MDEV-12321 authentication plugin: SET PASSWORD support

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.

1 files changed, 1 insertions, 1 deletions

diff --git a/sql/share/errmsg-utf8.txt b/sql/share/errmsg-utf8.txt
index a60ddeb3017..e73666cfb58 100644
--- a/sql/share/errmsg-utf8.txt
+++ b/sql/share/errmsg-utf8.txt
@@ -6570,7 +6570,7 @@ ER_ACCESS_DENIED_NO_PASSWORD_ERROR 28000
         ukr "Доступ заборонено для користувача: '%s'@'%s'"
 
 ER_SET_PASSWORD_AUTH_PLUGIN
-        eng "SET PASSWORD has no significance for users authenticating via plugins"
+        eng "SET PASSWORD is ignored for users authenticating via %s plugin"
 
 ER_GRANT_PLUGIN_USER_EXISTS
         eng "GRANT with IDENTIFIED WITH is illegal because the user %-.*s already exists"