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MDEV-22974: mysql_native_password make "invalid" valid

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Per b9f3f06857, mysql_system_tables_data.sql creates
a mysql_native_password with a salted hash of "invalid" so that `set password`
will detect a native password can be applied:.

SHOW CREATE USER; diligently uses this value in its output
generating the SQL:

   MariaDB [(none)]> show create user;

   +---------------------------------------------------------------------------------------------------+
   | CREATE USER for dan@localhost                                                                     |
   +---------------------------------------------------------------------------------------------------+
   | CREATE USER `dan`@`localhost` IDENTIFIED VIA mysql_native_password USING 'invalid' OR unix_socket |
   +---------------------------------------------------------------------------------------------------+

Attempting to execute this before this patch results in:

  MariaDB [(none)]>  CREATE USER `dan2`@`localhost` IDENTIFIED VIA mysql_native_password USING 'invalid' OR unix_socket;
  ERROR 1372 (HY000): Password hash should be a 41-digit hexadecimal number

As such, deep the implementation of mysql_native_password we make "invalid" valid (pun intended)
such that the above create user will succeed. We do this by storing
"*THISISNOTAVALIDPASSWORDTHATCANBEUSEDHERE" (credit: Oracle MySQL), that is of an INCORRECT
length for a scramble.

In native_password_authenticate we check the length of this cached value
and immediately fail if it is anything other than the scramble length.

native_password_get_salt is only called in the context of set_user_salt, so all setting of native
passwords to hashed content of 'invalid', quite literally create an invalid password.

So other forms of "invalid" are valid SQL in creating invalid passwords:

   MariaDB [(none)]> set password = 'invalid';
   Query OK, 0 rows affected (0.001 sec)

   MariaDB [(none)]> alter user dan@localhost IDENTIFIED BY PASSWORD 'invalid';
   Query OK, 0 rows affected (0.000 sec)

closes #1628

Reviewer: serg@mariadb.com
This commit is contained in:
Daniel Black
2020-07-16 16:31:59 +10:00
parent 1fddccf676
commit 5b779c220d
5 changed files with 57 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
mysql-test/main/alter_user.result
View File

@ -61,6 +61,10 @@ alter user foo identified by password '*88C89BE093D4ECF72D039F62EBB7477EA1FD4D63
select * from mysql.user where user = 'foo';
Host User Password Select_priv Insert_priv Update_priv Delete_priv Create_priv Drop_priv Reload_priv Shutdown_priv Process_priv File_priv Grant_priv References_priv Index_priv Alter_priv Show_db_priv Super_priv Create_tmp_table_priv Lock_tables_priv Execute_priv Repl_slave_priv Repl_client_priv Create_view_priv Show_view_priv Create_routine_priv Alter_routine_priv Create_user_priv Event_priv Trigger_priv Create_tablespace_priv Delete_history_priv ssl_type ssl_cipher x509_issuer x509_subject max_questions max_updates max_connections max_user_connections plugin authentication_string password_expired is_role default_role max_statement_time
% foo *88C89BE093D4ECF72D039F62EBB7477EA1FD4D63 N N N N N N N N N N N N N N N Y N N N N N N N N N Y N N N N 0 0 0 0 mysql_native_password *88C89BE093D4ECF72D039F62EBB7477EA1FD4D63 N N 0.000000
alter user foo identified by password 'invalid';
select * from mysql.user where user = 'foo';
Host User Password Select_priv Insert_priv Update_priv Delete_priv Create_priv Drop_priv Reload_priv Shutdown_priv Process_priv File_priv Grant_priv References_priv Index_priv Alter_priv Show_db_priv Super_priv Create_tmp_table_priv Lock_tables_priv Execute_priv Repl_slave_priv Repl_client_priv Create_view_priv Show_view_priv Create_routine_priv Alter_routine_priv Create_user_priv Event_priv Trigger_priv Create_tablespace_priv Delete_history_priv ssl_type ssl_cipher x509_issuer x509_subject max_questions max_updates max_connections max_user_connections plugin authentication_string password_expired is_role default_role max_statement_time
% foo invalid N N N N N N N N N N N N N N N Y N N N N N N N N N Y N N N N 0 0 0 0 mysql_native_password invalid N N 0.000000
alter user foo identified with 'somecoolplugin';
ERROR HY000: Operation ALTER USER failed for 'foo'@'%'
show warnings;