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Connect to an SSH Server Through Another (Jump Host)

Demonstrates the Chilkat Ssh.ConnectThroughSsh method, which connects to a second SSH server through an already connected and authenticated Ssh object. The first argument is the first (jump-host) Ssh object, and the second and third are the destination hostname and port.

Background: This is SSH chaining through a "jump host" (bastion): the application connects to a reachable gateway, then tunnels onward to a target that is only accessible from inside the network. Each hop is authenticated separately with its own credentials. The result is a normal Ssh object for the target that happens to be routed through the first connection.

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Local $bSuccess = False

;  Demonstrates the Ssh.ConnectThroughSsh method, which connects to a second SSH server through
;  an already connected and authenticated Ssh object (a jump host).  The 1st argument is the
;  first Ssh object, and the 2nd and 3rd are the destination hostname and port.

$oSshJump = ObjCreate("Chilkat.Ssh")

;  Connect and authenticate to the first SSH server (the jump host).
Local $iSshPort = 22
$bSuccess = $oSshJump.Connect("jump.example.com",$iSshPort)
If ($bSuccess = False) Then
    ConsoleWrite($oSshJump.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 = $oSshJump.AuthenticatePw("jumpUser",$sPassword)
If ($bSuccess = False) Then
    ConsoleWrite($oSshJump.LastErrorText & @CRLF)
    Exit
EndIf

;  Connect to the target SSH server through the jump host.
$oSshTarget = ObjCreate("Chilkat.Ssh")
$bSuccess = $oSshTarget.ConnectThroughSsh($oSshJump,"target.example.com",$iSshPort)
If ($bSuccess = False) Then
    ConsoleWrite($oSshTarget.LastErrorText & @CRLF)
    Exit
EndIf

;  Authenticate to the target server (separate credentials).
$bSuccess = $oSshTarget.AuthenticatePw("targetUser",$sPassword)
If ($bSuccess = False) Then
    ConsoleWrite($oSshTarget.LastErrorText & @CRLF)
    Exit
EndIf

ConsoleWrite("Connected to the target through the jump host." & @CRLF)

$oSshTarget.Disconnect 
$oSshJump.Disconnect