Core/Auth: Per SRP6a protocol, terminate connection of A % N == 0. This resolves another authentication bypass issue

data/sql/updates/db_auth/2016_11_19_00.sql

@@ -13,7 +13,7 @@ INSERT INTO version_db_auth (`sql_rev`) VALUES ('1478975214169487000');
 
 ALTER TABLE `account`
     ADD `token_key` VARCHAR(100) NOT NULL DEFAULT '' AFTER `s`,
-    ADD `reg_mail` VARCHAR(255) NOT NULL DEFAULT '' AFTER `mail`,
+    ADD `reg_mail` VARCHAR(255) NOT NULL DEFAULT '' AFTER `email`,
     ADD `last_attempt_ip` VARCHAR(15) NOT NULL DEFAULT '127.0.0.1' AFTER `last_ip`,
     ADD `lock_country` VARCHAR(2) NOT NULL DEFAULT '00' AFTER `locked`;
 --

data/sql/updates/db_world/2016_11_19_00.sql

@@ -11,7 +11,7 @@ SELECT sql_rev INTO OK FROM version_db_world WHERE sql_rev = '147723682367413000
 --
 INSERT INTO version_db_world(`sql_rev`) VALUES ('1477236823674130000');
 
-UPDATE `quest_template` SET `SpecialFlags` = "0", `RequiredItemId1` = "31811", `RequiredItemCount1` ="1", `Flags` = "0" WHERE `ID` = "10923"
+UPDATE `quest_template` SET `SpecialFlags` = "0", `RequiredItemId1` = "31811", `RequiredItemCount1` ="1", `Flags` = "0" WHERE `ID` = "10923";
 --
 -- END UPDATING QUERIES
 --

src/authserver/Server/AuthSocket.cpp

@@ -557,7 +557,7 @@ bool AuthSocket::_HandleLogonProof()
     A.SetBinary(lp.A, 32);
 
     // SRP safeguard: abort if A == 0
-    if (A.isZero())
+    if ((A % N).isZero())
     {
         socket().shutdown();
         return true;