Android结合Frida的硬核抓包大法

前言

这篇文章是我找了好久才在收藏夹里面找到的。转载自吾爱论坛：https://www.52pojie.cn/thread-1405917-1-1.html

准备工作

已 root 的安卓手机(貌似ios也不能root吧)
frida环境一套(刚发现我竟然忘记写frida教程了)
操作原理
使用tcpdump去从系统层次去抓包，然后通过firda去hook需要抓包的app，拿到sslkey，然后利用sslkey去解密tcpdump抓到的包
操作原理
tcpdump的抓包方面
1.1 手机中执行 tcpdump
```
tcpdump -i any -s 0 -w /sdcard/Download/capture.pcap
```
2.1 手机没有tcpdump的
下载地址：https://www.androidtcpdump.com/android-tcpdump/downloads
如果遇到权限不够的，先push到sdcard/ 再移动过去
```
adb push tcpdump /data/local/tmp/
```
2.2 在手机中执行给权限
```
chmod 777 tcpdump
```
2.3 继续执行1.1
```
./tcpdump -i any -s 0 -w /sdcard/Download/capture.pcap
```
frida的hook方面
1.1 查看frida信息

frida 命令选项更多关于frida信息可以查看frida官方信息 https://frida.re/docs/home/

C:\Users\User>frida -h
Usage: frida [options] target

Options:
--version             show program's version number and exit
-h, --help            show this help message and exit
-D ID, --device=ID    connect to device with the given ID
-U, --usb             connect to USB device
-R, --remote          connect to remote frida-server
-H HOST, --host=HOST  connect to remote frida-server on HOST
-f FILE, --file=FILE  spawn FILE
-F, --attach-frontmost
                      attach to frontmost application
-n NAME, --attach-name=NAME
                      attach to NAME
-p PID, --attach-pid=PID
                      attach to PID
--stdio=inherit|pipe  stdio behavior when spawning (defaults to “inherit”)
--runtime=duk|v8      script runtime to use (defaults to “duk”)
--debug               enable the Node.js compatible script debugger
-l SCRIPT, --load=SCRIPT
                      load SCRIPT
-P PARAMETERS_JSON, --parameters=PARAMETERS_JSON
                      Parameters as JSON, same as Gadget
-C CMODULE, --cmodule=CMODULE
                      load CMODULE
-c CODESHARE_URI, --codeshare=CODESHARE_URI
                      load CODESHARE_URI
-e CODE, --eval=CODE  evaluate CODE
-q                    quiet mode (no prompt) and quit after -l and -e
--no-pause            automatically start main thread after startup
-o LOGFILE, --output=LOGFILE
                      output to log file
--exit-on-error       exit with code 1 after encountering any exception in
                      the SCRIPT

2.1 编写frida脚本（sslkeyfilelog.js）

function startTLSKeyLogger(SSL_CTX_new, SSL_CTX_set_keylog_callback) {
  console.log("start----")
  function keyLogger(ssl, line) {
      console.log(new NativePointer(line).readCString());
  }
  const keyLogCallback = new NativeCallback(keyLogger, 'void', ['pointer', 'pointer']);

  Interceptor.attach(SSL_CTX_new, {
      onLeave: function(retval) {
          const ssl = new NativePointer(retval);
          const SSL_CTX_set_keylog_callbackFn = new NativeFunction(SSL_CTX_set_keylog_callback, 'void', ['pointer', 'pointer']);
          SSL_CTX_set_keylog_callbackFn(ssl, keyLogCallback);
      }
  });
}
startTLSKeyLogger(
  Module.findExportByName('libssl.so', 'SSL_CTX_new'),
  Module.findExportByName('libssl.so', 'SSL_CTX_set_keylog_callback')
)
// https://codeshare.frida.re/@k0nserv/tls-keylogger/

2.2 运行此frida脚本

frida -U -f package -l ./sslkeyfilelog.js --no-pause

解密数据包部分

1.1 导出tcpdump的日志

将 /sdcard/Download/capture.pcap 保存到电脑即可

1.2 导出frida的日志

手动复制粘贴吧，没有什么好办法，将日志保存到sslkey.txt文件里

大概像下面酱婶(这样式)，别掺杂别的就行

CLIENT_RANDOM 557e6dc49faec93dddd41d8c55d3a0084c44031f14d66f68e3b7fb53d3f9586d 886de4677511305bfeaee5ffb072652cbfba626af1465d09dc1f29103fd947c997f6f28962189ee809944887413d8a20
CLIENT_RANDOM e66fb5d6735f0b803426fa88c3692e8b9a1f4dca37956187b22de11f1797e875 65a07797c144ecc86026a44bbc85b5c57873218ce5684dc22d4d4ee9b754eb1961a0789e2086601f5b0441c35d76c448
CLIENT_RANDOM e1c1dcaaf73a8857ee60f5b38979084c3e95fdebd9791bbab985a8f954132426 41dcf3d5e41cb469494bf5014a1ecca9f40124f5728895265fadd38f8dc9d5ac15c5fa6588c1ea68f38476297fe76183
CLIENT_RANDOM 66c4f37afb2152e3837c8a7c48ce51e8307e6739e1fe3efc542887bbcae4f02a bbafe4881084570af01bed59f95bfcf7bc49d2e55acbc7fe33c1e06f8ff0bc2e747c2c428e7cd13f1c77c2141085f951
CLIENT_RANDOM 8d0d92154ee030486a2b13f9441f85ef33c5e06732fbb06a1ac81fe34b6f2ce3 8270b34eee784e7f7de45f39af36f26e6abf99bb52fa8350945e3ebf79dc1c53a0693c24b0780ce3a54d39fd4b5b5149
CLIENT_RANDOM b5d58899346db525f14312cfb52c1247ed7adb710ae43428bd331ce27d77dbc1 9effd5b469ef6fdf7a056ea50fc3ff0fdf9fa40ae709805bea8678ddce404f211ed534623876a5c616f3e7bc43121f48
CLIENT_RANDOM af1b3f9ba0b4c27756c93595eb54cac6f0d8c6e9e4f0fcb1a36c45f0cd12060d 696a6fff39bf6c9863901a2145703de948c37e1abf6b4c03628118bee11c292239304ee020c71ff31a293fc6b9439364
CLIENT_RANDOM e2a3d8e6b638976aa27c8cf031be5e6b03cf7ffa573be101816d5103025d404b 2b006379423d7252c864a129b6c5a693b75d477dc5d3f894af5f02db755c4f6dd54470b659882871c62ce002792e211a
CLIENT_RANDOM 1c8cfe911e2111d80dc81c275c791c04467e8d7bca16963acec6a20051429981 bf08334d973d44d80c8f4542c2356a5fd9e0d390afde0374179cc81dd82aaa15aae52604988e9c9616ad0795c79c81ed

2.1 打开.pcap文件进入Wireshark

// Wireshark快速过滤
(http.request or tls.handshake.type eq 1) and !(ssdp)

也可以像下面筛选常用数据流

1、筛选经过 127.0.0.1 主机的所有数据包
>> ip.addr == 127.0.0.1

2、筛选目的地址是 127.0.0.1 的所有数据包
>> ip.dst == 127.0.0.1

3、筛选源地址是 127.0.0.1 的所有数据包
>> ip.src == 127.0.0.1

4、筛选从 127.0.0.1 到 127.0.0.2 的所有数据包
>> ip.src == 127.0.0.1 and ip.dst == 127.0.0.2

5、筛选源地址是 127.0.0.1 或者 127.0.0.2 的所有数据包
>> ip.src == 127.0.0.1 or ip.src == 127.0.0.2

6、筛选源地址是 127.0.0.1 且协议类型时 http（tcp） 的所有数据包
按协议类型筛选：http（tcp）
>> ip.src == 127.0.0.1 and http（tcp）

7、根据端口过滤固定源与目标：
ip.src == 192.168.0.2 and ip.dst == 192.168.0.233 and tcp.port == 965

8、根据包长过滤固定源与目标：
ip.src == 192.168.0.2 and ip.dst == 192.168.0.233 and tcp.len == 12

2.2 设置Wireshark tls
编辑 --> 首选项--> Protocols--> TLS

选择到tls 后将之前的sslkey.txt导入下。再使用下前面的过滤命令，正常情况下，现在就能正常看到了。(文案也是抄的我很抱歉)

布局不对这么设置

浏览器导入sslkey

chrome.exe --ssl-version-max=tls1.3  --ssl-key-log-file="./ssl_keys.txt"

参考内容

Wireshark Tutorial: Display Filter Expressions
https://unit42.paloaltonetworks.com/using-wireshark-display-filter-expressions/

HTTPS Traffic Without the Key Log File
https://unit42.paloaltonetworks.com/wireshark-tutorial-decrypting-https-traffic/
The First Few Milliseconds of an HTTPS Connection
http://www.moserware.com/2009/06/first-few-milliseconds-of-https.html
Sniffing HTTPS Traffic in Chromium with Wireshark
https://adw0rd.com/2020/12/2/chromium-https-ssl-tls-sniffing-with-wireshark/en/

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