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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 "content/public/common/sandboxed_process_launcher_delegate.h"
     25 #include "ipc/ipc_switches.h"
     26 #include "net/base/network_change_notifier.h"
     27 #include "ppapi/proxy/ppapi_messages.h"
     28 #include "ui/base/ui_base_switches.h"
     29 
     30 #if defined(OS_WIN)
     31 #include "content/common/sandbox_win.h"
     32 #include "sandbox/win/src/sandbox_policy.h"
     33 #endif
     34 
     35 namespace content {
     36 
     37 // NOTE: changes to this class need to be reviewed by the security team.
     38 class PpapiPluginSandboxedProcessLauncherDelegate
     39     : public content::SandboxedProcessLauncherDelegate {
     40  public:
     41   PpapiPluginSandboxedProcessLauncherDelegate(bool is_broker,
     42                                               const PepperPluginInfo& info,
     43                                               ChildProcessHost* host)
     44       :
     45 #if defined(OS_POSIX)
     46         info_(info),
     47         ipc_fd_(host->TakeClientFileDescriptor()),
     48 #endif  // OS_POSIX
     49         is_broker_(is_broker) {}
     50 
     51   virtual ~PpapiPluginSandboxedProcessLauncherDelegate() {}
     52 
     53 #if defined(OS_WIN)
     54   virtual bool ShouldSandbox() OVERRIDE {
     55     return !is_broker_;
     56   }
     57 
     58   virtual void PreSpawnTarget(sandbox::TargetPolicy* policy,
     59                               bool* success) {
     60     if (is_broker_)
     61       return;
     62     // The Pepper process as locked-down as a renderer execpt that it can
     63     // create the server side of chrome pipes.
     64     sandbox::ResultCode result;
     65     result = policy->AddRule(sandbox::TargetPolicy::SUBSYS_NAMED_PIPES,
     66                              sandbox::TargetPolicy::NAMEDPIPES_ALLOW_ANY,
     67                              L"\\\\.\\pipe\\chrome.*");
     68     *success = (result == sandbox::SBOX_ALL_OK);
     69   }
     70 
     71 #elif defined(OS_POSIX)
     72   virtual bool ShouldUseZygote() OVERRIDE {
     73     const CommandLine& browser_command_line = *CommandLine::ForCurrentProcess();
     74     CommandLine::StringType plugin_launcher = browser_command_line
     75         .GetSwitchValueNative(switches::kPpapiPluginLauncher);
     76     return !is_broker_ && plugin_launcher.empty() && info_.is_sandboxed;
     77   }
     78   virtual int GetIpcFd() OVERRIDE {
     79     return ipc_fd_;
     80   }
     81 #endif  // OS_WIN
     82 
     83  private:
     84 #if defined(OS_POSIX)
     85   const PepperPluginInfo& info_;
     86   int ipc_fd_;
     87 #endif  // OS_POSIX
     88   bool is_broker_;
     89 
     90   DISALLOW_COPY_AND_ASSIGN(PpapiPluginSandboxedProcessLauncherDelegate);
     91 };
     92 
     93 class PpapiPluginProcessHost::PluginNetworkObserver
     94     : public net::NetworkChangeNotifier::IPAddressObserver,
     95       public net::NetworkChangeNotifier::ConnectionTypeObserver {
     96  public:
     97   explicit PluginNetworkObserver(PpapiPluginProcessHost* process_host)
     98       : process_host_(process_host) {
     99     net::NetworkChangeNotifier::AddIPAddressObserver(this);
    100     net::NetworkChangeNotifier::AddConnectionTypeObserver(this);
    101   }
    102 
    103   virtual ~PluginNetworkObserver() {
    104     net::NetworkChangeNotifier::RemoveConnectionTypeObserver(this);
    105     net::NetworkChangeNotifier::RemoveIPAddressObserver(this);
    106   }
    107 
    108   // IPAddressObserver implementation.
    109   virtual void OnIPAddressChanged() OVERRIDE {
    110     // TODO(brettw) bug 90246: This doesn't seem correct. The online/offline
    111     // notification seems like it should be sufficient, but I don't see that
    112     // when I unplug and replug my network cable. Sending this notification when
    113     // "something" changes seems to make Flash reasonably happy, but seems
    114     // wrong. We should really be able to provide the real online state in
    115     // OnConnectionTypeChanged().
    116     process_host_->Send(new PpapiMsg_SetNetworkState(true));
    117   }
    118 
    119   // ConnectionTypeObserver implementation.
    120   virtual void OnConnectionTypeChanged(
    121       net::NetworkChangeNotifier::ConnectionType type) OVERRIDE {
    122     process_host_->Send(new PpapiMsg_SetNetworkState(
    123         type != net::NetworkChangeNotifier::CONNECTION_NONE));
    124   }
    125 
    126  private:
    127   PpapiPluginProcessHost* const process_host_;
    128 };
    129 
    130 PpapiPluginProcessHost::~PpapiPluginProcessHost() {
    131   DVLOG(1) << "PpapiPluginProcessHost" << (is_broker_ ? "[broker]" : "")
    132            << "~PpapiPluginProcessHost()";
    133   CancelRequests();
    134 }
    135 
    136 // static
    137 PpapiPluginProcessHost* PpapiPluginProcessHost::CreatePluginHost(
    138     const PepperPluginInfo& info,
    139     const base::FilePath& profile_data_directory) {
    140   PpapiPluginProcessHost* plugin_host = new PpapiPluginProcessHost(
    141       info, profile_data_directory);
    142   DCHECK(plugin_host);
    143   if (plugin_host->Init(info))
    144     return plugin_host;
    145 
    146   NOTREACHED();  // Init is not expected to fail.
    147   return NULL;
    148 }
    149 
    150 // static
    151 PpapiPluginProcessHost* PpapiPluginProcessHost::CreateBrokerHost(
    152     const PepperPluginInfo& info) {
    153   PpapiPluginProcessHost* plugin_host =
    154       new PpapiPluginProcessHost();
    155   if (plugin_host->Init(info))
    156     return plugin_host;
    157 
    158   NOTREACHED();  // Init is not expected to fail.
    159   return NULL;
    160 }
    161 
    162 // static
    163 void PpapiPluginProcessHost::DidCreateOutOfProcessInstance(
    164     int plugin_process_id,
    165     int32 pp_instance,
    166     const PepperRendererInstanceData& instance_data) {
    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_->AddInstance(pp_instance, instance_data);
    172       return;
    173     }
    174   }
    175   // We'll see this passed with a 0 process ID for the browser tag stuff that
    176   // is currently in the process of being removed.
    177   //
    178   // TODO(brettw) When old browser tag impl is removed
    179   // (PepperPluginDelegateImpl::CreateBrowserPluginModule passes a 0 plugin
    180   // process ID) this should be converted to a NOTREACHED().
    181   DCHECK(plugin_process_id == 0)
    182       << "Renderer sent a bad plugin process host ID";
    183 }
    184 
    185 // static
    186 void PpapiPluginProcessHost::DidDeleteOutOfProcessInstance(
    187     int plugin_process_id,
    188     int32 pp_instance) {
    189   for (PpapiPluginProcessHostIterator iter; !iter.Done(); ++iter) {
    190     if (iter->process_.get() &&
    191         iter->process_->GetData().id == plugin_process_id) {
    192       // Found the plugin.
    193       iter->host_impl_->DeleteInstance(pp_instance);
    194       return;
    195     }
    196   }
    197   // Note: It's possible that the plugin process has already been deleted by
    198   // the time this message is received. For example, it could have crashed.
    199   // That's OK, we can just ignore this message.
    200 }
    201 
    202 // static
    203 void PpapiPluginProcessHost::FindByName(
    204     const base::string16& name,
    205     std::vector<PpapiPluginProcessHost*>* hosts) {
    206   for (PpapiPluginProcessHostIterator iter; !iter.Done(); ++iter) {
    207     if (iter->process_.get() && iter->process_->GetData().name == name)
    208       hosts->push_back(*iter);
    209   }
    210 }
    211 
    212 bool PpapiPluginProcessHost::Send(IPC::Message* message) {
    213   return process_->Send(message);
    214 }
    215 
    216 void PpapiPluginProcessHost::OpenChannelToPlugin(Client* client) {
    217   if (process_->GetHost()->IsChannelOpening()) {
    218     // The channel is already in the process of being opened.  Put
    219     // this "open channel" request into a queue of requests that will
    220     // be run once the channel is open.
    221     pending_requests_.push_back(client);
    222     return;
    223   }
    224 
    225   // We already have an open channel, send a request right away to plugin.
    226   RequestPluginChannel(client);
    227 }
    228 
    229 PpapiPluginProcessHost::PpapiPluginProcessHost(
    230     const PepperPluginInfo& info,
    231     const base::FilePath& profile_data_directory)
    232     : profile_data_directory_(profile_data_directory),
    233       is_broker_(false) {
    234   uint32 base_permissions = info.permissions;
    235 
    236   // We don't have to do any whitelisting for APIs in this process host, so
    237   // don't bother passing a browser context or document url here.
    238   if (GetContentClient()->browser()->IsPluginAllowedToUseDevChannelAPIs(
    239           NULL, GURL()))
    240     base_permissions |= ppapi::PERMISSION_DEV_CHANNEL;
    241   permissions_ = ppapi::PpapiPermissions::GetForCommandLine(base_permissions);
    242 
    243   process_.reset(new BrowserChildProcessHostImpl(
    244       PROCESS_TYPE_PPAPI_PLUGIN, this));
    245 
    246   host_impl_.reset(new BrowserPpapiHostImpl(this, permissions_, info.name,
    247                                             info.path, profile_data_directory,
    248                                             false /* in_process */,
    249                                             false /* external_plugin */));
    250 
    251   filter_ = new PepperMessageFilter();
    252   process_->AddFilter(filter_.get());
    253   process_->GetHost()->AddFilter(host_impl_->message_filter().get());
    254 
    255   GetContentClient()->browser()->DidCreatePpapiPlugin(host_impl_.get());
    256 
    257   // Only request network status updates if the plugin has dev permissions.
    258   if (permissions_.HasPermission(ppapi::PERMISSION_DEV))
    259     network_observer_.reset(new PluginNetworkObserver(this));
    260 }
    261 
    262 PpapiPluginProcessHost::PpapiPluginProcessHost()
    263     : is_broker_(true) {
    264   process_.reset(new BrowserChildProcessHostImpl(
    265       PROCESS_TYPE_PPAPI_BROKER, this));
    266 
    267   ppapi::PpapiPermissions permissions;  // No permissions.
    268   // The plugin name, path and profile data directory shouldn't be needed for
    269   // the broker.
    270   host_impl_.reset(new BrowserPpapiHostImpl(this, permissions,
    271                                             std::string(), base::FilePath(),
    272                                             base::FilePath(),
    273                                             false /* in_process */,
    274                                             false /* external_plugin */));
    275 }
    276 
    277 bool PpapiPluginProcessHost::Init(const PepperPluginInfo& info) {
    278   plugin_path_ = info.path;
    279   if (info.name.empty()) {
    280     process_->SetName(plugin_path_.BaseName().LossyDisplayName());
    281   } else {
    282     process_->SetName(base::UTF8ToUTF16(info.name));
    283   }
    284 
    285   std::string channel_id = process_->GetHost()->CreateChannel();
    286   if (channel_id.empty()) {
    287     VLOG(1) << "Could not create pepper host channel.";
    288     return false;
    289   }
    290 
    291   const CommandLine& browser_command_line = *CommandLine::ForCurrentProcess();
    292   CommandLine::StringType plugin_launcher =
    293       browser_command_line.GetSwitchValueNative(switches::kPpapiPluginLauncher);
    294 
    295 #if defined(OS_LINUX)
    296   int flags = plugin_launcher.empty() ? ChildProcessHost::CHILD_ALLOW_SELF :
    297                                         ChildProcessHost::CHILD_NORMAL;
    298 #else
    299   int flags = ChildProcessHost::CHILD_NORMAL;
    300 #endif
    301   base::FilePath exe_path = ChildProcessHost::GetChildPath(flags);
    302   if (exe_path.empty()) {
    303     VLOG(1) << "Pepper plugin exe path is empty.";
    304     return false;
    305   }
    306 
    307   CommandLine* cmd_line = new CommandLine(exe_path);
    308   cmd_line->AppendSwitchASCII(switches::kProcessType,
    309                               is_broker_ ? switches::kPpapiBrokerProcess
    310                                          : switches::kPpapiPluginProcess);
    311   cmd_line->AppendSwitchASCII(switches::kProcessChannelID, channel_id);
    312 
    313   // These switches are forwarded to both plugin and broker pocesses.
    314   static const char* kCommonForwardSwitches[] = {
    315     switches::kVModule
    316   };
    317   cmd_line->CopySwitchesFrom(browser_command_line, kCommonForwardSwitches,
    318                              arraysize(kCommonForwardSwitches));
    319 
    320   if (!is_broker_) {
    321     static const char* kPluginForwardSwitches[] = {
    322       switches::kDisableSeccompFilterSandbox,
    323 #if defined(OS_MACOSX)
    324       switches::kEnableSandboxLogging,
    325 #endif
    326       switches::kNoSandbox,
    327       switches::kPpapiStartupDialog,
    328     };
    329     cmd_line->CopySwitchesFrom(browser_command_line, kPluginForwardSwitches,
    330                                arraysize(kPluginForwardSwitches));
    331 
    332     // Copy any flash args over and introduce field trials if necessary.
    333     // TODO(vtl): Stop passing flash args in the command line, or windows is
    334     // going to explode.
    335     std::string field_trial =
    336         base::FieldTrialList::FindFullName(kFlashHwVideoDecodeFieldTrialName);
    337     std::string existing_args =
    338         browser_command_line.GetSwitchValueASCII(switches::kPpapiFlashArgs);
    339     if (field_trial == kFlashHwVideoDecodeFieldTrialEnabledName) {
    340       // Arguments passed to Flash are comma delimited.
    341       if (!existing_args.empty())
    342         existing_args.append(",");
    343       existing_args.append("enable_hw_video_decode=1");
    344     }
    345     cmd_line->AppendSwitchASCII(switches::kPpapiFlashArgs, existing_args);
    346   }
    347 
    348   std::string locale = GetContentClient()->browser()->GetApplicationLocale();
    349   if (!locale.empty()) {
    350     // Pass on the locale so the plugin will know what language we're using.
    351     cmd_line->AppendSwitchASCII(switches::kLang, locale);
    352   }
    353 
    354   if (!plugin_launcher.empty())
    355     cmd_line->PrependWrapper(plugin_launcher);
    356 
    357   // On posix, never use the zygote for the broker. Also, only use the zygote if
    358   // the plugin is sandboxed, and we are not using a plugin launcher - having a
    359   // plugin launcher means we need to use another process instead of just
    360   // forking the zygote.
    361 #if defined(OS_POSIX)
    362   if (!info.is_sandboxed)
    363     cmd_line->AppendSwitchASCII(switches::kNoSandbox, std::string());
    364 #endif  // OS_POSIX
    365   process_->Launch(
    366       new PpapiPluginSandboxedProcessLauncherDelegate(is_broker_,
    367                                                       info,
    368                                                       process_->GetHost()),
    369       cmd_line);
    370   return true;
    371 }
    372 
    373 void PpapiPluginProcessHost::RequestPluginChannel(Client* client) {
    374   base::ProcessHandle process_handle;
    375   int renderer_child_id;
    376   client->GetPpapiChannelInfo(&process_handle, &renderer_child_id);
    377 
    378   base::ProcessId process_id = (process_handle == base::kNullProcessHandle) ?
    379       0 : base::GetProcId(process_handle);
    380 
    381   // We can't send any sync messages from the browser because it might lead to
    382   // a hang. See the similar code in PluginProcessHost for more description.
    383   PpapiMsg_CreateChannel* msg = new PpapiMsg_CreateChannel(
    384       process_id, renderer_child_id, client->OffTheRecord());
    385   msg->set_unblock(true);
    386   if (Send(msg)) {
    387     sent_requests_.push(client);
    388   } else {
    389     client->OnPpapiChannelOpened(IPC::ChannelHandle(), base::kNullProcessId, 0);
    390   }
    391 }
    392 
    393 void PpapiPluginProcessHost::OnProcessLaunched() {
    394   VLOG(2) << "ppapi plugin process launched.";
    395   host_impl_->set_plugin_process_handle(process_->GetHandle());
    396 }
    397 
    398 void PpapiPluginProcessHost::OnProcessCrashed(int exit_code) {
    399   VLOG(1) << "ppapi plugin process crashed.";
    400   PluginServiceImpl::GetInstance()->RegisterPluginCrash(plugin_path_);
    401 }
    402 
    403 bool PpapiPluginProcessHost::OnMessageReceived(const IPC::Message& msg) {
    404   bool handled = true;
    405   IPC_BEGIN_MESSAGE_MAP(PpapiPluginProcessHost, msg)
    406     IPC_MESSAGE_HANDLER(PpapiHostMsg_ChannelCreated,
    407                         OnRendererPluginChannelCreated)
    408     IPC_MESSAGE_UNHANDLED(handled = false)
    409   IPC_END_MESSAGE_MAP()
    410   DCHECK(handled);
    411   return handled;
    412 }
    413 
    414 // Called when the browser <--> plugin channel has been established.
    415 void PpapiPluginProcessHost::OnChannelConnected(int32 peer_pid) {
    416   // This will actually load the plugin. Errors will actually not be reported
    417   // back at this point. Instead, the plugin will fail to establish the
    418   // connections when we request them on behalf of the renderer(s).
    419   Send(new PpapiMsg_LoadPlugin(plugin_path_, permissions_));
    420 
    421   // Process all pending channel requests from the renderers.
    422   for (size_t i = 0; i < pending_requests_.size(); i++)
    423     RequestPluginChannel(pending_requests_[i]);
    424   pending_requests_.clear();
    425 }
    426 
    427 // Called when the browser <--> plugin channel has an error. This normally
    428 // means the plugin has crashed.
    429 void PpapiPluginProcessHost::OnChannelError() {
    430   VLOG(1) << "PpapiPluginProcessHost" << (is_broker_ ? "[broker]" : "")
    431           << "::OnChannelError()";
    432   // We don't need to notify the renderers that were communicating with the
    433   // plugin since they have their own channels which will go into the error
    434   // state at the same time. Instead, we just need to notify any renderers
    435   // that have requested a connection but have not yet received one.
    436   CancelRequests();
    437 }
    438 
    439 void PpapiPluginProcessHost::CancelRequests() {
    440   DVLOG(1) << "PpapiPluginProcessHost" << (is_broker_ ? "[broker]" : "")
    441            << "CancelRequests()";
    442   for (size_t i = 0; i < pending_requests_.size(); i++) {
    443     pending_requests_[i]->OnPpapiChannelOpened(IPC::ChannelHandle(),
    444                                                base::kNullProcessId, 0);
    445   }
    446   pending_requests_.clear();
    447 
    448   while (!sent_requests_.empty()) {
    449     sent_requests_.front()->OnPpapiChannelOpened(IPC::ChannelHandle(),
    450                                                  base::kNullProcessId, 0);
    451     sent_requests_.pop();
    452   }
    453 }
    454 
    455 // Called when a new plugin <--> renderer channel has been created.
    456 void PpapiPluginProcessHost::OnRendererPluginChannelCreated(
    457     const IPC::ChannelHandle& channel_handle) {
    458   if (sent_requests_.empty())
    459     return;
    460 
    461   // All requests should be processed FIFO, so the next item in the
    462   // sent_requests_ queue should be the one that the plugin just created.
    463   Client* client = sent_requests_.front();
    464   sent_requests_.pop();
    465 
    466   const ChildProcessData& data = process_->GetData();
    467   client->OnPpapiChannelOpened(channel_handle, base::GetProcId(data.handle),
    468                                data.id);
    469 }
    470 
    471 }  // namespace content
    472