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