vortielectro.blogg.se - Golang ssh tunnel

#GOLANG SSH TUNNEL CODE#
#GOLANG SSH TUNNEL PASSWORD#

SSH creates both interfaces automatically, but IP and routing should be configured after the connection is established. Once these files are created, enable them by restarting rvice.Īlso, you may manage tun interfaces with ip tunnel command. Group=network /etc/systemd/network/vpn.network See sshd_config(5) for details.Ĭreate tun interfaces using systemd-networkd /etc/systemd/network/vpn.netdev Setting yes enables forwarding for both point-to-point and ethernet tunnels. To enable forwarding for the TUN device, edit /etc/ssh/sshd_config and set PermitTunnel to yes, point-to-point or ethernet. It is also possible to create a layer 2/ethernet/TAP tunnel. Here, a layer 3/point-to-point/ TUN tunnel is described. OpenSSH has built-in TUN/TAP support using -w. Now all traffic (except for DNS and the SSH server itself) should go through tun0. # ip route add default via 10.0.0.2 metric 6 With all of that said, let us get to work: We also need a new default route with a lower metric than your old default route so that traffic goes into the tunnel at all. Apart from that, we need to set an explicit DNS route because tun2socks does not tunnel UDP (required for DNS). The idea behind setting the metrics specifically is because we need to ensure that the route picked to the SSH server is always direct because otherwise it would go back into the SSH tunnel which would cause a loop and we would lose the SSH connection as a result.

Default route for all other traffic with a higher metric than the other routes.

Route for DNS server (because tun2socks does not do UDP which is necessary for DNS) with a low metric.

Route that goes to the SSH server that we use for the tunnel with a low metric.

Let us set up a route that routes all traffic into it. Now you have a working local tun0 interface which routes all traffic going into it through the SOCKS proxy you set up earlier.Īll that's left to do now is to set up a local route to get some traffic into it. $ ssh -TND 4711 up badvpn and tunnel interfaceĪfterwards, we can go ahead with setting up the TUN. Get private key for ssh authenticationįunc parsePrivateKey(keyPath string) (ssh.Note: The badvpn project has been discontinued in August 2022, and the latest stable release is from April 2015.īadvpn is a collection of utilities for various VPN-related use cases.įirst, we will set up a normal SSH dynamic socks proxy like usual: Return os.Getenv("HOME") + "/.ssh/id_rsa"

#GOLANG SSH TUNNEL CODE#

Here's simplified code that does just that: package main

Accept local connections and forward data to the remote connection.Make connection to the target ip:port from SSH connection.

#GOLANG SSH TUNNEL PASSWORD#

Establish SSH connection with remote server user pubkey or password authentication.Implementing ssh port forwarding programmatically takes a few steps:

There's a "third-party" package crypto/ssh maintainedīy Google ( docs): go get /x/crypto/ssh Here's how you can start a standard psql console: psql standard library has plenty of packages, but unfortunately it does not provide Format: port:host:hostportĮxample above was modeled for usage with PostgreSQL.

-L - Specifies that the given port on the local (client) host is to be forwarded to the given host and port on the remote side.

-g - Allows remote hosts to connect to local forwarded ports.

To start forwarding ports you can use ssh command: ssh -Ng -L 5000:localhost:5432 will start server on localhost:5000 and forward connection to localhost:5432 Most likely you have a strict firewall rule in place that only allows connectsįrom a known IP addresses and a big chance that the only publicly exposed port If you're running your own database server, Is a common practice to make connections to services that could not be exposedĭirectly to the public internet.