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SSH Tunnel Through an Outbound SOCKS Proxy

Demonstrates reaching the SSH server through an outbound SOCKS proxy using the SocksVersion, SocksHostname, SocksPort, SocksUsername, and SocksPassword properties.

Background: This is the reverse direction from dynamic forwarding: here a SOCKS proxy is used to reach the SSH server, for networks where outbound connections must pass through one. SocksVersion is the switch — 0 means no SOCKS, while 4 or 5 selects the protocol. SOCKS5 supports username/password authentication and remote DNS; SOCKS4 supports only a username.

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Local $bSuccess = False

;  Demonstrates reaching the SSH server through an outbound SOCKS proxy using the SshTunnel
;  properties SocksVersion, SocksHostname, SocksPort, SocksUsername, and SocksPassword.

$oTunnel = ObjCreate("Chilkat.SshTunnel")

;  Set SocksVersion to 4 or 5 to route the outbound connection to the SSH server through a SOCKS
;  proxy.  A value of 0 (the default) means no SOCKS proxy.
$oTunnel.SocksVersion = 5
$oTunnel.SocksHostname = "socks.example.com"
$oTunnel.SocksPort = 1080

;  SOCKS4 supports only a username; SOCKS5 supports username and password.
$oTunnel.SocksUsername = "myProxyLogin"
$oTunnel.SocksPassword = "myProxyPassword"

$oTunnel.DestHostname = "db.internal.example.com"
$oTunnel.DestPort = 5432

;  Connect to the SSH server through the SOCKS proxy configured above.
Local $iSshPort = 22
$bSuccess = $oTunnel.Connect("ssh.example.com",$iSshPort)
If ($bSuccess = False) Then
    ConsoleWrite($oTunnel.LastErrorText & @CRLF)
    Exit
EndIf

;  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.
Local $sPassword = "mySshPassword"

$bSuccess = $oTunnel.AuthenticatePw("mySshLogin",$sPassword)
If ($bSuccess = False) Then
    ConsoleWrite($oTunnel.LastErrorText & @CRLF)
    Exit
EndIf

Local $iListenPort = 1080
$bSuccess = $oTunnel.BeginAccepting($iListenPort)
If ($bSuccess = False) Then
    ConsoleWrite($oTunnel.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("Tunnel established through the SOCKS proxy." & @CRLF)

Local $bWaitForThreadExit = True
$bSuccess = $oTunnel.CloseTunnel($bWaitForThreadExit)
If ($bSuccess = False) Then
    ConsoleWrite($oTunnel.LastErrorText & @CRLF)
    Exit
EndIf