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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "net/quic/quic_crypto_stream.h"
      6 
      7 #include <string>
      8 
      9 #include "base/strings/string_piece.h"
     10 #include "net/quic/crypto/crypto_handshake.h"
     11 #include "net/quic/crypto/crypto_utils.h"
     12 #include "net/quic/quic_connection.h"
     13 #include "net/quic/quic_session.h"
     14 #include "net/quic/quic_utils.h"
     15 
     16 using std::string;
     17 using base::StringPiece;
     18 
     19 namespace net {
     20 
     21 #define ENDPOINT (session()->is_server() ? "Server: " : " Client: ")
     22 
     23 QuicCryptoStream::QuicCryptoStream(QuicSession* session)
     24     : ReliableQuicStream(kCryptoStreamId, session),
     25       encryption_established_(false),
     26       handshake_confirmed_(false) {
     27   crypto_framer_.set_visitor(this);
     28   if (version() < QUIC_VERSION_21) {
     29     // Prior to QUIC_VERSION_21 the crypto stream is not subject to any flow
     30     // control.
     31     DisableFlowControl();
     32   }
     33   // The crypto stream is exempt from connection level flow control.
     34   DisableConnectionFlowControlForThisStream();
     35 }
     36 
     37 void QuicCryptoStream::OnError(CryptoFramer* framer) {
     38   DLOG(WARNING) << "Error processing crypto data: "
     39                 << QuicUtils::ErrorToString(framer->error());
     40 }
     41 
     42 void QuicCryptoStream::OnHandshakeMessage(
     43     const CryptoHandshakeMessage& message) {
     44   DVLOG(1) << ENDPOINT << "Received " << message.DebugString();
     45   session()->OnCryptoHandshakeMessageReceived(message);
     46 }
     47 
     48 uint32 QuicCryptoStream::ProcessRawData(const char* data,
     49                                         uint32 data_len) {
     50   if (!crypto_framer_.ProcessInput(StringPiece(data, data_len))) {
     51     CloseConnection(crypto_framer_.error());
     52     return 0;
     53   }
     54   return data_len;
     55 }
     56 
     57 QuicPriority QuicCryptoStream::EffectivePriority() const {
     58   return QuicUtils::HighestPriority();
     59 }
     60 
     61 void QuicCryptoStream::SendHandshakeMessage(
     62     const CryptoHandshakeMessage& message) {
     63   SendHandshakeMessage(message, NULL);
     64 }
     65 
     66 void QuicCryptoStream::SendHandshakeMessage(
     67     const CryptoHandshakeMessage& message,
     68     QuicAckNotifier::DelegateInterface* delegate) {
     69   DVLOG(1) << ENDPOINT << "Sending " << message.DebugString();
     70   session()->OnCryptoHandshakeMessageSent(message);
     71   const QuicData& data = message.GetSerialized();
     72   // TODO(wtc): check the return value.
     73   WriteOrBufferData(string(data.data(), data.length()), false, delegate);
     74 }
     75 
     76 bool QuicCryptoStream::ExportKeyingMaterial(
     77     StringPiece label,
     78     StringPiece context,
     79     size_t result_len,
     80     string* result) const {
     81   if (!handshake_confirmed()) {
     82     DLOG(ERROR) << "ExportKeyingMaterial was called before forward-secure"
     83                 << "encryption was established.";
     84     return false;
     85   }
     86   return CryptoUtils::ExportKeyingMaterial(
     87       crypto_negotiated_params_.subkey_secret,
     88       label,
     89       context,
     90       result_len,
     91       result);
     92 }
     93 
     94 const QuicCryptoNegotiatedParameters&
     95 QuicCryptoStream::crypto_negotiated_params() const {
     96   return crypto_negotiated_params_;
     97 }
     98 
     99 }  // namespace net
    100