Fixed #4191 Updating database user password on MySQL 5.7 leads to "double hash"

How to reproduce issue

Author: Till Brehm

server/plugins-available/mysql_clientdb_plugin.inc.php

@@ -140,7 +140,10 @@ function process_host_list($action, $database_name, $database_user, $database_pa
 			} elseif($action == 'RENAME') {
 				if(!$link->query("RENAME USER '".$link->escape_string($database_user)."'@'$db_host' TO '".$link->escape_string($database_rename_user)."'@'$db_host'")) $success = false;
 			} elseif($action == 'PASSWORD') {
-				if(!$link->query("SET PASSWORD FOR '".$link->escape_string($database_user)."'@'$db_host' = '".$link->escape_string($database_password)."'")) $success = false;
+				//if(!$link->query("SET PASSWORD FOR '".$link->escape_string($database_user)."'@'$db_host' = '".$link->escape_string($database_password)."'")) $success = false;
+				// SET PASSWORD for already hashed passwords is not supported by latest MySQL 5.7 anymore, so we set it directly
+				if(!$link->query("UPDATE mysql.user SET `Password` = '".$link->escape_string($database_password)."' WHERE `Host` = '".$db_host."' AND `User` = '".$link->escape_string($database_user)."'")) $success = false;
+				if($success == true) $link->query("FLUSH PRIVILEGES");
 			}
 		}