Python Protocol Buffers Fuzzer, based on https://www.fuzzingbook.org/html/GrammarFuzzer.html. It automatically creates a grammar from .proto files and constructs a random derivation tree, denoting sections where it is possible to inject the payload. By default the runner uses HTTP requests, but the transport could be easily adjusted.

sudo apt install protoc
virtualenv -p /usr/bin/python3.7 venv
. venv/bin/activate
pip install -r requirements.txt

cp config.py.default config.py
vim config.py # edit the 'services', 'replace' and 'delete' variables
vim fuzzer.py # edit the 'inject_' methods
vim ppfuzz.py # edit the number of invocations

mkdir proto # store your .proto files referenced from the config here
./ppfuzz.py -C # generate the proto_out files

./ppfuzz.py # fuzzer

./probe.py # to replay some message, see the usage

MIT License

Copyright (c) 2019 Norbert Szetei

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.