create user test_user@localhost;
create role test_role;
create role not_granted_role;
grant select on *.* to test_role;
grant test_role to test_user@localhost;
show grants;
Grants for test_user@localhost
GRANT `test_role` TO `test_user`@`localhost`
GRANT USAGE ON *.* TO `test_user`@`localhost`
select user, host, default_role from mysql.user;
ERROR 42000: SELECT command denied to user 'test_user'@'localhost' for table `mysql`.`user`
set default role invalid_role;
ERROR OP000: Invalid role specification `invalid_role`
set default role not_granted_role;
ERROR OP000: Invalid role specification `not_granted_role`
set default role test_role;
select user, host, default_role from mysql.user;
ERROR 42000: SELECT command denied to user 'test_user'@'localhost' for table `mysql`.`user`
select user, host, default_role from mysql.user where user='test_user';
User	Host	default_role
test_user	localhost	test_role
show grants;
Grants for test_user@localhost
GRANT `test_role` TO `test_user`@`localhost`
GRANT USAGE ON *.* TO `test_user`@`localhost`
GRANT SELECT ON *.* TO `test_role`
SET DEFAULT ROLE `test_role` FOR `test_user`@`localhost`
select user, host, default_role from mysql.user where user='test_user';
User	Host	default_role
test_user	localhost	test_role
set default role invalid_role;
ERROR OP000: Invalid role specification `invalid_role`
select user, host, default_role from mysql.user where user='test_user';
User	Host	default_role
test_user	localhost	test_role
revoke test_role from test_user@localhost;
select user, host, default_role from mysql.user where user='test_user';
ERROR 42000: SELECT command denied to user 'test_user'@'localhost' for table `mysql`.`user`
drop role test_role;
drop role not_granted_role;
drop user test_user@localhost;
#
# MDEV-22312: Bad error message for SET DEFAULT ROLE when user account
#             is not granted the role
#
CREATE USER a;
CREATE USER b;
CREATE ROLE r1;
CREATE ROLE r2;
SET DEFAULT ROLE r1 FOR a;
ERROR OP000: User `a`@`%` has not been granted role `r1`
GRANT r1 TO b;
GRANT r2 TO b;
SET DEFAULT ROLE r1 FOR b;
# Change user b
SELECT CURRENT_ROLE;
CURRENT_ROLE
r1
SET ROLE r2;
SELECT CURRENT_ROLE;
CURRENT_ROLE
r2
SET DEFAULT ROLE r1 FOR a;
ERROR 42000: Access denied for user 'b'@'%' to database 'mysql'
SET DEFAULT ROLE r2;
# Change user root (session 1: select_priv to b)
GRANT SELECT ON mysql.* TO b;
# Change user b (session 1: select_priv)
SHOW GRANTS FOR b;
Grants for b@%
GRANT `r1` TO `b`@`%`
GRANT `r2` TO `b`@`%`
GRANT USAGE ON *.* TO `b`@`%`
GRANT SELECT ON `mysql`.* TO `b`@`%`
SET DEFAULT ROLE `r2` FOR `b`@`%`
SET DEFAULT ROLE r1 FOR a;
ERROR 42000: Access denied for user 'b'@'%' to database 'mysql'
SELECT CURRENT_ROLE;
CURRENT_ROLE
r2
SET DEFAULT ROLE NONE;
SELECT CURRENT_ROLE;
CURRENT_ROLE
r2
SET DEFAULT ROLE current_role FOR current_user;
SET DEFAULT ROLE invalid_role;
ERROR OP000: Invalid role specification `invalid_role`
SET DEFAULT ROLE invalid_role FOR a;
ERROR 42000: Access denied for user 'b'@'%' to database 'mysql'
SET DEFAULT ROLE none FOR a;
ERROR 42000: Access denied for user 'b'@'%' to database 'mysql'
# Change user root (session 2: adding update_priv to user b)
GRANT UPDATE ON mysql.* TO b;
# Change user b
SHOW GRANTS FOR b;
Grants for b@%
GRANT `r1` TO `b`@`%`
GRANT `r2` TO `b`@`%`
GRANT USAGE ON *.* TO `b`@`%`
GRANT SELECT, UPDATE ON `mysql`.* TO `b`@`%`
SET DEFAULT ROLE `r2` FOR `b`@`%`
SET DEFAULT ROLE r1 FOR a;
ERROR OP000: User `a`@`%` has not been granted role `r1`
SET DEFAULT ROLE invalid_role;
ERROR OP000: Invalid role specification `invalid_role`
SET DEFAULT ROLE invalid_role FOR a;
ERROR OP000: Invalid role specification `invalid_role`
SET DEFAULT ROLE none FOR a;
# Change user root (session 3: Grant role to user a)
GRANT r1 TO a;
SET DEFAULT ROLE r1 FOR a;
# Change user a (verify session 3)
SELECT CURRENT_ROLE;
CURRENT_ROLE
r1
SET DEFAULT ROLE None;
# Change user b (session 3: role granted to user a)
SET DEFAULT ROLE r1 FOR a;
SET DEFAULT ROLE r2 FOR a;
ERROR OP000: User `a`@`%` has not been granted role `r2`
SET DEFAULT ROLE invalid_role;
ERROR OP000: Invalid role specification `invalid_role`
SET DEFAULT ROLE invalid_role FOR a;
ERROR OP000: Invalid role specification `invalid_role`
SELECT user, host, default_role FROM mysql.user where user='a' or user='b';
User	Host	default_role
a	%	r1
b	%	r2
DROP ROLE r1, r2;
DROP USER a, b;