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。
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
| 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
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
