| // 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); |
| } |
| } |