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MDEV-12321 authentication plugin: SET PASSWORD support

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Support SET PASSWORD for authentication plugins.

Authentication plugin API is extended with two optional methods:
* hash_password() is used to compute a password hash (or digest)
  from the plain-text password. This digest will be stored in mysql.user
  table
* preprocess_hash() is used to convert this digest into some memory
  representation that can be later used to authenticate a user.
  Build-in plugins convert the hash from hexadecimal or base64 to binary,
  to avoid doing it on every authentication attempt.

Note a change in behavior: when loading privileges (on startup or on
FLUSH PRIVILEGES) an account with an unknown plugin was loaded with a
warning (e.g. "Plugin 'foo' is not loaded"). But such an account could
not be used for authentication until the plugin is installed. Now an
account like that will not be loaded at all (with a warning, still).
Indeed, without plugin's preprocess_hash() method the server cannot know
how to load an account. Thus, if a new authentication plugin is
installed run-time, one might need FLUSH PRIVILEGES to activate all
existing accounts that were using this new plugin.
This commit is contained in:
Sergei Golubchik 2018-10-17 12:48:13 +02:00
commit 7c40996cc8
37 changed files with 710 additions and 477 deletions
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8
mysql-test/main/failed_auth_3909.test
View file

@ -7,11 +7,11 @@ source include/not_embedded.inc;
# the server requests a plugin
#
optimize table mysql.user;
insert ignore mysql.user (user,plugin) values ('foo','bar'),('bar','bar'),('baz','bar');
insert ignore mysql.user (user,plugin) values ('foo','mysql_old_password'),('bar','mysql_old_password'),('baz','mysql_old_password');
flush privileges;
--replace_result $MASTER_MYSOCK MASTER_SOCKET $MASTER_MYPORT MASTER_PORT
--error ER_PLUGIN_IS_NOT_LOADED
--error ER_SERVER_IS_IN_SECURE_AUTH_MODE
connect (fail,localhost,u1);
--replace_result $MASTER_MYSOCK MASTER_SOCKET $MASTER_MYPORT MASTER_PORT
@ -22,7 +22,7 @@ connect (fail,localhost,u2);
--error ER_ACCESS_DENIED_ERROR
connect (fail,localhost,u2,password);
--error ER_PLUGIN_IS_NOT_LOADED
--error ER_SERVER_IS_IN_SECURE_AUTH_MODE
change_user u1;
--error ER_ACCESS_DENIED_ERROR
@ -31,7 +31,7 @@ change_user u2;
--error ER_ACCESS_DENIED_ERROR
change_user u2,password;
delete from mysql.user where plugin = 'bar';
delete from mysql.user where plugin = 'mysql_old_password';
flush privileges;