MySQLStudy之--MySQL用戶及權限管理
MySQL Study之--MySQL用戶及權限管理
MySQL服務器通過MySQL權限表來控制用戶對數據庫的訪問，MySQL權限表存放在mysql數據庫裡，由mysql_install_db腳本初始化。這些MySQL權限表分別user，db，table_priv，columns_priv和host。下面分別介紹一下這些表的結構和內容：
user權限表：記錄允許連接到服務器的用戶帳號信息，裡面的權限是全局級的。
db權限表：記錄各個帳號在各個數據庫上的操作權限。
table_priv權限表：記錄數據表級的操作權限。
columns_priv權限表：記錄數據列級的操作權限。
host權限表：配合db權限表對給定主機上數據庫級操作權限作更細致的控制。這個權限表不受GRANT和REVOKE語句的影響。
案例分析：
一、創建用戶並授權（root用戶)
[root@mysrv ~]# mysql -u root -poracle
mysql> select version()\g
+-------------------------------------------+
| version() |
+-------------------------------------------+
| 5.6.25-enterprise-commercial-advanced-log |
+-------------------------------------------+
1 row in set (0.00 sec)
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| prod |
| test |
+--------------------+
5 rows in set (0.01 sec)
1、建立tom用戶並授權（特權管理用戶）
mysql> grant all on prod.* to 'tom'@'%' identified by 'tom' with grant option;
Query OK, 0 rows affected (0.00 sec)
查看用戶創建是否成功：
mysql> select user,host from user ;
+-------+-----------+
| user | host |
+-------+-----------+
| tom | % |
| root | 127.0.0.1 |
| root | ::1 |
| | localhost |
| root | localhost |
| scott | localhost |
| | mysrv |
| root | mysrv |
+-------+-----------+
8 rows in set (0.00 sec)
查看tom用戶的授權：
mysql> show grants for tom;
+----------------------------------------------------------------------------------------------------+
| Grants for tom@% |
+----------------------------------------------------------------------------------------------------+
| GRANT USAGE ON *.* TO 'tom'@'%' IDENTIFIED BY PASSWORD '*71FF744436C7EA1B954F6276121DB5D2BF68FC07' |
| GRANT ALL PRIVILEGES ON `prod`.* TO 'tom'@'%' WITH GRANT OPTION |
+----------------------------------------------------------------------------------------------------+
GRANT 語法:
GRANT privileges (columns)
ON what
TO user IDENTIFIED BY "password"
WITH GRANT OPTION
權限列表:
ALTER: 修改表和索引。
CREATE: 創建數據庫和表。
DELETE: 刪除表中已有的記錄。
DROP: 拋棄(刪除)數據庫和表。
INDEX: 創建或拋棄索引。
INSERT: 向表中插入新行。
REFERENCE: 未用。
SELECT: 檢索表中的記錄。
UPDATE: 修改現存表記錄。
FILE: 讀或寫服務器上的文件。
PROCESS: 查看服務器中執行的線程信息或殺死線程。
RELOAD: 重載授權表或清空日志、主機緩存或表緩存。
SHUTDOWN: 關閉服務器。
ALL: 所有權限，ALL PRIVILEGES同義詞。
USAGE: 特殊的 "無權限" 權限。
用 戶賬戶包括 "username" 和 "host" 兩部分，後者表示該用戶被允許從何地接入。tom@'%' 表示任何地址，默認可以省略。還可以是 "
[email protected].%"、"tom@%.abc.com" 等。數據庫格式為 db@table，可以是 "test.*" 或 "*.*"，前者表示 test 數據庫的所有表，後者表示所有數據庫的所有表。
子句 "WITH GRANT OPTION" 表示該用戶可以為其他用戶分配權限。
2、我們用 root 再創建幾個用戶，然後由 test 數據庫的管理員tom為他們分配權限。
mysql> create user 'tom1' identified by 'tom1' ,'tom2' identified by 'tom2';
Query OK, 0 rows affected (0.00 sec)
mysql> select user,host from user ;
+-------+-----------+
| user | host |
+-------+-----------+
| tom | % |
| tom1 | % |
| tom2 | % |
| root | 127.0.0.1 |
| root | ::1 |
| | localhost |
| root | localhost |
| scott | localhost |
| | mysrv |
| root | mysrv |
+-------+-----------+
10 rows in set (0.00 sec)
root用戶退出，tom登陸，並授權用戶訪問prod庫
[root@mysrv ~]# mysql -u tom -ptom
ERROR 1045 (28000): Access denied for user 'tom'@'localhost' (using password: YES)
tom用戶竟不能登陸！！！
再對tom用戶授權：
mysql> grant all on prod.* to 'tom'@'localhost' identified by 'tom' with grant option;;
Query OK, 0 rows affected (0.00 sec)
mysql> show grants for tom;
+----------------------------------------------------------------------------------------------------+
| Grants for tom@% |
+----------------------------------------------------------------------------------------------------+
| GRANT USAGE ON *.* TO 'tom'@'%' IDENTIFIED BY PASSWORD '*71FF744436C7EA1B954F6276121DB5D2BF68FC07' |
| GRANT ALL PRIVILEGES ON `prod`.* TO 'tom'@'%' WITH GRANT OPTION |
+----------------------------------------------------------------------------------------------------+
2 rows in set (0.00 sec)
mysql> use mysql;
Database changed
mysql> select user,host from user ;
+-------+-----------+
| user | host |
+-------+-----------+
| tom | % |
| tom1 | % |
| tom2 | % |
| root | 127.0.0.1 |
| root | ::1 |
| | localhost |
| root | localhost |
| scott | localhost |
| tom | localhost |
| | mysrv |
| root | mysrv |
+-------+-----------+
11 rows in set (0.00 sec)
tom登陸：
[root@mysrv ~]# mysql -u tom -ptom prod
mysql> select database();
+------------+
| database() |
+------------+
| prod |
+------------+
1 row in set (0.01 sec)
mysql> select current_user();
+----------------+
| current_user() |
+----------------+
| tom@localhost |
+----------------+
1 row in set (0.00 sec)
創建表：
mysql> show tables;
+----------------+
| Tables_in_prod |
+----------------+
| t1 |
+----------------+
1 row in set (0.00 sec)
mysql> create table t2 as select * from t1;
Query OK, 3 rows affected (0.15 sec)
Records: 3 Duplicates: 0 Warnings: 0
查看表信息：
mysql> desc t2;
+-------+-------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+-------------+------+-----+---------+-------+
| id | int(11) | YES | | NULL | |
| name | varchar(10) | YES | | NULL | |
+-------+-------------+------+-----+---------+-------+
2 rows in set (0.01 sec)
mysql> show create table t2;
+-------+---------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table |
+-------+---------------------------------------------------------------------------------------------------------------------------+
| t2 | CREATE TABLE `t2` (
`id` int(11) DEFAULT NULL,
`name` varchar(10) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
+-------+---------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.01 sec)
mysql> show create table t2\G;
*************************** 1. row ***************************
Table: t2
Create Table: CREATE TABLE `t2` (
`id` int(11) DEFAULT NULL,
`name` varchar(10) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1
1 row in set (0.00 sec)
mysql> select * from t2;
+------+-------+
| id | name |
+------+-------+
| 10 | tom |
| 20 | jerry |
| 30 | rose |
+------+-------+
3 rows in set (0.00 sec)
3、tom用戶為tom1，tom2授權
mysql> grant select on prod.* to tom1;
Query OK, 0 rows affected (0.00 sec)
mysql> grant select on prod.* to tom2;
Query OK, 0 rows affected (0.02 sec)
mysql> grant insert,update on prod.* to tom2;
Query OK, 0 rows affected (0.00 sec)
tom2登陸（從遠程登陸）：
C:\Users\Administrator>mysql -h 192.168.8.240 -utom2 -ptom2
mysql> select database();
+------------+
| database() |
+------------+
| NULL |
+------------+
1 row in set (0.00 sec)
mysql> use prod;
Database changed
mysql> select database();
+------------+
| database() |
+------------+
| prod |
+------------+
1 row in set (0.00 sec)
mysql> select current_user();
+----------------+
| current_user() |
+----------------+
| tom2@% |
+----------------+
1 row in set (0.00 sec)
mysql> show grants for tom2;
+------------------------------------------------------------------+
| Grants for tom2@% |
+------------------------------------------------------------------+
| GRANT USAGE ON *.* TO 'tom2'@'%' IDENTIFIED BY PASSWORD
|
| GRANT SELECT, INSERT, UPDATE ON `prod`.* TO 'tom2'@'%' |
+------------------------------------------------------------------+
2 rows in set (0.00 sec)
mysql> show tables;
+----------------+
| Tables_in_prod |
+----------------+
| t1 |
| t2 |
+----------------+
2 rows in set (0.00 sec)
mysql> select * from t1;
+------+-------+
| id | name |
+------+-------+
| 10 | tom |
| 20 | jerry |
| 30 | rose |
+------+-------+
3 rows in set (0.00 sec)
mysql> select * from t2;
+------+-------+
| id | name |
+------+-------+
| 10 | tom |
| 20 | jerry |
| 30 | rose |
+------+-------+
3 rows in set (0.00 sec)
mysql> insert into t1 values (40,'john');
Query OK, 1 row affected (0.00 sec)
mysql> commit;
Query OK, 0 rows affected (0.09 sec)
mysql> select * from t1;
+------+-------+
| id | name |
+------+-------+
| 10 | tom |
| 20 | jerry |
| 30 | rose |
| 40 | john |
+------+-------+
4 rows in set (0.00 sec)
mysql> update t1 set name='ellen' where id=40;
Query OK, 1 row affected (0.01 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> select * from t1;
+------+-------+
| id | name |
+------+-------+
| 10 | tom |
| 20 | jerry |
| 30 | rose |
| 40 | ellen |
+------+-------+
4 rows in set (0.00 sec)
mysql> delete from t1;
ERROR 1142 (42000): DELETE command denied to user 'tom2'@'192.168.8.254' for tab
le 't1'
mysql> commit;
Query OK, 0 rows affected (0.05 sec)
mysql> select * from t1;
+------+-------+
| id | name |
+------+-------+
| 10 | tom |
| 20 | jerry |
| 30 | rose |
| 40 | ellen |
+------+-------+
4 rows in set (0.00 sec)
4、回收tom2的update權限：
mysql> revoke update on prod.* from tom2;
Query OK, 0 rows affected (0.00 sec)
tom2再重新登陸：
C:\Users\Administrator>mysql -h 192.168.8.240 -utom2 -ptom2
mysql> use prod;
Database changed
mysql> update t1 set name='lily' where id=10;
ERROR 1142 (42000): UPDATE command denied to user 'tom2'@'192.168.8.254' for tab
le 't1'
---update失敗！
二、修改用戶口令：
1、root用戶修改普通用戶口令
mysql> set password for tom1=password('oracle');
Query OK, 0 rows affected (0.01 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
tom1重新登陸：
C:\Users\Administrator>mysql -h 192.168.8.240 -utom1 -ptom1
Warning: Using a password on the command line interface can be insecure.
ERROR 1045 (28000): Access denied for user 'tom1'@'192.168.8.254' (using passwor
d: YES)
---舊口令登陸失敗！
C:\Users\Administrator>mysql -h 192.168.8.240 -utom1 -poracle
mysql>
2、普通用戶修改自己密碼：
C:\Users\Administrator>mysql -h 192.168.8.240 -utom1 -poracle
mysql> set password=password('tom1');
Query OK, 0 rows affected (0.00 sec)
重新登陸：
C:\Users\Administrator>mysql -h 192.168.8.240 -utom1 -ptom1
mysql>
---新密碼登陸成功 ！
三、刪除用戶：
1、回收用戶所有權限
mysql> revoke all on prod.* from tom2;
Query OK, 0 rows affected (0.01 sec)
2、刪除用戶
mysql> drop user tom2;
Query OK, 0 rows affected (0.00 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
mysql> select user,host from user;
+-------+-----------+
| user | host |
+-------+-----------+
| jerry | % |
| rose | % |
| tom | % |
| tom1 | % |
| root | 127.0.0.1 |
| root | ::1 |
| | localhost |
| jerry | localhost |
| root | localhost |
| rose | localhost |
| scott | localhost |
| tom | localhost |
| | mysrv |
| root | mysrv |
+-------+-----------+
14 rows in set (0.00 sec)
------- 摘要 --------------------------------------
創建用戶:
GRANT insert, update ON testdb.* TO user1@'%' IDENTIFIED BY 'password' WITH GRANT OPTION;
CREATE USER user2 IDENTIFIED BY 'password';
分配權限:
GRANT select ON testdb.* TO user2;
查看權限:
SHOW GRANTS FOR user1;
修改密碼:
SET PASSWORD FOR user1 = PASSWORD('newpwd');
SET PASSWORD = PASSWORD('newpwd');
移除權限:
REVOKE all ON *.* FROM user1;
刪除用戶:
DROP USER user1;
數據庫列表:
SHOW DATABASES;
數據表列表:
SHOW TABLES;
當前數據庫:
SELECT DATABASE();
當前用戶:
SELECT USER();
數據表結構:
DESCRIBE table1;
刷新權限:
FLUSH PRIVILEGES;
grant和revoke可以在幾個層次上控制訪問權限
1，整個服務器，使用 grant ALL 和revoke ALL
2，整個數據庫，使用on database.*
3，特點表，使用on database.table
4，特定的列
5，特定的存儲過程
user表中host列的值的意義
% 匹配所有主機
localhost localhost不會被解析成IP地址，直接通過UNIXsocket連接
127.0.0.1 會通過TCP/IP協議連接，並且只能在本機訪問；
::1 ::1就是兼容支持ipv6的，表示同ipv4的127.0.0.1
grant 普通數據用戶，查詢、插入、更新、刪除 數據庫中所有表數據的權利。
grant select on testdb.* to common_user@’%’
grant insert on testdb.* to common_user@’%’
grant update on testdb.* to common_user@’%’
grant delete on testdb.* to common_user@’%’
或者，用一條 MySQL 命令來替代：
grant select, insert, update, delete on testdb.* to common_user@’%’
grant 數據庫開發人員，創建表、索引、視圖、存儲過程、函數。。。等權限。
grant 創建、修改、刪除 MySQL 數據表結構權限。
grant create on testdb.* to developer@’192.168.0.%’;
grant alter on testdb.* to developer@’192.168.0.%’;
grant drop on testdb.* to developer@’192.168.0.%’;
grant 操作 MySQL 外鍵權限。
grant references on testdb.* to developer@’192.168.0.%’;
grant 操作 MySQL 臨時表權限。
grant create temporary tables on testdb.* to developer@’192.168.0.%’;
grant 操作 MySQL 索引權限。
grant index on testdb.* to developer@’192.168.0.%’;
grant 操作 MySQL 視圖、查看視圖源代碼 權限。
grant create view on testdb.* to developer@’192.168.0.%’;
grant show view on testdb.* to developer@’192.168.0.%’;
grant 操作 MySQL 存儲過程、函數 權限。
grant create routine on testdb.* to developer@’192.168.0.%’; -- now, can show procedure status
grant alter routine on testdb.* to developer@’192.168.0.%’; -- now, you can drop a procedure
grant execute on testdb.* to developer@’192.168.0.%’;
grant 普通 DBA 管理某個 MySQL 數據庫的權限。
grant all privileges on testdb to dba@’localhost’
其中，關鍵字 “privileges” 可以省略。
grant 高級 DBA 管理 MySQL 中所有數據庫的權限。
grant all on *.* to dba@’localhost’
MySQL grant 權限，分別可以作用在多個層次上。
1. grant 作用在整個 MySQL 服務器上：
grant select on *.* to dba@localhost; -- dba 可以查詢 MySQL 中所有數據庫中的表。
grant all on *.* to dba@localhost; -- dba 可以管理 MySQL 中的所有數據庫
2. grant 作用在單個數據庫上：
grant select on testdb.* to dba@localhost; -- dba 可以查詢 testdb 中的表。
3. grant 作用在單個數據表上：
grant select, insert, update, delete on testdb.orders to dba@localhost;
4. grant 作用在表中的列上：
grant select(id, se, rank) on testdb.apache_log to dba@localhost;
5. grant 作用在存儲過程、函數上：
grant execute on procedure testdb.pr_add to ’dba’@’localhost’
grant execute on function testdb.fn_add to ’dba’@’localhost’
注意：修改完權限以後 一定要刷新服務，或者重啟服務，刷新服務用：FLUSH PRIVILEGES。
