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597 lines
17 KiB
C++
597 lines
17 KiB
C++
#include <string.h>
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#include <stdlib.h>
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#include "I2PEndian.h"
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#include <boost/bind.hpp>
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#include <cryptopp/dh.h>
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#include <cryptopp/dsa.h>
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#include "base64.h"
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#include "Log.h"
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#include "Timestamp.h"
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#include "CryptoConst.h"
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#include "I2NPProtocol.h"
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#include "RouterContext.h"
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#include "Transports.h"
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#include "NTCPSession.h"
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using namespace i2p::crypto;
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namespace i2p
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{
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namespace ntcp
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{
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NTCPSession::NTCPSession (boost::asio::io_service& service, i2p::data::RouterInfo& in_RemoteRouterInfo):
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m_Socket (service), m_TerminationTimer (service), m_IsEstablished (false),
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m_RemoteRouterInfo (in_RemoteRouterInfo), m_ReceiveBufferOffset (0), m_NextMessage (nullptr),
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m_NumSentBytes (0), m_NumReceivedBytes (0)
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{
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m_DHKeysPair = i2p::transports.GetNextDHKeysPair ();
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}
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NTCPSession::~NTCPSession ()
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{
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delete m_DHKeysPair;
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}
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void NTCPSession::CreateAESKey (uint8_t * pubKey, uint8_t * aesKey)
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{
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CryptoPP::DH dh (elgp, elgg);
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uint8_t sharedKey[256];
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if (!dh.Agree (sharedKey, m_DHKeysPair->privateKey, pubKey))
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{
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LogPrint ("Couldn't create shared key");
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Terminate ();
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return;
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};
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if (sharedKey[0] & 0x80)
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{
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aesKey[0] = 0;
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memcpy (aesKey + 1, sharedKey, 31);
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}
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else if (sharedKey[0])
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memcpy (aesKey, sharedKey, 32);
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else
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{
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// find first non-zero byte
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uint8_t * nonZero = sharedKey + 1;
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while (!*nonZero)
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{
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nonZero++;
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if (nonZero - sharedKey > 32)
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{
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LogPrint ("First 32 bytes of shared key is all zeros. Ignored");
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return;
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}
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}
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memcpy (aesKey, nonZero, 32);
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}
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}
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void NTCPSession::Terminate ()
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{
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m_IsEstablished = false;
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m_Socket.close ();
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i2p::transports.RemoveNTCPSession (this);
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int numDelayed = 0;
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for (auto it :m_DelayedMessages)
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{
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// try to send them again
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i2p::transports.SendMessage (m_RemoteRouterInfo.GetIdentHash (), it);
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numDelayed++;
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}
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m_DelayedMessages.clear ();
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if (numDelayed > 0)
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LogPrint ("NTCP session ", numDelayed, " not sent");
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// TODO: notify tunnels
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delete this;
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LogPrint ("NTCP session terminated");
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}
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void NTCPSession::Connected ()
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{
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LogPrint ("NTCP session connected");
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m_IsEstablished = true;
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SendTimeSyncMessage ();
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SendI2NPMessage (CreateDatabaseStoreMsg ()); // we tell immediately who we are
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if (!m_DelayedMessages.empty ())
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{
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for (auto it :m_DelayedMessages)
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SendI2NPMessage (it);
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m_DelayedMessages.clear ();
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}
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}
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void NTCPSession::ClientLogin ()
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{
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// send Phase1
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const uint8_t * x = m_DHKeysPair->publicKey;
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memcpy (m_Phase1.pubKey, x, 256);
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CryptoPP::SHA256().CalculateDigest(m_Phase1.HXxorHI, x, 256);
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const uint8_t * ident = m_RemoteRouterInfo.GetIdentHash ();
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for (int i = 0; i < 32; i++)
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m_Phase1.HXxorHI[i] ^= ident[i];
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boost::asio::async_write (m_Socket, boost::asio::buffer (&m_Phase1, sizeof (m_Phase1)), boost::asio::transfer_all (),
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boost::bind(&NTCPSession::HandlePhase1Sent, this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred));
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}
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void NTCPSession::ServerLogin ()
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{
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// receive Phase1
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boost::asio::async_read (m_Socket, boost::asio::buffer(&m_Phase1, sizeof (m_Phase1)),
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boost::bind(&NTCPSession::HandlePhase1Received, this,
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boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred));
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}
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void NTCPSession::HandlePhase1Sent (const boost::system::error_code& ecode, std::size_t bytes_transferred)
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{
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if (ecode)
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{
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LogPrint ("Couldn't send Phase 1 message: ", ecode.message ());
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Terminate ();
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}
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else
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{
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LogPrint ("Phase 1 sent: ", bytes_transferred);
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boost::asio::async_read (m_Socket, boost::asio::buffer(&m_Phase2, sizeof (m_Phase2)),
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boost::bind(&NTCPSession::HandlePhase2Received, this,
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boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred));
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}
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}
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void NTCPSession::HandlePhase1Received (const boost::system::error_code& ecode, std::size_t bytes_transferred)
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{
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if (ecode)
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{
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LogPrint ("Phase 1 read error: ", ecode.message ());
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Terminate ();
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}
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else
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{
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LogPrint ("Phase 1 received: ", bytes_transferred);
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// verify ident
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uint8_t digest[32];
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CryptoPP::SHA256().CalculateDigest(digest, m_Phase1.pubKey, 256);
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const uint8_t * ident = i2p::context.GetRouterInfo ().GetIdentHash ();
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for (int i = 0; i < 32; i++)
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{
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if ((m_Phase1.HXxorHI[i] ^ ident[i]) != digest[i])
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{
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LogPrint ("Wrong ident");
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Terminate ();
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return;
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}
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}
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SendPhase2 ();
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}
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}
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void NTCPSession::SendPhase2 ()
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{
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const uint8_t * y = m_DHKeysPair->publicKey;
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memcpy (m_Phase2.pubKey, y, 256);
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uint8_t xy[512];
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memcpy (xy, m_Phase1.pubKey, 256);
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memcpy (xy + 256, y, 256);
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CryptoPP::SHA256().CalculateDigest(m_Phase2.encrypted.hxy, xy, 512);
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uint32_t tsB = htobe32 (i2p::util::GetSecondsSinceEpoch ());
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m_Phase2.encrypted.timestamp = tsB;
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// TODO: fill filler
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uint8_t aesKey[32];
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CreateAESKey (m_Phase1.pubKey, aesKey);
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m_Encryption.SetKey (aesKey);
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m_Encryption.SetIV (y + 240);
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m_Decryption.SetKey (aesKey);
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m_Decryption.SetIV (m_Phase1.HXxorHI + 16);
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m_Encryption.Encrypt ((uint8_t *)&m_Phase2.encrypted, sizeof(m_Phase2.encrypted), (uint8_t *)&m_Phase2.encrypted);
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boost::asio::async_write (m_Socket, boost::asio::buffer (&m_Phase2, sizeof (m_Phase2)), boost::asio::transfer_all (),
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boost::bind(&NTCPSession::HandlePhase2Sent, this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred, tsB));
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}
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void NTCPSession::HandlePhase2Sent (const boost::system::error_code& ecode, std::size_t bytes_transferred, uint32_t tsB)
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{
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if (ecode)
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{
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LogPrint ("Couldn't send Phase 2 message: ", ecode.message ());
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Terminate ();
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}
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else
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{
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LogPrint ("Phase 2 sent: ", bytes_transferred);
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boost::asio::async_read (m_Socket, boost::asio::buffer(&m_Phase3, sizeof (m_Phase3)),
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boost::bind(&NTCPSession::HandlePhase3Received, this,
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boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred, tsB));
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}
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}
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void NTCPSession::HandlePhase2Received (const boost::system::error_code& ecode, std::size_t bytes_transferred)
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{
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if (ecode)
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{
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LogPrint ("Phase 2 read error: ", ecode.message (), ". Wrong ident assumed");
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GetRemoteRouterInfo ().SetUnreachable (true); // this RouterInfo is not valid
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Terminate ();
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}
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else
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{
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LogPrint ("Phase 2 received: ", bytes_transferred);
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uint8_t aesKey[32];
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CreateAESKey (m_Phase2.pubKey, aesKey);
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m_Decryption.SetKey (aesKey);
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m_Decryption.SetIV (m_Phase2.pubKey + 240);
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m_Encryption.SetKey (aesKey);
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m_Encryption.SetIV (m_Phase1.HXxorHI + 16);
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m_Decryption.Decrypt((uint8_t *)&m_Phase2.encrypted, sizeof(m_Phase2.encrypted), (uint8_t *)&m_Phase2.encrypted);
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// verify
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uint8_t xy[512], hxy[32];
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memcpy (xy, m_DHKeysPair->publicKey, 256);
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memcpy (xy + 256, m_Phase2.pubKey, 256);
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CryptoPP::SHA256().CalculateDigest(hxy, xy, 512);
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if (memcmp (hxy, m_Phase2.encrypted.hxy, 32))
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{
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LogPrint ("Incorrect hash");
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Terminate ();
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return ;
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}
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SendPhase3 ();
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}
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}
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void NTCPSession::SendPhase3 ()
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{
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m_Phase3.size = htons (sizeof (m_Phase3.ident));
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memcpy (&m_Phase3.ident, &i2p::context.GetRouterIdentity (), sizeof (m_Phase3.ident));
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uint32_t tsA = htobe32 (i2p::util::GetSecondsSinceEpoch ());
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m_Phase3.timestamp = tsA;
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SignedData s;
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memcpy (s.x, m_Phase1.pubKey, 256);
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memcpy (s.y, m_Phase2.pubKey, 256);
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memcpy (s.ident, m_RemoteRouterInfo.GetIdentHash (), 32);
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s.tsA = tsA;
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s.tsB = m_Phase2.encrypted.timestamp;
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i2p::context.Sign ((uint8_t *)&s, sizeof (s), m_Phase3.signature);
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m_Encryption.Encrypt((uint8_t *)&m_Phase3, sizeof(m_Phase3), (uint8_t *)&m_Phase3);
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boost::asio::async_write (m_Socket, boost::asio::buffer (&m_Phase3, sizeof (m_Phase3)), boost::asio::transfer_all (),
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boost::bind(&NTCPSession::HandlePhase3Sent, this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred, tsA));
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}
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void NTCPSession::HandlePhase3Sent (const boost::system::error_code& ecode, std::size_t bytes_transferred, uint32_t tsA)
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{
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if (ecode)
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{
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LogPrint ("Couldn't send Phase 3 message: ", ecode.message ());
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Terminate ();
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}
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else
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{
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LogPrint ("Phase 3 sent: ", bytes_transferred);
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boost::asio::async_read (m_Socket, boost::asio::buffer(&m_Phase4, sizeof (m_Phase4)),
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boost::bind(&NTCPSession::HandlePhase4Received, this,
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boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred, tsA));
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}
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}
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void NTCPSession::HandlePhase3Received (const boost::system::error_code& ecode, std::size_t bytes_transferred, uint32_t tsB)
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{
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if (ecode)
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{
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LogPrint ("Phase 3 read error: ", ecode.message ());
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Terminate ();
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}
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else
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{
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LogPrint ("Phase 3 received: ", bytes_transferred);
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m_Decryption.Decrypt ((uint8_t *)&m_Phase3, sizeof(m_Phase3), (uint8_t *)&m_Phase3);
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m_RemoteRouterInfo.SetRouterIdentity (m_Phase3.ident);
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SignedData s;
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memcpy (s.x, m_Phase1.pubKey, 256);
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memcpy (s.y, m_Phase2.pubKey, 256);
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memcpy (s.ident, i2p::context.GetRouterInfo ().GetIdentHash (), 32);
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s.tsA = m_Phase3.timestamp;
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s.tsB = tsB;
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CryptoPP::DSA::PublicKey pubKey;
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pubKey.Initialize (dsap, dsaq, dsag, CryptoPP::Integer (m_RemoteRouterInfo.GetRouterIdentity ().signingKey, 128));
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CryptoPP::DSA::Verifier verifier (pubKey);
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if (!verifier.VerifyMessage ((uint8_t *)&s, sizeof(s), m_Phase3.signature, 40))
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{
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LogPrint ("signature verification failed");
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Terminate ();
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return;
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}
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SendPhase4 (tsB);
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}
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}
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void NTCPSession::SendPhase4 (uint32_t tsB)
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{
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SignedData s;
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memcpy (s.x, m_Phase1.pubKey, 256);
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memcpy (s.y, m_Phase2.pubKey, 256);
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memcpy (s.ident, m_RemoteRouterInfo.GetIdentHash (), 32);
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s.tsA = m_Phase3.timestamp;
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s.tsB = tsB;
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i2p::context.Sign ((uint8_t *)&s, sizeof (s), m_Phase4.signature);
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m_Encryption.Encrypt ((uint8_t *)&m_Phase4, sizeof(m_Phase4), (uint8_t *)&m_Phase4);
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boost::asio::async_write (m_Socket, boost::asio::buffer (&m_Phase4, sizeof (m_Phase4)), boost::asio::transfer_all (),
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boost::bind(&NTCPSession::HandlePhase4Sent, this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred));
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}
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void NTCPSession::HandlePhase4Sent (const boost::system::error_code& ecode, std::size_t bytes_transferred)
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{
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if (ecode)
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{
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LogPrint ("Couldn't send Phase 4 message: ", ecode.message ());
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Terminate ();
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}
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else
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{
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LogPrint ("Phase 4 sent: ", bytes_transferred);
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Connected ();
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m_ReceiveBufferOffset = 0;
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m_NextMessage = nullptr;
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Receive ();
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}
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}
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void NTCPSession::HandlePhase4Received (const boost::system::error_code& ecode, std::size_t bytes_transferred, uint32_t tsA)
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{
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if (ecode)
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{
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LogPrint ("Phase 4 read error: ", ecode.message ());
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GetRemoteRouterInfo ().SetUnreachable (true); // this router doesn't like us
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Terminate ();
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}
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else
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{
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LogPrint ("Phase 4 received: ", bytes_transferred);
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m_Decryption.Decrypt((uint8_t *)&m_Phase4, sizeof(m_Phase4), (uint8_t *)&m_Phase4);
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// verify signature
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SignedData s;
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memcpy (s.x, m_Phase1.pubKey, 256);
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memcpy (s.y, m_Phase2.pubKey, 256);
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memcpy (s.ident, i2p::context.GetRouterInfo ().GetIdentHash (), 32);
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s.tsA = tsA;
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s.tsB = m_Phase2.encrypted.timestamp;
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CryptoPP::DSA::PublicKey pubKey;
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pubKey.Initialize (dsap, dsaq, dsag, CryptoPP::Integer (m_RemoteRouterInfo.GetRouterIdentity ().signingKey, 128));
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CryptoPP::DSA::Verifier verifier (pubKey);
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if (!verifier.VerifyMessage ((uint8_t *)&s, sizeof(s), m_Phase4.signature, 40))
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{
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LogPrint ("signature verification failed");
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Terminate ();
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return;
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}
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Connected ();
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m_ReceiveBufferOffset = 0;
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m_NextMessage = nullptr;
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Receive ();
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}
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}
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void NTCPSession::Receive ()
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{
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m_Socket.async_read_some (boost::asio::buffer(m_ReceiveBuffer + m_ReceiveBufferOffset, NTCP_MAX_MESSAGE_SIZE*2 -m_ReceiveBufferOffset),
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boost::bind(&NTCPSession::HandleReceived, this,
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boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred));
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}
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void NTCPSession::HandleReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred)
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{
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if (ecode)
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{
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LogPrint ("Read error: ", ecode.message ());
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Terminate ();
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}
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else
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{
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m_NumReceivedBytes += bytes_transferred;
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m_ReceiveBufferOffset += bytes_transferred;
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if (m_ReceiveBufferOffset >= 16)
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{
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uint8_t * nextBlock = m_ReceiveBuffer;
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while (m_ReceiveBufferOffset >= 16)
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{
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DecryptNextBlock (nextBlock); // 16 bytes
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nextBlock += 16;
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m_ReceiveBufferOffset -= 16;
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}
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if (m_ReceiveBufferOffset > 0)
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memcpy (m_ReceiveBuffer, nextBlock, m_ReceiveBufferOffset);
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}
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ScheduleTermination (); // reset termination timer
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Receive ();
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}
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}
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void NTCPSession::DecryptNextBlock (const uint8_t * encrypted) // 16 bytes
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{
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if (!m_NextMessage) // new message, header expected
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{
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m_NextMessage = i2p::NewI2NPMessage ();
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m_NextMessageOffset = 0;
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m_Decryption.Decrypt (encrypted, m_NextMessage->buf);
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uint16_t dataSize = be16toh (*(uint16_t *)m_NextMessage->buf);
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if (dataSize)
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{
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// new message
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m_NextMessageOffset += 16;
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m_NextMessage->offset = 2; // size field
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m_NextMessage->len = dataSize + 2;
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}
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else
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{
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// timestamp
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LogPrint ("Timestamp");
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i2p::DeleteI2NPMessage (m_NextMessage);
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m_NextMessage = nullptr;
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return;
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}
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}
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else // message continues
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{
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m_Decryption.Decrypt (encrypted, m_NextMessage->buf + m_NextMessageOffset);
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m_NextMessageOffset += 16;
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}
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if (m_NextMessageOffset >= m_NextMessage->len + 4) // +checksum
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{
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// we have a complete I2NP message
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i2p::HandleI2NPMessage (m_NextMessage);
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m_NextMessage = nullptr;
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}
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}
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void NTCPSession::Send (i2p::I2NPMessage * msg)
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{
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uint8_t * sendBuffer;
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int len;
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if (msg)
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{
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// regular I2NP
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if (msg->offset < 2)
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{
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LogPrint ("Malformed I2NP message");
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i2p::DeleteI2NPMessage (msg);
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}
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sendBuffer = msg->GetBuffer () - 2;
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len = msg->GetLength ();
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*((uint16_t *)sendBuffer) = htobe16 (len);
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}
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else
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{
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// prepare timestamp
|
|
sendBuffer = m_TimeSyncBuffer;
|
|
len = 4;
|
|
*((uint16_t *)sendBuffer) = 0;
|
|
*((uint32_t *)(sendBuffer + 2)) = htobe32 (time (0));
|
|
}
|
|
int rem = (len + 6) & 0x0F; // %16
|
|
int padding = 0;
|
|
if (rem > 0) padding = 16 - rem;
|
|
// TODO: fill padding
|
|
m_Adler.CalculateDigest (sendBuffer + len + 2 + padding, sendBuffer, len + 2+ padding);
|
|
|
|
int l = len + padding + 6;
|
|
m_Encryption.Encrypt(sendBuffer, l, sendBuffer);
|
|
|
|
boost::asio::async_write (m_Socket, boost::asio::buffer (sendBuffer, l), boost::asio::transfer_all (),
|
|
boost::bind(&NTCPSession::HandleSent, this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred, msg));
|
|
}
|
|
|
|
void NTCPSession::HandleSent (const boost::system::error_code& ecode, std::size_t bytes_transferred, i2p::I2NPMessage * msg)
|
|
{
|
|
if (msg)
|
|
i2p::DeleteI2NPMessage (msg);
|
|
if (ecode)
|
|
{
|
|
LogPrint ("Couldn't send msg: ", ecode.message ());
|
|
// we shouldn't call Terminate () here, because HandleReceive takes care
|
|
// TODO: 'delete this' statement in Terminate () must be eliminated later
|
|
// Terminate ();
|
|
}
|
|
else
|
|
{
|
|
m_NumSentBytes += bytes_transferred;
|
|
ScheduleTermination (); // reset termination timer
|
|
}
|
|
}
|
|
|
|
void NTCPSession::SendTimeSyncMessage ()
|
|
{
|
|
Send (nullptr);
|
|
}
|
|
|
|
void NTCPSession::SendI2NPMessage (I2NPMessage * msg)
|
|
{
|
|
if (msg)
|
|
{
|
|
if (m_IsEstablished)
|
|
Send (msg);
|
|
else
|
|
m_DelayedMessages.push_back (msg);
|
|
}
|
|
}
|
|
|
|
void NTCPSession::ScheduleTermination ()
|
|
{
|
|
m_TerminationTimer.cancel ();
|
|
m_TerminationTimer.expires_from_now (boost::posix_time::seconds(NTCP_TERMINATION_TIMEOUT));
|
|
m_TerminationTimer.async_wait (boost::bind (&NTCPSession::HandleTerminationTimer,
|
|
this, boost::asio::placeholders::error));
|
|
}
|
|
|
|
void NTCPSession::HandleTerminationTimer (const boost::system::error_code& ecode)
|
|
{
|
|
if (ecode != boost::asio::error::operation_aborted)
|
|
{
|
|
LogPrint ("No activity fo ", NTCP_TERMINATION_TIMEOUT, " seconds");
|
|
m_Socket.close ();
|
|
}
|
|
}
|
|
|
|
|
|
NTCPClient::NTCPClient (boost::asio::io_service& service, const boost::asio::ip::address& address,
|
|
int port, i2p::data::RouterInfo& in_RouterInfo):
|
|
NTCPSession (service, in_RouterInfo),
|
|
m_Endpoint (address, port)
|
|
{
|
|
Connect ();
|
|
}
|
|
|
|
void NTCPClient::Connect ()
|
|
{
|
|
LogPrint ("Connecting to ", m_Endpoint.address ().to_string (),":", m_Endpoint.port ());
|
|
GetSocket ().async_connect (m_Endpoint, boost::bind (&NTCPClient::HandleConnect,
|
|
this, boost::asio::placeholders::error));
|
|
}
|
|
|
|
void NTCPClient::HandleConnect (const boost::system::error_code& ecode)
|
|
{
|
|
if (ecode)
|
|
{
|
|
LogPrint ("Connect error: ", ecode.message ());
|
|
GetRemoteRouterInfo ().SetUnreachable (true);
|
|
Terminate ();
|
|
}
|
|
else
|
|
{
|
|
LogPrint ("Connected");
|
|
ClientLogin ();
|
|
}
|
|
}
|
|
|
|
void NTCPServerConnection::Connected ()
|
|
{
|
|
LogPrint ("NTCP server session connected");
|
|
SetIsEstablished (true);
|
|
i2p::transports.AddNTCPSession (this);
|
|
|
|
SendTimeSyncMessage ();
|
|
SendI2NPMessage (CreateDatabaseStoreMsg ()); // we tell immediately who we are
|
|
}
|
|
}
|
|
}
|