KingbaseESV8R6用户登录失败自动锁定后解锁遇到权限问题

测试用户登录失败自动锁定

创建用户tee并授权。

TEST=# create user tee;
CREATE ROLE
TEST=# alter user tee with createdb;
ALTER ROLE
TEST=#
TEST=# alter user tee with createrole;
ALTER ROLE
TEST=#
TEST=# alter role tee with replication;
ALTER ROLE
TEST=# alter user tee with password '1234';
ALTER ROLE
TEST=# \du
                                    List of roles
 Role name |                         Attributes                         | Member of
-----------+------------------------------------------------------------+------------
 sao       | No inheritance                                             | {}
 sso       | No inheritance                                             | {}
 system    | Superuser, Create role, Create DB, Replication, Bypass RLS | {}
 tee       | Create role, Create DB, Replication                        | {}

创建扩展，设置用户触及最大失败登录次数即锁定。

加载插件

修改 kingbase.conf 文件中shared_preload_libraries 参数。

shared_preload_libraries = 'sys_audlog'
create extension sys_audlog;

参数说明：

TEST=# \c - sso
You are now connected to database "TEST" as user "sso".
TEST=>
TEST=> ALTER SYSTEM SET sys_audlog.error_user_connect_times = 3;
ALTER SYSTEM
test=> CALL sys_reload_conf();
 sys_reload_conf
-----------------
 t
(1 row)

模拟tee用户登录失败超过最大次数。

[kingbase7@localhost data]$ ksql -UTEE -d test  -h 192.168.56.3  -W
Password:
ksql: error: could not connect to server: FATAL:  password authentication failed for user "tee"
NOTICE:  This is the 1 login failed. There are 2 left.
[kingbase7@localhost data]$ ksql -UTEE -d test  -h 192.168.56.3  -W
Password:
ksql: error: could not connect to server: FATAL:  password authentication failed for user "tee"
NOTICE:  This is the 2 login failed. There are 1 left.
[kingbase7@localhost data]$ ksql -UTEE -d test  -h 192.168.56.3  -W
Password:
ksql: error: could not connect to server: FATAL:  The user "tee" is locked.

登录失败次数达到3次后，用户tee被锁定，此时，即使密码正确也无法正常登录，需要解锁该用户。

解锁用户两种方法：

1.超过时间间隔参数自动解除用户封锁 sys_audlog.error_user_connect_interval (此方法略过)
2.用户可由具有 ALTER USER 权限的用户通过 SQL 语句进行手动解锁，解锁后用户登录的信息自动删除。

[kingbase7@localhost data]$ ksql -USSO -d test  -h 192.168.56.3 -c 'alter user tee with login;'
Password for user SSO:
ERROR:  must be superuser to alter replication users

报错原因是tee用户具有replication权限，所以sso用户不能为具有此权限的用户解锁。

根据官方文档描述，此命令执行用户需要sso安全用户执行。
如果用system用户执行会报以下错误：

[kingbase7@localhost data]$ ksql -USYSTEM -d test  -c 'alter user tee with login;'
ERROR:  permission denied, only sso can enable user

解决方法：

用system登录，取消replication权限，这是集群复制相关的权限，普通用户没有用处。

test=# alter user tee with noreplication;
ALTER ROLE
test=# \c - sso
You are now connected to database "test" as user "sso".
test=>
test=> alter user tee with login;
ALTER ROLE
test=>

此时可以正常解决，解锁后，tee用户可以正常登录。

[kingbase7@localhost data]$ ksql -UTEE -d test  -h 192.168.56.3  -W
Password:
ksql (V8.0)
Type "help" for help.

总结

虽然数据库提供了sso用户解锁因为异常登录被锁定的用户，但是遇到拥有特殊权限的用户就会解锁失败，这时需要把该权限回收后再次解锁。解锁失败的原因是由于三权分立特性，安全用户不能干预系统管理员的授权功能。