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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/install_module_verifier_win.h"
#include <string>
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/logging.h"
#include "base/md5.h"
#include "base/memory/scoped_ptr.h"
#include "base/metrics/sparse_histogram.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_tokenizer.h"
#include "base/strings/string_util.h"
#include "base/values.h"
#include "chrome/browser/chrome_notification_types.h"
#include "chrome/browser/enumerate_modules_model_win.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
#include "content/public/browser/notification_service.h"
#include "content/public/browser/notification_source.h"
#include "grit/browser_resources.h"
#include "ui/base/resource/resource_bundle.h"
namespace {
struct { size_t id; const char* module_name_digest; }
kExpectedInstallModules[] = {
{1u, "c8cc47613e155f2129f480c6ced84549"}, // chrome.dll
{2u, "49b78a23b0d8d5d8fb60d4e472b22764"}, // chrome_child.dll
};
// Helper to extract canonical loaded module names from the EnumerateModulesWin
// output and then verify the results.
void VerifyEnumeratedModules(const base::ListValue& module_list) {
std::set<std::string> module_name_digests;
ExtractLoadedModuleNameDigests(module_list, &module_name_digests);
AdditionalModules additional_modules;
ParseAdditionalModules(
ResourceBundle::GetSharedInstance().GetRawDataResource(
IDR_ADDITIONAL_MODULES_LIST),
&additional_modules);
std::set<size_t> installed_module_ids;
VerifyModules(module_name_digests, additional_modules, &installed_module_ids);
for (std::set<size_t>::iterator it = installed_module_ids.begin();
it != installed_module_ids.end();
++it) {
UMA_HISTOGRAM_SPARSE_SLOWLY("InstallVerifier.ModuleMatch", *it);
}
}
// Waits for NOTIFICATION_MODULE_LIST_ENUMERATED, which indicates that
// EnumerateModulesWin has completed its work. Retrieves the enumerated module
// list and processes it.
class InstallModuleVerifier : public content::NotificationObserver {
public:
// Creates an instance that will wait for module enumeration to complete,
// process the results, and then delete itself.
static void WaitForModuleList() {
// Will delete itself when scan results are available.
new InstallModuleVerifier();
}
private:
InstallModuleVerifier() {
notification_registrar_.Add(this,
chrome::NOTIFICATION_MODULE_LIST_ENUMERATED,
content::NotificationService::AllSources());
}
~InstallModuleVerifier() {}
// content::NotificationObserver implementation.
virtual void Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) OVERRIDE {
DCHECK_EQ(type, chrome::NOTIFICATION_MODULE_LIST_ENUMERATED);
EnumerateModulesModel* model =
content::Source<EnumerateModulesModel>(source).ptr();
scoped_ptr<base::ListValue> module_list(model->GetModuleList());
if (module_list.get())
VerifyEnumeratedModules(*module_list);
delete this;
}
content::NotificationRegistrar notification_registrar_;
DISALLOW_COPY_AND_ASSIGN(InstallModuleVerifier);
};
} // namespace
void BeginModuleVerification() {
scoped_ptr<base::ListValue> module_list(
EnumerateModulesModel::GetInstance()->GetModuleList());
if (module_list.get()) {
VerifyEnumeratedModules(*module_list);
} else {
InstallModuleVerifier::WaitForModuleList();
EnumerateModulesModel::GetInstance()->ScanNow();
}
}
void ExtractLoadedModuleNameDigests(
const base::ListValue& module_list,
std::set<std::string>* module_name_digests) {
DCHECK(module_name_digests);
// EnumerateModulesModel produces a list of dictionaries.
// Each dictionary corresponds to a module and exposes a number of properties.
// We care only about 'type' and 'name'.
for (size_t i = 0; i < module_list.GetSize(); ++i) {
const base::DictionaryValue* module_dictionary = NULL;
if (!module_list.GetDictionary(i, &module_dictionary))
continue;
ModuleEnumerator::ModuleType module_type =
ModuleEnumerator::LOADED_MODULE;
if (!module_dictionary->GetInteger(
"type", reinterpret_cast<int*>(&module_type)) ||
module_type != ModuleEnumerator::LOADED_MODULE) {
continue;
}
std::string module_name;
if (!module_dictionary->GetString("name", &module_name))
continue;
StringToLowerASCII(&module_name);
module_name_digests->insert(base::MD5String(module_name));
}
}
void VerifyModules(
const std::set<std::string>& module_name_digests,
const AdditionalModules& additional_modules,
std::set<size_t>* installed_module_ids) {
DCHECK(installed_module_ids);
for (size_t i = 0; i < arraysize(kExpectedInstallModules); ++i) {
if (module_name_digests.find(
kExpectedInstallModules[i].module_name_digest) !=
module_name_digests.end()) {
installed_module_ids->insert(kExpectedInstallModules[i].id);
}
}
for (AdditionalModules::const_iterator it = additional_modules.begin();
it != additional_modules.end(); ++it) {
std::string additional_module = it->second.as_string();
StringToLowerASCII(&additional_module);
if (module_name_digests.find(additional_module)
!= module_name_digests.end()) {
installed_module_ids->insert(it->first);
}
}
}
namespace {
// Parses a line consisting of a positive decimal number and a 32-digit
// hexadecimal number, separated by a space. Inserts the output, if valid, into
// |additional_modules|. Unexpected leading or trailing characters will cause
// the line to be ignored, as will invalid decimal/hexadecimal characters.
void ParseAdditionalModuleLine(
const base::StringPiece& line,
AdditionalModules* additional_modules) {
DCHECK(additional_modules);
base::CStringTokenizer line_tokenizer(line.begin(), line.end(), " ");
if (!line_tokenizer.GetNext())
return; // Empty string.
base::StringPiece id_piece(line_tokenizer.token_piece());
if (!line_tokenizer.GetNext())
return; // No delimiter (' ').
base::StringPiece digest_piece(line_tokenizer.token_piece());
if (line_tokenizer.GetNext())
return; // Unexpected trailing characters.
unsigned id = 0;
if (!StringToUint(id_piece, &id))
return; // First token was not decimal.
if (digest_piece.length() != 32)
return; // Second token is not the right length.
for (base::StringPiece::const_iterator it = digest_piece.begin();
it != digest_piece.end(); ++it) {
if (!IsHexDigit(*it))
return; // Second token has invalid characters.
}
// This is a valid line.
additional_modules->push_back(std::make_pair(id, digest_piece));
}
} // namespace
void ParseAdditionalModules(
const base::StringPiece& raw_data,
AdditionalModules* additional_modules) {
DCHECK(additional_modules);
base::CStringTokenizer file_tokenizer(raw_data.begin(),
raw_data.end(),
"\r\n");
while (file_tokenizer.GetNext()) {
ParseAdditionalModuleLine(base::StringPiece(file_tokenizer.token_piece()),
additional_modules);
}
}
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