mirror of
https://github.com/PurpleI2P/i2pd
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307 lines
11 KiB
C++
307 lines
11 KiB
C++
/*
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* Copyright (c) 2013-2024, 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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*/
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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 <list>
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#include <map>
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#include <array>
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#include <random>
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#include <openssl/bn.h>
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#include <openssl/evp.h>
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#include <boost/asio.hpp>
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#include "Crypto.h"
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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 size_t NTCP2_SEND_AFTER_FRAME_SIZE = 16386; // send frame when exceeds this size
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const size_t NTCP2_SESSION_REQUEST_MAX_SIZE = 287;
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const size_t NTCP2_SESSION_CREATED_MAX_SIZE = 287;
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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 = 115; // 2 minutes - 5 seconds
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const int NTCP2_TERMINATION_TIMEOUT_VARIANCE = 10; // 10 seconds
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const int NTCP2_TERMINATION_CHECK_TIMEOUT = 28; // 28 seconds
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const int NTCP2_TERMINATION_CHECK_TIMEOUT_VARIANCE = 5; // 5 seconds
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const int NTCP2_RECEIVE_BUFFER_DELETION_TIMEOUT = 3; // 3 seconds
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const int NTCP2_ROUTERINFO_RESEND_INTERVAL = 25*60; // 25 minuntes in seconds
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const int NTCP2_ROUTERINFO_RESEND_INTERVAL_THRESHOLD = 25*60; // 25 minuntes
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const int NTCP2_CLOCK_SKEW = 60; // in seconds
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const int NTCP2_MAX_OUTGOING_QUEUE_SIZE = 500; // how many messages we can queue up
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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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// RouterInfo flags
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const uint8_t NTCP2_ROUTER_INFO_FLAG_REQUEST_FLOOD = 0x01;
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struct NTCP2Establisher: private i2p::crypto::NoiseSymmetricState
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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_EphemeralKeys->GetPublicKey (); };
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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_CK + 32; };
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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 KeyDerivationFunction1 (const uint8_t * pub, i2p::crypto::X25519Keys& 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 (std::mt19937& rng);
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void CreateSessionCreatedMessage (std::mt19937& rng);
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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, bool& clockSkew);
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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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std::shared_ptr<i2p::crypto::X25519Keys> m_EphemeralKeys;
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uint8_t m_RemoteEphemeralPublicKey[32]; // x25519
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uint8_t m_RemoteStaticKey[32], m_IV[16];
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i2p::data::IdentHash m_RemoteIdentHash;
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uint16_t m3p2Len;
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uint8_t m_SessionRequestBuffer[NTCP2_SESSION_REQUEST_MAX_SIZE],
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m_SessionCreatedBuffer[NTCP2_SESSION_CREATED_MAX_SIZE], * 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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std::shared_ptr<const i2p::data::RouterInfo::Address> addr = nullptr);
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~NTCP2Session ();
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void Terminate ();
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void TerminateByTimeout ();
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void Done () override;
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void Close (); // for accept
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void DeleteNextReceiveBuffer (uint64_t ts);
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boost::asio::ip::tcp::socket& GetSocket () { return m_Socket; };
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const boost::asio::ip::tcp::endpoint& GetRemoteEndpoint () { return m_RemoteEndpoint; };
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void SetRemoteEndpoint (const boost::asio::ip::tcp::endpoint& ep) { m_RemoteEndpoint = ep; };
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bool IsEstablished () const override { 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 (bool update) override; // after handshake or by update
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void SendI2NPMessages (std::list<std::shared_ptr<I2NPMessage> >& msgs) override;
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void MoveSendQueue (std::shared_ptr<NTCP2Session> other);
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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 CreateNextReceivedBuffer (size_t size);
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void KeyDerivationFunctionDataPhase ();
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void SetSipKeys (const uint8_t * sendSipKey, const uint8_t * receiveSipKey);
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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 SetNextSentFrameLength (size_t frameLen, uint8_t * lengthBuf);
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void SendI2NPMsgs (std::vector<std::shared_ptr<I2NPMessage> >& msgs);
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void HandleI2NPMsgsSent (const boost::system::error_code& ecode, std::size_t bytes_transferred, std::vector<std::shared_ptr<I2NPMessage> > msgs);
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void EncryptAndSendNextBuffer (size_t payloadLen);
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void HandleNextFrameSent (const boost::system::error_code& ecode, std::size_t bytes_transferred);
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size_t CreatePaddingBlock (size_t msgLen, uint8_t * buf, size_t len);
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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 ();
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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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boost::asio::ip::tcp::endpoint m_RemoteEndpoint;
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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[32], m_Kba[32], m_Sipkeysab[32], m_Sipkeysba[32];
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const uint8_t * m_SendKey, * m_ReceiveKey;
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#if OPENSSL_SIPHASH
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EVP_MD_CTX * m_SendMDCtx, * m_ReceiveMDCtx;
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#else
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const uint8_t * m_SendSipKey, * m_ReceiveSipKey;
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#endif
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uint16_t m_NextReceivedLen;
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uint8_t * m_NextReceivedBuffer, * m_NextSendBuffer;
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size_t m_NextReceivedBufferSize;
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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, m_IsReceiving;
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std::list<std::shared_ptr<I2NPMessage> > m_SendQueue;
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uint64_t m_NextRouterInfoResendTime; // seconds since epoch
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std::list<std::shared_ptr<I2NPMessage> > m_IntermediateQueue; // from transports
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mutable std::mutex m_IntermediateQueueMutex;
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uint16_t m_PaddingSizes[16];
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int m_NextPaddingSize;
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};
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class NTCP2Server: private i2p::util::RunnableServiceWithWork
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{
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public:
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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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NTCP2Server ();
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~NTCP2Server ();
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void Start ();
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void Stop ();
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boost::asio::io_service& GetService () { return GetIOService (); };
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std::mt19937& GetRng () { return m_Rng; };
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bool AddNTCP2Session (std::shared_ptr<NTCP2Session> session, bool incoming = false);
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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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void ConnectWithProxy (std::shared_ptr<NTCP2Session> conn);
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void Connect(std::shared_ptr<NTCP2Session> conn);
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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, const std::string& user, const std::string& pass);
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void SetLocalAddress (const boost::asio::ip::address& localAddress);
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private:
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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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void HandleProxyConnect(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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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::map<boost::asio::ip::address, std::shared_ptr<NTCP2Session> > m_PendingIncomingSessions;
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ProxyType m_ProxyType;
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std::string m_ProxyAddress, m_ProxyAuthorization;
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uint16_t m_ProxyPort;
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boost::asio::ip::tcp::resolver m_Resolver;
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std::unique_ptr<boost::asio::ip::tcp::endpoint> m_ProxyEndpoint;
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std::shared_ptr<boost::asio::ip::tcp::endpoint> m_Address4, m_Address6, m_YggdrasilAddress;
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std::mt19937 m_Rng;
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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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