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A simple and fast anti-censorship tool written in Go
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readme.md

SpoofDPI

Read in other Languages: English, 한국어

A simple and fast software designed to bypass Deep Packet Inspection

image

Dependencies

  • Go

Installation

  • You can install the latest binary with wget

    • MacOS
    $ wget -O - https://raw.githubusercontent.com/xvzc/SpoofDPI/main/install.sh | bash -s osx
    • Linux
    $ wget -O - https://raw.githubusercontent.com/xvzc/SpoofDPI/main/install.sh | bash -s linux

  • You can also install SpoofDPI with go install
    $ go install github.com/xvzc/SpoofDPI/cmd/spoof-dpi

    Remember that $GOPATH should be set in your $PATH

  • Or you can build your own
    $ git clone https://github.com/xvzc/SpoofDPI.git
    $ cd SpoofDPI
    $ go build ./cmd/...

Usage

Usage: spoof-dpi [options...]
--dns=<addr>   | default: 8.8.8.8
--port=<port>  | default: 8080
--debug=<bool> | default: false

If you are using any vpn extensions such as Hotspot Shield in Chrome browser,
go to Settings > Extensions, and disable them.

OSX

Run $ spoof-dpi and it will automatically set your proxy

Linux

Run $ spoof-dpi and open your favorite browser with proxy option
google-chrome --proxy-server="http://127.0.0.1:8080"

How it works

HTTP

Since most of websites in the world now support HTTPS, SpoofDPI doesn't bypass Deep Packet Inspections for HTTP requets, However It still serves proxy connection for all HTTP requests.

HTTPS

Although TLS 1.3 encrypts every handshake process, the domain names are still shown as plaintext in the Client hello packet. In other words, when someone else looks on the packet, they can easily guess where the packet is headed to. The domain name can offer a significant information while DPI is being processed, and we can actually see that the connection is blocked right after sending Client hello packet. I had tried some ways to bypass this, and found out that it seemed like only the first chunk gets inspected when we send the Client hello packet splited in chunks. What SpoofDPI does to bypass this is to send the first 1 byte of a request to the server, and then send the rest.

SpoofDPI doesn't decrypt your HTTPS requests, and that's why we don't need the SSL certificates.

Inspirations

Green Tunnel by @SadeghHayeri
GoodbyeDPI by @ValdikSS