mirror of https://github.com/PurpleI2P/i2pd
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
1013 lines
31 KiB
C++
1013 lines
31 KiB
C++
#include <string.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "I2PEndian.h"
|
|
#include "Base.h"
|
|
#include "Crypto.h"
|
|
#include "Log.h"
|
|
#include "Timestamp.h"
|
|
#include "I2NPProtocol.h"
|
|
#include "RouterContext.h"
|
|
#include "Transports.h"
|
|
#include "NetDb.h"
|
|
#include "NTCPSession.h"
|
|
#ifdef WITH_EVENTS
|
|
#include "Event.h"
|
|
#endif
|
|
|
|
using namespace i2p::crypto;
|
|
|
|
namespace i2p
|
|
{
|
|
namespace transport
|
|
{
|
|
NTCPSession::NTCPSession (NTCPServer& server, std::shared_ptr<const i2p::data::RouterInfo> in_RemoteRouter):
|
|
TransportSession (in_RemoteRouter, NTCP_TERMINATION_TIMEOUT),
|
|
m_Server (server), m_Socket (m_Server.GetService ()),
|
|
m_IsEstablished (false), m_IsTerminated (false),
|
|
m_ReceiveBufferOffset (0), m_NextMessage (nullptr), m_IsSending (false)
|
|
{
|
|
m_Establisher = new Establisher;
|
|
}
|
|
|
|
NTCPSession::~NTCPSession ()
|
|
{
|
|
delete m_Establisher;
|
|
}
|
|
|
|
void NTCPSession::CreateAESKey (uint8_t * pubKey, i2p::crypto::AESKey& key)
|
|
{
|
|
uint8_t sharedKey[256];
|
|
m_DHKeysPair->Agree (pubKey, sharedKey);
|
|
|
|
uint8_t * aesKey = key;
|
|
if (sharedKey[0] & 0x80)
|
|
{
|
|
aesKey[0] = 0;
|
|
memcpy (aesKey + 1, sharedKey, 31);
|
|
}
|
|
else if (sharedKey[0])
|
|
memcpy (aesKey, sharedKey, 32);
|
|
else
|
|
{
|
|
// find first non-zero byte
|
|
uint8_t * nonZero = sharedKey + 1;
|
|
while (!*nonZero)
|
|
{
|
|
nonZero++;
|
|
if (nonZero - sharedKey > 32)
|
|
{
|
|
LogPrint (eLogWarning, "NTCP: First 32 bytes of shared key is all zeros, ignored");
|
|
return;
|
|
}
|
|
}
|
|
memcpy (aesKey, nonZero, 32);
|
|
}
|
|
}
|
|
|
|
void NTCPSession::Done ()
|
|
{
|
|
m_Server.GetService ().post (std::bind (&NTCPSession::Terminate, shared_from_this ()));
|
|
}
|
|
|
|
void NTCPSession::Terminate ()
|
|
{
|
|
if (!m_IsTerminated)
|
|
{
|
|
m_IsTerminated = true;
|
|
m_IsEstablished = false;
|
|
m_Socket.close ();
|
|
transports.PeerDisconnected (shared_from_this ());
|
|
m_Server.RemoveNTCPSession (shared_from_this ());
|
|
m_SendQueue.clear ();
|
|
m_NextMessage = nullptr;
|
|
LogPrint (eLogDebug, "NTCP: session terminated");
|
|
}
|
|
}
|
|
|
|
void NTCPSession::Connected ()
|
|
{
|
|
m_IsEstablished = true;
|
|
|
|
delete m_Establisher;
|
|
m_Establisher = nullptr;
|
|
|
|
m_DHKeysPair = nullptr;
|
|
|
|
SendTimeSyncMessage ();
|
|
transports.PeerConnected (shared_from_this ());
|
|
}
|
|
|
|
void NTCPSession::ClientLogin ()
|
|
{
|
|
if (!m_DHKeysPair)
|
|
m_DHKeysPair = transports.GetNextDHKeysPair ();
|
|
// send Phase1
|
|
const uint8_t * x = m_DHKeysPair->GetPublicKey ();
|
|
memcpy (m_Establisher->phase1.pubKey, x, 256);
|
|
SHA256(x, 256, m_Establisher->phase1.HXxorHI);
|
|
const uint8_t * ident = m_RemoteIdentity->GetIdentHash ();
|
|
for (int i = 0; i < 32; i++)
|
|
m_Establisher->phase1.HXxorHI[i] ^= ident[i];
|
|
|
|
boost::asio::async_write (m_Socket, boost::asio::buffer (&m_Establisher->phase1, sizeof (NTCPPhase1)), boost::asio::transfer_all (),
|
|
std::bind(&NTCPSession::HandlePhase1Sent, shared_from_this (), std::placeholders::_1, std::placeholders::_2));
|
|
}
|
|
|
|
void NTCPSession::ServerLogin ()
|
|
{
|
|
boost::system::error_code ec;
|
|
auto ep = m_Socket.remote_endpoint(ec);
|
|
if (!ec)
|
|
{
|
|
m_ConnectedFrom = ep.address ();
|
|
// receive Phase1
|
|
boost::asio::async_read (m_Socket, boost::asio::buffer(&m_Establisher->phase1, sizeof (NTCPPhase1)), boost::asio::transfer_all (),
|
|
std::bind(&NTCPSession::HandlePhase1Received, shared_from_this (),
|
|
std::placeholders::_1, std::placeholders::_2));
|
|
}
|
|
}
|
|
|
|
void NTCPSession::HandlePhase1Sent (const boost::system::error_code& ecode, std::size_t bytes_transferred)
|
|
{
|
|
(void) bytes_transferred;
|
|
if (ecode)
|
|
{
|
|
LogPrint (eLogInfo, "NTCP: couldn't send Phase 1 message: ", ecode.message ());
|
|
if (ecode != boost::asio::error::operation_aborted)
|
|
Terminate ();
|
|
}
|
|
else
|
|
{
|
|
boost::asio::async_read (m_Socket, boost::asio::buffer(&m_Establisher->phase2, sizeof (NTCPPhase2)), boost::asio::transfer_all (),
|
|
std::bind(&NTCPSession::HandlePhase2Received, shared_from_this (),
|
|
std::placeholders::_1, std::placeholders::_2));
|
|
}
|
|
}
|
|
|
|
void NTCPSession::HandlePhase1Received (const boost::system::error_code& ecode, std::size_t bytes_transferred)
|
|
{
|
|
(void) bytes_transferred;
|
|
if (ecode)
|
|
{
|
|
LogPrint (eLogInfo, "NTCP: phase 1 read error: ", ecode.message ());
|
|
if (ecode != boost::asio::error::operation_aborted)
|
|
Terminate ();
|
|
}
|
|
else
|
|
{
|
|
// verify ident
|
|
uint8_t digest[32];
|
|
SHA256(m_Establisher->phase1.pubKey, 256, digest);
|
|
const uint8_t * ident = i2p::context.GetIdentHash ();
|
|
for (int i = 0; i < 32; i++)
|
|
{
|
|
if ((m_Establisher->phase1.HXxorHI[i] ^ ident[i]) != digest[i])
|
|
{
|
|
LogPrint (eLogError, "NTCP: phase 1 error: ident mismatch");
|
|
Terminate ();
|
|
return;
|
|
}
|
|
}
|
|
|
|
SendPhase2 ();
|
|
}
|
|
}
|
|
|
|
void NTCPSession::SendPhase2 ()
|
|
{
|
|
if (!m_DHKeysPair)
|
|
m_DHKeysPair = transports.GetNextDHKeysPair ();
|
|
const uint8_t * y = m_DHKeysPair->GetPublicKey ();
|
|
memcpy (m_Establisher->phase2.pubKey, y, 256);
|
|
uint8_t xy[512];
|
|
memcpy (xy, m_Establisher->phase1.pubKey, 256);
|
|
memcpy (xy + 256, y, 256);
|
|
SHA256(xy, 512, m_Establisher->phase2.encrypted.hxy);
|
|
uint32_t tsB = htobe32 (i2p::util::GetSecondsSinceEpoch ());
|
|
memcpy (m_Establisher->phase2.encrypted.timestamp, &tsB, 4);
|
|
RAND_bytes (m_Establisher->phase2.encrypted.filler, 12);
|
|
|
|
i2p::crypto::AESKey aesKey;
|
|
CreateAESKey (m_Establisher->phase1.pubKey, aesKey);
|
|
m_Encryption.SetKey (aesKey);
|
|
m_Encryption.SetIV (y + 240);
|
|
m_Decryption.SetKey (aesKey);
|
|
m_Decryption.SetIV (m_Establisher->phase1.HXxorHI + 16);
|
|
|
|
m_Encryption.Encrypt ((uint8_t *)&m_Establisher->phase2.encrypted, sizeof(m_Establisher->phase2.encrypted), (uint8_t *)&m_Establisher->phase2.encrypted);
|
|
boost::asio::async_write (m_Socket, boost::asio::buffer (&m_Establisher->phase2, sizeof (NTCPPhase2)), boost::asio::transfer_all (),
|
|
std::bind(&NTCPSession::HandlePhase2Sent, shared_from_this (), std::placeholders::_1, std::placeholders::_2, tsB));
|
|
|
|
}
|
|
|
|
void NTCPSession::HandlePhase2Sent (const boost::system::error_code& ecode, std::size_t bytes_transferred, uint32_t tsB)
|
|
{
|
|
(void) bytes_transferred;
|
|
if (ecode)
|
|
{
|
|
LogPrint (eLogInfo, "NTCP: Couldn't send Phase 2 message: ", ecode.message ());
|
|
if (ecode != boost::asio::error::operation_aborted)
|
|
Terminate ();
|
|
}
|
|
else
|
|
{
|
|
boost::asio::async_read (m_Socket, boost::asio::buffer(m_ReceiveBuffer, NTCP_DEFAULT_PHASE3_SIZE), boost::asio::transfer_all (),
|
|
std::bind(&NTCPSession::HandlePhase3Received, shared_from_this (),
|
|
std::placeholders::_1, std::placeholders::_2, tsB));
|
|
}
|
|
}
|
|
|
|
void NTCPSession::HandlePhase2Received (const boost::system::error_code& ecode, std::size_t bytes_transferred)
|
|
{
|
|
(void) bytes_transferred;
|
|
if (ecode)
|
|
{
|
|
LogPrint (eLogInfo, "NTCP: Phase 2 read error: ", ecode.message (), ". Wrong ident assumed");
|
|
if (ecode != boost::asio::error::operation_aborted)
|
|
{
|
|
// this RI is not valid
|
|
i2p::data::netdb.SetUnreachable (GetRemoteIdentity ()->GetIdentHash (), true);
|
|
transports.ReuseDHKeysPair (m_DHKeysPair);
|
|
m_DHKeysPair = nullptr;
|
|
Terminate ();
|
|
}
|
|
}
|
|
else
|
|
{
|
|
i2p::crypto::AESKey aesKey;
|
|
CreateAESKey (m_Establisher->phase2.pubKey, aesKey);
|
|
m_Decryption.SetKey (aesKey);
|
|
m_Decryption.SetIV (m_Establisher->phase2.pubKey + 240);
|
|
m_Encryption.SetKey (aesKey);
|
|
m_Encryption.SetIV (m_Establisher->phase1.HXxorHI + 16);
|
|
|
|
m_Decryption.Decrypt((uint8_t *)&m_Establisher->phase2.encrypted, sizeof(m_Establisher->phase2.encrypted), (uint8_t *)&m_Establisher->phase2.encrypted);
|
|
// verify
|
|
uint8_t xy[512];
|
|
memcpy (xy, m_DHKeysPair->GetPublicKey (), 256);
|
|
memcpy (xy + 256, m_Establisher->phase2.pubKey, 256);
|
|
uint8_t digest[32];
|
|
SHA256 (xy, 512, digest);
|
|
if (memcmp(m_Establisher->phase2.encrypted.hxy, digest, 32))
|
|
{
|
|
LogPrint (eLogError, "NTCP: Phase 2 process error: incorrect hash");
|
|
transports.ReuseDHKeysPair (m_DHKeysPair);
|
|
m_DHKeysPair = nullptr;
|
|
Terminate ();
|
|
return ;
|
|
}
|
|
SendPhase3 ();
|
|
}
|
|
}
|
|
|
|
void NTCPSession::SendPhase3 ()
|
|
{
|
|
auto keys = i2p::context.GetPrivateKeys ();
|
|
uint8_t * buf = m_ReceiveBuffer;
|
|
htobe16buf (buf, keys.GetPublic ()->GetFullLen ());
|
|
buf += 2;
|
|
buf += i2p::context.GetIdentity ()->ToBuffer (buf, NTCP_BUFFER_SIZE);
|
|
uint32_t tsA = htobe32 (i2p::util::GetSecondsSinceEpoch ());
|
|
htobuf32(buf,tsA);
|
|
buf += 4;
|
|
size_t signatureLen = keys.GetPublic ()->GetSignatureLen ();
|
|
size_t len = (buf - m_ReceiveBuffer) + signatureLen;
|
|
size_t paddingSize = len & 0x0F; // %16
|
|
if (paddingSize > 0)
|
|
{
|
|
paddingSize = 16 - paddingSize;
|
|
// fill padding with random data
|
|
RAND_bytes(buf, paddingSize);
|
|
buf += paddingSize;
|
|
len += paddingSize;
|
|
}
|
|
|
|
SignedData s;
|
|
s.Insert (m_Establisher->phase1.pubKey, 256); // x
|
|
s.Insert (m_Establisher->phase2.pubKey, 256); // y
|
|
s.Insert (m_RemoteIdentity->GetIdentHash (), 32); // ident
|
|
s.Insert (tsA); // tsA
|
|
s.Insert (m_Establisher->phase2.encrypted.timestamp, 4); // tsB
|
|
s.Sign (keys, buf);
|
|
|
|
m_Encryption.Encrypt(m_ReceiveBuffer, len, m_ReceiveBuffer);
|
|
boost::asio::async_write (m_Socket, boost::asio::buffer (m_ReceiveBuffer, len), boost::asio::transfer_all (),
|
|
std::bind(&NTCPSession::HandlePhase3Sent, shared_from_this (), std::placeholders::_1, std::placeholders::_2, tsA));
|
|
}
|
|
|
|
void NTCPSession::HandlePhase3Sent (const boost::system::error_code& ecode, std::size_t bytes_transferred, uint32_t tsA)
|
|
{
|
|
(void) bytes_transferred;
|
|
if (ecode)
|
|
{
|
|
LogPrint (eLogInfo, "NTCP: Couldn't send Phase 3 message: ", ecode.message ());
|
|
if (ecode != boost::asio::error::operation_aborted)
|
|
Terminate ();
|
|
}
|
|
else
|
|
{
|
|
// wait for phase4
|
|
auto signatureLen = m_RemoteIdentity->GetSignatureLen ();
|
|
size_t paddingSize = signatureLen & 0x0F; // %16
|
|
if (paddingSize > 0) signatureLen += (16 - paddingSize);
|
|
boost::asio::async_read (m_Socket, boost::asio::buffer(m_ReceiveBuffer, signatureLen), boost::asio::transfer_all (),
|
|
std::bind(&NTCPSession::HandlePhase4Received, shared_from_this (),
|
|
std::placeholders::_1, std::placeholders::_2, tsA));
|
|
}
|
|
}
|
|
|
|
void NTCPSession::HandlePhase3Received (const boost::system::error_code& ecode, std::size_t bytes_transferred, uint32_t tsB)
|
|
{
|
|
if (ecode)
|
|
{
|
|
LogPrint (eLogInfo, "NTCP: Phase 3 read error: ", ecode.message ());
|
|
if (ecode != boost::asio::error::operation_aborted)
|
|
Terminate ();
|
|
}
|
|
else
|
|
{
|
|
m_Decryption.Decrypt (m_ReceiveBuffer, bytes_transferred, m_ReceiveBuffer);
|
|
uint8_t * buf = m_ReceiveBuffer;
|
|
uint16_t size = bufbe16toh (buf);
|
|
SetRemoteIdentity (std::make_shared<i2p::data::IdentityEx> (buf + 2, size));
|
|
if (m_Server.FindNTCPSession (m_RemoteIdentity->GetIdentHash ()))
|
|
{
|
|
LogPrint (eLogInfo, "NTCP: session already exists");
|
|
Terminate ();
|
|
}
|
|
size_t expectedSize = size + 2/*size*/ + 4/*timestamp*/ + m_RemoteIdentity->GetSignatureLen ();
|
|
size_t paddingLen = expectedSize & 0x0F;
|
|
if (paddingLen) paddingLen = (16 - paddingLen);
|
|
if (expectedSize > NTCP_DEFAULT_PHASE3_SIZE)
|
|
{
|
|
// we need more bytes for Phase3
|
|
expectedSize += paddingLen;
|
|
boost::asio::async_read (m_Socket, boost::asio::buffer(m_ReceiveBuffer + NTCP_DEFAULT_PHASE3_SIZE, expectedSize - NTCP_DEFAULT_PHASE3_SIZE), boost::asio::transfer_all (),
|
|
std::bind(&NTCPSession::HandlePhase3ExtraReceived, shared_from_this (),
|
|
std::placeholders::_1, std::placeholders::_2, tsB, paddingLen));
|
|
}
|
|
else
|
|
HandlePhase3 (tsB, paddingLen);
|
|
}
|
|
}
|
|
|
|
void NTCPSession::HandlePhase3ExtraReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred, uint32_t tsB, size_t paddingLen)
|
|
{
|
|
if (ecode)
|
|
{
|
|
LogPrint (eLogInfo, "NTCP: Phase 3 extra read error: ", ecode.message ());
|
|
if (ecode != boost::asio::error::operation_aborted)
|
|
Terminate ();
|
|
}
|
|
else
|
|
{
|
|
m_Decryption.Decrypt (m_ReceiveBuffer + NTCP_DEFAULT_PHASE3_SIZE, bytes_transferred, m_ReceiveBuffer+ NTCP_DEFAULT_PHASE3_SIZE);
|
|
HandlePhase3 (tsB, paddingLen);
|
|
}
|
|
}
|
|
|
|
void NTCPSession::HandlePhase3 (uint32_t tsB, size_t paddingLen)
|
|
{
|
|
uint8_t * buf = m_ReceiveBuffer + m_RemoteIdentity->GetFullLen () + 2 /*size*/;
|
|
uint32_t tsA = buf32toh(buf);
|
|
buf += 4;
|
|
buf += paddingLen;
|
|
|
|
// check timestamp
|
|
auto ts = i2p::util::GetSecondsSinceEpoch ();
|
|
uint32_t tsA1 = be32toh (tsA);
|
|
if (tsA1 < ts - NTCP_CLOCK_SKEW || tsA1 > ts + NTCP_CLOCK_SKEW)
|
|
{
|
|
LogPrint (eLogError, "NTCP: Phase3 time difference ", ts - tsA1, " exceeds clock skew");
|
|
Terminate ();
|
|
return;
|
|
}
|
|
|
|
// check signature
|
|
SignedData s;
|
|
s.Insert (m_Establisher->phase1.pubKey, 256); // x
|
|
s.Insert (m_Establisher->phase2.pubKey, 256); // y
|
|
s.Insert (i2p::context.GetRouterInfo ().GetIdentHash (), 32); // ident
|
|
s.Insert (tsA); // tsA
|
|
s.Insert (tsB); // tsB
|
|
if (!s.Verify (m_RemoteIdentity, buf))
|
|
{
|
|
LogPrint (eLogError, "NTCP: signature verification failed");
|
|
Terminate ();
|
|
return;
|
|
}
|
|
|
|
SendPhase4 (tsA, tsB);
|
|
}
|
|
|
|
void NTCPSession::SendPhase4 (uint32_t tsA, uint32_t tsB)
|
|
{
|
|
SignedData s;
|
|
s.Insert (m_Establisher->phase1.pubKey, 256); // x
|
|
s.Insert (m_Establisher->phase2.pubKey, 256); // y
|
|
s.Insert (m_RemoteIdentity->GetIdentHash (), 32); // ident
|
|
s.Insert (tsA); // tsA
|
|
s.Insert (tsB); // tsB
|
|
auto keys = i2p::context.GetPrivateKeys ();
|
|
auto signatureLen = keys.GetPublic ()->GetSignatureLen ();
|
|
s.Sign (keys, m_ReceiveBuffer);
|
|
size_t paddingSize = signatureLen & 0x0F; // %16
|
|
if (paddingSize > 0) signatureLen += (16 - paddingSize);
|
|
m_Encryption.Encrypt (m_ReceiveBuffer, signatureLen, m_ReceiveBuffer);
|
|
|
|
boost::asio::async_write (m_Socket, boost::asio::buffer (m_ReceiveBuffer, signatureLen), boost::asio::transfer_all (),
|
|
std::bind(&NTCPSession::HandlePhase4Sent, shared_from_this (), std::placeholders::_1, std::placeholders::_2));
|
|
}
|
|
|
|
void NTCPSession::HandlePhase4Sent (const boost::system::error_code& ecode, std::size_t bytes_transferred)
|
|
{
|
|
(void) bytes_transferred;
|
|
if (ecode)
|
|
{
|
|
LogPrint (eLogWarning, "NTCP: Couldn't send Phase 4 message: ", ecode.message ());
|
|
if (ecode != boost::asio::error::operation_aborted)
|
|
Terminate ();
|
|
}
|
|
else
|
|
{
|
|
LogPrint (eLogDebug, "NTCP: Server session from ", m_Socket.remote_endpoint (), " connected");
|
|
m_Server.AddNTCPSession (shared_from_this ());
|
|
|
|
Connected ();
|
|
m_ReceiveBufferOffset = 0;
|
|
m_NextMessage = nullptr;
|
|
Receive ();
|
|
}
|
|
}
|
|
|
|
void NTCPSession::HandlePhase4Received (const boost::system::error_code& ecode, std::size_t bytes_transferred, uint32_t tsA)
|
|
{
|
|
if (ecode)
|
|
{
|
|
LogPrint (eLogError, "NTCP: Phase 4 read error: ", ecode.message (), ". Check your clock");
|
|
if (ecode != boost::asio::error::operation_aborted)
|
|
{
|
|
// this router doesn't like us
|
|
i2p::data::netdb.SetUnreachable (GetRemoteIdentity ()->GetIdentHash (), true);
|
|
Terminate ();
|
|
}
|
|
}
|
|
else
|
|
{
|
|
m_Decryption.Decrypt(m_ReceiveBuffer, bytes_transferred, m_ReceiveBuffer);
|
|
|
|
// check timestamp
|
|
uint32_t tsB = bufbe32toh (m_Establisher->phase2.encrypted.timestamp);
|
|
auto ts = i2p::util::GetSecondsSinceEpoch ();
|
|
if (tsB < ts - NTCP_CLOCK_SKEW || tsB > ts + NTCP_CLOCK_SKEW)
|
|
{
|
|
LogPrint (eLogError, "NTCP: Phase4 time difference ", ts - tsB, " exceeds clock skew");
|
|
Terminate ();
|
|
return;
|
|
}
|
|
|
|
// verify signature
|
|
SignedData s;
|
|
s.Insert (m_Establisher->phase1.pubKey, 256); // x
|
|
s.Insert (m_Establisher->phase2.pubKey, 256); // y
|
|
s.Insert (i2p::context.GetIdentHash (), 32); // ident
|
|
s.Insert (tsA); // tsA
|
|
s.Insert (m_Establisher->phase2.encrypted.timestamp, 4); // tsB
|
|
|
|
if (!s.Verify (m_RemoteIdentity, m_ReceiveBuffer))
|
|
{
|
|
LogPrint (eLogError, "NTCP: Phase 4 process error: signature verification failed");
|
|
Terminate ();
|
|
return;
|
|
}
|
|
LogPrint (eLogDebug, "NTCP: session to ", m_Socket.remote_endpoint (), " connected");
|
|
Connected ();
|
|
|
|
m_ReceiveBufferOffset = 0;
|
|
m_NextMessage = nullptr;
|
|
Receive ();
|
|
}
|
|
}
|
|
|
|
void NTCPSession::Receive ()
|
|
{
|
|
m_Socket.async_read_some (boost::asio::buffer(m_ReceiveBuffer + m_ReceiveBufferOffset, NTCP_BUFFER_SIZE - m_ReceiveBufferOffset),
|
|
std::bind(&NTCPSession::HandleReceived, shared_from_this (),
|
|
std::placeholders::_1, std::placeholders::_2));
|
|
}
|
|
|
|
void NTCPSession::HandleReceived (const boost::system::error_code& ecode, std::size_t bytes_transferred)
|
|
{
|
|
if (ecode) {
|
|
if (ecode != boost::asio::error::operation_aborted)
|
|
LogPrint (eLogDebug, "NTCP: Read error: ", ecode.message ());
|
|
if (!m_NumReceivedBytes)
|
|
m_Server.Ban (m_ConnectedFrom);
|
|
//if (ecode != boost::asio::error::operation_aborted)
|
|
Terminate ();
|
|
}
|
|
else
|
|
{
|
|
m_NumReceivedBytes += bytes_transferred;
|
|
i2p::transport::transports.UpdateReceivedBytes (bytes_transferred);
|
|
m_ReceiveBufferOffset += bytes_transferred;
|
|
|
|
if (m_ReceiveBufferOffset >= 16)
|
|
{
|
|
int numReloads = 0;
|
|
do
|
|
{
|
|
uint8_t * nextBlock = m_ReceiveBuffer;
|
|
while (m_ReceiveBufferOffset >= 16)
|
|
{
|
|
if (!DecryptNextBlock (nextBlock)) // 16 bytes
|
|
{
|
|
Terminate ();
|
|
return;
|
|
}
|
|
nextBlock += 16;
|
|
m_ReceiveBufferOffset -= 16;
|
|
}
|
|
if (m_ReceiveBufferOffset > 0)
|
|
memcpy (m_ReceiveBuffer, nextBlock, m_ReceiveBufferOffset);
|
|
|
|
// try to read more
|
|
if (numReloads < 5)
|
|
{
|
|
boost::system::error_code ec;
|
|
size_t moreBytes = m_Socket.available(ec);
|
|
if (moreBytes)
|
|
{
|
|
if (moreBytes > NTCP_BUFFER_SIZE - m_ReceiveBufferOffset)
|
|
moreBytes = NTCP_BUFFER_SIZE - m_ReceiveBufferOffset;
|
|
moreBytes = m_Socket.read_some (boost::asio::buffer (m_ReceiveBuffer + m_ReceiveBufferOffset, moreBytes));
|
|
if (ec)
|
|
{
|
|
LogPrint (eLogInfo, "NTCP: Read more bytes error: ", ec.message ());
|
|
Terminate ();
|
|
return;
|
|
}
|
|
m_NumReceivedBytes += moreBytes;
|
|
m_ReceiveBufferOffset += moreBytes;
|
|
numReloads++;
|
|
}
|
|
}
|
|
}
|
|
while (m_ReceiveBufferOffset >= 16);
|
|
m_Handler.Flush ();
|
|
}
|
|
|
|
m_LastActivityTimestamp = i2p::util::GetSecondsSinceEpoch ();
|
|
Receive ();
|
|
}
|
|
}
|
|
|
|
bool NTCPSession::DecryptNextBlock (const uint8_t * encrypted) // 16 bytes
|
|
{
|
|
if (!m_NextMessage) // new message, header expected
|
|
{
|
|
// decrypt header and extract length
|
|
uint8_t buf[16];
|
|
m_Decryption.Decrypt (encrypted, buf);
|
|
uint16_t dataSize = bufbe16toh (buf);
|
|
if (dataSize)
|
|
{
|
|
// new message
|
|
if (dataSize + 16U > NTCP_MAX_MESSAGE_SIZE - 2) // + 6 + padding
|
|
{
|
|
LogPrint (eLogError, "NTCP: data size ", dataSize, " exceeds max size");
|
|
return false;
|
|
}
|
|
auto msg = (dataSize + 16U) <= I2NP_MAX_SHORT_MESSAGE_SIZE - 2 ? NewI2NPShortMessage () : NewI2NPMessage ();
|
|
m_NextMessage = msg;
|
|
memcpy (m_NextMessage->buf, buf, 16);
|
|
m_NextMessageOffset = 16;
|
|
m_NextMessage->offset = 2; // size field
|
|
m_NextMessage->len = dataSize + 2;
|
|
}
|
|
else
|
|
{
|
|
// timestamp
|
|
LogPrint (eLogDebug, "NTCP: Timestamp");
|
|
return true;
|
|
}
|
|
}
|
|
else // message continues
|
|
{
|
|
m_Decryption.Decrypt (encrypted, m_NextMessage->buf + m_NextMessageOffset);
|
|
m_NextMessageOffset += 16;
|
|
}
|
|
|
|
if (m_NextMessageOffset >= m_NextMessage->len + 4) // +checksum
|
|
{
|
|
// we have a complete I2NP message
|
|
uint8_t checksum[4];
|
|
htobe32buf (checksum, adler32 (adler32 (0, Z_NULL, 0), m_NextMessage->buf, m_NextMessageOffset - 4));
|
|
if (!memcmp (m_NextMessage->buf + m_NextMessageOffset - 4, checksum, 4))
|
|
{
|
|
if (!m_NextMessage->IsExpired ())
|
|
{
|
|
#ifdef WITH_EVENTS
|
|
EmitEvent({{"type", "transport.recvmsg"} , {"ident", GetIdentHashBase64()}, {"number", "1"}});
|
|
#endif
|
|
m_Handler.PutNextMessage (m_NextMessage);
|
|
}
|
|
else
|
|
LogPrint (eLogInfo, "NTCP: message expired");
|
|
}
|
|
else
|
|
LogPrint (eLogWarning, "NTCP: Incorrect adler checksum of message, dropped");
|
|
m_NextMessage = nullptr;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
void NTCPSession::Send (std::shared_ptr<i2p::I2NPMessage> msg)
|
|
{
|
|
m_IsSending = true;
|
|
boost::asio::async_write (m_Socket, CreateMsgBuffer (msg), boost::asio::transfer_all (),
|
|
std::bind(&NTCPSession::HandleSent, shared_from_this (), std::placeholders::_1, std::placeholders::_2, std::vector<std::shared_ptr<I2NPMessage> >{ msg }));
|
|
}
|
|
|
|
boost::asio::const_buffers_1 NTCPSession::CreateMsgBuffer (std::shared_ptr<I2NPMessage> msg)
|
|
{
|
|
uint8_t * sendBuffer;
|
|
int len;
|
|
|
|
if (msg)
|
|
{
|
|
// regular I2NP
|
|
if (msg->offset < 2)
|
|
LogPrint (eLogError, "NTCP: Malformed I2NP message"); // TODO:
|
|
sendBuffer = msg->GetBuffer () - 2;
|
|
len = msg->GetLength ();
|
|
htobe16buf (sendBuffer, len);
|
|
}
|
|
else
|
|
{
|
|
// prepare timestamp
|
|
sendBuffer = m_TimeSyncBuffer;
|
|
len = 4;
|
|
htobuf16(sendBuffer, 0);
|
|
htobe32buf (sendBuffer + 2, time (0));
|
|
}
|
|
int rem = (len + 6) & 0x0F; // %16
|
|
int padding = 0;
|
|
if (rem > 0) {
|
|
padding = 16 - rem;
|
|
// fill with random padding
|
|
RAND_bytes(sendBuffer + len + 2, padding);
|
|
}
|
|
htobe32buf (sendBuffer + len + 2 + padding, adler32 (adler32 (0, Z_NULL, 0), sendBuffer, len + 2+ padding));
|
|
|
|
int l = len + padding + 6;
|
|
m_Encryption.Encrypt(sendBuffer, l, sendBuffer);
|
|
return boost::asio::buffer ((const uint8_t *)sendBuffer, l);
|
|
}
|
|
|
|
|
|
void NTCPSession::Send (const std::vector<std::shared_ptr<I2NPMessage> >& msgs)
|
|
{
|
|
m_IsSending = true;
|
|
std::vector<boost::asio::const_buffer> bufs;
|
|
for (const auto& it: msgs)
|
|
bufs.push_back (CreateMsgBuffer (it));
|
|
boost::asio::async_write (m_Socket, bufs, boost::asio::transfer_all (),
|
|
std::bind(&NTCPSession::HandleSent, shared_from_this (), std::placeholders::_1, std::placeholders::_2, msgs));
|
|
}
|
|
|
|
void NTCPSession::HandleSent (const boost::system::error_code& ecode, std::size_t bytes_transferred, std::vector<std::shared_ptr<I2NPMessage> > msgs)
|
|
{
|
|
(void) msgs;
|
|
m_IsSending = false;
|
|
if (ecode)
|
|
{
|
|
LogPrint (eLogWarning, "NTCP: Couldn't send msgs: ", 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_LastActivityTimestamp = i2p::util::GetSecondsSinceEpoch ();
|
|
m_NumSentBytes += bytes_transferred;
|
|
i2p::transport::transports.UpdateSentBytes (bytes_transferred);
|
|
if (!m_SendQueue.empty())
|
|
{
|
|
Send (m_SendQueue);
|
|
m_SendQueue.clear ();
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void NTCPSession::SendTimeSyncMessage ()
|
|
{
|
|
Send (nullptr);
|
|
}
|
|
|
|
|
|
void NTCPSession::SendI2NPMessages (const std::vector<std::shared_ptr<I2NPMessage> >& msgs)
|
|
{
|
|
m_Server.GetService ().post (std::bind (&NTCPSession::PostI2NPMessages, shared_from_this (), msgs));
|
|
}
|
|
|
|
void NTCPSession::PostI2NPMessages (std::vector<std::shared_ptr<I2NPMessage> > msgs)
|
|
{
|
|
if (m_IsTerminated) return;
|
|
if (m_IsSending)
|
|
{
|
|
if (m_SendQueue.size () < NTCP_MAX_OUTGOING_QUEUE_SIZE)
|
|
{
|
|
for (const auto& it: msgs)
|
|
m_SendQueue.push_back (it);
|
|
}
|
|
else
|
|
{
|
|
LogPrint (eLogWarning, "NTCP: outgoing messages queue size exceeds ", NTCP_MAX_OUTGOING_QUEUE_SIZE);
|
|
Terminate ();
|
|
}
|
|
}
|
|
else
|
|
Send (msgs);
|
|
}
|
|
|
|
//-----------------------------------------
|
|
NTCPServer::NTCPServer ():
|
|
m_IsRunning (false), m_Thread (nullptr), m_Work (m_Service),
|
|
m_TerminationTimer (m_Service), m_NTCPAcceptor (nullptr), m_NTCPV6Acceptor (nullptr)
|
|
{
|
|
}
|
|
|
|
NTCPServer::~NTCPServer ()
|
|
{
|
|
Stop ();
|
|
}
|
|
|
|
void NTCPServer::Start ()
|
|
{
|
|
if (!m_IsRunning)
|
|
{
|
|
m_IsRunning = true;
|
|
m_Thread = new std::thread (std::bind (&NTCPServer::Run, this));
|
|
// create acceptors
|
|
auto& addresses = context.GetRouterInfo ().GetAddresses ();
|
|
for (const auto& address: addresses)
|
|
{
|
|
if (!address) continue;
|
|
if (address->transportStyle == i2p::data::RouterInfo::eTransportNTCP)
|
|
{
|
|
if (address->host.is_v4())
|
|
{
|
|
try
|
|
{
|
|
m_NTCPAcceptor = new boost::asio::ip::tcp::acceptor (m_Service,
|
|
boost::asio::ip::tcp::endpoint(boost::asio::ip::tcp::v4(), address->port));
|
|
} catch ( std::exception & ex ) {
|
|
/** fail to bind ip4 */
|
|
LogPrint(eLogError, "NTCP: Failed to bind to ip4 port ",address->port, ex.what());
|
|
continue;
|
|
}
|
|
|
|
LogPrint (eLogInfo, "NTCP: Start listening TCP port ", address->port);
|
|
auto conn = std::make_shared<NTCPSession>(*this);
|
|
m_NTCPAcceptor->async_accept(conn->GetSocket (), std::bind (&NTCPServer::HandleAccept, this,
|
|
conn, std::placeholders::_1));
|
|
}
|
|
else if (address->host.is_v6() && context.SupportsV6 ())
|
|
{
|
|
m_NTCPV6Acceptor = new boost::asio::ip::tcp::acceptor (m_Service);
|
|
try
|
|
{
|
|
m_NTCPV6Acceptor->open (boost::asio::ip::tcp::v6());
|
|
m_NTCPV6Acceptor->set_option (boost::asio::ip::v6_only (true));
|
|
|
|
m_NTCPV6Acceptor->bind (boost::asio::ip::tcp::endpoint(boost::asio::ip::tcp::v6(), address->port));
|
|
m_NTCPV6Acceptor->listen ();
|
|
|
|
LogPrint (eLogInfo, "NTCP: Start listening V6 TCP port ", address->port);
|
|
auto conn = std::make_shared<NTCPSession> (*this);
|
|
m_NTCPV6Acceptor->async_accept(conn->GetSocket (), std::bind (&NTCPServer::HandleAcceptV6,
|
|
this, conn, std::placeholders::_1));
|
|
} catch ( std::exception & ex ) {
|
|
LogPrint(eLogError, "NTCP: failed to bind to ip6 port ", address->port);
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
ScheduleTermination ();
|
|
}
|
|
}
|
|
|
|
void NTCPServer::Stop ()
|
|
{
|
|
m_NTCPSessions.clear ();
|
|
|
|
if (m_IsRunning)
|
|
{
|
|
m_IsRunning = false;
|
|
m_TerminationTimer.cancel ();
|
|
if (m_NTCPAcceptor)
|
|
{
|
|
delete m_NTCPAcceptor;
|
|
m_NTCPAcceptor = nullptr;
|
|
}
|
|
if (m_NTCPV6Acceptor)
|
|
{
|
|
delete m_NTCPV6Acceptor;
|
|
m_NTCPV6Acceptor = nullptr;
|
|
}
|
|
m_Service.stop ();
|
|
if (m_Thread)
|
|
{
|
|
m_Thread->join ();
|
|
delete m_Thread;
|
|
m_Thread = nullptr;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void NTCPServer::Run ()
|
|
{
|
|
while (m_IsRunning)
|
|
{
|
|
try
|
|
{
|
|
m_Service.run ();
|
|
}
|
|
catch (std::exception& ex)
|
|
{
|
|
LogPrint (eLogError, "NTCP: runtime exception: ", ex.what ());
|
|
}
|
|
}
|
|
}
|
|
|
|
bool NTCPServer::AddNTCPSession (std::shared_ptr<NTCPSession> session)
|
|
{
|
|
if (!session || !session->GetRemoteIdentity ()) return false;
|
|
auto& ident = session->GetRemoteIdentity ()->GetIdentHash ();
|
|
auto it = m_NTCPSessions.find (ident);
|
|
if (it != m_NTCPSessions.end ())
|
|
{
|
|
LogPrint (eLogWarning, "NTCP: session to ", ident.ToBase64 (), " already exists");
|
|
session->Terminate();
|
|
return false;
|
|
}
|
|
m_NTCPSessions.insert (std::pair<i2p::data::IdentHash, std::shared_ptr<NTCPSession> >(ident, session));
|
|
return true;
|
|
}
|
|
|
|
void NTCPServer::RemoveNTCPSession (std::shared_ptr<NTCPSession> session)
|
|
{
|
|
if (session && session->GetRemoteIdentity ())
|
|
m_NTCPSessions.erase (session->GetRemoteIdentity ()->GetIdentHash ());
|
|
}
|
|
|
|
std::shared_ptr<NTCPSession> NTCPServer::FindNTCPSession (const i2p::data::IdentHash& ident)
|
|
{
|
|
auto it = m_NTCPSessions.find (ident);
|
|
if (it != m_NTCPSessions.end ())
|
|
return it->second;
|
|
return nullptr;
|
|
}
|
|
|
|
void NTCPServer::HandleAccept (std::shared_ptr<NTCPSession> 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, "NTCP: Connected from ", ep);
|
|
auto it = m_BanList.find (ep.address ());
|
|
if (it != m_BanList.end ())
|
|
{
|
|
uint32_t ts = i2p::util::GetSecondsSinceEpoch ();
|
|
if (ts < it->second)
|
|
{
|
|
LogPrint (eLogWarning, "NTCP: ", ep.address (), " is banned for ", it->second - ts, " more seconds");
|
|
conn = nullptr;
|
|
}
|
|
else
|
|
m_BanList.erase (it);
|
|
}
|
|
if (conn)
|
|
conn->ServerLogin ();
|
|
}
|
|
else
|
|
LogPrint (eLogError, "NTCP: Connected from error ", ec.message ());
|
|
}
|
|
|
|
|
|
if (error != boost::asio::error::operation_aborted)
|
|
{
|
|
conn = std::make_shared<NTCPSession> (*this);
|
|
m_NTCPAcceptor->async_accept(conn->GetSocket (), std::bind (&NTCPServer::HandleAccept, this,
|
|
conn, std::placeholders::_1));
|
|
}
|
|
}
|
|
|
|
void NTCPServer::HandleAcceptV6 (std::shared_ptr<NTCPSession> 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, "NTCP: Connected from ", ep);
|
|
auto it = m_BanList.find (ep.address ());
|
|
if (it != m_BanList.end ())
|
|
{
|
|
uint32_t ts = i2p::util::GetSecondsSinceEpoch ();
|
|
if (ts < it->second)
|
|
{
|
|
LogPrint (eLogWarning, "NTCP: ", ep.address (), " is banned for ", it->second - ts, " more seconds");
|
|
conn = nullptr;
|
|
}
|
|
else
|
|
m_BanList.erase (it);
|
|
}
|
|
if (conn)
|
|
conn->ServerLogin ();
|
|
}
|
|
else
|
|
LogPrint (eLogError, "NTCP: Connected from error ", ec.message ());
|
|
}
|
|
|
|
if (error != boost::asio::error::operation_aborted)
|
|
{
|
|
conn = std::make_shared<NTCPSession> (*this);
|
|
m_NTCPV6Acceptor->async_accept(conn->GetSocket (), std::bind (&NTCPServer::HandleAcceptV6, this,
|
|
conn, std::placeholders::_1));
|
|
}
|
|
}
|
|
|
|
void NTCPServer::Connect (const boost::asio::ip::address& address, int port, std::shared_ptr<NTCPSession> conn)
|
|
{
|
|
LogPrint (eLogDebug, "NTCP: Connecting to ", address ,":", port);
|
|
m_Service.post([=]()
|
|
{
|
|
if (this->AddNTCPSession (conn))
|
|
conn->GetSocket ().async_connect (boost::asio::ip::tcp::endpoint (address, port),
|
|
std::bind (&NTCPServer::HandleConnect, this, std::placeholders::_1, conn));
|
|
});
|
|
}
|
|
|
|
void NTCPServer::HandleConnect (const boost::system::error_code& ecode, std::shared_ptr<NTCPSession> conn)
|
|
{
|
|
if (ecode)
|
|
{
|
|
LogPrint (eLogError, "NTCP: Connect error ", ecode.message ());
|
|
if (ecode != boost::asio::error::operation_aborted)
|
|
i2p::data::netdb.SetUnreachable (conn->GetRemoteIdentity ()->GetIdentHash (), true);
|
|
conn->Terminate ();
|
|
}
|
|
else
|
|
{
|
|
LogPrint (eLogDebug, "NTCP: Connected to ", conn->GetSocket ().remote_endpoint ());
|
|
if (conn->GetSocket ().local_endpoint ().protocol () == boost::asio::ip::tcp::v6()) // ipv6
|
|
context.UpdateNTCPV6Address (conn->GetSocket ().local_endpoint ().address ());
|
|
conn->ClientLogin ();
|
|
}
|
|
}
|
|
|
|
void NTCPServer::Ban (const boost::asio::ip::address& addr)
|
|
{
|
|
uint32_t ts = i2p::util::GetSecondsSinceEpoch ();
|
|
m_BanList[addr] = ts + NTCP_BAN_EXPIRATION_TIMEOUT;
|
|
LogPrint (eLogWarning, "NTCP: ", addr, " has been banned for ", NTCP_BAN_EXPIRATION_TIMEOUT, " seconds");
|
|
}
|
|
|
|
void NTCPServer::ScheduleTermination ()
|
|
{
|
|
m_TerminationTimer.expires_from_now (boost::posix_time::seconds(NTCP_TERMINATION_CHECK_TIMEOUT));
|
|
m_TerminationTimer.async_wait (std::bind (&NTCPServer::HandleTerminationTimer,
|
|
this, std::placeholders::_1));
|
|
}
|
|
|
|
void NTCPServer::HandleTerminationTimer (const boost::system::error_code& ecode)
|
|
{
|
|
if (ecode != boost::asio::error::operation_aborted)
|
|
{
|
|
auto ts = i2p::util::GetSecondsSinceEpoch ();
|
|
for (auto& it: m_NTCPSessions)
|
|
if (it.second->IsTerminationTimeoutExpired (ts))
|
|
{
|
|
auto session = it.second;
|
|
m_Service.post ([session]
|
|
{
|
|
LogPrint (eLogDebug, "NTCP: No activity for ", session->GetTerminationTimeout (), " seconds");
|
|
session->Terminate ();
|
|
});
|
|
}
|
|
ScheduleTermination ();
|
|
}
|
|
}
|
|
}
|
|
}
|