Define Stable API for WebRTC/Quartc

net/quic/quartc/quartc_session.cc

+// 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 "net/quic/quartc/quartc_session.h"
+
+#include "base/rand_util.h"
+
+namespace {
+// Default priority for incoming QUIC streams.
+// TODO(zhihuang): Determine if this value is correct.
+static const net::SpdyPriority kDefaultPriority = 3;
+
+// Arbitrary server port number for net::QuicCryptoClientConfig.
+const int kQuicServerPort = 0;
+
+// Length of HKDF input keying material, equal to its number of bytes.
+// https://tools.ietf.org/html/rfc5869#section-2.2.
+// TODO(zhihuang): Verify that input keying material length is correct.
+const size_t kInputKeyingMaterialLength = 32;
+
+// Used by QuicCryptoServerConfig to provide dummy proof credentials.
+// TODO(zhihuang): Remove when secure P2P QUIC handshake is possible.
+class DummyProofSource : public net::ProofSource {
+ public:
+  DummyProofSource() {}
+  ~DummyProofSource() override {}
+
+  // ProofSource override.
+  bool GetProof(const net::IPAddress& server_ip,
+                const std::string& hostname,
+                const std::string& server_config,
+                net::QuicVersion quic_version,
+                base::StringPiece chlo_hash,
+                scoped_refptr<net::ProofSource::Chain>* out_chain,
+                std::string* out_signature,
+                std::string* out_leaf_cert_sct) override {
+    std::vector<std::string> certs;
+    certs.push_back("Dummy cert");
+    *out_chain = new ProofSource::Chain(certs);
+    *out_signature = "Dummy signature";
+    *out_leaf_cert_sct = "Dummy timestamp";
+    return true;
+  }
+
+  void GetProof(const net::IPAddress& server_ip,
+                const std::string& hostname,
+                const std::string& server_config,
+                net::QuicVersion quic_version,
+                base::StringPiece chlo_hash,
+                std::unique_ptr<Callback> callback) override {}
+};
+
+// Used by QuicCryptoClientConfig to ignore the peer's credentials
+// and establish an insecure QUIC connection.
+// TODO(zhihuang): Remove when secure P2P QUIC handshake is possible.
+class InsecureProofVerifier : public net::ProofVerifier {
+ public:
+  InsecureProofVerifier() {}
+  ~InsecureProofVerifier() override {}
+
+  // ProofVerifier override.
+  net::QuicAsyncStatus VerifyProof(
+      const std::string& hostname,
+      const uint16_t port,
+      const std::string& server_config,
+      net::QuicVersion quic_version,
+      base::StringPiece chlo_hash,
+      const std::vector<std::string>& certs,
+      const std::string& cert_sct,
+      const std::string& signature,
+      const net::ProofVerifyContext* context,
+      std::string* error_details,
+      std::unique_ptr<net::ProofVerifyDetails>* verify_details,
+      std::unique_ptr<net::ProofVerifierCallback> callback) override {
+    return net::QUIC_SUCCESS;
+  }
+
+  net::QuicAsyncStatus VerifyCertChain(
+      const std::string& hostname,
+      const std::vector<std::string>& certs,
+      const net::ProofVerifyContext* context,
+      std::string* error_details,
+      std::unique_ptr<net::ProofVerifyDetails>* details,
+      std::unique_ptr<net::ProofVerifierCallback> callback) override {
+    return net::QUIC_SUCCESS;
+  }
+};
+}
+
+namespace net {
+
+QuicConnectionId QuartcCryptoServerStreamHelper::GenerateConnectionIdForReject(
+    QuicConnectionId connection_id) const {
+  return 0;
+}
+
+bool QuartcCryptoServerStreamHelper::CanAcceptClientHello(
+    const CryptoHandshakeMessage& message,
+    const IPEndPoint& self_address,
+    std::string* error_details) const {
+  return true;
+}
+
+void QuartcSessionTransportObserver::OnCanWrite() {
+  OnQuartcCanWrite();
+}
+
+QuartcSession::QuartcSession(std::unique_ptr<QuicConnection> connection,
+                             const QuicConfig& config,
+                             const std::string& remote_finger_print_value,
+                             Perspective perspective)
+    : QuicSession(connection.release(), config),
+      remote_finger_print_value_(remote_finger_print_value),
+      perspective_(perspective) {
+  // Initialization with default crypto configuration.
+  if (perspective_ == Perspective::IS_CLIENT) {
+    std::unique_ptr<ProofVerifier> proof_verifier(new InsecureProofVerifier);
+    quic_crypto_client_config_.reset(
+        new QuicCryptoClientConfig(std::move(proof_verifier)));
+  } else {
+    std::unique_ptr<ProofSource> proof_source(new DummyProofSource);
+    std::string source_address_token_secret =
+        base::RandBytesAsString(kInputKeyingMaterialLength);
+    quic_crypto_server_config_.reset(new QuicCryptoServerConfig(
+        source_address_token_secret, helper_.GetRandomGenerator(),
+        std::move(proof_source)));
+    // Provide server with serialized config string to prove ownership.
+    QuicCryptoServerConfig::ConfigOptions options;
+    quic_crypto_server_config_->AddDefaultConfig(helper_.GetRandomGenerator(),
+                                                 helper_.GetClock(), options);
+  }
+}
+
+QuartcSession::~QuartcSession() {}
+
+QuicCryptoStream* QuartcSession::GetCryptoStream() {
+  return crypto_stream_.get();
+}
+
+QuartcReliableStream* QuartcSession::CreateOutgoingDynamicStream(
+    SpdyPriority priority) {
+  return CreateDataStream(GetNextOutgoingStreamId(), priority);
+}
+
+void QuartcSession::OnCryptoHandshakeEvent(CryptoHandshakeEvent event) {
+  QuicSession::OnCryptoHandshakeEvent(event);
+  if (event == HANDSHAKE_CONFIRMED) {
+    DCHECK(IsEncryptionEstablished());
+    DCHECK(IsCryptoHandshakeConfirmed());
+
+    DCHECK(session_observer_);
+    session_observer_->OnCryptoHandshakeComplete();
+  }
+}
+
+void QuartcSession::CloseStream(QuicStreamId stream_id) {
+  if (IsClosedStream(stream_id)) {
+    // When CloseStream has been called recursively (via
+    // ReliableQuicStream::OnClose), the stream is already closed so return.
+    return;
+  }
+  write_blocked_streams()->UnregisterStream(stream_id);
+  QuicSession::CloseStream(stream_id);
+}
+
+void QuartcSession::OnConnectionClosed(QuicErrorCode error,
+                                       const std::string& error_details,
+                                       ConnectionCloseSource source) {
+  QuicSession::OnConnectionClosed(error, error_details, source);
+  DCHECK(session_observer_);
+  session_observer_->OnConnectionClosed(
+      error, source == ConnectionCloseSource::FROM_PEER);
+}
+
+void QuartcSession::StartCryptoHandshake() {
+  if (perspective_ == Perspective::IS_CLIENT) {
+    QuicServerId server_id(remote_finger_print_value_, kQuicServerPort);
+    QuicCryptoClientStream* crypto_stream =
+        new QuicCryptoClientStream(server_id, this, new ProofVerifyContext(),
+                                   quic_crypto_client_config_.get(), this);
+    crypto_stream_.reset(crypto_stream);
+    QuicSession::Initialize();
+    crypto_stream->CryptoConnect();
+  } else {
+    quic_compressed_certs_cache_.reset(new QuicCompressedCertsCache(
+        QuicCompressedCertsCache::kQuicCompressedCertsCacheSize));
+    bool use_stateless_rejects_if_peer_supported = false;
+    QuicCryptoServerStream* crypto_stream = new QuicCryptoServerStream(
+        quic_crypto_server_config_.get(), quic_compressed_certs_cache_.get(),
+        use_stateless_rejects_if_peer_supported, this, &stream_helper_);
+    crypto_stream_.reset(crypto_stream);
+    QuicSession::Initialize();
+  }
+}
+
+bool QuartcSession::ExportKeyingMaterial(const std::string& label,
+                                         const uint8_t* context,
+                                         size_t context_len,
+                                         uint8_t* result,
+                                         size_t result_len) {
+  std::string quic_context(reinterpret_cast<const char*>(context), context_len);
+  std::string quic_result;
+  bool success = crypto_stream_->ExportKeyingMaterial(label, quic_context,
+                                                      result_len, &quic_result);
+  quic_result.copy(reinterpret_cast<char*>(result), result_len);

[skvlad-chromium, 2016/09/22 01:54:26]

I'd probably DCHECK(quic_result.length() == result_len) here just to be sure.

[zhihuang1, 2016/09/22 18:53:52]

Done.

+  return success;
+}
+
+QuartcReliableStreamInterface* QuartcSession::CreateOutgoingStream(
+    const OutgoingStreamParameters& param) {
+  // The |param| is for forward-compatibility. Not used for now.
+  return CreateOutgoingDynamicStream(kDefaultPriority);
+}
+
+void QuartcSession::OnQuartcCanWrite() {
+  connection()->OnCanWrite();
+}
+
+void QuartcSession::SetTransport(
+    QuartcSessionInterface::Transport* session_transport) {
+  session_transport_ = session_transport;
+  DCHECK(session_transport_);
+  session_transport_->SetObserver(this);
+}
+
+void QuartcSession::SetObserver(
+    QuartcSessionInterface::Observer* session_observer) {
+  session_observer_ = session_observer;

[skvlad-chromium, 2016/09/22 01:54:25]

DCHECK(session_observer_)?

[zhihuang1, 2016/09/22 18:53:52]

Done.

+}
+
+// Decrypts an incoming QUIC packet to a data stream.
+bool QuartcSession::OnReceived(const char* data, size_t data_len) {
+  QuicReceivedPacket packet(data, data_len, clock_.Now());
+  ProcessUdpPacket(connection()->self_address(), connection()->peer_address(),
+                   packet);
+  return true;
+}
+
+void QuartcSession::OnProofValid(
+    const QuicCryptoClientConfig::CachedState& cached) {
+  // TODO(zhihuang): Handle the proof verification.
+}
+
+void QuartcSession::OnProofVerifyDetailsAvailable(
+    const ProofVerifyDetails& verify_details) {
+  // TODO(zhihuang): Handle the proof verification.
+}
+
+void QuartcSession::SetClientCryptoConfig(
+    QuicCryptoClientConfig* client_config) {
+  quic_crypto_client_config_.reset(client_config);
+}
+
+void QuartcSession::SetServerCryptoConfig(
+    QuicCryptoServerConfig* server_config) {
+  quic_crypto_server_config_.reset(server_config);
+}
+
+ReliableQuicStream* QuartcSession::CreateIncomingDynamicStream(
+    QuicStreamId id) {
+  QuartcReliableStream* stream = CreateDataStream(id, kDefaultPriority);
+  if (stream) {
+    DCHECK(session_observer_);
+    session_observer_->OnIncomingStream(stream);
+  }
+  return stream;
+}
+
+QuartcReliableStream* QuartcSession::CreateDataStream(QuicStreamId id,
+                                                      SpdyPriority priority) {
+  if (crypto_stream_ == nullptr || !crypto_stream_->encryption_established()) {
+    // Encryption not active so no stream created
+    return nullptr;
+  }
+  QuartcReliableStream* stream = new QuartcReliableStream(id, this);
+  if (stream) {
+    // Make QuicSession take ownership of the stream.
+    ActivateStream(stream);
+    // Register the stream to the QuicWriteBlockedList. |priority| is clamped
+    // between 0 and 7, with 0 being the highest priority and 7 the lowest
+    // priority.
+    write_blocked_streams()->RegisterStream(stream->id(), priority);
+  }
+  return stream;
+}
+
+}  // namespace net