tools/veridex/hidden_api_finder.cc - platform/art - Git at Google

 /*
  * Copyright (C) 2018 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #include "hidden_api_finder.h"

 #include "dex/code_item_accessors-inl.h"
 #include "dex/dex_instruction-inl.h"
 #include "dex/dex_file.h"
 #include "dex/method_reference.h"
 #include "hidden_api.h"
 #include "resolver.h"
 #include "veridex.h"

 #include <iostream>

 namespace art {

 void HiddenApiFinder::CheckMethod(uint32_t method_id,
                                   VeridexResolver* resolver,
                                   MethodReference ref) {
   // Note: we always query whether a method is in a list, as the app
   // might define blacklisted APIs (which won't be used at runtime).
   std::string name = HiddenApi::GetApiMethodName(resolver->GetDexFile(), method_id);
   if (hidden_api_.IsInRestrictionList(name)) {
     method_locations_[name].push_back(ref);
   }
 }

 void HiddenApiFinder::CheckField(uint32_t field_id,
                                  VeridexResolver* resolver,
                                  MethodReference ref) {
   // Note: we always query whether a field is in a list, as the app
   // might define blacklisted APIs (which won't be used at runtime).
   std::string name = HiddenApi::GetApiFieldName(resolver->GetDexFile(), field_id);
   if (hidden_api_.IsInRestrictionList(name)) {
     field_locations_[name].push_back(ref);
   }
 }

 void HiddenApiFinder::CollectAccesses(VeridexResolver* resolver) {
   const DexFile& dex_file = resolver->GetDexFile();
   // Look at all types referenced in this dex file. Any of these
   // types can lead to being used through reflection.
   for (uint32_t i = 0; i < dex_file.NumTypeIds(); ++i) {
     std::string name(dex_file.StringByTypeIdx(dex::TypeIndex(i)));
     if (hidden_api_.IsInRestrictionList(name)) {
       classes_.insert(name);
     }
   }
   // Note: we collect strings constants only referenced in code items as the string table
   // contains other kind of strings (eg types).
   size_t class_def_count = dex_file.NumClassDefs();
   for (size_t class_def_index = 0; class_def_index < class_def_count; ++class_def_index) {
     const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_index);
     const uint8_t* class_data = dex_file.GetClassData(class_def);
     if (class_data == nullptr) {
       // Empty class.
       continue;
     }
     ClassDataItemIterator it(dex_file, class_data);
     it.SkipAllFields();
     for (; it.HasNextMethod(); it.Next()) {
       const DexFile::CodeItem* code_item = it.GetMethodCodeItem();
       if (code_item == nullptr) {
         continue;
       }
       CodeItemDataAccessor code_item_accessor(dex_file, code_item);
       for (const DexInstructionPcPair& inst : code_item_accessor) {
         switch (inst->Opcode()) {
           case Instruction::CONST_STRING: {
             dex::StringIndex string_index(inst->VRegB_21c());
             std::string name = std::string(dex_file.StringDataByIdx(string_index));
             // Cheap filtering on the string literal. We know it cannot be a field/method/class
             // if it contains a space.
             if (name.find(' ') == std::string::npos) {
               // Class names at the Java level are of the form x.y.z, but the list encodes
               // them of the form Lx/y/z;. Inner classes have '$' for both Java level class
               // names in strings, and hidden API lists.
               std::string str = HiddenApi::ToInternalName(name);
               // Note: we can query the lists directly, as HiddenApi added classes that own
               // private methods and fields in them.
               // We don't add class names to the `strings_` set as we know method/field names
               // don't have '.' or '/'. All hidden API class names have a '/'.
               if (hidden_api_.IsInRestrictionList(str)) {
                 classes_.insert(str);
               } else if (hidden_api_.IsInRestrictionList(name)) {
                 // Could be something passed to JNI.
                 classes_.insert(name);
               } else {
                 // We only keep track of the location for strings, as these will be the
                 // field/method names the user is interested in.
                 strings_.insert(name);
                 reflection_locations_[name].push_back(
                     MethodReference(&dex_file, it.GetMemberIndex()));
               }
             }
             break;
           }
           case Instruction::INVOKE_DIRECT:
           case Instruction::INVOKE_INTERFACE:
           case Instruction::INVOKE_STATIC:
           case Instruction::INVOKE_SUPER:
           case Instruction::INVOKE_VIRTUAL: {
             CheckMethod(
                 inst->VRegB_35c(), resolver, MethodReference(&dex_file, it.GetMemberIndex()));
             break;
           }

           case Instruction::INVOKE_DIRECT_RANGE:
           case Instruction::INVOKE_INTERFACE_RANGE:
           case Instruction::INVOKE_STATIC_RANGE:
           case Instruction::INVOKE_SUPER_RANGE:
           case Instruction::INVOKE_VIRTUAL_RANGE: {
             CheckMethod(
                 inst->VRegB_3rc(), resolver, MethodReference(&dex_file, it.GetMemberIndex()));
             break;
           }

           case Instruction::IGET:
           case Instruction::IGET_WIDE:
           case Instruction::IGET_OBJECT:
           case Instruction::IGET_BOOLEAN:
           case Instruction::IGET_BYTE:
           case Instruction::IGET_CHAR:
           case Instruction::IGET_SHORT: {
             CheckField(
                 inst->VRegC_22c(), resolver, MethodReference(&dex_file, it.GetMemberIndex()));
             break;
           }

           case Instruction::IPUT:
           case Instruction::IPUT_WIDE:
           case Instruction::IPUT_OBJECT:
           case Instruction::IPUT_BOOLEAN:
           case Instruction::IPUT_BYTE:
           case Instruction::IPUT_CHAR:
           case Instruction::IPUT_SHORT: {
             CheckField(
                 inst->VRegC_22c(), resolver, MethodReference(&dex_file, it.GetMemberIndex()));
             break;
           }

           case Instruction::SGET:
           case Instruction::SGET_WIDE:
           case Instruction::SGET_OBJECT:
           case Instruction::SGET_BOOLEAN:
           case Instruction::SGET_BYTE:
           case Instruction::SGET_CHAR:
           case Instruction::SGET_SHORT: {
             CheckField(
                 inst->VRegB_21c(), resolver, MethodReference(&dex_file, it.GetMemberIndex()));
             break;
           }

           case Instruction::SPUT:
           case Instruction::SPUT_WIDE:
           case Instruction::SPUT_OBJECT:
           case Instruction::SPUT_BOOLEAN:
           case Instruction::SPUT_BYTE:
           case Instruction::SPUT_CHAR:
           case Instruction::SPUT_SHORT: {
             CheckField(
                 inst->VRegB_21c(), resolver, MethodReference(&dex_file, it.GetMemberIndex()));
             break;
           }

           default:
             break;
         }
       }
     }
   }
 }

 void HiddenApiFinder::Run(const std::vector<std::unique_ptr<VeridexResolver>>& resolvers) {
   for (const std::unique_ptr<VeridexResolver>& resolver : resolvers) {
     CollectAccesses(resolver.get());
   }
 }

 void HiddenApiFinder::Dump(std::ostream& os,
                            HiddenApiStats* stats,
                            bool dump_reflection) {
   static const char* kPrefix = "       ";
   stats->linking_count = method_locations_.size() + field_locations_.size();

   // Dump methods from hidden APIs linked against.
   for (const std::pair<std::string, std::vector<MethodReference>>& pair : method_locations_) {
     HiddenApiAccessFlags::ApiList api_list = hidden_api_.GetApiList(pair.first);
     stats->api_counts[api_list]++;
     os << "#" << ++stats->count << ": Linking " << api_list << " " << pair.first << " use(s):";
     os << std::endl;
     for (const MethodReference& ref : pair.second) {
       os << kPrefix << HiddenApi::GetApiMethodName(ref) << std::endl;
     }
     os << std::endl;
   }

   // Dump fields from hidden APIs linked against.
   for (const std::pair<std::string, std::vector<MethodReference>>& pair : field_locations_) {
     HiddenApiAccessFlags::ApiList api_list = hidden_api_.GetApiList(pair.first);
     stats->api_counts[api_list]++;
     os << "#" << ++stats->count << ": Linking " << api_list << " " << pair.first << " use(s):";
     os << std::endl;
     for (const MethodReference& ref : pair.second) {
       os << kPrefix << HiddenApi::GetApiMethodName(ref) << std::endl;
     }
     os << std::endl;
   }

   if (dump_reflection) {
     // Dump potential reflection uses.
     for (const std::string& cls : classes_) {
       for (const std::string& name : strings_) {
         std::string full_name = cls + "->" + name;
         HiddenApiAccessFlags::ApiList api_list = hidden_api_.GetApiList(full_name);
         stats->api_counts[api_list]++;
         if (api_list != HiddenApiAccessFlags::kWhitelist) {
           stats->reflection_count++;
           os << "#" << ++stats->count << ": Reflection " << api_list << " " << full_name
              << " potential use(s):";
           os << std::endl;
           for (const MethodReference& ref : reflection_locations_[name]) {
             os << kPrefix << HiddenApi::GetApiMethodName(ref) << std::endl;
           }
           os << std::endl;
         }
       }
     }
   }
 }

 }  // namespace art
	/*
	* Copyright (C) 2018 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#include "hidden_api_finder.h"

	#include "dex/code_item_accessors-inl.h"
	#include "dex/dex_instruction-inl.h"
	#include "dex/dex_file.h"
	#include "dex/method_reference.h"
	#include "hidden_api.h"
	#include "resolver.h"
	#include "veridex.h"

	#include <iostream>

	namespace art {

	void HiddenApiFinder::CheckMethod(uint32_t method_id,
	VeridexResolver* resolver,
	MethodReference ref) {
	// Note: we always query whether a method is in a list, as the app
	// might define blacklisted APIs (which won't be used at runtime).
	std::string name = HiddenApi::GetApiMethodName(resolver->GetDexFile(), method_id);
	if (hidden_api_.IsInRestrictionList(name)) {
	method_locations_[name].push_back(ref);
	}
	}

	void HiddenApiFinder::CheckField(uint32_t field_id,
	VeridexResolver* resolver,
	MethodReference ref) {
	// Note: we always query whether a field is in a list, as the app
	// might define blacklisted APIs (which won't be used at runtime).
	std::string name = HiddenApi::GetApiFieldName(resolver->GetDexFile(), field_id);
	if (hidden_api_.IsInRestrictionList(name)) {
	field_locations_[name].push_back(ref);
	}
	}

	void HiddenApiFinder::CollectAccesses(VeridexResolver* resolver) {
	const DexFile& dex_file = resolver->GetDexFile();
	// Look at all types referenced in this dex file. Any of these
	// types can lead to being used through reflection.
	for (uint32_t i = 0; i < dex_file.NumTypeIds(); ++i) {
	std::string name(dex_file.StringByTypeIdx(dex::TypeIndex(i)));
	if (hidden_api_.IsInRestrictionList(name)) {
	classes_.insert(name);
	}
	}
	// Note: we collect strings constants only referenced in code items as the string table
	// contains other kind of strings (eg types).
	size_t class_def_count = dex_file.NumClassDefs();
	for (size_t class_def_index = 0; class_def_index < class_def_count; ++class_def_index) {
	const DexFile::ClassDef& class_def = dex_file.GetClassDef(class_def_index);
	const uint8_t* class_data = dex_file.GetClassData(class_def);
	if (class_data == nullptr) {
	// Empty class.
	continue;
	}
	ClassDataItemIterator it(dex_file, class_data);
	it.SkipAllFields();
	for (; it.HasNextMethod(); it.Next()) {
	const DexFile::CodeItem* code_item = it.GetMethodCodeItem();
	if (code_item == nullptr) {
	continue;
	}
	CodeItemDataAccessor code_item_accessor(dex_file, code_item);
	for (const DexInstructionPcPair& inst : code_item_accessor) {
	switch (inst->Opcode()) {
	case Instruction::CONST_STRING: {
	dex::StringIndex string_index(inst->VRegB_21c());
	std::string name = std::string(dex_file.StringDataByIdx(string_index));
	// Cheap filtering on the string literal. We know it cannot be a field/method/class
	// if it contains a space.
	if (name.find(' ') == std::string::npos) {
	// Class names at the Java level are of the form x.y.z, but the list encodes
	// them of the form Lx/y/z;. Inner classes have '$' for both Java level class
	// names in strings, and hidden API lists.
	std::string str = HiddenApi::ToInternalName(name);
	// Note: we can query the lists directly, as HiddenApi added classes that own
	// private methods and fields in them.
	// We don't add class names to the `strings_` set as we know method/field names
	// don't have '.' or '/'. All hidden API class names have a '/'.
	if (hidden_api_.IsInRestrictionList(str)) {
	classes_.insert(str);
	} else if (hidden_api_.IsInRestrictionList(name)) {
	// Could be something passed to JNI.
	classes_.insert(name);
	} else {
	// We only keep track of the location for strings, as these will be the
	// field/method names the user is interested in.
	strings_.insert(name);
	reflection_locations_[name].push_back(
	MethodReference(&dex_file, it.GetMemberIndex()));
	}
	}
	break;
	}
	case Instruction::INVOKE_DIRECT:
	case Instruction::INVOKE_INTERFACE:
	case Instruction::INVOKE_STATIC:
	case Instruction::INVOKE_SUPER:
	case Instruction::INVOKE_VIRTUAL: {
	CheckMethod(
	inst->VRegB_35c(), resolver, MethodReference(&dex_file, it.GetMemberIndex()));
	break;
	}

	case Instruction::INVOKE_DIRECT_RANGE:
	case Instruction::INVOKE_INTERFACE_RANGE:
	case Instruction::INVOKE_STATIC_RANGE:
	case Instruction::INVOKE_SUPER_RANGE:
	case Instruction::INVOKE_VIRTUAL_RANGE: {
	CheckMethod(
	inst->VRegB_3rc(), resolver, MethodReference(&dex_file, it.GetMemberIndex()));
	break;
	}

	case Instruction::IGET:
	case Instruction::IGET_WIDE:
	case Instruction::IGET_OBJECT:
	case Instruction::IGET_BOOLEAN:
	case Instruction::IGET_BYTE:
	case Instruction::IGET_CHAR:
	case Instruction::IGET_SHORT: {
	CheckField(
	inst->VRegC_22c(), resolver, MethodReference(&dex_file, it.GetMemberIndex()));
	break;
	}

	case Instruction::IPUT:
	case Instruction::IPUT_WIDE:
	case Instruction::IPUT_OBJECT:
	case Instruction::IPUT_BOOLEAN:
	case Instruction::IPUT_BYTE:
	case Instruction::IPUT_CHAR:
	case Instruction::IPUT_SHORT: {
	CheckField(
	inst->VRegC_22c(), resolver, MethodReference(&dex_file, it.GetMemberIndex()));
	break;
	}

	case Instruction::SGET:
	case Instruction::SGET_WIDE:
	case Instruction::SGET_OBJECT:
	case Instruction::SGET_BOOLEAN:
	case Instruction::SGET_BYTE:
	case Instruction::SGET_CHAR:
	case Instruction::SGET_SHORT: {
	CheckField(
	inst->VRegB_21c(), resolver, MethodReference(&dex_file, it.GetMemberIndex()));
	break;
	}

	case Instruction::SPUT:
	case Instruction::SPUT_WIDE:
	case Instruction::SPUT_OBJECT:
	case Instruction::SPUT_BOOLEAN:
	case Instruction::SPUT_BYTE:
	case Instruction::SPUT_CHAR:
	case Instruction::SPUT_SHORT: {
	CheckField(
	inst->VRegB_21c(), resolver, MethodReference(&dex_file, it.GetMemberIndex()));
	break;
	}

	default:
	break;
	}
	}
	}
	}
	}

	void HiddenApiFinder::Run(const std::vector<std::unique_ptr<VeridexResolver>>& resolvers) {
	for (const std::unique_ptr<VeridexResolver>& resolver : resolvers) {
	CollectAccesses(resolver.get());
	}
	}

	void HiddenApiFinder::Dump(std::ostream& os,
	HiddenApiStats* stats,
	bool dump_reflection) {
	static const char* kPrefix = " ";
	stats->linking_count = method_locations_.size() + field_locations_.size();

	// Dump methods from hidden APIs linked against.
	for (const std::pair<std::string, std::vector<MethodReference>>& pair : method_locations_) {
	HiddenApiAccessFlags::ApiList api_list = hidden_api_.GetApiList(pair.first);
	stats->api_counts[api_list]++;
	os << "#" << ++stats->count << ": Linking " << api_list << " " << pair.first << " use(s):";
	os << std::endl;
	for (const MethodReference& ref : pair.second) {
	os << kPrefix << HiddenApi::GetApiMethodName(ref) << std::endl;
	}
	os << std::endl;
	}

	// Dump fields from hidden APIs linked against.
	for (const std::pair<std::string, std::vector<MethodReference>>& pair : field_locations_) {
	HiddenApiAccessFlags::ApiList api_list = hidden_api_.GetApiList(pair.first);
	stats->api_counts[api_list]++;
	os << "#" << ++stats->count << ": Linking " << api_list << " " << pair.first << " use(s):";
	os << std::endl;
	for (const MethodReference& ref : pair.second) {
	os << kPrefix << HiddenApi::GetApiMethodName(ref) << std::endl;
	}
	os << std::endl;
	}

	if (dump_reflection) {
	// Dump potential reflection uses.
	for (const std::string& cls : classes_) {
	for (const std::string& name : strings_) {
	std::string full_name = cls + "->" + name;
	HiddenApiAccessFlags::ApiList api_list = hidden_api_.GetApiList(full_name);
	stats->api_counts[api_list]++;
	if (api_list != HiddenApiAccessFlags::kWhitelist) {
	stats->reflection_count++;
	os << "#" << ++stats->count << ": Reflection " << api_list << " " << full_name
	<< " potential use(s):";
	os << std::endl;
	for (const MethodReference& ref : reflection_locations_[name]) {
	os << kPrefix << HiddenApi::GetApiMethodName(ref) << std::endl;
	}
	os << std::endl;
	}
	}
	}
	}
	}

	} // namespace art