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120 lines
3.2 KiB
Markdown
120 lines
3.2 KiB
Markdown
# 
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[![License][1]][2]
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[1]: https://img.shields.io/badge/License-MPL_2.0-brightgreen.svg
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[2]: LICENSE
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**[中文文档](README.zh.md)**
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OpenGFW is a flexible, easy-to-use, open source implementation of [GFW](https://en.wikipedia.org/wiki/Great_Firewall) on
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Linux that's in many ways more powerful than the real thing. It's cyber sovereignty you can have on a home router.
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> [!CAUTION]
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> This project is still in very early stages of development. Use at your own risk.
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> [!NOTE]
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> We are looking for contributors to help us with this project, especially implementing analyzers for more protocols!!!
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## Features
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- Full IP/TCP reassembly, various protocol analyzers
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- HTTP, TLS, DNS, SSH, SOCKS5, and many more to come
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- "Fully encrypted traffic" detection for Shadowsocks,
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etc. (https://gfw.report/publications/usenixsecurity23/data/paper/paper.pdf)
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- Trojan (proxy protocol) detection based on Trojan-killer (https://github.com/XTLS/Trojan-killer)
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- [WIP] Machine learning based traffic classification
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- Full IPv4 and IPv6 support
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- Flow-based multicore load balancing
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- Connection offloading
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- Powerful rule engine based on [expr](https://github.com/expr-lang/expr)
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- Flexible analyzer & modifier framework
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- Extensible IO implementation (only NFQueue for now)
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- [WIP] Web UI
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## Use cases
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- Ad blocking
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- Parental control
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- Malware protection
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- Abuse prevention for VPN/proxy services
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- Traffic analysis (log only mode)
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## Usage
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### Build
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```shell
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go build
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```
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### Run
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```shell
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export OPENGFW_LOG_LEVEL=debug
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./OpenGFW -c config.yaml rules.yaml
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```
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### Example config
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```yaml
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io:
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queueSize: 1024
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local: true # set to false if you want to run OpenGFW on FORWARD chain
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workers:
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count: 4
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queueSize: 16
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tcpMaxBufferedPagesTotal: 4096
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tcpMaxBufferedPagesPerConn: 64
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udpMaxStreams: 4096
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```
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### Example rules
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[Analyzer properties](docs/Analyzers.md)
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For syntax of the expression language, please refer
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to [Expr Language Definition](https://expr-lang.org/docs/language-definition).
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```yaml
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- name: block v2ex http
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action: block
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expr: string(http?.req?.headers?.host) endsWith "v2ex.com"
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- name: block v2ex https
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action: block
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expr: string(tls?.req?.sni) endsWith "v2ex.com"
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- name: block shadowsocks
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action: block
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expr: fet != nil && fet.yes
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- name: block trojan
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action: block
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expr: trojan != nil && trojan.yes
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- name: v2ex dns poisoning
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action: modify
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modifier:
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name: dns
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args:
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a: "0.0.0.0"
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aaaa: "::"
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expr: dns != nil && dns.qr && any(dns.questions, {.name endsWith "v2ex.com"})
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- name: block google.com:80 via SOCKS5
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action: block
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expr: string(socks5?.req?.addr) endsWith "google.com" && socks5?.req?.port == 80
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```
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#### Supported actions
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- `allow`: Allow the connection, no further processing.
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- `block`: Block the connection, no further processing. Send a TCP RST if it's a TCP connection.
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- `drop`: For UDP, drop the packet that triggered the rule, continue processing future packets in the same flow. For
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TCP, same as `block`.
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- `modify`: For UDP, modify the packet that triggered the rule using the given modifier, continue processing future
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packets in the same flow. For TCP, same as `allow`.
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