dex2jar
react-native-new-architecture
dex2jar | react-native-new-architecture | |
---|---|---|
5 | 8 | |
11,875 | 1,187 | |
- | 21.6% | |
5.0 | 6.4 | |
23 days ago | 2 days ago | |
Java | ||
Apache License 2.0 | - |
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dex2jar
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Understanding security in React Native applications
App tampering and repackaging can be performed by using reverse engineering or tampering tools, such as Apktool, dex2jar, etc.
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What Happens When Your Phone Is Spying on You
A week ago I purchased a bluetooth device that takes some measurements. You require an Android or iOS application. The first thing the iOS app did was request permission for your location. Immediate fired up MITMproxy [1] running in transparent `--mode wireguard` and installed it's certificate in the iOS trust store. It was sending a whole bunch of data to China and HK. Since I don't have a jailbroken iPhone, it's off to Android.
For BLE scanning, Android does require permissions for location, but this application is using a Chinese branded tracking SDK and sending encrypted (within already encrypted TLS). So it's time to start reversing and instrumenting the runtime.
Well - not so easy, they used a commercial packer that encrypts their compiled bytecode and decrypts and runs it within a C++ library. I managed to bull the Dalvik out of memory using Frida[2], covert it to java bytecode with dex2jar[3] then into decompiled java with jadx [3].
Since the developer relied on the packer to hide/obfuscate their software, it's quite easy to follow. The libraries that do the location tracking on the otherhand are obfuscated so now I'm at the stage of identifying where to hook before the encrypted blobs are sent to servers in China.
I've sunk about 8 hours into this so far. The message here is that to understand what some applications on your phone does you need to really invest time and effort. The developers increase the cost to the consumer to know what their application is doing by obfuscation, encryption and packing. It's asymmetric.
[1] https://mitmproxy.org/posts/wireguard-mode/
[2] https://frida.re/docs/android/
[3] https://github.com/skylot/jadx
[3] https://github.com/pxb1988/dex2jar
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Reverse Engineering Tools in 2022
I think they forgot to google translate the disadvantages of JEB Decompiler
I haven't used JEB to comment, but I've gotten a lot of mileage out of https://github.com/pxb1988/dex2jar#readme and then feed the normal Java jars it produces into https://github.com/mstrobel/procyon#readme and (of course) one shouldn't overlook picking your favorite tool for dealing with AndroidManifest.xml which often has fun things hiding in it
While digging up those links, I was reminded that some folks enjoy https://github.com/Konloch/bytecode-viewer#is-there-a-demo because it can be easier to "try out" a few of the decompilation engines, but I don't use it because it's hard to do batch things with it, versus dex2jar into procyon is automation friendly
- The Code the FBI Used to Wiretap the World
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Decompilers for android
Take a look at apktool: https://ibotpeaches.github.io/Apktool/ and dex2jar: https://github.com/pxb1988/dex2jar
react-native-new-architecture
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Understanding security in React Native applications
TurboModules: TurboModules are a new way of implementing native modules that use JSI instead of the bridge. TurboModules can reduce the overhead and latency of the native module calls, as well as provide a more consistent and type-safe interface for the JavaScript code. It is important to note that TurboModules are still experimental and not fully supported by all platforms and libraries
- The New Architecture Performance Benchmarks
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React Native 0.72 RC1 is here!
Finally, still about 0.72 RC1: Samuel Susla just made a post on performance benchmarking with some sweet new architecture 📈 measured on this RC. Check it out here 👉 https://github.com/reactwg/react-native-new-architecture/discussions/123
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If I migrate my app to the New Architecture (NA) what happens to the libraries that aren't compatible/updated to NA?
Also I can see on the GitHub a list of libraries that are migrated/migrating/plan to migrate here, https://github.com/reactwg/react-native-new-architecture/discussions/6. Is this really all the libraries that are compatible at this moment in time?
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RN 0.71 makes significant improvements in build time and consumed space
Detailed info - https://github.com/reactwg/react-native-new-architecture/discussions/105
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Clarifying library migrations for the new architecture
[The discussion in the working group about libraries adopting the new architecture](https://github.com/reactwg/react-native-new-architecture/discussions/6) implies an urgency that not updated libraries will block the migration to the new architecture but I was wondering in what way exactly.
- Doubts regarding the new architecture
- Workgroup for the new React Native architecture
What are some alternatives?
Apktool - A tool for reverse engineering Android apk files
RNNewArchitectureApp - A collection of sample React Native Apps that will show you how to use the New Architecture (Fabric & TurboModules) step-by-step.
comm - Comm is the working name of this open source messaging project.
react-native - A framework for building native applications using React
vineflower - Modern Java decompiler aiming to be as accurate as possible, with an emphasis on output quality. Fork of the Fernflower decompiler.
react-native-mmkv - ⚡️ The fastest key/value storage for React Native. ~30x faster than AsyncStorage!
ricochet - Anonymous peer-to-peer instant messaging
Welcome - Welcome to AeroRust- a Rust 🦀 in Aerospace 🚀 community & working group
Recaf - The modern Java bytecode editor
Free-RASP-ReactNative - React Native plugin for improving app security and threat monitoring on Android and iOS mobile devices.
procyon - Procyon java decompiler - Procyon is a binary star system in Canis Minor
bytecode-viewer - A Java 8+ Jar & Android APK Reverse Engineering Suite (Decompiler, Editor, Debugger & More)