chrome/browser/nacl_host/nacl_browser_delegate_impl.cc

   1 // Copyright 2013 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 "chrome/browser/nacl_host/nacl_browser_delegate_impl.h"
   6
   7 #include "base/path_service.h"
   8 #include "base/strings/string_split.h"
   9 #include "base/strings/string_util.h"
  10 #include "chrome/browser/browser_process.h"
  11 #include "chrome/browser/component_updater/pnacl/pnacl_component_installer.h"
  12 #include "chrome/browser/extensions/extension_service.h"
  13 #include "chrome/browser/nacl_host/nacl_infobar_delegate.h"
  14 #include "chrome/browser/profiles/profile.h"
  15 #include "chrome/browser/renderer_host/pepper/chrome_browser_pepper_host_factory.h"
  16 #include "chrome/common/chrome_paths.h"
  17 #include "chrome/common/chrome_paths_internal.h"
  18 #include "chrome/common/chrome_version_info.h"
  19 #include "chrome/common/logging_chrome.h"
  20 #include "content/public/browser/browser_thread.h"
  21 #include "content/public/browser/render_frame_host.h"
  22 #include "content/public/browser/site_instance.h"
  23 #include "extensions/browser/extension_system.h"
  24 #include "extensions/browser/info_map.h"
  25 #include "extensions/browser/process_manager.h"
  26 #include "extensions/common/constants.h"
  27 #include "extensions/common/extension.h"
  28 #include "extensions/common/manifest_handlers/shared_module_info.h"
  29 #include "extensions/common/url_pattern.h"
  30 #include "ppapi/c/private/ppb_nacl_private.h"
  31
  32 using extensions::SharedModuleInfo;
  33
  34 namespace {
  35
  36 // Handles an extension's NaCl process transitioning in or out of idle state by
  37 // relaying the state to the extension's process manager.
  38 //
  39 // A NaCl instance, when active (making PPAPI calls or receiving callbacks),
  40 // sends keepalive IPCs to the browser process BrowserPpapiHost at a throttled
  41 // rate. The content::BrowserPpapiHost passes context information up to the
  42 // chrome level NaClProcessHost where we use the instance's context to find the
  43 // associated extension process manager.
  44 //
  45 // There is a 1:many relationship for extension:nacl-embeds, but only a
  46 // 1:1 relationship for NaClProcessHost:PP_Instance. The content layer doesn't
  47 // rely on this knowledge because it routes messages for ppapi non-nacl
  48 // instances as well, though they won't have callbacks set. Here the 1:1
  49 // assumption is made and DCHECKed.
  50 void OnKeepaliveOnUIThread(
  51     const content::BrowserPpapiHost::OnKeepaliveInstanceData& instance_data,
  52     const base::FilePath& profile_data_directory) {
  53   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
  54
  55   // Only one instance will exist for NaCl embeds, even when more than one
  56   // embed of the same plugin exists on the same page.
  57   DCHECK(instance_data.size() == 1);
  58   if (instance_data.size() < 1)
  59     return;
  60
  61   content::RenderFrameHost* render_frame_host =
  62       content::RenderFrameHost::FromID(
  63           instance_data[0].render_process_id, instance_data[0].render_frame_id);
  64   if (!render_frame_host)
  65     return;
  66
  67   content::SiteInstance* site_instance = render_frame_host->GetSiteInstance();
  68   if (!site_instance)
  69     return;
  70
  71   extensions::ExtensionSystem* extension_system =
  72       extensions::ExtensionSystem::Get(site_instance->GetBrowserContext());
  73   if (!extension_system)
  74     return;
  75
  76   const ExtensionService* extension_service =
  77       extension_system->extension_service();
  78   if (!extension_service)
  79     return;
  80
  81   const extensions::Extension* extension = extension_service->GetExtensionById(
  82       instance_data[0].document_url.host(), false);
  83   if (!extension)
  84     return;
  85
  86   extensions::ProcessManager* pm = extension_system->process_manager();
  87   if (!pm)
  88     return;
  89
  90   pm->KeepaliveImpulse(extension);
  91 }
  92
  93 // Calls OnKeepaliveOnUIThread on UI thread.
  94 void OnKeepalive(
  95     const content::BrowserPpapiHost::OnKeepaliveInstanceData& instance_data,
  96     const base::FilePath& profile_data_directory) {
  97   DCHECK(!content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
  98   content::BrowserThread::PostTask(content::BrowserThread::UI, FROM_HERE,
  99                                    base::Bind(&OnKeepaliveOnUIThread,
 100                                               instance_data,
 101                                               profile_data_directory));
 102 }
 103
 104 }  // namespace
 105
 106 NaClBrowserDelegateImpl::NaClBrowserDelegateImpl(
 107     extensions::InfoMap* extension_info_map)
 108     : extension_info_map_(extension_info_map), inverse_debug_patterns_(false) {}
 109
 110 NaClBrowserDelegateImpl::~NaClBrowserDelegateImpl() {
 111 }
 112
 113 void NaClBrowserDelegateImpl::ShowMissingArchInfobar(int render_process_id,
 114                                                      int render_view_id) {
 115   content::BrowserThread::PostTask(
 116       content::BrowserThread::UI, FROM_HERE,
 117       base::Bind(&NaClInfoBarDelegate::Create, render_process_id,
 118                  render_view_id));
 119 }
 120
 121 bool NaClBrowserDelegateImpl::DialogsAreSuppressed() {
 122   return logging::DialogsAreSuppressed();
 123 }
 124
 125 bool NaClBrowserDelegateImpl::GetCacheDirectory(base::FilePath* cache_dir) {
 126   base::FilePath user_data_dir;
 127   if (!PathService::Get(chrome::DIR_USER_DATA, &user_data_dir))
 128     return false;
 129   chrome::GetUserCacheDirectory(user_data_dir, cache_dir);
 130   return true;
 131 }
 132
 133 bool NaClBrowserDelegateImpl::GetPluginDirectory(base::FilePath* plugin_dir) {
 134   return PathService::Get(chrome::DIR_INTERNAL_PLUGINS, plugin_dir);
 135 }
 136
 137 bool NaClBrowserDelegateImpl::GetPnaclDirectory(base::FilePath* pnacl_dir) {
 138   return PathService::Get(chrome::DIR_PNACL_COMPONENT, pnacl_dir);
 139 }
 140
 141 bool NaClBrowserDelegateImpl::GetUserDirectory(base::FilePath* user_dir) {
 142   return PathService::Get(chrome::DIR_USER_DATA, user_dir);
 143 }
 144
 145 std::string NaClBrowserDelegateImpl::GetVersionString() const {
 146   return chrome::VersionInfo().CreateVersionString();
 147 }
 148
 149 ppapi::host::HostFactory* NaClBrowserDelegateImpl::CreatePpapiHostFactory(
 150     content::BrowserPpapiHost* ppapi_host) {
 151   return new chrome::ChromeBrowserPepperHostFactory(ppapi_host);
 152 }
 153
 154 void NaClBrowserDelegateImpl::SetDebugPatterns(std::string debug_patterns) {
 155   if (!debug_patterns.empty() && debug_patterns[0] == '!') {
 156     inverse_debug_patterns_ = true;
 157     debug_patterns.erase(0, 1);
 158   }
 159   if (debug_patterns.empty()) {
 160     return;
 161   }
 162   std::vector<std::string> patterns;
 163   base::SplitString(debug_patterns, ',', &patterns);
 164   for (std::vector<std::string>::iterator iter = patterns.begin();
 165        iter != patterns.end(); ++iter) {
 166     // Allow chrome:// schema, which is used to filter out the internal
 167     // PNaCl translator. Also allow chrome-extension:// schema (which
 168     // can have NaCl modules). The default is to disallow these schema
 169     // since they can be dangerous in the context of chrome extension
 170     // permissions, but they are okay here, for NaCl GDB avoidance.
 171     URLPattern pattern(URLPattern::SCHEME_ALL);
 172     if (pattern.Parse(*iter) == URLPattern::PARSE_SUCCESS) {
 173       // If URL pattern has scheme equal to *, Parse method resets valid
 174       // schemes mask to http and https only, so we need to reset it after
 175       // Parse to re-include chrome-extension and chrome schema.
 176       pattern.SetValidSchemes(URLPattern::SCHEME_ALL);
 177       debug_patterns_.push_back(pattern);
 178     }
 179   }
 180 }
 181
 182 bool NaClBrowserDelegateImpl::URLMatchesDebugPatterns(
 183     const GURL& manifest_url) {
 184   // Empty patterns are forbidden so we ignore them.
 185   if (debug_patterns_.empty()) {
 186     return true;
 187   }
 188   bool matches = false;
 189   for (std::vector<URLPattern>::iterator iter = debug_patterns_.begin();
 190        iter != debug_patterns_.end(); ++iter) {
 191     if (iter->MatchesURL(manifest_url)) {
 192       matches = true;
 193       break;
 194     }
 195   }
 196   if (inverse_debug_patterns_) {
 197     return !matches;
 198   } else {
 199     return matches;
 200   }
 201 }
 202
 203 // This function is security sensitive.  Be sure to check with a security
 204 // person before you modify it.
 205 bool NaClBrowserDelegateImpl::MapUrlToLocalFilePath(
 206     const GURL& file_url, bool use_blocking_api, base::FilePath* file_path) {
 207   DCHECK(extension_info_map_);
 208   // Check that the URL is recognized by the extension system.
 209   const extensions::Extension* extension =
 210       extension_info_map_->extensions().GetExtensionOrAppByURL(file_url);
 211   if (!extension)
 212     return false;
 213
 214   // This is a short-cut which avoids calling a blocking file operation
 215   // (GetFilePath()), so that this can be called on the IO thread. It only
 216   // handles a subset of the urls.
 217   if (!use_blocking_api) {
 218     if (file_url.SchemeIs(extensions::kExtensionScheme)) {
 219       std::string path = file_url.path();
 220       base::TrimString(path, "/", &path);  // Remove first slash
 221       *file_path = extension->path().AppendASCII(path);
 222       return true;
 223     }
 224     return false;
 225   }
 226
 227   std::string path = file_url.path();
 228   extensions::ExtensionResource resource;
 229
 230   if (SharedModuleInfo::IsImportedPath(path)) {
 231     // Check if this is a valid path that is imported for this extension.
 232     std::string new_extension_id;
 233     std::string new_relative_path;
 234     SharedModuleInfo::ParseImportedPath(path, &new_extension_id,
 235                                         &new_relative_path);
 236     const extensions::Extension* new_extension =
 237         extension_info_map_->extensions().GetByID(new_extension_id);
 238     if (!new_extension)
 239       return false;
 240
 241     if (!SharedModuleInfo::ImportsExtensionById(extension, new_extension_id) ||
 242         !SharedModuleInfo::IsExportAllowed(new_extension, new_relative_path)) {
 243       return false;
 244     }
 245
 246     resource = new_extension->GetResource(new_relative_path);
 247   } else {
 248     // Check that the URL references a resource in the extension.
 249     resource = extension->GetResource(path);
 250   }
 251
 252   if (resource.empty())
 253     return false;
 254
 255   // GetFilePath is a blocking function call.
 256   const base::FilePath resource_file_path = resource.GetFilePath();
 257   if (resource_file_path.empty())
 258     return false;
 259
 260   *file_path = resource_file_path;
 261   return true;
 262 }
 263
 264 content::BrowserPpapiHost::OnKeepaliveCallback
 265 NaClBrowserDelegateImpl::GetOnKeepaliveCallback() {
 266   return base::Bind(&OnKeepalive);
 267 }