mitmproxy-grpc

As of now, mitmproxy only supports raw deserialization of protobuf data. mitmproxy_grpc.py is an addon that adds descriptor-based gRPC support to mitmproxy. It allows for both serialization and deserialization of protobuf data. The addon uses a descriptor file to resolve gRPC services, methods, and message types.

Usage

mitmproxy -s mitmproxy_grpc.py --set descriptor_file=pathToDescriptorFile

Obtaining a descriptor file

You can use the proto compiler to compile a descriptor file out of your proto files. See the descriptor_set_out option for more information.

Viewing content

Once in the single flow view, switch to google.protobuf content view. The output will be a deserialized JSON of protobuf content. Deserialization will only work if the gRPC and message definition are present in the descriptor file.

Editing content

Once in the single flow view, use the :grpc request_body or :grpc response_body option to edit the content. Serialization will only work if the gRPC and message definition are present in the descriptor file.

Limitations

• Compressed protobuf content is not supported.