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biemster / gasr

Google Chrome SODA Offline Speech Recognition command line client
https://hackaday.io/project/164399-android-offline-speech-recognition-natively-on-pc
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SODA.dll #7

Closed ElijahHamilton closed 3 years ago

ElijahHamilton commented 3 years ago

Hi! Is it possible you could email me the patched dll? I do not have a good understanding of patching binaries. Any response is appreciated!

elijah.w.hamilton@gmail.com

biemster commented 3 years ago

Fortunately it's not very difficult, and actually quite fun and educational:

  1. Download Ghidra and analyze the DLL (there are plenty tutorials online for this, search for CTF cracking challenges)
  2. Follow the entrypoint (the function that is called in the python / C client from this repo), until you get to three function calls that look like an API key check and a call stack verification (doing this first on the linux library helps a lot, since Ghidra can obtain the function names in this case)
  3. use a technique like a NOP slide to bypass those checks