android 安全sdk相关

前述

        在网上有看到许多android安全sdk相关的内容，有重复的也有比较新鲜的内容，这里做一个整体的合集，以及后续又看到一些比较新的东西会一起放在这里。

        android内sdk目前可以分为以下几个部分（有一些部分可能会存在一些重合）——设备指纹，root相关，环境检测，模拟器特征，改机软件

设备指纹

1.android_id

google给的app唯一id，存放在/data/system/users/0/settings_ssaid.xml文件中，只有在文件存储位置处修改，设备重刷或设备恢复出厂设置等时候才会被修改。可以用Settings.Global.getString() 、Settings.Secure.getString()、Settings.System.getString()来获取(根据/data/system/users/0/下的文件名字推测可用这些方法获取该目录下一些文件的内容)

2.drmid(设备媒体id)

media drm的设备id，同时和app包名以及签名有关，即不同包名或者不同签名，drmid会不一样，可以视为另外一个android_id，缺点是还和包名有关，注意：极少数机型上获取该id的过程存在崩溃且google也在逐渐的废除该id,可参考：https://developer.android.com/identity/user-data-ids

UUID wideVineUuid = new UUID(-0x121074568629b532L, -0x5c37d8232ae2de13L);
try {MediaDrm wvDrm = new MediaDrm(wideVineUuid);byte[] wideVineId = wvDrm.getPropertyByteArray(MediaDrm.PROPERTY_DEVICE_UNIQUE_ID);return Utils.md5(wideVineId);
} catch (Exception e) {return null;
}

3.gsfiid

gsfiid是Google Service Framework ID，Google服务框架 ID

public static String gsfid() {Context context = DeviceGlobal.getContext();Uri uri = Uri.parse("content://com.google.android.gsf.gservices");if (uri != null) {try (Cursor cursor = context.getContentResolver().query(uri,null, null,new String[]{"android_id"}, null)) {if (cursor.moveToFirst()) {return Long.toHexString(Long.parseLong(cursor.getString(1)));}} catch (Throwable tr) {Logger.w(TAG, tr.toString());}}return null;
}

4.apk相关

apk安装时间和路径，可以通过getPackageInfo中的firstInstallTime获取，可以作为唯一id和防刷

5.boot_id,oaid,imei,serial number

boot_id可以通过cat /proc/sys/kernel/random/boot_id获取，重启后会更新，是uuid格式字符串格式。

imei是SIM卡相关的信息，谷歌已经删除该属性来保护隐私性

serial number是手机adb devices的一串数字，可以通过getprop ro.serialno获取

oaid是国内android广告标识符，用户可以选择重置和退出广告跟踪。

6.文件哈希

使用stat获取/，/data/，/data/system/vendor/firmware，/system/bin，/vendor/lib，/systen/framework，/system/fonts，或者一些固定app目录的文件名，inode，uid，创建时间，最后修改时间组合等属性组合求hash作为指纹

7.网络相关

这里主要是指机器的ip，mac，网络的类型，这里的信息除了可以做设备指纹之外，也可以用来判断设备的环境等特征。获取方法可以通过ip -a或者ip neigh show命令行执行或者读取/proc/net/arp获取相关信息

root检测

1.path检测

getenv("path") 获取路径，和su或者magisk组合，判断root是否存在

2.属性获取

可以通过以下属性特征来判断设备是不是root了

getprop service.adb.root = "1"
getprop init.svc.adb_root = "running"
getprop ro.secure = "0"
getprop ro.debuggable = "1"
getprop ro.build.tags = "test-keys"

3.内存扫描

内存扫描有以下几种方式——1.检测/proc/self/maps 是否存在名为“/memfd:/jit-cache"的段（加载zygisk模块）；2.检测栈空间[stack]的权限是否为"rw-p"；3.检测map表是否存在匿名的且具有可执行属性。

4.selinux上下文检测

cat /proc/self/attr/prev，看文件中的内容是否为"u:r:zygote:s0"，其中r表示进程，zygote表示进程权限

5.常见root应用检测

可以尝试包名检测，遍历/data/data/目录，看有没有一下目录

com.topjohnwu.magisk
eu.chainfire.supersu
com.noshufou.android.su
com.noshufou.android.su.elite
com.koushikdutta.superuser
com.thirdparty.superuser
com.yellowes.su
com.fox2code.mmm
io.github.vvb2060.magisk
com.kingroot.kinguser
com.kingo.root
com.smedialink.oneclickroot
com.zhiqupk.root.global
com.alephzain.framaroot
io.github.huskydg.magisk
me.weishu.kernelsu

6.其他

可以尝试访问/data，/system，/etc，查询是否有busybox可以执行——尝试which busybox或者是执行busybox

hook检测

1.frida检测

• 默认端口检测——27042
• 常见路径检测——/data/local/tmp/frida-server
• 检查进程/proc/self/fd/目录，寻找是否存在关键字linjector
• 内存模块扫描——frida-agent，frida-gadge，可以去/proc/self/maps文件下找找字符串
• inlinehook检测frida——查询函数头部是不是0xd61f020058000050

2.Xposed检测

• java.lang.ClassLoader.getSystemClassLoader.loadClass("de.robv.android.xposed.XposedHelpers") ——看xposed是否加载
• 遍历/data/data/目录，寻找有无以下包名

de.robv.android.xposed.installer #Xposed框架
org.meowcat.edxposed.manager #EdXposed框架
com.tsng.hidemyapplist #隐藏应用列表
com.tsng.hidemyroot #隐藏Root
org.lsposed.manager #LSPosed框架
me.weishu.exp #VirtualXposed 太极
top.canyie.dreamland.manager #VirtualXposed 夢境
io.va.exposed #VirtualXposed 夢境
io.va.exposed64 #VirtualXposed 夢境
io.virtualapp #VirtualApp
io.virtualapp.sandvxposed64 #VirtualApp

• 检测下列文件或文件路径是否存在

/sbin/.magisk/modules/riru_lsposed
/data/adb/lspd
/sbin/.magisk/modules/zygisk_lsposed
/sbin/.magisk/modules/riru_edxposed
/data/misc/riru/modules/edxp
/data/adb/riru/modules/edxp.prop
/sbin/.magisk/modules/taichi
/data/misc/taichi
/sbin/.magisk/modules/dreamland
/data/misc/riru/modules/dreamland
/data/adb/riru/modules/dreamland
/system/bin/app_process.orig
/system/xposed.prop
/system/framework/XposedBridge.jar
/system/lib/
libxposed_art.so
/system/lib/
libxposed_art.so
.no_orig
/system/lib64/
libxposed_art.so
/system/lib64/
libxposed_art.so
.no_orig
/system/bin/app_process_zposed
/system/framework/ZposedBridge.jar
/system/lib/
libzposed_art.so

• artmethod结构体判断，artmethod中access_flags和entry_point_from_jni_在hook过程中会发生更改。

3.调试检测

• 调试端口检测——读取/proc/net/tcp，ida远程调试端口用的是23946端口
• 调试进程名检测——直接ps -a，看是否有android-server或者adb-server
• tracepid检测——读取/proc/self/status，查看tracepid是不是为0
• ptrace检测——因为每个进程只能被一个ptrace检测，所以可以自己启动一个ptrace或者对ptrace检测
• 断电指令检测——检测bkpt指令
• dalvik模式下可以用libdvm.so中dvmDbgIsDebuggerConnected()函数检测，art模式下使用libart.so中gDebuggerActive中
• 可以读取/proc/self/cmdline查看内容是否为zygote

模拟器云手机检测

1.特有的文件

模拟器特有文件

"/boot/bstmods/vboxguest.ko",
"/boot/bstmods/vboxsf.ko",
"/dev/mtp_usb",
"/dev/qemu_pipe",
"/dev/socket/baseband_genyd",
"/dev/socket/genyd",
"/dev/socket/qemud",
"/dev/socket/windroyed-audio",
"/dev/socket/windroyed-camera",
"/dev/socket/windroyed-gps",
"/dev/socket/windroyed-sensors",
"/dev/vboxguest",
"/dev/vboxpci",
"/dev/vboxuser",
"/fstab.goldfish",
"/fstab.nox",
"/fstab.ranchu-encrypt",
"/fstab.ranchu-noencrypt",
"/fstab.ttVM_x86",
"/fstab.vbox86",
"/init.goldfish.rc",
"/init.magisk.rc",
"/init.nox.rc",
"/init.ranchu-encrypt.rc",
"/init.ranchu-noencrypt.rc",
"/init.ranchu.rc",
"/init.ttVM_x86.rc",
"/init.vbox86.rc",
"/init.vbox86p.rc",
"/init.windroye.rc",
"/init.windroye.sh",
"/init.x86.rc",
"/proc/irq/20/vboxguest",
"/sdcard/Android/data/com.redfinger.gamemanage",
"/stab.andy",
"/sys/bus/pci/drivers/vboxguest",
"/sys/bus/pci/drivers/vboxpci",
"/sys/bus/platform/drivers/qemu_pipe",
"/sys/bus/platform/drivers/qemu_pipe/qemu_pipe",
"/sys/bus/platform/drivers/qemu_trace",
"/sys/bus/virtio/drivers/itolsvmlgtp",
"/sys/bus/virtio/drivers/itoolsvmhft",
"/sys/class/bdi/vboxsf-1",
"/sys/class/bdi/vboxsf-2",
"/sys/class/bdi/vboxsf-3",
"/sys/class/misc/qemu_pipe",
"/sys/class/misc/vboxguest",
"/sys/class/misc/vboxuser",
"/sys/devices/platform/qemu_pipe",
"/sys/devices/virtual/bdi/vboxsf-1",
"/sys/devices/virtual/bdi/vboxsf-2",
"/sys/devices/virtual/bdi/vboxsf-3",
"/sys/devices/virtual/misc/qemu_pipe",
"/sys/devices/virtual/misc/vboxguest",
"/sys/devices/virtual/misc/vboxpci",
"/sys/devices/virtual/misc/vboxuser",
"/sys/fs/selinux/booleans/in_qemu",
"/sys/kernel/debug/bdi/vboxsf-1",
"/sys/kernel/debug/bdi/vboxsf-2",
"/sys/kernel/debug/x86",
"/sys/module/qemu_trace_sysfs",
"/sys/module/vboxguest",
"/sys/module/vboxguest/drivers/pci:vboxguest",
"/sys/module/vboxpcism",
"/sys/module/vboxsf",
"/sys/module/vboxvideo",
"/sys/module/virtio_pt/drivers/virtio:itoolsvmhft",
"/sys/module/virtio_pt_ie/drivers/virtio:itoolsvmlgtp",
"/sys/qemu_trace",
"/system/app/GenymotionLayout",
"/system/bin/OpenglService",
"/system/bin/androVM-vbox-sf",
"/system/bin/droid4x",
"/system/bin/droid4x-prop",
"/system/bin/droid4x-vbox-sf",
"/system/bin/droid4x_setprop",
"/system/bin/enable_nox",
"/system/bin/genymotion-vbox-sf",
"/system/bin/microvirt-prop",
"/system/bin/microvirt-vbox-sf",
"/system/bin/microvirt_setprop",
"/system/bin/microvirtd",
"/system/bin/mount.vboxsf",
"/system/bin/nox",
"/system/bin/nox-prop",
"/system/bin/nox-vbox-sf",
"/system/bin/nox_setprop",
"/system/bin/noxd",
"/system/bin/noxscreen",
"/system/bin/noxspeedup",
"/system/bin/qemu-props",
"/system/bin/qemud",
"/system/bin/shellnox",
"/system/bin/ttVM-prop",
"/system/bin/windroyed",
"/system/droid4x",
"/system/etc/init.droid4x.sh",
"/system/etc/init.tiantian.sh",
"/system/lib/egl/libEGL_emulation.so",
"/system/lib/egl/libEGL_tiantianVM.so",
"/system/lib/egl/libEGL_windroye.so",
"/system/lib/egl/libGLESv1_CM_emulation.so",
"/system/lib/egl/libGLESv1_CM_tiantianVM.so",
"/system/lib/egl/libGLESv1_CM_windroye.so",
"/system/lib/egl/libGLESv2_emulation.so",
"/system/lib/egl/libGLESv2_tiantianVM.so",
"/system/lib/egl/libGLESv2_windroye.so",
"/system/lib/hw/audio.primary.vbox86.so",
"/system/lib/hw/audio.primary.windroye.so",
"/system/lib/hw/audio.primary.x86.so",
"/system/lib/hw/autio.primary.nox.so",
"/system/lib/hw/camera.vbox86.so",
"/system/lib/hw/camera.windroye.jpeg.so",
"/system/lib/hw/camera.windroye.so",
"/system/lib/hw/camera.x86.so",
"/system/lib/hw/gps.nox.so",
"/system/lib/hw/gps.vbox86.so",
"/system/lib/hw/gps.windroye.so",
"/system/lib/hw/gralloc.nox.so",
"/system/lib/hw/gralloc.vbox86.so",
"/system/lib/hw/gralloc.windroye.so",
"/system/lib/hw/sensors.nox.so",
"/system/lib/hw/sensors.vbox86.so",
"/system/lib/hw/sensors.windroye.so",
"/system/lib/init.nox.sh",
"/system/lib/libGM_OpenglSystemCommon.so",
"/system/lib/libc_malloc_debug_qemu.so",
"/system/lib/libclcore_x86.bc",
"/system/lib/libdroid4x.so",
"/system/lib/libnoxd.so",
"/system/lib/libnoxspeedup.so",
"/system/lib/modules/3.10.30-android-x86.hd+",
"/system/lib/vboxguest.ko",
"/system/lib/vboxpcism.ko",
"/system/lib/vboxsf.ko",
"/system/lib/vboxvideo.ko",
"/system/lib64/egl/libEGL_emulation.so",
"/system/lib64/egl/libGLESv1_CM_emulation.so",
"/system/lib64/egl/libGLESv2_emulation.so",
"/vendor/lib64/egl/libEGL_emulation.so",
"/vendor/lib64/egl/libGLESv1_CM_emulation.so",
"/vendor/lib64/egl/libGLESv2_emulation.so",
"/vendor/lib64/libandroidemu.so",
"/system/lib64/hw/gralloc.ranchu.so",
"/system/lib64/libc_malloc_debug_qemu.so",
"/system/usr/Keylayout/droid4x_Virtual_Input.kl",
"/system/usr/idc/Genymotion_Virtual_Input.idc",
"/system/usr/idc/droid4x_Virtual_Input.idc",
"/system/usr/idc/nox_Virtual_Input.idc",
"/system/usr/idc/windroye.idc",
"/system/usr/keychars/nox_gpio.kcm",
"/system/usr/keychars/windroye.kcm",
"/system/usr/keylayout/Genymotion_Virtual_Input.kl",
"/system/usr/keylayout/nox_Virtual_Input.kl",
"/system/usr/keylayout/nox_gpio.kl",
"/system/usr/keylayout/windroye.kl",
"system/etc/init/ndk_translation_arm64.rc",
"/system/xbin/noxsu",
"/ueventd.android_x86.rc",
"/ueventd.andy.rc",
"/ueventd.goldfish.rc",
"/ueventd.nox.rc",
"/ueventd.ranchu.rc",
"/ueventd.ttVM_x86.rc",
"/ueventd.vbox86.rc",
"/vendor/lib64/libgoldfish-ril.so",
"/vendor/lib64/libgoldfish_codecs_common.so",
"/vendor/lib64/libstagefright_goldfish_avcdec.so",
"/vendor/lib64/libstagefright_goldfish_vpxdec.so",
"/x86.prop",
"/system/lib/virtio_pt.ko", //itoolsAVM
"dev/bst_gps", //BlueStacks
"/dev/bstgyro", //BlueStacks Game
"/system/bin/bstfolder", //BlueStacks Game
"/system/lib/msf.ko", //memu
"/dev/nemuuser", //Mumu
"/dev/nemuinit", //Mumu
"/system/lib/fastpipe.ko", //Dnplayer
"/fstab.andy", //AndY
"/dev/virtiopt",    //itoolsAVM or nox
"/sys/module/vboxsf/srcversion", //vbox
"/dev/goldfish_pipe"  //qemu

2.特有的属性

• qemu特有的属性

"ro.kernel.qemu.avd_name",
"ro.kernel.qemu.gles",
"ro.kernel.qemu.gltransport",
"ro.kernel.qemu.opengles.version",
"ro.kernel.qemu.uirenderer",
"ro.kernel.qemu.vsync",
"ro.qemu.initrc",
"init.svc.qemu-props",
"qemu.adb.secure",
"qemu.cmdline",
"qemu.hw.mainkeys",
"qemu.logcat",
"ro.adb.qemud",
"qemu.sf.fake_camera",
"qemu.sf.lcd_density",
"qemu.timezone",
"init.svc.goldfish-logcat",
"ro.boottime.goldfish-logcat",
"ro.hardware.audio.primary",
"init.svc.ranchu-net",
"init.svc.ranchu-setup",
"ro.boottime.ranchu-net",
"ro.boottime.ranchu-setup",
"init.svc.droid4x",
"init.svc.noxd",
"init.svc.qemud",
"init.svc.goldfish-setup",
"init.svc.goldfish-logcat",
"init.svc.ttVM_x86-setup",
"vmos.browser.home",
"vmos.camera.enable",
"ro.trd_yehuo_searchbox",
"init.svc.microvirtd",
"init.svc.vbox86-setup",
"ro.ndk_translation.version",
"redroid.width",
"redroid.height",
"redroid.fps",
"ro.rf.vmname"

• 模拟器属性

"init.svc.microvirtd",
"bst.version",
"ro.phoenix.version.code",
"ro.phoenix.version.codename",
"init.svc.droid4x",
"microvirt.memu_version",
"microvirt.imsi",
"microvirt.simserial",
"ro.px.version.build",
"ro.phoenix.os.branch",
"init.svc.su_kpbs_daemon",
"init.svc.noxd",
"init.svc.ttVM_x86-setup",
"init.svc.xxkmsg",
"ro.bild.remixos.version",
"microvirt.mut",
"init.svc.ldinit",
"sys.tencent.os_version",
"sys.tencent.android_id",
"ro.genymotion.version",
"init.svc.pkVM_x86-setup",
"ro.andy.version",
"ro.build.version.release",
"ro.product.model",
"ro.product.brand",
"ro.boot.bootloader",
"ro.build.version.securitypatch",
"ro.build.version.incremental",
"gsm.version.baseband",
"gsm.version.ril-impl",
"ro.build.fingerprint",
"ro.build.description",
"ro.build.product",
"ro.boot.vbmeta.digest",
"ro.hardware",
"ro.product.name",
"ro.product.board",
"ro.recovery_id",
"ro.expect.recovery_id",
"ro.board.platform",
"ro.product.manufacturer",
"ro.product.device",
"sys.usb.state",
"ro.setupwizard.mode",
"ro.build.id",
"ro.build.tags",
"ro.build.type",
"ro.debuggable"

3.系统架构判断

主要是判断系统是x86还是arm，arm64的，通常手机是arm或者arm64架构的，模拟器是x86架构的，这里获取的方式使用seccomp来判断

先安装seccomp架子
void install_check_arch_seccomp() {struct sock_filter filter[15] = {BPF_STMT(BPF_LD + BPF_W + BPF_ABS, (uint32_t) offsetof(struct seccomp_data, nr)),BPF_JUMP(BPF_JMP + BPF_JEQ, __NR_getpid, 0, 12),BPF_STMT(BPF_LD + BPF_W + BPF_ABS, (uint32_t) offsetof(struct seccomp_data, args[0])),BPF_JUMP(BPF_JMP + BPF_JEQ, DetectX86Flag, 0, 10),BPF_STMT(BPF_LD + BPF_W + BPF_ABS, (uint32_t) offsetof(struct seccomp_data, arch)),BPF_JUMP(BPF_JMP + BPF_JEQ, AUDIT_ARCH_X86_64, 0, 1),BPF_STMT(BPF_RET + BPF_K, SECCOMP_RET_ERRNO | (864 & SECCOMP_RET_DATA)),BPF_JUMP(BPF_JMP + BPF_JEQ, AUDIT_ARCH_I386, 0, 1),BPF_STMT(BPF_RET + BPF_K, SECCOMP_RET_ERRNO | (386 & SECCOMP_RET_DATA)),BPF_JUMP(BPF_JMP + BPF_JEQ, AUDIT_ARCH_ARM, 0, 1),BPF_STMT(BPF_RET + BPF_K, SECCOMP_RET_ERRNO | (0xA32 & SECCOMP_RET_DATA)),BPF_JUMP(BPF_JMP + BPF_JEQ, AUDIT_ARCH_AARCH64, 0, 1),BPF_STMT(BPF_RET + BPF_K, SECCOMP_RET_ERRNO | (0xA64 & SECCOMP_RET_DATA)),BPF_STMT(BPF_RET + BPF_K, SECCOMP_RET_ERRNO | (6 & SECCOMP_RET_DATA)),BPF_STMT(BPF_RET + BPF_K, SECCOMP_RET_ALLOW)};struct sock_fprog program = {.len = (unsigned short) (sizeof(filter) / sizeof(filter[0])),.filter = filter};errno = 0;if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {LOG(ERROR) << "prctl(PR_SET_NO_NEW_PRIVS) " << strerror(errno);}errno = 0;if (prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &program)) {LOG(ERROR) << "prctl(PR_SET_SECCOMP) " << strerror(errno);}
}配合上面的代码 。启动调用getpid， 上面的架子会对getpid函数进行拦截 ，然后架构进行判断
string check_arch_by_seccomp() {if (get_sdk_level() < __ANDROID_API_N_MR1__){return "";}errno = 0;syscall(__NR_getpid, DetectX86Flag);if (errno == 386) {return "I386设备";} else if (errno == 864) {return "X86_64设备";} else if (errno == 0xA32 || errno == 0xA64) {return "";}else if (errno == 0) {//可能是没有开启seccompreturn "";}return ("疑似X86模拟器设备"+ to_string(errno));
}