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i2pd/libi2pd/NTCP2.cpp

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/*
* Copyright (c) 2013-2020, The PurpleI2P Project
*
* This file is part of Purple i2pd project and licensed under BSD3
*
* See full license text in LICENSE file at top of project tree
*
*/
#include <openssl/rand.h>
#include <openssl/sha.h>
#include <openssl/hmac.h>
#include <stdlib.h>
#include <vector>
#include "Log.h"
#include "I2PEndian.h"
#include "Crypto.h"
#include "Siphash.h"
#include "RouterContext.h"
#include "Transports.h"
#include "NetDb.hpp"
#include "NTCP2.h"
#include "HTTP.h"
#include "util.h"
namespace i2p
{
namespace transport
{
NTCP2Establisher::NTCP2Establisher ():
m_SessionRequestBuffer (nullptr), m_SessionCreatedBuffer (nullptr), m_SessionConfirmedBuffer (nullptr)
{
}
NTCP2Establisher::~NTCP2Establisher ()
{
delete[] m_SessionRequestBuffer;
delete[] m_SessionCreatedBuffer;
delete[] m_SessionConfirmedBuffer;
}
void NTCP2Establisher::KeyDerivationFunction1 (const uint8_t * pub, i2p::crypto::X25519Keys& priv, const uint8_t * rs, const uint8_t * epub)
{
i2p::crypto::InitNoiseXKState (*this, rs);
// h = SHA256(h || epub)
MixHash (epub, 32);
// x25519 between pub and priv
uint8_t inputKeyMaterial[32];
priv.Agree (pub, inputKeyMaterial);
MixKey (inputKeyMaterial);
}
void NTCP2Establisher::KDF1Alice ()
{
KeyDerivationFunction1 (m_RemoteStaticKey, *m_EphemeralKeys, m_RemoteStaticKey, GetPub ());
}
void NTCP2Establisher::KDF1Bob ()
{
KeyDerivationFunction1 (GetRemotePub (), i2p::context.GetStaticKeys (), i2p::context.GetNTCP2StaticPublicKey (), GetRemotePub ());
}
void NTCP2Establisher::KeyDerivationFunction2 (const uint8_t * sessionRequest, size_t sessionRequestLen, const uint8_t * epub)
{
MixHash (sessionRequest + 32, 32); // encrypted payload
int paddingLength = sessionRequestLen - 64;
if (paddingLength > 0)
MixHash (sessionRequest + 64, paddingLength);
MixHash (epub, 32);
// x25519 between remote pub and ephemaral priv
uint8_t inputKeyMaterial[32];
m_EphemeralKeys->Agree (GetRemotePub (), inputKeyMaterial);
MixKey (inputKeyMaterial);
}
void NTCP2Establisher::KDF2Alice ()
{
KeyDerivationFunction2 (m_SessionRequestBuffer, m_SessionRequestBufferLen, GetRemotePub ());
}
void NTCP2Establisher::KDF2Bob ()
{
KeyDerivationFunction2 (m_SessionRequestBuffer, m_SessionRequestBufferLen, GetPub ());
}
void NTCP2Establisher::KDF3Alice ()
{
uint8_t inputKeyMaterial[32];
i2p::context.GetStaticKeys ().Agree (GetRemotePub (), inputKeyMaterial);
MixKey (inputKeyMaterial);
}
void NTCP2Establisher::KDF3Bob ()
{
uint8_t inputKeyMaterial[32];
m_EphemeralKeys->Agree (m_RemoteStaticKey, inputKeyMaterial);
MixKey (inputKeyMaterial);
}
void NTCP2Establisher::CreateEphemeralKey ()
{
m_EphemeralKeys = i2p::transport::transports.GetNextX25519KeysPair ();
}
void NTCP2Establisher::CreateSessionRequestMessage ()
{
// create buffer and fill padding
auto paddingLength = rand () % (287 - 64); // message length doesn't exceed 287 bytes
m_SessionRequestBufferLen = paddingLength + 64;
m_SessionRequestBuffer = new uint8_t[m_SessionRequestBufferLen];
RAND_bytes (m_SessionRequestBuffer + 64, paddingLength);
// encrypt X
i2p::crypto::CBCEncryption encryption;
encryption.SetKey (m_RemoteIdentHash);
encryption.SetIV (m_IV);
encryption.Encrypt (GetPub (), 32, m_SessionRequestBuffer); // X
encryption.GetIV (m_IV); // save IV for SessionCreated
// encryption key for next block
KDF1Alice ();
// fill options
uint8_t options[32]; // actual options size is 16 bytes
memset (options, 0, 16);
options[0] = i2p::context.GetNetID (); // network ID
options[1] = 2; // ver
htobe16buf (options + 2, paddingLength); // padLen
// m3p2Len
auto bufLen = i2p::context.GetRouterInfo ().GetBufferLen ();
m3p2Len = bufLen + 4 + 16; // (RI header + RI + MAC for now) TODO: implement options
htobe16buf (options + 4, m3p2Len);
// fill m3p2 payload (RouterInfo block)
m_SessionConfirmedBuffer = new uint8_t[m3p2Len + 48]; // m3p1 is 48 bytes
uint8_t * m3p2 = m_SessionConfirmedBuffer + 48;
m3p2[0] = eNTCP2BlkRouterInfo; // block
htobe16buf (m3p2 + 1, bufLen + 1); // flag + RI
m3p2[3] = 0; // flag
memcpy (m3p2 + 4, i2p::context.GetRouterInfo ().GetBuffer (), bufLen); // TODO: own RI should be protected by mutex
// 2 bytes reserved
htobe32buf (options + 8, i2p::util::GetSecondsSinceEpoch ()); // tsA
// 4 bytes reserved
// sign and encrypt options, use m_H as AD
uint8_t nonce[12];
memset (nonce, 0, 12); // set nonce to zero
i2p::crypto::AEADChaCha20Poly1305 (options, 16, GetH (), 32, GetK (), nonce, m_SessionRequestBuffer + 32, 32, true); // encrypt
}
void NTCP2Establisher::CreateSessionCreatedMessage ()
{
auto paddingLen = rand () % (287 - 64);
m_SessionCreatedBufferLen = paddingLen + 64;
m_SessionCreatedBuffer = new uint8_t[m_SessionCreatedBufferLen];
RAND_bytes (m_SessionCreatedBuffer + 64, paddingLen);
// encrypt Y
i2p::crypto::CBCEncryption encryption;
encryption.SetKey (i2p::context.GetIdentHash ());
encryption.SetIV (m_IV);
encryption.Encrypt (GetPub (), 32, m_SessionCreatedBuffer); // Y
// encryption key for next block (m_K)
KDF2Bob ();
uint8_t options[16];
memset (options, 0, 16);
htobe16buf (options + 2, paddingLen); // padLen
htobe32buf (options + 8, i2p::util::GetSecondsSinceEpoch ()); // tsB
// sign and encrypt options, use m_H as AD
uint8_t nonce[12];
memset (nonce, 0, 12); // set nonce to zero
i2p::crypto::AEADChaCha20Poly1305 (options, 16, GetH (), 32, GetK (), nonce, m_SessionCreatedBuffer + 32, 32, true); // encrypt
}
void NTCP2Establisher::CreateSessionConfirmedMessagePart1 (const uint8_t * nonce)
{
// update AD
MixHash (m_SessionCreatedBuffer + 32, 32); // encrypted payload
int paddingLength = m_SessionCreatedBufferLen - 64;
if (paddingLength > 0)
MixHash (m_SessionCreatedBuffer + 64, paddingLength);
// part1 48 bytes
i2p::crypto::AEADChaCha20Poly1305 (i2p::context.GetNTCP2StaticPublicKey (), 32, GetH (), 32, GetK (), nonce, m_SessionConfirmedBuffer, 48, true); // encrypt
}
void NTCP2Establisher::CreateSessionConfirmedMessagePart2 (const uint8_t * nonce)
{
// part 2
// update AD again
MixHash (m_SessionConfirmedBuffer, 48);
// encrypt m3p2, it must be filled in SessionRequest
KDF3Alice ();
uint8_t * m3p2 = m_SessionConfirmedBuffer + 48;
i2p::crypto::AEADChaCha20Poly1305 (m3p2, m3p2Len - 16, GetH (), 32, GetK (), nonce, m3p2, m3p2Len, true); // encrypt
// update h again
MixHash (m3p2, m3p2Len); //h = SHA256(h || ciphertext)
}
bool NTCP2Establisher::ProcessSessionRequestMessage (uint16_t& paddingLen)
{
// decrypt X
i2p::crypto::CBCDecryption decryption;
decryption.SetKey (i2p::context.GetIdentHash ());
decryption.SetIV (i2p::context.GetNTCP2IV ());
decryption.Decrypt (m_SessionRequestBuffer, 32, GetRemotePub ());
decryption.GetIV (m_IV); // save IV for SessionCreated
// decryption key for next block
KDF1Bob ();
// verify MAC and decrypt options block (32 bytes), use m_H as AD
uint8_t nonce[12], options[16];
memset (nonce, 0, 12); // set nonce to zero
if (i2p::crypto::AEADChaCha20Poly1305 (m_SessionRequestBuffer + 32, 16, GetH (), 32, GetK (), nonce, options, 16, false)) // decrypt
{
// options
if (options[0] && options[0] != i2p::context.GetNetID ())
{
LogPrint (eLogWarning, "NTCP2: SessionRequest networkID ", (int)options[0], " mismatch. Expected ", i2p::context.GetNetID ());
return false;
}
if (options[1] == 2) // ver is always 2
{
paddingLen = bufbe16toh (options + 2);
m_SessionRequestBufferLen = paddingLen + 64;
m3p2Len = bufbe16toh (options + 4);
if (m3p2Len < 16)
{
LogPrint (eLogWarning, "NTCP2: SessionRequest m3p2len=", m3p2Len, " is too short");
return false;
}
// check timestamp
auto ts = i2p::util::GetSecondsSinceEpoch ();
uint32_t tsA = bufbe32toh (options + 8);
if (tsA < ts - NTCP2_CLOCK_SKEW || tsA > ts + NTCP2_CLOCK_SKEW)
{
LogPrint (eLogWarning, "NTCP2: SessionRequest time difference ", (int)(ts - tsA), " exceeds clock skew");
return false;
}
}
else
{
LogPrint (eLogWarning, "NTCP2: SessionRequest version mismatch ", (int)options[1]);
return false;
}
}
else
{
LogPrint (eLogWarning, "NTCP2: SessionRequest AEAD verification failed ");
return false;
}
return true;
}
bool NTCP2Establisher::ProcessSessionCreatedMessage (uint16_t& paddingLen)
{
m_SessionCreatedBufferLen = 64;
// decrypt Y
i2p::crypto::CBCDecryption decryption;
decryption.SetKey (m_RemoteIdentHash);
decryption.SetIV (m_IV);
decryption.Decrypt (m_SessionCreatedBuffer, 32, GetRemotePub ());
// decryption key for next block (m_K)
KDF2Alice ();
// decrypt and verify MAC
uint8_t payload[16];
uint8_t nonce[12];
memset (nonce, 0, 12); // set nonce to zero
if (i2p::crypto::AEADChaCha20Poly1305 (m_SessionCreatedBuffer + 32, 16, GetH (), 32, GetK (), nonce, payload, 16, false)) // decrypt
{
// options
paddingLen = bufbe16toh(payload + 2);
// check timestamp
auto ts = i2p::util::GetSecondsSinceEpoch ();
uint32_t tsB = bufbe32toh (payload + 8);
if (tsB < ts - NTCP2_CLOCK_SKEW || tsB > ts + NTCP2_CLOCK_SKEW)
{
LogPrint (eLogWarning, "NTCP2: SessionCreated time difference ", (int)(ts - tsB), " exceeds clock skew");
return false;
}
}
else
{
LogPrint (eLogWarning, "NTCP2: SessionCreated AEAD verification failed ");
return false;
}
return true;
}
bool NTCP2Establisher::ProcessSessionConfirmedMessagePart1 (const uint8_t * nonce)
{
// update AD
MixHash (m_SessionCreatedBuffer + 32, 32); // encrypted payload
int paddingLength = m_SessionCreatedBufferLen - 64;
if (paddingLength > 0)
MixHash (m_SessionCreatedBuffer + 64, paddingLength);
if (!i2p::crypto::AEADChaCha20Poly1305 (m_SessionConfirmedBuffer, 32, GetH (), 32, GetK (), nonce, m_RemoteStaticKey, 32, false)) // decrypt S
{
LogPrint (eLogWarning, "NTCP2: SessionConfirmed Part1 AEAD verification failed ");
return false;
}
return true;
}
bool NTCP2Establisher::ProcessSessionConfirmedMessagePart2 (const uint8_t * nonce, uint8_t * m3p2Buf)
{
// update AD again
MixHash (m_SessionConfirmedBuffer, 48);
KDF3Bob ();
if (i2p::crypto::AEADChaCha20Poly1305 (m_SessionConfirmedBuffer + 48, m3p2Len - 16, GetH (), 32, GetK (), nonce, m3p2Buf, m3p2Len - 16, false)) // decrypt
// caclulate new h again for KDF data
MixHash (m_SessionConfirmedBuffer + 48, m3p2Len); // h = SHA256(h || ciphertext)
else
{
LogPrint (eLogWarning, "NTCP2: SessionConfirmed Part2 AEAD verification failed ");
return false;
}
return true;
}
NTCP2Session::NTCP2Session (NTCP2Server& server, std::shared_ptr<const i2p::data::RouterInfo> in_RemoteRouter,
std::shared_ptr<const i2p::data::RouterInfo::Address> addr):
TransportSession (in_RemoteRouter, NTCP2_ESTABLISH_TIMEOUT),
m_Server (server), m_Socket (m_Server.GetService ()),
m_IsEstablished (false), m_IsTerminated (false),
m_Establisher (new NTCP2Establisher),
m_SendSipKey (nullptr), m_ReceiveSipKey (nullptr),
#if OPENSSL_SIPHASH
m_SendMDCtx(nullptr), m_ReceiveMDCtx (nullptr),
#endif
m_NextReceivedLen (0), m_NextReceivedBuffer (nullptr), m_NextSendBuffer (nullptr),
m_ReceiveSequenceNumber (0), m_SendSequenceNumber (0), m_IsSending (false)
{
if (in_RemoteRouter) // Alice
{
m_Establisher->m_RemoteIdentHash = GetRemoteIdentity ()->GetIdentHash ();
if (addr)
{
memcpy (m_Establisher->m_RemoteStaticKey, addr->ntcp2->staticKey, 32);
memcpy (m_Establisher->m_IV, addr->ntcp2->iv, 16);
m_RemoteEndpoint = boost::asio::ip::tcp::endpoint (addr->host, addr->port);
}
else
LogPrint (eLogWarning, "NTCP2: Missing NTCP2 address");
}
m_NextRouterInfoResendTime = i2p::util::GetSecondsSinceEpoch () + NTCP2_ROUTERINFO_RESEND_INTERVAL +
rand ()%NTCP2_ROUTERINFO_RESEND_INTERVAL_THRESHOLD;
}
NTCP2Session::~NTCP2Session ()
{
delete[] m_NextReceivedBuffer;
delete[] m_NextSendBuffer;
#if OPENSSL_SIPHASH
if (m_SendSipKey) EVP_PKEY_free (m_SendSipKey);
if (m_ReceiveSipKey) EVP_PKEY_free (m_ReceiveSipKey);
if (m_SendMDCtx) EVP_MD_CTX_destroy (m_SendMDCtx);
if (m_ReceiveMDCtx) EVP_MD_CTX_destroy (m_ReceiveMDCtx);
#endif
}
void NTCP2Session::Terminate ()
{
if (!m_IsTerminated)
{
m_IsTerminated = true;
m_IsEstablished = false;
boost::system::error_code ec;
m_Socket.shutdown(boost::asio::ip::tcp::socket::shutdown_both, ec);
if (ec)
LogPrint (eLogDebug, "NTCP2: Couldn't shutdown socket: ", ec.message ());
m_Socket.close ();
transports.PeerDisconnected (shared_from_this ());
m_Server.RemoveNTCP2Session (shared_from_this ());
m_SendQueue.clear ();
LogPrint (eLogDebug, "NTCP2: session terminated");
}
}
void NTCP2Session::TerminateByTimeout ()
{
SendTerminationAndTerminate (eNTCP2IdleTimeout);
}
void NTCP2Session::Done ()
{
m_Server.GetService ().post (std::bind (&NTCP2Session::Terminate, shared_from_this ()));
}
void NTCP2Session::Established ()
{
m_IsEstablished = true;
m_Establisher.reset (nullptr);
SetTerminationTimeout (NTCP2_TERMINATION_TIMEOUT);
transports.PeerConnected (shared_from_this ());
}
void NTCP2Session::CreateNonce (uint64_t seqn, uint8_t * nonce)
{
memset (nonce, 0, 4);
htole64buf (nonce + 4, seqn);
}
void NTCP2Session::KeyDerivationFunctionDataPhase ()
{
uint8_t k[64];
i2p::crypto::HKDF (m_Establisher->GetCK (), nullptr, 0, "", k); // k_ab, k_ba = HKDF(ck, zerolen)
memcpy (m_Kab, k, 32); memcpy (m_Kba, k + 32, 32);
uint8_t master[32];
i2p::crypto::HKDF (m_Establisher->GetCK (), nullptr, 0, "ask", master, 32); // ask_master = HKDF(ck, zerolen, info="ask")
uint8_t h[39];
memcpy (h, m_Establisher->GetH (), 32);
memcpy (h + 32, "siphash", 7);
i2p::crypto::HKDF (master, h, 39, "", master, 32); // sip_master = HKDF(ask_master, h || "siphash")
i2p::crypto::HKDF (master, nullptr, 0, "", k); // sipkeys_ab, sipkeys_ba = HKDF(sip_master, zerolen)
memcpy (m_Sipkeysab, k, 32); memcpy (m_Sipkeysba, k + 32, 32);
}
void NTCP2Session::SendSessionRequest ()
{
m_Establisher->CreateSessionRequestMessage ();
// send message
boost::asio::async_write (m_Socket, boost::asio::buffer (m_Establisher->m_SessionRequestBuffer, m_Establisher->m_SessionRequestBufferLen), 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;
if (ecode)
{
LogPrint (eLogWarning, "NTCP2: couldn't send SessionRequest message: ", ecode.message ());
Terminate ();
}
else
{
m_Establisher->m_SessionCreatedBuffer = new uint8_t[287]; // TODO: determine actual max size
// we receive first 64 bytes (32 Y, and 32 ChaCha/Poly frame) first
boost::asio::async_read (m_Socket, boost::asio::buffer(m_Establisher->m_SessionCreatedBuffer, 64), boost::asio::transfer_all (),
std::bind(&NTCP2Session::HandleSessionCreatedReceived, shared_from_this (), std::placeholders::_1, std::placeholders::_2));
}
}
void NTCP2Session::HandleSessionRequestReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred)
{
(void) bytes_transferred;
if (ecode)
{
LogPrint (eLogWarning, "NTCP2: SessionRequest read error: ", ecode.message ());
Terminate ();
}
else
{
LogPrint (eLogDebug, "NTCP2: SessionRequest received ", bytes_transferred);
uint16_t paddingLen = 0;
if (m_Establisher->ProcessSessionRequestMessage (paddingLen))
{
if (paddingLen > 0)
{
if (paddingLen <= 287 - 64) // session request is 287 bytes max
{
boost::asio::async_read (m_Socket, boost::asio::buffer(m_Establisher->m_SessionRequestBuffer + 64, paddingLen), boost::asio::transfer_all (),
std::bind(&NTCP2Session::HandleSessionRequestPaddingReceived, shared_from_this (), std::placeholders::_1, std::placeholders::_2));
}
else
{
LogPrint (eLogWarning, "NTCP2: SessionRequest padding length ", (int)paddingLen, " is too long");
Terminate ();
}
}
else
SendSessionCreated ();
}
else
Terminate ();
}
}
void NTCP2Session::HandleSessionRequestPaddingReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred)
{
if (ecode)
{
LogPrint (eLogWarning, "NTCP2: SessionRequest padding read error: ", ecode.message ());
Terminate ();
}
else
SendSessionCreated ();
}
void NTCP2Session::SendSessionCreated ()
{
m_Establisher->CreateSessionCreatedMessage ();
// send message
boost::asio::async_write (m_Socket, boost::asio::buffer (m_Establisher->m_SessionCreatedBuffer, m_Establisher->m_SessionCreatedBufferLen), boost::asio::transfer_all (),
std::bind(&NTCP2Session::HandleSessionCreatedSent, shared_from_this (), std::placeholders::_1, std::placeholders::_2));
}
void NTCP2Session::HandleSessionCreatedReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred)
{
if (ecode)
{
LogPrint (eLogWarning, "NTCP2: SessionCreated read error: ", ecode.message ());
Terminate ();
}
else
{
LogPrint (eLogDebug, "NTCP2: SessionCreated received ", bytes_transferred);
uint16_t paddingLen = 0;
if (m_Establisher->ProcessSessionCreatedMessage (paddingLen))
{
if (paddingLen > 0)
{
if (paddingLen <= 287 - 64) // session created is 287 bytes max
{
boost::asio::async_read (m_Socket, boost::asio::buffer(m_Establisher->m_SessionCreatedBuffer + 64, paddingLen), boost::asio::transfer_all (),
std::bind(&NTCP2Session::HandleSessionCreatedPaddingReceived, shared_from_this (), std::placeholders::_1, std::placeholders::_2));
}
else
{
LogPrint (eLogWarning, "NTCP2: SessionCreated padding length ", (int)paddingLen, " is too long");
Terminate ();
}
}
else
SendSessionConfirmed ();
}
else
Terminate ();
}
}
void NTCP2Session::HandleSessionCreatedPaddingReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred)
{
if (ecode)
{
LogPrint (eLogWarning, "NTCP2: SessionCreated padding read error: ", ecode.message ());
Terminate ();
}
else
{
m_Establisher->m_SessionCreatedBufferLen += bytes_transferred;
SendSessionConfirmed ();
}
}
void NTCP2Session::SendSessionConfirmed ()
{
uint8_t nonce[12];
CreateNonce (1, nonce); // set nonce to 1
m_Establisher->CreateSessionConfirmedMessagePart1 (nonce);
memset (nonce, 0, 12); // set nonce back to 0
m_Establisher->CreateSessionConfirmedMessagePart2 (nonce);
// send message
boost::asio::async_write (m_Socket, boost::asio::buffer (m_Establisher->m_SessionConfirmedBuffer, m_Establisher->m3p2Len + 48), boost::asio::transfer_all (),
std::bind(&NTCP2Session::HandleSessionConfirmedSent, shared_from_this (), std::placeholders::_1, std::placeholders::_2));
}
void NTCP2Session::HandleSessionConfirmedSent (const boost::system::error_code& ecode, std::size_t bytes_transferred)
{
(void) bytes_transferred;
if (ecode)
{
LogPrint (eLogWarning, "NTCP2: couldn't send SessionConfirmed message: ", ecode.message ());
Terminate ();
}
else
{
LogPrint (eLogDebug, "NTCP2: SessionConfirmed sent");
KeyDerivationFunctionDataPhase ();
// Alice data phase keys
m_SendKey = m_Kab;
m_ReceiveKey = m_Kba;
SetSipKeys (m_Sipkeysab, m_Sipkeysba);
memcpy (m_ReceiveIV.buf, m_Sipkeysba + 16, 8);
memcpy (m_SendIV.buf, m_Sipkeysab + 16, 8);
Established ();
ReceiveLength ();
// TODO: remove
// m_SendQueue.push_back (CreateDeliveryStatusMsg (1));
// SendQueue ();
}
}
void NTCP2Session::HandleSessionCreatedSent (const boost::system::error_code& ecode, std::size_t bytes_transferred)
{
(void) bytes_transferred;
if (ecode)
{
LogPrint (eLogWarning, "NTCP2: couldn't send SessionCreated message: ", ecode.message ());
Terminate ();
}
else
{
LogPrint (eLogDebug, "NTCP2: SessionCreated sent");
m_Establisher->m_SessionConfirmedBuffer = new uint8_t[m_Establisher->m3p2Len + 48];
boost::asio::async_read (m_Socket, boost::asio::buffer(m_Establisher->m_SessionConfirmedBuffer, m_Establisher->m3p2Len + 48), boost::asio::transfer_all (),
std::bind(&NTCP2Session::HandleSessionConfirmedReceived , shared_from_this (), std::placeholders::_1, std::placeholders::_2));
}
}
void NTCP2Session::HandleSessionConfirmedReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred)
{
if (ecode)
{
LogPrint (eLogWarning, "NTCP2: SessionConfirmed read error: ", ecode.message ());
Terminate ();
}
else
{
LogPrint (eLogDebug, "NTCP2: SessionConfirmed received");
// part 1
uint8_t nonce[12];
CreateNonce (1, nonce);
if (m_Establisher->ProcessSessionConfirmedMessagePart1 (nonce))
{
// part 2
std::vector<uint8_t> buf(m_Establisher->m3p2Len - 16); // -MAC
memset (nonce, 0, 12); // set nonce to 0 again
if (m_Establisher->ProcessSessionConfirmedMessagePart2 (nonce, buf.data ()))
{
KeyDerivationFunctionDataPhase ();
// Bob data phase keys
m_SendKey = m_Kba;
m_ReceiveKey = m_Kab;
SetSipKeys (m_Sipkeysba, m_Sipkeysab);
memcpy (m_ReceiveIV.buf, m_Sipkeysab + 16, 8);
memcpy (m_SendIV.buf, m_Sipkeysba + 16, 8);
// payload
// process RI
if (buf[0] != eNTCP2BlkRouterInfo)
{
LogPrint (eLogWarning, "NTCP2: unexpected block ", (int)buf[0], " in SessionConfirmed");
Terminate ();
return;
}
auto size = bufbe16toh (buf.data () + 1);
if (size > buf.size () - 3)
{
LogPrint (eLogError, "NTCP2: Unexpected RouterInfo size ", size, " in SessionConfirmed");
Terminate ();
return;
}
// TODO: check flag
i2p::data::RouterInfo ri (buf.data () + 4, size - 1); // 1 byte block type + 2 bytes size + 1 byte flag
if (ri.IsUnreachable ())
{
LogPrint (eLogError, "NTCP2: Signature verification failed in SessionConfirmed");
SendTerminationAndTerminate (eNTCP2RouterInfoSignatureVerificationFail);
return;
}
if (i2p::util::GetMillisecondsSinceEpoch () > ri.GetTimestamp () + i2p::data::NETDB_MIN_EXPIRATION_TIMEOUT*1000LL) // 90 minutes
{
LogPrint (eLogError, "NTCP2: RouterInfo is too old in SessionConfirmed");
SendTerminationAndTerminate (eNTCP2Message3Error);
return;
}
auto addr = ri.GetNTCP2AddressWithStaticKey (m_Establisher->m_RemoteStaticKey);
if (!addr)
{
LogPrint (eLogError, "NTCP2: No NTCP2 address wth static key found in SessionConfirmed");
Terminate ();
return;
}
i2p::data::netdb.PostI2NPMsg (CreateI2NPMessage (eI2NPDummyMsg, buf.data () + 3, size)); // TODO: should insert ri and not parse it twice
// TODO: process options
// ready to communicate
auto existing = i2p::data::netdb.FindRouter (ri.GetRouterIdentity ()->GetIdentHash ()); // check if exists already
SetRemoteIdentity (existing ? existing->GetRouterIdentity () : ri.GetRouterIdentity ());
if (m_Server.AddNTCP2Session (shared_from_this (), true))
{
Established ();
ReceiveLength ();
}
else
Terminate ();
}
else
Terminate ();
}
else
Terminate ();
}
}
void NTCP2Session::SetSipKeys (const uint8_t * sendSipKey, const uint8_t * receiveSipKey)
{
#if OPENSSL_SIPHASH
m_SendSipKey = EVP_PKEY_new_raw_private_key (EVP_PKEY_SIPHASH, nullptr, sendSipKey, 16);
m_SendMDCtx = EVP_MD_CTX_create ();
EVP_PKEY_CTX *ctx = nullptr;
EVP_DigestSignInit (m_SendMDCtx, &ctx, nullptr, nullptr, m_SendSipKey);
EVP_PKEY_CTX_ctrl (ctx, -1, EVP_PKEY_OP_SIGNCTX, EVP_PKEY_CTRL_SET_DIGEST_SIZE, 8, nullptr);
m_ReceiveSipKey = EVP_PKEY_new_raw_private_key (EVP_PKEY_SIPHASH, nullptr, receiveSipKey, 16);
m_ReceiveMDCtx = EVP_MD_CTX_create ();
ctx = nullptr;
EVP_DigestSignInit (m_ReceiveMDCtx, &ctx, NULL, NULL, m_ReceiveSipKey);
EVP_PKEY_CTX_ctrl (ctx, -1, EVP_PKEY_OP_SIGNCTX, EVP_PKEY_CTRL_SET_DIGEST_SIZE, 8, nullptr);
#else
m_SendSipKey = sendSipKey;
m_ReceiveSipKey = receiveSipKey;
#endif
}
void NTCP2Session::ClientLogin ()
{
m_Establisher->CreateEphemeralKey ();
SendSessionRequest ();
}
void NTCP2Session::ServerLogin ()
{
m_Establisher->CreateEphemeralKey ();
m_Establisher->m_SessionRequestBuffer = new uint8_t[287]; // 287 bytes max for now
boost::asio::async_read (m_Socket, boost::asio::buffer(m_Establisher->m_SessionRequestBuffer, 64), boost::asio::transfer_all (),
std::bind(&NTCP2Session::HandleSessionRequestReceived, shared_from_this (),
std::placeholders::_1, std::placeholders::_2));
}
void NTCP2Session::ReceiveLength ()
{
if (IsTerminated ()) return;
#ifdef __linux__
const int one = 1;
setsockopt(m_Socket.native_handle(), IPPROTO_TCP, TCP_QUICKACK, &one, sizeof(one));
#endif
boost::asio::async_read (m_Socket, boost::asio::buffer(&m_NextReceivedLen, 2), boost::asio::transfer_all (),
std::bind(&NTCP2Session::HandleReceivedLength, shared_from_this (), std::placeholders::_1, std::placeholders::_2));
}
void NTCP2Session::HandleReceivedLength (const boost::system::error_code& ecode, std::size_t bytes_transferred)
{
if (ecode)
{
if (ecode != boost::asio::error::operation_aborted)
LogPrint (eLogWarning, "NTCP2: receive length read error: ", ecode.message ());
Terminate ();
}
else
{
#if OPENSSL_SIPHASH
EVP_DigestSignInit (m_ReceiveMDCtx, nullptr, nullptr, nullptr, nullptr);
EVP_DigestSignUpdate (m_ReceiveMDCtx, m_ReceiveIV.buf, 8);
size_t l = 8;
EVP_DigestSignFinal (m_ReceiveMDCtx, m_ReceiveIV.buf, &l);
#else
i2p::crypto::Siphash<8> (m_ReceiveIV.buf, m_ReceiveIV.buf, 8, m_ReceiveSipKey);
#endif
// m_NextReceivedLen comes from the network in BigEndian
m_NextReceivedLen = be16toh (m_NextReceivedLen) ^ le16toh (m_ReceiveIV.key);
LogPrint (eLogDebug, "NTCP2: received length ", m_NextReceivedLen);
if (m_NextReceivedLen >= 16)
{
if (m_NextReceivedBuffer) delete[] m_NextReceivedBuffer;
m_NextReceivedBuffer = new uint8_t[m_NextReceivedLen];
boost::system::error_code ec;
size_t moreBytes = m_Socket.available(ec);
if (!ec && moreBytes >= m_NextReceivedLen)
{
// read and process message immediately if available
moreBytes = boost::asio::read (m_Socket, boost::asio::buffer(m_NextReceivedBuffer, m_NextReceivedLen), boost::asio::transfer_all (), ec);
HandleReceived (ec, moreBytes);
}
else
Receive ();
}
else
{
LogPrint (eLogError, "NTCP2: received length ", m_NextReceivedLen, " is too short");
Terminate ();
}
}
}
void NTCP2Session::Receive ()
{
if (IsTerminated ()) return;
#ifdef __linux__
const int one = 1;
setsockopt(m_Socket.native_handle(), IPPROTO_TCP, TCP_QUICKACK, &one, sizeof(one));
#endif
boost::asio::async_read (m_Socket, boost::asio::buffer(m_NextReceivedBuffer, m_NextReceivedLen), boost::asio::transfer_all (),
std::bind(&NTCP2Session::HandleReceived, shared_from_this (), std::placeholders::_1, std::placeholders::_2));
}
void NTCP2Session::HandleReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred)
{
if (ecode)
{
if (ecode != boost::asio::error::operation_aborted)
LogPrint (eLogWarning, "NTCP2: receive read error: ", ecode.message ());
Terminate ();
}
else
{
m_LastActivityTimestamp = i2p::util::GetSecondsSinceEpoch ();
m_NumReceivedBytes += bytes_transferred + 2; // + length
i2p::transport::transports.UpdateReceivedBytes (bytes_transferred);
uint8_t nonce[12];
CreateNonce (m_ReceiveSequenceNumber, nonce); m_ReceiveSequenceNumber++;
if (i2p::crypto::AEADChaCha20Poly1305 (m_NextReceivedBuffer, m_NextReceivedLen-16, nullptr, 0, m_ReceiveKey, nonce, m_NextReceivedBuffer, m_NextReceivedLen, false))
{
LogPrint (eLogDebug, "NTCP2: received message decrypted");
ProcessNextFrame (m_NextReceivedBuffer, m_NextReceivedLen-16);
delete[] m_NextReceivedBuffer; m_NextReceivedBuffer = nullptr; // we don't need received buffer anymore
ReceiveLength ();
}
else
{
LogPrint (eLogWarning, "NTCP2: Received AEAD verification failed ");
SendTerminationAndTerminate (eNTCP2DataPhaseAEADFailure);
}
}
}
void NTCP2Session::ProcessNextFrame (const uint8_t * frame, size_t len)
{
size_t offset = 0;
while (offset < len)
{
uint8_t blk = frame[offset];
offset++;
auto size = bufbe16toh (frame + offset);
offset += 2;
LogPrint (eLogDebug, "NTCP2: Block type ", (int)blk, " of size ", size);
if (size > len)
{
LogPrint (eLogError, "NTCP2: Unexpected block length ", size);
break;
}
switch (blk)
{
case eNTCP2BlkDateTime:
LogPrint (eLogDebug, "NTCP2: datetime");
break;
case eNTCP2BlkOptions:
LogPrint (eLogDebug, "NTCP2: options");
break;
case eNTCP2BlkRouterInfo:
{
LogPrint (eLogDebug, "NTCP2: RouterInfo flag=", (int)frame[offset]);
i2p::data::netdb.PostI2NPMsg (CreateI2NPMessage (eI2NPDummyMsg, frame + offset, size));
break;
}
case eNTCP2BlkI2NPMessage:
{
LogPrint (eLogDebug, "NTCP2: I2NP");
if (size > I2NP_MAX_MESSAGE_SIZE)
{
LogPrint (eLogError, "NTCP2: I2NP block is too long ", size);
break;
}
auto nextMsg = NewI2NPMessage (size);
nextMsg->Align (12); // for possible tunnel msg
nextMsg->len = nextMsg->offset + size + 7; // 7 more bytes for full I2NP header
memcpy (nextMsg->GetNTCP2Header (), frame + offset, size);
nextMsg->FromNTCP2 ();
m_Handler.PutNextMessage (nextMsg);
break;
}
case eNTCP2BlkTermination:
if (size >= 9)
{
LogPrint (eLogDebug, "NTCP2: termination. reason=", (int)(frame[offset + 8]));
Terminate ();
}
else
LogPrint (eLogWarning, "NTCP2: Unexpected termination block size ", size);
break;
case eNTCP2BlkPadding:
LogPrint (eLogDebug, "NTCP2: padding");
break;
default:
LogPrint (eLogWarning, "NTCP2: Unknown block type ", (int)blk);
}
offset += size;
}
m_Handler.Flush ();
}
void NTCP2Session::SetNextSentFrameLength (size_t frameLen, uint8_t * lengthBuf)
{
#if OPENSSL_SIPHASH
EVP_DigestSignInit (m_SendMDCtx, nullptr, nullptr, nullptr, nullptr);
EVP_DigestSignUpdate (m_SendMDCtx, m_SendIV.buf, 8);
size_t l = 8;
EVP_DigestSignFinal (m_SendMDCtx, m_SendIV.buf, &l);
#else
i2p::crypto::Siphash<8> (m_SendIV.buf, m_SendIV.buf, 8, m_SendSipKey);
#endif
// length must be in BigEndian
htobe16buf (lengthBuf, frameLen ^ le16toh (m_SendIV.key));
LogPrint (eLogDebug, "NTCP2: sent length ", frameLen);
}
void NTCP2Session::SendI2NPMsgs (std::vector<std::shared_ptr<I2NPMessage> >& msgs)
{
if (msgs.empty () || IsTerminated ()) return;
size_t totalLen = 0;
std::vector<std::pair<uint8_t *, size_t> > encryptBufs;
std::vector<boost::asio::const_buffer> bufs;
std::shared_ptr<I2NPMessage> first;
uint8_t * macBuf = nullptr;
for (auto& it: msgs)
{
it->ToNTCP2 ();
auto buf = it->GetNTCP2Header ();
auto len = it->GetNTCP2Length ();
// block header
buf -= 3;
buf[0] = eNTCP2BlkI2NPMessage; // blk
htobe16buf (buf + 1, len); // size
len += 3;
totalLen += len;
encryptBufs.push_back ( {buf, len} );
if (&it == &msgs.front ()) // first message
{
// allocate two bytes for length
buf -= 2; len += 2;
first = it;
}
if (&it == &msgs.back () && it->len + 16 < it->maxLen) // last message
{
// if it's long enough we add padding and MAC to it
// create padding block
auto paddingLen = CreatePaddingBlock (totalLen, buf + len, it->maxLen - it->len - 16);
if (paddingLen)
{
encryptBufs.push_back ( {buf + len, paddingLen} );
len += paddingLen;
totalLen += paddingLen;
}
macBuf = buf + len;
// allocate 16 bytes for MAC
len += 16;
}
bufs.push_back (boost::asio::buffer (buf, len));
}
if (!macBuf) // last block was not enough for MAC
{
// allocate send buffer
m_NextSendBuffer = new uint8_t[287]; // can be any size > 16, we just allocate 287 frequently
// crate padding block
auto paddingLen = CreatePaddingBlock (totalLen, m_NextSendBuffer, 287 - 16);
// and padding block to encrypt and send
if (paddingLen)
encryptBufs.push_back ( {m_NextSendBuffer, paddingLen} );
bufs.push_back (boost::asio::buffer (m_NextSendBuffer, paddingLen + 16));
macBuf = m_NextSendBuffer + paddingLen;
totalLen += paddingLen;
}
uint8_t nonce[12];
CreateNonce (m_SendSequenceNumber, nonce); m_SendSequenceNumber++;
i2p::crypto::AEADChaCha20Poly1305Encrypt (encryptBufs, m_SendKey, nonce, macBuf); // encrypt buffers
SetNextSentFrameLength (totalLen + 16, first->GetNTCP2Header () - 5); // frame length right before first block
// send buffers
m_IsSending = true;
boost::asio::async_write (m_Socket, bufs, boost::asio::transfer_all (),
std::bind(&NTCP2Session::HandleI2NPMsgsSent, shared_from_this (), std::placeholders::_1, std::placeholders::_2, msgs));
}
void NTCP2Session::HandleI2NPMsgsSent (const boost::system::error_code& ecode, std::size_t bytes_transferred, std::vector<std::shared_ptr<I2NPMessage> > msgs)
{
HandleNextFrameSent (ecode, bytes_transferred);
// msgs get destroyed here
}
void NTCP2Session::EncryptAndSendNextBuffer (size_t payloadLen)
{
if (IsTerminated ())
{
delete[] m_NextSendBuffer; m_NextSendBuffer = nullptr;
return;
}
// encrypt
uint8_t nonce[12];
CreateNonce (m_SendSequenceNumber, nonce); m_SendSequenceNumber++;
i2p::crypto::AEADChaCha20Poly1305Encrypt ({ {m_NextSendBuffer + 2, payloadLen} }, m_SendKey, nonce, m_NextSendBuffer + payloadLen + 2);
SetNextSentFrameLength (payloadLen + 16, m_NextSendBuffer);
// send
m_IsSending = true;
boost::asio::async_write (m_Socket, boost::asio::buffer (m_NextSendBuffer, payloadLen + 16 + 2), boost::asio::transfer_all (),
std::bind(&NTCP2Session::HandleNextFrameSent, shared_from_this (), std::placeholders::_1, std::placeholders::_2));
}
void NTCP2Session::HandleNextFrameSent (const boost::system::error_code& ecode, std::size_t bytes_transferred)
{
m_IsSending = false;
delete[] m_NextSendBuffer; m_NextSendBuffer = nullptr;
if (ecode)
{
if (ecode != boost::asio::error::operation_aborted)
LogPrint (eLogWarning, "NTCP2: Couldn't send frame ", ecode.message ());
Terminate ();
}
else
{
m_LastActivityTimestamp = i2p::util::GetSecondsSinceEpoch ();
m_NumSentBytes += bytes_transferred;
i2p::transport::transports.UpdateSentBytes (bytes_transferred);
LogPrint (eLogDebug, "NTCP2: Next frame sent ", bytes_transferred);
if (m_LastActivityTimestamp > m_NextRouterInfoResendTime)
{
m_NextRouterInfoResendTime += NTCP2_ROUTERINFO_RESEND_INTERVAL +
rand ()%NTCP2_ROUTERINFO_RESEND_INTERVAL_THRESHOLD;
SendRouterInfo ();
}
else
SendQueue ();
}
}
void NTCP2Session::SendQueue ()
{
if (!m_SendQueue.empty ())
{
std::vector<std::shared_ptr<I2NPMessage> > msgs;
size_t s = 0;
while (!m_SendQueue.empty ())
{
auto msg = m_SendQueue.front ();
size_t len = msg->GetNTCP2Length ();
if (s + len + 3 <= NTCP2_UNENCRYPTED_FRAME_MAX_SIZE) // 3 bytes block header
{
msgs.push_back (msg);
s += (len + 3);
m_SendQueue.pop_front ();
}
else if (len + 3 > NTCP2_UNENCRYPTED_FRAME_MAX_SIZE)
{
LogPrint (eLogError, "NTCP2: I2NP message of size ", len, " can't be sent. Dropped");
m_SendQueue.pop_front ();
}
else
break;
}
SendI2NPMsgs (msgs);
}
}
size_t NTCP2Session::CreatePaddingBlock (size_t msgLen, uint8_t * buf, size_t len)
{
if (len < 3) return 0;
len -= 3;
if (msgLen < 256) msgLen = 256; // for short message padding should not be always zero
size_t paddingSize = (msgLen*NTCP2_MAX_PADDING_RATIO)/100;
if (msgLen + paddingSize + 3 > NTCP2_UNENCRYPTED_FRAME_MAX_SIZE) paddingSize = NTCP2_UNENCRYPTED_FRAME_MAX_SIZE - msgLen -3;
if (paddingSize > len) paddingSize = len;
if (paddingSize) paddingSize = rand () % paddingSize;
buf[0] = eNTCP2BlkPadding; // blk
htobe16buf (buf + 1, paddingSize); // size
memset (buf + 3, 0, paddingSize);
return paddingSize + 3;
}
void NTCP2Session::SendRouterInfo ()
{
if (!IsEstablished ()) return;
auto riLen = i2p::context.GetRouterInfo ().GetBufferLen ();
size_t payloadLen = riLen + 4; // 3 bytes block header + 1 byte RI flag
m_NextSendBuffer = new uint8_t[payloadLen + 16 + 2 + 64]; // up to 64 bytes padding
m_NextSendBuffer[2] = eNTCP2BlkRouterInfo;
htobe16buf (m_NextSendBuffer + 3, riLen + 1); // size
m_NextSendBuffer[5] = 0; // flag
memcpy (m_NextSendBuffer + 6, i2p::context.GetRouterInfo ().GetBuffer (), riLen);
// padding block
auto paddingSize = CreatePaddingBlock (payloadLen, m_NextSendBuffer + 2 + payloadLen, 64);
payloadLen += paddingSize;
// encrypt and send
EncryptAndSendNextBuffer (payloadLen);
}
void NTCP2Session::SendTermination (NTCP2TerminationReason reason)
{
if (!m_SendKey || !m_SendSipKey) return;
m_NextSendBuffer = new uint8_t[49]; // 49 = 12 bytes message + 16 bytes MAC + 2 bytes size + up to 19 padding block
// termination block
m_NextSendBuffer[2] = eNTCP2BlkTermination;
m_NextSendBuffer[3] = 0; m_NextSendBuffer[4] = 9; // 9 bytes block size
htobe64buf (m_NextSendBuffer + 5, m_ReceiveSequenceNumber);
m_NextSendBuffer[13] = (uint8_t)reason;
// padding block
auto paddingSize = CreatePaddingBlock (12, m_NextSendBuffer + 14, 19);
// encrypt and send
EncryptAndSendNextBuffer (paddingSize + 12);
}
void NTCP2Session::SendTerminationAndTerminate (NTCP2TerminationReason reason)
{
SendTermination (reason);
m_Server.GetService ().post (std::bind (&NTCP2Session::Terminate, shared_from_this ())); // let termination message go
}
void NTCP2Session::SendI2NPMessages (const std::vector<std::shared_ptr<I2NPMessage> >& msgs)
{
m_Server.GetService ().post (std::bind (&NTCP2Session::PostI2NPMessages, shared_from_this (), msgs));
}
void NTCP2Session::PostI2NPMessages (std::vector<std::shared_ptr<I2NPMessage> > msgs)
{
if (m_IsTerminated) return;
for (auto it: msgs)
m_SendQueue.push_back (it);
if (!m_IsSending)
SendQueue ();
else if (m_SendQueue.size () > NTCP2_MAX_OUTGOING_QUEUE_SIZE)
{
LogPrint (eLogWarning, "NTCP2: outgoing messages queue size to ",
GetIdentHashBase64(), " exceeds ", NTCP2_MAX_OUTGOING_QUEUE_SIZE);
Terminate ();
}
}
void NTCP2Session::SendLocalRouterInfo ()
{
if (!IsOutgoing ()) // we send it in SessionConfirmed
m_Server.GetService ().post (std::bind (&NTCP2Session::SendRouterInfo, shared_from_this ()));
}
NTCP2Server::NTCP2Server ():
RunnableServiceWithWork ("NTCP2"), m_TerminationTimer (GetService ()),
m_ProxyType(eNoProxy), m_Resolver(GetService ())
{
}
NTCP2Server::~NTCP2Server ()
{
Stop ();
}
void NTCP2Server::Start ()
{
if (!IsRunning ())
{
StartIOService ();
if(UsingProxy())
{
LogPrint(eLogInfo, "NTCP2: Using proxy to connect to peers");
// TODO: resolve proxy until it is resolved
boost::asio::ip::tcp::resolver::query q(m_ProxyAddress, std::to_string(m_ProxyPort));
boost::system::error_code e;
auto itr = m_Resolver.resolve(q, e);
if(e)
LogPrint(eLogError, "NTCP2: Failed to resolve proxy ", e.message());
else
{
m_ProxyEndpoint.reset (new boost::asio::ip::tcp::endpoint(*itr));
if (m_ProxyEndpoint)
LogPrint(eLogDebug, "NTCP2: m_ProxyEndpoint ", *m_ProxyEndpoint);
}
}
else
LogPrint(eLogInfo, "NTCP2: Proxy is not used");
// start acceptors
auto& addresses = context.GetRouterInfo ().GetAddresses ();
for (const auto& address: addresses)
{
if (!address) continue;
if (address->IsPublishedNTCP2 () && address->port)
{
if (address->host.is_v4())
{
try
{
auto ep = m_Address4 ? boost::asio::ip::tcp::endpoint (m_Address4->address(), address->port):
boost::asio::ip::tcp::endpoint (boost::asio::ip::tcp::v4(), address->port);
m_NTCP2Acceptor.reset (new boost::asio::ip::tcp::acceptor (GetService (), ep));
}
catch ( std::exception & ex )
{
LogPrint(eLogError, "NTCP2: Failed to bind to v4 port ", address->port, ex.what());
ThrowFatal ("Unable to start IPv4 NTCP2 transport at port ", address->port, ": ", ex.what ());
continue;
}
LogPrint (eLogInfo, "NTCP2: Start listening v4 TCP port ", address->port);
auto conn = std::make_shared<NTCP2Session>(*this);
m_NTCP2Acceptor->async_accept(conn->GetSocket (), std::bind (&NTCP2Server::HandleAccept, this, conn, std::placeholders::_1));
}
else if (address->host.is_v6() && (context.SupportsV6 () || context.SupportsMesh ()))
{
m_NTCP2V6Acceptor.reset (new boost::asio::ip::tcp::acceptor (GetService ()));
try
{
m_NTCP2V6Acceptor->open (boost::asio::ip::tcp::v6());
m_NTCP2V6Acceptor->set_option (boost::asio::ip::v6_only (true));
m_NTCP2V6Acceptor->set_option (boost::asio::socket_base::reuse_address (true));
auto ep = boost::asio::ip::tcp::endpoint(boost::asio::ip::tcp::v6(), address->port);
if (m_Address6 && !context.SupportsMesh ())
ep = boost::asio::ip::tcp::endpoint (m_Address6->address(), address->port);
else if (m_YggdrasilAddress && !context.SupportsV6 ())
ep = boost::asio::ip::tcp::endpoint (m_YggdrasilAddress->address(), address->port);
m_NTCP2V6Acceptor->bind (ep);
m_NTCP2V6Acceptor->listen ();
LogPrint (eLogInfo, "NTCP2: Start listening v6 TCP port ", address->port);
auto conn = std::make_shared<NTCP2Session> (*this);
m_NTCP2V6Acceptor->async_accept(conn->GetSocket (), std::bind (&NTCP2Server::HandleAcceptV6, this, conn, std::placeholders::_1));
}
catch ( std::exception & ex )
{
LogPrint(eLogError, "NTCP2: failed to bind to v6 port ", address->port, ": ", ex.what());
ThrowFatal ("Unable to start IPv6 NTCP2 transport at port ", address->port, ": ", ex.what ());
continue;
}
}
}
}
ScheduleTermination ();
}
}
void NTCP2Server::Stop ()
{
{
// we have to copy it because Terminate changes m_NTCP2Sessions
auto ntcpSessions = m_NTCP2Sessions;
for (auto& it: ntcpSessions)
it.second->Terminate ();
for (auto& it: m_PendingIncomingSessions)
it->Terminate ();
}
m_NTCP2Sessions.clear ();
if (IsRunning ())
{
m_TerminationTimer.cancel ();
m_ProxyEndpoint = nullptr;
}
StopIOService ();
}
bool NTCP2Server::AddNTCP2Session (std::shared_ptr<NTCP2Session> session, bool incoming)
{
if (!session) return false;
if (incoming)
m_PendingIncomingSessions.remove (session);
if (!session->GetRemoteIdentity ()) return false;
auto& ident = session->GetRemoteIdentity ()->GetIdentHash ();
auto it = m_NTCP2Sessions.find (ident);
if (it != m_NTCP2Sessions.end ())
{
LogPrint (eLogWarning, "NTCP2: session to ", ident.ToBase64 (), " already exists");
if (incoming)
// replace by new session
it->second->Terminate ();
else
return false;
}
m_NTCP2Sessions.insert (std::make_pair (ident, session));
return true;
}
void NTCP2Server::RemoveNTCP2Session (std::shared_ptr<NTCP2Session> session)
{
if (session && session->GetRemoteIdentity ())
m_NTCP2Sessions.erase (session->GetRemoteIdentity ()->GetIdentHash ());
}
std::shared_ptr<NTCP2Session> NTCP2Server::FindNTCP2Session (const i2p::data::IdentHash& ident)
{
auto it = m_NTCP2Sessions.find (ident);
if (it != m_NTCP2Sessions.end ())
return it->second;
return nullptr;
}
void NTCP2Server::Connect(std::shared_ptr<NTCP2Session> conn)
{
if (!conn || conn->GetRemoteEndpoint ().address ().is_unspecified ())
{
LogPrint (eLogError, "NTCP2: Can't connect to unspecified address");
return;
}
LogPrint (eLogDebug, "NTCP2: Connecting to ", conn->GetRemoteEndpoint ());
GetService ().post([this, conn]()
{
if (this->AddNTCP2Session (conn))
{
auto timer = std::make_shared<boost::asio::deadline_timer>(GetService ());
auto timeout = NTCP2_CONNECT_TIMEOUT * 5;
conn->SetTerminationTimeout(timeout * 2);
timer->expires_from_now (boost::posix_time::seconds(timeout));
timer->async_wait ([conn, timeout](const boost::system::error_code& ecode)
{
if (ecode != boost::asio::error::operation_aborted)
{
LogPrint (eLogInfo, "NTCP2: Not connected in ", timeout, " seconds");
conn->Terminate ();
}
});
// bind to local address
std::shared_ptr<boost::asio::ip::tcp::endpoint> localAddress;
if (conn->GetRemoteEndpoint ().address ().is_v6 ())
{
if (i2p::util::net::IsYggdrasilAddress (conn->GetRemoteEndpoint ().address ()))
localAddress = m_YggdrasilAddress;
else
localAddress = m_Address6;
conn->GetSocket ().open (boost::asio::ip::tcp::v6 ());
}
else
{
localAddress = m_Address4;
conn->GetSocket ().open (boost::asio::ip::tcp::v4 ());
}
if (localAddress)
{
boost::system::error_code ec;
conn->GetSocket ().bind (*localAddress, ec);
if (ec)
LogPrint (eLogError, "NTCP2: can't bind to ", localAddress->address ().to_string (), ": ", ec.message ());
}
conn->GetSocket ().async_connect (conn->GetRemoteEndpoint (), std::bind (&NTCP2Server::HandleConnect, this, std::placeholders::_1, conn, timer));
}
else
conn->Terminate ();
});
}
void NTCP2Server::HandleConnect (const boost::system::error_code& ecode, std::shared_ptr<NTCP2Session> conn, std::shared_ptr<boost::asio::deadline_timer> timer)
{
timer->cancel ();
if (ecode)
{
LogPrint (eLogInfo, "NTCP2: Connect error ", ecode.message ());
conn->Terminate ();
}
else
{
LogPrint (eLogDebug, "NTCP2: Connected to ", conn->GetRemoteEndpoint ());
conn->ClientLogin ();
}
}
void NTCP2Server::HandleAccept (std::shared_ptr<NTCP2Session> conn, const boost::system::error_code& error)
{
if (!error)
{
boost::system::error_code ec;
auto ep = conn->GetSocket ().remote_endpoint(ec);
if (!ec)
{
LogPrint (eLogDebug, "NTCP2: Connected from ", ep);
if (conn)
{
conn->SetRemoteEndpoint (ep);
conn->ServerLogin ();
m_PendingIncomingSessions.push_back (conn);
conn = nullptr;
}
}
else
LogPrint (eLogError, "NTCP2: Connected from error ", ec.message ());
}
else
LogPrint (eLogError, "NTCP2: Accept error ", error.message ());
if (error != boost::asio::error::operation_aborted)
{
if (!conn) // connection is used, create new one
conn = std::make_shared<NTCP2Session> (*this);
else // reuse failed
conn->Close ();
m_NTCP2Acceptor->async_accept(conn->GetSocket (), std::bind (&NTCP2Server::HandleAccept, this,
conn, std::placeholders::_1));
}
}
void NTCP2Server::HandleAcceptV6 (std::shared_ptr<NTCP2Session> conn, const boost::system::error_code& error)
{
if (!error)
{
boost::system::error_code ec;
auto ep = conn->GetSocket ().remote_endpoint(ec);
if (!ec)
{
LogPrint (eLogDebug, "NTCP2: Connected from ", ep);
if (conn)
{
conn->SetRemoteEndpoint (ep);
conn->ServerLogin ();
m_PendingIncomingSessions.push_back (conn);
}
}
else
LogPrint (eLogError, "NTCP2: Connected from error ", ec.message ());
}
if (error != boost::asio::error::operation_aborted)
{
conn = std::make_shared<NTCP2Session> (*this);
m_NTCP2V6Acceptor->async_accept(conn->GetSocket (), std::bind (&NTCP2Server::HandleAcceptV6, this,
conn, std::placeholders::_1));
}
}
void NTCP2Server::ScheduleTermination ()
{
m_TerminationTimer.expires_from_now (boost::posix_time::seconds(NTCP2_TERMINATION_CHECK_TIMEOUT));
m_TerminationTimer.async_wait (std::bind (&NTCP2Server::HandleTerminationTimer,
this, std::placeholders::_1));
}
void NTCP2Server::HandleTerminationTimer (const boost::system::error_code& ecode)
{
if (ecode != boost::asio::error::operation_aborted)
{
auto ts = i2p::util::GetSecondsSinceEpoch ();
// established
for (auto& it: m_NTCP2Sessions)
if (it.second->IsTerminationTimeoutExpired (ts))
{
auto session = it.second;
LogPrint (eLogDebug, "NTCP2: No activity for ", session->GetTerminationTimeout (), " seconds");
session->TerminateByTimeout (); // it doesn't change m_NTCP2Session right a way
}
// pending
for (auto it = m_PendingIncomingSessions.begin (); it != m_PendingIncomingSessions.end ();)
{
if ((*it)->IsEstablished () || (*it)->IsTerminationTimeoutExpired (ts))
{
(*it)->Terminate ();
it = m_PendingIncomingSessions.erase (it); // established of expired
}
else if ((*it)->IsTerminated ())
it = m_PendingIncomingSessions.erase (it); // already terminated
else
it++;
}
ScheduleTermination ();
}
}
void NTCP2Server::ConnectWithProxy (std::shared_ptr<NTCP2Session> conn)
{
if(!m_ProxyEndpoint) return;
if (!conn || conn->GetRemoteEndpoint ().address ().is_unspecified ())
{
LogPrint (eLogError, "NTCP2: Can't connect to unspecified address");
return;
}
GetService().post([this, conn]()
{
if (this->AddNTCP2Session (conn))
{
auto timer = std::make_shared<boost::asio::deadline_timer>(GetService());
auto timeout = NTCP2_CONNECT_TIMEOUT * 5;
conn->SetTerminationTimeout(timeout * 2);
timer->expires_from_now (boost::posix_time::seconds(timeout));
timer->async_wait ([conn, timeout](const boost::system::error_code& ecode)
{
if (ecode != boost::asio::error::operation_aborted)
{
LogPrint (eLogInfo, "NTCP2: Not connected in ", timeout, " seconds");
conn->Terminate ();
}
});
conn->GetSocket ().async_connect (*m_ProxyEndpoint, std::bind (&NTCP2Server::HandleProxyConnect, this, std::placeholders::_1, conn, timer));
}
});
}
void NTCP2Server::UseProxy(ProxyType proxytype, const std::string& addr, uint16_t port,
const std::string& user, const std::string& pass)
{
m_ProxyType = proxytype;
m_ProxyAddress = addr;
m_ProxyPort = port;
if (m_ProxyType == eHTTPProxy )
m_ProxyAuthorization = i2p::http::CreateBasicAuthorizationString (user, pass);
}
void NTCP2Server::HandleProxyConnect(const boost::system::error_code& ecode, std::shared_ptr<NTCP2Session> conn, std::shared_ptr<boost::asio::deadline_timer> timer)
{
if (ecode)
{
LogPrint(eLogWarning, "NTCP2: failed to connect to proxy ", ecode.message());
timer->cancel();
conn->Terminate();
return;
}
switch (m_ProxyType)
{
case eSocksProxy:
{
// TODO: support username/password auth etc
static const uint8_t buff[3] = {0x05, 0x01, 0x00};
boost::asio::async_write(conn->GetSocket(), boost::asio::buffer(buff, 3), boost::asio::transfer_all(),
[] (const boost::system::error_code & ec, std::size_t transferred)
{
(void) transferred;
if(ec)
{
LogPrint(eLogWarning, "NTCP2: socks5 write error ", ec.message());
}
});
auto readbuff = std::make_shared<std::vector<uint8_t> >(2);
boost::asio::async_read(conn->GetSocket(), boost::asio::buffer(readbuff->data (), 2),
[this, readbuff, timer, conn](const boost::system::error_code & ec, std::size_t transferred)
{
if(ec)
{
LogPrint(eLogError, "NTCP2: socks5 read error ", ec.message());
timer->cancel();
conn->Terminate();
return;
}
else if(transferred == 2)
{
if((*readbuff)[1] == 0x00)
{
AfterSocksHandshake(conn, timer);
return;
}
else if ((*readbuff)[1] == 0xff)
{
LogPrint(eLogError, "NTCP2: socks5 proxy rejected authentication");
timer->cancel();
conn->Terminate();
return;
}
LogPrint(eLogError, "NTCP2:", (int)(*readbuff)[1]);
}
LogPrint(eLogError, "NTCP2: socks5 server gave invalid response");
timer->cancel();
conn->Terminate();
});
break;
}
case eHTTPProxy:
{
auto& ep = conn->GetRemoteEndpoint ();
i2p::http::HTTPReq req;
req.method = "CONNECT";
req.version ="HTTP/1.1";
if(ep.address ().is_v6 ())
req.uri = "[" + ep.address ().to_string() + "]:" + std::to_string(ep.port ());
else
req.uri = ep.address ().to_string() + ":" + std::to_string(ep.port ());
if (!m_ProxyAuthorization.empty ())
req.AddHeader("Proxy-Authorization", m_ProxyAuthorization);
boost::asio::streambuf writebuff;
std::ostream out(&writebuff);
out << req.to_string();
boost::asio::async_write(conn->GetSocket(), writebuff.data(), boost::asio::transfer_all(),
[](const boost::system::error_code & ec, std::size_t transferred)
{
(void) transferred;
if(ec)
LogPrint(eLogError, "NTCP2: http proxy write error ", ec.message());
});
boost::asio::streambuf * readbuff = new boost::asio::streambuf;
boost::asio::async_read_until(conn->GetSocket(), *readbuff, "\r\n\r\n",
[readbuff, timer, conn] (const boost::system::error_code & ec, std::size_t transferred)
{
if(ec)
{
LogPrint(eLogError, "NTCP2: http proxy read error ", ec.message());
timer->cancel();
conn->Terminate();
}
else
{
readbuff->commit(transferred);
i2p::http::HTTPRes res;
if(res.parse(boost::asio::buffer_cast<const char*>(readbuff->data()), readbuff->size()) > 0)
{
if(res.code == 200)
{
timer->cancel();
conn->ClientLogin();
delete readbuff;
return;
}
else
LogPrint(eLogError, "NTCP2: http proxy rejected request ", res.code);
}
else
LogPrint(eLogError, "NTCP2: http proxy gave malformed response");
timer->cancel();
conn->Terminate();
delete readbuff;
}
});
break;
}
default:
LogPrint(eLogError, "NTCP2: unknown proxy type, invalid state");
}
}
void NTCP2Server::AfterSocksHandshake(std::shared_ptr<NTCP2Session> conn, std::shared_ptr<boost::asio::deadline_timer> timer)
{
// build request
size_t sz = 6; // header + port
auto buff = std::make_shared<std::vector<int8_t> >(256);
auto readbuff = std::make_shared<std::vector<int8_t> >(256);
(*buff)[0] = 0x05;
(*buff)[1] = 0x01;
(*buff)[2] = 0x00;
auto& ep = conn->GetRemoteEndpoint ();
if(ep.address ().is_v4 ())
{
(*buff)[3] = 0x01;
auto addrbytes = ep.address ().to_v4().to_bytes();
sz += 4;
memcpy(buff->data () + 4, addrbytes.data(), 4);
}
else if (ep.address ().is_v6 ())
{
(*buff)[3] = 0x04;
auto addrbytes = ep.address ().to_v6().to_bytes();
sz += 16;
memcpy(buff->data () + 4, addrbytes.data(), 16);
}
else
{
// We mustn't really fall here because all connections are made to IP addresses
LogPrint(eLogError, "NTCP2: Tried to connect to unexpected address via proxy");
return;
}
htobe16buf(buff->data () + sz - 2, ep.port ());
boost::asio::async_write(conn->GetSocket(), boost::asio::buffer(buff->data (), sz), boost::asio::transfer_all(),
[buff](const boost::system::error_code & ec, std::size_t written)
{
if(ec)
{
LogPrint(eLogError, "NTCP2: failed to write handshake to socks proxy ", ec.message());
return;
}
});
boost::asio::async_read(conn->GetSocket(), boost::asio::buffer(readbuff->data (), 10),
[timer, conn, sz, readbuff](const boost::system::error_code & e, std::size_t transferred)
{
if(e)
{
LogPrint(eLogError, "NTCP2: socks proxy read error ", e.message());
}
else if(transferred == sz)
{
if((*readbuff)[1] == 0x00)
{
timer->cancel();
conn->ClientLogin();
return;
}
}
timer->cancel();
conn->Terminate();
});
}
void NTCP2Server::SetLocalAddress (const boost::asio::ip::address& localAddress)
{
auto addr = std::make_shared<boost::asio::ip::tcp::endpoint>(boost::asio::ip::tcp::endpoint(localAddress, 0));
if (localAddress.is_v6 ())
{
if (i2p::util::net::IsYggdrasilAddress (localAddress))
m_YggdrasilAddress = addr;
else
m_Address6 = addr;
}
else
m_Address4 = addr;
}
}
}