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JusticeRage / Gepetto

IDA plugin which queries uses language models to speed up reverse-engineering
GNU General Public License v3.0
2.77k stars 254 forks source link
gpt-35-turbo gpt-4-turbo ida-pro openai python reverse-engineering

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Gepetto

Gepetto is a Python script which uses various large language models to provide meaning to functions decompiled by IDA Pro. At the moment, it can ask them to explain what a function does, and to automatically rename its variables. Here is a simple example of what results it can provide in mere seconds:

Setup

Simply drop this script (gepetto.py, as well as the gepetto/ folder) into your IDA plugins folder ($IDAUSR/plugins). By default, on Windows, this should be %AppData%\Hex-Rays\IDA Pro\plugins (you may need to create it).

You will need to add the required packages to IDA's Python installation for the script to work. Find which interpreter IDA is using by checking the following registry key: Computer\HKEY_CURRENT_USER\Software\Hex-Rays\IDA (default on Windows: %LOCALAPPDATA%\Programs\Python\Python39). Finally, with the corresponding interpreter, simply run: 

[/path/to/python] -m pip install -r requirements.txt

⚠️ You will also need to edit the configuration file (found as gepetto/config.ini) and add your own API keys. For OpenAI, it can be found on this page. Please note that API queries are usually not free (although not very expensive) and you will need to set up a payment method with the corresponding provider.

Supported models

Adding support for additional models shouldn't be too difficult, provided whatever provider you're considering exposes an API similar to OpenAI's. Look into the gepetto/models folder for inspiration, or open an issue if you can't figure it out. Also make sure you edit ida/ui.py to add the relevant menu entries for your addition.

Usage

Once the plugin is installed properly, you should be able to invoke it from the context menu of IDA's pseudocode window, as shown in the screenshot below:

Switch between models supported by Gepetto from the Edit > Gepetto menu:

You can also use the following hotkeys:

Initial testing shows that asking for better names works better if you ask for an explanation of the function first – I assume because the model then uses its own comment to make more accurate suggestions. There is an element of randomness to the AI's replies. If for some reason the initial response you get doesn't suit you, you can always run the command again.

Limitations

Translations

You can change Gepetto's language by editing the locale in the configuration. For instance, to use the plugin in French, you would simply add:

[Gepetto]
LANGUAGE = "fr_FR"

The chosen locale must match the folder names in gepetto/locales. If the desired language isn't available, you can contribute to the project by adding it yourself! Create a new folder for the desired locale (ex: gepetto/locales/de_DE/LC_MESSAGES/), and open a new pull request with the updated .po file, which you can create by copying and editing gepetto/locales/gepetto.pot (replace all the lines starting with msgstr with the localized version).

Acknowledgements