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Harden malformed vehicle packet parsing

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This commit is contained in:
alex
2026-03-07 21:23:00 -07:00
parent 3befc84f00
commit 48d721f602
2 changed files with 38 additions and 3 deletions
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8
src/TNetwork.cpp
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@@ -670,7 +670,13 @@ void TNetwork::TCPClient(const std::weak_ptr<TClient>& c) {
Client->Disconnect("TCPRcv failed");
break;
}
mServer.GlobalParser(c, std::move(res), mPPSMonitor, *this, false);
try {
mServer.GlobalParser(c, std::move(res), mPPSMonitor, *this, false);
} catch (const std::exception& e) {
beammp_warnf("Failed to receive/parse packet via TCP from client {}: {}", Client->GetID(), e.what());
Client->Disconnect("Failed to parse packet");
break;
}
}
if (QueueSync.joinable())

33
src/TServer.cpp
View File

@@ -28,6 +28,7 @@
#include <any>
#include <optional>
#include <sstream>
#include <utility>
#include <nlohmann/json.hpp>
@@ -54,6 +55,15 @@ static std::optional<std::pair<int, int>> GetPidVid(const std::string& str) {
return std::nullopt;
}
static std::optional<std::string> ExtractStructuredPayload(const std::string& PacketData, char BeginMarker) {
auto FoundPos = PacketData.find(BeginMarker);
if (FoundPos == std::string::npos) {
return std::nullopt;
}
return PacketData.substr(FoundPos);
}
TEST_CASE("GetPidVid") {
SUBCASE("Valid singledigit") {
const auto MaybePidVid = GetPidVid("0-1");
@@ -121,6 +131,13 @@ TEST_CASE("GetPidVid") {
}
}
TEST_CASE("ExtractStructuredPayload") {
CHECK_EQ(ExtractStructuredPayload("1-2:{\"reset\":true}", '{').value(), "{\"reset\":true}");
CHECK_EQ(ExtractStructuredPayload("1-2:[0,1,2,3]", '[').value(), "[0,1,2,3]");
CHECK_FALSE(ExtractStructuredPayload("1-2:null", '{').has_value());
CHECK_FALSE(ExtractStructuredPayload("1-2:null", '[').has_value());
}
TServer::TServer(const std::vector<std::string_view>& Arguments) {
beammp_info("BeamMP Server v" + Application::ServerVersionString());
Application::SetSubsystemStatus("Server", Application::Status::Starting);
@@ -472,7 +489,13 @@ void TServer::ParseVehicle(TClient& c, const std::string& Pckt, TNetwork& Networ
}
if (PID != -1 && VID != -1 && PID == c.GetID()) {
Data = Data.substr(Data.find('{'));
auto ResetData = ExtractStructuredPayload(Data, '{');
if (!ResetData.has_value()) {
beammp_warnf("Malformed 'Or' packet from client {}: missing '{{' in '{}'", c.GetID(), Packet);
return;
}
Data = std::move(ResetData.value());
LuaAPI::MP::Engine->ReportErrors(LuaAPI::MP::Engine->TriggerEvent("onVehicleReset", "", c.GetID(), VID, Data));
Network.SendToAll(&c, StringToVector(Packet), false, true);
}
@@ -501,7 +524,13 @@ void TServer::ParseVehicle(TClient& c, const std::string& Pckt, TNetwork& Networ
}
if (PID != -1 && VID != -1 && PID == c.GetID()) {
Data = Data.substr(Data.find('['));
auto PaintData = ExtractStructuredPayload(Data, '[');
if (!PaintData.has_value()) {
beammp_warnf("Malformed 'Op' packet from client {}: missing '[' in '{}'", c.GetID(), Packet);
return;
}
Data = std::move(PaintData.value());
LuaAPI::MP::Engine->ReportErrors(LuaAPI::MP::Engine->TriggerEvent("onVehiclePaintChanged", "", c.GetID(), VID, Data));
Network.SendToAll(&c, StringToVector(Packet), false, true);