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@ -8,142 +8,20 @@
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#include <set>
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#include <thread>
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#include <boost/asio.hpp>
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#include "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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#include "TransportSession.h"
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#include "SSUData.h"
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#include "SSUSession.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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#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 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_KEEP_ALIVE_INTERVAL = 30; // 30 seconds
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const int SSU_TO_INTRODUCER_SESSION_DURATION = 3600; // 1 hour
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const size_t SSU_MAX_NUM_INTRODUCERS = 3;
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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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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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eSessionStateFailed
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};
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class SSUServer;
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class SSUSession: public TransportSession
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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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bool IsV6 () const { return m_RemoteEndpoint.address ().is_v6 (); };
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void SendI2NPMessage (I2NPMessage * msg);
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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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uint32_t GetCreationTime () const { return m_CreationTime; };
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private:
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void CreateAESandMacKey (const uint8_t * pubKey);
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void PostI2NPMessage (I2NPMessage * msg);
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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, size_t ourAddressLen);
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void ProcessRelayRequest (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 (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 ScheduleConnectTimer ();
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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, const uint8_t * introKey, bool toAddress = true);
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void ProcessData (uint8_t * buf, size_t len);
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void SendSesionDestroyed ();
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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 uint8_t * aesKey, const uint8_t * iv, const uint8_t * macKey);
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void FillHeaderAndEncrypt (uint8_t payloadType, uint8_t * buf, size_t len); // with session key
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void Decrypt (uint8_t * buf, size_t len, const uint8_t * 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 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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friend class SSUData; // TODO: change in later
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SSUServer& m_Server;
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boost::asio::ip::udp::endpoint m_RemoteEndpoint;
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boost::asio::deadline_timer m_Timer;
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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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i2p::crypto::CBCEncryption m_SessionKeyEncryption;
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i2p::crypto::CBCDecryption m_SessionKeyDecryption;
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uint8_t m_SessionKey[32], m_MacKey[32];
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std::list<i2p::I2NPMessage *> m_DelayedMessages;
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SSUData m_Data;
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size_t m_NumSentBytes, m_NumReceivedBytes;
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uint32_t m_CreationTime; // seconds since epoch
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};
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class SSUServer
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{
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public:
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orignal
10 years ago