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Basis of AndroidNativeEmu

Basis of AndroidNativeEmu

作者: HAPPYers | 来源:发表于2019-10-01 16:12 被阅读0次

    安装使用

    环境要求: python 3.7 (注意必须是3.7版本, 使用3.6装keystone的时候踩了坑)

    git clone https://github.com/AeonLucid/AndroidNativeEmu.git
pip install -r requirements.txt

    安装keystone-engine可能会失败

    解决方案

    1. 克隆keystone仓库:
    git clone https://github.com/keystone-engine/keystone.git
    1. 打开keystone\bindings文件夹安装:
    python setup.py install
    1. 下载对应系统和版本dll(因为我是win), 下载链接: http://www.keystone-engine.org/download/
    2. 把dll复制到python的keystone目录下: [python_path]\Lib\site-packages\keystone\

    然后把sample文件夹里面的example.py拷贝到上一层目录

    python example.py

    运行结果

    λ python example.py
2019-10-01 13:26:19,404   DEBUG        androidemu.internal.modules | Loading module 'samples/example_binaries/libc.so'.
2019-10-01 13:26:19,409   DEBUG         androidemu.internal.memory | => Mapping memory page 0xcbbcb000 - 0xcbc57000, size 0x0008c000, prot 5
2019-10-01 13:26:19,410   DEBUG         androidemu.internal.memory | => Mapping memory page 0xcbc58000 - 0xcbc66000, size 0x0000e000, prot 3
2019-10-01 13:26:19,417   ERROR        androidemu.internal.modules | => Undefined external symbol: dlerror
2019-10-01 13:26:19,417   ERROR        androidemu.internal.modules | => Undefined external symbol: dlclose
2019-10-01 13:26:19,418   ERROR        androidemu.internal.modules | => Undefined external symbol: android_get_application_target_sdk_version
2019-10-01 13:26:19,418   ERROR        androidemu.internal.modules | => Undefined external symbol: dl_unwind_find_exidx
2019-10-01 13:26:20,023   ERROR        androidemu.internal.modules | => Undefined external symbol: dlerror
2019-10-01 13:26:20,023   ERROR        androidemu.internal.modules | => Undefined external symbol: dlclose
2019-10-01 13:26:20,026   ERROR        androidemu.internal.modules | => Undefined external symbol: android_get_application_target_sdk_version
2019-10-01 13:26:20,027   ERROR        androidemu.internal.modules | => Undefined external symbol: dl_unwind_find_exidx
2019-10-01 13:26:20,326   DEBUG        androidemu.internal.modules | Loading module 'samples/example_binaries/libnative-lib.so'.
2019-10-01 13:26:20,330   DEBUG         androidemu.internal.memory | => Mapping memory page 0xcbc66000 - 0xcbc69000, size 0x00003000, prot 5
2019-10-01 13:26:20,330   DEBUG         androidemu.internal.memory | => Mapping memory page 0xcbc69000 - 0xcbc6b000, size 0x00002000, prot 3
2019-10-01 13:26:20,340    INFO                           __main__ | Loaded modules:
2019-10-01 13:26:20,340    INFO                           __main__ | [0xcbbcb000] samples/example_binaries/libc.so
2019-10-01 13:26:20,341    INFO                           __main__ | [0xcbc66000] samples/example_binaries/libnative-lib.so
# Tracing instruction at 0xcbc667c4, instruction size = 0x2, instruction = 80 b5
# Tracing instruction at 0xcbc667c6, instruction size = 0x2, instruction = 6f 46
# Tracing instruction at 0xcbc667c8, instruction size = 0x2, instruction = 82 b0
# Tracing instruction at 0xcbc667ca, instruction size = 0x2, instruction = 04 48
# Tracing instruction at 0xcbc667cc, instruction size = 0x2, instruction = 78 44
...
# Tracing instruction at 0xcbbe567a, instruction size = 0x2, instruction = 80 1e
# Tracing instruction at 0xcbbe567c, instruction size = 0x2, instruction = 70 47
# Tracing instruction at 0xcbc667d6, instruction size = 0x2, instruction = 02 b0
# Tracing instruction at 0xcbc667d8, instruction size = 0x2, instruction = 80 bd
String length is: 26

    示例文件分析

    example_binaries/ : 里面是需要加载的so
    vfs/ : 里面是虚拟的文件系统, 有需要可以自己添加文件
    androidemu/ : android虚拟机

    import logging
import sys
 
from unicorn import UC_HOOK_CODE
from unicorn.arm_const import *
 
from androidemu.emulator import Emulator
 
# 配置日志相关设置
logging.basicConfig(
    stream=sys.stdout, #标准输出流
    level=logging.DEBUG, #输出等级
    format="%(asctime)s %(levelname)7s %(name)34s | %(message)s" #输出格式
)
 
logger = logging.getLogger(__name__) #实例化对象
 
# 实例化虚拟机
emulator = Emulator()
 
#加载Libc库
emulator.load_library("example_binaries/libc.so", do_init=False)
 
#加载要模拟器的库
lib_module = emulator.load_library("example_binaries/libnative-lib.so")
 
#打印已经加载的模块
logger.info("Loaded modules:")
for module in emulator.modules:
    logger.info("[0x%x] %s" % (module.base, module.filename))
 
 
#trace 每步执行的指令, 方便调试, 其实也可以取消
def hook_code(mu, address, size, user_data):
    instruction = mu.mem_read(address, size)
    instruction_str = ''.join('{:02x} '.format(x) for x in instruction)
    print('# Tracing instruction at 0x%x, instruction size = 0x%x, instruction = %s' % (address, size, instruction_str))
emulator.mu.hook_add(UC_HOOK_CODE, hook_code)
 
 
#通过导出符号来调用函数
emulator.call_symbol(lib_module, '_Z4testv')
 
#通过R0来获取调用结构
print("String length is: %i" % emulator.mu.reg_read(UC_ARM_REG_R0)).

    目录及用法介绍

    androidemu目录下

    • utils/memory_helpers.py为内存读写的工具，包括read_ptr,read_utf8,write_utf8,write_uints,hex_dump等函数
    • pu/syscall_hooks.py包括了各种系统调用的实现(HOOK)
     def __init__(self, mu, syscall_handler):
        self._mu = mu
        self._syscall_handler = syscall_handler
        self._syscall_handler.set_handler(0x4E, "gettimeofday", 2, self._handle_gettimeofday)
        self._syscall_handler.set_handler(0xAC, "prctl", 5, self._handle_prctl)
        self._syscall_handler.set_handler(0xF0, "futex", 6, self._handle_futex)
        self._syscall_handler.set_handler(0x107, "clock_gettime", 2, self._handle_clock_gettime)
        self._syscall_handler.set_handler(0x119, "socket", 3, self._socket)
        self._syscall_handler.set_handler(0x11b, "connect", 3, self._connect)
        self._syscall_handler.set_handler(0x159, "getcpu", 3, self._getcpu)
        self._syscall_handler.set_handler(0x14e, "faccessat", 4, self._faccessat)
        self._syscall_handler.set_handler(0x14, "getpid", 0, self._getpid)
        self._syscall_handler.set_handler(0xe0, "gettid", 0, self._gettid)
        self._syscall_handler.set_handler(0x180,"null1",0, self._null)
        self._clock_start = time.time()
        self._clock_offset = randint(1000, 2000)

    我们也可以添加自己的系统调用进去，系统调用号可以在unistd.h查到。

    自写Demo测试

    demo工程

    JNIEXPORT int nativeAdd(int a, int b) {
    return a + b;
}

extern "C"
JNIEXPORT int wrap_getpid() {
    return getpid();
}

extern "C" JNIEXPORT jstring JNICALL
Java_com_happy_emusotest_MainActivity_stringFromJNI(
        JNIEnv *env,
        jobject /* this */) {
    std::string hello = "Hello from C++";
    int c = nativeAdd(2, 3) + wrap_getpid();
    c++;
    return env->NewStringUTF(hello.c_str());
}

    emu代码

    import logging
import posixpath
import sys
 
from unicorn import UcError, UC_HOOK_CODE, UC_HOOK_MEM_UNMAPPED
from unicorn.arm_const import *
 
from androidemu.emulator import Emulator
 
import debug_utils
 
 
# 配置日志
logging.basicConfig(
    stream=sys.stdout,
    level=logging.DEBUG,
    format="%(asctime)s %(levelname)7s %(name)34s | %(message)s"
)
 
logger = logging.getLogger(__name__)
 
# 初始化模拟器
emulator = Emulator(
    vfp_inst_set=True,
    vfs_root=posixpath.join(posixpath.dirname(__file__), "vfs")
)
 
 
# 加载依赖的动态库
emulator.load_library("example_binaries/libdl.so")
emulator.load_library("example_binaries/libc.so", do_init=False)
emulator.load_library("example_binaries/libstdc++.so")
emulator.load_library("example_binaries/libm.so")
lib_module = emulator.load_library("example_binaries/libmytest.so")
 
# 当前已经load的so
logger.info("Loaded modules:")
 
for module in emulator.modules:
    logger.info("=> 0x%08x - %s" % (module.base, module.filename))
 
 
 
try:
    # 运行jni onload 这里没有, 但不影响执行
    emulator.call_symbol(lib_module, 'JNI_OnLoad', emulator.java_vm.address_ptr, 0x00)
 
 
    #直接调用符号1, 计算1+2
    emulator.call_symbol(lib_module, '_Z9nativeAddii', 1, 2)
    print("_Z9nativeAddii result call: %i" % emulator.mu.reg_read(UC_ARM_REG_R0))
 
    #直接调用符号2, 计算1000 + 1000
    emulator.call_symbol(lib_module, 'Java_com_mario_testunicorn_MainActivity_myAdd', 0, 0, 1000, 1000)
    print("myAdd result call: %i" % emulator.mu.reg_read(UC_ARM_REG_R0))
 
    #执行完成, 退出虚拟机
    logger.info("Exited EMU.")
    logger.info("Native methods registered to MainActivity:")
 
except UcError as e:
    print("Exit at %x" % emulator.mu.reg_read(UC_ARM_REG_PC))
    raise

    RuntimeError: Unhandled syscall x (x) at 解决

    这个错误是因为没有实现对应syscall导致的, 缺少什么函数, 自己写一个函数绑定一下, 返回给他需要的值就可以了, 比如getpid, 那么自己写的函数随便返回一个整形就可以了

    在syscall_hooks.py文件里, 可以看到作者已经实现的函数

    self._syscall_handler.set_handler(0x4E, "gettimeofday", 2, self._handle_gettimeofday)
self._syscall_handler.set_handler(0xAC, "prctl", 5, self._handle_prctl)
self._syscall_handler.set_handler(0xF0, "futex", 6, self._handle_futex)
self._syscall_handler.set_handler(0x107, "clock_gettime", 2, self._handle_clock_gettime)
self._syscall_handler.set_handler(0x119, "socket", 3, self._socket)
self._syscall_handler.set_handler(0x11b, "connect", 3, self._connect)
self._syscall_handler.set_handler(0x159, "getcpu", 3, self._getcpu)
self._syscall_handler.set_handler(0x14e, "faccessat", 4, self._faccessat)
self._syscall_handler.set_handler(0x14, "getpid", 0, self._getpid)
self._syscall_handler.set_handler(0xe0, "gettid", 0, self._gettid)
self._syscall_handler.set_handler(0x180,"null1",0, self._null)

    set_handler函数参数:

        arg1: 中断号(intno),中断号可以在ndk中的unistd.h中找到
    arg2: 函数名
    arg3: 参数数量
    arg4: 绑定的自定义函数

    运行结果

    _binaries/libdl.so
2019-10-01 14:48:58,798    INFO                           __main__ | => 0xcbbd1000 - example_binaries/libc.so
2019-10-01 14:48:58,799    INFO                           __main__ | => 0xcbc6c000 - example_binaries/libstdc++.so
2019-10-01 14:48:58,800    INFO                           __main__ | => 0xcbc72000 - example_binaries/libm.so
2019-10-01 14:48:58,800    INFO                           __main__ | => 0xcbc95000 - example_binaries/test/libnative-lib.so
2019-10-01 14:48:58,800   ERROR                androidemu.emulator | Unable to find symbol 'JNI_OnLoad' in module 'example_binaries/test/libnative-lib.so'.
_Z9nativeAddii result call: 3
2019-10-01 14:48:58,801   DEBUG    androidemu.cpu.syscall_handlers | Executing syscall getpid() at 0xcbc1ab14
my wrap_getpid: 4386
2019-10-01 14:48:58,802    INFO                           __main__ | Exited EMU.
2019-10-01 14:48:58,802    INFO                           __main__ | Native methods registered to MainActivity:

    测试分控so

    这里的emu处理了字符串相关的函数hook
    目标：

    目标文件:  libtest.so
目标函数:  a(char* buf, int buf_len)
返回值: return_value > 0, 表示风险环境并且会在buf参数里写入详细风险环境信息;
        return_value == 0, 表示正常环境

    emu代码

    import logging
import posixpath
import sys
 
from unicorn import UcError, UC_HOOK_CODE, UC_HOOK_MEM_UNMAPPED
from unicorn.arm_const import *
 
from androidemu.emulator import Emulator
from androidemu.java.java_class_def import JavaClassDef
from androidemu.java.java_method_def import java_method_def
 
 
# Create java class.
import debug_utils
 
 
# 配置日志
logging.basicConfig(
    stream=sys.stdout,
    level=logging.DEBUG,
    format="%(asctime)s %(levelname)7s %(name)34s | %(message)s"
)
 
logger = logging.getLogger(__name__)
 
# 初始化模拟器
emulator = Emulator(
    vfp_inst_set=True,
    vfs_root=posixpath.join(posixpath.dirname(__file__), "vfs")
)
 
 
# 加载依赖的动态库
emulator.load_library("example_binaries/libdl.so")
emulator.load_library("example_binaries/libc.so", do_init=False)
emulator.load_library("example_binaries/libstdc++.so")
emulator.load_library("example_binaries/liblog.so")
emulator.load_library("example_binaries/libm.so")
#目标so
lib_module = emulator.load_library("example_binaries/libtest.so")
 
# 当前已经load的so
logger.info("Loaded modules:")
for module in emulator.modules:
    logger.info("=> 0x%08x - %s" % (module.base, module.filename))
 
 
 
try:
    # 运行jni onload 这里没有, 但不影响执行
    emulator.call_symbol(lib_module, 'JNI_OnLoad', emulator.java_vm.address_ptr, 0x00)
 
    # 增加properties, 该so或通过获取一些properties来判断环境
    emulator.system_properties['ro.build.fingerprint'] = 'google/passion/passion:2.3.3/GRI40/102588:user/release-keys'
    emulator.system_properties['ro.product.cpu.abi'] = 'arm'
    emulator.system_properties['microvirt.vbox_dpi'] = ''
 
    #申请一块buff, 用作参数
    emulator.call_symbol(lib_module, 'malloc', 0x1000)
    address = emulator.mu.reg_read(UC_ARM_REG_R0)
 
    #在之前申请的buff读取内存
    detect_str = memory_helpers.read_utf8(emulator.mu, address)
    print("detect_str: " + detect_str)
 
    #执行完成, 退出虚拟机
    logger.info("Exited EMU.")
    logger.info("Native methods registered to MainActivity:")
 
except UcError as e:
    print("Exit at %x" % emulator.mu.reg_read(UC_ARM_REG_PC))
    raise

    高级用法

    hook 类中函数

    import logging
import posixpath
import sys

from unicorn import UcError, UC_HOOK_CODE, UC_HOOK_MEM_UNMAPPED
from unicorn.arm_const import *

from androidemu.emulator import Emulator
from androidemu.java.java_class_def import JavaClassDef
from androidemu.java.java_method_def import java_method_def


# Create java class.
from samples import debug_utils


class MainActivity(metaclass=JavaClassDef, jvm_name='local/myapp/testnativeapp/MainActivity'):

    def __init__(self):
        pass

    @java_method_def(name='stringFromJNI', signature='()Ljava/lang/String;', native=True)
    def string_from_jni(self, mu):
        pass

    def test(self):
        pass


# Configure logging
logging.basicConfig(
    stream=sys.stdout,
    level=logging.DEBUG,
    format="%(asctime)s %(levelname)7s %(name)34s | %(message)s"
)

logger = logging.getLogger(__name__)

# Initialize emulator
emulator = Emulator(
    vfp_inst_set=True,
    vfs_root=posixpath.join(posixpath.dirname(__file__), "vfs")
)

# Register Java class.
emulator.java_classloader.add_class(MainActivity)

# Load all libraries.
emulator.load_library("example_binaries/libdl.so")
emulator.load_library("example_binaries/libc.so")
emulator.load_library("example_binaries/libstdc++.so")
emulator.load_library("example_binaries/libm.so")
lib_module = emulator.load_library("example_binaries/libnative-lib_jni.so")

# Show loaded modules.
logger.info("Loaded modules:")

for module in emulator.modules:
    logger.info("=> 0x%08x - %s" % (module.base, module.filename))

# Debug
# emulator.mu.hook_add(UC_HOOK_CODE, debug_utils.hook_code)
# emulator.mu.hook_add(UC_HOOK_MEM_UNMAPPED, debug_utils.hook_unmapped)
# emulator.mu.hook_add(UC_HOOK_MEM_WRITE, debug_utils.hook_mem_write)
# emulator.mu.hook_add(UC_HOOK_MEM_READ, debug_utils.hook_mem_read)

try:
    # Run JNI_OnLoad.
    #   JNI_OnLoad will call 'RegisterNatives'.
    emulator.call_symbol(lib_module, 'JNI_OnLoad', emulator.java_vm.address_ptr, 0x00)
    emulator.mu.hook_add(UC_HOOK_MEM_UNMAPPED, debug_utils.hook_unmapped)

    # Do native stuff.
    emulator.mu.hook_add(UC_HOOK_CODE, debug_utils.hook_code)
    main_activity = MainActivity()
    logger.info("Response from JNI call: %s" % main_activity.string_from_jni(emulator))

    # Dump natives found.
    logger.info("Exited EMU.")
    logger.info("Native methods registered to MainActivity:")

    for method in MainActivity.jvm_methods.values():
        if method.native:
            logger.info("- [0x%08x] %s - %s" % (method.native_addr, method.name, method.signature))
except UcError as e:
    print("Exit at %x" % emulator.mu.reg_read(UC_ARM_REG_PC))
    raise

    参考

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