mirror of
https://github.com/PurpleI2P/i2pd
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195 lines
6.8 KiB
C++
195 lines
6.8 KiB
C++
#ifndef SSU_H__
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#define SSU_H__
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#include <inttypes.h>
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#include <map>
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#include <list>
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#include <set>
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#include <boost/asio.hpp>
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#include <cryptopp/modes.h>
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#include <cryptopp/aes.h>
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#include "I2PEndian.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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namespace i2p
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{
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namespace ssu
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{
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#pragma pack(1)
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struct SSUHeader
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{
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uint8_t mac[16];
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uint8_t iv[16];
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uint8_t flag;
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uint32_t time;
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uint8_t GetPayloadType () const { return flag >> 4; };
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};
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#pragma pack()
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const size_t SSU_MTU = 1484;
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const int SSU_CONNECT_TIMEOUT = 5; // 5 seconds
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const int SSU_TERMINATION_TIMEOUT = 330; // 5.5 minutes
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// payload types (4 bits)
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const uint8_t PAYLOAD_TYPE_SESSION_REQUEST = 0;
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const uint8_t PAYLOAD_TYPE_SESSION_CREATED = 1;
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const uint8_t PAYLOAD_TYPE_SESSION_CONFIRMED = 2;
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const uint8_t PAYLOAD_TYPE_RELAY_REQUEST = 3;
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const uint8_t PAYLOAD_TYPE_RELAY_RESPONSE = 4;
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const uint8_t PAYLOAD_TYPE_RELAY_INTRO = 5;
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const uint8_t PAYLOAD_TYPE_DATA = 6;
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const uint8_t PAYLOAD_TYPE_PEER_TEST = 7;
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const uint8_t PAYLOAD_TYPE_SESSION_DESTROYED = 8;
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// data flags
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const uint8_t DATA_FLAG_EXTENDED_DATA_INCLUDED = 0x02;
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const uint8_t DATA_FLAG_WANT_REPLY = 0x04;
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const uint8_t DATA_FLAG_REQUEST_PREVIOUS_ACKS = 0x08;
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const uint8_t DATA_FLAG_EXPLICIT_CONGESTION_NOTIFICATION = 0x10;
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const uint8_t DATA_FLAG_ACK_BITFIELDS_INCLUDED = 0x40;
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const uint8_t DATA_FLAG_EXPLICIT_ACKS_INCLUDED = 0x80;
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enum SessionState
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{
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eSessionStateUnknown,
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eSessionStateRequestSent,
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eSessionStateRequestReceived,
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eSessionStateCreatedSent,
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eSessionStateCreatedReceived,
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eSessionStateConfirmedSent,
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eSessionStateConfirmedReceived,
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eSessionStateRelayRequestSent,
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eSessionStateRelayRequestReceived,
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eSessionStateIntroduced,
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eSessionStateEstablished,
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eSessionStateFailed
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};
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class SSUServer;
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class SSUSession
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{
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public:
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SSUSession (SSUServer& server, boost::asio::ip::udp::endpoint& remoteEndpoint,
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const i2p::data::RouterInfo * router = nullptr, bool peerTest = false);
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void ProcessNextMessage (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& senderEndpoint);
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~SSUSession ();
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void Connect ();
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void Introduce (uint32_t iTag, const uint8_t * iKey);
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void WaitForIntroduction ();
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void Close ();
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boost::asio::ip::udp::endpoint& GetRemoteEndpoint () { return m_RemoteEndpoint; };
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const i2p::data::RouterInfo * GetRemoteRouter () const { return m_RemoteRouter; };
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void SendI2NPMessage (I2NPMessage * msg);
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void SendPeerTest (); // Alice
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private:
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void CreateAESandMacKey (const uint8_t * pubKey, uint8_t * aesKey, uint8_t * macKey);
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void ProcessMessage (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& senderEndpoint); // call for established session
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void ProcessSessionRequest (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& senderEndpoint);
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void SendSessionRequest ();
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void SendRelayRequest (uint32_t iTag, const uint8_t * iKey);
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void ProcessSessionCreated (uint8_t * buf, size_t len);
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void SendSessionCreated (const uint8_t * x);
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void ProcessSessionConfirmed (uint8_t * buf, size_t len);
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void SendSessionConfirmed (const uint8_t * y, const uint8_t * ourAddress);
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void ProcessRelayRequest (uint8_t * buf, size_t len);
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void SendRelayResponse (uint32_t nonce, const boost::asio::ip::udp::endpoint& from, const uint8_t * introKey, const boost::asio::ip::udp::endpoint& to);
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void SendRelayIntro (SSUSession * session, const boost::asio::ip::udp::endpoint& from);
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void ProcessRelayResponse (uint8_t * buf, size_t len);
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void ProcessRelayIntro (uint8_t * buf, size_t len);
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void Established ();
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void Failed ();
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void HandleConnectTimer (const boost::system::error_code& ecode);
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void ProcessPeerTest (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& senderEndpoint);
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void SendPeerTest (uint32_t nonce, uint32_t address, uint16_t port, uint8_t * introKey); // Charlie to Alice
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void ProcessData (uint8_t * buf, size_t len);
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void SendMsgAck (uint32_t msgID);
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void SendSesionDestroyed ();
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void Send (i2p::I2NPMessage * msg);
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void Send (uint8_t type, const uint8_t * payload, size_t len); // with session key
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void FillHeaderAndEncrypt (uint8_t payloadType, uint8_t * buf, size_t len, const uint8_t * aesKey, const uint8_t * iv, const uint8_t * macKey);
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void Decrypt (uint8_t * buf, size_t len, const uint8_t * aesKey);
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bool Validate (uint8_t * buf, size_t len, const uint8_t * macKey);
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const uint8_t * GetIntroKey () const;
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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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struct IncompleteMessage
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{
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I2NPMessage * msg;
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uint8_t nextFragmentNum;
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IncompleteMessage (I2NPMessage * m): msg (m), nextFragmentNum (1) {};
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};
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SSUServer& m_Server;
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boost::asio::ip::udp::endpoint m_RemoteEndpoint;
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const i2p::data::RouterInfo * m_RemoteRouter;
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boost::asio::deadline_timer m_Timer;
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i2p::data::DHKeysPair * m_DHKeysPair; // X - for client and Y - for server
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bool m_PeerTest;
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SessionState m_State;
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bool m_IsSessionKey;
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uint32_t m_RelayTag;
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std::set<uint32_t> m_PeerTestNonces;
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CryptoPP::CBC_Mode<CryptoPP::AES>::Encryption m_Encryption;
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CryptoPP::CBC_Mode<CryptoPP::AES>::Decryption m_Decryption;
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uint8_t m_SessionKey[32], m_MacKey[32];
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std::map<uint32_t, IncompleteMessage *> m_IncomleteMessages;
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std::list<i2p::I2NPMessage *> m_DelayedMessages;
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};
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class SSUServer
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{
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public:
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SSUServer (boost::asio::io_service& service, int port);
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~SSUServer ();
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void Start ();
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void Stop ();
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SSUSession * GetSession (const i2p::data::RouterInfo * router, bool peerTest = false);
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SSUSession * FindSession (const i2p::data::RouterInfo * router);
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SSUSession * FindSession (const boost::asio::ip::udp::endpoint& e);
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void DeleteSession (SSUSession * session);
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void DeleteAllSessions ();
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boost::asio::io_service& GetService () { return m_Socket.get_io_service(); };
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const boost::asio::ip::udp::endpoint& GetEndpoint () const { return m_Endpoint; };
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void Send (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& to);
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void AddRelay (uint32_t tag, const boost::asio::ip::udp::endpoint& relay);
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SSUSession * FindRelaySession (uint32_t tag);
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private:
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void Receive ();
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void HandleReceivedFrom (const boost::system::error_code& ecode, std::size_t bytes_transferred);
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private:
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boost::asio::ip::udp::endpoint m_Endpoint;
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boost::asio::ip::udp::socket m_Socket;
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boost::asio::ip::udp::endpoint m_SenderEndpoint;
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uint8_t m_ReceiveBuffer[2*SSU_MTU];
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std::map<boost::asio::ip::udp::endpoint, SSUSession *> m_Sessions;
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std::map<uint32_t, boost::asio::ip::udp::endpoint> m_Relays; // we are introducer
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public:
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// for HTTP only
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const decltype(m_Sessions)& GetSessions () 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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