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// Copyright 2013 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/renderer_host/pepper/pepper_isolated_file_system_message_filter.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/extensions/extension_service.h"
#include "chrome/browser/extensions/extension_system.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/profiles/profile_manager.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/common/pepper_permission_util.h"
#include "content/public/browser/browser_ppapi_host.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/child_process_security_policy.h"
#include "content/public/browser/render_view_host.h"
#include "extensions/common/constants.h"
#include "extensions/common/extension.h"
#include "extensions/common/extension_set.h"
#include "ppapi/c/pp_errors.h"
#include "ppapi/host/dispatch_host_message.h"
#include "ppapi/host/host_message_context.h"
#include "ppapi/host/ppapi_host.h"
#include "ppapi/proxy/ppapi_messages.h"
#include "ppapi/shared_impl/file_system_util.h"
#include "webkit/browser/fileapi/isolated_context.h"
namespace chrome {
namespace {
const char* kPredefinedAllowedCrxFsOrigins[] = {
"6EAED1924DB611B6EEF2A664BD077BE7EAD33B8F", // see crbug.com/234789
"4EB74897CB187C7633357C2FE832E0AD6A44883A" // see crbug.com/234789
};
} // namespace
// static
PepperIsolatedFileSystemMessageFilter*
PepperIsolatedFileSystemMessageFilter::Create(
PP_Instance instance, content::BrowserPpapiHost* host) {
int render_process_id;
int unused_render_frame_id;
if (!host->GetRenderFrameIDsForInstance(instance,
&render_process_id,
&unused_render_frame_id)) {
return NULL;
}
return new PepperIsolatedFileSystemMessageFilter(
render_process_id,
host->GetProfileDataDirectory(),
host->GetDocumentURLForInstance(instance),
host->GetPpapiHost());
}
PepperIsolatedFileSystemMessageFilter::PepperIsolatedFileSystemMessageFilter(
int render_process_id,
const base::FilePath& profile_directory,
const GURL& document_url,
ppapi::host::PpapiHost* ppapi_host)
: render_process_id_(render_process_id),
profile_directory_(profile_directory),
document_url_(document_url),
ppapi_host_(ppapi_host) {
for (size_t i = 0; i < arraysize(kPredefinedAllowedCrxFsOrigins); ++i)
allowed_crxfs_origins_.insert(kPredefinedAllowedCrxFsOrigins[i]);
}
PepperIsolatedFileSystemMessageFilter::
~PepperIsolatedFileSystemMessageFilter() {
}
scoped_refptr<base::TaskRunner>
PepperIsolatedFileSystemMessageFilter::OverrideTaskRunnerForMessage(
const IPC::Message& msg) {
// In order to reach ExtensionSystem, we need to get ProfileManager first.
// ProfileManager lives in UI thread, so we need to do this in UI thread.
return content::BrowserThread::GetMessageLoopProxyForThread(
content::BrowserThread::UI);
}
int32_t PepperIsolatedFileSystemMessageFilter::OnResourceMessageReceived(
const IPC::Message& msg,
ppapi::host::HostMessageContext* context) {
IPC_BEGIN_MESSAGE_MAP(PepperIsolatedFileSystemMessageFilter, msg)
PPAPI_DISPATCH_HOST_RESOURCE_CALL(
PpapiHostMsg_IsolatedFileSystem_BrowserOpen, OnOpenFileSystem);
IPC_END_MESSAGE_MAP()
return PP_ERROR_FAILED;
}
Profile* PepperIsolatedFileSystemMessageFilter::GetProfile() {
DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
ProfileManager* profile_manager = g_browser_process->profile_manager();
return profile_manager->GetProfile(profile_directory_);
}
std::string PepperIsolatedFileSystemMessageFilter::CreateCrxFileSystem(
Profile* profile) {
extensions::ExtensionSystem* extension_system =
extensions::ExtensionSystem::Get(profile);
if (!extension_system)
return std::string();
const ExtensionService* extension_service =
extension_system->extension_service();
if (!extension_service)
return std::string();
const extensions::Extension* extension =
extension_service->GetExtensionById(document_url_.host(), false);
if (!extension)
return std::string();
// First level directory for isolated filesystem to lookup.
std::string kFirstLevelDirectory("crxfs");
return fileapi::IsolatedContext::GetInstance()->
RegisterFileSystemForPath(fileapi::kFileSystemTypeNativeLocal,
extension->path(),
&kFirstLevelDirectory);
}
int32_t PepperIsolatedFileSystemMessageFilter::OnOpenFileSystem(
ppapi::host::HostMessageContext* context,
PP_IsolatedFileSystemType_Private type) {
switch (type) {
case PP_ISOLATEDFILESYSTEMTYPE_PRIVATE_INVALID:
break;
case PP_ISOLATEDFILESYSTEMTYPE_PRIVATE_CRX:
return OpenCrxFileSystem(context);
case PP_ISOLATEDFILESYSTEMTYPE_PRIVATE_PLUGINPRIVATE:
return OpenPluginPrivateFileSystem(context);
}
NOTREACHED();
context->reply_msg =
PpapiPluginMsg_IsolatedFileSystem_BrowserOpenReply(std::string());
return PP_ERROR_FAILED;
}
int32_t PepperIsolatedFileSystemMessageFilter::OpenCrxFileSystem(
ppapi::host::HostMessageContext* context) {
Profile* profile = GetProfile();
const extensions::ExtensionSet* extension_set = NULL;
if (profile) {
extension_set = extensions::ExtensionSystem::Get(profile)->
extension_service()->extensions();
}
if (!IsExtensionOrSharedModuleWhitelisted(
document_url_, extension_set, allowed_crxfs_origins_) &&
!IsHostAllowedByCommandLine(
document_url_, extension_set, switches::kAllowNaClCrxFsAPI)) {
LOG(ERROR) << "Host " << document_url_.host() << " cannot use CrxFs API.";
return PP_ERROR_NOACCESS;
}
// TODO(raymes): When we remove FileSystem from the renderer, we should create
// a pending PepperFileSystemBrowserHost here with the fsid and send the
// pending host ID back to the plugin.
const std::string fsid = CreateCrxFileSystem(profile);
if (fsid.empty()) {
context->reply_msg =
PpapiPluginMsg_IsolatedFileSystem_BrowserOpenReply(std::string());
return PP_ERROR_NOTSUPPORTED;
}
// Grant readonly access of isolated filesystem to renderer process.
content::ChildProcessSecurityPolicy* policy =
content::ChildProcessSecurityPolicy::GetInstance();
policy->GrantReadFileSystem(render_process_id_, fsid);
context->reply_msg = PpapiPluginMsg_IsolatedFileSystem_BrowserOpenReply(fsid);
return PP_OK;
}
int32_t PepperIsolatedFileSystemMessageFilter::OpenPluginPrivateFileSystem(
ppapi::host::HostMessageContext* context) {
DCHECK(ppapi_host_);
// Only plugins with private permission can open the filesystem.
if (!ppapi_host_->permissions().HasPermission(ppapi::PERMISSION_PRIVATE))
return PP_ERROR_NOACCESS;
const std::string& root_name = ppapi::IsolatedFileSystemTypeToRootName(
PP_ISOLATEDFILESYSTEMTYPE_PRIVATE_PLUGINPRIVATE);
const std::string& fsid =
fileapi::IsolatedContext::GetInstance()->RegisterFileSystemForVirtualPath(
fileapi::kFileSystemTypePluginPrivate, root_name, base::FilePath());
// Grant full access of isolated filesystem to renderer process.
content::ChildProcessSecurityPolicy* policy =
content::ChildProcessSecurityPolicy::GetInstance();
policy->GrantCreateReadWriteFileSystem(render_process_id_, fsid);
context->reply_msg = PpapiPluginMsg_IsolatedFileSystem_BrowserOpenReply(fsid);
return PP_OK;
}
} // namespace chrome
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