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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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4
mysql-test/main/sp-security.result
View file

@ -711,9 +711,7 @@ disconnect con2;
DROP USER user2@localhost;
DROP DATABASE db1;
create user foo@local_ost;
create user foo@`local\_ost`;
update mysql.user set plugin='foobar' where host='local\\_ost';
flush privileges;
create user foo@`local\_ost` identified via mysql_old_password using '0123456789ABCDEF';
create database foodb;
grant create routine on foodb.* to foo@local_ost;
connect con1,localhost,foo;