[General] Add integrity checks to Handshake packet

apps/openmw-mp/Networking.cpp

@@ -99,6 +99,13 @@ void Networking::processPlayerPacket(RakNet::Packet *packet)
         myPacket->setPlayer(player);
         myPacket->Read();
 
+        if (!myPacket->isPacketValid())
+        {
+            LOG_MESSAGE_SIMPLE(Log::LOG_ERROR, "Invalid handshake packet from %d", player->getId());
+            kickPlayer(player->guid);
+            return;
+        }
+
         if (player->isHandshaked())
         {
             LOG_MESSAGE_SIMPLE(Log::LOG_WARN, "Wrong handshake with player %d, name: %s", player->getId(),

components/openmw-mp/Packets/Player/PacketHandshake.cpp

@@ -16,6 +16,11 @@ PacketHandshake::PacketHandshake(RakNet::RakPeerInterface *peer) : PlayerPacket(
 void PacketHandshake::Packet(RakNet::BitStream *bs, bool send)
 {
     PlayerPacket::Packet(bs, send);
-    RW(player->npc.mName, send);
-    RW(player->passw, send);
+
+    if (!RW(player->npc.mName, send, true, maxNameLen) ||
+        !RW(player->passw, send, true, maxPasswLen))
+    {
+        packetValid = false;
+        return;
+    }
 }

components/openmw-mp/Packets/Player/PacketHandshake.hpp

@@ -15,6 +15,9 @@ namespace mwmp
         PacketHandshake(RakNet::RakPeerInterface *peer);
 
         virtual void Packet(RakNet::BitStream *bs, bool send);
+
+        const static uint32_t maxNameLen = 256;
+        const static uint32_t maxPasswLen = 256;
     };
 }