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send SessionRequest message

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orignal 2018-06-06 15:38:18 -04:00
parent 4f23d7b7df
commit 5cb81f8532
2 changed files with 79 additions and 10 deletions
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60
libi2pd/NTCP2.cpp
View File

@ -1,6 +1,9 @@
#include <openssl/rand.h>
#include <openssl/sha.h>
#include <openssl/hmac.h>
#include <stdlib.h>
#include "Log.h"
#include "I2PEndian.h"
#include "Crypto.h"
#include "Ed25519.h"
#include "ChaCha20.h"
@ -11,13 +14,23 @@ namespace i2p
{
namespace transport
{
NTCP2Session::NTCP2Session (std::shared_ptr<const i2p::data::RouterInfo> in_RemoteRouter):
TransportSession (in_RemoteRouter, 30)
NTCP2Session::NTCP2Session (NTCP2Server& server, std::shared_ptr<const i2p::data::RouterInfo> in_RemoteRouter):
TransportSession (in_RemoteRouter, 30),
m_Server (server), m_Socket (m_Server.GetService ()), m_SessionRequestBuffer (nullptr)
{
auto addr = in_RemoteRouter->GetNTCPAddress ();
if (addr->ntcp2)
{
memcpy (m_RemoteStaticKey, addr->ntcp2->staticKey, 32);
memcpy (m_RemoteIV, addr->ntcp2->iv, 16);
}
else
LogPrint (eLogWarning, "NTCP2: Missing NTCP2 parameters");
}
NTCP2Session::~NTCP2Session ()
{
delete[] m_SessionRequestBuffer;
}
bool NTCP2Session::KeyDerivationFunction (const uint8_t * rs, const uint8_t * pub, uint8_t * derived)
@ -60,24 +73,55 @@ namespace transport
BN_CTX_free (ctx);
}
void NTCP2Session::SendSessionRequest (const uint8_t * iv, const uint8_t * rs)
void NTCP2Session::SendSessionRequest ()
{
i2p::crypto::AESAlignedBuffer<32> x;
CreateEphemeralKey (x);
// encrypt X
i2p::crypto::CBCEncryption encryption;
encryption.SetKey (GetRemoteIdentity ()->GetIdentHash ());
encryption.SetIV (iv);
encryption.SetIV (m_RemoteIV);
encryption.Encrypt (2, x.GetChipherBlock (), x.GetChipherBlock ());
// encryption key for next block
uint8_t key[32];
KeyDerivationFunction (rs, x, key);
// options
uint8_t options[32];
// TODO: fill 16 bytes options
KeyDerivationFunction (m_RemoteStaticKey, x, key);
// fill options
uint8_t options[32]; // actual options size is 16 bytes
memset (options, 0, 16);
htobe16buf (options, 2); // ver
auto paddingLength = rand () % (287 - 64); // message length doesn't exceed 287 bytes
htobe16buf (options + 2, paddingLength); // padLen
htobe16buf (options + 4, 0); // m3p2Len TODO:
// 2 bytes reserved
htobe32buf (options + 8, i2p::util::GetSecondsSinceEpoch ()); // tsA
// 4 bytes reserved
// sign and encrypt options
i2p::crypto::Poly1305HMAC (((uint32_t *)options) + 4, (uint32_t *)key, options, 16); // calculate MAC first
i2p::crypto::chacha20 (options, 16, 0, key); // then encrypt
// create buffer
m_SessionRequestBuffer = new uint8_t[paddingLength + 64];
memcpy (m_SessionRequestBuffer, x, 32);
memcpy (m_SessionRequestBuffer + 32, options, 32);
RAND_bytes (m_SessionRequestBuffer + 64, paddingLength);
// send message
boost::asio::async_write (m_Socket, boost::asio::buffer (m_SessionRequestBuffer, paddingLength + 64), boost::asio::transfer_all (),
std::bind(&NTCP2Session::HandleSessionRequestSent, shared_from_this (), std::placeholders::_1, std::placeholders::_2));
}
void NTCP2Session::HandleSessionRequestSent (const boost::system::error_code& ecode, std::size_t bytes_transferred)
{
(void) bytes_transferred;
delete[] m_SessionRequestBuffer; m_SessionRequestBuffer = nullptr;
if (ecode)
{
LogPrint (eLogInfo, "NTCP2: couldn't send SessionRequest message: ", ecode.message ());
}
}
void NTCP2Session::ClientLogin ()
{
SendSessionRequest ();
}
}
}

29
libi2pd/NTCP2.h
View File

@ -3,6 +3,7 @@
#include <inttypes.h>
#include <memory>
#include <boost/asio.hpp>
#include "RouterInfo.h"
#include "TransportSession.h"
@ -10,22 +11,46 @@ namespace i2p
{
namespace transport
{
class NTCP2Server;
class NTCP2Session: public TransportSession, public std::enable_shared_from_this<NTCP2Session>
{
public:
NTCP2Session (std::shared_ptr<const i2p::data::RouterInfo> in_RemoteRouter = nullptr); // TODO
NTCP2Session (NTCP2Server& server, std::shared_ptr<const i2p::data::RouterInfo> in_RemoteRouter = nullptr); // TODO
~NTCP2Session ();
boost::asio::ip::tcp::socket& GetSocket () { return m_Socket; };
void ClientLogin (); // Alice
private:
bool KeyDerivationFunction (const uint8_t * rs, const uint8_t * pub, uint8_t * derived);
void CreateEphemeralKey (uint8_t * pub);
void SendSessionRequest (const uint8_t * iv, const uint8_t * rs);
void SendSessionRequest ();
void HandleSessionRequestSent (const boost::system::error_code& ecode, std::size_t bytes_transferred);
private:
NTCP2Server& m_Server;
boost::asio::ip::tcp::socket m_Socket;
uint8_t m_ExpandedPrivateKey[64]; // x25519 ephemeral key
uint8_t m_RemoteStaticKey[32], m_RemoteIV[16];
uint8_t * m_SessionRequestBuffer;
};
class NTCP2Server
{
public:
NTCP2Server () {};
~NTCP2Server () {} ;
boost::asio::io_service& GetService () { return m_Service; };
private:
boost::asio::io_service m_Service;
};
}
}