wadahiro/go-transproxy: Transparent proxy servers for HTTP, HTTPS, DNS and TCP.

Transparent proxy servers for HTTP, HTTPS, DNS and TCP. This repository is heavily under development.

Description

go-transproxy provides transparent proxy servers for HTTP, HTTPS, DNS and TCP with single binary. Nothing needs to setup many tools. Nothing needs to configure iptables. go-transproxy will start multiple proxy servers for these protocols. Futheremore, it will configure iptables automatically.

go-transproxy also provides two types of explicit proxy(not transparent proxy). One is a simple proxy delegating to upstream your proxy, another is for adding Proxy-Authorization header automatically.

Requirement

go-transproxy supports only Linux iptables.

Install

Binaly install

Download from Releases page.

Source install

Use Go 1.13 for the build.

make

Usage

Usage:

  transproxy [options]

Options:

  -disable-iptables
    	Disable automatic iptables configuration
  -dns-over-https-enabled
        Use DNS-over-HTTPS service as public DNS
  -dns-over-https-endpoint string
        DNS-over-HTTPS endpoint URL (default "https://dns.google.com/resolve")
  -dns-over-tcp-disabled
        Disable DNS-over-TCP for querying to public DNS
  -dns-proxy-listen [host]:port
        DNS Proxy listen address, as [host]:port (default ":3131")
  -dns-tcp
        DNS Listen on TCP (default true)
  -dns-udp
        DNS Listen on UDP (default true)
  -explicit-proxy-listen [host]:port
        Explicit Proxy listen address for HTTP/HTTPS, as [host]:port Note: This proxy doesn't use authentication info of the `http_proxy` and `https_proxy` environment variables (default ":3132")
  -explicit-proxy-only
        Boot Explicit Proxies only
  -explicit-proxy-with-auth-listen [host]:port
        Explicit Proxy with auth listen address for HTTP/HTTPS, as [host]:port Note: This proxy uses authentication info of the `http_proxy` and `https_proxy` environment variables (default ":3133")
  -http-proxy-listen [host]:port
        HTTP Proxy listen address, as [host]:port (default ":3129")
  -https-proxy-listen [host]:port
        HTTPS Proxy listen address, as [host]:port (default ":3130")
  -loglevel string
        Log level, one of: debug, info, warn, error, fatal, panic (default "info")
  -private-dns string
        Private DNS address for no_proxy targets (IP[:port])
  -public-dns string
        Public DNS address (IP[:port]) Note: Your proxy needs to support CONNECT method to the Public DNS port, and the public DNS needs to support TCP
  -tcp-proxy-dports port1,port2,...
        TCP Proxy dports, as port1,port2,... (default "22")
  -tcp-proxy-listen [host]:port
        TCP Proxy listen address, as [host]:port (default ":3128")

Proxy configuration is used from standard environment variables, http_proxy, https_proxy and no_proxy. Also you can use IP Address, CIDR, Suffix Domain Name in no_proxy.

Example

# Set your proxy environment
export http_proxy=http://foo:[email protected]:3128

# Set no_proxy if you need to access directly for internal
export no_proxy=example.org,192.168.0.0/24

# Start go-transproxy with admin privileges(sudo)
sudo -E transproxy -private-dns 192.168.0.100 -public-dns 8.8.8.8

For testing, using docker is easy way. Now, you can access to google from docker container with no proxy configuration as follows.

docker run --rm -it centos curl http://www.google.com
<HTML><HEAD><meta http-equiv="content-type" content="text/html;charset=utf-8">
<TITLE>302 Moved</TITLE></HEAD><BODY>
<H1>302 Moved</H1>
The document has moved
<A HREF="http://www.google.co.jp/?gfe_rd=cr&amp;dcr=0&amp;ei=GCKtWbD0AaLEXuTmr7gK">here</A>.
</BODY></HTML>

If your proxy doesn't support CONNECT method to DNS port, it cannot resolve public domain name transparently. Fortunately, Google privides DNS-over-HTTPS service, so you can use this service as public DNS by adding -dns-over-https-enabled option instead of -public-dns option as below even if your proxy supports CONNECT method to 443 port only.

sudo -E transproxy -private-dns 192.168.0.100 -dns-over-https-enabled

If you can resolve all domains directly from local LAN, run command without dns related options as below. It disables DNS-Proxy.

sudo -E transproxy

If you need to use both public DNS and private DNS, and need to use public DNS directly, run command with -dns-over-tcp-disabled option as below. It suppresses to insert a iptables OUTPUT rule for DNS over TCP.

sudo -E transproxy -private-dns 192.168.0.100 -public-dns 172.16.0.1 -dns-over-tcp-disabled

If you want to use an application which access to internet using port 5000, run command with -tcp-proxy-dports option as below.

sudo -E transproxy -private-dns 192.168.0.100 -public-dns 8.8.8.8 -tcp-proxy-dports 22,5000

Current Limitation

HTTP proxy: Only works with HTTP host header.
HTTPS proxy: no_proxy only works with IP Address and CIDR if your https client doesn't support SNI.
TCP proxy: no_proxy only works with IP Address and CIDR.

Licence

Licensed under the MIT license.

Author

Hiroyuki Wada