pepper_isolated_file_system_message_filter.cc revision 6d86b77056ed63eb6871182f42a9fd5f07550f90 
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
29namespace chrome {
30
31namespace {
32
33const char* kPredefinedAllowedCrxFsOrigins[] = {
34    "6EAED1924DB611B6EEF2A664BD077BE7EAD33B8F",  // see crbug.com/234789
35    "4EB74897CB187C7633357C2FE832E0AD6A44883A"   // see crbug.com/234789
36};
37
38}  // namespace
39
40// static
41PepperIsolatedFileSystemMessageFilter*
42PepperIsolatedFileSystemMessageFilter::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
57PepperIsolatedFileSystemMessageFilter::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
70PepperIsolatedFileSystemMessageFilter::
71    ~PepperIsolatedFileSystemMessageFilter() {}
72
73scoped_refptr<base::TaskRunner>
74PepperIsolatedFileSystemMessageFilter::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
82int32_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
93Profile* 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
99std::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
125int32_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
142int32_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
178int32_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
201