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1.3 Android/iOS

1.3.1 Android root

1.3.1.1 硬件准备

在手机硬件的考虑上,首先优选谷歌的“亲儿子”:NexusPixel系列,鉴于官网上测试案例在Nexus 5X手机,系统为Android 8.1.0版本上进行测试,我们也会选用这款手机、和这个系统版本来进行实验。

官网也指出不可能在所有手机和所有ROM上完全进行测试,肯定是具体情况具体分析。

Also note that most of our recent testing has been taking place on a Nexus 5X running Android 8.1.0. Older and newer ROMs may work, but if you’re running into basic issues like Frida crashing the system when launching an app, this is due to ROM-specific quirks. We cannot test on all possible devices, so we count on your help to improve on this. However if you’re just starting out with Frida it is strongly recommended to go with a Nexus device with factory software, or an official 8.x emulator image for arm or arm64. (x86 may work too but has gone through significantly less testing.)

官网上依旧指出,选择Android 8.x系统的模拟器也是没问题的,架构必须选择arm或者arm64x86可能会有crash的情况发生。

Nexus 5X这款手机的硬件参数为:

1.3.1.2 刷入官方Android 8.1

frida官网指出的factory software就是谷歌的官方工厂镜像网站,打开这个网站可能需要科学上网。网站中间有一些操作指南,右边就是手机型号一览表,在这里我们选择Nexus 5X的型号bullhead

可以看到从安卓6到安卓8均支持,而且最新支持到8.1.0

...

我们使用wget命令来下载最新的8.1.0 (OPM7.181205.001, Dec 2018)版本,这样速度最快。

下载完成后记得校验SHA-256 Checksum,必须得于官网一致,否则下载文件已经损坏,无法使用,必须重新下载。

$ openssl dgst -sha256 bullhead-opm7.181205.001-factory-5f189d84.zip
SHA256(bullhead-opm7.181205.001-factory-5f189d84.zip)= 5f189d84781a26b49aca0de84a941a32ae0150da0aab89f1d7709d56c31b3c0a

可见SHA-256 Checksum与官网相同,接下来就是刷入该系统。

首先将手机进入fastboot状态,操作流程如下:

  1. USB线断开,并确保手机有80%左右的电量;
  2. 将手机完全关机;
  3. 同时按住音量向下键和开机键;
  4. 手机将进入fastboot状态;

状态如下:

PS:如果手机并没有解锁,也就是DEVICE STATE - 显示locked,那手机需要先解锁,得是unlocked,也就是图上的状态,才可以后续刷入recovery等操作。Nexus 5X手机解锁是比较简单的,这里不做演示了。

手机用USB线连上电脑,运行脚本,将系统刷进手机。

$ unzip bullhead-opm7.181205.001-factory-5f189d84.zip
Archive:  bullhead-opm7.181205.001-factory-5f189d84.zip
   creating: bullhead-opm7.181205.001/
  inflating: bullhead-opm7.181205.001/radio-bullhead-m8994f-2.6.42.5.03.img
  inflating: bullhead-opm7.181205.001/bootloader-bullhead-bhz32c.img
  inflating: bullhead-opm7.181205.001/flash-all.bat
  inflating: bullhead-opm7.181205.001/flash-all.sh
 extracting: bullhead-opm7.181205.001/image-bullhead-opm7.181205.001.zip
  inflating: bullhead-opm7.181205.001/flash-base.sh
$ cd bullhead-opm7.181205.001
$ ./flash-all.sh
target reported max download size of 536870912 bytes
sending 'bootloader' (4610 KB)...
OKAY [  0.197s]
writing 'bootloader'...
OKAY [  0.174s]
finished. total time: 0.371s
rebooting into bootloader...
OKAY [  0.020s]
finished. total time: 0.020s
target reported max download size of 536870912 bytes
sending 'radio' (56630 KB)...
OKAY [  1.629s]
writing 'radio'...
OKAY [  0.917s]
finished. total time: 2.546s
rebooting into bootloader...
OKAY [  0.020s]
finished. total time: 0.020s
extracting android-info.txt (0 MB) to RAM...
extracting boot.img (11 MB) to disk... took 0.125s
target reported max download size of 536870912 bytes
archive does not contain 'boot.sig'
archive does not contain 'dtbo.img'
archive does not contain 'dt.img'
extracting recovery.img (17 MB) to disk... took 0.093s
archive does not contain 'recovery.sig'
extracting system.img (1909 MB) to disk... took 17.733s
archive does not contain 'system.sig'
archive does not contain 'vbmeta.img'
extracting vendor.img (185 MB) to disk... took 1.895s
archive does not contain 'vendor.sig'
wiping userdata...
mke2fs 1.43.3 (04-Sep-2016)
Creating filesystem with 2874363 4k blocks and 719488 inodes
Filesystem UUID: 79218aab-c322-4823-a83f-5a26ad3fd27e
Superblock backups stored on blocks:
	32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208

Allocating group tables: done
Writing inode tables: done
Creating journal (16384 blocks): done
Writing superblocks and filesystem accounting information: done

wiping cache...
mke2fs 1.43.3 (04-Sep-2016)
Creating filesystem with 24576 4k blocks and 24576 inodes

Allocating group tables: done
Writing inode tables: done
Creating journal (1024 blocks): done
Writing superblocks and filesystem accounting information: done

--------------------------------------------
Bootloader Version...: BHZ32c
Baseband Version.....: M8994F-2.6.42.5.03
Serial Number........: 00f4d2e97de8bd23
--------------------------------------------
checking product...
OKAY [  0.020s]
checking version-bootloader...
OKAY [  0.020s]
checking version-baseband...
OKAY [  0.020s]
sending 'boot' (11781 KB)...
OKAY [  0.358s]
writing 'boot'...
OKAY [  0.192s]
sending 'recovery' (17425 KB)...
OKAY [  0.519s]
writing 'recovery'...
OKAY [  0.294s]
erasing 'system'...
OKAY [  0.452s]
sending sparse 'system' 1/4 (508768 KB)...
OKAY [ 14.932s]
writing 'system' 1/4...
OKAY [  9.061s]
sending sparse 'system' 2/4 (524238 KB)...
OKAY [ 15.055s]
writing 'system' 2/4...
OKAY [  9.168s]
sending sparse 'system' 3/4 (501061 KB)...
OKAY [ 15.391s]
writing 'system' 3/4...
OKAY [  9.779s]
sending sparse 'system' 4/4 (421469 KB)...
OKAY [ 12.113s]
writing 'system' 4/4...
OKAY [  7.220s]
erasing 'vendor'...
OKAY [  0.110s]
sending 'vendor' (190332 KB)...
OKAY [  5.327s]
writing 'vendor'...
OKAY [  3.776s]
erasing 'userdata'...
OKAY [  0.758s]
sending 'userdata' (4284 KB)...
OKAY [  0.199s]
writing 'userdata'...
OKAY [  0.104s]
erasing 'cache'...
OKAY [  0.077s]
sending 'cache' (92 KB)...
OKAY [  0.082s]
writing 'cache'...
OKAY [  0.020s]
rebooting...

finished. total time: 105.131s

刷机完成后,手机会自动重启,重启完成后即可自动进入系统。

1.3.1.3 刷入twrp recovery

recovery相当于Windows PE微型系统,在recovery里我们也可以挂载磁盘,修改系统分区,使用adb命令,等一系列功能。详细的功能列表可以百度或者谷歌。

我们这里只需要下载twrp针对bullhead机型的镜像,刷进去即可。

我们下载最新的twrp-3.2.3-0-bullhead.img镜像文件。

然后将手机设置到fastboot模式,使用fastboot命令将镜像刷进去。

$ fastboot flash recovery twrp-3.2.3-0-bullhead.img
target reported max download size of 536870912 bytes
sending 'recovery' (16289 KB)...
OKAY [  0.499s]
writing 'recovery'...
OKAY [  0.275s]
finished. total time: 0.774s

刷完之后,在手机上按两次音量向下键,选择Recovery mode,按电源键进入。

稍等片刻之后,就会进入twrp 3.2.3-0系统。

直接滑开即可。意味着允许修改系统。

可以看到功能非常丰富。

1.3.1.4 刷入Magisk

自从SuperSU卖给中国人,并且不再更新之后,大家已经不怎么使用这款root软件了,取而代之的是Magisk

Magisk是由中国台湾省小伙儿topjohnwu开发的一款完全开源的root软件,其github项目托管主页在这里

有关Magisk的详细中文介绍,大家可以看这篇文章,我们只是用Magisk来获取root权限。

github项目主页的release页面,下载最新的卡刷包:Magisk-v17.3.zip

然后使用adb命令将卡刷包上传到手机中去。

$ adb push Magisk-v17.3.zip /sdcard/
* daemon not running; starting now at tcp:5037
* daemon started successfully
Magisk-v17.3.zip: 1 file pushed. 6.5 MB/s (4178628 bytes in 0.610s)

然后使用twrp将这个卡刷包安装进手机里。首先点选上一节最后一张图中的Install

然后选择我们刚刚传输进去的Magisk-v17.3.zip卡刷包。

滑动确认安装。

安装完成后直接重启即可,Reboot System

滑动重启。

重启后发现Magisk Manager已经安装好了,并且是作为系统App,卸载不了的。卸载只有安装官网release页面里的Magisk-uninstaller-20181022.zip卡刷包。

打开App可以看到安装成功。

1.3.1.5 获取root权限

接下来就是使用adb命令进入安卓手机的shell,并且获取root权限,为下一节做好准备。

在手机上找到设置→系统→关于手机→版本号,点击版本号五下,打开开发者选项,然后进入设置→系统→开发者选项,打开USB调试选项。然后USB连接到电脑,使用adb命令连上去。手机上会出现授权,点击接受该指纹的电脑连接。

$ adb shell
bullhead:/ $
bullhead:/ $
bullhead:/ $ whoami
shell
bullhead:/ $

此时是shell权限,权限非常小。我们来切换到root用户:

bullhead:/ $ su -

此时手机上会出现Magisk的超级用户请求,点击允许,com.android.shell即可获取root权限。

点击允许之后,su -这个命令才会返回,然后运行whoami命令,可以看到已经是root了。

bullhead:/ #
bullhead:/ # whoami
root
bullhead:/ #
bullhead:/ #

这时候就可以用root的权限来做一些事情了。

1.3.2 Android frida-server 安装

上一节中刷机,获取root其实倒是蛮复杂的,这一节安装frida-server其实倒是简单很多,我们从官方github页面的release标签里,找到最新版的frida-server,注意要匹配系统和架构,比如armarm64就不能搞错,比如我们这里选择的就是frida-server-12.2.26-android-arm64.xz的版本。

下载完成后进行解压,获得linux原生的可执行文件,我们将它重命名为frida-server

$ file frida-server
frida-server-arm64: ELF 64-bit LSB shared object ARM aarch64, version 1 (SYSV), dynamically linked, interpreter /system/bin/linker64, stripped

使用adb命令将其推送到手机上去。

$ adb push frida-server /data/local/tmp/

然后使用adb shell命令进入到手机中去,执行以下命令:

$ adb shell
bullhead:/ $ su -
bullhead:/ # whoami
root
bullhead:/ # cd /data/local/tmp/
bullhead:/data/local/tmp # chmod 755 /data/local/tmp/frida-server
bullhead:/data/local/tmp # ./frida-server &
[1] 9849
bullhead:/data/local/tmp #

frida-server即可运行成功。

此时在电脑上新开一个shell,运行frida-ps -U命令,即可显示手机中正在运行的进程。

$ frida-ps -U
 PID  Name
----  ---------------------------------------------------
9628  -
5389  .esfm
 591  ATFWD-daemon
2953  adbd
 596  android.hardware.biometrics.fingerprint@2.1-service
 398  android.hardware.cas@1.0-service
 399  android.hardware.configstore@1.0-service
 400  android.hardware.dumpstate@1.0-service.bullhead
 401  android.hardware.graphics.allocator@2.0-service
 402  android.hardware.usb@1.0-service
 403  android.hardware.wifi@1.0-service
 397  android.hidl.allocator@1.0-service
7456  android.process.acore
3098  android.process.media
 567  audioserver
 568  cameraserver
 592  cnd
 588  cnss-daemon
 977  com.android.bluetooth
8829  com.android.connectivity.metrics
8275  com.android.keychain
3026  com.android.nfc
1175  com.android.phone
5184  com.android.settings
1020  com.android.systemui
7414  com.android.vending
3417  com.estrongs.android.pop
8247  com.estrongs.android.pop:local
5916  com.google.android.apps.gcs
8711  com.google.android.apps.messaging
8747  com.google.android.apps.messaging:rcs
7721  com.google.android.apps.photos

到这里我们在64位手机Nexus 5X的安卓原生8.1系统上安装frida-server就成功了。