Write apps for android in python code

He also likes retro technology, classic cars and in his spare time enjoys traveling.

Write apps for android in python code

This post focusses on the aspect of dynamically modifying the behavior of the app on runtime using a tool called Frida.

Pentesting Android Apps Using Frida - NotSoSecure

Modifying the behavior of an Android application is desirable in instances where certain sensitive functionalities in app like Fingerprint Authentication is disabled or not allowed to run on rooted phones or you wish to bypass a Login screen or disable the SSL certificate pinning to intercept the traffic.

Traditionally, if anybody wishes to modify a particular functionality they need to use one of the below methods Edit the decompiled smali files and repackage it which is a daunting task as at times it becomes difficult to understand the decompiled code especially for newbies.

Xposed Framework — This is a more common approach used by pentesters today wherein you have to rewrite the functionality in a different app and relaunch the app In contrast to the above two approaches, Frida can be used to hook into the running process of the application and modify the code on the fly without requiring any re-launching or re-packaging.

Before we start with the setup, ensure that you have a proper working android, python environment and a rooted android phone with ARM architecture. Frida is currently supporting only ARM architectures. Setting up Frida Frida consists of two components, viz. The client can be installed by simply firing our favourite pip command as shown below.

Ensure you run the below command with either sudo or on an command shell running with administrator privileges. Modify the permissions for the frida-server binary using the command below and run as shown below chmod frida-server Now, on your desktop, fire the below command and test the connection with the frida-server frida-ps -aU If everything works fineyou should be having the output as shown in the image below.

The output basically shows all the injectable processes currently running. Open the Sieve app in your android phone. If the boolean value is true, the application redirects the flow to loginSuccessful function if false then to loginFailed.

Frida has support for binding with multiple languages like Python,C. However, we are using python to demonstrate the bypass. The same can be downloaded from here. Its worthwhile to understand what Frida is actually doing through this little piece of code.

Here, we are not modifying the function but we have control over what is being passed and what is being returned from the function. Lines are used to attach to our target process which we found through the frida-ps -aU command. The codewhich needs to be executed in process through Frida is written in javascript is from line Start the application on device and then execute the python script.

Using the below script, it is possible to bruteforce this pin and then gain access to the application. The script can be downloaded from here. Bypassing Root Detection Bypassing root detection is one of the most important use case in any Android application test.

Applications check for a rooted device during installation or for restricting use of certain sensitive functionalities like fingerprint authentication. Root detection is achieved by checking for installation of most common APKs like SuperSu which govern the root privileges or by attempting to write into the protected directories of the android file system like root.

To bypass these root detection techniques you would have to decompile the APK, edit the smali files and then repackage it by patching the methods which are implemented for root detection. The code is available here.

write apps for android in python code

Once Sign In button is pressed, the PostLogin Activity is initiated and the root detection logic is called. However, since Frida is using our JS code, it bypasses the detection successfully as shown below. What more can you do with Frida? There are multiple tools for pentesting which are built on top of Frida which can be used during your security assessment.

Two such tools are described below Fridump — A python script which utilised Frida to dump the memory of a particular process running on the device Appmon — An application running on the android device at times makes use of certain System level APIs for certain functionality.Scripting Layer For Android is the main Android Application you need to be able to run your Python applications on Android, so first you need to install SL4A on either your Android emulator or on the real Android device in case if you are going to do the development directly on your device.

An introduction to Python on Android - Android Authority

There are two primary integrated development environments (IDE) for Android. An IDE is the main program where you'll write code and put your app together. Introduction to Frida.


In this blog post, Rohit Salecha guides newbie pentesters on how to use Frida to audit Android applications for security vulnerabilities.

No android application review goes without performing reverse engineering of the app to find out what’s actually running in the background.

Jul 23,  · QPython is a script engine that runs Python on android devices. It lets your android device run Python scripts and projects. It contains the Python /5(K).

You write your code in tinypy (which is restricted Python), then use tinypy to convert it to C++, and finally compile this with XCode into a native iPhone app.

Using Implicit Intents

Phil Hassey has published a game called Elephants! using this approach. Scripting Layer For Android is the main Android Application you need to be able to run your Python applications on Android, so first you need to install SL4A on either your Android emulator or on the real Android device in case if you are going to do the development directly on your device.

Developing Android Apps completely in Python · PyCon Nove · Firenze, Aprile