src/chrome/browser/renderer_host/pepper/pepper_isolated_file_system_message_filter.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/renderer_host/pepper/pepper_isolated_file_system_message_filter.h"
   6
   7 #include "chrome/browser/browser_process.h"
   8 #include "chrome/browser/extensions/extension_service.h"
   9 #include "chrome/browser/profiles/profile.h"
  10 #include "chrome/browser/profiles/profile_manager.h"
  11 #include "chrome/common/chrome_switches.h"
  12 #include "chrome/common/pepper_permission_util.h"
  13 #include "content/public/browser/browser_ppapi_host.h"
  14 #include "content/public/browser/browser_thread.h"
  15 #include "content/public/browser/child_process_security_policy.h"
  16 #include "content/public/browser/render_view_host.h"
  17 #include "extensions/browser/extension_system.h"
  18 #include "extensions/common/constants.h"
  19 #include "extensions/common/extension.h"
  20 #include "extensions/common/extension_set.h"
  21 #include "ppapi/c/pp_errors.h"
  22 #include "ppapi/host/dispatch_host_message.h"
  23 #include "ppapi/host/host_message_context.h"
  24 #include "ppapi/host/ppapi_host.h"
  25 #include "ppapi/proxy/ppapi_messages.h"
  26 #include "ppapi/shared_impl/file_system_util.h"
  27 #include "webkit/browser/fileapi/isolated_context.h"
  28
  29 namespace chrome {
  30
  31 namespace {
  32
  33 const char* kPredefinedAllowedCrxFsOrigins[] = {
  34     "6EAED1924DB611B6EEF2A664BD077BE7EAD33B8F",  // see crbug.com/234789
  35     "4EB74897CB187C7633357C2FE832E0AD6A44883A"   // see crbug.com/234789
  36 };
  37
  38 }  // namespace
  39
  40 // static
  41 PepperIsolatedFileSystemMessageFilter*
  42 PepperIsolatedFileSystemMessageFilter::Create(PP_Instance instance,
  43                                               content::BrowserPpapiHost* host) {
  44   int render_process_id;
  45   int unused_render_frame_id;
  46   if (!host->GetRenderFrameIDsForInstance(
  47           instance, &render_process_id, &unused_render_frame_id)) {
  48     return NULL;
  49   }
  50   return new PepperIsolatedFileSystemMessageFilter(
  51       render_process_id,
  52       host->GetProfileDataDirectory(),
  53       host->GetDocumentURLForInstance(instance),
  54       host->GetPpapiHost());
  55 }
  56
  57 PepperIsolatedFileSystemMessageFilter::PepperIsolatedFileSystemMessageFilter(
  58     int render_process_id,
  59     const base::FilePath& profile_directory,
  60     const GURL& document_url,
  61     ppapi::host::PpapiHost* ppapi_host)
  62     : render_process_id_(render_process_id),
  63       profile_directory_(profile_directory),
  64       document_url_(document_url),
  65       ppapi_host_(ppapi_host) {
  66   for (size_t i = 0; i < arraysize(kPredefinedAllowedCrxFsOrigins); ++i)
  67     allowed_crxfs_origins_.insert(kPredefinedAllowedCrxFsOrigins[i]);
  68 }
  69
  70 PepperIsolatedFileSystemMessageFilter::
  71     ~PepperIsolatedFileSystemMessageFilter() {}
  72
  73 scoped_refptr<base::TaskRunner>
  74 PepperIsolatedFileSystemMessageFilter::OverrideTaskRunnerForMessage(
  75     const IPC::Message& msg) {
  76   // In order to reach ExtensionSystem, we need to get ProfileManager first.
  77   // ProfileManager lives in UI thread, so we need to do this in UI thread.
  78   return content::BrowserThread::GetMessageLoopProxyForThread(
  79       content::BrowserThread::UI);
  80 }
  81
  82 int32_t PepperIsolatedFileSystemMessageFilter::OnResourceMessageReceived(
  83     const IPC::Message& msg,
  84     ppapi::host::HostMessageContext* context) {
  85   PPAPI_BEGIN_MESSAGE_MAP(PepperIsolatedFileSystemMessageFilter, msg)
  86     PPAPI_DISPATCH_HOST_RESOURCE_CALL(
  87       PpapiHostMsg_IsolatedFileSystem_BrowserOpen,
  88       OnOpenFileSystem)
  89   PPAPI_END_MESSAGE_MAP()
  90   return PP_ERROR_FAILED;
  91 }
  92
  93 Profile* PepperIsolatedFileSystemMessageFilter::GetProfile() {
  94   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
  95   ProfileManager* profile_manager = g_browser_process->profile_manager();
  96   return profile_manager->GetProfile(profile_directory_);
  97 }
  98
  99 std::string PepperIsolatedFileSystemMessageFilter::CreateCrxFileSystem(
 100     Profile* profile) {
 101   extensions::ExtensionSystem* extension_system =
 102       extensions::ExtensionSystem::Get(profile);
 103   if (!extension_system)
 104     return std::string();
 105
 106   const ExtensionService* extension_service =
 107       extension_system->extension_service();
 108   if (!extension_service)
 109     return std::string();
 110
 111   const extensions::Extension* extension =
 112       extension_service->GetExtensionById(document_url_.host(), false);
 113   if (!extension)
 114     return std::string();
 115
 116   // First level directory for isolated filesystem to lookup.
 117   std::string kFirstLevelDirectory("crxfs");
 118   return fileapi::IsolatedContext::GetInstance()->RegisterFileSystemForPath(
 119       fileapi::kFileSystemTypeNativeLocal,
 120       std::string(),
 121       extension->path(),
 122       &kFirstLevelDirectory);
 123 }
 124
 125 int32_t PepperIsolatedFileSystemMessageFilter::OnOpenFileSystem(
 126     ppapi::host::HostMessageContext* context,
 127     PP_IsolatedFileSystemType_Private type) {
 128   switch (type) {
 129     case PP_ISOLATEDFILESYSTEMTYPE_PRIVATE_INVALID:
 130       break;
 131     case PP_ISOLATEDFILESYSTEMTYPE_PRIVATE_CRX:
 132       return OpenCrxFileSystem(context);
 133     case PP_ISOLATEDFILESYSTEMTYPE_PRIVATE_PLUGINPRIVATE:
 134       return OpenPluginPrivateFileSystem(context);
 135   }
 136   NOTREACHED();
 137   context->reply_msg =
 138       PpapiPluginMsg_IsolatedFileSystem_BrowserOpenReply(std::string());
 139   return PP_ERROR_FAILED;
 140 }
 141
 142 int32_t PepperIsolatedFileSystemMessageFilter::OpenCrxFileSystem(
 143     ppapi::host::HostMessageContext* context) {
 144   Profile* profile = GetProfile();
 145   const extensions::ExtensionSet* extension_set = NULL;
 146   if (profile) {
 147     extension_set = extensions::ExtensionSystem::Get(profile)
 148                         ->extension_service()
 149                         ->extensions();
 150   }
 151   if (!IsExtensionOrSharedModuleWhitelisted(
 152           document_url_, extension_set, allowed_crxfs_origins_) &&
 153       !IsHostAllowedByCommandLine(
 154           document_url_, extension_set, switches::kAllowNaClCrxFsAPI)) {
 155     LOG(ERROR) << "Host " << document_url_.host() << " cannot use CrxFs API.";
 156     return PP_ERROR_NOACCESS;
 157   }
 158
 159   // TODO(raymes): When we remove FileSystem from the renderer, we should create
 160   // a pending PepperFileSystemBrowserHost here with the fsid and send the
 161   // pending host ID back to the plugin.
 162   const std::string fsid = CreateCrxFileSystem(profile);
 163   if (fsid.empty()) {
 164     context->reply_msg =
 165         PpapiPluginMsg_IsolatedFileSystem_BrowserOpenReply(std::string());
 166     return PP_ERROR_NOTSUPPORTED;
 167   }
 168
 169   // Grant readonly access of isolated filesystem to renderer process.
 170   content::ChildProcessSecurityPolicy* policy =
 171       content::ChildProcessSecurityPolicy::GetInstance();
 172   policy->GrantReadFileSystem(render_process_id_, fsid);
 173
 174   context->reply_msg = PpapiPluginMsg_IsolatedFileSystem_BrowserOpenReply(fsid);
 175   return PP_OK;
 176 }
 177
 178 int32_t PepperIsolatedFileSystemMessageFilter::OpenPluginPrivateFileSystem(
 179     ppapi::host::HostMessageContext* context) {
 180   DCHECK(ppapi_host_);
 181   // Only plugins with private permission can open the filesystem.
 182   if (!ppapi_host_->permissions().HasPermission(ppapi::PERMISSION_PRIVATE))
 183     return PP_ERROR_NOACCESS;
 184
 185   const std::string& root_name = ppapi::IsolatedFileSystemTypeToRootName(
 186       PP_ISOLATEDFILESYSTEMTYPE_PRIVATE_PLUGINPRIVATE);
 187   const std::string& fsid =
 188       fileapi::IsolatedContext::GetInstance()->RegisterFileSystemForVirtualPath(
 189           fileapi::kFileSystemTypePluginPrivate, root_name, base::FilePath());
 190
 191   // Grant full access of isolated filesystem to renderer process.
 192   content::ChildProcessSecurityPolicy* policy =
 193       content::ChildProcessSecurityPolicy::GetInstance();
 194   policy->GrantCreateReadWriteFileSystem(render_process_id_, fsid);
 195
 196   context->reply_msg = PpapiPluginMsg_IsolatedFileSystem_BrowserOpenReply(fsid);
 197   return PP_OK;
 198 }
 199
 200 }  // namespace chrome