Frida与Python调用传参

Frida RPC 与python相互传参示例

场景

登录验证： 手机输入账号密码后hook，修改为admin+密码 并md5

要实现的功能是，我们不仅仅可以在python上调用安卓app里的函数。我们还可以把数据从安卓app里传递到python主机上，在主机上进行修改，再传递回安卓app里面去。

android

package com.r0ysue.a0512demo04;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.util.Base64;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    EditText username_et;
    EditText password_et;
    TextView message_tv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        password_et = (EditText) this.findViewById(R.id.editText2);
        username_et = (EditText) this.findViewById(R.id.editText);
        message_tv = ((TextView) findViewById(R.id.textView));

        this.findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 如果账号为admin就不通过
                if (username_et.getText().toString().compareTo("admin") == 0) {
                    message_tv.setText("You cannot login as admin");
                    return;
                }
                //hook target
                message_tv.setText("Sending to the server :" + Base64.encodeToString((username_et.getText().toString() + ":" + password_et.getText().toString()).getBytes(), Base64.DEFAULT));

            }
        });

    }
}

JavaScript

Java.perform(function () {
    var tv_class = Java.use("android.widget.TextView");
    var string_class = Java.use("java.lang.String");
    tv_class.setText.overload("java.lang.CharSequence").implementation = function (x) {
        var string_to_send = x.toString();
        var string_to_recv;
        send(string_to_send); // 向python端发送信息
        recv(function (received_json_object) {
            string_to_recv = received_json_object.my_data
            console.log("string_to_recv: " + string_to_recv);
        }).wait(); // 等待回收 recv python端的信息
        var my_string = string_class.$new(string_to_recv);  // 转换为java的string
        return this.setText(my_string);
    }
});

Python

import time 
import frida
import base64

def my_message_handler(message, payload):
    print(message)
    print(payload)
    if message["type"] == "send":  // 接收 sokect
        print(message["payload"])
        data = message["payload"].split(":")[1].strip()
        print( 'message:', message)
        data = str(base64.b64decode(data))
        print( 'data:',data)
        user, pw = data.split(":")
        print( 'pw:',pw)
        data = str(base64.b64encode(("admin" + ":" + pw).encode()))
        print( "encoded data:", data)
        script.post({"my_data": data})  # send JSON object
        print( "Modified data sent")

device = frida.get_usb_device()
pid = device.spawn(["com.r0ysue.a0512demo04"])
device.resume(pid)
time.sleep(1)
session = device.attach(pid)
with open("0512demo04.js") as f:
    script = session.create_script(f.read())
script.on("message", my_message_handler) 
script.load()
input()

补充：layout

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">


    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="please input username and password"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />


    <EditText
        android:id="@+id/editText"
        android:hint="username"
        android:layout_width="fill_parent"
        android:layout_height="40dp"
        android:maxLength="20"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.095" />

    <EditText
        android:id="@+id/editText2"
        android:hint="password"
        android:layout_width="fill_parent"
        android:layout_height="40dp"
        android:maxLength="20"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.239" />

    <Button
        android:id="@+id/button"
        android:layout_width="100dp"
        android:layout_height="35dp"
        android:layout_gravity="right|center_horizontal"
        android:text="提交"
        android:visibility="visible"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.745" />

</androidx.constraintlayout.widget.ConstraintLayout>