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g3proxy

The g3proxy is an enterprise level forward proxy, but still with basic support for tcp streaming / tls streaming / transparent proxy / reverse proxy.

User Guide

中文 | English

Detailed Features

Server

Servers will handle connections from clients. There many types of servers can be used for different purpose.

The common features are:

  • Ingress network filter | Target Host filter | Target Port filter
  • Socket Speed Limit
  • Request Rate Limit | IDLE Check
  • Protocol Inspection | TLS/TLCP Interception | ICAP Adaptation
  • Various TCP & UDP socket config options
  • Rustls TLS Server
  • Openssl/BoringSSL/AWS-LC/Tongsuo TLS Server & Client
  • Tongsuo TLCP Server & Client (国密《GB/T 38636-2020》)

Forward Proxy Servers

  • Http(s) Proxy

    • TLS / mTLS
    • Http Forward | Https Forward | Http CONNECT | Ftp over HTTP
    • Basic User Authentication
    • Port Hiding

  • Socks Proxy

    • Socks4 Tcp Connect | Socks5 Tcp Connect | Socks5 UDP Associate
    • User Authentication
    • Client side UDP IP Binding / IP Map / Ranged Port

Transparent Proxy Servers

Reverse Proxy Servers

  • Http(s) Reverse Proxy
    • TLS / mTLS
    • Basic User Authentication
    • Port Hiding
    • Host based Routing

Streaming Servers

  • TCP Stream

    • Upstream TLS / mTLS
    • Load Balance: RR / Random / Rendezvous / Jump Hash

  • TLS Stream

    • mTLS
    • Upstream TLS / mTLS
    • Load Balance: RR / Random / Rendezvous / Jump Hash

Alias Port Servers

Alias port servers can be used to add extra ports to other servers.

  • Plain TCP Port
    • PROXY Protocol
  • Plain TLS Port
    • PROXY Protocol
    • mTLS
    • based on Rustls
  • Native TLS Port
    • PROXY Protocol
    • mTLS
    • based on OpenSSL/BoringSSL/AWS-LC/Tongsuo
  • Intelli Proxy Proxy
    • Multiple protocol: Http Proxy | Socks Proxy
    • PROXY Protocol

Escaper

Escapers are used to define the way to connect to upstream. There are many types of escapers.

The common features are:

  • Happy Eyeballs
  • Socket Speed Limit
  • Various TCP & UDP socket config options
  • IP Bind

Direct Connect Escapers

  • DirectFixed

    • TCP Connect | TLS Connect | HTTP(s) Forward | UDP Associate
    • Egress network filter
    • Resolve redirection
    • Index based Egress Path Selection

  • DirectFloat

    • TCP Connect | TLS Connect | HTTP(s) Forward | UDP Associate
    • Egress network filter
    • Resolve redirection
    • Dynamic IP Bind
    • Json based Egress Path Selection

Proxy Chaining Escapers

  • Http Proxy

    • TCP Connect | TLS Connect | HTTP(s) Forward
    • PROXY Protocol
    • Load Balance: RR / Random / Rendezvous / Jump Hash
    • Basic User Authentication

  • Https Proxy

    • TCP Connect | TLS Connect | HTTP(s) Forward
    • PROXY Protocol
    • Load Balance: RR / Random / Rendezvous / Jump Hash
    • Basic User Authentication
    • mTLS

  • Socks5(s) Proxy

    • TCP Connect | TLS Connect | HTTP(s) Forward | UDP Associate
    • Load Balance: RR / Random / Rendezvous / Jump Hash
    • Basic User Authentication

  • ProxyFloat

    • Dynamic Proxy: Http Proxy | Https Proxy | Socks5(s) Proxy
    • Json based Egress Path Selection

Router Escapers

Router escaper can be used to select the real escapers, based on different route rules.

  • route-client - based on client addresses
    • exact ip match
    • subnet match
  • route-mapping - based on user supplied rules in requests
    • Index based Egress Path Selection
  • route-query - based on queries to external agent
  • route-resolved - based on resolved IP of target host
  • route-geoip - based on GeoIP rules of the resolved IP
  • route-select - simple load balancer
    • RR / Random / Rendezvous / Jump Hash
    • Json based Egress Path Selection
  • route-upstream - based on original target host
    • exact ip match
    • exact domain match
    • wildcard domain match
    • subnet match
    • regex domain match
  • route-failover - failover between primary and standby escaper

Other Helper Escapers

  • comply-audit - overwrite server side auditor settings

Resolver

  • c-ares
    • UDP
    • TCP
  • hickory
    • UDP / TCP
    • DNS over TLS
    • DNS over HTTPS
    • DNS over HTTP/3
    • DNS over QUIC
  • fail-over

Auth

Auth Method

  • HTTP Basic Auth
  • Socks5 User Auth
  • Anonymous user

User Features

  • ACL: Proxy Request | Target Host | Target Port | User Agent
  • Socket Speed Limit | Process Level Global Speed Limit
  • Request Rate Limit | Request Alive Limit | IDLE Check
  • Auto Expire | Block
  • Json based Egress Path Selection

User Site Features

It's also possible to set different site config for each user:

  • Match by Exact IP | Exact Domain | Wildcard Domain | Subnet
  • Request | Client Traffic | Remote Traffic Metrics
  • Task Duration Histogram Metrics
  • Custom TLS Client Config

Audit

  • TCP Protocol Inspection
  • Task Level Sampling
  • TLS/TLCP Interception
  • External Certificate Generator
  • TLS/TLCP Decrypted Stream Dump
  • Stream Detour for connection based protocols
  • Http1 & Http2 Interception
  • IMAP & SMTP Interception
  • ICAP Adaptation, support HTTP1/HTTP2/IMAP/SMTP

Logging

  • Log Types

    • Server: task log
    • Escaper: escape error log
    • Resolver: resolve error log
    • Audit: inspect & intercept log

  • Backend Protocol

    • journald
    • syslog
    • fluentd

Metrics

  • Metrics Types

    • Server level metrics
    • Escaper level metrics
    • User level metrics
    • User-Site level metrics
    • Resolver metrics
    • Runtime metrics
    • Log metrics

  • Backend Protocol

    • StatsD, so it's possible to use StatsD implementations to redistribute metrics to many other TSDBs

Documents

The detailed docs are resided in the doc directory.

Examples

You can find example config in the examples directory.