PowerShell

SSH Through a SOCKS Proxy

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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Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$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.

$ssh = New-Object 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

$hostname = "ssh.example.com"
$port = 22
$success = $ssh.Connect($hostname,$port)
if ($success -eq $false) {
    $($ssh.LastErrorText)
    exit
}

$("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.
$password = "mySshPassword"

$success = $ssh.AuthenticatePw("mySshLogin",$password)
if ($success -eq $false) {
    $($ssh.LastErrorText)
    exit
}

#  ... use the SSH connection normally ...

$ssh.Disconnect()