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A TCP tunneling suite built with golang and gRPC. gTunnel can manage multiple forward and reverse tunnels that are all carried over a single TCP/HTTP2 connection. I wanted to learn a new language, so I picked go and gRPC. Client executables have been tested on windows and linux.
Dependencies
gTunnel has been tested with Docker version 19.03.6, but any version of docker should do.
How to use.
The start_server.sh script will build a docker image and start it with no exposed ports. If you plan on using forward tunnels, make sure to map those ports or to change the docker network.
./start_server.sh
This will eventually provide you with the following prompt:
___________ ____ ___ _______ _______ ___________.____
___ \__ ___/| | \\ \ \ \ \_ _____/| |
/ ___\ | | | | // | \ / | \ | __)_ | |
/ /_/ >| | | | // | \/ | \ | \| |___
\___ / |____| |______/ \____|__ /\____|__ //_______ /|_______ \
/_____/ \/ \/ \/ \/
>>> >>> configclient win 172.17.0.1 443 win-client>>> configclient linux 172.17.0.1 443 lclient
___________ ____ ___ _______ _______ ___________.____
___ \__ ___/| | \\ \ \ \ \_ _____/| |
/ ___\ | | | | // | \ / | \ | __)_ | |
/ /_/ >| | | | // | \/ | \ | \| |___
\___ / |____| |______/ \____|__ /\____|__ //_______ /|_______ \
/_____/ \/ \/ \/ \/
>>> configclient linux 127.0.0.1 443 test
>>> 2020/03/20 22:01:47 Endpoint connected: id: test
>>> >>> use test
(test) >>> addtunnel (local | remote) listenPort destinationIP destinationPort addtunnel local 4444 10.10.1.5 445 smbtunaddtunnel remote 666 192.168.1.10 443(test) >>> listtunnels
Tunnel ID: smbtun
Tunnel ID: dVck5Zba(test) >>> deltunnel smbtun
Deleting tunnel : smbtunsocks 1080
addtunnel local 1080 127.0.0.1 1080(test) >>> back
>>> (test) >>> disconnect
2020/03/20 22:14:52 Disconnecting test
(test) >>> 2020/03/20 22:14:52 Endpoint disconnected: test
>>> >>> disconnect test
2020/03/20 22:16:00 Disconnecting test
>>> 2020/03/20 22:16:00 Endpoint disconnected: test
>>> >>> exitTODO
[x] Reverse tunnel support
[x] Multiple tunnel support
[] Better print out support for tunnels. It should show how many connections are established and ports, etc.
[] Add REST API and implement web UI
[X] Dynamic socks proxy support.
[] Authentication between client and server
[] Server configuration file on input with pre-configured tunnels
Known Issues
- Intenet Explorer is causing the client to lock up on reverse tunnels
- The startup server script should reuse the built image, not create a new one every time.