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348 lines
13 KiB
348 lines
13 KiB
/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "veridex.h"
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#include <android-base/file.h>
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#include <android-base/strings.h>
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#include "dex/dex_file.h"
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#include "dex/dex_file_loader.h"
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#include "hidden_api.h"
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#include "hidden_api_finder.h"
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#include "precise_hidden_api_finder.h"
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#include "resolver.h"
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#include <cstdlib>
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#include <sstream>
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namespace art {
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static VeriClass z_(Primitive::Type::kPrimBoolean, 0, nullptr);
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static VeriClass b_(Primitive::Type::kPrimByte, 0, nullptr);
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static VeriClass c_(Primitive::Type::kPrimChar, 0, nullptr);
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static VeriClass s_(Primitive::Type::kPrimShort, 0, nullptr);
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static VeriClass i_(Primitive::Type::kPrimInt, 0, nullptr);
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static VeriClass f_(Primitive::Type::kPrimFloat, 0, nullptr);
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static VeriClass d_(Primitive::Type::kPrimDouble, 0, nullptr);
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static VeriClass j_(Primitive::Type::kPrimLong, 0, nullptr);
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static VeriClass v_(Primitive::Type::kPrimVoid, 0, nullptr);
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VeriClass* VeriClass::boolean_ = &z_;
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VeriClass* VeriClass::byte_ = &b_;
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VeriClass* VeriClass::char_ = &c_;
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VeriClass* VeriClass::short_ = &s_;
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VeriClass* VeriClass::integer_ = &i_;
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VeriClass* VeriClass::float_ = &f_;
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VeriClass* VeriClass::double_ = &d_;
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VeriClass* VeriClass::long_ = &j_;
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VeriClass* VeriClass::void_ = &v_;
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// Will be set after boot classpath has been resolved.
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VeriClass* VeriClass::object_ = nullptr;
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VeriClass* VeriClass::class_ = nullptr;
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VeriClass* VeriClass::class_loader_ = nullptr;
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VeriClass* VeriClass::string_ = nullptr;
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VeriClass* VeriClass::throwable_ = nullptr;
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VeriMethod VeriClass::forName_ = nullptr;
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VeriMethod VeriClass::getField_ = nullptr;
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VeriMethod VeriClass::getDeclaredField_ = nullptr;
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VeriMethod VeriClass::getMethod_ = nullptr;
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VeriMethod VeriClass::getDeclaredMethod_ = nullptr;
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VeriMethod VeriClass::getClass_ = nullptr;
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VeriMethod VeriClass::loadClass_ = nullptr;
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VeriField VeriClass::sdkInt_ = nullptr;
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static const char* kDexFileOption = "--dex-file=";
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static const char* kStubsOption = "--core-stubs=";
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static const char* kFlagsOption = "--api-flags=";
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static const char* kImprecise = "--imprecise";
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static const char* kTargetSdkVersion = "--target-sdk-version=";
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static const char* kAppClassFilter = "--app-class-filter=";
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static const char* kExcludeApiListsOption = "--exclude-api-lists=";
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struct VeridexOptions {
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const char* dex_file = nullptr;
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const char* core_stubs = nullptr;
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const char* flags_file = nullptr;
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bool precise = true;
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int target_sdk_version = 29; /* Q */
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std::vector<std::string> app_class_name_filter;
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std::vector<std::string> exclude_api_lists;
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};
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static const char* Substr(const char* str, int index) {
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return str + index;
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}
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static bool StartsWith(const char* str, const char* val) {
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return strlen(str) >= strlen(val) && memcmp(str, val, strlen(val)) == 0;
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}
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static void ParseArgs(VeridexOptions* options, int argc, char** argv) {
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// Skip over the command name.
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argv++;
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argc--;
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for (int i = 0; i < argc; ++i) {
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if (StartsWith(argv[i], kDexFileOption)) {
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options->dex_file = Substr(argv[i], strlen(kDexFileOption));
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} else if (StartsWith(argv[i], kStubsOption)) {
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options->core_stubs = Substr(argv[i], strlen(kStubsOption));
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} else if (StartsWith(argv[i], kFlagsOption)) {
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options->flags_file = Substr(argv[i], strlen(kFlagsOption));
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} else if (strcmp(argv[i], kImprecise) == 0) {
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options->precise = false;
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} else if (StartsWith(argv[i], kTargetSdkVersion)) {
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options->target_sdk_version = atoi(Substr(argv[i], strlen(kTargetSdkVersion)));
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} else if (StartsWith(argv[i], kAppClassFilter)) {
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options->app_class_name_filter = android::base::Split(
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Substr(argv[i], strlen(kAppClassFilter)), ",");
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} else if (StartsWith(argv[i], kExcludeApiListsOption)) {
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options->exclude_api_lists = android::base::Split(
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Substr(argv[i], strlen(kExcludeApiListsOption)), ",");
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} else {
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LOG(ERROR) << "Unknown command line argument: " << argv[i];
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}
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}
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}
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static std::vector<std::string> Split(const std::string& str, char sep) {
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std::vector<std::string> tokens;
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std::string tmp;
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std::istringstream iss(str);
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while (std::getline(iss, tmp, sep)) {
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tokens.push_back(tmp);
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}
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return tokens;
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}
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class Veridex {
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public:
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static int Run(int argc, char** argv) {
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VeridexOptions options;
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ParseArgs(&options, argc, argv);
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android::base::InitLogging(argv);
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if (!options.dex_file) {
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LOG(ERROR) << "Required argument '" << kDexFileOption << "' not provided.";
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return 1;
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}
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gTargetSdkVersion = options.target_sdk_version;
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std::vector<std::string> boot_content;
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std::vector<std::string> app_content;
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std::vector<std::unique_ptr<const DexFile>> boot_dex_files;
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std::vector<std::unique_ptr<const DexFile>> app_dex_files;
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std::string error_msg;
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// Read the boot classpath.
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std::vector<std::string> boot_classpath = Split(options.core_stubs, ':');
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boot_content.resize(boot_classpath.size());
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uint32_t i = 0;
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for (const std::string& str : boot_classpath) {
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if (!Load(str, boot_content[i++], &boot_dex_files, &error_msg)) {
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LOG(ERROR) << error_msg;
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return 1;
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}
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}
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// Read the apps dex files.
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std::vector<std::string> app_files = Split(options.dex_file, ':');
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app_content.resize(app_files.size());
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i = 0;
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for (const std::string& str : app_files) {
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if (!Load(str, app_content[i++], &app_dex_files, &error_msg)) {
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LOG(ERROR) << error_msg;
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return 1;
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}
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}
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// Resolve classes/methods/fields defined in each dex file.
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ApiListFilter api_list_filter(options.exclude_api_lists);
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HiddenApi hidden_api(options.flags_file, api_list_filter);
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// Cache of types we've seen, for quick class name lookups.
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TypeMap type_map;
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// Add internally defined primitives.
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type_map["Z"] = VeriClass::boolean_;
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type_map["B"] = VeriClass::byte_;
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type_map["S"] = VeriClass::short_;
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type_map["C"] = VeriClass::char_;
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type_map["I"] = VeriClass::integer_;
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type_map["F"] = VeriClass::float_;
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type_map["D"] = VeriClass::double_;
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type_map["J"] = VeriClass::long_;
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type_map["V"] = VeriClass::void_;
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// Cache of resolvers, to easily query address in memory to VeridexResolver.
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DexResolverMap resolver_map;
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std::vector<std::unique_ptr<VeridexResolver>> boot_resolvers;
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Resolve(boot_dex_files, resolver_map, type_map, &boot_resolvers);
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for (const auto &it : type_map) {
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hidden_api.AddSignatureSource(it.first, SignatureSource::BOOT);
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}
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if (options.precise) {
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// For precise mode we expect core-stubs to contain java.lang classes.
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VeriClass::object_ = type_map["Ljava/lang/Object;"];
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VeriClass::class_ = type_map["Ljava/lang/Class;"];
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VeriClass::class_loader_ = type_map["Ljava/lang/ClassLoader;"];
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VeriClass::string_ = type_map["Ljava/lang/String;"];
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VeriClass::throwable_ = type_map["Ljava/lang/Throwable;"];
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VeriClass::forName_ = boot_resolvers[0]->LookupDeclaredMethodIn(
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*VeriClass::class_, "forName", "(Ljava/lang/String;)Ljava/lang/Class;");
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VeriClass::getField_ = boot_resolvers[0]->LookupDeclaredMethodIn(
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*VeriClass::class_, "getField", "(Ljava/lang/String;)Ljava/lang/reflect/Field;");
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VeriClass::getDeclaredField_ = boot_resolvers[0]->LookupDeclaredMethodIn(
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*VeriClass::class_, "getDeclaredField", "(Ljava/lang/String;)Ljava/lang/reflect/Field;");
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VeriClass::getMethod_ = boot_resolvers[0]->LookupDeclaredMethodIn(
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*VeriClass::class_,
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"getMethod",
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"(Ljava/lang/String;[Ljava/lang/Class;)Ljava/lang/reflect/Method;");
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VeriClass::getDeclaredMethod_ = boot_resolvers[0]->LookupDeclaredMethodIn(
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*VeriClass::class_,
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"getDeclaredMethod",
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"(Ljava/lang/String;[Ljava/lang/Class;)Ljava/lang/reflect/Method;");
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VeriClass::getClass_ = boot_resolvers[0]->LookupDeclaredMethodIn(
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*VeriClass::object_, "getClass", "()Ljava/lang/Class;");
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VeriClass::loadClass_ = boot_resolvers[0]->LookupDeclaredMethodIn(
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*VeriClass::class_loader_, "loadClass", "(Ljava/lang/String;)Ljava/lang/Class;");
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VeriClass* version = type_map["Landroid/os/Build$VERSION;"];
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if (version != nullptr) {
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VeriClass::sdkInt_ = boot_resolvers[0]->LookupFieldIn(*version, "SDK_INT", "I");
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}
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}
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std::vector<std::unique_ptr<VeridexResolver>> app_resolvers;
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Resolve(app_dex_files, resolver_map, type_map, &app_resolvers);
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for (const auto &it : type_map) {
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if (!hidden_api.IsInBoot(it.first)) {
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hidden_api.AddSignatureSource(it.first, SignatureSource::APP);
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}
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}
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ClassFilter app_class_filter(options.app_class_name_filter);
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// Find and log uses of hidden APIs.
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HiddenApiStats stats;
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HiddenApiFinder api_finder(hidden_api);
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api_finder.Run(app_resolvers, app_class_filter);
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api_finder.Dump(std::cout, &stats, !options.precise);
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if (options.precise) {
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PreciseHiddenApiFinder precise_api_finder(hidden_api);
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precise_api_finder.Run(app_resolvers, app_class_filter);
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precise_api_finder.Dump(std::cout, &stats);
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}
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DumpSummaryStats(std::cout, stats, api_list_filter);
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if (options.precise) {
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std::cout << "To run an analysis that can give more reflection accesses, " << std::endl
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<< "but could include false positives, pass the --imprecise flag. " << std::endl;
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}
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return 0;
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}
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private:
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static void DumpSummaryStats(std::ostream& os,
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const HiddenApiStats& stats,
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const ApiListFilter& api_list_filter) {
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os << stats.count << " hidden API(s) used: "
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<< stats.linking_count << " linked against, "
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<< stats.reflection_count << " through reflection" << std::endl;
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DumpApiListStats(os, stats, hiddenapi::ApiList(), api_list_filter);
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for (size_t i = 0; i < hiddenapi::ApiList::kValueCount; ++i) {
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DumpApiListStats(os, stats, hiddenapi::ApiList(i), api_list_filter);
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}
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}
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static void DumpApiListStats(std::ostream& os,
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const HiddenApiStats& stats,
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const hiddenapi::ApiList& api_list,
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const ApiListFilter& api_list_filter) {
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if (api_list_filter.Matches(api_list)) {
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os << "\t" << stats.api_counts[api_list.GetIntValue()] << " in " << api_list << std::endl;
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}
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}
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static bool Load(const std::string& filename,
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std::string& content,
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std::vector<std::unique_ptr<const DexFile>>* dex_files,
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std::string* error_msg) {
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if (filename.empty()) {
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*error_msg = "Missing file name";
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return false;
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}
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// TODO: once added, use an api to android::base to read a std::vector<uint8_t>.
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if (!android::base::ReadFileToString(filename.c_str(), &content)) {
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*error_msg = "ReadFileToString failed for " + filename;
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return false;
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}
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const DexFileLoader dex_file_loader;
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DexFileLoaderErrorCode error_code;
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static constexpr bool kVerifyChecksum = true;
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static constexpr bool kRunDexFileVerifier = true;
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if (!dex_file_loader.OpenAll(reinterpret_cast<const uint8_t*>(content.data()),
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content.size(),
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filename.c_str(),
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kRunDexFileVerifier,
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kVerifyChecksum,
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&error_code,
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error_msg,
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dex_files)) {
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if (error_code == DexFileLoaderErrorCode::kEntryNotFound) {
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LOG(INFO) << "No .dex found, skipping analysis.";
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return true;
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}
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return false;
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}
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return true;
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}
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static void Resolve(const std::vector<std::unique_ptr<const DexFile>>& dex_files,
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DexResolverMap& resolver_map,
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TypeMap& type_map,
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std::vector<std::unique_ptr<VeridexResolver>>* resolvers) {
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for (const std::unique_ptr<const DexFile>& dex_file : dex_files) {
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VeridexResolver* resolver =
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new VeridexResolver(*dex_file.get(), resolver_map, type_map);
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resolvers->emplace_back(resolver);
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resolver_map[reinterpret_cast<uintptr_t>(dex_file->Begin())] = resolver;
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}
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for (const std::unique_ptr<VeridexResolver>& resolver : *resolvers) {
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resolver->Run();
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}
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}
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};
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} // namespace art
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int main(int argc, char** argv) {
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return art::Veridex::Run(argc, argv);
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}
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