mirror of
https://github.com/PurpleI2P/i2pd
synced 2024-11-10 08:00:38 +03:00
260 lines
8.8 KiB
C++
260 lines
8.8 KiB
C++
/*
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* Copyright (c) 2013-2018, The PurpleI2P Project
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*
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* This file is part of Purple i2pd project and licensed under BSD3
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*
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* See full license text in LICENSE file at top of project tree
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*
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* Kovri go write your own code
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*
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*/
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#ifndef NTCP2_H__
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#define NTCP2_H__
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#include <inttypes.h>
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#include <memory>
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#include <thread>
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#include <list>
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#include <map>
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#include <array>
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#include <openssl/bn.h>
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#include <boost/asio.hpp>
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#include "util.h"
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#include "RouterInfo.h"
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#include "TransportSession.h"
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namespace i2p
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{
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namespace transport
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{
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const size_t NTCP2_UNENCRYPTED_FRAME_MAX_SIZE = 65519;
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const int NTCP2_MAX_PADDING_RATIO = 6; // in %
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const int NTCP2_CONNECT_TIMEOUT = 5; // 5 seconds
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const int NTCP2_ESTABLISH_TIMEOUT = 10; // 10 seconds
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const int NTCP2_TERMINATION_TIMEOUT = 120; // 2 minutes
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const int NTCP2_TERMINATION_CHECK_TIMEOUT = 30; // 30 seconds
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const int NTCP2_CLOCK_SKEW = 60; // in seconds
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enum NTCP2BlockType
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{
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eNTCP2BlkDateTime = 0,
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eNTCP2BlkOptions, // 1
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eNTCP2BlkRouterInfo, // 2
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eNTCP2BlkI2NPMessage, // 3
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eNTCP2BlkTermination, // 4
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eNTCP2BlkPadding = 254
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};
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enum NTCP2TerminationReason
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{
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eNTCP2NormalClose = 0,
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eNTCP2TerminationReceived, // 1
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eNTCP2IdleTimeout, // 2
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eNTCP2RouterShutdown, // 3
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eNTCP2DataPhaseAEADFailure, // 4
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eNTCP2IncompatibleOptions, // 5
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eNTCP2IncompatibleSignatureType, // 6
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eNTCP2ClockSkew, // 7
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eNTCP2PaddingViolation, // 8
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eNTCP2AEADFramingError, // 9
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eNTCP2PayloadFormatError, // 10
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eNTCP2Message1Error, // 11
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eNTCP2Message2Error, // 12
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eNTCP2Message3Error, // 13
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eNTCP2IntraFrameReadTimeout, // 14
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eNTCP2RouterInfoSignatureVerificationFail, // 15
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eNTCP2IncorrectSParameter, // 16
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eNTCP2Banned, // 17
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};
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typedef std::array<uint8_t, NTCP2_UNENCRYPTED_FRAME_MAX_SIZE> NTCP2FrameBuffer;
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struct NTCP2Establisher
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{
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NTCP2Establisher ();
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~NTCP2Establisher ();
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const uint8_t * GetPub () const { return m_EphemeralPublicKey; };
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const uint8_t * GetPriv () const { return m_EphemeralPrivateKey; };
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const uint8_t * GetRemotePub () const { return m_RemoteEphemeralPublicKey; }; // Y for Alice and X for Bob
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uint8_t * GetRemotePub () { return m_RemoteEphemeralPublicKey; }; // to set
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const uint8_t * GetK () const { return m_K; };
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const uint8_t * GetCK () const { return m_CK; };
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const uint8_t * GetH () const { return m_H; };
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void KDF1Alice ();
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void KDF1Bob ();
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void KDF2Alice ();
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void KDF2Bob ();
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void KDF3Alice (); // for SessionConfirmed part 2
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void KDF3Bob ();
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void MixKey (const uint8_t * inputKeyMaterial, uint8_t * derived);
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void KeyDerivationFunction1 (const uint8_t * pub, const uint8_t * priv, const uint8_t * rs, const uint8_t * epub); // for SessionRequest, (pub, priv) for DH
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void KeyDerivationFunction2 (const uint8_t * sessionRequest, size_t sessionRequestLen, const uint8_t * epub); // for SessionCreate
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void CreateEphemeralKey ();
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void CreateSessionRequestMessage ();
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void CreateSessionCreatedMessage ();
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void CreateSessionConfirmedMessagePart1 (const uint8_t * nonce);
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void CreateSessionConfirmedMessagePart2 (const uint8_t * nonce);
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bool ProcessSessionRequestMessage (uint16_t& paddingLen);
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bool ProcessSessionCreatedMessage (uint16_t& paddingLen);
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bool ProcessSessionConfirmedMessagePart1 (const uint8_t * nonce);
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bool ProcessSessionConfirmedMessagePart2 (const uint8_t * nonce, uint8_t * m3p2Buf);
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BN_CTX * m_Ctx;
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uint8_t m_EphemeralPrivateKey[32], m_EphemeralPublicKey[32], m_RemoteEphemeralPublicKey[32]; // x25519
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uint8_t m_RemoteStaticKey[32], m_IV[16], m_H[32] /*h*/, m_CK[33] /*ck*/, m_K[32] /*k*/;
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i2p::data::IdentHash m_RemoteIdentHash;
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uint16_t m3p2Len;
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uint8_t * m_SessionRequestBuffer, * m_SessionCreatedBuffer, * m_SessionConfirmedBuffer;
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size_t m_SessionRequestBufferLen, m_SessionCreatedBufferLen;
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};
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class NTCP2Server;
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class NTCP2Session: public TransportSession, public std::enable_shared_from_this<NTCP2Session>
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{
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public:
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NTCP2Session (NTCP2Server& server, std::shared_ptr<const i2p::data::RouterInfo> in_RemoteRouter = nullptr);
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~NTCP2Session ();
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void Terminate ();
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void TerminateByTimeout ();
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void Done ();
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boost::asio::ip::tcp::socket& GetSocket () { return m_Socket; };
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bool IsEstablished () const { return m_IsEstablished; };
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bool IsTerminated () const { return m_IsTerminated; };
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void ClientLogin (); // Alice
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void ServerLogin (); // Bob
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void SendLocalRouterInfo (); // after handshake
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void SendI2NPMessages (const std::vector<std::shared_ptr<I2NPMessage> >& msgs);
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private:
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void Established ();
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void CreateNonce (uint64_t seqn, uint8_t * nonce);
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void KeyDerivationFunctionDataPhase ();
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// establish
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void SendSessionRequest ();
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void SendSessionCreated ();
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void SendSessionConfirmed ();
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void HandleSessionRequestSent (const boost::system::error_code& ecode, std::size_t bytes_transferred);
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void HandleSessionRequestReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred);
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void HandleSessionRequestPaddingReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred);
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void HandleSessionCreatedSent (const boost::system::error_code& ecode, std::size_t bytes_transferred);
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void HandleSessionCreatedReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred);
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void HandleSessionCreatedPaddingReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred);
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void HandleSessionConfirmedSent (const boost::system::error_code& ecode, std::size_t bytes_transferred);
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void HandleSessionConfirmedReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred);
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// data
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void ReceiveLength ();
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void HandleReceivedLength (const boost::system::error_code& ecode, std::size_t bytes_transferred);
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void Receive ();
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void HandleReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred);
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void ProcessNextFrame (const uint8_t * frame, size_t len);
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void SendNextFrame (const uint8_t * payload, size_t len);
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void HandleNextFrameSent (const boost::system::error_code& ecode, std::size_t bytes_transferred);
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void SendQueue ();
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void SendRouterInfo ();
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void SendTermination (NTCP2TerminationReason reason);
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void SendTerminationAndTerminate (NTCP2TerminationReason reason);
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void PostI2NPMessages (std::vector<std::shared_ptr<I2NPMessage> > msgs);
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private:
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NTCP2Server& m_Server;
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boost::asio::ip::tcp::socket m_Socket;
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bool m_IsEstablished, m_IsTerminated;
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std::unique_ptr<NTCP2Establisher> m_Establisher;
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// data phase
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uint8_t m_Kab[33], m_Kba[32], m_Sipkeysab[33], m_Sipkeysba[32];
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const uint8_t * m_SendKey, * m_ReceiveKey, * m_SendSipKey, * m_ReceiveSipKey;
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uint16_t m_NextReceivedLen;
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uint8_t * m_NextReceivedBuffer, * m_NextSendBuffer;
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union
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{
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uint8_t buf[8];
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uint16_t key;
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} m_ReceiveIV, m_SendIV;
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uint64_t m_ReceiveSequenceNumber, m_SendSequenceNumber;
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i2p::I2NPMessagesHandler m_Handler;
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bool m_IsSending;
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std::list<std::shared_ptr<I2NPMessage> > m_SendQueue;
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};
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class NTCP2Server
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{
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public:
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NTCP2Server ();
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~NTCP2Server ();
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void Start ();
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void Stop ();
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bool AddNTCP2Session (std::shared_ptr<NTCP2Session> session);
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void RemoveNTCP2Session (std::shared_ptr<NTCP2Session> session);
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std::shared_ptr<NTCP2Session> FindNTCP2Session (const i2p::data::IdentHash& ident);
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boost::asio::io_service& GetService () { return m_Service; };
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void Connect(const boost::asio::ip::address & address, uint16_t port, std::shared_ptr<NTCP2Session> conn);
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NTCP2FrameBuffer * NewNTCP2FrameBuffer () { return m_NTCP2FrameBuffersPool.Acquire(); }
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void DeleteNTCP2FrameBuffer (NTCP2FrameBuffer * buf) { return m_NTCP2FrameBuffersPool.Release(buf); }
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private:
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void Run ();
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void HandleAccept (std::shared_ptr<NTCP2Session> conn, const boost::system::error_code& error);
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void HandleAcceptV6 (std::shared_ptr<NTCP2Session> conn, const boost::system::error_code& error);
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void HandleConnect (const boost::system::error_code& ecode, std::shared_ptr<NTCP2Session> conn, std::shared_ptr<boost::asio::deadline_timer> timer);
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// timer
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void ScheduleTermination ();
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void HandleTerminationTimer (const boost::system::error_code& ecode);
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private:
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bool m_IsRunning;
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std::thread * m_Thread;
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boost::asio::io_service m_Service;
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boost::asio::io_service::work m_Work;
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boost::asio::deadline_timer m_TerminationTimer;
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std::unique_ptr<boost::asio::ip::tcp::acceptor> m_NTCP2Acceptor, m_NTCP2V6Acceptor;
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std::map<i2p::data::IdentHash, std::shared_ptr<NTCP2Session> > m_NTCP2Sessions;
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std::list<std::shared_ptr<NTCP2Session> > m_PendingIncomingSessions;
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i2p::util::MemoryPool<NTCP2FrameBuffer> m_NTCP2FrameBuffersPool;
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public:
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// for HTTP/I2PControl
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const decltype(m_NTCP2Sessions)& GetNTCP2Sessions () const { return m_NTCP2Sessions; };
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};
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}
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}
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#endif
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