subtly
10 years ago
8 changed files with 348 additions and 276 deletions
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/*
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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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|
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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 RLPXFrameIO.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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#include "RLPxFrameIO.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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RLPXFrameIO::RLPXFrameIO(RLPXHandshake const& _init): m_socket(_init.m_socket) |
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{ |
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// we need:
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// originated?
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// Secret == output of ecdhe agreement
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// authCipher
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// ackCipher
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bytes keyMaterialBytes(64); |
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bytesRef keyMaterial(&keyMaterialBytes); |
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// shared-secret = sha3(ecdhe-shared-secret || sha3(nonce || initiator-nonce))
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Secret ephemeralShared; |
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_init.m_ecdhe.agree(_init.m_remoteEphemeral, ephemeralShared); |
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ephemeralShared.ref().copyTo(keyMaterial.cropped(0, h256::size)); |
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h512 nonceMaterial; |
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h256 const& leftNonce = _init.m_originated ? _init.m_remoteNonce : _init.m_nonce; |
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h256 const& rightNonce = _init.m_originated ? _init.m_nonce : _init.m_remoteNonce; |
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leftNonce.ref().copyTo(nonceMaterial.ref().cropped(0, h256::size)); |
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rightNonce.ref().copyTo(nonceMaterial.ref().cropped(h256::size, h256::size)); |
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auto outRef(keyMaterial.cropped(h256::size, h256::size)); |
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sha3(nonceMaterial.ref(), outRef); // output h(nonces)
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sha3(keyMaterial, outRef); // output shared-secret
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// token: sha3(outRef, bytesRef(&token)); -> m_host (to be saved to disk)
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// aes-secret = sha3(ecdhe-shared-secret || shared-secret)
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sha3(keyMaterial, outRef); // output aes-secret
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m_frameEnc.SetKeyWithIV(outRef.data(), h128::size, h128().data()); |
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m_frameDec.SetKeyWithIV(outRef.data(), h128::size, h128().data()); |
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// mac-secret = sha3(ecdhe-shared-secret || aes-secret)
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sha3(keyMaterial, outRef); // output mac-secret
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m_macEnc.SetKey(outRef.data(), h128::size); |
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// Initiator egress-mac: sha3(mac-secret^recipient-nonce || auth-sent-init)
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// ingress-mac: sha3(mac-secret^initiator-nonce || auth-recvd-ack)
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// Recipient egress-mac: sha3(mac-secret^initiator-nonce || auth-sent-ack)
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// ingress-mac: sha3(mac-secret^recipient-nonce || auth-recvd-init)
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(*(h256*)outRef.data() ^ _init.m_remoteNonce).ref().copyTo(keyMaterial); |
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bytes const& egressCipher = _init.m_originated ? _init.m_authCipher : _init.m_ackCipher; |
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keyMaterialBytes.resize(h256::size + egressCipher.size()); |
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keyMaterial.retarget(keyMaterialBytes.data(), keyMaterialBytes.size()); |
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bytesConstRef(&egressCipher).copyTo(keyMaterial.cropped(h256::size, egressCipher.size())); |
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m_egressMac.Update(keyMaterial.data(), keyMaterial.size()); |
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// recover mac-secret by re-xoring remoteNonce
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(*(h256*)keyMaterial.data() ^ _init.m_remoteNonce ^ _init.m_nonce).ref().copyTo(keyMaterial); |
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bytes const& ingressCipher = _init.m_originated ? _init.m_ackCipher : _init.m_authCipher; |
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keyMaterialBytes.resize(h256::size + ingressCipher.size()); |
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keyMaterial.retarget(keyMaterialBytes.data(), keyMaterialBytes.size()); |
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bytesConstRef(&ingressCipher).copyTo(keyMaterial.cropped(h256::size, ingressCipher.size())); |
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m_ingressMac.Update(keyMaterial.data(), keyMaterial.size()); |
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} |
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void RLPXFrameIO::writeSingleFramePacket(bytesConstRef _packet, bytes& o_bytes) |
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{ |
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// _packet = type || rlpList()
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// current/old packet format: prep(_s).appendList(_args + 1).append((unsigned)_id);
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RLPStream header; |
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header.appendRaw(bytes({byte(_packet.size() >> 16), byte(_packet.size() >> 8), byte(_packet.size())})); |
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// zeroHeader: []byte{0xC2, 0x80, 0x80}. Should be rlpList(protocolType,seqId,totalPacketSize).
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header.appendRaw(bytes({0xc2,0x80,0x80})); |
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// TODO: SECURITY check that header is <= 16 bytes
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bytes headerWithMac; |
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header.swapOut(headerWithMac); |
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headerWithMac.resize(32); |
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m_frameEnc.ProcessData(headerWithMac.data(), headerWithMac.data(), 16); |
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updateEgressMACWithHeader(bytesConstRef(&headerWithMac).cropped(0, 16)); |
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egressDigest().ref().copyTo(bytesRef(&headerWithMac).cropped(h128::size,h128::size)); |
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auto padding = (16 - (_packet.size() % 16)) % 16; |
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o_bytes.swap(headerWithMac); |
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o_bytes.resize(32 + _packet.size() + padding + h128::size); |
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bytesRef packetRef(o_bytes.data() + 32, _packet.size()); |
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m_frameEnc.ProcessData(packetRef.data(), _packet.data(), _packet.size()); |
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bytesRef paddingRef(o_bytes.data() + 32 + _packet.size(), padding); |
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if (padding) |
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m_frameEnc.ProcessData(paddingRef.data(), paddingRef.data(), padding); |
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bytesRef packetWithPaddingRef(o_bytes.data() + 32, _packet.size() + padding); |
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updateEgressMACWithEndOfFrame(packetWithPaddingRef); |
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bytesRef macRef(o_bytes.data() + 32 + _packet.size() + padding, h128::size); |
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egressDigest().ref().copyTo(macRef); |
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clog(NetConnect) << "SENT FRAME " << _packet.size() << *(h128*)macRef.data(); |
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clog(NetConnect) << "FRAME TAIL " << *(h128*)(o_bytes.data() + 32 + _packet.size() + padding); |
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} |
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bool RLPXFrameIO::authAndDecryptHeader(h256& io) |
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{ |
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updateIngressMACWithHeader(io.ref()); |
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bytesConstRef macRef = io.ref().cropped(h128::size, h128::size); |
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if (*(h128*)macRef.data() != ingressDigest()) |
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return false; |
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m_frameDec.ProcessData(io.data(), io.data(), 16); |
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return true; |
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} |
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bool RLPXFrameIO::authAndDecryptFrame(bytesRef io) |
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{ |
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bytesRef cipherText(io.cropped(0, io.size() - h128::size)); |
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updateIngressMACWithEndOfFrame(cipherText); |
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bytesConstRef frameMac(io.data() + io.size() - h128::size, h128::size); |
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if (*(h128*)frameMac.data() != ingressDigest()) |
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return false; |
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m_frameDec.ProcessData(io.data(), io.data(), io.size() - h128::size); |
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return true; |
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} |
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h128 RLPXFrameIO::egressDigest() |
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{ |
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SHA3_256 h(m_egressMac); |
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h128 digest; |
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h.TruncatedFinal(digest.data(), h128::size); |
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return move(digest); |
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} |
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h128 RLPXFrameIO::ingressDigest() |
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{ |
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SHA3_256 h(m_ingressMac); |
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h128 digest; |
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h.TruncatedFinal(digest.data(), h128::size); |
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return move(digest); |
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} |
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void RLPXFrameIO::updateEgressMACWithHeader(bytesConstRef _headerCipher) |
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{ |
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updateMAC(m_egressMac, *(h128*)_headerCipher.data()); |
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} |
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void RLPXFrameIO::updateEgressMACWithEndOfFrame(bytesConstRef _cipher) |
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{ |
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m_egressMac.Update(_cipher.data(), _cipher.size()); |
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updateMAC(m_egressMac); |
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{ |
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SHA3_256 prev(m_egressMac); |
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h128 digest; |
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prev.TruncatedFinal(digest.data(), h128::size); |
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clog(NetConnect) << "EGRESS FRAMEMAC " << _cipher.size() << digest; |
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} |
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} |
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void RLPXFrameIO::updateIngressMACWithHeader(bytesConstRef _headerCipher) |
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{ |
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updateMAC(m_ingressMac, *(h128*)_headerCipher.data()); |
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} |
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void RLPXFrameIO::updateIngressMACWithEndOfFrame(bytesConstRef _cipher) |
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{ |
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m_ingressMac.Update(_cipher.data(), _cipher.size()); |
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updateMAC(m_ingressMac); |
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{ |
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SHA3_256 prev(m_ingressMac); |
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h128 digest; |
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prev.TruncatedFinal(digest.data(), h128::size); |
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clog(NetConnect) << "INGRESS FRAMEMAC " << _cipher.size() << digest; |
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} |
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} |
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void RLPXFrameIO::updateMAC(SHA3_256& _mac, h128 const& _seed) |
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{ |
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SHA3_256 prevDigest(_mac); |
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h128 prevDigestOut; |
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prevDigest.TruncatedFinal(prevDigestOut.data(), h128::size); |
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h128 encDigest; |
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m_macEnc.ProcessData(encDigest.data(), prevDigestOut.data(), h128::size); |
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encDigest ^= (!!_seed ? _seed : prevDigestOut); |
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// update mac for final digest
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_mac.Update(encDigest.data(), h128::size); |
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} |
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@ -0,0 +1,97 @@ |
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/*
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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 RLPXFrameIO.h
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* @author Alex Leverington <nessence@gmail.com> |
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* @date 2015 |
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*/ |
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#pragma once |
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#include <memory> |
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#include <libdevcrypto/Common.h> |
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#include <libdevcrypto/ECDHE.h> |
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#include <libdevcrypto/CryptoPP.h> |
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#include "Common.h" |
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namespace ba = boost::asio; |
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namespace bi = boost::asio::ip; |
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namespace dev |
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{ |
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namespace p2p |
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{ |
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class RLPXHandshake; |
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class RLPXSocket: public std::enable_shared_from_this<RLPXSocket> |
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{ |
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public: |
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RLPXSocket(bi::tcp::socket* _socket): m_socket(std::move(*_socket)) {} |
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~RLPXSocket() { close(); } |
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bool isConnected() const { return m_socket.is_open(); } |
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void close() { try { boost::system::error_code ec; m_socket.shutdown(bi::tcp::socket::shutdown_both, ec); if (m_socket.is_open()) m_socket.close(); } catch (...){} } |
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bi::tcp::endpoint remoteEndpoint() { try { return m_socket.remote_endpoint(); } catch (...){ return bi::tcp::endpoint(); } } |
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bi::tcp::socket& ref() { return m_socket; } |
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protected: |
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bi::tcp::socket m_socket; |
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}; |
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class RLPXFrameIO |
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{ |
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friend class Session; |
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public: |
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RLPXFrameIO(RLPXHandshake const& _init); |
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void writeSingleFramePacket(bytesConstRef _packet, bytes& o_bytes); |
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/// Authenticates and decrypts header in-place.
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bool authAndDecryptHeader(h256& io_cipherWithMac); |
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/// Authenticates and decrypts frame in-place.
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bool authAndDecryptFrame(bytesRef io_cipherWithMac); |
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h128 egressDigest(); |
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h128 ingressDigest(); |
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void updateEgressMACWithHeader(bytesConstRef _headerCipher); |
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void updateEgressMACWithEndOfFrame(bytesConstRef _cipher); |
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void updateIngressMACWithHeader(bytesConstRef _headerCipher); |
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void updateIngressMACWithEndOfFrame(bytesConstRef _cipher); |
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protected: |
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bi::tcp::socket& socket() { return m_socket->ref(); } |
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private: |
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void updateMAC(CryptoPP::SHA3_256& _mac, h128 const& _seed = h128()); |
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CryptoPP::CTR_Mode<CryptoPP::AES>::Encryption m_frameEnc; |
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CryptoPP::CTR_Mode<CryptoPP::AES>::Encryption m_frameDec; |
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CryptoPP::ECB_Mode<CryptoPP::AES>::Encryption m_macEnc; |
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CryptoPP::SHA3_256 m_egressMac; |
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CryptoPP::SHA3_256 m_ingressMac; |
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std::shared_ptr<RLPXSocket> m_socket; |
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}; |
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} |
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} |
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