前言#
這篇文章是我找了好久才在收藏夾裡面找到的。轉載自吾愛論壇：https://www.52pojie.cn/thread-1405917-1-1.html
準備工作#
- 已 root 的安卓手機 (貌似 ios 也不能 root 吧)
- frida 環境一套 (剛發現我竟然忘記寫 frida 教程了)
操作原理#
使用 tcpdump 去從系統層次去抓包，然後通過 firda 去 hook 需要抓包的 app，拿到 sslkey，然後利用 sslkey 去解密 tcpdump 抓到的包
操作原理#
tcpdump 的抓包方面#
1.1 手機中執行 tcpdump
tcpdump -i any -s 0 -w /sdcard/Download/capture.pcap
2.1 手機沒有 tcpdump 的
- 下載地址：https://www.androidtcpdump.com/android-tcpdump/downloads
- 如果遇到權限不夠的，先 push 到 sdcard/ 再移動過去
adb push tcpdump /data/local/tmp/
2.2 在手機中執行給權限
chmod 777 tcpdump
2.3 繼續執行 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 命令選項 更多關於 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 編寫 frida 腳本（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 運行此 frida 腳本
frida -U -f package -l ./sslkeyfilelog.js --no-pause
解密數據包部分#
1.1 導出 tcpdump 的日誌
將 /sdcard/Download/capture.pcap 保存到電腦即可
1.2 導出 frida 的日誌
手動複製粘貼，沒有什麼好辦法，將日誌保存到sslkey.txt文件裡
大概像下面這樣 (這樣式)，別掺雜別的就行
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 打開.pcap 文件 進入 Wireshark
// Wireshark快速過濾
(http.request or tls.handshake.type eq 1) and !(ssdp)
也可以像下面篩選常用數據流
1、篩選經過 127.0.0.1 主機的所有數據包
>> ip.addr == 127.0.0.1
2、篩選目的地址是 127.0.0.1 的所有數據包
>> ip.dst == 127.0.0.1
3、篩選源地址是 127.0.0.1 的所有數據包
>> ip.src == 127.0.0.1
4、篩選從 127.0.0.1 到 127.0.0.2 的所有數據包
>> ip.src == 127.0.0.1 and ip.dst == 127.0.0.2
5、篩選源地址是 127.0.0.1 或者 127.0.0.2 的所有數據包
>> ip.src == 127.0.0.1 or ip.src == 127.0.0.2
6、篩選源地址是 127.0.0.1 且協議類型時 http（tcp） 的所有數據包
按協議類型篩選：http（tcp）
>> ip.src == 127.0.0.1 and http（tcp）
7、根據端口過濾固定源與目標：
ip.src == 192.168.0.2 and ip.dst == 192.168.0.233 and tcp.port == 965
8、根據包長過濾固定源與目標：
ip.src == 192.168.0.2 and ip.dst == 192.168.0.233 and tcp.len == 12
2.2 設置 Wireshark tls
編輯 --> 首選項 --> Protocols--> TLS
選擇到 tls 後將之前的 sslkey.txt 導入下。 再使用下前面的過濾命令， 正常情況下， 現在就能正常看到了。(文案也是抄的我很抱歉)
佈局不對這麼設置#
瀏覽器導入 sslkey#
chrome.exe --ssl-version-max=tls1.3 --ssl-key-log-file="./ssl_keys.txt"
參考內容#
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/