Port WebSockets to Mojo IPC

content/browser/websockets/websocket_impl.cc

+// Copyright 2013 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 "content/browser/websockets/websocket_impl.h"
+
+#include <inttypes.h>
+
+#include <utility>
+
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "base/location.h"
+#include "base/logging.h"
+#include "base/macros.h"
+#include "base/memory/ptr_util.h"
+#include "base/single_thread_task_runner.h"
+#include "base/strings/string_util.h"
+#include "base/strings/stringprintf.h"
+#include "base/threading/thread_task_runner_handle.h"
+#include "content/browser/bad_message.h"
+#include "content/browser/child_process_security_policy_impl.h"
+#include "content/browser/ssl/ssl_error_handler.h"
+#include "content/browser/ssl/ssl_manager.h"
+#include "content/public/browser/storage_partition.h"
+#include "ipc/ipc_message.h"
+#include "net/base/net_errors.h"
+#include "net/http/http_request_headers.h"
+#include "net/http/http_response_headers.h"
+#include "net/http/http_util.h"
+#include "net/ssl/ssl_info.h"
+#include "net/url_request/url_request_context_getter.h"
+#include "net/websockets/websocket_channel.h"
+#include "net/websockets/websocket_errors.h"
+#include "net/websockets/websocket_event_interface.h"
+#include "net/websockets/websocket_frame.h"  // for WebSocketFrameHeader::OpCode
+#include "net/websockets/websocket_handshake_request_info.h"
+#include "net/websockets/websocket_handshake_response_info.h"
+#include "url/origin.h"
+
+namespace content {
+namespace {
+
+typedef net::WebSocketEventInterface::ChannelState ChannelState;
+
+// Convert a mojom::WebSocketMessageType to a
+// net::WebSocketFrameHeader::OpCode
+net::WebSocketFrameHeader::OpCode MessageTypeToOpCode(
+    mojom::WebSocketMessageType type) {
+  DCHECK(type == mojom::WebSocketMessageType::CONTINUATION ||
+         type == mojom::WebSocketMessageType::TEXT ||
+         type == mojom::WebSocketMessageType::BINARY);
+  typedef net::WebSocketFrameHeader::OpCode OpCode;
+  // These compile asserts verify that the same underlying values are used for
+  // both types, so we can simply cast between them.
+  static_assert(
+      static_cast<OpCode>(mojom::WebSocketMessageType::CONTINUATION) ==
+          net::WebSocketFrameHeader::kOpCodeContinuation,
+      "enum values must match for opcode continuation");
+  static_assert(
+      static_cast<OpCode>(mojom::WebSocketMessageType::TEXT) ==
+          net::WebSocketFrameHeader::kOpCodeText,
+      "enum values must match for opcode text");
+  static_assert(
+      static_cast<OpCode>(mojom::WebSocketMessageType::BINARY) ==
+          net::WebSocketFrameHeader::kOpCodeBinary,
+      "enum values must match for opcode binary");
+  return static_cast<OpCode>(type);
+}
+
+mojom::WebSocketMessageType OpCodeToMessageType(
+    net::WebSocketFrameHeader::OpCode opCode) {
+  DCHECK(opCode == net::WebSocketFrameHeader::kOpCodeContinuation ||
+         opCode == net::WebSocketFrameHeader::kOpCodeText ||
+         opCode == net::WebSocketFrameHeader::kOpCodeBinary);
+  // This cast is guaranteed valid by the static_assert() statements above.
+  return static_cast<mojom::WebSocketMessageType>(opCode);
+}
+
+}  // namespace
+
+// Implementation of net::WebSocketEventInterface. Receives events from our
+// WebSocketChannel object.
+class WebSocketImpl::WebSocketEventHandler final
+    : public net::WebSocketEventInterface {
+ public:
+  explicit WebSocketEventHandler(WebSocketImpl* impl);
+  ~WebSocketEventHandler() override;
+
+  // net::WebSocketEventInterface implementation
+
+  ChannelState OnAddChannelResponse(const std::string& selected_subprotocol,
+                                    const std::string& extensions) override;
+  ChannelState OnDataFrame(bool fin,
+                           WebSocketMessageType type,
+                           const std::vector<char>& data) override;
+  ChannelState OnClosingHandshake() override;
+  ChannelState OnFlowControl(int64_t quota) override;
+  ChannelState OnDropChannel(bool was_clean,
+                             uint16_t code,
+                             const std::string& reason) override;
+  ChannelState OnFailChannel(const std::string& message) override;
+  ChannelState OnStartOpeningHandshake(
+      std::unique_ptr<net::WebSocketHandshakeRequestInfo> request) override;
+  ChannelState OnFinishOpeningHandshake(
+      std::unique_ptr<net::WebSocketHandshakeResponseInfo> response) override;
+  ChannelState OnSSLCertificateError(
+      std::unique_ptr<net::WebSocketEventInterface::SSLErrorCallbacks>
+          callbacks,
+      const GURL& url,
+      const net::SSLInfo& ssl_info,
+      bool fatal) override;
+
+ private:
+  class SSLErrorHandlerDelegate final : public SSLErrorHandler::Delegate {
+   public:
+    SSLErrorHandlerDelegate(
+        std::unique_ptr<net::WebSocketEventInterface::SSLErrorCallbacks>
+            callbacks);
+    ~SSLErrorHandlerDelegate() override;
+
+    base::WeakPtr<SSLErrorHandler::Delegate> GetWeakPtr();
+
+    // SSLErrorHandler::Delegate methods
+    void CancelSSLRequest(int error, const net::SSLInfo* ssl_info) override;
+    void ContinueSSLRequest() override;
+
+   private:
+    std::unique_ptr<net::WebSocketEventInterface::SSLErrorCallbacks> callbacks_;
+    base::WeakPtrFactory<SSLErrorHandlerDelegate> weak_ptr_factory_;
+
+    DISALLOW_COPY_AND_ASSIGN(SSLErrorHandlerDelegate);
+  };
+
+  WebSocketImpl* const impl_;
+  std::unique_ptr<SSLErrorHandlerDelegate> ssl_error_handler_delegate_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebSocketEventHandler);
+};
+
+WebSocketImpl::WebSocketEventHandler::WebSocketEventHandler(WebSocketImpl* impl)
+    : impl_(impl) {
+  DVLOG(1) << "WebSocketEventHandler created @"
+           << reinterpret_cast<void*>(this);
+}
+
+WebSocketImpl::WebSocketEventHandler::~WebSocketEventHandler() {
+  DVLOG(1) << "WebSocketEventHandler destroyed @"
+           << reinterpret_cast<void*>(this);
+}
+
+ChannelState WebSocketImpl::WebSocketEventHandler::OnAddChannelResponse(
+    const std::string& selected_protocol,
+    const std::string& extensions) {
+  DVLOG(3) << "WebSocketEventHandler::OnAddChannelResponse @"
+           << reinterpret_cast<void*>(this)
+           << " selected_protocol=\"" << selected_protocol << "\""
+           << " extensions=\"" << extensions << "\"";
+
+  impl_->delegate_->OnReceivedResponseFromServer(impl_);
+
+  impl_->client_->OnAddChannelResponse(selected_protocol, extensions);
+
+  return net::WebSocketEventInterface::CHANNEL_ALIVE;
+}
+
+ChannelState WebSocketImpl::WebSocketEventHandler::OnDataFrame(
+    bool fin,
+    net::WebSocketFrameHeader::OpCode type,
+    const std::vector<char>& data) {
+  DVLOG(3) << "WebSocketEventHandler::OnDataFrame @"
+           << reinterpret_cast<void*>(this)
+           << " fin=" << fin
+           << " type=" << type << " data is " << data.size() << " bytes";
+
+  // TODO(darin): Avoid this copy.
+  mojo::Array<uint8_t> data_to_pass(data.size());
+  std::copy(data.begin(), data.end(), data_to_pass.begin());
+
+  impl_->client_->OnDataFrame(fin, OpCodeToMessageType(type),
+                              std::move(data_to_pass));
+
+  return net::WebSocketEventInterface::CHANNEL_ALIVE;
+}
+
+ChannelState WebSocketImpl::WebSocketEventHandler::OnClosingHandshake() {
+  DVLOG(3) << "WebSocketEventHandler::OnClosingHandshake @"
+           << reinterpret_cast<void*>(this);
+
+  impl_->client_->OnClosingHandshake();
+
+  return net::WebSocketEventInterface::CHANNEL_ALIVE;
+}
+
+ChannelState WebSocketImpl::WebSocketEventHandler::OnFlowControl(
+    int64_t quota) {
+  DVLOG(3) << "WebSocketEventHandler::OnFlowControl @"
+           << reinterpret_cast<void*>(this)
+           << " quota=" << quota;
+
+  impl_->client_->OnFlowControl(quota);
+
+  return net::WebSocketEventInterface::CHANNEL_ALIVE;
+}
+
+ChannelState WebSocketImpl::WebSocketEventHandler::OnDropChannel(
+    bool was_clean,
+    uint16_t code,
+    const std::string& reason) {
+  DVLOG(3) << "WebSocketEventHandler::OnDropChannel @"
+           << reinterpret_cast<void*>(this)
+           << " was_clean=" << was_clean << " code=" << code
+           << " reason=\"" << reason << "\"";
+
+  impl_->client_->OnDropChannel(was_clean, code, reason);
+
+  // net::WebSocketChannel requires that we delete it at this point.
+  impl_->channel_.reset();
+
+  return net::WebSocketEventInterface::CHANNEL_DELETED;
+}
+
+ChannelState WebSocketImpl::WebSocketEventHandler::OnFailChannel(
+    const std::string& message) {
+  DVLOG(3) << "WebSocketEventHandler::OnFailChannel @"
+           << reinterpret_cast<void*>(this) << " message=\"" << message << "\"";
+
+  impl_->client_->OnFailChannel(message);
+
+  // net::WebSocketChannel requires that we delete it at this point.
+  impl_->channel_.reset();
+
+  return net::WebSocketEventInterface::CHANNEL_DELETED;
+}
+
+ChannelState WebSocketImpl::WebSocketEventHandler::OnStartOpeningHandshake(
+    std::unique_ptr<net::WebSocketHandshakeRequestInfo> request) {
+  bool should_send =
+      ChildProcessSecurityPolicyImpl::GetInstance()->CanReadRawCookies(
+          impl_->delegate_->GetClientProcessId());
+
+  DVLOG(3) << "WebSocketEventHandler::OnStartOpeningHandshake @"
+           << reinterpret_cast<void*>(this) << " should_send=" << should_send;
+
+  if (!should_send)
+    return WebSocketEventInterface::CHANNEL_ALIVE;
+
+  mojom::WebSocketHandshakeRequestPtr request_to_pass(
+      mojom::WebSocketHandshakeRequest::New());
+  request_to_pass->url.Swap(&request->url);
+  net::HttpRequestHeaders::Iterator it(request->headers);
+  while (it.GetNext()) {
+    mojom::HttpHeaderPtr header(mojom::HttpHeader::New());
+    header->name = it.name();
+    header->value = it.value();
+    request_to_pass->headers.push_back(std::move(header));
+  }
+  request_to_pass->headers_text =
+      base::StringPrintf("GET %s HTTP/1.1\r\n",
+                         request_to_pass->url.spec().c_str()) +
+      request->headers.ToString();
+
+  impl_->client_->OnStartOpeningHandshake(std::move(request_to_pass));
+
+  return WebSocketEventInterface::CHANNEL_ALIVE;
+}
+
+ChannelState WebSocketImpl::WebSocketEventHandler::OnFinishOpeningHandshake(
+    std::unique_ptr<net::WebSocketHandshakeResponseInfo> response) {
+  bool should_send =
+      ChildProcessSecurityPolicyImpl::GetInstance()->CanReadRawCookies(
+          impl_->delegate_->GetClientProcessId());
+
+  DVLOG(3) << "WebSocketEventHandler::OnFinishOpeningHandshake "
+           << reinterpret_cast<void*>(this) << " should_send=" << should_send;
+
+  if (!should_send)
+    return WebSocketEventInterface::CHANNEL_ALIVE;
+
+  mojom::WebSocketHandshakeResponsePtr response_to_pass(
+      mojom::WebSocketHandshakeResponse::New());
+  response_to_pass->url.Swap(&response->url);
+  response_to_pass->status_code = response->status_code;
+  response_to_pass->status_text = response->status_text;
+  size_t iter = 0;
+  std::string name, value;
+  while (response->headers->EnumerateHeaderLines(&iter, &name, &value)) {
+    mojom::HttpHeaderPtr header(mojom::HttpHeader::New());
+    header->name = name;
+    header->value = value;
+    response_to_pass->headers.push_back(std::move(header));
+  }
+  response_to_pass->headers_text =
+      net::HttpUtil::ConvertHeadersBackToHTTPResponse(
+          response->headers->raw_headers());
+
+  impl_->client_->OnFinishOpeningHandshake(std::move(response_to_pass));
+
+  return WebSocketEventInterface::CHANNEL_ALIVE;
+}
+
+ChannelState WebSocketImpl::WebSocketEventHandler::OnSSLCertificateError(
+    std::unique_ptr<net::WebSocketEventInterface::SSLErrorCallbacks> callbacks,
+    const GURL& url,
+    const net::SSLInfo& ssl_info,
+    bool fatal) {
+  DVLOG(3) << "WebSocketEventHandler::OnSSLCertificateError"
+           << reinterpret_cast<void*>(this) << " url=" << url.spec()
+           << " cert_status=" << ssl_info.cert_status << " fatal=" << fatal;
+  ssl_error_handler_delegate_.reset(
+      new SSLErrorHandlerDelegate(std::move(callbacks)));
+  SSLManager::OnSSLCertificateSubresourceError(
+      ssl_error_handler_delegate_->GetWeakPtr(),
+      url,
+      impl_->delegate_->GetClientProcessId(),
+      impl_->frame_id_,
+      ssl_info,
+      fatal);
+  // The above method is always asynchronous.
+  return WebSocketEventInterface::CHANNEL_ALIVE;
+}
+
+WebSocketImpl::WebSocketEventHandler::SSLErrorHandlerDelegate::
+    SSLErrorHandlerDelegate(
+        std::unique_ptr<net::WebSocketEventInterface::SSLErrorCallbacks>
+            callbacks)
+    : callbacks_(std::move(callbacks)), weak_ptr_factory_(this) {}
+
+WebSocketImpl::WebSocketEventHandler::SSLErrorHandlerDelegate::
+    ~SSLErrorHandlerDelegate() {}
+
+base::WeakPtr<SSLErrorHandler::Delegate>
+WebSocketImpl::WebSocketEventHandler::SSLErrorHandlerDelegate::GetWeakPtr() {
+  return weak_ptr_factory_.GetWeakPtr();
+}
+
+void WebSocketImpl::WebSocketEventHandler::SSLErrorHandlerDelegate::
+    CancelSSLRequest(int error, const net::SSLInfo* ssl_info) {
+  DVLOG(3) << "SSLErrorHandlerDelegate::CancelSSLRequest"
+           << " error=" << error
+           << " cert_status=" << (ssl_info ? ssl_info->cert_status
+                                           : static_cast<net::CertStatus>(-1));
+  callbacks_->CancelSSLRequest(error, ssl_info);
+}
+
+void WebSocketImpl::WebSocketEventHandler::SSLErrorHandlerDelegate::
+    ContinueSSLRequest() {
+  DVLOG(3) << "SSLErrorHandlerDelegate::ContinueSSLRequest";
+  callbacks_->ContinueSSLRequest();
+}
+
+WebSocketImpl::WebSocketImpl(
+    Delegate* delegate,
+    mojom::WebSocketRequest request,
+    int frame_id,
+    base::TimeDelta delay)
+    : delegate_(delegate),
+      binding_(this, std::move(request)),
+      delay_(delay),
+      pending_flow_control_quota_(0),
+      frame_id_(frame_id),
+      handshake_succeeded_(false),
+      weak_ptr_factory_(this) {
+  binding_.set_connection_error_handler(
+      base::Bind(&WebSocketImpl::OnConnectionError, base::Unretained(this)));
+}
+
+WebSocketImpl::~WebSocketImpl() {}
+
+void WebSocketImpl::GoAway() {
+  StartClosingHandshake(static_cast<uint16_t>(net::kWebSocketErrorGoingAway),
+                        "");
+}
+
+void WebSocketImpl::AddChannelRequest(
+    const GURL& socket_url,
+    mojo::Array<mojo::String> requested_protocols_mojo,
+    const url::Origin& origin,
+    const GURL& first_party_for_cookies,
+    const mojo::String& user_agent_override,
+    mojom::WebSocketClientPtr client) {
+  // Convert to STL types.
+  std::vector<std::string> requested_protocols(
+      requested_protocols_mojo.begin(),
+      requested_protocols_mojo.end());
+
+  DVLOG(3) << "WebSocketImpl::AddChannelRequest @"
+           << reinterpret_cast<void*>(this)
+           << " socket_url=\"" << socket_url << "\" requested_protocols=\""
+           << base::JoinString(requested_protocols, ", ")
+           << "\" origin=\"" << origin
+           << "\" first_party_for_cookies=\"" << first_party_for_cookies
+           << "\" user_agent_override=\"" << user_agent_override
+           << "\"";
+
+  if (client_ || !client) {
+    bad_message::ReceivedBadMessage(
+        delegate_->GetClientProcessId(),
+        bad_message::WSI_UNEXPECTED_ADD_CHANNEL_REQUEST);
+    return;
+  }
+
+  client_ = std::move(client);
+
+  DCHECK(!channel_);
+  if (delay_ > base::TimeDelta()) {
+    base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
+        FROM_HERE,
+        base::Bind(&WebSocketImpl::AddChannel,
+                   weak_ptr_factory_.GetWeakPtr(),
+                   socket_url,
+                   requested_protocols,
+                   origin,
+                   first_party_for_cookies,
+                   user_agent_override),
+        delay_);
+  } else {
+    AddChannel(socket_url, requested_protocols, origin, first_party_for_cookies,
+               user_agent_override);
+  }
+}
+
+void WebSocketImpl::SendFrame(bool fin, mojom::WebSocketMessageType type,
+                              mojo::Array<uint8_t> data) {
+  DVLOG(3) << "WebSocketImpl::SendFrame @"
+           << reinterpret_cast<void*>(this) << " fin=" << fin
+           << " type=" << type << " data is " << data.size() << " bytes";
+
+  if (!channel_) {
+    // The client should not be sending us frames until after we've informed
+    // it that the channel has been opened (OnAddChannelResponse).
+    if (handshake_succeeded_) {
+      DVLOG(1) << "Dropping frame sent to closed websocket";
+    } else {
+      bad_message::ReceivedBadMessage(
+          delegate_->GetClientProcessId(),
+          bad_message::WSI_UNEXPECTED_SEND_FRAME);
+    }
+    return;
+  }
+
+  // TODO(darin): Avoid this copy.
+  std::vector<char> data_to_pass(data.size());
+  std::copy(data.begin(), data.end(), data_to_pass.begin());
+
+  channel_->SendFrame(fin, MessageTypeToOpCode(type), data_to_pass);
+}
+
+void WebSocketImpl::SendFlowControl(int64_t quota) {
+  DVLOG(3) << "WebSocketImpl::OnFlowControl @"
+           << reinterpret_cast<void*>(this) << " quota=" << quota;
+
+  if (!channel_) {
+    // WebSocketChannel is not yet created due to the delay introduced by
+    // per-renderer WebSocket throttling.
+    // SendFlowControl() is called after WebSocketChannel is created.
+    pending_flow_control_quota_ += quota;
+    return;
+  }
+
+  ignore_result(channel_->SendFlowControl(quota));
+}
+
+void WebSocketImpl::StartClosingHandshake(uint16_t code,
+                                          const mojo::String& reason) {
+  DVLOG(3) << "WebSocketImpl::StartClosingHandshake @"
+           << reinterpret_cast<void*>(this)
+           << " code=" << code << " reason=\"" << reason << "\"";
+
+  if (!channel_) {
+    // WebSocketChannel is not yet created due to the delay introduced by
+    // per-renderer WebSocket throttling.
+    if (client_)
+      client_->OnDropChannel(false, net::kWebSocketErrorAbnormalClosure, "");
+    return;
+  }
+
+  ignore_result(channel_->StartClosingHandshake(code, reason));
+}
+
+void WebSocketImpl::OnConnectionError() {
+  DVLOG(3) << "WebSocketImpl::OnConnectionError @"
+           << reinterpret_cast<void*>(this);
+
+  delegate_->OnLostConnectionToClient(this);
+}
+
+void WebSocketImpl::AddChannel(
+    const GURL& socket_url,
+    const std::vector<std::string>& requested_protocols,
+    const url::Origin& origin,
+    const GURL& first_party_for_cookies,
+    const std::string& user_agent_override) {
+  DVLOG(3) << "WebSocketImpl::AddChannel @"
+           << reinterpret_cast<void*>(this)
+           << " socket_url=\"" << socket_url
+           << "\" requested_protocols=\""
+           << base::JoinString(requested_protocols, ", ")
+           << "\" origin=\"" << origin
+           << "\" first_party_for_cookies=\"" << first_party_for_cookies
+           << "\" user_agent_override=\"" << user_agent_override
+           << "\"";
+
+  DCHECK(!channel_);
+
+  StoragePartition* partition = delegate_->GetStoragePartition();
+
+  std::unique_ptr<net::WebSocketEventInterface> event_interface(
+      new WebSocketEventHandler(this));
+  channel_.reset(
+      new net::WebSocketChannel(
+          std::move(event_interface),
+          partition->GetURLRequestContext()->GetURLRequestContext()));
+
+  int64_t quota = pending_flow_control_quota_;
+  pending_flow_control_quota_ = 0;
+
+  std::string additional_headers;
+  if (!user_agent_override.empty()) {
+    if (!net::HttpUtil::IsValidHeaderValue(user_agent_override)) {
+      bad_message::ReceivedBadMessage(
+          delegate_->GetClientProcessId(),
+          bad_message::WSI_INVALID_HEADER_VALUE);
+      return;
+    }
+    additional_headers = base::StringPrintf("%s:%s",
+                                            net::HttpRequestHeaders::kUserAgent,
+                                            user_agent_override.c_str());
+  }
+  channel_->SendAddChannelRequest(socket_url, requested_protocols, origin,
+                                  first_party_for_cookies, additional_headers);
+  if (quota > 0)
+    SendFlowControl(quota);
+}
+
+}  // namespace content