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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <cstddef>
#include <string>
#include "net/third_party/quiche/src/quic/core/crypto/crypto_framer.h"
#include "net/third_party/quiche/src/quic/core/crypto/crypto_utils.h"
#include "net/third_party/quiche/src/quic/core/quic_config.h"
#include "net/third_party/quiche/src/quic/core/quic_packets.h"
#include "net/third_party/quiche/src/quic/core/quic_stream.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_export.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_string_piece.h"
namespace quic {
class QuicSession;
// Crypto handshake messages in QUIC take place over a reserved stream with the
// id 1. Each endpoint (client and server) will allocate an instance of a
// subclass of QuicCryptoStream to send and receive handshake messages. (In the
// normal 1-RTT handshake, the client will send a client hello, CHLO, message.
// The server will receive this message and respond with a server hello message,
// SHLO. At this point both sides will have established a crypto context they
// can use to send encrypted messages.
// For more details:
class QUIC_EXPORT_PRIVATE QuicCryptoStream : public QuicStream {
explicit QuicCryptoStream(QuicSession* session);
QuicCryptoStream(const QuicCryptoStream&) = delete;
QuicCryptoStream& operator=(const QuicCryptoStream&) = delete;
~QuicCryptoStream() override;
// Returns the per-packet framing overhead associated with sending a
// handshake message for |version|.
static QuicByteCount CryptoMessageFramingOverhead(
QuicTransportVersion version,
QuicConnectionId connection_id);
// QuicStream implementation
void OnStreamFrame(const QuicStreamFrame& frame) override;
void OnDataAvailable() override;
// Called when a CRYPTO frame is received.
void OnCryptoFrame(const QuicCryptoFrame& frame);
// Called when a CRYPTO frame is ACKed.
bool OnCryptoFrameAcked(const QuicCryptoFrame& frame,
QuicTime::Delta ack_delay_time);
// Performs key extraction to derive a new secret of |result_len| bytes
// dependent on |label|, |context|, and the stream's negotiated subkey secret.
// Returns false if the handshake has not been confirmed or the parameters are
// invalid (e.g. |label| contains null bytes); returns true on success.
bool ExportKeyingMaterial(QuicStringPiece label,
QuicStringPiece context,
size_t result_len,
std::string* result) const;
// Writes |data| to the QuicStream at level |level|.
virtual void WriteCryptoData(EncryptionLevel level, QuicStringPiece data);
// Returns true once an encrypter has been set for the connection.
virtual bool encryption_established() const = 0;
// Returns true once the crypto handshake has completed.
virtual bool handshake_confirmed() const = 0;
// Returns the parameters negotiated in the crypto handshake.
virtual const QuicCryptoNegotiatedParameters& crypto_negotiated_params()
const = 0;
// Provides the message parser to use when data is received on this stream.
virtual CryptoMessageParser* crypto_message_parser() = 0;
// Called when the underlying QuicConnection has agreed upon a QUIC version to
// use.
virtual void OnSuccessfulVersionNegotiation(const ParsedQuicVersion& version);
// Called to cancel retransmission of unencrypted crypto stream data.
void NeuterUnencryptedStreamData();
// Override to record the encryption level of consumed data.
void OnStreamDataConsumed(size_t bytes_consumed) override;
// Returns whether there are any bytes pending retransmission in CRYPTO
// frames.
virtual bool HasPendingCryptoRetransmission() const;
// Writes any pending CRYPTO frame retransmissions.
void WritePendingCryptoRetransmission();
// Override to retransmit lost crypto data with the appropriate encryption
// level.
void WritePendingRetransmission() override;
// Override to send unacked crypto data with the appropriate encryption level.
bool RetransmitStreamData(QuicStreamOffset offset,
QuicByteCount data_length,
bool fin) override;
// Returns the number of bytes of handshake data that have been received from
// the peer in either CRYPTO or STREAM frames.
uint64_t crypto_bytes_read() const;
// Returns the number of bytes of handshake data that have been received from
// the peer in CRYPTO frames at a particular encryption level.
QuicByteCount BytesReadOnLevel(EncryptionLevel level) const;
// Writes |data_length| of data of a crypto frame to |writer|. The data
// written is from the send buffer for encryption level |level| and starts at
// |offset|.
bool WriteCryptoFrame(EncryptionLevel level,
QuicStreamOffset offset,
QuicByteCount data_length,
QuicDataWriter* writer);
// Called when data from a CRYPTO frame is considered lost. The lost data is
// identified by the encryption level, offset, and length in |crypto_frame|.
void OnCryptoFrameLost(QuicCryptoFrame* crypto_frame);
// Called to retransmit any outstanding data in the range indicated by the
// encryption level, offset, and length in |crypto_frame|.
void RetransmitData(QuicCryptoFrame* crypto_frame);
// Returns true if any portion of the data at encryption level |level|
// starting at |offset| for |length| bytes is outstanding.
bool IsFrameOutstanding(EncryptionLevel level,
size_t offset,
size_t length) const;
// Returns true if the crypto handshake is still waiting for acks of sent
// data, and false if all data has been acked.
bool IsWaitingForAcks() const;
// Data sent and received in CRYPTO frames is sent at multiple encryption
// levels. Some of the state for the single logical crypto stream is split
// across encryption levels, and a CryptoSubstream is used to manage that
// state for a particular encryption level.
struct CryptoSubstream {
CryptoSubstream(QuicCryptoStream* crypto_stream, EncryptionLevel);
QuicStreamSequencer sequencer;
QuicStreamSendBuffer send_buffer;
// Helper method for OnDataAvailable. Calls CryptoMessageParser::ProcessInput
// with the data available in |sequencer| and |level|, and marks the data
// passed to ProcessInput as consumed.
void OnDataAvailableInSequencer(QuicStreamSequencer* sequencer,
EncryptionLevel level);
// Consumed data according to encryption levels.
// TODO(fayang): This is not needed once switching from QUIC crypto to
// TLS 1.3, which never encrypts crypto data.
QuicIntervalSet<QuicStreamOffset> bytes_consumed_[NUM_ENCRYPTION_LEVELS];
// Keeps state for data sent/received in CRYPTO frames at each encryption
// level.
CryptoSubstream substreams_[NUM_ENCRYPTION_LEVELS];
} // namespace quic