I2P: End-to-End encrypted and anonymous Internet https://i2pd.website/
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#ifndef NTCP2_H__
#define NTCP2_H__
#include <inttypes.h>
#include <memory>
#include <thread>
#include <list>
#include <map>
#include <openssl/bn.h>
#include <boost/asio.hpp>
#include "RouterInfo.h"
#include "TransportSession.h"
namespace i2p
{
namespace transport
{
const size_t NTCP2_UNENCRYPTED_FRAME_MAX_SIZE = 65519;
const int NTCP2_MAX_PADDING_RATIO = 6; // in %
enum NTCP2BlockType
{
eNTCP2BlkDateTime = 0,
eNTCP2BlkOptions, // 1
eNTCP2BlkRouterInfo, // 2
eNTCP2BlkI2NPMessage, // 3
eNTCP2BlkTermination, // 4
eNTCP2BlkPadding = 254
};
struct NTCP2Establisher
{
NTCP2Establisher ();
~NTCP2Establisher ();
const uint8_t * GetPub () const { return m_EphemeralPublicKey; };
const uint8_t * GetPriv () const { return m_EphemeralPrivateKey; };
const uint8_t * GetRemotePub () const { return m_RemoteEphemeralPublicKey; }; // Y for Alice and X for Bob
uint8_t * GetRemotePub () { return m_RemoteEphemeralPublicKey; }; // to set
const uint8_t * GetK () const { return m_K; };
const uint8_t * GetCK () const { return m_CK; };
const uint8_t * GetH () const { return m_H; };
void KDF1Alice ();
void KDF1Bob ();
void MixKey (const uint8_t * inputKeyMaterial, uint8_t * derived);
void KeyDerivationFunction1 (const uint8_t * rs, const uint8_t * priv, const uint8_t * pub); // for SessionRequest
void KeyDerivationFunction2 (const uint8_t * sessionRequest, size_t sessionRequestLen); // for SessionCreate
void KDF3Alice (); // for SessionConfirmed part 2
void KDF3Bob ();
void CreateEphemeralKey ();
BN_CTX * m_Ctx;
uint8_t m_EphemeralPrivateKey[32], m_EphemeralPublicKey[32], m_RemoteEphemeralPublicKey[32]; // x25519
uint8_t m_RemoteStaticKey[32], m_IV[16], m_H[32] /*h*/, m_CK[33] /*ck*/, m_K[32] /*k*/;
uint16_t m3p2Len;
};
class NTCP2Server;
class NTCP2Session: public TransportSession, public std::enable_shared_from_this<NTCP2Session>
{
public:
NTCP2Session (NTCP2Server& server, std::shared_ptr<const i2p::data::RouterInfo> in_RemoteRouter = nullptr);
~NTCP2Session ();
void Terminate ();
void Done ();
boost::asio::ip::tcp::socket& GetSocket () { return m_Socket; };
bool IsEstablished () const { return m_IsEstablished; };
bool IsTerminated () const { return m_IsTerminated; };
void ClientLogin (); // Alice
void ServerLogin (); // Bob
void SendI2NPMessages (const std::vector<std::shared_ptr<I2NPMessage> >& msgs);
private:
void Established ();
void CreateNonce (uint64_t seqn, uint8_t * nonce);
void KeyDerivationFunctionDataPhase ();
// establish
void SendSessionRequest ();
void SendSessionCreated ();
void SendSessionConfirmed ();
void HandleSessionRequestSent (const boost::system::error_code& ecode, std::size_t bytes_transferred);
void HandleSessionRequestReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred);
void HandleSessionRequestPaddingReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred);
void HandleSessionCreatedSent (const boost::system::error_code& ecode, std::size_t bytes_transferred);
void HandleSessionCreatedReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred);
void HandleSessionCreatedPaddingReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred);
void HandleSessionConfirmedSent (const boost::system::error_code& ecode, std::size_t bytes_transferred);
void HandleSessionConfirmedReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred);
// data
void ReceiveLength ();
void HandleReceivedLength (const boost::system::error_code& ecode, std::size_t bytes_transferred);
void Receive ();
void HandleReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred);
void ProcessNextFrame (const uint8_t * frame, size_t len);
void SendNextFrame (const uint8_t * payload, size_t len);
void HandleNextFrameSent (const boost::system::error_code& ecode, std::size_t bytes_transferred);
void SendQueue ();
private:
NTCP2Server& m_Server;
boost::asio::ip::tcp::socket m_Socket;
bool m_IsEstablished, m_IsTerminated;
std::unique_ptr<NTCP2Establisher> m_Establisher;
uint8_t * m_SessionRequestBuffer, * m_SessionCreatedBuffer, * m_SessionConfirmedBuffer;
size_t m_SessionRequestBufferLen, m_SessionCreatedBufferLen;
// data phase
uint8_t m_Kab[33], m_Kba[32], m_Sipkeysab[33], m_Sipkeysba[32];
const uint8_t * m_SendKey, * m_ReceiveKey, * m_SendSipKey, * m_ReceiveSipKey;
uint16_t m_NextReceivedLen;
uint8_t * m_NextReceivedBuffer, * m_NextSendBuffer;
uint8_t m_ReceiveIV[8], m_SendIV[8];
uint64_t m_ReceiveSequenceNumber, m_SendSequenceNumber;
i2p::I2NPMessagesHandler m_Handler;
bool m_IsSending;
std::list<std::shared_ptr<I2NPMessage> > m_SendQueue;
};
class NTCP2Server
{
public:
NTCP2Server ();
~NTCP2Server ();
void Start ();
void Stop ();
bool AddNTCP2Session (std::shared_ptr<NTCP2Session> session);
void RemoveNTCP2Session (std::shared_ptr<NTCP2Session> session);
std::shared_ptr<NTCP2Session> FindNTCP2Session (const i2p::data::IdentHash& ident);
boost::asio::io_service& GetService () { return m_Service; };
void Connect(const boost::asio::ip::address & address, uint16_t port, std::shared_ptr<NTCP2Session> conn);
private:
void Run ();
void HandleConnect (const boost::system::error_code& ecode, std::shared_ptr<NTCP2Session> conn);
private:
bool m_IsRunning;
std::thread * m_Thread;
boost::asio::io_service m_Service;
boost::asio::io_service::work m_Work;
std::map<i2p::data::IdentHash, std::shared_ptr<NTCP2Session> > m_NTCP2Sessions;
public:
// for HTTP/I2PControl
const decltype(m_NTCP2Sessions)& GetNTCP2Sessions () const { return m_NTCP2Sessions; };
};
}
}
#endif