Fix a login exploit.

Make a list of GUIDs that purpose is which characters can login per account.
This fixes an exploit that player can login (but shouldn't) with packet manipulation.

Signed-off-by: Anubisss <[email protected]>

src/server/game/Server/Protocol/Handlers/CharacterHandler.cpp

@@ -212,8 +212,11 @@ void WorldSession::HandleCharEnum(QueryResult result)
             uint32 guidlow = (*result)[0].GetUInt32();
             sLog->outDetail("Loading char guid %u from account %u.",guidlow,GetAccountId());
             if (Player::BuildEnumData(result, &data))
+            {
+                m_AllowedCharsToLogin.push_back(guidlow);
                 ++num;
             }
+        }
         while (result->NextRow());
     }
 
@@ -660,6 +663,13 @@ void WorldSession::HandlePlayerLoginOpcode(WorldPacket & recv_data)
 
     recv_data >> playerGuid;
 
+    if (!CharCanLogin(GUID_LOPART(playerGuid)))
+    {
+        sLog->outError("Account (%u) can't login with that character (%u).", GetAccountId(), GUID_LOPART(playerGuid));
+        KickPlayer();
+        return;
+    }
+
     LoginQueryHolder *holder = new LoginQueryHolder(GetAccountId(), playerGuid);
     if (!holder->Initialize())
     {

src/server/game/Server/WorldSession.h

@@ -882,6 +882,19 @@ class WorldSession
         void LogUnexpectedOpcode(WorldPacket *packet, const char* status, const char *reason);
         void LogUnprocessedTail(WorldPacket *packet);
 
+        // EnumData helpers
+        bool CharCanLogin(uint32 LowGUID)
+        {
+            if (find(m_AllowedCharsToLogin.begin(),
+                     m_AllowedCharsToLogin.end(),
+                     LowGUID) == m_AllowedCharsToLogin.end())
+                return false;
+            return true;
+        }
+        // this stores the GUIDs of the characters who can login
+        // characters who failed on Player::BuildEnumData shouldn't login
+        std::list<uint32> m_AllowedCharsToLogin;
+
         uint32 m_GUIDLow;                                   // set loggined or recently logout player (while m_playerRecentlyLogout set)
         Player *_player;
         WorldSocket *m_Socket;