user | host | plugin | authentication_string |

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

| root | localhost | auth_socket | |

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

1 row in set (0.01 sec)

与 MariaDB 相同:

10.0.38-MariaDB-0ubuntu0.16.04.1 Ubuntu 16.04

MariaDB [(none)]> show grants;

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

| Grants for root@localhost |

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

| GRANT ALL PRIVILEGES ON *.* TO "root"@"localhost" IDENTIFIED VIA unix_socket WITH GRANT OPTION |

| GRANT PROXY ON ""@"%" TO "root"@"localhost" WITH GRANT OPTION |

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

2 rows in set (0.00 sec)

对于 Percona Server,来自官方 Percona Repo 的 .deb 软件包还将 root 用户身份验证设置为 auth_socket。这是适用于 MySQL 8.0.16-7 和 Ubuntu 16.04 的 Percona Server 的示例:

root@app:~# whoami

root

root@app:~# mysql

Welcome to the MySQL monitor. Commands end with ; or g.

Your MySQL connection id is 9

Server version: 8.0.16-7 Percona Server (GPL), Release "7", Revision "613e312"

Copyright (c) 2009-2019 Percona LLC and/or its affiliates

Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type "help;" or "h" for help. Type "c" to clear the current input statement.

mysql> select user, host, plugin, authentication_string from mysql.user where user ="root";

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

| user | host | plugin | authentication_string |

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

| root | localhost | auth_socket | |

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

1 row in set (0.00 sec)

那么,为何如此神奇?该插件使用 SO_PEERCRED 套接字选项,来检查 Linux 用户是否于 MySQL 用户匹配,以获取有关运行客户端程序的用户信息。因此该插件只能在支持 SO_PEERCRED 选项的系统上使用,例如: Linux。 SO_PEERCRED 套接字选项允许检索连接到套接字的进程 uid。然后,他可以获取与 uid 关联的用户名。

vagrant@mysql1:~$ whoami

vagrant

vagrant@mysql1:~$ mysql

ERROR 1698 (28000): Access denied for user "vagrant"@"localhost"

由于 MySQL 不存在 "vagrant" 用户,因此访问被拒绝。让我们创建用户再次尝试:

MariaDB [(none)]> GRANT ALL PRIVILEGES ON *.* TO "vagrant"@"localhost" IDENTIFIED VIA unix_socket;

Query OK, 0 rows affected (0.00 sec)

vagrant@mysql1:~$ mysql

Welcome to the MariaDB monitor. Commands end with ; or g.

Your MariaDB connection id is 45

Server version: 10.0.38-MariaDB-0ubuntu0.16.04.1 Ubuntu 16.04

Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.

Type "help;" or "h" for help. Type "c" to clear the current input statement.

MariaDB [(none)]> show grants;

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

| Grants for vagrant@localhost |

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

| GRANT ALL PRIVILEGES ON *.* TO "vagrant"@"localhost" IDENTIFIED VIA unix_socket |

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

1 row in set (0.00 sec)

成功!!

现在,让我们在 CentOS 7 上安装的 Percona Server 版本 MySQL 8 上再试一试:

mysql> show variables like "%version%comment";

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

| Variable_name | Value |

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

| version_comment | Percona Server (GPL), Release 7, Revision 613e312 |

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

1 row in set (0.01 sec)

mysql> CREATE USER "percona"@"localhost" IDENTIFIED WITH auth_socket;

ERROR 1524 (HY000): Plugin "auth_socket" is not loaded

失败了,原因是插件未加载:

mysql> pager grep socket

PAGER set to "grep socket"

mysql> show plugins;

47 rows in set (0.00 sec)

让我们在运行时添加插件:

mysql> nopager

PAGER set to stdout

mysql> INSTALL PLUGIN auth_socket SONAME "auth_socket.so";

Query OK, 0 rows affected (0.00 sec)

mysql> pager grep socket; show plugins;

PAGER set to "grep socket"

| auth_socket | ACTIVE | AUTHENTICATION | auth_socket.so | GPL |

48 rows in set (0.00 sec)

现在我们有了所需的一切。让我们再试一次:

mysql> CREATE USER "percona"@"localhost" IDENTIFIED WITH auth_socket;

Query OK, 0 rows affected (0.01 sec)

mysql> GRANT ALL PRIVILEGES ON *.* TO "percona"@"localhost";

Query OK, 0 rows affected (0.01 sec)

现在我们可以以操作系统用户 "percona" 的身份登录。

[percona@ip-192-168-1-111 ~]$ whoami

percona

[percona@ip-192-168-1-111 ~]$ mysql -upercona

Welcome to the MySQL monitor. Commands end with ; or g.

Your MySQL connection id is 19

Server version: 8.0.16-7 Percona Server (GPL), Release 7, Revision 613e312

Type "help;" or "h" for help. Type "c" to clear the current input statement.

mysql> select user, host, plugin, authentication_string from mysql.user where user ="percona";

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

| user | host | plugin | authentication_string |

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

| percona | localhost | auth_socket | |

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

1 row in set (0.00 sec)

再次成功!

问题:我可以尝试以其他的系统用户的身份使用 percona 登录吗?

[percona@ip-192-168-1-111 ~]$ logout

[root@ip-192-168-1-111 ~]# mysql -upercona

ERROR 1698 (28000): Access denied for user "percona"@"localhost"

不,你不能!

结论

MySQL 在多个方面都足够灵活,其中之一就是身份验证方法。正如我们在这篇文章中所看到的,依靠系统用户可以在没有密码的情况下进行访问。这在几种情况下很有用,但仅提及一种情况:从 RDS / Aurora 迁移到常规 MySQL 并使用 IAM 数据库身份验证保持访问而无需使用密码。

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