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前言
最近在工作中遇到一个需求：修改mysql用户的权限，需要限制特定ip地址才能访问，第一次遇到这类需求，结果在测试过程，使用更新系统权限报发现出现了一些问题， 具体演示如下.
注意：下面测试环境为mysql 5.6.20. 如有其它版本与下面测试结果有出入，请以实际环境为准。
我们先创建一个测试用户limitip，只允许192.168段的ip地址访问，具体权限如下所示：
mysql> grant select on mydb.* to limitip@'192.168.%' identified by 'limitip';
query ok, 0 rows affected (0.01 sec)
mysql> grant insert ,update,delete on mydb.kkk to limitip@'192.168.%';
query ok, 0 rows affected (0.00 sec)
mysql>
mysql> flush privileges;
query ok, 0 rows affected (0.00 sec)
mysql>
mysql> show grants for limitip@'192.168.%';
+----------------------------------------------------------------------------------------------------------------+
| grants for limitip@192.168.% |
+----------------------------------------------------------------------------------------------------------------+
| grant usage on *.* to 'limitip'@'192.168.%' identified by password '*72dde03e02cc55a9478a82f3f4ebe7f639249dec' |
| grant select on `mydb`.* to 'limitip'@'192.168.%' |
| grant insert, update, delete on `mydb`.`kkk` to 'limitip'@'192.168.%' |
+----------------------------------------------------------------------------------------------------------------+
3 rows in set (0.00 sec)
mysql>
假设现在收到需求：这个用户只允许这个ip地址192.168.103.17访问，于是我打算更新mysql.user表，如下所示：
mysql> select user, host from mysql.user where user='limitip';
+---------+-----------+
| user | host |
+---------+-----------+
| limitip | 192.168.% |
+---------+-----------+
1 row in set (0.00 sec)
mysql> update mysql.user set host='192.168.103.17' where user='limitip';
query ok, 1 row affected (0.02 sec)
rows matched: 1 changed: 1 warnings: 0
mysql> flush privileges;
query ok, 0 rows affected (0.01 sec)
mysql> select user, host from user where user='limitip';
error 1046 (3d000): no database selected
mysql> use mysql;
reading table information for completion of table and column names
you can turn off this feature to get a quicker startup with -a
database changed
mysql> select user, host from user where user='limitip';
+---------+----------------+
| user | host |
+---------+----------------+
| limitip | 192.168.103.17 |
+---------+----------------+
1 row in set (0.00 sec)
mysql> show grants for limitip@'192.168.103.17';
+---------------------------------------------------------------------------------------------------------------------+
| grants for limitip@192.168.103.17 |
+---------------------------------------------------------------------------------------------------------------------+
| grant usage on *.* to 'limitip'@'192.168.103.17' identified by password '*72dde03e02cc55a9478a82f3f4ebe7f639249dec' |
+---------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
mysql>
上面测试发现，如果这样只修改mysql.user表， 那么之前的权限没有了，如下所示，如果你查询mysql.db、 mysql.tables_priv 发现host的字段值依然为192.168.%
mysql> select * from mysql.db where user='limitip'\g;
*************************** 1. row ***************************
host: 192.168.%
db: mydb
user: limitip
select_priv: y
insert_priv: n
update_priv: n
delete_priv: n
create_priv: n
drop_priv: n
grant_priv: n
references_priv: n
index_priv: n
alter_priv: n
create_tmp_table_priv: n
lock_tables_priv: n
create_view_priv: n
show_view_priv: n
create_routine_priv: n
alter_routine_priv: n
execute_priv: n
event_priv: n
trigger_priv: n
1 row in set (0.00 sec)
error:
no query specified
mysql> select * from mysql.tables_priv where user='limitip'\g;
*************************** 1. row ***************************
host: 192.168.%
db: mydb
user: limitip
table_name: kkk
grantor: root@localhost
timestamp: 0000-00-00 00:00:00
table_priv: insert,update,delete
column_priv:
1 row in set (0.00 sec)
error:
no query specified
所以我继续修改 mysql.db、 mysql.tables_priv 表，然后测试验证终于ok了（请见下面测试步骤），当然如果账户的权限不止这几个层面，你可能还必须修改例如mysql.columns_priv、mysql.procs_priv等表
mysql> show grants for limitip@'192.168.%';
error 1141 (42000): there is no such grant defined for user 'limitip' on host '192.168.%'
mysql>
mysql>
mysql> update mysql.db set host='192.168.103.17' where user='limitip';
query ok, 1 row affected (0.00 sec)
rows matched: 1 changed: 1 warnings: 0
mysql> update mysql.tables_priv set host='192.168.103.17' where user='limitip';
query ok, 1 row affected (0.00 sec)
rows matched: 1 changed: 1 warnings: 0
mysql> flush privileges;
query ok, 0 rows affected (0.00 sec)
mysql> show grants for limitip@'192.168.103.17';
+---------------------------------------------------------------------------------------------------------------------+
| grants for limitip@192.168.103.17 |
+---------------------------------------------------------------------------------------------------------------------+
| grant usage on *.* to 'limitip'@'192.168.103.17' identified by password '*72dde03e02cc55a9478a82f3f4ebe7f639249dec' |
| grant select on `mydb`.* to 'limitip'@'192.168.103.17' |
| grant insert, update, delete on `mydb`.`kkk` to 'limitip'@'192.168.103.17' |
+---------------------------------------------------------------------------------------------------------------------+
3 rows in set (0.00 sec)
mysql>
如果需要修改用户的ip限制，其实更新mysql相关权限表不是上上策，其实有更好的方法，那就是rename user syntax
mysql> rename user 'limitip'@'192.168.103.17' to 'limitip'@'192.168.103.18';
query ok, 0 rows affected (0.00 sec)
mysql> flush privileges;
query ok, 0 rows affected (0.00 sec)
mysql> show grants for 'limitip'@'192.168.103.18';
+---------------------------------------------------------------------------------------------------------------------+
| grants for limitip@192.168.103.18 |
+---------------------------------------------------------------------------------------------------------------------+
| grant usage on *.* to 'limitip'@'192.168.103.18' identified by password '*72dde03e02cc55a9478a82f3f4ebe7f639249dec' |
| grant select on `mydb`.* to 'limitip'@'192.168.103.18' |
| grant insert, update, delete on `mydb`.`kkk` to 'limitip'@'192.168.103.18' |
+---------------------------------------------------------------------------------------------------------------------+
3 rows in set (0.00 sec)
mysql>
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