revsocks

Reverse socks5 tunneler with SSL/TLS and proxy support (without proxy authentication and with basic/NTLM proxy authentication) Based on https://github.com/brimstone/rsocks and https://github.com/llkat/rsockstun

Features

Single executable (thanks to Go!)
Linux/Windows/Mac/BSD support
Encrypted communication with TLS
DNS tunneling support (SOCKS5 over DNS)
Support for proxies (without authentication or with basic/NTLM proxy authentication)
Automatic SSL/TLS certificate generation if not specified

Architecture

server = locally listening socks server
client = client which connects back to server

Usage

reverse TCP

Usage:
1) Start on VPS: revsocks -listen :8443 -socks 127.0.0.1:1080 -pass SuperSecretPassword
2) Start on client: revsocks -connect clientIP:8443 -pass SuperSecretPassword
3) Connect to 127.0.0.1:1080 on the VPS with any socks5 client.
4) Enjoy. :]

DNS tunnel

0) setup your domain records
1) Start on the DNS server: revsocks -dns example.com -dnslisten :53 -socks 127.0.0.1:1080 -pass 52fdfc072182654f163f5f0f9a621d729566c74d10037c4d7bbb0407d1e2c64
2) Start on the target: revsocks -dns example.com -pass 52fdfc072182654f163f5f0f9a621d729566c74d10037c4d7bbb0407d1e2c64
3) Connect to 127.0.0.1:1080 on the DNS server with any socks5 client.

Useful parameters

Add params:
 -proxy 1.2.3.4:3128 - connect via proxy
 -proxyauth Domain/username:password  - proxy creds
 -proxytimeout 2000 - server and clients will wait for 2000 msec for proxy connections... (Sometime it should be up to 4000...)
 -useragent "Internet Explorer 9.99" - User-Agent used in proxy connection (sometimes it is usefull)
 -pass Password12345 - challenge password between client and server (if not match - server reply 301 redirect)
 -recn - reconnect times number. Default is 3. If 0 - infinite reconnection
 -rect - time delay in secs between reconnection attempts. Default is 30

Options

Complete list of command line options

  -cert string
    	certificate file
  -connect string
    	connect address:port
  -debug
    	display debug info
  -dns string
    	DNS domain to use for DNS tunneling
  -dnsdelay string
    	Delay/sleep time between requests (200ms by default)
  -dnslisten string
    	Where should DNS server listen
  -listen string
    	listen port for receiver address:port
  -pass string
    	Connect password
  -proxy string
    	proxy address:port
  -proxyauth string
    	proxy auth Domain/user:Password
  -proxytimeout string
    	proxy response timeout (ms)
  -q	Be quiet
  -recn int
    	reconnection limit (default 3)
  -rect int
    	reconnection delay (default 30)
  -socks string
    	socks address:port (default "127.0.0.1:1080")
  -useragent string
    	User-Agent
  -verify
    	verify TLS connection
  -version
    	version information

Requirements

Go 1.4 or higher
Few external Go modules (yamux, go-socks5 and go-ntlmssp)

Compile and Installation

Linux VPS

install Golang: apt install golang make

make

launch:

./revsocks -listen :8443 -socks 127.0.0.1:1080 -pass Password1234

Windows client:

download and install golang

go get
go build

Windows optional

optional: to build as Windows GUI:

go build -ldflags -H=windowsgui

You can also compress exe - just use any exe packer, ex: UPX

upx revsocks

Usage examples

revsocks -connect clientIP:8443 -pass Password1234

or with proxy and user agent:

revsocks -connect clientIP:8443 -pass Password1234 -proxy proxy.domain.local:3128 -proxyauth Domain/userpame:userpass -useragent "Mozilla 5.0/IE Windows 10"

Client connects to server and send agentpassword to authorize on server. If server does not receive agentpassword or reveive wrong pass from client (for example if spider or client browser connects to server ) then it send HTTP 301 redirect code to www.microsoft.com

Custom certificate

Generate self-signed certificate with openssl:

openssl req -new -x509 -keyout server.key -out server.crt -days 365 -nodes

Debug

For debugging (especially DNS part):

go build -tags debug

kost/revsocks

kost

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