lutter的证书校验
起因：
最近工作上让做个app的复测，把apk发我后，开始尝试挂代理抓包，结果发现抓不到
为是证书没弄好，想着前几天不是刚导入了吗（雾）。又重新导入了下还是不行。然后各种lsp模块，objection都不行，r0capture也没数据。
然后jadx看了下，全是flutter字样，才想起来和flutter有关。
开始百度（：
然后就开始各种找。
session_verify_cert_chain函数在第356行的ssl_x509.cc中被定义
然后根据原创一种基于frida和drony的针对flutter抓包的方法-Android安全-看雪-安全社区|安全招聘|kanxue.com 这篇文章特征找，但是这个是32位的，所以在app安装的时候指定32位安装
写脚本绕过
32位
|-------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | function hook_ssl_verify_result(address) { Interceptor.attach(address, { ``onEnter: function(args) { ``console.log(``"Disabling SSL validation"``) ``}, ``onLeave: function(retval) { ``console.log(``"Retval: " + retval); ``retval.replace(``0x1``); ``} ``}); } function hookFlutter() { ``var m ``= Process.findModuleByName(``"libflutter.so"``); ``var pattern ``= "2D E9 F0 4F 85 B0 06 46 50 20 10 70"``; ``var res ``= Memory.scan(m.base, m.size, pattern, { ``onMatch: function(address, size){ ``console.log(``'[+] ssl_verify_result found at: ' + address.toString()); ``/``/ Add ``0x01 because it's a THUMB function ``/``/ Otherwise, we would get ``'Error: unable to intercept function at 0x9906f8ac; please file a bug' ``hook_ssl_verify_result(address.add(``0x01``)); ``}, ``onError: function(reason){ ``console.log(``'[!] There was an error scanning memory'``); ``}, ``onComplete: function() { ``console.log(``"All done"``) ``} ``}); } |
然后启动就可以抓包了
64位
搜索ssl_client
然后就找到了这些
|-------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 1 2 3 4 5 6 7 8 9 | .text:``0000000000596870 FF C3 ``01 D1 SUB SP, SP, ``#0x70 .text:``0000000000596874 FD ``7B 01 A9 STP X29, X30, [SP,``#0x70+var_60] .text:``0000000000596878 FC ``6F 02 A9 STP X28, X27, [SP,``#0x70+var_50] .text:``000000000059687C FA ``67 03 A9 STP X26, X25, [SP,``#0x70+var_40] .text:``0000000000596880 F8 ``5F 04 A9 STP X24, X23, [SP,``#0x70+var_30] .text:``0000000000596884 F6 ``57 05 A9 STP X22, X21, [SP,``#0x70+var_20] .text:``0000000000596888 F4 ``4F 06 A9 STP X20, X19, [SP,``#0x70+var_10] .text:``000000000059688C 08 0A 80 52 MOV W8, ``#0x50 .text:``0000000000596890 48 00 00 39 STRB W8, [X2] |
然后写脚本
|-------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | function hook_ssl_verify_result(address) { Interceptor.attach(address, { ``onEnter: function(args) { ``console.log(``"Disabling SSL validation"``) ``}, ``onLeave: function(retval) { ``console.log(``"Retval: " + retval); ``retval.replace(``0x1``); ``} ``}); } function hookFlutter() { ``var m ``= Process.findModuleByName(``"libflutter.so"``); ``var pattern ``= "FF C3 01 D1 FD 7B 01 A9 FC 6F 02 A9FA 67 03 A9 F8 5F 04 A9 F6 57 05 A9 F4 4F 06 A9 08 0A 80 52 48 00 00 39"``; ``var res ``= Memory.scan(m.base, m.size, pattern, { ``onMatch: function(address, size){ ``console.log(``'[+] ssl_verify_result found at: ' + address.toString()); ``/``/ Add ``0x01 because it's a THUMB function ``/``/ Otherwise, we would get ``'Error: unable to intercept function at 0x9906f8ac; please file a bug' ``hook_ssl_verify_result(address.add(``0x01``)); ``}, ``onError: function(reason){ ``console.log(``'[!] There was an error scanning memory'``); ``}, ``onComplete: function() { ``console.log(``"All done"``) ``} ``}); } |
然后发现报错了
