Rim/iw4x-client
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rcon with rsa cryptography

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This commit is contained in:
Diavolo 2023-08-28 19:50:19 +02:00
parent 395e531d8d
commit b55ff8675e
No known key found for this signature in database
GPG Key ID: FA77F074E98D98A5
4 changed files with 280 additions and 59 deletions
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3
scripts/convert_private_key.bat Normal file
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@ -0,0 +1,3 @@
@echo off
echo Exporting DER rsa-private.key to PEM...
openssl rsa -in rsa-private.key -inform DER -outform PEM -out exported-rsa-private.key

4
scripts/convert_private_key.sh Normal file
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@ -0,0 +1,4 @@
#!/bin/bash
echo "Exporting DER rsa-private.key to PEM..."
openssl rsa -in rsa-private.key -inform DER -outform PEM -out exported-rsa-private.key

282
src/Components/Modules/RCon.cpp
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@ -9,16 +9,18 @@ namespace Components
{
std::unordered_map<std::uint32_t, int> RCon::RateLimit;
std::vector<std::size_t> RCon::RconAddresses;
std::vector<std::size_t> RCon::RConAddresses;
RCon::Container RCon::RconContainer;
Utils::Cryptography::ECC::Key RCon::RconKey;
RCon::Container RCon::RConContainer;
Utils::Cryptography::ECC::Key RCon::RConKey;
std::string RCon::Password;
Dvar::Var RCon::RconPassword;
Dvar::Var RCon::RconLogRequests;
Dvar::Var RCon::RconTimeout;
Dvar::Var RCon::RConPassword;
Dvar::Var RCon::RConLogRequests;
Dvar::Var RCon::RConTimeout;
std::string RCon::RConOutputBuffer;
void RCon::AddCommands()
{
@ -61,11 +63,44 @@ namespace Components
Logger::Print("You are connected to an invalid server\n");
});
Command::Add("rconSafe", [](const Command::Params* params)
{
if (params->size() < 2)
{
Logger::Print("Usage: {} <command>\n", params->get(0));
return;
}
const auto command = params->join(1);
auto* addr = reinterpret_cast<Game::netadr_t*>(0xA5EA44);
Network::Address target(addr);
if (!target.isValid() || target.getIP().full == 0)
{
target = Party::Target();
}
if (!target.isValid())
{
Logger::Print("You are connected to an invalid server\n");
return;
}
const auto& key = CryptoKeyRSA::GetPrivateKey();
const auto signature = Utils::Cryptography::RSA::SignMessage(key, command);
Proto::RCon::Command directive;
directive.set_command(command);
directive.set_signature(signature);
Network::SendCommand(target, "rconSafe", directive.SerializeAsString());
});
Command::Add("remoteCommand", [](const Command::Params* params)
{
if (params->size() < 2) return;
RconContainer.command = params->get(1);
RConContainer.command = params->get(1);
auto* addr = reinterpret_cast<Game::netadr_t*>(0xA5EA44);
Network::Address target(addr);
@ -91,9 +126,9 @@ namespace Components
Network::Address address(params->get(1));
const auto hash = std::hash<std::uint32_t>()(*reinterpret_cast<const std::uint32_t*>(&address.getIP().bytes[0]));
if (address.isValid() && std::ranges::find(RconAddresses, hash) == RconAddresses.end())
if (address.isValid() && std::ranges::find(RConAddresses, hash) == RConAddresses.end())
{
RconAddresses.push_back(hash);
RConAddresses.push_back(hash);
}
});
}
@ -113,7 +148,7 @@ namespace Components
const auto ip = address.getIP();
const auto lastTime = RateLimit[ip.full];
if (lastTime && (time - lastTime) < RconTimeout.get<int>())
if (lastTime && (time - lastTime) < RConTimeout.get<int>())
{
return false; // Flooding
}
@ -127,7 +162,7 @@ namespace Components
for (auto i = RateLimit.begin(); i != RateLimit.end();)
{
// No longer at risk of flooding, remove
if ((time - i->second) > RconTimeout.get<int>())
if ((time - i->second) > RConTimeout.get<int>())
{
i = RateLimit.erase(i);
}
@ -138,7 +173,7 @@ namespace Components
}
}
void RCon::RconExecuter(const Network::Address& address, std::string data)
void RCon::RConExecutor(const Network::Address& address, std::string data)
{
Utils::String::Trim(data);
@ -159,7 +194,7 @@ namespace Components
password.erase(password.begin());
}
const auto svPassword = RconPassword.get<std::string>();
const auto svPassword = RConPassword.get<std::string>();
if (svPassword.empty())
{
Logger::Print(Game::CON_CHANNEL_NETWORK, "RCon request from {} dropped. No password set!\n", address.getString());
@ -172,8 +207,7 @@ namespace Components
return;
}
static std::string outputBuffer;
outputBuffer.clear();
RConOutputBuffer.clear();
#ifndef _DEBUG
if (RconLogRequests.get<bool>())
@ -184,15 +218,39 @@ namespace Components
Logger::PipeOutput([](const std::string& output)
{
outputBuffer.append(output);
RConOutputBuffer.append(output);
});
Command::Execute(command, true);
Logger::PipeOutput(nullptr);
Network::SendCommand(address, "print", outputBuffer);
outputBuffer.clear();
Network::SendCommand(address, "print", RConOutputBuffer);
RConOutputBuffer.clear();
}
void RCon::RConSafeExecutor(const Network::Address& address, std::string command)
{
RConOutputBuffer.clear();
#ifndef _DEBUG
if (RConLogRequests.get<bool>())
#endif
{
Logger::Print(Game::CON_CHANNEL_NETWORK, "Executing Safe RCon request from {}: {}\n", address.getString(), command);
}
Logger::PipeOutput([](const std::string& output)
{
RConOutputBuffer.append(output);
});
Command::Execute(command, true);
Logger::PipeOutput(nullptr);
Network::SendCommand(address, "print", RConOutputBuffer);
RConOutputBuffer.clear();
}
RCon::RCon()
@ -203,16 +261,16 @@ namespace Components
{
Network::OnClientPacket("rconAuthorization", [](const Network::Address& address, [[maybe_unused]] const std::string& data)
{
if (RconContainer.command.empty())
if (RConContainer.command.empty())
{
return;
}
const auto& key = CryptoKey::Get();
const auto& key = CryptoKeyECC::Get();
const auto signedMsg = Utils::Cryptography::ECC::SignMessage(key, data);
Proto::RCon::Command rconExec;
rconExec.set_command(RconContainer.command);
rconExec.set_command(RConContainer.command);
rconExec.set_signature(signedMsg);
Network::SendCommand(address, "rconExecute", rconExec.SerializeAsString());
@ -238,21 +296,21 @@ namespace Components
0x08
};
RconKey.set(std::string(reinterpret_cast<char*>(publicKey), sizeof(publicKey)));
RConKey.set(std::string(reinterpret_cast<char*>(publicKey), sizeof(publicKey)));
RconContainer.timestamp = 0;
RConContainer.timestamp = 0;
Events::OnDvarInit([]
{
RconPassword = Dvar::Register<const char*>("rcon_password", "", Game::DVAR_NONE, "The password for rcon");
RconLogRequests = Dvar::Register<bool>("rcon_log_requests", false, Game::DVAR_NONE, "Print remote commands in log");
RconTimeout = Dvar::Register<int>("rcon_timeout", 500, 100, 10000, Game::DVAR_NONE, "");
RConPassword = Dvar::Register<const char*>("rcon_password", "", Game::DVAR_NONE, "The password for rcon");
RConLogRequests = Dvar::Register<bool>("rcon_log_requests", false, Game::DVAR_NONE, "Print remote commands in log");
RConTimeout = Dvar::Register<int>("rcon_timeout", 500, 100, 10000, Game::DVAR_NONE, "");
});
Network::OnClientPacket("rcon", [](const Network::Address& address, [[maybe_unused]] const std::string& data)
{
const auto hash = std::hash<std::uint32_t>()(*reinterpret_cast<const std::uint32_t*>(&address.getIP().bytes[0]));
if (!RconAddresses.empty() && std::ranges::find(RconAddresses, hash) == RconAddresses.end())
if (!RConAddresses.empty() && std::ranges::find(RConAddresses, hash) == RConAddresses.end())
{
return;
}
@ -268,50 +326,97 @@ namespace Components
auto rconData = data;
Scheduler::Once([address, s = std::move(rconData)]
{
RconExecuter(address, s);
RConExecutor(address, s);
}, Scheduler::Pipeline::MAIN);
});
Network::OnClientPacket("rconSafe", [](const Network::Address& address, [[maybe_unused]] const std::string& data) -> void
{
const auto hash = std::hash<std::uint32_t>()(*reinterpret_cast<const std::uint32_t*>(&address.getIP().bytes[0]));
if (!RConAddresses.empty() && std::ranges::find(RConAddresses, hash) == RConAddresses.end())
{
return;
}
const auto time = Game::Sys_Milliseconds();
if (!IsRateLimitCheckDisabled() && !RateLimitCheck(address, time))
{
return;
}
RateLimitCleanup(time);
if (!CryptoKeyRSA::HasPublicKey())
{
return;
}
auto& key = CryptoKeyRSA::GetPublicKey();
if (!key.isValid())
{
Logger::PrintError(Game::CON_CHANNEL_NETWORK, "RSA public key is invalid\n");
}
Proto::RCon::Command directive;
if (!directive.ParseFromString(data))
{
Logger::PrintError(Game::CON_CHANNEL_NETWORK, "Unable to parse secure command from {}\n", address.getString());
return;
}
if (!Utils::Cryptography::RSA::VerifyMessage(key, directive.command(), directive.signature()))
{
Logger::PrintError(Game::CON_CHANNEL_NETWORK, "RSA signature verification failed for message from {}\n", address.getString());
return;
}
std::string rconData = directive.command();
Scheduler::Once([address, s = std::move(rconData)]
{
RConSafeExecutor(address, s);
}, Scheduler::Pipeline::MAIN);
});
Network::OnClientPacket("rconRequest", [](const Network::Address& address, [[maybe_unused]] const std::string& data)
{
RconContainer.address = address;
RconContainer.challenge = Utils::Cryptography::Rand::GenerateChallenge();
RconContainer.timestamp = Game::Sys_Milliseconds();
RConContainer.address = address;
RConContainer.challenge = Utils::Cryptography::Rand::GenerateChallenge();
RConContainer.timestamp = Game::Sys_Milliseconds();
Network::SendCommand(address, "rconAuthorization", RconContainer.challenge);
Network::SendCommand(address, "rconAuthorization", RConContainer.challenge);
});
Network::OnClientPacket("rconExecute", [](const Network::Address& address, [[maybe_unused]] const std::string& data)
{
if (address != RconContainer.address) return; // Invalid IP
if (!RconContainer.timestamp || (Game::Sys_Milliseconds() - RconContainer.timestamp) > (1000 * 10)) return; // Timeout
if (address != RConContainer.address) return; // Invalid IP
if (!RConContainer.timestamp || (Game::Sys_Milliseconds() - RConContainer.timestamp) > (1000 * 10)) return; // Timeout
RconContainer.timestamp = 0;
RConContainer.timestamp = 0;
Proto::RCon::Command rconExec;
rconExec.ParseFromString(data);
if (!Utils::Cryptography::ECC::VerifyMessage(RconKey, RconContainer.challenge, rconExec.signature()))
if (!Utils::Cryptography::ECC::VerifyMessage(RConKey, RConContainer.challenge, rconExec.signature()))
{
return;
}
RconContainer.output.clear();
RConContainer.output.clear();
Logger::PipeOutput([](const std::string& output)
{
RconContainer.output.append(output);
RConContainer.output.append(output);
});
Command::Execute(rconExec.command(), true);
Logger::PipeOutput(nullptr);
Network::SendCommand(address, "print", RconContainer.output);
RconContainer.output.clear();
Network::SendCommand(address, "print", RConContainer.output);
RConContainer.output.clear();
});
}
bool RCon::CryptoKey::LoadKey(Utils::Cryptography::ECC::Key& key)
bool RCon::CryptoKeyECC::LoadKey(Utils::Cryptography::ECC::Key& key)
{
std::string data;
if (!Utils::IO::ReadFile("./private.key", &data))
@ -323,7 +428,7 @@ namespace Components
return key.isValid();
}
Utils::Cryptography::ECC::Key RCon::CryptoKey::GenerateKey()
Utils::Cryptography::ECC::Key RCon::CryptoKeyECC::GenerateKey()
{
auto key = Utils::Cryptography::ECC::GenerateKey(512);
if (!key.isValid())
@ -339,7 +444,7 @@ namespace Components
return key;
}
Utils::Cryptography::ECC::Key RCon::CryptoKey::LoadOrGenerateKey()
Utils::Cryptography::ECC::Key RCon::CryptoKeyECC::LoadOrGenerateKey()
{
Utils::Cryptography::ECC::Key key;
if (LoadKey(key))
@ -350,16 +455,103 @@ namespace Components
return GenerateKey();
}
Utils::Cryptography::ECC::Key RCon::CryptoKey::GetKeyInternal()
Utils::Cryptography::ECC::Key RCon::CryptoKeyECC::GetKeyInternal()
{
auto key = LoadOrGenerateKey();
Utils::IO::WriteFile("./public.key", key.getPublicKey());
return key;
}
const Utils::Cryptography::ECC::Key& RCon::CryptoKey::Get()
Utils::Cryptography::ECC::Key& RCon::CryptoKeyECC::Get()
{
static auto key = GetKeyInternal();
return key;
}
Utils::Cryptography::RSA::Key RCon::CryptoKeyRSA::LoadPublicKey()
{
Utils::Cryptography::RSA::Key key;
std::string data;
if (!Utils::IO::ReadFile("./rsa-public.key", &data))
{
return key;
}
key.set(data);
return key;
}
Utils::Cryptography::RSA::Key RCon::CryptoKeyRSA::GetPublicKeyInternal()
{
auto key = LoadPublicKey();
return key;
}
Utils::Cryptography::RSA::Key& RCon::CryptoKeyRSA::GetPublicKey()
{
static auto key = GetPublicKeyInternal();
return key;
}
bool RCon::CryptoKeyRSA::LoadPrivateKey(Utils::Cryptography::RSA::Key& key)
{
std::string data;
if (!Utils::IO::ReadFile("./rsa-private.key", &data))
{
return false;
}
key.set(data);
return key.isValid();
}
Utils::Cryptography::RSA::Key RCon::CryptoKeyRSA::GenerateKeyPair()
{
auto key = Utils::Cryptography::RSA::GenerateKey(4096);
if (!key.isValid())
{
throw std::runtime_error("Failed to generate RSA key!");
}
if (!Utils::IO::WriteFile("./rsa-private.key", key.serialize(PK_PRIVATE)))
{
throw std::runtime_error("Failed to write RSA private key!");
}
if (!Utils::IO::WriteFile("./rsa-public.key", key.serialize(PK_PUBLIC)))
{
throw std::runtime_error("Failed to write RSA public key!");
}
return key;
}
Utils::Cryptography::RSA::Key RCon::CryptoKeyRSA::LoadOrGeneratePrivateKey()
{
Utils::Cryptography::RSA::Key key;
if (LoadPrivateKey(key))
{
return key;
}
return GenerateKeyPair();
}
Utils::Cryptography::RSA::Key RCon::CryptoKeyRSA::GetPrivateKeyInternal()
{
auto key = LoadOrGeneratePrivateKey();
return key;
}
Utils::Cryptography::RSA::Key& RCon::CryptoKeyRSA::GetPrivateKey()
{
static auto key = GetPrivateKeyInternal();
return key;
}
bool RCon::CryptoKeyRSA::HasPublicKey()
{
return Utils::IO::FileExists("./rsa-public.key");
}
}

50
src/Components/Modules/RCon.hpp
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@ -11,17 +11,17 @@ namespace Components
class Container
{
public:
int timestamp;
std::string output;
std::string command;
std::string challenge;
Network::Address address;
int timestamp{};
std::string output{};
std::string command{};
std::string challenge{};
Network::Address address{};
};
class CryptoKey
class CryptoKeyECC
{
public:
static const Utils::Cryptography::ECC::Key& Get();
static Utils::Cryptography::ECC::Key& Get();
private:
static bool LoadKey(Utils::Cryptography::ECC::Key& key);
static Utils::Cryptography::ECC::Key GenerateKey();
@ -29,18 +29,39 @@ namespace Components
static Utils::Cryptography::ECC::Key GetKeyInternal();
};
class CryptoKeyRSA
{
public:
static bool HasPublicKey();
static Utils::Cryptography::RSA::Key& GetPublicKey();
static Utils::Cryptography::RSA::Key& GetPrivateKey();
private:
static Utils::Cryptography::RSA::Key GenerateKeyPair();
static Utils::Cryptography::RSA::Key LoadPublicKey();
static Utils::Cryptography::RSA::Key GetPublicKeyInternal();
static bool LoadPrivateKey(Utils::Cryptography::RSA::Key& key);
static Utils::Cryptography::RSA::Key LoadOrGeneratePrivateKey();
static Utils::Cryptography::RSA::Key GetPrivateKeyInternal();
};
static std::unordered_map<std::uint32_t, int> RateLimit;
static std::vector<std::size_t> RconAddresses;
static std::vector<std::size_t> RConAddresses;
static Container RconContainer;
static Utils::Cryptography::ECC::Key RconKey;
static Container RConContainer;
static Utils::Cryptography::ECC::Key RConKey;
static std::string Password;
static Dvar::Var RconPassword;
static Dvar::Var RconLogRequests;
static Dvar::Var RconTimeout;
static std::string RConOutputBuffer;
static Dvar::Var RConPassword;
static Dvar::Var RConLogRequests;
static Dvar::Var RConTimeout;
static void AddCommands();
@ -48,6 +69,7 @@ namespace Components
static bool RateLimitCheck(const Network::Address& address, int time);
static void RateLimitCleanup(int time);
static void RconExecuter(const Network::Address& address, std::string data);
static void RConExecutor(const Network::Address& address, std::string data);
static void RConSafeExecutor(const Network::Address& address, std::string command);
};
}