content/browser/plugin_data_remover_impl.cc

   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 "content/browser/plugin_data_remover_impl.h"
   6
   7 #include <limits>
   8
   9 #include "base/bind.h"
  10 #include "base/metrics/histogram.h"
  11 #include "base/sequenced_task_runner_helpers.h"
  12 #include "base/strings/utf_string_conversions.h"
  13 #include "base/synchronization/waitable_event.h"
  14 #include "base/version.h"
  15 #include "content/browser/plugin_process_host.h"
  16 #include "content/browser/plugin_service_impl.h"
  17 #include "content/browser/renderer_host/pepper/pepper_flash_file_message_filter.h"
  18 #include "content/common/child_process_host_impl.h"
  19 #include "content/common/plugin_process_messages.h"
  20 #include "content/public/browser/browser_context.h"
  21 #include "content/public/browser/browser_thread.h"
  22 #include "content/public/common/child_process_host.h"
  23 #include "content/public/common/content_constants.h"
  24 #include "content/public/common/pepper_plugin_info.h"
  25 #include "ppapi/proxy/ppapi_messages.h"
  26
  27 namespace content {
  28
  29 namespace {
  30
  31 // The minimum Flash Player version that implements NPP_ClearSiteData.
  32 const char kMinFlashVersion[] = "10.3";
  33 const int64 kRemovalTimeoutMs = 10000;
  34 const uint64 kClearAllData = 0;
  35
  36 }  // namespace
  37
  38 // static
  39 PluginDataRemover* PluginDataRemover::Create(BrowserContext* browser_context) {
  40   return new PluginDataRemoverImpl(browser_context);
  41 }
  42
  43 // static
  44 void PluginDataRemover::GetSupportedPlugins(
  45     std::vector<WebPluginInfo>* supported_plugins) {
  46   bool allow_wildcard = false;
  47   std::vector<WebPluginInfo> plugins;
  48   PluginService::GetInstance()->GetPluginInfoArray(
  49       GURL(), kFlashPluginSwfMimeType, allow_wildcard, &plugins, NULL);
  50   Version min_version(kMinFlashVersion);
  51   for (std::vector<WebPluginInfo>::iterator it = plugins.begin();
  52        it != plugins.end(); ++it) {
  53     Version version;
  54     WebPluginInfo::CreateVersionFromString(it->version, &version);
  55     if (version.IsValid() && min_version.CompareTo(version) == -1)
  56       supported_plugins->push_back(*it);
  57   }
  58 }
  59
  60 class PluginDataRemoverImpl::Context
  61     : public PluginProcessHost::Client,
  62       public PpapiPluginProcessHost::BrokerClient,
  63       public IPC::Listener,
  64       public base::RefCountedThreadSafe<Context,
  65                                         BrowserThread::DeleteOnIOThread> {
  66  public:
  67   Context(base::Time begin_time, BrowserContext* browser_context)
  68       : event_(new base::WaitableEvent(true, false)),
  69         begin_time_(begin_time),
  70         is_removing_(false),
  71         browser_context_path_(browser_context->GetPath()),
  72         resource_context_(browser_context->GetResourceContext()) {
  73     DCHECK_CURRENTLY_ON(BrowserThread::UI);
  74   }
  75
  76   void Init(const std::string& mime_type) {
  77     BrowserThread::PostTask(
  78         BrowserThread::IO,
  79         FROM_HERE,
  80         base::Bind(&Context::InitOnIOThread, this, mime_type));
  81     BrowserThread::PostDelayedTask(
  82         BrowserThread::IO,
  83         FROM_HERE,
  84         base::Bind(&Context::OnTimeout, this),
  85         base::TimeDelta::FromMilliseconds(kRemovalTimeoutMs));
  86   }
  87
  88   void InitOnIOThread(const std::string& mime_type) {
  89     PluginServiceImpl* plugin_service = PluginServiceImpl::GetInstance();
  90
  91     // Get the plugin file path.
  92     std::vector<WebPluginInfo> plugins;
  93     plugin_service->GetPluginInfoArray(
  94         GURL(), mime_type, false, &plugins, NULL);
  95
  96     if (plugins.empty()) {
  97       // May be empty for some tests and on the CrOS login OOBE screen.
  98       event_->Signal();
  99       return;
 100     }
 101
 102     base::FilePath plugin_path = plugins[0].path;
 103
 104     DCHECK_CURRENTLY_ON(BrowserThread::IO);
 105     remove_start_time_ = base::Time::Now();
 106     is_removing_ = true;
 107     // Balanced in On[Ppapi]ChannelOpened or OnError. Exactly one them will
 108     // eventually be called, so we need to keep this object around until then.
 109     AddRef();
 110
 111     PepperPluginInfo* pepper_info =
 112         plugin_service->GetRegisteredPpapiPluginInfo(plugin_path);
 113     if (pepper_info) {
 114       plugin_name_ = pepper_info->name;
 115       // Use the broker since we run this function outside the sandbox.
 116       plugin_service->OpenChannelToPpapiBroker(0, plugin_path, this);
 117     } else {
 118       plugin_service->OpenChannelToNpapiPlugin(
 119           0, 0, GURL(), GURL(), mime_type, this);
 120     }
 121   }
 122
 123   // Called when a timeout happens in order not to block the client
 124   // indefinitely.
 125   void OnTimeout() {
 126     LOG_IF(ERROR, is_removing_) << "Timed out";
 127     SignalDone();
 128   }
 129
 130   // PluginProcessHost::Client methods.
 131   int ID() override {
 132     // Generate a unique identifier for this PluginProcessHostClient.
 133     return ChildProcessHostImpl::GenerateChildProcessUniqueId();
 134   }
 135
 136   bool OffTheRecord() override { return false; }
 137
 138   ResourceContext* GetResourceContext() override { return resource_context_; }
 139
 140   void SetPluginInfo(const WebPluginInfo& info) override {}
 141
 142   void OnFoundPluginProcessHost(PluginProcessHost* host) override {}
 143
 144   void OnSentPluginChannelRequest() override {}
 145
 146   void OnChannelOpened(const IPC::ChannelHandle& handle) override {
 147     ConnectToChannel(handle, false);
 148     // Balancing the AddRef call.
 149     Release();
 150   }
 151
 152   void OnError() override {
 153     LOG(ERROR) << "Couldn't open plugin channel";
 154     SignalDone();
 155     // Balancing the AddRef call.
 156     Release();
 157   }
 158
 159   // PpapiPluginProcessHost::BrokerClient implementation.
 160   void GetPpapiChannelInfo(base::ProcessHandle* renderer_handle,
 161                            int* renderer_id) override {
 162     *renderer_handle = base::kNullProcessHandle;
 163     *renderer_id = 0;
 164   }
 165
 166   void OnPpapiChannelOpened(const IPC::ChannelHandle& channel_handle,
 167                             base::ProcessId /* peer_pid */,
 168                             int /* child_id */) override {
 169     if (!channel_handle.name.empty())
 170       ConnectToChannel(channel_handle, true);
 171
 172     // Balancing the AddRef call.
 173     Release();
 174   }
 175
 176   // IPC::Listener methods.
 177   bool OnMessageReceived(const IPC::Message& message) override {
 178     IPC_BEGIN_MESSAGE_MAP(Context, message)
 179       IPC_MESSAGE_HANDLER(PluginProcessHostMsg_ClearSiteDataResult,
 180                           OnClearSiteDataResult)
 181       IPC_MESSAGE_HANDLER(PpapiHostMsg_ClearSiteDataResult,
 182                           OnPpapiClearSiteDataResult)
 183       IPC_MESSAGE_UNHANDLED_ERROR()
 184     IPC_END_MESSAGE_MAP()
 185
 186     return true;
 187   }
 188
 189   void OnChannelError() override {
 190     if (is_removing_) {
 191       NOTREACHED() << "Channel error";
 192       SignalDone();
 193     }
 194   }
 195
 196   base::WaitableEvent* event() { return event_.get(); }
 197
 198  private:
 199   friend struct BrowserThread::DeleteOnThread<BrowserThread::IO>;
 200   friend class base::DeleteHelper<Context>;
 201   ~Context() override {}
 202
 203   IPC::Message* CreatePpapiClearSiteDataMsg(uint64 max_age) {
 204     base::FilePath profile_path =
 205         PepperFlashFileMessageFilter::GetDataDirName(browser_context_path_);
 206     // TODO(vtl): This "duplicates" logic in webkit/plugins/ppapi/file_path.cc
 207     // (which prepends the plugin name to the relative part of the path
 208     // instead, with the absolute, profile-dependent part being enforced by
 209     // the browser).
 210 #if defined(OS_WIN)
 211     base::FilePath plugin_data_path =
 212         profile_path.Append(base::FilePath(base::UTF8ToUTF16(plugin_name_)));
 213 #else
 214     base::FilePath plugin_data_path =
 215         profile_path.Append(base::FilePath(plugin_name_));
 216 #endif  // defined(OS_WIN)
 217     return new PpapiMsg_ClearSiteData(0u, plugin_data_path, std::string(),
 218                                       kClearAllData, max_age);
 219   }
 220
 221   // Connects the client side of a newly opened plugin channel.
 222   void ConnectToChannel(const IPC::ChannelHandle& handle, bool is_ppapi) {
 223     DCHECK_CURRENTLY_ON(BrowserThread::IO);
 224
 225     // If we timed out, don't bother connecting.
 226     if (!is_removing_)
 227       return;
 228
 229     DCHECK(!channel_.get());
 230     channel_ = IPC::Channel::CreateClient(
 231         handle, this, content::ChildProcessHost::GetAttachmentBroker());
 232     if (!channel_->Connect()) {
 233       NOTREACHED() << "Couldn't connect to plugin";
 234       SignalDone();
 235       return;
 236     }
 237
 238     uint64 max_age = begin_time_.is_null() ?
 239         std::numeric_limits<uint64>::max() :
 240         (base::Time::Now() - begin_time_).InSeconds();
 241
 242     IPC::Message* msg;
 243     if (is_ppapi) {
 244       msg = CreatePpapiClearSiteDataMsg(max_age);
 245     } else {
 246       msg = new PluginProcessMsg_ClearSiteData(
 247           std::string(), kClearAllData, max_age);
 248     }
 249     if (!channel_->Send(msg)) {
 250       NOTREACHED() << "Couldn't send ClearSiteData message";
 251       SignalDone();
 252       return;
 253     }
 254   }
 255
 256   // Handles the PpapiHostMsg_ClearSiteDataResult message by delegating to the
 257   // PluginProcessHostMsg_ClearSiteDataResult handler.
 258   void OnPpapiClearSiteDataResult(uint32 request_id, bool success) {
 259     DCHECK_EQ(0u, request_id);
 260     OnClearSiteDataResult(success);
 261   }
 262
 263   // Handles the PluginProcessHostMsg_ClearSiteDataResult message.
 264   void OnClearSiteDataResult(bool success) {
 265     LOG_IF(ERROR, !success) << "ClearSiteData returned error";
 266     UMA_HISTOGRAM_TIMES("ClearPluginData.time",
 267                         base::Time::Now() - remove_start_time_);
 268     SignalDone();
 269   }
 270
 271   // Signals that we are finished with removing data (successful or not). This
 272   // method is safe to call multiple times.
 273   void SignalDone() {
 274     DCHECK_CURRENTLY_ON(BrowserThread::IO);
 275     if (!is_removing_)
 276       return;
 277     is_removing_ = false;
 278     event_->Signal();
 279   }
 280
 281   scoped_ptr<base::WaitableEvent> event_;
 282   // The point in time when we start removing data.
 283   base::Time remove_start_time_;
 284   // The point in time from which on we remove data.
 285   base::Time begin_time_;
 286   bool is_removing_;
 287
 288   // Path for the current profile. Must be retrieved on the UI thread from the
 289   // browser context when we start so we can use it later on the I/O thread.
 290   base::FilePath browser_context_path_;
 291
 292   // The resource context for the profile. Use only on the I/O thread.
 293   ResourceContext* resource_context_;
 294
 295   // The name of the plugin. Use only on the I/O thread.
 296   std::string plugin_name_;
 297
 298   // The channel is NULL until we have opened a connection to the plugin
 299   // process.
 300   scoped_ptr<IPC::Channel> channel_;
 301 };
 302
 303
 304 PluginDataRemoverImpl::PluginDataRemoverImpl(BrowserContext* browser_context)
 305     : mime_type_(kFlashPluginSwfMimeType),
 306       browser_context_(browser_context) {
 307 }
 308
 309 PluginDataRemoverImpl::~PluginDataRemoverImpl() {
 310 }
 311
 312 base::WaitableEvent* PluginDataRemoverImpl::StartRemoving(
 313     base::Time begin_time) {
 314   DCHECK(!context_.get());
 315   context_ = new Context(begin_time, browser_context_);
 316   context_->Init(mime_type_);
 317   return context_->event();
 318 }
 319
 320 }  // namespace content