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243 lines
8.3 KiB
C++
243 lines
8.3 KiB
C++
/*
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* Copyright (c) 2013-2020, 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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#ifndef NTCP_SESSION_H__
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#define NTCP_SESSION_H__
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#include <inttypes.h>
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#include <map>
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#include <memory>
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#include <thread>
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#include <mutex>
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#include <boost/asio.hpp>
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#include "Crypto.h"
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#include "Identity.h"
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#include "RouterInfo.h"
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#include "I2NPProtocol.h"
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#include "TransportSession.h"
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#include "CryptoWorker.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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struct NTCPPhase1
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{
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uint8_t pubKey[256];
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uint8_t HXxorHI[32];
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};
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struct NTCPPhase2
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{
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uint8_t pubKey[256];
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struct
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{
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uint8_t hxy[32];
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uint8_t timestamp[4];
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uint8_t filler[12];
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} encrypted;
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};
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struct NTCPWork;
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const size_t NTCP_MAX_MESSAGE_SIZE = 16384;
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const size_t NTCP_BUFFER_SIZE = 1028; // fits 1 tunnel data message
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const int NTCP_CONNECT_TIMEOUT = 5; // 5 seconds
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const int NTCP_ESTABLISH_TIMEOUT = 10; // 10 seconds
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const int NTCP_TERMINATION_TIMEOUT = 120; // 2 minutes
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const int NTCP_TERMINATION_CHECK_TIMEOUT = 30; // 30 seconds
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const size_t NTCP_DEFAULT_PHASE3_SIZE = 2/*size*/ + i2p::data::DEFAULT_IDENTITY_SIZE/*387*/ + 4/*ts*/ + 15/*padding*/ + 40/*signature*/; // 448
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const int NTCP_CLOCK_SKEW = 60; // in seconds
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const int NTCP_MAX_OUTGOING_QUEUE_SIZE = 200; // how many messages we can queue up
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class NTCPServer;
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class NTCPSession: public TransportSession, public std::enable_shared_from_this<NTCPSession>
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{
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public:
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NTCPSession (NTCPServer& server, std::shared_ptr<const i2p::data::RouterInfo> in_RemoteRouter = nullptr);
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~NTCPSession ();
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void Terminate ();
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void Done ();
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boost::asio::ip::tcp::socket& GetSocket () { return m_Socket; };
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boost::asio::io_service & GetService();
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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 ();
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void ServerLogin ();
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void SendI2NPMessages (const std::vector<std::shared_ptr<I2NPMessage> >& msgs);
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private:
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void PostI2NPMessages (std::vector<std::shared_ptr<I2NPMessage> > msgs);
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void Connected ();
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void SendTimeSyncMessage ();
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void SetIsEstablished (bool isEstablished) { m_IsEstablished = isEstablished; }
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void CreateAESKey (uint8_t * pubKey);
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// client
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void SendPhase3 ();
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void HandlePhase1Sent (const boost::system::error_code& ecode, std::size_t bytes_transferred);
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void HandlePhase2Received (const boost::system::error_code& ecode, std::size_t bytes_transferred);
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void HandlePhase2 (NTCPWork * work=nullptr);
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void HandlePhase3Sent (const boost::system::error_code& ecode, std::size_t bytes_transferred, uint32_t tsA);
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void HandlePhase4Received (const boost::system::error_code& ecode, std::size_t bytes_transferred, uint32_t tsA);
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//server
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void SendPhase2 (NTCPWork * work=nullptr);
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void SendPhase4 (uint32_t tsA, uint32_t tsB);
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void HandlePhase1Received (const boost::system::error_code& ecode, std::size_t bytes_transferred);
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void HandlePhase2Sent (const boost::system::error_code& ecode, std::size_t bytes_transferred, uint32_t tsB);
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void HandlePhase3Received (const boost::system::error_code& ecode, std::size_t bytes_transferred, uint32_t tsB);
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void HandlePhase3ExtraReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred, uint32_t tsB, size_t paddingLen);
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void HandlePhase3 (uint32_t tsB, size_t paddingLen);
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void HandlePhase4Sent (const boost::system::error_code& ecode, std::size_t bytes_transferred);
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// common
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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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bool DecryptNextBlock (const uint8_t * encrypted);
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void Send (std::shared_ptr<i2p::I2NPMessage> msg);
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boost::asio::const_buffers_1 CreateMsgBuffer (std::shared_ptr<I2NPMessage> msg);
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void Send (const std::vector<std::shared_ptr<I2NPMessage> >& msgs);
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void HandleSent (const boost::system::error_code& ecode, std::size_t bytes_transferred, std::vector<std::shared_ptr<I2NPMessage> > msgs);
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private:
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NTCPServer& 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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i2p::crypto::CBCDecryption m_Decryption;
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i2p::crypto::CBCEncryption m_Encryption;
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struct Establisher
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{
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NTCPPhase1 phase1;
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NTCPPhase2 phase2;
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} * m_Establisher;
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i2p::crypto::AESAlignedBuffer<NTCP_BUFFER_SIZE + 16> m_ReceiveBuffer;
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i2p::crypto::AESAlignedBuffer<16> m_TimeSyncBuffer;
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int m_ReceiveBufferOffset;
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std::shared_ptr<I2NPMessage> m_NextMessage;
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size_t m_NextMessageOffset;
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i2p::I2NPMessagesHandler m_Handler;
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bool m_IsSending;
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std::vector<std::shared_ptr<I2NPMessage> > m_SendQueue;
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};
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// TODO: move to NTCP.h/.cpp
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class NTCPServer
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{
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public:
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typedef i2p::worker::ThreadPool<NTCPSession> Pool;
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enum RemoteAddressType
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{
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eIP4Address,
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eIP6Address,
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eHostname
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};
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enum ProxyType
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{
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eNoProxy,
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eSocksProxy,
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eHTTPProxy
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};
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NTCPServer (int workers=4);
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~NTCPServer ();
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void Start ();
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void Stop ();
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bool AddNTCPSession (std::shared_ptr<NTCPSession> session);
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void RemoveNTCPSession (std::shared_ptr<NTCPSession> session);
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std::shared_ptr<NTCPSession> FindNTCPSession (const i2p::data::IdentHash& ident);
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void ConnectWithProxy (const std::string& addr, uint16_t port, RemoteAddressType addrtype, std::shared_ptr<NTCPSession> conn);
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void Connect(const boost::asio::ip::address & address, uint16_t port, std::shared_ptr<NTCPSession> conn);
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bool IsBoundV4() const { return m_NTCPAcceptor != nullptr; };
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bool IsBoundV6() const { return m_NTCPV6Acceptor != nullptr; };
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bool NetworkIsReady() const { return IsBoundV4() || IsBoundV6() || UsingProxy(); };
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bool UsingProxy() const { return m_ProxyType != eNoProxy; };
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void UseProxy(ProxyType proxy, const std::string & address, uint16_t port);
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boost::asio::io_service& GetService () { return m_Service; };
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void SetSessionLimits(uint16_t softLimit, uint16_t hardLimit) { m_SoftLimit = softLimit; m_HardLimit = hardLimit; }
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bool ShouldLimit() const { return ShouldHardLimit() || ShouldSoftLimit(); }
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void Work(std::shared_ptr<NTCPSession> conn, Pool::WorkFunc work)
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{
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m_CryptoPool->Offer({conn, work});
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}
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private:
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/** @brief return true for hard limit */
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bool ShouldHardLimit() const { return m_HardLimit && m_NTCPSessions.size() >= m_HardLimit; }
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/** @brief return true for probabalistic soft backoff */
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bool ShouldSoftLimit() const
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{
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auto sessions = m_NTCPSessions.size();
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return sessions && m_SoftLimit && m_SoftLimit < sessions && ( rand() % sessions ) <= m_SoftLimit;
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}
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void Run ();
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void HandleAccept (std::shared_ptr<NTCPSession> conn, const boost::system::error_code& error);
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void HandleAcceptV6 (std::shared_ptr<NTCPSession> conn, const boost::system::error_code& error);
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void HandleConnect (const boost::system::error_code& ecode, std::shared_ptr<NTCPSession> conn, std::shared_ptr<boost::asio::deadline_timer> timer);
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void HandleProxyConnect(const boost::system::error_code& ecode, std::shared_ptr<NTCPSession> conn, std::shared_ptr<boost::asio::deadline_timer> timer, const std::string & host, uint16_t port, RemoteAddressType adddrtype);
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void AfterSocksHandshake(std::shared_ptr<NTCPSession> conn, std::shared_ptr<boost::asio::deadline_timer> timer, const std::string & host, uint16_t port, RemoteAddressType adddrtype);
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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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boost::asio::ip::tcp::acceptor * m_NTCPAcceptor, * m_NTCPV6Acceptor;
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std::map<i2p::data::IdentHash, std::shared_ptr<NTCPSession> > m_NTCPSessions; // access from m_Thread only
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std::list<std::shared_ptr<NTCPSession> > m_PendingIncomingSessions;
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ProxyType m_ProxyType;
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std::string m_ProxyAddress;
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uint16_t m_ProxyPort;
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boost::asio::ip::tcp::resolver m_Resolver;
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boost::asio::ip::tcp::endpoint * m_ProxyEndpoint;
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std::shared_ptr<Pool> m_CryptoPool;
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uint16_t m_SoftLimit, m_HardLimit;
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public:
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// for HTTP/I2PControl
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const decltype(m_NTCPSessions)& GetNTCPSessions () const { return m_NTCPSessions; };
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};
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}
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}
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#endif
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