SSH Through a SOCKS Proxy

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Demonstrates connecting to an SSH server through a SOCKS4 or SOCKS5 proxy. Set the SOCKS properties before calling Connect, and set SocksVersion to match the proxy server.

Background: SOCKS is a general-purpose TCP relay, so unlike an HTTP proxy it is designed from the start to carry arbitrary protocols — usually the smoother option for SSH. The version matters: SOCKS4 supports only a username with no password, while SOCKS5 supports full login/password authentication as well as IPv6 and remote DNS resolution. Note this is the inverse of dynamic port forwarding: here a SOCKS proxy is used to reach the SSH server, rather than SSH providing a SOCKS proxy.

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bool success = false;

//  This example requires the Chilkat API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

//  Demonstrates connecting to an SSH server through a SOCKS4 or SOCKS5 proxy.

Chilkat.Ssh ssh = new Chilkat.Ssh();

//  Set the SOCKS proxy properties before connecting.  The hostname may be a domain name or an
//  IP address.
ssh.SocksHostname = "socks.example.com";
ssh.SocksPort = 1080;
ssh.SocksUsername = "mySocksLogin";
ssh.SocksPassword = "mySocksPassword";

//  Set the version to match the proxy server: 4 or 5.
//  Note: SOCKS4 supports only a username, with no password.  SOCKS5 supports full
//  login/password authentication.
ssh.SocksVersion = 5;

string hostname = "ssh.example.com";
int port = 22;
success = ssh.Connect(hostname,port);
if (success == false) {
    Debug.WriteLine(ssh.LastErrorText);
    return;
}

Debug.WriteLine("Connected to the SSH server through the SOCKS proxy.");

//  Normally you would not hard-code the password in source.  You should instead obtain it
//  from an interactive prompt, environment variable, or a secrets vault.
string password = "mySshPassword";

success = ssh.AuthenticatePw("mySshLogin",password);
if (success == false) {
    Debug.WriteLine(ssh.LastErrorText);
    return;
}

//  ... use the SSH connection normally ...

ssh.Disconnect();