mirror of
https://github.com/PurpleI2P/i2pd.git
synced 2024-10-31 09:20:38 +00:00
178 lines
6.9 KiB
C++
178 lines
6.9 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 SSU_SESSION_H__
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#define SSU_SESSION_H__
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#include <inttypes.h>
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#include <set>
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#include <memory>
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#include "Crypto.h"
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#include "I2NPProtocol.h"
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#include "TransportSession.h"
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#include "SSUData.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 uint8_t SSU_HEADER_EXTENDED_OPTIONS_INCLUDED = 0x04;
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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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uint8_t time[4];
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uint8_t GetPayloadType () const { return flag >> 4; };
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bool IsExtendedOptions () const { return flag & SSU_HEADER_EXTENDED_OPTIONS_INCLUDED; };
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};
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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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const int SSU_CLOCK_SKEW = 60; // in seconds
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const size_t SSU_MAX_I2NP_MESSAGE_SIZE = 32768;
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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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// extended options
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const uint16_t EXTENDED_OPTIONS_FLAG_REQUEST_RELAY_TAG = 0x0001;
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enum SessionState
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{
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eSessionStateUnknown,
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eSessionStateIntroduced,
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eSessionStateEstablished,
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eSessionStateClosed,
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eSessionStateFailed
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};
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enum PeerTestParticipant
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{
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ePeerTestParticipantUnknown = 0,
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ePeerTestParticipantAlice1,
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ePeerTestParticipantAlice2,
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ePeerTestParticipantBob,
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ePeerTestParticipantCharlie
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};
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class SSUServer;
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class SSUSession: public TransportSession, public std::enable_shared_from_this<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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std::shared_ptr<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 WaitForConnect ();
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void Introduce (const i2p::data::RouterInfo::Introducer& introducer,
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std::shared_ptr<const i2p::data::RouterInfo> to); // Alice to Charlie
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void WaitForIntroduction ();
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void Close ();
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void Done ();
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void Failed ();
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const boost::asio::ip::udp::endpoint& GetRemoteEndpoint () { return m_RemoteEndpoint; };
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bool IsV6 () const { return m_RemoteEndpoint.address ().is_v6 (); };
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void SendI2NPMessages (const std::vector<std::shared_ptr<I2NPMessage> >& msgs);
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void SendPeerTest (); // Alice
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SessionState GetState () const { return m_State; };
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size_t GetNumSentBytes () const { return m_NumSentBytes; };
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size_t GetNumReceivedBytes () const { return m_NumReceivedBytes; };
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void SendKeepAlive ();
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uint32_t GetRelayTag () const { return m_RelayTag; };
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const i2p::data::RouterInfo::IntroKey& GetIntroKey () const { return m_IntroKey; };
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uint32_t GetCreationTime () const { return m_CreationTime; };
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void SetCreationTime (uint32_t ts) { m_CreationTime = ts; }; // for introducers
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void FlushData ();
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private:
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boost::asio::io_service& GetService ();
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void CreateAESandMacKey (const uint8_t * pubKey);
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size_t GetSSUHeaderSize (const uint8_t * buf) const;
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void PostI2NPMessages (std::vector<std::shared_ptr<I2NPMessage> > msgs);
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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 (const uint8_t * buf, size_t len);
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void SendSessionRequest ();
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void SendRelayRequest (const i2p::data::RouterInfo::Introducer& introducer, uint32_t nonce);
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void ProcessSessionCreated (uint8_t * buf, size_t len);
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void SendSessionCreated (const uint8_t * x, bool sendRelayTag = true);
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void ProcessSessionConfirmed (const uint8_t * buf, size_t len);
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void SendSessionConfirmed (const uint8_t * y, const uint8_t * ourAddress, size_t ourAddressLen);
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void ProcessRelayRequest (const uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& from);
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void SendRelayResponse (uint32_t nonce, const boost::asio::ip::udp::endpoint& from,
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const uint8_t * introKey, const boost::asio::ip::udp::endpoint& to);
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void SendRelayIntro (std::shared_ptr<SSUSession> session, const boost::asio::ip::udp::endpoint& from);
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void ProcessRelayResponse (const uint8_t * buf, size_t len);
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void ProcessRelayIntro (const uint8_t * buf, size_t len);
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void Established ();
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void ScheduleConnectTimer ();
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void HandleConnectTimer (const boost::system::error_code& ecode);
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void ProcessPeerTest (const uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& senderEndpoint);
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void SendPeerTest (uint32_t nonce, const boost::asio::ip::address& address, uint16_t port, const uint8_t * introKey, bool toAddress = true, bool sendAddress = true);
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void ProcessData (uint8_t * buf, size_t len);
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void SendSessionDestroyed ();
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void Send (uint8_t type, const uint8_t * payload, size_t len); // with session key
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void Send (const uint8_t * buf, size_t size);
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void FillHeaderAndEncrypt (uint8_t payloadType, uint8_t * buf, size_t len, const i2p::crypto::AESKey& aesKey,
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const uint8_t * iv, const i2p::crypto::MACKey& macKey, uint8_t flag = 0);
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void FillHeaderAndEncrypt (uint8_t payloadType, uint8_t * buf, size_t len); // with session key
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void FillHeaderAndEncrypt (uint8_t payloadType, uint8_t * in, size_t len, uint8_t * out); // with session key
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void Decrypt (uint8_t * buf, size_t len, const i2p::crypto::AESKey& aesKey);
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void DecryptSessionKey (uint8_t * buf, size_t len);
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bool Validate (uint8_t * buf, size_t len, const i2p::crypto::MACKey& macKey);
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void Reset ();
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static size_t ExtractIPAddressAndPort (const uint8_t * buf, size_t len, boost::asio::ip::address& ip, uint16_t& port); // returns actual buf size
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private:
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friend class SSUData; // TODO: change in later
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SSUServer& m_Server;
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const boost::asio::ip::udp::endpoint m_RemoteEndpoint;
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boost::asio::deadline_timer m_ConnectTimer;
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bool m_IsPeerTest;
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SessionState m_State;
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bool m_IsSessionKey;
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uint32_t m_RelayTag; // received from peer
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uint32_t m_SentRelayTag; // sent by us
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i2p::crypto::CBCEncryption m_SessionKeyEncryption;
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i2p::crypto::CBCDecryption m_SessionKeyDecryption;
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i2p::crypto::AESKey m_SessionKey;
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i2p::crypto::MACKey m_MacKey;
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i2p::data::RouterInfo::IntroKey m_IntroKey;
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uint32_t m_CreationTime; // seconds since epoch
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SSUData m_Data;
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bool m_IsDataReceived;
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std::unique_ptr<SignedData> m_SignedData; // we need it for SessionConfirmed only
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std::map<uint32_t, std::shared_ptr<const i2p::data::RouterInfo> > m_RelayRequests; // nonce->Charlie
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std::shared_ptr<i2p::crypto::DHKeys> m_DHKeysPair; // X - for client and Y - for server
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};
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}
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}
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#endif
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