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create user test_user@localhost;
create role test_role1;
create role test_role2;
grant test_role1 to test_user@localhost;
grant test_role2 to test_role1;
select user, host from mysql.user where user not like 'root';
user host
test_role1
test_role2
test_user localhost
select * from mysql.roles_mapping;
Host User Role Admin_option
test_role1 test_role2 N
localhost root test_role1 Y
localhost root test_role2 Y
localhost test_user test_role1 N
grant select on mysql.roles_mapping to test_role2;
select * from mysql.roles_mapping;
ERROR 42000: SELECT command denied to user 'test_user'@'localhost' for table 'roles_mapping'
show grants;
Grants for test_user@localhost
GRANT USAGE ON *.* TO `test_user`@`localhost`
GRANT `test_role1` TO `test_user`@`localhost`
select current_user(), current_role();
current_user() current_role()
test_user@localhost NULL
set role test_role1;
select current_user(), current_role();
current_user() current_role()
test_user@localhost test_role1
show grants;
Grants for test_user@localhost
GRANT SELECT ON `mysql`.`roles_mapping` TO `test_role2`
GRANT USAGE ON *.* TO `test_role1`
GRANT USAGE ON *.* TO `test_role2`
GRANT USAGE ON *.* TO `test_user`@`localhost`
GRANT `test_role1` TO `test_user`@`localhost`
GRANT `test_role2` TO `test_role1`
select * from mysql.roles_mapping;
Host User Role Admin_option
test_role1 test_role2 N
localhost root test_role1 Y
localhost root test_role2 Y
localhost test_user test_role1 N
show grants;
Grants for test_user@localhost
GRANT SELECT ON `mysql`.`roles_mapping` TO `test_role2`
GRANT USAGE ON *.* TO `test_role1`
GRANT USAGE ON *.* TO `test_role2`
GRANT USAGE ON *.* TO `test_user`@`localhost`
GRANT `test_role1` TO `test_user`@`localhost`
GRANT `test_role2` TO `test_role1`
use mysql;
set role none;
select current_user(), current_role();
current_user() current_role()
test_user@localhost NULL
select * from mysql.roles_mapping;
ERROR 42000: SELECT command denied to user 'test_user'@'localhost' for table 'roles_mapping'
drop user 'test_user'@'localhost';
select * from mysql.tables_priv;
Host Db User Table_name Grantor Timestamp Table_priv Column_priv
mysql test_role2 roles_mapping root@localhost 0000-00-00 00:00:00 Select
revoke select on mysql.roles_mapping from test_role2;
delete from mysql.user where user like'test_%';
delete from mysql.roles_mapping where Role like 'test%';
flush privileges;
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