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296 lines
9.6 KiB
296 lines
9.6 KiB
/*
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This file is part of cpp-ethereum.
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cpp-ethereum is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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cpp-ethereum is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file RLPXHandshake.cpp
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* @author Alex Leverington <nessence@gmail.com>
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* @date 2015
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*/
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#include "Host.h"
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#include "Session.h"
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#include "Peer.h"
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#include "RLPxHandshake.h"
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using namespace std;
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using namespace dev;
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using namespace dev::p2p;
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using namespace CryptoPP;
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void RLPXHandshake::writeAuth()
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{
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clog(NetP2PConnect) << "p2p.connect.egress sending auth to " << m_socket->remoteEndpoint();
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m_auth.resize(Signature::size + h256::size + Public::size + h256::size + 1);
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bytesRef sig(&m_auth[0], Signature::size);
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bytesRef hepubk(&m_auth[Signature::size], h256::size);
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bytesRef pubk(&m_auth[Signature::size + h256::size], Public::size);
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bytesRef nonce(&m_auth[Signature::size + h256::size + Public::size], h256::size);
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// E(remote-pubk, S(ecdhe-random, ecdh-shared-secret^nonce) || H(ecdhe-random-pubk) || pubk || nonce || 0x0)
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Secret staticShared;
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crypto::ecdh::agree(m_host->m_alias.sec(), m_remote, staticShared);
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sign(m_ecdhe.seckey(), staticShared ^ m_nonce).ref().copyTo(sig);
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sha3(m_ecdhe.pubkey().ref(), hepubk);
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m_host->m_alias.pub().ref().copyTo(pubk);
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m_nonce.ref().copyTo(nonce);
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m_auth[m_auth.size() - 1] = 0x0;
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encryptECIES(m_remote, &m_auth, m_authCipher);
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auto self(shared_from_this());
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ba::async_write(m_socket->ref(), ba::buffer(m_authCipher), [this, self](boost::system::error_code ec, std::size_t)
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{
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transition(ec);
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});
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}
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void RLPXHandshake::writeAck()
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{
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clog(NetP2PConnect) << "p2p.connect.ingress sending ack to " << m_socket->remoteEndpoint();
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m_ack.resize(Public::size + h256::size + 1);
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bytesRef epubk(&m_ack[0], Public::size);
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bytesRef nonce(&m_ack[Public::size], h256::size);
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m_ecdhe.pubkey().ref().copyTo(epubk);
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m_nonce.ref().copyTo(nonce);
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m_ack[m_ack.size() - 1] = 0x0;
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encryptECIES(m_remote, &m_ack, m_ackCipher);
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auto self(shared_from_this());
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ba::async_write(m_socket->ref(), ba::buffer(m_ackCipher), [this, self](boost::system::error_code ec, std::size_t)
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{
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transition(ec);
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});
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}
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void RLPXHandshake::readAuth()
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{
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clog(NetP2PConnect) << "p2p.connect.ingress recving auth from " << m_socket->remoteEndpoint();
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m_authCipher.resize(307);
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auto self(shared_from_this());
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ba::async_read(m_socket->ref(), ba::buffer(m_authCipher, 307), [this, self](boost::system::error_code ec, std::size_t)
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{
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if (ec)
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transition(ec);
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else if (decryptECIES(m_host->m_alias.sec(), bytesConstRef(&m_authCipher), m_auth))
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{
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bytesConstRef sig(&m_auth[0], Signature::size);
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bytesConstRef hepubk(&m_auth[Signature::size], h256::size);
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bytesConstRef pubk(&m_auth[Signature::size + h256::size], Public::size);
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bytesConstRef nonce(&m_auth[Signature::size + h256::size + Public::size], h256::size);
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pubk.copyTo(m_remote.ref());
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nonce.copyTo(m_remoteNonce.ref());
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Secret sharedSecret;
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crypto::ecdh::agree(m_host->m_alias.sec(), m_remote, sharedSecret);
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m_remoteEphemeral = recover(*(Signature*)sig.data(), sharedSecret ^ m_remoteNonce);
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if (sha3(m_remoteEphemeral) != *(h256*)hepubk.data())
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clog(NetP2PConnect) << "p2p.connect.ingress auth failed (invalid: hash mismatch) for" << m_socket->remoteEndpoint();
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transition();
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}
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else
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{
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clog(NetP2PConnect) << "p2p.connect.ingress recving auth decrypt failed for" << m_socket->remoteEndpoint();
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m_nextState = Error;
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transition();
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}
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});
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}
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void RLPXHandshake::readAck()
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{
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clog(NetP2PConnect) << "p2p.connect.egress recving ack from " << m_socket->remoteEndpoint();
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m_ackCipher.resize(210);
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auto self(shared_from_this());
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ba::async_read(m_socket->ref(), ba::buffer(m_ackCipher, 210), [this, self](boost::system::error_code ec, std::size_t)
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{
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if (ec)
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transition(ec);
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else if (decryptECIES(m_host->m_alias.sec(), bytesConstRef(&m_ackCipher), m_ack))
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{
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bytesConstRef(&m_ack).cropped(0, Public::size).copyTo(m_remoteEphemeral.ref());
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bytesConstRef(&m_ack).cropped(Public::size, h256::size).copyTo(m_remoteNonce.ref());
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transition();
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}
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else
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{
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clog(NetP2PConnect) << "p2p.connect.egress recving ack decrypt failed for " << m_socket->remoteEndpoint();
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m_nextState = Error;
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transition();
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}
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});
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}
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void RLPXHandshake::error()
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{
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m_idleTimer.cancel();
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auto connected = m_socket->isConnected();
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if (connected && !m_socket->remoteEndpoint().address().is_unspecified())
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clog(NetP2PConnect) << "Disconnecting " << m_socket->remoteEndpoint() << " (Handshake Failed)";
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else
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clog(NetP2PConnect) << "Handshake Failed (Connection reset by peer)";
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m_socket->close();
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if (m_io != nullptr)
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delete m_io;
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}
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void RLPXHandshake::transition(boost::system::error_code _ech)
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{
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if (_ech || m_nextState == Error || m_cancel)
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{
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clog(NetP2PConnect) << "Handshake Failed (I/O Error:" << _ech.message() << ")";
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return error();
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}
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auto self(shared_from_this());
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if (m_nextState == New)
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{
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m_nextState = AckAuth;
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if (m_originated)
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writeAuth();
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else
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readAuth();
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}
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else if (m_nextState == AckAuth)
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{
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m_nextState = WriteHello;
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if (m_originated)
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readAck();
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else
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writeAck();
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}
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else if (m_nextState == WriteHello)
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{
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m_nextState = ReadHello;
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clog(NetP2PConnect) << (m_originated ? "p2p.connect.egress" : "p2p.connect.ingress") << "sending capabilities handshake";
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/// This pointer will be freed if there is an error otherwise
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/// it will be passed to Host which will take ownership.
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m_io = new RLPXFrameIO(*this);
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// old packet format
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// 5 arguments, HelloPacket
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RLPStream s;
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s.append((unsigned)HelloPacket).appendList(5)
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<< dev::p2p::c_protocolVersion
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<< m_host->m_clientVersion
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<< m_host->caps()
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<< m_host->listenPort()
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<< m_host->id();
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bytes packet;
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s.swapOut(packet);
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m_io->writeSingleFramePacket(&packet, m_handshakeOutBuffer);
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ba::async_write(m_socket->ref(), ba::buffer(m_handshakeOutBuffer), [this, self](boost::system::error_code ec, std::size_t)
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{
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transition(ec);
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});
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}
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else if (m_nextState == ReadHello)
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{
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// Authenticate and decrypt initial hello frame with initial RLPXFrameIO
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// and request m_host to start session.
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m_nextState = StartSession;
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// read frame header
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unsigned const handshakeSize = 32;
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m_handshakeInBuffer.resize(handshakeSize);
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ba::async_read(m_socket->ref(), boost::asio::buffer(m_handshakeInBuffer, handshakeSize), [this, self](boost::system::error_code ec, std::size_t)
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{
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if (ec)
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transition(ec);
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else
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{
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/// authenticate and decrypt header
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if (!m_io->authAndDecryptHeader(bytesRef(m_handshakeInBuffer.data(), m_handshakeInBuffer.size())))
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{
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m_nextState = Error;
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transition();
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return;
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}
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clog(NetP2PNote) << (m_originated ? "p2p.connect.egress" : "p2p.connect.ingress") << "recvd hello header";
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/// check frame size
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bytes& header = m_handshakeInBuffer;
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uint32_t frameSize = (uint32_t)(header[2]) | (uint32_t)(header[1])<<8 | (uint32_t)(header[0])<<16;
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if (frameSize > 1024)
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{
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// all future frames: 16777216
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clog(NetP2PWarn) << (m_originated ? "p2p.connect.egress" : "p2p.connect.ingress") << "hello frame is too large" << frameSize;
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m_nextState = Error;
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transition();
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return;
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}
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/// rlp of header has protocol-type, sequence-id[, total-packet-size]
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bytes headerRLP(header.size() - 3 - h128::size); // this is always 32 - 3 - 16 = 13. wtf?
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bytesConstRef(&header).cropped(3).copyTo(&headerRLP);
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/// read padded frame and mac
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m_handshakeInBuffer.resize(frameSize + ((16 - (frameSize % 16)) % 16) + h128::size);
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ba::async_read(m_socket->ref(), boost::asio::buffer(m_handshakeInBuffer, m_handshakeInBuffer.size()), [this, self, headerRLP](boost::system::error_code ec, std::size_t)
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{
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if (ec)
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transition(ec);
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else
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{
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bytesRef frame(&m_handshakeInBuffer);
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if (!m_io->authAndDecryptFrame(frame))
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{
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clog(NetTriviaSummary) << (m_originated ? "p2p.connect.egress" : "p2p.connect.ingress") << "hello frame: decrypt failed";
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m_nextState = Error;
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transition();
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return;
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}
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PacketType packetType = frame[0] == 0x80 ? HelloPacket : (PacketType)frame[0];
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if (packetType != HelloPacket)
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{
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clog(NetTriviaSummary) << (m_originated ? "p2p.connect.egress" : "p2p.connect.ingress") << "hello frame: invalid packet type";
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m_nextState = Error;
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transition();
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return;
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}
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clog(NetTriviaSummary) << (m_originated ? "p2p.connect.egress" : "p2p.connect.ingress") << "hello frame: success. starting session.";
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try
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{
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RLP rlp(frame.cropped(1), RLP::ThrowOnFail | RLP::FailIfTooSmall);
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m_host->startPeerSession(m_remote, rlp, m_io, m_socket->remoteEndpoint());
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}
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catch (std::exception const& _e)
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{
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clog(NetWarn) << "Handshake causing an exception:" << _e.what();
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m_nextState = Error;
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transition();
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}
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}
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});
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}
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});
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}
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m_idleTimer.expires_from_now(c_timeout);
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m_idleTimer.async_wait([this, self](boost::system::error_code const& _ec)
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{
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if (!_ec)
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{
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if (!m_socket->remoteEndpoint().address().is_unspecified())
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clog(NetP2PConnect) << "Disconnecting " << m_socket->remoteEndpoint() << " (Handshake Timeout)";
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cancel();
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}
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});
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}
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