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/**
* Copyright (C) 2018 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects
* for all of the code used other than as permitted herein. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you do not
* wish to do so, delete this exception statement from your version. If you
* delete this exception statement from all source files in the program,
* then also delete it in the license file.
*/
#pragma once
#include "asio/detail/config.hpp"
#include "asio/buffer.hpp"
#include "asio/detail/static_mutex.hpp"
#include "mongo/util/net/ssl/detail/schannel.hpp"
#include "mongo/util/net/ssl/stream_base.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
namespace ssl {
namespace detail {
class engine {
public:
enum want {
// Returned by functions to indicate that the engine wants input. The input
// buffer should be updated to point to the data. The engine then needs to
// be called again to retry the operation.
want_input_and_retry = -2,
// Returned by functions to indicate that the engine wants to write output.
// The output buffer points to the data to be written. The engine then
// needs to be called again to retry the operation.
want_output_and_retry = -1,
// Returned by functions to indicate that the engine doesn't need input or
// output.
want_nothing = 0,
// Returned by functions to indicate that the engine wants to write output.
// The output buffer points to the data to be written. After that the
// operation is complete, and the engine does not need to be called again.
want_output = 1
};
// Construct a new engine for the specified context.
ASIO_DECL explicit engine(SCHANNEL_CRED* context, const std::string& remoteHostName);
// Destructor.
ASIO_DECL ~engine();
// Get the underlying implementation in the native type.
ASIO_DECL PCtxtHandle native_handle();
// Perform an SSL handshake using either SSL_connect (client-side) or
// SSL_accept (server-side).
ASIO_DECL want handshake(stream_base::handshake_type type, asio::error_code& ec);
// Perform a graceful shutdown of the SSL session.
ASIO_DECL want shutdown(asio::error_code& ec);
// Write bytes to the SSL session.
ASIO_DECL want write(const asio::const_buffer& data,
asio::error_code& ec,
std::size_t& bytes_transferred);
// Read bytes from the SSL session.
ASIO_DECL want read(const asio::mutable_buffer& data,
asio::error_code& ec,
std::size_t& bytes_transferred);
// Get output data to be written to the transport.
ASIO_DECL asio::mutable_buffer get_output(const asio::mutable_buffer& data);
// Put input data that was read from the transport.
ASIO_DECL asio::const_buffer put_input(const asio::const_buffer& data);
// Map an error::eof code returned by the underlying transport according to
// the type and state of the SSL session. Returns a const reference to the
// error code object, suitable for passing to a completion handler.
ASIO_DECL const asio::error_code& map_error_code(asio::error_code& ec) const;
private:
// Disallow copying and assignment.
engine(const engine&);
engine& operator=(const engine&);
private:
// SChannel context handle
CtxtHandle _hcxt;
// Credential handle
CredHandle _hcred;
// Credentials for TLS handshake
SCHANNEL_CRED* _pCred;
// TLS SNI server name
std::wstring _remoteHostName;
// Engine State machine
//
enum class EngineState {
// Initial State
NeedsHandshake,
// Normal SSL Conversation in progress
InProgress,
// In SSL shutdown
InShutdown,
};
// Engine state
EngineState _state{EngineState::NeedsHandshake};
// Data received from remote side, shared across state machines
ReusableBuffer _inBuffer;
// Data to send to remote side, shared across state machines
ReusableBuffer _outBuffer;
// Extra buffer - for when more then one packet is read from the remote side
ReusableBuffer _extraBuffer;
// Handshake state machine
SSLHandshakeManager _handshakeManager;
// Read state machine
SSLReadManager _readManager;
// Write state machine
SSLWriteManager _writeManager;
};
#include "asio/detail/pop_options.hpp"
} // namespace detail
} // namespace ssl
} // namespace asio
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