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Merge pull request #189 from OogwayUniverse/fdb_checksum

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Implement FDB Checksum
Checks the client database with a checksum. This is an optional check to prevent the use of modded or outdated clients.
This commit is contained in:
Wincent Holm 2021-12-16 23:54:08 +01:00 committed by GitHub
commit f816ce4beb
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 71 additions and 0 deletions
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68
dWorldServer/WorldServer.cpp
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@ -89,6 +89,7 @@ struct tempSessionInfo {
std::map<std::string, tempSessionInfo> m_PendingUsers;
int instanceID = 0;
int g_CloneID = 0;
std::string databaseChecksum = "";
int main(int argc, char** argv) {
Diagnostics::SetProcessName("World");
@ -235,6 +236,47 @@ int main(int argc, char** argv) {
Game::physicsWorld = &dpWorld::Instance(); //just in case some old code references it
dZoneManager::Instance()->Initialize(LWOZONEID(zoneID, instanceID, cloneID));
g_CloneID = cloneID;
// pre calculate the FDB checksum
if (Game::config->GetValue("check_fdb") == "1") {
std::ifstream fileStream;
static const std::vector<std::string> aliases = {
"res/CDServers.fdb",
"res/cdserver.fdb",
"res/CDClient.fdb",
"res/cdclient.fdb",
};
for (const auto& file : aliases) {
fileStream.open(file, std::ios::binary | std::ios::in);
if (fileStream.is_open()) {
break;
}
}
const int bufferSize = 1024;
MD5* md5 = new MD5();
char fileStreamBuffer[1024] = {};
while (!fileStream.eof()) {
memset(fileStreamBuffer, 0, bufferSize);
fileStream.read(fileStreamBuffer, bufferSize);
md5->update(fileStreamBuffer, fileStream.gcount());
}
fileStream.close();
const char* nullTerminateBuffer = "\0";
md5->update(nullTerminateBuffer, 1); // null terminate the data
md5->finalize();
databaseChecksum = md5->hexdigest();
delete md5;
Game::logger->Log("WorldServer", "FDB Checksum calculated as: %s\n", databaseChecksum.c_str());
}
}
while (true) {
@ -841,7 +883,33 @@ void HandlePacket(Packet* packet) {
case MSG_WORLD_CLIENT_VALIDATION: {
std::string username = PacketUtils::ReadString(0x08, packet, true);
std::string sessionKey = PacketUtils::ReadString(74, packet, true);
std::string clientDatabaseChecksum = PacketUtils::ReadString(packet->length - 33, packet, false);
// sometimes client puts a null terminator at the end of the checksum and sometimes doesn't, weird
clientDatabaseChecksum = clientDatabaseChecksum.substr(0, 32);
// If the check is turned on, validate the client's database checksum.
if (Game::config->GetValue("check_fdb") == "1" && !databaseChecksum.empty()) {
uint32_t gmLevel = 0;
auto* stmt = Database::CreatePreppedStmt("SELECT gm_level FROM accounts WHERE name=? LIMIT 1;");
stmt->setString(1, username.c_str());
auto* res = stmt->executeQuery();
while (res->next()) {
gmLevel = res->getInt(1);
}
delete stmt;
delete res;
// Developers may skip this check
if (gmLevel < 8 && clientDatabaseChecksum != databaseChecksum) {
Game::logger->Log("WorldServer", "Client's database checksum does not match the server's, aborting connection.\n");
Game::server->Disconnect(packet->systemAddress, SERVER_DISCON_KICK);
return;
}
}
//Request the session info from Master:
CBITSTREAM;
PacketUtils::WriteHeader(bitStream, MASTER, MSG_MASTER_REQUEST_SESSION_KEY);

3
resources/worldconfig.ini
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@ -50,3 +50,6 @@ solo_racing=0
# Disables the anti-speedhack system. If you get kicked randomly you might want to disable this, as it might just be lag
disable_anti_speedhack=0
# 0 or 1, check server fdb (res/CDServer.fdb) against clients
check_fdb=0