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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 "content/browser/ppapi_plugin_process_host.h"
      6 
      7 #include <string>
      8 
      9 #include "base/base_switches.h"
     10 #include "base/command_line.h"
     11 #include "base/files/file_path.h"
     12 #include "base/metrics/field_trial.h"
     13 #include "base/strings/utf_string_conversions.h"
     14 #include "content/browser/browser_child_process_host_impl.h"
     15 #include "content/browser/plugin_service_impl.h"
     16 #include "content/browser/renderer_host/render_message_filter.h"
     17 #include "content/common/child_process_host_impl.h"
     18 #include "content/common/child_process_messages.h"
     19 #include "content/public/browser/content_browser_client.h"
     20 #include "content/public/common/content_constants.h"
     21 #include "content/public/common/content_switches.h"
     22 #include "content/public/common/pepper_plugin_info.h"
     23 #include "content/public/common/process_type.h"
     24 #include "ipc/ipc_switches.h"
     25 #include "net/base/network_change_notifier.h"
     26 #include "ppapi/proxy/ppapi_messages.h"
     27 #include "ui/base/ui_base_switches.h"
     28 
     29 #if defined(OS_WIN)
     30 #include "content/common/sandbox_win.h"
     31 #include "content/public/common/sandboxed_process_launcher_delegate.h"
     32 #include "sandbox/win/src/sandbox_policy.h"
     33 #endif
     34 
     35 namespace content {
     36 
     37 #if defined(OS_WIN)
     38 // NOTE: changes to this class need to be reviewed by the security team.
     39 class PpapiPluginSandboxedProcessLauncherDelegate
     40     : public content::SandboxedProcessLauncherDelegate {
     41  public:
     42   explicit PpapiPluginSandboxedProcessLauncherDelegate(bool is_broker)
     43       : is_broker_(is_broker) {}
     44   virtual ~PpapiPluginSandboxedProcessLauncherDelegate() {}
     45 
     46   virtual void ShouldSandbox(bool* in_sandbox) OVERRIDE {
     47     if (is_broker_)
     48       *in_sandbox = false;
     49   }
     50 
     51   virtual void PreSpawnTarget(sandbox::TargetPolicy* policy,
     52                               bool* success) {
     53     if (is_broker_)
     54       return;
     55     // The Pepper process as locked-down as a renderer execpt that it can
     56     // create the server side of chrome pipes.
     57     sandbox::ResultCode result;
     58     result = policy->AddRule(sandbox::TargetPolicy::SUBSYS_NAMED_PIPES,
     59                              sandbox::TargetPolicy::NAMEDPIPES_ALLOW_ANY,
     60                              L"\\\\.\\pipe\\chrome.*");
     61     *success = (result == sandbox::SBOX_ALL_OK);
     62   }
     63 
     64  private:
     65   bool is_broker_;
     66 
     67   DISALLOW_COPY_AND_ASSIGN(PpapiPluginSandboxedProcessLauncherDelegate);
     68 };
     69 #endif  // OS_WIN
     70 
     71 class PpapiPluginProcessHost::PluginNetworkObserver
     72     : public net::NetworkChangeNotifier::IPAddressObserver,
     73       public net::NetworkChangeNotifier::ConnectionTypeObserver {
     74  public:
     75   explicit PluginNetworkObserver(PpapiPluginProcessHost* process_host)
     76       : process_host_(process_host) {
     77     net::NetworkChangeNotifier::AddIPAddressObserver(this);
     78     net::NetworkChangeNotifier::AddConnectionTypeObserver(this);
     79   }
     80 
     81   virtual ~PluginNetworkObserver() {
     82     net::NetworkChangeNotifier::RemoveConnectionTypeObserver(this);
     83     net::NetworkChangeNotifier::RemoveIPAddressObserver(this);
     84   }
     85 
     86   // IPAddressObserver implementation.
     87   virtual void OnIPAddressChanged() OVERRIDE {
     88     // TODO(brettw) bug 90246: This doesn't seem correct. The online/offline
     89     // notification seems like it should be sufficient, but I don't see that
     90     // when I unplug and replug my network cable. Sending this notification when
     91     // "something" changes seems to make Flash reasonably happy, but seems
     92     // wrong. We should really be able to provide the real online state in
     93     // OnConnectionTypeChanged().
     94     process_host_->Send(new PpapiMsg_SetNetworkState(true));
     95   }
     96 
     97   // ConnectionTypeObserver implementation.
     98   virtual void OnConnectionTypeChanged(
     99       net::NetworkChangeNotifier::ConnectionType type) OVERRIDE {
    100     process_host_->Send(new PpapiMsg_SetNetworkState(
    101         type != net::NetworkChangeNotifier::CONNECTION_NONE));
    102   }
    103 
    104  private:
    105   PpapiPluginProcessHost* const process_host_;
    106 };
    107 
    108 PpapiPluginProcessHost::~PpapiPluginProcessHost() {
    109   DVLOG(1) << "PpapiPluginProcessHost" << (is_broker_ ? "[broker]" : "")
    110            << "~PpapiPluginProcessHost()";
    111   CancelRequests();
    112 }
    113 
    114 // static
    115 PpapiPluginProcessHost* PpapiPluginProcessHost::CreatePluginHost(
    116     const PepperPluginInfo& info,
    117     const base::FilePath& profile_data_directory,
    118     net::HostResolver* host_resolver) {
    119   PpapiPluginProcessHost* plugin_host = new PpapiPluginProcessHost(
    120       info, profile_data_directory, host_resolver);
    121   if (plugin_host->Init(info))
    122     return plugin_host;
    123 
    124   NOTREACHED();  // Init is not expected to fail.
    125   return NULL;
    126 }
    127 
    128 // static
    129 PpapiPluginProcessHost* PpapiPluginProcessHost::CreateBrokerHost(
    130     const PepperPluginInfo& info) {
    131   PpapiPluginProcessHost* plugin_host =
    132       new PpapiPluginProcessHost();
    133   if (plugin_host->Init(info))
    134     return plugin_host;
    135 
    136   NOTREACHED();  // Init is not expected to fail.
    137   return NULL;
    138 }
    139 
    140 // static
    141 void PpapiPluginProcessHost::DidCreateOutOfProcessInstance(
    142     int plugin_process_id,
    143     int32 pp_instance,
    144     const PepperRendererInstanceData& instance_data) {
    145   for (PpapiPluginProcessHostIterator iter; !iter.Done(); ++iter) {
    146     if (iter->process_.get() &&
    147         iter->process_->GetData().id == plugin_process_id) {
    148       // Found the plugin.
    149       iter->host_impl_->AddInstance(pp_instance, instance_data);
    150       return;
    151     }
    152   }
    153   // We'll see this passed with a 0 process ID for the browser tag stuff that
    154   // is currently in the process of being removed.
    155   //
    156   // TODO(brettw) When old browser tag impl is removed
    157   // (PepperPluginDelegateImpl::CreateBrowserPluginModule passes a 0 plugin
    158   // process ID) this should be converted to a NOTREACHED().
    159   DCHECK(plugin_process_id == 0)
    160       << "Renderer sent a bad plugin process host ID";
    161 }
    162 
    163 // static
    164 void PpapiPluginProcessHost::DidDeleteOutOfProcessInstance(
    165     int plugin_process_id,
    166     int32 pp_instance) {
    167   for (PpapiPluginProcessHostIterator iter; !iter.Done(); ++iter) {
    168     if (iter->process_.get() &&
    169         iter->process_->GetData().id == plugin_process_id) {
    170       // Found the plugin.
    171       iter->host_impl_->DeleteInstance(pp_instance);
    172       return;
    173     }
    174   }
    175   // Note: It's possible that the plugin process has already been deleted by
    176   // the time this message is received. For example, it could have crashed.
    177   // That's OK, we can just ignore this message.
    178 }
    179 
    180 // static
    181 void PpapiPluginProcessHost::FindByName(
    182     const string16& name,
    183     std::vector<PpapiPluginProcessHost*>* hosts) {
    184   for (PpapiPluginProcessHostIterator iter; !iter.Done(); ++iter) {
    185     if (iter->process_.get() && iter->process_->GetData().name == name)
    186       hosts->push_back(*iter);
    187   }
    188 }
    189 
    190 bool PpapiPluginProcessHost::Send(IPC::Message* message) {
    191   return process_->Send(message);
    192 }
    193 
    194 void PpapiPluginProcessHost::OpenChannelToPlugin(Client* client) {
    195   if (process_->GetHost()->IsChannelOpening()) {
    196     // The channel is already in the process of being opened.  Put
    197     // this "open channel" request into a queue of requests that will
    198     // be run once the channel is open.
    199     pending_requests_.push_back(client);
    200     return;
    201   }
    202 
    203   // We already have an open channel, send a request right away to plugin.
    204   RequestPluginChannel(client);
    205 }
    206 
    207 PpapiPluginProcessHost::PpapiPluginProcessHost(
    208     const PepperPluginInfo& info,
    209     const base::FilePath& profile_data_directory,
    210     net::HostResolver* host_resolver)
    211     : permissions_(
    212           ppapi::PpapiPermissions::GetForCommandLine(info.permissions)),
    213       profile_data_directory_(profile_data_directory),
    214       is_broker_(false) {
    215   process_.reset(new BrowserChildProcessHostImpl(
    216       PROCESS_TYPE_PPAPI_PLUGIN, this));
    217 
    218   filter_ = new PepperMessageFilter(permissions_, host_resolver);
    219 
    220   host_impl_.reset(new BrowserPpapiHostImpl(this, permissions_, info.name,
    221                                             info.path, profile_data_directory,
    222                                             false,
    223                                             filter_));
    224 
    225   process_->GetHost()->AddFilter(filter_.get());
    226   process_->GetHost()->AddFilter(host_impl_->message_filter().get());
    227 
    228   GetContentClient()->browser()->DidCreatePpapiPlugin(host_impl_.get());
    229 
    230   // Only request network status updates if the plugin has dev permissions.
    231   if (permissions_.HasPermission(ppapi::PERMISSION_DEV))
    232     network_observer_.reset(new PluginNetworkObserver(this));
    233 }
    234 
    235 PpapiPluginProcessHost::PpapiPluginProcessHost()
    236     : is_broker_(true) {
    237   process_.reset(new BrowserChildProcessHostImpl(
    238       PROCESS_TYPE_PPAPI_BROKER, this));
    239 
    240   ppapi::PpapiPermissions permissions;  // No permissions.
    241   // The plugin name, path and profile data directory shouldn't be needed for
    242   // the broker.
    243   host_impl_.reset(new BrowserPpapiHostImpl(this, permissions,
    244                                             std::string(), base::FilePath(),
    245                                             base::FilePath(),
    246                                             false,
    247                                             NULL));
    248 }
    249 
    250 bool PpapiPluginProcessHost::Init(const PepperPluginInfo& info) {
    251   plugin_path_ = info.path;
    252   if (info.name.empty()) {
    253     process_->SetName(plugin_path_.BaseName().LossyDisplayName());
    254   } else {
    255     process_->SetName(UTF8ToUTF16(info.name));
    256   }
    257 
    258   std::string channel_id = process_->GetHost()->CreateChannel();
    259   if (channel_id.empty())
    260     return false;
    261 
    262   const CommandLine& browser_command_line = *CommandLine::ForCurrentProcess();
    263   CommandLine::StringType plugin_launcher =
    264       browser_command_line.GetSwitchValueNative(switches::kPpapiPluginLauncher);
    265 
    266 #if defined(OS_LINUX)
    267   int flags = plugin_launcher.empty() ? ChildProcessHost::CHILD_ALLOW_SELF :
    268                                         ChildProcessHost::CHILD_NORMAL;
    269 #else
    270   int flags = ChildProcessHost::CHILD_NORMAL;
    271 #endif
    272   base::FilePath exe_path = ChildProcessHost::GetChildPath(flags);
    273   if (exe_path.empty())
    274     return false;
    275 
    276   CommandLine* cmd_line = new CommandLine(exe_path);
    277   cmd_line->AppendSwitchASCII(switches::kProcessType,
    278                               is_broker_ ? switches::kPpapiBrokerProcess
    279                                          : switches::kPpapiPluginProcess);
    280   cmd_line->AppendSwitchASCII(switches::kProcessChannelID, channel_id);
    281 
    282   // These switches are forwarded to both plugin and broker pocesses.
    283   static const char* kCommonForwardSwitches[] = {
    284     switches::kVModule
    285   };
    286   cmd_line->CopySwitchesFrom(browser_command_line, kCommonForwardSwitches,
    287                              arraysize(kCommonForwardSwitches));
    288 
    289   if (!is_broker_) {
    290     static const char* kPluginForwardSwitches[] = {
    291       switches::kDisableSeccompFilterSandbox,
    292 #if defined(OS_MACOSX)
    293       switches::kEnableSandboxLogging,
    294 #endif
    295       switches::kNoSandbox,
    296       switches::kPpapiStartupDialog,
    297     };
    298     cmd_line->CopySwitchesFrom(browser_command_line, kPluginForwardSwitches,
    299                                arraysize(kPluginForwardSwitches));
    300 
    301     // Copy any flash args over and introduce field trials if necessary.
    302     // TODO(vtl): Stop passing flash args in the command line, or windows is
    303     // going to explode.
    304     std::string field_trial =
    305         base::FieldTrialList::FindFullName(kLowLatencyFlashAudioFieldTrialName);
    306     std::string existing_args =
    307         browser_command_line.GetSwitchValueASCII(switches::kPpapiFlashArgs);
    308     if (field_trial == kLowLatencyFlashAudioFieldTrialEnabledName)
    309       existing_args.append(" enable_low_latency_audio=1");
    310     cmd_line->AppendSwitchASCII(switches::kPpapiFlashArgs, existing_args);
    311   }
    312 
    313   std::string locale = GetContentClient()->browser()->GetApplicationLocale();
    314   if (!locale.empty()) {
    315     // Pass on the locale so the plugin will know what language we're using.
    316     cmd_line->AppendSwitchASCII(switches::kLang, locale);
    317   }
    318 
    319   if (!plugin_launcher.empty())
    320     cmd_line->PrependWrapper(plugin_launcher);
    321 
    322   // On posix, never use the zygote for the broker. Also, only use the zygote if
    323   // the plugin is sandboxed, and we are not using a plugin launcher - having a
    324   // plugin launcher means we need to use another process instead of just
    325   // forking the zygote.
    326 #if defined(OS_POSIX)
    327   bool use_zygote = !is_broker_ && plugin_launcher.empty() && info.is_sandboxed;
    328   if (!info.is_sandboxed)
    329     cmd_line->AppendSwitchASCII(switches::kNoSandbox, std::string());
    330 #endif  // OS_POSIX
    331   process_->Launch(
    332 #if defined(OS_WIN)
    333       new PpapiPluginSandboxedProcessLauncherDelegate(is_broker_),
    334 #elif defined(OS_POSIX)
    335       use_zygote,
    336       base::EnvironmentVector(),
    337 #endif
    338       cmd_line);
    339   return true;
    340 }
    341 
    342 void PpapiPluginProcessHost::RequestPluginChannel(Client* client) {
    343   base::ProcessHandle process_handle;
    344   int renderer_child_id;
    345   client->GetPpapiChannelInfo(&process_handle, &renderer_child_id);
    346 
    347   base::ProcessId process_id = (process_handle == base::kNullProcessHandle) ?
    348       0 : base::GetProcId(process_handle);
    349 
    350   // We can't send any sync messages from the browser because it might lead to
    351   // a hang. See the similar code in PluginProcessHost for more description.
    352   PpapiMsg_CreateChannel* msg = new PpapiMsg_CreateChannel(
    353       process_id, renderer_child_id, client->OffTheRecord());
    354   msg->set_unblock(true);
    355   if (Send(msg)) {
    356     sent_requests_.push(client);
    357   } else {
    358     client->OnPpapiChannelOpened(IPC::ChannelHandle(), base::kNullProcessId, 0);
    359   }
    360 }
    361 
    362 void PpapiPluginProcessHost::OnProcessLaunched() {
    363   host_impl_->set_plugin_process_handle(process_->GetHandle());
    364 }
    365 
    366 void PpapiPluginProcessHost::OnProcessCrashed(int exit_code) {
    367   PluginServiceImpl::GetInstance()->RegisterPluginCrash(plugin_path_);
    368 }
    369 
    370 bool PpapiPluginProcessHost::OnMessageReceived(const IPC::Message& msg) {
    371   bool handled = true;
    372   IPC_BEGIN_MESSAGE_MAP(PpapiPluginProcessHost, msg)
    373     IPC_MESSAGE_HANDLER(PpapiHostMsg_ChannelCreated,
    374                         OnRendererPluginChannelCreated)
    375     IPC_MESSAGE_UNHANDLED(handled = false)
    376   IPC_END_MESSAGE_MAP()
    377   DCHECK(handled);
    378   return handled;
    379 }
    380 
    381 // Called when the browser <--> plugin channel has been established.
    382 void PpapiPluginProcessHost::OnChannelConnected(int32 peer_pid) {
    383   // This will actually load the plugin. Errors will actually not be reported
    384   // back at this point. Instead, the plugin will fail to establish the
    385   // connections when we request them on behalf of the renderer(s).
    386   Send(new PpapiMsg_LoadPlugin(plugin_path_, permissions_));
    387 
    388   // Process all pending channel requests from the renderers.
    389   for (size_t i = 0; i < pending_requests_.size(); i++)
    390     RequestPluginChannel(pending_requests_[i]);
    391   pending_requests_.clear();
    392 }
    393 
    394 // Called when the browser <--> plugin channel has an error. This normally
    395 // means the plugin has crashed.
    396 void PpapiPluginProcessHost::OnChannelError() {
    397   DVLOG(1) << "PpapiPluginProcessHost" << (is_broker_ ? "[broker]" : "")
    398            << "::OnChannelError()";
    399   // We don't need to notify the renderers that were communicating with the
    400   // plugin since they have their own channels which will go into the error
    401   // state at the same time. Instead, we just need to notify any renderers
    402   // that have requested a connection but have not yet received one.
    403   CancelRequests();
    404 }
    405 
    406 void PpapiPluginProcessHost::CancelRequests() {
    407   DVLOG(1) << "PpapiPluginProcessHost" << (is_broker_ ? "[broker]" : "")
    408            << "CancelRequests()";
    409   for (size_t i = 0; i < pending_requests_.size(); i++) {
    410     pending_requests_[i]->OnPpapiChannelOpened(IPC::ChannelHandle(),
    411                                                base::kNullProcessId, 0);
    412   }
    413   pending_requests_.clear();
    414 
    415   while (!sent_requests_.empty()) {
    416     sent_requests_.front()->OnPpapiChannelOpened(IPC::ChannelHandle(),
    417                                                  base::kNullProcessId, 0);
    418     sent_requests_.pop();
    419   }
    420 }
    421 
    422 // Called when a new plugin <--> renderer channel has been created.
    423 void PpapiPluginProcessHost::OnRendererPluginChannelCreated(
    424     const IPC::ChannelHandle& channel_handle) {
    425   if (sent_requests_.empty())
    426     return;
    427 
    428   // All requests should be processed FIFO, so the next item in the
    429   // sent_requests_ queue should be the one that the plugin just created.
    430   Client* client = sent_requests_.front();
    431   sent_requests_.pop();
    432 
    433   const ChildProcessData& data = process_->GetData();
    434   client->OnPpapiChannelOpened(channel_handle, base::GetProcId(data.handle),
    435                                data.id);
    436 }
    437 
    438 }  // namespace content
    439