content/common/plugin_list.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/common/plugin_list.h"
   6
   7 #include <algorithm>
   8
   9 #include "base/command_line.h"
  10 #include "base/lazy_instance.h"
  11 #include "base/logging.h"
  12 #include "base/strings/string_split.h"
  13 #include "base/strings/string_util.h"
  14 #include "base/strings/sys_string_conversions.h"
  15 #include "base/strings/utf_string_conversions.h"
  16 #include "content/public/common/content_switches.h"
  17 #include "net/base/mime_util.h"
  18 #include "url/gurl.h"
  19
  20 #if defined(OS_WIN)
  21 #include "content/common/plugin_constants_win.h"
  22 #endif
  23
  24 namespace content {
  25
  26 namespace {
  27
  28 base::LazyInstance<PluginList> g_singleton = LAZY_INSTANCE_INITIALIZER;
  29
  30 }  // namespace
  31
  32 // static
  33 PluginList* PluginList::Singleton() {
  34   return g_singleton.Pointer();
  35 }
  36
  37 // static
  38 bool PluginList::DebugPluginLoading() {
  39   return base::CommandLine::ForCurrentProcess()->HasSwitch(
  40       switches::kDebugPluginLoading);
  41 }
  42
  43 void PluginList::DisablePluginsDiscovery() {
  44   plugins_discovery_disabled_ = true;
  45 }
  46
  47 void PluginList::RefreshPlugins() {
  48   base::AutoLock lock(lock_);
  49   loading_state_ = LOADING_STATE_NEEDS_REFRESH;
  50 }
  51
  52 void PluginList::AddExtraPluginPath(const base::FilePath& plugin_path) {
  53   // Chrome OS only loads plugins from /opt/google/chrome/plugins.
  54 #if !defined(OS_CHROMEOS)
  55   base::AutoLock lock(lock_);
  56   extra_plugin_paths_.push_back(plugin_path);
  57 #endif
  58 }
  59
  60 void PluginList::RemoveExtraPluginPath(const base::FilePath& plugin_path) {
  61   base::AutoLock lock(lock_);
  62   RemoveExtraPluginPathLocked(plugin_path);
  63 }
  64
  65 void PluginList::AddExtraPluginDir(const base::FilePath& plugin_dir) {
  66   // Chrome OS only loads plugins from /opt/google/chrome/plugins.
  67 #if !defined(OS_CHROMEOS)
  68   base::AutoLock lock(lock_);
  69   extra_plugin_dirs_.push_back(plugin_dir);
  70 #endif
  71 }
  72
  73 void PluginList::RegisterInternalPlugin(const WebPluginInfo& info,
  74                                         bool add_at_beginning) {
  75   base::AutoLock lock(lock_);
  76
  77   internal_plugins_.push_back(info);
  78   if (add_at_beginning) {
  79     // Newer registrations go earlier in the list so they can override the MIME
  80     // types of older registrations.
  81     extra_plugin_paths_.insert(extra_plugin_paths_.begin(), info.path);
  82   } else {
  83     extra_plugin_paths_.push_back(info.path);
  84   }
  85 }
  86
  87 void PluginList::UnregisterInternalPlugin(const base::FilePath& path) {
  88   base::AutoLock lock(lock_);
  89   bool found = false;
  90   for (size_t i = 0; i < internal_plugins_.size(); i++) {
  91     if (internal_plugins_[i].path == path) {
  92       internal_plugins_.erase(internal_plugins_.begin() + i);
  93       found = true;
  94       break;
  95     }
  96   }
  97   DCHECK(found);
  98   RemoveExtraPluginPathLocked(path);
  99 }
 100
 101 void PluginList::GetInternalPlugins(
 102     std::vector<WebPluginInfo>* internal_plugins) {
 103   base::AutoLock lock(lock_);
 104
 105   for (std::vector<WebPluginInfo>::iterator it = internal_plugins_.begin();
 106        it != internal_plugins_.end();
 107        ++it) {
 108     internal_plugins->push_back(*it);
 109   }
 110 }
 111
 112 bool PluginList::ReadPluginInfo(const base::FilePath& filename,
 113                                 WebPluginInfo* info) {
 114   {
 115     base::AutoLock lock(lock_);
 116     for (size_t i = 0; i < internal_plugins_.size(); ++i) {
 117       if (filename == internal_plugins_[i].path) {
 118         *info = internal_plugins_[i];
 119         return true;
 120       }
 121     }
 122   }
 123
 124   return PluginList::ReadWebPluginInfo(filename, info);
 125 }
 126
 127 // static
 128 bool PluginList::ParseMimeTypes(
 129     const std::string& mime_types_str,
 130     const std::string& file_extensions_str,
 131     const base::string16& mime_type_descriptions_str,
 132     std::vector<WebPluginMimeType>* parsed_mime_types) {
 133   std::vector<std::string> mime_types, file_extensions;
 134   std::vector<base::string16> descriptions;
 135   base::SplitString(mime_types_str, '|', &mime_types);
 136   base::SplitString(file_extensions_str, '|', &file_extensions);
 137   base::SplitString(mime_type_descriptions_str, '|', &descriptions);
 138
 139   parsed_mime_types->clear();
 140
 141   if (mime_types.empty())
 142     return false;
 143
 144   for (size_t i = 0; i < mime_types.size(); ++i) {
 145     WebPluginMimeType mime_type;
 146     mime_type.mime_type = base::StringToLowerASCII(mime_types[i]);
 147     if (file_extensions.size() > i)
 148       base::SplitString(file_extensions[i], ',', &mime_type.file_extensions);
 149
 150     if (descriptions.size() > i) {
 151       mime_type.description = descriptions[i];
 152
 153       // On Windows, the description likely has a list of file extensions
 154       // embedded in it (e.g. "SurfWriter file (*.swr)"). Remove an extension
 155       // list from the description if it is present.
 156       size_t ext = mime_type.description.find(base::ASCIIToUTF16("(*"));
 157       if (ext != base::string16::npos) {
 158         if (ext > 1 && mime_type.description[ext - 1] == ' ')
 159           ext--;
 160
 161         mime_type.description.erase(ext);
 162       }
 163     }
 164
 165     parsed_mime_types->push_back(mime_type);
 166   }
 167
 168   return true;
 169 }
 170
 171 PluginList::PluginList()
 172     : loading_state_(LOADING_STATE_NEEDS_REFRESH),
 173       plugins_discovery_disabled_(false) {
 174 }
 175
 176 bool PluginList::PrepareForPluginLoading() {
 177   base::AutoLock lock(lock_);
 178   if (loading_state_ == LOADING_STATE_UP_TO_DATE)
 179     return false;
 180
 181   loading_state_ = LOADING_STATE_REFRESHING;
 182   return true;
 183 }
 184
 185 void PluginList::LoadPlugins(bool include_npapi) {
 186   if (!PrepareForPluginLoading())
 187     return;
 188
 189   std::vector<WebPluginInfo> new_plugins;
 190   base::Closure will_load_callback;
 191   {
 192     base::AutoLock lock(lock_);
 193     will_load_callback = will_load_plugins_callback_;
 194   }
 195   if (!will_load_callback.is_null())
 196     will_load_callback.Run();
 197
 198   std::vector<base::FilePath> plugin_paths;
 199   GetPluginPathsToLoad(&plugin_paths, include_npapi);
 200
 201   for (std::vector<base::FilePath>::const_iterator it = plugin_paths.begin();
 202        it != plugin_paths.end();
 203        ++it) {
 204     WebPluginInfo plugin_info;
 205     LoadPluginIntoPluginList(*it, &new_plugins, &plugin_info);
 206   }
 207
 208   SetPlugins(new_plugins);
 209 }
 210
 211 bool PluginList::LoadPluginIntoPluginList(
 212     const base::FilePath& path,
 213     std::vector<WebPluginInfo>* plugins,
 214     WebPluginInfo* plugin_info) {
 215   LOG_IF(ERROR, PluginList::DebugPluginLoading())
 216       << "Loading plugin " << path.value();
 217   if (!ReadPluginInfo(path, plugin_info))
 218     return false;
 219
 220   if (!ShouldLoadPluginUsingPluginList(*plugin_info, plugins))
 221     return false;
 222
 223 #if defined(OS_WIN) && !defined(NDEBUG)
 224   if (path.BaseName().value() != L"npspy.dll")  // Make an exception for NPSPY
 225 #endif
 226   {
 227     for (size_t i = 0; i < plugin_info->mime_types.size(); ++i) {
 228       // TODO: don't load global handlers for now.
 229       // WebKit hands to the Plugin before it tries
 230       // to handle mimeTypes on its own.
 231       const std::string &mime_type = plugin_info->mime_types[i].mime_type;
 232       if (mime_type == "*")
 233         return false;
 234     }
 235   }
 236   plugins->push_back(*plugin_info);
 237   return true;
 238 }
 239
 240 void PluginList::GetPluginPathsToLoad(std::vector<base::FilePath>* plugin_paths,
 241                                       bool include_npapi) {
 242   // Don't want to hold the lock while loading new plugins, so we don't block
 243   // other methods if they're called on other threads.
 244   std::vector<base::FilePath> extra_plugin_paths;
 245   std::vector<base::FilePath> extra_plugin_dirs;
 246   {
 247     base::AutoLock lock(lock_);
 248     extra_plugin_paths = extra_plugin_paths_;
 249     extra_plugin_dirs = extra_plugin_dirs_;
 250   }
 251
 252   for (size_t i = 0; i < extra_plugin_paths.size(); ++i) {
 253     const base::FilePath& path = extra_plugin_paths[i];
 254     if (std::find(plugin_paths->begin(), plugin_paths->end(), path) !=
 255         plugin_paths->end()) {
 256       continue;
 257     }
 258     plugin_paths->push_back(path);
 259   }
 260
 261   if (include_npapi) {
 262     // A bit confusingly, this function is used to load Pepper plugins as well.
 263     // Those are all internal plugins so we have to use extra_plugin_paths.
 264     for (size_t i = 0; i < extra_plugin_dirs.size(); ++i)
 265       GetPluginsInDir(extra_plugin_dirs[i], plugin_paths);
 266
 267     std::vector<base::FilePath> directories_to_scan;
 268     GetPluginDirectories(&directories_to_scan);
 269     for (size_t i = 0; i < directories_to_scan.size(); ++i)
 270       GetPluginsInDir(directories_to_scan[i], plugin_paths);
 271
 272 #if defined(OS_WIN)
 273     GetPluginPathsFromRegistry(plugin_paths);
 274 #endif
 275   }
 276 }
 277
 278 void PluginList::SetPlugins(const std::vector<WebPluginInfo>& plugins) {
 279   base::AutoLock lock(lock_);
 280
 281   // If we haven't been invalidated in the mean time, mark the plugin list as
 282   // up-to-date.
 283   if (loading_state_ != LOADING_STATE_NEEDS_REFRESH)
 284     loading_state_ = LOADING_STATE_UP_TO_DATE;
 285
 286   plugins_list_ = plugins;
 287 }
 288
 289 void PluginList::set_will_load_plugins_callback(const base::Closure& callback) {
 290   base::AutoLock lock(lock_);
 291   will_load_plugins_callback_ = callback;
 292 }
 293
 294 void PluginList::GetPlugins(std::vector<WebPluginInfo>* plugins,
 295                             bool include_npapi) {
 296   LoadPlugins(include_npapi);
 297   base::AutoLock lock(lock_);
 298   plugins->insert(plugins->end(), plugins_list_.begin(), plugins_list_.end());
 299 }
 300
 301 bool PluginList::GetPluginsNoRefresh(std::vector<WebPluginInfo>* plugins) {
 302   base::AutoLock lock(lock_);
 303   plugins->insert(plugins->end(), plugins_list_.begin(), plugins_list_.end());
 304
 305   return loading_state_ == LOADING_STATE_UP_TO_DATE;
 306 }
 307
 308 void PluginList::GetPluginInfoArray(
 309     const GURL& url,
 310     const std::string& mime_type,
 311     bool allow_wildcard,
 312     bool* use_stale,
 313     bool include_npapi,
 314     std::vector<WebPluginInfo>* info,
 315     std::vector<std::string>* actual_mime_types) {
 316   DCHECK(mime_type == base::StringToLowerASCII(mime_type));
 317   DCHECK(info);
 318
 319   if (!use_stale)
 320     LoadPlugins(include_npapi);
 321   base::AutoLock lock(lock_);
 322   if (use_stale)
 323     *use_stale = (loading_state_ != LOADING_STATE_UP_TO_DATE);
 324   info->clear();
 325   if (actual_mime_types)
 326     actual_mime_types->clear();
 327
 328   std::set<base::FilePath> visited_plugins;
 329
 330   // Add in plugins by mime type.
 331   for (size_t i = 0; i < plugins_list_.size(); ++i) {
 332     if (SupportsType(plugins_list_[i], mime_type, allow_wildcard)) {
 333       base::FilePath path = plugins_list_[i].path;
 334       if (visited_plugins.insert(path).second) {
 335         info->push_back(plugins_list_[i]);
 336         if (actual_mime_types)
 337           actual_mime_types->push_back(mime_type);
 338       }
 339     }
 340   }
 341
 342   // Add in plugins by url.
 343   // We do not permit URL-sniff based plugin MIME type overrides aside from
 344   // the case where the "type" was initially missing.
 345   // We collected stats to determine this approach isn't a major compat issue,
 346   // and we defend against content confusion attacks in various cases, such
 347   // as when the user doesn't have the Flash plugin enabled.
 348   std::string path = url.path();
 349   std::string::size_type last_dot = path.rfind('.');
 350   if (last_dot != std::string::npos && mime_type.empty()) {
 351     std::string extension =
 352         base::StringToLowerASCII(std::string(path, last_dot+1));
 353     std::string actual_mime_type;
 354     for (size_t i = 0; i < plugins_list_.size(); ++i) {
 355       if (SupportsExtension(plugins_list_[i], extension, &actual_mime_type)) {
 356         base::FilePath path = plugins_list_[i].path;
 357         if (visited_plugins.insert(path).second) {
 358           info->push_back(plugins_list_[i]);
 359           if (actual_mime_types)
 360             actual_mime_types->push_back(actual_mime_type);
 361         }
 362       }
 363     }
 364   }
 365 }
 366
 367 bool PluginList::SupportsType(const WebPluginInfo& plugin,
 368                               const std::string& mime_type,
 369                               bool allow_wildcard) {
 370   // Webkit will ask for a plugin to handle empty mime types.
 371   if (mime_type.empty())
 372     return false;
 373
 374   for (size_t i = 0; i < plugin.mime_types.size(); ++i) {
 375     const WebPluginMimeType& mime_info = plugin.mime_types[i];
 376     if (net::MatchesMimeType(mime_info.mime_type, mime_type)) {
 377       if (!allow_wildcard && mime_info.mime_type == "*")
 378         continue;
 379       return true;
 380     }
 381   }
 382   return false;
 383 }
 384
 385 bool PluginList::SupportsExtension(const WebPluginInfo& plugin,
 386                                    const std::string& extension,
 387                                    std::string* actual_mime_type) {
 388   for (size_t i = 0; i < plugin.mime_types.size(); ++i) {
 389     const WebPluginMimeType& mime_type = plugin.mime_types[i];
 390     for (size_t j = 0; j < mime_type.file_extensions.size(); ++j) {
 391       if (mime_type.file_extensions[j] == extension) {
 392         if (actual_mime_type)
 393           *actual_mime_type = mime_type.mime_type;
 394         return true;
 395       }
 396     }
 397   }
 398   return false;
 399 }
 400
 401 void PluginList::RemoveExtraPluginPathLocked(
 402     const base::FilePath& plugin_path) {
 403   lock_.AssertAcquired();
 404   std::vector<base::FilePath>::iterator it =
 405       std::find(extra_plugin_paths_.begin(), extra_plugin_paths_.end(),
 406                 plugin_path);
 407   if (it != extra_plugin_paths_.end())
 408     extra_plugin_paths_.erase(it);
 409 }
 410
 411 PluginList::~PluginList() {
 412 }
 413
 414
 415 }  // namespace content