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336 lines
13 KiB
C++
336 lines
13 KiB
C++
/*
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* Copyright (c) 2022, 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 SSU2_H__
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#define SSU2_H__
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#include <memory>
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#include <functional>
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#include <map>
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#include <set>
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#include <unordered_map>
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#include <boost/asio.hpp>
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#include "Crypto.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 int SSU2_CONNECT_TIMEOUT = 5; // 5 seconds
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const int SSU2_TERMINATION_TIMEOUT = 330; // 5.5 minutes
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const int SSU2_TERMINATION_CHECK_TIMEOUT = 30; // 30 seconds
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const int SSU2_TOKEN_EXPIRATION_TIMEOUT = 9; // in seconds
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const int SSU2_RELAY_NONCE_EXPIRATION_TIMEOUT = 10; // in seconds
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const int SSU2_PEER_TEST_EXPIRATION_TIMEOUT = 60; // 60 seconds
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const size_t SSU2_SOCKET_RECEIVE_BUFFER_SIZE = 0x1FFFF; // 128K
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const size_t SSU2_SOCKET_SEND_BUFFER_SIZE = 0x1FFFF; // 128K
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const size_t SSU2_MTU = 1488;
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const size_t SSU2_MAX_PAYLOAD_SIZE = SSU2_MTU - 32;
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const int SSU2_RESEND_INTERVAL = 3; // in seconds
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const int SSU2_MAX_NUM_RESENDS = 5;
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const int SSU2_INCOMPLETE_MESSAGES_CLEANUP_TIMEOUT = 30; // in seconds
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const size_t SSU2_MAX_WINDOW_SIZE = 128; // in packets
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enum SSU2MessageType
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{
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eSSU2SessionRequest = 0,
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eSSU2SessionCreated = 1,
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eSSU2SessionConfirmed = 2,
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eSSU2Data = 6,
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eSSU2PeerTest = 7,
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eSSU2Retry = 9,
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eSSU2TokenRequest = 10,
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eSSU2HolePunch = 11
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};
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enum SSU2BlockType
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{
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eSSU2BlkDateTime = 0,
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eSSU2BlkOptions, // 1
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eSSU2BlkRouterInfo, // 2
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eSSU2BlkI2NPMessage, // 3
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eSSU2BlkFirstFragment, // 4
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eSSU2BlkFollowOnFragment, // 5
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eSSU2BlkTermination, // 6
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eSSU2BlkRelayRequest, // 7
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eSSU2BlkRelayResponse, // 8
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eSSU2BlkRelayIntro, // 9
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eSSU2BlkPeerTest, // 10
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eSSU2BlkNextNonce, // 11
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eSSU2BlkAck, // 12
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eSSU2BlkAddress, // 13
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eSSU2BlkIntroKey, // 14
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eSSU2BlkRelayTagRequest, // 15
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eSSU2BlkRelayTag, // 16
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eSSU2BlkNewToken, // 17
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eSSU2BlkPathChallenge, // 18
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eSSU2BlkPathResponse, // 19
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eSSU2BlkFirstPacketNumber, // 20
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eSSU2BlkPadding = 254
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};
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enum SSU2SessionState
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{
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eSSU2SessionStateUnknown,
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eSSU2SessionStateIntroduced,
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eSSU2SessionStatePeerTest,
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eSSU2SessionStateEstablished,
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eSSU2SessionStateTerminated,
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eSSU2SessionStateFailed
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};
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struct SSU2IncompleteMessage
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{
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struct Fragment
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{
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uint8_t buf[SSU2_MTU];
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size_t len;
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bool isLast;
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};
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std::shared_ptr<I2NPMessage> msg;
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int nextFragmentNum;
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uint32_t lastFragmentInsertTime; // in seconds
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std::map<int, std::shared_ptr<Fragment> > outOfSequenceFragments;
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};
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// RouterInfo flags
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const uint8_t SSU2_ROUTER_INFO_FLAG_REQUEST_FLOOD = 0x01;
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const uint8_t SSU2_ROUTER_INFO_FLAG_GZIP = 0x02;
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class SSU2Server;
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class SSU2Session: public TransportSession, public std::enable_shared_from_this<SSU2Session>
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{
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union Header
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{
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uint64_t ll[2];
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uint8_t buf[16];
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struct
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{
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uint64_t connID;
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uint32_t packetNum;
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uint8_t type;
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uint8_t flags[3];
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} h;
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};
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struct SentPacket
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{
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uint8_t payload[SSU2_MAX_PAYLOAD_SIZE];
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size_t payloadSize = 0;
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uint32_t nextResendTime; // in seconds
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int numResends = 0;
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};
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struct SessionConfirmedFragment
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{
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Header header;
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uint8_t payload[SSU2_MAX_PAYLOAD_SIZE];
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size_t payloadSize;
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};
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typedef std::function<void ()> OnEstablished;
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public:
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SSU2Session (SSU2Server& 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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~SSU2Session ();
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void SetRemoteEndpoint (const boost::asio::ip::udp::endpoint& ep) { m_RemoteEndpoint = ep; };
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const boost::asio::ip::udp::endpoint& GetRemoteEndpoint () const { return m_RemoteEndpoint; };
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void SetOnEstablished (OnEstablished e) { m_OnEstablished = e; };
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void Connect ();
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bool Introduce (std::shared_ptr<SSU2Session> session, uint32_t relayTag);
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void Terminate ();
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void TerminateByTimeout ();
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void CleanUp (uint64_t ts);
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void FlushData ();
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void Done () override;
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void SendI2NPMessages (const std::vector<std::shared_ptr<I2NPMessage> >& msgs) override;
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void Resend (uint64_t ts);
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bool IsEstablished () const { return m_State == eSSU2SessionStateEstablished; };
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uint64_t GetConnID () const { return m_SourceConnID; };
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SSU2SessionState GetState () const { return m_State; };
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void SetState (SSU2SessionState state) { m_State = state; };
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bool ProcessFirstIncomingMessage (uint64_t connID, uint8_t * buf, size_t len);
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bool ProcessSessionCreated (uint8_t * buf, size_t len);
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bool ProcessSessionConfirmed (uint8_t * buf, size_t len);
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bool ProcessRetry (uint8_t * buf, size_t len);
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bool ProcessHolePunch (uint8_t * buf, size_t len);
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bool ProcessPeerTest (uint8_t * buf, size_t len);
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void ProcessData (uint8_t * buf, size_t len);
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private:
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void Established ();
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void PostI2NPMessages (std::vector<std::shared_ptr<I2NPMessage> > msgs);
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bool SendQueue ();
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void SendFragmentedMessage (std::shared_ptr<I2NPMessage> msg);
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void ProcessSessionRequest (Header& header, uint8_t * buf, size_t len);
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void ProcessTokenRequest (Header& header, uint8_t * buf, size_t len);
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void SendSessionRequest (uint64_t token = 0);
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void SendSessionCreated (const uint8_t * X);
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void SendSessionConfirmed (const uint8_t * Y);
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void KDFDataPhase (uint8_t * keydata_ab, uint8_t * keydata_ba);
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void SendTokenRequest ();
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void SendRetry ();
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uint32_t SendData (const uint8_t * buf, size_t len); // returns packet num
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void SendQuickAck ();
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void SendTermination ();
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void SendHolePunch (uint32_t nonce, const boost::asio::ip::udp::endpoint& ep, const uint8_t * introKey);
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void HandlePayload (const uint8_t * buf, size_t len);
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void HandleAck (const uint8_t * buf, size_t len);
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void HandleAckRange (uint32_t firstPacketNum, uint32_t lastPacketNum);
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bool ExtractEndpoint (const uint8_t * buf, size_t size, boost::asio::ip::udp::endpoint& ep);
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size_t CreateEndpoint (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& ep);
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std::shared_ptr<const i2p::data::RouterInfo> ExtractRouterInfo (const uint8_t * buf, size_t size);
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void CreateNonce (uint64_t seqn, uint8_t * nonce);
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bool UpdateReceivePacketNum (uint32_t packetNum); // for Ack, returns false if duplicate
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void HandleFirstFragment (const uint8_t * buf, size_t len);
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void HandleFollowOnFragment (const uint8_t * buf, size_t len);
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bool ConcatOutOfSequenceFragments (std::shared_ptr<SSU2IncompleteMessage> m); // true if message complete
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void HandleRelayRequest (const uint8_t * buf, size_t len);
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void HandleRelayIntro (const uint8_t * buf, size_t len);
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void HandleRelayResponse (const uint8_t * buf, size_t len);
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void HandlePeerTest (const uint8_t * buf, size_t len);
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size_t CreateAddressBlock (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& ep);
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size_t CreateRouterInfoBlock (uint8_t * buf, size_t len, std::shared_ptr<const i2p::data::RouterInfo> r);
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size_t CreateAckBlock (uint8_t * buf, size_t len);
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size_t CreatePaddingBlock (uint8_t * buf, size_t len, size_t minSize = 0);
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size_t CreateI2NPBlock (uint8_t * buf, size_t len, std::shared_ptr<I2NPMessage>&& msg);
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size_t CreateFirstFragmentBlock (uint8_t * buf, size_t len, std::shared_ptr<I2NPMessage> msg);
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size_t CreateFollowOnFragmentBlock (uint8_t * buf, size_t len, std::shared_ptr<I2NPMessage> msg, uint8_t& fragmentNum, uint32_t msgID);
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size_t CreateRelayIntroBlock (uint8_t * buf, size_t len, const uint8_t * introData, size_t introDataLen);
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size_t CreateRelayResponseBlock (uint8_t * buf, size_t len, uint32_t nonce); // Charlie
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size_t CreatePeerTestBlock (uint8_t * buf, size_t len, uint8_t msg, const uint8_t * routerHash, const uint8_t * signedData, size_t signedDataLen);
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private:
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SSU2Server& m_Server;
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std::shared_ptr<i2p::crypto::X25519Keys> m_EphemeralKeys;
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std::unique_ptr<i2p::crypto::NoiseSymmetricState> m_NoiseState;
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std::unique_ptr<SessionConfirmedFragment> m_SessionConfirmedFragment1; // for Bob if applicable
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std::shared_ptr<const i2p::data::RouterInfo::Address> m_Address;
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boost::asio::ip::udp::endpoint m_RemoteEndpoint;
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uint64_t m_DestConnID, m_SourceConnID;
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SSU2SessionState m_State;
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uint8_t m_KeyDataSend[64], m_KeyDataReceive[64];
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uint32_t m_SendPacketNum, m_ReceivePacketNum;
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std::set<uint32_t> m_OutOfSequencePackets; // packet nums > receive packet num
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std::map<uint32_t, std::shared_ptr<SentPacket> > m_SentPackets; // packetNum -> packet
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std::map<uint32_t, std::shared_ptr<SSU2IncompleteMessage> > m_IncompleteMessages; // I2NP
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std::map<uint32_t, std::pair <std::shared_ptr<SSU2Session>, uint64_t > > m_RelaySessions; // nonce->(Alice, timestamp) for Bob or nonce->(Charlie, timestamp) for Alice
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std::map<uint32_t, std::pair <std::shared_ptr<SSU2Session>, uint64_t > > m_PeerTests; // same as for relay sessions
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std::list<std::shared_ptr<I2NPMessage> > m_SendQueue;
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i2p::I2NPMessagesHandler m_Handler;
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bool m_IsDataReceived;
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size_t m_WindowSize;
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uint32_t m_RelayTag; // between Bob and Charlie
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OnEstablished m_OnEstablished; // callback from Established
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};
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class SSU2Server: private i2p::util::RunnableServiceWithWork
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{
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struct Packet
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{
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uint8_t buf[SSU2_MTU];
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size_t len;
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boost::asio::ip::udp::endpoint from;
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};
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class ReceiveService: public i2p::util::RunnableService
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{
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public:
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ReceiveService (const std::string& name): RunnableService (name) {};
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boost::asio::io_service& GetService () { return GetIOService (); };
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void Start () { StartIOService (); };
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void Stop () { StopIOService (); };
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};
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public:
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SSU2Server ();
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~SSU2Server () {};
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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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void AddSession (std::shared_ptr<SSU2Session> session);
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void RemoveSession (uint64_t connID);
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void AddSessionByRouterHash (std::shared_ptr<SSU2Session> session);
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void AddPendingOutgoingSession (std::shared_ptr<SSU2Session> session);
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void AddRelay (uint32_t tag, std::shared_ptr<SSU2Session> relay);
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void RemoveRelay (uint32_t tag);
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std::shared_ptr<SSU2Session> FindRelaySession (uint32_t tag);
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void Send (const uint8_t * header, size_t headerLen, const uint8_t * payload, size_t payloadLen,
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const boost::asio::ip::udp::endpoint& to);
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void Send (const uint8_t * header, size_t headerLen, const uint8_t * headerX, size_t headerXLen,
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const uint8_t * payload, size_t payloadLen, const boost::asio::ip::udp::endpoint& to);
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bool CreateSession (std::shared_ptr<const i2p::data::RouterInfo> router,
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std::shared_ptr<const i2p::data::RouterInfo::Address> address);
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void UpdateOutgoingToken (const boost::asio::ip::udp::endpoint& ep, uint64_t token, uint32_t exp);
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uint64_t FindOutgoingToken (const boost::asio::ip::udp::endpoint& ep) const;
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uint64_t GetIncomingToken (const boost::asio::ip::udp::endpoint& ep);
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private:
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boost::asio::ip::udp::socket& OpenSocket (const boost::asio::ip::udp::endpoint& localEndpoint);
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void Receive (boost::asio::ip::udp::socket& socket);
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void HandleReceivedFrom (const boost::system::error_code& ecode, size_t bytes_transferred,
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Packet * packet, boost::asio::ip::udp::socket& socket);
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void HandleReceivedPacket (Packet * packet);
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void HandleReceivedPackets (std::vector<Packet *> packets);
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void ProcessNextPacket (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& senderEndpoint);
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void ScheduleTermination ();
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void HandleTerminationTimer (const boost::system::error_code& ecode);
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void ScheduleResend ();
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void HandleResendTimer (const boost::system::error_code& ecode);
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void ConnectThroughIntroducer (std::shared_ptr<const i2p::data::RouterInfo> router,
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std::shared_ptr<const i2p::data::RouterInfo::Address> address);
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private:
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ReceiveService m_ReceiveService;
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boost::asio::ip::udp::socket m_SocketV4, m_SocketV6;
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std::unordered_map<uint64_t, std::shared_ptr<SSU2Session> > m_Sessions;
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std::map<i2p::data::IdentHash, std::shared_ptr<SSU2Session> > m_SessionsByRouterHash;
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std::map<boost::asio::ip::udp::endpoint, std::shared_ptr<SSU2Session> > m_PendingOutgoingSessions;
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std::map<boost::asio::ip::udp::endpoint, std::pair<uint64_t, uint32_t> > m_IncomingTokens, m_OutgoingTokens; // remote endpoint -> (token, expires in seconds)
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std::map<uint32_t, std::shared_ptr<SSU2Session> > m_Relays; // we are introducer, relay tag -> session
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i2p::util::MemoryPoolMt<Packet> m_PacketsPool;
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boost::asio::deadline_timer m_TerminationTimer, m_ResendTimer;
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std::shared_ptr<SSU2Session> m_LastSession;
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public:
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// for HTTP/I2PControl
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const decltype(m_Sessions)& GetSSU2Sessions () const { return m_Sessions; };
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};
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}
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}
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#endif
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