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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/extensions/api/file_system/chrome_file_system_delegate.h"
#include <utility>
#include <vector>
#include "apps/saved_files_service.h"
#include "base/bind.h"
#include "base/callback.h"
#include "base/files/file_path.h"
#include "base/logging.h"
#include "base/path_service.h"
#include "base/strings/string16.h"
#include "chrome/browser/extensions/api/file_system/file_entry_picker.h"
#include "chrome/browser/extensions/chrome_extension_function_details.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/ui/apps/directory_access_confirmation_dialog.h"
#include "chrome/common/chrome_paths.h"
#include "chrome/grit/generated_resources.h"
#include "content/public/browser/browser_context.h"
#include "content/public/browser/child_process_security_policy.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/browser/render_process_host.h"
#include "content/public/browser/storage_partition.h"
#include "content/public/browser/web_contents.h"
#include "extensions/browser/api/file_handlers/app_file_handler_util.h"
#include "extensions/browser/api/file_system/saved_files_service_interface.h"
#include "extensions/browser/app_window/app_window.h"
#include "extensions/browser/app_window/app_window_registry.h"
#include "extensions/browser/extension_function.h"
#include "extensions/browser/extension_prefs.h"
#include "extensions/browser/extension_system.h"
#include "extensions/browser/extension_util.h"
#include "extensions/common/api/file_system.h"
#include "extensions/common/extension.h"
#include "storage/browser/fileapi/external_mount_points.h"
#include "storage/browser/fileapi/isolated_context.h"
#include "storage/common/fileapi/file_system_types.h"
#include "storage/common/fileapi/file_system_util.h"
#include "ui/shell_dialogs/select_file_dialog.h"
#if defined(OS_MACOSX)
#include <CoreFoundation/CoreFoundation.h>
#include "base/mac/foundation_util.h"
#endif
#if defined(OS_CHROMEOS)
#include "chrome/browser/chromeos/file_manager/volume_manager.h"
#include "chrome/browser/extensions/api/file_system/consent_provider.h"
#include "extensions/browser/event_router.h"
#include "extensions/browser/extension_registry.h"
#include "extensions/common/constants.h"
#include "url/url_constants.h"
#endif
namespace extensions {
namespace file_system = api::file_system;
#if defined(OS_CHROMEOS)
using file_system_api::ConsentProvider;
using file_system_api::ConsentProviderDelegate;
namespace {
const char kConsentImpossible[] =
"Impossible to ask for user consent as there is no app window visible.";
const char kNotSupportedOnNonKioskSessionError[] =
"Operation only supported for kiosk apps running in a kiosk session.";
const char kRequiresFileSystemWriteError[] =
"Operation requires fileSystem.write permission";
const char kSecurityError[] = "Security error.";
const char kVolumeNotFoundError[] = "Volume not found.";
// Fills a list of volumes mounted in the system.
bool GetVolumeListForExtension(
const std::vector<base::WeakPtr<file_manager::Volume>>& available_volumes,
ConsentProvider* consent_provider,
const Extension& extension,
std::vector<file_system::Volume>* result_volumes) {
if (!consent_provider)
return false;
const FileSystemDelegate::GrantVolumesMode mode =
consent_provider->GetGrantVolumesMode(extension);
if (mode == FileSystemDelegate::kGrantNone)
return false;
// Convert available_volumes to result_volume_list.
for (const auto& volume : available_volumes) {
if (mode == FileSystemDelegate::kGrantAll ||
(mode == FileSystemDelegate::kGrantPerVolume &&
consent_provider->IsGrantableForVolume(extension, volume))) {
file_system::Volume result_volume;
result_volume.volume_id = volume->volume_id();
result_volume.writable = !volume->is_read_only();
result_volumes->push_back(std::move(result_volume));
}
}
return true;
}
// Callback called when consent is granted or denied.
void OnConsentReceived(
content::BrowserContext* browser_context,
scoped_refptr<UIThreadExtensionFunction> requester,
const FileSystemDelegate::FileSystemCallback& success_callback,
const FileSystemDelegate::ErrorCallback& error_callback,
const std::string& extension_id,
const base::WeakPtr<file_manager::Volume>& volume,
bool writable,
ConsentProvider::Consent result) {
using file_manager::VolumeManager;
using file_manager::Volume;
// Render frame host can be gone before this callback method is executed.
if (!requester->render_frame_host()) {
error_callback.Run(std::string());
return;
}
switch (result) {
case ConsentProvider::CONSENT_REJECTED:
error_callback.Run(kSecurityError);
return;
case ConsentProvider::CONSENT_IMPOSSIBLE:
error_callback.Run(kConsentImpossible);
return;
case ConsentProvider::CONSENT_GRANTED:
break;
}
if (!volume.get()) {
error_callback.Run(kVolumeNotFoundError);
return;
}
const GURL site = util::GetSiteForExtensionId(extension_id, browser_context);
scoped_refptr<storage::FileSystemContext> file_system_context =
content::BrowserContext::GetStoragePartitionForSite(browser_context, site)
->GetFileSystemContext();
storage::ExternalFileSystemBackend* const backend =
file_system_context->external_backend();
DCHECK(backend);
base::FilePath virtual_path;
if (!backend->GetVirtualPath(volume->mount_path(), &virtual_path)) {
error_callback.Run(kSecurityError);
return;
}
storage::IsolatedContext* const isolated_context =
storage::IsolatedContext::GetInstance();
DCHECK(isolated_context);
const storage::FileSystemURL original_url =
file_system_context->CreateCrackedFileSystemURL(
GURL(std::string(kExtensionScheme) + url::kStandardSchemeSeparator +
extension_id),
storage::kFileSystemTypeExternal, virtual_path);
// Set a fixed register name, as the automatic one would leak the mount point
// directory.
std::string register_name = "fs";
const std::string file_system_id =
isolated_context->RegisterFileSystemForPath(
storage::kFileSystemTypeNativeForPlatformApp,
std::string() /* file_system_id */, original_url.path(),
®ister_name);
if (file_system_id.empty()) {
error_callback.Run(kSecurityError);
return;
}
backend->GrantFileAccessToExtension(extension_id, virtual_path);
// Grant file permissions to the renderer hosting component.
content::ChildProcessSecurityPolicy* policy =
content::ChildProcessSecurityPolicy::GetInstance();
DCHECK(policy);
const auto process_id = requester->render_frame_host()->GetProcess()->GetID();
// Read-only permisisons.
policy->GrantReadFile(process_id, volume->mount_path());
policy->GrantReadFileSystem(process_id, file_system_id);
// Additional write permissions.
if (writable) {
policy->GrantCreateReadWriteFile(process_id, volume->mount_path());
policy->GrantCopyInto(process_id, volume->mount_path());
policy->GrantWriteFileSystem(process_id, file_system_id);
policy->GrantDeleteFromFileSystem(process_id, file_system_id);
policy->GrantCreateFileForFileSystem(process_id, file_system_id);
}
success_callback.Run(file_system_id, register_name);
}
} // namespace
namespace file_system_api {
void DispatchVolumeListChangeEvent(content::BrowserContext* browser_context) {
DCHECK(browser_context);
EventRouter* const event_router = EventRouter::Get(browser_context);
if (!event_router) // Possible on shutdown.
return;
ExtensionRegistry* const registry = ExtensionRegistry::Get(browser_context);
if (!registry) // Possible on shutdown.
return;
ConsentProviderDelegate consent_provider_delegate(
Profile::FromBrowserContext(browser_context));
ConsentProvider consent_provider(&consent_provider_delegate);
const std::vector<base::WeakPtr<file_manager::Volume>> volume_list =
file_manager::VolumeManager::Get(browser_context)->GetVolumeList();
for (const auto& extension : registry->enabled_extensions()) {
file_system::VolumeListChangedEvent event_args;
if (!GetVolumeListForExtension(volume_list, &consent_provider,
*extension.get(), &event_args.volumes)) {
continue;
}
event_router->DispatchEventToExtension(
extension->id(),
std::make_unique<Event>(
events::FILE_SYSTEM_ON_VOLUME_LIST_CHANGED,
file_system::OnVolumeListChanged::kEventName,
file_system::OnVolumeListChanged::Create(event_args)));
}
}
} // namespace file_system_api
#endif // defined(OS_CHROMEOS)
ChromeFileSystemDelegate::ChromeFileSystemDelegate() {}
ChromeFileSystemDelegate::~ChromeFileSystemDelegate() {}
base::FilePath ChromeFileSystemDelegate::GetDefaultDirectory() {
base::FilePath documents_dir;
base::PathService::Get(chrome::DIR_USER_DOCUMENTS, &documents_dir);
return documents_dir;
}
bool ChromeFileSystemDelegate::ShowSelectFileDialog(
scoped_refptr<UIThreadExtensionFunction> extension_function,
ui::SelectFileDialog::Type type,
const base::FilePath& default_path,
const ui::SelectFileDialog::FileTypeInfo* file_types,
FileSystemDelegate::FilesSelectedCallback files_selected_callback,
base::OnceClosure file_selection_canceled_callback) {
const Extension* extension = extension_function->extension();
content::WebContents* web_contents =
extension_function->GetSenderWebContents();
if (!web_contents)
return false;
// TODO(asargent/benwells) - As a short term remediation for
// crbug.com/179010 we're adding the ability for a whitelisted extension to
// use this API since chrome.fileBrowserHandler.selectFile is ChromeOS-only.
// Eventually we'd like a better solution and likely this code will go back
// to being platform-app only.
// Make sure there is an app window associated with the web contents, so that
// platform apps cannot open the file picker from a background page.
// TODO(michaelpg): As a workaround for https://crbug.com/736930, allow this
// to work from a background page for non-platform apps (which, in practice,
// is restricted to whitelisted extensions).
if (extension->is_platform_app() &&
!AppWindowRegistry::Get(extension_function->browser_context())
->GetAppWindowForWebContents(web_contents)) {
return false;
}
// The file picker will hold a reference to the UIThreadExtensionFunction
// instance, preventing its destruction (and subsequent sending of the
// function response) until the user has selected a file or cancelled the
// picker. At that point, the picker will delete itself, which will also free
// the function instance.
new FileEntryPicker(web_contents, default_path, *file_types, type,
std::move(files_selected_callback),
std::move(file_selection_canceled_callback));
return true;
}
void ChromeFileSystemDelegate::ConfirmSensitiveDirectoryAccess(
bool has_write_permission,
const base::string16& app_name,
content::WebContents* web_contents,
const base::Closure& on_accept,
const base::Closure& on_cancel) {
CreateDirectoryAccessConfirmationDialog(has_write_permission, app_name,
web_contents, on_accept, on_cancel);
}
int ChromeFileSystemDelegate::GetDescriptionIdForAcceptType(
const std::string& accept_type) {
if (accept_type == "image/*")
return IDS_IMAGE_FILES;
if (accept_type == "audio/*")
return IDS_AUDIO_FILES;
if (accept_type == "video/*")
return IDS_VIDEO_FILES;
return 0;
}
#if defined(OS_CHROMEOS)
FileSystemDelegate::GrantVolumesMode
ChromeFileSystemDelegate::GetGrantVolumesMode(
content::BrowserContext* browser_context,
content::RenderFrameHost* render_frame_host,
const Extension& extension) {
// Only kiosk apps in kiosk sessions can use this API.
// Additionally it is enabled for whitelisted component extensions and apps.
ConsentProviderDelegate consent_provider_delegate(
Profile::FromBrowserContext(browser_context));
return ConsentProvider(&consent_provider_delegate)
.GetGrantVolumesMode(extension);
}
void ChromeFileSystemDelegate::RequestFileSystem(
content::BrowserContext* browser_context,
scoped_refptr<UIThreadExtensionFunction> requester,
const Extension& extension,
std::string volume_id,
bool writable,
const FileSystemCallback& success_callback,
const ErrorCallback& error_callback) {
ConsentProviderDelegate consent_provider_delegate(
Profile::FromBrowserContext(browser_context));
ConsentProvider consent_provider(&consent_provider_delegate);
using file_manager::VolumeManager;
using file_manager::Volume;
VolumeManager* const volume_manager = VolumeManager::Get(browser_context);
DCHECK(volume_manager);
if (writable &&
!app_file_handler_util::HasFileSystemWritePermission(&extension)) {
error_callback.Run(kRequiresFileSystemWriteError);
return;
}
if (consent_provider.GetGrantVolumesMode(extension) ==
FileSystemDelegate::kGrantNone) {
error_callback.Run(kNotSupportedOnNonKioskSessionError);
return;
}
base::WeakPtr<file_manager::Volume> volume =
volume_manager->FindVolumeById(volume_id);
if (!volume.get() ||
!consent_provider.IsGrantableForVolume(extension, volume)) {
error_callback.Run(kVolumeNotFoundError);
return;
}
const GURL site =
util::GetSiteForExtensionId(extension.id(), browser_context);
scoped_refptr<storage::FileSystemContext> file_system_context =
content::BrowserContext::GetStoragePartitionForSite(browser_context, site)
->GetFileSystemContext();
storage::ExternalFileSystemBackend* const backend =
file_system_context->external_backend();
DCHECK(backend);
base::FilePath virtual_path;
if (!backend->GetVirtualPath(volume->mount_path(), &virtual_path)) {
error_callback.Run(kSecurityError);
return;
}
if (writable && (volume->is_read_only())) {
error_callback.Run(kSecurityError);
return;
}
const ConsentProvider::ConsentCallback& callback = base::Bind(
&OnConsentReceived, browser_context, requester, success_callback,
error_callback, extension.id(), volume, writable);
consent_provider.RequestConsent(extension, requester->render_frame_host(),
volume, writable, callback);
}
void ChromeFileSystemDelegate::GetVolumeList(
content::BrowserContext* browser_context,
const Extension& extension,
const VolumeListCallback& success_callback,
const ErrorCallback& error_callback) {
ConsentProviderDelegate consent_provider_delegate(
Profile::FromBrowserContext(browser_context));
ConsentProvider consent_provider(&consent_provider_delegate);
const std::vector<base::WeakPtr<file_manager::Volume>> volume_list =
file_manager::VolumeManager::Get(browser_context)->GetVolumeList();
std::vector<file_system::Volume> result_volume_list;
GetVolumeListForExtension(volume_list, &consent_provider, extension,
&result_volume_list);
success_callback.Run(result_volume_list);
}
#endif // defined(OS_CHROMEOS)
SavedFilesServiceInterface* ChromeFileSystemDelegate::GetSavedFilesService(
content::BrowserContext* browser_context) {
return apps::SavedFilesService::Get(browser_context);
}
} // namespace extensions
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