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133 lines
4.2 KiB
133 lines
4.2 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 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 <libdevcore/Guards.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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/**
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* @brief Encoder/decoder transport for RLPx connections established by RLPXHandshake.
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* Managed (via shared_ptr) socket for use by RLPXHandshake and RLPXFrameIO.
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*
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* Thread Safety
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* Distinct Objects: Safe.
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* Shared objects: Unsafe.
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* * an instance method must not be called concurrently
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* * a writeSingleFramePacket can be called concurrent to authAndDecryptHeader OR authAndDecryptFrame
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*/
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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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/**
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* @brief Encoder/decoder transport for RLPx connections established by RLPXHandshake.
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*
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* Thread Safety
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* Distinct Objects: Safe.
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* Shared objects: Unsafe.
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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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/// Constructor.
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/// Requires instance of RLPXHandshake which has completed first two phases of handshake.
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RLPXFrameIO(RLPXHandshake const& _init);
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~RLPXFrameIO() {}
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/// Encrypt _packet as RLPx frame.
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void writeSingleFramePacket(bytesConstRef _packet, bytes& o_bytes);
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/// Authenticate and decrypt header in-place.
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bool authAndDecryptHeader(bytesRef io_cipherWithMac);
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/// Authenticate and decrypt frame in-place.
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bool authAndDecryptFrame(bytesRef io_cipherWithMac);
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/// Return first 16 bytes of current digest from egress mac.
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h128 egressDigest();
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/// Return first 16 bytes of current digest from ingress mac.
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h128 ingressDigest();
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protected:
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/// Update state of egress MAC with frame header.
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void updateEgressMACWithHeader(bytesConstRef _headerCipher);
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/// Update state of egress MAC with frame.
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void updateEgressMACWithFrame(bytesConstRef _cipher);
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/// Update state of ingress MAC with frame header.
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void updateIngressMACWithHeader(bytesConstRef _headerCipher);
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/// Update state of ingress MAC with frame.
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void updateIngressMACWithFrame(bytesConstRef _cipher);
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bi::tcp::socket& socket() { return m_socket->ref(); }
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private:
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/// Update state of _mac.
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void updateMAC(CryptoPP::SHA3_256& _mac, bytesConstRef _seed = bytesConstRef());
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CryptoPP::SecByteBlock m_frameEncKey; ///< Key for m_frameEnc
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CryptoPP::CTR_Mode<CryptoPP::AES>::Encryption m_frameEnc; ///< Encoder for egress plaintext.
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CryptoPP::SecByteBlock m_frameDecKey; ///< Key for m_frameDec
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CryptoPP::CTR_Mode<CryptoPP::AES>::Encryption m_frameDec; ///< Decoder for egress plaintext.
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CryptoPP::SecByteBlock m_macEncKey; /// Key for m_macEnd
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CryptoPP::ECB_Mode<CryptoPP::AES>::Encryption m_macEnc; /// One-way coder used by updateMAC for ingress and egress MAC updates.
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Mutex x_macEnc; /// Mutex
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CryptoPP::SHA3_256 m_egressMac; ///< State of MAC for egress ciphertext.
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CryptoPP::SHA3_256 m_ingressMac; ///< State of MAC for ingress ciphertext.
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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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