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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 "chrome/browser/extensions/external_registry_loader_win.h"
#include "base/bind.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/files/scoped_file.h"
#include "base/metrics/histogram.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "base/strings/utf_string_conversions.h"
#include "base/time/time.h"
#include "base/values.h"
#include "base/version.h"
#include "base/win/registry.h"
#include "chrome/browser/extensions/external_provider_impl.h"
#include "components/crx_file/id_util.h"
#include "content/public/browser/browser_thread.h"
using content::BrowserThread;
namespace {
// The Registry subkey that contains information about external extensions.
const base::char16 kRegistryExtensions[] =
L"Software\\Google\\Chrome\\Extensions";
// Registry value of the key that defines the installation parameter.
const base::char16 kRegistryExtensionInstallParam[] = L"install_parameter";
// Registry value of the key that defines the path to the .crx file.
const base::char16 kRegistryExtensionPath[] = L"path";
// Registry value of that key that defines the current version of the .crx file.
const base::char16 kRegistryExtensionVersion[] = L"version";
// Registry value of the key that defines an external update URL.
const base::char16 kRegistryExtensionUpdateUrl[] = L"update_url";
bool CanOpenFileForReading(const base::FilePath& path) {
base::ScopedFILE file_handle(base::OpenFile(path, "rb"));
return file_handle.get() != NULL;
}
std::string MakePrefName(const std::string& extension_id,
const std::string& pref_name) {
return base::StringPrintf("%s.%s", extension_id.c_str(), pref_name.c_str());
}
} // namespace
namespace extensions {
void ExternalRegistryLoader::StartLoading() {
CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
BrowserThread::PostTask(
BrowserThread::FILE, FROM_HERE,
base::Bind(&ExternalRegistryLoader::LoadOnFileThread, this));
}
void ExternalRegistryLoader::LoadOnFileThread() {
CHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
base::TimeTicks start_time = base::TimeTicks::Now();
scoped_ptr<base::DictionaryValue> prefs(new base::DictionaryValue);
// A map of IDs, to weed out duplicates between HKCU and HKLM.
std::set<base::string16> keys;
base::win::RegistryKeyIterator iterator_machine_key(
HKEY_LOCAL_MACHINE,
kRegistryExtensions,
KEY_WOW64_32KEY);
for (; iterator_machine_key.Valid(); ++iterator_machine_key)
keys.insert(iterator_machine_key.Name());
base::win::RegistryKeyIterator iterator_user_key(
HKEY_CURRENT_USER, kRegistryExtensions);
for (; iterator_user_key.Valid(); ++iterator_user_key)
keys.insert(iterator_user_key.Name());
// Iterate over the keys found, first trying HKLM, then HKCU, as per Windows
// policy conventions. We only fall back to HKCU if the HKLM key cannot be
// opened, not if the data within the key is invalid, for example.
for (std::set<base::string16>::const_iterator it = keys.begin();
it != keys.end(); ++it) {
base::win::RegKey key;
base::string16 key_path = kRegistryExtensions;
key_path.append(L"\\");
key_path.append(*it);
if (key.Open(HKEY_LOCAL_MACHINE,
key_path.c_str(),
KEY_READ | KEY_WOW64_32KEY) != ERROR_SUCCESS &&
key.Open(HKEY_CURRENT_USER, key_path.c_str(), KEY_READ) !=
ERROR_SUCCESS) {
LOG(ERROR) << "Unable to read registry key at path (HKLM & HKCU): "
<< key_path << ".";
continue;
}
std::string id = base::UTF16ToASCII(*it);
base::StringToLowerASCII(&id);
if (!crx_file::id_util::IdIsValid(id)) {
LOG(ERROR) << "Invalid id value " << id
<< " for key " << key_path << ".";
continue;
}
base::string16 extension_dist_id;
if (key.ReadValue(kRegistryExtensionInstallParam, &extension_dist_id) ==
ERROR_SUCCESS) {
prefs->SetString(MakePrefName(id, ExternalProviderImpl::kInstallParam),
base::UTF16ToASCII(extension_dist_id));
}
// If there is an update URL present, copy it to prefs and ignore
// path and version keys for this entry.
base::string16 extension_update_url;
if (key.ReadValue(kRegistryExtensionUpdateUrl, &extension_update_url)
== ERROR_SUCCESS) {
prefs->SetString(
MakePrefName(id, ExternalProviderImpl::kExternalUpdateUrl),
base::UTF16ToASCII(extension_update_url));
continue;
}
base::string16 extension_path_str;
if (key.ReadValue(kRegistryExtensionPath, &extension_path_str)
!= ERROR_SUCCESS) {
// TODO(erikkay): find a way to get this into about:extensions
LOG(ERROR) << "Missing value " << kRegistryExtensionPath
<< " for key " << key_path << ".";
continue;
}
base::FilePath extension_path(extension_path_str);
if (!extension_path.IsAbsolute()) {
LOG(ERROR) << "File path " << extension_path_str
<< " needs to be absolute in key "
<< key_path;
continue;
}
if (!base::PathExists(extension_path)) {
LOG(ERROR) << "File " << extension_path_str
<< " for key " << key_path
<< " does not exist or is not readable.";
continue;
}
if (!CanOpenFileForReading(extension_path)) {
LOG(ERROR) << "File " << extension_path_str
<< " for key " << key_path << " can not be read. "
<< "Check that users who should have the extension "
<< "installed have permission to read it.";
continue;
}
base::string16 extension_version;
if (key.ReadValue(kRegistryExtensionVersion, &extension_version)
!= ERROR_SUCCESS) {
// TODO(erikkay): find a way to get this into about:extensions
LOG(ERROR) << "Missing value " << kRegistryExtensionVersion
<< " for key " << key_path << ".";
continue;
}
Version version(base::UTF16ToASCII(extension_version));
if (!version.IsValid()) {
LOG(ERROR) << "Invalid version value " << extension_version
<< " for key " << key_path << ".";
continue;
}
prefs->SetString(
MakePrefName(id, ExternalProviderImpl::kExternalVersion),
base::UTF16ToASCII(extension_version));
prefs->SetString(
MakePrefName(id, ExternalProviderImpl::kExternalCrx),
extension_path_str);
prefs->SetBoolean(
MakePrefName(id, ExternalProviderImpl::kMayBeUntrusted),
true);
}
prefs_.reset(prefs.release());
LOCAL_HISTOGRAM_TIMES("Extensions.ExternalRegistryLoaderWin",
base::TimeTicks::Now() - start_time);
BrowserThread::PostTask(
BrowserThread::UI, FROM_HERE,
base::Bind(&ExternalRegistryLoader::LoadFinished, this));
}
} // namespace extensions
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