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// Copyright (c) 2012 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 "content/browser/fileapi/browser_file_system_helper.h"
#include <string>
#include <vector>
#include "base/command_line.h"
#include "base/files/file_path.h"
#include "base/sequenced_task_runner.h"
#include "base/threading/sequenced_worker_pool.h"
#include "content/browser/child_process_security_policy_impl.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/content_browser_client.h"
#include "content/public/common/content_client.h"
#include "content/public/common/content_switches.h"
#include "content/public/common/url_constants.h"
#include "webkit/browser/fileapi/external_mount_points.h"
#include "webkit/browser/fileapi/file_permission_policy.h"
#include "webkit/browser/fileapi/file_system_operation_runner.h"
#include "webkit/browser/fileapi/file_system_options.h"
#include "webkit/browser/fileapi/file_system_task_runners.h"
#include "webkit/browser/fileapi/sandbox_mount_point_provider.h"
#include "webkit/browser/quota/quota_manager.h"
namespace content {
namespace {
using fileapi::FileSystemOptions;
FileSystemOptions CreateBrowserFileSystemOptions(bool is_incognito) {
FileSystemOptions::ProfileMode profile_mode =
is_incognito ? FileSystemOptions::PROFILE_MODE_INCOGNITO
: FileSystemOptions::PROFILE_MODE_NORMAL;
std::vector<std::string> additional_allowed_schemes;
GetContentClient()->browser()->GetAdditionalAllowedSchemesForFileSystem(
&additional_allowed_schemes);
if (CommandLine::ForCurrentProcess()->HasSwitch(
switches::kAllowFileAccessFromFiles)) {
additional_allowed_schemes.push_back(chrome::kFileScheme);
}
return FileSystemOptions(profile_mode, additional_allowed_schemes);
}
} // namespace
scoped_refptr<fileapi::FileSystemContext> CreateFileSystemContext(
const base::FilePath& profile_path,
bool is_incognito,
fileapi::ExternalMountPoints* external_mount_points,
quota::SpecialStoragePolicy* special_storage_policy,
quota::QuotaManagerProxy* quota_manager_proxy) {
base::SequencedWorkerPool* pool = content::BrowserThread::GetBlockingPool();
scoped_refptr<base::SequencedTaskRunner> file_task_runner =
pool->GetSequencedTaskRunner(pool->GetNamedSequenceToken("FileAPI"));
scoped_ptr<fileapi::FileSystemTaskRunners> task_runners(
new fileapi::FileSystemTaskRunners(
BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO).get(),
file_task_runner.get()));
// Setting up additional mount point providers.
ScopedVector<fileapi::FileSystemMountPointProvider> additional_providers;
GetContentClient()->browser()->GetAdditionalFileSystemMountPointProviders(
profile_path, &additional_providers);
return new fileapi::FileSystemContext(
task_runners.Pass(),
external_mount_points,
special_storage_policy,
quota_manager_proxy,
additional_providers.Pass(),
profile_path,
CreateBrowserFileSystemOptions(is_incognito));
}
bool CheckFileSystemPermissionsForProcess(
fileapi::FileSystemContext* context, int process_id,
const fileapi::FileSystemURL& url, int permissions,
base::PlatformFileError* error) {
DCHECK(error);
*error = base::PLATFORM_FILE_OK;
if (!url.is_valid()) {
*error = base::PLATFORM_FILE_ERROR_INVALID_URL;
return false;
}
fileapi::FileSystemMountPointProvider* mount_point_provider =
context->GetMountPointProvider(url.type());
if (!mount_point_provider) {
*error = base::PLATFORM_FILE_ERROR_INVALID_URL;
return false;
}
base::FilePath file_path;
ChildProcessSecurityPolicyImpl* policy =
ChildProcessSecurityPolicyImpl::GetInstance();
switch (mount_point_provider->GetPermissionPolicy(url, permissions)) {
case fileapi::FILE_PERMISSION_ALWAYS_DENY:
*error = base::PLATFORM_FILE_ERROR_SECURITY;
return false;
case fileapi::FILE_PERMISSION_ALWAYS_ALLOW:
CHECK(mount_point_provider == context->sandbox_provider());
return true;
case fileapi::FILE_PERMISSION_USE_FILE_PERMISSION: {
const bool success = policy->HasPermissionsForFile(
process_id, url.path(), permissions);
if (!success)
*error = base::PLATFORM_FILE_ERROR_SECURITY;
return success;
}
case fileapi::FILE_PERMISSION_USE_FILESYSTEM_PERMISSION: {
const bool success = policy->HasPermissionsForFileSystem(
process_id, url.mount_filesystem_id(), permissions);
if (!success)
*error = base::PLATFORM_FILE_ERROR_SECURITY;
return success;
}
}
NOTREACHED();
*error = base::PLATFORM_FILE_ERROR_SECURITY;
return false;
}
void SyncGetPlatformPath(fileapi::FileSystemContext* context,
int process_id,
const GURL& path,
base::FilePath* platform_path) {
DCHECK(context->task_runners()->file_task_runner()->
RunsTasksOnCurrentThread());
DCHECK(platform_path);
*platform_path = base::FilePath();
fileapi::FileSystemURL url(context->CrackURL(path));
if (!url.is_valid())
return;
// Make sure if this file is ok to be read (in the current architecture
// which means roughly same as the renderer is allowed to get the platform
// path to the file).
base::PlatformFileError error;
if (!CheckFileSystemPermissionsForProcess(
context, process_id, url, fileapi::kReadFilePermissions, &error))
return;
context->operation_runner()->SyncGetPlatformPath(url, platform_path);
// The path is to be attached to URLLoader so we grant read permission
// for the file. (We first need to check if it can already be read not to
// overwrite existing permissions)
if (!ChildProcessSecurityPolicyImpl::GetInstance()->CanReadFile(
process_id, *platform_path)) {
ChildProcessSecurityPolicyImpl::GetInstance()->GrantReadFile(
process_id, *platform_path);
}
}
} // namespace content
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